Novel controllable arm support movement device

Abstract

The utility model relates to a novel controllable arm support movement device which comprises a three-dimensional force sensor, a sensor shell and an arm support, one end of the three-dimensional force sensor is sleeved with the sensor shell, the other end of the three-dimensional force sensor is connected with a host, and the arm support is rotationally arranged at the end, away from the three-dimensional force sensor, of the sensor shell; an L-shaped elastic body is arranged in the three-dimensional force sensor, a strain gauge and supporting shafts are arranged in the L-shaped elastic body, the supporting shafts are arranged on one side of the strain gauge at intervals, one end of each supporting shaft is in interference fit with the L-shaped elastic body, and the other end of each supporting shaft is in clearance fit with a hole of the L-shaped elastic body. The three-dimensional force sensor has the effects of limiting excessive deformation of the elastic body and protecting the three-dimensional force sensor.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a novel controllable arm support movement device. Background Technology

[0002] For patients with arm injuries or neurological disorders (such as stroke, hemiplegia, etc.), arm support exercise devices can provide targeted rehabilitation training. They assist patients in performing passive movements, gradually restoring muscle strength, joint range of motion, and motor coordination in the arm.

[0003] A strain gauge 3D force sensor is a sensor capable of simultaneously measuring the magnitude and direction of the force acting on an object in three-dimensional space (X, Y, and Z directions). To measure forces in three-dimensional space, strain gauge 3D force sensors typically employ a combination of multiple strain gauges. These strain gauges are distributed at different locations on the elastic body in a specific layout to simultaneously detect force components in all three directions. In rehabilitation equipment, strain gauge 3D force sensors can measure the patient's motor forces and force feedback during rehabilitation training, providing a scientific basis for rehabilitation treatment.

[0004] Currently, the sensor has certain drawbacks in use. When the arm moves, if the load is too large, the elastic body will deform too much, which will damage the strain gauge or circuit board inside the sensor. This will cause one or more of the three degrees of freedom of the arm to be unable to rotate, making it impossible to interact with computer games. Utility Model Content

[0005] In order to limit excessive deformation of the elastomer and protect the strain-type three-dimensional force sensor, this application provides a novel controllable arm support motion device.

[0006] The novel controllable armrest motion device provided in this application adopts the following technical solution:

[0007] A novel controllable arm support motion device is characterized by comprising a three-dimensional force sensor, a sensor housing, and an arm support. The sensor housing is fitted onto one end of the three-dimensional force sensor, and the other end of the three-dimensional force sensor is connected to a main unit. The arm support is rotatably mounted on the end of the sensor housing facing away from the three-dimensional force sensor. An L-shaped elastic body is disposed inside the three-dimensional force sensor. A strain gauge and a support shaft are disposed inside the L-shaped elastic body. The support shaft is disposed on one side of the strain gauge. One end of the support shaft is interference-fitted with the L-shaped elastic body, and the other end is clearance-fitted with a hole in the L-shaped elastic body.

[0008] The L-shaped elastic body has a through cavity, and the inner sidewalls of the through cavity are respectively provided with a front hole and a rear hole. One end of the support shaft is interference-fitted with the front hole, and the other end is clearance-fitted with the rear hole.

[0009] The support shaft is in interference fit with the L-shaped elastic body at one end and in clearance fit with the L-shaped elastic body hole at the other end.

[0010] The front hole has a smaller diameter than the rear hole.

[0011] The support shaft has an angle with the deformation direction of the strain gauge.

[0012] In summary, the present application has at least one of the following beneficial technical effects:

[0013] By setting the support shaft in the L-shaped elastic body, the one end of the support shaft is in interference fit with the L-shaped elastic body, and the other end is in clearance fit with the L-shaped elastic body hole, thereby limiting the deformation of the elastic body, so that the elastic body deforms in a small space, and the three-dimensional force sensor can be protected from being damaged by excessive deformation. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application.

[0015] Figure 2 is a schematic diagram of the structure of the L-shaped elastic body in the embodiment of the present application.

[0016] Figure 3 is a schematic diagram of the structure of the L-shaped elastic body in the embodiment of the present application.

[0017] BRIEF DESCRIPTION OF DRAWINGS 1. Three-dimensional force sensor; 2. Sensor shell; 3. Arm support; 4. L-shaped elastic body; 41. Cavity; 5. Strain gauge; 6. Front hole; 7. Rear hole; 8. Support shaft. DETAILED DESCRIPTION

[0018] The following will be described in detail with reference to the accompanying drawings. Figures 1-3 The present application will be further described in detail.

[0019] The embodiment of the present application discloses a novel controllable arm support movement device. Referring to Figure 1 and Figure 2, the arm support movement device comprises a three-dimensional force sensor 1, a sensor shell 2 and an arm support 3, the three-dimensional force sensor 1 and the sensor shell 2 are both in a cylindrical structure, the three-dimensional force sensor 1 is detachably fixed at one end of the sensor shell 2 through bolts, the other end of the three-dimensional force sensor 1 is connected with a host computer, three motors are connected on the host computer, the three motors control three different directions (up and down, left and right and rotation) respectively, and the three-degree-of-freedom direction movement is realized through the motors. The arm support 3 is rotationally arranged at the end of the sensor shell 2 away from the three-dimensional force sensor 1, and a patient can place the upper limbs on the arm support 3 to perform rehabilitation training. The L-shaped elastic body 4 is fixedly arranged in the three-dimensional force sensor 1 through bolts, the material of the L-shaped elastic body 4 is 2024-T4 in the embodiment, three through cavities 41 are formed in the L-shaped elastic body 4, and strain gauges 5 are welded in the three through cavities 41. When the patient places the upper limbs on the arm support 3, the L-shaped elastic body 4 in the sensor shell 2 changes and deforms due to stress, the strain gauges 5 also deform, so that the resistance value changes, the three-dimensional force sensor 1 is connected with the host computer, the three-dimensional force sensor 1 transmits signals to the host computer through the resistance value change, and the host computer is operated by one motor or multiple motors at the same time, so that the three-degree-of-freedom direction movement of the arm support 3 is realized. The through cavity 41 is further provided with a supporting shaft 8, the material of the supporting shaft 8 is 05Cr17Ni4Cu4Nb in the embodiment, the supporting shaft 8 is located at one side of the strain gauge 5, the supporting shaft 8 is arranged in a spaced mode between the side wall of the strain gauge 5 and the side wall of the supporting shaft 8, and the length extension direction of the supporting shaft 8 and the deformation direction of the strain gauge 5 are arranged in a certain angle, and the perpendicular arrangement is adopted in the embodiment. In addition, one end of the supporting shaft 8 is in interference fit with the L-shaped elastic body 4, and the other end is in clearance fit with the L-shaped elastic body 4.

[0020] With reference to Figure 3 The front hole 6 and the rear hole 7 are arranged on the relatively symmetrical inner side walls of the through cavity 41, the front hole 6 and the rear hole 7 are arranged in a concentric mode, the hole diameter of the front hole 6 is smaller than that of the rear hole 7, and the two ends of the supporting shaft 8 are respectively inserted into the front hole 6 and the rear hole 7, one end of the supporting shaft 8 is in interference fit with the front hole 6, and the other end is in clearance fit with the rear hole 7, the clearance value of the clearance fit is between 0.1mm and 0.25mm, and the optimal value is 0.1mm. When the L-shaped elastic body 4 and the strain gauge 5 are deformed by force in a certain direction, the clearance fit can provide a certain deformation space for the supporting shaft 8, the supporting shaft 8 arranged in the perpendicular direction of the strain gauge 5 can provide a reverse force to the L-shaped elastic body 4, so as to limit the L-shaped elastic body 4 from being excessively deformed due to excessive load, prevent the strain gauge 5 or the circuit board from being damaged, and further protect the three-dimensional force sensor 1 and prolong the service life.

[0021] The above are preferred embodiments of the application, and do not limit the protection scope of the application, therefore: any equivalent changes made on the structure, shape and principle of the application should be covered in the protection scope of the application.

Claims

1. A novel controllable arm rest movement device characterized by: The application relates to a three-dimensional force sensor, which comprises a three-dimensional force sensor (1), a sensor shell (2) and an arm support (3), the sensor shell (2) is sleeved on one end of the three-dimensional force sensor (1), the other end of the three-dimensional force sensor (1) is connected with a host computer, and the end of the sensor shell (2) away from the three-dimensional force sensor (1) is rotationally provided with the arm support (3); an L-shaped elastic body (4) is arranged in the three-dimensional force sensor (1), a strain gauge (5) and a supporting shaft (8) are arranged in the L-shaped elastic body (4), the supporting shaft (8) is arranged on one side of the strain gauge (5) in a spaced mode, one end of the supporting shaft (8) is in interference fit with the L-shaped elastic body (4), and the other end of the supporting shaft (8) is in clearance fit with a hole of the L-shaped elastic body (4).

2. A novel controllable armrest motion device according to claim 1, characterized in that: A through cavity (41) is formed in the L-shaped elastic body (4), front and rear holes (6 and 7) are respectively formed in the opposite inner side walls of the through cavity (41), one end of the supporting shaft (8) is in interference fit with the front hole (6), and the other end of the supporting shaft (8) is in clearance fit with the rear hole (7).

3. A novel controllable armrest motion device according to claim 2, characterized in that: The clearance value between the one end of the supporting shaft (8) and the rear hole (7) is 0.1-0.25mm.

4. A novel controllable armrest motion device according to claim 2, characterized in that: The front and rear holes (6 and 7) are concentrically arranged, and the diameter of the front hole (6) is smaller than that of the rear hole (7).

5. A novel controllable armrest motion device according to claim 1, characterized in that: The length extension direction of the supporting shaft (8) and the deformation direction of the strain gauge (5) form an included angle.

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