Part diameter measuring device

Abstract

The invention relates to a part diameter measuring device which comprises a base which is provided with a supporting structure used for supporting a part; the two pneumatic measuring instruments are used for measuring the diameter of an outer circle and the diameter of an inner hole respectively, one pneumatic measuring instrument comprises an outer diameter measuring head, the other pneumatic measuring instrument comprises an inner diameter measuring head, the outer diameter measuring head and the inner diameter measuring head are connected to the base and are arranged at intervals in the axial direction of the inner diameter measuring head, and the inner diameter measuring head can rotate relative to the base around a first axis parallel to the axis of the inner diameter measuring head; when the measured part is arranged on the supporting structure, the measured part is located in the outer diameter measuring head, the outer circle axis of the measured part coincides with the first axis, and the inner diameter measuring head can rotate around the first axis to be coaxial with an inner hole of the measured part located on the supporting structure. The part driving mechanism is used for being connected with a tested part located on the supporting structure and used for driving the tested part to rotate around the first axis. The device can measure the outer circle diameter and the inner circle diameter of a part at the same time, and can rapidly complete the detection of the part.

Description

Technical Field

[0001] The invention relates to the field of parts detection technology, and in particular to a parts diameter measuring device. Background Art

[0002] An eccentric workpiece is a part whose outer circle and outer circle or outer circle and inner hole's axis are parallel but not coincident. It is widely used in various mechanical transmission devices.

[0003] For parts whose outer circle and inner hole axis are parallel but not overlapped, after processing is completed, it is necessary to check the diameter of the outer circle and inner hole to determine whether each dimension is qualified in order to screen out unqualified products.

[0004] The outer diameter and inner diameter of a part can be measured manually with a vernier caliper, or automatically with a pneumatic measuring instrument in conjunction with a part fixture. The measured data is compared with the standard data to determine whether the part is qualified. Due to the coaxial structure of the outer diameter and inner hole of the part, the diameter measurement of the outer diameter and inner hole of the part cannot be performed at the same time, and the efficiency of measuring them separately is low. Therefore, how to measure the diameter of the outer diameter and inner hole of the part at the same time 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 part diameter measuring device, which can simultaneously detect the diameters of the outer circle and inner hole of the part.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: The present application provides a device for measuring the diameter of a part, and the technical solution adopted is as follows: A device for measuring the diameter of a part, comprising: A base, on which a support structure for supporting the parts is provided; Two pneumatic measuring instruments, respectively used to measure 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 spaced apart along the axial direction of the inner diameter probe, the inner diameter probe can rotate relative to the base around a first axis parallel to the axis thereof, and can move relative to the connecting seat along the axial direction, when the measured part is placed on the support structure, it is located inside the outer diameter probe and the outer circle axis coincides with the first axis, and the inner diameter probe can rotate around the first axis until it is coaxial with the inner hole of the measured part located on the support structure; The part driving mechanism is used to be connected to the part to be measured located on the supporting structure, and to drive the part to be measured to rotate around the first axis.

[0007] Preferably, the inner diameter probe axis is arranged horizontally, and the support structure is used to support the measured part with a horizontal outer circle axis, and is suitable for rotating the measured part 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 located above the outer circle axis.

[0008] Preferably, the inner diameter measuring head is connected to a counterweight, which is suitable for rotating the inner diameter measuring head around the first axis through the gravity of the counterweight until the axis is co-vertical with the first axis, and the inner diameter measuring head axis is located above the first axis.

[0009] Preferably, the support structure includes at least two support plates, at least two of the support plates are spaced apart along the first axis direction, the support plate surface is perpendicular to the first axis, a positioning groove is provided on the top of the support plate for the measured part to be embedded, the positioning groove is an arc shape that matches the outer circle of the measured part, and a ball is provided on the side wall of the positioning groove.

[0010] Preferably, the outer coaxial sleeve of the inner diameter probe is provided with a truncated cone-shaped guide member, the diameter of which gradually increases in the direction away from the measuring end of the inner diameter probe, and the guide member moves along the first axis direction with the inner diameter probe and can be moved to be partially inserted into the inner hole of the measured part.

[0011] Preferably, the inner diameter probe is connected to the base via a connecting structure, and the connecting structure comprises: A connecting seat connected to the base and movable relative to the base along a first axis direction; The rotating seat is connected to the connecting seat and can rotate relative to the connecting seat around a first axis, and the inner diameter measuring head is connected to the rotating seat.

[0012] Preferably, the inner diameter measuring head can move relative to the rotating seat along a first direction, and the first direction is perpendicular to the first axis and parallel to a plane formed by the first axis and the axis of the inner diameter measuring head.

[0013] Preferably, a detection member is provided on the rotating seat, and the detection member is used to detect the distance between the detection member and the inner diameter measuring head in the first direction.

[0014] Preferably, a reference block is connected to the inner diameter probe, a reference plane is provided on the reference block, the reference plane 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 detection member is used to detect the distance between it and the reference plane in a direction perpendicular to the reference plane.

[0015] Preferably, the part driving mechanism comprises a clamp and a motor, the clamp is used to clamp the measured part whose outer axis is coaxial with the first axis, and the motor is used to drive the clamp to rotate around the first axis to drive the measured part to rotate around the first axis.

[0016] Compared with the prior art, the technical solution of the present application has at least the following beneficial technical effects: 1. The present application measures the outer diameter and inner diameter of a part respectively by two pneumatic measuring instruments. The corresponding two pneumatic measuring instruments are an outer diameter probe and an inner diameter probe respectively. The outer diameter probe and the inner diameter probe are arranged on a base and spaced apart along the axial direction of the inner diameter probe. When the measured part is placed on a supporting structure, it is located inside the outer diameter probe, and the part is driven to rotate around the outer axis by a part driving mechanism, so as to complete the detection of the outer diameter by the outer diameter probe. The inner diameter probe can be moved along the first axis and rotated around the first axis. When the measured part is located on the supporting structure, the inner diameter probe can be rotated around the first axis until the axis is coaxial with the inner hole of the measured part, and then the inner diameter probe can be moved along the first axis to be inserted into the inner hole to measure the inner hole diameter. When the measured part 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 measured part, so that the measurement of the outer diameter and the inner diameter of the part can be carried out simultaneously, thereby quickly completing the measurement of the outer diameter and the inner hole diameter of the part, and the measurement data of the pneumatic measuring instrument can be analyzed and processed by a computer to determine whether the part size is qualified, thereby quickly completing the part inspection work.

[0017] 2. The present application sets the first axis horizontally, that is, the outer circle axis is horizontal when the measured part is placed on the support structure. Since the inner hole axis and the outer circle axis of the measured part do not coincide, the center of gravity of the measured part is biased to the side of the outer circle axis away from the inner hole axis. When the measured part 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, thereby realizing the positioning of the inner hole axis. The inner diameter probe can be made coaxial with the inner hole by simply rotating the inner diameter probe until the axis is directly above the first axis, thereby quickly completing the positioning of the inner diameter probe and the inner hole, so that the inner diameter probe can be inserted into the inner hole for measurement. In addition, the present application further connects a counterweight to the inner diameter probe, and the gravity of the counterweight causes the inner diameter probe to rotate around the first axis until the axis is above the first axis. After each measurement is completed, the inner diameter probe is reset to the initial position where the axis is above the first axis under the action of the gravity of the counterweight. After the measured part is placed on the supporting structure, the measured part is also rotated under the action of gravity until the axis of the inner hole is above the axis of the outer circle, that is, the axis of the inner hole is coaxial with the axis of the inner diameter probe, thereby achieving the purpose of quickly completing the alignment and positioning of the inner diameter probe and the inner hole, and there is no need to additionally set up a driving member to rotate the inner hole probe.

[0018] 3. The support structure of the present application supports the measured part through at least two support plates, and an arc-shaped positioning groove is provided to quickly complete the positioning of the part. The part can be directly placed on the support plate from top to bottom. The loading and unloading operation of the part is simple, and it is convenient to set up an automatic loading and unloading mechanism. In addition, the setting of the ball bearing on the inner wall of the positioning groove reduces the friction resistance between the measured part and the support plate, so that the measured part can rotate smoothly under the action of gravity, ensuring that the positioning process of the inner hole of the part can be automatically completed.

[0019] 4. The present application sets a guide member. During the design, when the inner diameter probe is inserted into the inner hole of the part to be measured, the guide member moves with the inner diameter probe to partially insert into the inner hole of the part to be measured, and the side wall of the guide member abuts against the edge of the inner hole of the part, so that the inner diameter probe can be kept coaxial with the inner hole of the part to be measured through the guide member, even if a gap is maintained around the inner diameter probe and the side wall of the inner hole of the part to be measured, so as to ensure the accuracy of the measurement result.

[0020] 5. The present application sets the inner diameter probe to be movable relative to the rotating seat along the first direction, and can adjust the distance between the inner diameter probe axis and the first axis according to the eccentricity of the measured part to meet the measurement needs of parts with different eccentricities.

[0021] 6. The present application sets a detection piece and designs the distance between the detection piece and the first axis to be a set value. When the guide piece is inserted into the inner hole of the measured part along with the inner diameter probe and abuts against the measured part, the inner diameter probe and the inner hole of the measured part are in a coaxial state. The eccentricity of the measured part can be calculated by detecting the distance between the detection piece 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 measured part. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the tested part in an embodiment of the present invention; Figure 2 A schematic structural diagram of a device for measuring part diameter provided by an embodiment of the present invention; Figure 3 A schematic diagram of the structure of a support plate in a part diameter measuring device provided by an embodiment of the present invention; Figure 4 A schematic diagram of a connection structure in a part diameter measuring device provided by an embodiment of the present invention; Figure 5 A schematic diagram of the matching state between the inner diameter probe and the guide member and the measured part in the part diameter measuring device provided by an embodiment of the present invention; Figure 6 A schematic diagram of another perspective of the connection structure in the part diameter measuring device provided in an embodiment of the present invention.

[0023] Description of reference numerals: 1. Base; 2. Support structure; 21. Support plate; 211. Positioning groove; 212. Ball; 3. Outer diameter probe; 4. Inner diameter probe; 5. Counterweight; 6. Connecting seat; 7. Rotating seat; 71. Guide groove; 8. Clamp; 9. Motor; 10. Guide; 11. Detection member; 12. Reference block; 121. Reference surface; 13. Cylinder. DETAILED DESCRIPTION

[0024] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided 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, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0026] It will be appreciated that spatial relationship terms such as "under," "beneath," "below," "under," "above," "above," etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It will be appreciated that, in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0027] 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. The "connection" in the following embodiments should be understood as "electrical connection", "communication connection", etc. if the connected circuits, modules, units, etc. have electrical signals or data transmission between each other.

[0028] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include / comprise" or "have" etc. specify the presence of stated features, wholes, steps, operations, components, parts or combinations thereof, but do not exclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0029] Reference Figure 1-6 As shown, the embodiment of the present application provides a part diameter measuring device, which includes a base 1, two pneumatic measuring instruments and a part driving mechanism. The base 1 is provided with a support structure 2 for supporting the part. The two pneumatic measuring instruments are used to measure the outer diameter and the inner hole diameter respectively. Then, one pneumatic measuring instrument includes an outer diameter probe 3, and the other pneumatic measuring instrument 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 spaced apart along the axial direction of 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 relative to the connecting seat 6 along the axial direction. When the measured part is placed on the supporting structure 2, it is located inside the outer diameter probe 3 and the outer circle axis coincides with the first axis. The inner diameter probe 4 can rotate around the first axis until it is coaxial with the inner hole of the measured part located on the supporting structure 2. The part driving mechanism is used to connect with the measured part located on the supporting structure 2, and to drive the measured part to rotate around the first axis.

[0030] Two pneumatic measuring instruments measure the outer diameter and inner diameter of the part respectively. When the measured part is placed on the support structure 2, it is located in the outer diameter measuring head 3, and the part is driven to rotate around the outer axis by the part driving mechanism, so that the outer diameter is detected by the outer diameter measuring head 3. The inner diameter measuring head 4 can move along the first axis direction and rotate around the first axis. When the measured part is located on the support structure 2, the inner diameter measuring head 4 can be rotated around the first axis until the axis is coaxial with the inner hole of the measured part, and then the inner diameter measuring head 4 can be moved along the first axis direction to be inserted into the inner hole to measure the inner hole diameter. When the measured part is driven by the part driving mechanism to rotate around the first axis, the inner diameter measuring head 4 can rotate around the first axis with the measured part, so that the outer diameter and inner diameter of the part can be detected at the same time, so as to quickly complete the measurement of the outer diameter and inner diameter of the part, and the measurement data of the pneumatic measuring instrument can be analyzed and processed by a computer to determine whether the part size is qualified, so as to quickly complete the part detection work.

[0031] Reference Figure 1As shown, the base 1 provides support and installation foundation, and is horizontally arranged in this embodiment. In actual design, according to the length of the measured part and the depth of the inner hole, a plurality of pneumatic measuring instruments for measuring the outer diameter can be set, and the corresponding plurality of outer diameter probes 3 are arranged at intervals along the first axis direction, and after the inner diameter probe 4 is inserted into the inner hole, it can measure a data each time it moves a set distance, and the measured plurality of outer circle diameters and plurality of inner hole diameters are averaged to ensure the accuracy of the result. This embodiment is illustrated by providing three outer diameter probes 3, and other parts of the pneumatic measuring instrument are not shown in the figure.

[0032] Reference Figure 1-2 As shown, in order to quickly adjust the inner diameter probe 4 and the measured part to a coaxial state, the axis of the inner diameter probe 4 is set horizontally, and the support structure 2 is used to support the measured part with a horizontal outer circle axis, and is suitable for rotating the measured part 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 located above the outer circle axis.

[0033] Specifically, since the inner hole axis and the outer circle axis of the measured part do not coincide, the center of gravity of the measured part is biased toward the side of the outer circle axis away from the inner hole axis. For the measured part whose center of gravity deviates far from the center of the outer circle, when the measured part 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 measured part can be used to rotate it to complete the positioning of the inner hole of the part. At this time, it is only necessary to rotate the inner diameter probe 4 until the axis is directly above the first axis, so that the inner diameter probe 4 can be coaxial with the inner hole, thereby quickly completing 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.

[0034] Reference Figure 1-2 As shown, in order to support and position the measured part through the support structure 2, the support structure 2 includes at least two support plates 21, at least two support plates 21 are arranged at intervals along the first axis direction, the support plate 21 surface is perpendicular to the first axis, and the top of the support plate 21 is provided with a positioning groove 211 for the measured part to be embedded, and the positioning groove 211 is in an arc shape that matches the outer circle of the measured part. Specifically, the support plate 21 is fixed on the base 1, and the positioning groove 211 on the top can play a role in positioning the measured part, so that when the measured part 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 measured part, a ball 212 is provided on the side wall of the positioning groove 211, and the measured part and the support plate 21 become rolling friction, so that the measured part can smoothly rotate under the action of gravity.

[0035] Reference Figure 1 and Figure 3As shown, further, after the positioning of the inner hole of the measured part is achieved, 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 to a counterweight 5, which is suitable for rotating the inner diameter probe 4 around the first axis through the gravity of the counterweight 5 until the axis is in the same vertical plane as the first axis, and the axis of the inner diameter probe 4 is located above the first axis.

[0036] With this arrangement, 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 action of gravity of the counterweight 5. After the measured part is placed on the support structure 2, the measured part is also rotated under the action of gravity until 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, thereby 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 up a driving member to rotate the inner hole probe.

[0037] Reference 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, and 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, and 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 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 provided on the connecting seat 6, and the rotating seat 7 is embedded in the hole and rotatably connected to the connecting seat 6 through a bearing, and the inner diameter probe 4 passes through the rotating seat 7, and the corresponding counterweight 5 is arranged on the rotating seat 7 and is located on opposite sides of the first axis with the inner diameter probe 4. In this embodiment, the counterweight 5 is a counterweight block, which is fixed to the rotating seat 7 by bolts.

[0038] Reference Figure 1 As shown, the part driving mechanism is configured to include a clamp 8 and a motor 9. The clamp 8 is used to clamp the measured part whose outer cylindrical axis is coaxial with the first axis. The motor 9 is used to drive the clamp 8 to rotate around the first axis to drive the measured part to rotate around the first axis. Specifically, the motor 9 is fixed on the base 1, and the clamp 8 is fixed to the output shaft of the motor 9. The clamp 8 can be electrically or pneumatically centered. When the part is placed on the support structure 2, the clamp 8 clamps the measured part, and the motor 9 drives the measured part to rotate. Furthermore, the movement of the connecting seat 6 is driven by the cylinder 13, so that the connecting seat 6 is driven to move by the cylinder 13, and the inner hole probe is inserted into the inner hole of the measured part or separated from the measured part, so that the measurement work can be automatically performed.

[0039] Reference Figure 4-5As shown, after the inner diameter probe 4 is inserted into the inner hole of the measured part, in order to maintain a distance between the inner diameter probe 4 and the side wall of the inner hole of the measured part to improve the accuracy of the measurement result, a truncated cone-shaped guide member 10 is coaxially sleeved outside the inner diameter probe 4. The diameter of the guide member 10 gradually increases in the direction away from the measuring end of the inner diameter probe 4. The guide member 10 moves along the first axis direction with the inner diameter probe 4 and can be moved to be partially inserted into the inner hole of the measured part.

[0040] Reference Figure 5 As shown, specifically, the guide 10 is fixedly connected to the inner diameter probe 4. When designing the distance between the guide 10 and the measuring end of the inner diameter side head, when the inner diameter probe 4 is inserted into the inner hole of the measured part, the guide 10 moves with the inner diameter probe 4 to partially insert into the inner hole of the measured part, and the side wall of the guide 10 is abutted 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 measured part through the guide 10, so that a gap can be maintained between the inner diameter probe 4 and the side wall of the inner hole of the measured part to ensure the accuracy of the measurement result.

[0041] Reference Figure 4 and Figure 6 As shown, further, the inner diameter probe 4 is configured to be movable relative to the rotating seat 7 along a 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 4. Specifically, a guide groove 71 along the first direction is provided on the rotating seat 7, and the inner diameter side head passes through the guide groove 71, and the inner diameter side head 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 guide groove 71 and extends along the first direction, and 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 guide groove 71 to improve the installation stability of the inner diameter probe 4. Through this arrangement, the distance between the axis of the inner diameter probe 4 and the first axis can be adjusted according to the eccentricity of the measured part to meet the measurement needs of parts with different eccentricities.

[0042] Reference Figure 4 and Figure 6 As shown, further, a detection member 11 is also provided on the rotating seat 7, and the detection 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, and a reference plane 121 is provided on the reference block 12. The reference plane 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 detection member 11 is used to detect the distance between it and the reference plane 121 in a direction perpendicular to the reference plane 121. In this embodiment, the reference block 12 and the detection member 11 are both 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 on the slider installed on the inner diameter probe 4, the detection member 11 and the inner diameter probe 4 are respectively located on opposite sides of the first axis, and the detection member 11 can adopt a laser displacement sensor.

[0043] When designing, the distance between the detection member 11 and the first axis is set to a set value. When the guide member 10 is inserted into the inner hole of the measured part along with the inner diameter probe 4 and abuts against the measured part, the inner diameter probe 4 and the inner hole of the measured part are in a coaxial state. The distance between the detection member 11 and the inner diameter probe 4 and the known radius data of the inner diameter probe 4 can be used to calculate the eccentricity of the measured part. Therefore, it can also be used to detect the eccentricity of the measured part. In addition, when setting the laser displacement sensor and the counterweight 5, the laser displacement sensor can be used to replace the counterweight 5 to achieve the purpose of counterweighting according to design requirements.

[0044] During actual measurement, when the guide 10 is inserted into the inner hole of the part along with the inner diameter probe 4, for the measured part with eccentricity exceeding the range, due to the diameter difference between the inner diameter probe 4 and the measured inner hole, the inner diameter probe 4 can be smoothly inserted into the inner hole, but the axis of the measured part does not coincide with the axis of the inner diameter probe 4. At this time, when the guide 10 is inserted into the inner hole, the inner diameter probe 4 is displaced in the first direction under the cooperation of the side wall of the guide 10 and the edge of the hole, and the distance data detected by the laser displacement sensor changes significantly, thereby screening out parts with excessive eccentricity.

[0045] For the measured parts whose center of gravity deviates far from the center of the outer circle, they can automatically rotate under the action of gravity to complete the positioning of the inner hole when on the support structure 2, and cooperate with the part driving mechanism and the cylinder 13 that drives the connection seat 6 to move, so as to realize the automation of the measurement of the outer diameter and inner diameter of the part. In addition, 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 of the outer diameter and inner diameter of the part.

[0046] For parts whose center of gravity deviates closer to the center of the outer circle and are placed on the support structure 2 and cannot rotate under the action of gravity, the inner diameter probe 4 and the part to be measured can be manually adjusted so that the inner diameter probe 4 can be inserted into the inner hole for measurement. That is, the positioning of the part to be measured and the inner diameter probe 4 can be performed manually, and other operations can still be controlled by the automatic control system. It is also possible to simultaneously measure the outer diameter and inner diameter of the part, as well as semi-automatically perform the detection work.

[0047] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for measuring the diameter of a part, characterized in that: include: A base (1) on which a support structure (2) for supporting parts is provided; Two pneumatic measuring instruments, respectively used to measure the outer diameter and the inner diameter, one of the pneumatic measuring instruments comprises an outer diameter measuring head (3), and the other pneumatic measuring instrument comprises an inner diameter measuring head (4), the outer diameter measuring head (3) and the inner diameter measuring head (4) are connected to the base (1) and are spaced apart along the axial direction of the inner diameter measuring head (4), the inner diameter measuring head (4) can rotate relative to the base (1) around a first axis parallel to the axis thereof, and can move relative to the connecting seat (6) along the axial direction, when the measured part is placed on the support structure (2), it is located inside the outer diameter measuring head (3) and the outer circle axis coincides with the first axis, and the inner diameter measuring head (4) can rotate around the first axis until it is coaxial with the inner hole of the measured part located on the support structure (2); A part driving mechanism is used to connect with the part to be measured located on the support structure (2) and to drive the part to be measured to rotate around a first axis.

2. The part diameter measuring device according to claim 1, characterized in that: The axis of the inner diameter measuring head (4) is arranged horizontally, and the support structure (2) is used to support the measured part with a horizontal outer circle axis, and is suitable for rotating the measured part 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 located above the outer circle axis.

3. The part diameter measuring device according to claim 2, characterized in that: The inner diameter measuring head (4) is connected to a counterweight (5), which is suitable for rotating the inner diameter measuring head (4) around a first axis through the gravity of the counterweight (5) until the axis is co-vertical with the first axis, and the axis of the inner diameter measuring head (4) is located above the first axis.

4. The part diameter measuring device according to claim 2, characterized in that: The support structure (2) comprises at least two support plates (21), at least two of the support plates (21) are arranged at intervals along the direction of the first axis, the plate surface of the support plate (21) is perpendicular to the first axis, a positioning groove (211) is provided on the top of the support plate (21) for the measured part to be embedded, the positioning groove (211) is in an arc shape adapted to the outer circle of the measured part, and a ball (212) is provided on the side wall of the positioning groove (211).

5. The part diameter measuring device according to claim 1, characterized in that: A truncated cone-shaped guide member (10) is coaxially sleeved outside the inner diameter probe (4), and the diameter of the guide member (10) gradually increases in a direction away from the measuring end of the inner diameter probe (4). The guide member (10) moves along the first axis with the inner diameter probe (4) and can be moved to be partially inserted into the inner hole of the measured part.

6. The part diameter measuring device according to claim 5, characterized in that: The inner diameter measuring head (4) is connected to the base (1) via a connecting structure, and the connecting structure comprises: A connecting seat (6) connected to the base (1) and movable relative to the base (1) along a first axis direction; A rotating seat (7) is connected to the connecting seat (6) and can rotate relative to the connecting seat (6) around a first axis, and the inner diameter measuring head (4) is connected to the rotating seat (7).

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

8. The part diameter measuring device according to claim 7, characterized in that: The rotating seat (7) is provided with a detection member (11), and the detection member (11) is used to detect the distance between the detection member and the inner diameter measuring head (4) in a first direction.

9. The part diameter measuring device according to claim 8, characterized in that: The inner diameter measuring head (4) is connected to a reference block (12), the reference block (12) is provided with a reference surface (121), the reference surface (121) is parallel to the first axis and perpendicular to a plane formed by the first axis and the axis of the inner diameter measuring head (4), and the detection member (11) is used to detect the distance between the detection member (11) and the reference surface (121) in a direction perpendicular to the reference surface (121).

10. The part diameter measuring device according to claim 1, characterized in that: The part driving mechanism comprises a clamp (8) and a motor (9), wherein the clamp (8) is used to clamp a part to be measured whose outer cylindrical axis is coaxial with a first axis, and the motor (9) is used to drive the clamp (8) to rotate around the first axis to drive the part to be measured to rotate around the first axis.

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