Chair back-and-forth swing durability testing device

Abstract

A chair back-and-forth swing durability testing device belongs to the technical field of testing of mechanical parts. The testing device comprises a supporting frame, a testing platform arranged at the bottom of the supporting frame, two chair leg limiting pieces arranged on the testing platform and used for limiting a chair to move front and back respectively, a linear driving device transversely arranged in the supporting frame, a chair back pushing piece arranged at the output end of the linear driving device, and a chair bearing balance weight. The device can effectively simulate the condition that a user drives the chair to swing back and forth, and meets the test requirements of the scene.

Description

Technical Field

[0001] This utility model relates to the field of mechanical component testing technology, and in particular to a structural durability testing device for a chair after repeated back-and-forth swinging. Background Technology

[0002] Currently, in order to meet various user needs, it is necessary to test the durability of chairs under various usage conditions. For example, Chinese utility model patent with patent number ZL202320550223.X discloses a dining chair leg durability testing machine, which can limit and fix the dining table legs to prevent them from sliding during shaking, improve the stability during testing, simulate the state of a diner sitting on the dining chair and swaying from side to side, and test the shear resistance performance of the connection between the chair legs and the seat and the chair legs.

[0003] However, the aforementioned testing machine can only test the situation where the user swings the chair from side to side. In actual use, there may be situations where the user moves the chair back and forth, that is, when the chair is supported only by the two front legs or the two back legs. Existing technology lacks a device to test this scenario. Utility Model Content

[0004] The purpose of this invention is to solve the problems existing in the prior art and provide a chair back-and-forth swing durability testing device, which can effectively simulate the situation where a user drives the chair to swing back and forth, and meet the testing requirements of this scenario.

[0005] The objective of this utility model is achieved through the following technical solution:

[0006] A chair back-and-forth swing durability testing device includes a support frame, a test platform located at the bottom of the support frame, two chair leg limiters located on the test platform for limiting the back-and-forth movement of the chair, a linear drive device located laterally within the support frame, a chair back pusher located at the output end of the linear drive device, and a chair load-bearing counterweight.

[0007] Preferably, the chair leg limiting component includes a mounting plate, a baffle, and fastening bolts, with mounting holes for the fastening bolts provided on both the mounting plate and the test platform.

[0008] Preferably, the mounting holes on the mounting plate are strip-shaped holes along the front-to-back direction of the chair.

[0009] Preferably, the test platform is provided with multiple mounting holes.

[0010] Preferably, the chair back pusher includes a connecting plate, two pushers spaced apart on the lower side of the connecting plate, and rollers disposed on opposite sides of the two pushers. The connecting plate is connected to the output end of the linear drive device.

[0011] Preferably, each pusher is provided with at least two rollers arranged vertically.

[0012] Preferably, the linear drive device is an electric slide table.

[0013] Preferably, the support frame is provided with a lifting drive mechanism, and the output end of the lifting drive mechanism is connected to the linear drive device.

[0014] Preferably, the lifting drive mechanism includes two lifting screws disposed on opposite sides of the support frame, lifting nuts disposed at opposite ends of the linear drive device, and a motor driving one of the lifting screws. The two lifting screws are connected at the bottom of the test platform via a gear and rack transmission.

[0015] Preferably, an electrical control cabinet is provided on the side of the support frame, and a control display screen is provided on the support frame. The control display screen is electrically connected to the electrical control cabinet, and the electrical control cabinet is electrically connected to the linear drive device and the lifting drive mechanism.

[0016] The advantages of this utility model are:

[0017] 1. By moving the chair back horizontally, the chair is pushed to swing back and forth, so as to effectively test the durability of the chair in this usage scenario;

[0018] 2. The chair leg limiting component has a large adjustment range for installation position, and the linear drive device has an adjustable height, to ensure that this device can meet the testing needs of chairs of various specifications.

[0019] 3. By setting rollers on the backrest pusher, the frictional resistance between the backrest and the chair back is avoided from affecting the smoothness and stability of the test. Attached Figure Description

[0020] Figure 1 A front view of a chair back-and-forth swing durability testing device provided in an embodiment of this specification;

[0021] Figure 2 This is a structural schematic diagram of the chair back pusher provided in the embodiments of this specification;

[0022] Figure 3 This is a structural diagram showing the installation state of the chair leg positioning component provided in the embodiments of this specification;

[0023] Figure 4 This is a schematic diagram of the lifting drive mechanism provided in the embodiments of this specification;

[0024] In the diagram: 1-Support frame; 2-Test platform; 3-Chair leg limiting component; 31-Mounting plate; 32-Baffle; 33-Fastening bolt; 4-Linear drive device; 5-Chair back pusher; 51-Connecting plate; 52-Push frame; 53-Roller; 6-Chair load-bearing counterweight; 71-Lifting screw; 72-Lifting nut; 73-Motor; 74-Guide rod; 8-Electrical control cabinet; 9-Control display screen. Detailed Implementation

[0025] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] As mentioned in the background section, the testing machine presses the chair down with pressure blocks and applies lateral force to the chair legs to test the shear resistance of the connection between the chair legs and seat, as well as the chair legs. Therefore, in this testing machine, the chair legs cannot be raised, meaning it cannot simulate the situation where the front leg or the rear leg of the chair is supported independently.

[0027] Therefore, such as Figure 1As shown, this embodiment provides a chair back-and-forth swing durability testing device, including a support frame 1, a test platform 2 located at the bottom of the support frame 1, two chair leg limiting members 3 located on the test platform 2 to restrict the back-and-forth movement of the chair, a linear drive device 4 horizontally located within the support frame 1, a chair back pusher 5 located at the output end of the linear drive device 4, and a chair load-bearing counterweight 6. During testing: the chair to be tested is placed on the test platform 2, with the back-and-forth direction of the chair aligned with the movement direction of the output end of the linear drive device 4; then, the two chair leg limiting members 3 are adjusted to the front and rear sides of the chair to restrict the chair's back-and-forth movement along the test platform without affecting the raising of the chair legs, i.e., a certain gap needs to be maintained between the chair leg limiting members and the chair legs, rather than a tight fit; next, a chair load-bearing counterweight 6 of the required weight is placed on the chair seat to simulate a user of the corresponding weight; finally, the linear drive device 4 is activated, causing the linear drive device 4 to drive the chair back pusher 5 back and forth to push the chair back, raising the front or rear legs of the chair. Specifically, the backrest pusher 5 can be a unidirectional backrest pusher structure, for example, pushing the backrest forward only, causing the two front legs to support the chair while the two rear legs are raised. The backrest pusher then returns to its original position, and the chair returns to a stable state. This action is repeated to complete the required number of tests. Alternatively, the backrest pusher 5 can be a bidirectional backrest pusher structure, for example, pushing the backrest forward and then backward to switch from a state where the two front legs support the chair to a state where the two rear legs support the chair. This cycle is repeated a required number of times to complete the test. After completing the set number of cycles, the stability of the chair structure can be observed to see if it meets the requirements. Both testing methods can be selected according to actual testing needs. Furthermore, the degree of leg raising can be adjusted by the movement of the backrest pusher. For example, the legs can be raised by 40mm. To reduce the raising degree, the movement of the backrest pusher can be reduced accordingly.

[0028] like Figure 2As shown, to meet the requirement of bidirectional pushing of the chair back, the chair back pushing component 5 includes a connecting plate 51, two pushers 52 spaced apart on the lower side of the connecting plate 51, and rollers 53 on the opposite sides of the two pushers 52. The connecting plate 51 is connected to the output end of the linear drive device 4. Thus, during testing, when the chair back is placed between the two pushers 52, the two pushers 52 can push the chair back forward or backward to swing back and forth as the chair back pushing component moves back and forth. At the same time, since a certain vertical relative displacement will occur between the chair back and the pushers 52 during the swinging process, in order to avoid excessive frictional resistance between the two affecting the smoothness and stability of the test, rollers 53 are provided on the side of the pushers 52 that contacts the chair back, so as to greatly reduce the frictional resistance between the pushers and the chair back. In addition, since the contact area between the same push frame and the chair back changes when the chair back is swinging in two directions, taking the left push frame as an example, when the chair back swings to the left, the upper part of the left push frame is the part that mainly contacts the chair back, while when the chair back swings to the right, the lower part of the left push frame is the part that mainly contacts the chair back. Therefore, in order to ensure that the push frame 52 and the chair back can enjoy the drag reduction effect brought by the rollers throughout the entire swing process, the push frame 52 is provided with three rollers 53 evenly arranged vertically.

[0029] like Figure 3 As shown, the chair leg limiting component 3 includes a mounting plate 31, a baffle 32, and fastening bolts 33. Both the mounting plate 31 and the test platform 2 have mounting holes for the fastening bolts 33. The baffle 32 is perpendicular to the mounting plate 31. In use, the baffle 32 is positioned closer to the chair leg, while the mounting plate 31 is positioned away from the chair leg to prevent the fastening bolts 33 from affecting the chair leg. To ensure the stability of the chair leg limiting component 3's position, two fastening bolts 33 are generally provided. To facilitate adjustment of the chair leg limiting component 3's installation position to meet the testing requirements of chairs of different specifications, the test platform 2 is evenly distributed with numerous mounting holes. The chair leg limiting component 3 can be installed in any position as needed. Furthermore, the mounting holes on the mounting plate 31 are strip-shaped holes along the front-to-back direction of the chair to accurately adjust the position of the chair leg limiting component.

[0030] like Figure 4As shown, due to the differences in backrest height among chairs of different specifications, a lifting drive mechanism is provided on the support frame 1 to ensure applicability. The output end of the lifting drive mechanism is connected to the linear drive device 4. Specifically, the lifting drive mechanism can adopt a screw lifting structure, mainly including two lifting screws 71 located on opposite sides of the support frame 1, lifting nuts 72 located at opposite ends of the linear drive device 4, and a motor 73 driving one of the lifting screws. The two lifting screws 71 are connected to the bottom of the test platform 2 via a gear and rack transmission. Guide rods 74 are also provided between the two ends of the linear drive device 4 and the support frame 1. During operation, the motor 73 synchronously drives the two lifting screws 71 to rotate. The lifting screws 71, through their cooperation with the lifting nuts 72, drive the linear drive device 4 to rise and fall. The linear drive device 4 can specifically be an electric slide table to meet the requirements of the movement range.

[0031] Finally, an electrical control cabinet 8 is installed on the side of the support frame 1, and a control display screen 9 is installed on the support frame 1. The control display screen 9 is electrically connected to the electrical control cabinet 8, and the electrical control cabinet 8 is electrically connected to the linear drive device 4 and the lifting drive mechanism. The test can be controlled via the control display screen, for example, by setting the number of cycles.

[0032] The above are merely preferred embodiments of this utility model, and are implementations based on the overall concept of this utility model. Furthermore, the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A chair back-and-forth swing durability testing device, characterized in that, It includes a support frame, a test platform located at the bottom of the support frame, two chair leg limiters located on the test platform for limiting the forward and backward movement of the chair, a linear drive device located laterally within the support frame, a backrest pusher located at the output end of the linear drive device, and a chair load-bearing counterweight.

2. The chair back-and-forth swing durability test device according to claim 1, characterized by, The chair leg limiting component includes a mounting plate, a baffle, and fastening bolts. Both the mounting plate and the test platform are provided with mounting holes for the fastening bolts.

3. The chair back-and-forth swing durability test device according to claim 2, characterized by The mounting holes on the mounting plate are strip-shaped holes running along the front-to-back direction of the chair.

4. The chair back-and-forth swinging durability test device according to claim 2, characterized by The test platform is equipped with multiple mounting holes.

5. The chair back-and-forth swinging durability test device according to claim 1, wherein The chair back pusher includes a connecting plate, two pushers spaced apart on the lower side of the connecting plate, and rollers on opposite sides of the two pushers. The connecting plate is connected to the output end of the linear drive device.

6. The chair back-and-forth swinging durability test device according to claim 5, wherein Each of the pushers is provided with at least two rollers arranged vertically.

7. The chair back-and-forth swing durability test device according to claim 1, characterized by The linear drive device is an electric slide table.

8. The chair back-and-forth swing durability test device according to claim 1, characterized by The support frame is equipped with a lifting drive mechanism, and the output end of the lifting drive mechanism is connected to the linear drive device.

9. The chair back-and-forth swinging durability test device according to claim 8, characterized by The lifting drive mechanism includes two lifting screws located on opposite sides of the support frame, lifting nuts located at opposite ends of the linear drive device, and a motor that drives one of the lifting screws. The two lifting screws are connected at the bottom of the test platform via a gear and rack transmission.

10. The chair back-and-forth swing durability test device according to claim 8, characterized by An electrical control cabinet is provided on the side of the support frame, and a control display screen is provided on the support frame. The control display screen is electrically connected to the electrical control cabinet, and the electrical control cabinet is electrically connected to the linear drive device and the lifting drive mechanism.

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