Lifting machine for automobile maintenance

Abstract

The invention relates to the technical field of automobile maintenance, in particular to a lifting machine for automobile maintenance, which comprises bases and support plates, the support plates are fixed on the bases, two sides of each support plate are respectively provided with an outer groove and an inner groove, the two bases and the two support plates are arranged, one end, far away from the bases, of each support plate is fixedly connected with a top plate, and a cavity is formed in the top plate; the lifting mechanism is installed on the cavity formed in the top plate and the supporting plate, and the power output end of the lifting mechanism is connected with a bearing mechanism installed on the supporting plate; and the two safety rods are fixedly installed on the bearing mechanism, inserting grooves are formed in the two safety rods, and the safety rods correspond to safety mechanisms installed on the top plate. According to the lifting machine for automobile maintenance, an automobile can be lifted, free adjustment can be conducted according to the wheel track of the automobile, meanwhile, the automobile can be locked after being lifted to a certain height, the situation that the automobile falls under the action of the self weight is avoided, operation is easy, and practicability is high.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile maintenance, and in particular to a lift for automobile maintenance. Background Art

[0002] Car maintenance is a general term for car maintenance and repair. It involves using technical means to troubleshoot a malfunctioning car, identify the cause of the malfunction, and take specific measures to eliminate the malfunction and restore it to a certain performance and safety standard. Car maintenance includes both major and minor repairs. Major repairs refer to restorative repairs that repair or replace any part of the car (including basic parts) to restore the car to its perfect technical condition and completely (or nearly completely) restore the car's lifespan. Minor repairs, on the other hand, refer to operational repairs that replace or repair individual parts to ensure or restore the car's working ability. During the maintenance process, the bottom of a car is often difficult to repair. In this case, the car needs to be lifted. Although existing lifts can lift cars, there are still some problems. First, the current lifts cannot be freely adjusted according to the wheelbase of the car. Second, the current lifts are not locked after lifting the car to a certain height, and there is a risk of the car falling. Therefore, a car maintenance lift is needed to solve the above problems. Summary of the Invention

[0003] The purpose of the embodiments of the present invention is to provide a car maintenance lift, which aims to solve the following problems: existing lifts cannot be freely adjusted according to the wheelbase of the car and are not locked after lifting the car to a certain height.

[0004] The embodiment of the present invention is implemented as follows: a lift for automobile maintenance includes: a base and a support plate, the support plate is fixed on the base, the support plate is provided with an outer groove and an inner groove on both sides respectively, the base and the support plate are provided with two, the end of the support plate away from the base is fixedly connected to a top plate, and a cavity is provided in the top plate; a lifting mechanism is installed in the cavity provided in the top plate and the support plate, the power output end of the lifting mechanism is connected to a bearing mechanism installed on the support plate, the vehicle can be placed on the bearing mechanism, and the lifting mechanism is used to drive the vehicle to rise or fall through the bearing mechanism; a safety bar is fixedly installed on the bearing mechanism and is provided with two, the two safety bars are provided with slots, the safety bars correspond to the safety mechanisms installed on the top plate, and the power output end of the safety mechanism is used to be inserted into the slot provided in the safety bar to ensure the safety of automobile maintenance.

[0005] Preferably, the lifting mechanism includes: a driving component, which is installed in the cavity opened by the top plate, the power output end of the driving component is fixedly connected to a threaded column, the end of the threaded column away from the driving component is rotatably connected to a fixed plate fixed on the support plate, and a lifting plate is threadedly sleeved on the threaded column; a guide groove, which is fixedly set in an outer groove opened by the support plate, and a guide wheel installed on the lifting plate is slidably set in the guide groove; a reversing wheel, which is rotatably mounted on the support plate, and a steel wire rope is wound around the reversing wheel, one end of the steel wire rope is fixedly connected to the lifting plate, and the bearing mechanism is fixedly connected to the other end of the steel wire rope.

[0006] Preferably, the driving assembly includes: a first power member, which is fixedly installed in a cavity opened by the top plate, and the output shaft of the first power member is fixedly connected to the first bevel gear; a stabilizing sleeve, which is fixedly installed in the cavity opened by the top plate, and a linkage rod is rotatably provided on the stabilizing sleeve, and a second bevel gear meshing with the first bevel gear is fixed on the linkage rod, and a third bevel gear is fixed at both ends of the linkage rod; a rotating column, which is rotatably provided in the cavity opened by the top plate, the threaded column and the rotating column are fixedly connected, and a fourth bevel gear meshing with the third bevel gear is fixed on the rotating column.

[0007] Preferably, the bearing mechanism includes: two edge plates, which are fixedly connected to the power output end of the lifting mechanism, the edge plates are provided with slots, and the two edge plates are fixedly provided with reinforcement plates, and the safety rods are fixed to the reinforcement plates; a supporting assembly, which is installed on the edge plates and the reinforcement plates, and the vehicle can be placed on the supporting assembly for lifting and maintenance, and the supporting assembly can be adjusted to adapt to the wheelbase of different cars; an inclined ladder, which is fixedly installed on the edge plate, and the car can be driven onto the supporting assembly by the inclined ladder; a sliding column, both ends of which are fixedly connected to the inner wall of the inner groove provided on the support plate, and the sliding column is provided with a sliding sleeve fixedly connected to the edge plate.

[0008] Preferably, the supporting assembly includes: a screw rod, both ends of which are rotatably connected to the two reinforcement plates, a partition is fixedly provided in the middle of the screw rod, the screw rod threads on both sides of the partition rotate in opposite directions, and the ends of the screw rod are connected to a second power member installed on the reinforcement plate; a guide rod, both ends of which are fixedly connected to the inner wall of the slot opened in the edge plate, a guide block is sleeved on the guide rod, and a supporting plate threadedly connected to the screw rod is fixed on the guide block, and the supporting plates are arranged on both sides of the partition, and the car can be placed on the support plates for maintenance.

[0009] Preferably, the safety mechanism includes: a third power member, which is fixedly mounted on the lower side of the top plate, and the output shaft of the third power member is fixedly connected to a driving gear; a circular sleeve, which is fixed on the top plate, and a synchronization rod is rotatably arranged inside the circular sleeve, and a driven gear that meshes with the driving gear is fixed on the synchronization rod; a snap-in assembly, which is fixedly mounted on the top plate and connected to the end of the synchronization rod, and two snap-in assemblies are provided, and the power output end of the snap-in assembly is used to snap into the slot opened by the safety rod to ensure the safety of automobile maintenance.

[0010] Preferably, the snap-in assembly includes: a trough body, which is fixedly mounted on the top plate, a cavity is opened in the trough body, a linkage column is fixedly arranged in the middle of the cavity opened by the trough body, a linkage block is sleeved on the linkage column, and a pull rod is hinged on the linkage block; a threaded rod, which is rotatably mounted on the inner wall of one side of the cavity opened by the trough body and fixedly connected to the synchronization rod, and a threaded block is threadedly sleeved on the threaded rod; a cross rod, which is fixedly mounted on the inner wall of the other side of the cavity opened by the trough body and is arranged corresponding to the threaded rod, and a sleeve block is sleeved on the cross rod and is arranged corresponding to the threaded block; a hanging rod, which is provided with two and is respectively fixedly connected to the threaded block and the sleeve block, and the pull rod is hinged to the hanging rod; a sleeve rod, which is fixed on the inner wall of the cavity, a sleeve rod is sleeved with a sleeve fixedly connected to the hanging rod, and an insertion rod is fixed on the sleeve, and the insertion rod can be inserted into the slot opened by the safety rod.

[0011] The automobile maintenance lift provided by the present invention can not only lift the automobile, but also be freely adjusted according to the wheelbase of the automobile, thereby meeting the lifting requirements of different automobiles. At the same time, after the automobile is lifted to a certain height, it can be locked to prevent the automobile from falling under the action of its own weight. The operation is simple and the practicality is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a schematic diagram of a lift used for car maintenance.

[0013] Figure 2 Schematic diagram of the drive assembly of a car repair lift.

[0014] Figure 3 This is a schematic diagram of the carrying mechanism of a lift used for car maintenance.

[0015] Figure 4 This is a schematic diagram of the snap-in assembly of a car repair lift.

[0016] In the accompanying drawings: 1-base, 2-support plate, 3-top plate, 4-lifting mechanism, 5-carrying mechanism, 6-safety rod, 7-safety mechanism, 41-driving assembly, 42-threaded column, 43-fixed plate, 44-lifting plate, 45-guide groove, 46-guide wheel, 47-reversing wheel, 48-wire rope, 411-first power member, 412-first bevel gear, 413-stabilizing sleeve, 414-linking rod, 415-second bevel gear, 416-third bevel gear, 417-rotating column, 418-fourth bevel gear, 51-edge plate, 52-reinforcement plate, 53-supporting assembly, 54 - inclined ladder, 55- sliding column, 56- sliding sleeve, 531- screw rod, 532- partition, 533- second power member, 534- guide rod, 535- guide block, 536- supporting plate, 71- third power member, 72- driving gear, 73- round sleeve, 74- synchronization rod, 75- driven gear, 76- snap-in assembly, 761- trough body, 762- linkage column, 763- linkage block, 764- pull rod, 765- threaded rod, 766- threaded block, 767- cross bar, 768- sleeve block, 769- suspension rod, 7610- sleeve rod, 7611- sleeve, 7612- plug rod. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0018] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0019] See also Figure 1 An embodiment of the present invention provides a car maintenance lift, comprising: The base 1 and the support plate 2, the support plate 2 is fixed on the base 1, and the support plate 2 is provided with an outer groove and an inner groove on both sides respectively. The base 1 and the support plate 2 are provided with two, and the end of the support plate 2 away from the base 1 is fixedly connected to the top plate 3, and a cavity is provided in the top plate 3; a lifting mechanism 4, which is installed on the cavity opened in the top plate 3 and the support plate 2, the power output end of the lifting mechanism 4 is connected to the supporting mechanism 5 installed on the support plate 2, and the vehicle can be placed on the supporting mechanism 5, and the lifting mechanism 4 is used to drive the vehicle up or down through the supporting mechanism 5; a safety rod 6, which is fixedly installed on the supporting mechanism 5 and is provided with two, the two safety rods 6 are provided with slots, and the safety rod 6 corresponds to the safety mechanism 7 installed on the top plate 3, and the power output end of the safety mechanism 7 is used to be inserted into the slot opened by the safety rod 6 to ensure the safety of automobile maintenance.

[0020] When using the car maintenance lift, first, according to the wheelbase length of the car to be repaired, open the carrying mechanism 5 and adjust the carrying mechanism 5 to a state suitable for repairing the car. Then, place the car on the carrying mechanism 5 and open the lifting mechanism 4. The lifting mechanism 4 can drive the car on the carrying mechanism 5 to move upward, thereby lifting the car. When the carrying mechanism 5 moves upward, it can also drive the safety rod 6 to move upward. After the safety rod 6 is inserted into the safety mechanism 7, open the safety mechanism 7. The power output end of the safety mechanism 7 can be inserted into the slot opened by the safety rod 6, thereby locking the carrying mechanism 5 and ensuring the safety of the car during repair.

[0021] like Figure 1 As shown, as a preferred embodiment of the present invention, the lifting mechanism 4 includes: a driving component 41, which is installed in the cavity opened by the top plate 3, the power output end of the driving component 41 is fixedly connected to a threaded column 42, and the end of the threaded column 42 away from the driving component 41 is rotatably connected to a fixed plate 43 fixed on the support plate 2, and a lifting plate 44 is threadedly sleeved on the threaded column 42; a guide groove 45, which is fixedly set in an outer groove opened by the support plate 2, and a guide wheel 46 installed on the lifting plate 44 is slidably set in the guide groove 45; a reversing wheel 47, which is rotatably installed on the support plate 2, and a wire rope 48 is wound around the reversing wheel 47, one end of the wire rope 48 is fixedly connected to the lifting plate 44, and the carrying mechanism 5 is fixedly connected to the other end of the wire rope 48.

[0022] like Figure 2 As shown, as a preferred embodiment of the present invention, the driving assembly 41 includes: a first power member 411, which is fixedly installed in the cavity opened by the top plate 3, and the output shaft of the first power member 411 is fixedly connected to the first bevel gear 412; a stabilizing sleeve 413, which is fixedly installed in the cavity opened by the top plate 3, and a linkage rod 414 is rotatably provided on the stabilizing sleeve 413, and a second bevel gear 415 engaged with the first bevel gear 412 is fixed on the linkage rod 414, and a third bevel gear 416 is fixedly provided at both ends of the linkage rod 414; a rotating column 417, which is rotatably provided in the cavity opened by the top plate 3, the threaded column 42 and the rotating column 417 are fixedly connected, and a fourth bevel gear 418 engaged with the third bevel gear 416 is fixed on the rotating column 417.

[0023] When controlling the carrying mechanism 5 to move upward, the first power member 411 is turned on. The first power member 411 is specifically a motor. The output shaft of the first power member 411 drives the first bevel gear 412 to rotate. The rotation of the first bevel gear 412 drives the second bevel gear 415, the linkage rod 414 and the third bevel gear 416 to rotate in the stabilizing sleeve 413. The rotation of the third bevel gear 416 can drive the fourth bevel gear 418, the rotating column 417 and the threaded column 42 to rotate stably on the top plate 3. The rotation of the threaded column 42 can enable the lifting plate 44 to drive the guide wheel 46 to move downward along the guide groove 45. The downward movement of the lifting plate 44 can cause the wire rope 48 to pull the carrying mechanism 5 upward through the reversing wheel 47, and the carrying mechanism 5 can drive the car thereon to move upward.

[0024] like Figure 3 As shown, as a preferred embodiment of the present invention, the supporting mechanism 5 includes: an edge plate 51, two of which are provided and fixedly connected to the power output end of the lifting mechanism 4, the edge plate 51 is provided with a slot, and the two edge plates 51 are fixedly provided with a reinforcement plate 52, and the safety bar 6 is fixed on the reinforcement plate 52; a supporting assembly 53, which is installed on the edge plate 51 and the reinforcement plate 52, and the vehicle can be placed on the supporting assembly 53 for lifting and maintenance, and the supporting assembly 53 can be adjusted to adapt to the wheelbase of different cars; an inclined ladder 54, which is fixedly installed on the edge plate 51, and the car can travel to the supporting assembly 53 by the inclined ladder 54; a sliding column 55, both ends of which are fixedly connected to the inner wall of the inner groove opened by the support plate 2, and the sliding column 55 is provided with a sliding sleeve 56 fixedly connected to the edge plate 51.

[0025] like Figure 3 As shown, as a preferred embodiment of the present invention, the supporting assembly 53 includes: a screw rod 531, both ends of which are rotatably connected to the two reinforcement plates 52, a partition 532 is fixedly provided in the middle of the screw rod 531, the screw rod 531 on both sides of the partition 532 has opposite thread rotation directions, and the end of the screw rod 531 is connected to a second power member 533 installed on the reinforcement plate 52; a guide rod 534, both ends of which are fixedly connected to the inner wall of the groove opened by the edge plate 51, a guide block 535 is sleeved on the guide rod 534, and a supporting plate 536 threadedly connected to the screw rod 531 is fixed on the guide block 535, and the supporting plate 536 is arranged on both sides of the partition 532, and the car can be placed on the supporting plate 536 for maintenance.

[0026] The car can be moved from the inclined ladder 54 to the supporting plate 536 via the edge plate 51. When adjusting the distance between the two supporting plates 536, the second power member 533 is turned on. The second power member 533 is specifically a motor. The output shaft of the second power member 533 drives the screw rod 531 to rotate. The rotation of the screw rod 531 can make the supporting plates 536 and the guide blocks 535 of the partition 532 approach or move away from each other along the guide rod 534, thereby realizing the adjustment of the distance between the two supporting plates 536, and then can adapt to cars with different wheelbases. When lifting the car, the lifting mechanism 4 can drive the edge plate 51 and the sliding column 55 to move upward along the sliding sleeve 56, thereby realizing the lifting of the car.

[0027] like Figure 1 As shown, as a preferred embodiment of the present invention, the safety mechanism 7 includes: a third power member 71, which is fixedly mounted on the lower side of the top plate 3, and the output shaft of the third power member 71 is fixedly connected to the driving gear 72; a circular sleeve 73, which is fixed on the top plate 3, and a synchronization rod 74 is rotatably provided in the circular sleeve 73, and a driven gear 75 is fixed on the synchronization rod 74 to engage with the driving gear 72; a snap-in assembly 76, which is fixedly mounted on the top plate 3 and connected to the end of the synchronization rod 74, and two snap-in assemblies 76 are provided, and the power output end of the snap-in assembly 76 is used to snap into the slot opened by the safety rod 6 to ensure the safety of automobile maintenance.

[0028] As the supporting mechanism 5 is lifted upward, the supporting mechanism 5 can drive the safety rod 6 to move upward until the slot opened by the safety rod 6 is flush with the power output end of the card-in assembly 76. Then, the third power member 71 is turned on. The third power member 71 is specifically a motor. The third power member 71 drives the driving gear 72 to rotate. The driving gear 72 drives the driven gear 75 and the synchronization rod 74 to rotate stably in the circular sleeve 73. The rotation of the synchronization rod 74 can drive the card-in assembly 76 to be snapped into the slot. Due to the restriction of the card-in assembly 76, the supporting mechanism 5 cannot move downward, thereby ensuring the safety of automobile maintenance.

[0029] like Figure 4As shown, as a preferred embodiment of the present invention, the snap-in assembly 76 includes: a groove body 761, which is fixedly mounted on the top plate 3, a cavity is opened in the groove body 761, a linkage column 762 is fixedly set in the middle of the cavity opened by the groove body 761, a linkage block 763 is sleeved on the linkage column 762, and a pull rod 764 is hinged on the linkage block 763; a threaded rod 765, which is rotatably mounted on the inner wall of one side of the cavity opened by the groove body 761 and is fixedly connected to the synchronization rod 74, and a threaded block 766 is threadedly sleeved on the threaded rod 765; a cross bar 767, which is fixedly mounted on the groove body On the inner wall of the other side of the cavity opened by 761 and corresponding to the threaded rod 765, a sleeve block 768 corresponding to the threaded block 766 is provided on the cross bar 767; two suspension rods 769 are provided and are respectively fixedly connected to the threaded block 766 and the sleeve block 768, and the pull rod 764 and the suspension rod 769 are hinged; a sleeve rod 7610 is fixed on the inner wall of the cavity, and a sleeve 7611 fixedly connected to the suspension rod 769 is provided on the sleeve rod 7610, and an insertion rod 7612 is fixed on the sleeve 7611, and the insertion rod 7612 can be inserted into the slot opened by the safety rod 6.

[0030] The rotation of the synchronization rod 74 drives the threaded rod 765 to rotate. The rotation of the threaded rod 765 can move the threaded block 766 and the suspension rod 769 on one side. The movement of the suspension rod 769 on one side can cause the pull rod 764 on one side to push the linkage block 763 downward along the linkage column 762. The downward movement of the linkage block 763 can cause the pull rod 764 on the other side to pull the suspension rod 769 and the sleeve block 768 on the other side to slide along the cross bar 767. The suspension rods 769 on both sides approach each other, which can pull the sleeves 7611 and the insertion rod 7612 on both sides along the sleeve rod 7610 to approach each other. The insertion rod 7612 can be inserted into the slot opened by the safety rod 6, thereby ensuring the safety of automobile maintenance.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A car maintenance lift, comprising a base and a support plate, characterized in that: The support plate is fixed on the base, and has two sides with outer grooves and inner grooves respectively. The base and the support plate are provided with two, and one end of the support plate away from the base is fixedly connected to the top plate, and a cavity is opened in the top plate; A lifting mechanism is installed in the cavity and the support plate of the top plate. The power output end of the lifting mechanism is connected to a bearing mechanism installed on the support plate. The vehicle can be placed on the bearing mechanism. The lifting mechanism is used to drive the vehicle up or down through the bearing mechanism. The safety rods are fixedly mounted on the supporting mechanism and are provided with two of them. The two safety rods are provided with slots. The safety rods correspond to safety mechanisms mounted on the top plate. The power output ends of the safety mechanisms are used to be inserted into the slots provided by the safety rods to ensure the safety of automobile maintenance.

2. The vehicle maintenance lift according to claim 1, characterized in that: The lifting mechanism comprises: A drive assembly is installed in the cavity opened in the top plate, wherein the power output end of the drive assembly is fixedly connected to a threaded column, and the end of the threaded column away from the drive assembly is rotatably connected to a fixed plate fixed to the support plate, and a lifting plate is threadedly sleeved on the threaded column; A guide groove is fixedly arranged in an outer groove formed in the support plate, wherein a guide wheel mounted on the lifting plate is slidably arranged in the guide groove; The reversing wheel is rotatably mounted on the support plate. A steel wire rope is wound around the reversing wheel. One end of the steel wire rope is fixedly connected to the lifting plate, and the bearing mechanism is fixedly connected to the other end of the steel wire rope.

3. The vehicle maintenance lift according to claim 2, characterized in that: The drive assembly includes: A first power member is fixedly mounted in a cavity defined in the top plate, wherein an output shaft of the first power member is fixedly connected to a first bevel gear; A stabilizing sleeve is fixedly mounted in a cavity defined by the top plate. A linkage rod is rotatably mounted on the stabilizing sleeve. A second bevel gear meshing with the first bevel gear is fixed on the linkage rod. Third bevel gears are fixedly mounted at both ends of the linkage rod. The rotating column is rotatably arranged in a cavity opened by the top plate. The threaded column and the rotating column are fixedly connected. The fourth bevel gear meshing with the third bevel gear is fixed on the rotating column.

4. The vehicle maintenance lift according to claim 1, wherein: The carrying mechanism comprises: Two edge plates are provided and fixedly connected to the power output end of the lifting mechanism. The edge plates are provided with notches. Reinforcement plates are fixedly provided on the two edge plates, and the safety rod is fixed on the reinforcement plates. A support assembly is mounted on the edge plate and the reinforcement plate. The vehicle can be placed on the support assembly for lifting and maintenance. The support assembly can be adjusted to suit the wheelbase of different vehicles. An inclined ladder, which is fixedly mounted on the edge plate, and the car can be driven onto the support assembly by the inclined ladder; The two ends of the sliding column are fixedly connected to the inner wall of the inner groove formed by the support plate. The sliding column is sleeved with a sliding sleeve fixedly connected to the edge plate.

5. The vehicle maintenance lift according to claim 4, characterized in that: The supporting assembly comprises: A screw rod, both ends of which are rotatably connected to the two reinforcement plates, a partition plate is fixedly provided in the middle of the screw rod, the screw rod threads on both sides of the partition plate rotate in opposite directions, and the ends of the screw rod are connected to a second power member mounted on the reinforcement plate; The guide rod has its two ends fixedly connected to the inner wall of the groove opened by the edge plate. A guide block is provided on the guide rod. A supporting plate connected to the screw thread is fixed on the guide block. The supporting plates are arranged on both sides of the partition. The car can be placed on the supporting plates for maintenance.

6. The vehicle maintenance lift according to claim 1, characterized in that: The safety mechanism includes: A third power member is fixedly mounted on the lower side of the top plate, wherein an output shaft of the third power member is fixedly connected to a driving gear; A circular sleeve is fixed on the top plate, a synchronous rod is rotatably arranged in the circular sleeve, and a driven gear meshing with the driving gear is fixed on the synchronous rod; The snap-in assembly is fixedly mounted on the top plate and connected to the end of the synchronization rod. Two snap-in assemblies are provided. The power output end of the snap-in assembly is used to snap into the slot opened by the safety rod to ensure the safety of automobile maintenance.

7. The vehicle maintenance lift according to claim 6, characterized in that: The snap-in assembly comprises: The trough body is fixedly mounted on the top plate, wherein a cavity is formed in the trough body, a linkage column is fixedly arranged in the middle of the cavity formed in the trough body, a linkage block is sleeved on the linkage column, and a pull rod is hinged on the linkage block; A threaded rod is rotatably mounted on the inner wall of the cavity formed by the tank body and is fixedly connected to the synchronization rod. A threaded block is provided on the threaded sleeve of the threaded rod. A crossbar is fixedly mounted on the inner wall of the other side of the cavity opened by the trough body and is arranged corresponding to the threaded rod. A sleeve block is sleeved on the crossbar and is arranged corresponding to the threaded block. There are two suspension rods, which are fixedly connected to the threaded block and the sleeve block respectively, and the pull rod is hinged to the suspension rod; The sleeve rod is fixed on the inner wall of the cavity. The sleeve rod is sleeved with a sleeve fixedly connected to the suspension rod. The sleeve is fixedly provided with an insertion rod, which can be inserted into a slot opened by the safety rod.

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