Clamp for preventing hard pressing plate from being mistakenly put and withdrawn

Abstract

The invention discloses a clamp for preventing a hard pressing plate from being mistakenly put and withdrawn, relates to the technical field of hard pressing plate control, and solves the problems that in the prior art, mistakenly put and withdraw of different hard pressing plates cannot be achieved, and deformation is prone to happening, according to the technical scheme, the clamp comprises an elastic piece, a first clamping piece and a second clamping piece arranged opposite to the first clamping piece; a clamping area is formed between the first clamping piece and the second clamping piece, the second clamping piece can move relative to the first clamping piece under the action of external force so as to adjust the size of the clamping area, and the second clamping piece has the trend of keeping moving towards the direction of the first clamping piece under the action of the elastic piece. The first clamping piece and the second clamping piece each comprise a base body, an arc limiting part extending out of the base body and a plane limiting part connected to the axial side of the arc limiting part, and the two ends of the plane limiting part are fixedly connected with the two ends of the arc limiting part correspondingly so that an axial opening in one side of the arc limiting part can be closed. The structure strength is improved while different hard pressing plates are prevented from being put and withdrawn by mistake.

Description

Technical Field

[0001] This invention relates to the field of hard plate control technology, and in particular to a clamp for preventing accidental release or retraction of hard plate. Background Technology

[0002] During the operation and maintenance of substation secondary systems, strict control over the activation and deactivation of the hard-plate relays of relay protection devices is essential to ensure effective isolation between operating and de-energized equipment. The status of the hard-plate directly determines whether the protection function is activated. Accidental activation or deactivation can easily lead to malfunctions or failures to operate, endangering power grid safety. Currently, two types of hard-plate relays are commonly used in the field: one is a rotary hard-plate relay, which achieves on / off switching by rotating a connecting piece around an axis; the other is a pull-out hard-plate relay, which is activated or deactivated by vertically inserting and pulling a flat connecting piece, with its electrical terminals typically featuring square sockets.

[0003] Existing anti-misoperation isolation clamps (such as CN212114760U) typically use elastic arc-shaped buckles to clamp the upper and lower cylindrical terminals of the hard pressure plate to restrict the rotation of the connecting piece, suitable for rotary hard pressure plates. However, this structure is not suitable for pull-type hard pressure plates, which have no exposed cylindrical terminals for clamping, and the arc-shaped inner cavity of the elastic arc-shaped buckle does not fit the flat connecting piece. When used for pull-type hard pressure plates, the arc-shaped buckle alone cannot provide effective limiting. Moreover, the elastic arc-shaped buckle has openings on both sides of the axial direction, and its arc-shaped part has a free end, which is prone to elastic deformation under spring pressure or external force, resulting in loose clamping. More seriously, because the axial direction is not closed, conductive parts can be directly pulled out from the opening in the vertical direction. The elastic arc-shaped buckle cannot prevent the lifting action at all, causing the anti-misoperation function to fail. Summary of the Invention

[0004] The purpose of this invention is to provide a clamp that prevents the accidental ejection of hard pressure plates, which solves the problems of existing technologies that cannot prevent accidental ejection of different hard pressure plates and are prone to deformation. It achieves the goal of preventing accidental ejection of different hard pressure plates while improving structural strength.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a clamp for preventing accidental ejection of a hard pressure plate, comprising an elastic element, a first clamping element, and a second clamping element disposed relative to the first clamping element. A clamping area is formed between the first clamping element and the second clamping element. The second clamping element can move relative to the first clamping element under the action of an external force to adjust the size of the clamping area. The second clamping element has a tendency to move towards the first clamping element under the action of the elastic element. Both the first clamping element and the second clamping element include a base, an arc-shaped limiting portion extending from the base, and a planar limiting portion connected to one axial side of the arc-shaped limiting portion. The two ends of the planar limiting portion are respectively fixedly connected to the two ends of the arc-shaped limiting portion to close one axial opening of the arc-shaped limiting portion.

[0006] After adopting the above technical solution, the present invention has the following advantages: By providing planar limiting parts on the first clamping member and the second clamping member, it can effectively adapt to the anti-misoperation requirements of the rotary hard pressure plate. When used for the rotary hard pressure plate, the arc limiting part clamps its upper and lower cylindrical terminals to restrict the connecting piece from rotating around the axis. At the same time, a planar limiting part is provided connected to one axial side of the arc limiting part, closing one axial opening of the arc limiting part, so that the clamping area forms a semi-closed cavity in the axial direction. When used for the lifting hard pressure plate, this closed structure can effectively limit the flat connecting piece in the axial direction, and the connecting piece cannot be pulled out in the vertical direction. For the above-mentioned rotary hard pressure plate and lifting hard pressure plate, All designs force the disassembly of the clamps before operating the hard pressure plates, thus achieving a foolproof design. As a result, the same clamp can be compatible with two types of hard pressure plates, and can prevent accidental insertion or removal through mechanical constraints in both application scenarios. Secondly, the two ends of the planar limiting part are fixedly connected to the two ends of the arc limiting part, forming a closed or nearly closed cross-sectional frame, which greatly improves the bending stiffness and torsional resistance of the clamping parts, suppresses the radial expansion or axial warping of the arc limiting part under stress as much as possible, ensures the long-term stability of the clamping force, enhances the durability and reliability of the clamp in complex field environments, and avoids the loss of limiting function due to structural fatigue or instantaneous impact as much as possible.

[0007] Furthermore, the inner side of the planar limiting part facing the clamping area is planar.

[0008] By adopting the aforementioned technical solution, since the connecting piece of the lifting hard pressure plate is a flat structure without cylindrical terminals, the traditional arc-shaped limiting part cannot form effective contact and constraint with it. However, the planar inner side can achieve large-area, parallel and symmetrical surface contact with the two sides of the flat connecting piece. Under the clamping force provided by the elastic element, the lifting movement of the connecting piece in the vertical direction is directly restricted by friction. This solves the problem of insufficient clamping and restraint caused by geometric mismatch of the arc structure, and also increases the usage methods of the fixture.

[0009] Furthermore, the two ends of the planar limiting part facing the inner side of the clamping area are flush with the inner side of the arc limiting part facing the clamping area.

[0010] By adopting the aforementioned technical solution, the two ends of the planar limiting part and the arc limiting part form a continuous and coplanar load-bearing interface on the force-bearing side, which avoids stress concentration or local cantilever effect caused by the height difference between the inner surfaces of the two parts as much as possible.

[0011] Furthermore, the inner side of the planar limiting portion facing the clamping area is further away from the clamping area than the inner side of the arc-shaped limiting portion facing the clamping area, so as to form an installation notch between the two.

[0012] With the above technical solution, if the clamp adopts the connection method of setting the planar limiting part inside the cylindrical terminal of the rotary hard pressure plate, the clamp is connected by contacting the cylindrical terminal through the planar limiting part. By setting the installation notch, during the clamping process, the arc limiting part can penetrate into the area where the connecting piece of the rotary hard pressure plate is located, which not only increases the contact area with the connecting piece, but also forms a stronger lateral constraint on both sides, directly restricting its tendency to rotate around the axis. Moreover, the installation notch plays a positioning role for the clamp, making it difficult for the clamped part to detach from the cylindrical terminal.

[0013] Furthermore, the planar limiting part is provided on both sides of the arc limiting part, and the planar limiting part and the arc limiting part together form a limiting groove.

[0014] Using the aforementioned technical solution, the limiting groove forms a circumferential limit on the lifting hard pressure plate, further preventing accidental retraction. The limiting groove structure is also effective for the rotating hard pressure plate: the arc limiting part clamps its cylindrical terminal to restrict rotation, while the two side plane limiting parts respectively fit or approach the upper and lower (or left and right) edges of the connecting piece body to form auxiliary constraints, which prevents the connecting piece from undergoing slight deflection due to vibration, gaps or external forces as much as possible, improves the reliability of preventing accidental retraction, and also improves the bending and torsional stiffness of the clamping part itself.

[0015] Furthermore, the inner side of the arc-shaped limiting portion facing the clamping area is provided with a flexible layer.

[0016] Through the above technical solution, the flexible layer can effectively buffer the rigid contact between the arc-shaped limiting part and the hard pressure plate terminal or connecting piece during the clamping process, and avoid scratches as much as possible. Secondly, under the clamping force applied by the elastic element, the flexible layer can adaptively conform to the surface contour of the cylindrical terminal or connecting piece, thereby improving static friction and enhancing the resistance to rotation or lifting actions, making the limiting more reliable.

[0017] Furthermore, warning labels are provided on the peripheral surface of the substrate.

[0018] The above technical solution visually alerts maintenance personnel that the hard plate is currently in an anti-misoperation isolation state, ensuring that its functional status can be identified in a timely manner when approaching the equipment from different angles. This helps to prevent unauthorized activation or deactivation of the plate due to misjudgment of the equipment status, strengthens the safety barrier from an ergonomics perspective, and reduces the risk of human error.

[0019] Furthermore, the substrate, the arc-shaped limiting part, and the planar limiting part are integrally injection molded structures.

[0020] The above technical solutions further enhance structural strength.

[0021] Furthermore, the first clamping member and the second clamping member are provided with a connecting rod connecting the two bases. The first clamping member is provided with a sliding cavity. One end of the connecting rod is fixedly connected to the second clamping member, and the other end extends into the sliding cavity and slides in cooperation with the sliding cavity. The other end of the connecting rod is provided with a limiting protrusion to prevent the connecting rod from disengaging from the sliding cavity. The elastic element is sleeved on the connecting rod and disposed in the sliding cavity.

[0022] The above technical solution enables the first clamping member to move relative to the second clamping member, thereby changing the size of the clamping area.

[0023] Furthermore, the base is provided with a communication port connecting the sliding cavity to the outside, the connecting rod is provided with a first actuating part extending out of the communication port, the second clamping member is provided with a second actuating part, and the first actuating part and the second actuating part are arranged opposite to each other.

[0024] The above technical solution provides the operator with symmetrical, intuitive, and ergonomically designed force application points through the opposite arrangement of the two actuating parts. When installing or removing the clamp, maintenance personnel can simultaneously pinch the first and second actuating parts with the thumb and forefinger of one hand (or both hands) and pull outwards to overcome the elastic force of the elastic element, causing the first and second clamping parts to open synchronously. This operation is labor-saving, stable, and less prone to slippage. Attached Figure Description

[0025] The present invention will be further described below with reference to the accompanying drawings:

[0026] Figure 1 This is a schematic diagram of the anti-misplacement clamping device for the hard pressure plate of the present invention;

[0027] Figure 2 This is a cross-sectional view of the anti-misplacement clamp for the hard pressure plate of the present invention;

[0028] Figure 3 This is a schematic diagram of another state of the anti-misplacement clamping device for the hard pressure plate of the present invention;

[0029] Figure 4 This is a schematic diagram of the anti-misplacement clamp of the present invention when facing a rotary hard plate;

[0030] Figure 5 This is a schematic diagram of the anti-misplacement clamp of the present invention when facing the lifting hard pressure plate;

[0031] In the figure, 10 is the first clamping member; 11 is the second clamping member; 101 is the base; 102 is the arc-shaped limiting part; 103 is the planar limiting part; 104 is the inner side; 105 is the warning sign; 106 is the sliding cavity; 107 is the connecting port; 12 is the elastic element; 13 is the clamping area; 14 is the connecting rod; 15 is the first actuating part; 16 is the second actuating part; 20 is the rotary hard pressure plate; 21 is the connecting piece; 22 is the upper cylindrical terminal; 23 is the lower cylindrical terminal; 30 is the lifting hard pressure plate; 31 is the fixed part; and 32 is the movable part. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0033] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein.

[0034] It should be understood that in the various embodiments of the present invention, the number of each process does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0035] It should be understood that in this invention, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0036] It should be understood that in this invention, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, or Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Contains X, Y, and Z", "Contains X, Y, and Z" means that all three X, Y, and Z are contained; "Contains X, Y, or Z" means that one of X, Y, and Z is contained; "Contains X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are contained.

[0037] The technical solution of the present invention will be described in detail below with reference to specific embodiments. The following specific embodiments may be combined or substituted with each other according to the actual situation, and the same or similar concepts or processes may not be described again in some embodiments.

[0038] like Figures 1 to 5 As shown, the present invention provides a clamp for preventing the accidental ejection of a hard pressure plate, including an elastic member 12, a first clamping member 10, and a second clamping member 11 disposed relative to the first clamping member 10. A clamping area 13 is formed between the first clamping member 10 and the second clamping member 11. The second clamping member 11 can move relative to the first clamping member 10 under the action of an external force to adjust the size of the clamping area 13. The second clamping member 11 has a tendency to move towards the first clamping member 10 under the action of the elastic member 12. Both the first clamping member 10 and the second clamping member 11 include a base 101, an arcuate limiting part 102 extending from the base 101, and a planar limiting part 103 connected to one axial side of the arcuate limiting part 102. The two ends of the planar limiting part 103 are fixedly connected to the two ends of the arcuate limiting part 102 to close the axial opening on one side of the arcuate limiting part 102.

[0039] By providing planar limiting portions 103 on the first clamping member 10 and the second clamping member 11, it can effectively adapt to the anti-misoperation requirements of the rotary hard plate 20. When used on the rotary hard plate 20, the arc limiting portion 102 clamps its upper and lower cylindrical terminals to restrict the connecting piece 21 from rotating around the axis. At the same time, a planar limiting portion 103 is provided connected to one axial side of the arc limiting portion 102 to close the axial opening on one side of the arc limiting portion 102, so that the clamping area 13 forms a semi-closed cavity in the axial direction. When used on the lifting hard plate 30, this closed structure can effectively limit the axial direction of the flat connecting piece 21, and the connecting piece 21 cannot be pulled out in the vertical direction. For the above-mentioned rotary hard plate 20 and lifting hard plate 30, this structure can effectively limit the axial direction of the flat connecting piece 21, and the connecting piece 21 cannot be pulled out in the vertical direction. All pressure plates 30 are forced to form an operation logic of first disassembling the clamp and then operating the hard pressure plate, realizing a foolproof design. Thus, the same clamp can be compatible with two types of hard pressure plates, and can prevent accidental insertion or removal through mechanical constraints in both application scenarios. Secondly, the two ends of the planar limiting part 103 are fixedly connected to the two ends of the arc limiting part 102, forming a closed or nearly closed cross-sectional frame, which greatly improves the bending stiffness and torsional resistance of the clamping parts, suppresses the radial expansion or axial warping of the arc limiting part 102 under stress as much as possible, ensures the long-term stability of the clamping force, enhances the durability and reliability of the clamp in complex field environments, and avoids the loss of limiting function due to structural fatigue or instantaneous impact as much as possible.

[0040] The inner surface 104 of the arc-shaped limiting part 102 facing the clamping area 13 is provided with a flexible layer. The flexible layer can effectively buffer the rigid contact between the arc-shaped limiting part 102 and the hard pressure plate terminal or connecting piece 21 during clamping, avoiding scratches as much as possible. Secondly, under the clamping force applied by the elastic member 12, the flexible layer can adaptively conform to the surface contour of the cylindrical terminal or connecting piece 21, thereby increasing static friction and enhancing the resistance to rotation or lifting actions, making the limiting more reliable. The flexible part can be made of flexible materials such as silicone or sponge.

[0041] To further prevent misoperation, warning signs 105 are provided on the peripheral surface of the base 101. These signs visually indicate to maintenance personnel that the hard plate is currently in an anti-misoperation isolation state, ensuring that its functional status can be promptly identified when approaching the equipment from different angles. This minimizes the risk of unauthorized activation or deactivation of the plate due to misjudgment of the equipment's status, strengthening the safety barrier from an ergonomics perspective and reducing the risk of human error. The warning signs 105 can be text, images, or other formats.

[0042] To achieve the change in the size of the clamping area 13 by moving the first clamping member 10 relative to the second clamping member 11, the first clamping member 10 and the second clamping member 11 are provided with a connecting rod 14 of the base 101 connecting the two. The first clamping member 10 is provided with a sliding cavity 106. One end of the connecting rod 14 is fixedly connected to the second clamping member 11, and the other end extends into the sliding cavity 106 and slides in cooperation with the sliding cavity 106. The other end of the connecting rod 14 is provided with a limiting protrusion to prevent the connecting rod 14 from disengaging from the sliding cavity 106. An elastic member 12 is sleeved on the connecting rod 14 and is provided in the sliding cavity 106.

[0043] To facilitate adjustment of the size of the clamping area 13, the base 101 has a communication port 107 connecting the sliding cavity 106 to the outside. The connecting rod 14 has a first actuating part 15 extending through the communication port 107, and the first clamping member 10 has a second actuating part 16, with the first actuating part 15 and the second actuating part 16 arranged opposite to each other. The opposite arrangement of the two actuating parts provides the operator with symmetrical, intuitive, and ergonomic force application points. When installing or removing the clamp, the maintenance personnel can use the thumb and forefinger of one hand (or both hands) to simultaneously pinch the first actuating part 15 and the second actuating part 16 and pull outwards to overcome the elastic force of the elastic member 12, so that the first clamping member 10 and the second clamping member 11 open synchronously, making the operation labor-saving, stable, and less prone to slippage.

[0044] Furthermore, the outer surfaces of the first actuating part 15 and the second actuating part 16 may be provided with anti-slip textures and integrally formed with a material that is the same as or has a higher hardness than the base 101 to ensure that no breakage, deformation or wear occurs during repeated actuation operations; at the same time, the distance between the first actuating part 15 and the second actuating part 16 in the naturally closed state of the clamp should be less than the minimum effective pinch width of a human finger to avoid accidental opening as much as possible, and after applying a predetermined opening force, it can smoothly and synchronously drive the first clamping member 10 and the second clamping member 11 to separate, thereby realizing reliable adjustment of the size of the clamping area 13.

[0045] To further enhance structural strength, the base 101, the arc-shaped limiting part 102, and the planar limiting part 103 are integrally injection molded structures. The planar limiting part 103 may be provided with an installation port to facilitate the insertion of the elastic element 12 and the connecting rod 14 into the sliding cavity 106.

[0046] Since the connecting piece 21 of the lifting hard pressure plate 30 is a flat structure without cylindrical terminals, the traditional arc-shaped limiting part 102 cannot form effective contact and constraint with it. Therefore, in this application, the inner side 104 of the planar limiting part 103 facing the clamping area 13 is planar. The planar shape can be a straight line. The planar inner side 104 can achieve large-area, parallel and symmetrical surface contact with the two side planes of the flat connecting piece 21. Under the clamping force provided by the elastic element 12, the lifting movement of the connecting piece 21 in the vertical direction is directly restricted by the friction force, which solves the problem of insufficient clamping and restriction caused by the geometric mismatch of the arc structure, and also increases the usage of the clamp.

[0047] It should be noted that the elastic element 12 can be a spring.

[0048] Furthermore, the two ends of the inner surface 104 of the planar limiting part 103 facing the clamping area 13 are flush with the inner surface 104 of the arc limiting part 102 facing the clamping area 13. This makes the two ends of the planar limiting part 103 and the arc limiting part 102 form a continuous and coplanar bearing interface on the force-bearing side, thereby minimizing stress concentration or local cantilever effect caused by the height difference between their inner surfaces 104.

[0049] The first method of use: When facing the rotary hard pressure plate 20, the rotary hard pressure plate 20 includes a connecting piece 21, an upper cylindrical terminal 22 and a lower cylindrical terminal 23. One end of the connecting piece 21 is connected to the lower cylindrical terminal 23. Rotating the connecting piece 21 makes it connect to the upper cylindrical terminal 22 at the same time. At this time, the first clamping member 10 is connected to the lower cylindrical terminal 23 first. The planar limiting part 103 is close to the operator's side and will not contact the axial surface of the lower cylindrical terminal 23. The lower cylindrical terminal 23 is clamped by the arc limiting part 102. Then, the first actuating part 15 and the second actuating part 16 are moved to make the second clamping member 11 move away from the first clamping member 10 so that the arc limiting part 102 of the second clamping member 11 is sufficient to surround and clamp the connecting piece 21. At this time, under the action of the elastic member 12, the second clamping member 11 moves closer to the first clamping member 10 and clamps the connecting piece 21 for isolation. The connecting piece 21 cannot be withdrawn. When the connecting piece 21 needs to be removed from the upper cylindrical terminal 22, the first actuating part 15 and the second actuating part 16 must be moved first to move the second clamping member 11 away from the first clamping member 10, and the arc-shaped limiting part 102 away from the connecting piece 21, so that the connecting piece 21 can be removed from the upper cylindrical terminal 22. After releasing the first actuating part 15 and the second actuating part 16, the arc-shaped limiting part 102 directly clamps the upper cylindrical terminal 22. At this time, the connecting piece 21 cannot be directly installed onto the upper cylindrical terminal 22. The first actuating part 15 and the second actuating part 16 must be moved first to move the second clamping member 11 away from the first clamping member 10 to prevent incorrect installation.

[0050] When facing the pull-up hard pressure plate 30, for easy distinction, the pull-up hard pressure plate 30 includes a fixed part 31 and a movable part 32. The movable part 32 is the connecting piece 21. The movable part 32 is first inserted into the fixed part 31. Then, the first actuating part 15 and the second actuating part 16 are moved to move the second clamping member 11 away from the first clamping member 10, so that the arc-shaped limiting part 102 of the second clamping member 11 is sufficient to surround and clamp the movable part 32 and the fixed part 31. The planar limiting part 103 is closer to the operator's side, that is, located on the outside of the movable part 32. After releasing the first actuating part 15 and the second actuating part 16, the arc-shaped limiting part 102 clamps both sides of the fixed part 31. At this time, the movable part 32 is limited by the planar limiting part 103 and cannot be withdrawn. When the movable part 32 needs to be detached from the fixed part 31, the first actuating part 15 and the second actuating part 16 must be moved first to move the planar limiting part 103 away from the movable part 32 before the movable part 32 can be pulled out. After releasing the first actuating part 15 and the second actuating part 16, the arc-shaped limiting part 102 directly clamps the fixed part 31. At this time, the movable part 32 is limited by the planar limiting part 103 and cannot be directly installed onto the fixed part 31. The first actuating part 15 and the second actuating part 16 must be moved first to prevent incorrect installation.

[0051] The second method of use: The steps for facing the rotary hard pressure plate 20 and the lifting hard pressure plate 30 are the same as the first method, except that the installation direction of the clamp is different. The planar limiting part 103 is on the side away from the operator. When facing the rotary hard pressure plate 20, the planar limiting part 103 is directly clamped on the upper cylindrical terminal 22. When facing the lifting hard pressure plate 30, the planar limiting part 103 is directly clamped on the movable part 32. It can adapt to the shape of the movable part 32 to form a reliable clamping.

[0052] Understandably, in other embodiments, if the clamp uses a connection method where the planar limiting part is located inside the cylindrical terminal of the rotary hard pressure plate, the clamp is connected by contact between the planar limiting part and the cylindrical terminal. The inner side of the planar limiting part facing the clamping area is further away from the clamping area than the inner side of the arc-shaped limiting part facing the clamping area, so as to form an installation notch between the two. During the clamping process, the arc-shaped limiting part can penetrate into the area where the connecting piece of the rotary hard pressure plate is located, which not only increases the contact area with the connecting piece, but also forms a stronger lateral constraint on both sides, directly restricting its tendency to rotate around the axis. Moreover, the installation notch plays a positioning role for the clamp, making it difficult for the clamped part to detach from the cylindrical terminal.

[0053] Understandably, in other embodiments, planar limiting portions are provided on both sides of the arc-shaped limiting portion, and the planar limiting portions and the arc-shaped limiting portions together form a limiting groove. The limiting groove provides circumferential limiting for the pull-type hard pressure plate, further preventing accidental retraction. The limiting groove structure is also effective for the rotary hard pressure plate: the arc-shaped limiting portion clamps its cylindrical terminal to restrict rotation, while the planar limiting portions on both sides respectively fit against or approach the upper and lower (or left and right) edges of the connecting piece body to form auxiliary constraints, preventing the connecting piece from undergoing slight deflection due to vibration, gaps, or external forces as much as possible, improving the reliability of preventing accidental retraction, and also improving the bending and torsional stiffness of the clamping component itself.

[0054] In addition to the preferred embodiments described above, the present invention has other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection claimed by the present invention.

Claims

1. A hardboard misinsertion prevention ejection clamp, comprising an elastic member, a first clamping member, and a second clamping member arranged opposite to the first clamping member, a clamping area being formed between the first clamping member and the second clamping member, the second clamping member being movable relative to the first clamping member to adjust the size of the clamping area under the action of an external force, the second clamping member having a tendency to move toward the first clamping member under the action of the elastic member, characterized in that, The first clamping member and the second clamping member each comprise a base, an arc limiting portion extending from the base, and a planar limiting portion connected to an axial side of the arc limiting portion, two ends of the planar limiting portion being fixedly connected with two ends of the arc limiting portion respectively to close an axial opening of one side of the arc limiting portion.

2. The anti-jamming pressboard ejection fixture of claim 1, wherein, An inner side of the planar limiting portion facing the clamping area is planar.

3. The hard-press board misfeed ejection jig according to claim 1 or 2, characterized by, Two ends of the inner side of the planar limiting portion facing the clamping area are flush with the inner side of the arc limiting portion facing the clamping area.

4. The hard-press board misfeed ejection jig according to claim 1 or 2, characterized by The inner side of the planar limiting portion facing the clamping area is farther away from the clamping area than the inner side of the arc limiting portion facing the clamping area, so as to form a mounting gap therebetween.

5. The hard press board misfeed ejection fixture of claim 1, wherein, Both axial sides of the arc limiting portion are provided with the planar limiting portion, and the planar limiting portion and the arc limiting portion form a limiting groove.

6. The hard press board misfeed ejection fixture of claim 1, wherein, The inner side of the arc limiting portion facing the clamping area is provided with a flexible layer.

7. The anti-jamming backboard ejection fixture of claim 1, wherein, A warning mark is arranged on a circumferential surface of the base.

8. The anti-jamming ejection fixture of claim 1, wherein, The base, the arc limiting portion, and the planar limiting portion are integrally injection molded.

9. The anti-jamming ejection fixture of claim 1, wherein, The first clamping member and the second clamping member are provided with a connecting rod connecting the base, the first clamping member is provided with a sliding cavity, one end of the connecting rod is fixedly connected with the second clamping member, the other end of the connecting rod extends into the sliding cavity and is in sliding fit with the sliding cavity, the other end of the connecting rod is provided with a limiting protrusion to prevent the connecting rod from being separated from the sliding cavity, and an elastic member is sleeved on the connecting rod and arranged in the sliding cavity.

10. The anti-jamming pressboard ejection fixture of claim 9, wherein, The base is provided with a communication port communicating the sliding cavity with the outside, the connecting rod is provided with a first actuating portion penetrating through the communication port, the second clamping member is provided with a second actuating portion, and the first actuating portion and the second actuating portion are arranged oppositely.

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