Structure and engineering application of double-speed chain conveyor line:

1. The structure of the double-speed chain conveyor line

      On the basis of the double-speed chain, plus the motor drive system and other accessories, the double-speed chain conveyor line can be formed. Typical double-speed chain conveyor line structure composed of double-speed chain chains. In engineering, the actual length of the double-speed chain conveyor line is usually up to tens of meters.

Typical double-speed chain conveyor line structure

      A typical double-speed chain conveyor line is mainly composed of the following parts:

      • Tooling board

      • Stopper mechanism

      • Double speed chain chain

      • Chain support rails

      • Motor drive system

      • Rotary guide seat

      • Chain tension adjustment mechanism

      (1) Tooling board

      The tooling plate is an indispensable conveying tool for the automated production line (also widely known as a fixture in engineering). It is a load directly placed above the chain roller. The conveyed material or workpiece is directly placed on the tooling plate. Therefore, the tooling plate It is specially designed according to the shape and size of the workpiece to be conveyed.

      ①Material for making tooling board

      Tooling boards are generally made of plywood, reinforced PVC board, one-shot plastic board, plywood and PVC composite board;

      ②Surface material

      Since the tooling plate is not only the automatic conveying carrier of the workpiece, but also the assembly and inspection of the product are also carried out on the tooling plate, so the surface material of the tooling plate should have corresponding special requirements according to the process needs, such as anti-static and wear resistance. Usually, the surface of the tooling board is made of anti-static rubber, pyramid-shaped wear-resistant anti-skid rubber, PP plastic wear-resistant plate, anti-static blanket, anti-static high-density sponge and other materials.

      ③Structure

      In manual assembly lines or automated production lines, since certain processes require various assembly, testing, debugging, aging and other processes on the workpiece on the tooling board, in addition to the workpiece positioning fixtures on the tooling board, it is often necessary to set a power supply. Sockets, switches, detection signal receiving devices, etc.

      Since the tooling board is placed on the double-speed chain and moves with the chain, it is easy for the tooling board to obtain power from the conveyor line, but it cannot carry the usual power cord. Therefore, two special power lines are designed below the tooling board along the conveying direction. The electrode is made of copper alloy conductive metal sheet, and a series of special conductive wheels (also called electron collectors in engineering) or conductive grooves are designed on the conveyor line.

Conductive wheel on double speed chain conveyor line

      The material of the conductive wheel is also a copper alloy metal with good electrical conductivity, which is divided into unidirectional conduction and bidirectional conduction. In this way, when the tooling plate stops at the position where the assembly operation is required, the conductive electrode sheet under the tooling plate is just replaced on the conductive roller on the conveyor line, and the conductive electrode sheet under the tooling plate is automatically powered on, and when the tooling plate leaves After the above position, the power is automatically cut off.

      (2) Stopper mechanism

      In an automated production line or manual assembly line composed of a double-speed chain conveyor line, the tooling plate (together with the workpiece) needs to be stopped at various operating positions for assembly or inspection, while the conveyor line runs continuously. How to make the tooling plate What about stopping at a position where process operations are required?

      In order to solve the above problems, a series of blocking mechanisms are specially designed in the middle of the conveying line, so that the tooling plate stops advancing at the position where the process operation is required. This blocking mechanism is called a stop mechanism. It is generally a special cylinder, called a stop cylinder.

Commonly used stopper cylinders in engineering

      In the manual assembly line, when the workpiece is transported to the assembly station with the double-speed chain conveyor line on the tooling plate, the stopper cylinder in the middle of the conveying line is in an extended state, and the front of the tooling plate touches the roller at the end of the stopper cylinder piston rod. When the stop cylinder stops the movement of the tooling plate. When the assembly operation is completed, the worker steps on the air valve foot pedal below the station, the stopper cylinder piston rod retracts, and the tooling plate automatically resumes forward. This feature of the double-speed chain conveyor line makes it very suitable for free-rhythm. Manual assembly line.

      In the case of small loads, a stop cylinder with a compression spring inside the cylinder is used. When there is no air pressure, the piston rod is in an extended state, and the spring can absorb the impact energy of the tooling plate. In the case of heavy load, the stop cylinder with hydraulic vibration absorber is used. When the front of the tooling plate touches the roller at the end of the piston rod of the stop cylinder, the roller bar presses the buffer rod of the hydraulic vibration absorber to obtain buffering, so that the tooling plate can be buffered. Implement a soft stop.

      In the automated assembly line, the telescopic action of the stopper cylinder is realized by sensors and control systems.

      (3) Double speed chain chain

      The double-speed chain is connected with chain links into a closed ring structure, and then the double-speed chain is installed on the support guide rail and driving sprocket of the conveying system, and then the tooling plate is placed above the chain to transport the material. As mentioned above, the double speed chain chain is designed and produced according to a specific standard size.

      (4) Chain support rail

      The double-speed chain chain is driven by the sprocket, and the chain is supported by the rollers directly placed on the support surface of the guide rail. The chain is dragged by the sprocket, and the rollers roll on the support guide rail, so that the chain carries the tooling plate and The material moves forward.

      The guide rail is generally cut and connected by specially designed and manufactured aluminum profiles according to the required length.

Typical cross-sectional shape of double-speed chain support rail

      (5) Drive system

      To make the chain advance on the support surface of the guide rail, it is necessary to apply some traction force to the chain, drag the chain to roll forward on the support guide rail, and the common method of driving the double-speed chain chain is sprocket drive.

      ①The composition of the drive system

      The drive system of the double-speed chain conveyor line is similar to the drive system of the belt conveyor line, but because the load of the double-speed chain conveyor line is usually larger, the double-speed chain conveyor line is generally driven by an ordinary sleeve roller chain drive system. In the whole drive system, after the motor passes through the reducer, it transmits the torque to the drive shaft installed with the double-speed chain drive sprocket, and then drives a series of rollers on the double-speed chain through the drive sprocket to drag the double-speed chain and the guide rail. Roll forward on the support surface.

      The whole drive system is mainly composed of the following parts:

      • Motor and reducer

      • Chain drive

      • Double speed chain drive sprocket

      Generally, in the design of the double-speed chain conveyor line, the installation structure of the motor is designed as a center-adjustable structure, so there is no need to use a tensioning sprocket to tension the transmission chain, and the chain can be adjusted directly by adjusting the installation position of the motor. The degree of tension simplifies the mechanism design.

      ② Double-speed chain drive sprocket

      The device that directly drives the double-speed chain is the double-speed chain drive sprocket located on the above-mentioned chain drive driven sprocket shaft. This drive sprocket is very similar to the ordinary chain drive sprocket, but there are also the following differences:

      • Fewer teeth

      Due to the generally large pitch of the conveyor chain, the chain movement speed is often required to be low. In order to reduce the chain speed and avoid the decisive diameter of the sprocket, a small number of teeth is generally selected.

      • Larger tooth pitch

      Since the pitch of the conveyor chain is generally larger than that of the transmission chain, the tooth pitch of the sprocket is correspondingly larger.

      • Reduced requirements for dimensional machining accuracy of sprockets

      Since the driving sprocket of the double-speed chain does not require reciprocating rotation during operation, and the operating speed is low, if the rollers on the chain can move along the circumference of the root circle of the sprocket, the pitch between the chain and the sprocket will be relatively small in time. Even with large manufacturing errors, the chain can still mesh with the sprocket, so the manufacturing precision of the conveyor chain and the sprocket can be reduced to reduce the manufacturing cost.

      •Conveyor sprockets generally use non-machined sprockets

      The sprocket of the conveyor chain is generally larger in size. Since the processing accuracy of the sprocket is reduced, in order to reduce the manufacturing cost, the sprocket is generally processed by a non-machining method.

      The size of the double-speed chain sprocket is manufactured according to the standard. The diameter of the sprocket and the shape of the end face groove are the same as those of the double-pitch roller conveyor chain.

      (6) Rotary guide seat

      The double-speed chain conveyor line is similar to the structure of the belt conveyor system. The chain forms an upper and lower closed loop. The upper section conveys materials, which is called the bearing section, and the lower section is used for the circulation of the chain, which is called the return section. In order to make full use of the space, the distance between the guide rails at the upper and lower ends is smaller than the diameter of the driving sprocket, which causes the double-speed chain to enter the return guide from the driving sprocket, or enter the driven sprocket from the return guide. It is easy for the chain to get stuck, which affects the normal transmission operation.

      In order to solve the above problems, a slewing guide seat can be added to the above two places respectively, so that the chain can smoothly enter and lead out the sprocket along the slewing guide seat.

      (7) Double-speed conveyor line tensioning mechanism

      Similar to the ordinary chain drive, the double-speed chain needs to set a suitable tension during the working process, otherwise the double-speed chain and the channel sprocket cannot be well meshed. In order to simplify the structure of the double-speed chain conveyor line, the drive shaft of the double-speed chain drive sprocket is generally designed to be in a fixed position, while the axle of the driven sprocket is designed to be adjustable, and the position of the driven sprocket can be adjusted as needed. This method is also used to adjust the tension of the double-speed chain, the tension of the belt in the belt conveyor line and the tension of the chain in the ordinary chain drive system, and the structure of this tension method is very simple.

      2. Application example of double speed chain

      Double-speed chains are widely used in various automated production lines and manual assembly production lines as an automatic conveying system for materials. Such as: used for refrigerator liner assembly line, DVD product assembly line, computer monitor assembly line, etc.

The above information is provided by Tai'an Taiding Lock Co., Ltd., contact: 13792120848