Positioning welding device for truss construction

Abstract

The invention discloses a positioning and welding device for truss construction, relates to the technical field of welding, and solves the technical problems that a building truss is lack of effective positioning in the welding process, and the welding efficiency is influenced due to the need of overturning and welding. Comprising a welding table and a welding mechanism located in the direction of one side of the welding table, a fixing mechanism used for guiding and positioning an upper chord and a lower chord is installed on the welding table, a first clamping block used for clamping a first web member and a second clamping block used for clamping a second web member are rotationally installed on one side of the welding table, and a deflection mechanism is further installed on the welding table; the deflection mechanism is used for enabling the first clamping block and the second clamping block to synchronously and reversely deflect. By means of the welding device, the long truss can be positioned and welded section by section, the truss does not need to be overturned in the whole welding process, the welding quality and the welding efficiency can be improved, meanwhile, the web member and the two chord members can be always kept in the attached state in the welding process, and the welding firmness can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of welding, and in particular to a positioning welding device for truss construction. Background Art

[0002] Gymnasium buildings usually require long trusses, mainly because such buildings usually have large internal spaces and require long-span structures with no or few columns to meet the needs of sports activities, such as basketball, volleyball and other sports that require open and barrier-free competition venues. Long trusses can effectively span these large spaces while bearing the roof and other loads to ensure the safety and stability of the structure. In addition, the design of long trusses can also improve the efficiency of material use, reduce construction costs, and visually give people a more spacious and bright feeling, enhancing the audience's viewing experience.

[0003] In the prior art, for welding of long trusses, many components to be welded are usually placed on the ground, and then workers assist in welding. The lack of effective positioning during the welding process not only causes the components to move easily, but also the web and upper and lower chords cannot always maintain a tight fit during the welding process, thus affecting the welding quality. In addition, during the welding process of the truss, it is usually turned over after the front welding is completed to weld the back. For large trusses, this operation is not only time-consuming and labor-intensive, affecting welding efficiency, but also increases safety hazards. Summary of the invention

[0004] The purpose of the present invention is to provide a positioning welding device for truss construction, which solves the problem that the building truss lacks effective positioning during the welding process and the welding efficiency is affected due to the need for flipping welding.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A positioning welding device for truss construction comprises a welding table and a welding mechanism located on one side of the welding table, wherein a fixing mechanism for guiding and positioning an upper chord and a lower chord is installed on the welding table, a first clamping block for clamping a first web and a second clamping block for clamping a second web are rotatably installed on one side of the welding table, and a deflection mechanism is also installed on the welding table, wherein the deflection mechanism is used to synchronously deflect the first clamping block and the second clamping block in opposite directions so that the two ends of the first web and the second web are respectively in contact with the upper chord and the lower chord.

[0007] As a further solution of the present invention: the welding mechanism includes a moving seat, a telescopic column, a universal support arm, a welding gun and a welding pipe. The moving seat is used to move circumferentially along the ground where the welding table is placed. The telescopic column is connected to the top of the moving seat. The welding gun is connected to the top of the telescopic column through the universal support arm, and the welding pipe is connected to the end of the welding gun.

[0008] As a further solution of the present invention: the welding table includes a base with reserved holes, a hanging plate and a strip opening, the hanging plate is vertically installed on the top of the base and distributed along its length direction, the two strip openings are symmetrically distributed along the length direction of the hanging plate, the strip openings respectively correspond to the positions of the upper chord and the lower chord, and are opened through the hanging plate.

[0009] As a further solution of the present invention: the deflection mechanism includes an L-shaped plate, a guide sleeve, an upper tooth block, a lower tooth block, an upper gear, a lower gear and a pressure mechanism; the first clamping block is connected to the upper gear through a pin shaft, the second clamping block is connected to the lower gear through a pin shaft, the upper gear and the lower gear are respectively meshed with the upper tooth block and the lower tooth block, the upper tooth block and the lower tooth block are connected by an L-shaped plate, the guide sleeve and the pressure mechanism are both installed on the side of the hanging plate away from the first clamping block, the L-shaped plate is slidably plugged into the guide sleeve, and the pressure mechanism is used to apply thrust to the L-shaped plate.

[0010] As a further solution of the present invention: the fixing mechanism includes a supporting mechanism and a clamping mechanism, the supporting mechanism is used to support the upper chord and the lower chord, and the clamping mechanism is used to clamp the upper chord and the lower chord front and back.

[0011] As a further solution of the present invention: the supporting mechanism includes a fixed pallet, a movable pallet, a protrusion and a servo motor connected to a screw rod, the two fixed pallets are installed on one side of the welding table close to the end, and the two fixed pallets support the upper chord rod and the lower chord rod respectively, the two movable pallets are respectively located above the two fixed pallets, the servo motor is connected to the top of the welding table, the protrusion is connected to the side wall of the movable pallet, and the screw rod is threadedly connected to the protrusion.

[0012] As a further solution of the present invention: the clamping mechanism includes a U-shaped frame with a support rod, a front splint, a rear splint and a first cylinder, the two rear splints are installed at a position of the welding table away from the fixed support plate, the front splint is located in front of the rear splint, the U-shaped frame slides through the welding table, and the U-shaped frame is connected to the front splint through the support rod, the first cylinder is installed on the side of the welding table away from the support rod, and the piston rod of the first cylinder is connected to the U-shaped frame.

[0013] As a further solution of the present invention: the pressure mechanism includes a spring, a movable plate and a second cylinder, the second cylinder is installed at the side wall of the hanging plate, and the second cylinder is located below the L-shaped plate, the movable plate is connected to the piston rod of the second cylinder, the spring is installed on the side of the movable plate away from the second cylinder, and the other end of the spring is connected to the side wall of the vertical part of the L-shaped plate.

[0014] Beneficial effects of the present invention:

[0015] 1. In the present invention, the upper chord and the lower chord to be welded are conveniently installed on one side of the welding table by a fixing mechanism, and the first clamp block and the second clamp block are conveniently positioned to be welded, so that the components are not easily displaced during the welding process, which is beneficial to improving the welding effect. The welding mechanism is used to facilitate welding on both sides through the strip opening on the welding table, so that the truss does not need to be turned over, which is beneficial to improving the welding efficiency.

[0016] 2. In the present invention, the deflection force is conveniently applied to the first clamping block and the second clamping block through the deflection mechanism. Under the support of the deflection force, the first clamping block and the second clamping block can keep the two ends of the first web bar and the second web bar in a tight fit with the rod walls of the upper chord bar and the lower chord bar, respectively, which is beneficial to improve the welding quality and ensure the firmness of the welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a stereoscopic diagram of a positioning welding device for truss construction of the present invention from a first viewing angle;

[0019] Figure 2 It is a stereoscopic diagram of a positioning welding device for truss construction of the present invention from a second viewing angle;

[0020] Figure 3 It is a three-dimensional diagram of a welding mechanism in a positioning welding device for truss construction of the present invention;

[0021] Figure 4 It is a three-dimensional diagram of a welding table in a positioning welding device for truss construction of the present invention;

[0022] Figure 5 It is a three-dimensional diagram of a deflection mechanism in a positioning welding device for truss construction of the present invention;

[0023] Figure 6 It is a three-dimensional diagram of a supporting mechanism in a positioning welding device for truss construction of the present invention;

[0024] Figure 7 It is a three-dimensional diagram of a clamping mechanism in a positioning welding device for truss construction of the present invention;

[0025] Figure 8 The present invention is a stereoscopic diagram of the connection part between the pressure mechanism and the L-shaped plate in a positioning welding device for truss construction.

[0026] In the figure: 1, welding table; 11, reserved hole; 12, base; 13, hanging plate; 14, strip mouth; 2, welding mechanism; 21, moving seat; 22, telescopic column; 23, universal support arm; 24, welding gun; 25, welding pipe; 3, upper chord rod; 4, lower chord rod; 5, fixing mechanism; 51, supporting mechanism; 511, fixed support plate; 512, movable support plate; 513, bump; 514, screw rod; 515, servo motor; 52, clamping mechanism; 521 , support rod; 522, U-shaped frame; 523, front splint; 524, rear splint; 525, first cylinder; 6, first web; 7, first clamping block; 8, second web; 9, second clamping block; 10, deflection mechanism; 101, L-shaped plate; 102, guide sleeve; 103, upper gear block; 104, lower gear block; 105, upper gear; 106, lower gear; 107, pressure mechanism; 1071, spring; 1072, movable plate; 1073, second cylinder. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] like Figure 1-8 As shown, the present invention is a positioning welding device for truss construction, including a welding table 1 and a welding mechanism 2 located on one side of the welding table 1, a fixing mechanism 5 for guiding and positioning the upper chord 3 and the lower chord 4 is installed on the welding table 1, a first clamping block 7 for clamping the first web 6 and a second clamping block 9 for clamping the second web 8 are rotatably installed on one side of the welding table 1, and a deflection mechanism 10 is also installed on the welding table 1, and the deflection mechanism 10 is used to synchronously deflect the first clamping block 7 and the second clamping block 9 in the opposite direction, so that the two ends of the first web 6 and the second web 8 are respectively in conflict with the upper chord 3 and the lower chord 4.

[0029] It should be noted that, when in use, the upper chord rod 3 and the lower chord rod 4 are positioned respectively by the fixing mechanism 5, so that the upper chord rod 3 and the lower chord rod 4 are distributed in parallel on one side of the welding table 1, the first clamping blocks 7 and the second clamping blocks 9 are adjusted to deflect to a suitable angle, the first clamping blocks 7 and the second clamping blocks 9 are respectively used to clamp and position the first web rod 6 and the second web rod 8 to be welded, and the deflection mechanism 10 is used to apply a deflection force to the first clamping block 7 and the second clamping block 9. Under the support of the deflection force, the two ends of the first web rod 6 and the second web rod 8 can be kept in a tightly fitting state with the rod walls of the upper chord rod 3 and the lower chord rod 4, respectively, and the welding work can be carried out after the positioning is completed;

[0030] It should be noted that, in the present embodiment, the welding mechanism 2 is movable, and the positioned upper chord 3, lower chord 4, first web 6 and second web 8 can be fixedly welded together by the welding mechanism 2, thereby ensuring the welding quality and firmness of the truss.

[0031] like Figure 1 and Figure 3 As shown, the welding mechanism 2 includes a moving seat 21, a telescopic column 22, a universal support arm 23, a welding gun 24 and a welding pipe 25. The moving seat 21 is used to move circumferentially along the ground on which the welding table 1 is placed. The telescopic column 22 is connected to the top of the moving seat 21. The welding gun 24 is connected to the top of the telescopic column 22 through the universal support arm 23, and the welding pipe 25 is connected to the end of the welding gun 24.

[0032] It should be noted that, in the present embodiment, universal wheels with brake pads are provided at the four corners of the bottom of the movable seat 21 to facilitate the control of the free movement of the welding mechanism 2. An adjustable lifting knob is installed on the telescopic column 22. By controlling the length of the telescopic column 22, it is convenient to adapt to welding work at different heights. The universal support arm 23 is used to allow the welding gun 24 to be freely deflected at multiple angles during the welding process, thereby facilitating the adaptation to welding work at different angles.

[0033] like Figure 1 and Figure 4 As shown, the welding table 1 includes a base 12 with a reserved hole 11, a hanging plate 13 and a strip opening 14. The hanging plate 13 is vertically installed on the top of the base 12 and distributed along its length direction. The two strip openings 14 are symmetrically distributed along the length direction of the hanging plate 13. The strip openings 14 correspond to the positions of the upper chord rod 3 and the lower chord rod 4 respectively, and are opened through the hanging plate 13.

[0034] It should be noted that the reserved holes 11 are used to facilitate the fixing of the base 12 on the ground, thereby effectively ensuring the stability of the welding table 1. In this embodiment, the joints between the first web member 6 and the second web member 8 and the upper chord member 3 correspond to the position of the upper strip opening 14, and the joints between the first web member 6 and the second web member 8 and the lower chord member 4 correspond to the position of the lower strip opening 14. After the front side of the truss is welded, the back side can be welded through the strip opening 14. There is no need to flip the truss during the entire welding process, which is beneficial to improving the welding efficiency.

[0035] like Figure 1-2 and Figure 5As shown, the deflection mechanism 10 includes an L-shaped plate 101, a guide sleeve 102, an upper tooth block 103, a lower tooth block 104, an upper gear 105, a lower gear 106 and a pressure mechanism 107. The first clamping block 7 is connected to the upper gear 105 through a pin shaft, and the second clamping block 9 is connected to the lower gear 106 through a pin shaft. The upper gear 105 and the lower gear 106 are respectively meshed with the upper tooth block 103 and the lower tooth block 104. The upper tooth block 103 and the lower tooth block 104 are connected through the L-shaped plate 101. The guide sleeve 102 and the pressure mechanism 107 are both installed on the side of the hanging plate 13 away from the first clamping block 7. The L-shaped plate 101 is slidably plugged into the guide sleeve 102, and the pressure mechanism 107 is used to apply thrust to the L-shaped plate 101.

[0036] It should be noted that the pin on the first card block 7 is arranged near the back of the top end thereof, and the pin on the second card block 9 is arranged near the back of the bottom end thereof. The plurality of first card blocks 7 are arranged parallel to each other at the same angle, and the plurality of second card blocks 9 are also arranged parallel to each other at the same angle. The pressure mechanism 107 can be used to apply a thrust to one end of the L-shaped plate 101, such as Figure 2 As shown, the pressure mechanism 107 can apply a leftward thrust to the L-shaped plate 101, and the L-shaped plate 101 will have a leftward movement trend along the guide sleeve 102, and the upper gear block 103 will apply a clockwise deflection force to the upper gear 105, and the lower gear block 104 will apply a counterclockwise deflection force to the lower gear 106;

[0037] The upper gear 105 and the lower gear 106 drive the first clamping block 7 and the second clamping block 9 respectively. When the first clamping block 7 generates a clockwise deflection movement trend, it drives the two ends of the first web bar 6 to fit with the upper chord bar 3 and the lower chord bar 4 respectively; when the second clamping block 9 generates a counterclockwise deflection movement trend, it drives the two ends of the second web bar 8 to fit with the upper chord bar 3 and the lower chord bar 4 respectively.

[0038] like Figure 1 As shown, the fixing mechanism 5 includes a supporting mechanism 51 and a clamping mechanism 52 . The supporting mechanism 51 is used to support the upper chord rod 3 and the lower chord rod 4 , and the clamping mechanism 52 is used to clamp the upper chord rod 3 and the lower chord rod 4 front and back.

[0039] It should be noted that when the supporting mechanism 51 supports the upper chord 3 and the lower chord 4, it can prevent the upper chord 3 and the lower chord 4 from tilting up under the action of gravity. When the clamping mechanism 52 clamps the upper chord 3 and the lower chord 4 front and back, it can not only play a positioning role, but also push the upper chord 3 and the lower chord 4 to move forward while maintaining a non-clamped state, thereby facilitating subsequent welding. During the moving process, the clamping mechanism 52 contacts the front and rear sides of the upper chord 3 and the lower chord 4, so as not to cause obstruction to the first web member 6 and the second web member 8 that have been welded, so that a truss with a longer length can be welded section by section.

[0040] like Figure 2 and Figure 6 As shown, the supporting mechanism 51 includes a fixed support plate 511, a movable support plate 512, a protrusion 513 and a servo motor 515 connected to a screw rod 514. The two fixed support plates 511 are installed on one side of the welding table 1 close to the end, and the two fixed support plates 511 support the upper chord rod 3 and the lower chord rod 4 respectively. The two movable support plates 512 are respectively located above the two fixed support plates 511. The servo motor 515 is connected to the top of the welding table 1. The protrusion 513 is connected to the side wall of the movable support plate 512, and the screw rod 514 is threadedly connected to the protrusion 513.

[0041] It should be noted that the facing sides of the fixed support plate 511 and the movable support plate 512 are both arranged with an arc surface structure. The two fixed support plates 511 distributed up and down can be used to support the upper chord rod 3 and the lower chord rod 4 respectively. By starting the servo motor 515 to drive the screw rod 514 to rotate, the protrusion 513 can be controlled to drive the movable support plate 512 to approach the fixed support plate 511. When the two movable support plates 512 are respectively fitted with the upper chord rod 3 and the lower chord rod 4, they can form a support in cooperation with the fixed support plate 511, so that the upper chord rod 3 and the lower chord rod 4 will not tilt up under the action of gravity, so that the upper chord rod 3 and the lower chord rod 4 can always maintain a horizontal state parallel to each other.

[0042] like Figure 1 and Figure 7 As shown, the clamping mechanism 52 includes a U-shaped frame 522 with a support rod 521, a front clamp plate 523, a rear clamp plate 524 and a first cylinder 525. The two rear clamp plates 524 are installed at a position of the welding table 1 away from the fixed support plate 511, and the front clamp plate 523 is located in front of the rear clamp plate 524. The U-shaped frame 522 slides through the welding table 1, and the U-shaped frame 522 is connected to the front clamp plate 523 through the support rod 521. The first cylinder 525 is installed on a side of the welding table 1 away from the support rod 521, and the piston rod of the first cylinder 525 is connected to the U-shaped frame 522.

[0043] It should be noted that when the upper chord rod 3 and the lower chord rod 4 are kept in a horizontal state parallel to each other, the two rear clamping plates 524 will respectively fit with the rear rod walls of the upper chord rod 3 and the lower chord rod 4. When the first cylinder 525 is started to push the U-shaped frame 522 to slide along the welding table 1, the U-shaped frame 522 will drive the front clamping plate 523 to approach the rear clamping plate 524 through the support rod 521, so as to facilitate the positioning and clamping of the upper chord rod 3 and the lower chord rod 4 as needed. The clamped upper chord rod 3 and the lower chord rod 4 will not be displaced during the welding process, which is conducive to improving the stability of welding.

[0044] In order to improve the stability of clamping, in the present embodiment, the curved side walls of the front clamping plate 523 and the rear clamping plate 524 are provided with matching anti-slip pads. Since the upper chord 3 and the lower chord 4 are of relatively long overall length, in order to facilitate the welding of the truss in sections, after a part of the truss is welded, the first cylinder 525 is controlled to retract an appropriate amount of stroke to cancel the clamping state between the front clamping plate 523 and the rear clamping plate 524. Under the support and anti-warping effect of the support mechanism 51, the upper chord 3 and the lower chord 4 can be pushed to make them move. During the movement, the first web bar 6 and the second web bar 8 will not collide with the clamping mechanism 52, thereby facilitating the welding of the truss in sections with a longer length.

[0045] like Figure 5 and Figure 8 As shown, the pressure mechanism 107 includes a spring 1071, a movable plate 1072 and a second cylinder 1073. The second cylinder 1073 is installed on the side wall of the hanging plate 13, and the second cylinder 1073 is located below the L-shaped plate 101. The movable plate 1072 is connected to the piston rod of the second cylinder 1073. The spring 1071 is installed on the side of the movable plate 1072 away from the second cylinder 1073, and the other end of the spring 1071 is connected to the side wall of the vertical part of the L-shaped plate 101.

[0046] It should be noted that when the second cylinder 1073 is started to push the movable plate 1072 forward, the spring 1071 will be gradually compressed. The spring 1071 in the compressed and stored state will produce a thrust on the L-shaped plate 101. By controlling the travel amount of the movable plate 1072, the compression amount of the spring 1071 can be controlled, and then the thrust applied to the L-shaped plate 101 can be adjusted.

[0047] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A positioning welding device for truss construction, comprising a welding platform (1) and a welding mechanism (2) located on one side of the welding platform (1), characterized in that: The welding table (1) is provided with a fixing mechanism (5) for guiding and positioning the upper chord (3) and the lower chord (4); a first clamping block (7) for clamping the first web (6) and a second clamping block (9) for clamping the second web (8) are rotatably installed on one side of the welding table (1); a deflection mechanism (10) is also installed on the welding table (1); the deflection mechanism (10) is used to synchronously deflect the first clamping block (7) and the second clamping block (9) in opposite directions, so that the two ends of the first web (6) and the second web (8) are respectively in contact with the upper chord (3) and the lower chord (4).

2. A positioning welding device for truss construction according to claim 1, characterized in that: The welding mechanism (2) comprises a movable seat (21), a telescopic column (22), a universal support arm (23), a welding gun (24) and a welding pipe (25); the movable seat (21) is used to move circumferentially along the ground on which the welding table (1) is placed; the telescopic column (22) is connected to the top of the movable seat (21); the welding gun (24) is connected to the top of the telescopic column (22) via the universal support arm (23); and the welding pipe (25) is connected to the end of the welding gun (24).

3. A positioning welding device for truss construction according to claim 1, characterized in that: The welding table (1) comprises a base (12) with a reserved hole (11), a hanging plate (13) and a strip-shaped opening (14); the hanging plate (13) is vertically mounted on the top of the base (12) and distributed along its length direction; two strip-shaped openings (14) are symmetrically distributed along the length direction of the hanging plate (13); the strip-shaped openings (14) respectively correspond to the positions of the upper chord rod (3) and the lower chord rod (4) and are penetrated and opened on the hanging plate (13).

4. A positioning welding device for truss construction according to claim 3, characterized in that: The deflection mechanism (10) comprises an L-shaped plate (101), a guide sleeve (102), an upper tooth block (103), a lower tooth block (104), an upper gear (105), a lower gear (106) and a pressure mechanism (107); the first clamping block (7) is connected to the upper gear (105) via a pin shaft, the second clamping block (9) is connected to the lower gear (106) via a pin shaft, and the upper gear (105) and the lower gear (106) are respectively connected to the upper gear (105) and the lower gear (106). The upper tooth block (103) and the lower tooth block (104) are meshed, and the upper tooth block (103) and the lower tooth block (104) are connected via an L-shaped plate (101). The guide sleeve (102) and the pressure mechanism (107) are both installed on the side of the hanging plate (13) away from the first clamping block (7). The L-shaped plate (101) is slidably plugged into the guide sleeve (102), and the pressure mechanism (107) is used to apply a thrust to the L-shaped plate (101).

5. A positioning welding device for truss construction according to claim 1, characterized in that: The fixing mechanism (5) comprises a supporting mechanism (51) and a clamping mechanism (52); the supporting mechanism (51) is used to support the upper chord rod (3) and the lower chord rod (4); and the clamping mechanism (52) is used to clamp the upper chord rod (3) and the lower chord rod (4) front and back.

6. A tack welding device for truss construction according to claim 5, characterized in that: The support mechanism (51) comprises a fixed support plate (511), a movable support plate (512), a protrusion (513) and a servo motor (515) connected to a screw rod (514); the two fixed support plates (511) are installed on one side of the welding platform (1) close to the end, and the two fixed support plates (511) respectively support the upper chord rod (3) and the lower chord rod (4); the two movable support plates (512) are respectively located above the two fixed support plates (511); the servo motor (515) is connected to the top of the welding platform (1); the protrusion (513) is connected to the side wall of the movable support plate (512); and the screw rod (514) is threadedly connected to the protrusion (513).

7. A positioning welding device for truss construction according to claim 6, characterized in that: The clamping mechanism (52) comprises a U-shaped frame (522) with a support rod (521), a front clamping plate (523), a rear clamping plate (524) and a first cylinder (525); the two rear clamping plates (524) are installed at positions of the welding platform (1) away from the fixed support plate (511); the front clamping plate (523) is located in front of the rear clamping plate (524); the U-shaped frame (522) slides through the welding platform (1), and the U-shaped frame (522) is connected to the front clamping plate (523) via the support rod (521); the first cylinder (525) is installed on a side of the welding platform (1) away from the support rod (521), and the piston rod of the first cylinder (525) is connected to the U-shaped frame (522).

8. A truss construction positioning welding device according to claim 4, characterized in that: The pressure mechanism (107) includes a spring (1071), a movable plate (1072) and a second cylinder (1073), wherein the second cylinder (1073) is installed on the side wall of the hanging plate (13), and the second cylinder (1073) is located below the L-shaped plate (101), the movable plate (1072) is connected to the piston rod of the second cylinder (1073), the spring (1071) is installed on the side of the movable plate (1072) away from the second cylinder (1073), and the other end of the spring (1071) is connected to the side wall of the vertical part of the L-shaped plate (101).

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