A pressurized pre-tensioning device

Abstract

This application provides a pressing pre-tightening device for use in energy storage devices. The pressing pre-tightening device includes a base plate with a first column, the first column having a first hinge hole; a movable plate with a pressing protrusion and a positioning post; a spring sleeved on the positioning post providing an elastic force to force the movable plate to move upward; a handle with a mounting part having a mounting groove, a first mounting hole, a second hinge hole, a first locking groove, and a second locking groove; a pressure plate with a second column, the second column having a second mounting hole; the first column is hinged in the mounting groove, the first hinge hole and the second hinge hole being coaxially arranged; the second column is fixed in the mounting groove, the first mounting hole and the second mounting hole being coaxially arranged; the handle rotates around the first hinge hole to allow the pressing protrusion to enter the first locking groove or the second locking groove; when the pressing protrusion enters the first locking groove or the second locking groove, the spring provides an elastic force to lock the pressing protrusion into the first locking groove or the second locking groove.

Description

Technical Field

[0001] This utility model relates to the field of energy storage equipment technology, and in particular to a pressing and pre-tightening device. Background Technology

[0002] The increasing complexity of electronic products has led to a rise in failure rates. In product structural design, achieving reliable and stable physical connections between various functional modules or units to form a robust connected structure has become a critical factor affecting product performance and maintainability. Typically, such connections rely on mechanical methods such as screws, clips, and springs, or pre-tightening devices combining these methods to ensure good fit and clamping force between components.

[0003] However, due to limitations imposed by different usage scenarios, product forms, and cost control requirements, coupled with the continuous rise in manual assembly costs, the application of traditional mechanical connection methods faces severe challenges. Currently, pre-tightening devices using the aforementioned connection methods are gradually decreasing in practical applications. Existing mainstream connection methods each have their own technical limitations:

[0004] (1) Screw connection: The connection is firm and reliable, but assembly and disassembly depend on special tools, the process is complicated, the labor cost is high, and it is not conducive to rapid maintenance and mass production;

[0005] (2) Snap-fit ​​connection: No tools required, easy to assemble and neat appearance, but low structural strength, poor impact resistance, and difficult to repair once damaged. It is not suitable for large equipment or high vibration and high intensity working environment.

[0006] (3) Welded connection: The connection has high strength and compact structure, but the process requirements are high and the working environment is harsh. It is not suitable for assembly scenarios containing electronic components. Furthermore, it is not disassembled, lacks maintainability and reversibility, and is extremely difficult to maintain later.

[0007] In summary, traditional pre-tightening devices generally suffer from problems such as low assembly and disassembly efficiency, high maintenance costs, poor maintainability, and even complete non-disassembly, making it difficult to meet the demands of modern electronic products for efficient assembly, rapid maintenance, and sustainable design. Utility Model Content

[0008] The pressing pre-tightening device provided by this utility model aims to solve at least some of the defects of existing pre-tightening devices.

[0009] This utility model provides a pressing pre-tightening device. The pressing pre-tightening device is applied to energy storage equipment, and the pressing pre-tightening device includes:

[0010] A substrate, wherein a pair of first pillars and a pair of receiving boxes are provided on the substrate, the first pillars are provided with first hinge holes, and the receiving boxes are provided with receiving cavities inside;

[0011] A pair of movable plates, wherein the movable plates are provided with pressing protrusions and positioning posts that are opposite to each other;

[0012] A spring, which is sleeved on the positioning post, and both the spring and the positioning post are disposed within the receiving cavity;

[0013] The spring can provide an elastic force, and the elastic force is used to force the movable plate to move away from the bottom of the receiving cavity along the thickness direction of the substrate;

[0014] The handle has a pair of mounting parts, and the mounting parts are provided with a mounting groove, a first mounting hole, a second hinge hole, a first slot and a second slot;

[0015] A pressure plate, wherein a pair of second columns are provided on the pressure plate, and the second columns are provided with second mounting holes;

[0016] The first column is hinged in the mounting groove, and the first hinge hole and the second hinge hole are coaxially arranged.

[0017] The second column is fixed in the mounting groove, at which time the first mounting hole and the second mounting hole are coaxially arranged;

[0018] The handle can rotate relative to the substrate around the first hinge hole or the second hinge hole, so that the pressing protrusion enters the first slot or the second slot, and the pressure plate can rotate with the rotation of the handle;

[0019] When the pressing protrusion enters the first or second slot, the spring provides the elastic force to make the pressing protrusion lock into the first or second slot.

[0020] In some embodiments, the outer contour surface of the pressing protrusion has a shape and size that are adapted to the first card slot, and the outer contour surface of the pressing protrusion has a shape and size that are adapted to the second card slot.

[0021] In some embodiments, the pressing pre-tightening device further includes:

[0022] Fixing plate and fixing unit;

[0023] The fixing plate is mounted on the fixing unit, and the side of the fixing plate facing away from the fixing unit abuts against the side of the base plate facing away from the first column.

[0024] In some embodiments, when the pressing protrusion is engaged in the first slot, the pressure plate forms a preset first angle with the surface of the fixing unit;

[0025] When the pressing protrusion is engaged in the second slot, the pressure plate and the surface of the fixing unit form a preset second angle;

[0026] Wherein, the first angle is greater than the second angle.

[0027] In some embodiments, the housing includes:

[0028] A frame and a top plate, the frame protruding from the surface of the substrate, and the top plate covering the end of the frame opposite to the substrate;

[0029] The surfaces of the frame, the top plate, and the substrate together enclose the receiving cavity.

[0030] In some embodiments, the top plate is provided with an opening, and the opening is connected to the receiving cavity;

[0031] The projection of the receiving cavity onto the surface of the substrate has a first area, and the projection of the opening onto the surface of the substrate has a second area.

[0032] The first area is larger than the second area.

[0033] In some embodiments, the active panel includes:

[0034] A first main body and a second main body, wherein the first main body is disposed on the second main body;

[0035] The projection of the first body onto the surface of the substrate has a third area, and the projection of the second body onto the surface of the substrate has a fourth area.

[0036] The third area is smaller than the fourth area.

[0037] In some embodiments, the third area does not exceed the second area, so that the first body can freely pass through the opening.

[0038] In some embodiments, the fourth area does not exceed the first area, so that the two main bodies can be accommodated within the receiving cavity;

[0039] The fourth area is larger than the second area to restrict the second body from detaching from the receiving cavity at the opening.

[0040] In some embodiments, the pressing protrusion is disposed on the side of the first body opposite to the second body;

[0041] The outer contour surface of the pressing protrusion is connected to the side of the first body that is away from the second body through an arc surface;

[0042] The positioning post protrudes from the side of the second body that is away from the first body.

[0043] At least one beneficial effect of the pressing pre-tightening device provided in this utility model embodiment is that, compared with the traditional pre-tightening device, the pressing pre-tightening device does not require the use of screws for connection, nor does it require the use of tools for disassembly and maintenance. This makes the pressing pre-tightening device have high disassembly and assembly efficiency, thus enabling the pressing pre-tightening device to achieve quick disassembly and assembly. Moreover, the pressing pre-tightening device does not require manual maintenance, which makes the pressing pre-tightening device have low maintenance costs. Attached Figure Description

[0044] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are designated as the same elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0045] Figure 1 A schematic diagram of the structure of the pressing and pre-tightening device provided in the embodiment of this utility model, showing the connected unit placed in the open state;

[0046] Figure 2 This is a schematic diagram of the structure of the pressing and pre-tightening device provided in the embodiment of the present invention, which clamps the connected unit in the closed state;

[0047] Figure 3 A schematic diagram of the press-and-tighten device without a fixing unit in the open state, provided in an embodiment of the present utility model;

[0048] Figure 4 A schematic diagram of the press-and-tighten device without a fixing unit in the closed state, provided in an embodiment of the present utility model;

[0049] Figure 5 A cross-sectional view of the press-and-tighten device without a fixing unit provided in the embodiment of the present utility model in the open state;

[0050] Figure 6 Provided for the embodiments of this utility model Figure 5 A magnified view of a portion at point A;

[0051] Figure 7 A schematic diagram of the substrate, first column, and receiving box provided in an embodiment of this utility model;

[0052] Figure 8 This is a schematic diagram of the handle and mounting part provided in an embodiment of the present utility model;

[0053] Figure 9A schematic diagram of the movable plate, pressing protrusion, and positioning post provided in an embodiment of this utility model;

[0054] Figure 10 This is a schematic diagram of the structure of the pressure plate and the second column provided in an embodiment of the present utility model.

[0055] Figure label:

[0056] 100. Pressing pre-tightening device; 1. Base plate; 11. First column; 12. Receiving box; 111. First hinge hole; 101. Through hole; 102. Threaded hole; 121. Frame; 122. Top plate; 1201. Receiving cavity; 1221. Opening; 2. Movable plate; 21. First main body; 22. Second main body; 211. Pressing protrusion; 212. Arc surface; 221. Positioning post; 3. Spring; 4. Handle; 4 1. Mounting section; 411. Mounting slot; 412. First mounting hole; 413. Second hinge hole; 414. First slot; 415. Second slot; 5. Pressure plate; 51. Second column; 511. Second mounting hole; 6. Cylindrical screw; 7. First nut; 8. Hexagonal head screw; 9. Second nut; 10. Fixing plate; 1001. Fixing unit; 1002. First fastening screw; 1003. Second fastening screw;

[0057] 200. Connected unit. Detailed Implementation

[0058] The present invention will now be described in detail with reference to specific embodiments. It should be emphasized that the following description is merely exemplary and is not intended to limit the scope and application of the present invention.

[0059] It should be noted that, unless otherwise expressly specified and limited, the terms “away from,” “away from,” “detached from,” “through,” “enter,” etc., used in this specification indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this 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 this utility model. The terms "installation," "fitting," "connection," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. "Fixing" can be bolt fixing, snap-fit ​​fixing, or glue fixing. The terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," "third," and "fourth" may explicitly or implicitly include one or more of that feature. "A plurality" or "several" means two or more. In addition, "and / or" includes any and all combinations of one or more of the related listed items. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0060] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0061] In this embodiment, the specific implementation of the "pressing pre-tightening device" is not limited. Those skilled in the art can selectively use any suitable implementation method according to actual needs.

[0062] In the following description, such as Figures 1-10 As shown, the following situations exist: the movable plate 2 is moved along the thickness direction of the substrate 1 towards the bottom of the receiving cavity 1201 or the spring 3 is compressed and set to "moving downward", and the movable plate 2 is moved along the thickness direction of the substrate 1 away from the bottom of the receiving cavity 1201 or the spring 3 is reset and set to "moving upward".

[0063] Please see Figures 1-10 The pressing and pre-tightening device 100 is applied to an energy storage device, and the pressing and pre-tightening device 100 includes: a base plate 1, a pair of movable plates 2, a spring 3, a handle 4, and a pressure plate 5.

[0064] It should be noted that the pressing pre-tightening device 100 can ensure that the connected unit 200 has a firm and reliable fit or clamping.

[0065] The substrate 1 is provided with a pair of first pillars 11 and a pair of receiving boxes 12. The first pillars 11 are provided with first hinge holes 111, and the receiving boxes 12 form receiving cavities 1201 inside.

[0066] In addition, the movable plate 2 is provided with mutually opposing pressing protrusions 211 and positioning posts 221. The shape of the outer contour surface of the pressing protrusion is not limited to arc shape, and the number of positioning posts is not limited to 2.

[0067] In addition, the spring 3 is sleeved on the positioning post 221, and both the spring 3 and the positioning post 221 are located in the receiving cavity 1201.

[0068] Specifically, one end of the spring 3 abuts against the bottom of the receiving cavity 1201, and the other end of the spring 3 abuts against the bottom of the movable plate 2 (the bottom of the movable plate 2 is the side of the second body 22 that is away from the first body 21).

[0069] Furthermore, the spring 3 provides an elastic force, which is used to force the movable plate 2 to move upward.

[0070] In this embodiment of the application, the handle 4 is provided with a pair of mounting portions 41, and the mounting portions 41 are provided with mounting grooves 411, first mounting holes 412, second hinge holes 413, first slots 414 and second slots 415.

[0071] To further explain, a pair of second columns 51 are provided on the pressure plate 5, and the second columns 51 are provided with second mounting holes 511.

[0072] In this embodiment of the application, both the first mounting hole 412 and the second mounting hole 511 are hexagonal in shape.

[0073] It should be noted that, firstly, the first column 11 is placed in the mounting groove 411, and the first hinge hole 111 and the second hinge hole 413 are coaxially arranged. Then, the threaded end of the cylindrical screw 6 (which can be regarded as the hinge shaft) is passed through the first hinge hole 111 and the second hinge hole 413. Finally, the first nut 7 is screwed into the thread of the cylindrical screw 6. This makes the first column 11 hinged in the mounting groove 411 or hinged on the mounting part 41.

[0074] Understandably, the second column 51 is first placed in the mounting groove 411, and the first mounting hole 412 and the second mounting hole 511 are coaxially arranged. Then, the threaded end of the external hexagonal screw 8 is passed through the first mounting hole 412 and the second mounting hole 511. Finally, the second nut 9 is screwed into the thread of the external hexagonal screw 8. This fixes the second column 51 in the mounting groove 411 or on the mounting part 41, so that the pressure plate 5 and the handle 4 form a whole.

[0075] Specifically, the handle 4 can rotate relative to the base plate 1 around the first hinge hole 111, the second hinge hole 413 or the cylindrical screw 6 so that the pressing protrusion 211 enters the first slot 414 or the second slot 415, and the pressure plate 5 can rotate with the rotation of the handle 4.

[0076] To further explain, when the pressing protrusion 211 enters the first slot 414 or the second slot 415, the spring 3 provides elastic force to make the pressing protrusion 211 lock into the first slot 414 or the second slot 415. This means that the pressing pre-tightening device 100 does not need to be connected with screws, nor does it need to be disassembled and maintained with tools. This makes the pressing pre-tightening device have high disassembly and assembly efficiency, and thus enables the pressing pre-tightening device to be quickly disassembled and assembled.

[0077] Preferably, the side of the pressure plate 5 that contacts the connected unit 200 can be made of elastic material, or the pressure plate 5 can be made of a structure such as a pin, soft rubber, or spring, so that the connected unit 200 can be subjected to different magnitudes of force.

[0078] In some embodiments, such as Figure 6 , Figure 8 and Figure 9 As shown, the outer contour surface of the pressing protrusion 211 has a shape and size that are compatible with the first slot 414, and the outer contour surface of the pressing protrusion 211 has a shape and size that are compatible with the second slot 415.

[0079] In some embodiments, combined with Figures 1-10 It can be seen that the pressing pre-tightening device 100 also includes: a fixing plate 10 and a fixing unit 1001.

[0080] It should be noted that the fixing plate 10 is assembled on the fixing unit 1001, and the side of the fixing plate 10 away from the fixing unit 1001 abuts against the side of the base plate 1 away from the first column 11.

[0081] It is understood that the substrate 1 is provided with a through hole 101 and a threaded hole 102, and the user can pass the first fastening screw 1002 out of the threaded hole 102 from the fixing plate 10 toward the substrate 1.

[0082] To further explain, the user can pass the second fastening screw 1003 from the base plate 1 through the through hole 101 and the fixing plate 10 in sequence towards the fixing unit 1001 until it is inserted into the fixing unit 1001.

[0083] In some embodiments, according to Figures 1-10 It can be seen that when the protrusion 211 is pressed and locked in the first slot 414, the pressure plate 5 and the surface of the fixing unit form a preset first angle.

[0084] When the protrusion 211 is pressed and locked in the second slot 415, the pressure plate 5 forms a preset second angle with the surface of the fixing unit.

[0085] In addition, the first angle is greater than the second angle, and both the first and second angles can be adjusted. The way to adjust the first and second angles is to change the opening position of the first slot 414 and the second slot 415. Adjusting the first and second angles can make the pressure plate 5 achieve different effects.

[0086] For example, the first angle in this embodiment is 90°, while the second angle is determined by the dimension of the connected unit 200 in its thickness direction (the second angle can be 0° if there is no connected unit 200).

[0087] When the pressure plate 5 forms a preset second angle with the surface of the fixing unit, the pressure plate 5 is in the open state, at which time the user can place the connected unit 200 on the fixing unit.

[0088] In addition, when the pressure plate 5 forms a preset first angle with the surface of the fixing unit, the pressure plate 5 is in a closed state. At this time, the pressure plate 5 can restrict the degree of freedom of the connected unit 200 on the fixing unit so that the connected unit has a firm and reliable fit or clamping.

[0089] Furthermore, during the assembly of the first column 11 and the mounting part 41, the pressing protrusion 211 should be locked in the first slot 414 first, that is, the pressure plate 5 should be switched to the open state.

[0090] Combination Figures 1-10 The process of switching the pressure plate 5 to the open state is described in detail as follows: First, a first force is applied to the handle 4 so that the handle 4 rotates relative to the base plate 1 around the first hinge hole 111, the second hinge hole 413 or the cylindrical screw 6. At this time, the outer contour surface of the mounting part 41 can press the pressing protrusion 211 of the movable plate 2, thereby forcing the movable plate 2 to move downward and forcing the spring 3 to be compressed. Finally, when the handle 4 rotates to the point where the first slot 414 and the pressing protrusion 211 of the movable plate 2 cooperate with each other, the pressure plate 5 can be switched to the open state.

[0091] Combination Figures 1-10 The process of switching the pressure plate 5 to the closed state is described in detail as follows: First, a second force is applied to the handle 4 so that the handle 4 rotates relative to the base plate 1 around the first hinge hole 111, the second hinge hole 413 or the cylindrical screw 6. At this time, the outer contour surface of the mounting part 41 can press the pressing protrusion 211 of the movable plate 2, thereby forcing the movable plate 2 to move downward and forcing the spring 3 to be compressed. Finally, when the handle 4 rotates to the point where the second slot 415 cooperates with the pressing protrusion 211 of the movable plate 2, the pressure plate 5 can switch to the closed state.

[0092] It should be noted that the direction of the first force is opposite to the direction of the second force.

[0093] In some embodiments, by Figure 6 and Figure 7 It is known that the housing 12 includes: a frame 121 and a top plate 122.

[0094] Specifically, the frame 121 protrudes from the surface of the substrate 1, and the top plate 122 covers the end of the frame 121 that is away from the substrate 1.

[0095] To further explain, the frame 121, the top plate 122 and the surface of the substrate 1 together enclose and form the receiving cavity 1201.

[0096] In some embodiments, refer to Figures 3-9 It can be seen that the top plate 122 is provided with an opening 1221, and the opening 1221 is connected to the receiving cavity 1201.

[0097] It is understood that the projection of the receiving cavity 1201 onto the surface of the substrate 1 has a first area, and the projection of the opening 1221 onto the surface of the substrate 1 has a second area.

[0098] It should be noted that the first area is larger than the second area.

[0099] In some embodiments, please refer to Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 9 The movable board 2 includes: a first main body 21 and a second main body 22.

[0100] The first main body 21 is mounted on the second main body 22.

[0101] In addition, the projection of the first body 21 onto the surface of the substrate 1 has a third area, and the projection of the second body 22 onto the surface of the substrate 1 has a fourth area.

[0102] Furthermore, the third area is smaller than the fourth area.

[0103] In some embodiments, such as Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 9 As shown, the third area does not exceed the second area, so that the first body 21 can freely pass through the opening 1221.

[0104] In some embodiments, combined with Figure 3 , Figure 4 , Figure 6 , Figure 7 and Figure 9 It is known that the fourth area does not exceed the first area, so that the two main bodies can be accommodated in the receiving cavity 1201.

[0105] Specifically, the fourth area is larger than the second area to restrict the second body 22 from disengaging from the opening 1221 into the receiving cavity 1201.

[0106] In some embodiments, refer to Figure 6 and Figure 9 It can be seen that the pressing protrusion 211 is set on the side of the first body 21 that is away from the second body 22.

[0107] In this embodiment, the outer contour surface of the pressing protrusion 211 is connected to the side of the first body 21 that is away from the second body 22 through the arc surface 212.

[0108] To further explain, the positioning post 221 protrudes from the side of the second body 22 that is opposite to the first body 21.

[0109] In summary, the pressing pre-tightening device provided by this utility model embodiment, compared with the traditional pre-tightening device, does not require the use of screws for connection, nor does it require the use of tools for disassembly and maintenance. This makes the pressing pre-tightening device have high disassembly and assembly efficiency, thus enabling the pressing pre-tightening device to be quickly disassembled and assembled. Moreover, the pressing pre-tightening device does not require manual maintenance, which makes the pressing pre-tightening device have low maintenance costs.

[0110] The above description, in conjunction with specific / preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. Those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and all of these fall within the protection scope of the present invention.

Claims

1. A pressing and pre-tightening device, applied to energy storage equipment, characterized in that, include: A substrate, wherein a pair of first pillars and a pair of receiving boxes are provided on the substrate, the first pillars are provided with first hinge holes, and the receiving boxes are provided with receiving cavities inside; A pair of movable plates, wherein the movable plates are provided with pressing protrusions and positioning posts that are opposite to each other; A spring, which is sleeved on the positioning post, and both the spring and the positioning post are disposed within the receiving cavity; The spring can provide an elastic force, and the elastic force is used to force the movable plate to move away from the bottom of the receiving cavity along the thickness direction of the substrate; The handle has a pair of mounting parts, and the mounting parts are provided with a mounting groove, a first mounting hole, a second hinge hole, a first slot and a second slot; A pressure plate, wherein a pair of second columns are provided on the pressure plate, and the second columns are provided with second mounting holes; The first column is hinged in the mounting groove, and the first hinge hole and the second hinge hole are coaxially arranged. The second column is fixed in the mounting groove, at which time the first mounting hole and the second mounting hole are coaxially arranged; The handle can rotate relative to the substrate around the first hinge hole or the second hinge hole, so that the pressing protrusion enters the first slot or the second slot, and the pressure plate can rotate with the rotation of the handle; When the pressing protrusion enters the first or second slot, the spring provides the elastic force to make the pressing protrusion lock into the first or second slot.

2. The pressing and pre-tightening device according to claim 1, characterized in that, The outer contour surface of the pressing protrusion has a shape and size that are compatible with the first card slot, and the outer contour surface of the pressing protrusion has a shape and size that are compatible with the second card slot.

3. The pressing and pre-tightening device according to claim 1, characterized in that, Also includes: Fixing plate and fixing unit; The fixing plate is mounted on the fixing unit, and the side of the fixing plate facing away from the fixing unit abuts against the side of the base plate facing away from the first column.

4. The pressing and pre-tightening device according to claim 3, characterized in that, When the pressing protrusion is engaged in the first slot, the pressure plate and the surface of the fixing unit form a preset first angle; When the pressing protrusion is engaged in the second slot, the pressure plate and the surface of the fixing unit form a preset second angle; Wherein, the first angle is greater than the second angle.

5. The pressing and pre-tightening device according to claim 1, characterized in that, The container includes: A frame and a top plate, the frame protruding from the surface of the substrate, and the top plate covering the end of the frame opposite to the substrate; The surfaces of the frame, the top plate, and the substrate together enclose the receiving cavity.

6. The pressing and pre-tightening device according to claim 5, characterized in that, An opening is provided on the top plate, and the opening is connected to the receiving cavity; The projection of the receiving cavity onto the surface of the substrate has a first area, and the projection of the opening onto the surface of the substrate has a second area. The first area is larger than the second area.

7. The pressing and pre-tightening device according to claim 6, characterized in that, The movable panel includes: A first main body and a second main body, wherein the first main body is disposed on the second main body; The projection of the first body onto the surface of the substrate has a third area, and the projection of the second body onto the surface of the substrate has a fourth area. The third area is smaller than the fourth area.

8. The pressing and pre-tightening device according to claim 7, characterized in that, The third area does not exceed the second area, so that the first body can freely pass through the opening.

9. The pressing and pre-tightening device according to claim 7, characterized in that, The fourth area does not exceed the first area, so that the two main bodies can be accommodated within the receiving cavity; The fourth area is larger than the second area to restrict the second body from detaching from the receiving cavity at the opening.

10. The pressing and pre-tightening device according to claim 7, characterized in that, The pressing protrusion is provided on the side of the first body opposite to the second body; The outer contour surface of the pressing protrusion is connected to the side of the first body that is away from the second body through an arc surface; The positioning post protrudes from the side of the second body that is away from the first body.

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