Belt Conveyor Speed Adaptation Problem

#thebelt #beltonveyor #rubberbeltconveyor #rubbermovableconveyor

 At present, one viewpoint is advantageous when the belt conveyor is operated with a belt speed adjustable state. This paper will quote the problems in the speed adjustment of belt conveyors, which are recognized as the research results. The influence of speed control on the life of various parts of the belt conveyor, whether the material filling rate has energy saving effect, the relationship between the running speed of the conveyor and the drag coefficient The vibration of the drive unit indicates that the speed regulation is unfavorable.

1. General view of speed control of belt conveyor

Generally, the speed control of the belt conveyor is mainly for the start-up process of the conveyor, and the purpose is to reduce the dynamic load of the belt conveyor system, and the belt conveyor runs at a constant speed after the start of the belt conveyor. The purpose of controlling the belt speed during normal operation of the belt conveyor is to ensure that the average material fill rate is always kept at a maximum. If the conveyor speed is constant, when the amount of material to be conveyed is reduced, the cross-sectional area of ​​the material is reduced, and when the speed regulation mode is adopted, when the amount of material to be conveyed is reduced, the filling rate of the material is maintained by reducing the belt speed. In the past, this measure was mistaken for extending the service life of the conveyor belt joints and thus extending the service life of the entire conveyor belt. The following findings will be used to prove that this view is incorrect.

1. Influence of belt conveyor speed control on the drive system

First, the relationship between the various components of the belt conveyor and the speed of the conveyor belt is analyzed. Figure 1 is a schematic view of the main components of the belt conveyor. The belt conveyor mainly consists of two rollers (head roller and tail roller); of course, the long-distance belt conveyor needs more rollers. For reasons of space, the drive unit is not mounted on the front end of the conveyor, but is mounted in the rear of the face roller.

(1) Belt conveyor feeding/unloading

The design of the unloading system requires consideration of several factors. The first is the flow characteristics of the material. Depending on the flow characteristics, the unloader is usually designed as a chute or a bin to prevent material from adhering to the surface or pile up. At the same time, the discharge direction must be consistent with the running direction of the conveyor belt (ideally at the same speed) to prevent the material from slipping on the conveyor belt and causing wear. For some special factors, it should be considered according to the actual situation, such as material humidity, to ensure smooth discharge. Other factors to consider include: material specific gravity, material particle size, and the center of gravity distribution of the particles. These parameters determine the material trajectory (parabola) at the time of unloading: when the material is discharged from the drum, the light and fine material is denser than the heavy and coarse material. For the feeding device, it must be designed in a targeted manner.

Obviously, the factors mentioned above have a great impact on the design of the discharge point. If the speed of the belt conveyor is variable, the discharge point must be adjusted to the changing material path (parabola) to prevent material from adhering or accumulating (a challenge for design engineers).

(2) Belt conveyor roller/roller

For the same belt conveyor system, as long as the system is centered, the carrying roller face and the roller are rarely worn. Therefore, the factor that actually limits the life of the carrying roller is the bearing.

The service life of a bearing is highly dependent on the load (in inverse proportion), not the speed. Therefore, if the average filling rate on the conveyor belt is always high due to the control of the speed, the service life of the bearing is lowered.

(3) Belt conveyor materials

The revised German standard DIN 22101 also takes into account the fatigue strength of conveyor belt joints. The fatigue resistance indicates the service life of the conveyor joint (depending on the change cycle of the belt tension and load). The duty cycle refers to the cyclic change cycle of the conveyor belt load from high tension to high tension. For example, when the conveyor belt rotates around the drum, the conveyor belt is subjected to direct extrusion of the drum and stretching in the outer diameter direction, that is, the conveyor belt is in a high tension state. The change in load is accounted for by the tensile length of the conveyor belt before and after unloading (ie, the difference in length between the belt being straightened and sagged).

Conveyor belt depression resistance is mainly determined by the belt tension and the material load on the conveyor belt. The greater the tension, the smaller the conveyor belt depression resistance; the greater the material load, the greater the conveyor belt depression resistance.

However, the belt tension is only affected to some extent. On the one hand, the transitional sagging of the conveyor belt is not allowed by the design specifications. On the other hand, the traction must also be as small as possible. Therefore, the only adjustable material load is the material load. With the conveyor belt constant, the roller bending resistance will decrease as the load is reduced.

(4) Belt conveyor drive

The bearings and shafts of the transmission have different natural frequencies, and short-term operation (that is, during the traditional starting process) does not cause harm, but if it is operated for a long time (when they reach the critical bending frequency), the transmission will be Causes great damage and equipment damage. This study is based on frequency analysis. The study also found that in order to avoid damage to the transmission, the belt conveyor can no longer be operated in a specific speed range. By analyzing the frequency of a 1000kW class transmission, it is possible to have a narrow speed window between 400r/min and 500r/min. There is also a speed between 650r/min and 900r/min and 1200r/min. Speed ​​window. If the conveyor is running in these speed ranges for a long time, there may be a resonance accident.

It should also be pointed out that the affected speed range will certainly be affected by different proportions, different materials and different material strengths.

(5) Belt conveyor control

It can be seen that in the case of large changes in load and no-load, the conveyor belt speed is reduced to some extent, which may cause material overflow at the discharge point. In addition, it should be noted that speed control through the corresponding monitoring of the load amount will consume a lot of labor. Conveyor speed does not increase or decrease immediately, and it takes a while to increase or decrease. Taking into account the situation at the discharge point mentioned in the previous overview, the control system must be able to adapt to the reload during this time period.

The claim that speed control of belt conveyors can save energy has proven to be erroneous. The advantages of constant belt speed and varying loading have been verified, and the idea that control speed prevents belt wear has been denied. In summary, the problems posed by conveyor belt control measures have been proven.

Therefore, you should try to break through the bottleneck of the belt conveyor and always operate with full load material to maximize the benefits without having to find a solution that needs to reduce the speed of the conveyor belt.

New Chain Conveyors Rely On Core Technology Development

#chaintransportmachinery #drugchainconveyors #chainconveyormachinery #conveyordesigners #drugchainconveyormachinery #drugdeliverymachinery #productionofmachinery #twochainconveyors

    Throughout the entire conveyor industry, we found that the overall technical level of the domestic chain conveyor is not enough, and can not produce the first delivery equipment. In addition, there is no perfect development plan in the industry, and the government lacks corresponding macro-control, resulting in the backward development of domestic chain-transport machinery.

    The products produced to meet the needs of the international market need to be transported at an international level. In the future, the market of chain conveyors in China will grow rapidly. In the field of medicine, the demand for transportation has also increased rapidly, which has promoted the development of drug chain conveyors at a certain level.

    Advanced chain conveyor machinery adopts a number of new detection systems to ensure the stable and reliable operation of the chain conveyor. With the increasing penetration of automation vendors and the development of information technology, more and more conveyor designers have accepted advanced automation technology and used advanced automation products to improve equipment performance. The overall level of China's chain conveyors has been behind the level of developed countries for many years. In addition to the improvement of the technical level of domestic manufacturers, the localized production of foreign manufacturers has also greatly promoted the automation level of China's chain conveyors. The trend toward internationalization is the purpose of drug delivery machinery. However, it is far from enough to rely on the slogan. The drug chain conveyor machinery wants to truly embark on the international stage. To move toward the high end, it must conform to the development trend of the times. Modern technology is integrated into the production of machineryto complete the efficient and intelligent equipment.

    The new chain conveyor machinery is often a mechatronics device that makes full use of the latest achievements in information products. The designers of some Chinese companies are unfamiliar with electronic products, and they dare not or will not choose, which greatly limits the level of chain conveyors. For example, many foreign new chain conveyors have adopted separate transmissions, which has greatly shortened the transmission chain of the whole machine, greatly simplified the structure, and greatly improved the work accuracy and speed. One of the core technologies is to adopt the synchronization technology of multi-motor drag. In fact, it is not difficult to master this technology, but some designers do not understand the development trend of the chain conveyor. Another core technology is the large adoption of servo drives, but the old designers will not design and use servos and their control systems.

    Entering the international market has become an important goal for the development of China's transportation industry. If the drug chain conveyor machinery wants to truly enter the international arena and move toward the high-end, it must conform to the development trend of the times and integrate modern technology into the production of machinery to complete the efficient and intelligent equipment. In the future, the development direction of the drug delivery industry will be through the continued application and promotion of high-tech, arming and strengthening the overall level of the industry, and continue to improve the localization of high-end transportation equipment through technology improvement and optimization.

    After two or three decades of development, China's transportation industry continues to develop. Although China has become the second largest transportation country in the world, there are still many shortcomings compared with other countries. At present, China is constantly exploring the international market, and technology is still a short-board.

    The ordinary chain conveyor is based on the standard chain plate, and is driven by the motor reducer. We can make the chain conveyor wide and form a differential through multiple rows of chain plates, using multi-row chains. The speed difference of the board makes the multi-column conveying become a single-row conveying without extrusion, so as to meet the requirements of single-column conveying of beverage labeling, filling, cleaning and other equipment, we can make the head and tail of the two chain conveyors The overlapping mixed chain makes the bottle (can) body in a dynamic excessive state, so that the material is not retained on the conveying line, and the empty bottle and the solid bottle pressure and pressureless conveying can be satisfied. In the production of chain conveyor, our company relies on advanced technology development and has gained the trust of consumers. Therefore, both the ordinary chain conveyor and the new type of chain conveyor rely on the advantages of technology in the transportation industry.

Belt Conveyor High Efficiency Motor Application

#beltconveyors #beltconveyor #transmissionsystem #conceyorline

 When conveying the material, the belt conveyor uses a high-efficiency motor to operate the rotating machine, which can accelerate the transportation of the conveying equipment more quickly. The conveyor line body of the belt conveyor can be selected according to the needs of different processes, and can also be used for various control modes such as continuous operation, cycle operation, and variable speed operation. The conveying line body should be in the form of conveying lines such as straight lines, curved roads and slopes. With the development of various industries and the demand of the market, high-efficiency motors are increasingly used in belt conveyors.

    Belt conveyors use high-efficiency motor losses that are about 20 percent lower than current motors, and ultra-efficient motors in belt conveyors can reduce application losses by about 30 percent compared to current motors. China and the EU divide the efficiency of small and medium-sized three-phase asynchronous motors into three efficiency standard grades, first-class energy efficiency, second-level energy efficiency, and mandatory regulations. The general motor is lower than the three-level energy efficiency, can not be produced and sold, and the motor appears. When you want to paste the energy efficiency rating mark in a uniform format. The rated power of the energy efficiency level is in the range of 3kw to 315kw, the rated power of the energy efficiency secondary and tertiary is in the range of 0.55kw to 315kw, and the number of motor stages is mostly two to six explosion-proof motors.

    The production and sales of high-efficiency motors are not obvious for the increase of the transmission system cost of the belt conveyor. According to the survey, the belt conveyor motor accounts for 92% of the operating cost in a life cycle, and the purchase cost is 100%. Seventh, the maintenance cost is only one percent. If the efficiency of the motor is increased, the electricity cost saved will be much higher than the procurement cost. Although the rated efficiency of high-efficiency asynchronous motors is relatively high, the load is relatively light and the efficiency is relatively low. There are still some disadvantages, and the rare earth permanent magnet synchronous motor does not have the scientific development of this problem. I believe in the future. During the year, rare earth permanent magnet synchronous motors can be used in a wider range of applications.

Linear Knife Belt Conveyor For Material Protection

#beltconveyor #thelinearknifebeltconveyor #knifebeltconveyor

With the development of various industries and the development of the market, linear knife belt conveyors have gradually become the necessary transportation equipment for various industries. When the linear knife belt conveyor is used as the traction member and the conveying length is large, the conveying speed should not be too large to prevent the increase of the dynamic load. For linear knife belt conveyors that perform process operations at the same time, the conveying speed should be determined according to the requirements of the production process. In the process of transporting materials by a linear knife belt conveyor, the running time and efficiency determine the amount of coal transported by the linear knife belt conveyor. To this end, the running time should be increased as much as possible. Generally speaking, under the same load condition, the higher the operating rate of the equipment, the larger the conveying capacity. Therefore, in the machine work, all feasible and effective methods should be adopted to reduce the running time. For example, in the work, if the linear knife belt conveyor fails, the temporary maintenance method can be adopted to ensure the normal operation of the equipment and the repair and maintenance work is postponed to work if the guarantee range is not expanded and the front dam is not affected. After the end.

    During the operation of the linear knife belt conveyor, the running time and efficiency determine the conveying capacity of the linear knife belt conveyor. To this end, the running time should be increased as much as possible. In general, the higher the operating rate of the equipment under the same load conditions, the greater the throughput. Therefore, in the work of the machine, it is necessary to adopt all feasible and effective methods to reduce its running time. For example, in the work, if the linear blade belt conveyor malfunctions, under the premise of ensuring that the fault range does not expand and does not affect the subsequent work, temporary maintenance can be adopted to ensure the normal operation of the equipment, and the repair and maintenance work is postponed until After the work is over.

    In addition, during the operation of the linear knife belt conveyor, there may be curvature in the vertical and horizontal directions, but it must be controlled within the allowable range. If the elbow is too large or has a sharp bend, the chute will be damaged under the action of external force. Once the chute is lost or damaged, the joint will be out of control. At this time, the powder will leak into the trough, which not only increases the running resistance, but also A safety incident may result from a blockage. Linear knife belt conveyors can be used for horizontal transport or for inclined transport. When the linear knife belt conveyor is transported obliquely upward, the inclination angle of the coal seam shall not exceed 25°. When transporting downward, the inclination angle shall not exceed 20°. When the inclination angle of the coal seam is large, anti-skid devices shall be installed. The flexible linear knife belt conveyor allows bending in the horizontal and vertical directions of 2°-4°. In addition, linear knife belt conveyors can cause personal safety accidents if they are not laid flat.

    Standard operation of linear knife belt conveyor to improve operational stability

    In order to ensure the stability of the linear knife belt conveyor operation, it is necessary to standardize the operation, starting from the following aspects:

   (1) Before starting the linear knife belt conveyor, it must be intermittently jogged, and after a few seconds, it will be officially started. The main purpose of this is to determine whether the linear knife belt conveyor can run normally, and at the same time, It should be used as a warning for people walking nearby; usually, the linear knife belt conveyor should be started first, then the coal should be loaded, and the load should not be forced to start; if it is started, if it does not start normally, you need to find out Reason, and do a good deal in time.

   (2) During the start-up process, the starting direction should be started from the outside to the inside in the direction of the reverse flow; if the machine stops running, it cannot be packed.

   (3) In the working surface, in order to avoid the linear knife belt conveyor can not be started due to full load, it is better to adopt the segmentation method and take effective measures; in order to avoid accidents, the linear knife belt conveyor runs stably and maintains the load. Reasonable operation of the conveyor

    In the operation of the linear knife belt conveyor, in order to ensure the effective performance of its transport capacity, it is best to ensure that its load reaches the rated value. In the course of operation, if there is too little load, not only will it not be a work target, but the running ability will not be fully exerted; if there is too much load, the object will overflow the chute, which wastes labor and can cause damage to the machine. . In addition, in order to ensure the safe operation of the equipment, the service life of the linear knife belt conveyor is improved, and the uniformity of the load operation is also ensured.

Classification Of Automatic Vertical Conveyors

 #Standarddrumtypeautomaticverticalconveyor #automativeverticalconveyor #verticalconveyor

In China, automatic vertical conveyors are commonly referred to as reciprocating hoists, vertical hoists, special non-manned elevators, and the like. At present, the safety standards and specification certification of the conveyor have not been unified. It can be said that the management is not the norm is the status quo of vertical conveyor development in the Chinese market.

    (1) Standard drum type automatic vertical conveyor

    The standard drum type automatic vertical conveyor has stable performance, low failure rate and long service life. The height of the horizontal conveyor can be designed into floor and stack according to different loading and unloading conditions (land cattle loading and unloading, logistics truck, forklift loading and unloading). In two ways, the flexible docking method can be flexibly linked with AGV, RGV, and air shower system.

   (2) Special tray circulation type automatic vertical conveyor

    The conveyor is characterized by the use of a double-deck pallet conveyor system in conjunction with the lifting operation of the electric lift to achieve low-load loading and unloading at the high point, and to realize the high-efficiency handling capacity of a multi-purpose, multi-loading and unloading method (suitable for forklifts and logistics vehicles). Thanks to the design concept of the random pallet, various pallets (including slightly damaged pallets) can also be transported continuously.

   (3) Special pallet circulation PL type automatic vertical conveyor

    This type of automatic vertical conveyor is characterized by the combination of special pallet circulation type automatic vertical conveyor and standard drum type conveyor, and adopts special tray 2-layer circulation structure to realize multi-purpose and multi-loading mode of one machine (suitable for At the same time, the efficient handling capacity of forklifts and logistics vehicles, as well as the design concept of random pallets, enables various pallets (including slightly damaged pallets) to be continuously transported. Compared with the special pallet circulation type automatic vertical conveyor, it has better extensibility and expandability.

    (4) Special tray circulation TL type automatic vertical conveyor

    This type of conveyor is designed for special products and uses the design concept of dedicated pallets and electric table lifting platforms to make the transportation of irregular products such as paper rolls easy. The utility model realizes the performance of handling at a low place, and at the same time, the roller conveyor adopts a two-layer design structure, realizes the simultaneous entry and exit of the special tray, avoids the waiting time, and the requirements for the moving objects are more relaxed.

    The design of the double-layer drum enhances the stability of the system and is more durable.

    (5) High-load inter-floor forklift truck handling up and down corresponding to simple cycle HB type vertical conveyor

    This type of automatic vertical conveyor is characterized by outstanding load capacity and a maximum load of up to 5 tons, which makes it possible to distribute the forklift between floors. It also eliminates the need for automatic vertical conveyors in the logistics center while reducing secondary handling operations. The problem that the rear forklift can no longer circulate between floors.

    It should be noted that the safety requirements of the equipment that cannot be carried by the automatic vertical conveyor cannot be violated. The forklift driver needs to leave the forklift to start the equipment.

   (6) Space saving STEPII simple vertical conveyor

    This type of automatic vertical conveyor eliminates the need for opening work on the ground, saves space in older warehouses, and is designed to be assembled using the entire machine. It can also deal with the complex product types/shapes of the integrated logistics center, and various loading and unloading methods (forklift loading and unloading, land loading and unloading, logistics vehicles, cage trucks, manual loading and unloading, with or without rollers), and the weight difference is large.

   (7) Automatic continuous handling of automatic vertical conveyors in light loads.

Fruit And Vegetable Picking And Conveying Cleaning Water Production Line

#conveyingcleaningwaterprouductionline #liftingconveyor #rollerselectionconveyor #conveyorbelt

The fruit and vegetable picking andconveying cleaning water production line is suitable for lifting picking and conveying cleaning of leafy vegetables, roots and vegetables and fruits. This equipment uses lifting machines, roller picking conveyors, bubble cleaners and other equipment.

1. The lifting conveyor is suitable for lifting and conveying materials.

working principle

After the machine is turned on, the material is placed in the hopper and transported to the next process by the conveyor belt.

feature

The conveyor belt is made of safe and environmentally friendly PVC material

The body is made of food grade 304 stainless steel

Wide range of applications, suitable for most materials

Used in conjunction with production lines

2. Roller selection conveyor is suitable for material selection and transportation, manually selecting unqualified defective products, less than required materials or dust falling from the gap between the rollers, and the qualified products are automatically transported to the next process.

working principle

After starting the machine, place the material on the conveyor belt (or directly from the previous process to the conveyor belt), manually select the unqualified defective products, less than the required materials or dust falling from the roller gap, the qualified materials are The roller conveyor belt is transported to the next process.

feature

Manual sorting

The rolling bar makes the material rollover, which is convenient for manual selection of defective products.

Qualified products are transported by the rollers to the next process

Materials and dust less than the required size fall from the gap in the supply port

The conveyor roller is made of food grade 304 stainless steel

The body is made of food grade 304 stainless steel

Suitable for round materials

Connected production line

3. The bubble cleaner is suitable for cleaning leaves and root vegetables and fruits.

working principle:

The washing machine adopts the principle of bubble cleaning, and the bubble generating device is arranged in the cleaning tank. The bubble simulates manual cleaning, gently rubbing the surface of the material and continuously turning the material in the water, thereby cleaning the material. The washed material is automatically lifted to the next process by the conveyor belt.

feature:

Made entirely of high quality 304 stainless steel, in line with international food industry standards

Well-known brand electrical components and control systems

High pressure bubbles mimic the principle of manual cleaning

The spray valve above the pool cleans the material from the top

The spray valve in the climbing part can be connected to the tap water, and the material can be cleaned a second time by washing.

The cleaned vegetables are automatically raised to the next process or container

Free control of operating speed via frequency converter

Ozone disinfection (optional)

Food Grade Belt Conveyor for Corn Transmission

#FoodGradeBeltConveyorforCornTransmission #elevatorconveyor #conveyorsystem #foodfactoryautomationline #straightrunningbeltconveyor