TWM661643U - Curved surface friction testing device - Google Patents

Abstract

A curved surface friction testing device has a first clamp applied to provide a pulling force to an object along a length direction; a second clamp applied to provide a clamping force to the object; a testing space with a bionic liquid therein, at least one part of the second clamp is immersed in the bionic liquid to simulate a usage environment of the object; and a sensor applied to detect a sensing data which is generated when the object is pulled by the first clamp.

Description

Curved surface friction test device

A friction testing device, in particular a curved surface friction testing device.

The current technology mainly refers to "ASTM D1894 Test Method for Static and Dynamic Friction Coefficients of Plastic Film and Sheet" to measure the static and dynamic friction coefficients of the surface of plastic film, sheet, rubber, etc. The method used to detect surface friction is mostly to use a universal material testing machine or a stretching device to drag the sheet/plate material relative to a test base plate to calculate its surface static and dynamic friction coefficients.

However, the above-mentioned testing methods are mostly based on flat plates, and all use flat friction methods to obtain the static and dynamic friction coefficients of the surface. If a test object has a curved surface (such as invasive equipment such as medical catheters or guide wires), it is necessary to process it into a flat shape with the same material before testing the friction coefficient of the surface. Not only does it increase the manufacturing cost and process, but the shape made for the test is not the same as the actual test object, which can easily lead to the problem that the quality of the test object cannot be confirmed.

In view of this, in order to develop a friction testing technology that can avoid manufacturing costs and process burdens and is applicable to a test object with a curved surface, the present invention provides a curved surface friction testing device, including a stretching part, a clamping part and a simulation device arranged along a length direction from top to bottom, wherein the stretching part includes a first clamp, the first clamp can be displaced relative to the clamping part along the length direction, and the first clamp is used to provide a curved surface friction test device. A pulling force is applied to an object to be tested on a surface of a test piece along the length direction; the clamping portion includes a second clamp, and the second clamp is used to provide a clamping force to the object to be tested; the simulation device includes a containing space, a bionic fluid is arranged in the containing space, and at least a part of the second clamp is immersed in the bionic fluid to simulate a use scenario of the object to be tested when in use; and a sensor is used to detect a sensing data generated when the first clamp pulls the object to be tested.

Wherein, the second clamp includes a bionic pad on a side corresponding to the clamping of the object to be tested.

The bionic pad is an elastic body including rubber or silicone.

The surface of the bionic pad includes a concave-convex structure.

Furthermore, a temperature control device is included to provide the second fixture and/or the simulation device with a temperature condition corresponding to the usage scenario.

Furthermore, a control center provides a test instruction to the stretching part, the clamping part and the simulation device by wire or wirelessly, and the test instruction includes the tension of the first clamp, a displacement speed of the first clamp, the clamping force of the second clamp and a temperature condition corresponding to the use scenario provided to the second clamp and/or the simulation device.

The control center includes a database recording at least one test condition, the test condition corresponds to the use scenario, including the bionic pad corresponding to the test condition, a pad friction coefficient corresponding to the bionic pad, the clamping force, the type of bionic fluid, the position of the second clamp relative to the bionic fluid, the temperature condition, and a test logic. The control center provides the test instruction according to the test condition and the test logic.

The clamping force of the second clamp corresponds to the pressure received by the object to be tested in the usage scenario.

The pulling force and/or displacement speed of the first clamp corresponds to the pulling force or speed of the object to be tested in the usage scenario.

Among them, the stretching part is a common universal material machine or a stretching equipment.

The advantages of this new model are:

1. By immersing at least a portion of the second fixture in the bionic fluid, the use scenario of the object to be tested can be simulated.

2. The arc surface friction testing device can provide appropriate testing conditions for different objects to be tested, avoiding the problem of the quality of the object to be tested being uncertain due to standardized testing conditions.

3. According to the test conditions, select the bionic pad, the pulling force of the first clamp, the displacement speed of the first clamp, the clamping force of the second clamp and the temperature conditions suitable for the test object, so as to accurately detect the surface static friction and/or dynamic friction that may be generated by the bionic pad during the expected use.

10: Stretching section

11: First clamp

20: Clamping part

21: Second clamp

22: Bionic pad

30:Simulation device

31: Storage space

32: Bionic fluid

40: Control Center

41: Database

42:Sensor

43: Temperature control equipment

A: Items to be tested

Figure 1 is a three-dimensional cross-sectional view of a preferred example provided by the present invention.

Figure 2 is a diagram of the preferred example usage status provided by the new model.

Figure 3 is a block diagram of a preferred example system provided by the present invention.

Figure 4 is a diagram of experimental data of a preferred example provided by the present invention.

Please refer to Figures 1 to 3, which are preferred embodiments of the arc surface friction test device provided by the present invention, which includes a stretching portion 10, a clamping portion 20 and a simulation device 30, which are arranged from top to bottom along a length direction, and a control center 40 is used to provide a test command wired or wirelessly to adjust the stretching portion 10, the clamping portion 20 and the simulation device 30.

The stretching part 10 includes a first clamp 11, and the first clamp 11 can be displaced along the length direction by the control center 40 to approach or move away from the clamping part 20. The arc surface friction testing device clamps a test object A with an arc surface through the first clamp 11 of the stretching part 10, and the first clamp 11 applies a pulling force to drag the test object A to move relative to the clamping part 20 along the length direction.

The clamping portion 20 includes a second clamp 21, at least a portion of which is disposed in the simulation device 30. The second clamp 21 clamps the object A to be tested and applies a clamping force to the object A to be tested.

The object A to be tested can be a roughly cylindrical material such as a rod or a tube. Preferably, the object A to be tested is a medical catheter, guide wire or prosthesis.

The stretching part 10 can be a common universal material machine or a stretching device. The stretching part 10, the clamping part 20, the simulation device 30 and the control center 40 are a detachable combination.

Among them, the second clamp 21 includes a bionic pad 22 on a side corresponding to the clamping of the object A to be tested, so as to simulate a usage scenario when the object A to be tested is pulled relative to a biological body.

For example, the bionic pad 22 can be an elastic body such as rubber, silicone, etc. to simulate the elastic characteristics of human skin or organs; or the surface of the bionic pad 22 is formed with a concave-convex structure to simulate the surface of the human body such as the esophagus and intestines with concave-convex patterns.

The simulation device 30 includes a containing space 31, a bionic fluid 32 is disposed in the containing space 31, and at least a portion of the second fixture 21 is immersed in the bionic fluid 32 to simulate the use scenario of the object A to be tested when in use.

For example, another part of the second fixture 21 protrudes from the liquid surface of the bionic fluid 32 to simulate the usage scenario of the object A to be tested moving from inside the organism to outside the organism (or vice versa) across different environments. Or when the entire second fixture 21 is immersed in the bionic fluid 32, the usage scenario of the object A to be tested moving inside the organism can be simulated.

Please refer to FIG. 3 , the control center 40 includes a database 41 , at least one sensor 42 , and a temperature control device 43 , wherein the temperature control device 43 provides a temperature condition for the second fixture 21 and/or the simulation device 30 to achieve the effect of accurately simulating the usage scenario. .

The database 41 records at least one test condition, which is determined according to the expected usage scenario of the object A to be tested, and records the bionic pad corresponding to the test condition, a pad friction coefficient corresponding to the bionic pad, the clamping force, the type of the bionic fluid 32, the position of the second clamp 21 relative to the bionic fluid 32, the temperature condition, and a test logic.

The sensor 42 is used to detect a sensing data such as a resistance or a moving distance per unit time generated when the first clamp 11 pulls the object A to be tested, and transmit the sensing data to the control center 40.

The control center 40 determines the test instruction according to the selection of the test condition and the test logic. The test instruction includes the tension of the first clamp 11, the displacement speed of the first clamp 11, the clamping force of the second clamp 21, and the temperature condition of the second clamp 21 and/or the simulation device 30 provided by the temperature control device 43. By adjusting or changing the tension of the first clamp 11 and/or the clamping force of the second clamp 21 in the test instruction, the surface static friction coefficient and/or dynamic friction coefficient generated by the object A to be tested corresponding to the test condition can be measured.

It is worth noting that the setting of the clamping force of the second clamp 21 can simulate the pressure provided by the test object A in the test condition corresponding to the use scenario, such as being wrapped, squeezed or pressed by the biological tissue. The pulling force or displacement speed provided by the first clamp 11 can also simulate the force or speed applied by the medical staff when pulling the test object A in the test condition.

In addition, whether at least a portion of the second clamp 21 is immersed in the bionic fluid 32 also has a great difference in the static friction coefficient and/or dynamic friction coefficient of the surface of the object A to be tested. The present invention detects the difference in friction coefficient of a polyvinyl chloride pipe at 2 cm below the surface of the bionic fluid 32 and at 2 cm above the surface of the bionic fluid 32 when the polyvinyl chloride pipe is displaced relative to the second clamp under the same pulling force and displacement speed provided by the first clamp 11 and the same clamping force provided by the second clamp 21. The polyvinyl chloride pipe is continuously displaced, and the dynamic friction coefficient of the polyvinyl chloride pipe at 2 cm below the surface of the bionic fluid 32 and at 2 cm above the surface of the bionic fluid 32 is obtained for each 1 cm movement of the polyvinyl chloride pipe. As shown in Figure 3, the dynamic friction coefficient of the polyvinyl chloride pipe at 2 cm above the surface of the bionic fluid 32 and the dynamic friction measured below the surface of the bionic fluid 32 of the polyvinyl chloride pipe are significantly different when the polyvinyl chloride pipe is 4 cm away from the start. It can be seen that the positional relationship between the second fixture 21 and the bionic fluid 32 is extremely important for the use scenario of the test object A when in use. The values of the static friction coefficient and/or dynamic friction coefficient of the test object A detected by the second fixture 21 below the surface of the bionic fluid 32 and on the surface of the bionic fluid 32 can be used to select the reference value trend of the static friction coefficient and/or dynamic friction coefficient of the surface according to the purpose of the test object A (such as the purpose of use inside or outside the body).

The advantages of this new model are:

1. Through the positional relationship of at least a portion of the second fixture 21 being immersed in the bionic fluid 32, the use scenario of the object A to be tested is simulated.

2. The arc surface friction testing device can provide appropriate testing conditions for different objects A to be tested, avoiding the problem of the quality of the object to be tested being uncertain due to standardized testing conditions.

3. According to the test conditions, select the bionic pad, the pulling force of the first clamp 11, the displacement speed of the first clamp 11, the clamping force of the second clamp 21 and the temperature conditions suitable for the object A to be tested, so as to accurately detect the surface static friction and/or dynamic friction that may be generated by the bionic pad during the expected use.

20: Clamping part

21: Second clamp

22: Bionic pad

30:Simulation device

31: Storage space

Claims (10)

A curved surface friction testing device comprises a stretching part, a clamping part and a simulation device arranged along a length direction from top to bottom, wherein: the stretching part comprises a first clamp, the first clamp can be displaced relative to the clamping part along the length direction, the first clamp is used to provide a tensile force along the length direction to a test object with a curved surface; the clamping part comprises a second clamp, the second clamp is used to provide a clamping force to the test object; and the simulation device comprises a containing space, a bionic fluid is arranged in the containing space, at least a part of the second clamp is immersed in the bionic fluid, simulating a use scenario of the test object when in use; and a sensor is used to detect a sensing data generated when the first clamp pulls the test object. As described in claim 1, the arc surface friction testing device includes a bionic pad on a side of the second fixture corresponding to the clamping of the object to be tested. In the arc surface friction testing device described in claim 2, the bionic pad is an elastic body including rubber or silicone. As described in claim 2, the arc surface friction testing device, the surface of the bionic pad includes a concave-convex structure. The arc surface friction testing device as described in claim 1 includes a temperature control device to provide the second fixture and/or the simulation device with a temperature condition corresponding to the usage scenario. The arc surface friction test device as described in any one of claim items 1 to 5 includes a control center that provides a test instruction to the stretching part, the clamping part and the simulation device wired or wirelessly, and the test instruction includes the tension of the first clamp, a displacement speed of the first clamp, the clamping force of the second clamp, and a temperature condition corresponding to the use scenario provided to the second clamp and/or the simulation device. As described in claim 6, the control center includes a database recording at least one test condition, the test condition corresponding to the use scenario, including a bionic pad corresponding to the test condition and arranged on a side of the second clamp corresponding to the clamping of the object to be tested, a pad friction coefficient corresponding to the bionic pad, the clamping force, the type of bionic fluid, the position of the second clamp relative to the bionic fluid, the temperature condition, and a test logic, and the control center provides the test instruction according to the test condition and the test logic. In the arc surface friction testing device as described in claim 7, the clamping force of the second clamp corresponds to the pressure received by the object to be tested in the usage scenario. For the arc surface friction testing device as described in claim 7, the pulling force and/or displacement speed of the first clamp corresponds to the pulling force or speed of the object to be tested in the usage scenario. As for the arc surface friction testing device described in claim 7, the stretching part is a common universal material machine or a stretching device.

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