Wire diameter measuring device

Abstract

The invention relates to the technical field of aeronautical manufacturing, and particularly discloses a wire diameter measuring device which is characterized in that a V-shaped groove positioning wire harness is formed in a shell, the axis of a belt wheel is located over the axis of the wire harness, the back side of a synchronous belt spirally surrounds and clings to the periphery of the wire harness, one end of the synchronous belt is fixedly connected with the shell, and the other end of the synchronous belt is fixedly connected with the shell. When the back side of the synchronous belt surrounds and is tightly attached to the periphery of the wire harness, the synchronous belt drives the belt wheel to rotate in the first direction, and the measuring assembly is used for measuring the rotation angle of the belt wheel. The synchronous belt drives the belt wheel to rotate in the process of surrounding and clinging to the wire harness, the measuring assembly measures the rotation angle of the belt wheel so as to calculate the arc length of the initial matching point of the belt wheel and the synchronous belt in the process, the peripheral length of the wire harness is obtained through further calculation of known values, and the diameter of the wire harness is obtained. The synchronous belt can be tightly attached to the periphery of the wire harness and is not easy to deform, so that the accuracy of a measurement result is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of aviation manufacturing, and particularly to a wire diameter measuring device. Background Art

[0002] In the field of aviation manufacturing, in order to select the correct type of wire harness fixing and protecting device, it is necessary to measure the wire diameter of the wire harness before wire harness assembly. Traditional measurement methods include using a caliper or a tape measure, but due to the poor roundness of the wire harness, the wire diameter data obtained by using a caliper is inaccurate. Therefore, a tape measure is often used to measure the circumferential length of the wire harness, and then the wire diameter is equivalently obtained by calculation. However, the tape measure is also at risk of deformation with the extension of use time, resulting in inaccurate measurement results. Summary of the Invention

[0003] The purpose of the present invention is to provide a wire diameter measuring device to solve the problem of inaccurate measurement results existing in the existing measurement means.

[0004] The present invention provides a wire diameter measuring device, which includes a housing, a synchronous pulley assembly, a synchronous belt, and a measuring assembly. The housing is formed with a V-shaped groove for positioning the wire harness. The synchronous pulley assembly includes a pulley and a wheel shaft, the pulley and the wheel shaft are fixedly connected, the wheel shaft is rotatably connected to the housing, and the axis of the pulley is located directly above the axis of the wire harness. The back side of the synchronous belt can be spirally wound around and tightly attached to the outer periphery of the wire harness. One end of the synchronous belt is fixedly connected to the housing, and the tooth side of the other end of the synchronous belt can cooperate with the pulley and drive the pulley to rotate. The synchronous belt is configured such that when the back side of the synchronous belt is wound around and tightly attached to the outer periphery of the wire harness, the synchronous belt drives the pulley to rotate in a first direction. The measuring assembly is coaxially arranged with the pulley and is used for measuring the rotation angle of the pulley.

[0005] As a preferred technical solution of the wire diameter measuring device, the width of the pulley is greater than the width of the synchronous belt.

[0006] As a preferred technical solution of the wire diameter measuring device, it further includes a damping assembly. The damping assembly is connected to the synchronous pulley assembly and can increase the damping during the rotation of the pulley in the first direction.

[0007] As a preferred technical solution of the wire diameter measuring device, the damping assembly includes a ratchet wheel, a ratchet pawl, and a tension spring. The ratchet wheel is coaxially arranged with the pulley and is fixedly connected to the wheel shaft. The ratchet pawl is hinged to the housing and meshes with the ratchet wheel. The ratchet pawl enables the ratchet wheel to rotate only in the first direction. The two ends of the tension spring are respectively connected to the housing and the ratchet pawl, and the tension spring is used to make the ratchet pawl mesh with the ratchet wheel.

[0008] As a preferred technical solution of the wire diameter measuring device, the damping assembly further includes a release screw. The release screw is threadedly connected to the housing, can contact the ratchet pawl, and can make the ratchet pawl disengage from the ratchet wheel.

[0009] As a preferred technical solution of the wire diameter measuring device, the pawl is hinged to the housing through a hinge shaft, and the tension spring and the release screw are respectively located on both sides of the hinge shaft.

[0010] As a preferred technical solution of the wire diameter measuring device, a damping piece is fixedly connected to the pawl, and the damping piece is used to increase the damping at the meshing position of the pawl and the ratchet wheel.

[0011] As a preferred technical solution of the wire diameter measuring device, it further includes a processor assembly and a display. The processor assembly is communicatively connected to the measuring assembly, the processor assembly and the display are communicatively connected. The measuring assembly can send the rotation angle signal of the pulley to the processor assembly. The processor assembly can calculate the diameter of the wire harness according to the rotation angle signal of the pulley, and send the diameter information of the wire harness to the display, and the display is used to display the diameter information of the wire harness.

[0012] As a preferred technical solution of the wire diameter measuring device, the measuring assembly includes an optical encoder disk and an encoder. The optical encoder disk is coaxially arranged with the pulley, the optical encoder disk is fixedly connected to the wheel shaft, the encoder is fixedly connected to the housing, the encoder is arranged at the edge of the optical encoder disk, and the encoder is communicatively connected to the processor assembly. The encoder is used to obtain the rotation angle signal of the optical encoder disk and send it to the processor assembly.

[0013] As a preferred technical solution of the wire diameter measuring device, let:

[0014] The total length of the synchronous belt is L;

[0015] The length from the end of the synchronous belt fixed to the housing to the bottom end of the V-shaped groove is L1;

[0016] The circumference of the pulley is L2, and the rotation angle of the pulley is r;

[0017] The diameter of the wire harness is D; <sinθ>

[0018]

[0019] The beneficial effects of the present invention are:

[0020] The present invention provides a wire diameter measuring device. The wire harness is positioned through the V-shaped groove on the housing. During the process that the synchronous belt surrounds and clings to the wire harness, the pulley is driven to rotate, and the rotation angle of the pulley is measured by the measuring assembly, so as to calculate the arc length passed by the point where the pulley and the synchronous belt are initially matched during this process. Since one end of the synchronous belt is fixedly connected to the housing, that is, the distance from the end of the synchronous belt fixedly connected to the housing to the point where the pulley and the synchronous belt are initially matched remains unchanged. Therefore, the outer circumference length of the wire harness can be calculated through the total length of the synchronous belt, and then the wire harness diameter can be calculated. Since the synchronous belt can cling to the outer circumference of the wire harness and the synchronous belt is not easily deformed, the accuracy of the measurement result is guaranteed. Brief Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of the wire diameter measuring device in the embodiment of the present invention;

[0022] Figure 2 It is a rear view of the wire diameter measuring device in the embodiment of the present invention;

[0023] Figure 3 is Figure 2 a sectional view taken along the A-A direction in

[0024] Figure 4 It is a side view of the wire diameter measuring device in the embodiment of the present invention;

[0025] Figure 5 is Figure 4 a sectional view taken along the B-B direction in

[0026] Figure 6 It is one of the schematic structural diagrams of the wire diameter measuring device in the embodiment of the present invention with the wire harness hidden;

[0027] Figure 7 It is another schematic structural diagram of the wire diameter measuring device in the embodiment of the present invention with the wire harness hidden;

[0028] Figure 8 It is a rear view of the wire diameter measuring device in the embodiment of the present invention with the wire harness and the controller assembly hidden.

[0029] In the figure:

[0030] 100, wire harness; 1, housing; 11, V-shaped groove; 2, synchronous belt; 21, fixing screw; 3, pulley; 31, wheel shaft; 32, bearing; 4, measuring assembly; 41, optical encoder disc; 42, encoder; 5, damping assembly; 51, ratchet; 52, pawl; 53, tension spring; 54, release screw; 6, controller assembly; 7, power supply; 8, button; 9, display. Detailed Embodiments

[0031] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0033] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "mounted", "connected" and "coupled" shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention may be understood according to specific circumstances.

[0034] The embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0035] As Figures 1 - 8As shown in the figure, the present invention provides a wire diameter measuring device, which includes a housing 1, a synchronous pulley assembly, a synchronous belt 2, and a measuring assembly 4. The housing 1 is formed with a V-shaped groove 11, and the V-shaped groove 11 is used to position the wire harness 100. The synchronous pulley assembly includes a pulley 3 and a shaft 31. The pulley 3 and the shaft 31 are fixedly connected, and the shaft 31 is rotatably connected to the housing 1 through a bearing 32. The axis of the pulley 3 is located directly above the axis of the wire harness 100. The back side of the synchronous belt 2 can be spirally wound around and closely attached to the outer periphery of the wire harness 100. One end of the synchronous belt 2 is fixedly connected to the housing 1, and the tooth side of the other end of the synchronous belt 2 can cooperate with the pulley 3 and drive the pulley 3 to rotate. The synchronous belt 2 is configured such that when the back side of the synchronous belt 2 is wound around and closely attached to the outer periphery of the wire harness 100, the synchronous belt 2 drives the pulley 3 to rotate in the first direction. The measuring assembly 4 is coaxially arranged with the pulley 3, and the measuring assembly 4 is used to measure the rotation angle of the pulley 3. The axis of the pulley 3 is located directly above the axis of the wire harness 100, and the wire harness 100 is positioned by the V-shaped groove 11 of the housing 1. Thus, both the point where the synchronous belt 2 and the wire harness 100 first come into contact and the point where the synchronous belt 2 and the pulley 3 engage are located directly above the axis of the wire harness 100. That is, after the synchronous belt 2 winds around the outer periphery of the wire harness 100 for one circle, it exactly forms a closed circle. Then the length of this section of the synchronous belt 2 is the circumference of the wire harness 100. By positioning the wire harness 100 through the V-shaped groove 11 on the housing 1, during the process of the synchronous belt 2 winding around and closely attaching to the wire harness 100, the pulley 3 is driven to rotate, and the rotation angle of the pulley 3 is measured by the measuring assembly 4. Thus, the arc length traveled by the point where the pulley 3 and the synchronous belt 2 are initially engaged is calculated. Since one end of the synchronous belt 2 is fixedly connected to the housing 1, that is, the distance between the end of the synchronous belt 2 fixedly connected to the housing 1 and the point where the pulley 3 and the synchronous belt 2 are initially engaged remains unchanged. Therefore, the outer circumference length of the wire harness 100 can be calculated from the total length of the synchronous belt 2, and then the diameter of the wire harness 100 can be calculated. Since the synchronous belt 2 can be closely attached to the outer periphery of the wire harness 100 and the synchronous belt 2 is not easily deformed, the accuracy of the measurement result is ensured.

[0036] Specifically, when measuring the diameter of the wire harness 100, one end of the synchronous belt 2 is connected to the housing 1 through a fixing screw 21. After the synchronous belt 2 is wound around the wire harness 100 for one week, the tooth side of the other end of the synchronous belt 2 cooperates with the pulley 3 and can drive the pulley 3 to rotate. The synchronous belt 2 is preferably a toothed belt, and its tooth side meshes with the synchronous pulley. During the process of the synchronous belt 2 winding around and closely attaching to the wire harness 100, the arc length traveled by the point where the pulley 3 and the synchronous belt 2 are initially engaged is the length of the synchronous belt 2 that has meshed with the pulley 3. Please refer to Figures 6 - 8As shown, the housing 1 is provided with a V-shaped groove 11 for positioning the wire harness 100, so that the point where the wire harness 100 is initially engaged with the toothed belt is located at the bottom end of the V-shaped groove 11. Therefore, let the total length of the timing belt 2 be L; let the length from the fixed end of the timing belt 2 to the housing 1 to the bottom end of the V-shaped groove 11 be L1; let the circumference of the pulley 3 be L2, and the rotation angle of the pulley 3 be r, that is, during the process that the timing belt 2 surrounds and clings to the wire harness 100, the arc length passed by the point where the pulley 3 is initially engaged with the timing belt 2 is L2×r / 360; through calculation, the circumference of the wire harness 100 can be obtained as L - L1 - L2×r / 360; let the diameter of the wire harness 100 be D, then D = (L - L1 - L2×r / 360) / π.

[0037] It can be understood that the timing belt 2 spirally surrounds the wire harness 100 along the outer circumference of the wire harness 100 to avoid interference. The spiral angle is subject to the actual engineering situation and will not be specifically limited here. In this embodiment, the timing belt 2 only surrounds the outer circumference of the wire harness 100 once and the spiral angle is small, so it will not affect the measurement result.

[0038] Furthermore, since the timing belt 2 spirally surrounds the wire harness 100 along the outer circumference of the wire harness 100, in order to avoid interference between the outer side wall of the timing belt 2 and the inner side wall of the pulley 3 during the engagement of the timing belt 2 and the pulley 3, the width of the pulley 3 is set to be greater than the width of the timing belt 2 to ensure that neither side of the timing belt 2 will interfere with or rub against the two inner side walls of the pulley 3, resulting in wear of the timing belt 2.

[0039] Even further, the wire diameter measuring device further includes a damping assembly 5. The damping assembly 5 is connected to the synchronous pulley assembly. The damping assembly 5 can increase the damping during the rotation of the pulley 3 in the first direction. Thus, during the process of measuring the diameter of the wire harness 100, the rotation speed of the pulley 3 is relatively slow, avoiding an increase in error caused by the impact of the rapid rotation of the pulley 3 and ensuring the accuracy of the test result.

[0040] Specifically, as Figure 5 and Figure 8As shown, the damping assembly 5 includes a ratchet wheel 51, a pawl 52, a tension spring 53, and a release screw 54. The ratchet wheel 51 is coaxially arranged with the belt pulley 3 and the ratchet wheel 51 is fixedly connected to the wheel shaft 31. The pawl 52 is hinged to the housing 1, the pawl 52 meshes with the ratchet wheel 51, and the pawl 52 enables the ratchet wheel 51 to rotate only in the first direction. The two ends of the tension spring 53 are respectively connected to the housing 1 and the pawl 52. The tension spring 53 is always in a stretched state, and the tension spring 53 is used to make the pawl 52 mesh with the ratchet wheel 51. While the belt pulley 3 rotates in the first direction, the ratchet wheel 51 is driven by the wheel shaft 31 to rotate in the first direction. During this process, relative friction occurs between the teeth of the pawl 52 and the ratchet wheel 51, thereby increasing the damping during the rotation of the belt pulley 3 in the first direction and also preventing the belt pulley 3 from rotating in the reverse direction. The release screw 54 is threadedly connected to the housing 1, and the release screw 54 can contact the pawl 52 and disengage the pawl 52 from the ratchet wheel 51. Please refer to Figure 5 and Figure 8 As shown, the pawl 52 is hinged to the housing 1 through a hinge shaft, and the tension spring 53 and the release screw 54 are respectively located on both sides of the hinge shaft. When the release screw 54 is screwed into the housing 1 until it contacts the pawl 52, and then the release screw 54 is further screwed in, the pawl 52 rotates relative to the housing 1, the tension spring 53 is stretched, and the pawl 52 disengages from the teeth of the ratchet wheel 51. At this time, the belt pulley 3 can rotate in the direction opposite to the first direction, that is, the synchronous belt 2 can drive the belt pulley 3 to rotate in the direction opposite to the first direction, so that the wire diameter measuring device can be separated from the wire harness 100.

[0041] Optionally, a damping piece (not shown in the figure) is fixedly connected to the pawl 52. The damping piece is arranged on the side where the pawl 52 meshes with the ratchet wheel 51 and is used to increase the damping at the meshing position of the pawl 52 and the ratchet wheel 51, thereby further increasing the damping during the rotation of the belt pulley 3 in the first direction.

[0042] It should be noted that in other embodiments, the release screw 54 may not be provided. Correspondingly, the ratchet wheel 51 and the pawl 52 always remain meshed. When the diameter of the wire harness 100 is measured, the fixing screw 21 connecting the synchronous belt 2 and the housing 1 can be unscrewed, and the other end of the synchronous belt 2 can be continuously pulled to drive the belt pulley 3 to continue rotating in the first direction until the entire synchronous belt 2 is no longer meshed with the belt pulley 3, and the wire diameter measuring device can also be separated from the wire harness 100.

[0043] Furthermore, as shown in Figure 2 、 Figure 3 、 Figure 7 and Figure 8As shown in the figure, the wire diameter measuring device further includes a power supply 7, a processor assembly, and a display 9. The power supply 7 is electrically connected to the display 9 and the processor assembly, and the power supply 7 is used to supply electrical energy to the display 9 and the processor assembly. The processor assembly is communicatively connected to the measuring assembly 4. The measuring assembly 4 can measure the rotation angle of the pulley 3 and send the rotation angle signal of the pulley 3 to the processor assembly. The processor assembly can calculate the diameter of the wire harness 100 based on the rotation angle signal of the pulley 3. The calculation method has been described in detail above, so it will not be elaborated here. The processor assembly is communicatively connected to the display 9 and can send the information of the diameter of the wire harness 100 to the display 9. The display 9 is used to display the diameter information of the wire harness 100. The processor assembly can be a single-chip microcomputer or an integration of multiple single-chip microcomputers, which can run relevant programs and store information. Its structure and principle will not be elaborated as they are prior art in this field. Inside the processor assembly, the selection criteria for wire harness fixing and protecting devices such as wire clamps or wire holders, such as a selection table, are also stored. The selection information of the wire harness fixing and protecting device is provided based on the calculated diameter of the wire harness 100 and the selection criteria, and is displayed on the display 9.

[0044] Optionally, a plurality of buttons 8 are further provided on the housing 1, and the plurality of buttons 8 are all communicatively connected to the processor assembly. By pressing different buttons 8, the display content can be switched on the display 9, such as the circumference of the wire harness 100, the diameter of the wire harness 100, or the selection information, etc. Those skilled in the art can set the number of buttons 8 and the display content corresponding to different buttons 8 as needed.

[0045] Specifically, the measuring assembly 4 includes an optical encoder disk 41 and an encoder 42. The optical encoder disk 41 is coaxially arranged with the pulley 3 and the optical encoder disk 41 is fixedly connected to the wheel axle 31. The encoder 42 is fixedly connected to the housing 1 and the encoder 42 is arranged at the edge of the optical encoder disk 41. The structures of the optical encoder disk 41 and the encoder 42 will not be elaborated as they are prior art in this field. The encoder 42 is communicatively connected to the processor assembly, and the encoder 42 is used to obtain the rotation angle signal of the optical encoder disk 41 and send it to the processor assembly. When the pulley 3 rotates, the optical encoder disk 41 is driven to rotate at the same angular velocity through the wheel axle 31. Thus, the rotation angle of the optical encoder disk 41 obtained by the encoder 42 is the rotation angle of the pulley 3.

[0046] When measuring the diameter of the wire harness 100 using the wire diameter measuring device of this embodiment, first unscrew the release screw 54 so that the pawl 52 meshes with the teeth of the ratchet wheel 51 under the elastic force of the tension spring 53, enabling the ratchet wheel 51 to rotate only in the first direction. One end of the synchronous belt 2 is connected to the housing 1 through the fixing screw 21, and the wire harness 100 is placed in the V-shaped groove 11 for positioning. The back side of the synchronous belt 2 faces the wire harness 100 and spirally surrounds the outer periphery of the wire harness 100, and the tooth side of the other end of the synchronous belt 2 meshes with the pulley 3. Pull the other end of the synchronous belt 2 to make the back side of the synchronous belt 2 tightly attached to the outer periphery of the wire harness 100. During this process, the tooth side of the synchronous belt 2 drives the pulley 3 to rotate in the first direction, and the pulley 3 drives the ratchet wheel 51 and the optical encoder disc 41 to rotate synchronously through the wheel shaft 31. During the rotation of the ratchet wheel 51, there is always friction between the pawl 52 and the teeth of the ratchet wheel 51 under the elastic force of the tension spring 53, thereby increasing the damping during the rotation of the pulley 3. When the back side of the synchronous belt 2 is tightly attached to the outer periphery of the wire harness 100, the pulley 3 stops rotating. At this time, the encoder 42 obtains the rotation angle of the optical encoder disc 41 during this process and sends the rotation angle signal to the processor assembly. The processor assembly calculates the diameter of the wire harness 100 and matches the corresponding selection information to the display 9 for display. After the test, screw in the release screw 54 so that the end of the release screw 54 contacts the pawl 52 and drives the pawl 52 to disengage from the ratchet wheel 51. At this time, the pawl 52 can rotate in the direction opposite to the first direction, that is, the pulley 3 can rotate in the direction opposite to the first direction. At this time, the other end of the synchronous belt 2 can be pushed in the reverse direction to remove the wire diameter measuring device from the wire harness 100. In other embodiments, for the case where the release screw 54 is not provided, after the test, unscrew the fixing screw 21 at one end of the synchronous belt 2, continue to pull the other end of the synchronous belt 2, and the pulley 3 continues to rotate in the first direction until the entire synchronous belt 2 disengages from the pulley 3, that is, the synchronous belt 2 disengages from the wire harness 100, and the wire diameter measuring device can also be removed from the wire harness 100.

[0047] 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 manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation manners here. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A wire diameter measuring device, characterized in that, Comprising: A housing (1), the housing (1) is formed with a V-shaped groove (11), and the V-shaped groove (11) is used to position a wire harness (100); A synchronous pulley assembly, including a belt pulley (3) and a pulley shaft (31), the belt pulley (3) and the pulley shaft (31) are fixedly connected, the pulley shaft (31) is rotatably connected to the housing (1), and the axis of the belt pulley (3) is located directly above the axis of the wire harness (100); A synchronous belt (2), the back side of the synchronous belt (2) can be spirally wound around and closely attached to the outer periphery of the wire harness (100), one end of the synchronous belt (2) is fixedly connected to the housing (1), and the tooth side of the other end of the synchronous belt (2) can cooperate with the belt pulley (3) to drive the belt pulley (3) to rotate; the synchronous belt (2) is configured such that when the back side of the synchronous belt (2) is wound around and closely attached to the outer periphery of the wire harness (100), the synchronous belt (2) drives the belt pulley (3) to rotate in a first direction; A measuring assembly (4), the measuring assembly (4) is coaxially arranged with the belt pulley (3), and the measuring assembly (4) is used to measure the rotation angle of the belt pulley (3).

2. The wire diameter measuring device according to claim 1, characterized in that The width of the belt pulley (3) is greater than the width of the synchronous belt (2).

3. The wire diameter measuring device according to claim 1, wherein It further includes a damping assembly (5), the damping assembly (5) is connected to the synchronous pulley assembly, and the damping assembly (5) can increase the damping during the rotation of the belt pulley (3) in the first direction.

4. The wire diameter measuring device according to claim 3, characterized in that, The damping assembly (5) includes a ratchet wheel (51), a ratchet pawl (52) and a tension spring (53), the ratchet wheel (51) is coaxially arranged with the belt pulley (3), the ratchet wheel (51) is fixedly connected to the pulley shaft (31), the ratchet pawl (52) is hinged to the housing (1), the ratchet pawl (52) meshes with the ratchet wheel (51), the ratchet pawl (52) enables the ratchet wheel (51) to only rotate in the first direction, and the two ends of the tension spring (53) are respectively connected to the housing (1) and the ratchet pawl (52), and the tension spring (53) is used to make the ratchet pawl (52) mesh with the ratchet wheel (51).

5. The wire diameter measuring device according to claim 4, characterized in that, The damping assembly (5) further includes a release screw (54), the release screw (54) is threadedly connected to the housing (1), the release screw (54) can contact the ratchet pawl (52), and the release screw (54) can make the ratchet pawl (52) disengage from the ratchet wheel (51).

6. The wire diameter measuring device according to claim 5, characterized in that The ratchet pawl (52) is hinged to the housing (1) through a hinge shaft, and the tension spring (53) and the release screw (54) are respectively located on both sides of the hinge shaft.

7. The wire diameter measuring device according to claim 4, characterized in that, A damping piece is fixedly connected to the ratchet pawl (52), and the damping piece is used to increase the damping at the meshing position of the ratchet pawl (52) and the ratchet wheel (51).

8. The wire diameter measuring device according to any one of claims 1-7, characterized in that, It further includes a processor assembly and a display (9). The processor assembly is communicatively connected to the measurement component (4), and the processor assembly is communicatively connected to the display (9). The measurement component (4) can send the rotation angle signal of the pulley (3) to the processor assembly. The processor assembly can calculate the diameter of the wire harness (100) according to the rotation angle signal of the pulley (3), and send the diameter information of the wire harness (100) to the display (9). The display (9) is used to display the diameter information of the wire harness (100).

9. The wire diameter measuring device according to claim 8, characterized in that, The measurement component (4) includes an optical encoder disk (41) and an encoder (42). The optical encoder disk (41) is coaxially arranged with the pulley (3), and the optical encoder disk (41) is fixedly connected to the wheel axle (31). The encoder (42) is fixedly connected to the housing (1). The encoder (42) is arranged at the edge of the optical encoder disk (41), and the encoder (42) is communicatively connected to the processor assembly. The encoder (42) is used to obtain the rotation angle signal of the optical encoder disk (41) and send it to the processor assembly.

10. The wire diameter measuring device according to claim 8, wherein: The total length of the synchronous belt (2) is L; The length from the end where the synchronous belt (2) is fixed to the housing (1) to the bottom end of the V-shaped groove (11) is L1; The circumference of the pulley (3) is L2, and the rotation angle of the pulley (3) is r; The diameter of the wire harness (100) is D; Then D = (L - L1 - L2×r / 360) / π.

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