An automatic feeding mechanism capable of detecting and positioning the weld seam of welded steel pipes.

Abstract

This utility model discloses an automatic feeding mechanism capable of detecting and positioning the weld seam of a welded steel pipe. The mechanism includes: a base; a pipe hopper inclinedly mounted on the base; a stepped plate inclinedly mounted on the front side wall of the pipe hopper; several primary push rods vertically mounted within the pipe hopper; several secondary push rods vertically mounted on the lower step of the stepped plate; a positioning seat and a movable rotating clamp that cooperates with the positioning seat to clamp and rotate the welded steel pipe on the base located in front of the pipe hopper; several adjusting blocks with V-grooves arranged between the positioning seat and the movable rotating clamp; and a color difference sensor mounted on any one of the adjusting blocks to detect the welded steel pipe placed in the V-groove. This utility model can detect and position the weld seam of the welded steel pipe, and then, in conjunction with a robotic arm, ensure that the weld seam position remains consistent during pipe bending, guaranteeing the quality of the bending process.

Description

Technical Field

[0001] This utility model relates to the field of pipe manufacturing technology, and in particular to an automatic feeding mechanism capable of detecting and positioning the weld seam of welded steel pipes. Background Technology

[0002] Welded steel pipes are made by rolling steel plates or strips into shape and then welding them together. When bending welded steel pipes, the position of the weld seam determines the bending quality. If the weld seam is on the outer side of the bend, it may crack due to insufficient ductility. If the weld seam is on the inner side of the bend or near the neutral layer, the impact is smaller. Therefore, before bending welded steel pipes, the weld seam position needs to be determined according to the bending process to ensure the bending quality. Currently, the market relies on visual inspection and manual adjustment of the weld seam position, which cannot achieve automated production. This necessitates manual feeding or using robotic arms for feeding followed by manual adjustment, reducing work efficiency. Utility Model Content

[0003] The purpose of this invention is to provide an automatic feeding mechanism that can detect and position the weld seam of welded steel pipes. During feeding, the mechanism can detect and position the weld seam of the welded steel pipes, ensuring that the weld seams of the same batch of welded steel pipes are in the same position. Then, in conjunction with a robotic arm, the mechanism ensures that the weld seam positions of the same batch of welded steel pipes are consistent during bending, thereby guaranteeing consistent bending quality of the same batch of welded steel pipes.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: an automatic feeding mechanism capable of detecting and positioning the weld seam of a welded steel pipe, comprising: a base, a pipe hopper with a lower front and higher rear on the base, a stepped plate inclined on the front side wall of the pipe hopper, the inclined direction of the stepped plate being the same as the inclined direction of the pipe hopper, several primary push rods being raised and lowered in the pipe hopper, several secondary push rods being raised and lowered in the lower step of the stepped plate, the distance between the primary push rods and the front side wall and the distance between the secondary push rods and the higher step being smaller than the diameter of the welded steel pipe, a positioning seat and a movable rotating clamp that can cooperate with the positioning seat to clamp and rotate the welded steel pipe on the base located in front of the pipe hopper, several adjusting blocks with V-shaped grooves arranged in a row from left to right between the positioning seat and the movable rotating clamp, the adjusting blocks abutting against the front side wall of the stepped plate, and a color difference sensor capable of detecting the welded steel pipe placed in the V-shaped groove on any one of the adjusting blocks.

[0005] Furthermore, in the aforementioned automatic feeding mechanism capable of detecting and positioning the weld seam of welded steel pipes, the positioning seat includes: a positioning block, a right-angle plate, a linear bearing, and a floating rod. The positioning block is mounted on the base, the right-angle plate is fixed to the top of the positioning block, the linear bearing is fixed to the right-angle plate, the floating rod is slidably mounted in the linear bearing, a spring is provided between the end of the floating rod facing the adjusting block and the linear bearing, and a limit bolt is threadedly connected to the end of the floating rod away from the adjusting block.

[0006] Furthermore, in the aforementioned automatic feeding mechanism capable of detecting and positioning the weld seam of welded steel pipes, the movable rotary clamp includes: a slide, a push-pull cylinder, a spindle chuck, and a servo motor. Two parallel guide rails are provided on the base, and the slide is slidably mounted on the two guide rails. The push-pull cylinder is fixed to the base via a cylinder seat, and the piston rod of the push-pull cylinder is connected to the slide. The spindle chuck is fixedly mounted on the slide, and a motor seat is provided on the spindle chuck. The servo motor is fixed on the motor seat, and the servo motor is connected to the spindle chuck via a synchronous belt mechanism.

[0007] Furthermore, in the aforementioned automatic feeding mechanism capable of detecting and positioning the weld seam of welded steel pipes, two tie rods are installed between the left and right side walls of the pipe hopper. A baffle is movably installed in the pipe hopper, with two slots on the top of the baffle. Locking sleeves are movably fitted onto the two tie rods, and annular grooves are provided on the locking sleeves. The annular grooves on the locking sleeves are engaged with the slots on the baffle. A first set bolt is threaded onto the locking sleeve and abuts against the tie rod. An adjusting platform is installed on the base located in front of the pipe hopper. A positioning seat and an adjusting block are slidably engaged on the adjusting platform. A second set bolt is threaded onto both the positioning block and the adjusting block of the positioning seat and abuts against the adjusting platform. The end of the floating rod in the positioning seat facing the adjusting block is aligned with the front and rear of the baffle.

[0008] Furthermore, in the aforementioned automatic feeding mechanism capable of detecting and positioning the weld seam of welded steel pipes, the color difference sensor is fixed on an adjusting block near the movable rotating clamp. The color difference sensor is located below the V-groove of the adjusting block, with the sensing end of the color difference sensor facing upwards and aligned with the lowest end of the V-groove.

[0009] Furthermore, in the aforementioned automatic feeding mechanism capable of detecting and positioning the weld seam of the welded steel pipe, the top walls of the primary and secondary jacking rods are both inclined walls, the inclination direction of the inclined walls is the same as the inclination direction of the pipe hopper, and the diameters of the primary and secondary jacking rods are smaller than the diameter of the welded steel pipe.

[0010] Furthermore, in the aforementioned automatic feeding mechanism capable of detecting and positioning the weld seam of welded steel pipes, a through hole is provided on the base, and a main connecting plate is installed in the base below the through hole. A first lifting cylinder and two first guide rods are vertically installed on the main connecting plate. The first guide rods are slidably connected to the main connecting plate. A first lifting plate is fixedly installed between the two first guide rods. The piston rod of the first lifting cylinder is connected to the first lifting plate. A primary push rod is arranged on the first lifting plate. Several first lifting cylinders are installed on the bottom wall of the pipe hopper. A primary push rod passes through the corresponding first through hole and extends into the pipe hopper. A secondary connecting plate is fixedly installed on the main connecting plate. A second lifting cylinder and two second guide rods are vertically installed on the secondary connecting plate. The second guide rods are slidably connected to the secondary connecting plate. A second lifting plate is fixedly installed between the two second guide rods. The piston rod of the second lifting cylinder is connected to the second lifting plate. A secondary push rod is arranged on the second lifting plate. Several second through holes are provided on the stepped plate. The secondary push rod passes through the corresponding second through hole and extends into the stepped plate.

[0011] The advantages of this invention are as follows: When the welded steel pipe rotates under the action of the moving rotating clamp, the color difference sensor can distinguish the weld seam by the difference in color and width between the welded steel pipe and the weld seam. Once the color difference sensor detects the weld seam, the moving rotating clamp stops rotating. At this time, the weld seam of the welded steel pipe is aligned with the sensing end of the color difference sensor. The robot grabs the welded steel pipe on the adjusting block, the moving rotating clamp releases the welded steel pipe, and the robot transports the welded steel pipe to the pipe bending machine for bending. Since the position of the color difference sensor is fixed, the weld seam on each welded steel pipe stops rotating at the same position. When the robot transports the welded steel pipe to the pipe bending machine, the position of the weld seam on all welded steel pipes is consistent, which can ensure that the bending quality of all welded steel pipes is consistent.

[0012] The welded steel pipes are placed into the inclined pipe hopper, and then the welded steel pipes are fed one by one to the adjusting block by the cooperation of the primary jack, the secondary jack and the step plate. After being clamped by the moving rotating clamp, the weld position is located, thus realizing automatic feeding.

[0013] The pipe hopper is equipped with baffles that can be adjusted according to the length of the welded steel pipe. The distance between the baffles and the side wall of the pipe hopper near the moving rotating clamp can be adjusted according to the distance. Then, the number of adjusting blocks and the position of the positioning seat can be adjusted according to the distance, so as to adapt to the automatic feeding of welded steel pipes of different lengths. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the automatic feeding mechanism described in this utility model, which can detect and position the weld seam of welded steel pipes.

[0015] Figure 2 yes Figure 1 A cross-sectional structural diagram.

[0016] Figure 3 yes Figure 2 A structural schematic diagram of the middle section from another viewpoint.

[0017] Figure 4 yes Figure 1 A schematic diagram of the central positioning seat.

[0018] Figure 5 yes Figure 1 A magnified schematic diagram of the structure in the A direction. Detailed Implementation

[0019] The technical solution of this utility model will be further described below with reference to the accompanying drawings and preferred embodiments.

[0020] like Figures 1-5 As shown, the automatic feeding mechanism of this utility model, capable of detecting and positioning the weld seam of welded steel pipes, includes: a base 1; a pipe hopper 2 with a lower front and higher rear on the base 1; a stepped plate 3 inclined on the front side wall of the pipe hopper 2, the inclined direction of the stepped plate 3 being the same as the inclined direction of the pipe hopper 2; a plurality of primary push rods 21 raised and lowered within the pipe hopper 2; and a plurality of secondary push rods 31 raised and lowered within the lower step of the stepped plate 3. The distance between the primary push rods 21 and the front side wall of the pipe hopper 2, and the distance between the secondary push rods 31 and the stepped plate 3 are specified. The spacing between the high steps of plate 3 is smaller than the diameter of the welded steel pipe. A positioning seat 4 and a movable rotating clamp 5 that can cooperate with the positioning seat 4 to clamp the welded steel pipe and rotate are provided on the base 1 located in front of the pipe hopper 2. Several adjusting blocks 6 with V-shaped grooves 61 are arranged in a row from left to right between the positioning seat 4 and the movable rotating clamp 5. The adjusting blocks 6 abut against the front side wall of the step plate 3. A color difference sensor 7 that can detect the welded steel pipe placed in the V-shaped groove 61 is provided on any adjusting block 6.

[0021] The welded steel pipe is placed in the pipe hopper 2, with its left and right ends resting against the left and right side walls of the hopper 2. Because the hopper 2 is lower in the front and higher in the back, the welded steel pipe rolls forward under its own weight. The foremost welded steel pipe rests against the front side wall of the hopper 2. The initial push rod 21 in the hopper 2 rises, lifting the welded steel pipe resting against the front side wall upwards. The welded steel pipe lifted by the initial push rod 21 passes over the lower step of the step plate 3 and rolls back onto the lower step of the step plate 3 under its own weight. Then, the secondary push rod 31 lifts the welded steel pipe that has fallen onto the lower step upwards, and the welded steel pipe lifted by the secondary push rod 31 passes over the higher step of the step plate 3 and falls onto the higher step. During the rolling process, the left and right ends of the welded steel pipe remain against the left and right side walls of the hopper 2, located on the higher platform. The welded steel pipes on the steps roll down into the V-groove 61 of the adjusting block 6 under their own weight. The movable rotating clamp 5, in conjunction with the positioning seat 4, clamps the welded steel pipe placed in the V-groove 61. The movable rotating clamp 5 drives the welded steel pipe to rotate in the V-groove 61. When the color difference sensor 7 detects the weld seam on the welded steel pipe, the movable rotating clamp 5 stops driving the welded steel pipe to rotate. At this time, the weld seam of the welded steel pipe is aligned with the sensing end of the color difference sensor 7. The robot grabs the welded steel pipe on the adjusting block 6, the movable rotating clamp 5 releases the welded steel pipe, and the robot transports the welded steel pipe to the pipe bending machine for bending. Since the position of the color difference sensor 7 is fixed, the weld seam on each welded steel pipe stops rotating at the same position. When the robot transports the welded steel pipe to the pipe bending machine, the position of the weld seam on all welded steel pipes is consistent, which can ensure that the bending quality of all welded steel pipes is consistent. In this embodiment, the color difference sensor 7 is able to detect the weld because the color of the weld is different from the color of the welded steel pipe, and the radial width of the weld is much smaller than the width of the welded steel pipe. The color difference sensor 7 can determine that the narrower discolored area is the location of the weld.

[0022] In this embodiment, the color difference sensor 7 is fixed on the adjusting block 6 near the movable rotating clamp 5. The color difference sensor 7 is located below the V-groove 61 of the adjusting block 6, with the sensing end of the color difference sensor 7 facing upwards and aligned with the lowest end of the V-groove 61. In this way, when the welded steel pipe is rotated to the point where the weld seam faces downwards, the color difference sensor 7 can detect the weld seam, and the weld seam on the welded steel pipe is positioned downwards.

[0023] In this embodiment, the positioning seat 4 includes: a positioning block 41, a right-angle plate 42, a linear bearing 43, and a floating rod 44. The positioning block 41 is disposed on the base 1, the right-angle plate 42 is fixed on the top of the positioning block 41, the linear bearing 43 is fixed on the right-angle plate 42, the floating rod 44 is slidably disposed in the linear bearing 43, a spring 45 is disposed between the end of the floating rod 44 facing the adjusting block 6 and the linear bearing 43, and a limit bolt 46 is threadedly connected to the end of the floating rod 44 away from the adjusting block 6. The movable rotary clamp 5 includes: a slide 51, a push-pull cylinder 52, a spindle chuck 53, and a servo motor 54. Two parallel guide rails 11 are provided on the base 1. The slide 51 is slidably clamped on the two guide rails 11. The push-pull cylinder 52 is fixed to the base 1 by a cylinder seat. The piston rod of the push-pull cylinder 52 is connected to the slide 51. The spindle chuck 53 is fixedly provided on the slide 51. The spindle chuck 53 is a prior art technology, which is a pneumatic gripper integrated with the spindle. A motor seat is provided on the spindle chuck 53. The servo motor 54 is fixed on the motor seat. The servo motor 54 and the spindle chuck 53 are connected by a synchronous belt mechanism.

[0024] When the welded steel pipe falls onto the adjusting block 6, the push-pull cylinder 52 drives the slide 51 to move towards the adjusting block 6. The pneumatic gripper in the spindle chuck 53 pushes the welded steel pipe. The floating rod 44, after being pushed by the welded steel pipe, overcomes the spring 45 to buffer, preventing the pneumatic gripper in the spindle chuck 53 from hard-pressing against the welded steel pipe and causing damage. The pneumatic gripper in the spindle chuck 53 clamps the welded steel pipe, and the spindle chuck 53 rotates with the welded steel pipe under the action of the servo motor 54 and the synchronous belt mechanism. After the weld seam position is completed, the robot grips the welded steel pipe, and then the pneumatic gripper in the spindle chuck 53 releases the welded steel pipe. The push-pull cylinder 52 drives the slide 51 and the spindle chuck 53 to move away from the adjusting block 6. The pneumatic gripper in the spindle chuck 53 no longer interferes with the welded steel pipe, and the robot can then remove the welded steel pipe.

[0025] Two tie rods 22 are installed between the left and right side walls of the pipe hopper 2. A baffle 23 is movably installed in the pipe hopper 2. Two slots 231 are provided on the top of the baffle 23. A locking sleeve 24 is movably fitted on the two tie rods 22. An annular groove 241 is provided on the locking sleeve 24. The annular groove 241 on the locking sleeve 24 is engaged in the slot 231 of the baffle 23. A first set bolt 242 is threadedly connected to the locking sleeve 24 and abuts against the tie rod 22. An adjusting platform 12 is provided on the base 1 located at the front of the pipe hopper 2. The positioning seat 4 and the adjusting block 6 are both slidably engaged on the adjusting platform 12. A second set bolt 121 is threadedly connected to the positioning block 41 of the positioning seat 4 and the adjusting block 6 and abuts against the adjusting platform 12. The end of the floating rod 44 in the positioning seat 4 facing the adjusting block 6 is aligned with the front and rear of the baffle 23. Loosen the first set bolt 242, then move the locking sleeve 24 left and right along the pull rod 22. The baffle 23, which is engaged with the locking sleeve 24, will also move left and right together. When the baffle 23 moves to the designated position, tighten the first set bolt 242. The locking sleeve 24 will lock onto the pull rod 22, and the baffle 23 will be fixed. This allows you to adjust the left and right width of the space in the pipe hopper 2 where the welded steel pipes are stored. At the same time, the number of adjusting blocks 6 needs to be increased or decreased according to the size of the space in the pipe hopper 2 where the welded steel pipes are stored. Finally, move the positioning seat 4 back to the position where the floating rod 44 is aligned with the baffle 23.

[0026] After adjusting the distance between the baffle 23 and the side wall of the pipe hopper 2 near the movable rotating clamp 5 according to the length of the welded steel pipe, and the position of the positioning seat 4, when the welded steel pipe falls onto the adjusting block 6, one end of the welded steel pipe contacts the floating rod 44 on the positioning seat 4, and the other end of the welded steel pipe extends out of the adjusting block 6 closest to the movable rotating clamp 5. Then, the movable rotating clamp 5 can cooperate with the positioning seat 4 to clamp the welded steel pipe during the movement. If the left and right width of the pipe hopper 2 cannot be adjusted, and only the number of adjusting blocks 6 and the position of the positioning seat 4 are adjusted, when storing shorter welded steel pipes, the welded steel pipe is prone to hitting the positioning seat 4.

[0027] In this embodiment, the top walls of both the primary jacking rod 21 and the secondary jacking rod 31 are inclined walls, and the inclination direction of the inclined walls is the same as that of the pipe hopper 2. The diameters of the primary jacking rod 21 and the secondary jacking rod 31 are smaller than the diameter of the welded steel pipe. Since the diameter of the primary jacking rod 21 is smaller than the diameter of the welded steel pipe, the primary jacking rod 21 can only lift one welded steel pipe at a time, preventing multiple welded steel pipes from rolling down at the same time. The inclined top walls of the primary jacking rod 21 and the secondary jacking rod 31 prevent the welded steel pipe from staying on the primary jacking rod 21 or the secondary jacking rod 31, allowing the welded steel pipe to roll down more smoothly.

[0028] In this embodiment, a through hole 13 is provided on the base 1, and a main connecting plate 14 is provided in the base 1 below the through hole 13. A first lifting cylinder 141 and two first guide rods 142 are vertically arranged on the main connecting plate 14. The first guide rods 142 are slidably connected to the main connecting plate 14. A first lifting plate 143 is fixedly arranged between the two first guide rods 142. The piston rod of the first lifting cylinder 141 is connected to the first lifting plate 143. A primary push rod 21 is arranged on the first lifting plate 143. Several first through holes are provided on the bottom wall of the pipe material bin 2. The primary push rod 21 extends into the pipe material bin 2 after passing through the corresponding first through hole. The first lifting cylinder 141 drives the first lifting plate 143, which can drive the primary push rod 21 on the first lifting plate 143 to move up and down.

[0029] A secondary connecting plate 15 is fixedly installed on the main connecting plate 14. A second lifting cylinder 151 and two second guide rods 152 are vertically installed on the secondary connecting plate 15. The second guide rods 152 are slidably connected to the secondary connecting plate 15. A second lifting plate 153 is fixedly installed between the two second guide rods 152. The piston rod of the second lifting cylinder 151 is connected to the second lifting plate 153. A secondary push rod 31 is arranged on the second lifting plate 153. Several second through holes are provided on the step plate 3. The secondary push rod 31 extends into the step plate 3 after passing through the corresponding second through hole. The second lifting cylinder 151 drives the second lifting plate 153, which in turn drives the secondary push rod 31 on the second lifting plate 153 to move up and down.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of this utility model. Any modifications or equivalent substitutions that do not depart from the spirit and scope of this utility model should be covered within the protection scope of the claims of this utility model.

Claims

1. An automatic feeding mechanism capable of detecting and positioning the weld seam of welded steel pipes, including: The base is characterized by: a pipe hopper with a lower front and higher rear is provided on the base; a stepped plate is inclinedly provided on the front side wall of the pipe hopper, the inclination direction of the stepped plate being the same as the inclination direction of the pipe hopper; several primary push rods are raised and lowered in the pipe hopper; several secondary push rods are raised and lowered in the lower step of the stepped plate; the distance between the primary push rods and the front side wall and the distance between the secondary push rods and the higher step are both less than the diameter of the welded steel pipe; a positioning seat and a movable rotating clamp that can cooperate with the positioning seat to clamp and rotate the welded steel pipe are provided on the base located in front of the pipe hopper; several adjusting blocks with V-shaped grooves are arranged in a row from left to right between the positioning seat and the movable rotating clamp; the adjusting blocks abut against the front side wall of the stepped plate; and a color difference sensor that can detect the welded steel pipe placed in the V-shaped groove is provided on any one of the adjusting blocks.

2. The automatic feeding mechanism for detecting and positioning the weld seam of welded steel pipes according to claim 1, characterized in that: The positioning seat includes: a positioning block, a right-angle plate, a linear bearing, and a floating rod. The positioning block is set on the base, the right-angle plate is fixed on the top of the positioning block, the linear bearing is fixed on the right-angle plate, the floating rod is slidably set in the linear bearing, a spring is set between the end of the floating rod facing the adjusting block and the linear bearing, and a limit bolt is threadedly connected to the end of the floating rod away from the adjusting block.

3. The automatic feeding mechanism for detecting and positioning the weld seam of welded steel pipes according to claim 2, characterized in that: The movable rotary clamp includes: a slide, a push-pull cylinder, a spindle chuck, and a servo motor. Two parallel guide rails are provided on the base, and the slide is slidably mounted on the two guide rails. The push-pull cylinder is fixed to the base by a cylinder seat, and the piston rod of the push-pull cylinder is connected to the slide. The spindle chuck is fixedly mounted on the slide, and a motor seat is provided on the spindle chuck. The servo motor is fixed on the motor seat, and the servo motor is connected to the spindle chuck by a synchronous belt mechanism.

4. The automatic feeding mechanism for detecting and positioning the weld seam of welded steel pipes according to claim 3, characterized in that: Two tie rods are installed between the left and right side walls of the pipe hopper. A baffle is movably installed in the pipe hopper, and two slots are provided on the top of the baffle. Locking sleeves are movably fitted on the two tie rods, and annular grooves are provided on the locking sleeves. The annular grooves on the locking sleeves are engaged with the slots on the baffle. A first set bolt is threaded onto the locking sleeve and abuts against the tie rod. An adjusting platform is installed on the base located at the front of the pipe hopper. The positioning seat and the adjusting block are slidably engaged on the adjusting platform. A second set bolt is threaded onto the positioning block and the adjusting block of the positioning seat and abuts against the adjusting platform. The end of the floating rod in the positioning seat facing the adjusting block is aligned with the front and back of the baffle.

5. The automatic feeding mechanism for detecting and positioning the weld seam of a welded steel pipe according to any one of claims 1 to 4, characterized in that: The color difference sensor is fixed on the adjustment block near the movable rotating clamp. The color difference sensor is located below the V-groove of the adjustment block, with the sensing end of the color difference sensor facing upward and aligned with the lowest end of the V-groove.

6. The automatic feeding mechanism for detecting and positioning the weld seam of welded steel pipes according to claim 1, characterized in that: The top walls of both the primary and secondary jacking rods are inclined walls, and the inclination direction of the inclined walls is the same as that of the pipe hopper. The diameters of the primary and secondary jacking rods are smaller than the diameter of the welded steel pipe.

7. The automatic feeding mechanism for detecting and positioning the weld seam of a welded steel pipe according to claim 1 or 6, characterized in that: A through hole is made in the base, and a main connecting plate is set in the base below the through hole. A first lifting cylinder and two first guide rods are vertically set on the main connecting plate. The first guide rods are slidably connected to the main connecting plate. A first lifting plate is fixedly set between the two first guide rods. The piston rod of the first lifting cylinder is connected to the first lifting plate. A primary push rod is arranged on the first lifting plate. Several first through holes are set on the bottom wall of the pipe hopper. The primary push rod extends into the pipe hopper after passing through the corresponding first through hole. A secondary connecting plate is fixedly set on the main connecting plate. A second lifting cylinder and two second guide rods are vertically set on the secondary connecting plate. The second guide rods are slidably connected to the secondary connecting plate. A second lifting plate is fixedly set between the two second guide rods. The piston rod of the second lifting cylinder is connected to the second lifting plate. A secondary push rod is arranged on the second lifting plate. Several second through holes are set on the stepped plate. The secondary push rod extends into the stepped plate after passing through the corresponding second through hole.

Images