CN218725346U

CN218725346U - Test bench for adjusting vehicle seat

Info

Publication number: CN218725346U
Application number: CN202222689893.8U
Authority: CN
Inventors: 刘竹清; 袁保国; 王梦璐
Original assignee: Beijing Chehejia Automobile Technology Co Ltd
Current assignee: Beijing Chehejia Automobile Technology Co Ltd
Priority date: 2022-10-12
Filing date: 2022-10-12
Publication date: 2023-03-24
Anticipated expiration: 2032-10-12

Abstract

The utility model discloses a test bench for vehicle seat adjusts belongs to vehicle test technical field. The test bench comprises a bench body, a front-row seat adjusting part and a rear-row seat adjusting part, wherein the front-row seat adjusting part and the rear-row seat adjusting part are arranged on the bench body; the front-row seat adjusting part and the rear-row seat adjusting part respectively comprise an X-direction adjusting unit, a Y-direction adjusting unit and a Z-direction adjusting unit, the Z-direction adjusting unit is located at the lower side of the rack body, and the X-direction adjusting unit and the Y-direction adjusting unit are located at the upper side of the Z-direction adjusting unit. The utility model provides a current vehicle seat test rack to vehicle seat travelling comfort evaluation comprehensive problem inadequately.

Description

Test bench for adjusting vehicle seat

Technical Field

The utility model relates to a vehicle test technical field, in particular to a test rack for vehicle seat adjusts.

Background

With the rapid development of the automobile market and the improvement of the living standard of people, vehicles are popularized to common families, and the comfort becomes an important reference factor for purchasing the vehicles. In recent years, in order to meet the requirements of people, great manpower and material resources are put into automobile design, and the automobile is improved in the aspects of comfort, internal space and the like, so that the requirements of people on the comfort of the automobile are met.

Among them, the comfort of the car seat is an important factor for measuring the comfort of the car. Typically, a vehicle enterprise will perform an evaluation test on the vehicle during its design phase. The existing vehicle seat comfort verification usually carries out the verification of a main driving seat, and the position relation adjustment between the seat and other operation and control mechanisms such as a steering wheel, a brake pedal and an accelerator pedal is realized by carrying out X-direction, Y-direction and Z-direction adjustment on the seat. For example, chinese patent CN211292009U provides an operation console for vehicle testing, which includes a vehicle seat adjusting mechanism including an X-direction adjusting portion, a Y-direction adjusting portion, and a Z-direction adjusting portion, wherein the X-direction adjusting portion and the Y-direction adjusting portion are constituted by rail slider mechanisms; the Z-direction adjusting part is driven by a screw jack to move up and down. The vehicle test operating platform can realize the X-direction, Y-direction and Z-direction adjustment of the seat. However, this console involves only the adjustment of the main driver seat, which does not involve the adjustment of the positional relationship between other seats of the vehicle, in particular the rear seat and the front seat; resulting in an incomplete evaluation of the comfort of the vehicle seat by the test console.

SUMMERY OF THE UTILITY MODEL

Based on this, the to-be-solved technical problem of the utility model is to provide a test rack that can test vehicle seat travelling comfort comprehensively.

To the technical problem mentioned above, the utility model provides a following technical scheme:

a test bench for vehicle seat adjustment comprises a bench body, a front seat adjusting part and a rear seat adjusting part, wherein the front seat adjusting part and the rear seat adjusting part are arranged on the bench body; the front-row seat adjusting part is positioned on the front side of the rack body, and the rear-row seat adjusting part is positioned on the rear side of the rack body; the front-row seat adjusting part and the rear-row seat adjusting part respectively comprise an X-direction adjusting unit, a Y-direction adjusting unit and a Z-direction adjusting unit, the Z-direction adjusting unit is located at the lower side of the rack body, and the X-direction adjusting unit and the Y-direction adjusting unit are located at the upper side of the Z-direction adjusting unit.

The utility model discloses an among the partial implementation, front seat regulating part and back row seat regulating part include every single move adjustment mechanism respectively, and it includes: the vehicle seat comprises a fixed bearing plate and a movable bearing plate hinged to the fixed bearing plate, wherein the movable bearing plate is provided with a seat connecting part which is suitable for being connected with a vehicle seat; the adjusting piece penetrates through the fixed bearing plate and abuts against the movable bearing plate, and the adjusting piece moves along the Z direction to drive the movable bearing plate to rotate around the hinged shaft.

The utility model discloses an in some embodiments, the regulating part with fixed loading board threaded connection rotates the regulating part promotes the removal loading board relatively fixed loading board rotates.

The utility model discloses an among the partial implementation, the Y of front seat regulating part and back row seat regulating part includes to adjustment mechanism: the first guide rail is arranged on the first bearing plate and extends along the Y direction; and the first positioning part comprises a first positioning hole arranged on the first guide block and a first positioning pin arranged on the first positioning hole in a penetrating way, and the first positioning pin can be abutted against the first guide rail in a controllable way.

The utility model discloses an among the partial embodiment, first locating pin with first locating hole threaded connection, first locating pin is kept away from one side of first guide rail is equipped with first handle, first handle drive first locating pin is kept away from or is close first guide rail.

The utility model discloses an among the partial implementation, front seat regulating part and back row seat regulating part X respectively include to adjustment mechanism: the second guide rail is arranged on the second bearing plate and extends along the X direction, and the first bearing plate is supported on the second guide block; and the second positioning part comprises a second positioning hole arranged on the second guide block and a second positioning pin arranged on the first positioning hole in a penetrating way, and the second positioning pin can be abutted against the second guide rail in an operable way.

The utility model discloses an among the some embodiments, the second locating pin with second locating hole threaded connection, the second locating pin is kept away from one side of second guide rail is equipped with the second handle, the drive of second handle the second locating pin is kept away from or is close the second guide rail.

The utility model discloses an among the partial implementation, the Z of front seat regulating part and back row seat regulating part is to adjustment mechanism includes: the rack comprises a first bearing piece, a screw rod and a second bearing piece, wherein the first bearing piece is arranged on the rack body, the screw rod is positioned on the upper side of the first bearing piece and extends along the horizontal direction, the second bearing piece is positioned on the upper side of the screw rod, and the second bearing piece is supported on the second bearing piece; the screw rod is rotatably connected to the fixed sleeve and is in threaded connection with the movable sleeve; and both ends are respectively hinged with the first supporting rod on the first bearing part and the fixed sleeve, both ends are respectively hinged with the second supporting rod on the first bearing part and the movable sleeve, both ends are respectively hinged with the third supporting rod on the second bearing part and the fixed sleeve, and both ends are respectively hinged with the fourth supporting rod on the second bearing part and the movable sleeve.

The utility model discloses an in some embodiments, the rack body includes braced frame and installs on braced frame and along the first mounting panel of horizontal direction extension, first carrier pass through fastening components install in on the first mounting panel.

The utility model discloses an among the partial implementation, the Z of front seat regulating part and back row seat regulating part still includes guiding mechanism to adjustment mechanism, include: be fixed in guide sleeve and the guide post of sliding connection on guide sleeve on the first mounting panel, guide post fixed connection in the downside of second loading board extends along the Z.

The utility model discloses an among the partial implementation mode, the tip of screw rod is equipped with the third handle, rotates the third handle and drives remove the cover and follow screw rod endwise slip, and then drive the second and hold carrier to removing along Z.

The technical scheme of the utility model prior art relatively has following technological effect:

the utility model provides an in the test rack for vehicle seat adjusts, can realize the position control of front seat and back row seat itself and the regulation test of front and back row seat relative position relation simultaneously through set up front seat regulating part and back row seat regulating part respectively on the rack body. The test bench can completely simulate the arrangement of the seat in the vehicle, so that the comfort test of the seat is more comprehensive.

Drawings

The objects and advantages of the present invention will be understood from the following detailed description of the preferred embodiments of the invention, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is a schematic structural view of one embodiment of a test bed for vehicle seat adjustment according to the present invention;

FIG. 2 is a schematic structural view of an embodiment of an adjusting portion of a vehicle seat according to the present invention;

FIG. 3 is a front view of one embodiment of a vehicle seat adjustment portion of the present invention;

fig. 4 is a schematic structural view of a pitch adjustment mechanism of an adjustment portion of a vehicle seat according to the present invention;

fig. 5 is another schematic structural view of the pitch adjustment mechanism of the vehicle seat adjustment portion according to the present invention.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

Fig. 1 shows a specific embodiment of the test bench for vehicle seat adjustment of the present invention, which comprises: the bench body 10 and install in vehicle seat adjustment portion on the bench body 10, specifically, vehicle seat adjustment portion includes front seat adjustment portion 70a and back seat adjustment portion 70b, sets up front seat adjustment portion 70a and back seat adjustment portion 70b simultaneously through bench body 10 and can realize the regulation test of the relative position relation of front seat and back seat. The front and rear vehicle seat adjusting portions are capable of adjusting the Y direction (corresponding to the left-right direction of the vehicle), the Z direction (corresponding to the up-down direction of the vehicle), the X direction (corresponding to the front-rear direction of the vehicle), and the pitch angle of the seat, respectively. When the front and rear seats are adjusted in the X direction at the same time, the test adjustment of the relative position relation of the front and rear seats can be realized, and the actual vehicle environment is simulated to test the comfort level of the seats. Specifically, the platform body 10 includes a support frame, and a first mounting plate 103 and a second mounting plate 102 mounted on the support frame and extending in a horizontal direction, wherein the second mounting plate 102 simulates an automobile interior floor, that is, a vehicle seat mounting surface, and the first mounting plate 103 is located at a lower side of the second mounting plate 102 for supporting the vehicle seat adjusting portion 70.

As shown in fig. 2, the front-row vehicle seat adjusting portion 70a and the rear-row seat adjusting portion 70b respectively include a Y-direction adjusting mechanism 71 for adjusting the left-right position of the seat, and a Z-direction adjusting mechanism 72 for adjusting the up-down position of the seat; an X-direction adjustment mechanism 73 for adjusting the seat front-rear position, and a pitch adjustment mechanism 74 for adjusting the pitch angle. The adjustment mechanism can be used to adjust the X, Y, Z directions and pitch angles of the seat, wherein the structure and operation principle of the front row vehicle seat adjusting portion 70a and the rear row seat adjusting portion 70b are the same, and the detailed structure and adjustment manner of the adjustment mechanism are described in detail below.

As shown in fig. 3 to 5, the pitch adjustment mechanism 74 includes: the seat support device comprises a fixed bearing plate 742, a movable bearing plate 743 hinged to the fixed bearing plate 742, and an adjusting part 744 for adjusting the position of the movable bearing plate 743 relative to the fixed bearing plate 742, wherein a seat connecting part 746 is arranged on the movable bearing plate 743, and the seat is mounted on the seat connecting part 746; the adjusting part 744 is located at the non-hinged end of the fixed bearing plate 742 and the movable bearing plate 743, and the adjusting part 744 is disposed through the fixed bearing plate 742 and abuts against the movable bearing plate 743. The control adjusting part 744 moves along the Z direction to drive the moving loading plate 743 to rotate around the hinge shaft, so as to realize the pitch adjustment of the seat on the moving loading plate 743. The front seat adjusting part and the rear seat adjusting part are respectively provided with the pitching adjusting mechanisms, so that the influence on passengers on the rear seat during pitching of the front seat can be further tested, and the comfort test of the seat is more comprehensive.

Specifically, in one embodiment, the adjusting member 744 is an adjusting screw, and the adjusting screw is connected to the fixed bearing plate 742 in a threaded manner and an end of the adjusting screw abuts against a lower plate surface of the movable bearing plate 743. When the seat is adjusted in pitch, the adjusting part 744 can be rotated to move along the Z-direction, and since the adjusting part 744 abuts against the movable carrier 743, the movable carrier 743 moves along with the movable carrier 743 to change the rotation angle of the fixed carrier 742, thereby finally achieving the adjustment in pitch of the seat.

Specifically, the seat is not connected to the seat connecting portion 746 of the moving carrier 743 in a unique manner; in one embodiment, the seat connecting portion 746 is formed as a seat body with a connecting hole or a connecting screw, and the seat bottom is provided with a bolt or a threaded hole matching with the connecting hole or the connecting screw to realize a screw fastening connection. Because the attachment is time consuming and labor intensive to assemble and disassemble, in another embodiment, the seat and the moveable carrier 743 are slidably engaged and then clamped together; specifically, as shown in fig. 5, the seat connecting portion 746 on the moving loading plate 743 is formed as a slide way, the bottom of the seat is provided with a sliding portion matching with the bottom of the seat, the sliding portion is formed as a solid block or a hollow block structure matching with the inner surface of the seat connecting portion 746, the seat is slidably connected to the seat connecting portion 746 of the moving loading plate 743 through the sliding portion, when the sliding portion of the seat slides to a set position along the seat connecting portion 746, the clamping mechanism 76 clamps the sliding portion of the seat and the seat connecting portion 746 along a moving direction perpendicular to the sliding portion, so that the seat is clamped and fixed, and the seat can be conveniently detached and fixed through the clamping and fixing structure.

As shown in fig. 3, the Y-direction adjustment mechanism 71 includes: a first guide block 712 and a first guide rail 713 that are engaged with each other, and a first positioning portion for positioning the first guide block 712, wherein the first guide rail 713 is mounted on a first carrier plate 711 and extends in the Y direction, and a fixed carrier plate 742 of the pitch adjustment mechanism 74 is supported on the first guide block 712; specifically, the fixing carrier plate 742 is shown mounted to the first guide block 712 via a fourth carrier plate 741. The first positioning portion includes a first positioning hole provided on the first guide block 712 and a first positioning pin 714 provided through the first positioning hole, and the first positioning pin 714 is operably abutted on the first guide rail 713. When the seat Y is adjusted, the first guide block 712 is moved to a set position along the first rail 713, and the first guide block 712 is positioned on the first rail 713 by operating the first positioning pin 714. The first positioning structure enables the first guide block 712 to be positioned at any position on the first guide rail 713, thereby achieving more user-friendly position adjustment.

The manner in which the first positioning pin 714 is manipulated for positioning is not exclusive; as shown in fig. 3, the first positioning pin 714 is screwed with the first positioning hole, a first handle 715 is disposed on a side of the first positioning pin 714 far away from the first rail 713, and the first handle 715 drives the first positioning pin 714 far away from or close to the first rail 713.

The X-direction adjustment mechanism 73 of the vehicle seat adjustment portion 70 includes: a second guide block 732 and a second guide rail 733 that are fitted to each other, and a second positioning portion for positioning the position of the second guide block 732; the second guide rail 733 is mounted on the second loading plate 731 and extends in the X direction, and the seat is supported on the second guide block 732 by the first loading plate 711. The second positioning portion includes a second positioning hole provided in the second guide block 732 and a second positioning pin 734 passing through the second positioning hole, and the second positioning pin 734 is operably abutted against the second guide rail 733. When the seat X is adjusted, the second guide block 732 may be moved to a set position along the second guide rail 733, and the second guide block 732 may be positioned on the second guide rail 733 by controlling the second positioning pin 734 of the second positioning portion. The second positioning portion can position the second guide block 732 at an arbitrary position on the second guide rail 733, and realize stepless adjustment of the X-direction position.

The second dowel pin 734 is manipulated to perform positioning in a non-exclusive manner; in an alternative embodiment, as shown in fig. 2, the second positioning pin 734 is in threaded connection with the second positioning hole, a second handle 735 is disposed on a side of the second positioning pin 734 away from the second guide rail 733, and the second positioning pin 734 can be driven to move away from or close to the second guide rail 733 by rotating the second handle 735. The second positioning pin 734 can be conveniently positioned and adjusted by the second handle 735 without other tools, so that the adjusting efficiency of the adjusting mechanism is improved.

As shown in fig. 3, the Z-direction adjustment mechanism 72 of the vehicle seat adjustment portion 70 includes: a first carrier 721 mounted on the first mounting plate 103 and mainly supporting and fixing, a screw 722 arranged on the upper side of the first carrier 721 and extending along the horizontal direction, and a second carrier 723 located on the upper side of the screw 722; the first bearing part 721 is fixed on the first mounting plate 103 of the table body 10, and the seat is supported on the second bearing part 723 through the second bearing plate 731; the two ends of the screw rod 722 are respectively sleeved with a movable sleeve 724 and a fixed sleeve 725, the screw rod 722 is rotatably connected to the fixed sleeve 725, and the screw rod 722 is in threaded connection with the movable sleeve 724; the device further comprises a first support rod 726a, a second support rod 726b, a third support rod 726c and a fourth support rod 726d which are hinged on the first carrier 721, the second carrier 723, the moving sleeve 724 and the fixed sleeve 725; two ends of the first supporting rod 726a are respectively hinged to the first bearing part 721 and the fixing sleeve 725, two ends of the second supporting rod 726b are respectively hinged to the first bearing part 721 and the moving sleeve 724, and two ends of the third supporting rod 726c are respectively hinged to the second bearing part 723 and the fixing sleeve 725; and two ends of the fourth supporting rod 726d are respectively hinged on the second bearing member 723 and the moving sleeve 724. When the seat needs to be adjusted in the Z direction, the screw 722 is rotated to drive the moving sleeve 724 to slide axially along the screw 722, so that the second supporting rod 726b and the fourth supporting rod 726d hinged thereto change in angle relative to the screw 722 in the axial direction, and further drive the second bearing part 723 to translate in a direction away from or close to the first bearing part 721, so that the seat on the second bearing part moves in the Z direction.

The Z-direction adjusting mechanism 72 forms a jack capable of enabling the automobile seat to move in the Z direction through the supporting rod mechanism, and compared with the existing method that a screw jack is adopted as the Z-direction adjusting mechanism, the jack is lighter, simple in adjusting mechanism and easy to install and fix; meanwhile, the screw 722 and the movable sleeve 724 can be adjusted and positioned at the same time, and a positioning mechanism is not required to be arranged independently. In addition, the adjusting mechanism can drive the second bearing member 723 to perform Z-direction translation only by rotating the adjusting screw 722, and the operation and control structure is simple and easy to operate and control.

In order to improve the moving stability of the seat along the Z direction; specifically, the Z-direction adjusting mechanism 72 further includes a guiding mechanism, the guiding mechanism includes a guiding sleeve 727 and a guiding post 728 slidably connected to the guiding sleeve 727, specifically, the guiding sleeve 727 is fixed to the first mounting plate 103 and extends along the Z-direction for a set length, and the guiding post 728 is fixedly connected to the lower side of the second loading plate 731 and extends along the Z-direction. Because the second bearing member 723 and the guiding post 728 are respectively and fixedly connected to the second bearing plate 731, when the second bearing member 723 moves, the guiding post 728 can be driven to move along the axial direction of the guiding sleeve 727, and under the guiding and limiting effects of the guiding sleeve 727 and the guiding post 728, the second bearing plate 731 can be prevented from swinging in the horizontal direction.

More specifically, the second loading plate 731 is a rectangular plate, and the guiding mechanism includes four guiding sleeves 727 and guiding posts 728 respectively disposed at four corners of the second loading plate 731. The guiding mechanism can make the second loading plate 731 move more stably along the Z-direction.

Specifically, the end of the screw 722 is provided with a third handle 729, the third handle 729 is specifically a wheel type handle, and rotating the third handle 729 drives the moving sleeve 724 to slide axially along the screw 722, so as to drive the second bearing 723 to move in the Z direction. Compare the operating handle among the prior art need change the mode of drive direction through drive mechanism, the third handle 729 of this application only need with screw 722 fixed connection can, simple structure, the drive is reliable.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.

Claims

1. A test rig for vehicle seat adjustment, comprising:

the front-row seat adjusting part is arranged on the front side of the rack body, and the rear-row seat adjusting part is arranged on the rear side of the rack body; the front-row seat adjusting part and the rear-row seat adjusting part respectively comprise an X-direction adjusting unit, a Y-direction adjusting unit and a Z-direction adjusting unit, the Z-direction adjusting unit is located at the lower side of the rack body, and the X-direction adjusting unit and the Y-direction adjusting unit are located at the upper side of the Z-direction adjusting unit.

2. A test bench for vehicle seat adjustment according to claim 1, characterized in that: front seat regulating part and back row seat regulating part include every single move adjustment mechanism respectively, and it includes:

the vehicle seat comprises a fixed bearing plate and a movable bearing plate hinged to the fixed bearing plate, wherein the movable bearing plate is provided with a seat connecting part which is suitable for mounting a vehicle seat;

the adjusting piece penetrates through the fixed bearing plate and abuts against the movable bearing plate, and the adjusting piece moves along the Z direction and drives the movable bearing plate to rotate around the hinged shaft.

3. The test rack for vehicle seat adjustment of claim 2, wherein said adjustment member is threadedly coupled to said stationary carrier plate, and rotation of said adjustment member urges said movable carrier plate to rotate relative to said stationary carrier plate.

4. A test bench for vehicle seat adjustment according to any one of claims 1-3, wherein the Y-direction adjustment mechanism of the front and rear seat adjustment portions comprises:

the first guide rail is arranged on the first bearing plate and extends along the Y direction;

and the first positioning part comprises a first positioning hole arranged on the first guide block and a first positioning pin arranged on the first positioning hole in a penetrating way, and the first positioning pin can be abutted against the first guide rail in a controllable way.

5. A test bench for vehicle seat adjustment according to claim 4, wherein the first positioning pin is threadedly connected with the first positioning hole, and a first handle is provided on a side of the first positioning pin remote from the first rail, the first handle driving the first positioning pin away from or towards the first rail.

6. The test rack for vehicle seat adjustment of claim 4, wherein the X-direction adjustment mechanism of the front and rear seat adjustment portions comprises:

the second guide rail is arranged on the second bearing plate and extends along the X direction, and the first bearing plate is supported on the second guide block;

and the second positioning part comprises a second positioning hole arranged on the second guide block and a second positioning pin arranged on the first positioning hole in a penetrating way, and the second positioning pin can be abutted against the second guide rail in an operable way.

7. The test rack for vehicle seat adjustment according to claim 6, wherein the second positioning pin is threadedly coupled to the second positioning hole, and a side of the second positioning pin remote from the second rail is provided with a second handle that drives the second positioning pin away from or toward the second rail.

8. The test rack for vehicle seat adjustment of claim 6, wherein the Z-direction adjustment mechanism of the front and rear seat adjustment portions comprises:

the rack comprises a rack body, a first bearing piece, a screw rod and a second bearing piece, wherein the first bearing piece is arranged on the rack body, the screw rod is positioned on the upper side of the first bearing piece and extends along the horizontal direction, the second bearing piece is positioned on the upper side of the screw rod, and the second bearing piece is supported on the second bearing piece; the screw rod is rotatably connected to the fixed sleeve and is in threaded connection with the movable sleeve;

and both ends are respectively hinged with the first supporting rod on the first bearing part and the fixed sleeve, both ends are respectively hinged with the second supporting rod on the first bearing part and the movable sleeve, both ends are respectively hinged with the third supporting rod on the second bearing part and the fixed sleeve, and both ends are respectively hinged with the fourth supporting rod on the second bearing part and the movable sleeve.

9. A test rig for vehicle seat adjustment according to claim 8, wherein the rig body comprises a support frame and a first mounting plate mounted on the support frame and extending in a horizontal direction, the first carriage being mounted on the first mounting plate by a fastening assembly.

10. The test rack for vehicle seat adjustment of claim 8, wherein the Z-direction adjustment mechanism of the front and rear seat adjustment portions further comprises a guide mechanism comprising:

be fixed in guide sleeve and the guide post of sliding connection on guide sleeve on the first mounting panel, guide post fixed connection in the downside of second loading board extends along the Z.

11. The test rack of claim 10, wherein the end of the threaded rod is provided with a third handle, and rotation of the third handle causes the moving sleeve to slide axially along the threaded rod, which in turn causes the second load bearing member to move in the Z-direction.