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1.INTRODUCTIONAt present, there are many traction plates on the market. Zhengzhou Luchi Machinery Equipment Co., Ltd. has developed a sheep horn traction plate, which is characterized by a short straight line of contact with the bottom of the pulley groove, no contact with the pulley rim, low resistance when passing through the pulley, small size of the walking plate, and light weight [1]. A roller blind traction plate designed by Tianjin Zhongneng Electric Power Technology Co., Ltd. is characterized by adding transition links between the main rotator and the auxiliary rotator to reduce the impact of passing through the pulley [2]. The pulley-type traction plate designed by Ningbo Huaxiang Dongfang Electric Machinery Co., Ltd. is characterized by a balanced pulley system that can balance the forces on both sides of the traction plate, making it less prone to flipping [3]. A hybrid traction plate designed by Changshu Electric Power Machinery Co., Ltd. is characterized by a double guided sheep horn at the front end of the front connecting plate to prevent the walking plate from falling out of the groove when passing through the pulley [4]. A hinge is designed between the front and rear connecting plates to effectively reduce impact resistance [5]. The traction plate designed above, due to the lack of simulation verification under complex working conditions, has not effectively solved problems such as groove detachment in complex situations such as angle tower pulleys [6]. In response to such issues, this article compares and analyzes the dynamic simulation of the sheep horn traction plate and the traditional traction plate passing through the angle tower pulley based on the finite element method, and summarizes the simulation method that is suitable for the actual working conditions of the traction plate. 2.COMPARISON OF TRADITIONAL TRACTION PLATE AND SHEEP HORN TRACTION PLATE STRUCTURESTwo typical types of traction plates, traditional traction plate and sheep horn traction plate, were selected as the research objects. Table 1 compares the advantages and disadvantages of traditional traction plate and sheep horn traction plate structures. Table 1.Comparison of advantages and disadvantages between traditional traction board and sheep horn traction board structures.
3.COMPARATIVE ANALYSIS OF DYNAMIC SIMULATION BETWEEN TRADITIONAL TRACTION PLATE AND SHEEP HORN TRACTION PLATE PASSING THROUGH A PULLEY3.1Finite element modelingEstablish a finite element analysis model for a traction plate passing through a pulley, as shown in figure 1. Hanging ropes, traction ropes, and wires are simulated using truss Truss elements, which have low stiffness and are suitable for simulating flexible bodies. The pendulum is simulated using linear beam element B31, which is suitable for simulating slender beams as well as short and thick beams. The pulley adopts S4R shell element simulation, which is effective for both thin and thick shell problems. The models are homogeneous, isotropic, and linearly elastic. First, combine the hanging rope with the pulley, the traction rope with the traction plate and the wire, and then finally assemble them. The performance parameters of each material are shown in table 2. Table 2.Material performance parameters.
3.2Boundary conditions and loadsAs shown in figure 2, two hanging ropes are coupled with the pulley at the kinematic coupling constraints RP-1 and RP- 2, respectively. A rigid constraint reference point RP is set at the center of the traction plate, displacement is applied at the left end of the traction rope, fixed constraint is applied at the upper end of the hanging rope, and wire tension F is applied at the right end of the guide wire. A universal contact that only includes normal contact force is set between the wire and the pulley. 3.3MeshOne traction and two traction plates pass through the pulley, and the types of traction ropes, hanging ropes, and wire units are Truss units, with a total of 3218 units; The pay-off pulley adopts shell S4R units, with a total of 22944 units; The pendulum adopts 210 B31 beam units; The sheep horn traction plate adopts 258 C3D8R solid units, while the traditional traction plate adopts 208 C3D8R solid units. 3.4Simulation calculation of one traction and two traction plates passing through the angle tower pulley(1) Working condition During the laying process, when the traction plate passes through a 10 ° angle tower of the pulley, the following working conditions are set due to factors such as wire tension and envelope angle. The rated breaking force (RTS) of JL/G1A- 630/45-45/7 steel-cored aluminum stranded wire is 150.45kN, and the calculated working conditions are shown in table 3. Table 3.Working condition table for one traction and two traction plates passing through the angle tower pulley.
(2) Result 1) Wire tension As shown in Figure 3, it can be seen that when a traditional traction plate and a sheep horn traction plate pass through a corner tower pulley, the greater the tension of the wire, the greater the supporting reaction force and the greater the impact force. Figure 3.Comparative analysis of the reaction force of traditional and sheep horn traction plates passing through angle tower pulleys under different wire tensions.  As shown in figure 4, it can be seen that when the pulley is tilted at 10 °and under the same wire tension condition, the peak support reaction force of a 2-leg angle traction plate passing through the angle tower pulley is much smaller than that of a traditional 2-leg angle traction plate. Compared with the traditional traction plate, the indirect contact force between the traction plate and the pulley is smaller, making it easier to pass through the pulley. Figure 4.Comparative analysis of supporting reaction force between traditional and new traction plates under the same tension.  2) Envelope angle As shown in figure 5, it can be seen that when a traditional traction plate and a sheep horn traction plate pass through a corner tower pulley, the larger the envelope angle, the greater the supporting reaction force and the greater the impact force. Figure 5.Comparative analysis of reaction forces of traditional and sheep horn traction plates passing through angle tower pulleys at different envelope angles.  As shown in Figure 6, it can be seen that when the pulley is tilted by 10 °, under the same envelope angle condition, the peak support reaction force of a 2-leg angle traction plate passing through the angle tower pulley is much smaller than that of a traditional 2-leg traction plate. Compared with the traditional traction plate, the indirect contact force between the traction plate and the pulley is smaller, making it easier to pass through the pulley. 4.CONCLUSIONThe main conclusions are as follows:
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