A limiting tool

Abstract

The utility model discloses a limit frock for tobacco packaging machine, include: limit piece, be equipped with the first threaded hole of the first direction through -going limit piece on it, first screw, through -going first threaded hole and with first threaded hole screw connection, connecting piece, be located the below of limit piece and be linked with limit piece, be equipped with the second threaded hole of the first direction through -going connecting piece on connecting piece, second screw, through -going second threaded hole and with second threaded hole screw connection, when first push -pad is located first preset position and second push -pad is located second preset position, limit piece can be inserted between first push -pad and first cover, and limit piece and first push -pad abut, the end of first screw and first cover abut, the end of second screw and second push -pad abut. The limit frock provided by the utility model can maintain the extractor starting position unchanged, does not need manpower to maintain, not only simplifies the operation process, but also improves the maintenance efficiency, reduces the maintenance intensity.

Description

Technical Field

[0001] This utility model relates to the technical field of cigarette processing and packaging equipment, and in particular to a limiting tooling. Background Technology

[0002] The YB41 tobacco packaging machine is a model used for producing hard-pack tobacco products. Its output channel is equipped with an extractor at the end, used to reliably and smoothly remove the packaged hard-pack tobacco cartons from the machine's output channel and accurately and orderly place them onto the downstream conveyor belt or subsequent processing equipment. The extractor achieves rhythm switching through two actions: when it extends, it receives the tobacco cartons pushed from upstream; when it retracts, it places the tobacco cartons onto the downstream conveyor belt. If the extractor's positioning is inaccurate, it may not only cause the extractor's push plate to hit the edge of the tobacco cartons, resulting in dents, wrinkles, or tears in the label paper, but it may also cause the tobacco cartons to become misaligned and stuck in the output channel, causing them to be deformed by subsequent tobacco cartons.

[0003] When repairing the components of the extractor, the extractor must be maintained in its corresponding starting position. The extractor of the YB416 hard box packaging machine includes a first extractor and a second extractor. When the first extractor is at its farthest end and the second extractor is at its closest end, they are in their corresponding starting positions. In the existing technology, the starting position is usually maintained manually by maintenance personnel. However, due to the linkage between the first and second extractors and the presence of multiple transmission mechanisms within the machine, maintaining the starting position manually is difficult and inaccurate. Once the phase of the extractor changes, it needs to be recalibrated to the starting position before subsequent maintenance work can be carried out. This not only makes the operation process complex and cumbersome but also reduces the maintenance efficiency of maintenance personnel and increases the intensity of maintenance work. Utility Model Content

[0004] The purpose of this invention is to solve the technical problem of the difficulty and poor accuracy of manual maintenance of the cigarette pack extractor in the prior art. This invention provides a limiting fixture that allows the extractor to maintain its starting position automatically during maintenance, eliminating the need for manual maintenance. This not only simplifies the operation process but also improves the maintenance efficiency and reduces the workload of maintenance personnel.

[0005] To solve the above-mentioned technical problems, this utility model discloses a limiting fixture for a tobacco packaging machine. The tobacco packaging machine includes a first cover plate, a second cover plate, a first push plate, and a second push plate. Both the first and second cover plates are perpendicular to a first direction. The first push plate can slide relative to the first cover plate along the first direction to move closer to or away from the first cover plate. The second push plate can slide relative to the second cover plate along the first direction to move closer to or away from the second cover plate. The limiting fixture is used to restrict the displacement of the first and second push plates along the first direction, so as to limit the first push plate to a first preset position away from the first cover plate and limit the second push plate to a second preset position close to the second cover plate. The limiting fixture includes:

[0006] A limiting block, wherein the limiting block is provided with a first threaded hole that passes through the limiting block in a first direction;

[0007] The first screw passes through the first threaded hole and is threadedly connected to the first threaded hole;

[0008] A connector is located below the limiting block and connected to the limiting block. The connector has a second threaded hole that passes through the connector in the first direction.

[0009] The second screw passes through the second threaded hole and is threaded into the second threaded hole;

[0010] When the first push plate is in the first preset position and the second push plate is in the second preset position, the limiting block can be inserted between the first push plate and the first cover plate, and the limiting block abuts against the first push plate, the end of the first screw abuts against the first cover plate, and the end of the second screw abuts against the second push plate.

[0011] When the extractor is in the initial position, the operator inserts the limiting fixture from bottom to top between the first cover plate and the first push plate, ensuring that the side of the limiting block facing the first push plate abuts against it. Then, the first screw and the second screw are tightened respectively, so that their ends abut against the first cover plate and the second push plate. At this point, the first and second extractors remain in their initial positions under the action of the limiting fixture.

[0012] Using the above technical solution, the first and second extractors can be held in their initial positions by the limiting fixture, eliminating the need for manual maintenance, thus reducing the workload and improving the efficiency of maintenance personnel. Furthermore, the fixture can be removed simply by loosening all the screws after maintenance, making it simple and convenient to use.

[0013] Optionally, the first cover plate is provided with a first opening that penetrates the first cover plate in a first direction, and the projection of the first push plate in the first direction covers at least part of the first opening; the limiting block is provided with a fixing member, and the fixing member is provided with a third threaded hole that penetrates the fixing member in a first direction, and the third screw penetrates the third threaded hole and is threadedly connected to the third threaded hole.

[0014] A movable block is provided between the third screw and the first cover plate. The length of the movable block along the second direction is greater than the length of the first opening along the second direction. The second direction is perpendicular to the first direction. The end of the third screw abuts against the movable block, and the movable block abuts against the first cover plate.

[0015] Optionally, a first groove is provided on the side wall of the fastener facing the first cover plate, and the first groove penetrates the fastener in a second direction; the movable block is inserted into the first groove and can move in the first groove in a first direction.

[0016] Using the above technical solution, the first groove can limit the movement of the moving block to prevent it from rotating.

[0017] Optionally, the projection of the movable block on the first cover plate spans the first opening, and the two ends of the movable block can abut against the first cover plate on both sides of the first opening.

[0018] By adopting the above technical solution, by setting a movable block that can span the first opening and making the two ends of the movable block abut against the first cover plates on both sides of the first opening, the contact area between the tooling and the first cover plate can be increased. At the same time, the contact points between the first screw and the first cover plate and the contact points between the two ends of the movable block and the first cover plate can form a triangular arrangement, making the force more balanced and thus improving the stability of the limit insertion.

[0019] Optionally, the connector includes a first connecting plate, a second connecting plate, and a third connecting plate. The first and second connecting plates both extend along a third direction, which is perpendicular to the first and second directions, respectively. The third connecting plate is located between the first and second connecting plates and extends along the first direction. Both ends of the third connecting plate are connected to the first and second connecting plates, respectively. The distance between the first connecting plate and the second cover plate is greater than the distance between the second connecting plate and the second cover plate. The first connecting plate is connected to the limiting block, and the second threaded hole is provided on the second connecting plate.

[0020] By adopting the above technical solution, the part between the limiting component and the third connecting plate is hollowed out, which can save the manufacturing materials of the limiting tooling, resulting in lower cost and a lighter device.

[0021] Optionally, the number of second screws is at least three.

[0022] Optionally, the second push plate is provided with four second connecting posts extending along the first direction. Each second connecting post is located at one of the four corners of the second push plate. There are four second screws, and the position where each second screw abuts against the second push plate corresponds one-to-one with the position of each second connecting post.

[0023] Using the above technical solution, the four-point support has high load-bearing capacity and strong resistance to deformation.

[0024] Optionally, the first push plate is provided with four first connecting posts extending along the first direction, each first connecting post being disposed at one of the four corners of the first push plate, and the length of the limiting block along the second direction is less than the spacing between two first connecting posts spaced apart along the second direction.

[0025] Using the above technical solution, the limiting block can be smoothly inserted between two first connecting posts spaced apart along the second direction without colliding or interfering with the first connecting rod.

[0026] Optionally, both the limiting block and the connecting piece are made of aluminum alloy or stainless steel, and the limiting block and the connecting piece are fixedly connected by welding.

[0027] By adopting the above technical solution, the material of the limiting block and the connecting parts is set to aluminum alloy or stainless steel to increase the rigidity and strength of the limiting tooling, so that it can withstand greater forces during use. Attached Figure Description

[0028] Figure 1 This diagram shows a schematic representation of the extractor provided in one embodiment of the present invention.

[0029] Figure 2 Show Figure 1 Side view;

[0030] Figure 3 This diagram shows a partial structural schematic of a limiting fixture provided in an embodiment of the present invention;

[0031] Figure 4 This diagram shows the overall structure of the limiting tooling provided in an embodiment of the present invention;

[0032] Figure 5 Show Figure 4 Side view;

[0033] Figure 6 This diagram illustrates a usage scenario of the limiting fixture provided in an embodiment of the present invention.

[0034] Figure 7 Show Figure 6 Side view.

[0035] Figure label:

[0036] 1. First extractor; 11. First push plate; 111. First connecting post; 112. First through groove; 12. First connecting rod; 2. Second extractor; 21. Second push plate; 211. Second connecting post; 212. Second through groove; 22. Second connecting rod; 3. First cover plate; 31. First opening; 4. Second cover plate; 41. Second opening; 5. Limiting block; 51. First threaded hole; 52. First screw; 53. First groove; 6. Connector; 61. Second threaded hole; 62. Second screw; 63. First connecting plate; 64. Second connecting plate; 65. Third connecting plate; 66. Auxiliary screw pre-drilled hole; 7. Fixing component; 71. Third threaded hole; 72. Third screw; 8. Moving block. Detailed Implementation

[0037] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Although the description of this utility model will be presented in conjunction with preferred embodiments, this does not mean that the features of this utility model are limited to this embodiment. On the contrary, the purpose of describing the utility model in conjunction with the embodiments is to cover other options or modifications that may be derived based on the claims of this utility model. To provide a deep understanding of this utility model, many specific details will be included in the following description. This utility model may also be implemented without using these details. Furthermore, to avoid confusion or obscuring the focus of this utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0038] It should be noted that in this specification, similar reference numerals and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0039] In the description of this embodiment, it should be noted that the terms "upper", "lower", "inner", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They are only for the convenience of describing the utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on the utility model.

[0040] The terms “first”, “second”, etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0041] In the description of this embodiment, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set up," "connected," and "linked" 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 embodiment based on the specific circumstances.

[0042] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0043] See Figure 1 and Figure 2 The YB416 type hard box packaging machine's extractor includes a first extractor 1, a second extractor 2, a first cover plate 3, and a second cover plate 4. Both the first cover plate 3 and the second cover plate 4 are perpendicular to a first direction (e.g., Figure 2 (shown in the X direction), the first cover plate 3 is provided with a first opening 31 that penetrates the first cover plate 3 along the first direction, and the second cover plate 4 is provided with a second opening 41 that penetrates the second cover plate 4 along the first direction. The projection of the first push plate 11 along the first direction covers at least part of the first opening 31, and the projection of the second push plate 21 along the first direction covers at least part of the second opening 41. The first opening 31 and the second opening 41 are respectively used for the first extractor 1 and the second extractor 2 to pass through.

[0044] See Figure 2 The first extractor 1 includes a first push plate 11 and a first connecting rod 12. The first connecting rod 12 extends along the X direction, and one end of the first connecting rod 12 is connected to the first push plate 11. The first push plate 11 is parallel to the first cover plate 3. The second extractor 2 includes a second push plate 21 and a second connecting rod 22. The second connecting rod 22 extends along the X direction, and one end of the second connecting rod 22 is connected to the second push plate 21. The second push plate 21 is parallel to the second cover plate 4. The first push plate 11 has four first connecting posts 111 extending along the X direction, each first connecting post 111 being located at one of the four corners of the first push plate 11. The second push plate 21 has four second connecting posts 211 extending along the X direction, each second connecting post 211 being located at one of the four corners of the second push plate 21. The two connecting posts located at the top are used to install suction cups (not shown in the figure), which are used to adsorb the cigarette pack. The two connecting posts located at the bottom are used to fix the first connecting rod 12 or the second connecting rod 22.

[0045] A cylinder is provided below both the first connecting rod 12 and the second connecting rod 22. The cylinder drives the first extractor 1 and the second extractor 2 to reciprocate along the X direction, so that the extractors are inserted into or extracted from the cover plate. During this process, the first push plate 11 can slide relative to the first cover plate 3 along the X direction to move closer to or away from the first cover plate 3. The second push plate 21 can slide relative to the second cover plate 4 along the X direction to move closer to or away from the second cover plate 4. During the operation of the equipment, the movement direction of the first extractor 1 is opposite to that of the second extractor 2. When the first push plate 11 is at its extreme position away from the first cover plate 3 (i.e., the first preset position, such as...), the extraction mechanism... Figure 2 The position of the first push plate 11 is shown in the figure, and the second push plate 21 is located at the extreme position near the second cover plate 4 (i.e., the second preset position, such as...). Figure 2 When the position of the second push plate 21 is shown, the two extractors are in the starting position.

[0046] In existing technologies, the two extractors are typically held in their initial position manually for maintenance. However, manual holding is quite difficult. To solve the above technical problems, see [reference needed]. Figure 4 The present invention discloses a limiting fixture for a tobacco packaging machine, which is used to limit the displacement of the first push plate 11 and the second push plate 21 along the first direction, so as to limit the first push plate 11 to a first preset position away from the first cover plate 3 and limit the second push plate 21 to a second preset position close to the second cover plate 4, thereby reducing the difficulty of operation for the operator.

[0047] See Figure 3 and Figure 5 The limiting fixture provided in this embodiment includes a limiting block 5, a first screw 52, ​​a connecting member 6, and a second screw 62. The limiting block 5 has a first threaded hole 51 penetrating the limiting block 5 in the X direction, and the first screw 52 penetrates the first threaded hole 51 and is threadedly connected to the first threaded hole 51. The connecting member 6 is located below the limiting block 5 and connected to the bottom of the limiting block 5. The connecting member 6 has a second threaded hole 61 penetrating the connecting member 6 in the X direction, and the second screw 62 penetrates the second threaded hole 61 and is threadedly connected to the second threaded hole 61. See also... Figure 7 When the two extractors are in the starting position, the limiting block 5 can be inserted between the first push plate 11 and the first cover plate 3, and the limiting block 5 abuts against the first push plate 11, the end of the first screw 52 abuts against the first cover plate 3, and the end of the second screw 62 abuts against the second push plate 21.

[0048] When the extractor is in the initial position, the operator inserts the limiting fixture from bottom to top between the first cover plate 3 and the first push plate 11, so that the side of the limiting block 5 facing the first push plate 11 abuts against the first push plate 11. Then, the first screw 52 and the second screw 62 are tightened respectively, so that the ends of the first screw 52 and the second screw 62 abut against the first cover plate 3 and the second push plate 21 respectively. At this time, the first extractor 1 and the second extractor 2 remain in the initial position by themselves under the action of the limiting fixture.

[0049] Using the above technical solution, the first extractor 1 and the second extractor 2 can be held in their initial positions by the limiting action of the limiting fixture, eliminating the need for manual maintenance, reducing the workload of maintenance personnel, and improving their maintenance efficiency. Furthermore, after maintenance, the fixture can be removed simply by loosening all the screws, making it simple to operate and convenient to use.

[0050] Specifically, both the limiting block 5 and the connecting piece 6 are made of aluminum alloy or stainless steel, and the limiting block 5 and the connecting piece 6 are fixedly connected by welding. By setting the materials of the limiting block 5 and the connecting piece 6 to aluminum alloy or stainless steel, the rigidity and strength of the limiting fixture are increased, enabling it to withstand greater forces during use.

[0051] Further, see Figure 3 and Figure 5 The limiting block 5 is provided with a fixing member 7, and the fixing member 7 has a third threaded hole 71 that penetrates the fixing member 7 in the X direction. A third screw 72 penetrates the third threaded hole 71 and is threadedly connected to the third threaded hole 71. See also Figure 7 A movable block 8 is provided between the third screw 72 and the first cover plate 3. When the maintenance personnel limit the first extractor 1, they place the movable block 8 between the third screw 72 and the first cover plate 3, and then tighten the third screw 72. The third screw 72 can apply a force to the movable block 8 toward the first cover plate 3, so that the movable block 8 abuts against the first cover plate 3.

[0052] Specifically, see Figure 6 Move block 8 along the second direction (e.g.) Figure 6The length of the first opening 31 in the Y direction (as shown) is greater than the length of the first opening 31 in the second direction, which is perpendicular to the first direction. For example, the movable block 8 extends along the Y direction, and its projection on the first cover plate 3 spans the first opening 31. Both ends of the movable block 8 can abut against the first cover plates 3 on both sides of the first opening 31. By providing a movable block 8 that can span the first opening 31 and abut against the first cover plates 3 on both sides of the first opening 31, this embodiment of the application increases the contact area between the tooling and the first cover plate 3. Simultaneously, the contact points between the first screw 52 and the first cover plate 3, as well as the contact points between the two ends of the movable block 8 and the first cover plate 3, can form a triangular arrangement, making the force more balanced and thus improving the stability of the positioning insertion.

[0053] Specifically, see Figure 5 A first groove 53 is provided on the side wall of the fixing member 7 facing the first cover plate 3. The first groove 53 penetrates the fixing member 7 along the second direction, and the moving block 8 is inserted into the first groove 53. The first groove 53 is used to limit the moving block 8 to prevent the moving block 8 from rotating, while the moving block 8 can move in the X direction within the first groove 53.

[0054] Furthermore, the number of second screws 62 is at least three. See also Figure 6 In one embodiment of this utility model, exemplarily, there are three second screws 62, and the positions where each second screw 62 abuts against the second push plate 21 correspond one-to-one with the positions of at least three second connecting posts 211. The at least three second screws 62 ensure that the limiting fixture and the second push plate 21 have at least three force-bearing points. The three force-bearing points in the triangular layout have high stability and can better resist vibration and impact. In another embodiment of this utility model, exemplarily, there are four second screws 62, and the positions where each second screw 62 abuts against the second push plate 21 correspond one-to-one with the positions of each second connecting post 211. Compared to three-point support, four-point support has higher load-bearing capacity and stronger resistance to deformation.

[0055] Further, see Figure 6 The length of the limiting block 5 along the Y direction is less than the distance between the two first connecting posts 111 spaced apart along the second direction. This design allows the limiting block 5 to be smoothly inserted between the two first connecting posts 111 spaced apart along the second direction without colliding or interfering with the first connecting rod 12.

[0056] Further, see Figure 5 The connector 6 includes a first connecting plate 63, a second connecting plate 64, and a third connecting plate 65. Both the first connecting plate 63 and the second connecting plate 64 are along a third direction (e.g., ...). Figure 5The third connecting plate 65 extends along the Z direction (as shown in the diagram), and the third connecting plate 65 is perpendicular to the first and second directions, respectively. The third connecting plate 65 is located between the first connecting plate 63 and the second connecting plate 64, and extends along the X direction. Both ends of the third connecting plate 65 are connected to the first connecting plate 63 and the second connecting plate 64, respectively. See also... Figure 7 The distance between the first connecting plate 63 and the second cover plate 4 is greater than the distance between the second connecting plate 64 and the second cover plate 4. The first connecting plate 63 is connected to the limiting block 5, and the second threaded hole 61 is provided on the second connecting plate 64. The part between the limiting component and the third connecting plate 65 is hollowed out, which can save the manufacturing materials of the limiting tooling, resulting in lower cost and a lighter device.

[0057] See Figure 4 and Figure 6 In one embodiment of this utility model, exemplarily, the third connecting plate 65 is C-shaped. The projection of the third connecting plate 65 onto the second push plate 21 is at least partially not aligned with the second push plate 21. The second connecting plate 64 has three second threaded holes 61 and one auxiliary screw pre-drilled hole 66. The three second threaded holes 61 correspond one-to-one with the positions of at least three second connecting posts 211. The first push plate 11 has a first through groove 112 extending through the first push plate 11 in the X direction, and the second push plate 21 has a second through groove 212 extending through the second push plate 21 in the X direction. The suction cup air tube (not shown in the figure) extends from the extractor through the through groove. The partially hollowed-out third connecting plate 65 avoids interference with the suction cup air tube, and the auxiliary screw pre-drilled hole 66 is used to subsequently increase the force-bearing points.

[0058] When maintenance personnel need to maintain the first extractor 1 and the second extractor 2 in their corresponding starting positions while repairing the relevant components of the extractor, they first adjust the positions of the first extractor 1 and the second extractor 2 to their starting positions, and then place the limiting fixture between the first cover plate 3 and the first push plate 11 from bottom to top. Since the moving block 8 and the fixing member 7 are detachably connected, the moving block 8 can be inserted into the first groove 53 along the second direction after the limiting fixture is placed between the first cover plate 3 and the first push plate 11.

[0059] Subsequently, the operator brings the limiting block 5 into contact with the first push plate 11, and then screws the first screw 52, ​​the three second screws 62, and the third screw 72 respectively, so that the end of the first screw 52 abuts against the first cover plate 3, the ends of the three second screws 62 abut against the three second connecting posts 211 respectively, and both ends of the moving block 8 abut against the first cover plate 3. At this time, the limiting fixture is set up, and the first extractor 1 and the second extractor 2 can always be stably maintained in their corresponding starting positions during the maintenance process.

[0060] After the maintenance is completed, first loosen the third screw 72 and pull the moving block 8 out of the first groove 53. Then loosen the first screw 52 and the three second screws 62 in sequence. After all the screws are loosened, the limiting fixture can be pulled out from the first push plate 11 and the first cover plate 3 from top to bottom to complete the disassembly of the limiting fixture.

[0061] The limiting fixture provided by this utility model is simple to operate and easy to use. It can maintain the starting position of the extractor unchanged during the maintenance process, avoiding the problem that it is difficult and inaccurate for operators to manually maintain the starting position. This reduces the maintenance intensity of maintenance personnel and improves their maintenance efficiency.

[0062] Although the present invention has been illustrated and described with reference to certain preferred embodiments, those skilled in the art should understand that the above description is a further detailed explanation of the present invention in conjunction with specific embodiments, and should not be construed as limiting the specific implementation of the present invention to these descriptions. Those skilled in the art can make various changes in form and detail, including some simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A limiting fixture for a tobacco packaging machine, the tobacco packaging machine comprising a first cover plate, a second cover plate, a first push plate, and a second push plate, wherein the first cover plate and the second cover plate are both perpendicular to a first direction; the first push plate is slidable relative to the first cover plate along the first direction to move closer to or further away from the first cover plate; the second push plate is slidable relative to the second cover plate along the first direction to move closer to or further away from the second cover plate; characterized in that, The limiting fixture is used to restrict the displacement of the first push plate and the second push plate along the first direction, so as to limit the first push plate to a first preset position away from the first cover plate, and limit the second push plate to a second preset position close to the second cover plate; the limiting fixture includes: A limiting block, wherein the limiting block is provided with a first threaded hole that passes through the limiting block along the first direction; The first screw passes through the first threaded hole and is threadedly connected to the first threaded hole; A connector is provided below the limiting block and connected to the limiting block, and the connector is provided with a second threaded hole that penetrates the connector along the first direction; The second screw passes through the second threaded hole and is threaded into the second threaded hole; When the first push plate is located at the first preset position and the second push plate is located at the second preset position, the limiting block can be inserted between the first push plate and the first cover plate, and the limiting block abuts against the first push plate, the end of the first screw abuts against the first cover plate, and the end of the second screw abuts against the second push plate.

2. The limiting fixture as described in claim 1, characterized in that, The first cover plate is provided with a first opening that penetrates the first cover plate along the first direction, and the projection of the first push plate along the first direction covers at least part of the first opening; the limiting block is provided with a fixing member, and the fixing member is provided with a third threaded hole that penetrates the fixing member along the first direction, and a third screw penetrates the third threaded hole and is threadedly connected to the third threaded hole. A movable block is provided between the third screw and the first cover plate. The length of the movable block along the second direction is greater than the length of the first opening along the second direction. The second direction is perpendicular to the first direction. The end of the third screw abuts against the movable block, and the movable block abuts against the first cover plate.

3. The limiting fixture as described in claim 2, characterized in that, The fixing member has a first groove on the side wall facing the first cover plate, and the first groove penetrates the fixing member along the second direction; the moving block is inserted into the first groove, and the moving block can move along the first direction within the first groove.

4. The limiting fixture as described in claim 3, characterized in that, The projection of the movable block onto the first cover plate spans the first opening, and both ends of the movable block can abut against the first cover plate on both sides of the first opening.

5. The limiting fixture as described in claim 2, characterized in that, The connector includes a first connecting plate, a second connecting plate, and a third connecting plate. The first connecting plate and the second connecting plate both extend along a third direction, which is perpendicular to the first direction and the second direction, respectively. The third connecting plate is located between the first connecting plate and the second connecting plate and extends along the first direction. Both ends of the third connecting plate are connected to the first connecting plate and the second connecting plate, respectively. The distance between the first connecting plate and the second cover plate is greater than the distance between the second connecting plate and the second cover plate. The first connecting plate is connected to the limiting block, and the second threaded hole is provided on the second connecting plate.

6. The limiting fixture as described in claim 1, characterized in that, The number of the second screw is at least three.

7. The limiting fixture as described in claim 6, characterized in that, The second push plate is provided with four second connecting posts extending along the first direction. Each second connecting post is located at one of the four corners of the second push plate. There are four second screws. The position of each second screw abutting against the second push plate corresponds one-to-one with the position of each second connecting post.

8. The limiting fixture as described in claim 2, characterized in that, The first push plate is provided with four first connecting posts extending along the first direction, and each first connecting post is disposed at one of the four corners of the first push plate. The length of the limiting block along the second direction is less than the distance between two first connecting posts that are spaced apart along the second direction.

9. The limiting fixture as described in any one of claims 1 to 8, characterized in that, Both the limiting block and the connecting member are made of aluminum alloy or stainless steel, and the limiting block and the connecting member are fixedly connected by welding.

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