Part length detection device and detection method

Abstract

The invention relates to a part length detection device and method. The device comprises a base; a length sensor; the supporting piece and the length sensor are arranged at an interval in the first direction; the supporting structure is located between the length sensor and the supporting piece and used for supporting a measured part with the axis parallel to the first direction, and the measured part is located on the supporting structure and can move in the axial direction; the reference piece is located between the length sensor and the supporting piece; the measuring assembly is used for measuring the distance between the reference part and the base in the first direction; the length sensor and the reference piece can move relative to the base in the first direction, the reference piece can move to be in contact with the step face of a measured part located on the supporting structure, the length sensor moves close to the supporting piece to drive the part to move, and the part drives the reference piece in contact with the step face to move close to the supporting piece. According to the invention, the total length of the part and the length measurement of each section with different diameters can be completed at one time, so that the length detection work of the part is rapidly completed, and the detection efficiency is improved.

Description

Technical Field

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

[0002] Shaft parts are widely used in various mechanical transmission structures. The accuracy of shaft parts directly affects their assembly accuracy and the stability of power transmission. Therefore, after the shaft parts are processed, their various dimensional data need to be tested.

[0003] Some shaft parts have two sections with different diameters, with a step surface formed between the two sections. Each section is designed to cooperate with different counterparts. To ensure the matching accuracy of each section with the corresponding counterpart, it is necessary to ensure that the length of each section is within the design range. Therefore, after the processing of such parts is completed, the length of each section needs to be tested to screen out unqualified products.

[0004] At present, for the above-mentioned shaft parts with two sections of different diameters, the length of each section is usually detected manually using a vernier caliper, and the detection efficiency is low. Therefore, it is necessary to design a part length detection device to quickly complete the length detection of each section of the part. Summary of the invention

[0005] Based on the above description, the present invention provides a part length detection device and detection method, which can quickly complete the length detection of each section of the part.

[0006] The technical solution of the present invention to solve the above technical problems is as follows: In the first aspect, the present application provides a part length detection device, and the technical solution adopted is as follows: A part length detection device, comprising: Base; A length sensor connected to the base; A support member connected to the base and spaced apart from the length sensor in a first direction, the first direction being parallel to a telescopic movement direction of the detection head of the length sensor, the support member being used to support the measured part in an axial direction; A support structure, which is disposed on the base and located between the length sensor and the support member, the support structure is used to support a measured part whose axis is parallel to the first direction, and the measured part can move axially when located on the support structure; A reference member connected to the base and located between the length sensor and the support member; A measuring component, used for measuring the distance between the reference member and the base in a first direction; Among them, the length sensor and the reference part can be moved relative to the base along a first direction, and the reference part can be moved to contact the step surface of the measured part located on the support structure, and is suitable for driving the part to move by moving the length sensor close to the support part, and driving the reference part in contact with the step surface to move close to the support part through the part.

[0007] Preferably, the reference part includes a reference position and a starting position spaced apart in a first direction, the reference position being close to the support member, and when one end of the standard part is located on the support structure and abuts against the support member, the step surface contacts the reference part located at the reference position, and a reset drive member is provided on the base for driving the reference part to move to the starting position.

[0008] Preferably, the measuring assembly includes a measuring piece and a detecting piece. The measuring piece can move relative to the base along a first direction. The measuring piece is connected to the reference piece via a transmission structure. When the reference piece moves along the first direction, the measuring piece is driven to move along the first direction via the transmission structure. The detecting piece is connected to the supporting piece, and is used to measure the distance between the detecting piece and the measuring piece.

[0009] Preferably, the distance that the reference member moves relative to the base is smaller than the distance that the measuring member is driven to move by the transmission structure.

[0010] Preferably, the transmission structure comprises: An active rack connected to the reference member and having a length direction parallel to the first direction; A driven rack connected to the measuring member and having a length direction parallel to the first direction; A driving gear, which is rotatably connected to the base and meshes with the driving rack; The driven gear is coaxially fixed with the driving gear and meshes with the driven rack, and the diameter of the driven gear is greater than the diameter of the driving gear.

[0011] Preferably, the detection member comprises a laser displacement sensor, a reference plane perpendicular to the first direction is provided on the measuring member, and the laser displacement sensor is used to detect the distance between the laser displacement sensor and the reference plane in the first direction.

[0012] Preferably, a transmission rod is provided between the length sensor and the supporting structure, the axis of the transmission rod is parallel to the first direction, the transmission rod can move relative to the base and relative to the length sensor along the first direction, the transmission rod can move to one end to contact the probe of the length sensor, and can move to contact one end of the measured part located on the supporting structure, the resistance of the transmission rod to movement relative to the length sensor along the first direction is greater than the resistance of the measured part to move axially on the supporting structure, and when the length sensor moves close to the support, the measured part is driven to move close to the support by the transmission rod.

[0013] Preferably, the length sensor and the transmission rod are connected to the base via a connecting seat, the connecting seat can move relative to the base in a first direction, the length sensor is fixed on the connecting seat, the transmission rod can move relative to the connecting seat in a first direction, an elastic member is provided between the transmission rod and the connecting seat, and the transmission rod overcomes the elastic force of the elastic member when it moves relative to the connecting seat and approaches the length sensor.

[0014] In a second aspect, the present application provides a method for detecting the length of a part, which uses the part length detection device as described above to perform detection.

[0015] Compared with the prior art, the technical solution of the present application has at least the following beneficial technical effects: 1. This application measures the overall length of the measured part by cooperating with the length sensor and the support, and measures the length of the smaller diameter section of the part by cooperating with the reference part and the measuring assembly; in actual design, the detection head of the length sensor is directed toward the support, and the part is placed on the moving path of the length sensor when it is placed on the support structure. During measurement, the part is placed on the support structure, and a gap is kept between the part and the support, and at the same time, the reference part is moved to contact the step surface of the part; the length sensor moves close to the support to set the stroke, the length sensor moves until the detection head contacts the measured part and continues to move to drive the part close to the support, and the design is such that the part contacts the support when the length sensor does not reach the set stroke; when the length sensor reaches the set stroke, the part moves the detection head, so that the length sensor generates a reading, and the length of the measured part can be calculated based on the set distance between the length sensor and the support when the length sensor reaches the set stroke position and does not generate a reading, as well as the reading of the length sensor, and the length of the measured part can be calculated, and compared with the standard data to determine whether the total length of the part is qualified. When the part is driven by the length sensor to move close to the support, the part drives the reference part to move close to the support through the step surface. When the length sensor moves to the maximum stroke position, the part contacts the support and the step surface contacts the reference part. The distance between the reference part and the support is measured by the measuring component, and according to the set thickness data of the reference part, the distance from the step surface of the part to the support can be calculated, that is, the length of the smaller diameter section of the part. Then, the length of the larger diameter section of the part is calculated according to the measured total length of the part, and the measurement of each section of the length of the part is completed. After that, it is compared with the corresponding standard value to determine whether the length of each section and the total length of the part are qualified, so as to complete the length detection of the part. Therefore, the present application can complete the length measurement of each section of the total length and diameter of the part at one time, so as to quickly complete the length detection of the part and improve the detection efficiency.

[0016] 2. This application sets a reset drive member. Before each measurement, the reset drive member drives the reference member to move to the starting position. When the reference member is in contact with the step surface of the measured part at the starting position, the measured part and the support member are spaced apart. In this way, when the part moves close to the support member, it will first move to the step surface to contact the reference member, and maintain the contact state to drive the reference member to move close to the support member, even if the reference member remains in contact with the step surface of the measured part, so as to accurately calculate the length of the smaller diameter section of the part according to the thickness data of the reference member and the measured distance data with the support member. The reset drive member can use an electric or pneumatic drive device to achieve automatic control.

[0017] 3. The present application sets the measuring component to include a measuring piece and a detection piece. When the reference piece moves, the measuring piece is moved by the transmission structure, the movement of the reference piece is converted into the movement of the measuring piece, and the distance between the reference piece and the support is calculated by measuring the distance between the support and the measuring piece. The position of the measuring piece can be more selective, so as to facilitate the setting of the detection component. At the same time, the distance that the reference piece moves relative to the base is set to be less than the distance that the measuring piece is driven to move by the transmission structure, that is, the distance between the position of the reference piece and the reference position when the part contacts the support is enlarged and converted into the distance between the measured position of the measuring piece and the position of the measuring piece when the reference piece is in the reference position, so that the measurement data of the detection piece is larger, so as to reduce the influence of small errors in the measurement data and improve the measurement accuracy. The thickness of the reference piece, the distance between the position of the measuring piece and the support when the reference piece is in the reference position, the distance between the reference piece and the support when the reference piece is in the reference position, and the magnification of the transmission structure are all set values, and the length of the smaller diameter section of the part can be calculated. Furthermore, the detection part is designed as a laser displacement sensor, and its detection data can be transmitted to the control system. At the same time, the detection data of the length sensor can also be transmitted to the control system. The data processing module in the control system can process the data and output the length data of each section of the part and the full length data, and judge whether the length of each section is qualified, so as to realize automatic detection of the part length.

[0018] 4. The present application sets a transmission rod, which replaces the length sensor and contacts the measured part. During measurement, the transmission rod first contacts the measured part to drive the measured part to move. Since the resistance of the transmission rod to the movement of the length sensor is greater than the movement resistance of the measured part, before the measured part moves to contact with the support, the transmission rod and the length sensor do not have relative displacement, which will not change the measured data of the length sensor, ensuring that the part moves to contact with the support. After the measured part moves to contact with the support, the transmission rod continues to move and moves relative to the length sensor to change the length sensor data, thereby ensuring that the data measured by the length sensor is the data when the part contacts the support, so as to improve the accuracy of the measurement data. And through the setting of the elastic member, after each measurement is completed, when the length sensor is reset to the initial position, the transmission rod can be reset to the initial position under the elastic force of the elastic member, even if the length sensor is vertically reset to zero, so as to carry out the detection of the next part, the whole process can be completed automatically, which is convenient for realizing the automation of the detection work. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a part length detection device provided by an embodiment of the present invention; Figure 2 A schematic top view of a part length detection device provided by an embodiment of the present invention; Figure 3A schematic diagram of a transmission structure in a part length detection device provided in an embodiment of the present invention.

[0020] Description of reference numerals: 1. Base; 2. Length sensor; 3. Support member; 31. Support surface; 4. Support structure; 41. Support plate; 411. Positioning groove; 5. Reference member; 6. Measuring component; 61. Measuring member; 611. Reference surface; 62. Detection member; 7. Connecting seat; 71. Mounting plate; 8. Slider; 9. Guide rail; 10. Reset drive member; 20. Transmission structure; 201. Active rack; 202. Driven rack; 203. Active gear; 204. Driven gear; 30. Transmission rod; 301. Limit block; 40. Elastic member; 50. Driving cylinder. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] Reference Figure 1-3 As shown, the embodiment of the present application provides a part length detection device, including a base 1 and a length sensor 2 connected to the base 1, a support 3, a support structure 4, a reference part 5 and a measuring assembly 6, the support 3 and the length sensor 2 are spaced apart in a first direction, the first direction is parallel to the telescopic movement direction of the detection head of the length sensor 2, the support 3 is used to support the measured part in the axial direction, the support structure 4 is located between the length sensor 2 and the support 3, and is used to support the measured part whose axis is parallel to the first direction, and the measured part can move axially when it is located on the support structure 4, the reference part 5 is located between the length sensor 2 and the support 3, and the measuring assembly 6 is used to measure the distance between the reference part 5 and the base 1 in the first direction. Among them, the length sensor 2 and the reference part 5 can move relative to the base 1 along the first direction, the reference part 5 can move to contact with the step surface of the measured part located on the support structure 4, and is suitable for driving the part to move by moving the length sensor 2 close to the support 3, and driving the reference part 5 in contact with the step surface to move close to the support 3 through the part.

[0027] Reference Figure 1-2 As shown, during the design, the detection head of the length sensor 2 is directed toward the support 3, and the part is placed on the support structure 4 so as to be located on the moving path of the length sensor 2. During measurement, the part is placed on the support structure 4, and a gap is kept between the part and the support 3. At the same time, the reference part 5 is moved to contact the step surface of the part. The length sensor 2 moves from the starting position close to the support 3 to the set stroke. The length sensor 2 moves until the detection head contacts the measured part and continues to move to drive the part close to the support 3. During the design, the part contacts the support 3 before the length sensor 2 reaches the set stroke. When the length sensor 2 reaches the set stroke, the part moves the detection head, so that the length sensor 2 generates a reading. According to the set distance between the length sensor 2 and the support 3 when the length sensor 2 reaches the set stroke position and does not generate a reading, and the reading of the length sensor 2, the length of the measured part can be calculated, and compared with the standard data, it can be judged whether the total length of the part is qualified.

[0028] When the part is driven by the length sensor 2 to move close to the support 3, the part drives the reference part 5 to move close to the support 3 through the step surface. When the length sensor 2 moves to the maximum stroke position, the part contacts the support 3 and the step surface contacts the reference part 5. The distance between the reference part 5 and the support 3 is measured by the measuring component 6, and according to the set thickness data of the reference part 5, the distance from the step surface of the part to the support 3, that is, the length of the smaller diameter section of the part can be calculated, and then the length of the larger diameter section of the part is calculated according to the measured total length of the part, and the measurement of each section of the length of the part is completed. After that, it is compared with the corresponding standard value to determine whether the length of each section and the total length of the part are qualified, so as to complete the length detection of the part. Therefore, the length measurement of each section of the total length and diameter of the part can be completed at one time, so as to quickly complete the length detection of the part and improve the detection efficiency.

[0029] Reference Figure 1-2 As shown, the base 1 provides a supporting foundation. In this embodiment, the base 1 is horizontally arranged and the first direction is the horizontal direction for illustration and description.

[0030] Reference Figure 1-2 As shown, specifically, the length sensor 2 is connected to the base 1 through the connecting seat 7, and the connecting seat 7 can move relative to the base 1 along the first direction. The connecting seat 7 is movably mounted on the base 1 through the cooperation of the slider 8 and the guide rail 9. The connecting seat 7 is provided with a mounting plate 71 perpendicular to the first direction, and the length sensor 2 passes through the mounting plate 71 and is fixed on the mounting plate 71. A driving cylinder 50 is provided on the base 1 to drive the connecting seat 7 to move along the first direction, so as to drive the length sensor 2 to move along the first direction through the cylinder, thereby realizing automatic control of the movement of the length sensor 2 and accurately controlling the moving stroke of the length sensor 2.

[0031] Reference Figure 1-2 As shown, in order to support and position the parts conveniently and quickly, the support structure 4 includes two support plates 41 perpendicular to the first direction, the two support plates 41 are spaced apart along the first direction, and arc-shaped positioning grooves 411 adapted to the two sections of the parts are respectively provided on the tops of the two support plates 41, so that when the parts are embedded in the positioning grooves 411, the axis is parallel to the first direction, and is restricted to move horizontally in the radial direction, and the section with a smaller diameter of the parts faces the support member 3. Through this arrangement, the parts can be quickly positioned, and the parts can be stably supported, and the parts can be placed on the two support plates 41 or removed in the vertical direction, and the loading and unloading operations of the parts are simple and convenient, and easy to realize automation.

[0032] Reference Figure 1-2As shown, the support member 3 is fixed on the base 1. Specifically, the support member 3 is block-shaped and includes a support surface 31 perpendicular to the first direction. The support surface 31 faces the length sensor 2. The part can be moved to one end to abut against the support surface 31 to stably support the measured part through the support member 3.

[0033] Reference Figure 1-2 As shown, in order to ensure that the reference part 5 contacts the step surface of the part when the part moves to contact the support 3, the reference part 5 includes a reference position and a starting position spaced apart in the first direction, the reference position is close to the support 3, and when one end of the standard part is located on the support structure 4 and abuts against the support 3, the step surface contacts the reference part 5 located at the reference position, and a reset driving member 10 for driving the reference part 5 to move to the starting position is provided on the base 1. Before each part is inspected, the reference part 5 is driven to move to the starting position by the reset driving member 10, and then the part is placed on the support structure 4, and the interval between the part and the support 3 is maintained. When the part moves close to the support 3, it will first move to the step surface to contact the reference part 5, and maintain the contact state to drive the reference part 5 to move close to the support 3. Even when the part contacts the support 3, the reference part 5 maintains a state of contact with the step surface of the measured part, so as to accurately calculate the length of the smaller diameter section of the part according to the thickness data of the reference part 5 and the measured distance data from the support 3.

[0034] Reference Figure 1-2 As shown, specifically, the reference member 5 is in the shape of a sheet perpendicular to the first direction, and both sides thereof in the first direction are planes perpendicular to the first direction. The thickness of the reference member 5 is designed as required, and the reference member 5 is also movably mounted on the base 1 through the cooperation of the guide rail 9 and the slider 8. The reset drive member 10 can be an electric or pneumatic drive device such as a cylinder or a linear motor to achieve automatic control. In this embodiment, a cylinder is used as an example, and the cylinder is located between the reference member 5 and the support member 3, and the cylinder piston rod does not need to be fixed to the reference member 5. The reference member 5 is moved to the air chamber position by extending the cylinder piston rod.

[0035] Reference Figure 1-2As shown, further, the measuring component 6 includes a measuring piece 61 and a detection piece 62. The measuring piece 61 can move relative to the base 1 along the first direction. The measuring piece 61 is connected to the reference piece 5 through the transmission structure 20. When the reference piece 5 moves along the first direction, the measuring piece 61 is driven to move along the first direction through the transmission structure 20. The detection piece 62 is connected to the support 3, and the detection piece 62 is used to measure the distance between it and the measuring piece 61. Specifically, the measuring piece 61 is also movably installed on the base 1 through the cooperation of the guide rail 9 and the slider 8, and the measuring piece 61 and the reference piece 5 are spaced apart in a direction perpendicular to the first direction. The movement of the reference piece 5 is converted into the movement of the measuring piece 61, and the distance between the reference piece 5 and the support 3 is calculated by measuring the distance between the support 3 and the measuring piece 61. The position of the measuring piece 61 can be more selective, so as to facilitate the setting of the detection component.

[0036] Reference Figure 2-3 As shown, in order to improve the accuracy of the measurement results of the length of the smaller diameter section of the part, the distance that the reference part 5 moves relative to the base 1 is set to be smaller than the distance that the measuring part 61 is driven to move by the transmission structure 20, that is, the distance between the position of the reference part 5 and the reference position when the part contacts the support part 3 is amplified and converted into the distance between the actual measured position of the measuring part 61 and the position of the measuring part 61 when the reference part 5 is in the reference position. At this time, the measurement data of the detection part 62 is larger, so as to reduce the influence of small errors in the measurement data and improve the measurement accuracy. During design, the thickness of the reference part 5, the distance between the position of the measuring part 61 and the support part 3 when the reference part 5 is in the reference position, the distance between the reference part 5 and the support part 3 when the reference part 5 is in the reference position, and the magnification factor of the transmission structure 20 are all set values. During specific calculation, the distance between the actual position of the measuring part 61 and the position of the measuring part 61 when the reference part 5 is in the reference position can be calculated based on the data detected by the detection part 62 and the distance between the position of the measuring part 61 and the support part 3 when the reference part 5 is in the reference position. Then, according to the magnification factor of the transmission structure 20, the distance between the actual position of the reference part 5 and the reference position is calculated. Then, according to the distance between the reference part 5 and the support part 3 when the reference part 5 is in the reference position and the thickness of the reference part 5, the distance from the step surface of the part to the support surface 31 of the support part 3, that is, the length of the smaller diameter section of the part, can be calculated.

[0037] Reference Figure 2-3As shown, the transmission structure 20 includes an active rack 201, a driven rack 202, an active gear 203 and a driven gear 204. The active rack 201 is connected to the reference member 5 and its length direction is parallel to the first direction. The driven rack 202 is connected to the measuring member 61 and its length direction is parallel to the first direction. The active gear 203 is rotatably connected to the base 1 and meshes with the active rack 201. The driven gear 204 is coaxially fixed with the active gear 203 and meshes with the driven rack 202, and the diameter of the driven gear 204 is larger than the diameter of the active gear 203. Specifically, the active gear 203 and the driven gear 204 are coaxially fixed on a vertical mounting shaft, the mounting shaft is rotatably mounted on the base 1, the active gear 203 and the driven gear 204 are distributed up and down, the active rack 201 is fixed on the slider 8 mounted on the reference member 5, and the driven rack 202 is mounted on the slider 8 mounted on the measuring member 61.

[0038] Reference Figure 1 As shown, further, the detection member 62 includes a laser displacement sensor, and a reference plane 611 perpendicular to the first direction is provided on the measuring member 61, and the laser displacement sensor is used to detect the distance between the measuring member 61 and the reference plane 611 in the first direction. Specifically, the laser displacement sensor is fixed on the support member 3, and a side surface of the measuring member 61 close to the support member 3 is the reference plane 611, and the measuring member 61 is located on the detection optical path of the laser displacement sensor, so as to measure the distance between the reference plane 611 and the support member 3 through the laser displacement sensor.

[0039] Furthermore, in order to realize automatic control of the entire detection process, the length sensor 2, the laser displacement sensor, the drive cylinder 50 and the cylinder of the reset drive member 10 are all connected to the control system. The control system controls the operation of each component and receives the detection data of the length sensor 2 and the laser displacement sensor. The data processing module in the control system processes the data and outputs the length data of each section of the part and the total length data, and determines whether the part is qualified according to the preset standard value.

[0040] Reference Figure 1-2 As shown, further, a transmission rod 30 is provided between the length sensor 2 and the support structure 4, and the axis of the transmission rod 30 is parallel to the first direction. The transmission rod 30 can move relative to the base 1 along the first direction and can move relative to the length sensor 2. The transmission rod 30 can move to one end to contact the probe of the length sensor 2, and can move to contact one end of the measured part located on the support structure 4. The resistance of the transmission rod 30 to the movement of the length sensor 2 along the first direction is greater than the resistance of the measured part to the axial movement on the support structure 4. When the length sensor 2 moves close to the support 3, the measured part is driven to move close to the support 3 by the transmission rod 30.

[0041] With this arrangement, the transmission rod 30 contacts the measured part instead of the length sensor 2. During measurement, the transmission rod 30 first contacts the measured part to drive the measured part to move. Since the resistance of the transmission rod 30 to the movement of the length sensor 2 is greater than the resistance to the movement of the measured part, before the measured part moves to contact the support 3, there is no relative displacement between the transmission rod 30 and the length sensor 2, and the measurement data of the length sensor 2 will not change, thereby ensuring that the part moves to contact the support 3. After the measured part moves to contact the support 3, the transmission rod 30 continues to move and moves relative to the length sensor 2 to change the data of the length sensor 2, thereby ensuring that the data measured by the length sensor 2 is the data when the part is in contact with the support 3, so as to improve the accuracy of the measurement data.

[0042] In this embodiment, a mounting plate 71 for mounting the transmission rod 30 is further provided on the connecting seat 7, and the two mounting plates 71 are spaced apart along the first direction. The transmission rod 30 is mounted on the mounting plate 71 close to the support member 3 and is coaxially arranged with the length sensor 2. The transmission rod 30 passes through the mounting plate 71 and can move relative to the mounting plate 71 along the first direction.

[0043] Reference Figure 1-2 As shown, an elastic member 40 is provided between the transmission rod 30 and the connection seat 7, and the transmission rod 30 overcomes the elastic force of the elastic member 40 when it moves relative to the connection seat 7 and close to the length sensor 2. By setting the elastic member 40, the movement resistance of the transmission rod 30 can be made greater than the movement resistance of the measured part, and after each measurement is completed, when the length sensor 2 is reset to the initial position, the transmission rod 30 can be reset to the initial position under the elastic force of the elastic member 40, even if the length sensor 2 is vertically reset to zero, so as to carry out the detection work of the next part, the whole process can be completed automatically, which is convenient for realizing the automation of the detection work.

[0044] Reference Figure 1-2 As shown, specifically, the elastic member 40 is a spring, and a limit block 301 is coaxially sleeved outside one end of the transmission rod 30 close to the length sensor 2. The limit block 301 is fixed to the transmission rod 30, and the spring is coaxially sleeved outside the length sensor 2 and the transmission rod 30, and the two ends of the spring are respectively abutted against the mounting plate 71 where the length sensor 2 is located and the limit block 301.

[0045] When testing in this embodiment, the connecting seat 7 is first driven to reset to the starting position by the driving cylinder 50, and the reference member 5 is driven to move to the initial position by the resetting driving member 10; the parts are prevented from being placed on the two support plates 41. After the parts are in place, the control system controls the driving cylinder 50 to operate, driving the connecting seat 7 to move the set stroke close to the support member 3 to reach the end position; the data processing module of the control system processes the detection data of the length sensor 2 and the laser displacement sensor, and calculates the length data and total length data of each section of the part, and determines whether the part is qualified; after completion, the driving cylinder 50 runs in the reverse direction, driving the connecting seat 7 to reset to the starting position, and the resetting driving member 10 drives the reference member 5 to move to the initial position; and the next part is tested. The entire testing process can be carried out automatically, and with the automatic feeding device, the automatic testing of batch parts can be realized.

[0046] This embodiment also provides a method for detecting the length of a part, which uses the part length detection device as described above to perform detection.

[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 part length detection device, characterized in that: include: Base (1); A length sensor (2) connected to the base (1); A support member (3) connected to the base (1) and spaced apart from the length sensor (2) in a first direction, the first direction being parallel to the telescopic movement direction of the detection head of the length sensor (2), the support member (3) being used to support the measured part in the axial direction; A support structure (4) is arranged on the base (1) and located between the length sensor (2) and the support member (3), the support structure (4) being used to support a measured part whose axis is parallel to the first direction, and the measured part can move axially when located on the support structure (4); A reference member (5) connected to the base (1) and located between the length sensor (2) and the support member (3); A measuring component (6) for measuring the distance between the reference member (5) and the base (1) in a first direction; The length sensor (2) and the reference member (5) are movable relative to the base (1) along a first direction, and the reference member (5) is movable until it contacts a step surface of a part to be measured located on the support structure (4), and is suitable for driving the part to move by moving the length sensor (2) close to the support member (3), and driving the reference member (5) in contact with the step surface to move close to the support member (3) through the part.

2. The part length detection device according to claim 1, characterized in that: The reference part (5) comprises a reference position and a starting position which are spaced apart in a first direction, the reference position being close to the support part (3), and when one end of the standard part is located on the support structure (4) and abuts against the support part (3), the step surface contacts the reference part (5) located at the reference position, and a reset driving part (10) for driving the reference part (5) to move to the starting position is provided on the base (1).

3. The part length detection device according to claim 1, characterized in that: The measuring assembly (6) comprises a measuring member (61) and a detecting member (62); the measuring member (61) is movable relative to the base (1) along a first direction; the measuring member (61) is connected to the reference member (5) via a transmission structure (20); when the reference member (5) moves along the first direction, the measuring member (61) is driven by the transmission structure (20) to move along the first direction; the detecting member (62) is connected to the supporting member (3); and the detecting member (62) is used to measure the distance between the detecting member (62) and the measuring member (61).

4. The part length detection device according to claim 3 is characterized in that: The distance that the reference member (5) moves relative to the base (1) is smaller than the distance that the measuring member (61) is driven to move by the transmission structure (20).

5. The part length detection device according to claim 4, characterized in that: The transmission structure (20) comprises: An active rack (201), which is connected to the reference member (5) and has a length direction parallel to the first direction; A driven rack (202), which is connected to the measuring member (61) and has a length direction parallel to the first direction; A driving gear (203) rotatably connected to the base (1) and meshing with the driving rack (201); A driven gear (204) is coaxially fixed with the driving gear (203) and meshes with the driven rack (202), and the diameter of the driven gear (204) is greater than the diameter of the driving gear (203).

6. The part length detection device according to claim 3, characterized in that: The detection member (62) comprises a laser displacement sensor, the measuring member (61) is provided with a reference plane (611) perpendicular to the first direction, and the laser displacement sensor is used to detect the distance between the laser displacement sensor and the reference plane (611) in the first direction.

7. The part length detection device according to claim 1, characterized in that: A transmission rod (30) is provided between the length sensor (2) and the support structure (4); the axis of the transmission rod (30) is parallel to the first direction; the transmission rod (30) can move relative to the base (1) and relative to the length sensor (2) along the first direction; the transmission rod (30) can move until one end contacts the probe of the length sensor (2) and can move until one end contacts the measured part located on the support structure (4); the resistance to the movement of the transmission rod (30) relative to the length sensor (2) along the first direction is greater than the resistance to the measured part moving axially on the support structure (4); when the length sensor (2) moves close to the support member (3), the measured part is driven to move close to the support member (3) by the transmission rod (30).

8. The part length detection device according to claim 7, characterized in that: The length sensor (2) and the transmission rod (30) are connected to the base (1) via a connecting seat (7); the connecting seat (7) can move relative to the base (1) along a first direction; the length sensor (2) is fixed to the connecting seat (7); the transmission rod (30) can move relative to the connecting seat (7) along a first direction; an elastic member (40) is provided between the transmission rod (30) and the connecting seat (7); when the transmission rod (30) moves relative to the connecting seat (7) and approaches the length sensor (2), the elastic force of the elastic member (40) is overcome.

9. A method for detecting the length of a part, characterized in that: The detection is performed using a part length detection device as described in any one of claims 1 to 8.

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