A device and method for detecting the length of a part

Abstract

The present invention relates to a part length detection device and a detection method. The device includes: a base; a length sensor; a support member spaced from the length sensor in a first direction; a support structure located between the length sensor and the support member for supporting a part to be measured with an axis parallel to the first direction, and the part to be measured is axially movable on the support structure; a reference member located between the length sensor and the support member; a measurement assembly for measuring the distance between the reference member and the base in the first direction; the length sensor and the reference member are movable relative to the base in the first direction, and the reference member can be moved into contact with the step surface of the part to be measured located on the support structure, and is adapted to drive the part to move by moving the length sensor closer to the support member, and drive the reference member in contact with the step surface to move closer to the support member by the part. The present application can complete the length measurement of each section with different total lengths and diameters of the part at one time, thereby quickly completing the length detection work of the part and improving the detection efficiency.

Description

Technical Field

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

[0002] Shaft parts are widely used in various mechanical transmission structures. The precision of shaft parts directly affects their assembly precision and the stability of power transmission. Therefore, after the shaft parts are processed, it is necessary to detect their various dimensional data.

[0003] Some shaft parts have two segments with different diameters, and a step surface is formed between the two segments. Each segment is designed to cooperate with different mating parts. To ensure the mating precision of each segment with the corresponding mating part, it is necessary to ensure that the length of each segment is within the design range. Therefore, after the processing of such parts is completed, it is necessary to detect the length of each segment to screen out unqualified products.

[0004] Currently, for the above-mentioned shaft parts with two segments of different diameters, usually, an operator uses a vernier caliper to measure the length of each segment manually, and the detection efficiency is relatively low. Therefore, it is necessary to design a part length detection device to quickly complete the length detection work of each segment of the part. Summary of the Invention

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

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

[0007] In a first aspect, the present application provides a part length detection device, and the technical solution adopted is as follows:

[0008] A part length detection device includes:

[0009] A base;

[0010] A length sensor, which is connected to the base;

[0011] A support member, which is connected to the base and is spaced from the length sensor in a first direction. The first direction is parallel to the telescopic movement direction of the detection head of the length sensor. The support member is used to axially support the part to be measured;

[0012] A support structure, which is arranged on the base and is located between the length sensor and the support member. The support structure is used to support the part to be measured whose axis is parallel to the first direction. When the part to be measured is located on the support structure, it can move axially;

[0013] A reference part, which is connected to the base and located between the length sensor and the support part;

[0014] A measuring assembly for measuring the distance between the reference part and the base in the first direction;

[0015] Wherein, the length sensor and the reference part can move relative to the base in the first direction, the reference part can move to contact the stepped surface of the part to be measured located on the support structure, and is adapted to drive the part to move by moving the length sensor close to the support part, and drive the reference part in contact with the stepped surface to move close to the support part through the part.

[0016] Preferably, the reference part includes a reference position and a starting position that are spaced apart in the first direction, the reference position is close to the support part, when the standard part is abutted against the support part at one end on the support structure, the stepped surface contacts the reference part at the reference position, and a reset driving part for driving the reference part to move to the starting position is provided on the base.

[0017] Preferably, the measuring assembly includes a measuring part and a detecting part, the measuring part can move relative to the base in the first direction, the measuring part is connected to the reference part through a transmission structure, when the reference part moves in the first direction, it drives the measuring part to move in the first direction through the transmission structure, the detecting part is connected to the support part, and the detecting part is used for measuring the distance between it and the measuring part.

[0018] Preferably, the distance that the reference part moves relative to the base is less than the distance that it drives the measuring part to move through the transmission structure.

[0019] Preferably, the transmission structure includes:

[0020] A driving rack, which is connected to the reference part and has a length direction parallel to the first direction;

[0021] A driven rack, which is connected to the measuring part and has a length direction parallel to the first direction;

[0022] A driving gear, which is rotatably connected to the base and meshes with the driving rack;

[0023] A driven gear, which is coaxially fixed with the driving gear and meshes with the driven rack, and the diameter of the driven gear is larger than the diameter of the driving gear.

[0024] Preferably, the detecting part includes a laser displacement sensor, a reference surface perpendicular to the first direction is provided on the measuring part, and the laser displacement sensor is used for detecting the distance between it and the reference surface in the first direction.

[0025] Preferably, a transmission rod is provided between the length sensor and the support structure. The axis of the transmission rod is parallel to the first direction. The transmission rod can move relative to the base in the first direction and can also move relative to the length sensor. The transmission rod can move to a position where one end of it contacts the probe of the length sensor, and can also move to contact one end of the part to be measured located on the support structure. The resistance of the transmission rod moving relative to the length sensor in the first direction is greater than the resistance of the part to be measured moving axially on the support structure. When the length sensor moves closer to the support, the part to be measured is driven to move closer to the support through the transmission rod.

[0026] Preferably, the length sensor and the transmission rod are connected to the base through a connecting seat. The connecting seat can move relative to the base in the first direction. The length sensor is fixed on the connecting seat. The transmission rod can move relative to the connecting seat in the first direction. An elastic member is provided between the transmission rod and the connecting seat. When the transmission rod moves closer to the length sensor relative to the connecting seat, it overcomes the elastic force of the elastic member.

[0027] 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 for detection.

[0028] Compared with the prior art, the technical solution of the present application has at least the following beneficial technical effects:

[0029] 1. This application measures the overall length of the part to be measured through the cooperation of a length sensor and a support member, and measures the length of a section with a smaller diameter of the part through the cooperation of a reference member and a measuring assembly; during actual design, the detection head of the length sensor faces the support member, and when the part is placed on the support structure, it is located on the moving path of the length sensor. During measurement, the part is placed on the support structure, and a gap is left between the part and the support member. At the same time, the reference member is moved to contact the stepped surface of the part; the length sensor moves a set stroke close to the support member. When the length sensor moves to make the detection head contact the part to be measured and continues to move to drive the part to move closer to the support member, it is designed that the part contacts the support member before the length sensor reaches the set stroke; when the length sensor reaches the set stroke, the part causes the detection head to move, thereby causing the length sensor to generate a reading. According to the set distance between the length sensor and the support member when it reaches the set stroke position and does not generate a reading, and the reading of the length sensor, the length of the part to be measured can be calculated. By comparing with the standard data, it can be judged whether the total length of the part is qualified. When the part is driven by the length sensor to move closer to the support member, the part drives the reference member to move closer to the support member through the stepped surface. When the length sensor moves to the maximum stroke position, at this time the part contacts the support member and the stepped surface contacts the reference member. By measuring the distance between the reference member and the support member with the measuring assembly, and according to the set thickness data of the reference member, the distance from the stepped surface of the part to the support member, that is, the length of the section with a smaller diameter of the part, can be calculated. Then, according to the measured total length of the part, the length of the section with a larger diameter of the part can be calculated, completing the measurement of each section of the part. After that, compare with the corresponding standard values respectively to judge whether the lengths of each section and the total length of the part are qualified, so as to complete the length detection of the part. Therefore, this application can complete the length measurement of each section with different total lengths and diameters of the part at one time, thereby quickly completing the length detection of the part and improving the detection efficiency.

[0030] 2. This application is provided with a reset driving member. Before each measurement, the reference member is driven by the reset driving member to move to the starting position. During design, when the reference member contacts the stepped surface of the part to be measured at the starting position, the part to be measured and the support member are spaced apart. In this way, when the part moves closer to the support member, it will first move to make the stepped surface contact the reference member and maintain the contact state to drive the reference member to move closer to the support member, that is, to keep the reference member in contact with the stepped surface of the part to be measured, so as to accurately calculate the length of the section with a smaller diameter of the part according to the thickness data of the reference member and the measured distance data from the support member. The reset driving member can adopt an electric or pneumatic driving device to achieve automatic control.

[0031] 3. In this application, the measuring component is set to include a measuring element and a detecting element. When the reference element moves, the measuring element is moved through a transmission structure, converting the movement of the reference element into the movement of the measuring element. The distance between the reference element and the support element is calculated by measuring the distance between the measuring support element and the measuring element. The position of the measuring element has a higher selectivity, making it more convenient to set up the detecting component. At the same time, the distance that the reference element moves relative to the base is set to be less than the distance that it drives the measuring element to move through the transmission structure. That is, when the part contacts the support element, the distance between the position of the reference element and the reference position is magnified and converted into the distance between the measured position of the measuring element and the position of the measuring element when the reference element is at the reference position, making the measurement data of the detecting element larger, reducing the influence of tiny measurement errors, and improving the measurement accuracy. The thickness of the reference element, the distance between the position of the measuring element and the support element when the reference element is at the reference position, the distance between the reference element and the support element when the reference element is at the reference position, and the magnification factor of the transmission structure are all set values, and the length of the smaller diameter section of the part can be calculated. Further, the detecting element 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 and the total length data of the part, and judge whether the length of each section is qualified to achieve the automatic detection of the part length.

[0032] 4. In this application, by setting a transmission rod, the transmission rod contacts the part to be measured instead of the length sensor. During measurement, first, the transmission rod contacts the part to be measured and drives the part to be measured to move. Since the resistance of the transmission rod moving relative to the length sensor is greater than the moving resistance of the part to be measured, before the part to be measured moves to contact the support element, there is no relative displacement between the transmission rod and the length sensor, and the measurement data of the length sensor does not change, ensuring that the part moves to contact the support element. After the part to be measured moves to contact the support element, the transmission rod continues to move and has a relative movement with the length sensor, which makes the data of the length sensor change, thus ensuring that the data measured by the length sensor is the data when the part contacts the support element, improving the accuracy of the measurement data. And through the setting of the elastic element, after each measurement is completed, when the length sensor resets to the initial position, the transmission rod can reset to the initial position under the elastic force of the elastic element, even if the length sensor is vertically zeroed, so as to facilitate the detection work of the next part. The whole process can be automatically completed, facilitating the automation of the detection work. Description of the Drawings

[0033] Figure 1 It is a schematic structural diagram of the part length detection device provided by the embodiment of the present invention;

[0034] Figure 2 It is a top view schematic diagram of the part length detection device provided by the embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the transmission structure in the part length detection device provided by the embodiment of the present invention.

[0036] Explanation of reference numerals:

[0037] 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 assembly; 61. Measuring member; 611. Reference surface; 62. Detection member; 7. Connecting seat; 71. Mounting plate; 8. Slide block; 9. Guide rail; 10. Reset driving member; 20. Transmission structure; 201. Driving rack; 202. Driven rack; 203. Driving gear; 204. Driven gear; 30. Transmission rod; 301. Limiting block; 40. Elastic member; 50. Driving 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 so that the disclosure of the present application is more thorough and comprehensive.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled 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 (such as rotating 90 degrees or other orientations), and the spatial description terms used herein are accordingly interpreted.

[0041] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or connected to the other component through an intermediate component. In the following embodiments, "connection", if there is a transfer of electrical signals or data 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 "comprise / include" or "have" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0043] Referring to Figures 1-3 As shown, an embodiment of the present application provides a part length detection device, which includes a base 1 and a length sensor 2, a support member 3, a support structure 4, a reference member 5 and a measurement assembly 6 connected to the base 1. The support member 3 and the length sensor 2 are spaced apart in a first direction, and the first direction is parallel to the telescopic movement direction of the detection head of the length sensor 2. The support member 3 is used to axially support the part to be measured. The support structure 4 is located between the length sensor 2 and the support member 3 and is used to support the part to be measured whose axis is parallel to the first direction. When the part to be measured is located on the support structure 4, it can move axially. The reference member 5 is located between the length sensor 2 and the support member 3. The measurement assembly 6 is used to measure the distance between the reference member 5 and the base 1 in the first direction. Among them, the length sensor 2 and the reference member 5 can move relative to the base 1 in the first direction. The reference member 5 can move to contact the step surface of the part to be measured located on the support structure 4, and is adapted to drive the part to move by moving the length sensor 2 close to the support member 3, and drive the reference member 5 in contact with the step surface to move close to the support member 3 through the part.

[0044] Referring to Figures 1-2As shown in the figure, during the design, the detection head of the length sensor 2 faces the support 3, and when the part is placed on the support structure 4, it is 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 left between the part and the support 3. At the same time, the reference part 5 is moved to contact the stepped surface of the part. The length sensor 2 moves a set stroke from the starting position close to the support 3. The length sensor 2 moves until the detection head contacts the part to be measured and continues to move to drive the part to move closer 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 causes the detection head to move, thereby causing the length sensor 2 to generate a reading. According to the set distance between the length sensor 2 and the support 3 when it reaches the set stroke position and does not generate a reading, and the reading of the length sensor 2, the length of the part to be measured can be calculated. By comparing with the standard data, it can be determined whether the total length of the part is qualified.

[0045] When the part is driven by the length sensor 2 to move closer to the support 3, the part drives the reference part 5 to move closer to the support 3 through the stepped surface. When the length sensor 2 moves to the maximum stroke position, at this time the part contacts the support 3 and the stepped 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 stepped surface of the part to the support 3, that is, the length of the smaller diameter section of the part, can be calculated. Then, according to the measured total length of the part, the length of the larger diameter section of the part can be calculated, completing the measurement of each section length of the part. After that, it is respectively compared with the corresponding standard values 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 with different total lengths and diameters of the part can be completed at one time, thus quickly completing the length detection of the part and improving the detection efficiency.

[0046] Refer to Figures 1-2 As shown in the figure, among them, the base 1 provides a support foundation. In this embodiment, the base 1 is set horizontally, and the first direction is the horizontal direction for illustration and description.

[0047] Refer to Figures 1-2 As shown in the figure, specifically, the length sensor 2 is connected to the base 1 through the connecting seat 7. The connecting seat 7 can move relative to the base 1 in 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. An installation plate 71 perpendicular to the first direction is provided on the connecting seat 7. The length sensor 2 passes through the installation plate 71 and is fixed on the installation plate 71. A driving cylinder 50 is provided on the base 1 to drive the connecting seat 7 to move in the first direction, so as to drive the length sensor 2 to move in the first direction through the cylinder, realize the automatic control of the movement of the length sensor 2, and can accurately control the movement stroke of the length sensor 2.

[0048] Refer toFigures 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.

[0049] Reference Figures 1-2 As 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.

[0050] Reference Figures 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.

[0051] Reference Figures 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.

[0052] Referring to Figures 1-2 As shown, further, the measuring assembly 6 includes a measuring member 61 and a detecting member 62. The measuring member 61 can move relative to the base 1 in the first direction. The measuring member 61 is connected to the reference member 5 through a transmission structure 20. When the reference member 5 moves in the first direction, it drives the measuring member 61 to move in the first direction through the transmission structure 20. The detecting member 62 is connected to the support member 3, and the detecting member 62 is used to measure the distance between it and the measuring member 61. Specifically, the measuring member 61 is also movably mounted on the base 1 through the cooperation of a guide rail 9 and a slider 8, and the measuring member 61 and the reference member 5 are spaced apart in a direction perpendicular to the first direction. The movement of the reference member 5 is converted into the movement of the measuring member 61, and the distance between the reference member 5 and the support member 3 is calculated by measuring the distance between the support member 3 and the measuring member 61. The position of the measuring member 61 has a higher selectivity, so as to more conveniently set the detecting assembly.

[0053] Referring to Figures 2-3 As shown, to improve the accuracy of the measurement result of the length of the smaller diameter section of the part, the distance that the reference member 5 moves relative to the base 1 is set to be less than the distance that it drives the measuring member 61 to move through the transmission structure 20, that is, the distance between the position of the reference member 5 when the part contacts the support member 3 and the reference position is magnified, and is converted into the distance between the actual measured position of the measuring member 61 and the position of the measuring member 61 when the reference member 5 is at the reference position. At this time, the measurement data of the detecting member 62 is larger, so as to reduce the influence of the tiny error of the measurement data and improve the measurement accuracy. In the design, the thickness of the reference member 5, the distance between the position of the measuring member 61 when the reference member 5 is at the reference position and the support member 3, the distance between the reference member 5 and the support member 3 when the reference member 5 is at the reference position, and the magnification factor of the transmission structure 20 are all set values. When specifically calculating, according to the data detected by the detecting member 62 and the distance between the position of the measuring member 61 when the reference member 5 is at the reference position and the support member 3, the distance between the actual position of the measuring member 61 and the position of the measuring member 61 when the reference member 5 is at the reference position can be calculated. Then, according to the magnification factor of the transmission structure 20, the distance between the actual position of the reference member 5 and the reference position can be calculated. Then, according to the distance between the reference member 5 and the support member 3 when the reference member 5 is at the reference position and the thickness of the reference member 5, the distance from the step surface of the part to the support surface 31 of the support member 3, that is, the length of the smaller diameter section of the part, can be calculated.

[0054] Referring to Figures 2-3As shown in the figure, the transmission structure 20 includes a driving rack 201, a driven rack 202, a driving gear 203 and a driven gear 204. The driving rack 201 is connected to the reference part 5 and its length direction is parallel to the first direction. The driven rack 202 is connected to the measuring part 61 and its length direction is parallel to the first direction. The driving gear 203 is rotatably connected to the base 1 and meshes with the driving rack 201. The 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 larger than that of the driving gear 203. Specifically, the driving 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 driving gear 203 and the driven gear 204 are distributed up and down, the driving rack 201 is fixed on the slider 8 mounted on the reference part 5, and the driven rack 202 is mounted on the slider 8 mounted on the measuring part 61.

[0055] Referring to Figure 1 As shown in the figure, further, the detecting part 62 includes a laser displacement sensor. A reference plane 611 perpendicular to the first direction is provided on the measuring part 61. The laser displacement sensor is used to detect the distance between it and the reference plane 611 in the first direction. Specifically, the laser displacement sensor is fixed on the support part 3. One side of the measuring part 61 close to the support part 3 is the reference plane 611, and the measuring part 61 is located on the detection light path of the laser displacement sensor to measure the distance between the reference plane 611 and the support part 3 through the laser displacement sensor.

[0056] Further, to realize the automatic control of the whole detection process, the length sensor 2, the laser displacement sensor, the driving cylinder 50 and the cylinders of the reset driving part 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 and the total length data of the part, and judges whether the part is qualified according to the preset standard value.

[0057] Referring to Figures 1-2 As shown in the figure, further, 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 along the first direction and can also 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 also move to contact one end of the part to be measured located on the support structure 4. The resistance of the transmission rod 30 moving relative to the length sensor 2 along the first direction is greater than the resistance of the part to be measured moving axially on the support structure 4. When the length sensor 2 moves close to the support part 3, the part to be measured is driven to move close to the support part 3 through the transmission rod 30.

[0058] With this setting, the transmission rod 30 contacts the part to be measured instead of the length sensor 2. During measurement, first, the transmission rod 30 contacts the part to be measured and drives the part to be measured to move. Since the resistance of the transmission rod 30 moving relative to the length sensor 2 is greater than the moving resistance of the part to be measured, before the part to be measured moves into contact with 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, ensuring that the part moves into contact with the support 3. After the part to be measured moves into contact with the support 3, the transmission rod 30 continues to move and has a relative movement with the length sensor 2, which causes the data of the length sensor 2 to change, thereby ensuring that the data measured by the length sensor 2 is the data when the part contacts the support 3, so as to improve the accuracy of the measurement data.

[0059] In this embodiment, an installation plate 71 for installing the transmission rod 30 is further provided on the connection seat 7. The two installation plates 71 are spaced apart along the first direction. The transmission rod 30 is installed on the installation plate 71 close to the support 3 and is coaxially arranged with the length sensor 2. The transmission rod 30 passes through the installation plate 71 and can move relative to the installation plate 71 along the first direction.

[0060] Refer to Figures 1-2 As shown, an elastic member 40 is provided between the transmission rod 30 and the connection seat 7. When the transmission rod 30 moves relative to the connection seat 7 closer to the length sensor 2, it overcomes the elastic force of the elastic member 40. Through the setting of the elastic member 40, the moving resistance of the transmission rod 30 can be made greater than the moving resistance of the part to be measured, and after each measurement is completed, when the length sensor 2 resets to the initial position, the transmission rod 30 can reset to the initial position under the action of the elastic force of the elastic member 40, that is, the length sensor 2 is vertically zeroed, so as to facilitate the detection work of the next part. The whole process can be automatically completed, which is convenient for realizing the automation of the detection work.

[0061] Refer to Figures 1-2 As shown, specifically, the elastic member 40 is a spring. A limiting block 301 is coaxially sleeved outside one end of the transmission rod 30 close to the length sensor 2. The limiting block 301 is fixed to the transmission rod 30. The spring is coaxially sleeved outside the length sensor 2 and the transmission rod 30, and both ends of the spring respectively abut against the installation plate 71 where the length sensor 2 is located and the limiting block 301.

[0062] When performing detection in this embodiment, first, the driving cylinder 50 is used to drive the connecting seat 7 to reset to the starting position, and the reset driving member 10 is used to drive the reference member 5 to move to the initial position; the part is placed on the two support plates 41. After the part is in place, the control system controls the driving cylinder 50 to operate, driving the connecting seat 7 to move a set stroke close to the support member 3 until it reaches 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, calculates the length data of each section of the part and the total length data, 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 reset driving member 10 drives the reference member 5 to move to the initial position; the detection work of the next part is carried out. The entire detection process can be automated, and with an automated feeding device, automated detection of batch parts can be achieved.

[0063] This embodiment also provides a method for detecting the length of a part, which uses the above-mentioned device for detecting the length of a part for detection.

[0064] 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 principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A part length detection device, characterized in that, Comprising: Base (1); Length sensor (2), which is connected to the base (1); Support member (3), which is connected to the base (1) and is spaced from the length sensor (2) in a first direction, the first direction being parallel to the telescopic movement direction of the probe of the length sensor (2), and the support member (3) is used for axially supporting the part to be measured; Support structure (4), which is arranged on the base (1) and is located between the length sensor (2) and the support member (3), and the support structure (4) is used for supporting the part to be measured with an axis parallel to the first direction, and the part to be measured can move axially when it is located on the support structure (4); Reference member (5), which is connected to the base (1) and is located between the length sensor (2) and the support member (3); Measurement assembly (6), which is used for measuring the distance between the reference member (5) and the support member (3) in the first direction; The length sensor (2) and the reference member (5) can move relative to the base (1) in the first direction, the reference member (5) can move to contact the stepped surface of the part to be measured located on the support structure (4), the reference member (5) includes a reference position and a starting position that are spaced apart in the first direction, the reference position is close to the support member (3), when one end of the standard part located on the support structure (4) abuts against the support member (3), the stepped surface contacts the reference member (5) located at the reference position, and a reset driving member (10) for driving the reference member (5) to move to the starting position is provided on the base (1); Wherein, it is adapted to drive the part to move by moving the length sensor (2) close to the support member (3). During the movement of the part, the stepped surface contacts the reference member (5) located at the starting position and drives the reference member (5) in contact with the stepped surface to move close to the support member (3). When the part to be measured moves to contact the support member (3) and the length sensor (2) moves to the set travel position, the total length of the part is calculated according to the reading of the length sensor (2) and the set distance between the length sensor (2) and the support member (3) when the length sensor (2) reaches the set travel position and no reading is generated. The length of the smaller diameter section of the part is calculated according to the measurement data of the measurement assembly (6) and the thickness of the reference member (5), and the length of the larger diameter section of the part is calculated according to the total length of the part and the length of the smaller diameter section of the part. The total length of the part, the length of the smaller diameter section of the part, and the length of the larger diameter section of the part are respectively compared with the corresponding standard values to determine whether the lengths of each section and the total length of the part are qualified.

2. The part length detection device according to claim 1, characterized in that: The measurement component (6) includes a measuring member (61) and a detecting member (62). The measuring member (61) is movable relative to the base (1) in a first direction. The measuring member (61) is connected to the reference member (5) through a transmission structure (20). When the reference member (5) moves in the first direction, it drives the measuring member (61) to move in the first direction through the transmission structure (20). The detecting member (62) is connected to the support member (3), and the detecting member (62) is used to measure the distance between it and the measuring member (61).

3. The part length detection device according to claim 2, wherein: The distance that the reference member (5) moves relative to the base (1) is less than the distance that it drives the measuring member (61) to move through the transmission structure (20).

4. The part length detection device according to claim 3, characterized in that, The transmission structure (20) includes: A driving rack (201) which is connected to the reference member (5) and whose length direction is parallel to the first direction; A driven rack (202) which is connected to the measuring member (61) and whose length direction is parallel to the first direction; A driving gear (203) which is rotatably connected to the base (1) and meshes with the driving rack (201); A driven gear (204) which is coaxially fixed to the driving gear (203) and meshes with the driven rack (202), and the diameter of the driven gear (204) is larger than the diameter of the driving gear (203).

5. The part length detection device according to claim 2, characterized in that: The detecting member (62) includes a laser displacement sensor. 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 it and the reference plane (611) in the first direction.

6. The part length detection device according to claim 1, wherein: 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) is movable relative to the base (1) in the first direction and movable 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) moving relative to the length sensor (2) in the first direction is greater than the resistance of the measured part moving axially on the support structure (4). When the length sensor (2) moves closer to the support member (3), it drives the measured part to move closer to the support member (3) through the transmission rod (30).

7. The part length detection device according to claim 6, wherein: The length sensor (2) and the transmission rod (30) are connected to the base (1) through a connecting seat (7). The connecting seat (7) is movable relative to the base (1) in the first direction. The length sensor (2) is fixed to the connecting seat (7). The transmission rod (30) is movable relative to the connecting seat (7) in the first direction. An elastic member (40) is provided between the transmission rod (30) and the connecting seat (7). When the transmission rod (30) moves closer to the length sensor (2) relative to the connecting seat (7), it overcomes the elastic force of the elastic member (40).

8. A method for detecting the length of a part, characterized in that: Detect by using the part length detection device described in any one of claims 1-7.

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