Back face machining clamp of LED screen bottom shell

Abstract

The utility model discloses an LED screen bottom shell back face machining clamp which comprises a bottom frame, a supporting mechanism, a positioning mechanism, three first clamping mechanisms and a second clamping mechanism, two of the first clamping mechanisms are used for clamping the side wall of one long side edge of a bottom shell, and the other two of the first clamping mechanisms are used for clamping the side wall of the other long side edge of the bottom shell. The other first clamping mechanism is used for clamping the side wall of the other adjacent short side edge of the bottom shell; the second clamping mechanism comprises a second mounting base fixed to the bottom frame, a first sliding base horizontally arranged on the second mounting base in a sliding mode, a second finger clamp arranged on the first sliding base and a second air cylinder driving the second finger clamp to conduct clamping and loosening, and the sliding direction of the first sliding base is parallel to the clamping direction of the second finger clamp. The second finger clamp is used for clamping a reinforcing rib of the bottom shell or the side wall of the other short side edge opposite to the short side edge clamped by the first clamping mechanism. According to the back face machining clamp of the LED screen bottom shell, shaking of the shell can be reduced when a cutter is fed, and machining precision is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of machining fixtures, in particular to a back machining fixture for a bottom shell of an LED screen. Background Art

[0002] In the production process of the bottom shell of the LED screen, first, the bottom shell is formed into a blank by die-casting, and then the back of the bottom shell blank needs to be machined, milled and drilled.

[0003] Before machining the back side of the bottom wall of the bottom shell, the bottom shell needs to be clamped on a machining fixture to fix the bottom shell.

[0004] Structurally, the bottom shell includes a bottom wall and four side walls, an inner cavity is provided between the bottom wall and the four side walls, a reinforcing rib is provided in the middle of the inner cavity, and the reinforcing rib is parallel to the side wall of the short side of the bottom shell.

[0005] In the related art, the existing processing fixture generally fixes and clamps the bottom shell at three points, wherein two clamping positions are at one side wall of the bottom shell, and another clamping position is at an adjacent side wall of the bottom shell.

[0006] However, for a bottom shell with a large projection area, when the bottom shell is clamped and processed using an existing processing fixture, the bottom shell is easily shaken when the tool is fed, which affects the processing accuracy. Utility Model Content

[0007] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a back processing fixture for the bottom shell of an LED screen, which can reduce the shaking of the shell when the tool is fed and improve the processing accuracy.

[0008] According to the first aspect of the utility model, a back processing fixture for the bottom shell of an LED screen comprises: a base frame for being installed and fixed on a processing machine tool; a supporting mechanism comprising four supporting columns, wherein the four supporting columns are respectively used to support the four corners of the bottom shell with the back of the bottom wall facing upward; a positioning mechanism comprising a plurality of positioning rods, wherein the plurality of positioning rods are respectively abutted against the three outer side walls of the bottom shell for positioning; three first clamping mechanisms are provided, wherein two of the first clamping mechanisms are used to clamp the side wall of one long side of the bottom shell, and the other first clamping mechanism is used to clamp the side wall of another adjacent short side of the bottom shell, and the first clamping mechanism It includes a first mounting seat fixed on the base frame, a first finger clamp arranged on the first mounting seat, and a first cylinder driving the first finger clamp to clamp and release; a second clamping mechanism includes a second mounting seat fixed on the base frame, a first slide seat horizontally slidably arranged on the second mounting seat, a second finger clamp arranged on the first slide seat, and a second cylinder driving the second finger clamp to clamp and release, the sliding direction of the first slide seat is parallel to the clamping direction of the second finger clamp, and the second finger clamp is used to clamp the reinforcing rib of the bottom shell or the side wall of the other short side opposite to the short side clamped by the first clamping mechanism.

[0009] According to the embodiment of the utility model, a back processing fixture of the bottom shell of an LED screen has at least the following beneficial effects:

[0010] 1. The utility model provides a base frame, which is used to be installed and fixed on a processing machine tool, thereby facilitating fixing a processing fixture on the processing machine tool.

[0011] 2. The utility model provides a support mechanism, which includes four support columns, which are respectively used to support the four corners of the bottom shell with the back of the bottom wall facing upward, so that the support mechanism can stably support the bottom shell.

[0012] 3. The utility model is provided with a positioning mechanism, which includes a plurality of positioning rods, which are respectively abutted against the three outer side walls of the bottom shell for positioning, so that the positioning mechanism can accurately position the bottom shell.

[0013] 4. The utility model sets three first clamping mechanisms, wherein two first clamping mechanisms are used to clamp the side wall of one long side of the bottom shell, and the other first clamping mechanism is used to clamp the side wall of another adjacent short side of the bottom shell. It can be understood that, on the one hand, by using the first clamping mechanisms to clamp and fix the two adjacent side walls of the bottom shell, different bottom shells can be aligned with the two adjacent side walls during clamping, thereby making the bottom shell accurately fixed in position on the processing fixture; on the other hand, by setting two first clamping mechanisms to clamp the side wall of one long side of the bottom shell, the processing fixture can fix the long side of the bottom shell more firmly.

[0014] 5. The utility model provides a first mounting seat fixed on the base frame, a first finger clamp provided on the first mounting seat and a first cylinder driving the first finger clamp to clamp and release in the first clamping mechanism, thereby facilitating the use of the finger clamp to quickly clamp and release the bottom shell.

[0015] 6. The utility model sets a second clamping mechanism, including a second mounting seat fixed on the base frame, a first slide seat horizontally slidably set on the second mounting seat, a second finger clamp set on the first slide seat and a second cylinder driving the second finger clamp to clamp and release. The sliding direction of the first slide seat is parallel to the clamping direction of the second finger clamp. The second finger clamp is used to clamp the reinforcing rib of the bottom shell or the side wall of the other short side opposite to the short side clamped by the first clamping mechanism. It can be understood that for a bottom shell with a larger projected area, the shrinkage deformation of the bottom shell is relatively large during the die-casting process, resulting in large fluctuations in the sizes of different bottom shells. After the first clamping mechanism clamps and fixes two adjacent side walls, the two outer side walls and the reinforcing ribs of different bottom shells are The position of the rib fluctuates greatly. By arranging the second finger clamp on the first slide, when the second finger clamp clamps different bottom shells, the first slide can slide and adjust its position according to the clamping position of the second finger clamp, so that the position of the second finger clamp adapts to the position of the reinforcing rib or the side wall of the other short side opposite to the short side clamped by the first clamping mechanism, thereby avoiding deformation of the bottom shell clamp when the second clamping mechanism clamps the bottom shell with a large size difference. In addition, by adding the second clamping mechanism to clamp the reinforcing rib in the middle part of the bottom shell or the side wall of the other short side opposite to the short side clamped by the first clamping mechanism, the second clamping mechanism can limit the shaking of the bottom shell in the up and down directions and the horizontal direction, thereby reducing the shaking of the shell when the tool is fed and improving the processing accuracy.

[0016] According to some embodiments of the utility model, three second clamping mechanisms are provided, wherein two of the second clamping mechanisms are used to clamp the reinforcing ribs of the bottom shell, and the other second clamping mechanism is used to clamp the side wall of another short side of the bottom shell opposite to the short side clamped by the first clamping mechanism.

[0017] According to some embodiments of the utility model, a horizontally extending guide bar is provided on the second mounting seat, the length direction of the guide bar is parallel to the clamping direction of the second finger clamp, and a first slide groove is provided at the bottom of the first slide seat, and the first slide groove slides in cooperation with the guide bar.

[0018] According to some embodiments of the utility model, the side wall of the guide bar has a first limiting groove, the first limiting groove is extended along the length direction of the guide bar, the inner side wall of the first sliding groove is provided with a first protrusion, and the first limiting groove cooperates with the first protrusion for upper and lower limiting.

[0019] According to some embodiments of the utility model, a reset assembly is arranged between the second mounting seat and the first slide seat, and the reset assembly includes a first reset piece arranged on the second mounting seat, a second reset piece arranged on the first slide seat, and two reset springs, the two reset springs are respectively located on both sides of the second reset piece along the sliding direction of the first slide seat, the extension and contraction direction of the reset spring is parallel to the sliding direction of the first slide seat, one end of the reset spring abuts against the first reset piece, and the other end of the reset spring abuts against the second reset piece, and the two reset springs are used to drive the second reset piece to reset.

[0020] According to some embodiments of the utility model, the first reset member includes a seat body and two vertical plates arranged on the seat body, the two vertical plates are arranged along the sliding direction of the first sliding seat, the second reset member is located between the two vertical plates, one end of the reset spring abuts against the first reset member, and the other end of the reset spring abuts against the vertical plates.

[0021] According to some embodiments of the utility model, the first reset member further includes a first guide rod, the first guide rod connects the two vertical plates, the second reset member is slidably connected to the first guide rod, and the reset spring is sleeved on the first guide rod.

[0022] According to some embodiments of the utility model, the first resetting member is provided with a first waist hole, the length direction of the first waist hole is parallel to the sliding direction of the first sliding seat, and the first waist hole is provided with a first bolt, and the first bolt is threadedly connected to the second mounting seat.

[0023] According to some embodiments of the utility model, the second finger clamp includes a first clamp fixed on the first slide and a second clamp hinged to the first slide, and the second cylinder drives the second clamp to swing so that the second clamp approaches and moves away from the first clamp.

[0024] According to some embodiments of the utility model, the positioning mechanism also includes a positioning assembly, and several of the positioning rods are respectively abutted and positioned against three outer walls of the bottom shell, and the positioning assembly is used to abut and position another outer wall of the bottom shell. The positioning assembly includes a vertical rod, a positioning column horizontally slidably arranged on the vertical rod, and a second bolt fixing the positioning column on the vertical rod, the positioning column can slide close to and away from the bottom shell, and one end of the positioning column is used to position the outer wall of the bottom shell.

[0025] According to some embodiments of the present invention, the end of the positioning column close to the bottom shell has a semi-spherical portion, and the semi-spherical portion is used to guide the outer side wall of the bottom shell.

[0026] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0028] Figure 1 This is a schematic diagram of the structure of a back processing fixture for a bottom shell of an LED screen according to an embodiment of the utility model;

[0029] Figure 2 for Figure 1 A schematic diagram of the structure from another perspective is shown;

[0030] Figure 3 for Figure 1 A front view is shown;

[0031] Figure 4 for Figure 1 An enlarged view of point A is shown;

[0032] Figure 5 for Figure 3 An enlarged view of point B is shown.

[0033] Figure markings: 100-base frame, 110-support column, 120-positioning rod, 130-first clamping mechanism, 140-first mounting seat, 150-first finger clamp, 160-first cylinder, 170-second clamping mechanism, 180-second mounting seat, 190-first slide seat, 200-second finger clamp, 210-second cylinder, 220-guide bar, 230-first slide groove, 240-first limiting groove, 250-first protrusion, 260-reset assembly, 270-first reset member, 280-second reset member, 290-reset spring, 300-seat body, 310-vertical plate, 320-first guide rod, 330-first waist hole, 340-first bolt, 350-first chuck, 360-second chuck, 370-positioning assembly, 380-vertical rod, 390-positioning column, 400-second bolt. DETAILED DESCRIPTION

[0034] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0035] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The following describes a back processing fixture for the bottom shell of an LED screen according to an embodiment of the utility model in conjunction with the accompanying drawings.

[0039] Reference Figure 1 , Figure 2 and Figure 3 A back processing fixture of a bottom shell of an LED screen according to an embodiment of the utility model includes a base frame 100, a supporting mechanism, a positioning mechanism, a first clamping mechanism 130 and a second clamping mechanism 170.

[0040] The base frame 100 is used to be installed and fixed on a processing machine tool, thereby facilitating fixing a processing fixture on the processing machine tool.

[0041] Specifically, the base frame 100 includes a bottom plate and supporting feet disposed at the bottom of the bottom plate.

[0042] As for the supporting mechanism, the supporting mechanism includes four supporting columns 110, and the four supporting columns 110 are respectively used to support the four corners of the bottom shell with the back of the bottom wall facing upward, so that the supporting mechanism can stably support the bottom shell.

[0043] As for the positioning mechanism, the positioning mechanism includes a plurality of positioning rods 120, and the plurality of positioning rods 120 are respectively abutted against the three outer side walls of the bottom shell for positioning, so that the positioning mechanism can accurately position the bottom shell.

[0044] In some specific embodiments, the positioning mechanism also includes a positioning assembly 370, and a number of positioning rods 120 are respectively abutted and positioned against the three outer walls of the bottom shell. The positioning assembly 370 is used to abut and position another outer wall of the bottom shell. The positioning assembly 370 includes a vertical rod 380, a positioning column 390 horizontally slidably arranged on the vertical rod 380, and a second bolt 400 fixing the positioning column 390 on the vertical rod 380. The positioning column 390 can slide close to and away from the bottom shell, and one end of the positioning column 390 is used to position the outer wall of the bottom shell. Therefore, when the second bolt 400 is loosened, the positioning column 390 can move relative to the vertical rod 380, which is convenient for adjusting the positioning position of the positioning column 390, and then, it is convenient to adjust the positioning gap between the positioning column 390 and the bottom shell.

[0045] Furthermore, the positioning column 390 has a semi-spherical portion at one end close to the bottom shell, and the semi-spherical portion is used to guide the outer wall of the bottom shell, so that the bottom shell can be more easily installed in the positioning mechanism.

[0046] In some specific embodiments, the positioning mechanism is provided with six positioning rods 120 , and three outer side walls of the bottom shell are each provided with two positioning rods 120 for positioning, so that the positioning mechanism can position the bottom shell more accurately.

[0047] As for the first clamping mechanisms 130 , three first clamping mechanisms 130 are provided, wherein two first clamping mechanisms 130 are used to clamp the side wall of one long side of the bottom shell, and another first clamping mechanism 130 is used to clamp the side wall of another adjacent short side of the bottom shell.

[0048] It can be understood that, on the one hand, by using the first clamping mechanism 130 to clamp and fix the two adjacent side walls of the bottom shell, different bottom shells can be aligned with the two adjacent side walls when clamped, thereby making the bottom shell accurately fixed on the processing fixture. On the other hand, by setting two first clamping mechanisms 130 to clamp the side wall of a long side of the bottom shell, the processing fixture can fix the long side of the bottom shell more firmly.

[0049] Specifically, the first clamping mechanism 130 includes a first mounting base 140 fixed on the base frame 100, a first finger clamp 150 arranged on the first mounting base 140, and a first cylinder 160 driving the first finger clamp 150 to clamp and release, so that it is convenient to use the finger clamp to quickly clamp and release the bottom shell.

[0050] Reference Figure 4 and Figure 5As for the second clamping mechanism 170, the second clamping mechanism 170 includes a second mounting seat 180 fixed on the base frame 100, a first slide seat 190 horizontally slidably arranged on the second mounting seat 180, a second finger clamp 200 arranged on the first slide seat 190, and a second cylinder 210 that drives the second finger clamp 200 to clamp and release. The sliding direction of the first slide seat 190 is parallel to the clamping direction of the second finger clamp 200. The second finger clamp 200 is used to clamp the reinforcing rib of the bottom shell or the side wall of the other short side opposite to the short side clamped by the first clamping mechanism 130.

[0051] It can be understood that for a bottom shell with a larger projection area, during the die-casting process, the shrinkage deformation of the bottom shell is relatively large, resulting in large fluctuations in the sizes of different bottom shells. After the first clamping mechanism 130 clamps and fixes two adjacent side walls, the positions of the two outer side walls and the reinforcing ribs of different bottom shells fluctuate greatly. By arranging the second finger clamp 200 on the first slide 190, when the second finger clamp 200 clamps different bottom shells, the first slide 190 can slide and adjust its position according to the clamping position of the second finger clamp 200, so that the second finger clamp 200 can be clamped to the first slide 190. The position of the clamp 200 adapts to the position of the reinforcing rib or the side wall of the other short side opposite to the short side clamped by the first clamping mechanism 130, so as to avoid deformation of the bottom shell when the second clamping mechanism 170 clamps the bottom shell with a large size difference. In addition, by adding the second clamping mechanism 170 to clamp the reinforcing rib in the middle part of the bottom shell or the side wall of the other short side opposite to the short side clamped by the first clamping mechanism 130, the second clamping mechanism 170 can limit the shaking of the bottom shell in the up and down directions and the horizontal direction, thereby reducing the shaking of the shell when the tool is fed and improving the processing accuracy.

[0052] In some specific embodiments, three second clamping mechanisms 170 are provided, wherein two second clamping mechanisms 170 are used to clamp the reinforcing ribs of the bottom shell, and the other second clamping mechanism 170 is used to clamp the side wall of the other short side opposite to the short side clamped by the first clamping mechanism 130 in the bottom shell. Thus, the three second clamping mechanisms 170 can simultaneously clamp the reinforcing ribs of the bottom shell and the side wall of the other short side opposite to the short side clamped by the first clamping mechanism 130 in the bottom shell, thereby increasing the clamping position of the processing fixture on the bottom shell, thereby further reducing the shaking of the shell during tool feeding and improving the processing accuracy.

[0053] In some specific embodiments, a horizontally extending guide bar 220 is provided on the second mounting seat 180, and the length direction of the guide bar 220 is parallel to the clamping direction of the second finger clamp 200. A first slide groove 230 is provided at the bottom of the first slide seat 190, and the first slide groove 230 slides in cooperation with the guide bar 220, thereby making the sliding of the first slide seat 190 more stable.

[0054] Furthermore, the side wall of the guide bar 220 has a first limiting groove 240, and the first limiting groove 240 is extended along the length direction of the guide bar 220. The inner wall of the first slide groove 230 is provided with a first protrusion 250. The first limiting groove 240 and the first protrusion 250 cooperate with each other to limit up and down, thereby preventing the first slide groove 230 from shaking up and down, and then reducing the up and down shaking of the second finger clamp 200, so that the second finger clamp 200 clamps the bottom shell more stably.

[0055] In some specific embodiments, a reset assembly 260 is arranged between the second mounting seat 180 and the first slide seat 190, and the reset assembly 260 includes a first reset member 270 arranged on the second mounting seat 180, a second reset member 280 arranged on the first slide seat 190, and two reset springs 290. The two reset springs 290 are respectively located on both sides of the second reset member 280 along the sliding direction of the first slide seat 190. The extension and contraction direction of the reset spring 290 is parallel to the sliding direction of the first slide seat 190. One end of the reset spring 290 abuts against the first reset member 270, and the other end of the reset spring 290 abuts against the second reset member 280. The two reset springs 290 are used to drive the second reset member 280 to reset.

[0056] It can be understood that when the second clamping mechanism 170 clamps the bottom shell, after the first slide 190 moves, the second reset member 280 cooperates with the first reset member 270 to compress one of the reset springs 290. When the second clamping mechanism 170 releases the bottom shell, the compressed reset spring 290 drives the second reset member 280 to reset, thereby, the second reset member 280 drives the first slide 190 to reset, and then, the second finger clamp 200 can return to its original position when loosening, so that the second finger clamp 200 can clamp the next bottom shell conveniently.

[0057] In some specific embodiments, the first return member 270 includes a seat body 300 and two vertical plates 310 arranged on the seat body 300. The two vertical plates 310 are arranged along the sliding direction of the first slide seat 190. The second return member 280 is located between the two vertical plates 310. One end of the return spring 290 abuts against the first return member 270, and the other end of the return spring 290 abuts against the vertical plates 310. Therefore, on the one hand, the two vertical plates 310 can support the two return springs 290, and on the other hand, the space between the two vertical plates 310 can accommodate the movement of the second return member 280 to prevent the first return member 270 from interfering with the second return member 280.

[0058] In some specific embodiments, the first reset member 270 also includes a first guide rod 320, the first guide rod 320 connects the two vertical plates 310, the second reset member 280 is slidably connected to the first guide rod 320, and the reset spring 290 is mounted on the first guide rod 320, thereby making the movement of the second reset member 280 smoother and the installation of the reset spring 290 more secure.

[0059] In some specific embodiments, the first resetting member 270 is provided with a first waist hole 330 , the length direction of the first waist hole 330 is parallel to the sliding direction of the first slide seat 190 , and the first waist hole 330 is provided with a first bolt 340 , which is threadedly connected to the second mounting seat 180 .

[0060] It is understandable that after loosening the first bolt 340, the first reset member 270 can move relative to the second mounting seat 180 along the length direction of the first waist hole 330, thereby facilitating adjustment of the position of the first reset member 270 on the second mounting seat 180, and further facilitating adjustment of the original position of the second finger clamp 200.

[0061] In some specific embodiments, the second finger clamp 200 includes a first clamp 350 fixed on the first slide 190 and a second clamp 360 hinged to the first slide 190. The second cylinder 210 drives the second clamp 360 to swing so that the second clamp 360 approaches and moves away from the first clamp 350. Therefore, since the first clamp 350 is fixed on the first slide 190, the second clamp 360 and the first clamp 350 cooperate to clamp the bottom shell more firmly.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0063] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A back processing fixture for the bottom shell of an LED screen, characterized in that: include: A base frame (100) is used for being installed and fixed on a processing machine tool; A supporting mechanism, comprising four supporting columns (110), wherein the four supporting columns (110) are respectively used to support four corners of the bottom shell with the back of the bottom wall facing upward; The positioning mechanism comprises a plurality of positioning rods (120), wherein the plurality of positioning rods (120) are respectively abutted against three outer side walls of the bottom shell for positioning; Three first clamping mechanisms (130) are provided, wherein two of the first clamping mechanisms (130) are used to clamp the side wall of one long side of the bottom shell, and another first clamping mechanism (130) is used to clamp the side wall of another adjacent short side of the bottom shell, and the first clamping mechanism (130) comprises a first mounting seat (140) fixed on the bottom frame (100), a first finger clamp (150) provided on the first mounting seat (140), and a first cylinder (160) for driving the first finger clamp (150) to clamp and release; The second clamping mechanism (170) comprises a second mounting seat (180) fixed on the base frame (100), a first slide seat (190) horizontally slidably arranged on the second mounting seat (180), a second finger clamp (200) arranged on the first slide seat (190), and a second cylinder (210) for driving the second finger clamp (200) to clamp and release, wherein the sliding direction of the first slide seat (190) is parallel to the clamping direction of the second finger clamp (200), and the second finger clamp (200) is used to clamp the reinforcing rib of the bottom shell or the side wall of the other short side opposite to the short side clamped by the first clamping mechanism (130).

2. The back processing fixture of the bottom shell of the LED screen according to claim 1 is characterized in that: Three second clamping mechanisms (170) are provided, two of which are used to clamp the reinforcing ribs of the bottom shell, and another second clamping mechanism (170) is used to clamp the side wall of another short side of the bottom shell opposite to the short side clamped by the first clamping mechanism (130).

3. The back processing fixture of the bottom shell of the LED screen according to claim 1 is characterized in that: A horizontally extending guide bar (220) is provided on the second mounting seat (180), and the length direction of the guide bar (220) is parallel to the clamping direction of the second finger clamp (200). A first slide groove (230) is provided at the bottom of the first slide seat (190), and the first slide groove (230) slides in cooperation with the guide bar (220).

4. The back processing fixture of the bottom shell of the LED screen according to claim 3 is characterized in that: The side wall of the guide bar (220) has a first limiting groove (240), and the first limiting groove (240) is extended along the length direction of the guide bar (220). The inner side wall of the first sliding groove (230) is provided with a first protrusion (250), and the first limiting groove (240) cooperates with the first protrusion (250) to limit up and down.

5. The back processing fixture of the bottom shell of the LED screen according to claim 1, characterized in that: A reset assembly (260) is arranged between the second mounting seat (180) and the first slide seat (190), and the reset assembly (260) includes a first reset member (270) arranged on the second mounting seat (180), a second reset member (280) arranged on the first slide seat (190), and two reset springs (290). The two reset springs (290) are respectively located on both sides of the second reset member (280) along the sliding direction of the first slide seat (190). The expansion and contraction direction of the reset spring (290) is parallel to the sliding direction of the first slide seat (190). One end of the reset spring (290) abuts against the first reset member (270), and the other end of the reset spring (290) abuts against the second reset member (280). The two reset springs (290) are used to drive the second reset member (280) to reset.

6. The back processing fixture of the bottom shell of the LED screen according to claim 5, characterized in that: The first reset member (270) comprises a seat body (300) and two vertical plates (310) arranged on the seat body (300), wherein the two vertical plates (310) are arranged in an array along the sliding direction of the first sliding seat (190), and the second reset member (280) is located between the two vertical plates (310), and one end of the reset spring (290) abuts against the first reset member (270), and the other end of the reset spring (290) abuts against the vertical plates (310).

7. The back processing fixture of the bottom shell of the LED screen according to claim 6, characterized in that: The first reset member (270) further comprises a first guide rod (320), wherein the first guide rod (320) connects the two vertical plates (310), the second reset member (280) is slidably connected to the first guide rod (320), and the reset spring (290) is sleeved on the first guide rod (320).

8. The back processing fixture of the bottom shell of the LED screen according to claim 5, characterized in that: The first resetting member (270) is provided with a first waist hole (330), the length direction of the first waist hole (330) is parallel to the sliding direction of the first sliding seat (190), and the first waist hole (330) is provided with a first bolt (340), and the first bolt (340) is threadedly connected to the second mounting seat (180).

9. The back processing fixture of the bottom shell of the LED screen according to claim 1, characterized in that: The second finger clamp (200) comprises a first clamp (350) fixed on the first slide (190) and a second clamp (360) hinged to the first slide (190), and the second cylinder (210) drives the second clamp (360) to swing so that the second clamp (360) approaches and moves away from the first clamp (350).

10. The back processing fixture of the bottom shell of the LED screen according to claim 1, characterized in that: The positioning mechanism also includes a positioning assembly (370), wherein a plurality of the positioning rods (120) are respectively abutted against the three outer walls of the bottom shell for positioning, and the positioning assembly (370) is used to abut against and position another outer wall of the bottom shell. The positioning assembly (370) includes a vertical rod (380), a positioning column (390) horizontally slidably arranged on the vertical rod (380), and a second bolt (400) fixing the positioning column (390) on the vertical rod (380). The positioning column (390) can slide toward and away from the bottom shell, and one end of the positioning column (390) is used to position the outer wall of the bottom shell.

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