Deflector rod torsion measuring tool

Abstract

The utility model provides a deflector rod torsion measuring tool which can provide accurate and reliable data for deflector rod torsion of a whole endoscope so as to formulate an acceptable deflector rod torsion standard range of the endoscope. The deflector rod torsion measuring tool comprises a fixing assembly which is provided with a positioning cavity used for fixedly installing an endoscope and an opening which is communicated with the positioning cavity and used for allowing a deflector rod of the endoscope to move; the bearing assembly comprises a bearing outer ring fixedly arranged on the fixing assembly and a bearing inner ring rotatably arranged on the bearing outer ring; the lead screw assembly comprises a lead screw shaft sleeve fixedly connected with the bearing inner ring, a lead screw nut fixedly connected with the lead screw shaft sleeve and a lead screw rod which is in threaded connection with the lead screw nut and is used for being connected with a tension arm of the tensile machine; the push rod assembly comprises a rotating arm fixedly connected with the lead screw nut and a pushing arm which is fixedly connected with the rotating arm, stretches into the opening and is used for pushing the shifting rod.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a lever torque measuring fixture. Background Technology

[0002] Currently, most medical endoscopes use a manual lever on the operating part to rotate up and down, which drives the traction wire to bend the serpentine bone left and right, thereby controlling the direction and angle of the insertion tip of the endoscope, allowing the tip lens to obtain a wider field of view and image.

[0003] However, currently, the torque of a manual lever is usually sensed by hand, meaning there is no quantification of the torque or an acceptable standard range for it. Although some devices exist for testing endoscopic torque, they primarily use torque meters, which are not only structurally complex but also have unpredictable frictional forces at various levels, leading to inaccurate measurement results. Utility Model Content

[0004] To address the issue of inaccurate measurement results in existing endoscopic torque testing devices, this application provides a lever torque measuring fixture that can provide accurate and reliable data on the lever torque of the entire endoscope, thereby enabling the establishment of an acceptable lever torque standard range for endoscopes.

[0005] According to one aspect of this application, one embodiment provides a lever torque measuring fixture for measuring the lever torque of an endoscope using a tensile testing machine, comprising:

[0006] The fixing assembly has a positioning cavity for fixing the endoscope and an opening communicating with the positioning cavity for allowing the lever of the endoscope to move.

[0007] A bearing assembly includes an outer bearing ring fixed to the fixed assembly and an inner bearing ring rotatably disposed on the outer bearing ring;

[0008] A lead screw assembly includes a lead screw bushing fixedly connected to the inner ring of the bearing, a lead screw nut fixedly connected to the lead screw bushing, and a lead screw threadedly connected to the lead screw nut and used for connection to the tension arm of the tension testing machine; and

[0009] The push rod assembly includes a rotating arm fixedly connected to the lead screw nut and a push arm fixedly connected to the rotating arm and extending into the opening for pushing the lever.

[0010] According to some embodiments of this application, the bearing assembly is arranged coaxially with the lead screw assembly to correspond to the rotation center of the endoscope lever.

[0011] According to some embodiments of this application, the fixing assembly includes a base plate for fixing by a clamping tool of the tensile testing machine, a cover plate having the opening, and a bracket mounted on the cover plate to fix the outer ring of the bearing; the cover plate is detachably placed on the base plate to form the positioning cavity for fixing the endoscope.

[0012] According to some embodiments of this application, the fixing component further includes at least two positioning posts protruding from the cover plate; the bracket is sleeved on the positioning posts to position and fix the bracket to the cover plate.

[0013] According to some embodiments of this application, the bearing assembly further includes an upper bearing pressure plate located on the upper side of the outer ring of the bearing and a lower bearing pressure plate located on the lower side of the inner ring of the bearing; the upper bearing pressure plate is fixedly connected to the bracket to fix the outer ring of the bearing relative to the bracket; the lower bearing pressure plate is fixedly connected to the lead screw bushing to fix the inner ring of the bearing relative to the lead screw bushing.

[0014] According to some embodiments of this application, the bearing assembly further includes bearing balls rotatably disposed between the outer ring and the inner ring of the bearing to form a two-way thrust ball bearing.

[0015] According to some embodiments of this application, the lead screw assembly is a ball screw.

[0016] According to some embodiments of this application, one end of the rotating arm is fitted onto the lead screw nut and fixedly connected to the lead screw bushing; the other end of the rotating arm is fixedly connected to the push arm.

[0017] According to some embodiments of this application, the rotating arm extends radially outward along the lead screw, and the pushing arm extends axially downward along the lead screw.

[0018] According to some embodiments of this application, the other end of the rotating arm is provided with an arc-shaped groove for mounting the push arm.

[0019] In summary, when the tension arm of the tensile testing machine pulls the lead screw up and down, the lead screw nut rotates clockwise or counterclockwise in a plane under the action of the lead screw. This rotation, via the rotating arm, drives the pushing arm to rotate clockwise or counterclockwise in a plane, thereby pushing the endoscope's lever to rotate clockwise or counterclockwise in a plane. During this process, the lever torque measuring fixture of this application converts the endoscope's lever torque into the tension force of the tensile testing machine. Based on the tension curve measured by the tensile testing machine, the torque curve of the lever can be obtained accordingly, which is beneficial for the analysis of measurement data and the technical improvement of endoscope products.

[0020] Furthermore, to eliminate the influence of factors such as friction and component weight within the tooling, this application, when measuring the torque of the endoscope lever using a lever torque measuring tool, can first perform a no-load measurement without inserting the endoscope to obtain an initial calibration value F0 for the tensile testing machine. Then, with the endoscope inserted, a real-load measurement is performed to obtain a measured tensile force value F. The actual tensile force ΔF applied by the tensile testing machine relative to the endoscope lever is equal to the difference between the measured tensile force value F and the initial calibration value F0. This allows the real-time torque curve of the lever to be obtained based on the actual tensile force curve, effectively eliminating the influence of factors such as friction and component weight within the tooling, obtaining accurate and reliable lever torque measurement results, and facilitating the establishment of an acceptable lever torque standard range for endoscopes. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of the state of a lever torque measuring fixture provided in one embodiment of this application undergoing a tensile measurement;

[0023] Figure 2 It shows Figure 1 An exploded view of the lever torque measuring fixture shown.

[0024] Figure 3 It shows Figure 1 A three-dimensional sectional view of the lever torque measuring fixture shown.

[0025] Figure 4 A schematic diagram showing the state of the lever torque measuring fixture according to the above embodiments of this application performing a no-load measurement;

[0026] Figure 5 It shows Figure 4 A cross-sectional schematic diagram of the lever torque measuring fixture shown;

[0027] Figure 6 It shows Figure 5 A magnified schematic diagram of part A in the lever torque measuring fixture shown;

[0028] Figure 7 This is a flowchart illustrating a lever torque measurement method according to an embodiment of this application;

[0029] Figure 8An example of the pull-out measurement step in the lever torque measurement method according to the above embodiments of this application is shown.

[0030] Figure label:

[0031] 1. Torque measuring fixture for lever; 10. Fixing assembly; 101. Positioning cavity; 102. Opening; 11. Base plate; 12. Cover plate; 13. Bracket; 14. Positioning post; 20. Bearing assembly; 21. Bearing outer ring; 22. Bearing inner ring; 23. Bearing ball; 24. Upper bearing pressure plate; 25. Lower bearing pressure plate; 30. Lead screw assembly; 31. Lead screw bushing; 32. Lead screw nut; 33. Lead screw thread; 40. Push rod assembly; 41. Rotating arm; 410. Arc groove; 42. Push arm; 2. Endoscope; 3. Lever. Detailed Implementation

[0032] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0033] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0037] Considering that most devices currently on the market for testing endoscopic torque use torque meters, which are not only complex in structure but also make it impossible to estimate the magnitude of frictional forces at various levels within the device, resulting in inaccurate measurement results, this application provides a lever torque measuring fixture that can provide accurate and reliable data on the lever torque of the entire endoscope, in order to establish an acceptable standard range for endoscope lever torque.

[0038] Specifically, please refer to Figures 1 to 6 One embodiment of this application provides a lever torque measuring fixture 1, which can convert torque into tension, so as to measure the lever torque of the endoscope 2 by means of a tension testing machine (not shown in the figure), without the need for a torque meter / torque wrench, thus preventing the problem of inaccurate measurement results due to the torque meter's inability to estimate the friction forces at various levels. It is understood that the tension testing machine mentioned in this application can be, but is not limited to, a vertical tension testing machine, which can be driven by a computer to move the tension arm up and down to obtain the tension curve of the tension arm.

[0039] More specifically, such as Figures 1 to 6As shown, the lever torque measuring fixture 1 may include a fixing assembly 10, a bearing assembly 20, a lead screw assembly 30, and a push rod assembly 40. The fixing assembly 10 has a positioning cavity 101 for fixing the endoscope 2 and an opening 102 communicating with the positioning cavity 101 and for allowing the lever 3 of the endoscope 2 to move. The bearing assembly 20 includes a bearing outer ring 21 fixed to the fixing assembly 10 and a bearing inner ring 22 rotatably disposed on the bearing outer ring 21. The lead screw assembly 30 includes a lead screw bushing 31 fixedly connected to the bearing inner ring 22, a lead screw nut 32 fixedly connected to the lead screw bushing 31, and a lead screw 33 threadedly connected to the lead screw nut 32 and for connecting to the tension arm of the tension testing machine. The push rod assembly 40 includes a rotating arm 41 fixedly connected to the lead screw nut 32 and a push arm 42 fixedly connected to the rotating arm 41 and extending into the opening 102 for pushing the lever. It is understood that the fixed connection mentioned in this application can be a direct connection via fasteners such as screws, or an indirect connection via an intermediate medium, as long as the two are relatively fixed. This application will not elaborate further on this. In addition, the tension arm mentioned in this application can be connected to the lead screw 33 by means of clamping, but is not limited to clamping. As long as the lead screw 33 can be pushed and pulled to move up and down, this application will not elaborate further on this.

[0040] Thus, as Figure 3 As shown, when the tension arm of the tension testing machine pulls the lead screw 33 up and down, the lead screw nut 32 rotates clockwise or counterclockwise on a plane under the action of the lead screw 33. This, in turn, drives the push arm 42 to rotate clockwise or counterclockwise on a plane via the rotating arm 41, thereby pushing the lever 3 of the endoscope 2 to rotate clockwise or counterclockwise on a plane. During this process, the lever torque measuring fixture 1 of this application converts the lever torque of the endoscope 2 into the tension of the tension testing machine. Based on the tension curve measured by the tension testing machine, the torque curve of the lever 3 can be obtained accordingly, which is beneficial for the analysis of measurement data and the technical improvement of endoscope products.

[0041] It is worth noting that, in order to eliminate the influence of factors such as friction and component weight inside the tooling, when measuring the lever torque of the endoscope 2 using the lever torque measuring tooling 1, this application can first perform a no-load measurement without inserting the endoscope 2 to obtain an initial calibration value F0 for the tensile testing machine. Then, with the endoscope 2 inserted, a real-load measurement can be performed to obtain a tensile force measurement value F. The actual tensile force ΔF applied by the tensile testing machine relative to the lever 3 of the endoscope 2 is equal to the difference between the tensile force measurement value F and the initial calibration value F0, i.e., ΔF = F - F0. This allows the real-time torque curve of the lever 3 to be obtained based on the actual tensile force curve, effectively eliminating the influence of factors such as friction and component weight inside the tooling, obtaining accurate and reliable lever torque measurement results, and facilitating the establishment of an acceptable lever torque standard range for endoscopes.

[0042] For example, such as Figure 3 and Figure 6 As shown, the bearing assembly 20 and the lead screw assembly 30 are arranged coaxially and are used to correspond to the rotation center of the lever of the endoscope 2 fixed in the positioning cavity 101, so that the rotation centers of the bearing inner ring 22, the lead screw nut 32 and the push rod assembly 40 are substantially coincident (designed to be completely coincident, and the manufacturing and assembly gap is negligible) at the rotation center of the lever of the endoscope 2, so as to simplify the conversion relationship between the torque of the lever 3 and the tension of the tensioning machine.

[0043] For example, such as Figure 3 As shown, f1 is the frictional force between the lead screw 33 and the lead screw nut 32, and the distance from the point of force application to the center of rotation is R1; f2 is the frictional force between the inner ring 22 and the outer ring 21 of the bearing, and the distance from the point of force application to the center of rotation is R2; F' is the torque of the lever of the endoscope 2, and the distance from the point of force application to the center of rotation is R'; F is the pulling force of the tension arm of the tensioning machine pulling the lead screw 33; G is the weight of the lead screw 33; P is the lead of the lead screw 33, that is, when the lead screw 33 moves one lead, the lead screw nut 32 rotates one revolution; PI represents pi.

[0044] like Figures 1 to 3 As shown, when endoscope 2 is inserted for tensile measurement, the following equation (1) can be obtained according to the principle of energy conservation:

[0045] F×P-G(×P=f1×2Pi×R1+f2×2Pi×R2+F’×2Pi×R’ (1)

[0046] like Figures 4 to 6 As shown, when endoscope 2 is not inserted for empty pull measurement, F' = 0; at this time, according to the principle of energy conservation, the following equation (2) can be obtained:

[0047] F0×P-G×P=f1×2Pi×R1+f2×2Pi×R2 (2)

[0048] Then, by subtracting equation (1) and equation (2) above, we can obtain equation (3) below:

[0049] (F-F0)×P=F'×2Pi×R' (3)

[0050] From equation (3) above, we can easily obtain equation (4) below:

[0051] F'=(F-F0)×P / (2Pi×R')=ΔF×P / (2Pi×R') (4)

[0052] In the formula: F' is the torque of the lever of endoscope 2; ΔF is the actual pulling force; P is the lead of the lead screw 33; Pi is pi; R' is the lever arm of endoscope 2 (i.e., the distance from the point of force application of the lever to the center of rotation).

[0053] In summary, since the lead P of the lead screw 33 is a design constant; pi is a known constant; and the distance R' from the force point of the lever to the rotation center is a fixed value of the endoscope 2 and can be directly measured, the lever torque F' of the endoscope 2 is directly proportional to the actual tensile force ΔF of the tensile testing machine. The actual tensile force ΔF of the tensile testing machine is equal to the difference between the measured tensile force F and the initial calibration value F0, which can be obtained through the tensile testing machine. Therefore, the lever torque curve of the endoscope 2 can be accurately calculated using the above formula (4) to obtain the real-time torque of the lever 3.

[0054] It is worth noting that since the lead P of the lead screw 33 is often much smaller than 2Pi×R', the actual tensile force ΔF of the tensile testing machine will be much larger than the lever torque of the endoscope 2. Therefore, the lever torque measuring fixture 1 of this application can greatly amplify the measured value so as to accurately measure the smaller lever torque.

[0055] Optionally, such as Figure 2 and Figure 5 As shown, the shape of the positioning cavity 101 matches the shape of the operating part of the endoscope 2 to position the endoscope 2 placed in the cavity, so that the lever 3 of the endoscope 2 is aligned with the opening 102 so that it can be pushed by the push arm 42 that extends into the opening 102.

[0056] Optionally, such as Figures 2 to 5As shown, the fixing assembly 10 includes a base plate 11 for being fixed by the clamping tool of the tensile testing machine, a cover plate 12 with the opening 102, and a bracket 13 mounted on the cover plate 12 to fix the outer ring 21 of the bearing. The cover plate 12 is detachably placed on the base plate 11 to form a positioning cavity 101 for positioning and fixing the endoscope 2. Thus, when the cover plate 12 is removed from the base plate 11, the positioning cavity 101 is opened to allow for the placement and removal of different endoscopes 2. When the cover plate 12 is installed on the base plate 11, the operating part of the endoscope 2 is clamped and fixed between the base plate 11 and the cover plate 12 to be positioned and fixed in the positioning cavity 101, ensuring that the lever 3 of the endoscope 2 is aligned with the opening 102 for easy pushing by the push arm 42. It is understood that the cover plate 12 mentioned in this application can be detachably fixed to the base plate 11 by means of five M8 internal hex screws.

[0057] Optionally, such as Figures 2 to 4 As shown, the fixing assembly 10 also includes at least two positioning posts 14 protruding from the cover plate 12; the bracket 13 is sleeved on the positioning posts 14 so as to position and fix the bracket 13 to the cover plate 12 by screws, thereby ensuring that the rotation center of the bearing inner ring 22 coincides with the rotation center of the lever 3. It is understood that the bracket 13 mentioned in this application can be, but is not limited to, fixed to the cover plate 12 by two M8 internal hexagonal screws.

[0058] Optionally, such as Figure 3 and Figure 6 As shown, the bearing assembly 20 also includes bearing balls 23 that are rotatably disposed between the outer ring 21 and the inner ring 22 of the bearing to form a standard double-direction thrust ball bearing. This facilitates the reduction of the frictional force f (shaft) when the inner ring 22 rotates relative to the outer ring 21 of the bearing, while also serving as a load-bearing component for axial thrust and pull forces. This prevents the tooling from failing under huge thrust and pull forces and improves the reliability of the overall structure.

[0059] Optionally, such as Figure 3 and Figure 6 As shown, the bearing assembly 20 also includes an upper bearing pressure plate 24 located on the upper side of the outer ring 21 of the bearing and a lower bearing pressure plate 25 located on the lower side of the inner ring 22 of the bearing. The upper bearing pressure plate 24 is fixedly connected to the bracket 13 to fix the outer ring 21 of the bearing relative to the bracket 13; the lower bearing pressure plate 25 is fixedly connected to the lead screw bushing 31 to fix the inner ring 22 of the bearing relative to the lead screw bushing 31. It is understood that the upper bearing pressure plate 24 mentioned in this application can be fixed to the bracket 13 by three M3 hexagon socket head cap screws; the lower bearing pressure plate 25 mentioned in this application can be fixed to the lead screw bushing 31 by two M3 hexagon socket head cap screws.

[0060] According to the above embodiments of this application, the lead screw assembly 30 is implemented as a ball screw, so as to use a ball screw with high maturity and accuracy as the key conversion component of the lever torque measuring fixture 1, which is beneficial to improve the accuracy and reliability of the measurement results while simplifying the fixture structure.

[0061] Optionally, such as Figure 2 , Figure 3 as well as Figure 4 As shown, one end of the rotating arm 41 is fitted onto the lead screw nut 32 and fixedly connected to the lead screw bushing 31, while the other end of the rotating arm 41 is fixedly connected to the push arm 42. This allows the rotating arm 41 to drive the push arm 42 to rotate within a plane under the influence of the lead screw nut 32, thereby pushing the lever 3 of the endoscope 2. It is understood that the rotating arm 41 mentioned in this application can be, but is not limited to, fixed to the lead screw bushing 31 with four M3 hexagon socket head cap screws; the push arm 42 mentioned in this application can be, but is not limited to, fixed to the rotating arm 41 with one M3 hexagon socket head cap screw.

[0062] Optionally, such as Figure 3 and Figure 5 As shown, the rotating arm 41 extends outward along the radial direction of the lead screw 33, and the pushing arm 42 extends downward along the axial direction of the lead screw 33, so that the pushing arm 42 rotates in a plane perpendicular to the axial direction of the lead screw 33, so as to push the lever 3 to rotate clockwise or counterclockwise in only one plane.

[0063] Optionally, such as Figure 3 and Figure 4 As shown, the other end of the rotating arm 41 has an arc-shaped groove 410 for mounting the push arm 42, so that the mounting position of the push arm 42 on the rotating arm 41 can be adjusted along the arc-shaped groove 410, thereby adjusting the distance between the push arm 42 and the lead screw sleeve 31 according to the position of the lever of the endoscope 2, so as to ensure that the push arm 42 can accurately push the lever 3. It can be understood that the push arm 42 of this application is fixed to the rotating arm 41 by an M3 internal hex screw passing through the arc-shaped groove 410, so that the mounting position of the push arm 42 can be adjusted as needed.

[0064] In addition, the opening 102 of the fixing component 10 is implemented as a fan-shaped opening so as to minimize the opening area on the cover plate 12 while matching the rotation requirements of the lever 3, thus reserving sufficient positioning and fixing space for the bracket 13.

[0065] It is worth noting that the lever torque measuring fixture 1 of this application has a simple overall structure and low cost; it can measure different types of endoscopes by simply replacing the base plate 11 and / or the cover plate 12, which has good versatility and can measure lever torque accurately and reliably in real time.

[0066] It is worth mentioning that, according to another aspect of this application, such as Figure 7 As shown, one embodiment of this application further provides a method for measuring the torque of a lever, which may include the following steps:

[0067] S100: Before inserting the endoscope into the positioning cavity of the lever torque measuring fixture, the lever torque measuring fixture is subjected to a no-load tension measurement using a tensile testing machine to obtain the initial calibration value.

[0068] S200: After the endoscope is inserted into the positioning cavity of the lever torque measuring fixture, the lever torque measuring fixture is subjected to a tensile test using the tensile testing machine to obtain the tensile force measurement value; and

[0069] S300: Based on the initial calibration value and the tensile force measurement value, the torque of the endoscope lever is calculated using the torsion-tension conversion model.

[0070] It is worth noting that the torsion-tension conversion model mentioned in this application can be implemented as follows:

[0071] F'=(F-F0)×P / (2Pi×R');

[0072] Where: F' is the torque of the endoscope lever; F is the measured tensile force; F0 is the initial calibration value; P is the lead of the lead screw in the lever torque measuring fixture; Pi is pi; R' is the lever arm of the endoscope.

[0073] It is worth noting that, in one example of this application, such as Figure 8 As shown, step S200 in the lever torque measurement method of this application includes the following steps:

[0074] S210: Drive the tension arm of the tension tester to move up and down, thereby driving the lead screw in the lever torque measuring fixture to move up and down, so that the up and down movement of the lead screw is converted into the rotational movement of the lead screw nut in the lever torque measuring fixture.

[0075] S220: The lead screw nut drives the push rod assembly in the torque measuring fixture to rotate on a plane, so that the push arm in the push rod assembly pushes the endoscope's lever to rotate synchronously; and

[0076] S230: The data measured by the tensile testing machine can be displayed and / or saved in real time via a computer.

[0077] Furthermore, the lever torque measurement method of this application can be used in conjunction with a computer-driven tensile testing machine to enable the measurement data to be displayed and / or saved in real time, which is beneficial for data analysis and technical improvement of endoscope products.

[0078] The technical features of the above embodiments can be combined without changing the basic principles of this application. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above embodiments are merely illustrative of several implementation methods of this application, and their descriptions are quite specific and detailed. However, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A lever torque measurement tool, characterized in that, A lever torque for measuring endoscope torque via a tensile testing machine includes: The fixing assembly has a positioning cavity for fixing the endoscope and an opening communicating with the positioning cavity for allowing the lever of the endoscope to move. A bearing assembly includes an outer bearing ring fixed to the fixed assembly and an inner bearing ring rotatably disposed on the outer bearing ring; A lead screw assembly includes a lead screw bushing fixedly connected to the inner ring of the bearing, a lead screw nut fixedly connected to the lead screw bushing, and a lead screw threadedly connected to the lead screw nut and used for connection to the tension arm of the tension testing machine; and The push rod assembly includes a rotating arm fixedly connected to the lead screw nut and a push arm fixedly connected to the rotating arm and extending into the opening for pushing the lever.

2. The lever torsion measurement tool of claim 1, wherein, The bearing assembly is arranged coaxially with the lead screw assembly and is used to correspond to the rotation center of the endoscope lever.

3. The lever torsion measurement tool of claim 1, wherein, The fixing assembly includes a base plate for being fixed by the clamping tool of the tensile testing machine, a cover plate having the opening, and a bracket mounted on the cover plate to fix the outer ring of the bearing; the cover plate is detachably placed on the base plate to form the positioning cavity for fixing the endoscope.

4. The lever torsion measurement tooling of claim 3, wherein, The fixing component further includes at least two positioning posts protruding from the cover plate; the bracket is sleeved on the positioning posts to position and fix the bracket to the cover plate.

5. The lever torsion measurement tooling of claim 3, wherein, The bearing assembly further includes an upper bearing pressure plate located on the upper side of the outer ring of the bearing and a lower bearing pressure plate located on the lower side of the inner ring of the bearing; the upper bearing pressure plate is fixedly connected to the bracket to fix the outer ring of the bearing relative to the bracket; the lower bearing pressure plate is fixedly connected to the lead screw bushing to fix the inner ring of the bearing relative to the lead screw bushing.

6. The lever torsion measurement tool of any one of claims 1 to 5, wherein, The bearing assembly also includes bearing balls that are rotatably disposed between the outer ring and the inner ring of the bearing to form a two-way thrust ball bearing.

7. The lever torsion measurement tool of any one of claims 1 to 5, wherein, The lead screw assembly is a ball screw.

8. The lever torsion measurement tool of any one of claims 1 to 5, wherein, One end of the rotating arm is fitted onto the lead screw nut and fixedly connected to the lead screw bushing; the other end of the rotating arm is fixedly connected to the push arm.

9. The lever torsion measurement tooling of claim 8, wherein, The rotating arm extends radially outward along the lead screw, and the pushing arm extends axially downward along the lead screw.

10. The lever torsion measurement tool of claim 9, wherein, The other end of the rotating arm has an arc-shaped groove for mounting the push arm.

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