Semi-automatic nut pressing and riveting device for keyboard main shell

Abstract

The utility model relates to the technical field of keyboard main shell nut pressing riveting, and discloses a keyboard main shell semi-automatic nut pressing riveting device which comprises a base, a first riveting pressing structure, a second riveting pressing structure and a shell fixing structure. The shell fixing structure comprises a shell fixing air cylinder and a fixed plate set, the shell fixing air cylinder is used for driving the fixed plate set to abut against and position the keyboard main shell, shell pressing parts are formed on the two sides of the keyboard main shell respectively, the first riveting structure comprises a first riveting block and a first riveting air cylinder, and the second riveting structure comprises a second riveting block and a second riveting air cylinder. The first riveting pressing block and the second riveting pressing block are used for feeding nuts, the first riveting pressing air cylinder is used for driving the first riveting pressing block to move, and the second riveting pressing air cylinder is used for driving the second riveting pressing block to move. Therefore, double-station riveting operation is achieved, the riveting efficiency is improved, meanwhile, the labor efficiency can be greatly improved, linear driving is achieved under the cooperation effect of the first riveting structure and the second riveting structure, and the nut riveting accuracy is improved.

Description

Technical Field

[0001] This utility model patent relates to the technical field of keyboard main shell nut riveting, specifically to a semi-automatic keyboard main shell nut riveting device. Background Technology

[0002] The keyboard can input English letters, numbers, punctuation marks, etc. into the computer, thereby enabling the issuance of commands and the input of data.

[0003] The keyboard includes a main shell. During the production process, nuts need to be riveted to the main shell. Currently, manual riveting is generally used, which is not only inefficient but also results in a low pass rate.

[0004] Common riveting devices are unsuitable for riveting the keyboard housing and nuts. For example, a prior patent with authorization publication number CN203917661U discloses a novel riveting nut machine, including a worktable, a feeding table, and a controller. The feeding table has a push-through hole, and symmetrical feeding and suction holes are arranged on both sides of the push-through hole. A suction rod is installed in the suction hole, and an arc-shaped electromagnetic attraction block is installed on the inner end of the suction rod. A suction cylinder is connected to the outer side of the suction rod. A pressure rod is also installed above the push-through hole, and a hydraulic cylinder is connected to the top of the pressure rod. At least two pressure devices are installed at the bottom of the feeding table. The pressure device includes a pressure cylinder and a pressure plate connected to the bottom of the pressure cylinder. A laser emitter is installed at the end of the pressure rod. A laser through hole is provided on the worktable, and a laser receiver is installed at the bottom of the laser through hole. The laser receiver is connected to the controller.

[0005] In the existing technology, the riveting assembly between the keyboard main shell and the nut is inefficient, time-consuming and labor-intensive, and the accuracy of nut riveting is insufficient. Utility Model Content

[0006] The purpose of this utility model is to provide a semi-automatic nut riveting device for keyboard main shell, which aims to solve the problem of insufficient riveting accuracy between keyboard main shell and nut in the prior art.

[0007] This utility model is implemented as follows: a semi-automatic nut riveting device for keyboard main shell includes a base, a first riveting structure, a second riveting structure, and a fixed shell structure. The first riveting structure, the second riveting structure, and the fixed shell structure are respectively installed on the base, which is used to place the keyboard main shell. The fixed shell structure includes a fixed shell cylinder and a fixed plate assembly. The fixed shell cylinder is used to drive the fixed plate assembly to abut and position the keyboard main shell. Shell pressing parts are formed on both sides of the keyboard main shell. The first riveting structure includes a first riveting block and a first riveting cylinder. The second riveting structure includes a second riveting block and a second riveting cylinder. The first riveting block and the second riveting block are respectively used to feed nuts. The first riveting block and the second riveting block are respectively arranged correspondingly to the shell pressing parts. The first riveting cylinder is used to drive the first riveting block to move in a direction toward or away from the shell pressing parts. The second riveting cylinder is used to drive the second riveting block to move in a direction toward or away from the shell pressing parts.

[0008] Furthermore, the first riveting block includes a first plate connecting segment and a first feeding segment. The first plate connecting segment and the first feeding segment are arranged in a straight line and are integrally formed. The first feeding segment is used to feed nuts, and the first feeding segment extends into the interior of the keyboard main shell and is arranged correspondingly to the shell pressing part.

[0009] Furthermore, the first feeding section includes a plurality of first material pipes, each of which is arranged at intervals. The first material pipes are used to embed nuts, and the pipe wall of the first material pipe is arranged in contact with the outer surface of the nut.

[0010] Furthermore, the first riveting structure includes a first moving plate group and two first transverse moving blocks. The first moving plate group is assembled with the first riveting cylinder, the first plate connecting segment is assembled with the first moving plate group, the first moving plate group and the first transverse moving blocks are stacked vertically, the two first transverse moving blocks are arranged at intervals, the base is provided with two first guide rails, the first guide rails are arranged in a straight line along the direction away from the fixed shell cylinder, and the two first transverse moving blocks are movably assembled with the two first guide rails in a one-to-one correspondence.

[0011] Furthermore, the first moving plate assembly includes a first moving plate body, a first transverse fixing plate, and a first longitudinal fixing plate. The first riveting cylinder has a first cylinder plate. The first transverse fixing plate and the first cylinder plate are arranged in an upper and lower stacked fixed arrangement. Along the axial direction of the first riveting cylinder, the first longitudinal fixing plate and the first cylinder plate are arranged in an stacked arrangement. The upper part of the first longitudinal fixing plate is connected to the first transverse fixing plate, and the lower part of the first longitudinal fixing plate is connected to the first moving plate body. The first moving plate body and the first transverse moving block are arranged in an upper and lower stacked assembly arrangement, and the first plate connecting segment is arranged in an assembly arrangement with the first moving plate body.

[0012] Furthermore, the second riveting structure includes a second moving plate assembly and two second transverse moving blocks. The second moving plate assembly is assembled with the second riveting cylinder, the second plate connecting segment is assembled with the second moving plate assembly, the second moving plate assembly and the second transverse moving blocks are stacked vertically, the two second transverse moving blocks are arranged at intervals, the base is provided with two second guide rails, the second guide rails are arranged in a straight line along the direction away from the fixed housing cylinder, and the two second transverse moving blocks are movably assembled with the two second guide rails in a one-to-one correspondence.

[0013] Furthermore, the positioning stage and the fixed plate group are respectively located between the first moving plate group and the second moving plate group, and the positioning stage and the fixed plate group are respectively used to restrict the first moving plate group from disengaging from the first guide rail, and the positioning stage and the fixed plate group are respectively used to restrict the second moving plate group from disengaging from the second guide rail.

[0014] Furthermore, the base includes a placement platform and a positioning platform. The placement platform has a placement slot for placing the keyboard main shell. The positioning platform is arranged correspondingly to the placement slot and is used to abut against and position the keyboard main shell.

[0015] Furthermore, the fixed plate assembly includes a push plate and a lower fixed plate. The push plate is assembled with the fixed shell cylinder, and the push plate and the lower fixed plate are stacked and assembled. The lower fixed plate is used to abut against and position the keyboard main shell. The lower fixed plate is located above the positioning platform, and the lower fixed plate moves relative to the positioning platform under the thrust.

[0016] Furthermore, the fixed plate assembly includes an upper fixed plate, which is assembled with the lower fixed plate in an upper-lower docking arrangement. The upper fixed plate and the lower fixed plate are subjected to a pushing force to synchronously abut and position the keyboard main shell.

[0017] Compared with the prior art, the semi-automatic nut riveting device for the keyboard main shell provided by this utility model first loads the keyboard main shell onto the base, and loads the nut onto the first riveting block and the second riveting block. Then, the fixed shell cylinder drives the fixed plate group to move until the fixed plate group abuts against the keyboard main shell, thereby positioning the keyboard main shell. Next, the first riveting cylinder and the second riveting cylinder are activated, respectively driving the first riveting block and the second riveting block to move toward the shell pressing part until the nut is riveted to the shell pressing part, thereby realizing the automatic riveting of the nut. In this way, the dual-station riveting operation helps to improve riveting efficiency and also greatly improves manual labor efficiency. Furthermore, under the combined action of the first riveting structure and the second riveting structure, linear drive is achieved, improving the accuracy of nut riveting. Attached Figure Description

[0018] Figure 1This is a three-dimensional schematic diagram of the semi-automatic nut riveting device for the keyboard main shell provided by this utility model;

[0019] Figure 2 This is a three-dimensional schematic diagram of the first riveting structure of the semi-automatic nut riveting device for the keyboard main shell provided by this utility model;

[0020] Figure 3 This is a three-dimensional schematic diagram of the first riveting block of the semi-automatic nut riveting device for the keyboard main shell provided by this utility model;

[0021] Figure 4 This is a three-dimensional schematic diagram of the fit between the fixed shell structure and the base of the semi-automatic nut riveting device for the keyboard main shell provided by this utility model. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0023] The implementation of this utility model will be described in detail below with reference to specific embodiments.

[0024] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this utility model, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the 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, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this patent. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0025] Reference Figure 1-4 The image shown is a preferred embodiment of the present invention.

[0026] A semi-automatic nut riveting device for keyboard main shell includes a base 2, a first riveting structure 1, a second riveting structure 3, and a fixed shell structure 4. The first riveting structure 1, the second riveting structure 3, and the fixed shell structure 4 are respectively installed on the base 2, which is used to place the keyboard main shell 5. The fixed shell structure 4 includes a fixed shell cylinder 41 and a fixed plate assembly. The fixed shell cylinder 41 is used to drive the fixed plate assembly to abut and position the keyboard main shell 5. Shell pressing parts are formed on both sides of the keyboard main shell 5. The first riveting structure 1 includes a first riveting block 11 and a first riveting cylinder 12. The second riveting structure 3 includes a second riveting block and a second riveting cylinder. The first riveting block 11 and the second riveting block are respectively used to feed nuts. The first riveting block 11 and the second riveting block are respectively arranged corresponding to the shell pressing parts. The first riveting cylinder 12 is used to drive the first riveting block 11 to move in a direction toward or away from the shell pressing parts. The second riveting cylinder is used to drive the second riveting block to move in a direction toward or away from the shell pressing parts.

[0027] In the aforementioned semi-automatic nut riveting device for the keyboard main shell, the keyboard main shell 5 is first loaded onto the base 2, and the nut is loaded onto the first riveting block 11 and the second riveting block. Then, the fixed shell cylinder 41 drives the fixed plate group to move until the fixed plate group abuts against the keyboard main shell 5, thereby positioning the keyboard main shell 5. Next, the first riveting cylinder 12 and the second riveting cylinder are activated, respectively driving the first riveting block 11 and the second riveting block to move toward the shell pressing part until the nut is riveted to the shell pressing part, thus achieving automatic riveting of the nut. In this way, the dual-station riveting operation helps to improve riveting efficiency and also greatly improves manual labor efficiency. Furthermore, under the combined action of the first riveting structure 1 and the second riveting structure 3, linear drive is achieved, improving the accuracy of nut riveting.

[0028] The first riveting block 11 includes a first plate connecting section 111 and a first feeding section 112. The first plate connecting section 111 and the first feeding section 112 are arranged in a straight line and are integrally formed. The first feeding section 112 is used to feed nuts, and the first feeding section 112 extends into the interior of the keyboard main shell 5 and is arranged corresponding to the shell pressing part. In this way, under the action of the first feeding section 112, it is convenient to feed nuts and also convenient to align nuts with shell pressing parts, thereby facilitating the riveting operation of nuts.

[0029] The first feeding section 112 includes multiple first material pipes 113, which are arranged at intervals. The first material pipes 113 are used to embed nuts, and the pipe wall of the first material pipe 113 is arranged in contact with the outer surface of the nut. Under the action of each first material pipe 113, multiple nuts are fed, thereby enabling multiple nuts to be riveted simultaneously and improving riveting efficiency.

[0030] The end of the first feed tube 113 is magnetic. The end of the first feed tube 113 is used to attract nuts, improve the stability of nut feeding, and prevent the nuts from accidentally falling off the first feed tube 113 during the transfer process, thus ensuring subsequent riveting operations.

[0031] The first riveting structure 1 includes a first moving plate assembly 13 and two first transverse moving blocks 14. The first moving plate assembly 13 is assembled with the first riveting cylinder 12. The first plate connecting segment 111 is assembled with the first moving plate assembly 13. The first moving plate assembly 13 and the first transverse moving blocks 14 are stacked vertically. The two first transverse moving blocks 14 are arranged at intervals. The base 2 is provided with two first guide rails 21. The first guide rails 21 are arranged in a straight line along the direction away from the fixed shell cylinder 41. The two first transverse moving blocks 14 and the two first guide rails 21 are arranged in a one-to-one corresponding movable assembly.

[0032] In this way, under the constraint of the first track, the first moving plate group 13 moves in a straight line to ensure the alignment effect between the nut and the shell pressing part. At the same time, the two first transverse moving blocks 14 cooperate to limit the offset, thereby improving the riveting accuracy of the nut.

[0033] The first moving plate assembly 13 includes a first moving plate body, a first horizontal fixed plate, and a first vertical fixed plate. The first riveting cylinder 12 has a first cylinder plate. The first horizontal fixed plate and the first cylinder plate are arranged in an upper and lower stacked fixed arrangement. Along the axial direction of the first riveting cylinder 12, the first vertical fixed plate and the first cylinder plate are arranged in an upper stacked arrangement. The upper part of the first vertical fixed plate is connected to the first horizontal fixed plate, and the lower part of the first vertical fixed plate is connected to the first moving plate body. The first moving plate body and the first horizontal moving block 14 are arranged in an upper and lower stacked assembly arrangement. The first plate connecting segment 111 is arranged in an assembly arrangement with the first moving plate body.

[0034] In this way, the cooperation of the first horizontal and the first vertical plates enhances the assembly stability with the first riveting cylinder 12, making it easier for the first riveting cylinder 12 to apply driving force to the first moving plate body, thereby riveting the nut to the keyboard main shell 5.

[0035] The second riveting block includes a second plate connecting section and a second feeding section. The second plate connecting section and the second feeding section are aligned in a straight line and are arranged as two separate parts. The second feeding section is used to feed nuts and extends into the interior of the keyboard main shell 5, corresponding to the shell pressing part. In this way, the second feeding section facilitates the feeding of nuts and the alignment of nuts with the shell pressing part, thereby facilitating the riveting operation of nuts.

[0036] The second feeding section includes multiple second feeding pipes, which are arranged at intervals. The interior of each second feeding pipe forms a second cavity for placing nuts. The cavity wall of the second cavity is arranged in contact with the outer surface of the nut. Under the action of each second feeding pipe, multiple nuts are fed, thereby enabling multiple nuts to be riveted simultaneously, improving riveting efficiency.

[0037] The end of the second feed tube is magnetic. The end of the second feed tube is used to attract the nut, improve the stability of the nut feeding, and prevent the nut from accidentally falling off the second feed tube during the transfer process, thus ensuring the subsequent riveting operation.

[0038] The second riveting structure 3 includes a second moving plate assembly and two second transverse moving blocks. The second moving plate assembly is assembled with the second riveting cylinder, the second plate connecting segment is assembled with the second moving plate assembly, the second moving plate assembly and the second transverse moving blocks are stacked vertically, and the two second transverse moving blocks are arranged at intervals. The base 2 is provided with two second guide rails, which are arranged in a straight line along the direction away from the fixed shell cylinder 41. The two second transverse moving blocks and the two second guide rails are arranged in a one-to-one corresponding movable assembly.

[0039] In this way, under the constraint of the second track, the second moving plate group moves in a straight line, ensuring the alignment effect between the nut and the shell pressing part. At the same time, the two second transverse moving blocks cooperate to limit the offset, thereby improving the riveting accuracy of the nut.

[0040] The second moving plate assembly includes a second moving plate body, a second transverse fixing plate, and a second longitudinal fixing plate. The second riveting cylinder has a second cylinder plate. The second transverse fixing plate and the second cylinder plate are arranged in an upper and lower stacked fixed arrangement. Along the axial direction of the second riveting cylinder, the second longitudinal fixing plate and the second cylinder plate are arranged in an stacked arrangement. The upper part of the second longitudinal fixing plate is connected to the second transverse fixing plate, and the lower part of the second longitudinal fixing plate is connected to the second moving plate body. The second moving plate body and the second transverse moving block are arranged in an upper and lower stacked assembly arrangement. The second plate connecting segment is arranged in an assembly arrangement with the second moving plate body.

[0041] In this way, the cooperation of the second horizontal and the second vertical fixed plates enhances the assembly stability with the second riveting cylinder, making it easier for the second riveting cylinder to apply driving force to the second moving plate body, thereby riveting the nut to the keyboard main shell 5.

[0042] The positioning table 23 and the fixed plate group are respectively located between the first moving plate group 13 and the second moving plate group. The positioning table 23 and the fixed plate group are used to restrict the first moving plate group 13 from disengaging from the first guide rail 21, and the positioning table 23 and the fixed plate group are used to restrict the second moving plate group from disengaging from the second guide rail. In this way, the excessive movement of the first moving plate group 13 or the second moving plate group can be avoided to prevent derailment. This ensures the assembly stability of the first moving plate group 13 and the first guide rail 21, as well as the assembly stability of the second moving plate group and the second guide rail.

[0043] The base 2 includes a placement platform 22 and a positioning platform 23. The placement platform 22 has a placement slot for placing the keyboard main shell 5. The positioning platform 23 is arranged correspondingly to the placement slot and is used to abut against and position the keyboard main shell 5. In this way, the cooperation between the placement slot and the positioning platform 23 enhances the stability of the keyboard main shell 5 during loading and effectively prevents the keyboard main shell 5 from shaking during riveting operations, thereby further improving the riveting accuracy.

[0044] The fixed plate assembly includes a push plate 42 and a lower fixed plate 43. The push plate 42 is assembled with the fixed shell cylinder 41, and the push plate 42 and the lower fixed plate 43 are stacked and assembled. The lower fixed plate 43 is used to abut against and position the keyboard main shell 5. The lower fixed plate 43 is located above the positioning platform 23, and the lower fixed plate 43 is moved relative to the positioning by the pushing force.

[0045] In this way, the push plate 42 applies a pushing force, thereby driving the lower plate 43. The lower plate 43 enhances the positioning effect of the keyboard main shell 5, preventing the keyboard main shell 5 from shaking during the riveting operation and improving the riveting accuracy. At the same time, the push plate 42 and the lower plate 43 have a large contact area, which improves the driving stability of the push plate 42 on the lower plate 43.

[0046] The mounting plate assembly includes an upper mounting plate 44, which is assembled with a lower mounting plate 43. The upper mounting plate 44 and the lower mounting plate 43 are pushed together to synchronously abut and position the keyboard main shell 5. In this way, with the cooperation of the placement platform 22, the positioning platform 23, the upper mounting plate 44 and the lower mounting plate 43, the keyboard main shell 5 is positioned and limited in all directions, which improves the positioning effect of the keyboard main shell 5 and effectively prevents the keyboard main shell 5 from shaking during the riveting operation, thereby improving the riveting accuracy.

[0047] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A semi-automatic nut riveting device for keyboard main shell, characterized in that, The keyboard includes a base, a first riveting structure, a second riveting structure, and a fixed shell structure. The first riveting structure, the second riveting structure, and the fixed shell structure are respectively installed on the base, which is used to place the main keyboard shell. The fixed shell structure includes a fixed shell cylinder and a fixed plate assembly. The fixed shell cylinder is used to drive the fixed plate assembly to abut and position the main keyboard shell. Shell pressing parts are formed on both sides of the main keyboard shell. The first riveting structure includes a first riveting block and a first riveting cylinder. The second riveting structure includes a second riveting block and a second riveting cylinder. The first riveting block and the second riveting block are respectively used to feed nuts. The first riveting block and the second riveting block are respectively arranged corresponding to the shell pressing parts. The first riveting cylinder is used to drive the first riveting block to move in a direction toward or away from the shell pressing parts. The second riveting cylinder is used to drive the second riveting block to move in a direction toward or away from the shell pressing parts.

2. The semi-automatic nut riveting device for the keyboard main shell as described in claim 1, characterized in that, The first rivet block includes a first plate connecting section and a first feeding section. The first plate connecting section and the first feeding section are arranged in a straight line and are integrally formed. The first feeding section is used to feed nuts and extends into the interior of the keyboard main shell, corresponding to the shell pressing part.

3. The semi-automatic nut riveting device for the keyboard main shell as described in claim 2, characterized in that, The first feeding section includes multiple first material pipes, which are arranged at intervals. The first material pipes are used to embed nuts, and the pipe wall of the first material pipe is arranged in contact with the outer surface of the nut.

4. The semi-automatic nut riveting device for the keyboard main shell as described in claim 2, characterized in that, The first riveting structure includes a first moving plate group and two first transverse moving blocks. The first moving plate group is assembled with the first riveting cylinder. The first plate connecting segment is assembled with the first moving plate group. The first moving plate group and the first transverse moving blocks are stacked vertically. The two first transverse moving blocks are arranged at intervals. The base is provided with two first guide rails. The first guide rails are arranged in a straight line along the direction away from the fixed shell cylinder. The two first transverse moving blocks are movably assembled with the two first guide rails in a one-to-one correspondence.

5. The semi-automatic nut riveting device for the keyboard main shell as described in claim 4, characterized in that, The first moving plate assembly includes a first moving plate body, a first transverse fixing plate, and a first longitudinal fixing plate. The first riveting cylinder has a first cylinder plate. The first transverse fixing plate and the first cylinder plate are arranged in an upper and lower stacked fixed arrangement. Along the axial direction of the first riveting cylinder, the first longitudinal fixing plate and the first cylinder plate are arranged in an upper stacked arrangement. The upper part of the first longitudinal fixing plate is connected to the first transverse fixing plate, and the lower part of the first longitudinal fixing plate is connected to the first moving plate body. The first moving plate body and the first transverse moving block are arranged in an upper and lower stacked assembly arrangement. The first plate connecting segment is arranged in an assembly arrangement with the first moving plate body.

6. The semi-automatic nut riveting device for the keyboard main shell as described in claim 4, characterized in that, The second riveting structure includes a second moving plate assembly and two second transverse moving blocks. The second moving plate assembly is assembled with the second riveting cylinder. The second plate connecting segment is assembled with the second moving plate assembly. The second moving plate assembly and the second transverse moving blocks are stacked vertically. The two second transverse moving blocks are arranged at intervals. The base is provided with two second guide rails. The second guide rails are arranged in a straight line away from the fixed housing cylinder. The two second transverse moving blocks are arranged in a one-to-one corresponding movable assembly with the two second guide rails.

7. The semi-automatic nut riveting device for the keyboard main shell as described in claim 6, characterized in that, The positioning stage and the fixed plate group are respectively located between the first moving plate group and the second moving plate group, and the positioning stage and the fixed plate group are respectively used to restrict the first moving plate group from disengaging from the first guide rail, and the positioning stage and the fixed plate group are respectively used to restrict the second moving plate group from disengaging from the second guide rail.

8. The semi-automatic nut riveting device for the keyboard main shell as described in any one of claims 1-7, characterized in that, The base includes a placement platform and a positioning platform. The placement platform has a placement slot for placing the keyboard main shell. The positioning platform is arranged correspondingly to the placement slot and is used to abut against and position the keyboard main shell.

9. The semi-automatic nut riveting device for the keyboard main shell as described in claim 8, characterized in that, The fixed plate assembly includes a push plate and a lower fixed plate. The push plate is assembled with the fixed shell cylinder, and the push plate and the lower fixed plate are stacked and assembled. The lower fixed plate is used to abut against and position the keyboard main shell. The lower fixed plate is located above the positioning platform, and the lower fixed plate moves relative to the positioning platform under the thrust.

10. The semi-automatic nut riveting device for the keyboard main shell as described in claim 9, characterized in that, The fixed plate assembly includes an upper fixed plate, which is assembled with the lower fixed plate in an upper and lower docking arrangement. The upper fixed plate and the lower fixed plate are pushed by a force to synchronously abut and position the keyboard main shell.

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