Reshaping device for lower box body of automobile battery

Abstract

The utility model discloses an automobile battery lower box shaping device which comprises a support, a working table, a positioning supporting device, a shaping mechanism and a vibration device, the working table is arranged on the support and used for bearing workpieces, the positioning supporting device comprises at least two positioning clamping assemblies, the positioning clamping assemblies are arranged on the working table and the support, and the shaping mechanism is arranged on the working table. The positioning and clamping assemblies can clamp and lock a workpiece to the workbench, the shaping mechanism comprises at least one anti-deformation bending and pressing mechanism, the anti-deformation bending and pressing mechanism is arranged between the two positioning and clamping assemblies and can press the workpiece to enable the workpiece to form a deformation part, the vibration device is arranged on the support and can be matched with the workpiece, and the vibration device is arranged on the support. And the deformation part is vibrated. The reversible deformation bending and pressing mechanism bends the part, needing to be shaped, of the workpiece to form the deformation part, the vibration device can apply vibration to the deformation part, deformation stress in the deformation part of the workpiece can be quickly released, the shaping time is shortened, and the shaping efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of new energy vehicles, and in particular to a shaping device for the lower casing of an automobile battery. Background Technology

[0002] In recent years, with the development of new energy electric vehicles, the requirements for internal space ratio and high power capacity have led to the gradual shift of aluminum alloy lower box structure to a module-free design, that is, the optimization from CTM structure to CTP structure. This structural design eliminates the internal longitudinal beams of the product, and some boxes even eliminate the internal transverse beams, forming a structure of side beams and bottom plate. Due to the elimination of the transverse and longitudinal beams, after the lower box is integrated through welding and other processes, the internal rigidity is insufficient, which will eventually create a height difference between the middle and the sides. The above deformation will affect the normal assembly of the battery. In the existing technology, shaping fixtures are used for shaping. Usually, shaping fixtures achieve shaping by pressing and deforming in one direction. If the pressing amount is too large at one time, it may cause the product to deform and crack. If the pressing amount is too small, multiple pressing is required, resulting in low production efficiency. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a shaping device for the lower casing of an automotive battery, which can improve shaping efficiency.

[0004] A shaping device for the lower casing of an automobile battery according to a first aspect of the present invention includes: a bracket, a worktable, a positioning support device, a shaping mechanism, and a vibration device. The worktable is disposed on the bracket and is used to support a workpiece. The positioning support device includes at least two positioning clamping assemblies, which are disposed on the worktable and / or the bracket. The positioning clamping assemblies can clamp and lock the workpiece on the worktable. The shaping mechanism includes at least one anti-deformation bending and pressing mechanism, which can press against the workpiece to form a deformed portion. The vibration device is disposed on the bracket and can cooperate with the workpiece to vibrate the deformed portion.

[0005] According to an embodiment of the present invention, a shaping device for the lower body of an automobile battery has at least the following beneficial effects: after the workpiece is positioned by the positioning support device, the positioning clamping assembly can fix the workpiece on the worktable, and the anti-deformation bending and pressing mechanism of the shaping mechanism can bend the part of the workpiece that needs to be shaped to form a deformed part. At the same time, the vibration device can apply vibration to the deformed part, which can quickly release the deformation stress in the deformed part of the workpiece, making it less prone to cracking and springback, thereby eliminating the need for repeated pressing and shaping, reducing shaping time and improving shaping efficiency.

[0006] According to some embodiments of the present invention, the anti-deformation bending and pressing mechanism includes a first driving member and a first pressing block. The first driving member is disposed on the bracket, and the first pressing block is connected to the first driving member in a transmission manner. The first driving member can drive the first pressing block to move toward the workpiece.

[0007] According to some embodiments of the present invention, the positioning and clamping assembly includes a second driving member, a second pressing block, and a first supporting member. The second driving member is disposed on the bracket, the second pressing block is connected to the second driving member in a transmission manner, and the first supporting member is disposed on the worktable. The second driving member can drive the second pressing block to move toward the first supporting member so as to press the workpiece against the first supporting member.

[0008] According to some embodiments of this utility model, the height of the second pressing block when it abuts against the workpiece is A, the height of the first pressing block when it abuts against the workpiece is B, the relative height difference of the workpiece is Z1 = BA, and after the first pressing block abuts against the workpiece, the downward pressing stroke of the first driving member driving the first pressing block is Z2 = 2 * Z1 + 2.

[0009] According to some embodiments of the present invention, the vibration device includes a driving component and two vibration blocks. The driving component is disposed on the bracket, and the vibration blocks are connected to the driving component in a transmission manner. The driving component can drive the vibration blocks to move up and down, and the vibration blocks are respectively located on both sides of the first pressing block. When the first pressing block is pressed down by Z2 strokes, the driving component can drive the vibration blocks to vibrate the deformed part.

[0010] According to some embodiments of the present invention, the first support member includes a base and a support block. The base is disposed on the workbench, and the support block is rotatably disposed on the base. The support block is made of an elastic material.

[0011] According to some embodiments of the present invention, the anti-deformation bending and pressing mechanism further includes a second support member, which is disposed on the workbench and located below the first pressing block, and the support height of the second support member can be adjusted.

[0012] According to some embodiments of the present invention, it further includes a conveying track and a first driving device disposed on the support. The support has an opening on its front side. The conveying track extends in the front-back direction and extends out of the opening. The worktable is slidably disposed on the conveying track. The first driving device is connected to the worktable in a transmission manner to drive the worktable to slide along the extension direction of the conveying track.

[0013] According to some embodiments of the present invention, the workbench is provided with a first adjustment track and a second adjustment track. The first adjustment track extends in the front-back direction, and the second adjustment track is slidably connected to the first adjustment track and can slide to adjust its position in the front-back direction. The second adjustment track extends in the left-right direction, and the first support member and the second support member are slidably disposed on the second adjustment track so that the first support member and the second support member can slide to adjust their position in the left-right direction.

[0014] According to some embodiments of the present invention, the bracket is provided with multiple adjustment components, each adjustment component including a third adjustment rail and a fourth adjustment rail. The third adjustment rail extends in the left-right direction, and the fourth adjustment rail extends in the front-back direction and is slidably connected to the third adjustment rail. The first driving member or the second driving member is slidably connected to the fourth adjustment rail.

[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0016] The above or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0017] Figure 1 This is a general schematic diagram of some embodiments of the present utility model;

[0018] Figure 2 for Figure 1 The front view;

[0019] Figure 3 This is a schematic diagram showing the workbench after it has been sent out.

[0020] Figure 4 for Figure 1 A magnified view of a section at point A in the middle;

[0021] Figure 5 for Figure 1 A magnified view of a section at point B in the middle;

[0022] Figure 6 for Figure 3 A magnified view of a section at point C;

[0023] Figure 7 for Figure 3 A magnified view of a section at point D.

[0024] Figure label:

[0025] Support 100, opening 110, conveying rail 120, first drive device 130, adjustment component 140, third adjustment rail 141, fourth adjustment rail 142;

[0026] Worktable 200, first adjusting rail 210, second adjusting rail 220;

[0027] Positioning and clamping assembly 310, second driving component 311, second pressing block 312, first support component 313, base 3131, support block 3132;

[0028] Anti-deformation bending and pressing mechanism 410, first driving component 411, first pressing block 412, second support component 413;

[0029] Vibration device 500, vibration block 510;

[0030] Workpiece 600, deformed part 610. Detailed Implementation

[0031] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0032] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0033] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0034] Reference Figures 1 to 3 According to a first aspect of the present invention, a shaping device for the lower casing of an automobile battery includes a bracket 100, a worktable 200, a positioning support device, a shaping mechanism, and a vibration device 500. The worktable 200 is disposed on the bracket 100 and is used to support a workpiece 600. The positioning support device includes at least two positioning clamping components 310, which are disposed on the worktable 200 and / or the bracket 100. The positioning clamping components 310 can clamp and lock the workpiece 600 on the worktable 200. The shaping mechanism includes at least one anti-deformation bending and pressing mechanism 410, which is disposed between the two positioning clamping components 310. The anti-deformation bending and pressing mechanism 410 can press against the workpiece 600 to form a deformed part 610 on the workpiece 600. The vibration device 500 is disposed on the bracket 100 and can cooperate with the workpiece 600 to vibrate the deformed part 610. After the workpiece 600 is positioned by the positioning support device, the positioning clamping assembly 310 can fix the workpiece 600 on the worktable 200. The anti-deformation bending and pressing mechanism 410 of the forming mechanism presses and bends the part of the workpiece 600 that needs to be formed to form the deformed part 610. At the same time, the vibration device 500 can apply vibration to the deformed part 610, which can quickly release the deformation stress in the deformed part 610 of the workpiece 600, making it less prone to cracking and springback. Therefore, it is not necessary to repeatedly press down to form, thereby reducing the forming time and improving the forming efficiency.

[0035] Specifically, the support frame 100 is the equipment frame, and the worktable 200 is mounted on the support frame 100. The worktable 200 is used to support the workpiece 600, which is the lower battery casing. The positioning support device can position and support the workpiece 600. The positioning clamping assembly 310 can be set to four, which are respectively positioned, clamped, and locked to the four corners of the workpiece 600. The forming mechanism can be equipped with two anti-deformation bending and pressing mechanisms 410. Since the workpiece 600 is generally rectangular in shape, matching the shape of a car, the side beams of the workpiece 600 in the length direction are prone to arching. Therefore... The two long side beams are supported at both ends by positioning and clamping components 310, while the middle is shaped and bent by two anti-deformation bending mechanisms 410 to adjust the shape of the workpiece 600 to the normal range so that the battery can be assembled normally. When the anti-deformation bending mechanism 410 presses against the workpiece 600, the workpiece 600 will gradually form a deformed part 610. At the same time, the vibration device 500 can apply vibration to the deformed part 610 to release the deformation stress of the workpiece 600 during bending deformation, so that it is not easy to crack, and the bending amount can be increased to improve the shaping efficiency.

[0036] In some embodiments of this utility model, the anti-deformation bending mechanism 410 includes a first driving member 411 and a first pressing block 412. The first driving member 411 is disposed on the bracket 100, and the first pressing block 412 is pulsatorically connected to the first driving member 411. The first driving member 411 can drive the first pressing block 412 to move toward the workpiece 600. Specifically, the first driving member 411 can be a hydraulic cylinder. The upper part of the bracket 100 is a gantry structure, and the hydraulic cylinder is installed on the upper part of the bracket 100. The first pressing block 412 can be connected to the output rod of the hydraulic cylinder. The hydraulic cylinder drives the first pressing block 412 to move downward and cooperate with the workpiece 600. The hydraulic cylinder can provide sufficient pressure.

[0037] In some embodiments of this utility model, the positioning and clamping assembly 310 includes a second driving member 311, a second pressing block 312, and a first support member 313. The second driving member 311 is disposed on the bracket 100, the second pressing block 312 is connected to the second driving member 311 in a transmission manner, and the first support member 313 is disposed on the worktable 200. The second driving member 311 can drive the second pressing block 312 to move toward the first support member 313 to press the workpiece 600 against the first support member 313. Specifically, the second driving member 311 can be a hydraulic cylinder and installed on the upper part of the bracket 100. The worktable 200 is located below the upper part of the bracket 100. The first support block 3132 is installed on the worktable 200, or it can be detachably connected to the worktable 200 to adjust the support position. The second pressing block 312 is connected to the output end of the second driving member 311. The second driving member 311 drives the second pressing block 312 to move downward, which can press the workpiece 600 against the first support block 3132.

[0038] In some embodiments of this utility model, the height of the second pressing block 312 when it abuts against the workpiece 600 is A, the height of the first pressing block 412 when it abuts against the workpiece 600 is B, the relative height difference of the workpiece 600 is Z1 = BA, and after the first pressing block 412 abuts against the workpiece 600, the downward pressing stroke of the first driving member 411 driving the first pressing block 412 is Z2 = 2 * Z1 + 2. Specifically, in actual operation, the positioning and clamping assembly 310 first fixes the workpiece 600. During fixation, the second pressing block 312 abuts against the workpiece 600. It can be understood that the height of the second pressing block 312 can be measured as A. The specific measurement structure is not described in detail here. A sensor can be set on the pressing block for measurement. When the anti-deformation bending mechanism 410 operates, the first driving member 411 first drives the first pressing block 412 to move downward until it abuts against the workpiece 600. At this time, the first driving member 411 stops driving downward and first measures the height of the first pressing block 312. The height B of the first pressure block 412 is determined, and then the relative difference in deformation of the workpiece 600 is Z1 = BA. After knowing Z1, the first driving component 411 continues to drive the first pressure block 412 to press down, and the pressing stroke is Z2 = 2 * Z1 + 2 mm. At the same time as pressing down, the vibration device 500 vibrates in coordination. According to the test, when the first driving component 411 drives the first pressure block 412 to press down for a stroke of Z2 = 2 * Z1 + 2 mm, the shaping effect of the workpiece 600 is relatively good, the correction effect is good, it is not easy to deform excessively, there is no need for repeated shaping, and the efficiency is high.

[0039] In some embodiments of this utility model, the vibration device 500 includes a driving component and two vibration blocks 510. The driving component is mounted on the bracket 100, and the vibration blocks 510 are connected to the driving component in a transmission manner. The driving component can drive the vibration blocks 510 to move up and down, and the vibration blocks 510 are respectively located on both sides of the first pressure block 412. When the first pressure block 412 is pressed down by Z2 strokes, the driving component can drive the vibration blocks 510 to vibrate the deformation part 610. Specifically, the driving component can be a vibrating hydraulic cylinder with a vibration structure. While driving the vibration blocks 510 to move up and down, it can also drive the vibration blocks 510 to vibrate. Two vibration blocks 510 can be provided and located on both sides of the first pressure block 412 so that they can vibrate the workpiece 600 evenly. The vibration frequency can be set to 2 times per second, and the high-frequency striking of the pressing point can be set to 2 minutes. By striking, the internal deformation stress of the workpiece 600 can be quickly released, thereby reducing the shaping time and achieving the effect of rapid shaping.

[0040] In some embodiments of this utility model, the first support member 313 includes a base 3131 and a support block 3132. The base 3131 is disposed on the worktable 200, and the support block 3132 is rotatably disposed on the base 3131. The support block 3132 is made of an elastic material. Specifically, the support block 3132 can be pivotally connected to the base 3131 so that the support block 3132 can move relative to the base 3131. After the workpiece 600 is placed on the support block 3132, the relative sliding between the workpiece 600 and the support block 3132 can be reduced, and instead, the movement is converted to relative movement with respect to the base 3131. This prevents the workpiece 600 from sliding with the support block 3132 and causing scratches on the workpiece 600. Furthermore, the support block 3132 can be made of a non-metallic elastic material to further protect the workpiece 600 from scratches.

[0041] In some embodiments of this utility model, the anti-deformation bending mechanism 410 further includes a second support member 413. The second support member 413 is disposed on the worktable 200 and located below the first pressure block 412, and the support height of the second support member 413 is adjustable. Specifically, the second support member 413 is located below the first pressure block 412 and can play a limiting role to prevent the first pressure block 412 from pressing down excessively during the operation of the anti-deformation bending mechanism 410, causing the workpiece 600 to be scrapped. The second support member 413 can be provided with a threaded structure, and the height can be adjusted by rotation to adjust the limiting range.

[0042] In some embodiments of this utility model, a conveying track 120 and a first driving device 130 are also included on the support 100. An opening 110 is provided on the front side of the support 100. The conveying track 120 extends in the front-rear direction and extends out of the opening 110. A worktable 200 is slidably disposed on the conveying track 120. The first driving device 130 is connected to the worktable 200 to drive the worktable 200 to slide along the extending direction of the conveying track 120. The worktable 200 can be conveyed out of the opening 110 of the support 100 to facilitate the placement of the workpiece 600. After placement, the worktable 200 can be returned towards the opening 110 to facilitate the loading and unloading of the workpiece 600.

[0043] Specifically, the conveyor track 120 and the worktable 200 can be slidably connected by rollers. A rack can be installed at the bottom of the worktable 200. The first drive device 130 can be a drive motor. The output shaft of the drive motor can be equipped with a gear. The gear meshes with the rack to drive the worktable 200 to slide along the conveyor track 120, so as to facilitate the loading and unloading of the workpiece 600.

[0044] In some embodiments of this utility model, the workbench 200 is provided with a first adjustment track 210 and a second adjustment track 220. The first adjustment track 210 extends in the front-to-back direction, and the second adjustment track 220 is slidably connected to the first adjustment track 210 and can slide to adjust its position in the front-to-back direction. The second adjustment track 220 extends in the left-to-right direction, and a first support member 313 and a second support member 413 are slidably disposed on the second adjustment track 220 so that the first support member 313 and the second support member 413 can slide to adjust their position in the left-to-right direction. Specifically, the rapid pace of technological updates in new energy vehicles leads to frequent adjustments to the dimensions of the workpiece 600. The second adjustment track 220 can adjust its position in the front-to-back direction along the first adjustment track 210, while the first support member 313 and the second support member 413 can slide along the second adjustment track 220 to adjust their position in the left-to-right direction. This allows for position adjustment of the first support member 313 and the second support member 413 in the front-to-back and left-to-right directions on the horizontal plane, thereby adjusting the support points to adapt to different workpieces 600.

[0045] Understandably, after the worktable 200 is pulled out, it also allows for easy sliding adjustment of the positions of each support component.

[0046] In some embodiments of this utility model, the bracket 100 is provided with multiple adjustment components 140. Each adjustment component 140 includes a third adjustment rail 141 and a fourth adjustment rail 142. The third adjustment rail 141 extends in the left-right direction, and the fourth adjustment rail 142 extends in the front-back direction and is slidably connected to the third adjustment rail 141. A first driving member 411 or a second driving member 311 is slidably connected to the fourth adjustment rail 142. Specifically, the fourth adjustment rail 142 can slide along the third adjustment rail 141 to adjust its left-right position, while the corresponding first driving member 411 and second driving member 311 can slide with the fourth adjustment rail 142 in the front-back direction. This allows adjustment of the positions of the first driving member 411 and second driving member 311 to adjust various pressing points, thus adapting to different workpieces 600.

[0047] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0048] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A shaping device for the lower casing of an automotive battery, characterized in that, include: Bracket (100); A workbench (200) is provided on the support (100), and the workbench (200) is used to support the workpiece (600); The positioning support device includes at least two positioning clamping assemblies (310), which are disposed on the worktable (200) and / or the bracket (100). The positioning clamping assemblies (310) are capable of clamping and locking the workpiece (600) on the worktable (200). The forming mechanism includes at least one anti-deformation bending mechanism (410), which is capable of pressing against the workpiece (600) to form a deformed portion (610) in the workpiece (600); A vibration device (500) is provided on the support (100). The vibration device (500) can cooperate with the workpiece (600) and vibrate the deformable part (610).

2. The automotive battery lower housing shaping device according to claim 1, characterized in that, The anti-deformation bending mechanism (410) includes a first driving member (411) and a first pressing block (412). The first driving member (411) is disposed on the bracket (100), and the first pressing block (412) is connected to the first driving member (411) in a transmission manner. The first driving member (411) can drive the first pressing block (412) to move toward the workpiece (600).

3. The automotive battery lower housing shaping device according to claim 2, characterized in that, The positioning and clamping assembly (310) includes a second driving member (311), a second pressing block (312), and a first support member (313). The second driving member (311) is disposed on the bracket (100), the second pressing block (312) is connected to the second driving member (311) in a transmission manner, and the first support member (313) is disposed on the worktable (200). The second driving member (311) can drive the second pressing block (312) to move toward the first support member (313) so as to press the workpiece (600) against the first support member (313).

4. The automotive battery lower housing shaping device according to claim 3, characterized in that, The height of the second pressing block (312) when it abuts against the workpiece (600) is A, the height of the first pressing block (412) when it abuts against the workpiece (600) is B, the relative height difference of the workpiece (600) is Z1 = BA, and after the first pressing block (412) abuts against the workpiece (600), the first driving member (411) drives the first pressing block (412) to press down for a stroke of Z2 = 2 * Z1 + 2.

5. The automotive battery lower housing shaping device according to claim 4, characterized in that, The vibration device (500) includes a driving component and two vibration blocks (510). The driving component is disposed on the bracket (100). The vibration blocks (510) are connected to the driving component in a transmission manner. The driving component can drive the vibration blocks (510) to move up and down. The vibration blocks (510) are respectively located on both sides of the first pressure block (412). When the first pressure block (412) is pressed down by Z2 strokes, the driving component can drive the vibration blocks (510) to vibrate the deformable part (610).

6. The automotive battery lower housing shaping device according to claim 3, characterized in that, The first support member (313) includes a base (3131) and a support block (3132). The base (3131) is disposed on the workbench (200), and the support block (3132) is rotatably disposed on the base (3131). The support block (3132) is made of an elastic material.

7. The automotive battery lower housing shaping device according to claim 3, characterized in that, The anti-deformation bending mechanism (410) further includes a second support member (413), which is disposed on the workbench (200) and located below the first pressure block (412), and the support height of the second support member (413) is adjustable.

8. The automotive battery lower housing shaping device according to claim 1, characterized in that, It also includes a conveying track (120) and a first driving device (130) disposed on the support (100). The support (100) has an opening (110) on its front side. The conveying track (120) extends in the front-back direction and extends out of the opening (110). The worktable (200) is slidably disposed on the conveying track (120). The first driving device (130) is connected to the worktable (200) in a transmission connection to drive the worktable (200) to slide along the extension direction of the conveying track (120).

9. A vehicle battery lower housing shaping device according to claim 7, characterized in that, The workbench (200) is provided with a first adjustment track (210) and a second adjustment track (220). The first adjustment track (210) extends in the front-back direction, and the second adjustment track (220) is slidably connected to the first adjustment track (210) and can slide to adjust its position in the front-back direction. The second adjustment track (220) extends in the left-right direction. The first support member (313) and the second support member (413) are slidably disposed on the second adjustment track (220) so that the first support member (313) and the second support member (413) can slide to adjust their positions in the left-right direction.

10. A vehicle battery lower housing shaping device according to claim 9, characterized in that, The bracket (100) is provided with a plurality of adjustment components (140), the adjustment components (140) include a third adjustment rail (141) and a fourth adjustment rail (142), the third adjustment rail (141) extends in the left-right direction, the fourth adjustment rail (142) extends in the front-back direction and is slidably connected to the third adjustment rail (141), and the first driving member (411) or the second driving member (311) is slidably connected to the fourth adjustment rail (142).

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