The bundle puller plays an important role in fields such as optical cable production. The tractor is usually composed of three parts: power mechanism, clamping device, and tractor travel rail. Its main engine adopts a DC motor to drive the main shaft gear, causing the chain to complete a reciprocating linear motion.
During the production process of optical cables, after the tube forming extruder forms a bundle tube on the outer side of the optical fiber, the bundle tube has a high temperature. At this time, the bundle tube is driven by the tractor to pass through the water tank, and the heat between the water in the water tank and the bundle tube is transferred to cool the bundle tube. The working principle of the tractor is mainly to generate traction by rotating the drive wheel through the power of the motor. Specifically, the tractor is connected to a heavy object through a rope, and under the drive of the motor, the heavy object is pulled or lifted to the destination through the friction between the rope and the drive wheel. The driving force of the motor is transmitted to the rope, and then to the heavy object through the tension of the rope, causing the heavy object to move.
Belt deviation of the tractor is a common problem, and the deviation principle includes “tight on the loose side,” that is, during the transportation of the tractor, the centerlines of the front and rear rollers are not parallel, resulting in different tightness on both sides of the belt, and the belt moves to the tighter side. The adjustment method is to adjust the position of the drive roller and the idler roller so that the installation position of all rollers must be perpendicular to the centerline of the length of the tractor to ensure that the two rollers are absolutely parallel; “high on the low side,” that is, the supporting idler roller is not at the same horizontal position parallel to the running direction of the belt, but one end is high and the other end is low, then the belt will move to the higher end; “back on the front side,” that is, the idler roller is not on the section perpendicular to the running direction of the belt, but one end is in front and the other end is behind (depending on the running direction of the belt), then the belt will move to the rear end. For example, why does the belt of the tractor always deviate when it starts? When the machine is just started, there is no or very little air in the pulled tube, and in this case, the pulled tube is irregular, with thick and thin sections. After the tube is cooled by water, it becomes very hard, and when a belt is used to pull this hard and irregular tube, the belt will be stuck, resulting in the belt always deviating.
How does the bundle puller play a role in optical cable production?
The bundle puller plays a crucial role in optical cable production. In the optical cable production process, the secondary sheathing (bundle tube process) is one of the key links. The bundle puller can precisely control the excess length of the optical fiber in the bundle tube, which is crucial for the performance of the optical cable. The excess length of the optical fiber generally refers to the excess length of the optical fiber in the loose tube, which is defined as the percentage of the difference between the length of the optical fiber and the length of the loose tube per unit length of the loose tube. During the production process, the fiber pay-off device, cooling system, excess length traction wheel, take-up device, and other links will all affect the excess length control. The bundle puller ensures that the position and excess length of the optical fiber in the bundle tube meet the requirements through precise traction and control, thereby improving the quality and performance of the optical cable. For example, in the heat shrinkage method, the optical fiber passes through the pay-off guide wheel through the extrusion head, is placed in the PBT loose tube, and the loose tube is filled with fiber paste, and is pulled by the disc traction wheel. The optical fiber will be close to the inner side of the PBT loose tube on the disc traction wheel due to the 放线 tension, forming a certain negative excess length. After the PBT loose tube enters the cold water tank, due to the temperature difference between cold and hot water, the PBT will have cold shrinkage, which not only compensates for the negative excess length, but also obtains the required positive excess length. The PBT loose tube can obtain the required excess length value through the action of the auxiliary traction tension and the take-up tension.
What are the components of the bundle puller?
The bundle puller usually consists of multiple parts. For example, traction motor, translation motor, upper crawler, lower crawler, etc. The upper and lower crawlers are both composed of a crawler and two guide wheels, and a bundle tube rolling reserved groove is arranged in the middle of the crawler. The input end of the traction motor is electrically connected to the main control cabinet, and the output end is connected to the driving guide wheel in the lower crawler; the input end of the translation motor is also electrically connected to the main control cabinet, and the output end is connected to the connecting shaft of the two guide wheels in the lower crawler. The traction motor and translation motor both adopt 2500W brushless DC motors, and the corresponding drive circuits all adopt three-phase full-bridge drive circuits and MOSFET switches. In addition, some bundle pullers also include a housing, the bottom of the inner cavity of the housing is movably connected with a lower drive roller and a lower transmission roller, the top of the inner cavity is movably connected with an upper transmission roller and an upper drive roller, and the right ends of the lower drive roller and the lower transmission roller are fixedly sleeved with a pulley one, and the surface of the pulley one is movably connected with a belt one.
Principle of belt deviation of the tractor
There are mainly several principles of belt deviation of the tractor. The first is the “tight on the loose side.” During the transportation of the tractor, the centerlines of the front and rear rollers are not parallel, resulting in different tightness on both sides of the belt, and the belt moves to the tighter side. The second is the “high on the low side.” The supporting idler roller is not at the same horizontal position parallel to the running direction of the belt, but one end is high and the other end is low, then the belt will move to the higher end. The third is the “back on the front side.” The idler roller is not on the section perpendicular to the running direction of the belt, but one end is in front and the other end is behind (depending on the running direction of the belt), then the belt will move to the rear end. For example, why does the belt of the tractor always deviate when it starts? When the machine is just started, there is no or very little air in the pulled tube, and in this case, the pulled tube is irregular, with thick and thin sections. After the tube is cooled by water, it becomes very hard, and when a belt is used to pull this hard and irregular tube, the belt will be stuck, resulting in the belt always deviating.
How does the bundle puller drive heavy objects?
The bundle puller usually uses a motor to provide power to drive the crawler or belt to realize the traction of heavy objects. For example, in the production of optical cables, the output end of the traction motor of the bundle puller is connected to the driving guide wheel in the lower crawler, and the heavy objects such as the bundle tube are driven to move through the operation of the crawler. Some bundle pullers also adopt a transmission method of pulley and belt, such as the lower drive roller and the lower transmission roller at the bottom of the inner cavity of the housing, which realize the traction of heavy objects through the transmission of pulley one and belt one. In addition, in some traction equipment for the production of bundle tubes, including parts such as the base, upper traction frame, lower traction frame, two sets of motors, two sets of reducers, two sets of drive wheels, and two sets of driven wheels, through the drive of the motor and reducer, the cooperation of the drive wheel and the driven wheel, and the operation of the upper and lower traction belts, the traction of the bundle tube is realized, thereby driving the movement of heavy objects.
Adjustment method of the bundle puller
There are many adjustment methods for the bundle puller. For the problem of belt deviation, the position of the drive roller and the idler roller can be adjusted so that the installation position of all rollers must be perpendicular to the centerline of the length of the tractor to ensure that the two rollers are absolutely parallel, so as to solve the problem of “tight on the loose side.” If there is a phenomenon of “high on the low side” or “back on the front side,” the idler group can be adjusted, and the side of the idler group that is biased towards the direction of the belt will move forward or backward. The tension of the tractor can also be adjusted. There are two idler rollers at the upper end of the tensioning position of the weight. These two idler rollers must be in a state of vertical and horizontal to the centerline of the axis of the belt, and in a state of synchronous and equal translation of the two bearing seats of the tensioning roller. If a hydraulic cylinder tensioning or screw tensioning is used, the two bearing seats of the tensioning roller must be in a state of synchronous and equal translation so as to always ensure that the longitudinal direction of the belt is perpendicular to the axis of the roller. For a bidirectional running bundle puller, when adjusting the deviation problem, one direction should be adjusted first, and then the other direction. During the specific operation, the relationship between the working direction of the belt and the deviation trend should be carefully observed, and adjustments should be made one by one. The key steps of adjustment should be the adjustment of the idler roller and the drive roller, followed by the adjustment of the material’s blanking point and idler.
The bundle puller plays an important role in fields such as optical cable production. It realizes the traction and control of heavy objects such as bundle tubes through precise components and working principles. During the use process, problems such as belt deviation may occur, which need to be solved through reasonable adjustment methods to ensure the normal operation of the bundle puller and the smooth progress of production.
