Switch box welding tool

Abstract

The utility model belongs to the technical field of tool clamps, and discloses a switch box welding tool which comprises a workbench, a first stop base, a second stop base, a first pressing part and a second pressing part. A gap is formed between the first stop base and the first pressing part, the first stop base and the first pressing part are arranged in the length direction of the workbench, and the first pressing part is used for ejecting a switch box workpiece to one side of the first stop base; a gap is formed between the second stop base and the second pressing part, the second stop base and the second pressing part are arranged in the width direction of the workbench, and the second pressing part is used for pressing the switch box workpiece on the workbench. Transverse and longitudinal positioning of the switch box is achieved through the first stop base and the second stop base, the switch box workpiece is pressed on the first stop base through the first pressing component, the switch box workpiece is pressed on the workbench through the second pressing component, rapid fixing of the switch box workpiece is achieved, the installation mode is simple, the operation efficiency is high, and the switch box workpiece can be conveniently and rapidly fixed. And the consistency of products is guaranteed, and welding of operators is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to tool fixture technical field, especially relate to a switch box welding tool. BACKGROUND

[0002] With the rapid development of new energy industry, the sheet metal product manufacturing method is increasingly complex, and the switch box is a product with large demand and wide application, so it is of great significance to rapidly improve its production capacity.

[0003] The manufacturing process of the switch box has the characteristics of great welding difficulty and large welding quantity. Currently, the switch box welding needs to be manually operated. First, the edge of the lap joint is spot welded and fixed, and then all the welds are fully welded. Different welding operation methods cause unstable product welding, and there are multiple welding, missed welding and repair welding, which not only affects the welding efficiency of the product, but also affects the batch consistency of the product, and to some extent, reduces the customer experience. UTILITY MODEL CONTENTS

[0004] In view of the above problems, the utility model provides a switch box welding tool, which adopts the following technical scheme:

[0005] A switch box welding tool, comprising a workbench, a first stop base, a second stop base, a first pressing component and a second pressing component;

[0006] Wherein, the first stop base and the first pressing component have a spacing and are arranged along the length direction of the workbench, and the first pressing component is used to press the switch box workpiece on one side of the first stop base;

[0007] The second stop base and the second pressing component have a spacing and are arranged along the width direction of the workbench, and the second pressing component is used to press the switch box workpiece on the workbench.

[0008] Further, the first stop base and the first pressing component are arranged on both sides of the length direction of the switch box workpiece, and the second stop base and the second pressing component are arranged on both sides of the width direction of the switch box workpiece.

[0009] Further, the first stop base and the second stop base each comprise a U-shaped block, and the bottom of the U-shaped block is detachably connected with the workbench through a first connecting plate.

[0010] Further, the first connecting plate is provided with a first waist hole.

[0011] Further, the first pressing component comprises a first sliding rail, a first sliding block, a first lifting base and a first pressing handle.

[0012] The first slide rail is arranged along the length direction of the workbench, the first slide rail is detachably connected with the bottom workbench, the bottom of the first sliding block is in sliding connection with the first slide rail, the first lifting base is detachably connected with the top of the first sliding block, the first pressing handle is arranged on the top of the first lifting base, and the first pressing handle is used for pressing the switch box workpiece on one side of the first stop base.

[0013] Further, the length direction center line of the first slide rail is parallel to the center line of the length direction of the workbench.

[0014] Further, the second pressing component comprises a second slide rail, a second sliding block, a second lifting base and a second pressing handle.

[0015] The second slide rail is arranged along the width direction of the workbench, the bottom of the second slide rail is detachably connected with the workbench, the bottom of the second sliding block is in sliding connection with the second slide rail, the second lifting base is detachably connected with the top of the second sliding block, and the second pressing handle is arranged on the top of the second lifting base.

[0016] Further, the length direction center line of the second slide rail is parallel to the center line of the width direction of the workbench.

[0017] Further, the first pressing handle comprises a first base, a sliding seat, a sliding rod, a first connecting rod and a first handle.

[0018] The first base is detachably connected with the top of the first lifting base, the sliding seat is arranged on the side of the first base close to the first stop base, the sliding rod slides in the sliding seat along the length direction of the workbench, the first handle is fixedly connected with the top of the first connecting rod, the bottom of the first connecting rod is hinged to the side of the first base away from the first stop base, one end of the sliding rod away from the first stop base is hinged to the middle part of the first connecting rod, and one end of the sliding rod close to the first stop base is provided with a pressing head.

[0019] Further, the second pressing handle comprises a second base, a pressing rod, a second connecting rod and a second handle.

[0020] The second base is detachably connected with the top of the second lifting base, one end of the pressing rod close to the second stop base is provided with a bolt assembly, the bottom of the bolt assembly is provided with a pressing head, the bottom of the other end of the pressing rod away from the second stop base is hingedly connected with the second base, the top of the other end of the pressing rod away from the second stop base is hingedly connected with one end of the second handle, the middle of the second handle is hingedly connected with one end of the second connecting rod, and the other end of the second connecting rod is hingedly connected with the second base.

[0021] The welding tool has the advantages that:

[0022] 1. The first stop base and the second stop base in the welding tool abut against two side plates adjacent to the switch box workpiece, so that the switch box is positioned in the horizontal direction and the vertical direction, the switch box workpiece is pressed on the first stop base by the first pressing component, the switch box workpiece is pressed on the workbench by the second pressing component, the switch box workpiece is quickly fixed, the installation mode is simple, the operability is good during use, the operation efficiency is high, the operator can easily weld the weld of the switch box workpiece, the welding is performed after the switch box workpiece is positioned by the welding tool, the consistency of the product is ensured, the operator can easily weld, the welding efficiency is improved, and the satisfaction of customers for the product is improved.

[0023] 2. The first pressing component and the second pressing component in the welding tool are slidably connected with the workbench, the first lifting base and the second lifting base can adapt to workpiece machining of different heights, the welding and positioning requirements of switch box workpieces of various sizes can be met, the machining precision of the switch box workpiece is improved, the work efficiency is improved, and the switch box machining difficulty is reduced.

[0024] Other features and advantages of the present application will be described in the following description, and some will become apparent from the description, or will be understood from the practice of the present application. The purpose and other advantages of the present application can be achieved and obtained by the structure indicated in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0026] Figure 1 A structure schematic view of a switch box welding tool according to an embodiment of the present application is shown;

[0027] Figure 2 A structure schematic view of the first compression part is shown according to the embodiment of the utility model;

[0028] Figure 3 A structure schematic view of the second compression part is shown according to the embodiment of the utility model.

[0029] In the figure: 1, workbench;2, first stop base;3, second stop base;4, first compression part;5, second compression part;6, switch box workpiece;7, U-shaped block;8, first connecting plate;9, first waist-shaped hole;10, first sliding rail;11, first sliding block;12, first lifting base;13, first compression handle;14, first vertical plate;15, first sliding plate;16, first bottom plate;17, third through hole;18, second connecting plate;19, second waist-shaped hole;20, first base;21, sliding seat;22, sliding rod;23, first connecting rod;24, first handle;25, second sliding rail;26, second sliding block;27, second lifting base;28, second compression handle;29, second vertical plate;30, second sliding plate;31, second bottom plate;32, fifth through hole;33, third connecting plate;34, third waist-shaped hole;35, second base;36, compression rod;37, second connecting rod;38, second handle;39, bolt assembly. DETAILED DESCRIPTION

[0030] To make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely explained below in combination with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without making creative efforts fall within the protection scope of the utility model.

[0031] It should be noted that the terms "first", "second" and the like in the present application are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein. In the present application, the terms "up", "down", "left", "right", "front", "back", "top", "bottom", "in", "out", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate the orientation or positional relationship shown in the drawings.

[0032] The utility model embodiment proposes a switch box welding tool, adopts unique clamping mode, guarantees the stability and consistency of switch box product welding, greatly promotes the welding efficiency of the product, and this tool can consider welding different switch box products.

[0033] As shown in Figure 1 A switch box welding tool, comprising a workbench 1, a first stop base 2, a second stop base 3, a first pressing component 4 and a second pressing component 5.

[0034] The first stop base 2 and the first pressing component 4 are spaced apart and arranged along the length direction of the workbench 1, and the first pressing component 4 is used to press the switch box workpiece 6 against one side of the first stop base 2. For example, the first stop base 2 and the first pressing component 4 are arranged on opposite sides of the length direction of the switch box workpiece 6. For example, the first stop base 2 is arranged at the middle of the left side of the workbench 1, and the first pressing component 4 is arranged at the middle of the right side of the workbench 1.

[0035] The second stop base 3 and the second pressing component 5 are spaced apart and arranged along the width direction of the workbench 1, and the second pressing component 5 is used to press the switch box workpiece 6 against the workbench 1. For example, the second stop base 3 and the second pressing component 5 are arranged on opposite sides of the width direction of the switch box workpiece 6. For example, the second stop base 3 is arranged at the middle of the front side of the workbench 1, and the second pressing component 5 is arranged at the middle of the rear side of the workbench 1.

[0036] When the welding tool of the embodiment clamps the switch box, the switch box workpiece 6 is placed on the workbench 1, the first stop base 2 and the second stop base 3 abut the two side plates adjacent to the switch box workpiece 6 respectively, realizing the positioning of the switch box in the transverse and longitudinal directions, the switch box workpiece 6 is pressed on the first stop base 2 by the first pressing component 4, and the switch box workpiece 6 is pressed on the workbench 1 by the second pressing component 5, realizing the fixation of the switch box workpiece 6, facilitating the positioning and welding. The welding tool of the embodiment has simple installation mode, good operability in use process, and high work efficiency, and can quickly clamp and fix the switch box workpiece 6, facilitating the operator to weld the weld of the switch box workpiece 6.

[0037] After the welding of the switch box workpiece 6 is completed, the first pressing component 4 and the second pressing component 5 are loosened, and the switch box workpiece 6 is taken out. The welding tool of the embodiment has simple installation mode, good operability in use process, and high work efficiency.

[0038] As shown in Figure 1 For example, the first stop base 2 and the second stop base 3 each comprise a U-shaped block 7, and the two sides of the bottom of the U-shaped block 7 are each provided with a first connecting plate 8, which is detachably connected with the workbench 1.

[0039] For example, the first connecting plate 8 is provided with a first waist-shaped hole 9, and the workbench 1 is provided with two first through holes at the first stop base 2 and the second stop base 3. The bolt passes through the first waist-shaped hole 9 on the first connecting plate 8 and the first through hole and is connected with the nut to fix the first stop base 2 and the second stop base 3 on the workbench 1, respectively.

[0040] By arranging the first waist-shaped hole 9 on the first connecting plate 8, the positions of the first stop base 2 and the second stop base 3 relative to the workbench 1 are adjustable, and the switch box workpiece 6 of different sizes can be applied.

[0041] As shown in Figure 1 , for example, the first pressing component 4 includes a first sliding rail 10, a first sliding block 11, a first lifting base 12, and a first pressing handle 13.

[0042] The first sliding rail 10 is arranged in two, and the two first sliding rails 10 are arranged along the length direction of the workbench 1, for example, the length direction center lines of the two first sliding rails 10 are parallel to the center line of the length direction of the workbench 1, the bottoms of the two first sliding rails 10 are detachably connected with the workbench 1 through the bolt, the bottom of the first sliding block 11 is slidingly connected with the two first sliding rails 10, the first lifting base 12 is detachably connected with the top of the first sliding block 11 through the bolt, the first pressing handle 13 is arranged on the top of the first lifting base 12, and the first pressing handle 13 is used to press the switch box workpiece 6 on one side of the first stop base 2.

[0043] In the embodiment, the first sliding block 11 is slidingly connected with the first sliding rail 10, so that the interval between the first lifting base 12 and the first stop base 2 is adjustable, and the switch box workpiece 6 of different lengths can be used, the first pressing handle 13 is arranged on the first lifting base 12, the height of the first lifting base 12 is adjustable, so that the first pressing handle 13 can press the switch box workpiece 6 of different heights.

[0044] As shown in Figure 2 , for example, the first lifting base 12 includes a first vertical plate 14, a first sliding plate 15, and a first bottom plate 16.

[0045] The first sliding plate 15 is arranged in two, the top of the two first sliding plates 15 is fixedly connected with the bottom of the first bottom plate 16, the first pressing handle 13 is fixedly arranged on the top of the first bottom plate 16, the outer side of each first sliding plate 15 is in contact with the inner side of one first vertical plate 14, the position close to the bottom of the first sliding plate 15 is provided with a second through hole, and the first vertical plate 14 is provided with a plurality of third through holes 17 along the height direction, and the plurality of third through holes 17 are distributed at equal intervals.

[0046] The bolt passes through the third through hole 17 of different height, the second through hole and the nut to connect, fix the first sliding plate 15 and the first bottom plate 16 at different height, so that the height adjustment of the first pressing handle 13 can be realized, and the switch box workpiece 6 pressing can be applied to different height.

[0047] As shown in Figure 2 For example, the bottom of each first vertical plate 14 is provided with a second connecting plate 18, the second connecting plate 18 is provided with a second waist-shaped hole 19, the first sliding block 11 is provided with a first threaded blind hole at both first vertical plates 14, the bolt passes through the second waist-shaped hole 19 on the second connecting plate 18 and connects with the first threaded blind hole to fix the first vertical plate 14 on the first sliding block 11, the second waist-shaped hole 19 is arranged on the second connecting plate 18 to adjust the position of the first lifting base 12 relative to the first sliding block 11, and the use range of the welding tooling is further widened.

[0048] For example, the first lifting base 12 can also realize the lifting function by replacing the structure of lifting rod, and details are not repeated.

[0049] As shown in Figure 2 For example, the first pressing handle 13 includes a first base 20, a sliding seat 21, a sliding rod 22, a first connecting rod 23 and a first handle 24, wherein the first base 20 is detachably connected with the top of the first lifting base 12 through the bolt, the sliding seat 21 is arranged on the side of the first base 20 close to the first stop base 2, the sliding rod 22 slides in the sliding seat 21 along the length direction of the workbench 1, the first handle 24 is fixedly connected with the top of the first connecting rod 23, the bottom of the first connecting rod 23 is hinged to the side of the first base 20 away from the first stop base 2, the end of the sliding rod 22 away from the first stop base 2 is hinged to the middle of the first connecting rod 23, and the end of the sliding rod 22 close to the first stop base 2 is provided with a pressing head made of plastic material.

[0050] By rotating the first handle 24, the first connecting rod 23 drives the sliding rod 22 to slide in the sliding seat 21 along the length direction of the workbench 1, and the sliding rod 22 drives the pressing head to press and release the switch box workpiece 6.

[0051] As shown in Figure 1 For example, the second pressing component 5 includes a second sliding rail 25, a second sliding block 26, a second lifting base 27 and a second pressing handle 28.

[0052] The second slide rail 25 is provided with two, the two second slide rails 25 are arranged along the width direction of the workbench 1, for example, the length direction center line of the two second slide rails 25 is parallel to the center line of the width direction of the workbench 1, the bottom of the two second slide rails 25 is detachably connected with the workbench 1 through bolts, the bottom of the second sliding block 26 is slidingly connected with the two second slide rails 25, the second lifting base 27 is detachably connected with the top of the second sliding block 26 through bolts, the second pressing handle 28 is arranged on the top of the second lifting base 27, and the second pressing handle 28 is used for pressing the switch box workpiece 6 on the workbench 1.

[0053] In the embodiment, the second sliding block 26 is slidingly connected with the second slide rail 25, so that the interval between the second lifting base 27 and the second stop base 3 is adjustable, and the second lifting base 27 can be used for switch box workpieces 6 of different widths. The second pressing handle 28 is arranged on the second lifting base 27, and the height of the second lifting base 27 is adjustable, so that the second pressing handle 28 can press switch box workpieces 6 of different heights.

[0054] As shown in Figure 3 For example, the second lifting base 27 includes a second vertical plate 29, a second sliding plate 30 and a second bottom plate 31, wherein the second vertical plate 29 is provided with two, and the two second vertical plates 29 are arranged on the top of the second sliding block 26 and are parallel to each other.

[0055] The second sliding plate 30 is provided with two, the top of the two second sliding plates 30 is fixedly connected with the bottom of the second bottom plate 31, the second pressing handle 28 is fixedly arranged on the top of the second bottom plate 31, the outer side of each second sliding plate 30 is in contact with the inner side of one second vertical plate 29, the position close to the bottom of the second sliding plate 30 is provided with a fourth through hole, and a plurality of fifth through holes 32 are arranged on the second vertical plate 29 along the height direction, and the plurality of fifth through holes 32 are distributed at equal intervals.

[0056] The bolt is connected with the nut through the fifth through hole 32 and the fourth through hole of different heights, and the second sliding plate 30 and the second bottom plate 31 are fixed at different heights, so as to realize the height adjustment of the second pressing handle 28, and the second pressing handle 28 can be suitable for pressing switch box workpieces 6 of different heights.

[0057] As shown in Figure 3 For example, the bottom of each second vertical plate 29 is provided with a third connecting plate 33, the third connecting plate 33 is provided with a third waist-shaped hole 34, the second sliding block 26 is provided with a second threaded blind hole at the two second vertical plates 29, and the bolt is connected with the second threaded blind hole through the third waist-shaped hole 34 on the third connecting plate 33, so as to fix the second vertical plate 29 on the second sliding block 26. By arranging the third waist-shaped hole 34 on the third connecting plate 33, the position of the second lifting base 27 relative to the second sliding block 26 is adjustable, and the use range of the welding tooling is further widened.

[0058] For example, the second lifting base 27 can also realize the lifting function by a lifting rod or the like structure instead of the lifting mechanism, and details are not repeated.

[0059] For example, the second pressing handle 28 comprises a second base 35, a pressing rod 36, a second connecting rod 37 and a second handle 38, wherein the second base 35 is detachably connected with the top of the second lifting base 27 by bolts, the pressing rod 36 is provided with a bolt assembly 39 at one end close to the second stop base 3, the bottom of the bolt assembly 39 is provided with a pressing head (not shown in the figure), and the height of the pressing head can be adjusted by the bolt assembly 39.

[0060] The bottom of the other end of the pressing rod 36 away from the second stop base 3 is hinged with the second base 35, the top of the other end of the pressing rod 36 away from the second stop base 3 is hinged with one end of the second handle 38, the middle of the second handle 38 is hinged with one end of the second connecting rod 37, and the other end of the second connecting rod 37 is hinged with the second base 35.

[0061] By rotating the second handle 38, the pressing rod 36 drives the bolt assembly 39 to move along the height direction to press and release the switch box workpiece 6.

[0062] The welding tooling of the embodiment is designed by overall material processing, has reliable structure, good processability, high machining precision, high structural strength and high positioning precision; during the fixing of the switch box workpiece 6, the first pressing component 4 and the second pressing component 5 are slidably connected with the workbench 1, the first lifting base 12 and the second lifting base 27 are adjusted to adapt to workpieces of different heights for processing, the welding and positioning requirements of switch box workpieces 6 of various sizes can be realized, the machining precision of the switch box workpiece 6 is improved, the work efficiency is improved, the difficulty of switch box processing is reduced, the model change is facilitated, and the versatility is high.

[0063] Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can still be modified, or some technical features can be replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A switch box welding fixture, characterized by, The utility model relates to a switch box pressing device, including workbench (1), first stop base (2), second stop base (3), first pressure part (4) and second pressure part (5); Wherein, first stop base (2) and first pressure part (4) have interval and set along the length direction of workbench (1), and first pressure part (4) is used to press the switch box workpiece (6) on the side of first stop base (2); Second stop base (3) and second pressure part (5) have interval and set along the width direction of workbench (1), and second pressure part (5) is used to press the switch box workpiece (6) on workbench (1).

2. The switch box welding fixture of claim 1, wherein, First stop base (2) and first pressure part (4) are configured to be oppositely arranged on both sides of the length direction of switch box workpiece (6), and second stop base (3) and second pressure part (5) are configured to be oppositely arranged on both sides of the width direction of switch box workpiece (6).

3. The switch box welding fixture of claim 1, wherein, First stop base (2) and second stop base (3) both include U-shaped block (7), and the bottom of U-shaped block (7) is detachably connected with workbench (1) through first connecting plate (8).

4. The switch box welding fixture of claim 3, wherein, First connecting plate (8) is provided with first waist type hole (9).

5. The switch box welding fixture of any one of claims 1-4, wherein, First pressure part (4) includes first sliding rail (10), first sliding block (11), first lifting base (12) and first pressure handle (13); The first slide rail (10) is arranged along the length direction of the workbench (1), and is detachably connected with the bottom workbench (1). The bottom of the first sliding block (11) is in sliding connection with the first slide rail (10). The first lifting base (12) is detachably connected with the top of the first sliding block (11). The first pressing handle (13) is arranged on the top of the first lifting base (12) ， The first pressing handle (13) is used for pressing the switch box workpiece (6) on one side of the first stop base (2).

6. The switch box welding fixture of claim 5, wherein, The length direction center line of first sliding rail (10) is parallel with the length direction center line of workbench (1).

7. The switch box welding fixture of any one of claims 1-4, wherein, Second pressure part (5) includes second sliding rail (25), second sliding block (26), second lifting base (27) and second pressure handle (28); Wherein, second sliding rail (25) is arranged along the width direction of workbench (1), the bottom of second sliding rail (25) is detachably connected with workbench (1), the bottom of second sliding block (26) is slidingly connected with second sliding rail (25), second lifting base (27) is detachably connected with the top of second sliding block (26), second pressure handle (28) is arranged on the top of second lifting base (27), and second pressure handle (28) is used to press the switch box workpiece (6) on workbench (1).

8. The switch box welding fixture of claim 7, wherein, The length direction center line of second sliding rail (25) is parallel with the width direction center line of workbench (1).

9. The switch box welding fixture of claim 5, wherein, First pressure handle (13) includes first base (20), sliding seat (21), sliding rod (22), first connecting rod (23) and first handle (24); The first base (20) is detachably connected with the top of the first lifting base (12), the sliding seat (21) is arranged on the side of the first base (20) close to the first stop base (2), the sliding rod (22) slides in the sliding seat (21) along the length direction of the workbench (1), the first handle (24) is fixedly connected with the top of the first connecting rod (23), the bottom of the first connecting rod (23) is hingedly connected with the side of the first base (20) away from the first stop base (2), one end of the sliding rod (22) away from the first stop base (2) is hingedly connected with the middle of the first connecting rod (23), and the end of the sliding rod (22) close to the first stop base (2) is provided with a pressing head.

10. The switch box welding fixture of claim 7, wherein, The second pressing handle (28) comprises a second base (35), a pressing rod (36), a second connecting rod (37) and a second handle (38); The second base (35) is detachably connected with the top of the second lifting base (27), one end of the pressing rod (36) close to the second stop base (3) is provided with a bolt assembly (39), the bottom of the bolt assembly (39) is provided with a pressing head, the bottom of one end of the pressing rod (36) away from the second stop base (3) is hingedly connected with the second base (35), the top of one end of the pressing rod (36) away from the second stop base (3) is hingedly connected with one end of the second handle (38), the middle of the second handle (38) is hingedly connected with one end of the second connecting rod (37), and the other end of the second connecting rod (37) is hingedly connected with the second base (35). The second base (35) is detachably connected with the top of the second lifting base (27), one end of the pressing rod (36) close to the second stop base (3) is provided with a bolt assembly (39), the bottom of the bolt assembly (39) is provided with a pressing head, the bottom of one end of the pressing rod (36) away from the second stop base (3) is hingedly connected with the second base (35), the top of one end of the pressing rod (36) away from the second stop base (3) is hingedly connected with one end of the second handle (38), the middle of the second handle (38) is hingedly connected with one end of the second connecting rod (37), and the other end of the second connecting rod (37) is hingedly connected with the second base (35).

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