A device for measuring the diameter of a part

Abstract

The present invention relates to a device for measuring the diameter of a part, comprising: a base provided with a support structure for supporting the part; two pneumatic gauges respectively used for measuring the outer diameter and the inner hole diameter. One pneumatic gauge includes an outer diameter probe, and the other pneumatic gauge includes an inner diameter probe. The outer diameter probe and the inner diameter probe are connected to the base and arranged at intervals along the axis of the inner diameter probe. The inner diameter probe can rotate relative to the base around a first axis parallel to its axis and can move axially relative to the connecting seat. When the part to be measured is placed on the support structure, it is located inside the outer diameter probe and the axis of the outer circle coincides with the first axis. The inner diameter probe can rotate around the first axis to be coaxial with the inner hole of the part to be measured located on the support structure; a part driving mechanism for connecting with the part to be measured located on the support structure and for driving the part to be measured to rotate around the first axis. The present application can simultaneously measure the outer diameter and the inner diameter of the part and can quickly complete the detection work of the part.

Description

Technical Field

[0001] The present invention relates to the field of part detection technology, and particularly relates to a device for measuring the diameter of a part. Background Art

[0002] An eccentric workpiece is a part in which the axes of the outer circle and the outer circle or the outer circle and the inner hole are parallel but do not coincide, and is widely used in various mechanical transmission devices.

[0003] For parts with parallel but non-coincident axes of the outer circle and the inner hole, after machining, it is a necessary process to detect the diameters of the outer circle and the inner hole, and judge whether each dimension is qualified to screen out unqualified products.

[0004] For the detection of the diameters of the outer circle and the inner hole of a part, it can be manually measured with a vernier caliper, or automatically measured with a pneumatic measuring instrument in cooperation with a part fixture, and the measured data is compared with the standard data to judge whether the part is qualified. Due to the non-coaxial structure of the outer circle and the inner hole of the part, the diameter measurement of the outer circle and the inner hole of the part cannot be carried out simultaneously, and the separate measurement has low efficiency. Therefore, how to simultaneously measure the diameters of the outer circle and the inner hole of a part is a technical problem that needs to be solved at present. Summary of the Invention

[0005] Based on the above description, the present invention provides a device for measuring the diameter of a part, which can simultaneously detect the diameters of the outer circle and the inner hole of the part.

[0006] The technical solution of the present invention to solve the above technical problems is as follows:

[0007] The present application provides a device for measuring the diameter of a part, and the technical solution adopted is as follows:

[0008] A device for measuring the diameter of a part, comprising:

[0009] A base, on which a support structure for supporting the part is provided;

[0010] Two pneumatic measuring instruments, respectively used for measuring the outer diameter and the inner diameter. One of the pneumatic measuring instruments includes an outer diameter probe, and the other pneumatic measuring instrument includes an inner diameter probe. The outer diameter probe and the inner diameter probe are connected to the base and are axially spaced along the axis of the inner diameter probe. The inner diameter probe can rotate relative to the base around a first axis parallel to its axis, and can move axially relative to the connecting seat. When the part to be measured is placed on the support structure, it is located inside the outer diameter probe and the axis of the outer circle coincides with the first axis. The inner diameter probe can rotate around the first axis to be coaxial with the inner hole of the part to be measured located on the support structure;

[0011] A part driving mechanism, which is used to connect with the part to be measured located on the support structure and is used to drive the part to be measured to rotate around the first axis.

[0012] Preferably, the axis of the inner diameter probe is horizontally arranged, and the supporting structure is used to support the part to be measured with a horizontal outer circle axis, and is adapted to make the part to be measured rotate by itself under the action of gravity until the inner hole axis and the outer circle axis are in the same vertical plane, and the inner hole axis is above the outer circle axis.

[0013] Preferably, a counterweight is connected to the inner diameter probe, and is adapted to make the inner diameter probe rotate around the first axis to make its axis in the same vertical plane as the first axis under the gravity of the counterweight, and the axis of the inner diameter probe is above the first axis.

[0014] Preferably, the supporting structure includes at least two support plates, the at least two support plates are arranged at intervals along the first axis direction, the plate surface of the support plate is perpendicular to the first axis, a positioning groove for the part to be measured to be inserted is provided at the top of the support plate, the positioning groove is arc-shaped and adapted to the outer circle of the part to be measured, and balls are provided on the side wall of the positioning groove.

[0015] Preferably, a frustum-shaped guiding member is coaxially sleeved outside the inner diameter probe, the diameter of the guiding member gradually increases along the direction away from the measuring end of the inner diameter probe, the guiding member moves along the first axis direction with the inner diameter probe, and can move to be partially inserted into the inner hole of the part to be measured.

[0016] Preferably, the inner diameter probe is connected to the base through a connecting structure, and the connecting structure includes:

[0017] A connecting seat, which is connected to the base and can move relative to the base along the first axis direction;

[0018] A rotating seat, which is connected to the connecting seat and can rotate relative to the connecting seat around the first axis, and the inner diameter probe is connected to the rotating seat.

[0019] Preferably, the inner diameter probe can move relative to the rotating seat along the first direction, and the first direction is perpendicular to the first axis and parallel to the plane formed by the first axis and the axis of the inner diameter probe.

[0020] Preferably, a detecting member is provided on the rotating seat, and the detecting member is used to detect the distance between it and the inner diameter probe in the first direction.

[0021] Preferably, a reference block is connected to the inner diameter probe, a reference surface is provided on the reference block, the reference surface is parallel to the first axis and perpendicular to the plane formed by the first axis and the axis of the inner diameter probe, and the detecting member is used to detect the distance between it and the reference surface in the direction perpendicular to the reference surface.

[0022] Preferably, the part driving mechanism includes a jaw and a motor. The jaw is used to clamp the part to be measured whose outer circle axis is coaxial with the first axis, and the motor is used to drive the jaw to rotate around the first axis to drive the part to be measured to rotate around the first axis.

[0023] Compared with the prior art, the technical solution of the present application has at least the following beneficial technical effects:

[0024] 1. In the present application, two pneumatic gauges are used to measure the outer diameter and inner diameter of the part respectively. The two pneumatic gauges are an outer diameter probe and an inner diameter probe respectively. The outer diameter probe and the inner diameter probe are arranged on the base and spaced along the axial direction of the inner diameter probe. When the part to be measured is placed on the support structure, it is located inside the outer diameter probe, and the part driving mechanism is used to drive the part to rotate around the outer circle axis to complete the detection of the outer diameter through the outer diameter probe. The inner diameter probe can move along the first axis direction and rotate around the first axis. When the part to be measured is on the support structure, the inner diameter probe can be rotated around the first axis until its axis is coaxial with the inner hole of the part to be measured, and then the inner diameter probe is moved along the first axis direction to insert into the inner hole to measure the inner diameter. When the part to be measured is driven by the part driving mechanism to rotate around the first axis, the inner diameter probe can rotate around the first axis with the part to be measured, so that the measurement of the outer diameter and inner diameter of the part can be carried out simultaneously, thus quickly completing the measurement of the outer diameter and inner diameter of the part, and the measurement data of the pneumatic gauge can be analyzed and processed by a computer to judge whether the part size is qualified, so as to quickly complete the detection work of the part.

[0025] 2. In the present application, the first axis is set to be horizontal, that is, the outer circle axis is horizontal when the part to be measured is placed on the support structure. Since the inner hole axis and the outer circle axis of the part to be measured do not coincide, the center of gravity of the part to be measured is biased towards the side of the outer circle axis away from the inner hole axis. When the part to be measured is placed on the support structure, it will rotate under the action of gravity until the center of gravity is below the outer circle axis, that is, the inner hole axis is above the outer circle axis, to realize the positioning of the inner hole axis. Just rotate the inner diameter probe until its axis is directly above the first axis, and the inner diameter probe can be coaxial with the inner hole, so as to quickly complete the positioning of the inner diameter probe and the inner hole, so as to insert the inner diameter probe into the inner hole for measurement. Moreover, in the present application, a counterweight is further connected to the inner diameter probe. Under the action of the gravity of the counterweight, the inner diameter probe rotates around the first axis until its axis is above the first axis. After each measurement is completed, the inner diameter probe returns to the initial position where its axis is above the first axis under the action of the gravity of the counterweight. After the part to be measured is placed on the support structure, the part to be measured also rotates under the action of gravity until the inner hole axis is above the outer circle axis, that is, the state where the inner hole axis is coaxial with the axis of the inner diameter probe, so as to quickly complete the alignment and positioning of the inner diameter probe and the inner hole, and there is no need to additionally set a driving part to rotate the inner hole probe.

[0026] 3. The support structure of the present application supports the part to be measured through at least two support plates and is provided with an arc-shaped positioning groove to quickly complete the positioning of the part. The part can be directly placed on the support plate from top to bottom, and the loading and unloading operations of the part are simple, which is convenient for setting up an automatic loading and unloading mechanism. Moreover, the setting of the balls on the inner wall of the positioning groove reduces the frictional resistance between the part to be measured and the support plate, so that the part to be measured can rotate smoothly under the action of gravity, ensuring that the positioning process of the inner hole of the part can be automatically completed.

[0027] 4. By setting a guiding member in the present application, when designing, when the inner diameter probe is inserted into the inner hole of the part to be measured, the guiding member moves with the inner diameter probe to be partially inserted into the inner hole of the part to be measured, and the side wall of the guiding member abuts against the edge of the inner hole opening of the part, so that the inner diameter probe is kept coaxial with the inner hole of the part to be measured through the guiding member, that is, a gap is maintained between the periphery of the inner diameter probe and the side wall of the inner hole of the part to be measured to ensure the accuracy of the measurement result.

[0028] 5. By setting the inner diameter probe to be movable relative to the rotating seat in the first direction in the present application, the distance between the axis of the inner diameter probe and the first axis can be adjusted according to the eccentricity of the part to be measured to meet the measurement requirements of parts with different eccentricities.

[0029] 6. By setting a detecting member in the present application, when designing, the distance between the detecting member and the first axis is set to a set value. When the guiding member moves with the inner diameter probe and is inserted into the inner hole of the part to be measured and abuts against the part to be measured, the inner diameter probe and the inner hole of the part to be measured are in a coaxial state. The eccentricity of the part to be measured can be calculated by detecting the distance between the detecting member and the inner diameter probe and the known radius data of the inner diameter probe. Therefore, the present application can also be used to detect the eccentricity of the part to be measured. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural view of the part to be measured in the embodiment of the present invention;

[0031] Figure 2 It is a schematic structural view of the part diameter measuring device provided by the embodiment of the present invention;

[0032] Figure 3 It is a schematic structural view of the support plate in the part diameter measuring device provided by the embodiment of the present invention;

[0033] Figure 4 It is a schematic view of the connection structure in the part diameter measuring device provided by the embodiment of the present invention;

[0034] Figure 5 It is a schematic view of the cooperation state of the inner diameter probe and the guiding member with the part to be measured in the part diameter measuring device provided by the embodiment of the present invention;

[0035] Figure 6Schematic diagram of another perspective of the connection structure in the part diameter measuring device provided by the embodiment of the present invention.

[0036] Explanation of reference numerals:

[0037] 1. Base; 2. Support structure; 21. Support plate; 211. Positioning groove; 212. Ball; 3. Outer diameter probe; 4. Inner diameter probe; 5. Counterweight; 6. Connection seat; 7. Rotating seat; 71. Guide groove; 8. Jaw; 9. Motor; 10. Guide; 11. Detection piece; 12. Reference block; 121. Reference surface; 13. Cylinder. Detailed implementation manners

[0038] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present application are shown in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the specification of this application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0040] It can be understood that spatial relationship terms such as "under", "below", "lower", "beneath", "above", "upper", etc. can be used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that in addition to the orientation shown in the figure, spatial relationship terms also include different orientations of the device during use and operation. For example, if the device in the drawing is flipped, the element or feature described as "under other elements" or "beneath it" or "under it" will be oriented "above" other elements or features. Therefore, the exemplary terms "under" and "below" can include both the upper and lower orientations. In addition, the device can also include other orientations (for example, rotated 90 degrees or other orientations), and the spatial description language used herein is accordingly interpreted.

[0041] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediate element. In the following embodiments, "connection", if there is an electrical signal or data transmission between the connected circuits, modules, units, etc., should be understood as "electrical connection", "communication connection", etc.

[0042] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprising", "including" or "having", etc. specify the presence of the stated features, integers, steps, operations, components, parts or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts or combinations thereof.

[0043] Referring to Figures 1-6 As shown, an embodiment of the present application provides a device for measuring the diameter of a part, which includes a base 1, two pneumatic gauges and a part driving mechanism. A support structure 2 for supporting the part is provided on the base 1. The two pneumatic gauges are respectively used to measure the outer diameter and the inner hole diameter. One pneumatic gauge includes an outer diameter probe 3, and the other pneumatic gauge includes an inner diameter probe 4. The outer diameter probe 3 and the inner diameter probe 4 are connected to the base 1 and are axially spaced along the inner diameter probe 4. The inner diameter probe 4 can rotate relative to the base 1 around a first axis parallel to its axis and can move axially relative to the connecting seat 6. When the part to be measured is placed on the support structure 2, it is located inside the outer diameter probe 3 and the axis of the outer circle coincides with the first axis. The inner diameter probe 4 can rotate around the first axis to be coaxial with the inner hole of the part to be measured located on the support structure 2. The part driving mechanism is used to connect with the part to be measured located on the support structure 2 and is used to drive the part to be measured to rotate around the first axis.

[0044] The two pneumatic gauges respectively measure the outer diameter and the inner hole diameter of the part. When the part to be measured is placed on the support structure 2, it is located inside the outer diameter probe 3, and the part is driven to rotate around the axis of the outer circle by the part driving mechanism to complete the detection of the outer diameter through the outer diameter probe 3. The inner diameter probe 4 can move along the first axis direction and rotate around the first axis. When the part to be measured is located on the support structure 2, the inner diameter probe 4 can be rotated around the first axis to make its axis coaxial with the inner hole of the part to be measured, and then the inner diameter probe 4 can be moved along the first axis direction to insert into the inner hole to measure the inner hole diameter. When the part to be measured is driven by the part driving mechanism to rotate around the first axis, the inner diameter probe 4 can rotate around the first axis with the part to be measured, so that the detection of the outer diameter and the inner diameter of the part can be carried out simultaneously, thus quickly completing the measurement of the outer diameter and the inner hole diameter of the part, and the measurement data of the pneumatic gauge can be analyzed and processed by a computer to judge whether the part size is qualified, so as to quickly complete the detection work of the part.

[0045] Referring to Figure 1As shown, the base 1 provides a support and installation foundation, which is horizontally arranged in this embodiment. In actual design, according to the length of the part to be measured and the depth of the inner hole, multiple pneumatic gauges for measuring the outer diameter can be set as required, and the corresponding multiple outer diameter probes 3 are arranged at intervals along the first axis direction. After the inner diameter probe 4 is inserted into the inner hole, it can measure a data every time it moves a set distance. The average values are taken for the measured multiple outer circle diameters and multiple inner hole diameters respectively to ensure the accuracy of the results. This embodiment is illustrated with three outer diameter probes 3 provided, and other parts of the pneumatic gauge are not shown in the figure.

[0046] Referring to Figures 1-2 As shown, in order to quickly adjust the inner diameter probe 4 and the part to be measured to the coaxial state, the axis of the inner diameter probe 4 is horizontally arranged, and the support structure 2 is used to support the part to be measured with a horizontal outer circle axis and is adapted to make the part to be measured rotate under the action of gravity until the inner hole axis and the outer circle axis are in the same vertical plane, and the inner hole axis is above the outer circle axis.

[0047] Specifically, since the inner hole axis and the outer circle axis of the part to be measured do not coincide, the center of gravity of the part to be measured is biased towards the side of the outer circle axis away from the inner hole axis. For the part to be measured with the center of gravity deviating far from the center of the outer circle, when the part to be measured is placed on the support structure 2, it will rotate under the action of gravity until the center of gravity is below the outer circle axis, that is, the inner hole axis is above the outer circle axis. Based on this, the gravity of the part to be measured can be used to make it rotate to complete the positioning of the inner hole of the part. At this time, only need to rotate the inner diameter probe 4 until its axis is directly above the first axis, then the inner diameter probe 4 can be coaxially with the inner hole, so as to quickly complete the positioning of the inner diameter probe 4 and the inner hole, so that the inner diameter probe 4 can be inserted into the inner hole for measurement.

[0048] Referring to Figures 1-2 As shown, for the support and positioning of the part to be measured by the support structure 2, the support structure 2 includes at least two support plates 21. The at least two support plates 21 are arranged at intervals along the first axis direction. The plate surface of the support plate 21 is perpendicular to the first axis. A positioning groove 211 for the part to be measured to be embedded is provided at the top of the support plate 21. The positioning groove 211 is in an arc shape adapted to the outer circle of the part to be measured. Specifically, the support plate 21 is fixed on the base 1, and the positioning groove 211 at the top can play a role in positioning the part to be measured. When the part to be measured is embedded in the positioning groove 211, the outer circle axis coincides with the first axis. In order to reduce the rotation resistance of the part to be measured, balls 212 are provided on the side wall of the positioning groove 211, and the rolling friction is formed between the part to be measured and the support plate 21, so that the part to be measured can rotate smoothly under the action of gravity.

[0049] Referring to Figure 1 and Figure 3As shown, further, after the inner hole of the part to be measured is positioned, in order to quickly complete the coaxial positioning of the inner diameter probe 4 and the inner hole, the inner diameter probe 4 is connected with a counterweight 5, which is adapted to make the inner diameter probe 4 rotate around the first axis to make the axis coplanar with the first axis in the vertical plane under the gravity of the counterweight 5, and the axis of the inner diameter probe 4 is above the first axis.

[0050] Through this setting, after each measurement is completed, the inner diameter probe 4 is reset to the initial position where the axis is above the first axis under the gravity of the counterweight 5. After the part to be measured is placed on the support structure 2, the part to be measured also rotates under the action of gravity so that the inner hole axis is above the outer circle axis, that is, the inner hole axis is coaxial with the axis of the inner diameter probe 4, achieving the purpose of quickly completing the alignment and positioning of the inner diameter probe 4 and the inner hole, and there is no need to additionally set a driving part to rotate the inner hole probe.

[0051] Refer to Figure 1 、 Figure 3 and Figure 6 As shown, specifically, the inner diameter probe 4 is connected to the base 1 through a connecting structure. The connecting structure includes a connecting seat 6 and a rotating seat 7. The connecting seat 6 is connected to the base 1 and can move relative to the base 1 along the first axis direction. The rotating seat 7 is connected to the connecting seat 6 and can rotate relative to the connecting seat 6 around the first axis. The inner diameter probe 4 is connected to the rotating seat 7. Specifically, the connecting seat 6 is installed on the base 1 through the cooperation of a guide rail and a slider so that it can move along the first axis direction. A hole for installing the rotating seat 7 is opened on the connecting seat 6. The rotating seat 7 is embedded in the hole and is rotatably connected to the connecting seat 6 through a bearing. The inner diameter probe 4 passes through the rotating seat 7. The corresponding counterweight 5 is arranged on the rotating seat 7 and is located on the opposite sides of the first axis with the inner diameter probe 4 respectively. In this embodiment, the counterweight 5 is a counterweight block, which is fixed on the rotating seat 7 through bolts.

[0052] Refer to Figure 1 As shown, the part driving mechanism is set to include a jaw 8 and a motor 9. The jaw 8 is used to clamp the part to be measured whose outer circle axis is coaxial with the first axis. The motor 9 is used to drive the jaw 8 to rotate around the first axis to drive the part to be measured to rotate around the first axis. Specifically, the motor 9 is fixed on the base 1. The jaw 8 is fixed to the output shaft of the motor 9. The jaw 8 can be an electric or pneumatic centering jaw 8, so as to clamp the part to be measured through the jaw 8 when the part is placed on the support structure 2, and drive the part to be measured to rotate through the motor 9. Further, the movement of the connecting seat 6 is driven by a cylinder 13, so as to drive the connecting seat 6 to move through the cylinder 13, insert the inner hole probe into the inner hole of the part to be measured or separate from the part to be measured, so as to realize the automatic progress of the measurement work.

[0053] Refer to Figures 4-5As shown, after the inner diameter probe 4 is inserted into the inner hole of the part to be measured, in order to keep a gap between the inner diameter probe 4 and the side wall of the inner hole of the part to be measured to improve the accuracy of the measurement result, a frustum-shaped guiding member 10 is coaxially sleeved outside the inner diameter probe 4. The diameter of the guiding member 10 gradually increases in the direction away from the measuring end of the inner diameter probe 4. The guiding member 10 moves along the first axis direction with the inner diameter probe 4 and can be moved to partially insert into the inner hole of the part to be measured.

[0054] Referring to Figure 5 As shown, specifically, the guiding member 10 is fixedly connected to the inner diameter probe 4. When designing the distance between the guiding member 10 and the measuring end of the inner diameter probe, when the inner diameter probe 4 is inserted into the inner hole of the part to be measured, the guiding member 10 moves with the inner diameter probe 4 to partially insert into the inner hole of the part to be measured, and the side wall of the guiding member 10 abuts against the edge of the inner hole of the part, so that the inner diameter probe 4 can be kept coaxial with the inner hole of the part to be measured through the guiding member 10, thereby ensuring a gap between the periphery of the inner diameter probe 4 and the side wall of the inner hole of the part to be measured to ensure the accuracy of the measurement result.

[0055] Referring to Figure 4 and Figure 6 As shown, further, the inner diameter probe 4 is arranged to be movable relative to the rotating seat 7 along the first direction. The first direction is perpendicular to the first axis and parallel to the plane formed by the first axis and the axis of the inner diameter probe 4. Specifically, a guiding groove 71 along the first direction is formed on the rotating seat 7. The inner diameter probe passes through the guiding groove 71, and the inner diameter probe is movably installed on the rotating seat 7 through the cooperation of a guide rail and a slider. Correspondingly, the guide rail is arranged on one side of the guiding groove 71 and extends along the first direction. The inner diameter probe 4 is fixed to the slider through a connecting block. In this embodiment, the guide rail and the slider are respectively arranged on both sides of the guiding groove 71 to improve the installation stability of the inner diameter probe 4. Through this setting, the distance between the axis of the inner diameter probe 4 and the first axis can be adjusted according to the eccentricity of the part to be measured to meet the measurement requirements of parts with different eccentricities.

[0056] Referring to Figure 4 and Figure 6 As shown, further, a detecting member 11 is also arranged on the rotating seat 7. The detecting member 11 is used to detect the distance between it and the inner diameter probe 4 in the first direction. Specifically, a reference block 12 is connected to the inner diameter probe 4. A reference surface 121 is provided on the reference block 12. The reference surface 121 is parallel to the first axis and perpendicular to the plane formed by the first axis and the axis of the inner diameter probe 4. The detecting member 11 is used to detect the distance between it and the reference surface 121 in the direction perpendicular to the reference surface 121. In this embodiment, both the reference block 12 and the detecting member 11 are arranged on the side of the rotating seat 7 away from the measuring end of the inner diameter probe 4. The reference block 12 is fixed to the slider on which the inner diameter probe 4 is installed. The detecting member 11 and the inner diameter probe 4 are respectively located on opposite sides of the first axis. The detecting member 11 can be a laser displacement sensor.

[0057] During design, the distance between the detecting member 11 and the first axis is set to a set value. When the guiding member 10 is inserted into the inner hole of the part to be measured along with the inner diameter measuring head 4 and abuts against the part to be measured, the inner diameter measuring head 4 and the inner hole of the part to be measured are in a coaxial state. The eccentricity of the part to be measured can be calculated by detecting the distance between the detecting member 11 and the inner diameter measuring head 4 and the known radius data of the inner diameter measuring head 4. Therefore, it can also be used to detect the eccentricity of the part to be measured. Moreover, when setting the laser displacement sensor and the counterweight member 5, according to the design requirements, the laser displacement sensor can be used to replace the counterweight member 5 to achieve the purpose of counterweight.

[0058] During actual measurement, when the guiding member 10 is inserted into the inner hole of the part along with the inner diameter measuring head 4, for the part to be measured with an eccentricity exceeding the range, due to the diameter difference between the inner diameter measuring head 4 and the inner hole to be measured, the inner diameter measuring head 4 can be smoothly inserted into the inner hole, but the axis of the part to be measured does not coincide with the axis of the inner diameter measuring head 4. At this time, during the process of the guiding member 10 being inserted into the inner hole, under the cooperation of the side wall of the guiding member 10 and the edge of the hole opening, the inner diameter measuring head 4 is displaced in the first direction, and the distance data detected by the laser displacement sensor changes greatly, so that the parts with excessive eccentricity can be screened out.

[0059] For the part to be measured with the center of gravity deviating far from the center of the outer circle, when it is on the supporting structure 2, it can automatically rotate under the action of gravity to complete the positioning of the inner hole. Cooperating with the part driving mechanism and the cylinder 13 that drives the connecting seat 6 to move, the automatic measurement of the outer diameter and the inner diameter of the part can be realized. Moreover, the measurement data can be transmitted to the computer, and the operation of each electric or pneumatic component can be controlled by the automatic control system, thereby realizing the automation of the detection work of the outer diameter and the inner diameter of the part.

[0060] For the part with the center of gravity deviating close to the center of the outer circle, when it cannot rotate automatically under the action of gravity when placed on the supporting structure 2, the inner diameter measuring head 4 and the part to be measured can be manually adjusted so that the inner diameter measuring head 4 is inserted into the inner hole for measurement, that is, the positioning work of the part to be measured and the inner diameter measuring head 4 can be carried out manually, and other operations can still be controlled by the automatic control system. Similarly, the measurement of the outer diameter and the inner diameter of the part can be carried out simultaneously, as well as the semi-automation of the detection work.

[0061] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A device for measuring the diameter of a part, characterized in that, Comprising: A base (1) provided with a support structure (2) for supporting parts; Two pneumatic gauges, respectively used for measuring the outer diameter and the inner hole diameter. One of the pneumatic gauges includes an outer diameter probe (3), and the other pneumatic gauge includes an inner diameter probe (4). The outer diameter probe (3) and the inner diameter probe (4) are connected to the base (1) and are axially spaced along the axis of the inner diameter probe (4). The inner diameter probe (4) can rotate relative to the base (1) about a first axis parallel to its axis and can move axially relative to the base (1). When the part to be measured is placed on the support structure (2), it is located inside the outer diameter probe (3) and the axis of the outer circle coincides with the first axis. The inner diameter probe (4) can rotate about the first axis to be coaxial with the inner hole of the part to be measured located on the support structure (2); A part driving mechanism, which is used to connect with the part to be measured located on the support structure (2) and is used to drive the part to be measured to rotate about the first axis; The axis of the inner diameter probe (4) is horizontally arranged. The support structure (2) is used to support the part to be measured with a horizontally arranged outer circle axis, and is adapted to make the part to be measured rotate automatically to make the inner hole axis and the outer circle axis in the same vertical plane under the action of gravity, and the inner hole axis is above the outer circle axis.

2. The part diameter measuring device according to claim 1, wherein: The inner diameter probe (4) is connected with a counterweight (5), which is adapted to make the inner diameter probe (4) rotate about the first axis to make the axis in the same vertical plane as the first axis under the gravity of the counterweight (5), and the axis of the inner diameter probe (4) is above the first axis.

3. The part diameter measuring device according to claim 1, characterized in that: The support structure (2) includes at least two support plates (21). At least two of the support plates (21) are axially spaced along the first axis. The plate surface of the support plate (21) is perpendicular to the first axis. A positioning groove (211) for the part to be measured to be inserted is provided at the top of the support plate (21). The positioning groove (211) is arc-shaped and adapted to the outer circle of the part to be measured, and balls (212) are provided on the side wall of the positioning groove (211).

4. The part diameter measuring device according to claim 1, characterized in that: A frustum-shaped guiding member (10) is coaxially sleeved outside the inner diameter probe (4). The guiding member (10) has a gradually increasing diameter along the direction away from the measuring end of the inner diameter probe (4). The guiding member (10) moves along the first axis with the inner diameter probe (4) and can move to partially insert into the inner hole of the part to be measured.

5. The part diameter measuring device according to claim 4, characterized in that, The inner diameter probe (4) is connected to the base (1) through a connection structure. The connection structure includes: a connection seat (6), which is connected to the base (1) and can move relative to the base (1) along the first axis direction; A rotating seat (7), which is connected to the connection seat (6) and can rotate relative to the connection seat (6) about the first axis. The inner diameter probe (4) is connected to the rotating seat (7).

6. The part diameter measuring device according to claim 5, characterized in that: The inner diameter probe (4) can move relative to the rotating seat (7) in a first direction. The first direction is perpendicular to the first axis and parallel to the plane formed by the first axis and the axis of the inner diameter probe (4).

7. The part diameter measuring device according to claim 6, characterized in that: A detecting member (11) is provided on the rotating seat (7). The detecting member (11) is used to detect the distance between it and the inner diameter probe (4) in the first direction.

8. The part diameter measuring device according to claim 7, wherein: A reference block (12) is connected to the inner diameter probe (4). A reference surface (121) is provided on the reference block (12). The reference surface (121) is parallel to the first axis and perpendicular to the plane formed by the first axis and the axis of the inner diameter probe (4). The detecting member (11) is used to detect the distance between it and the reference surface (121) in a direction perpendicular to the reference surface (121).

9. The part diameter measuring device according to claim 1, wherein: The part driving mechanism includes a jaw (8) and a motor (9). The jaw (8) is used to clamp a part to be measured whose outer circle axis is coaxial with the first axis. The motor (9) is used to drive the jaw (8) to rotate around the first axis so as to drive the part to be measured to rotate around the first axis.

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