Fireproof heat-insulation mica gasket and preparation method thereof

Abstract

The invention discloses a fireproof heat-insulation mica gasket and a preparation method thereof, and relates to the technical field of mica gasket preparation, the fireproof heat-insulation mica gasket comprises a gasket main body, an upper metal net is pressed and fixed on the top of the gasket main body, and a lower metal net is pressed and fixed on the bottom of the gasket main body; the gasket main body is formed by mixing and pressing mica powder, high-temperature-resistant resin adhesive, refractory fibers and a flame retardant, and the mass ratio of the mica powder to the high-temperature-resistant resin adhesive to the refractory fibers to the flame retardant is 5.5: 2.5: 1.2: 0.8. According to the fireproof and heat-insulating mica gasket and the preparation method thereof, the fireproof fibers and the flame retardant are introduced into the preparation raw materials of the mica gasket, mica powder and other fireproof and heat-insulating materials are combined for use to form a more excellent fireproof and heat-insulating effect, and the mica gasket is subjected to composite structure design, so that the structural stability is enhanced, and the service life of the mica gasket is prolonged. The effect of increasing the thickness and the number of layers of the mica gasket is achieved, and therefore the overall fireproof and heat-insulating capacity of the mica gasket is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of mica gasket preparation, in particular to a fireproof and heat-insulating mica gasket and a preparation method thereof. Background Art

[0002] Mica gaskets are rectangular or special-shaped mica parts made by splitting, setting thickness, cutting or punching thick mica sheets. They usually have good mechanical strength, electrical properties and high temperature resistance. Under normal conditions, mica gaskets can stably maintain their performance, so they are widely used in various occasions that require insulation and high temperature resistance. In recent years, with the continuous improvement of mica insulation material production technology, the performance of mica gaskets has also been significantly improved, and the application field has continued to expand.

[0003] In the new energy vehicle industry, mica materials are mainly used as thermal runaway protection materials for power batteries. Mica gaskets are widely used for thermal runaway protection between modules and between modules and battery covers due to their excellent high temperature resistance, high voltage resistance, insulation and softness. With the development of the trend of modularization, mica materials may also be used for thermal runaway protection between battery cells and battery covers. According to relevant agencies, the proportion of mica materials in flame-retardant and heat-insulating materials for power batteries will increase year by year.

[0004] However, although mica gaskets have many advantages, with the rapid development of the new energy vehicle industry, the energy density of batteries has gradually increased, and the requirements for thermal runaway protection have become higher and higher. Mica gaskets, as one of the important thermal runaway protection materials, have gradually been unable to meet the growing demand for thermal runaway protection; in addition, in the preparation process of mica gaskets, due to the special properties of mica materials, the processing difficulty is relatively large, and professional equipment and processes are required, especially in the mixing and pressing stage. If the pressing force is too small, the gasket is not easy to form and is easy to loosen. If the pressing force is too large, it will cause the finished product to break, resulting in a low yield rate of mica gaskets.

[0005] Therefore, it is urgent to improve this shortcoming. The present invention studies and improves the existing structure and shortcomings, and provides a fireproof and heat-insulating mica gasket and a preparation method thereof. Summary of the invention

[0006] The object of the present invention is to provide a fireproof and heat-insulating mica gasket and a preparation method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] In the first aspect, a fireproof and heat-insulating mica gasket is provided, comprising a gasket body, an upper metal mesh is pressed and fixed on the top of the gasket body, and a lower metal mesh is pressed and fixed on the bottom of the gasket body, the gasket body is formed by mixing and pressing mica powder, high-temperature resistant resin glue, refractory fiber and flame retardant, and the mass ratio of mica powder, high-temperature resistant resin glue, refractory fiber and flame retardant is 5.5:2.5:1.2:0.8.

[0009] In a second aspect, a method for preparing a fireproof and heat-insulating mica gasket is provided, which is applied to the fireproof and heat-insulating mica gasket as described above, and comprises the following steps:

[0010] S1. Raw material preparation: Select high-quality mica ore as raw material, and obtain mica powder that meets the requirements through crushing and screening;

[0011] S2. Raw material mixing: put mica powder, high temperature resistant resin glue, refractory fiber and flame retardant into a mixing bin and mix them evenly for later use;

[0012] S3, Rotary loading: The lower metal mesh is conveyed into the pressing trough by the first conveyor belt, and then the processing seat rotates 90 degrees counterclockwise, and the material in the mixing bin is conveyed into the pressing trough by the transverse auger, and then the processing seat rotates 90 degrees counterclockwise again, and the upper metal mesh is conveyed into the pressing trough by the second conveyor belt, and then the processing seat rotates 90 degrees counterclockwise to rotate the pressing trough to the bottom of the pressing assembly;

[0013] S4, pressing and forming: pressing the lower metal mesh, the mixed material and the upper metal mesh in the pressing tank by a pressing component to obtain a mica gasket semi-finished product, and after the mica gasket semi-finished product is ejected from the pressing tank, the mica gasket semi-finished product is pushed onto the third conveyor belt by a pushing component to be conveyed to the next processing link;

[0014] S5. Curing treatment: The pressed gasket semi-finished product is cured to improve its fire-resistant, heat-insulating and mechanical strength.

[0015] Furthermore, the processing seat includes a fixed base, an annular groove, a servo motor and a movable disk. The top of the fixed base is provided with an annular groove, and a servo motor is fixedly installed at the top center position of the fixed base, and the output shaft of the servo motor is fixedly connected to the movable disk through a coupling.

[0016] Furthermore, the processing seat includes a supporting slide rod, the top end of the supporting slide rod is fixedly connected to the bottom of the movable disk, and the supporting slide rods are equidistantly arranged in a circular array, the bottom size of the supporting slide rod is completely consistent with the internal size of the annular groove, and the movable disk forms a sliding structure with the fixed base through the supporting slide rod and the annular groove.

[0017] Furthermore, the processing seat also includes a first lifting cylinder, a slot support, a cross and a top seat. The first lifting cylinder is fixedly installed on the top of the movable disk, and the top of the lifting cylinder is fixedly connected to the slot support, the top of the movable disk is fixedly connected to the cross, and the top of the cross is fixedly connected to the top seat, and the top seat is fixed directly above the movable disk through the cross.

[0018] Furthermore, the number of the pressing grooves and the number of the first lifting cylinders are both four, and the four pressing grooves are arranged in a one-to-one correspondence with the four first lifting cylinders, and the shape and size of the pressing grooves match the shape and size of the groove supports, and the groove supports are located inside the pressing grooves.

[0019] Furthermore, the pusher assembly includes a fixed seat body, an electric push rod and a guide cover. The fixed seat body is fixed at the top center position of the top seat, and the outer wall of the fixed seat body is fixedly connected to the electric push rod, and one end of the electric push rod is fixedly connected to the guide cover.

[0020] Furthermore, the number of the electric push rods is four, and the angle between two adjacent electric push rods is ninety degrees.

[0021] Furthermore, the material pressing assembly includes a second lifting cylinder, a fixed plate and a pressure sensor. The bottom end of the second lifting cylinder is fixedly connected to the fixed plate, and the pressure sensor is installed at the bottom of the fixed plate.

[0022] Furthermore, the pressing assembly also includes a spring, a pressing plate and a guide rod. The top end of the spring is fixedly connected to the bottom of the fixed plate, and the bottom end of the spring is fixedly connected to the pressing plate. A guide rod is vertically fixed to the top of the pressing plate, and the guide rod passes through the inner center of the spring and forms a through structure with the fixed plate.

[0023] The present invention provides a fireproof and heat-insulating mica gasket and a preparation method thereof, which have the following beneficial effects:

[0024] 1. The present invention introduces refractory fibers and flame retardants into the raw materials for preparing mica gaskets, combines mica powder with other fireproof and heat-insulating materials to form a better fireproof and heat-insulating effect, and designs a composite structure for the mica gasket. Metal meshes are pressed and embedded on the top and bottom of the gasket, which enhances the structural stability while increasing the thickness and number of layers of the mica gasket, thereby further improving its overall fireproof and heat-insulating capabilities.

[0025] 2. The present invention drives the movable disk to rotate through a servo motor, thereby driving the top seat to rotate, so that the pressing groove can rotate and switch between four operating positions, so that three loading operations and one pressing operation can be carried out simultaneously, and cooperates with the first conveyor belt, the second conveyor belt and the horizontal auger to realize automatic loading operation, and cooperates with the pushing assembly and the third conveyor belt to realize automatic unloading operation, truly realizing the uninterrupted preparation of mica gaskets, and greatly improving the preparation efficiency of mica gaskets.

[0026] 3. During the gasket pressing and molding operation, the present invention uses a pressure sensor to sense the changes in pressing force in real time, and buffers the pressing force through the contraction of the spring. When the pressure sensor senses that the downward pressure has reached a set value, it immediately controls the second lifting cylinder to stop the downward pressure operation, thereby strictly controlling the pressing force to avoid failure of mica gasket pressing due to excessive or insufficient pressing force, and helping to improve the yield rate of mica gaskets. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional structural schematic diagram of an insulating gasket of the present invention;

[0028] Figure 2 It is a schematic flow chart of a method for preparing an insulating gasket of the present invention;

[0029] Figure 3 A schematic diagram of equipment for a method for preparing an insulating gasket of the present invention;

[0030] Figure 4 A method for preparing an insulating gasket according to the present invention Figure 3 A schematic diagram of the structure enlargement in the middle;

[0031] Figure 5 A schematic diagram of a top view of a processing seat in a method for preparing an insulating gasket of the present invention;

[0032] Figure 6 It is a schematic diagram of the disassembly of the processing seat structure of a method for preparing an insulating gasket of the present invention;

[0033] Figure 7 The present invention is a schematic diagram of a top seat cross-sectional structure of a method for preparing an insulating gasket.

[0034] In the figure: 1. Processing seat; 11. Fixed base; 12. Annular groove; 13. Servo motor; 14. Movable disk; 15. Support slide rod; 16. First lifting cylinder; 17. Groove support; 18. Cross; 19. Top seat; 2. Pressing groove; 3. Pushing assembly; 31. Fixed seat body; 32. Electric push rod; 33. Guide cover; 4. Horizontal auger; 5. Mixing bin; 6. First conveyor belt; 7. Second conveyor belt; 8. Third conveyor belt; 9. Pressing assembly; 91. Second lifting cylinder; 92. Fixed disk; 93. Pressure sensor; 94. Spring; 95. Pressing disk; 96. Guide rod. DETAILED DESCRIPTION

[0035] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0036] Embodiment 1

[0037] like Figure 1 As shown, a fireproof and heat-insulating mica gasket includes a gasket body, an upper metal mesh is pressed and fixed on the top of the gasket body, and a lower metal mesh is pressed and fixed on the bottom of the gasket body. The gasket body is formed by mixing and pressing mica powder, high-temperature resistant resin glue, refractory fiber, and flame retardant, and the mass ratio of mica powder, high-temperature resistant resin glue, refractory fiber, and flame retardant is 5.5:2.5:1.2:0.8.

[0038] Embodiment 2

[0039] like Figure 2-Figure 7 As shown, a method for preparing a fireproof and heat-insulating mica gasket is applied to the fireproof and heat-insulating mica gasket as described above, comprising the following steps:

[0040] S1. Raw material preparation: Select high-quality mica ore as raw material, and obtain mica powder that meets the requirements through crushing and screening;

[0041] S2, raw material mixing: put mica powder, high temperature resistant resin glue, refractory fiber, and flame retardant into a mixing bin 5 and mix them evenly for standby use;

[0042] S3, rotating loading: the lower metal mesh is conveyed into the pressing tank 2 by the first conveyor belt 6, and then the processing seat 1 is rotated 90 degrees counterclockwise, and the material in the mixing bin 5 is conveyed into the pressing tank 2 by the transverse auger 4, and then the processing seat 1 is rotated 90 degrees counterclockwise again, and the upper metal mesh is conveyed into the pressing tank 2 by the second conveyor belt 7, and then the processing seat 1 is rotated 90 degrees counterclockwise to rotate the pressing tank 2 to the bottom of the pressing assembly 9;

[0043] S4, pressing and forming: the lower metal mesh, the mixed material and the upper metal mesh in the pressing tank 2 are pressed by the pressing component 9 to obtain the mica gasket semi-finished product. After the mica gasket semi-finished product is ejected from the pressing tank 2, the mica gasket semi-finished product is pushed onto the third conveyor belt 8 by the pushing component 3 to be conveyed to the next processing link;

[0044] S5. Curing treatment: The pressed gasket semi-finished product is cured to improve its fire-resistant, heat-insulating and mechanical strength.

[0045] The processing seat 1 includes a fixed base 11, an annular groove 12, a servo motor 13 and a movable disk 14. The top of the fixed base 11 is provided with an annular groove 12, and the servo motor 13 is fixedly installed at the top center of the fixed base 11, and the output shaft of the servo motor 13 is fixedly connected to the movable disk 14 through a coupling;

[0046] The processing seat 1 includes a support slide bar 15, the top of the support slide bar 15 is fixedly connected to the bottom of the movable disk 14, and the support slide bars 15 are arranged equidistantly in a circular array, the bottom size of the support slide bar 15 is completely consistent with the internal size of the annular groove 12, and the movable disk 14 forms a sliding structure with the fixed base 11 through the support slide bar 15 and the annular groove 12;

[0047] The processing seat 1 also includes a first lifting cylinder 16, a slot support 17, a cross 18 and a top seat 19. The first lifting cylinder 16 is fixedly installed on the top of the movable plate 14, and the top of the lifting cylinder 16 is fixedly connected to the slot support 17, the top of the movable plate 14 is fixedly connected to the cross 18, and the top of the cross 18 is fixedly connected to the top seat 19, and the top seat 19 is fixed directly above the movable plate 14 through the cross 18;

[0048] The number of the pressing grooves 2 and the number of the first lifting cylinders 16 are both four, and the four pressing grooves 2 are arranged in a one-to-one correspondence with the four first lifting cylinders 16, and the shape and size of the pressing grooves 2 match the shape and size of the groove support 17, and the groove support 17 is located inside the pressing groove 2;

[0049] The specific operation is as follows: the movable disk 14 is driven to rotate by the servo motor 13, thereby driving the top seat 19 to rotate to change the position of the pressing groove 2, and the position of the pressing groove 2 closest to the first conveyor belt 6 is defined as the initial position. Any pressing groove 2 can return to the initial position after four counterclockwise rotations of 90 degrees. The lower metal mesh can be transported into the pressing groove 2 at the initial position by the first conveyor belt 6, and then the top seat 19 is driven by the servo motor 13 to rotate counterclockwise 90 degrees. At this time, the pressing groove 2 equipped with the lower metal mesh is rotated to the bottom of the discharge port of the horizontal auger 4, and the horizontal auger 4 is started. The mixed material in the mixing bin 5 can be transported into the pressing groove 2 through the horizontal auger 4 and covered on the lower metal mesh. Then the servo motor 13 controls the top seat 19 to rotate counterclockwise 90 degrees again. At this time, the pressing groove 2 loaded with the lower metal mesh and the mixed material is rotated to the position closest to the second conveyor belt 7, and the upper metal mesh is transported into the pressing groove 2 through the second conveyor belt 7 and covered on The top of the mixed material is rotated 90 degrees counterclockwise for the third time under the drive of the servo motor 13, and the pressing groove 2 is rotated to the bottom of the pressing component 9. After the pressing component 9 is pressed and shaped, the mica gasket semi-finished product can be obtained. After the semi-finished product is taken out, the top seat 19 is rotated 90 degrees clockwise for the fourth time to return to the initial position. The servo motor 13 controls the top seat 19 to rotate, which can drive the pressing groove 2 to rotate and switch between four operating positions, so that three loading operations and one pressing operation can be carried out at the same time, so as to realize the uninterrupted preparation of mica gaskets and greatly improve the preparation efficiency of mica gaskets. In addition, during the rotating feeding process, the servo motor 13 drives the movable disk 14 to rotate, and at the same time, it will drive the bottom end of the supporting slide bar 15 to slide along the inner side of the annular groove 12. This design not only limits the rotational motion trajectory of the movable disk 14, but also can support the movable disk 14, which is beneficial to improving the rotational stability of the movable disk 14 and the top seat 19.

[0050] The push assembly 3 includes a fixed seat body 31, an electric push rod 32 and a guide cover 33. The fixed seat body 31 is fixed at the top center position of the top seat 19, and the outer wall of the fixed seat body 31 is fixedly connected to the electric push rod 32, and one end of the electric push rod 32 is fixedly connected to the guide cover 33;

[0051] There are four electric push rods 32, and the angle between two adjacent electric push rods 32 is ninety degrees;

[0052] The material pressing assembly 9 includes a second lifting cylinder 91, a fixed plate 92 and a pressure sensor 93. The bottom end of the second lifting cylinder 91 is fixedly connected to the fixed plate 92, and the pressure sensor 93 is installed at the bottom of the fixed plate 92.

[0053] The pressing assembly 9 also includes a spring 94, a pressing plate 95 and a guide rod 96. The top of the spring 94 is fixedly connected to the bottom of the fixed plate 92, and the bottom of the spring 94 is fixedly connected to the pressing plate 95. The top of the pressing plate 95 is vertically fixed with a guide rod 96, and the guide rod 96 passes through the inner center of the spring 94 and forms a through structure with the fixed plate 92.

[0054] The specific operation is as follows: the fixed plate 92 is driven downward by the second lifting cylinder 91, thereby driving the pressing plate 95 to move downward, and the lower metal mesh, mixed material, and upper metal mesh in the pressing groove 2 are pressed into a whole to obtain a mica gasket semi-finished product. In this process, as the pressing plate 95 moves downward, the pressure sensor 93 will synchronously sense the change in the pressing force, and at the same time, the spring 94 is forced to shrink, and the fixed plate 92 and the pressing plate 95 continue to approach each other under the guidance limit of the guide rod 96. When the pressure sensor 93 senses that the downward pressure reaches the set value, the second lifting cylinder 91 will stop the downward pressure operation and stand still for a few seconds to complete the pressing and molding operation. At this time, the mica gasket semi-finished product is located in the pressing groove. 2, and then the first lifting cylinder 16 drives the slot support 17 to move up, and the mica gasket semi-finished product is pushed out from the inner side of the pressing slot 2, and then the electric push rod 32 drives the guide cover 33 to translate in the direction of the third conveyor belt 8, and the mica gasket semi-finished product is pushed to the top of the third conveyor belt 8, and sent to the next processing link via the third conveyor belt 8. The coordinated use of the above-mentioned structure can effectively avoid the problem of excessive or insufficient force during pressing and shaping, and can ensure that the pressing force is moderate, thereby improving the yield rate of the mica gasket. In addition, the pushing assembly 3 cooperates with the third conveyor belt 8 to realize the unloading operation of the mica gasket semi-finished product and send it to the subsequent processing link, which is helpful to further improve the preparation efficiency of the mica gasket.

[0055] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A fireproof and heat-insulating mica gasket, comprising a gasket body, characterized in that: An upper metal mesh is pressed and fixed on the top of the gasket body, and a lower metal mesh is pressed and fixed on the bottom of the gasket body. The gasket body is formed by mixing and pressing mica powder, high-temperature resistant resin glue, refractory fiber and flame retardant, and the mass ratio of mica powder, high-temperature resistant resin glue, refractory fiber and flame retardant is 5.5:2.5:1.2:0.

8.

2. A method for preparing a fireproof and heat-insulating mica gasket, applied to the fireproof and heat-insulating mica gasket as claimed in claim 1, characterized in that: The following steps are involved: S1. Raw material preparation: Select high-quality mica ore as raw material, and obtain mica powder that meets the requirements through crushing and screening; S2, raw material mixing: put mica powder, high temperature resistant resin glue, refractory fiber, and flame retardant into a mixing bin (5) and mix them evenly for later use; S3, rotary loading: the lower metal mesh is conveyed into the pressing trough (2) by the first conveyor belt (6), and then the processing seat (1) is rotated 90 degrees counterclockwise, and the material in the mixing bin (5) is conveyed into the pressing trough (2) by the transverse auger (4), and then the processing seat (1) is rotated 90 degrees counterclockwise again, and the upper metal mesh is conveyed into the pressing trough (2) by the second conveyor belt (7), and then the processing seat (1) is rotated 90 degrees counterclockwise, and the pressing trough (2) is rotated to be directly below the pressing assembly (9); S4, pressing and forming: pressing the lower metal mesh, the mixed material and the upper metal mesh in the pressing tank (2) by means of a pressing component (9) to obtain a mica gasket semi-finished product; after the mica gasket semi-finished product is ejected from the pressing tank (2), the pushing component (3) pushes the mica gasket semi-finished product onto a third conveyor belt (8) to be conveyed to the next processing step; S5. Curing treatment: The pressed gasket semi-finished product is cured to improve its fire-resistant, heat-insulating and mechanical strength.

3. The method for preparing a fireproof and heat-insulating mica gasket according to claim 2, characterized in that: The processing seat (1) comprises a fixed base (11), an annular groove (12), a servo motor (13) and a movable disk (14); the top of the fixed base (11) is provided with an annular groove (12); the servo motor (13) is fixedly mounted at the top center position of the fixed base (11); and the output shaft of the servo motor (13) is fixedly connected to the movable disk (14) via a coupling.

4. The method for preparing a fireproof and heat-insulating mica gasket according to claim 3, characterized in that: The processing seat (1) includes a supporting slide bar (15), the top end of which is fixedly connected to the bottom of the movable disk (14), and the supporting slide bars (15) are arranged equidistantly in a circular array, the bottom size of the supporting slide bar (15) is completely consistent with the internal size of the annular groove (12), and the movable disk (14) forms a sliding structure with the fixed base (11) through the supporting slide bar (15) and the annular groove (12).

5. The method for preparing a fireproof and heat-insulating mica gasket according to claim 3, characterized in that: The processing seat (1) also includes a first lifting cylinder (16), a slot support (17), a cross (18) and a top seat (19); the first lifting cylinder (16) is fixedly installed on the top of the movable disk (14), and the top of the lifting cylinder (16) is fixedly connected to the slot support (17); the top of the movable disk (14) is fixedly connected to the cross (18), and the top of the cross (18) is fixedly connected to the top seat (19); and the top seat (19) is fixed directly above the movable disk (14) through the cross (18).

6. The method for preparing a fireproof and heat-insulating mica gasket according to claim 5, characterized in that: The number of the pressing grooves (2) and the number of the first lifting cylinders (16) are both four, and the four pressing grooves (2) and the four first lifting cylinders (16) are arranged in a one-to-one correspondence, and the shape and size of the pressing grooves (2) and the shape and size of the groove support (17) match each other, and the groove support (17) is located inside the pressing groove (2).

7. The method for preparing a fireproof and heat-insulating mica gasket according to claim 2, characterized in that: The push assembly (3) comprises a fixed seat body (31), an electric push rod (32) and a guide cover (33); the fixed seat body (31) is fixed at the top center position of the top seat (19), and the outer wall of the fixed seat body (31) is fixedly connected to the electric push rod (32), and one end of the electric push rod (32) is fixedly connected to the guide cover (33).

8. The method for preparing a fireproof and heat-insulating mica gasket according to claim 7, characterized in that: The number of the electric push rods (32) is four, and the included angle between two adjacent electric push rods (32) is ninety degrees.

9. The method for preparing a fireproof and heat-insulating mica gasket according to claim 2, characterized in that: The material pressing assembly (9) comprises a second lifting cylinder (91), a fixed plate (92) and a pressure sensor (93); the bottom end of the second lifting cylinder (91) is fixedly connected to the fixed plate (92), and the pressure sensor (93) is installed at the bottom of the fixed plate (92).

10. The method for preparing a fireproof and heat-insulating mica gasket according to claim 9, characterized in that: The pressing assembly (9) also includes a spring (94), a pressing plate (95) and a guide rod (96), the top end of the spring (94) is fixedly connected to the bottom of the fixed plate (92), and the bottom end of the spring (94) is fixedly connected to the pressing plate (95), the top of the pressing plate (95) is vertically fixed with a guide rod (96), and the guide rod (96) passes through the inner center of the spring (94) and forms a through structure with the fixed plate (92).

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