Laser edge bonding machine with laser marking equipment

Abstract

The invention provides a laser edge bonding machine with laser marking equipment, and relates to the technical field of laser processing, the laser edge bonding machine comprises a laser edge bonding machine body, the laser edge bonding machine body comprises a front-end conveying mechanism, a rear-end conveying mechanism, a feeding mechanism and a mark removing monitoring mechanism, the inner side of the front-end conveying mechanism and the inner side of the rear-end conveying mechanism are each sleeved with a conveying belt, and the inner side of the conveying belt is provided with a laser marking device; the front-end conveying mechanism and the rear-end conveying mechanism are welded and fixed, a side baffle is welded to the top of the front-end conveying mechanism, and extension plates are in threaded connection with the two sides of the side baffle. According to the edge sealing strip butt-joint device, edge sealing strips cut in advance can be in butt joint with the edges of moved plates at a small bending angle, the butt-joint accuracy is improved, and the butt-joint efficiency is improved. And the problem that due to the fact that the edge sealing strip is in a large-angle bending state for a long time, the later pasting firmness is reduced is also solved, extruded polymer residues can be cleaned through cooperation with the mark removing monitoring mechanism, and the deviation problem generated after edge sealing is monitored and detected.

Description

Technical Field

[0001] The invention relates to the technical field of laser processing, in particular to a laser edge banding machine with laser marking equipment. Background Art

[0002] Laser edge banding machine is a high-end equipment used in the field of furniture manufacturing. It is mainly used for edge banding of panels to achieve seamless connection and improve the appearance quality of products. Its core technology is to melt the functional layer of the edge banding tape through a laser beam so that it is tightly combined with the panel, thereby achieving efficient, accurate and environmentally friendly edge banding effect. Using a high-energy rectangular laser spot, the functional layer of the edge banding tape is quickly melted, and the edge banding tape is tightly attached to the panel through a pressing wheel. This process does not require traditional glue, reduces material loss and secondary operations, and improves edge banding efficiency and quality. At the same time, the laser edge banding machine is generally equipped with a laser marking device to display the information of the panel.

[0003] The laser edge banding machine in the prior art needs to press the edge banding strip after edge banding to ensure tight adhesion, but this process will also cause the melted adhesive layer polymer to be easily squeezed outward, thereby causing polymer residues on the edge, which will need to be cleaned again later. The operation steps are cumbersome, and there is a certain probability that the edge banding strip will be offset during the extrusion process, and slight offsets cannot be detected in time. Summary of the invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a laser edge banding machine with a laser marking device to solve the problems raised in the above-mentioned background technology. The present invention can connect the edge banding strip that has been cut in advance with the edge of the moved plate at a smaller bending angle, thereby improving the accuracy of the connection and avoiding the problem that the edge banding strip is in a large-angle bending state for a long time, resulting in a decrease in the firmness of the subsequent adhesion. In conjunction with the trace removal monitoring mechanism, the extruded polymer residue can be cleaned and the offset problem caused after the edge banding can be monitored and detected.

[0005] In order to achieve the above-mentioned objectives, the present invention is implemented through the following technical solutions: a laser edge banding machine with a laser marking device, comprising a laser edge banding machine body, the laser edge banding machine body comprising a front-end conveying mechanism, a rear-end conveying mechanism, a feeding mechanism and a mark removal monitoring mechanism, the inner sides of the front-end conveying mechanism and the rear-end conveying mechanism are both sleeved with conveyor belts, and the front-end conveying mechanism and the rear-end conveying mechanism are welded and fixed, a side baffle is welded on the top of the front-end conveying mechanism, extension plates are screwed on both sides of the side baffles, a laser is screwed on the bottom of one of the extension plates, and a marking module is installed on the bottom of the other extension plate, a feeding mechanism is interspersed on the surface of the side baffle, a mark removal monitoring mechanism and a positioning component are built on the surface of the rear-end conveying mechanism, the mark removal monitoring mechanism comprises a pressing mechanism and a glue removal mechanism, the cut edge banding strips are stacked on the inner side of the feeding mechanism, and the plates that need to be edge banded are moved over the top of the front-end conveying mechanism and the rear-end conveying mechanism in turn.

[0006] Furthermore, the front-end conveying mechanism and the rear-end conveying mechanism both include a conveyor belt, a motor and a panel. The panel is installed on both sides of the conveyor belt. The motor is screwed to one end of the panel. A positioning column is inserted on the inner wall of the panel. The motor is used to drive the conveyor belt to rotate in a circle.

[0007] Furthermore, the positioning assembly includes a first bracket, a pneumatic channel and a limit stop rod. The bottom of the first bracket is welded to the enclosure of the rear-end conveying mechanism. The outer side of the first bracket is screwed with a pneumatic channel. One end of the pneumatic channel is connected to the limit stop rod, and the end of the pneumatic channel is connected to an air supply pipe.

[0008] Furthermore, there are two side baffles, and a gap is provided between the two side baffles. The feeding mechanism includes a first electric lifting rod, a second electric lifting rod, a supporting rod and a pressing rod. A base is welded on the outer side of the side baffle.

[0009] Furthermore, the bottoms of the first electric lifting rod and the second electric lifting rod are screwed to the surface of the base, the tops of the first electric lifting rod and the second electric lifting rod are screwed to the end plates, the surface of the side baffle is provided with a strip hole, the support rod and the pressing rod pass through the inside of the strip hole, and both ends of the support rod and the pressing rod are welded to the side of the end plate.

[0010] Furthermore, the support rod is used to support the bottom of the edge banding strip, and the pressing rod is used to press the top of the edge banding strip. There are two support rods, and the two support rods are always on the same horizontal plane. There is one pressing rod.

[0011] Furthermore, a second bracket is provided on the side of the trace removal monitoring mechanism, the bottom of the second bracket is welded to the enclosure, a lifting groove is provided on the surface of the second bracket, the glue removal mechanism includes a glue removal bin and a shovel plate, the top of the glue removal bin is integrally formed with a back plate, a spring rod is inserted on the surface of the back plate, and the end of the spring rod is connected to the shovel plate.

[0012] Furthermore, the bottom of the shovel plate is pressed on the top of the glue removal bin, and conductive wires are inserted into the inside of the shovel plate and the top of the glue removal bin. The top of the glue removal bin is in an open state, and a lifting block is integrally formed at the rear end of the back plate. A vertical plate is welded to the rear end of the lifting block, and a top plate is welded to the top of the vertical plate.

[0013] Furthermore, a first threaded rod is inserted in the middle of the top plate, and the bottom end of the first threaded rod is movably connected to the surface of the second bracket through a bearing, and the pressing mechanism includes a pressing wheel and a linkage plate.

[0014] Furthermore, the bottom of the linkage plate is inserted at both ends of the pressing wheel, a guide rod is welded to the top of the linkage plate, a second threaded rod is inserted in the middle of the second bracket, the bottom end of the second threaded rod is movably connected to the surface of the linkage plate through a bearing, and the guide rod passes through the top of the second bracket.

[0015] Beneficial effects of the present invention: 1. The laser edge banding machine with laser marking equipment can dock the pre-cut edge banding strips with the edge of the moved plate at a smaller bending angle. The plate to be edge-banded at the bottom is moved and controlled by the positioning component at the rear end to ensure that the top edge banding strip can be accurately docked with the end of the plate, which improves the accuracy of docking and avoids the problem of reduced firmness of later bonding due to the edge banding strip being in a large-angle bending state for a long time.

[0016] 2. The laser edge banding machine with laser marking equipment can clean the extruded polymer residues in conjunction with the trace removal monitoring mechanism. Even if a large extrusion force is provided, causing the polymer in some bonding areas to overflow outward, the glue removal mechanism can scrape off the overflowed residues as the plate moves, thereby achieving the purpose of cleaning.

[0017] 3. The laser edge banding machine with laser marking equipment monitors and detects the offset problem after edge banding. When the processed edge banding strip is offset laterally, the scraper part in the glue removal mechanism will shake, which will cause the internal circuit signal to be disconnected, thereby monitoring the offset of the current edge banding strip. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic structural diagram of the appearance of a laser edge banding machine with a laser marking device according to the present invention; Figure 2 It is a structural schematic diagram of a positioning component part of the present invention; Figure 3 It is a structural schematic diagram of the trace removal monitoring mechanism of the present invention; Figure 4 It is a structural schematic diagram of the adhesive removal mechanism of the present invention; Figure 5 It is a structural diagram of the pressing mechanism part of the present invention; Figure 6 It is a schematic diagram of the feeding mechanism part of the present invention; Figure 7 This is a disassembled diagram of the feeding mechanism of the present invention; In the figure: 1. front conveying mechanism; 2. rear conveying mechanism; 3. side baffle; 4. feeding mechanism; 5. mark removal monitoring mechanism; 6. positioning assembly; 7. conveyor belt; 8. enclosure; 9. positioning column; 10. motor; 11. first bracket; 12. pneumatic channel; 13. limit stopper; 14. air supply pipeline; 15. second bracket; 16. lifting slot; 17. pressing mechanism; 18. glue removal mechanism; 19. glue discharge bin; 20. back plate; 21 , shovel plate; 22, spring rod; 23, conductive wire; 24, lifting block; 25, vertical plate; 26, top plate; 27, first threaded rod; 28, pressing wheel; 29, linkage plate; 30, second threaded rod; 31, guide rod; 32, strip hole; 33, extension plate; 34, laser; 35, marking module; 36, base; 37, first electric lifting rod; 38, second electric lifting rod; 39, end plate; 40, support rod; 41, pressing rod. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below in conjunction with specific implementation methods.

[0020] See also Figures 1 to 7The present invention provides the following technical solutions: a laser edge banding machine with a laser marking device, comprising a laser edge banding machine body, the laser edge banding machine body comprising a front-end conveying mechanism 1, a rear-end conveying mechanism 2, a feeding mechanism 4 and a mark removal monitoring mechanism 5, the inner sides of the front-end conveying mechanism 1 and the rear-end conveying mechanism 2 are both sleeved with a conveyor belt 7, and the front-end conveying mechanism 1 and the rear-end conveying mechanism 2 are welded and fixed, a side baffle 3 is welded on the top of the front-end conveying mechanism 1, and extension plates 33 are screwed on both sides of the side baffle 3, a laser 34 is screwed on the bottom of one extension plate 33, and a marking module 35 is installed on the bottom of the other extension plate 33, the surface of the side baffle 3 is interspersed with a feeding mechanism 4, the surface of the rear-end conveying mechanism 2 is built with a mark removal monitoring mechanism 5 and a positioning component 6, the mark removal monitoring mechanism 5 comprises a pressing mechanism 17 and a glue removal mechanism 18, the inner side of the feeding mechanism 4 is stacked with cut edge banding strips, and the plates that need to be edge banded are moved from the top of the front-end conveying mechanism 1 and the top of the rear-end conveying mechanism 2 in turn. The laser edge banding machine is used to perform edge banding on the plate, and can also perform marking on the plate after edge banding.

[0021] When the present invention is used, the plate to be edge-sealed is directly placed on the front conveying mechanism 1 in a vertical posture, and the plate is conveyed by the conveyor belt 7 in the conveying mechanism until it moves to the inner side of the side baffle 3, and the cut edge-sealing strip materials are stacked in the side baffle 3, and the length and width of each edge-sealing strip are the same as the size specifications of the plate facing the top side. When the plate moves to the inner side of the side baffle 3 and the end is aligned with the end of the stacked edge-sealing strips, the feeding mechanism 4 can be operated to apply downward pressure to the top of the rear end of the stacked edge-sealing strips. The pressure makes the end of the bottom edge banding fit with the edge of the plate, and at the same time, the bottom functional layer of the edge banding is irradiated and melted by the laser 34 to form a bondable liquid polymer, and with the pressing of the feeding mechanism 4, the adhesive material can come into contact and adhere to the edge of the plate, and finally the pasted plate and the edge banding are moved toward the rear end along the front conveying mechanism 1 until they move to the mark removal monitoring mechanism 5, which presses the edge banding, scrapes and cleans the edge of the edge banding, and monitors whether the edge banding is offset.

[0022] In this embodiment, the front conveying mechanism 1 and the rear conveying mechanism 2 both include a conveyor belt 7, a motor 10 and a panel 8. The panel 8 is installed on both sides of the conveyor belt 7. The motor 10 is screwed to one end of the panel 8. A positioning column 9 is inserted on the inner wall of the panel 8. The motor 10 is used to drive the conveyor belt 7 to circulate. The positioning assembly 6 includes a first bracket 11, a pneumatic channel 12 and a limit stop rod 13. The bottom of the first bracket 11 is welded to the panel 8 of the rear conveying mechanism 2. The outer side of the first bracket 11 is screwed with a pneumatic channel 12. One end of the pneumatic channel 12 is connected to the limit stop rod 13. The end of the pneumatic channel 12 is connected to an air supply pipe 14.

[0023] Specifically, the front-end conveying mechanism 1 and the rear-end conveying mechanism 2 cooperate with each other to convey the plates, and the inner side of the enclosure 8 limits the position of the plates by the positioning columns 9 to ensure that the plates can move along the middle area of ​​the conveyor belt 7. While the motor 10 controls the rotation of the conveyor belt 7, the pneumatic channel 12 is controlled by an external control system to inflate or deflate, so that the extension state of the limit lever 13 can be regulated, thereby blocking the plates in the moving process. After the plates after edge sealing are blocked, the subsequent plates can be blocked synchronously to make them stationary. Therefore, the edge banding strip is docked and pressed with the bottom plate by means of this stationary state, thereby reducing the probability of displacement caused by the initial docking during the movement.

[0024] In this embodiment, the number of the side baffles 3 is two, and a gap is set between the two side baffles 3. The feeding mechanism 4 includes a first electric lifting rod 37, a second electric lifting rod 38, a supporting rod 40 and a pressing rod 41. The outer side of the side baffle 3 is welded with a base 36. The bottoms of the first electric lifting rod 37 and the second electric lifting rod 38 are both screwed to the surface of the base 36, and the tops of the first electric lifting rod 37 and the second electric lifting rod 38 are both screwed to the end plate 39. The surface of the side baffle 3 is provided with a strip hole 32, and the supporting rod 40 and the pressing rod 41 pass through the inside of the strip hole 32, and the two ends of the supporting rod 40 and the pressing rod 41 are welded to the side of the end plate 39. The supporting rod 40 is used to support the bottom of the edge banding strip, and the pressing rod 41 is used to press the top of the edge banding strip. The number of the supporting rods 40 is two, and the two supporting rods 40 are always on the same horizontal plane. The number of the pressing rod 41 is one. The edge banding strip that has been cut in advance can be connected to the edge of the moved plate at a smaller bending angle. The bottom plate to be edge-sealed is moved and controlled by the positioning component 6 at the rear end to ensure that the top edge banding strip can be accurately connected to the end of the plate, thereby improving the accuracy of the connection and avoiding the problem of reduced firmness of the subsequent bonding caused by the edge banding strip being in a large-angle bending state for a long time.

[0025] Specifically, the upper end plate 39 and the support rod 40 are lifted by the first electric lifting rod 37, so that the edge strips stacked on the inner side of the side baffle 3 can be lifted synchronously, and the second electric lifting rod controls the end plate 39 and the docking pressing rod 41 to apply downward pressure, so that the rear end area of ​​the stacked edge strips can be applied with a downward extrusion force. With the help of this extrusion force, it can be ensured that the end of the lowest edge strip is first in contact and fit with the rear end of the moved plate, and at the same time, the bottom of the edge strip can also be formed into an inclined state with a smaller angle. Therefore, the laser beam generated by the laser 34 can be used to irradiate the bottom surface of the edge strip that is about to come into contact with the plate with the help of this inclined state, so as to melt the functional layer on the bottom surface for subsequent bonding.

[0026] In this embodiment, the side of the trace removal monitoring mechanism 5 is provided with a second bracket 15, the bottom of the second bracket 15 is welded to the enclosure 8, and the surface of the second bracket 15 is provided with a lifting groove 16. The glue removal mechanism 18 includes a glue removal bin 19 and a shovel plate 21. The top of the glue removal bin 19 is integrally formed with a back plate 20, and the surface of the back plate 20 is plugged with a spring rod 22, and the end of the spring rod 22 is connected to the shovel plate 21. The bottom of the shovel plate 21 is pressed on the top of the glue removal bin 19, and the inside of the shovel plate 21 and the top of the glue removal bin 19 are both plugged with conductive wires 23. The top of the glue removal bin 19 is in an open state, and the rear end of the back plate 20 is integrally formed with a lifting block 24, and the rear end of the lifting block 24 is welded with a vertical plate 25, and the top of the vertical plate 25 is welded with a top plate 26. A first threaded rod 27 is inserted in the middle of the top plate 26, and the bottom end of the first threaded rod 27 is movably connected to the surface of the second bracket 15 through a bearing. The pressing mechanism 17 includes a pressing wheel 28 and a linkage plate 29. The bottom of the linkage plate 29 is inserted at both ends of the pressing wheel 28, and a guide rod 31 is welded to the top of the linkage plate 29. A second threaded rod 30 is inserted in the middle of the second bracket 15, and the bottom end of the second threaded rod 30 is movably connected to the surface of the linkage plate 29 through a bearing, and the guide rod 31 passes through the top of the second bracket 15. In conjunction with the trace removal monitoring mechanism 5, the extruded polymer residue can be cleaned. Even if a large extrusion force is provided, causing the polymer in part of the bonding area to overflow outward, the glue removal mechanism 18 can scrape off the overflowed residue as the plate moves, thereby achieving the purpose of cleaning.

[0027] Specifically, after the plate with the edge banding pasted is moved to the bottom of the pressing wheel 28, the pressing wheel 28 can be used to apply downward pressure to the top of the edge banding, thereby improving the firmness of the edge banding after pasting, and the pressing height of the pressing wheel 28 can be directly adjusted by rotating the second threaded rod 30 at the top, and the pressing wheel 28 can be made to perform vertical lifting and lowering movements at all times in conjunction with the guide rod 31.

[0028] The offset problem after edge banding is monitored and investigated. When the processed edge banding strip is laterally offset, the scraper plate 21 in the glue removal mechanism 18 will shake, which will cause the internal circuit signal to be disconnected, thereby monitoring the offset of the current edge banding strip. Specifically, the connection position between the bottom of the shovel plate 21 and the degumming bin 19 is consistent with the height at which the edge banding is bonded to the plate. Therefore, after the edge banding is bonded to the plate, when it moves from the inner side of the degumming mechanism 18, the shovel plate 21 can provide a pressing and scraping effect on the connection position between the edge banding and the plate. After part of the bonded polymer overflows toward the outside due to the pressure applied by the pressing mechanism 17, it can be scraped off by the shovel plate 21 and collected in the degumming bin 19 to the inside. When the bonding position of the edge banding is offset, the edge banding protrudes toward one side, which applies a thrust to the shovel plate 21, thereby compressing the spring rod 22, and the conductive wire 23 on the shovel plate 21 is offset from the conductive wire 23 on the degumming bin 19. Therefore, the monitoring circuit generates a disconnection signal, and the current offset problem of the edge banding is judged by the signal. The entire degumming mechanism 18 can also control the vertical plate 25 to rise and fall by rotating the first threaded rod 27 at the top, so as to be applied to processing plates of different sizes.

[0029] The basic principles and main features of the present invention and the advantages of the present invention are shown and described above. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention.

[0030] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A laser edge banding machine with a laser marking device, comprising a laser edge banding machine body, characterized in that: The laser edge banding machine body comprises a front conveying mechanism (1), a rear conveying mechanism (2), a feeding mechanism (4) and a mark removal monitoring mechanism (5); a conveyor belt (7) is sleeved on the inner sides of the front conveying mechanism (1) and the rear conveying mechanism (2); the front conveying mechanism (1) and the rear conveying mechanism (2) are welded and fixed to each other; a side baffle (3) is welded on the top of the front conveying mechanism (1); extension plates (33) are screwed on both sides of the side baffle (3); a laser ( 34), a marking module (35) is installed at the bottom of the other extension plate (33), a feeding mechanism (4) is inserted into the surface of the side baffle (3), a mark removal monitoring mechanism (5) and a positioning assembly (6) are built on the surface of the rear end conveying mechanism (2), the mark removal monitoring mechanism (5) includes a pressing mechanism (17) and a glue removal mechanism (18), and the inner side of the feeding mechanism (4) is stacked with cut edge banding strips, and the plates that need to be edge banded are moved over the top of the front end conveying mechanism (1) and the rear end conveying mechanism (2) in turn.

2. The laser edge banding machine with a laser marking device according to claim 1, characterized in that: The front conveying mechanism (1) and the rear conveying mechanism (2) both comprise a conveyor belt (7), a motor (10) and a panel (8), wherein the panel (8) is mounted on both sides of the conveyor belt (7), the motor (10) is screwed to one end of the panel (8), a positioning column (9) is inserted into the inner wall of the panel (8), and the motor (10) is used to drive the conveyor belt (7) to rotate in a circular motion.

3. The laser edge banding machine with laser marking equipment according to claim 2, characterized in that: The positioning assembly (6) comprises a first bracket (11), a pneumatic channel (12) and a limit stop rod (13); the bottom of the first bracket (11) is welded to the enclosure (8) of the rear-end conveying mechanism (2); the outer side of the first bracket (11) is screwed with the pneumatic channel (12); one end of the pneumatic channel (12) is connected to the limit stop rod (13); and the end of the pneumatic channel (12) is connected to an air supply pipe (14).

4. The laser edge banding machine with laser marking equipment according to claim 2, characterized in that: The number of the side baffles (3) is two, and a gap is provided between the two side baffles (3); the feeding mechanism (4) comprises a first electric lifting rod (37), a second electric lifting rod (38), a supporting rod (40) and a pressing rod (41); and a base (36) is welded to the outer side of the side baffle (3).

5. The laser edge banding machine with laser marking equipment according to claim 4, characterized in that: The bottoms of the first electric lifting rod (37) and the second electric lifting rod (38) are both screwed to the surface of the base (36); the tops of the first electric lifting rod (37) and the second electric lifting rod (38) are both screwed to the end plate (39); a strip hole (32) is provided on the surface of the side baffle plate (3); the support rod (40) and the pressing rod (41) pass through the inside of the strip hole (32); and both ends of the support rod (40) and the pressing rod (41) are welded to the side of the end plate (39).

6. The laser edge banding machine with laser marking equipment according to claim 5, characterized in that: The support rod (40) is used to support the bottom of the edge strip, and the pressing rod (41) is used to press the top of the edge strip. There are two support rods (40), and the two support rods (40) are always on the same horizontal plane. There is only one pressing rod (41).

7. The laser edge banding machine with laser marking equipment according to claim 4, characterized in that: A second bracket (15) is provided on the side of the trace removal monitoring mechanism (5); the bottom of the second bracket (15) is welded to the enclosure (8); a lifting groove (16) is provided on the surface of the second bracket (15); the glue removal mechanism (18) comprises a glue removal bin (19) and a shovel plate (21); a back plate (20) is integrally formed on the top of the glue removal bin (19); a spring rod (22) is inserted on the surface of the back plate (20); and the end of the spring rod (22) is connected to the shovel plate (21).

8. The laser edge banding machine with laser marking equipment according to claim 7, characterized in that: The bottom of the shovel plate (21) is pressed against the top of the glue removal bin (19), and conductive wires (23) are inserted into the interior of the shovel plate (21) and the top of the glue removal bin (19). The top of the glue removal bin (19) is in an open state. A lifting block (24) is integrally formed at the rear end of the back plate (20). A vertical plate (25) is welded to the rear end of the lifting block (24), and a top plate (26) is welded to the top of the vertical plate (25).

9. The laser edge banding machine with laser marking equipment according to claim 8, characterized in that: A first threaded rod (27) is inserted in the middle of the top plate (26), and the bottom end of the first threaded rod (27) is movably connected to the surface of the second bracket (15) via a bearing. The pressing mechanism (17) comprises a pressing wheel (28) and a linkage plate (29).

10. The laser edge banding machine with laser marking equipment according to claim 9, characterized in that: The bottom of the linkage plate (29) is inserted into the two ends of the pressing wheel (28), and a guide rod (31) is welded to the top of the linkage plate (29). A second threaded rod (30) is inserted in the middle of the second bracket (15), and the bottom end of the second threaded rod (30) is movably connected to the surface of the linkage plate (29) through a bearing, and the guide rod (31) passes through the top of the second bracket (15).

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