Seat and back combined testing machine

Abstract

This utility model relates to a combined chair seat and backrest testing machine in the field of testing machines. It includes a base and two uprights mounted on the base. A movable frame capable of lifting and lowering is connected between the two uprights via a lifting drive assembly. The movable frame is equipped with a chair seat testing assembly for applying pressure to the chair seat and a chair back testing assembly for applying pressure to the chair back. The chair seat testing assembly includes a chair seat pressure drive component, a lifting plate, and a chair seat pressure sensor. The chair seat pressure drive component is connected to the movable frame. A connector is connected to the bottom of the lifting plate via the chair seat pressure sensor. The connector is detachably connected to a chair seat pressure block via an electromagnet suction cup. This utility model's magnetic fixing method reduces the problem of pressure head installation misalignment caused by manual bolt tightening, improves the positioning accuracy of the pressure head installation, simplifies the replacement steps of the conformal pressure block when testing multiple chair models, significantly shortens replacement time, and improves operational convenience and installation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of testing machines, specifically to a combined testing machine for chair seats and backrests. Background Technology

[0002] The seat and backrest combined testing machine is a core piece of equipment for quality control and R&D verification of chair products. It applies dynamic or static loads to the seat and backrest simultaneously through an integrated loading system to replicate the stress scenarios experienced by the chair in actual use. It is mainly used for comprehensive durability, strength, and comfort testing of the seat and backrest structures of various types of chairs (such as office chairs, dining chairs, and lounge chairs). By simulating repeated loading under human usage conditions, this equipment verifies the structural stability and safety of the chair during long-term use.

[0003] The chair seat and backrest combined testing machine mainly consists of a frame, a horizontal drive mechanism, a vertical drive mechanism, a contour indenter, a load sensor, and a control system. Among these, the contour indenter, as a key actuator, needs to be designed according to the ergonomic characteristics of the chair being tested to simulate the contact pressure distribution between the seat and backrest for users of different body types. Traditional testing machines often use contour indenters rigidly connected to the end of the drive mechanism with bolts. During testing, the corresponding specification of the indenter must be manually replaced according to the chair model, and positioning is achieved by tightening the bolts.

[0004] However, existing chair seat and backrest combined testing machines have certain shortcomings when dealing with testing multiple chair models. Due to the significant differences in seat depth, backrest height, and curvature of different chairs, it is necessary to frequently change the appropriate contour indenter to ensure that the loading contact surface matches the chair contour. Traditional indenters are fixed with bolts, and replacement requires manual removal of the bolts. The bolt tightening process requires multiple tightening and calibration, and manual bolt tightening is prone to indenter misalignment. This makes the disassembly and assembly of the indenter cumbersome and time-consuming, thus affecting installation efficiency and positioning. Utility Model Content

[0005] The purpose of this invention is to address the above-mentioned deficiencies by providing a combined chair back test machine, thereby solving the technical problem in the background art of how to improve the quick assembly and disassembly of the indenter used for chair back testing, thus improving the convenience of operation and the efficiency of installation and use.

[0006] The objective of this utility model is achieved through the following means:

[0007] A combined chair seat and backrest testing machine includes a base and two uprights mounted on the base. A testing area is provided between the two uprights. The two uprights are connected by a lifting drive assembly to a movable frame that can be raised and lowered. The movable frame is equipped with a chair seat testing assembly for applying pressure to the chair seat and a chair back testing assembly for applying pressure to the chair back. The chair seat testing assembly includes a chair seat pressure drive, a lifting plate, and a chair seat pressure sensor. The chair seat pressure drive is connected to the movable frame, and the drive end of the chair seat pressure drive is connected to the lifting plate, which can drive the lifting plate to move up and down. The bottom of the lifting plate is connected to a connector via the chair seat pressure sensor. The connector is detachably connected to a chair seat pressure block via an electromagnet chuck.

[0008] When the electromagnet is energized and becomes magnetic, the chair seat block and the electromagnet are quickly connected and fixed by magnetic attraction. When the electromagnet is demagnetized, the chair seat block loses its magnetic attraction and can be quickly disassembled.

[0009] Furthermore, as described above, the lifting drive assembly includes a lifting drive motor, a lead screw assembly, and a lifting seat. The lead screw assembly is installed on the side of the upright frame, the lifting drive motor is connected to the lead screw assembly, and one end of the movable frame is connected to the lead screw assembly through the lifting seat, so that the lifting drive motor can drive the lifting seat to move the movable frame in a lifting motion.

[0010] By setting up a lifting drive assembly consisting of a lifting drive motor, a lead screw assembly, and a lifting seat, and utilizing the transmission characteristics of the lead screw assembly, precise lifting and lowering adjustment of the movable frame can be achieved. This allows the machine to adapt to the testing requirements of seats of different heights, improves its compatibility with multiple seat models, and ensures the positioning accuracy of the seat testing assembly and the backrest testing assembly during the testing process.

[0011] Furthermore, as described above, the movable frame is connected to the seat pressure drive component via a support frame. The seat pressure drive component is composed of a seat pressure cylinder. The telescopic end of the seat pressure cylinder passes through the support frame and is connected to the lifting frame. A guide shaft is connected to the support frame via a bushing, and one end of the guide shaft passes through the support frame and is connected to the lifting frame.

[0012] The movable frame is connected to the chair pressure cylinder via a support frame, and a guide shaft is installed on the support frame via a bushing. The guide shaft is linked with the lifting frame, which can provide stable guidance when the chair pressure cylinder drives the lifting plate to rise and fall, preventing the lifting plate from shifting due to uneven force, ensuring that the contact surface between the chair pressure block and the chair is perpendicular and the pressure is applied evenly, thus improving the stability of the test and the reliability of the data.

[0013] Furthermore, as described above, there are two chair seat pressure cylinders, which are symmetrically mounted on the support frame.

[0014] By setting up two symmetrically installed seat pressure cylinders and driving them synchronously on both sides, the lifting movement of the lifting plate can be more balanced, avoiding the tilting or uneven force caused by driving a single cylinder. This ensures that the seat pressure block applies more uniform pressure to the seat, reduces test deviation, and improves the accuracy of test results.

[0015] Furthermore, as described above, the connector includes a mounting joint and a spring. One end of the mounting joint is connected to the connector, and the other end of the mounting joint is connected to the electromagnet chuck. The spring is sleeved on the mounting joint.

[0016] A spring fitted into the connector and sleeved on the mounting joint provides a cushioning effect when the seat pressure block contacts the seat, preventing damage to the pressure block or seat surface caused by hard impact, and improving the uniformity of pressure transmission and the reliability of the test.

[0017] Furthermore, as described above, the seat pressing block is provided with a magnetic mounting part, and the magnetic mounting part is provided with a magnetic block that magnetically pairs with the electromagnet chuck. The electromagnet chuck has a positioning groove on its side, and the seat pressing block has a positioning protrusion that engages with the positioning groove.

[0018] The seat pressure block is quickly and magnetically fixed by the magnetic block of the magnetic mounting part and the electromagnet chuck, and achieves precise positioning by the positioning groove and the positioning protrusion. This solves the problems of cumbersome disassembly and assembly and easy displacement of the traditional bolt fixing method. It can realize the quick replacement and precise installation of the seat pressure block, significantly improve the seat pressure block adaptation efficiency when testing multiple models of seats, and ensure the accuracy of test positioning.

[0019] Further as described above, the chair back testing assembly comprises a chair back pressure cylinder, a connecting frame, a chair back pressure sensor, and a chair back pressure block. The connecting frame is connected to the support frame, and the chair back pressure cylinder is connected to the connecting frame through an arc-shaped hole, allowing the chair back pressure cylinder to be rotated to adjust its tilt angle. The telescopic end of the chair back pressure cylinder is connected to the chair back pressure sensor, and the chair back pressure sensor is connected to the chair back pressure block through a mounting component.

[0020] The backrest pressure cylinder can be rotated and its tilt angle adjusted through the arc-shaped hole on the connecting frame. The force direction of the pressure cylinder can be adjusted according to the height and curved shape of different backrests to ensure the fit between the backrest pressure block and the backrest contour, improve the adaptability of the testing machine to multiple backrest models, and ensure the accuracy of pressure application and the effectiveness of the test.

[0021] Furthermore, as described above, the mounting component is detachably connected to the chair back pressure block via a magnetic assembly.

[0022] The backrest clamp is detachably connected to the mounting piece via a magnetic component, which solves the problems of time-consuming disassembly and inconvenient operation of traditional fixing methods. It can quickly replace clamps to adapt to different backrest shapes, improve the convenience of operation and the efficiency of backrest clamp replacement when testing multiple models of seats, and meet the needs of rapid adaptation.

[0023] The beneficial effects of this utility model are as follows: By setting an electromagnet chuck in the chair seat testing assembly, the chair seat pressure block and the connecting parts can be quickly disassembled and assembled. When the electromagnet chuck is energized and generates magnetism, the chair seat pressure block and the electromagnet chuck are quickly connected and fixed by magnetic attraction, without the need for manual tightening of bolts or multiple calibrations. When the electromagnet chuck loses its magnetism, the chair seat pressure block loses its magnetic attraction and can be quickly disassembled, avoiding the cumbersome operation of frequent bolt removal, tightening and calibration required by traditional bolt fixing methods. This simplifies the replacement steps of the conformal pressure block when testing multiple chair models, significantly shortens the replacement time, and improves the convenience of operation and installation efficiency. At the same time, the magnetic fixing method reduces the pressure head installation misalignment problem that is easily caused by manual bolt tightening, and improves the positioning accuracy of the pressure head installation. Attached Figure Description

[0024] Figure 1 This is a perspective view of the first direction in this embodiment;

[0025] Figure 2 This is a perspective view of the second direction in this embodiment;

[0026] Figure 3 This is a schematic diagram of the connection structure of the chair seat test component in this embodiment;

[0027] Figure 4 This is a schematic diagram of the structure of the seat test assembly and the backrest test assembly in this embodiment;

[0028] Figure 5 This is a schematic diagram of the connection structure of the chair back test component in this embodiment;

[0029] Figure 6 This is a partial structural diagram of this embodiment;

[0030] Figure 7 This is a schematic diagram of the experimental usage state in this embodiment;

[0031] The reference numerals in the diagram are as follows: 1-base, 2-stand, 3-movable frame, 4-seat pressure drive component, 5-lifting plate, 6-seat pressure sensor, 7-seat pressure block, 8-support frame, 9-shaft sleeve, 10-guide shaft, 11-mounting joint, 12-spring, 13-magnetic mounting part, 14-magnetic block, 15-positioning groove, 16-positioning protrusion, 17-backrest pressure cylinder, 18-connecting frame, 19-backrest pressure sensor, 20-backrest pressure block, 21-mounting component, 22-electromagnetic chuck; 100-lifting drive assembly, 101-lifting drive motor, 102-screw assembly, 103-lifting seat. Detailed Implementation

[0032] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0033] To make the technical problem to be solved, the technical solution and the beneficial effects of this utility model clearer, the following describes the solution in further detail with reference to the accompanying drawings and embodiments.

[0034] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this scheme and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0035] In this embodiment, refer to Figures 1-7 The chair seat and backrest combined testing machine specifically implemented therein includes a base 1 and a stand 2 set on the base 1. There are two stands 2, and a test area is set between the two stands 2. The two stands 2 are connected to a movable frame 3 that can be raised and lowered through a lifting drive assembly 100. The movable frame 3 is equipped with a chair seat test assembly for applying pressure to the chair seat and a chair back test assembly for applying pressure to the chair back. The chair seat test assembly includes a chair seat pressure drive 4, a lifting plate 5 and a chair seat pressure sensor 6. The chair seat pressure drive 4 is connected to the movable frame 3, and the drive end of the chair seat pressure drive 4 is connected to the lifting plate 5 and can drive the lifting plate 5 to move up and down. The bottom of the lifting plate 5 is connected to a connector through the chair seat pressure sensor 6. The connector is detachably connected to a chair seat pressure block 7 through an electromagnet chuck 22.

[0036] When the electromagnet chuck 22 is energized and generates magnetism, the seat pressing block 7 and the electromagnet chuck 22 are quickly connected and fixed by magnetic attraction. When the electromagnet chuck 22 loses its magnetism, the seat pressing block 7 loses its magnetic attraction and can be quickly disassembled.

[0037] The lifting drive assembly 100 includes a lifting drive motor 101, a lead screw assembly 102, and a lifting seat 103. The lead screw assembly 102 is installed on the side of the upright frame 2. The lifting drive motor 101 is connected to the lead screw assembly 102. One end of the movable frame 3 is connected to the lead screw assembly 102 through the lifting seat 103, so that the lifting drive motor 101 can drive the lifting seat 103 to drive the movable frame 3 to move up and down.

[0038] By setting up a lifting drive assembly 100 consisting of a lifting drive motor 101, a lead screw assembly 102, and a lifting seat 103, the transmission characteristics of the lead screw assembly 102 can be used to achieve precise lifting and lowering adjustment of the movable frame 3, thereby adapting to the testing requirements of seats of different heights, improving the adaptability of the testing machine to multiple seat models, and ensuring the positioning accuracy of the seat testing assembly and the backrest testing assembly during the testing process.

[0039] The movable frame 3 is connected to the seat pressure drive component 4 via the support frame 8. The seat pressure drive component 4 is composed of a seat pressure cylinder. The telescopic end of the seat pressure cylinder passes through the support frame 8 and is connected to the lifting frame. A guide shaft 10 is connected to the support frame 8 via a bushing 9. One end of the guide shaft 10 passes through the support frame 8 and is connected to the lifting frame.

[0040] The movable frame 3 is connected to the chair pressure cylinder via the support frame 8, and the support frame 8 is equipped with a guide shaft 10 via a bushing 9. The guide shaft 10 is linked with the lifting frame and can provide stable guidance when the chair pressure cylinder drives the lifting plate 5 to rise and fall, so as to avoid the lifting plate 5 from shifting due to uneven force, and ensure that the contact surface between the chair pressure block 7 and the chair is perpendicular and the pressure is applied evenly, thereby improving the stability of the test and the reliability of the data.

[0041] The chair seat pressure cylinder is provided in two parts, and the two chair seat pressure cylinders are symmetrically installed on the support frame 8.

[0042] By setting up two symmetrically installed seat pressure cylinders and driving them synchronously on both sides, the lifting movement of the lifting plate 5 can be more balanced, avoiding the tilting or uneven force caused by driving a single cylinder. This ensures that the seat pressure block 7 applies more uniform pressure to the seat, reduces test deviation, and improves the accuracy of test results.

[0043] The connector includes a mounting joint 11 and a spring 12. One end of the mounting joint 11 is connected to the connector, and the other end of the mounting joint 11 is connected to the electromagnet chuck 22. The spring 12 is sleeved on the mounting joint 11.

[0044] A spring 12 fitted onto the mounting joint 11 is provided in the connector to provide a buffer when the seat pressure block 7 contacts the seat, avoiding damage to the pressure block or seat surface caused by hard impact, and improving the uniformity of pressure transmission and the reliability of the test.

[0045] The seat pressing block 7 is provided with a magnetic mounting part 13, and the magnetic mounting part is provided with a magnetic block 14 that is magnetically paired with the electromagnet chuck 22. The side of the electromagnet chuck 22 is provided with a positioning groove 15, and the seat pressing block 7 is provided with a positioning protrusion 16 that is locked and paired with the positioning groove 15.

[0046] The seat pressure block 7 is quickly and magnetically fixed to the electromagnet chuck 22 via the magnetic block 14 of the magnetic mounting part 13, and achieves precise positioning through the locking pairing of the positioning groove 15 and the positioning protrusion 16. This solves the problems of cumbersome disassembly and assembly and easy displacement of the traditional bolt fixing method, and enables the seat pressure block 7 to be quickly replaced and accurately installed. This significantly improves the adaptation efficiency of the seat pressure block 7 when testing multiple models of seats and ensures the accuracy of test positioning.

[0047] The chair back testing assembly comprises a chair back pressure cylinder 17, a connecting frame 18, a chair back pressure sensor 19, and a chair back pressure block 20. The connecting frame 18 is connected to the support frame 8, and the connecting frame 18 is connected to the chair back pressure cylinder 17 through an arc-shaped hole, so that the chair back pressure cylinder 17 can be rotated to adjust the tilt angle. The telescopic end of the chair back pressure cylinder 17 is connected to the chair back pressure sensor 19, and the chair back pressure sensor 19 is connected to the chair back pressure block 20 through a mounting part 21.

[0048] The backrest pressure cylinder 17 can be rotated and its tilt angle adjusted through the arc-shaped hole on the connecting frame 18. The force direction of the pressure cylinder can be adjusted according to the height and curved shape of different backrests to ensure the fit between the backrest pressure block 20 and the backrest contour, improve the adaptability of the testing machine to multiple backrest models, and ensure the accuracy of pressure application and the effectiveness of the test.

[0049] The mounting component 21 is detachably connected to the chair back pressure block 20 via a magnetic assembly.

[0050] The backrest pressure block 20 is detachably connected to the mounting piece 21 via a magnetic component, which solves the problems of time-consuming disassembly and assembly and inconvenient operation of traditional fixing methods. It can quickly replace pressure blocks that are adapted to different backrest shapes, improve the ease of operation and the efficiency of replacing the backrest pressure block 20 when testing multiple models of seats, and meet the needs of rapid adaptation.

[0051] The specific usage process in this embodiment is as follows:

[0052] The office chair is placed on the base 1, and the support legs of the office chair are locked by the clamping component to prevent the office chair from shifting. At this time, the corresponding seat pressure block 7 is inserted and sleeved along the positioning groove 15 through the positioning protrusion 16 to prevent the seat pressure block 7 from rotating and shifting, further ensuring the stability and accuracy of the installation. The electromagnet chuck 22 is energized to generate a strong magnet to cooperate with the magnetic installation part for magnetic fixation. The installation and fixation of the seat pressure block 7 can be completed quickly, and the backrest pressure block 20 is magnetically fixed by the strong magnet of the energized magnetic component. This simplifies the replacement steps of the conformal seat and backrest pressure block 20 when testing multiple models of chairs, significantly shortens the replacement time, and improves the convenience of operation and installation efficiency. At the same time, the magnetic fixation method reduces the problem of pressure head installation misalignment caused by manual bolt tightening and improves the positioning accuracy of pressure head installation.

[0053] Conversely, when the electromagnet chuck 22 and the magnetic gripping force are released, the seat pressure block 7 and the backrest pressure block 20 lose their magnetic attraction and can be quickly disassembled. This avoids the tedious operation of frequently disassembling and tightening bolts for calibration required by the traditional bolt fixing method. It allows the operator to simply lift the corresponding pressure block and pair it with the positioning structure to complete the fitting and installation of the pressure block.

[0054] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the present utility model without departing from the scope of the present utility model shall fall within the scope of the present utility model.

Claims

1. A combined chair seat and backrest testing machine, comprising a base and two uprights mounted on the base, wherein a testing area is provided between the two uprights, characterized in that: The two uprights are connected by a lifting drive assembly to a movable frame that can be raised and lowered. The movable frame is equipped with a seat test assembly for applying pressure to the seat and a backrest test assembly for applying pressure to the backrest. The seat test assembly includes a seat pressure drive, a lifting plate, and a seat pressure sensor. The seat pressure drive is connected to the movable frame, and the drive end of the seat pressure drive is connected to the lifting plate, which can drive the lifting plate to move up and down. The bottom of the lifting plate is connected to a connector through the seat pressure sensor. The connector is detachably connected to a seat pressure block through an electromagnet chuck. When the electromagnet is energized and becomes magnetic, the chair seat block and the electromagnet are quickly connected and fixed by magnetic attraction. When the electromagnet is demagnetized, the chair seat block loses its magnetic attraction and can be quickly disassembled.

2. The chair seat-back combined testing machine according to claim 1, characterized in that: The lifting drive assembly includes a lifting drive motor, a lead screw assembly, and a lifting seat. The lead screw assembly is installed on the side of the upright frame, and the lifting drive motor is connected to the lead screw assembly. One end of the movable frame is connected to the lead screw assembly through the lifting seat, so that the lifting drive motor can drive the lifting seat to move the movable frame up and down.

3. The chair seat-back combined testing machine according to claim 1, characterized in that: The movable frame is connected to the seat pressure drive component via a support frame. The seat pressure drive component consists of a seat pressure cylinder. The telescopic end of the seat pressure cylinder passes through the support frame and is connected to the lifting frame. A guide shaft is connected to the support frame via a bushing. One end of the guide shaft passes through the support frame and is connected to the lifting frame.

4. The chair seat-back combined testing machine according to claim 3, characterized in that: The chair seat pressure cylinder is provided in two parts, and the two chair seat pressure cylinders are symmetrically installed on the support frame.

5. The chair seat-back combined testing machine according to claim 1, characterized in that: The connector includes a mounting joint and a spring. One end of the mounting joint is connected to the connector, and the other end of the mounting joint is connected to the electromagnet chuck. The spring is sleeved on the mounting joint.

6. The chair seat-back combined testing machine according to any one of claims 1-5, characterized in that: The chair seat pressing block is provided with a magnetic mounting part, and the magnetic mounting part is provided with a magnetic block that is magnetically paired with the electromagnet chuck. The electromagnet chuck has a positioning groove on its side, and the chair seat pressing block has a positioning protrusion that is engaged with the positioning groove.

7. The chair seat-back combined testing machine according to claim 3, characterized in that: The chair back testing assembly comprises a chair back pressure cylinder, a connecting frame, a chair back pressure sensor, and a chair back pressure block. The connecting frame is connected to the support frame, and the chair back pressure cylinder is connected to the connecting frame through an arc-shaped hole, allowing the chair back pressure cylinder to be rotated to adjust the tilt angle. The telescopic end of the chair back pressure cylinder is connected to the chair back pressure sensor, and the chair back pressure sensor is connected to the chair back pressure block through a mounting component.

8. The chair seat-back combined testing machine according to claim 7, characterized in that: The mounting component is detachably connected to the chair back pressure block via a magnetic assembly.

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