Charging basket elevator for hot-dip galvanizing production

Abstract

The utility model relates to an elevator, and discloses a charging basket elevator for hot-dip galvanizing production, which comprises an upright post, the lifting frame is slidably arranged on the stand column in a sleeving mode, and the sliding direction of the lifting frame is arranged in the axial direction of the stand column; the output end of the power part is connected with the lifting frame and drives the lifting frame to axially move along the stand column; the charging basket bracket is fixedly arranged at the end, away from the stand column, of the lifting frame. According to the utility model, the charging basket can be automatically immersed and lifted without depending on an operator, so that the labor intensity is reduced, the operation efficiency is improved, the operation safety risk of the operator is reduced, and the large-scale production requirement is met; the device is suitable for the hot-dip galvanizing industry and is used for completing the galvanizing operation of standard parts.

Description

Technical Field

[0001] This utility model relates to an elevator, specifically a material basket elevator used in hot-dip galvanizing production. Background Technology

[0002] Hot-dip galvanizing is an important means of metal surface anti-corrosion treatment. Its principle is to immerse standard parts that have been degreased and derusted into molten zinc at 500°C, so that a zinc layer or zinc-iron alloy coating is attached to the surface of the standard parts, thereby achieving the purpose of anti-corrosion.

[0003] In the existing technology, hot-dip galvanizing operations are usually carried out manually: after loading the standard parts to be treated into a metal mesh basket, the operator holds the long handle and immerses the basket into the zinc bath through the rigid connection structure between the long handle and the basket. After the coating is formed, the basket is manually lifted out again to complete a single galvanizing.

[0004] While this method achieves basic functionality, it has the following significant drawbacks: 1. The entire process relies on operators holding a long handle to immerse and remove the material basket, resulting in high labor intensity and low efficiency, making it difficult to meet the needs of large-scale production. 2. The operation poses high safety risks; operators must be in close contact with high-temperature molten zinc, and the zinc fumes emitted during the immersion process can easily cause respiratory diseases, seriously endangering the health of operators. Utility Model Content

[0005] The present invention aims to provide a material basket elevator for hot-dip galvanizing production, in order to solve the problems of high labor intensity, low work efficiency and high safety risks in the existing method of operators holding material baskets for galvanizing.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A basket elevator for use in hot-dip galvanizing production, comprising:

[0008] Columns;

[0009] The lifting frame is slidably sleeved on the column, and the sliding direction of the lifting frame is set along the axial direction of the column;

[0010] The power component has its output end connected to the lifting frame, driving the lifting frame to move along the axial direction of the column.

[0011] The basket bracket used to fix the basket is fixed at the end of the lifting frame away from the column.

[0012] As a limitation of this utility model: the middle area of ​​the material basket bracket is hollow to form a locking space, and the shape and size of the locking space are adapted to the shape and size of the material basket.

[0013] As a further limitation of this utility model: multiple claws are arranged at intervals along the circumference of the material basket bracket, and the clamping surface of each claw abuts against the side wall of the material basket to form a radial limit on the material basket.

[0014] As a further limitation of this utility model: at least two reinforcing ribs are provided between the material basket bracket and the lifting frame, and each end of the reinforcing rib is fixedly connected to the lifting frame and the material basket bracket.

[0015] As another limitation of this utility model: the lifting frame includes a fixedly connected support arm and a sleeve frame, the sleeve frame is slidably sleeved on the outer periphery of the column, and at least a pair of opposite side walls of the sleeve frame are symmetrically provided with rolling wheel sets, the rolling wheel sets include two rolling wheels that are rotatably connected to the sleeve frame, and the wheel surfaces of the rolling wheels are in rolling contact with the outer surface of the column.

[0016] As a further limitation of this utility model: a counterweight assembly is fixedly provided on the side of the sleeve frame opposite to the support arm. The counterweight assembly includes a support frame fixedly connected to the sleeve frame and a counterweight box fixedly provided on the support frame.

[0017] As another limitation of this utility model: the power component includes a winch, a traction cable, and a support pulley rotatably mounted on the top of the column. The first end of the traction cable is wound and connected to the drive roller of the winch, and the last end passes around the support pulley and is fixedly connected to the lifting frame. The rotation axis of the drive roller of the winch is parallel to the rotation axis of the support pulley.

[0018] As a further limitation of this utility model: a limiting block for controlling the lower limit of the sliding of the lifting frame is fixed at the bottom of the column.

[0019] As another limitation of this utility model: it also includes a control system equipped with a PLC controller and straight rods that are parallel to and spaced apart from the column; a first proximity switch, a second proximity switch and a third proximity switch are fixedly fixed in sequence along the vertical direction on the side of the straight rod facing the column; a metal sensing plate that senses and cooperates with the first proximity switch, the second proximity switch and the third proximity switch is fixed on the lifting frame; the first proximity switch, the second proximity switch and the third proximity switch are all electrically connected to the signal input terminal of the PLC controller; and the control output terminal of the PLC controller is electrically connected to the power component.

[0020] By adopting the above technical solution, the beneficial effects achieved by this utility model compared with the prior art are as follows:

[0021] (1) This utility model includes a column, a lifting frame, a power component, and a basket support; the lifting frame is slidably mounted on the column, the basket support is fixedly connected to the lifting frame, and the power component is used to drive the lifting frame to move along the axial direction of the column, thereby realizing the vertical movement of the basket. In practice, the basket is placed in the basket support, and under the drive of the power component, the lifting frame, the basket support, and the basket rise or fall together in the vertical direction. When it falls to a certain position, the basket is immersed in zinc liquid to immerse the standard parts inside the basket in zinc. After the zinc immersion is completed, the power component drives the lifting frame to rise, leave the zinc liquid, and replace the next basket. This structure can realize the automatic immersion and lifting of the basket without relying on operators, reducing labor intensity, improving work efficiency, reducing the safety risks of operators, and meeting the needs of large-scale production;

[0022] (2) This utility model is also provided with a counterweight component. Because the lifting frame and the material basket bracket are located on one side of the column, the device is prone to shaking due to unbalanced forces when the lifting frame moves in the vertical direction. The counterweight component is set on the side opposite to the lifting frame and the material basket bracket to balance the forces and improve the stability of the device;

[0023] (3) This utility model also includes a control system equipped with a PLC controller and straight rods parallel to and spaced apart from the column; a first proximity switch, a second proximity switch, and a third proximity switch are fixedly installed vertically on the side of the straight rod facing the column, and a metal sensing plate is fixed on the lifting frame. When the metal sensing plate is aligned with the first proximity switch, the lifting frame is at the upper limit position; when the metal sensing plate is aligned with the second proximity switch, the lifting frame is at the floating middle position; when the metal sensing plate is aligned with the third proximity switch, the lifting frame is at the lower limit position. In practice, the lifting frame is at the upper limit position waiting for the material basket to be placed into the material basket holder. After the material basket is placed, the PLC controller controls the lifting frame to descend to the lower limit position and cyclically moves between the floating middle position and the lower limit position to complete the zinc immersion; after zinc immersion, the lifting frame stays at the lower limit position, waiting for the material basket to be removed. After the material basket is removed, the PLC controller controls the lifting frame to rise to the upper limit position, waiting to receive a new material basket. This device realizes the automated control of the material basket, which facilitates the reduction of manual labor intensity and meets the needs of large-scale production.

[0024] In summary, this utility model reduces labor intensity, improves work efficiency, reduces the operational safety risks for operators, and meets the needs of large-scale production. This utility model is applicable to the hot-dip galvanizing industry and is used to complete the galvanizing operation of standard parts. Attached Figure Description

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0027] Figure 2 This is a three-dimensional structural diagram of an embodiment of the present invention from another perspective (the traction cable is not shown).

[0028] Figure 3 This is a top view of an embodiment of the present invention (traction cable and counterweight assembly are not shown).

[0029] Figure 4 for Figure 3 Sectional view along the middle AA direction;

[0030] Figure 5 for Figure 3 Sectional view along the BB direction.

[0031] In the diagram: 1-Column, 2-Lifting frame, 21-Support arm, 22-Sleeve frame, 23-Rolling wheel assembly, 231-First rolling wheel, 232-Second rolling wheel, 3-Basket bracket, 31-Clipping space, 32-Claw, 321-Clamping surface, 4-Reinforcing rib, 5-Counterweight assembly, 51-Support frame, 52-Counterweight box, 6-Winch, 7-Traction cable, 8-Support pulley, 9-Lifting ear plate, 10-Limiting block, 11-Straight rod, 12-First proximity switch, 13-Second proximity switch, 14-Third proximity switch, 15-Metal sensing plate, 16-Base plate, 17-Left plate, 18-Right plate, 19-Front plate, 20-Rear plate. Detailed Implementation

[0032] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and do not constitute a limitation thereof.

[0033] The directional terms or positional relationships such as "left," "right," "front," and "back" used in the embodiments are based on the drawings in this utility model specification. Figure 1 The orientation relationships are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component must have a specific orientation, or that it must be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the content protected by this utility model.

[0034] like Figures 1-5 As shown, this embodiment includes a column 1, a lifting frame 2, a power component, and a material basket bracket 3. The material basket bracket 3 is used to fix the material basket. The power component drives the lifting frame 2 to move the material basket bracket 3 up and down in the vertical direction to realize the zinc immersion of standard parts in the material basket.

[0035] 1. Column 1;

[0036] In this embodiment, the column 1 is vertically arranged, that is, its axial direction extends in the vertical direction, and the bottom end of the column 1 is fixed on the base plate 16 for stable placement.

[0037] II. Lifting frame 2;

[0038] The lifting frame 2 is slidably sleeved on the column 1, and the sliding direction of the lifting frame 2 is set along the axial direction of the column 1. Specifically, as Figure 1 shown, the lifting frame 2 includes a support arm 21 and a sleeve frame 22 which are fixedly connected by welding. The support arm 21 has a "factory" - shaped structure. The sleeve frame 22 is slidably sleeved on the outer periphery of the column 1. In this embodiment, the sleeve frame 22 is formed by fixedly connecting four flat plates end to end to form a frame with a rectangular cross - section, and the four flat plates surround the outer periphery of the column 1.

[0039] At least one pair of opposite side walls of the sleeve frame 22 are symmetrically provided with rolling wheel groups 23. As Figure 3-5 shown, in this embodiment, rolling wheel groups 23 are symmetrically provided on the left flat plate 17 and the opposite right flat plate 18, and rolling wheel groups 23 are also symmetrically provided on the front flat plate 19 and the opposite rear flat plate 20. Of course, it is also possible to choose to set the rolling wheel groups 23 only on the left flat plate 17 and the right flat plate 18 or on the front flat plate 19 and the rear flat plate 20.

[0040] The rolling wheel group 23 includes two rolling wheels respectively rotatably connected to the sleeve frame 22. In this embodiment, two sets of rolling wheel groups 23 arranged at intervals in the vertical direction are provided on both the left flat plate 17 and the opposite right flat plate 18, and on the front flat plate 19 and the opposite rear flat plate 20.

[0041] The rolling wheel groups 23 on the left flat plate 17 and the opposite right flat plate 18: The structure of the left flat plate 17 is the same as that of the right flat plate 18. Taking the right flat plate 18 as an example, as Figure 1 , 5 shown, two first rolling wheels 231 are arranged at intervals in the vertical direction on the right flat plate 18. The first rolling wheel 231 at the upper position on the right flat plate 18 and the first rolling wheel 231 at the upper position on the left flat plate 17 form a set of rolling wheel groups 23; the first rolling wheel 231 at the lower position on the right flat plate 18 and the first rolling wheel 231 at the lower position on the left flat plate 17 form a set of rolling wheel groups 23. A total of two sets of rolling wheel groups 23 are provided on the left flat plate 17 and the opposite right flat plate 18.

[0042] The installation method of the first rolling wheel 231 is: Taking the right flat plate 18 as an example, as Figure 1 shown, an opening is provided at the position corresponding to the first rolling wheel 231 on the right flat plate 18, a rotating shaft is fixedly installed at the opening, the first rolling wheel 231 is rotatably sleeved on the rotating shaft, and the first rolling wheel 231 passes through the opening, and its wheel surface is in rolling contact with the outer surface of the column 1. This installation method is prior art.

[0043] The rolling wheel groups 23 on the front flat plate 19 and the opposite rear flat plate 20: The structure of the front flat plate 19 is the same as that of the rear flat plate 20. Taking the rear flat plate 20 as an example, as Figure 1 , 2 As shown in Figure 4, two second rolling wheels 232 are arranged vertically on the rear plate 20. The second rolling wheel 232 at the upper position on the rear plate 20 and the second rolling wheel 232 at the upper position on the front plate 19 form a rolling wheel group 23; the second rolling wheel 232 at the lower position on the rear plate 20 and the second rolling wheel 232 at the lower position on the front plate 19 form a rolling wheel group 23. A total of two rolling wheel groups 23 are arranged on the front plate 19 and the opposite rear plate 20.

[0044] The installation method of the second roller 232 is as follows: Taking the tablet 20 as an example, as follows... Figure 2 As shown, a lug plate is provided on the rear plate 20, and the second rolling wheel 232 is rotatably connected to the lug plate through a bearing. This installation method is existing technology. The wheel surface of the second rolling wheel 232 also makes rolling contact with the outer surface of the column 1.

[0045] 3. Material basket support frame;

[0046] like Figure 1 As shown, the material basket bracket 3 is fixed at the end of the lifting frame 2 away from the column 1, and is used to fix the material basket.

[0047] The central area of ​​the basket bracket 3 is hollow, forming a locking space 31. The shape and size of the locking space 31 are adapted to the shape and size of the basket. Here, "adapted" means that the shape and size of the locking space 31 are similar to the shape and size of the basket. In order to securely fix the basket and prevent it from shaking, this embodiment has multiple claws 32 spaced along its circumference on the basket bracket 3. The clamping surface 321 of each claw 32 abuts against the side wall of the basket to form a radial limit on the basket, thereby fixing the basket.

[0048] In this embodiment, the outer contour of the basket support 3 is a polygonal structure. To increase the connection strength between the basket support 3 and the lifting frame 2, at least two reinforcing ribs 4 are provided between the basket support 3 and the lifting frame 2. In this embodiment, there are two reinforcing ribs 4, distributed on both sides of the lifting frame 2. The two ends of each reinforcing rib 4 are fixedly connected to the support arm 21 of the lifting frame 2 and the basket support 3, respectively. The number of reinforcing ribs 4 can also be three, four, or other numbers.

[0049] IV. Power components;

[0050] The output end of the power component is connected to the lifting frame 2, which drives the lifting frame 2 to move along the axial direction (i.e., the vertical direction) of the column 1.

[0051] like Figure 1As shown, the power components include a winch 6, a traction cable 7, and a support pulley 8 rotatably mounted on the top of the column 1. The first end of the traction cable 7 is wound and connected to the drive roller of the winch 6, and the last end passes over the support pulley 8 and is fixedly connected to the lifting frame 2. In this embodiment, the traction cable 7 is a rope, and a lifting lug 9 is fixed on the support arm 21 of the lifting frame 2. The last end of the traction cable 7 passes through the through hole on the lifting lug 9 and is tied and fixed. Figure 1 As shown, in this embodiment, a crossbar is fixed to the top of the column 1, and two supporting pulleys 8 are provided, which are rotatably arranged on the crossbar at intervals. The specific structure of the supporting pulleys 8 is prior art and will not be described in detail in this embodiment. The rotation axis of the drive roller of the winch 6 is parallel to the rotation axis of the supporting pulleys 8. The supporting pulleys 8 act as a force-bearing point. When the winch 6 is working, it pulls the traction cable 7. The supporting pulleys 8 provide support force and rotate under the pull of the traction cable 7, making the traction cable 7 pull more smoothly. Under the pull of the traction cable 7, the lifting frame 2 is driven to rise.

[0052] Of course, the power component in this embodiment can also be any other structure in the prior art that can provide driving force, such as a cylinder. The piston rod of the cylinder is fixedly connected to the lifting frame 2. When the cylinder works, the piston rod extends or retracts, causing the lifting frame 2 to rise or fall.

[0053] V. Counterweight Component 5;

[0054] Because the lifting frame 2 and the material basket support 3 are located on one side of the column 1, the lifting frame 2 is prone to swaying due to unbalanced forces during vertical movement. Therefore, if... Figure 1 , 2 As shown, a counterweight assembly 5 is fixedly mounted on the side of the sleeve frame 22 opposite to the support arm 21 (i.e., the rear side of the sleeve frame 22). The counterweight assembly 5 includes a support frame 51 fixedly connected to the sleeve frame 22 and a counterweight box 52 fixed on the support frame 51. The structure of the counterweight box 52 is existing technology. The weight of the counterweight assembly 5 is similar to the sum of the weights of the lifting frame 2, the material basket bracket 3, and the material basket. The counterweight assembly 5 is used to balance the force and improve the stability of the device.

[0055] VI. Limiting block 10;

[0056] like Figure 2 As shown, a limiting block 10 for controlling the lower limit of the sliding of the lifting frame 2 is fixed at the bottom of the column 1. The limiting block 10 is a triangular plate and is welded and fixed to the column 1. If the traction cable 7 breaks, the lifting frame 2 will slide excessively, thereby colliding with the equipment containing zinc liquid and causing damage to the equipment. In this embodiment, the limiting block 10 can prevent the lifting frame 2 from sliding excessively, thereby avoiding the collision between the lifting frame 2 and the equipment.

[0057] In practice, the material basket is placed in the basket support 3. Driven by the winch 6, the lifting frame 2 is pulled by the traction cable 7, which in turn moves the basket support 3 and the material basket together vertically upwards or downwards. When it descends to a certain position, the basket is immersed in molten zinc to galvanize the standard parts inside. After galvanizing, the winch 6 operates, causing the lifting frame 2 to rise, and the basket leaves the molten zinc. The next basket is then used for galvanizing. This structure enables automatic immersion and removal of the basket without the need for operators, reducing labor intensity, improving work efficiency, reducing operator safety risks, and meeting the needs of large-scale production.

[0058] VII. Control System;

[0059] To achieve automated control, this embodiment also includes a control system equipped with a PLC controller and straight rods 11 that are parallel to and spaced apart from the column 1, such as... Figure 2 As shown, the straight rod 11 is fixedly connected to the column 1 by an L-shaped plate. A first proximity switch 12, a second proximity switch 13, and a third proximity switch 14 are sequentially fixed along the vertical direction on the side of the straight rod 11 facing the column 1. A metal sensing plate 15, which senses and engages with the first proximity switch 12, the second proximity switch 13, and the third proximity switch 14, is fixed on the sleeve frame 22 of the lifting frame 2. The structure of each proximity switch and its sensing principle with the metal sensing plate 15 are existing technologies and will not be described in detail in this embodiment.

[0060] The first proximity switch 12, the second proximity switch 13, and the third proximity switch 14 are all electrically connected to the signal input terminal of the PLC controller, and the control output terminal of the PLC controller is electrically connected to the winch 6. This part is prior art. When the metal sensing plate 15 is aligned with the first proximity switch 12, the lifting frame 2 is in the upper limit position; when the metal sensing plate 15 is aligned with the second proximity switch 13, the lifting frame 2 is in the floating middle position; when the metal sensing plate 15 is aligned with the third proximity switch 14, the lifting frame 2 is in the lower limit position.

[0061] During implementation, a robotic gripper picks up the material basket and places it into the basket holder 3, and then removes the basket from the basket holder 3 after zinc immersion. The robotic gripper is a commonly used structure and will not be described in detail here. The automation control principle of this embodiment is as follows:

[0062] Initial position: The lifting frame 2 is in the first proximity switch 12 position by default, that is, the lifting frame 2 is in the upper limit position.

[0063] Material basket placement: The robot gripper places the material basket in the material basket bracket 3. The robot gripper sends a descent command signal to the PLC. The PLC controls the winch 6 to work, so that the lifting frame 2 descends to the position of the third proximity switch 14. At this time, the lifting frame 2 is at the lower limit position.

[0064] Floating zinc immersion stage: The PLC controls the winch 6 to operate, causing the lifting frame 2 to automatically cycle between the second proximity switch 13 and the third proximity switch 14 (i.e., between the floating center position and the lower limit position). It should be noted that in this embodiment, the floating parameters are set as follows: floating frequency 0.5-2Hz; stroke range is 80% of the distance between the center position and the lower limit position; duration is set according to process requirements, generally lasting 30-120 seconds.

[0065] Grasping preparation stage: After the floating is completed, the PLC controls the winch 6 to work, so that the lifting frame 2 automatically stops at the position of the third proximity switch 14, and the control system sends a ready signal to notify the robot gripper.

[0066] Grasping execution phase: The robot gripper moves to the position of the third proximity switch 14 to grab the material basket. After the grab is completed, it sends a confirmation signal to the PLC.

[0067] Reset process: After receiving the confirmation signal, the PLC controls the winch 6 to work, so that the lifting frame 2 stops when it rises to the position of the first proximity switch 12, ready to receive the new material basket.

[0068] Because individual operational differences exist when manually controlling the immersion speed, angle, and dwell time of the material basket, uneven coating thickness and incomplete coating are easily caused, affecting product yield. This application achieves automated control of the immersion speed, angle, and soaking time of the material basket through the cooperation of a control system, a first proximity switch 12, a second proximity switch 13, and a third proximity switch 14, resulting in a more uniform coating on the surface of standard parts and ensuring product yield.

[0069] It should be noted that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A basket elevator for use in hot dip zinc production, characterized in that, The utility model relates to a lifting device for material basket, including: a stand; a lifting frame slidingly sleeved on the stand, the sliding direction of the lifting frame being arranged along the axial direction of the stand; a power element, the output end of which is connected to the lifting frame to drive the lifting frame to move along the axial direction of the stand; a material basket holder for fixing the material basket, which is fixed to the end of the lifting frame away from the stand.

2. A basket elevator for use in hot dip zinc production according to claim 1, characterized in that, The middle region of the material basket holder is hollow to form a clamping space, the shape and size of the clamping space being matched with those of the material basket.

3. A basket elevator for use in hot dip zinc production according to claim 2, characterized in that, A plurality of clamping claws are arranged on the material basket holder along the circumferential direction thereof, the clamping surfaces of the clamping claws abutting against the side walls of the material basket to form radial limiting of the material basket.

4. A basket elevator for use in hot dip zinc production according to claim 3, characterized in that, At least two reinforcing ribs are arranged between the lifting frame and the material basket holder, the two ends of each reinforcing rib being fixedly connected to the lifting frame and the material basket holder, respectively.

5. A basket elevator for use in hot dip galvanizing production according to any one of claims 1 - 4, characterized in that, The lifting frame includes a support arm and a sleeve frame fixedly connected to each other, the sleeve frame being slidingly sleeved on the outer periphery of the stand, at least one pair of opposite side walls of the sleeve frame being symmetrically provided with a rolling wheel set, the rolling wheel set including two rolling wheels each being rotationally connected to the sleeve frame, the wheel surfaces of the rolling wheels being in rolling contact with the outer surface of the stand.

6. A basket elevator for use in hot dip zinc production according to claim 5, characterized in that, A counterweight assembly is fixedly arranged on the side of the sleeve frame opposite to the support arm, the counterweight assembly including a support frame fixedly connected to the sleeve frame and a counterweight box fixedly arranged on the support frame.

7. A basket elevator for use in hot dip galvanizing production according to any one of claims 1 - 4, 6, characterized in that, The power element includes a winch, a traction cable, and a support pulley rotationally arranged on the top of the stand, the first end of the traction cable being wound around the driving roller of the winch, the last end of the traction cable being wound around the support pulley and fixedly connected to the lifting frame, the rotation axis of the driving roller of the winch being parallel to the rotation axis of the support pulley.

8. A basket elevator for use in hot dip zinc production according to claim 7, characterized in that, A limiting block for controlling the lower limit of the sliding of the lifting frame is fixedly arranged at the bottom of the stand.

9. A basket elevator for use in hot dip galvanizing production according to any one of claims 1 - 4, 6, 8, characterized in that, The utility model also includes a control system provided with a PLC controller and a straight rod arranged in parallel with and spaced apart from the stand, the side of the straight rod facing the stand being fixedly provided with a first proximity switch, a second proximity switch, and a third proximity switch in sequence along the vertical direction, a metal sensing sheet being fixedly arranged on the lifting frame to be in sensing cooperation with the first proximity switch, the second proximity switch, and the third proximity switch, the first proximity switch, the second proximity switch, and the third proximity switch all being electrically connected to the signal input end of the PLC controller, and the control output end of the PLC controller being electrically connected to the power element.

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