Wheelchair bed fatigue test device
By designing a wheelchair bed fatigue testing device and using controllers and stroke switches to detect the conversion structure of the wheelchair bed, the problem of difficulty in evaluating its durability in the prior art is solved, and effective testing of the performance of the wheelchair bed is achieved.
Patent Information
- Application Number
- CN202422587497.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-25
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-10-25
AI Technical Summary
The prior art is difficult to effectively test whether the conversion structure of the wheelchair bed can maintain the extension limit after multiple use and whether each component is deformed, which affects the durability and service life of the product.
A wheelchair bed fatigue testing device is designed, including a test base, a fixing mechanism, a stroke switch and a controller. The electric push rod is controlled by the controller to realize the conversion action of the wheelchair bed, and the stroke switch is used to record the number of conversion times to detect the performance of the conversion structure.
It realizes effective testing of the performance and service life of the wheelchair bed conversion structure to ensure that it can still work properly after multiple uses.
Smart Images
Figure CN223272188U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of product quality testing equipment, in particular to a wheelchair bed fatigue testing device. Background Art
[0002] A wheelchair bed is a new nursing product that combines a wheelchair and a bed structure. It generally consists of a wheelchair main frame and a seating part that can be extended into a bed. The bed and wheelchair can be converted by controlling the electric push rod to drive the action mechanism. The wheelchair bed fatigue test is an important step in testing the performance of the wheelchair bed product. The rotating connection structure of the wheelchair bed is an important component for the product conversion. Whether it can still reach the extension limit position after multiple extensions, and whether the various components of the wheelchair bed are deformed during movement, will have a significant impact on the durability and service life of the product. Therefore, it is crucial to design a wheelchair bed fatigue test device to test its performance. Utility Model Content
[0003] The purpose of the utility model is to provide a wheelchair bed fatigue test device with reasonable structural design, which can effectively perform performance tests on the conversion structure of the wheelchair bed.
[0004] In order to achieve the above-mentioned purpose of the invention, the technical solution adopted by the present utility model is:
[0005] A wheelchair bed fatigue test device includes a test base, a fixing mechanism, a travel switch, and a controller. The test base is provided with multiple rows of threaded holes. The fixing mechanism includes a long screw and a pressure plate. The pressure plate is in an inverted U-shape and can be in contact and connected with the cross beams on both sides of the wheelchair bed. A hole is provided on one side of the pressure plate for passing the long screw. The lower end of the long screw is connected to the threaded hole. The travel switch is arranged on one side of the test base and connected to the controller circuit. The travel switch is in movable contact with the end of the wheelchair bed in the extended state.
[0006] Furthermore, a rubber pad is provided at the lower end of the pressure plate to prevent the pressure plate from being in hard contact with the wheelchair bed beam.
[0007] The controller is connected to the electric push rod through a cable and can control the conversion action of the wheelchair bed.
[0008] The travel switch is a counting switch with a counting screen display function.
[0009] The travel switch is fixed by a bracket, which is provided with a plurality of mounting holes at different heights to facilitate adjustment of the height of the travel switch. The bracket is connected to the test base by bolts, and its position is adjustable to adapt to different test distances.
[0010] The controller is set on one side of the test base, uses STM32-F103 chip, and controls the interval opening of the electric push rod through the relay circuit.
[0011] Working principle: The electric push rod of the wheelchair bed is controlled by the controller circuit. When the wheelchair bed is converted into a bed body, it extends horizontally and one end of the bed touches the limit switch. Therefore, the number on the limit switch display increases once; when the wheelchair bed is extended or retracted, the tail end of the wheelchair bed drops and the limit switch contact returns to a horizontal state. When a problem occurs in the conversion mechanism, the limit switch is no longer triggered and the counting stops.
[0012] The beneficial effects of the utility model are:
[0013] The entire wheelchair bed fatigue test device has a simple and reasonable structure and can effectively test the performance or service life of the wheelchair bed conversion structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic structural diagram of an embodiment of the utility model;
[0015] Figure 2 Schematic diagram of the fixed mechanism structure;
[0016] Figure 3 The embodiment of the utility model is converted into a schematic diagram of the bed structure.
[0017] 1-test base, 2-travel switch, 3-controller, 4-long screw, 5-pressure plate, 6-crossbeam, 7-electric push rod, 8-bracket. DETAILED DESCRIPTION
[0018] The following is combined with Figure 1-3 The utility model is further described as follows:
[0019] like Figure 1-3 The wheelchair bed fatigue test device shown in the figure includes a test base 1, a fixing mechanism, a limit switch 2, and a controller 3. The test base 1 is provided with multiple rows of threaded holes. The fixing mechanism includes a long screw 4 and a pressure plate 5. The pressure plate 5 is in an inverted shape and can be in contact and connected with the cross beams 6 on both sides of the wheelchair bed. A hole is provided on one side of the pressure plate for passing the long screw 4. The lower end of the long screw 4 is connected to the threaded hole on the test base. The limit switch 2 is arranged on one side of the test base and is connected to the controller 3 circuit. The limit switch 2 is in active contact with the end of the wheelchair bed in the extended state.
[0020] Furthermore, a rubber pad is provided at the lower end of the pressing plate 5 to prevent the pressing plate from being in hard contact with the wheelchair bed crossbeam 6 .
[0021] The controller is connected to the electric push rod through a cable, and can control the conversion action of the wheelchair bed. Specifically, it is connected to the power input end of the electric push rod through a cable, and the action of the electric push rod 7 is controlled by the controller.
[0022] The travel switch is a counting switch with a counting screen display function, and the Bellemei brand model BEM-5X-7200-CT mechanical counter can be selected.
[0023] The travel switch is fixed by a bracket 8, which is provided with a plurality of mounting holes at different heights to facilitate adjustment of the height of the travel switch. The bracket is connected to the test base by bolts, and its position is adjustable to adapt to different test distances.
[0024] The controller is set on one side of the test base, and uses STM32-F103 chip to control the interval opening of the electric push rod through the relay circuit.
[0025] Working principle: The electric push rod of the wheelchair bed is controlled by the controller circuit. When the wheelchair bed is converted into a bed body, it extends horizontally and one end of the bed touches the limit switch. Therefore, the number on the limit switch display increases once; when the wheelchair bed is extended or retracted, the tail end of the wheelchair bed drops and the limit switch contact returns to a horizontal state. When a problem occurs in the conversion mechanism, the limit switch is no longer triggered and the counting stops. The count represents the service life of the action mechanism.
[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in the technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as within the scope of protection of the present invention without paying any creative labor.
Claims
1. A wheelchair bed fatigue test device, characterized by: It consists of a test base, a fixing mechanism, a travel switch, and a controller. The test base is provided with multiple rows of threaded holes. The fixing mechanism includes a long screw and a pressure plate. The pressure plate is in an inverted U-shape and can be in contact and connected with the cross beams on both sides of the wheelchair bed. A hole is provided on one side of the pressure plate for passing the long screw. The lower end of the long screw is connected to the threaded hole. The travel switch is arranged on one side of the test base and connected to the controller circuit. The travel switch is in movably contact with the end of the wheelchair bed in the extended state.
2. The wheelchair bed fatigue test device according to claim 1, characterized in that: A rubber pad is provided at the lower end of the pressure plate to prevent the pressure plate from coming into hard contact with the wheelchair bed beam.
3. The wheelchair bed fatigue testing device according to claim 1, characterized in that: The controller is connected to the electric push rod through a cable.
4. The wheelchair bed fatigue testing device according to claim 1, characterized in that: The travel switch is a counting switch with a counting screen display function.
5. The wheelchair bed fatigue testing device according to claim 1, characterized in that: The travel switch is fixed by a bracket, and the bracket is provided with a plurality of mounting holes at different heights to facilitate adjustment of the height of the travel switch. The bracket is connected to the test base by bolts.
6. The wheelchair bed fatigue test device according to claim 3, characterized in that: The controller is set on one side of the test base, uses STM32-F103 chip, and controls the interval opening of the electric push rod through the relay circuit.