Chair wheel fatigue testing machine convenient for load adjustment

Abstract

The utility model discloses a chair wheel fatigue testing machine convenient to adjust load, comprising a base plate (1), the upper side of the base plate (1) is provided with a chair wheel driving mechanism whose height can be adjusted up and down, the chair wheel driving mechanism is provided with a horizontally arranged connecting plate (3), one side of the connecting plate (3) is provided with an installing plate (15) used for installing a chair wheel, and the installing plate (15) is provided with a load. A mounting column (17) for mounting a load (16) is arranged on the upper side of the mounting plate (15); a guide wheel groove (4) used for running of chair wheels is formed in the bottom plate (1), and clamping mechanisms are arranged on the two sides of the guide wheel groove (4). The accuracy of a test result can be improved.

Description

Technical Field

[0001] The utility model relates to a chair wheel fatigue testing machine, in particular to a chair wheel fatigue testing machine which is convenient for adjusting load. Background Art

[0002] Caster fatigue testing is a test method to evaluate the performance and durability of wheels after long-term use. This test is often used to evaluate the service life and safety of wheels in various applications, such as office chairs, luggage, trolleys, etc. The test process usually includes the examination of wheel rolling, steering, load-bearing capacity under simulated use conditions to simulate various conditions in the actual use environment. At present, test equipment usually performs rolling tests on chair wheels. Existing equipment mainly performs rolling tests on chair wheels on rotating disks, rollers and other equipment.

[0003] For example, the patent with application number 202221458502.5 discloses a durability tester for PE casters, which discloses that a caster groove is opened at the center of the top of the test bench, and support frames are fixedly connected to both ends of the top of the test bench. A driving mechanism is arranged on the top of the support frame, and a moving component is arranged on the outside of the driving mechanism. However, during the test, the load needs to be adjusted to test the fatigue strength of the chair wheels under different loads. A counterweight block will be set on the limit rod to adjust the load of the chair wheels. However, in the process of increasing the counterweight load, the load on the caster is not simply the gravity of the caster and the counterweight block, but will also be affected by the moving component, resulting in inaccurate test results. Utility Model Content

[0004] The purpose of the utility model is to provide a chair wheel fatigue testing machine that is easy to adjust the load, which can improve the accuracy of the test results.

[0005] The technical solution of the utility model is: a chair wheel fatigue testing machine which is easy to adjust the load, comprising a base plate, a chair wheel driving mechanism with adjustable height up and down is provided on the upper side of the base plate, a horizontally arranged connecting plate is provided on the chair wheel driving mechanism, a mounting plate for mounting the chair wheel is provided on one side of the connecting plate, and a mounting column for mounting the load is provided on the upper side of the mounting plate; a guide wheel groove for the movement of the chair wheel is provided in the base plate, and clamping mechanisms are provided on both sides of the guide wheel groove.

[0006] In the aforementioned chair wheel fatigue testing machine that is easy to adjust the load, the chair wheel driving mechanism includes a horizontally arranged fixed frame, a reciprocating screw and a guide rod are provided in the middle of the fixed frame, a motor for driving the reciprocating screw to rotate is provided outside the fixed frame, a screw seat connected to the connecting plate is provided on the reciprocating screw and the guide rod, and a hydraulic rod for adjusting the height of the fixed frame is provided on the lower side of the fixed frame.

[0007] In the aforementioned chair wheel fatigue testing machine that is easy to adjust the load, the clamping mechanism includes a bidirectional screw rod arranged in the bottom plate, and the bidirectional screw rod is provided with a clamping block through a screw rod seat.

[0008] In the aforementioned chair wheel fatigue testing machine that is easy to adjust the load, the upper end of the bottom plate is provided with a guide groove corresponding to the clamping block.

[0009] In the aforementioned chair wheel fatigue testing machine that is easy to adjust the load, a tenon is provided at the end of the connecting plate.

[0010] In the aforementioned chair wheel fatigue testing machine that is easy to adjust the load, the mounting plate is provided with a tenon groove corresponding to the tenon.

[0011] Compared with the prior art, the utility model drives the caster to perform reciprocating motion through the chair wheel driving mechanism to test the fatigue strength of the caster. The chair wheel load can be changed by setting a load on the mounting column outer surface of the mounting plate, and the connecting plate is arranged horizontally to avoid providing support for the chair wheel and affecting the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model.

[0013] The markings in the attached drawings are: 1-base plate, 3-connecting plate, 4-guide wheel groove, 5-fixed frame, 6-reciprocating screw, 7-guide rod, 8-motor, 9-screw seat, 10-hydraulic rod, 11-bidirectional screw, 12-clamping block, 13-guide groove, 14-tenon, 15-mounting plate, 16-load, 17-mounting column, 18-tenon groove. DETAILED DESCRIPTION

[0014] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0015] Embodiment. A chair wheel fatigue testing machine that is easy to adjust the load, comprising: Figure 1 As shown, it includes a base plate 1, and a chair wheel driving mechanism with adjustable height is provided on the upper side of the base plate 1, a horizontally arranged connecting plate 3 is provided on the chair wheel driving mechanism, a mounting plate 15 for mounting chair wheels is provided on one side of the connecting plate 3, and a mounting column 17 for mounting a load 16 is provided on the upper side of the mounting plate 15; a guide wheel groove 4 for the movement of the chair wheels is provided in the base plate 1, and clamping mechanisms are provided on both sides of the guide wheel groove 4.

[0016] The chair wheel driving mechanism includes a horizontally arranged fixed frame 5, a reciprocating screw 6 and a guide rod 7 are provided in the middle of the fixed frame 5, a motor 8 is provided outside the fixed frame 5 to drive the reciprocating screw 6 to rotate, a screw seat 9 connected to the connecting plate 3 is provided on the reciprocating screw 6 and the guide rod 7, and a hydraulic rod 10 for adjusting the height of the fixed frame 5 is provided on the lower side of the fixed frame 5.

[0017] The clamping mechanism comprises a bidirectional screw rod 11 arranged in the base plate 1 , and the bidirectional screw rod 11 is provided with a clamping block 12 through a screw rod seat 9 .

[0018] The upper end of the bottom plate 1 is provided with a guide groove 13 corresponding to the clamping block 12 .

[0019] The end of the connecting plate 3 is provided with a tenon 14 .

[0020] The mounting plate 15 is provided with a tenon groove 18 corresponding to the tenon 14 .

[0021] Principle of the utility model: As shown in the patent described in the background technology, the existing equipment drives the chair wheel to move through the moving assembly, and the counterweight block is set in the moving assembly. During the process of changing the counterweight, the force of the screw and other components on the moving assembly will change, which increases the variable. The chair wheel load variable is not just the change in the weight of the counterweight block, which leads to inaccurate measurement results. The chair wheel of the present application is installed under the mounting plate 15, and the mounting plate 15 is provided with a mounting column 17 on the upper side. During testing, a load 16 can be added to the mounting column 17 to achieve load adjustment. During adjustment, the connecting plate 3 is separated from the mounting plate 15, and the chair wheel is clamped by the clamping mechanism. The clamping block 12 is driven to move by the bidirectional screw 11 to clamp the chair wheel. Due to the cooperation between the clamping block 12 and the guide groove 13, the clamping block 12 cannot rotate, so no guide rod is provided. The clamping mechanism can make the chair wheel in a vertically upright state, while preventing the vertical force from affecting the load size. At this time, the fixing frame 5 is raised and lowered according to the height of the mounting plate 15. The height adjustment of the fixing frame 5 is achieved through the hydraulic rod 10, and the height adjustment of the fixing frame 5 can also be driven by setting a vertically arranged screw in the bracket. Since this is a prior art, it will not be described in detail. The height adjustment of the fixing frame 5 is to enable the connecting plate 3 to be horizontally connected to the mounting plate, so that when the connecting plate drives the chair wheel to move, the connecting plate 3 will not generate a vertical force on the mounting plate 15, and the connecting plate 3 and the mounting plate 15 can be quickly connected through the tenon 14 and the tenon groove 18, which is more convenient for adjusting the load. In this application, the chair wheel driving mechanism cooperates with the connecting plate 3 to drive the chair wheel to reciprocate along the guide wheel groove, and the fatigue test of the chair wheel is performed. Not only is the load adjustment convenient, but the test results are also more accurate.

Claims

1. A chair wheel fatigue testing machine that is easy to adjust the load, characterized in that: The invention comprises a base plate (1), wherein the upper side of the base plate (1) is provided with a chair wheel driving mechanism capable of adjusting the height up and down, a horizontally arranged connecting plate (3) is provided on the chair wheel driving mechanism, a mounting plate (15) for mounting the chair wheels is provided on one side of the connecting plate (3), and a mounting column (17) for mounting a load (16) is provided on the upper side of the mounting plate (15); a guide wheel groove (4) for the movement of the chair wheels is provided in the base plate (1), and clamping mechanisms are provided on both sides of the guide wheel groove (4).

2. The chair wheel fatigue testing machine with easy load adjustment according to claim 1, characterized in that: The chair wheel driving mechanism comprises a horizontally arranged fixed frame (5), a reciprocating screw rod (6) and a guide rod (7) are arranged in the middle of the fixed frame (5), a motor (8) for driving the reciprocating screw rod (6) to rotate is arranged outside the fixed frame (5), a screw rod seat (9) connected to the connecting plate (3) is arranged on the reciprocating screw rod (6) and the guide rod (7), and a hydraulic rod (10) for adjusting the height of the fixed frame (5) is arranged on the lower side of the fixed frame (5).

3. The chair wheel fatigue testing machine with easy load adjustment according to claim 1, characterized in that: The clamping mechanism comprises a bidirectional screw rod (11) arranged in the bottom plate (1), and the bidirectional screw rod (11) is provided with a clamping block (12) via a screw rod seat (9).

4. The chair wheel fatigue testing machine with easy load adjustment according to claim 3, characterized in that: The upper end of the bottom plate (1) is provided with a guide groove (13) corresponding to the clamping block (12).

5. The chair wheel fatigue testing machine with easy load adjustment according to claim 1, characterized in that: The end of the connecting plate (3) is provided with a tenon (14).

6. The chair wheel fatigue testing machine with easy load adjustment according to claim 1, characterized in that: The mounting plate (15) is provided with a tenon groove (18) corresponding to the tenon (14).

Images