Adjustable steel plate feeding machine for metal tile production

Abstract

The utility model relates to the technical field of metal tile production equipment, in particular to an adjustable steel plate feeding machine for metal tile production. The adjustable steel plate feeding machine comprises a rack and a containing roller used for containing a metal coiled material, and the rack is provided with a first pressing roller, a second pressing roller and a third pressing roller; the number of the first pressing rollers, the number of the second pressing rollers and the number of the third pressing rollers are at least two, a clamping assembly used for clamping metal coiled materials is arranged on the rack, the clamping assembly is connected with an adjusting assembly, the clamping assembly is connected to the rack through the adjusting assembly, and a counting assembly is arranged on the rack. And the clamping assembly comprises a sliding rod, at least two sliding blocks are connected to the sliding rod in a sliding mode, and the effect that the feeding machine automatically adjusts the clamping position according to the position of the metal coiled material is achieved.

Description

Technical Field

[0001] This application relates to the technical field of metal tile production equipment, and in particular to an adjustable steel sheet loading machine for metal tile production. Background Art

[0002] With the vigorous development of modern society and the rapid progress of technology, the emergence of metal tiles has replaced traditional roofing tiles such as glazed tiles, clay tiles, and cement tiles. Metal tiles are made of metal and have the characteristics of high temperature resistance, low temperature resistance, and fire resistance. Compared with traditional roofing tiles, they have a wider construction range, a longer overall color retention time, and high structural safety.

[0003] During the production of existing metal tiles, metal coils are usually used as raw materials. The metal coils are placed on rollers, and the loading machine is used to pull the metal coils into the profiler. Since the metal coils are heavy and inconvenient to move, when the straightened metal coils deviate, the operator needs to manually adjust the fixing bolts of the clamping assembly of the loading machine to re-clamp the metal coils to ensure the normal progress of the loading work and subsequent processing steps.

[0004] The above-mentioned existing technical solutions have the following defects: When the operator manually adjusts the loading machine, it is easy to cause improper operation, resulting in equipment damage and even endangering the safety of the operator. Summary of the Utility Model

[0005] In order to enable the loading machine to automatically adjust the clamping position according to the position of the metal coil, this application provides an adjustable steel sheet loading machine for metal tile production.

[0006] The above technical objectives of this application are achieved through the following technical solutions:

[0007] An adjustable steel sheet loading machine for metal tile production includes a frame and a placement roller for placing metal coils. The frame is provided with a first pressing roller, a second pressing roller, and a third pressing roller. At least two of the first pressing roller, the second pressing roller, and the third pressing roller are provided. The frame is provided with a clamping assembly for clamping the metal coil. The clamping assembly is connected with an adjusting assembly, and the clamping assembly is connected to the frame through the adjusting assembly. The frame is provided with a counting assembly; the clamping assembly includes a sliding rod, and at least two sliders are slidably connected to the sliding rod.

[0008] By adopting the above technical solution, the metal coil can be rolled flat and stably clamped in the loading machine. The slider can move on the slide bar, and the position of the clamping component can be adjusted according to the placement position of the metal coil, ensuring that the metal coil can be stably clamped by the loading machine. The counting component can record the length of the metal coil output by the loading machine, facilitating the processing of the metal coil by the operators in subsequent processes. By automatically adjusting the clamping position, it reduces the improper adjustment caused by the staff when adjusting the working loading machine, ensures the normal operation of the loading machine, and at the same time ensures the safety of the staff.

[0009] Optionally, the clamping component further includes a mounting bracket, the mounting bracket is fixedly connected to the slide bar, a pneumatic push rod is installed on the mounting bracket, the output end of the pneumatic push rod is fixedly connected to a slider, a gear is rotatably connected to the mounting bracket, the gear meshes with a rack, there are two racks, and one ends of the two racks are respectively fixedly connected to two sliders, and the other ends are respectively slidably connected to the two sliders.

[0010] By adopting the above technical solution, the contraction of the pneumatic push rod drives the slider to move, and at the same time the gear and the rack drive the two sliders to move towards each other, enabling the slider to move and continuously clamp both sides in the length direction of the metal coil, reducing the manual operation steps of the staff when the loading machine is working, and ensuring the safety of the staff.

[0011] Optionally, a chute is formed on one side of the slider.

[0012] By adopting the above technical solution, both sides in the length direction of the metal coil are embedded in the chute, and the chute will limit both sides of the metal coil, ensuring that the metal coil does not fall out of the clamping component when it stops moving.

[0013] Optionally, a chamfer is formed at the connection between the bottom of the chute and the side wall of the slider.

[0014] By adopting the above technical solution, the wear of the slider caused by the movement of the metal coil can be reduced.

[0015] Optionally, a limiting roller is rotatably arranged in the chute.

[0016] By adopting the above technical solution, when the metal coil is offset, both sides in the length direction of the metal coil are in contact with the limiting roller, which can ensure that the metal coil is not stuck by the slider and ensure that the adjusting component can drive the clamping component to adjust to a suitable clamping angle.

[0017] Optionally, the adjusting assembly includes an adjusting frame slidably disposed on the frame. There are at least two adjusting frames, which are respectively sleeved and slid on both ends of the sliding rod. At least two adjusting grooves are formed on the frame, and the two adjusting grooves are respectively located on both sides of the frame. An adjusting rod is inserted through the adjusting frame, one section of the adjusting rod is inserted and slid in the adjusting groove, and the diameter of the adjusting rod is smaller than the width of the adjusting groove.

[0018] By adopting the above technical solution, the movement of both ends of the adjusting assembly on the frame drives the clamping assembly to adjust the clamping angle, ensuring the stable clamping of the metal coil by the loading machine, reducing the manual operation steps of the staff during the operation of the loading machine, and ensuring the safety of the staff.

[0019] Optionally, the counting assembly includes an adjusting screw threadedly connected to the frame. A cross bar is fixedly connected to the adjusting screw, an adjusting plate is fixedly connected to the cross bar, an installation plate is connected to one side of the adjusting plate, and a counter is installed on the installation plate.

[0020] By adopting the above technical solution, the length of the adjusting screw extending out of the frame can be adjusted to adjust the distance between the counter and the metal coil, ensuring that the counter is close to the end face of the metal coil.

[0021] Optionally, the adjusting plate is hinged to the installation plate. A guiding column is fixedly connected to the installation plate, a limiting plate is fixedly connected to the adjusting plate. One end of the guiding column passes through the limiting plate and is threadedly connected with a limiting nut. An elastic member is sleeved on the peripheral wall of the guiding column, and the elastic member is located between the installation plate and the limiting plate.

[0022] By adopting the above technical solution, after the loading machine stops working, the guiding rod and the limiting nut will limit the rotation angle of the installation plate, ensuring that the counter does not collide with the end of the metal coil during the next feeding. Through the telescoping of the guiding column and the elastic force of the elastic member, the counter is close to the plate surface of the metal coil, ensuring that the counter is close to the end face of the metal coil and accurately counting during operation, reducing the manual operation steps of the staff during the operation of the loading machine, and ensuring the safety of the staff.

[0023] In summary, the present application has the following technical effects:

[0024] By setting the clamping assembly and the adjusting assembly, the clamping position can be automatically adjusted, reducing the improper adjustment caused by the staff when adjusting the working loading machine, ensuring the normal operation of the loading machine, and at the same time ensuring the safety of the staff.

[0025] By setting the sliding groove and the limiting roller, when the metal coil is offset, the two sides in the length direction of the metal coil are attached to the limiting roller, which can ensure that the metal coil is not stuck by the slider, and ensure that the adjusting assembly can drive the clamping assembly to adjust to a suitable clamping angle.

[0026] By setting up an installation plate, guide posts and elastic members, the counter can be closely attached to the plate surface of the metal coil, ensuring that the counter closely adheres to the end face of the metal coil during operation and accurately counts, reducing the manual operation steps of the staff during the operation of the loading machine and ensuring the safety of the staff. Brief Description of the Drawings

[0027] Figure 1 is the external shape structure diagram of the present application;

[0028] Figure 2 is the prominent structure diagram of the clamping component and the adjusting component of the present application;

[0029] Figure 3 is the present application Figure 2 enlarged view of part A in;

[0030] Figure 4 is the prominent structure diagram of the counting component of the present application.

[0031] Description of the Reference Numerals: 1, frame; 101, first motor; 102, first transmission box; 103, second motor; 104, second transmission box; 2, placing roller; 201, metal coil; 3, first driving shaft; 301, first driving roller; 4, first pressing roller; 5, second pressing roller; 6, third pressing roller; 7, clamping component; 701, slide bar; 702, slider; 7021, chute; 7022, limiting roller; 703, mounting bracket; 704, pneumatic push rod; 705, gear; 706, rack; 8, adjusting component; 801, adjusting frame; 8011, adjusting groove; 802, adjusting rod; 9, counting component; 901, adjusting screw; 902, cross bar; 903, U-shaped bolt; 904, adjusting plate; 9041, mounting hole; 905, installation plate; 906, counter; 907, guide post; 908, limiting nut; 909, elastic member; 10, second driving shaft; 1001, second driving roller; 11, fourth pressing roller. Detailed Description of the Embodiment

[0032] The present application will be further described in detail below with reference to the accompanying drawings.

[0033] The embodiment of the present application discloses an adjustable steel loading machine for the production of metal tiles, with reference to Figure 1, The loading machine includes a frame 1 and a placing roller 2. The placing roller 2 is located at one end of the frame 1 in the length direction. A metal coil 201 is placed on the placing roller 2. At the bottom of the frame 1 near one end of the placing roller 2, a first motor 101 is installed. The output shaft of the first motor 101 is connected to a first transmission box 102 through a coupling. At one end of the frame 1 near the placing roller 2, a first driving shaft 3 is rotatably connected. There are two first driving shafts 3 and they are arranged vertically at intervals. One end of the first driving shaft 3 near the first transmission box 102 is connected to the first transmission box 102 through a coupling. On the first driving shaft 3, two first driving rollers 301 are connected by keys. The two first driving rollers 301 are arranged at intervals along the length direction of the first driving shaft 3.

[0034] Refer to Figure 1 , A first pressing roller 4 is rotatably connected to a section of the frame 1 near the first driving shaft 3. The first pressing roller 4 is located on the side of the first driving shaft 3 away from the placing roller 2. There are two first pressing rollers 4 and they are arranged vertically at intervals. A second pressing roller 5 is rotatably connected to the frame 1. There are two second pressing rollers 5 and they are arranged vertically at intervals. On the frame 1, a third pressing roller 6 is fixedly connected by bolts. There are five groups of the third pressing rollers 6. Each group has two third pressing rollers 6 and the two third pressing rollers 6 are arranged vertically at intervals.

[0035] Refer to Figure 1 , A clamping assembly 7 is installed on the frame 1. The clamping assembly 7 is connected to an adjusting assembly 8. The clamping assembly 7 is connected to the frame 1 through the adjusting assembly 8. There are two sets of the clamping assembly 7. One set of the clamping assembly 7 is located between the first pressing roller 4 and the second pressing roller 5, and the other set of the clamping assembly 7 is located on the side of the third pressing roller 6 away from the second pressing roller 5.

[0036] Refer to Figure 1 , At the end of the bottom of the frame 1 away from the first motor 101, a second motor 103 is installed. The output shaft of the second motor 103 is connected to a second transmission box 104 through a coupling. On the frame 1, a second driving shaft 10 is rotatably connected. There are two second driving shafts 10 and they are arranged vertically at intervals. One end of the second driving shaft 10 near the second transmission box 104 is connected to the second transmission box 104 through a coupling. On the second driving shaft 10, three second driving rollers 1001 are welded. The three second driving rollers 1001 are arranged at intervals along the length direction of the second driving shaft 10.

[0037] Refer to Figure 1 , A counting assembly 9 is arranged on the frame 1. The counting assembly 9 is arranged on one side of the frame 1 where the second transmission box 104 is located, and is located on the side of the second transmission box 104 near the adjusting assembly 8. At the end of the frame 1 away from the placing roller 2, a fourth pressing roller 11 is rotatably connected. There are two fourth pressing rollers 11 and they are arranged vertically at intervals.

[0038] When using this loading machine, place the metal coil 201 on the placing roller 2, pass one end of the metal coil 201 through between the two first driving rollers, rotate the first driving wheel to push the metal coil 201 to the first pressing roller 4, and the metal coil 201 passes through between the two first pressing rollers 4. When the metal coil 201 passes through the clamping assembly 7, both sides of the metal coil 201 are clamped by the clamping assembly 7. Subsequently, the metal coil 201 passes through the gap between the two second pressing rollers 5. When the metal coil 201 passes through the gap between the third pressing rollers 6, multiple groups of third pressing rollers 6 flatten the metal coil 201. Then the metal coil 201 is limited by another group of clamping assemblies 7 to ensure that the metal coil 201 can be stably clamped by the loading machine. The metal coil 201 passes through the counting assembly 9, and the counting assembly 9 records the length of the metal coil 201 output by the loading machine, facilitating the processing of the metal coil 201 by the staff in subsequent processes. The metal coil 201 passes through the gap between the two second driving shafts 10. The second driving roller 1001 rotates to drive the metal coil 201 to move in the discharging direction of the loading machine. Finally, the metal coil 201 passes through between the two fourth pressing rollers 11 and moves to the discharging end of the loading machine for subsequent processing.

[0039] After the metal coil 201 is pulled out from the placing roller 2, the rotation of the first driving roller 301 and the second driving roller 1001 drives the metal coil 201 to move in the loading machine, ensuring that the metal coil 201 moves at a uniform speed. The metal coil 201 passes through the first pressing roller 4, the second pressing roller 5, the third pressing roller 6, and the fourth pressing roller 11 in sequence, which can ensure that the surface of the metal coil 201 is unfolded and kept flat, facilitating the subsequent processing of the metal coil 201. The clamping assembly 7 can limit the surface and both sides of the metal coil 201. When the metal coil 201 deviates, the adjusting assembly 8 can drive the clamping assembly 7 to move on the frame 1 and adjust the angle of the clamping assembly 7 according to the deviation angle of the metal coil 201, ensuring that the loading machine firmly clamps the metal coil 201 and moves smoothly, reducing the manual adjustment steps of the staff during the operation of the loading machine and ensuring the safety of the staff.

[0040] Refer to Figure 2, the clamping assembly 7 includes slide bars 701. There are two slide bars 701 which are arranged at intervals along the length direction of the frame 1. The length direction of the slide bars 701 is perpendicular to the length direction of the frame 1. A slider 702 is slidably connected to the two slide bars 701 together. There are two sliders 702 which are arranged at intervals along the length direction of the slide bars 701. The two ends of the slider 702 in the length direction respectively pass through and are slidably connected to the two slide bars 701. An installation frame 703 is connected to the two slide bars 701 together. The installation frame 703 is located below the slide bars 701 and the top of the installation frame 703 is welded to the two ends of the slide bars 701. A pneumatic push rod 704 is installed at the bottom of the installation frame 703. The output end of the pneumatic push rod 704 is fixedly connected to the slider 702 away from the pneumatic push rod 704 by bolts. A gear 705 is rotatably connected to the installation frame 703. The gear 705 meshes with racks 706 on both sides along the length direction of the slide bars 701. One end of the rack 706 is welded to a slider 702, and the other end of the rack 706 is slidably connected to the other slider 702. When the slider 702 connected to the pneumatic push rod 704 moves, the rack 706 and the gear 705 drive the other slider 702 to move, so that the two sliders 702 move along the slide bars 701 in the direction of approaching or separating from each other.

[0041] When the metal coil 201 passes through the clamping assembly 7, the output end of the pneumatic push rod 704 contracts, driving the slider 702 connected to the pneumatic push rod 704 to move along the slide bar 701. At the same time, the rack 706 drives the gear 705 to rotate, driving the other slider 702 to move along the slide bar 701. The two sliders 702 move towards each other along the slide bar 701 to clamp both ends of the metal coil 201, clamping both sides in the length direction of the metal coil 201. By the contraction of the pneumatic push rod 704 to drive the slider 702 to move, and at the same time the gear 705 and the rack 706 drive the two sliders 702 to move towards each other, the slider 702 can move and continuously clamp both sides in the length direction of the metal coil 201, reducing the manual operation steps of the staff when the feeding machine works and ensuring the safety of the staff.

[0042] Refer to Figure 3 , a chute 7021 is provided on one side of the two sliders 702 facing each other. The chute 7021 is opened along the length direction of the slider 702 where it is located, and both ends of the chute 7021 communicate with the two end faces of the slider 702 in the length direction. A chamfer is formed at the connection between the bottom of the chute 7021 and the side walls at both ends of the slider 702 in the length direction. A limiting roller 7022 is rotatably connected to each of the two chutes 7021. The two limiting rollers 7022 are respectively vertically arranged in the chutes 7021 where they are located.

[0043] When the metal coil 201 is clamped and moved by the slider 702, both sides in the length direction of the metal coil 201 are embedded in the chute 7021. The chute 7021 will limit both sides of the metal coil 201 to ensure that the metal coil 201 does not escape from the clamping assembly 7 when it stops moving. The chamfers provided at both ends in the length direction of the chute 7021 can reduce the wear of the slider 702 when the metal coil 201 moves. When the metal coil 201 is offset, both sides in the length direction of the metal coil 201 are in contact with the limiting roller 7022, which can ensure that the metal coil 201 is not stuck by the slider 702 and ensure that the adjusting assembly 8 can drive the clamping assembly 7 to adjust to a suitable clamping angle.

[0044] Referring to Figure 2 , the adjusting assembly 8 includes an adjusting frame 801. The adjusting frame 801 is slidably arranged on the frame 1. There are two adjusting frames 801, which are respectively located at both ends of the sliding rod 701. Both ends in the length direction of the adjusting frame 801 are sleeved and slidably connected with the two sliding rods 701 respectively. An adjusting groove 8011 is opened along the length direction of the frame 1 at the connection of the adjusting frame 801 on the frame 1. An adjusting rod 802 is vertically penetrated through the midpoint in the length direction of the adjusting frame 801. The bottom of the adjusting rod 802 is inserted into and slides in the adjusting groove 8011, and the diameter of the adjusting rod 802 is smaller than the width of the adjusting groove 8011. When the clamping angle of the clamping assembly 7 changes, the adjusting rods 802 at both ends of the clamping assembly 7 slide along the adjusting groove 8011, and at the same time, the sliding rods 701 penetrated through the adjusting frame 801 move, and the adjusting frame 801 rotates to change the clamping angle of the clamping assembly 7.

[0045] When the feeder is working, after the metal coil 201 is offset, the offset of the metal coil 201 will increase the friction force between the metal coil 201 and the clamping assembly 7, thereby pushing the clamping assembly 7. The clamping assembly 7 drives the adjusting rod 802 to move in the adjusting groove 8011, and at the same time, the sliding rod 701 slides in the adjusting frame 801 to ensure the support of the adjusting frame 801 for the clamping assembly 7. The clamping angle of the clamping assembly 7 is adjusted by the movement of both ends of the adjusting assembly 8 on the frame 1, ensuring the stable clamping of the metal coil 201 by the feeder, reducing the manual operation steps of the staff when the feeder is working, and ensuring the safety of the staff.

[0046] Referring to Figure 4, the counting component 9 includes an adjusting screw 901 which is threadedly connected to the frame 1. The top end of the adjusting screw 901 is connected to a cross bar 902. One end of the cross bar 902 away from the adjusting screw 901 is fixedly connected with an adjusting plate 904 through a U-shaped bolt 903. On the plate surface of the adjusting plate 904, there are mounting holes 9041 for mounting the U-shaped bolt 903. The mounting holes 9041 are strip-shaped and the length direction of the mounting holes 9041 is the same as the length direction of the adjusting plate 904. There are two mounting holes 9041 which are spaced along the width direction of the adjusting plate 904. The bottom of the adjusting plate 904 is hinged with a mounting plate 905. A counter 906 is mounted at the bottom of the mounting plate 905. On the plate surface of the mounting plate 905 on the side away from the counter 906, a guiding column 907 is welded. A limiting plate is welded on the adjusting plate 904 near the mounting plate 905. One end of the guiding column 907 away from the mounting plate 905 passes through the limiting plate and extends above the limiting plate. A limiting nut 908 is threadedly connected to one end of the guiding column 907 away from the mounting plate 905. An elastic member 909 is sleeved on the guiding column 907. The elastic member 909 is located between the mounting plate 905 and the limiting plate. In this embodiment, the elastic member 909 is a spring.

[0047] When using this feeding machine, first rotate the adjusting screw 901 to adjust the length of the adjusting screw 901 extending out of the frame 1. Connect one end of the cross bar 902 to the top end of the adjusting screw 901. After placing the adjusting plate 904 at a suitable height, use the U-shaped bolt 903 to pass through the mounting hole 9041 to fix the adjusting plate 904. When the counter 906 is working, the mounting plate 905 rotates under the elastic force of the elastic member 909, so that the counter 906 closely adheres to the end face of the metal coil 201. When the end face of the metal coil 201 is uneven, the mounting plate 905 rotates with the undulation of the end face of the metal coil 201, ensuring that the counter 906 closely adheres to the end face of the metal coil 201. After the feeding machine stops working, the guiding rod and the limiting nut 908 will limit the rotation angle of the mounting plate 905, ensuring that the counter 906 will not collide with the end of the metal coil 201 during the next feeding. Through the telescoping of the guiding column 907 and the elastic force of the elastic member 909, the counter 906 closely adheres to the plate surface of the metal coil 201, ensuring that the counter 906 closely adheres to the end face of the metal coil 201 during work and accurately counts, reducing the manual operation steps of the staff when the feeding machine is working and ensuring the safety of the staff.

[0048] This specific embodiment is only an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. An adjustable steel plate feeder for metal tile production, characterized in that: The loading machine comprises a frame (1) and a placing roller (2) for placing a metal coil, the frame (1) is provided with a first pressing roller (4), a second pressing roller (5) and a third pressing roller (6), at least two of each of the first pressing roller (4), the second pressing roller (5) and the third pressing roller (6), the frame (1) is provided with a clamping assembly (7) for clamping the metal coil (201), the clamping assembly (7) is connected to an adjusting assembly (8), and the clamping assembly (7) is connected to the frame (1) via the adjusting assembly (8), and a counting assembly (9) is provided on the frame (1); The clamping assembly (7) comprises a sliding rod (701), the sliding rod (701) is slidably connected to a sliding block (702), and the sliding block (702) is provided with at least two pieces.

2. The adjustable steel plate feeding machine for metal tile production according to claim 1, characterized in that: The clamping assembly (7) also includes a mounting frame (703), the mounting frame (703) is fixedly connected to the slide bar (701), a pneumatic push rod (704) is installed on the mounting frame (703), the output end of the pneumatic push rod (704) is fixedly connected to a slider (702), a gear (705) is rotatably connected to the mounting frame (703), the gear (705) is meshed with a rack (706), two racks (706) are provided, and one end of the two racks (706) is respectively fixedly connected to the two sliders (702), and the other end is respectively slidably connected to the two sliders (702).

3. The adjustable steel plate feeding machine for metal tile production according to claim 2, characterized in that: A sliding groove (7021) is provided on one side of the sliding block (702).

4. The adjustable steel plate feeding machine for metal tile production according to claim 3 is characterized in that: The connection between the bottom of the slide groove (7021) and the side wall of the slide block (702) is processed to form a chamfer.

5. The adjustable steel plate feeding machine for metal tile production according to claim 4, characterized in that: A limiting roller (7022) is rotatably arranged in the slide groove (7021).

6. The adjustable steel plate feeding machine for metal tile production according to claim 1, characterized in that: The adjustment assembly comprises an adjustment frame (801) slidably arranged on the frame (1), the adjustment frame (801) being provided with at least two adjustment slots (8011) respectively sleeved and slid on the two ends of the slide bar (701), the frame (1) being provided with at least two adjustment slots (8011), the two adjustment slots (8011) being respectively located on the two sides of the frame (1), an adjustment rod (802) being passed through the adjustment frame (801), a section of the adjustment rod (802) being inserted into and slidable in the adjustment slot (8011), and the diameter of the adjustment rod (802) being smaller than the width of the adjustment slot (8011).

7. The adjustable steel plate feeding machine for metal tile production according to claim 6, characterized in that: The counting assembly (9) comprises an adjusting screw (901) threadedly connected to the frame (1); a cross bar (902) is fixedly connected to the adjusting screw (901); an adjusting plate (904) is fixedly connected to the cross bar (902); a mounting plate (905) is connected to one side of the adjusting plate (904); and a counter (906) is mounted on the mounting plate (905).

8. The adjustable steel plate feeding machine for metal tile production according to claim 7, characterized in that: The adjusting plate (904) is hinged to the mounting plate (905); a guide column (907) is fixedly connected to the mounting plate (905); a limiting plate is fixedly connected to the adjusting plate (904); one end of the guide column (907) passes through the limiting plate and is threadedly connected to the limiting nut (908); an elastic member (909) is sleeved on the peripheral wall of the guide column (907); and the elastic member (909) is located between the mounting plate (905) and the limiting plate.

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