Test tool for simulating assembly of vehicle-mounted host and printed circuit board

Abstract

The utility model relates to the technical field of printed circuit board testing, in particular to a testing tool for simulating assembly of a vehicle-mounted host and a printed circuit board. The test tool is used for installing and connecting the main board and the sub-board; the testing tool comprises a top plate, a middle plate and a bottom plate which are sequentially arranged from top to bottom, the bottom plate is provided with a main plate positioning assembly used for positioning a main plate, the middle plate is provided with a sub-plate positioning assembly used for positioning a sub-plate, the middle plate is further provided with an avoiding through hole allowing the sub-plate to partially penetrate through, and the testing tool further comprises at least two sets of locking assemblies. The top plate and the middle plate are locked through a locking assembly, and the middle plate and the bottom plate are locked through a locking assembly. The utility model aims to overcome the defect that in the prior art, two printed circuit boards which are connected and matched with each other cannot be subjected to comprehensive function test before installation, and provides a test tool for simulating the assembly of a vehicle-mounted host and a printed circuit board, so that the two printed circuit boards can be subjected to comprehensive function test before installation.

Description

Technical Field

[0001] This utility model relates to the field of printed circuit board testing technology, and more specifically, to a testing fixture for simulating the assembly of a vehicle-mounted host and a printed circuit board. Background Technology

[0002] The rapid development of automotive audio-visual systems, with their increasing functionality, has made the functional testing of printed circuit boards (PCBs) before they leave the factory increasingly complex. During production, some functions may reside on different PCBs, requiring the assembly and connection of two PCBs before functional testing can be performed to complete all necessary tests. Previously, the lack of a main hardware component prevented the installation of two PCBs, thus hindering comprehensive functional testing before assembly. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies that cannot perform comprehensive functional testing on two connected printed circuit boards before installation. It provides a test fixture that simulates the assembly of a vehicle host and a printed circuit board, which can perform comprehensive functional testing on the two printed circuit boards before installation.

[0004] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0005] A test fixture is provided to simulate the assembly of a vehicle-mounted host and a printed circuit board. The test fixture is used to install and connect a motherboard and a daughterboard. The test fixture includes a top plate, a middle plate, and a bottom plate arranged sequentially from top to bottom. The bottom plate is provided with a motherboard positioning component for positioning the motherboard. The middle plate is provided with a daughterboard positioning component for positioning the daughterboard. The middle plate is also provided with a clearance through hole for the daughterboard to pass through. It also includes at least two sets of locking components. The top plate and the middle plate, and the middle plate and the bottom plate are locked together by the locking components.

[0006] This utility model's testing fixture can assemble and connect the motherboard and daughterboard to simulate the state of the motherboard and daughterboard installed in a host computer, and then perform comprehensive functional tests on the motherboard and daughterboard. Specifically, the motherboard is mounted on the base plate, and the daughterboard is mounted on the middle plate. At the same time, through-holes are used to allow part of the daughterboard to pass through the middle plate and plug into the motherboard to achieve the connection between the motherboard and daughterboard. Then, a locking assembly is used to lock and fix the middle plate to the base plate. In order to prevent the daughterboard from moving during the test, a top plate is also provided on top of the daughterboard. The top plate is locked and fixed to the middle plate using a locking assembly. This ensures that the position of the motherboard and daughterboard does not change throughout the entire test. On the one hand, it solves the problem that the relative position of the two boards is not fixed, which is not conducive to testing. On the other hand, it also solves the problem of product scattering during subsequent transportation. More importantly, it allows the two separate printed circuit boards to be installed and connected in a simulated actual use state, which can not only achieve comprehensive testing before installation, but also improve the accuracy of testing.

[0007] Furthermore, the motherboard positioning assembly includes at least two motherboard positioning pins that can be plugged into the motherboard, with the bottom of each motherboard positioning pin connected to the base plate. The two motherboard positioning pins, by plugging into the motherboard, achieve positioning of the motherboard in the X and Y directions, where X and Y refer to two mutually perpendicular directions on the horizontal plane.

[0008] Furthermore, it also includes a plurality of first limiting posts, which are installed at the bottom of the middle plate. The first limiting posts are inserted into and abut against the main board positioning pin. The first limiting posts are used to limit movement in the Z direction, which refers to the height direction, so that the middle plate and the bottom plate maintain a certain distance during the connection and locking process. The insertion depth of the main board and the sub-board can be adjusted by controlling the height of the first limiting posts. Preferably, the first limiting posts abut against the upper surface of the main board plane, so that the components installed on the main board are located within the height space supported by the middle plate and the bottom plate, and are not squeezed by the middle plate, thus protecting the components.

[0009] Furthermore, the sub-board positioning assembly includes at least two sub-board positioning pins that can be inserted into the sub-board, and the bottom of the sub-board positioning pins is connected to the middle plate. The two sub-board positioning pins achieve positioning of the sub-board in the X and Y directions by inserting into the sub-board.

[0010] Furthermore, it also includes a plurality of second limiting posts, which are installed at the bottom of the top plate. The second limiting posts are inserted into and abut against the positioning pins of the sub-plate. The function of the second limiting posts is similar to that of the first limiting posts, used to limit the distance between the top plate and the middle plate, so that the components mounted on the sub-plate are located within the height space supported by the top plate and the middle plate, and are not squeezed by the top plate, thus forming protection for the components.

[0011] Furthermore, it also includes a first positioning component for positioning the top plate and the middle plate, and a second positioning component for positioning the middle plate and the bottom plate. The first positioning component includes a first positioning part and a second positioning part that are interlocked with each other, the first positioning part being installed on the top plate and the second positioning part being installed on the middle plate. The second positioning component includes a third positioning part and a fourth positioning part that are interlocked with each other, the third positioning part being installed on the middle plate and the fourth positioning part being installed on the bottom plate. The first positioning part and the second positioning part are interlocked to achieve positioning of the top plate and the middle plate; the third positioning part and the fourth positioning part are interlocked to achieve positioning of the middle plate and the bottom plate, facilitating good docking of the motherboard and the daughterboard after the middle plate and the bottom plate are installed, in preparation for subsequent performance testing.

[0012] Furthermore, the locking assembly includes a first locking part and a second locking part that can be snapped together. The first locking part is detachably connected to the top plate or the middle plate, and the second locking part is detachably connected to the middle plate or the bottom plate. When the top plate is connected to the middle plate, it is locked by snapping together the first locking part installed on the top plate and the second locking part installed on the middle plate. When the middle plate is connected to the bottom plate, it is locked by snapping together the first locking part installed on the middle plate and the second locking part installed on the bottom plate. The first locking part and the second locking part snap together to lock the top plate and the middle plate, and the middle plate and the bottom plate. Within the knowledge of those skilled in the art, the first locking part and the second locking part can also be locked together by other means, such as threaded connection, or by using the cooperation of bolts and nuts.

[0013] Furthermore, the second locking part is a conical pin; the first locking part includes a housing, an elastic driving part, and a locking steel ball. The elastic driving part is sleeved inside the housing, and the locking steel ball is also movably installed inside the housing and located below the elastic driving part. When the housing is sleeved over the second locking part from top to bottom, causing the locking steel ball to engage with the outside of the second locking part, it is in a locked state; when the elastic driving part is driven to disengage the locking steel ball from the second locking part, it is in an unlocked state. The locking steel ball is used to engage and lock the second locking part, preventing the first locking part from disengaging from the second locking part. The elastic driving part disengages the locking steel ball from the second locking part, at which point the housing can be pulled out to separate the first locking part from the second locking part.

[0014] Furthermore, the elastic driving part includes a pressing member, a driven member, an elastic member, and a driving steel ball, which are arranged sequentially. The pressing member is also sleeved above the driven member. The driven member has a circumferential groove. The elastic member is sleeved on the outside of the driven member. The driven member is also located above the second locking part and the locking steel ball. Pressing the pressing member can compress the elastic member and cause the driving steel ball to move down and engage with the groove. Under the drive of the restoring force, the driving steel ball drives the driven member to move up relative to the pressing member, so that the locking steel ball can disengage from the second locking part under the drive of the outer shell. When force is applied to the pressing component, it acts on the driving steel ball. The driving steel ball moves downward and acts on the driven component, causing the driven component to move upward and simultaneously compressing the elastic component. After the driven component disengages from the clamping steel ball, the clamping steel ball can release the limit on the second locking part. At this time, the outer shell can be pulled upward to disengage the first locking part from the second locking part, thus unlocking the component. After the force applied to the pressing component is released, the driven component will move downward to reset under the restoring force of the elastic component.

[0015] Furthermore, the top plate is provided with a first guide portion, the middle plate is provided with a second guide portion and a third guide portion, and the bottom plate is provided with a fourth guide portion. The first guide portion and the second guide portion are inserted into each other, and the third guide portion and the fourth guide portion are inserted into each other. The insertion of the first guide portion and the second guide portion provides guidance when the top plate and the middle plate are connected. Similarly, the insertion of the third guide portion and the fourth guide portion provides guidance when the middle plate and the bottom plate are connected.

[0016] Furthermore, the top plate, the middle plate, and the bottom plate are all provided with clamping parts on their sides. The clamping parts can be positioning copper sleeves, which facilitate the movement of the top plate, middle plate, and bottom plate by the robot arm during mechanized operation, thereby facilitating the installation and disassembly of the testing fixture.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention can simulate the actual automotive installation environment of printed circuit board motherboards and daughterboards, and thus perform comprehensive functional tests on the motherboards and daughterboards, allowing for timely detection of problems before actual vehicle installation. During the testing process, this invention can ensure that the relative positions of the motherboards and daughterboards are fixed, and that there is a relatively reliable connection between the motherboards and daughterboards, thereby improving the accuracy of the test results. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a test fixture for simulating the assembly of a vehicle-mounted host and a printed circuit board according to the present invention.

[0020] Figure 2 This is a schematic diagram of the structure of a test fixture for simulating the assembly of a vehicle-mounted host and a printed circuit board, after installing the main board and the daughter board and removing the top plate.

[0021] Figure 3 This is a schematic diagram of the structure of the base plate of this utility model after the main board is installed;

[0022] Figure 4 This is a schematic diagram of the structure of a test fixture for simulating the assembly of a vehicle-mounted host and a printed circuit board, after the motherboard and daughterboard are installed.

[0023] Figure 5 for Figure 4 AA section view;

[0024] Figure 6 for Figure 4 BB section view;

[0025] Figure 7 This is a schematic diagram of the structure of the middle plate of this utility model;

[0026] Figure 8 This is a cross-sectional view of the locking assembly;

[0027] Figure 9 This is a schematic diagram showing the installation of the second locking part on the base plate.

[0028] The markings in the diagram are explained below:

[0029] 1. Top plate; 11. Second limiting post; 2. Middle plate; 21. Clearance through hole; 22. First limiting post; 23. Sub-plate positioning pin; 3. Bottom plate; 31. Main plate positioning pin; 4. Locking assembly; 41. First locking part; 411. Outer shell; 412. Pressing part; 413. Driven part; 4131. Slot; 414. Elastic part; 415. Drive steel ball; 416. Clamping steel ball; 42. Second locking part; 5. Clamping part; 6. Main plate; 7. Sub-plate. Detailed Implementation

[0030] The present invention will be further described below with reference to specific embodiments. The accompanying drawings are for illustrative purposes only, representing schematic diagrams rather than actual physical objects, and should not be construed as limiting the scope of this patent. To better illustrate the embodiments of the present invention, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0031] In the accompanying drawings of this utility model, 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.

[0032] Example 1

[0033] like Figures 1 to 7 The image shows a first embodiment of a test fixture for simulating the assembly of a vehicle-mounted main unit and a printed circuit board according to this utility model. Figure 1 As shown, the test fixture is used to install and connect the motherboard 6 and the daughterboard 7. The test fixture includes a top plate 1, a middle plate 2, and a bottom plate 3 arranged sequentially from top to bottom. The bottom plate 3 is provided with a motherboard positioning component for positioning the motherboard 6. The middle plate 2 is provided with a daughterboard positioning component for positioning the daughterboard 7. The middle plate 2 is also provided with a clearance through hole 21 for the daughterboard 7 to pass through. It also includes at least two sets of locking components 4. The top plate 1 and the middle plate 2, and the middle plate 2 and the bottom plate 3 are locked together by the locking components 4.

[0034] The testing fixture of this utility model can assemble the motherboard 6 and the daughterboard 7 and connect them to simulate the state of the motherboard 6 and the daughterboard 7 installed in the host. Then, a comprehensive functional test is performed on the motherboard 6 and the daughterboard 7. Specifically, the motherboard 6 is mounted on the base plate 3 and the daughterboard 7 is mounted on the middle plate 2. At the same time, the daughterboard 7 is partially inserted into the motherboard 6 after passing through the middle plate 2 using the clearance through hole 21 to realize the connection between the motherboard 6 and the daughterboard 7. Then, the middle plate 2 and the base plate 3 are locked and fixed using the locking assembly 4. In order to prevent the position of the daughterboard 7 from moving during the test, a top plate 1 is also covered on the daughterboard 7. The top plate 1 is locked and fixed to the middle plate 2 using the locking assembly 4. This ensures that the position of the motherboard 6 and the daughterboard 7 does not change throughout the test. On the one hand, it solves the problem that the relative position of the two boards is not fixed, which is not conducive to the test. On the other hand, it also solves the problem of the product scattering during subsequent transportation. More importantly, it allows the two separate printed circuit boards to be installed and connected in a simulated actual use state, improving the accuracy of the test.

[0035] As one embodiment of this utility model, such as Figure 3As shown, the motherboard positioning assembly includes at least two motherboard positioning pins 31 that can be plugged into the motherboard 6. The bottom of the motherboard positioning pins 31 is connected to the base plate 3. The two motherboard positioning pins 31 are plugged into the motherboard 6 to achieve the positioning of the motherboard 6 in the X and Y directions, where the X and Y directions refer to two mutually perpendicular directions on the horizontal plane.

[0036] As one embodiment of this utility model, it also includes a plurality of first limiting posts 22, which are installed at the bottom of the middle plate 2. The first limiting posts 22 are inserted into the main plate positioning pin 31 and abut against the main plate 6. The first limiting posts 22 are used to limit the movement in the Z direction, where Z refers to the height direction, so that the middle plate 2 and the bottom plate 3 maintain a certain distance during the connection and locking process. The insertion depth of the main plate 6 and the sub-plate 7 can be adjusted by controlling the height of the first limiting posts 22. Preferably, the first limiting posts 22 abut against the upper surface of the plane of the main plate 6, so that the components installed on the main plate 6 are located within the height space supported by the middle plate 2 and the bottom plate 3, and are not squeezed by the middle plate 2, thus forming protection for the components.

[0037] As one embodiment of this utility model, such as Figure 2 As shown, the sub-board positioning assembly includes at least two sub-board positioning pins 23 that can be inserted into the sub-board 7, and the bottom of the sub-board positioning pins 23 is connected to the middle plate 2. The two sub-board positioning pins 23 are inserted into the sub-board 7 to achieve positioning of the sub-board 7 in the X and Y directions.

[0038] As one embodiment of this utility model, it also includes a plurality of second limiting posts 11, which are installed at the bottom of the top plate 1. The second limiting posts 11 are inserted into the sub-plate positioning pins 23 and abut against the sub-plate 7. The function of the second limiting posts 11 is similar to that of the first limiting posts 22, which is used to limit the distance between the top plate 1 and the middle plate 2, so that the components installed on the sub-plate 7 are located within the height space supported by the top plate 1 and the middle plate 2, and are not squeezed by the top plate 1, thereby protecting the components.

[0039] As one embodiment of this utility model, it also includes a first positioning component for positioning the top plate 1 and the middle plate 2, and a second positioning component for positioning the middle plate 2 and the bottom plate 3. The first positioning component includes a first positioning part and a second positioning part that are interlocked with each other, the first positioning part being installed on the top plate 1 and the second positioning part being installed on the middle plate 2. The second positioning component includes a third positioning part and a fourth positioning part that are interlocked with each other, the third positioning part being installed on the middle plate 2 and the fourth positioning part being installed on the bottom plate 3. The first positioning part and the second positioning part are interlocked to achieve the positioning of the top plate 1 and the middle plate 2; the third positioning part and the fourth positioning part are interlocked to achieve the positioning of the middle plate 2 and the bottom plate 3, so as to facilitate good docking of the main board 6 and the daughter board 7 after the middle plate 2 and the bottom plate 3 are installed, in preparation for subsequent performance testing. As one preferred option, the first and second positioning parts can be omitted, and the second limiting post 11 can be used as the first positioning part, and the sub-plate positioning pin 23 can be used as the second positioning part, for positioning when the top plate 1 and the middle plate 2 are inserted; similarly, the third and fourth positioning parts can be omitted, and the first limiting post 22 can be used as the third positioning part, and the main plate positioning pin 31 can be used as the fourth positioning part, for positioning when the middle plate 2 and the bottom plate 3 are inserted.

[0040] In one embodiment of this utility model, the top plate 1 is provided with a first guide portion, the middle plate 2 is provided with a second guide portion and a third guide portion, and the bottom plate 3 is provided with a fourth guide portion. The first guide portion is inserted into the second guide portion, and the third guide portion is inserted into the fourth guide portion. The insertion of the first guide portion into the second guide portion provides guidance when the top plate 1 and the middle plate 2 are connected. Similarly, the insertion of the third guide portion into the fourth guide portion provides guidance when the middle plate 2 and the bottom plate 3 are connected. As a preferred embodiment, the first guide portion and the second guide portion can be omitted, and the second limiting post 11 can be used as the first guide portion, and the sub-plate positioning pin 23 can be used as the second guide portion to provide guidance when the top plate 1 and the middle plate 2 are connected. Similarly, the third guide portion and the fourth guide portion can be omitted, and the first limiting post 22 can be used as the third guide portion, and the main plate positioning pin 31 can be used as the fourth guide portion to provide guidance when the middle plate 2 and the bottom plate 3 are connected.

[0041] Example 2

[0042] The following is a second embodiment of a test fixture for simulating the assembly of a vehicle-mounted main unit and a printed circuit board according to this utility model. This embodiment is similar to embodiment 1, as follows: Figure 8 and Figure 9As shown, the locking assembly 4 includes a first locking part 41 and a second locking part 42 that can be snapped together. The first locking part 41 is detachably connected to the top plate 1 or the middle plate 2, and the second locking part 42 is detachably connected to the middle plate 2 or the bottom plate 3. When the top plate 1 is connected to the middle plate 2, it is locked by snapping together the first locking part 41 installed on the top plate 1 and the second locking part 42 installed on the middle plate 2. When the middle plate 2 is connected to the bottom plate 3, it is locked by snapping together the first locking part 41 installed on the middle plate 2 and the second locking part 42 installed on the bottom plate 3. The first locking part 41 and the second locking part 42 snap together to lock the top plate 1 to the middle plate 2 and the middle plate 2 to the bottom plate 3. Within the knowledge of those skilled in the art, the first locking part 41 and the second locking part 42 can also be locked together by other means, such as threaded connection or by using the cooperation of bolts and nuts.

[0043] In one embodiment of this utility model, the second locking part 42 is a conical pin; the first locking part 41 includes a housing 411, an elastic driving part, and a clamping steel ball 416. The elastic driving part is sleeved inside the housing 411, and the clamping steel ball 416 is also movably installed inside the housing 411 and located below the elastic driving part. When the housing 411 is sleeved from top to bottom outside the second locking part 42, causing the clamping steel ball 416 to engage with the outside of the second locking part 42, it is in a locked state; when the elastic driving part is driven to disengage the clamping steel ball 416 from the second locking part 42, it is in an unlocked state. The clamping steel ball 416 is used to engage and lock the second locking part 42 to prevent the first locking part 41 from disengaging from the second locking part 42. The elastic driving part disengages the clamping steel ball 416 from the second locking part 42, at which point the housing 411 can be pulled out to separate the first locking part 41 from the second locking part 42.

[0044] In one embodiment of this utility model, the elastic drive unit includes a pressing member 412, a driven member 413, an elastic member 414, and a driving steel ball 415. The pressing member 412, the driving steel ball 415, and the elastic member 414 are arranged in sequence. The pressing member 412 is also sleeved above the driven member 413. The driven member 413 is provided with a groove 4131 around its circumference. The elastic member 414 is sleeved on the outside of the driven member 413. The driven member 413 is also located above the second locking part 42 and the clamping steel ball 416. Pressing the pressing member 412 can compress the elastic member 414 and cause the driving steel ball 415 to move down and engage with the groove 4131. Under the drive of the restoring force, the driving steel ball 415 drives the driven member 413 to move up relative to the pressing member 412, so that the clamping steel ball 416 can be disengaged from the second locking part 42 under the drive of the outer shell 411. Force is applied to the pressing member 412, causing it to act on the driving steel ball 415. The driving steel ball 415 moves downward, acting on the driven member 413, causing the driven member 413 to move upward and simultaneously compressing the elastic member 414. After the driven member 413 disengages from the clamping steel ball 416, the clamping steel ball 416 can release the restriction on the second locking part 42. At this time, the outer shell 411 can be pulled upward to disengage the first locking part 41 from the second locking part 42, thus unlocking the device. After the force applied to the pressing member 412 is released, the driven member 413 will move downward to reset under the restoring force of the elastic member 414.

[0045] Example 3

[0046] The following is a third embodiment of the test fixture for simulating the assembly of a vehicle-mounted host and a printed circuit board according to this utility model. This embodiment is similar to embodiment 1, except that the top plate 1, the middle plate 2, and the bottom side are all provided with clamping parts 5. The clamping parts 5 can be positioning copper sleeves, which facilitate the movement of the top plate 1, the middle plate 2, and the bottom plate 3 by the robot arm through the clamping parts 5 during mechanized operation, thereby facilitating the installation and disassembly of the test fixture.

[0047] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating this utility model, and are not intended to limit the implementation of this utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A test fixture for simulating the assembly of a vehicle-mounted host computer and a printed circuit board, the test fixture being used to install and connect a motherboard (6) and a daughterboard (7); characterized in that, The test fixture includes a top plate (1), a middle plate (2), and a bottom plate (3) arranged sequentially from top to bottom. The bottom plate (3) is provided with a motherboard positioning component for positioning the motherboard (6). The middle plate (2) is provided with a sub-board positioning component for positioning the sub-board (7). The middle plate (2) is also provided with a clearance through hole (21) through which the sub-board (7) passes. It also includes at least two sets of locking components (4). The top plate (1) and the middle plate (2), and the middle plate (2) and the bottom plate (3) are locked together by the locking components (4).

2. The test fixture for assembling a simulated vehicle-mounted host computer and a printed circuit board according to claim 1, characterized in that, The motherboard positioning assembly includes at least two motherboard positioning pins (31) that can be plugged into the motherboard (6), and the bottom of the motherboard positioning pins (31) is connected to the base plate (3).

3. The test fixture for assembling a simulated vehicle-mounted host computer and a printed circuit board according to claim 2, characterized in that, It also includes a number of first limiting posts (22), which are installed at the bottom of the middle plate (2). The first limiting posts (22) are inserted into the main board positioning pin (31) and abut against the main board (6).

4. The test fixture for simulating the assembly of an on-board host and a printed circuit board according to claim 1, characterized in that, The sub-plate positioning assembly includes at least two sub-plate positioning pins (23) that can be inserted into the sub-plate (7), and the bottom of the sub-plate positioning pins (23) is connected to the middle plate (2).

5. The test fixture for simulating the assembly of an on-board host and a printed circuit board according to claim 4, characterized in that, It also includes a number of second limiting posts (11), which are installed at the bottom of the top plate (1). The second limiting posts (11) are inserted into the sub-plate positioning pin (23) and abut against the sub-plate (7).

6. The test fixture for assembling a simulated vehicle-mounted host computer and a printed circuit board according to claim 1, characterized in that, It also includes a first positioning component for positioning the top plate (1) and the middle plate (2), and a second positioning component for positioning the middle plate (2) and the bottom plate (3); the first positioning component includes a first positioning part and a second positioning part that are inserted into each other, the first positioning part being installed on the top plate (1) and the second positioning part being installed on the middle plate (2); the second positioning component includes a third positioning part and a fourth positioning part that are inserted into each other, the third positioning part being installed on the middle plate (2) and the fourth positioning part being installed on the bottom plate (3).

7. The test fixture for assembling a simulated vehicle-mounted host computer and a printed circuit board according to any one of claims 1 to 6, characterized in that, The locking assembly (4) includes a first locking part (41) and a second locking part (42) that can be snapped together. The first locking part (41) is detachably connected to the top plate (1) or the middle plate (2), and the second locking part (42) is detachably connected to the middle plate (2) or the bottom plate (3). When the top plate (1) is connected to the middle plate (2), the first locking part (41) installed on the top plate (1) and the second locking part (42) installed on the middle plate (2) are snapped together and locked together. When the middle plate (2) is connected to the bottom plate (3), the first locking part (41) installed on the middle plate (2) and the second locking part (42) installed on the bottom plate (3) are snapped together and locked together.

8. The test fixture for assembling a simulated vehicle-mounted host computer and a printed circuit board according to claim 7, characterized in that, The second locking part (42) is a conical pin; the first locking part (41) includes a housing (411), an elastic drive part, and a clamping steel ball (416). The elastic drive part is sleeved inside the housing (411), and the clamping steel ball (416) is also movably installed inside the housing (411) and located below the elastic drive part. When the housing (411) is sleeved from top to bottom outside the second locking part (42) so that the clamping steel ball (416) is clamped on the outside of the second locking part (42), it is in a locked state; when the elastic drive part is driven to make the clamping steel ball (416) disengage from the second locking part (42), it is in an unlocked state.

9. The test fixture for assembling a simulated vehicle-mounted host computer and a printed circuit board according to claim 8, characterized in that, The elastic drive unit includes a pressing member (412), a driven member (413), an elastic member (414), and a driving steel ball (415). The pressing member (412), the driving steel ball (415), and the elastic member (414) are arranged sequentially. The pressing member (412) is also sleeved above the driven member (413). The driven member (413) has a circumferential groove (4131). The elastic member (414) is sleeved on the outside of the driven member (413). The driven member (413) also has... Located above the second locking part (42) and the clamping steel ball (416); pressing the pressing member (412) can compress the elastic member (414) and the driving steel ball (415) moves down and engages with the slot (4131). Under the drive of the restoring force, the driving steel ball (415) drives the driven member (413) to move up relative to the pressing member (412), so that the clamping steel ball (416) can disengage from the second locking part (42) under the drive of the outer shell (411).

10. The test fixture for assembling a simulated vehicle-mounted host computer and a printed circuit board according to claim 9, characterized in that, The top plate (1) is provided with a first guide part, the middle plate (2) is provided with a second guide part and a third guide part, and the bottom plate (3) is provided with a fourth guide part. The first guide part is inserted into the second guide part, and the third guide part is inserted into the fourth guide part.

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