Mechanical joint clearance measuring instrument

Abstract

This invention relates to the field of measuring tools, specifically disclosing a mechanical joint clearance measuring device for measuring joint clearance. The joint includes a first swing member and a second swing member. The first swing member has a rotating shaft, and the second swing member has a rotating hole. The rotating shaft is inserted into the rotating hole and rotatably engages with the second swing member. The measuring device includes a first fixing member, a second fixing member, a probe, a resistive element, and a data processor. The first fixing member positions one of the probe and the resistive element on the rotating shaft and is coaxial with the rotating shaft. The second fixing member positions the other of the probe and the resistive element on the wall of the rotating hole of the second swing member and is coaxial with the rotating hole. The probe and the resistive element abut against each other. The probe is electrically connected to the data processor. The resistive element has at least three connecting lines spaced apart along its circumference, and these at least three connecting lines are electrically connected to the data processor. This measuring device can provide high-precision joint clearance values ​​and also visually display the changes in clearance at each part of the joint.

Description

Technical Field

[0001] This invention relates to the field of measuring tools, and more particularly to a mechanical joint clearance measuring device. Background Technology

[0002] In the field of mechanical manufacturing, various machine tools need to process parts under load. During the machining process, various machining errors exist, including assembly errors and structural errors. While current research has focused on various machine tool errors and proposed solutions, the errors caused by wear clearances in joints within mechanisms have been overlooked. These wear clearances cause deviations between the actual and ideal motion of the mechanism, reducing motion accuracy and part forming precision, while also generating vibration, noise, and potentially even damage or failure of the kinematic pairs.

[0003] In existing technologies, the wear clearance of mechanical joints is mostly measured using a dial indicator, with the measurer visually observing the changes in the dial indicator during the measurement process. This method suffers from significant measurement and observation errors, and it also fails to visually reveal the changes in clearance at each part of the joint.

[0004] Therefore, there is an urgent need for a mechanical joint wear clearance measuring instrument to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a mechanical joint gap measuring instrument to solve the problems of using a dial indicator for measurement in related technologies, which has the disadvantages of large measurement and observation errors and cannot intuitively show the changes in the gap of each part of the joint.

[0006] This invention provides a mechanical joint clearance measuring device for measuring joint clearance. The joint includes a first swing member and a second swing member. The first swing member is provided with a rotating shaft, and the second swing member is provided with a rotating hole. The rotating shaft is inserted into the rotating hole and rotates with the second swing member. The mechanical joint clearance measuring device includes a first fixing member, a second fixing member, a probe, a resistive element, and a data processor. The first fixing member is used to place one of the probe and the resistive element on the rotating shaft and coaxial with the rotating shaft. The second fixing member is used to place the other of the probe and the resistive element on the wall of the rotating hole and coaxial with the rotating hole. The probe and the resistive element abut against each other. The probe is electrically connected to the data processor. The resistive element has at least three connecting lines spaced apart along its circumference, and at least three of the connecting lines are electrically connected to the data processor.

[0007] As a preferred technical solution for measuring the gap between mechanical joints, the resistive element is circular.

[0008] As a preferred technical solution for a mechanical joint clearance measuring device, at least three of the connecting lines are connected to the resistor at equal angles to the center of the resistor.

[0009] As a preferred technical solution for a mechanical joint clearance measuring device, the first fixing member is an insulating stud, and the first fixing member is screwed to the rotating shaft.

[0010] As a preferred technical solution for a mechanical joint clearance measuring device, the second fixing member includes a base and a plurality of support legs. One end of the plurality of support legs is spaced apart on the base along the circumference. The second fixing member is disposed in the rotating hole, and the other end of the plurality of support legs abuts against the inner wall of the rotating hole.

[0011] As a preferred technical solution for a mechanical joint clearance measuring device, the supporting leg has a telescopic function.

[0012] As a preferred technical solution for the mechanical joint clearance measuring device, the second fixing member also includes multiple anti-slip pads, which are respectively disposed at the other end of the multiple supporting legs.

[0013] As a preferred technical solution for measuring the mechanical joint gap, the anti-slip pad is made of rubber.

[0014] As a preferred technical solution for a mechanical joint clearance measuring device, the probe slides in cooperation with the first fixing member along the axial direction of the rotating shaft, and a first elastic member is provided between the probe and the first fixing member, the first elastic member driving the probe to press the resistive sheet;

[0015] And / or, the resistive element slides along the axial direction of the rotating shaft with the second fixing member, and a second elastic element is provided between the resistive element and the second fixing member, the second elastic element driving the resistive element to press the probe.

[0016] As a preferred technical solution for a mechanical joint clearance measuring device, a display screen is also included, which is connected to the data processor.

[0017] The beneficial effects of this invention are as follows:

[0018] This invention provides a mechanical joint clearance measuring device for measuring joint clearance. The joint includes a first swing member and a second swing member. The first swing member is provided with a rotating shaft, and the second swing member is provided with a rotating hole. The rotating shaft is inserted into the rotating hole and rotates with the second swing member. The mechanical joint clearance measuring device includes a first fixing member, a second fixing member, a probe, a resistive element, and a data processor. The first fixing member is used to set one of the probe and the resistive element on the rotating shaft and arranged coaxially with the rotating shaft. The second fixing member is used to set the other of the probe and the resistive element on the wall of the rotating hole and arranged coaxially with the rotating hole. The probe and the resistive element abut against each other. The probe is electrically connected to the data processor. The resistive element is connected with at least three connecting lines at intervals along its circumference. The at least three connecting lines are electrically connected to the data processor. After the mechanical joint clearance measuring device is installed on the mechanical joint, the data processor can obtain the resistance value between each connecting wire and the probe. When there is a gap between the rotating shaft and the second swinging component, the probe and the resistance plate will move relative to each other, and the resistance value between the probe and each connecting wire will change. The data processor calculates the position change of the contact point between the probe and the circular resistance plate by calculating the change in resistance value, and then determines the joint wear clearance value between the second swinging component and the rotating shaft. This measuring device can provide high-precision joint clearance values ​​and can also intuitively show the changes in clearance of each part of the joint. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the mechanical joint clearance measuring device and the tube section in an embodiment of the present invention;

[0020] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0021] Figure 3 This is a cross-sectional view of the mechanical joint clearance measuring device and the tube section in an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the first fixing member and the probe in an embodiment of the present invention;

[0023] Figure 5 This is a schematic diagram of the structure of the second fixing member, the resistor sheet, and the connecting wire in an embodiment of the present invention.

[0024] In the picture:

[0025] 100. Joint; 101. Rotating shaft; 102. Second swing component; 1021. Rotating hole;

[0026] 1. Mechanical joint gap measuring device; 11. First fixing component; 12. Second fixing component; 121. Base; 122. Support leg; 123. Anti-slip pad; 124. Synchronization knob mechanism; 13. Probe; 14. Resistance element; 15. Connecting wire. Detailed Implementation

[0027] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions. Furthermore, "above," "on top of," and "over" the first feature in relation to the second feature includes the first feature directly above and diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "under," and "below" the first feature in relation to the second feature includes the first feature directly below and diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0029] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0031] like Figures 1-5As shown, this embodiment provides a mechanical joint gap measuring device for measuring the gap of a joint 100. The joint 100 includes a first swing member 101 and a second swing member 102. The first swing member 101 is provided with a rotating shaft, and the second swing member 102 is provided with a rotating hole 1021. The rotating shaft is inserted into the rotating hole 1021 and rotates with the second swing member 102. The mechanical joint gap measuring device 1 includes a first fixing member 11, a second fixing member 12, a probe 13, a resistor 14, and a data processor. The first fixing member 11 is used to set one of the probe 13 and the resistor 14 on the rotating shaft and arranged coaxially with the rotating shaft. The second fixing member 12 is used to set the other of the probe 13 and the resistor 14 on the hole wall of the rotating hole 1021 of the second swing member 102 and arranged coaxially with the rotating hole 1021. The probe 13 and the resistor 14 abut against each other. The probe 13 is electrically connected to the data processor. The resistor 14 is connected with at least three connecting lines 15 at intervals along its circumference. The at least three connecting lines 15 are electrically connected to the data processor. After the mechanical joint clearance measuring instrument 1 is installed on the mechanical joint 100, the data processor can obtain the resistance value between each connecting wire 15 and the probe 13. When there is a gap between the rotating shaft and the second swing member 102, the probe 13 and the resistance plate 14 will move relative to each other, and the resistance value between the probe 13 and each connecting wire 15 will change. The data processor calculates the position change of the contact point between the probe 13 and the circular resistance plate 14 by calculating the change in resistance value, and then determines the wear clearance value of the joint 100 between the second swing member 102 and the rotating shaft. This measuring instrument can provide a high-precision clearance value of the joint 100, and can also intuitively show the change in clearance of each part of the joint 100.

[0032] The data processor tracks the continuous changes in the contact point position between probe 13 and resistor 14, plotting a polar coordinate image with the angular position of the shaft relative to the second oscillating element 102 as the θ axis and the distance from the contact point to the axis of the shaft as the p axis. The distance p from the coordinate point to the origin represents the gap between the shaft and the second oscillating element 102 at the angular position θ at time t. With one 360° cycle as a period, the change in distance p at the same angular position during each cycle represents the change in gap, and the difference is the size of the wear gap over two cycles. The data processor transmits the results to the display screen, which shows the polar coordinate image and issues an alarm when the gap value exceeds a critical value.

[0033] Optionally, the resistor 14 is circular. In this embodiment, three connecting lines 15 are provided, and the three connecting lines 15 are arranged at a 120° angle with the center of the resistor 14. When the probe 13 is located at the center of the resistor 14, the resistance between the probe 13 and the three connecting lines 15 is the same. Therefore, setting the resistor 14 to be circular and coaxial with the rotating hole 1021 facilitates the data processor to convert the resistance signal into a position signal.

[0034] Optionally, the first fixing member 11 is an insulating stud, and the first fixing member 11 is screwed to the rotating shaft. In this embodiment, the rotating shaft is provided with a threaded hole, and the first fixing member 11 extends into the threaded hole and is fixedly connected to the rotating shaft. In other embodiments, the first fixing member 11 and the rotating shaft can also be snap-fitted or glued together. The stud is made of insulating material, which can prevent the probe 13 or resistor 14 disposed on the first fixing member 11 from being electrically connected to the rotating shaft.

[0035] Optionally, the second fixing member 12 includes a base 121 and a plurality of support legs 122. One end of the plurality of support legs 122 is spaced apart on the base 121 along the circumference of the base 121. The second fixing member 12 is disposed within the rotating hole 1021, and the other end of the plurality of support legs 122 abuts against the inner wall of the rotating hole 1021. In this embodiment, the support legs 122 abut against the inner wall of the rotating hole 1021, thereby fixing the base 121 within the rotating hole 1021. In other embodiments, the support legs 122 can be removed, and an external thread can be provided on the outer circumferential surface of the base 121, and an internal thread can be provided on the inner wall of the rotating hole 1021, thereby screwing the base 121 to the second swing member 102.

[0036] Preferably, the support leg 122 has a telescopic function. In this embodiment, the support leg 122 includes a first rod and a second rod. One end of the first rod is inserted into the base 121, and the other end of the first rod is screwed to one end of the second rod. The other end of the second rod abuts against the inner wall of the rotating hole 1021. By rotating the first rod, the length of the support leg 122 can be adjusted.

[0037] Specifically, the second fixing member 12 also includes a synchronization knob mechanism 124. The synchronization knob mechanism 124 includes a knob and a synchronization component. The synchronization component is disposed inside the base 121. The knob is rotatably disposed outside the base 121 and partially extends into the base 121 to be connected to the synchronization component. The synchronization component is also connected to the first rod of multiple support legs 122. By rotating the knob, the operator can make the synchronization component synchronously drive multiple first rods to rotate in the same direction.

[0038] Optionally, the second fixing member 12 further includes a plurality of anti-slip pads 123, which are correspondingly disposed at the other ends of the plurality of support legs 122. In this embodiment, to prevent relative sliding between the support legs 122 and the inner wall of the rotating hole 1021, anti-slip pads 123 are provided between the support legs 122 and the inner wall of the rotating hole 1021. Preferably, the anti-slip pads 123 are made of rubber.

[0039] Optionally, the probe 13 slides in cooperation with the first fixing member 11 along the axial direction of the rotating shaft, and a first elastic member is provided between the probe 13 and the first fixing member 11. The first elastic member drives the probe 13 to press the resistor sheet 14.

[0040] And / or, the resistive element 14 slides along the axial direction of the rotating shaft with the second fixing member 12, and a second elastic member is provided between the resistive element 14 and the second fixing member 12, the second elastic member driving the resistive element 14 to press the probe 13. In this embodiment, the above arrangement can ensure that the probe 13 and the resistive element 14 are always pressed together. In other embodiments, the resistive element 14 is disposed on the first fixing member 11, and the probe 13 is disposed on the second fixing member 12.

[0041] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A mechanical joint clearance measuring device for measuring the clearance of a joint (100), the joint (100) comprising a first swing member (101) and a second swing member (102), the first swing member (101) being provided with a rotating shaft, the second swing member (102) being provided with a rotating hole (1021), the rotating shaft being inserted into the rotating hole (1021) and rotatably engaging with the second swing member (102), characterized in that, The mechanical joint clearance measuring device (1) includes a first fixing member (11), a second fixing member (12), a probe (13), a resistor (14), and a data processor. The first fixing member (11) is used to set one of the probe (13) and the resistor (14) on the rotating shaft and arranged coaxially with the rotating shaft. The second fixing member (12) is used to set the other of the probe (13) and the resistor (14) on the hole wall of the rotating hole (1021) and arranged coaxially with the rotating hole (1021). The probe (13) and the resistor (14) abut against each other. The probe (13) is electrically connected to the data processor. The resistor (14) is connected with at least three connecting lines (15) at intervals along its circumference. At least three of the connecting lines (15) are electrically connected to the data processor. The first fixing member (11) is an insulating stud, and the first fixing member (11) is screwed to the rotating shaft; The resistor (14) is circular; At least three of the connecting lines (15) are connected to the resistor (14) at equal angles to the center of the resistor (14).

2. The mechanical joint clearance measuring device according to claim 1, characterized in that, The second fixing member (12) includes a base (121) and a plurality of support legs (122). One end of the plurality of support legs (122) is spaced apart on the base (121) along the circumference. The second fixing member (12) is disposed in the rotating hole (1021). The other end of the plurality of support legs (122) abuts against the inner wall of the rotating hole (1021).

3. The mechanical joint clearance measuring device according to claim 2, characterized in that, The support leg (122) has a telescopic function.

4. The mechanical joint clearance measuring device according to claim 2, characterized in that, The second fixing member (12) also includes a plurality of anti-slip pads (123), which are respectively disposed at the other end of the plurality of supporting legs (122).

5. The mechanical joint clearance measuring device according to claim 4, characterized in that, The anti-slip mat (123) is made of rubber.

6. The mechanical joint clearance measuring device according to claim 1, characterized in that, The probe (13) slides along the axis of the rotating shaft with the first fixing member (11). A first elastic member is provided between the probe (13) and the first fixing member (11). The first elastic member drives the probe (13) to press the resistor (14). And / or, the resistor (14) slides in cooperation with the second fixing member (12) along the axial direction of the rotating shaft, and a second elastic member is provided between the resistor (14) and the second fixing member (12), and the second elastic member drives the resistor (14) to press the probe (13).

7. The mechanical joint clearance measuring device according to any one of claims 1-6, characterized in that, It also includes a display screen, which is connected to the data processor.

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