Auxiliary support for mounting a travelling wheel of a crane

Abstract

The utility model discloses a kind of auxiliary support for crane running wheel installation, it is related to crane running wheel installation technical field.The utility model includes support mechanism, the support mechanism is used to clamp and support crane running wheel, the support mechanism includes gear wheel and rectangular box body;The right side of the front of gear wheel is engaged with gear wheel No.2, the top of gear wheel No.2 is provided with several clamping blocks;The bottom center of the inside of rectangular box body is rotatably connected with motor No.1.The utility model is fixed component by setting, specifically is by gear wheel No.2 rotates gear wheel, makes gear wheel drive several clamping blocks to gather to center, and clamping block is clamped to running wheel, so that it is fixed on fixed component, prevent running wheel from being disturbed by external factors and rolling, avoid the waste of time caused by re-deployment, further guarantee the installation progress of running wheel.

Description

Technical Field

[0001] This utility model belongs to the field of crane traveling wheel installation technology, and in particular relates to an auxiliary bracket for crane traveling wheel installation. Background Technology

[0002] Crane travel wheels are an important component of cranes, primarily used to support and move the crane's overall structure. They are typically made of wear-resistant materials, capable of withstanding heavy loads and wear under various working conditions. The design of the travel wheels includes tires, bearings, and support structures to ensure smooth rolling and good grip on the ground. The function of crane travel wheels is not limited to moving equipment; they also help distribute loads, improving operational stability and safety. Depending on the type of crane, the size and material of the travel wheels may vary to meet specific working environments and load requirements. Tires are a crucial component of the travel wheels, but their positioning effect is limited. This makes tires susceptible to slippage during installation due to external factors such as collisions, causing them to deviate from the installation area and requiring redeployment to continue installation, thus affecting the installation progress. Therefore, we propose an auxiliary bracket for crane travel wheel installation. Utility Model Content

[0003] The purpose of this utility model is to provide an auxiliary bracket for installing crane traveling wheels. By setting a fixing component, specifically by rotating gear one through gear two, gear one drives several clamping blocks to converge towards the center, and the clamping blocks clamp the traveling wheel, fixing it to the fixing component. This prevents the traveling wheel from rolling due to external factors, avoiding the waste of time caused by redeployment, and thus ensuring the installation progress of the traveling wheel. It solves the problem that while tires are an important component of traveling wheels, the positioning effect of tires is limited. This makes tires prone to slippage due to external factors such as collisions during installation, causing the tires to deviate from the installation area and requiring redeployment to continue installation, thereby affecting the installation progress of the traveling wheels.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution: This utility model relates to an auxiliary bracket for mounting crane traveling wheels, comprising a support mechanism for clamping and supporting the crane traveling wheels. The support mechanism includes a first gear and a rectangular box. A second gear meshes with the right side of the front of the first gear. Several clamping blocks are arranged directly above the second gear. A first motor is rotatably connected to the bottom center of the interior of the rectangular box. The outer wall of the first motor has external threads, and a sliding block is sleeved around the outer wall of the first motor. Several clamping blocks are arranged in a circular arrangement around the first gear. The center of each sliding block has an internal thread, and the sliding block is threaded to a lead screw.

[0005] Furthermore, the support mechanism includes a fixing component for positioning and clamping the traveling wheel to prevent it from rolling during installation, and an adjusting component for adjusting the angle of the traveling wheel to facilitate installation and other operations by the worker. The adjusting component is located directly below the fixing component, and the top of the adjusting component abuts against the bottom of the fixing component.

[0006] Furthermore, the fixing component includes a pad, and the first gear is disposed at the center inside the pad. The tops of both the first and second gears are rotatably connected to the inner top wall of the pad. A support plate is disposed directly below the bottom of the first gear. The side of the support plate near the first gear is circular, and the side of the support plate near the inner wall of the pad is rectangular. The outer walls of the front and back of the rectangular portion of the support plate are mounted on the inner wall of the pad. By setting the meshing connection between the first and second gears, the second gear can drive the first gear to rotate in the opposite direction when rotating. The center of the circular portion of the support plate is penetrated by the bottom of the second gear, and the bottom of the second gear extends downward and is rotatably connected to the part of the support plate that is penetrated.

[0007] Furthermore, a first motor is installed directly below the second gear. The top of the first motor is mounted at the center of the bottom outer wall of the circular part of the support plate. The center of the top output end of the first motor and the center of the bottom output end of the second gear are on the same horizontal reference line. The top output end of the first motor is mounted at the center of the bottom outer wall of the second gear via a coupling. Several J-shaped arc grooves are formed at the center of the top outer wall of the first gear. These J-shaped arc grooves extend downward and penetrate the bottom outer wall of the first gear. By setting up the first motor, it can output power upward and drive the second gear to rotate through the coupling mounted at the top output end of the first motor. The several J-shaped arc grooves are all arranged in a J-shape and are arranged in a circle around the first gear.

[0008] Furthermore, a plurality of X-shaped straight grooves are formed at the center of the top outer wall of the pad. The cross-section of each of the X-shaped straight grooves is X-shaped. A slider is slidably connected within each of the X-shaped straight grooves. The outer wall of each slider is slidably connected to the inner wall of the X-shaped straight groove. The X-shaped straight grooves provide guidance for the sliding of the slider, allowing it to slide along the inner wall of the X-shaped straight groove. The bottom of the slider is a round rod, and the round rod at the bottom of the slider extends downward into the interior of the J-shaped arc groove. The outer wall of the round rod at the bottom of the slider is slidably connected to the inner wall of the J-shaped arc groove.

[0009] Furthermore, the adjustment assembly includes a box top cover, which is located directly above the top of the rectangular box. The box top cover is inclined, with the inclination direction extending from the bottom of the front to the top of the back. A shaped protrusion is installed at the center of the outer wall of the front of the rectangular box, and the top of the shaped protrusion is rotatably connected to the bottom of the front of the rectangular box. The lead screw is located at the bottom of the interior of the rectangular box, and its front and back sides penetrate the rectangular box and extend outward. By setting the lead screw, it can drive the sliding block to slide forward or backward through the external thread on the outer wall. In turn, the sliding block drives the connecting rods rotatably connected to its left and right sides to move. The outer wall of the lead screw is rotatably connected to the inner wall of the rectangular box through which it is penetrated. Sliding rods are provided on the left and right sides of the lead screw, and both sliding rods are cylindrical.

[0010] Furthermore, the two sliding rods are horizontally mirrored with respect to the lead screw as the center. The front and back outer walls of the sliding rods are mounted on the inner wall of the rectangular box. Both sliding rods penetrate the outer wall at the center of the sliding block. The inner wall of the two sliding blocks at the penetration point is slidably connected to the outer wall of the sliding rod. A second motor is installed at the center of the back outer wall of the lead screw. The output end of the second motor is on the same horizontal reference line as the lead screw. The front output end of the second motor is mounted to the center of the back outer wall of the lead screw via a coupling. The second motor and the first motor are both YE4-80M1-2 series three-phase asynchronous motors, and both the second motor and the first motor are equipped with SINAMICS-V20 frequency converters. A support block is provided on the front side of the top of the sliding block. The inclination angle of the support block is equal to that of the top cover of the box. The top outer wall of the support block is mounted on the bottom outer wall of the top cover of the box.

[0011] Furthermore, connecting rods are rotatably connected to the left and right sides of the support block. The two connecting rods are horizontally mirrored about the support block. The bottom back of the two support blocks is rotatably connected to the outer side wall of the sliding block. A U-shaped cover plate is provided directly above the top of the lead screw and the sliding rod. The outer wall of the U-shaped cover plate is installed on the inner wall of the rectangular box. The U-shaped cover plate is U-shaped. The front and back of the top of the U-shaped cover plate are both protruding. Straight grooves are opened on the left and right sides of the top outer wall of the U-shaped cover plate. The two straight grooves are horizontally mirrored about the U-shaped cover plate. The connecting rod is located in the groove of the straight groove.

[0012] This utility model has the following beneficial effects: 1. This utility model sets up a fixing component, specifically by rotating the first gear through the second gear, causing the first gear to drive several clamping blocks to converge towards the center, and clamping the walking wheel through the clamping blocks, thus fixing it to the fixing component. This prevents the walking wheel from rolling due to external factors, avoids the waste of time caused by redeployment, and ensures the installation progress of the walking wheel.

[0013] 2. This utility model, by setting an adjustment component, specifically by rotating the lead screw counterclockwise, causes the sliding block sleeved on the outer wall to move forward through the external thread. Then, the connecting rods rotatably connected on both sides of the sliding block push the support block to flip forward. In this way, the angle of the traveling wheel can be adjusted by the adjustment component, allowing the workers to work at a convenient angle for installation, thereby ensuring the installation progress of the traveling wheel.

[0014] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall front structure of this utility model; Figure 2 This is a schematic diagram of the overall rear structure of this utility model; Figure 3 This is a schematic diagram of the J-shaped arc groove structure of this utility model; Figure 4 This is a schematic diagram of the X-shaped straight groove structure of this utility model; Figure 5 This is a schematic cross-sectional view of the rectangular box body of this utility model.

[0017] The attached diagram lists the components represented by each number as follows: 1. Support mechanism; 11. Fixing component; 111. Pad; 1121. Gear No. 1; 1122. Gear No. 2; 113. Support plate; 114. Motor No. 1; 115. J-shaped arc groove; 116. X-shaped straight groove; 117. Slider; 118. Clamping block; 12. Adjustment component; 121. Rectangular box; 122. Box top cover; 123. Irregular protrusion; 124. Lead screw; 125. Slide rod; 126. Motor No. 2; 1271. Sliding block; 1272. Support block; 128. Connecting rod; 1291. U-shaped cover plate; 1292. Straight groove. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0019] Please see Figures 1-5 As shown, this utility model is an auxiliary bracket for mounting crane traveling wheels, including a support mechanism 1. The support mechanism 1 is used to clamp and support the crane traveling wheels. The support mechanism 1 includes a first gear 1121 and a rectangular box 121. A second gear 1122 is meshed on the right side of the front of the first gear 1121. Several clamping blocks 118 are arranged directly above the second gear 1122. A first motor 114 is rotatably connected to the bottom center of the interior of the rectangular box 121. The outer wall of the first motor 114 has external threads, and a sliding block 1 is sleeved around the outer wall of the first motor 114. 271, a number of clamping blocks 118 are arranged in a circle around the first gear 1121. The center of the sliding block 1271 is provided with an internal thread. The sliding block 1271 is threadedly connected to the lead screw 124. The support mechanism 1 includes a fixing component 11, which is used to position and clamp the traveling wheel to prevent the traveling wheel from rolling during installation. An adjusting component 12 is used to adjust the included angle of the traveling wheel to facilitate the worker to perform installation and other operations. The adjusting component 12 is located directly below the fixing component 11, and the top of the adjusting component 12 abuts against the bottom of the fixing component 11. The fixing assembly 11 includes a pad 111, a first gear 1121 disposed at the center inside the pad 111, the tops of both the first gear 1121 and the second gear 1122 being rotatably connected to the inner top wall of the pad 111, and a support plate 113 disposed directly below the bottom of the first gear 1121. The side of the support plate 113 near the first gear 1121 is circular, and the side of the support plate 113 near the inner wall of the pad 111 is rectangular. The outer walls of the front and back of the rectangular portion of the support plate 113 are mounted on the inner wall of the pad 111. The center of the circular portion of the support plate 113 is located at the bottom of the second gear 1122. The second gear 1122 extends downwards from the bottom and rotatably connects to the through-hole of the support plate 113. A first motor 114 is positioned directly below the second gear 1122. The top of the first motor 114 is mounted at the center of the bottom outer wall of the circular portion of the support plate 113. The center of the top output end of the first motor 114 is on the same horizontal reference line as the center of the bottom output end of the second gear 1122. The top output end of the first motor 114 is mounted to the center of the bottom outer wall of the second gear 1122 via a coupling. Several J-shaped arc grooves are formed at the center of the top outer wall of the first gear 1121. 15. Several J-shaped arc grooves 115 extend downwards and penetrate the bottom outer wall of the first gear 1121. These J-shaped arc grooves 115 are arranged in a J-shape and are arranged in a circular pattern around the first gear 1121. Several X-shaped straight grooves 116 are formed at the center of the top outer wall of the pad 111. The cross-section of each X-shaped straight groove 116 is X-shaped. Sliding sliders 117 are slidably connected within each X-shaped straight groove 116. The outer walls of the sliding sliders 117 are slidably connected to the inner walls of the X-shaped straight grooves 116. By setting the fixing component 11, [the following is possible:] The body rotates gear 1121 by gear 2 1122, causing gear 1121 to drive several clamping blocks 118 to converge towards the center. The clamping blocks 118 clamp the walking wheel and fix it to the fixed component 11, preventing the walking wheel from rolling due to external factors, avoiding redeployment and wasting time, and thus ensuring the installation progress of the walking wheel. The bottom of the slider 117 is set as a round rod, and the round rod part at the bottom of the slider 117 extends downward into the interior of the J-shaped arc groove 115. The outer wall of the round rod part at the bottom of the slider 117 is slidably connected to the inner wall of the J-shaped arc groove 115. The adjustment assembly 12 includes a box top cover 122, which is located directly above the top of the rectangular box 121. The box top cover 122 is inclined, extending from the bottom of the front to the top of the back. A shaped protrusion 123 is installed at the center of the outer wall of the front of the rectangular box 121, and the top of the shaped protrusion 123 is rotatably connected to the bottom of the front of the rectangular box 121. A lead screw 124 is located at the bottom inside the rectangular box 121, penetrating the rectangular box 121 on both the front and back and extending outwards. The outer wall of the lead screw 124 is rotatably connected to the inner wall of the rectangular box 121 through which it is penetrated. Slide rods 125 are provided on the left and right sides of the lead screw 124. Both slide rods 125 are cylindrical, and are horizontally mirrored about the center of the lead screw 124. The front and back outer walls of the slide rods 125 are mounted on the inner wall of the rectangular box 121. Both slide rods 125 penetrate the outer wall of the center of the sliding block 1271, and the inner walls of the penetrated portions of the two sliding blocks 1271 are slidably connected to the outer walls of the slide rods 125. A second motor 126 is located at the center of the back outer wall of the lead screw 124. The output end of the second motor 126 is on the same horizontal reference line as the lead screw 124. The front output end of the second motor 126 is mounted to the center of the back outer wall of the lead screw 124 via a coupling. A support block 1272 is located on the front side of the top of the sliding block 1271. The tilt angle of the support block 1272 is equal to that of the box top cover 122. The top outer wall of the support block 1272 is installed on the bottom outer wall of the box top cover 122. The left and right sides of the support block 1272 are rotatably connected to the connecting rods 128. The two connecting rods 128 are horizontally mirrored about the support block 1272. The bottom back of the two support blocks 1272 is rotatably connected to the side outer wall of the sliding block 1271. A U-shaped cover plate 1291 is provided directly above the top of the lead screw 124 and the sliding rod 125. The outer wall of the U-shaped cover plate 1291 is installed on the inner wall of the rectangular box 121. The U-shaped cover plate 1291 is U-shaped. The front and back of the top of the U-shaped cover plate 1291 are both raised. The U-shaped cover plate 1291 has straight grooves 1292 on the left and right sides of its top outer wall. By setting the adjustment component 12, specifically by rotating the screw 124 counterclockwise, the external thread drives the sliding block 1271 sleeved on the outer wall to move forward. Then, the connecting rod 128 connected to both sides of the sliding block 1271 pushes the support block 1272 to flip forward. In this way, the angle of the walking wheel can be adjusted by the adjustment component 12, so that the workers can work at a convenient angle for installation, thereby ensuring the installation progress of the walking wheel. The two straight grooves 1292 are set horizontally and mirror-imagely with the U-shaped cover plate 1291 as the center, and the connecting rod 128 is located in the groove of the straight groove 1292.

[0020] A specific application of this embodiment is as follows: The tire is placed flat at the top center of the pad 111. Then, the first motor 114 is started, causing its top output end to drive the second gear 1122 to rotate via a coupling. The second gear 1122 rotates and, through its outer wall meshing with the outer wall of the first gear 1121, drives the first gear 1121 to rotate. When the first gear 1121 rotates clockwise, it drives the four J-shaped arc grooves 115 to rotate, and through the J-shaped arc grooves 115, it pulls the four sliders 117 to slide. The tops of the four sliders 117 slide along the inner wall of the X-shaped straight groove 116, causing the clamping blocks 118 to shift. This allows the four clamping blocks 118 to converge towards the top center of the pad 111, and then clamp the tire from its outer wall, fixing it to the top center of the pad 111. The reverse is achieved when the first gear 1121 rotates counterclockwise, preventing misalignment during installation. To prevent the tire from sliding and interfering with the installation progress, the rectangular box 121 is then pushed and moved near the bearing using four casters at its bottom. Then, the second motor 126 is started, driving the lead screw 124 through a coupling. When the lead screw 124 rotates counterclockwise, it drives the sliding block 1271 to move forward via a threaded connection. The sliding block 1271 also moves along the sliding rod 125 during this movement, correcting its direction of movement and preventing it from deflecting and jamming. The sliding block 1271 then pushes the support block 1272 via the connecting rod 128, causing the support block 1272 to push the box top cover 122 to flip forward along the irregular protrusion 123. This allows adjustment of the angle between the tire and the bearing, enabling workers to complete the installation at a convenient angle. Finally, lubricant is applied to the outer wall of the bearing, and the bearing is then joined to the tire. It should be noted that the control of motor 114 and motor 126 in this application can both be achieved by using a program set in the control panel and inputting relevant parameters as needed for automated control. This control method can be implemented using existing technologies, such as PLC.

[0021] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0022] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the present utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the present utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. An auxiliary bracket for mounting the traveling wheels of a crane, characterized in that, include: Support mechanism (1), the support mechanism (1) is used to clamp and support the traveling wheels of the crane, the support mechanism (1) includes a first gear (1121) and a rectangular box (121). The first gear (1121) is meshed with the second gear (1122) on the right side of its front, and several clamping blocks (118) are arranged directly above the second gear (1122). A No. 1 motor (114) is rotatably connected to the bottom center of the interior of the rectangular box (121). The outer wall of the No. 1 motor (114) is provided with external threads, and a sliding block (1271) is sleeved around the outer wall of the No. 1 motor (114). Among them, several clamping blocks (118) are arranged in a circle around the first gear (1121), and the sliding block (1271) has an internal thread at the center, and the sliding block (1271) is threadedly connected to the lead screw (124).

2. The auxiliary bracket for mounting crane traveling wheels according to claim 1, characterized in that, The support mechanism (1) includes a fixing component (11) for positioning and clamping the walking wheel to prevent the walking wheel from rolling during installation; Adjustment component (12), the adjustment component (12) is used to adjust the included angle of the walking wheels so that workers can perform installation and other operations; The adjusting component (12) is located directly below the fixing component (11), and the top of the adjusting component (12) abuts against the bottom of the fixing component (11).

3. The auxiliary bracket for mounting crane traveling wheels according to claim 2, characterized in that, The fixing component (11) includes a pad (111), and the first gear (1121) is located at the center inside the pad (111). The tops of the first gear (1121) and the second gear (1122) are rotatably connected to the top inner wall of the pad (111). A support plate (113) is provided directly below the bottom of the first gear (1121). The side of the support plate (113) near the first gear (1121) is circular, and the side of the support plate (113) near the inner wall of the pad (111) is rectangular. The outer walls of the front and back of the rectangular part of the support plate (113) are installed on the inner wall of the pad (111). Wherein, the center of the circular part of the pallet (113) is penetrated by the bottom of the second gear (1122), and the bottom of the second gear (1122) extends downward and is rotatably connected to the part of the pallet (113) that is penetrated.

4. The auxiliary bracket for mounting crane traveling wheels according to claim 3, characterized in that, A motor (114) is located directly below the second gear (1122). The top of the first motor (114) is mounted at the center of the bottom outer wall of the circular part of the support plate (113). The center of the top output end of the first motor (114) and the center of the bottom output end of the second gear (1122) are on the same horizontal reference line. The top output end of the first motor (114) is mounted at the center of the bottom outer wall of the second gear (1122) through a coupling. Several J-shaped arc grooves (115) are opened at the center of the top outer wall of the first gear (1121). Several J-shaped arc grooves (115) extend downward and penetrate the bottom outer wall of the first gear (1121). Among them, several of the J-shaped arc grooves (115) are arranged in a J-shaped bend, and several of the J-shaped arc grooves (115) are arranged in a circle around the first gear (1121).

5. The auxiliary bracket for mounting crane traveling wheels according to claim 3, characterized in that, The top outer wall of the pad (111) has several X-shaped straight grooves (116) at its center. The cross-section of each X-shaped straight groove (116) is X-shaped. Each X-shaped straight groove (116) has a slider (117) slidably connected inside it. The outer wall of each slider (117) is slidably connected to the inner wall of the X-shaped straight groove (116). The bottom of the slider (117) is a round rod, and the round rod at the bottom of the slider (117) extends downward into the interior of the J-shaped arc groove (115). The outer wall of the round rod at the bottom of the slider (117) is slidably connected to the inner wall of the J-shaped arc groove (115).

6. The auxiliary bracket for mounting crane traveling wheels according to claim 2, characterized in that, The adjustment component (12) includes a box top cover (122), which is located directly above the top of the rectangular box (121). The box top cover (122) is inclined, and the inclined direction of the box top cover (122) extends from the bottom of the front to the top of the back. A shaped protrusion (123) is installed at the center of the outer wall of the front of the rectangular box (121). The top of the shaped protrusion (123) is rotatably connected to the bottom of the front of the rectangular box (121). The lead screw (124) is located at the bottom inside the rectangular box (121). The front and back of the lead screw (124) both penetrate the rectangular box (121) and extend outward. The outer wall of the lead screw (124) is rotatably connected to the inner wall of the rectangular box (121) through which it is penetrated. Slide rods (125) are provided on both the left and right sides of the lead screw (124), and both slide rods (125) are cylindrical.

7. The auxiliary bracket for mounting crane traveling wheels according to claim 6, characterized in that, The two slide rods (125) are arranged horizontally mirror images of the lead screw (124) with the lead screw (124) as the center. The front and back outer walls of the slide rods (125) are installed on the inner wall of the rectangular box (121). The two slide rods (125) penetrate the outer wall of the center of the sliding block (1271). The inner wall of the penetrating part of the two sliding blocks (1271) is slidably connected to the outer wall of the slide rod (125). A second motor (126) is provided at the center of the back outer wall of the lead screw (124). The output end of the second motor (126) is on the same horizontal reference line as the lead screw (124). The front output end of the second motor (126) is installed at the center of the back outer wall of the lead screw (124) through a coupling. Among them, a support block (1272) is provided on the front side of the top of the sliding block (1271). The tilt angle of the support block (1272) is equal to that of the top cover (122) of the box. The top outer wall of the support block (1272) is installed on the bottom outer wall of the top cover (122) of the box.

8. The auxiliary bracket for mounting crane traveling wheels according to claim 7, characterized in that, The support block (1272) is rotatably connected to the left and right sides of the support block (1272). The two connecting rods (128) are horizontally mirrored with the support block (1272) as the center. The bottom back of the two support blocks (1272) is rotatably connected to the outer side wall of the sliding block (1271). A U-shaped cover plate (1291) is provided directly above the top of the lead screw (124) and the slide rod (125). The outer wall of the U-shaped cover plate (1291) is installed on the inner wall of the rectangular box (121). The U-shaped cover plate (1291) is U-shaped. The front and back of the top of the U-shaped cover plate (1291) are both protruding. Straight grooves (1292) are opened on the left and right sides of the top outer wall of the U-shaped cover plate (1291). Among them, the two straight slots (1292) are horizontally mirrored with the U-shaped cover plate (1291) as the center, and the connecting rod (128) is located in the slot of the straight slot (1292).

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