Duplex pressing plate assembly

By designing staggered pressure plates and bases in the double-plate assembly and adding fixing components, the problem of malfunction caused by external force or vibration in the prior art is solved, ensuring the safe operation of the power system.

CN121282736APending Publication Date: 2026-01-06GUANGDONG POWER GRID CO LTD DONGGUAN POWER SUPPLY BUREAU
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Patent Information

Application Number
CN202511669222.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-11-13
Publication Date
2026-01-06

AI Technical Summary

Technical Problem

The existing double pressure plate is prone to returning to the engaged state when it is in the disengaged state due to external force or vibration, which may cause the safety device to malfunction and lead to power system failure or safety accident.

Method used

A double-plate assembly was designed, including a plate, a base, and a fixing component. By setting multiple mounting parts and connecting parts on the base, the plate and the base are staggered, and the fixing component is added to limit the relative position of the plate and the base, so as to avoid malfunction caused by external force or vibration.

Benefits of technology

This effectively prevents the pressure plate from malfunctioning due to external force or vibration, ensuring the safe operation of the power system.

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Abstract

The invention provides a duplex pressing plate assembly, and relates to the technical field of power systems, and the duplex pressing plate assembly comprises a pressing plate, a pedestal, and a fixing member. The base is provided with a plurality of mounting parts; the fixing piece is arranged at one end of the base in the first direction and provided with a connecting part, and the connecting part extends out of the base in the first direction; the pressing plate is connected with the base through at least part of the mounting portion, the pressing plate and the base are arranged in a staggered mode, and the corners of the pressing plate are inserted into the connecting portions. According to the duplex pressing plate assembly, the relative position of the pressing plate and the base can be limited in a physical mode, and pressing plate maloperation caused by external force touch or vibration is avoided.
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Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power systems, and in particular to a double pressure plate assembly. BACKGROUND

[0002] With the continuous development of power systems, the safe operation of power systems is particularly important; the relay protection and safety automatic device (referred to as the safety automatic device) as a key equipment in the power system, which can provide protection for the safe operation of the power system; the safety automatic device is provided with a double pressure plate, which is used to switch the on and off states of the control loop and signal loop in the safety automatic device, and is the bridge and hub of the safety automatic device connecting the external or internal wiring.

[0003] The existing double pressure plate is composed of a pressure plate and a pressure plate base, the pressure plate is provided with a plug-in column, and the pressure plate base is provided with a plug-in hole matched with the plug-in column; when the double pressure plate is in the put-in state, i.e. the plug-in column is inserted into the plug-in hole, the control loop and the signal loop in the safety automatic device are connected at the same time; when the double pressure plate is in the exit state, i.e. the plug-in column is separated from the plug-in hole, the above two loops are disconnected at the same time.

[0004] However, when the above-mentioned double pressure plate is in the exit state, it is easy to return to the put-in state due to external force touch or vibration, which leads to the misoperation of the safety automatic device and causes the failure of the power system or even safety accidents. SUMMARY

[0005] Therefore, the present application provides a double pressure plate assembly, which can limit the relative position of the pressure plate and the base by physical means to avoid the misoperation of the pressure plate caused by external force touch or vibration.

[0006] To achieve the above-mentioned purpose, the present application adopts the following technical solutions:

[0007] The present application provides a double pressure plate assembly, which comprises a pressure plate, a base and a fixing member;

[0008] The base is provided with a plurality of mounting portions;

[0009] The fixing member is arranged at one end of the base along a first direction, and the fixing member is provided with a connecting portion which extends out of the base along the first direction;

[0010] The pressure plate is connected to the base through at least part of the mounting portions, the pressure plate and the base are arranged in a staggered manner, and the corners of the pressure plate are inserted into the connecting portion.

[0011] In one possible implementation, the plurality of mounting portions comprises a plurality of first mounting portions and a plurality of second mounting portions;

[0012] The base is a square base, the first mounting portions are arranged in a square shape, and the arrangement direction of the first mounting portions is parallel to the edges of the square base.

[0013] The second mounting portions are arranged in a square shape, and the arrangement direction of the second mounting portions forms an angle with the edges of the square base.

[0014] In a possible implementation, the pressing plate is a square pressing plate, the square pressing plate is connected to the base through the second mounting portions, and the edges of the square pressing plate form an angle with the edges of the square base.

[0015] In a possible implementation, the fixing member is provided with a shielding portion, and the shielding portion covers the first mounting portions.

[0016] In a possible implementation, the first mounting portions are arranged in two rows.

[0017] The number of the shielding portions is two, the two shielding portions are arranged correspondingly to the two rows of first mounting portions, and the shielding portions shield the corresponding first mounting portions.

[0018] In a possible implementation, the base is provided with a clearance slot, and the first mounting portions are located in the clearance slot.

[0019] At least part of the shielding portion is arranged in the clearance slot, and the shielding portion corresponds to the first mounting portion.

[0020] In a possible implementation, the mounting portion is a mounting hole.

[0021] The pressing plate is provided with a plurality of plug-in portions, and the plug-in portions are inserted into the mounting holes.

[0022] In a possible implementation, the connecting portion is provided with a connecting slot, the connecting slot faces the inner side of the base, and the edge of the pressing plate is inserted into the connecting slot.

[0023] In a possible implementation, the connecting slot is provided with an indicating member, and the indicating member is movably arranged in the connecting slot.

[0024] The edge of the pressing plate can drive the indicating member to move relative to the connecting slot, the indicating member is in a first position when the edge of the pressing plate is inserted into the connecting slot, and the indicating member is in a second position when the edge of the pressing plate is not inserted into the connecting slot.

[0025] In a possible implementation, the connecting portion is provided with an indicating port, and the indicating port communicates with the connecting slot.

[0026] The indicating member can be exposed through the indicating opening for displaying the position of the indicating member.

[0027] The duplex presser plate assembly provided by the embodiment of the application comprises a presser plate, a base and a fixing member, the base is provided with a plurality of mounting portions, the fixing member is arranged at one end of the base along a first direction, the fixing member is provided with a connecting portion, the connecting portion extends out of the base along the first direction, the presser plate is connected to the base through at least part of the mounting portions, the presser plate is arranged in a staggered manner with the base, and a corner of the presser plate is inserted into the connecting portion.

[0028] The base is provided with a plurality of mounting portions, and the presser plate can be connected to the base through at least part of the mounting portions, at this time, the presser plate and the base are arranged in a staggered manner and have a certain included angle therebetween; in order to avoid the presser plate from being misoperated due to external force touching or vibration, the fixing member is additionally arranged on the base, and the fixing member is provided with the connecting portion extending out of the base and being inserted into the corner of the presser plate, so as to fix the relative position of the presser plate and the base.

[0029] Compared with the duplex presser plate in the prior art, the duplex presser plate assembly provided by the application can limit the relative position of the presser plate and the base through a physical way, and avoid the misoperation of the presser plate due to external force touching or vibration. BRIEF DESCRIPTION OF DRAWINGS

[0030] The specific embodiments of the application are described in detail below with reference to the accompanying drawings, and it should be understood that the specific embodiments described herein are only used to illustrate and explain the application, and the application is not limited to the following specific embodiments.

[0031] Figure 1 The assembly schematic view of the duplex presser plate assembly provided by the embodiment of the application is shown in FIG. 1;

[0032] Figure 2 The structure schematic view of the fixing member in FIG. 1 is shown in FIG. 2; Figure 1

[0033] The structure schematic view of the presser plate in FIG. 1 is shown in FIG. 3; Figure 3 Figure 1 The structure schematic view of the base in FIG. 1 is shown in FIG. 4.

[0034] Figure 4 Figure 1

[0035] Explanation of reference signs:

[0036] 100-presser plate;

[0037] 110-inserting portion;

[0038] 200-base;

[0039] 210-mounting portion; ​​​

[0040] 211 - first mounting portion; 212 - second mounting portion;

[0041] 220 - displacement slot;

[0042] 300 - fixing member;

[0043] 310 - connecting portion;

[0044] 311 - connecting slot;

[0045] 320 - shielding portion;

[0046] 400 - indicating member;

[0047] 500 - indicating opening.

[0048] The specific embodiments of the present application have been shown by the above drawings, and will be described in more detail hereinafter. These drawings and the written description are not intended to restrict the scope of the embodiments of the present application in any way, but to illustrate the concepts of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0049] In order to make the purposes, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application and how the technical solutions in the embodiments of the present application solve the above technical problems will be clearly and completely described hereinafter by specific embodiments and in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0050] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connecting” should be understood in a broad sense, for example, can be fixed connection, can be indirectly connected through an intermediate medium, can be the communication inside two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0051] In the description of the embodiments of the present application, it should be understood that the terms “up”, “down”, “front”, “back”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments of the present application and simplify the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0052] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application 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 the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein.

[0053] In this application, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0054] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion, such that a process, method, system, product, or apparatus 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 apparatus.

[0055] With the continuous development of power systems, the safe operation of power systems has become particularly important. Relay protection and automatic safety devices (hereinafter referred to as safety devices) are key equipment in power systems, which can provide protection for the safe operation of power systems. The safety devices are equipped with double pressure plates, which are used to switch the conduction and disconnection states of the control circuit and signal circuit within the safety device. They are the bridge and hub connecting the safety devices to external or internal wiring.

[0056] The existing double pressure plate consists of a pressure plate and a pressure plate base. The pressure plate is provided with a plug-in post, and the pressure plate base is provided with a plug-in hole that matches the plug-in post. When the double pressure plate is in the engaged state, that is, when the plug-in post is inserted into the plug-in hole, the control circuit and signal circuit in the safety device are connected simultaneously. When the double pressure plate is in the disengaged state, that is, when the plug-in post is disengaged from the plug-in hole, the above two circuits are disconnected simultaneously.

[0057] However, when the aforementioned double pressure plate is in the disengaged state, it is easily returned to the engaged state by external force or vibration, which may cause the safety device to malfunction, leading to power system failure or even safety accidents.

[0058] Based on this, the present application provides a double pressure plate assembly, including a pressure plate, a base and a fixing member, wherein the base is provided with a plurality of mounting parts, the fixing member is provided at one end of the base along a first direction, the fixing member is provided with a connecting part, the connecting part extends out of the base along the first direction, the pressure plate is connected to the base through at least part of the mounting parts, the pressure plate and the base are offset, and the corner of the pressure plate is inserted into the connecting part.

[0059] The base is provided with multiple mounting parts, and the pressure plate can be connected to the base through at least part of the mounting parts. At this time, the pressure plate and the base are misaligned. In order to prevent the pressure plate from moving accidentally due to external force or vibration, a fixing member is added. The fixing member is provided on the base, and the fixing member is provided with a connecting part that extends out of the base and is inserted into the corner of the pressure plate to fix the relative position of the pressure plate and the base.

[0060] Compared to the double pressure plates in the prior art, the double pressure plate assembly provided in this application can physically restrict the relative position of the pressure plate and the base, avoiding accidental movement of the pressure plate due to external force or vibration.

[0061] The technical solutions of the embodiments of this application will be described in detail below with reference to the accompanying drawings and specific examples. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments.

[0062] Reference Figures 1 to 4 As shown, this application embodiment provides a double pressure plate assembly, including a pressure plate 100, a base 200, and a fixing member 300; the base 200 is provided with a plurality of mounting portions 210; the fixing member 300 is disposed on the base 200 along a first direction (refer to...). Figure 1 At one end of the base 200 (in the X direction), the fastener 300 is provided with a connecting part 310, which extends out of the base 200 in the first direction.

[0063] In practice, the fastener 300 is fixed to one end of the base 200 along the first direction to ensure the stability of the connection between the fastener 300 and the base 200. Of course, the connection between the fastener 300 and the base 200 can be adhesive or bolted. The specific connection method can be selected by the staff according to the actual needs, which will not be elaborated here.

[0064] The pressure plate 100 is connected to the base 200 via at least part of the mounting portion 210. The pressure plate 100 and the base 200 are offset from each other, and the corner of the pressure plate 100 is inserted into the connecting portion 310.

[0065] The base 200 is provided with multiple mounting parts 210, and the pressure plate 100 can be connected to the base 200 through at least part of the mounting parts 210. At this time, the pressure plate 100 and the base 200 are offset and have a certain angle between them. In order to prevent the pressure plate 100 from moving accidentally due to external force or vibration, a fixing member 300 is added. The fixing member 300 is provided on the base 200, and the fixing member 300 is provided with a connecting part 310 that extends out of the base 200 and is inserted into the corner of the pressure plate 100, so as to fix the relative position of the pressure plate 100 and the base 200.

[0066] Compared to the double pressure plates in the prior art, the double pressure plate assembly provided in this application can physically restrict the relative position of the pressure plate 100 and the base 200, thus preventing the pressure plate 100 from moving accidentally due to external force or vibration.

[0067] Reference Figure 1 and Figure 4 As shown, in some embodiments, the plurality of mounting portions 210 include a plurality of first mounting portions 211 and a plurality of second mounting portions 212; the base 200 is configured as a square base, the plurality of first mounting portions 211 are arranged in a square, and the arrangement direction of the plurality of first mounting portions 211 is parallel to the edge of the square base; the plurality of second mounting portions 212 are arranged in a square, and the arrangement direction of the plurality of second mounting portions 212 forms an angle with the edge of the square base.

[0068] Furthermore, in some embodiments, the pressure plate 100 is configured as a square pressure plate, which is connected to the base 200 through a plurality of second mounting parts 212, and the edge of the square pressure plate forms an angle with the edge of the square base.

[0069] In a specific implementation, when the pressure plate 100 is connected to the base 200 through multiple second mounting parts 212, the edge of the pressure plate 100 forms an angle with the edge of the base 200, and the double pressure plate assembly is in the disengaged state; when the pressure plate 100 is connected to the base 200 through multiple first mounting parts 211, the edge of the pressure plate 100 is parallel and aligned with the edge of the base 200, and the double pressure plate assembly is in the engaged state.

[0070] Specifically, the number of the first mounting part 211 and the second mounting part 212 is set to 4; of course, the number of the first mounting part 211 and the second mounting part 212 can be set to 3 or even less, or 5 or even more, which will not be elaborated here.

[0071] Reference Figure 1 , Figure 2 and Figure 4 As shown, in some embodiments, the fastener 300 is provided with a shielding portion 320, which covers a plurality of first mounting portions 211.

[0072] Furthermore, in some embodiments, a plurality of first mounting portions 211 are arranged in two columns; there are two blocking portions 320, which are correspondingly arranged with the two columns of first mounting portions 211, and the blocking portions 320 block the corresponding first mounting portions 211.

[0073] In practical implementation, when the double pressure plate assembly is in the engaged state, that is, the pressure plate 100 is connected to the base 200 through multiple first mounting parts 211, the edge of the pressure plate 100 is parallel and aligned with the edge of the base 200; when the double pressure plate assembly is switched to the disengaged state, the pressure plate 100 is simply disengaged from the first mounting parts 211 and connected to the base 200 through multiple second mounting parts 212, at which point the edge of the pressure plate 100 forms an angle with the edge of the base 200.

[0074] Meanwhile, to prevent the double-plate assembly from returning to the engaged state due to external force or vibration, after the plate 100 is connected to the base 200 through multiple second mounting parts 212, the fixing part 300 is installed on the base 200 until the shielding part 320 provided on the fixing part 300 completely covers all the first mounting parts 211 on the base 200; in this way, when the double-plate assembly has a tendency to return to the engaged state, it will be interfered with by the shielding part 320 and will not be able to cooperate with the first mounting parts 211, thus ensuring the safe operation of the power system.

[0075] Specifically, multiple first mounting parts 211 are arranged in two rows, and there are two blocking parts 320. The two blocking parts 320 are corresponding to the two rows of first mounting parts 211, and the blocking parts 320 block the corresponding first mounting parts 211. Of course, in this application, there are no restrictions on the specific arrangement of the first mounting parts 211 and the number of blocking parts 320, as long as the blocking parts 320 completely block the first mounting parts 211. This will not be described in detail here.

[0076] Reference Figure 1 and Figure 4 As shown, in some embodiments, the base 200 is provided with a relief groove 220, and the first mounting part 211 is located in the relief groove 220; at least a portion of the blocking part 320 is provided in the relief groove 220, and the blocking part 320 corresponds to the first mounting part 211.

[0077] Since the shielding part 320 itself has a certain height, when the shielding part 320 covers multiple first mounting parts 211, it will increase the gap between the pressure plate 100 and the base 200, affecting the connection strength between the pressure plate 100 and the base 200 through multiple second mounting parts 212; therefore, in the above embodiment, a clearance groove 220 is added to the base 200, wherein the shape of the clearance groove 220 is adapted to the outer contour of the shielding part 320, so as to provide installation space for the shielding part 320.

[0078] Reference Figure 1 , Figure 3 and Figure 4 As shown, in some embodiments, the mounting portion 210 is configured as a mounting hole; the pressure plate 100 is provided with a plurality of insertion portions 110, which are inserted into the mounting hole.

[0079] In specific implementation, both the first mounting part 211 and the second mounting part 212 are configured as mounting holes, and the plug-in part 110 is configured as a plug-in post adapted to the mounting hole. When the double pressure plate assembly switches states, it is only necessary to plug the plug-in post into different mounting holes. Thus, by setting mounting holes and plug-in posts, it is not only convenient to assemble the pressure plate 100 and the base 200, but also to form a reliable connection between the pressure plate 100 and the base 200, ensuring the safe operation of the power system.

[0080] Reference Figure 1 and Figure 2 As shown, in some embodiments, the connecting part 310 is provided with a connecting groove 311, which faces the inside of the base 200; the corner of the pressure plate 100 is inserted into the connecting groove 311.

[0081] Furthermore, in some embodiments, an indicator 400 is provided in the connecting groove 311, and the indicator 400 is movably disposed in the connecting groove 311; the corner of the pressure plate 100 can push the indicator 400 to move relative to the connecting groove 311. When the corner of the pressure plate 100 is inserted into the connecting groove 311, the indicator 400 is in a first position; when the corner of the pressure plate 100 is not inserted into the connecting groove 311, the indicator 400 is in a second position.

[0082] In practical implementation, an indicator 400 is added. The indicator 400 can display the connection status between the pressure plate 100 and the fixing member 300 to the operator in real time, that is, whether the corners of the pressure plate 100 are fully inserted into the connecting groove 311, and whether the pressure plate 100 is completely disengaged from the connecting groove 311. This avoids the risk of the pressure plate 100 accidentally falling off during the use of the double pressure plate assembly if the corners of the pressure plate 100 are not fully inserted into the connecting groove 311; and avoids the risk of damage to the pressure plate 100 and the fixing member 300 if a pulling force is applied to the pressure plate 100 before it is completely disengaged from the connecting groove 311.

[0083] Furthermore, in some embodiments, the connecting portion 310 is provided with an indicator port 500, which communicates with the connecting groove 311; the indicator 400 can be exposed through the indicator port 500 to display the position of the indicator 400.

[0084] In a specific implementation, an elastic element is provided between the indicator 400 and the connecting groove 311. The elastic element can be a spring. The top of the indicator 400 is provided with a first color block and a second color block. The first color block and the second color block can be blue and red, or other colors, as long as the colors of the first color block and the second color block are different. This will not be elaborated on here.

[0085] When the corner of the pressure plate 100 is along the second direction (refer to...) Figure 1 When the double pressure plate assembly is in the retracted state, the pressure plate 100 pushes the indicator 400 to move from the second position to the first position along the second direction, and compresses the elastic element between the indicator 400 and the connecting groove 311. At this time, after being subjected to the elastic force from the elastic element, the indicator 400 has a tendency to move from the first position back to the second position. The first color block on the top of the indicator 400 will be exposed through the indicator opening 500 to indicate that the pressure plate 100 has been fully inserted into the connecting groove 311. When the pressure plate 100 is disengaged from the connecting groove 311, the indicator 400 returns to the second position, and the second color block on the top of the indicator 400 will be exposed through the indicator opening 500 to indicate that the pressure plate 100 has been fully disengaged from the connecting groove 311.

[0086] It should be understood that the various forms of processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the embodiments of this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in the embodiments of this application can be achieved, and this document does not impose any restrictions.

[0087] The specific embodiments described above do not constitute a limitation on the scope of protection of the embodiments of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the principles of the embodiments of this application should be included within the scope of protection of the embodiments of this application.

Claims

1. A twin press plate assembly, characterized by, The fixing piece (300) is arranged at one end of the base (200) along a first direction, and the fixing piece (300) is provided with a connecting part (310) which extends out of the base (200) along the first direction. The base (200) is provided with a plurality of mounting parts (210). The fixing piece (300) is arranged at one end of the base (200) along a first direction, and the fixing piece (300) is provided with a connecting part (310) which extends out of the base (200) along the first direction. The plurality of mounting parts (210) includes a plurality of first mounting parts (211) and a plurality of second mounting parts (212).

2. The twin pressure plate assembly of claim 1 wherein, The base (200) is arranged as a square base, and the plurality of first mounting parts (211) are arranged in a square shape, and the arrangement direction of the plurality of first mounting parts (211) is parallel to the edge of the square base. The plurality of second mounting parts (212) are arranged in a square shape, and the arrangement direction of the plurality of second mounting parts (212) forms an included angle with the edge of the square base. The fixing piece (300) is provided with a shielding part (320), and the shielding part (320) covers the plurality of first mounting parts (211).

3. The twin pressure plate assembly of claim 2 wherein, The plurality of first mounting parts (211) are arranged in two rows.

4. The twin pressure plate assembly of claim 2 wherein, The number of the shielding part (320) is two, and the two shielding parts (320) are arranged correspondingly to the two rows of first mounting parts (211), and the shielding part (320) shields the corresponding first mounting part (211).

5. The twin pressure plate assembly of claim 4 wherein, The base (200) is provided with a gap slot (220), and the first mounting part (211) is located in the gap slot (220). At least part of the shielding part (320) is arranged in the gap slot (220), and the shielding part (320) corresponds to the first mounting part (211).

6. The twin pressure plate assembly of claim 4 wherein, The mounting part (210) is arranged as a mounting hole. The pressing plate (100) is provided with a plurality of plug-in parts (110), and the plurality of plug-in parts (110) are inserted into the mounting hole.

7. The twin pressure plate assembly of claim 1 wherein, The connecting part (310) is provided with a connecting groove (311) which faces the inner side of the base (200), and the corner of the pressing plate (100) is inserted into the connecting groove (311). The connecting groove (311) is provided with an indicating part (400) which is movably arranged in the connecting groove (311).

8. The twin press plate assembly of any of claims 1-7, wherein, ​ 9. The twin tie plate assembly of claim 8, wherein, ​ The corner of the pressing plate (100) can push the indicating piece (400) to move relative to the connecting groove (311). When the corner of the pressing plate (100) is inserted into the connecting groove (311), the indicating piece (400) is in a first position. When the corner of the pressing plate (100) is not inserted into the connecting groove (311), the indicating piece (400) is in a second position.

10. The twin pressure plate assembly of claim 9 wherein, The connecting part (310) is provided with an indicating opening (500) which is communicated with the connecting groove (311). The indicating piece (400) can be exposed through the indicating opening (500) to display the position of the indicating piece (400).