Axial clearance detection device

Abstract

The invention relates to the technical field of mechanical transmission part detection, in particular to an axial clearance detection device. Comprising a rack, a transverse moving mechanism, a nut pressing mechanism, a lead screw positioning and loading mechanism and a detection mechanism. The transverse moving mechanism is used for bearing and conveying a to-be-detected assembly formed by screwing a to-be-detected screw rod and a to-be-detected nut to a detection station; the nut pressing mechanism is located above the detection station. The lead screw positioning and loading mechanism comprises a lead screw pressing assembly and a lead screw jacking assembly which are oppositely arranged on the upper side and the lower side of the detection station, and the detection mechanism is connected to the lead screw pressing assembly, moves along with the lead screw pressing assembly and is used for conducting measurement reference calibration when the lead screw pressing assembly positions the lead screw. And the axial displacement of the screw rod is detected when the screw rod jacking assembly jacks the screw rod. Feeding and conveying of a to-be-tested assembly, reliable fixing of a nut, precise positioning and bidirectional loading of a lead screw and automatic measurement and acquisition of the clearance amount are automatically completed, and a traditional manual operation mode is thoroughly replaced.

Description

Technical Field

[0001] This invention relates to the field of mechanical transmission component testing technology, and in particular to an axial clearance testing device. Background Technology

[0002] In the field of mechanical manufacturing and assembly, the lead screw and nut are key transmission pairs, and their mating clearance (especially axial clearance) directly affects transmission accuracy, smoothness, and lifespan. Accurate measurement of this clearance is crucial for quality control and product performance evaluation. Currently, the detection of the axial clearance of the lead screw and nut pair largely relies on manual operation and manual reading, such as using a dial indicator with manual loading. These methods suffer from low efficiency, large human error, and poor consistency, making it difficult to meet the demands of modern automated production lines for high-volume, high-precision, and high-efficiency testing. Therefore, existing technology lacks a dedicated device capable of automatically, quickly, and accurately detecting the axial clearance of the lead screw and nut. Summary of the Invention

[0003] The present invention aims to overcome the shortcomings of the prior art and provide an axial clearance detection device that can achieve automated detection.

[0004] In a first aspect, the present invention provides an axial clearance detection device, comprising: a frame, a transverse movement mechanism, a nut tightening mechanism, a lead screw positioning and loading mechanism, and a detection mechanism; The transverse movement mechanism, the nut clamping mechanism, and the lead screw positioning and loading mechanism are all mounted on the frame; The traversing mechanism is used to carry and transport the component to be tested, which is formed by the engagement of the lead screw and the nut to be tested, to the testing station; The nut clamping mechanism is located above the testing station and is used to clamp and fix the nut to be tested during testing; The lead screw positioning and loading mechanism includes a lead screw pressing component and a lead screw lifting component disposed opposite to each other on the upper and lower sides of the detection station. The lead screw pressing component is used to position the lead screw to be tested from above and apply downward pressure, and the lead screw lifting component is used to position the lead screw to be tested from below and apply lifting force. The detection mechanism is connected to and moves with the lead screw pressing assembly. It is used to perform measurement benchmark calibration when the lead screw is positioned by the lead screw pressing assembly, and to detect the axial displacement of the lead screw when the lead screw is lifted by the lead screw lifting assembly.

[0005] In an optional embodiment, the lateral movement mechanism includes a linear guide, a slider, a placement platform, and a lateral movement cylinder; The linear guide rail is fixed to the frame; The slider is slidably mounted on the linear guide rail; The placing table is fixed on the sliding block, and the placing table is provided with a stepped hole for accommodating and positioning the nut to be tested; The transverse moving cylinder is fixed on the frame, and the output end thereof is connected with the placing table or the sliding block.

[0006] In an optional embodiment, a buffer is arranged on the frame, and the buffer is located at one end of the linear guide rail away from the transverse moving cylinder.

[0007] In an optional embodiment, the nut pressing mechanism comprises two nut pressing cylinders, a linkage seat and a nut pressing seat. The two nut pressing cylinders are symmetrically arranged on the frame. The linkage seat is connected with the output ends of the two nut pressing cylinders. The nut pressing seat is connected below the linkage seat.

[0008] In an optional embodiment, the lower surface of the nut pressing seat is provided with a stepped structure, and when the nut pressing seat is pressed downward, the stepped structure can simultaneously clamp the outer edge of the side wall and the top end face of the nut to be tested, so as to limit the movement of the nut to be tested in the horizontal direction and the vertical direction.

[0009] In an optional embodiment, the linkage seat and the center of the nut pressing seat are provided with a guiding hole penetrating upward and downward.

[0010] In an optional embodiment, the screw rod pressing assembly comprises a screw rod pressing cylinder, a first pressure sensor, a connecting seat and a screw rod pressing seat. The screw rod pressing cylinder is fixed on the frame. The first pressure sensor is connected with the output end of the screw rod pressing cylinder. The connecting seat is connected below the first pressure sensor. The screw rod pressing seat is connected with the lower end of the connecting seat, and the lower end of the screw rod pressing seat is provided with a screw rod positioning hole for accommodating and limiting the rotation of the upper end of the screw rod to be tested. The detection mechanism comprises a sensor seat arranged on the connecting seat and a displacement sensor arranged on the sensor seat.

[0011] In an optional embodiment, a calibration seat fixed on the frame is further arranged between the connecting seat and the linkage seat. The calibration seat is provided with a calibration hole corresponding to the probe of the displacement sensor.

[0012] In an optional embodiment, the screw rod lifting assembly comprises a screw rod lifting cylinder, a second pressure sensor and a screw rod lifting seat. The screw rod jacking cylinder is fixed on the rack; The second pressure sensor is connected to the output end of the screw rod jacking cylinder; The screw rod jacking seat is connected above the second pressure sensor, and a screw rod positioning hole for accommodating and limiting rotation of the lower end of the screw rod to be measured is formed in the upper end of the screw rod jacking seat.

[0013] In an optional embodiment, the screw rod jacking assembly further comprises a linear bearing fixed on the rack, and the screw rod jacking seat penetrates through the linear bearing.

[0014] Compared with the prior art, the axial gap detection device provided by the application has the following technical advantages: The axial gap detection device comprises a rack, a transverse moving mechanism, a nut pressing mechanism, a screw rod positioning and loading mechanism, and a detection mechanism. The transverse moving mechanism, the nut pressing mechanism, and the screw rod positioning and loading mechanism are all arranged on the rack. The transverse moving mechanism is used to carry and transport a to-be-measured assembly formed by a to-be-measured screw rod and a to-be-measured nut to a detection station. The nut pressing mechanism is located above the detection station and is used to press and fix the to-be-measured nut during detection. The screw rod positioning and loading mechanism comprises a screw rod pressing-down assembly and a screw rod jacking assembly arranged oppositely on the upper and lower sides of the detection station. The screw rod pressing-down assembly is used to position the to-be-measured screw rod from above and apply a pressing-down force. The screw rod jacking assembly is used to position the to-be-measured screw rod from below and apply a jacking force. The detection mechanism is connected to the screw rod pressing-down assembly and moves with the screw rod pressing-down assembly. The detection mechanism is used to calibrate a measurement reference when the screw rod pressing-down assembly positions the screw rod and detect an axial displacement amount of the screw rod when the screw rod jacking assembly jacks up the screw rod.

[0015] By integrating the transverse moving mechanism, the nut pressing mechanism, the screw rod positioning and loading mechanism, and the detection mechanism, a complete automatic detection system is constructed. The device can automatically complete feeding and conveying of the to-be-measured assembly, reliable fixing of the nut, accurate positioning and bidirectional loading of the screw rod, and automatic measurement and acquisition of the gap amount, completely replacing the traditional manual operation mode. Thus, efficient, accurate, and consistent automatic detection of the axial gap of the screw rod and nut pair is realized, and the detection efficiency and reliability of the results are significantly improved.

[0016] Other features and advantages of the application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0018] Fig. 1 The overall structure schematic diagram of the axial gap detection device provided by the embodiment of the present application is shown in the figure. Fig. 2 The schematic diagram of the cross-moving cylinder in the extended state is shown in the figure. Fig. 3 The schematic diagram of the screw rod jacking cylinder in the extended state is shown in the figure.

[0019] Figure: 1-frame; 2-screw rod down pressure cylinder; 3-first pressure sensor; 4-connection seat; 5-calibration seat; 6-calibration hole; 7-sensor seat; 8-displacement sensor; 9-nut down pressure cylinder; 10-linkage seat; 11-nut pressure seat; 12-guide port; 13-linear guide rail; 14-sliding block; 15-buffer; 16-placing table; 17-cross-moving cylinder; 18-screw rod jacking cylinder; 19-second pressure sensor; 20-linear bearing; 21-screw rod to be measured; 22-nut to be measured; 23-screw rod down seat; 24-screw rod jacking seat. DETAILED DESCRIPTION

[0020] The technical solutions of the present application will be described clearly and completely below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work belong to the scope of protection of the present application.

[0021] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] In addition, the technical solutions among various embodiments can be combined with each other, but the combination of the technical solutions should be considered not to exist and not within the protection scope of the present application on the basis that the combination of the technical solutions can be realized by the ordinary skilled in the art, and the combination of the technical solutions cannot be realized.

[0024] The present application will be further described in detail below by means of specific embodiments and in conjunction with the drawings.

[0025] The specific structure is shown in Figs. 1 to 3 .

[0026] The present embodiment provides an axial gap detection device, which comprises a rack 1, a transverse moving mechanism, a nut pressing mechanism, a screw rod positioning and loading mechanism, and a detection mechanism. All the mechanisms are installed and arranged based on the rack 1.

[0027] The transverse moving mechanism is used to realize automatic feeding and positioning of the component to be measured. In the present embodiment, the transverse moving mechanism comprises a linear guide rail 13, a sliding block 14, a placement table 16, and a transverse moving cylinder 17. The linear guide rail 13 is fixedly installed on the rack 1. The sliding block 14 is slidingly arranged on the linear guide rail 13. The placement table 16 is fixedly installed on the sliding block 14, and the placement table 16 is provided with stepped holes for accommodating and preliminarily positioning the nut 22 to be measured. The transverse moving cylinder 17 is fixedly installed on the rack 1, and its output end is connected with the placement table 16 (in other embodiments, it can also be connected with the sliding block 14), which is used to drive the placement table 16 to reciprocally move along the linear guide rail 13 between a feeding position for loading the component to be measured and a detection station for detection. Automatic and stable conveying of the component to be measured is realized, which provides a basis for continuous detection.

[0028] Further, a buffer 15 is arranged on the rack 1, and the buffer 15 is located at an end of the linear guide rail 13 away from the transverse moving cylinder 17. When the transverse moving cylinder 17 drives the placement table 16 to move to the detection station, the buffer 15 can play a role of buffering and mechanical limiting, so that the placement table 16 can be accurately and gently stopped at the same position each time, and the positioning accuracy and service life of the device are improved.

[0029] The nut pressing mechanism is used to firmly fix the nut 22 to be measured during the detection process, so as to eliminate the freedom thereof and create conditions for accurate measurement of the axial displacement of the screw rod. In the present embodiment, the nut pressing mechanism comprises two nut pressing cylinders 9, a linkage seat 10, and a nut pressing seat 11. The two nut pressing cylinders 9 are symmetrically and vertically installed on the rack 1. The linkage seat 10 is connected with the output ends of the two nut pressing cylinders 9, and is synchronously driven by the two cylinders to perform lifting movement. The nut pressing seat 11 is fixedly connected below the linkage seat 10. The linkage seat is driven by the double-cylinder, so that the balance and stability of the pressing force are ensured, and the structure is reliable.

[0030] Preferably, the lower surface of the nut holder 11 is provided with a stepped structure. When the nut holder 11 moves downward under the drive of the nut pressing cylinder 9, the stepped structure can simultaneously clamp the outer edge of the sidewall and the top end surface of the nut 22 to be measured. This design makes the nut 22 to be measured effectively limited in the horizontal direction (left and right, front and back) and the vertical direction, avoiding any micro-motion in the subsequent loading process, and providing a guarantee for high-precision measurement.

[0031] Further, the center of the linkage seat 10 and the nut holder 11 is provided with a through-going guiding hole 12. The guiding hole 12 provides a channel for the up-and-down movement of the lower part of the screw rod pressing assembly (i.e. the screw rod pressing seat 23), preventing interference between mechanisms.

[0032] The screw rod positioning and loading mechanism is used for precise positioning of the screw rod 21 to be measured, and applying a controllable axial force to make it displace relative to the fixed nut. The mechanism includes a screw rod pressing assembly and a screw rod lifting assembly.

[0033] The screw rod pressing assembly is used for operating the screw rod 21 to be measured from above. In this embodiment, the screw rod pressing assembly includes a screw rod pressing cylinder 2, a first pressure sensor 3, a connecting seat 4, and a screw rod pressing seat 23. The screw rod pressing cylinder 2 is vertically fixedly installed on the rack 1. The first pressure sensor 3 is connected to the output end of the screw rod pressing cylinder 2. The connecting seat 4 is connected below the first pressure sensor 3. The screw rod pressing seat 23 is connected to the lower end of the connecting seat 4, and the lower end of the screw rod pressing seat 23 is provided with a screw rod positioning hole for accommodating and limiting the rotation of the upper end of the screw rod 21 to be measured. The first pressure sensor 3 can monitor the pressing force in real time, facilitating force closed-loop control (in other embodiments, the first pressure sensor can also be omitted, and the force value can be estimated by air pressure or current). Its technical effect lies in realizing accurate positioning and controllable pressing of the upper end of the screw rod, and monitoring and adjusting the pressing force.

[0034] The detection mechanism is connected to the screw rod pressing assembly and moves with it. Specifically, the detection mechanism includes a sensor seat 7 and a displacement sensor 8. The sensor seat 7 is installed on the connecting seat 4, and the displacement sensor 8 is installed on the sensor seat 7. The displacement measurement reference is directly associated with the positioning action of the upper end of the screw rod, the measurement path is direct, and the principle is clear.

[0035] Further, the device also includes a calibration seat 5 fixed to the rack 1. The calibration seat 5 is located between the connecting seat 4 and the linkage seat 10. The calibration seat 5 is provided with a calibration hole 6 corresponding to the probe of the displacement sensor 8. When the screw rod pressing cylinder 2 drives the screw rod pressing seat 23 to press downward, the upper end of the screw rod 21 to be measured is positioned, and at the same time, the probe of the displacement sensor 8 enters the calibration hole 6 to a certain depth. At this time, the system clears the displacement reading or records it as the initial reference value, thereby completing the zero-point calibration before measurement and eliminating system errors.

[0036] The screw lifting assembly is used to operate the measured screw 21 from below. In the embodiment, the screw lifting assembly comprises a screw lifting cylinder 18, a second pressure sensor 19 and a screw lifting seat 24. The screw lifting cylinder 18 is vertically fixedly installed on the rack 1. The second pressure sensor 19 is connected at the output end of the screw lifting cylinder 18. The screw lifting seat 24 is connected above the second pressure sensor 19, and the upper end of the screw lifting seat 24 is provided with a screw positioning hole for accommodating and limiting the rotation of the lower end of the measured screw 21. The second pressure sensor 19 is used to monitor the lifting force. The accurate positioning and controllable lifting of the lower end of the screw are realized, and the screw lifting assembly cooperates with the lower pressing assembly of the upper end to apply a pure axial force on the screw.

[0037] Further, the screw lifting assembly further comprises a linear bearing 20 fixed to the rack 1. The screw lifting seat 24 penetrates through the linear bearing 20. The linear bearing 20 provides high-precision guidance for the vertical lifting movement of the screw lifting seat 24, effectively prevents the screw lifting seat 24 from tilting or being stuck, ensures that the direction of the lifting force is strictly along the screw axis, and thus ensures the accuracy of the measurement.

[0038] The working process of the embodiment is briefly described as follows: Feeding and transferring: the measured nut 22 is screwed on the measured screw 21 to form a measured assembly. The measured assembly is placed in the stepped hole of the placing table 16. The horizontal moving cylinder 17 is started to push the placing table 16 to the detection station and the buffer 15 buffers and positions.

[0039] Nut pressing: the two nut pressing cylinders 9 are synchronously extended to drive the linkage seat 10 and the nut pressing seat 11 to press downward, and the measured nut 22 is tightly pressed on the placing table 16 through the stepped structure on the lower surface of the nut pressing seat 11 to limit all degrees of freedom of the measured nut 22.

[0040] Screw upper end positioning and zero point calibration: the screw pressing cylinder 2 is extended to drive the connecting seat 4, the screw pressing seat 23 and the displacement sensor 8 to move downward together. The screw positioning hole at the lower end of the screw pressing seat 23 is sleeved on the upper end of the measured screw 21 and presses the upper end of the measured screw 21 to limit the rotation of the upper end of the measured screw 21. At the same time, the probe of the displacement sensor 8 enters the calibration hole 6 of the calibration seat 5, and the system calibrates the position as the measurement zero point.

[0041] Screw lower end lifting and gap measurement: the screw lifting cylinder 18 is extended to drive the screw lifting seat 24 to stably rise, and the screw positioning hole on the screw lifting seat 24 presses the lower end of the measured screw 21. The lifting force is transmitted through the screw, overcomes the friction and pre-tightening force between the nut and the screw thread, and forces the screw to produce upward axial displacement relative to the fixed nut. The displacement sensor 8 detects the displacement of the upper end of the screw in real time, and the displacement is the axial gap between the screw and the nut.

[0042] Reset and discharging: all the air cylinders retract, and all the components reset. The horizontal moving air cylinder 17 pulls the placing table 16 back to the loading position, and the component which has been detected is taken out, and the next round of detection can be performed.

[0043] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An axial clearance detection device, characterized in that, include: The frame (1), the transverse movement mechanism, the nut clamping mechanism, the lead screw positioning and loading mechanism, and the detection mechanism; The transverse movement mechanism, the nut clamping mechanism, and the lead screw positioning and loading mechanism are all mounted on the frame (1); The transverse mechanism is used to carry and transport the component to be tested, which is formed by screwing the lead screw (21) and the nut (22) to be tested, to the testing station; The nut clamping mechanism is located above the testing station and is used to clamp and fix the nut to be tested (22) during testing. The lead screw positioning and loading mechanism includes a lead screw pressing component and a lead screw lifting component disposed opposite to each other on the upper and lower sides of the detection station. The lead screw pressing component is used to position the lead screw (21) to be tested from above and apply downward pressure, and the lead screw lifting component is used to position the lead screw (21) to be tested from below and apply lifting force. The detection mechanism is connected to and moves with the lead screw pressing assembly. It is used to perform measurement benchmark calibration when the lead screw is positioned by the lead screw pressing assembly, and to detect the axial displacement of the lead screw when the lead screw is lifted by the lead screw lifting assembly.

2. The axial clearance detection device according to claim 1, characterized in that, The transverse mechanism includes a linear guide (13), a slider (14), a placement platform (16), and a transverse cylinder (17). The linear guide rail (13) is fixed on the frame (1); The slider (14) is slidably mounted on the linear guide rail (13); The placement platform (16) is fixed on the slider (14), and the placement platform (16) is provided with a stepped hole for accommodating and positioning the nut (22) to be tested; The transverse cylinder (17) is fixed on the frame (1), and its output end is connected to the placement platform (16) or the slider (14).

3. The axial clearance detection device according to claim 2, characterized in that, A buffer (15) is provided on the frame (1), and the buffer (15) is located at the end of the linear guide (13) away from the transverse cylinder (17).

4. The axial clearance detection device according to claim 1, characterized in that, The nut tightening mechanism includes two nut pressing cylinders (9), a linkage seat (10), and a nut pressing seat (11). The two nut-pressing cylinders (9) are symmetrically mounted on the frame (1); The linkage seat (10) is connected to the output ends of the two nut pressing cylinders (9); The nut holder (11) is connected below the linkage seat (10).

5. The axial clearance detection device according to claim 4, characterized in that, The lower surface of the nut holder (11) is provided with a stepped structure. When the nut holder (11) is pressed down, the stepped structure can simultaneously lock the outer edge of the side wall and the top end face of the nut to be tested (22) to restrict the movement of the nut to be tested (22) in the horizontal and vertical directions.

6. The axial clearance detection device according to claim 4, characterized in that, The linkage seat (10) and the nut pressure seat (11) have a guide port (12) that runs vertically through each other.

7. The axial clearance detection device according to claim 4, characterized in that, The lead screw pressing assembly includes a lead screw pressing cylinder (2), a first pressure sensor (3), a connecting seat (4), and a lead screw pressing seat (23); The lead screw pressing cylinder (2) is fixed on the frame (1); The first pressure sensor (3) is connected to the output end of the lead screw pressing cylinder (2); The connector (4) is connected to the lower part of the first pressure sensor (3); The lead screw pressure seat (23) is connected to the lower end of the connecting seat (4), and the lower end of the lead screw pressure seat (23) is provided with a lead screw positioning hole for accommodating and restricting the rotation of the upper end of the lead screw (21) to be tested; The detection mechanism includes a sensor base (7) mounted on the connecting seat (4) and a displacement sensor (8) mounted on the sensor base (7).

8. The axial clearance detection device according to claim 7, characterized in that, It also includes a calibration seat (5) fixed on the frame (1), the calibration seat (5) being located between the connecting seat (4) and the linkage seat (10); The calibration base (5) has a calibration hole (6) corresponding to the probe of the displacement sensor (8).

9. The axial clearance detection device according to claim 1, characterized in that, The lead screw lifting assembly includes a lead screw lifting cylinder (18), a second pressure sensor (19), and a lead screw lifting seat (24). The lead screw lifting cylinder (18) is fixed on the frame (1); The second pressure sensor (19) is connected to the output end of the lead screw lifting cylinder (18); The lead screw lifting seat (24) is connected above the second pressure sensor (19), and the upper end of the lead screw lifting seat (24) is provided with a lead screw positioning hole for accommodating and restricting the rotation of the lower end of the lead screw (21) to be tested.

10. The axial clearance detection device according to claim 9, characterized in that, The lead screw lifting assembly also includes a linear bearing (20) fixed on the frame (1), and the lead screw lifting seat (24) passes through the linear bearing (20).

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