Device and method for testing mechanical property of chair leg rest component

Abstract

A testing device for mechanical properties of chair leg rest components comprises a rack, a lifting mechanism, a loading mechanism and a seat fixing mechanism, the seat fixing mechanism is fixed on the rack, a seat is fixed through the seat fixing mechanism, the lifting mechanism is installed on the rack in a lifting mode, the loading mechanism is installed on the lifting mechanism in a sliding mode, and the loading mechanism is installed on the loading mechanism in a sliding mode. And the loading mechanism is driven by the lifting mechanism to quickly lift, so that the testing efficiency of the testing device is improved. Various loading heads are arranged to test various different mechanical properties of the chair leg rest component, so that the diversity and comprehensiveness of test data are improved, and the accuracy of the test data of the test device is further improved.

Description

Technical Field

[0001] The invention belongs to the technical field of testing devices, and in particular relates to a testing device and a testing method for the mechanical properties of a chair leg rest component. Background Art

[0002] With the continuous innovation and iteration of chair products, the concept of lunch break chairs has been innovated based on the design of ordinary office chairs, that is, a leg rest is designed under the seat cushion of the office chair. Most of the leg rests on the market are pull-out (retractable) structures, the purpose of which is to effectively support the legs of consumers during their lunch break in the chair, so that they can reach a relaxed state. In the process of designing and developing such products, it is often necessary to test and improve them. At present, there are many devices for testing seats on the market, but such testing devices cannot test the foot rest, resulting in more randomness in the foot rest during the test process, affecting the accuracy of the test results. Summary of the invention

[0003] In view of the above deficiencies, the technical problem to be solved by the present invention is to provide a testing device and a testing method for the mechanical properties of chair leg rest components, which are used to perform unified testing on chair leg rest components to improve the accuracy and convenience of the test.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: A testing device for the mechanical properties of a chair leg rest comprises a frame, a lifting mechanism, a loading mechanism and a seat fixing mechanism, wherein the seat fixing mechanism is fixed on the frame, the lifting mechanism is liftably mounted on the frame, the loading mechanism is slidably mounted on the lifting mechanism, the loading mechanism comprises a loading frame, a loading drive, a test sensor assembly and a loading head, the lifting mechanism is connected to the loading frame, the loading drive is mounted on the loading frame, the test sensor assembly is mounted on the loading drive, and the loading head is detachably mounted on the test sensor assembly; the loading head comprises a fixture and a loading assembly mounted at the bottom of the fixture, and the loading assembly is detachably mounted on the test sensor assembly via the fixture.

[0005] As a preferred solution of the present invention, the fixture is provided with a positioning groove, a slot and a locking piece, the positioning groove is arranged at the top of the slot, the locking piece is arranged in the slot, and the fixture is detachably mounted on the test sensor assembly through the locking piece.

[0006] As a preferred solution of the present invention, the loading assembly includes a connecting member and an abutting member, and the abutting member is swingably connected to the clamp via the connecting member.

[0007] As a preferred solution of the present invention, the loading assembly further comprises a connecting plate, and abutment members are respectively provided at both ends of the connecting plate and installed through the connecting members.

[0008] As a preferred solution of the present invention, a sliding bracket is installed on the loading frame, a locking piece is installed on the sliding bracket, and the sliding bracket is fixedly connected to the loading frame through the locking piece.

[0009] As a preferred solution of the present invention, the loading mechanism also includes a loading guide, which includes a guide rod, a fixed block and a guide block. The guide rod is fixed to the bottom of the test sensor assembly through the fixed block, the guide block is fixed to the loading drive member, and the guide rod is slidably connected to the guide block.

[0010] As a preferred solution of the present invention, the test sensor assembly includes a sensor bracket, a test sensor and a mounting shaft, the test sensor is mounted on the sensor bracket, the mounting shaft is fixed to the bottom of the sensor bracket, the loading head is detachably mounted on the mounting shaft, and the fixed block is connected to the mounting shaft.

[0011] As a preferred solution of the present invention, the lifting mechanism includes a lifting screw assembly, a lifting motor and a lifting frame, the lifting motor is connected to the lifting screw assembly, the lifting frame is connected to the lifting screw assembly, and the loading frame is installed on the lifting frame.

[0012] As a preferred solution of the present invention, the seat fixing mechanism includes a pressing assembly and a chair leg fixing member respectively installed on the frame, the pressing assembly is arranged toward the chair leg fixing member, and the seat is abutted against the chair leg fixing member through the pressing assembly.

[0013] As a preferred solution of the present invention, the pressing assembly includes a screw, a pressing plate and a handwheel, the screw is fixed on the frame, the pressing plate is slidably installed on the screw, the handwheel is installed on the screw through a thread, and the handwheel is abutted against the pressing plate, and a groove adapted to the seat is provided on the pressing plate.

[0014] As a preferred solution of the present invention, the chair leg fixing piece is provided with a universal wheel sleeve adapted to the seat universal wheel, and the chair leg fixing piece is provided with a waist-shaped adjustment groove, which is connected to the frame by screws.

[0015] As a preferred solution of the present invention, a plurality of mounting screw holes are evenly distributed on the bottom of the frame, and the pressing assembly and the chair leg fixing parts are fixed to the frame through the mounting screw holes.

[0016] The testing method of the above-mentioned testing device for the mechanical properties of the chair leg rest component comprises the following steps: Step 1: Fix the seat on the test device and adjust the leg rest to extend out of the seat; Step 2, setting a plurality of test points on the leg rest component according to the position of the user's legs placed on the leg rest component; Step 3: Perform static and cyclic dynamic tests on the seat through a test device; in the static test, perform functional and destructive tests on the leg rest at each test point; in the cyclic dynamic test, repeatedly apply load to each test point through the test device; Step 4: Inspect the leg rest after testing.

[0017] The beneficial effect of the present invention is that by providing a variety of loading heads, a variety of different mechanical property tests can be performed on the leg rest components of chairs, thereby improving the diversity and comprehensiveness of the test data and further improving the accuracy of the test data of the test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of this test device.

[0019] Figure 2 yes Figure 1 Schematic diagram of the structure after rotating at a certain angle.

[0020] Figure 3 This is a partial enlarged view of point A.

[0021] Figure 4 It is a schematic diagram of the loading head structure of a one-word loading component.

[0022] Figure 5 It is a schematic diagram of the loading head structure of the middle loading component.

[0023] Figure 6 yes Figure 5 Schematic diagram of the structure after rotating at a certain angle.

[0024] Figure 7 It is a schematic diagram of the loading head structure of the loading components on both sides.

[0025] Reference numerals: loading head 1, clamp 1-1, positioning groove 1-1-1, slot 1-1-2, connecting hole 1-1-3, connecting groove 1-1-4, loading assembly 1-2, connecting member 1-2-1, abutting member 1-2-2, mounting seat 1-2-3, swing seat 1-2-4, connecting plate 1-2-5, locking member 1-3, locking screw 1-3-1, wrench 1-3-2; Frame 2, bottom plate 2-1, gantry 2-2, mounting screw holes 2-3; Fixing mechanism 3, pressing assembly 3-1, chair leg fixing part 3-2, screw rod 3-3, pressing plate 3-4, hand wheel 3-5, universal wheel sleeve 3-6, groove 3-7, waist-shaped adjustment groove 3-8; Lifting mechanism 4, lifting screw assembly 4-1, lifting motor 4-2, lifting frame 4-3; Loading mechanism 6, loading frame 6-1, loading drive 6-2, test sensor assembly 6-3, sensor bracket 6-4, test sensor 6-5, mounting shaft 6-6, fixing block 6-7, guide block 6-8, guide rod 6-9, sliding bracket 6-10, locking member 6-11. DETAILED DESCRIPTION

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] A testing device for the mechanical properties of a chair leg rest comprises a frame 2, a lifting mechanism 4, a loading mechanism 6 and a seat fixing mechanism 3. The seat fixing mechanism 3 is fixed on the frame 2, and the seat is fixed by the seat fixing mechanism 3. The lifting mechanism 4 is installed on the frame 2 in a liftable manner. The loading mechanism 6 is slidably installed on the lifting mechanism 4. The loading mechanism 6 is driven by the lifting mechanism 4 to be quickly lifted and lowered, thereby improving the testing efficiency of the testing device.

[0028] The frame 2 includes a base plate 2-1 and a gantry 2-2 fixed on the base plate 2-1, a lifting mechanism 4 is installed on both sides of the gantry 2-2, a loading mechanism 6 is connected to the lifting mechanism 4, thereby driving the loading mechanism 6 to rise and fall on the gantry 2-2, a plurality of mounting screw holes 2-3 are evenly distributed on the base plate 2-1, and a seat fixing mechanism 3 is fixed to the frame 2 through the mounting screw holes 2-3.

[0029] The seat fixing mechanism 3 includes a pressing component 3-1 and a chair leg fixing member 3-2 respectively installed on the frame 2. The pressing component 3-1 is set toward the chair leg fixing member 3-2. By adjusting the pressing component 3-1, the seat is abutted against the chair leg fixing member 3-2, thereby fixing the seat on the frame 2.

[0030] The pressing assembly 3-1 includes a screw rod 3-3, a pressing plate 3-4 and a handwheel 3-5. The screw rod 3-3 is fixed on the frame 2. The pressing plate 3-4 is slidably installed on the screw rod 3-3. The handwheel 3-5 is installed on the screw rod 3-3 through a thread, and the handwheel 3-5 abuts against the pressing plate 3-4. The pressing plate 3-4 is provided with a groove 3-7 adapted to the seat. When fixing the seat, first fix the screw rod 3-3 on the side close to the seat foot, and then install the pressing plate 3-4 on the screw rod 3-3 so that the pressing plate 3-4 abuts against the seat foot, and then install the handwheel 3-5 on the screw rod 3-3, and turn the handwheel 3-5 to press the pressing plate 3-4 on the surface of the seat foot.

[0031] The chair leg fixing part 3-2 is provided with a universal wheel sleeve 3-6 adapted to the universal wheel of the seat, and a waist-shaped adjustment groove 3-8 is provided on the chair leg fixing part 3-2. The waist-shaped adjustment groove 3-8 is connected to the mounting screw hole 2-3 by screws. The position of the chair leg fixing part 3-2 can be adjusted according to needs through the waist-shaped adjustment groove 3-8. When fixing the seat, first fix the chair leg fixing part 3-2 on the base plate 2-1, and then place the universal wheel of the seat in the universal wheel sleeve 3-6 to prevent the seat from slipping.

[0032] The lifting mechanism 4 includes a lifting screw assembly 4-1, a lifting motor 4-2 and a lifting frame 4-3. The lifting motor 4-2 is fixed on the gantry 2-2 and connected to the lifting screw assembly 4-1. The lifting frame 4-3 is connected to the lifting screw assembly 4-1, and the loading frame 6-1 is installed on the lifting frame 4-3. Preferably, the lifting screw assembly 4-1 includes a screw and a slider installed on the screw by a thread, the lifting motor 4-2 is connected to the screw, and the lifting frame 4-3 is sleeved on the outside of the slider.

[0033] The loading mechanism 6 includes a loading frame 6-1, a loading drive 6-2, a test sensor assembly 6-3 and a loading head 1. The loading frame 6-1 is connected to the lifting frame 4-3. The loading drive 6-2 is installed on the loading frame 6-1. The test sensor assembly 6-3 is installed on the loading drive 6-2. The loading head 1 is detachably installed on the test sensor assembly 6-3, and the loading head 1 abuts against the leg rest component. The test sensor assembly 6-3 is used to detect the force of the loading head 1 on the leg rest component, so as to control the loading drive 6-2 according to the test requirements to ensure that the force of the loading head 1 on the leg rest component meets the test requirements.

[0034] The loading frame 6-1 is provided with a sliding bracket 6-10, the loading drive 6-2 is fixed at the bottom of the sliding bracket 6-10, the sliding bracket 6-10 is provided with a locking member 6-11, and the sliding bracket 6-10 is fixedly connected to the loading frame 6-1 through the locking member 6-11. Preferably, the locking member 6-11 is a screw structure with a handle, which is convenient for locking the sliding bracket 6-10 on the loading frame 6-1 to prevent the loading drive 6-2 from moving during the test.

[0035] The loading mechanism 6 also includes a loading guide, which includes a guide rod 6-9, a fixed block 6-7 and a guide block 6-8. The guide rod 6-9 is fixed to the bottom of the test sensor assembly 6-3 through the fixed block 6-7, and the guide block 6-8 is fixed to the loading drive member 6-2. The guide rod 6-9 is slidably connected to the guide block 6-8. Through the setting of the loading guide, it is convenient to guide the moving direction of the loading head 1, thereby preventing the loading head 1 from rotating during the test process, thereby ensuring the accuracy of the test data.

[0036] The test sensor assembly 6-3 includes a sensor bracket 6-4, a test sensor 6-5 and a mounting shaft 6-6. The test sensor 6-5 is mounted on the sensor bracket 6-4. The force exerted by the loading head 1 on the leg rest is detected by detecting the pressure of the sensor bracket 6-4. The mounting shaft 6-6 is fixed to the bottom of the sensor bracket 6-4. The loading head 1 is detachably mounted on the mounting shaft 6-6. The fixing block 6-7 is connected to the mounting shaft 6-6.

[0037] This embodiment provides three types of loading heads 1. During the testing phase, the loading heads 1 can be replaced according to the type of data to be tested, so as to meet the user's requirements for different mechanical performance data of chair leg rests.

[0038] The loading head 1 includes a clamp 1-1 and a loading component 1-2. The loading component 1-2 is installed at the bottom of the clamp 1-1. The loading component 1-2 is installed on a chair leg rest mechanical properties testing device through the clamp 1-1. The chair leg rest mechanical properties testing device applies a force to the loading head so that the loading component 1-2 abuts against the chair leg rest, thereby testing the mechanical properties of the chair leg rest.

[0039] The fixtures 1 - 1 of the three loading heads 1 have the same structure, but the loading components 1 - 2 have different structures, and the loading components 1 - 2 can be fixed to the bottom of the fixture 1 - 1 as required.

[0040] The clamp 1-1 is provided with a positioning groove 1-1-1 and a locking piece 1-3. The clamp 1-1 is positioned and installed on the chair leg rest mechanical properties testing device through the positioning groove 1-1-1 to prevent the clamp 1-1 from rotating relative to the testing device during loading. The locking piece 1-3 is connected to the chair leg rest mechanical properties testing device. The clamp 1-1 is fixed to the chair leg rest mechanical properties testing device through the locking piece 1-3, which improves the installation convenience of the clamp 1-1 and facilitates the replacement of the loading head, thereby facilitating the testing device to perform different mechanical properties tests on the chair leg rest.

[0041] The positioning groove 1-1-1 is arranged at the top of the fixture 1-1, which is convenient for the positioning groove 1-1-1 to abut against the end face of the testing device, thereby realizing the positioning installation of the positioning groove 1-1-1 and the testing device. The positioning groove 1-1-1 is arranged along the radial direction of the fixture 1-1, which is convenient for processing the positioning groove 1-1-1.

[0042] A slot 1-1-2 is provided in the middle of the fixture 1-1, and a positioning slot 1-1-1 is arranged at the top of the slot 1-1-2. The installation shaft 6-6 of the test device is inserted into the slot 1-1-2, and the positioning slot 1-1-1 is used to prevent the fixture 1-1 from rotating relative to the installation shaft 6-6. One end of the locking member 1-3 extends into the slot 1-1-2. By adjusting the locking member 1-3, one side of the locking member 1-3 is abutted against the installation shaft 6-6, thereby locking the fixture 1-1 and the installation shaft 6-6.

[0043] A connecting hole 1-1-3 is provided at the bottom of the slot 1-1-2. The connecting hole 1-1-3 is used to install a bolt. The loading assembly 1-2 is connected to the fixture 1-1 through the connecting hole 1-1-3.

[0044] The locking member 1-3 includes a locking screw 1-3-1 and a wrench 1-3-2. The locking screw 1-3-1 is installed on the clamp 1-1 through a thread, and the locking screw 1-3-1 is set toward the slot 1-1-2, and the wrench 1-3-2 is fixed to the outer end of the locking screw 1-3-1, and the locking screw 1-3-1 is driven to rotate by the wrench 1-3-2.

[0045] The loading assembly 1-2 includes a straight loading assembly, a two-side loading assembly, and a middle loading assembly. The straight loading assembly is used for destructive testing of the leg rest; the two-side loading assembly is used to simulate that the user's legs are placed on the leg rest in parallel, that is, both sides of the leg rest are stressed at the same time. If one of the abutting members 1-2-2 in the two-side loading assembly is removed, it is used to simulate that the user places one leg on the leg rest, that is, the leg rest is stressed on one side; the middle loading assembly is used to simulate that the user places two legs crossed on the leg rest, that is, the middle part of the leg rest is stressed. The switching of the test function of the test device is achieved by replacing the above three loading assemblies 1-2.

[0046] In the straight loading assembly, the loading assembly 1-2 is a plate, the length of the plate is 30-40 cm, the width is 8-10 cm, and the bottom of the plate is in an arc shape.

[0047] In the middle loading assembly, the loading assembly 1-2 includes a connecting member 1-2-1 and an abutting member 1-2-2, and the abutting member 1-2-2 is swingably connected to the clamp 1-1 through the connecting member 1-2-1.

[0048] Specifically, the connecting member 1-2-1 includes a mounting seat 1-2-3 and a swinging seat 1-2-4. The mounting seat 1-2-3 is fixedly mounted on the bottom of the clamp 1-1, and the swinging seat 1-2-4 is fixedly mounted on the abutment 1-2-2. The swinging seat 1-2-4 is swingably mounted on the mounting seat 1-2-3 via a rotating shaft, so that the abutment 1-2-2 is swingably mounted on the clamp 1-1 via the connecting member 1-2-1.

[0049] In order to facilitate the installation of the mounting seat 1-2-3, a connecting groove 1-1-4 is provided at the bottom of the clamp 1-1, the top of the mounting seat 1-2-3 is installed in the connecting groove 1-1-4, and the mounting seat 1-2-3 is installed at the bottom of the clamp 1-1 through the bolts in the connecting hole 1-1-3. Preferably, the connecting groove 1-1-4 is cross-shaped, and the top surface of the mounting seat 1-2-3 is straight-shaped. By changing the connection relationship between the mounting seat 1-2-3 and the connecting groove 1-1-4, the abutment 1-2-2 is installed on the clamp 1-1 parallel to or vertically relative to the positioning groove 1-1-1.

[0050] The abutting member 1-2-2 is a plate member, the width of the abutting member 1-2-2 is 8-12 cm, the length is 15-19 cm, and the bottom surface of the abutting member 1-2-2 is in an arc shape.

[0051] In the two-side loading assembly, the loading assembly 1-2 includes a connecting plate 1-2-5, two mounting seats 1-2-3 and two swing seats 1-2-4. The two mounting seats 1-2-3 are respectively mounted at both ends of the connecting plate 1-2-5. The two swing seats 1-2-4 are respectively connected to the connecting plate 1-2-5 through the two mounting seats 1-2-3. The clamp 1-1 is installed in the middle of the connecting plate 1-2-5 by bolts. The length of the connecting plate 1-2-5 is 31-36 cm and the width is 4-6 cm.

[0052] A method for testing a mechanical property test device for a chair leg rest component comprises the following steps: Step one, fix the seat on the test device, and adjust the leg rest to extend out of the seat; specifically, place the universal wheel of the seat on the chair leg fixing part 3-2, and abut the pressing component 3-1 against the seat surface. After the seat is fixed, adjust the leg rest to the most vulnerable position, that is, adjust the leg rest to the outermost side.

[0053] Step 2: setting a plurality of test points on the leg rest according to the positions of the user's legs on the leg rest, wherein the test points include a middle test point and two side test points.

[0054] Step 3: Perform static and cyclic dynamic tests on the seat through a test device; in the static test, perform functional and destructive tests on the leg rest at each test point; in the cyclic dynamic test, repeatedly apply pressure to each test point through the test device; Step 4: Inspect the leg rest after testing.

[0055] The static test in step 3 includes the following three test processes: (1.1) Leg rest strength test - static load - middle test point Set the center of the length and width of the leg rest load-bearing structure as the middle test point, and apply load to the middle test point through the straight loading assembly and the middle loading assembly. During the test, the chair tends to tilt forward, and the loading plates should be placed on the seat surface close to the backrest in sequence until the chair does not tip over.

[0056] Functional load: 42.5kg, tested 10 times.

[0057] Destructive load: 51kg, tested 10 times.

[0058] (1.2) Leg rest strength test - static load - test points on both sides simultaneously Set the positions 110mm to the left and right of the middle test point along the length direction as the test points on both sides, and mark points "A" and "B". Align the abutment parts 1-2-2 of the loading components on both sides with the marked points "A" and "B" respectively, and apply the load. During the test, the chair tends to tilt forward, and the loading plates should be placed on the seat close to the backrest in sequence until the chair does not tip over.

[0059] Functional load: 42.5kg, tested 10 times.

[0060] Destructive load: 51kg, tested 10 times.

[0061] (1.3) Legrest strength test - static load - single-side test at both test points Set the positions 110mm to the left and right of the middle test point along the length direction as the test points on both sides, and mark points "A" and "B". Remove the abutment members 1-2-2 on one side of the loading assembly on both sides, align the abutment members 1-2-2 of the loading assembly with the marked points "A" and "B" twice, and apply the load. During the test, the chair tends to tilt forward, and the loading plates should be placed on the seat close to the backrest in sequence until the chair does not tip over.

[0062] Functional load: 42.5kg, tested 10 times.

[0063] Destructive load: 51kg, tested 10 times.

[0064] The cyclic dynamic test in step 3 includes the following three test processes: (2.1) Leg rest durability test - cyclic load - middle test point The load is applied to the middle test point several times, each time with a load of 34kg, for 2000 cycles. During the test, the chair tends to tilt forward, and the loading plate should be placed on the seat close to the backrest in turn until the chair does not tip over.

[0065] (2.2) Leg rest durability test - cyclic load - testing at both sides simultaneously The load is applied to the test points on both sides multiple times by the loading components on both sides, each time the load is 34kg, and the cycle is 8000 times. During the test, the chair tends to tilt forward, and the loading plates should be placed on the seat close to the backrest in turn until the chair does not tip over.

[0066] (2.3) Leg rest durability test - Cyclic load - Single-side test at both test points Remove the abutment 1-2-2 on one side of the loading assembly on both sides, align the abutment 1-2-2 of the loading assembly with the marked points "A" and "B" twice, apply the load multiple times, each time the load is 34kg, and the cycle is 2000 times. During the test, the chair has a tendency to tilt forward, and the loading plate should be placed on the seat close to the backrest in turn until the chair does not tip over.

[0067] The inspection contents of step 4 include at least the following items: a) Whether any parts or joints are broken; b) Whether any joint that should be firm becomes loose when pressed manually; c) Whether there is any deformation or wear that affects the function; d) Whether it can be reset; e) Whether there is any stagnation or inflexibility during the test; f) After functional load testing: there should be no loss of usability; g) After destructive load test: no sudden or significant deformation should occur, the component should be able to withstand functional loads, and loss of function is acceptable.

[0068] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention; therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0069] Although this article uses more terms corresponding to the figure marks in the figures, it does not exclude the possibility of using other terms; these terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional limitations is contrary to the spirit of the present invention.

Claims

1. A testing device for the mechanical properties of a chair leg rest, characterized in that: The invention comprises a frame (2), a lifting mechanism (4), a loading mechanism (6) and a seat fixing mechanism (3), wherein the seat fixing mechanism is fixed on the frame, the lifting mechanism is installed on the frame in a liftable manner, and the loading mechanism is slidably installed on the lifting mechanism. The loading mechanism (6) comprises a loading frame (6-1), a loading drive member (6-2), a test sensor assembly (6-3) and a loading head (1), the lifting mechanism (4) is connected to the loading frame (6-1), the loading drive member (6-2) is installed on the loading frame (6-1), the test sensor assembly (6-3) is installed on the loading drive member (6-2), and the loading head (1) is detachably installed on the test sensor assembly (6-3); the loading head (1) comprises a fixture (1-1) and a loading assembly (1-2) installed at the bottom of the fixture (1-1), and the loading assembly (1-2) is detachably installed on the test sensor assembly (6-3) through the fixture (1-1).

2. A test device for the mechanical properties of a chair leg rest according to claim 1, characterized in that: The fixture (1-1) is provided with a positioning groove (1-1-1), a slot (1-1-2) and a locking piece (1-3); the positioning groove (1-1-1) is arranged at the top of the slot (1-1-2), and the locking piece (1-3) is arranged in the slot (1-1-2); the fixture (1-1) is detachably mounted on the test sensor assembly (6-3) via the locking piece (1-3).

3. A test device for the mechanical properties of a chair leg rest according to claim 1, characterized in that: The loading assembly (1-2) comprises a connecting member (1-2-1) and an abutting member (1-2-2); the abutting member (1-2-2) is swingably connected to the clamp (1-1) via the connecting member (1-2-1).

4. A device for testing the mechanical properties of a chair leg rest according to claim 3, characterized in that: The loading assembly (1-2) further comprises a connecting plate (1-2-5), and abutment members (1-2-2) are respectively provided at both ends of the connecting plate (1-2-5) and are installed via connecting members (1-2-1).

5. The device for testing the mechanical properties of a chair leg rest according to claim 1, characterized in that: A sliding bracket (6-10) is mounted on the loading frame (6-1), a locking member (6-5) is mounted on the sliding bracket (6-10), and the sliding bracket (6-10) is fixedly connected to the loading frame (6-1) via the locking member (6-5).

6. A device for testing the mechanical properties of a chair leg rest according to claim 1, characterized in that: The loading mechanism (6) further comprises a loading guide member, which comprises a guide rod (6-9), a fixed block (6-7) and a guide block (6-8); the guide rod (6-9) is fixed to the bottom of the test sensor assembly (6-3) via the fixed block (6-7); the guide block (6-8) is fixed to the loading drive member (6-2); and the guide rod (6-9) is slidably connected to the guide block (6-8).

7. A device for testing the mechanical properties of a chair leg rest according to claim 6, characterized in that: The test sensor assembly (6-3) comprises a sensor bracket (6-4), a test sensor (6-5) and a mounting shaft (6-6); the test sensor (6-5) is mounted on the sensor bracket (6-4); the mounting shaft (6-6) is fixed to the bottom of the sensor bracket (6-4); the loading head (1) is detachably mounted on the mounting shaft (6-6); and the fixing block (6-7) is connected to the mounting shaft (6-6).

8. The device for testing the mechanical properties of a chair leg rest according to claim 1, characterized in that: The lifting mechanism (4) comprises a lifting screw assembly (4-1), a lifting motor (4-2) and a lifting frame (4-3); the lifting motor (4-2) is connected to the lifting screw assembly (4-1); the lifting frame (4-3) is connected to the lifting screw assembly (4-1); and the loading frame (6-1) is mounted on the lifting frame (4-3).

9. The device for testing the mechanical properties of a chair leg rest according to claim 1, characterized in that: The seat fixing mechanism (3) comprises a pressing component (3-1) and a chair leg fixing member (3-2) respectively mounted on the frame (2); the pressing component (3-1) is arranged towards the chair leg fixing member (3-2); and the seat is abutted against the chair leg fixing member (3-2) by the pressing component (3-1).

10. A device for testing the mechanical properties of a chair leg rest according to claim 9, characterized in that: The pressing assembly (3-1) comprises a screw rod (3-3), a pressing plate (3-4) and a hand wheel (3-5); the screw rod (3-3) is fixed on the frame (2); the pressing plate (3-4) is slidably mounted on the screw rod (3-3); the hand wheel (3-5) is mounted on the screw rod (3-3) via a thread; the hand wheel (3-5) is in contact with the pressing plate (3-4); and a groove (3-7) adapted to the seat is provided on the pressing plate (3-4).

11. A device for testing the mechanical properties of a chair leg rest according to claim 9, characterized in that: The chair foot fixing member (3-2) is provided with a universal wheel sleeve (3-6) adapted to the universal wheel of the seat, and the chair foot fixing member (3-2) is provided with a waist-shaped adjustment groove (3-8), which is connected to the frame (2) via screws.

12. The device for testing the mechanical properties of a chair leg rest according to claim 9, characterized in that: A plurality of mounting screw holes (2-3) are evenly distributed on the bottom of the frame (2), and the pressing assembly (3-1) and the chair leg fixing member (3-2) are fixed to the frame (2) via the mounting screw holes (2-3).

13. A method for testing the mechanical properties of a chair leg rest according to any one of claims 1 to 12, characterized in that: The following steps are included: Step 1: Fix the seat on the test device and adjust the leg rest to extend out of the seat; Step 2, setting a plurality of test points on the leg rest component according to the position of the user's legs placed on the leg rest component; Step 3: Perform static and cyclic dynamic tests on the seat through a test device; in the static test, perform functional and destructive tests on the leg rest at each test point; in the cyclic dynamic test, repeatedly apply load to each test point through the test device; Step 4: Inspect the leg rest after testing.

Images