An automatic welding device for massage bag airbags

Abstract

This utility model discloses an automatic welding device for massage bag airbags, comprising a first material hopper feeding assembly, a middle mold cavity loading assembly, a second material hopper feeding assembly, a midpoint high-frequency welding assembly, upper and lower middle mold cavity stacking assemblies, and an outer ring high-frequency welding assembly arranged sequentially above the material conveyor belt of an assembly line. In this technical solution, materials are fed through the first material hopper feeding assembly and the assembly below it; the midpoint high-frequency welding assembly welds the material at its midpoint; the upper and lower middle mold cavity stacking assembly places the second piece of material into the middle mold cavity; and the outer ring high-frequency welding assembly welds the airbag. The welded finished material is then conveyed through a finished product discharge assembly and transferred from the material conveyor belt. This technical solution facilitates automated processing of airbags and effectively improves processing efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of airbag welding, conveying and transferring equipment, specifically to an automatic welding device for massage bag airbags. Background Technology

[0002] Car seat massage airbags are a common feature in car seats. They can relieve fatigue and pressure, and improve the comfort and safety of drivers and passengers. Currently, the welding process of car seat massage airbags is carried out using an assembly line. However, the processing efficiency of airbags is relatively low in the transfer, transportation and welding processes. In view of the problems exposed in the use of current airbag welding material conveying and transfer devices, it is necessary to improve and optimize the structure of an automatic welding device for massage bag airbags. Utility Model Content

[0003] To solve the above-mentioned technical problems, this utility model provides an automatic welding device for massage bag airbags, which is characterized by facilitating the feeding, conveying and welding of airbags, and effectively improving processing efficiency.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an automatic welding device for massage bag airbags, comprising a first material hopper feeding assembly, a middle mold cavity loading assembly, a second material hopper feeding assembly, a midpoint high-frequency welding assembly, upper and lower middle mold cavities stacking assembly, and an outer ring high-frequency welding assembly arranged sequentially above the material conveyor belt of the production line.

[0005] The first hopper material feeding assembly has a telescopic cylinder a vertically arranged, a connecting frame a connected to the output shaft at the bottom of the telescopic cylinder a, a material feeding negative pressure suction cup a for picking up materials at the bottom of the connecting frame a, and a telescopic cylinder b vertically downward arranged on one side of the telescopic cylinder a, with a clamp b connected to the telescopic end at the bottom of the telescopic cylinder b.

[0006] The middle mold cavity mounting assembly is vertically equipped with a telescopic cylinder c, and a clamp c for gripping materials is located at the bottom of the telescopic cylinder c.

[0007] The second hopper material feeding assembly is vertically equipped with a telescopic cylinder d. A connecting frame d is provided on the output shaft at the bottom of the telescopic cylinder d. Several negative pressure suction cups d for clamping and placing materials are fitted at the bottom of the connecting frame d.

[0008] The intermediate point high-frequency welding assembly has a telescopic rod a vertically downwardly arranged, a driven plate a connected to the output end of the telescopic rod a, and a high-frequency welding head a for welding the intermediate point of the material located at the bottom end of the driven plate a.

[0009] A telescopic cylinder e is vertically arranged in the upper and lower layer cavity stacking assembly. A clamp e is connected to the output shaft of the telescopic cylinder e. An extension plate is also sleeved on the output shaft of the telescopic cylinder e. Several telescopic rods e are vertically inserted through the outer edge of the extension plate. A pressure plate e is provided at the bottom end of the telescopic rods e.

[0010] A telescopic rod f is vertically downwardly arranged in the outer ring high-frequency welding assembly. A driven plate f is connected to the output shaft at the bottom end of the telescopic rod f. A high-frequency welding head f for welding the outer ring of the material is also arranged at the bottom end of the driven plate f.

[0011] As a preferred technical solution of the automatic welding device for massage bag airbags of this utility model, the first material hopper feeding assembly further includes a guide rail a horizontally arranged above the material conveyor belt of the production line. The guide rail a is arranged perpendicular to the material conveyor belt of the production line. A slidable driven block a is fitted into the bottom end of the guide rail a. The top end of the telescopic cylinder a is connected to the bottom end of the driven block a. A lead screw driven by a servo motor is also arranged parallel to the side of the guide rail a. The driven block a is screwed onto the driven block a and driven to move by the rotating lead screw.

[0012] A guide rail b is also provided on one side of the guide rail a. The guide rail b is set parallel to the material conveyor belt of the production line. A slidable driven block b is fitted at the bottom end of the guide rail b. The top end of the telescopic cylinder b is connected to the driven block b. The driven block b can be driven to move by a lead screw, and the driving displacement mode of the driven block b can be the same as that of the driven displacement mode of the driven block a.

[0013] As a preferred technical solution of the automatic welding device for massage bag airbags of this utility model, the middle mold cavity mounting component further includes a guide rail c horizontally arranged above the material conveyor belt of the production line. The guide rail c is arranged perpendicular to the material conveyor belt of the production line. A slidable driven block c is fitted into the bottom end of the guide rail c. The top end of the telescopic cylinder c is connected to the bottom end of the driven block c.

[0014] The driven block c can be displaced by a lead screw, and the driving displacement method of the driven block c can be the same as that of the driven block a.

[0015] As a preferred technical solution of the automatic welding device for massage bag airbags of this utility model, the second material hopper feeding assembly also includes a guide rail d horizontally arranged above the material conveyor belt of the production line. The guide rail d is arranged perpendicular to the material conveyor belt of the production line. A slidable driven block d is fitted into the bottom end of the guide rail d. The top end of the telescopic cylinder d is connected to the bottom end of the driven block d.

[0016] The driven block d can be driven to move by a lead screw, and the driving displacement method of the driven block d can be the same as that of the driven block a.

[0017] As a preferred technical solution of the automatic welding device for massage bag airbag of this utility model, the upper and lower layer middle mold cavity stacking assembly includes a guide rail e horizontally arranged above the material conveyor belt of the production line. The guide rail e is arranged parallel to the material conveyor belt of the production line. A slidable driven block e is fitted into the bottom end of the guide rail e. The top end of the telescopic cylinder e is connected to the bottom end of the driven block e.

[0018] The driven block e can be displaced by a lead screw, and the driving displacement method of the driven block e can be the same as that of the driven block a.

[0019] As a preferred technical solution of the automatic welding device for massage bag airbags of this utility model, the outer ring high-frequency welding assembly is further provided with a finished product discharge assembly at one end away from the upper and lower layer middle mold cavity stacking assembly. The finished product discharge assembly includes a guide rail g horizontally arranged above the material conveyor belt of the production line. The guide rail g is arranged perpendicular to the material conveyor belt of the production line. A slidable driven block g is fitted at the bottom end of the guide rail g. A telescopic cylinder g is connected to the bottom end of the driven block g. A clamp g is provided on the output shaft below the telescopic cylinder g. An extension plate is also provided at the bottom end of the output shaft of the telescopic cylinder g. A telescopic rod e is also provided on the extension plate. A pressure plate e is connected to the output shaft at the bottom end of the telescopic rod e.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows: In this technical solution, the material is fed by the first hopper material feeding component and the component set below it, the material is welded at the middle point by the middle point high-frequency welding component, the second piece of material is put into the middle mold cavity by the upper and lower layer middle mold cavity stacking component, the airbag is welded by the outer ring high-frequency welding component, and the finished material after welding is transported by the finished product discharge component and transferred from the material conveyor belt. This technical solution facilitates the automated processing of airbags and effectively improves processing efficiency. Attached Figure Description

[0021] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the sheet welding and conveying device in this utility model;

[0024] Figure 3 In this utility model Figure 2 A front view structural diagram;

[0025] Figure 4 This is a schematic diagram of the structure of the first hopper material feeding assembly in this utility model;

[0026] Figure 5 This is a schematic diagram of the component structure for adding components to the middle mold cavity in this utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the second hopper material feeding assembly in this utility model;

[0028] Figure 7 This is a schematic diagram of the midpoint high-frequency welding assembly structure in this utility model;

[0029] Figure 8 This is a schematic diagram of the upper and lower layer middle mold cavity stacking assembly structure in this utility model;

[0030] Figure 9 This is a schematic diagram of the outer ring high-frequency welding assembly structure in this utility model;

[0031] Figure 10 This is a schematic diagram of the finished product discharge component in this utility model;

[0032] Figure 11 In this utility model Figure 1 A magnified structural diagram at point A;

[0033] In the diagram: 1. First hopper material feeding assembly; 101. Guide rail a; 102. Driven block a; 103. Telescopic cylinder a; 104. Connecting frame a; 105. Material picking negative pressure suction cup a; 106. Guide rail b; 107. Driven block b; 108. Telescopic cylinder b; 109. Clamp b;

[0034] 2. Components added to the middle mold cavity; 201. Guide rail c; 202. Driven block c; 203. Telescopic cylinder c; 204. Fixture c;

[0035] 3. Second hopper material feeding assembly; 301. Guide rail d; 302. Driven block d; 303. Telescopic cylinder d; 304. Connecting frame d; 305. Negative pressure suction cup d;

[0036] 4. Midpoint high-frequency welding assembly; 401. Telescopic rod a; 402. Driven plate a; 403. High-frequency welding head a;

[0037] 5. Upper and lower layer middle mold cavity stacking assembly; 501. Guide rail e; 502. Driven block e; 503. Telescopic cylinder e; 504. Fixture e; 505. Extension plate; 506. Telescopic rod e; 507. Pressure plate e;

[0038] 6. Outer ring high-frequency welding assembly; 601. Telescopic rod f; 602. Driven plate f; 603. High-frequency welding head f;

[0039] 7. Finished product discharge assembly; 701. Guide rail g; 702. Driven block g; 703. Telescopic cylinder g; 704. Clamp g; 707. Finished product lifting frame. Detailed Implementation

[0040] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0041] like Figure 1-11 As shown, the automatic welding device for massage bag airbags disclosed in this utility model includes a first material hopper material feeding assembly 1, a middle mold cavity loading assembly 2, a second material hopper material feeding assembly 3, a middle point high frequency welding assembly 4, upper and lower middle mold cavity stacking assembly 5, and an outer ring high frequency welding assembly 6 arranged sequentially above the material conveyor belt of the production line.

[0042] The first material feeding assembly 1 has a telescopic cylinder a103 vertically installed. A connecting frame a104 is connected to the output shaft at the bottom of the telescopic cylinder a103. A material picking negative pressure suction cup a105 for picking up materials is installed at the bottom of the connecting frame a104. A telescopic cylinder b108 is also vertically downward installed on one side of the telescopic cylinder a103. A clamp b109 is connected to the telescopic end at the bottom of the telescopic cylinder b108.

[0043] The middle mold cavity mounting component 2 is vertically equipped with a telescopic cylinder c203, and a clamp c204 for gripping materials is located at the bottom of the telescopic cylinder c203.

[0044] The second hopper material feeding assembly 3 is vertically equipped with a telescopic cylinder d303. A connecting frame d304 is provided on the output shaft at the bottom of the telescopic cylinder d303. Several negative pressure suction cups d305 for clamping and placing materials are fitted at the bottom of the connecting frame d304.

[0045] In the high-frequency welding assembly 4 at the midpoint, a telescopic rod a401 is vertically downwardly arranged, a driven plate a402 is connected to the output end of the telescopic rod a401, and a high-frequency welding head a403 for welding the midpoint of the material is arranged at the bottom end of the driven plate a402.

[0046] A telescopic cylinder e503 is vertically arranged in the upper and lower layer middle mold cavity stacking assembly 5. A clamp e504 is connected to the output shaft of the telescopic cylinder e503. An extension plate 505 is also sleeved on the output shaft of the telescopic cylinder e503. Several telescopic rods e506 are vertically arranged through the outer edge of the extension plate 505. A pressure plate e507 is arranged at the bottom end of the telescopic rods e506.

[0047] A telescopic rod f601 is vertically downwardly arranged in the outer ring high-frequency welding assembly 6. A driven plate f602 is connected to the output shaft at the bottom end of the telescopic rod f601. A high-frequency welding head f603 for welding the outer ring of the material is also arranged at the bottom end of the driven plate f602.

[0048] Specifically, the first hopper material feeding assembly 1 also includes a guide rail a101 horizontally arranged above the material conveyor belt of the production line. The guide rail a101 is arranged perpendicular to the material conveyor belt of the production line. A slidable driven block a102 is fitted into the bottom end of the guide rail a101. The top end of the telescopic cylinder a103 is connected to the bottom end of the driven block a102. A lead screw driven by a servo motor is also arranged parallel to the side of the guide rail a101. The driven block a102 is screwed onto the driven block a102 and driven to move by the rotating lead screw.

[0049] A guide rail b106 is also provided on one side of the guide rail a101. The guide rail b106 is set parallel to the material conveyor belt of the production line. A sliding driven block b107 is fitted into the bottom end of the guide rail b106. The top of the telescopic cylinder b108 is connected to the driven block b107. The driven block b107 can be driven to move by a lead screw, and the driving displacement mode of the driven block b107 can be the same as the driving displacement mode of the driven block a102.

[0050] Specifically, the middle mold cavity mounting component 2 also includes a guide rail c201 horizontally arranged above the material conveyor belt of the production line. The guide rail c201 is perpendicular to the material conveyor belt of the production line. A slidable driven block c202 is fitted at the bottom end of the guide rail c201. The top end of the telescopic cylinder c203 is connected to the bottom end of the driven block c202. The driven block c202 can be driven to move by a screw, and the driving displacement mode of the driven block c202 can be the same as the driving displacement mode of the driven block a102. The second hopper material feeding component 3 also includes a guide rail d301 horizontally arranged above the material conveyor belt of the production line. The guide rail d301 is perpendicular to the material conveyor belt of the production line. A slidable driven block d302 is fitted at the bottom end of the guide rail d301. The top end of the telescopic cylinder d303 is connected to the bottom end of the driven block d302.

[0051] The driven block d302 can be driven to move by the lead screw, and the driving displacement method of the driven block d302 can be the same as that of the driven block a102.

[0052] Specifically, the upper and lower layer cavity stacking assembly 5 includes a guide rail e501 horizontally arranged above the material conveyor belt of the production line. The guide rail e501 is parallel to the material conveyor belt of the production line. A slidable driven block e502 is fitted into the bottom end of the guide rail e501. The top end of the telescopic cylinder e503 is connected to the bottom end of the driven block e502.

[0053] The driven block e502 can be displaced by a lead screw, and the driving displacement method of the driven block e502 can be consistent with the driving displacement method of the driven block a102. In this embodiment, the consistent driving method makes it easier for the operator to run the equipment.

[0054] Specifically, a finished product discharge assembly 7 is provided at the end of the outer ring high-frequency welding assembly 6 away from the upper and lower layer middle mold cavity stacking assembly 5. The finished product discharge assembly 7 includes a guide rail g701 horizontally arranged above the material conveyor belt of the production line. The guide rail g701 is arranged perpendicular to the material conveyor belt of the production line. A slidable driven block g702 is fitted at the bottom end of the guide rail g701. A telescopic cylinder g703 is connected to the bottom end of the driven block g702. A clamp g704 is provided on the output shaft below the telescopic cylinder g703. An extension plate 505 is also provided at the bottom end of the output shaft of the telescopic cylinder g703. A telescopic rod e506 is also provided on the extension plate 505. A pressure plate e507 is connected to the output shaft at the bottom end of the telescopic rod e506. In this embodiment, there are four telescopic rods e506 and four corresponding pressure plates e507. A finished product lifting frame 707 for lifting finished products is also provided below the finished product discharge assembly 7.

[0055] The working principle and usage process of this utility model: In the implementation process of this utility model, the bottom template and the middle mold cavity are placed side by side on the material conveyor belt of the production line for conveying. The bottom template is placed on the side of the material conveyor belt of the production line near the material loading of the hopper. When the equipment is running, the first material loading component 1 of the hopper is started. During this process, the driven block a102 slides on the guide rail a101 and adjusts its own horizontal position, thereby driving the telescopic cylinder a103 to move. After the telescopic cylinder a103 moves, the position of the connecting frame a104 and the material picking negative pressure suction cup a105 is adjusted, and the material in the hopper is placed on the bottom template to complete the loading of the first layer of material.

[0056] The conveyor line continues to operate, pushing the station with the first layer of material sheet placed to the next station. During the operation of the middle mold cavity loading component 2, the horizontal displacement of the driven block c202 is adjusted, and the positioning of the clamp c204 is adjusted by the telescopic cylinder c203, so that the clamp c204 moves to clamp the middle mold cavity from the middle mold cavity rotary station and places it on the first layer of material sheet.

[0057] After the middle mold cavity conveyor line is placed, it is pushed to the position below the second material bin material feeding assembly 3. At this time, the position serves as the second layer material feeding position. The negative pressure suction cup d305 in the second material bin material feeding assembly 3 operates in the same way as the components in the first material bin material feeding assembly 1, placing the material on the middle mold cavity.

[0058] After the second layer of sheet is placed, it is pushed to the middle point welding station, that is, the station where the middle point high frequency welding component 4 is located. The telescopic rod a401 in the middle point high frequency welding component 4 pushes the driven plate a402 and the high frequency welding head a403 to sink. The high frequency welding head a403 performs high frequency welding according to the set parameters, and welds eight middle points at the same time. After welding is completed, it is pushed to the middle mold cavity stacking station, that is, the station where the upper and lower middle mold cavity stacking components 5 are located.

[0059] In the upper and lower layer middle mold cavity stacking assembly 5, the upper middle mold cavity is clamped by the clamp e504 and stacked together with the material sheet with the welded middle point onto the lower middle mold cavity.

[0060] Next, the material conveyor belt of the production line continues to operate, pushing the workpiece to the high-frequency welding station on the outer ring of the middle airbag, that is, the station where the outer ring high-frequency welding component 6 is located. During the operation of the outer ring high-frequency welding component 6, the height of the driven plate f602 and the high-frequency welding head f603 is lowered by the telescopic rod f601. The high-frequency welding head f603 performs high-frequency welding according to the set parameters. After the welding is completed, it is pushed to the finished product unloading area, that is, the station where the finished product unloading component 7 is located. The finished product unloading component 7 is used to unload the finished product.

[0061] During the operation of the finished product discharge assembly 7, the driven block g702 slides on the guide rail g701 to adjust the horizontal position of the telescopic cylinder g703, and the clamp g704 clamps and discharges the finished product.

[0062] The above description is only a preferred embodiment of the present utility model and is not intended to further limit the present utility model. All equivalent changes made based on the description and drawings of the present utility model are within the protection scope of the present utility model.

Claims

1. An automatic welding device for massage bag airbags, characterized in that, The assembly includes a first hopper material feeding component (1), a middle mold cavity loading component (2), a second hopper material feeding component (3), a midpoint high-frequency welding component (4), upper and lower middle mold cavity stacking components (5), and an outer ring high-frequency welding component (6), which are arranged sequentially above the material conveyor belt of the production line. The first hopper material feeding assembly (1) is vertically equipped with a telescopic cylinder a (103), and a connecting frame a (104) is connected to the output shaft at the bottom of the telescopic cylinder a (103). A material feeding negative pressure suction cup a (105) for picking up materials is provided at the bottom of the connecting frame a (104). A telescopic cylinder b (108) is also vertically downward on one side of the telescopic cylinder a (103), and a clamp b (109) is connected to the telescopic end at the bottom of the telescopic cylinder b (108). The middle mold cavity mounting component (2) is vertically provided with a telescopic cylinder c (203), and a clamp c (204) for gripping materials is provided at the bottom end of the telescopic cylinder c (203). The second hopper material feeding assembly (3) is vertically provided with a telescopic cylinder d (303), and a connecting frame d (304) is provided on the output shaft at the bottom of the telescopic cylinder d (303). Several negative pressure suction cups d (305) for clamping and placing materials are fitted at the bottom of the connecting frame d (304). The intermediate point high-frequency welding assembly (4) has a telescopic rod a (401) vertically downward, a driven plate a (402) connected to the output end of the telescopic rod a (401), and a high-frequency welding head a (403) for welding the intermediate point of the material is located at the bottom end of the driven plate a (402). A telescopic cylinder e (503) is vertically arranged in the upper and lower layer cavity stacking assembly (5). A clamp e (504) is connected to the output shaft of the telescopic cylinder e (503). An extension plate (505) is also sleeved on the output shaft of the telescopic cylinder e (503). Several telescopic rods e (506) are vertically arranged through the outer edge of the extension plate (505). A pressure plate e (507) is arranged at the bottom end of the telescopic rods e (506). A telescopic rod f (601) is vertically downward in the outer ring high-frequency welding assembly (6). A driven plate f (602) is connected to the output shaft at the bottom end of the telescopic rod f (601). A high-frequency welding head f (603) for welding the outer ring of the material is also provided at the bottom end of the driven plate f (602).

2. The automatic welding device for massage bag airbags according to claim 1, characterized in that: The first hopper material feeding assembly (1) also includes a guide rail a (101) horizontally arranged above the material conveyor belt of the production line. The guide rail a (101) is arranged perpendicular to the material conveyor belt of the production line. A slidable driven block a (102) is fitted into the bottom end of the guide rail a (101). The top end of the telescopic cylinder a (103) is connected to the bottom end of the driven block a (102). A lead screw driven by a servo motor is also arranged parallel to the side of the guide rail a (101). The driven block a (102) is screwed onto the driven block a (102) and driven to move by the rotating lead screw. A guide rail b (106) is also provided on one side of the guide rail a (101). The guide rail b (106) is parallel to the material conveyor belt of the production line. A slidable driven block b (107) is fitted into the bottom end of the guide rail b (106). The top end of the telescopic cylinder b (108) is connected to the driven block b (107). The driven block b (107) can be driven to move by a lead screw, and the driving displacement mode of the driven block b (107) can be the same as the driving displacement mode of the driven block a (102).

3. The automatic welding device for massage bag airbags according to claim 2, characterized in that: The middle mold cavity mounting component (2) also includes a guide rail c (201) horizontally arranged above the material conveyor belt of the production line. The guide rail c (201) is arranged perpendicular to the material conveyor belt of the production line. A slidable driven block c (202) is fitted into the bottom end of the guide rail c (201). The top end of the telescopic cylinder c (203) is connected to the bottom end of the driven block c (202). The driven block c (202) can be driven to move by a lead screw, and the driving displacement mode of the driven block c (202) can be the same as the driving displacement mode of the driven block a (102).

4. The automatic welding device for massage bag airbags according to claim 3, characterized in that: The second hopper material feeding assembly (3) also includes a guide rail d (301) horizontally arranged above the material conveyor belt of the production line. The guide rail d (301) is arranged perpendicular to the material conveyor belt of the production line. A slidable driven block d (302) is fitted into the bottom end of the guide rail d (301). The top end of the telescopic cylinder d (303) is connected to the bottom end of the driven block d (302). The driven block d (302) can be driven to move by a lead screw, and the driving displacement mode of the driven block d (302) can be the same as the driving displacement mode of the driven block a (102).

5. The automatic welding device for massage bag airbags according to claim 4, characterized in that: The upper and lower layer cavity stacking assembly (5) includes a guide rail e (501) horizontally arranged above the material conveyor belt of the production line. The guide rail e (501) is parallel to the material conveyor belt of the production line. A slidable driven block e (502) is fitted into the bottom end of the guide rail e (501). The top end of the telescopic cylinder e (503) is connected to the bottom end of the driven block e (502). The driven block e (502) can be displaced by a lead screw, and the driving displacement mode of the driven block e (502) can be the same as the driving displacement mode of the driven block a (102).

6. The automatic welding device for massage bag airbags according to claim 5, characterized in that: The outer ring high-frequency welding assembly (6) is further provided with a finished product discharge assembly (7) at one end away from the upper and lower layer middle mold cavity stacking assembly (5). The finished product discharge assembly (7) includes a guide rail g (701) horizontally arranged above the material conveyor belt of the production line. The guide rail g (701) is arranged perpendicular to the material conveyor belt of the production line. The bottom end of the guide rail g (701) is fitted with a sliding follower block g (702), and the bottom end of the follower block g (702) is connected to a telescopic cylinder g (703). A clamp g (704) is provided on the output shaft below the telescopic cylinder g (703). An extension plate (505) is also provided at the bottom end of the output shaft of the telescopic cylinder g (703). A telescopic rod e (506) is also provided on the extension plate (505). A pressure plate e (507) is connected to the output shaft at the bottom end of the telescopic rod e (506).

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