Ball screw detection device

Abstract

The utility model relates to ball screw detection technical field, specifically disclose a ball screw detection device, including clamping module and detection module on the rack, clamping module includes workstation, fixed centre and movable centre, detection module includes support seat, swing seat, space mover and the image acquisition unit of installation in space mover output, support seat is used for along workpiece axial sliding connection on the rack, space mover is installed on swing seat, swing seat is rotatably connected on support seat through support positioning pin, and support positioning pin is horizontally arranged and perpendicular to the sliding direction of support seat, and swing seat is fixedly connected through first locking structure between support seat, space mover is used for driving image acquisition unit to lift and horizontal movement, and the image acquisition unit is used for gathering the image data of ball screw.

Description

Technical Field

[0001] This utility model relates to the field of ball screw testing technology, and specifically to a ball screw testing device. Background Technology

[0002] In modern mechanical manufacturing, ball screws, as precision transmission components, directly affect the performance, lifespan, and stability of the transmission system due to the accuracy of their thread profile and pitch. Therefore, high-precision testing of the ball screw's thread profile and pitch is crucial.

[0003] Traditional ball screw testing methods use micrometers for measurement, which measure pitch or outer diameter using a contact probe. This method is simple to operate and low in cost, as exemplified by the patent publication number CN119756133A, "A device for testing the straightness and cylindricity of ball screws." However, this method cannot measure tooth profile parameters (such as tooth angle and tooth root radius).

[0004] Existing technology, patent publication number CN202501824U, "Steering Screw Thread Raceway Pitch and Coaxiality Detector," discloses a method of clamping the tested screw with a movable center and a fixed center to ensure coaxiality. This technology utilizes a transverse and longitudinal slide to move a displacement sensor, with the probe steel ball contacting the thread raceway. Electrical signals are output through an angle encoder and the displacement sensor to calculate the pitch and coaxiality. This method is more efficient than micrometer measurement and can determine whether the thread raceway is properly formed by checking if the probe steel ball matches the thread raceway. However, this method requires manufacturing corresponding probe steel balls for different thread raceways, which reduces versatility and increases cost. Furthermore, it is difficult to obtain the normal cross-sectional tooth profile, making it impossible to verify tooth profile accuracy. In addition, friction between the probe steel ball and the thread surface may cause wear, affecting the accuracy of the probe steel ball over long-term use. Utility Model Content

[0005] The present invention aims to provide a ball screw testing device to solve the problems of inaccurate measurement of tooth profile parameters, poor versatility of measurement structure, and potential damage to workpiece surface in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A ball screw testing device includes a clamping module and a testing module mounted on a frame. The clamping module includes a worktable, a fixed center and a movable center mounted on the worktable. The testing module includes a support base, a swing base, a spatial mover, and an image acquisition unit mounted on the output end of the spatial mover. The support base is slidably connected to the frame along the workpiece axis. The spatial mover is mounted on the swing base, which is rotatably connected to the support base via a support positioning pin. The support positioning pin is horizontally set and perpendicular to the sliding direction of the support base. The swing base and the support base are locked together by a first locking structure, which locks the swing base, after angular rotation, onto the support base. The spatial mover drives the image acquisition unit to move vertically and horizontally, and the image acquisition unit is used to acquire image data of the ball screw.

[0007] The principle and advantages of this solution are as follows: When it is necessary to obtain the tooth profile of the ball screw under test, this solution only needs to adjust the angle of the swing seat relative to the support seat so that the image acquisition unit can capture the tooth profile of the ball screw under test without obstruction. The normal tooth profile section can be obtained from the captured image data, which facilitates the accurate measurement of key tooth profile parameters such as tooth angle, tooth height, and tooth root arc, avoiding errors and friction damage caused by contact measurement.

[0008] This solution uses a non-contact image data acquisition method to adapt to the testing needs of ball screws of different specifications, thereby improving the versatility of the solution and reducing the cost of use.

[0009] Preferably, as an improvement, the first locking structure includes an arc-shaped adjustment hole and at least two mounting holes. One of the arc-shaped adjustment hole and the mounting hole is located on the swing seat, and the other is located on the support seat. The mounting hole is directly opposite the arc-shaped adjustment hole, and the center of the arc-shaped adjustment hole is coaxial with the rotation center of the support positioning pin. This solution achieves locking between the swing seat and the support seat by inserting locking screws into the mounting hole and the arc-shaped adjustment hole, which is simple and convenient to operate.

[0010] Preferably, as an improvement, a worm gear is rotatably connected to the support base, and a sector-shaped worm wheel is fixed on the swing base. The sector-shaped worm wheel meshes with the worm gear, and the center line of the sector-shaped worm gear is coaxial with the center line of the support positioning pin. This solution can adjust the angle of the image acquisition unit by rotating the worm gear, which makes it convenient for the image acquisition unit to align with the tooth profile of the ball screw being tested and take a normal section picture to obtain a completely unobstructed normal section tooth profile.

[0011] Preferably, as an improvement, the swing seat is provided with scale lines, and the support seat is provided with indicator lines directly opposite the scale lines of the swing seat, so that the rotation angle of the swing seat can be displayed intuitively.

[0012] Preferably, as an improvement, the arc-shaped adjustment hole is a stepped hole, which is set on the swing seat so that the head of the bolt of the locking support seat and the swing seat can be hidden on the step of the arc-shaped adjustment hole, thereby facilitating the installation of the space mover.

[0013] Preferably, as an improvement, the fixed center has a rotary driver for rotating the fixed center. A chuck is detachably connected to the fixed center, and the chuck has a positioning through hole with a locking pin at the bottom. The outer periphery of the ball screw being tested, opposite the positioning through hole, has a flat surface. The locking pin is used to abut against the flat surface of the ball screw being tested. This design allows the angular positioning of the ball screw being tested via the chuck before measurement, ensuring more accurate testing of ball screws with requirements for the starting point of the helix angle.

[0014] Preferably, as an improvement, the positioning through hole includes an arc segment and a V-shaped segment, the flared opening of the V-shaped segment being tangent to the arc segment, and a locking pin threadedly connected to the bottom of the arc segment. This design allows for a larger insertion space for the end of the ball screw with the parallel plane into the positioning through hole of the collet, facilitating the rapid insertion of the ball screw into the positioning through hole.

[0015] Preferably, as an improvement, the positioning through hole has an arc segment, and the top of the arc segment is machined with a horizontal surface parallel to the plane of the workpiece, so that the ball screw being tested can be angularly positioned immediately after insertion, eliminating the need for multiple adjustments to ensure the plane is level, as is the case with positioning through holes having V-shaped segments and arc segments. This makes the operation simple and convenient.

[0016] Preferably, as an improvement, the worktable is rotatably connected to the frame, the rotation center line of the worktable is a vertical line, and a second locking structure is provided between the worktable and the frame. The second locking structure is used to lock the rotation angle after the worktable rotates relative to the frame.

[0017] Preferably, as an improvement, the second locking structure includes an arc-shaped through groove and at least two locking holes, with the locking holes facing the arc-shaped through groove. One of the locking holes and the arc-shaped through groove is set on the worktable, and the other is set on the frame. The center of the arc-shaped through groove is coaxial with the rotation center of the worktable. This solution achieves rapid locking of the worktable and the frame after relative angle adjustment by inserting locking screws into the locking holes and the arc-shaped through groove.

[0018] Preferably, as an improvement, a scale plate is fixed on the worktable, and a pointer corresponding to the scale plate is provided on the frame; an adjusting rod is also threadedly connected to the frame, the adjusting rod is used to press against the side of the worktable away from the rotation center, and a dial gauge is also installed on the frame, the probe of the dial gauge is used to contact the side of the worktable. In this solution, the rotation angle of the worktable is coarsely adjusted by the scale plate and the pointer on the frame, and then the rotation angle of the worktable is finely adjusted by the adjusting rod, and the dial gauge accurately displays the angle of the fine adjustment of the worktable.

[0019] Preferably, as an improvement, the image acquisition unit is a microscope. Attached Figure Description

[0020] Figure 1 This is a front view of the ball screw product for which this embodiment is applied.

[0021] Figure 2 for Figure 1 The right view.

[0022] Figure 3 for Figure 1 AA sectional view.

[0023] Figure 4 for Figure 1 BB section sectional view.

[0024] Figure 5 This is a three-dimensional structural diagram of an embodiment of the present utility model.

[0025] Figure 6 Figure 5 Front view of the ball screw being tested when the fixed center and the movable center are tightly clamped together.

[0026] Figure 7 for Figure 6 A schematic diagram of the three-dimensional structure after rotation.

[0027] Figure 8 for Figure 7 A three-dimensional structural diagram and cross-sectional view of the fixing sleeve used.

[0028] Figure 9 This is a schematic diagram of the structure of one type of clamp in an embodiment of the present utility model (from left to right: three-dimensional structural schematic diagram - right view - front sectional view).

[0029] Figure 10 This is a right-side view of another type of clamp in an embodiment of this utility model.

[0030] Figure 11 This is a three-dimensional structural diagram of the frame and workbench in an embodiment of the present invention.

[0031] Figure 12 for Figure 11 Top view.

[0032] Figure 13 for Figure 5 A three-dimensional structural diagram of the detection module after rotation.

[0033] Figure 14 for Figure 13 Top view.

[0034] Figure 15 for Figure 13 The right view.

[0035] Figure 16 for Figure 13 Rear view.

[0036] Figure 17 for Figure 15 CC section view in the image.

[0037] Figure 18 for Figure 16 DD section view in the image.

[0038] The reference numerals in the accompanying drawings include: frame 100, clamping module 200, detection module 300, worktable 1, fixed center 2, movable center 3, rotary drive 21, fixed sleeve 22, adjusting pin 221, chuck 23, positioning through hole 231, locking pin 232, locking hole 11, scale plate 12, arc-shaped through groove 101, pointer 102, adjusting rod 103, dial gauge 104, X-axis slide rail 105, support base 4, indicator line 41, swing base 5, arc-shaped adjusting hole 51, scale line 52, support positioning pin 45, spatial mover 6, lifting device 61, near and far racks 62, adjusting gear 63, adjusting knob 631, image acquisition unit 7, worm gear 8, adjusting disk 81, sector worm wheel 9, worktable rotation center o, ball screw under test 10, parallel plane 20 on the ball screw under test. Detailed Implementation

[0039] The following detailed description illustrates the specific implementation method: The basic implementation examples are as follows: Figures 5 to 18 As shown.

[0040] Combination Figure 5 A ball screw testing device includes a clamping module 200 and a testing module 300 mounted on a frame 100. The clamping module 200 is used to clamp the ball screw to be tested, and the testing module 300 is used to detect the tooth profile and pitch of the ball screw to be tested.

[0041] I. Clamping Module 200 Combination Figures 5 to 12The clamping module 200 includes a worktable 1, a fixed center 2 and a movable center 3 mounted on the worktable 1.

[0042] The fixed tip 2 is equipped with a rotary driver 21, which drives the fixed tip 2 to rotate. A fixed sleeve 22 is fitted on the fixed tip 2. A U-shaped fork is machined on the fixed sleeve 22. A chuck 23 is inserted into the U-shaped fork. The U-shaped opening of the U-shaped fork is parallel to the axis of the fixed tip 2. Both fork arms of the U-shaped fork have threaded holes for threaded connection of adjusting pins 221. The chuck 23 inserted into the U-shaped fork is pressed against by the adjusting pins 221.

[0043] The chuck 23 has a positioning through hole 231 machined on it. A locking pin 232 is threaded to the bottom of the positioning through hole 231. The outer periphery of the workpiece facing the positioning through hole 231 has a plane (that is, the outer periphery of the shaft end of the ball screw blank in this embodiment has two parallel planes). The locking pin is used to abut against one of the workpiece planes.

[0044] In one embodiment, combined with Figure 9 The positioning through hole 231 includes an arc segment and a V-shaped segment. The flared opening of the V-shaped segment is tangent to the arc segment, and the locking pin is threadedly connected to the bottom of the arc segment. In another embodiment, combined with... Figure 10 The positioning through hole 231 has an arc segment, and the top of the arc segment is machined with a horizontal surface parallel to the plane of the workpiece, so that the ball screw can be angularly positioned after insertion. Unlike the positioning through hole 231 with V-shaped segment and arc segment, it does not require multiple adjustments to whether the plane is horizontal. The operation is simple and convenient.

[0045] The worktable 1 is rotatably connected to the frame 100. The rotation center line of the worktable 1 is a vertical line. A second locking structure is provided between the worktable 1 and the frame 100. The second locking structure is used to lock the rotation angle after the worktable 1 rotates relative to the frame 100.

[0046] The second locking structure includes an arc-shaped through groove 101 and at least two locking holes 11. The locking holes 11 are directly opposite the arc-shaped through groove 101. One locking hole 11 and the arc-shaped through groove 101 are located on the worktable 1, and the other is located on the frame 100. The center of the arc-shaped through groove 101 is coaxial with the rotation center of the worktable 1. In this embodiment, the locking holes 11 are located on the worktable 1, and the arc-shaped through groove 101 is located on the frame 100. There are two arc-shaped through grooves 101, each corresponding to two locking holes 11. Locking screws are inserted into the locking holes 11 and the arc-shaped through groove 101 to achieve rapid locking of the worktable 1 and the frame 100 after relative angle adjustment.

[0047] A scale plate 12 is fixed on the worktable 1, and a pointer 102 corresponding to the scale plate 12 is provided on the frame 100. An adjusting rod 103 is also threadedly connected to the frame 100. The adjusting rod 103 is used to press against the side of the worktable 1 away from the rotation center. A dial gauge 104 is also installed on the frame 100. The probe of the dial gauge 104 is used to contact the side of the worktable 1. In this embodiment, the rotation angle of the worktable 1 is coarsely adjusted by the scale plate 12 and the pointer 102 on the frame 100, and then the rotation angle of the worktable 1 is finely adjusted by the adjusting rod 103. The dial gauge 104 accurately displays the angle of the fine adjustment of the worktable 1.

[0048] II. Detection Module 300 Combination Figure 5 , Figures 13 to 18 The detection module 300 is slidably connected to the frame 100. The detection module 300 includes a support base 4, a swing base 5, a spatial mover 6, and an image acquisition unit 7 installed at the output end of the spatial mover 6. The support base 4 is slidably connected to the frame 100 along the workpiece axis. The support base 4 is slidably connected to the X-axis slide rail 105 provided on the frame 100. The frame 100 is provided with a linear driver, which is used to drive the support base 4 to move along the X-axis. The linear driver is not shown in the figure.

[0049] The swing seat 5 is rotatably mounted on the support seat 4 via a support positioning pin 45 and can be angularly adjusted relative to the support seat 4 around the support positioning pin 45. The support positioning pin 45 is horizontally positioned and perpendicular to the sliding direction of the support seat 4. A spatial mover 6 is mounted on the swing seat 5 and is used to drive the image acquisition unit 7 to move vertically and horizontally. The image acquisition unit 7 is used to acquire image data from the ball screw. In this embodiment, the image data acquisition unit is a microscope.

[0050] Specifically, the swing seat 5, after its angular rotation, is locked to the support seat 4 by a first locking structure. The first locking structure includes an arc-shaped adjustment hole 51 and at least two mounting holes. The mounting holes are directly opposite the arc-shaped adjustment hole 51. The center of the arc-shaped adjustment hole 51 is coaxial with the rotation center of the support positioning pin 45. The arc-shaped adjustment hole 51 is a stepped hole machined on the swing seat 5, and the mounting holes are threaded holes machined on the support seat 4. In this embodiment, there are two mounting holes. The swing seat 5 and the support seat 4 are locked by inserting locking screws into the mounting holes and the arc-shaped adjustment hole 51.

[0051] A worm 8 is rotatably connected to the support base 4, and a sector worm wheel 9 is fixed on the swing base 5. The sector worm wheel 9 meshes with the worm 8, and the center line of the sector worm 8 is coaxial with the center line of the support positioning pin 45. By rotating the worm 8, the angle of the microscope can be adjusted, so that the microscope can be aligned with the tooth profile of the ball screw being tested and the normal section can be photographed to obtain a completely unobstructed normal section tooth profile.

[0052] To facilitate the rotation of the worm gear 8, an adjusting disc 81 is fixedly connected to the worm gear 8.

[0053] The swing seat 5 is provided with a scale line 52, and the support seat 4 is provided with an indicator line 41 that is directly opposite the scale line 52 of the swing seat 5, so that the rotation angle of the swing seat 5 can be displayed intuitively.

[0054] Specifically, the spatial mover 6 includes a lifter 61, a near-far rack 62, and an adjusting gear 63. The near-far rack 62 is mounted on the output component of the lifter 61 and is horizontally slidably connected to the output component of the lifter 61. The microscope is mounted on the output end of the near-far rack 62. The adjusting gear 63 is rotatably connected to the output component of the lifter 61 and meshes with the near-far rack 62. The length direction of the near-far rack 62 is parallel to the Y-axis. An adjusting knob 631 is fixed on the adjusting gear 63. Turning the adjusting knob 631 can drive the near-far rack 62 to move along the Y-axis, thereby moving the microscope closer to or away from the ball screw being measured.

[0055] In this embodiment, after the ball screw under test is clamped in place, when it is necessary to obtain the tooth profile of the ball screw under test, it is only necessary to rotate the worm gear 8 to adjust the angle of the swing seat 5 relative to the support seat 4, so that the microscope can capture the tooth profile of the ball screw under test without obstruction. Then, the rotation angle of the swing seat 5 relative to the support seat 4 is locked by the first locking structure. The normal tooth profile section can be obtained from the captured image data. By controlling the support seat 4 to move along the X-axis, normal tooth profile image data at different positions along the X-axis can be obtained. This embodiment facilitates the transmission of image data to the image processor, and the image processor can accurately measure key tooth profile parameters such as tooth angle, tooth height, and tooth root arc, avoiding errors and friction damage caused by contact measurement.

[0056] During pitch measurement, the microscope moves along the X-axis to acquire image data along the length of the lead screw. The pitch data is then calculated based on the total length and number of teeth analyzed by the image processor. The detection method is also very simple and convenient.

[0057] This embodiment uses a non-contact image data acquisition method to adapt to the testing needs of ball screws of different specifications, thereby improving the versatility of the solution and reducing the cost of use.

[0058] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A ball screw testing device, comprising a clamping module and a testing module mounted on a frame, the clamping module comprising a worktable, a fixed center mounted on the worktable, and a movable center, characterized in that: The detection module includes a support base, a swing base, a spatial mover, and an image acquisition unit installed at the output end of the spatial mover. The support base is slidably connected to the frame along the workpiece axis. The spatial mover is installed on the swing base, which is rotatably connected to the support base via a support positioning pin. The support positioning pin is horizontally set and perpendicular to the sliding direction of the support base. The swing base and the support base are locked together by a first locking structure to lock the swing base, which has completed its angular rotation, onto the support base. The spatial mover is used to drive the image acquisition unit to move up and down and horizontally. The image acquisition unit is used to acquire image data of the ball screw.

2. The ball screw testing device according to claim 1, characterized in that: The first locking structure includes an arc-shaped adjustment hole and at least two mounting holes. One of the arc-shaped adjustment hole and the mounting hole is located on the swing seat, and the other is located on the support seat. The mounting hole is directly opposite the arc-shaped adjustment hole, and the center of the arc-shaped adjustment hole is coaxial with the rotation center of the support positioning pin.

3. The ball screw testing device according to claim 2, characterized in that: A worm gear is rotatably connected to the support base, and a sector-shaped worm wheel is fixed on the swing base. The sector-shaped worm wheel meshes with the worm gear, and the center line of the sector-shaped worm gear is coaxial with the center line of the support positioning pin.

4. The ball screw testing device according to claim 2, characterized in that: The swing seat is provided with scale lines, and the support seat is provided with indicator lines that are directly opposite the scale lines of the swing seat.

5. The ball screw testing device according to claim 2, characterized in that: The arc-shaped adjustment hole is a stepped hole, and the arc-shaped adjustment hole is set on the swing seat.

6. A ball screw testing device according to any one of claims 1-5, characterized in that: The fixed center is equipped with a rotary driver, which drives the fixed center to rotate. A chuck is detachably connected to the fixed center. The chuck has a positioning through hole and a locking pin at the bottom of the positioning through hole. The outer periphery of the ball screw being tested, which faces the positioning through hole, has a flat surface. The locking pin is used to press against the flat surface of the ball screw being tested.

7. A ball screw testing device according to claim 6, characterized in that: The positioning through hole includes an arc segment and a V-shaped segment. The flared opening of the V-shaped segment is tangent to the arc segment, and the locking pin is threadedly connected to the bottom of the arc segment.

8. A ball screw testing device according to claim 6, characterized in that: The positioning through hole has an arc segment, and the top of the arc segment is machined with a horizontal surface parallel to the plane of the workpiece.

9. A ball screw testing device according to any one of claims 1-5 and 7-8, characterized in that: The worktable is rotatably connected to the frame, and the rotation center line of the worktable is a vertical line. A second locking structure is provided between the worktable and the frame. The second locking structure is used to lock the rotation angle after the worktable rotates relative to the frame.

10. A ball screw testing device according to claim 9, characterized in that: A scale plate is fixed on the worktable, and a pointer corresponding to the scale plate is provided on the frame. An adjusting rod is also threaded onto the frame. The adjusting rod is used to press against the side of the worktable away from the center of rotation. A dial gauge is also installed on the frame. The probe of the dial gauge is used to contact the side of the worktable.

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