A belt pressing anti-jumping device

Abstract

The utility model belongs to coke conveying technical field, specifically disclose a kind of press belt anti-jitter device, including bottom plate, the both sides of bottom plate upper end are evenly connected with support frame, two The both sides of support frame upper end are evenly connected with support block, wherein two The rotation is connected between support block and another two support blocks with rotating roller, two The outer wall of roller is connected with belt, two The transmission connection of roller is connected with belt, wherein two The upper portion of one side of support frame is connected with stabilizing mechanism, the stabilizing mechanism includes connecting plate, the quantity of connecting plate is two groups, the utility model is adjusted belt tension in real time accurately by stabilizing mechanism, prevent belt deviation, combined with buffer mechanism High-efficiency absorption impact vibration, avoid component damage, realize the low jitter and high stable operation of coke conveying belt, improve conveying efficiency and equipment reliability, reduce material waste and maintenance cost.

Description

Technical Field

[0001] This utility model belongs to the field of coke conveying technology, and specifically relates to a belt pressing anti-jumping device. Background Technology

[0002] In industrial settings involving coke production and transportation, belt conveyors are core conveying equipment. However, belt vibration has long constrained conveying efficiency and production safety. Coke is characterized by good flowability, uneven particle size, and high hardness. Under loader feeding mode, the material feed fluctuates greatly and the material distribution is extremely uneven. This causes the belt to be subjected to instantaneous impact loads in certain areas, leading to sudden changes in tension and consequently, belt vibration. Furthermore, coke conveyor belts often operate under heavy loads and high speeds, making the dynamic tension fluctuations during equipment start-up and shutdown even more severe. The instantaneous increase in belt tension during startup is prone to… The tension jumps in the load-bearing section, and the inertial force when the belt stops under heavy load will cause irregular vibrations. Traditional tensioning devices are usually set in the belt return section, which can only make static adjustments to the overall tension. They cannot respond in time to the instantaneous tension changes in the load-bearing section caused by the impact of coke feeding. This makes the belt shake frequently when the local force is unbalanced. This shaking not only causes a lot of coke to spill, increasing material loss and manual cleaning costs, but may also cause serious failures such as belt tearing, fatigue damage to equipment parts, or even burning due to continuous vibration, posing great safety hazards and economic losses.

[0003] When the loader feeds material onto the conveyor belt, the fluidity and particle size differences of the coke can cause sudden increases or decreases in local load on the belt, resulting in instantaneous fluctuations in belt tension. The fixed tensioning structure cannot respond to these dynamic changes in time, which can lead to belt slippage and reduced conveying efficiency, or even belt tautness and tearing, increasing the risk of equipment failure. Furthermore, the coke loading and unloading process can easily cause severe belt vibration. During loading, the coke dumped by the loader creates an instantaneous impact on the belt, causing downward deformation and vibration in the belt's load-bearing section. During unloading, the reaction force of the falling coke at the end of the belt and the belt's own elastic rebound can cause irregular vibrations in the unloaded section of the belt. Belt vibration can easily lead to problems such as coke spillage and accelerated belt wear, which not only increases manual cleaning costs and material loss, but also shortens the service life of the belt and conveyor components. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a pressure belt anti-jumping device.

[0005] To achieve the above objectives, this utility model provides a belt tensioning anti-jumping device, including a base plate. Support frames are evenly connected to both sides of the upper end of the base plate. Support blocks are connected to both sides of the upper end of each of the two support frames. A rotating roller is rotatably connected between the two support blocks and two other support blocks. A belt is connected to the outer wall of each of the two rotating rollers, and the two rotating rollers are connected via belt drive. A stabilizing mechanism is connected to the upper part of one side of each of the two support frames. The stabilizing mechanism includes connecting plates, and there are two sets of connecting plates. A connecting rod is connected to the middle of one side of each of the two connecting plates. A cylinder is connected to the middle of one side of each of the two connecting plates. A moving rod is connected to one end of each of the two cylinders. A slider is slidably connected to one side of each of the two moving rods. A connecting block is connected to one end of each of the two sliders. A moving block is connected to one end of each of the two connecting blocks. A tension roller is rotatably connected between the two moving blocks. The lower end of the tension roller contacts the lower side of the inner wall of the belt. A buffer mechanism is connected between the two connecting rods.

[0006] In the above technical solution, the upper end of the base plate is connected to both sides of the belt, and the upper end of the multiple connecting frames is connected to the idler rollers. There are six sets of idler rollers. The upper ends of the multiple idler rollers are in contact with the upper sides of the inner wall of the belt. The multiple idler rollers are arranged in an inclined shape. The lower part of three of the connecting frames and the other three connecting frames is connected to the stabilizing rollers. The upper end of the stabilizing rollers is in contact with the lower end of the belt.

[0007] In the above technical solution, one end of each of the two connecting rods is inclined, one end of each of the two cylinders extends through to one side of each of the two connecting plates, one side of each of the two moving rods is connected to a guide rod, one end of each of the two guide rods extends through to one side of each of the two connecting plates, and guide openings are provided at each of the two connecting plates corresponding to the two guide rods, with the two guide rods located inside the two guide openings respectively.

[0008] In the above technical solution, further, each of the two moving rods has a sliding groove on one side, and the two sliders slide inside the two sliding grooves respectively. The cross-sectional shape of the sliding groove and the cross-sectional shape of the slider are both convex. The cross-sectional shape of the two moving blocks is an inverted I-shaped structure. Each of the two connecting rods has a moving groove on one side corresponding to the two moving blocks, and the two moving blocks slide inside the two moving grooves respectively.

[0009] In the above technical solution, the buffer mechanism further includes mounting rods, and there are two sets of mounting rods. Two cylinders are connected to both sides of the outer wall of the two mounting rods, and there are four cylinders. One side of each of the four cylinders is connected to one side of two connecting rods. A swing mechanism is connected inside each of the cylinders. Swing rods are connected to both sides of the outer wall of the two mounting rods. Buffer rollers are rotatably connected between two swing rods and two other swing rods. The lower ends of the two buffer rollers are connected to both sides of the lower end of the inner wall of the belt. One side of each of the multiple swing mechanisms is connected to one side of each of the multiple swing rods.

[0010] In the above technical solution, the swing mechanism further includes fixed blocks, and there are two sets of fixed blocks. The two fixed blocks are respectively connected to the two sides of the inner wall of the cylinder. A sliding rod is connected between the two fixed blocks. The sliding rod is in the shape of a semi-circular arc structure. A buffer block is slidably connected to the middle of the outer wall of the sliding rod. A buffer spring is connected to both sides of the buffer block. The two buffer springs are respectively sleeved on the two sides of the outer wall of the sliding rod. One end of the two buffer springs is respectively connected to one side of the two fixed blocks.

[0011] In the above technical solution, further, a stabilizing rod is connected to the middle of one side of the buffer block, one end of the two stabilizing rods extends through to the corresponding side of the cylinder, one end of the stabilizing rod is connected to one side of the swing rod, and a stabilizing groove is opened on the cylinder corresponding to the stabilizing rod, and the stabilizing rod slides inside the stabilizing groove.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The stabilizing mechanism enables precise dynamic adjustment of belt tension, effectively solving the tension fluctuation problem caused by uneven material feeding in coke conveying. Through the adaptation of convex grooves, sliders, moving blocks and moving grooves, the linear motion of the cylinder is stably converted into the vertical lifting and lowering of the tension roller. It can match the belt tension changes in real time, avoiding belt slippage due to insufficient tension or tearing due to excessive tension. At the same time, the cooperation of the guide rod, guide port and anti-detachment structure strictly limits the movement trajectory of the tension roller, eliminating belt deviation caused by horizontal offset during adjustment, ensuring the linear stability of belt conveying under heavy load conditions, and greatly reducing the risk of equipment failure.

[0013] The buffer mechanism has efficient vibration absorption and impact buffering capabilities, perfectly adapting to scenarios such as coke falling impact and equipment start-up and shutdown. When the buffer block slides along the slide bar, the buffer springs on both sides absorb the impact energy through elastic deformation, quickly slowing down the vibration and avoiding damage to the belt and components from rigid impact. Moreover, the buffering force is transmitted gently and evenly. The coordination of four sets of symmetrical swing mechanisms with the stabilizer bar and stabilizer groove ensures that the buffering force acts synchronously on both sides of the belt, preventing belt deformation caused by uneven local force, significantly extending the service life of components, reducing maintenance costs, and providing a reliable guarantee for the smooth operation of the belt. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the device proposed in this utility model; Figure 2 This is a schematic diagram of the connection structure between the connecting plate and the support frame proposed in this utility model; Figure 3 This is a schematic diagram of the connection structure between the connecting rod and the connecting plate proposed in this utility model; Figure 4 This is a schematic diagram of the installation structure of the tension roller proposed in this utility model; Figure 5 This is a schematic diagram of the connection structure between the cylinder and the fixing block proposed in this utility model; Figure 6 This is a schematic diagram of the connection structure between the swing rod and the buffer roller proposed in this utility model; Figure 7 This is a cross-sectional view of the movable block proposed in this utility model.

[0015] In the diagram: 1. Base plate; 2. Support frame; 3. Support block; 4. Rotary roller; 5. Belt; 6. Connecting frame; 7. Idler roller; 8. Stabilizing roller; 9. Connecting plate; 10. Connecting rod; 11. Cylinder; 12. Moving rod; 13. Slide groove; 14. Slider; 15. Connecting block; 16. Moving block; 17. Moving groove; 18. Tensioning roller; 19. Mounting rod; 20. Cylinder; 21. Fixing block; 22. Slide rod; 23. Buffer block; 24. Buffer spring; 25. Swing rod; 26. Buffer roller. Detailed Implementation

[0016] To better understand the above-mentioned objectives, features and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] like Figures 1-7 The image shows a pressure belt anti-jumping device.

[0018] The system includes a base plate 1, with support frames 2 evenly connected to both sides of the upper end of the base plate 1. Support blocks 3 are connected to both sides of the upper end of each of the two support frames 2. Rollers 4 are rotatably connected between the two support blocks 3 and the other two support blocks 3. A drive motor is connected to one side of one of the rollers 4. A belt 5 is connected to the outer wall of the two rollers 4. The two rollers 4 are connected by transmission through the belt 5. A stabilizing mechanism is connected to the upper part of one side of each of the two support frames 2. A buffer mechanism is connected between the two connecting rods 10. Connecting frames 6 are connected to both sides of the upper end of the base plate 1 corresponding to the belt 5. A number of rollers 7 are connected to the upper end of multiple connecting frames 6. There are six sets of rollers 7. The upper ends of the multiple rollers 7 are in contact with the upper sides of the inner wall of the belt 5. The multiple rollers 7 are set in an inclined shape. A stabilizing roller 8 is connected to the lower part of three connecting frames 6 and the other three connecting frames 6. The upper end of the stabilizing roller 8 is in contact with the lower end of the belt 5. The support frame 2 supports the support block 3 and the rotating roller 4, ensuring the installation height and level of the rotating roller 4. The support block 3 provides rotational support for the rotating roller 4, reducing friction during rotation and ensuring stable operation of the rotating roller 4. The rotating roller 4, in conjunction with the drive motor, drives the belt 5 for cyclic transmission to realize material conveying. The belt 5 directly carries and conveys the material. The stabilizing mechanism is used to adjust the tension of the belt 5 and suppress the shaking caused by tension fluctuations. The buffer mechanism is used to absorb the instantaneous impact and vibration during the operation of the belt 5, further ensuring the smooth operation of the belt 5. The connecting frame 6 fixes the idler roller 7 and provides installation support for the idler roller 7. The idler roller 7 makes the belt 5 form a V-shaped structure, which laterally limits the flow of materials with good flowability, and at the same time supports the belt 5 to prevent it from falling due to heavy load. The stabilizing roller 8 is used to provide auxiliary support from the lower end of the belt 5, to counteract the lateral sway of the belt 5 during operation, and to improve the stability of the belt 5 conveying.

[0019] The stabilizing mechanism includes two sets of connecting plates 9. Connecting rods 10 are connected to the middle of one side of each connecting plate 9. Cylinders 11 are connected to the middle of one side of each connecting plate 9. Moving rods 12 are connected to one end of each cylinder 11. Sliding blocks 14 are slidably connected to one side of each moving rod 12. Connecting blocks 15 are connected to one end of each sliding block 14. Moving blocks 16 are connected to one end of each connecting block 15. A tension roller 18 is rotatably connected between the two moving blocks 16. The lower end of the tension roller 18 contacts the lower end of the inner wall of the belt 5. One end of each connecting rod 10 is inclined. One end of each cylinder 11 extends through to one side of each connecting plate 9. The two moving rods 12... The two guide rods are connected to the sides, with one end of each guide rod extending through to one side of the two connecting plates 9. Each of the two connecting plates 9 has a guide opening corresponding to the two guide rods. The two guide rods are located inside the two guide openings. Each of the two moving rods 12 has a groove 13 on one side. The two sliders 14 slide inside the two grooves 13. The cross-sectional shape of the grooves 13 and the cross-sectional shape of the sliders 14 are both convex. The cross-sectional shape of the two moving blocks 16 is an inverted I-shaped structure. Each of the two connecting rods 10 has a moving groove 17 on one side corresponding to the two moving blocks 16. The two moving blocks 16 slide inside the two moving grooves 17. The connecting plate 9 is equipped with a cylinder 11 and a connecting rod 10. The connecting rod 10 has a moving groove 17 and supports a moving block 16. Its inclination is set to provide a trajectory for the inclined sliding of the moving block 16. The cylinder 11 pushes the moving rod 12 to make linear motion. The moving rod 12 drives the slider 14 to move synchronously. The guide rod and the guide port cooperate to limit the movement direction of the moving rod 12, ensuring that the moving rod 12 only makes horizontal linear motion and avoids deviation. The sliding groove 13 cooperates with the convex slider 14 to limit the movement trajectory of the slider 14, so that the slider 14 can only slide along the length direction of the sliding groove 13, preventing the slider 14 from detaching from the moving rod 12. The connecting block 15 connects the slider 14 and the moving block 16 to realize the power transmission between the two. The inverted I-shaped moving block 16 cooperates with the moving groove 17 to convert the linear motion of the slider 14 into inclined sliding along the moving groove 17, thereby driving the tension roller 18 to rise and fall. The tension roller 18 contacts the inner wall of the belt 5 and adjusts the tension of the belt 5 by rising and falling, suppressing the vibration of the belt 5.

[0020] The buffer mechanism includes mounting rods 19, of which there are two sets. Two cylinders 20 are connected to both sides of the outer wall of each mounting rod 19, of which there are four cylinders 20. One side of each cylinder 20 is connected to one side of two connecting rods 10. A swing mechanism is connected inside each cylinder 20. Swing rods 25 are connected to both sides of the outer wall of each mounting rod 19. Two swing rods 25 are rotatably connected to two other swing rods 25. The lower ends of the two swing rollers 26 are connected to the lower ends of the inner walls of the belt 5. One side of each swing mechanism is connected to one side of each swing rod 25. The swing mechanism includes fixed blocks 21, of which there are two sets. The fixed blocks 21 are connected to the inner walls of the cylinder 20 on both sides. A sliding rod 22 is connected between the two fixed blocks 21. The sliding rod 22 is semi-circular in shape. A buffer block 23 is slidably connected to the middle of the outer wall of the sliding rod 22. Buffer springs 24 are connected to both sides of the buffer block 23. The two buffer springs 24 are respectively sleeved on the outer walls of the sliding rod 22. One end of the two buffer springs 24 is connected to one side of the two fixed blocks 21. A stabilizing rod is connected to the middle of one side of the buffer block 23. One end of the two stabilizing rods extends through to the corresponding side of the cylinder 20. One end of the stabilizing rod is connected to one side of the swing rod 25. A stabilizing groove is opened in the cylinder 20 corresponding to the stabilizing rod. The stabilizing rod slides inside the stabilizing groove. Mounting rod 19 mounts cylinder 20 and swing rod 25. Cylinder 20 protects internal components from external interference. The swing mechanism absorbs the vibration energy of belt 5 to achieve a buffering function. Swing rod 25 transmits the vibration received by buffer roller 26 to the swing mechanism. Buffer roller 26 is used to contact the inner wall of belt 5, directly bearing the vibration and impact of belt 5 and transmitting force to swing rod 25. Fixing block 21 is used to fix slide rod 22 to ensure the stable position of slide rod 22 inside cylinder 20. Semi-circular slide rod 22 is used to provide a sliding trajectory for buffer block 23, adapting to the swing direction of stabilizer. Buffer block 23 is used to connect stabilizer and buffer spring 24, converting the force transmitted by stabilizer into compression or tension on buffer spring 24. Buffer spring 24 absorbs vibration energy through elastic deformation and then counteracts the displacement of buffer block 23 through reaction force to achieve a buffering effect. Stabilizer connects buffer block 23 and swing rod 25. Stabilizer groove is used to limit the movement direction of stabilizer to ensure that it slides along the arc trajectory and avoids deviation.

[0021] Working principle: When using the device, the drive motor drives the rotating roller 4 to rotate. The rotating roller 4 drives the belt 5 to circulate through friction, realizing the continuous conveying of coke. During this stage, the idler rollers 7 are symmetrically tilted and raised on both sides of the belt 5 in the width direction, so that the bearing section of the belt 5 naturally forms a V-shaped structure. The inclined surfaces on both sides can be used to form a lateral limit on the coke with good flowability, preventing the coke from shifting and accumulating towards the edge of the belt during conveying. At the same time, the idler rollers 7 provide uniform upward support for the belt 5, preventing the belt 5 from sagging in the middle due to the weight of the coke. The stabilizing roller 8 is set against the lower surface of the belt 5, which can further counteract the lateral sway of the belt 5 during operation and reduce the risk of lateral deviation.

[0022] When the loader feeds material onto belt 5, the good fluidity and uneven feeding of coke can easily cause sudden changes in local tension on belt 5, resulting in belt vibration. At this time, the stabilizing mechanism is activated, and cylinder 11 outputs thrust according to the tension change of belt 5, pushing the moving rod 12 to move. Since the convex groove 13 on one side of the moving rod 12 is precisely matched with the slider 14, the slider 14 will move linearly synchronously with the moving rod 12. Furthermore, since the slider 14 is rigidly connected to the inverted I-shaped moving block 16 through the connecting block 15, the linear movement of the slider 14 will drive the moving block 16 to slide along the inclined trajectory of the moving groove 17. During this process, the inclined structure of the moving groove 17 causes the moving block 16 to move horizontally along with the moving rod 12 while simultaneously generating vertical displacement. The vertical displacement of the moving block 16 is directly transmitted to the tension roller 18, ultimately achieving the up-and-down movement of the tension roller 18 to adjust the tension of the belt 5. When the tension of the belt 5 is insufficient, the tension roller 18 presses down on the lower end of the inner wall of the belt 5 to increase the local tension. When the tension of the belt 5 is too high, the tension roller 18 retracts upward to release some tension, matching the dynamic tension requirements of the belt 5 in real time and suppressing the shaking caused by tension fluctuations from the root.

[0023] When coke falls onto the belt 5 or the belt 5 passes the roller 4 for reversal, it will generate instantaneous impact vibration, which can easily aggravate belt shaking. At this time, the buffer mechanism is activated, and the vibration of the belt 5 is transmitted to the buffer roller 26 that is attached to its lower surface, causing the buffer roller 26 to swing slightly up and down, which drives the swing rods 25 at both ends to swing synchronously. The stabilizing rod on one side of the swing rod 25 slides along the stabilizing groove of the cylinder 20 and pushes the buffer block 23 to move along the semi-circular slide bar 22, squeezing the buffer springs 24 on both sides of the slide bar 22. The buffer springs 24 absorb the impact energy through elastic deformation and then offset the displacement of the buffer block 23 through the reaction force, so that the buffer roller 26 quickly returns to its original position, thereby reducing the vibration amplitude of the belt 5 and avoiding coke spillage or belt wear caused by high-frequency shaking.

[0024] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A pressure belt anti-jumping device, comprising a base plate (1), characterized in that, Support frames (2) are evenly connected to both sides of the upper end of the base plate (1). Support blocks (3) are connected to both sides of the upper end of the two support frames (2). Rollers (4) are rotatably connected between the two support blocks (3) and the other two support blocks (3). Belts (5) are connected to the outer walls of the two rollers (4). The two rollers (4) are connected by a transmission belt (5). A stabilizing mechanism is connected to the upper part of one side of the two support frames (2). The stabilizing mechanism includes connecting plates (9). There are two sets of connecting plates (9). A connecting plate is connected to the middle of one side of the two connecting plates (9). The connecting rod (10) has a cylinder (11) connected to the middle of one side of the two connecting plates (9). One end of the two cylinders (11) is connected to a moving rod (12). One side of the two moving rods (12) is slidably connected to a slider (14). One end of the two sliders (14) is connected to a connecting block (15). One end of the two connecting blocks (15) is connected to a moving block (16). A tension roller (18) is rotatably connected between the two moving blocks (16). The lower end of the tension roller (18) contacts the lower end of the inner wall of the belt (5). A buffer mechanism is connected between the two connecting rods (10).

2. The anti-jumping device for a pressure belt according to claim 1, characterized in that, The upper end of the base plate (1) is connected to the two sides of the belt (5) and the upper end of the multiple connecting frames (6) is connected to the rollers (7). There are six sets of rollers (7). The upper ends of the multiple rollers (7) are in contact with the upper sides of the inner wall of the belt (5). The multiple rollers (7) are arranged in an inclined shape. The lower part of three of the connecting frames (6) and the other three connecting frames (6) is connected to the stabilizing rollers (8). The upper end of the stabilizing rollers (8) is in contact with the lower end of the belt (5).

3. The anti-jumping device for a pressure belt according to claim 1, characterized in that, One end of each of the two connecting rods (10) is inclined. One end of each of the two cylinders (11) extends through to one side of each of the two connecting plates (9). One side of each of the two moving rods (12) is connected to a guide rod. One end of each of the two guide rods extends through to one side of each of the two connecting plates (9). Guide openings are provided at each of the two connecting plates (9) corresponding to the two guide rods. The two guide rods are located inside the two guide openings respectively.

4. The anti-jumping device for a pressure belt according to claim 1, characterized in that, Each of the two moving rods (12) has a groove (13) on one side. The two sliders (14) slide inside the two grooves (13) respectively. The cross-sectional shape of the groove (13) and the cross-sectional shape of the slider (14) are both convex. The cross-sectional shape of the two moving blocks (16) is an inverted I-shaped structure. Each of the two connecting rods (10) has a moving groove (17) on one side corresponding to the two moving blocks (16). The two moving blocks (16) slide inside the two moving grooves (17) respectively.

5. The anti-jumping device for a pressure belt according to claim 1, characterized in that, The buffer mechanism includes mounting rods (19), and there are two sets of mounting rods (19). Two cylinders (20) are connected to both sides of the outer wall of the two mounting rods (19). There are four cylinders (20). One side of each of the four cylinders (20) is connected to one side of two connecting rods (10). A swing mechanism is connected inside each of the cylinders (20). Swing rods (25) are connected to both sides of the outer wall of the two mounting rods (19). Two swing rods (25) are rotatably connected to two other swing rods (25). The lower ends of the two buffer rollers (26) are connected to the lower ends of the inner wall of the belt (5). One side of each swing mechanism is connected to one side of each swing rod (25).

6. The anti-jumping device for a pressure belt according to claim 5, characterized in that, The swing mechanism includes fixed blocks (21), and there are two sets of fixed blocks (21). The two fixed blocks (21) are connected to the inner walls of the cylinder (20) on both sides respectively. A sliding rod (22) is connected between the two fixed blocks (21). The sliding rod (22) is in the shape of a semi-circular arc structure. A buffer block (23) is slidably connected to the middle of the outer wall of the sliding rod (22). Buffer springs (24) are connected to both sides of the buffer block (23). The two buffer springs (24) are respectively sleeved on both sides of the outer wall of the sliding rod (22). One end of the two buffer springs (24) is connected to one side of the two fixed blocks (21) respectively.

7. The anti-jumping device for a pressure belt according to claim 6, characterized in that, A stabilizing rod is connected to the middle of one side of the buffer block (23). One end of the two stabilizing rods extends through to the corresponding side of the cylinder (20). One end of the stabilizing rod is connected to the side of the swing rod (25). A stabilizing groove is opened at the cylinder (20) corresponding to the stabilizing rod. The stabilizing rod slides inside the stabilizing groove.

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