A high-precision rack thread detection device

Abstract

The application discloses a high-precision rack thread detection device and belongs to the technical field of rack laser detection. The device comprises a detection table with a foot cup, a linear driving mechanism is slidably connected to the detection table, a positioning rack for positioning a rack to be detected is arranged on one side of the linear driving mechanism, a standard rack with the same size as the rack to be detected is arranged in the groove of the positioning rack through bolts, a movable laser detection mechanism is arranged on the linear driving mechanism, the laser detection mechanism comprises a light following assembly, a light scanning assembly and a laser generating assembly. Through the application, the wave line moving mode is realized, laser is inserted into the notch of every two adjacent tooth pieces, constant distance detection is carried out, the blind area and errors are eliminated, the measurement accuracy and reliability are effectively improved, the complete parameters of the notch are obtained at one time through the combination of horizontal reciprocating scanning, multiple supplementary scanning is avoided, the detection time is greatly shortened compared with the existing structure, and the detection integrity and efficiency are considered.

Description

Technical Field

[0001] This invention relates to laser measuring instruments, specifically to the technical field of rack laser detection, and more specifically to a high-precision rack thread detection device. Background Technology

[0002] Rack and pinion thread inspection is a specialized technical method in the mechanical manufacturing field for testing the geometric accuracy and fit performance of rack and pinion components with specific structure and thread characteristics. The inspection targets include core parameters of the rack such as tooth pitch, tooth profile accuracy, tooth direction tolerance, and tooth surface roughness, as well as key indicators of the thread such as pitch, thread angle, pitch diameter, minor diameter, and cumulative pitch error. Inspection methods can be divided into manual inspection (using tools such as tooth thickness calipers, thread gauges, and pitch meters) and precision instrument inspection (such as coordinate measuring machines, gear measuring centers, and thread measuring instruments). The core purpose is to verify whether the component dimensions and geometric tolerances meet design standards, ensuring the smoothness, accuracy, and service life of the rack and pinion during meshing, threaded connection, or transmission. It is widely used in equipment manufacturing scenarios that rely on precision transmission, such as machine tools, automated equipment, and automotive transmission systems.

[0003] Currently available high-precision rack laser inspection devices typically include a mechanical support positioning system, a laser measurement system, a displacement detection system, a control system, and a data processing system. The mechanical support system provides a high-rigidity installation reference and a precision worktable to ensure the rack is securely fixed. The laser measurement system uses a laser emitter and receiver as its core, along with optical elements to form a detection optical path. The displacement detection system uses a grating ruler and a servo motor to control the precise movement of the laser module. Under the coordination of the control unit, each system completes data acquisition and 3D modeling.

[0004] However, when using this detection method, because the laser detection module moves linearly outside the rack being tested, it sometimes creates a measurement blind zone in the tooth groove area. The bottom and sides of the tooth groove are prone to sparse or even missing point cloud data due to occlusion or reflection angle issues, making it impossible to accurately capture the tooth groove width and depth parameters. Moreover, it can only acquire some features of the tooth tip and tooth surface, and cannot effectively detect key parameters such as tooth groove roughness and tooth root fillet, requiring multiple rescans, resulting in low detection efficiency. Currently, in the patent application with application number 202311443554.4, this problem is mainly addressed by using the cooperation of a moving block and a spring to continuously push the rangefinder closer to each tooth groove. However, this method of driving the rangefinder to move back and forth by squeezing is prone to causing the rangefinder to vibrate, which in turn affects the detection data and reduces the reliability of the data. In addition, there will be jamming during use, and the part in contact with the tooth groove will also be blocked and cannot be detected. Summary of the Invention

[0005] This invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different approach. The invention, a laser detection device for racks, falls under the category of laser measuring instruments and primarily offers a high-precision rack thread detection device. This addresses the technical problem mentioned in the background section where existing high-precision rack laser detection devices typically involve linear movement of the laser detection module outside the rack under test, easily creating a measurement blind zone in the tooth groove area and resulting in the inability to accurately capture parameters such as tooth groove width and depth.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] A high-precision rack thread inspection device includes an inspection platform with feet, a linear drive mechanism slidably connected to the inspection platform, and a positioning frame for positioning the rack to be tested is provided near the linear drive mechanism. A standard rack of the same size as the rack to be tested is installed in the groove of the positioning frame by bolts. A movable laser inspection mechanism is provided on the linear drive mechanism. The laser inspection mechanism includes a light following component, a light scanning component, and a laser generating component. The laser generating component is located on the light scanning component and can drive the laser generating component to perform horizontal reverse deflection scanning. The light following component includes a mounting frame with two mounting holes. Each mounting hole has a rotating shaft. A standard gear and a turntable are respectively mounted on the two rotating shafts. The standard gear and the standard rack are meshed together. A connecting frame is hinged to the turntable. The connecting frame drives the laser generating component to move back and forth through a shaft. At the same time, the connecting frame and the linear drive mechanism work together. Through the superposition of the back-and-forth movement and the linear motion provided by the linear drive mechanism, the laser generating component moves along the contour of the rack teeth in a wave-shaped trajectory.

[0008] Preferably, the mounting bracket is bolted to an adjustable speed-increasing gearbox, which is located between two rotating shafts. The rotating shaft with a standard gear is connected to the input end of the speed-increasing gearbox via a pulley and a belt, while the rotating shaft with a turntable is connected to the output end of the speed-increasing gearbox via a pulley and a belt.

[0009] Preferably, each of the rotating shafts has a pressure cap threaded to its upper end, and the pressure cap presses against the upper side of the corresponding standard gear or turntable.

[0010] Preferably, a bearing is provided in the gap between each of the rotating shafts and the corresponding mounting holes.

[0011] Preferably, the light scanning assembly includes a support frame, a movable block, and a connecting block. The support frame is provided with a limiting port, within which the movable block slides. The connecting block is connected to the lower side of the movable block by bolts. An interface on the connecting block is connected to a shaft on the upper side of the connecting frame. A steering gear is provided on the connecting block, which meshes with a steering rack. A steering shaft is provided on the steering gear, with its upper end passing through a circular hole on the movable block. A connecting seat is threaded onto the upper end of the steering shaft.

[0012] Preferably, the lower side of the support frame is bolted to a mounting block, and the mounting block is bolted to the back of the steering rack.

[0013] Preferably, the laser generating assembly includes a rotating plate, which is connected to the connecting seat by bolts. An adjusting block is slidably connected to the opening on the rotating plate, and a laser generating detection module is provided on the adjusting block.

[0014] Preferably, an adjusting threaded post is provided at the opening on the rotating plate, and the adjusting threaded post and the adjusting block are connected by a thread.

[0015] Preferably, the linear drive mechanism includes a movable base, which is slidably connected to the detection table. The movable base is provided with two side frames, and a lead screw is provided on both side frames. A nut seat is provided on the lead screw, and the nut seat is connected to the mounting frame by bolts.

[0016] Preferably, the movable base is further provided with a motor, and the output end of the motor is connected to one end of the lead screw.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] (1) The present invention, through the setting of a detection platform, a moving seat, a side frame, a lead screw, a nut seat, a motor, a positioning frame, a rack to be tested, a standard rack, a mounting frame, a rotating shaft, a speed-increasing gearbox, a standard gear, a turntable, a pressure cover, a connecting frame, a pulley and a belt, realizes that the laser generation detection module can follow the contour of the rack to be tested to make a wavy line movement trajectory, which allows the detection light source to naturally penetrate into the recess between each adjacent rack to cover the recess area without dead angles. This solves the technical problem in the existing structure that when the laser module moves in a straight line along the length of the rack, the recess area between the racks is prone to forming a detection blind zone due to the deviation or obstruction of the laser beam incident angle, resulting in the inability to accurately obtain key parameters such as the depth and width of the recess;

[0019] Meanwhile, the interaction between the detection stage, the moving base, the adjusting block, and the adjusting threaded column allows for pre-adjustment of the distance between the laser generation detection module and the rack under test. This ensures that the distance between the detection light source and the tooth surface remains constant during the wavy line movement. On the one hand, this avoids the light intensity instability and cosine error caused by distance fluctuations in traditional linear movement, making the measurement data closer to the true geometric dimensions of the gear. On the other hand, the close-range detection mode significantly reduces the interference of stray light and dust in the external environment on the laser signal, reduces outliers in the data acquisition process, and improves the repeatability and reliability of the measurement results. Furthermore, the light source of the laser generation detection module can cover the tooth tip, tooth surface, and tooth root areas in one go with the wavy line movement trajectory, eliminating the need for multiple scanning paths to different parts as required by existing structures, effectively simplifying the detection process.

[0020] (2) By setting up a linear drive mechanism, a light following component, a support frame, a limiting port, a moving block, a connecting block, a steering gear, a steering shaft, a connecting seat, a mounting block, and a steering rack, this invention realizes that during the process of the laser detection module probing into the adjacent toothed recess with the wavy line trajectory, the light source of the laser detection module will simultaneously complete a horizontal reciprocating deflection scan, so that the laser beam fully covers the two sides and bottom contour of the recess, and obtains the complete recess width, depth, tooth angle and other key parameters at one time. This effectively avoids the trouble of multiple rescans, improves detection efficiency, and solves the technical problem in the existing structure that the measurement of the toothed recess requires multiple adjustments of the laser module angle or moving path to collect data from the two sides of the recess separately. This is not only cumbersome to operate, but also prone to parameter calculation errors due to the reference deviation of multiple measurements.

[0021] Meanwhile, horizontal scanning can accurately capture subtle features such as tooth root fillets and concave transition surfaces, solving the problem of insufficient measurement of such details in existing structures, greatly improving the continuity and efficiency of the inspection process, and is particularly suitable for rapid quality inspection of batch high-precision racks.

[0022] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is an exploded view of the overall structure of the present invention;

[0025] Figure 3 This is an exploded view of the linear drive mechanism of the present invention;

[0026] Figure 4 This is a schematic diagram of the light-following component structure of the present invention;

[0027] Figure 5 This is an exploded view of the light-following component of the present invention;

[0028] Figure 6 This is a schematic diagram of the connection between the rotating shaft and the pressure cap of the present invention;

[0029] Figure 7 This is a schematic diagram of the structure of the light scanning component of the present invention;

[0030] Figure 8 This is an exploded view of the light scanning component of the present invention;

[0031] Figure 9 This is a schematic diagram showing the connection of the steering gear, steering shaft, and connecting seat of the present invention;

[0032] Figure 10 This is a schematic diagram of the connection between the steering rack and the mounting block of the present invention;

[0033] Figure 11 This is an exploded view of the laser generating component of the present invention.

[0034] In the diagram: 1. Testing platform; 2. Linear drive mechanism; 21. Moving seat; 22. Side frame; 23. Lead screw; 231. Nut seat; 24. Motor; 3. Positioning frame; 31. Rack to be tested; 32. Standard rack; 4. Light following assembly; 41. Mounting frame; 411. Mounting hole; 42. Rotating shaft; 43. Speed-up gearbox; 44. Standard gear; 45. Turntable; 46. Pressure cover; 47. Connecting frame; 48. Bearing; 5. Light scanning assembly; 51. Support frame; 52. Limit port; 53. Moving block; 54. Connecting block; 55. Steering gear; 551. Steering shaft; 552. Connecting seat; 56. Mounting block; 57. Steering rack; 6. Laser generating assembly; 61. Rotating plate; 62. Adjusting block; 63. Laser generating detection module; 64. Adjusting threaded column. Detailed Implementation

[0035] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] For the implementation examples, please refer to the appendix. Figure 1-11 As shown, a high-precision rack thread inspection device includes an inspection platform 1 with a foot cup. A linear drive mechanism 2 is slidably connected to the inspection platform 1. A positioning frame 3 for positioning a rack 31 to be tested is provided near the linear drive mechanism 2. A standard rack 32 of the same size as the rack 31 to be tested is installed in the groove of the positioning frame 3 by bolts. A movable laser inspection mechanism is provided on the linear drive mechanism 2. The laser inspection mechanism includes a light following component 4, a light scanning component 5, and a laser generating component 6. The laser generating component 6 is located on the light scanning component 5, and the light scanning component 5 can drive the laser generating component 6 to deflect in the horizontal direction. The laser scanning component 4 includes a mounting frame 41 with two mounting holes 411. Each mounting hole 411 contains a rotating shaft 42, and the two rotating shafts 42 are respectively equipped with a standard gear 44 and a turntable 45. The standard gear 44 and the standard rack 32 are meshed together. A connecting frame 47 is hinged to the turntable 45. The connecting frame 47 drives the laser generating component 6 to move back and forth through a shaft. At the same time, the connecting frame 47 works in conjunction with the linear drive mechanism 2. Through the superposition of the back and forth movement and the linear motion provided by the linear drive mechanism 2, the laser generating component 6 is driven to move along the contour of the teeth in the rack in a wave-shaped trajectory.

[0039] Please refer to the appendix carefully. Figure 2-6 As shown, the linear drive mechanism 2 includes a movable base 21, which is slidably connected to the detection table 1. The movable base 21 is provided with two side frames 22, and a lead screw 23 is provided on both side frames 22. A nut seat 231 is provided on the lead screw 23, and the nut seat 231 is connected to the mounting bracket 41 by bolts. The movable base 21 is also provided with a motor 24, and the output end of the motor 24 is connected to one end of the lead screw 23. Through the cooperation between the motor 24, the lead screw 23 and the nut seat 231, the linear movement of the laser generation detection module 63 is provided.

[0040] The mounting bracket 41 is bolted to an adjustable speed-lift gearbox 43, which is located between two rotating shafts 42. The rotating shaft 42 with a standard gear 44 is connected to the input end of the speed-lift gearbox 43 via a pulley and belt, while the rotating shaft 42 with a turntable 45 is connected to the output end of the speed-lift gearbox 43 via a pulley and belt. Through the speed-lift gearbox 43, the rotational speed of the turntable 45 can be adjusted according to the rotational speed of the standard gear 44. The upper end of each rotating shaft 42 is threaded... A pressure cap 46 is attached, and the pressure cap 46 presses on the upper side of the corresponding standard gear 44 or turntable 45. Through the cooperation between the rotating shaft 42 and the pressure cap 46, it is possible to easily disassemble and replace standard gears 44 or turntables 45 of different specifications. The pressure cap 46 can limit the movement and prevent the standard gear 44 or turntable 45 from disengaging from the rotating shaft 42 during rotation. A bearing 48 is provided in the gap between each rotating shaft 42 and the corresponding mounting hole 411, which improves the stability of the rotating shaft 42 on the mounting bracket 41.

[0041] Please refer to the appendix carefully. Figure 7-11 As shown, the light scanning assembly 5 includes a support frame 51, a moving block 53, and a connecting block 54. The support frame 51 has a limiting port 52, within which the moving block 53 slides. The connecting block 54 is bolted to the lower side of the moving block 53. An interface on the connecting block 54 is connected to a shaft on the upper side of the connecting frame 47. A steering gear 55 is mounted on the connecting block 54, meshing with a steering rack 57. A steering shaft 551 is mounted on the steering gear 55, with its upper end passing through a circular hole in the moving block 53. A connecting seat 552 is threaded onto the upper end of the steering shaft 551. A mounting block 56 is bolted to the lower side of the support frame 51, and the mounting block 56 is bolted to the back of the steering rack 57. The support frame 51, along with the moving block 53 and connecting block 54, allows for seamless connection between the support frame 51 and the moving block 53. The cooperation between the connecting block 54, the steering gear 55, the steering shaft 551, the connecting seat 552, and the steering rack 57 provides driving force for the deflection scanning of the laser generation detection module 63. The laser generation assembly 6 includes a rotating plate 61, which is connected to the connecting seat 552 by bolts. An adjusting block 62 is slidably connected to the opening on the rotating plate 61. The laser generation detection module 63 is mounted on the adjusting block 62 to detect the rack 31 to be tested. An adjusting threaded post 64 is provided at the opening on the rotating plate 61. The adjusting threaded post 64 and the adjusting block 62 are threadedly connected. Through the cooperation between the adjusting threaded post 64 and the adjusting block 62, the initial distance between the laser generation detection module 63 and the rack 31 to be tested can be adjusted.

[0042] The above structure enables the laser to probe into the notch of each pair of adjacent gears in a wavy line motion for constant distance detection, eliminating blind spots and errors, effectively improving measurement accuracy and reliability. Furthermore, combined with horizontal reciprocating scanning, it can acquire complete notch parameters in one go, avoiding multiple rescans. Compared with existing structures, it significantly shortens the detection time, balancing detection completeness and efficiency, and is suitable for high-precision rack detection requirements.

[0043] The specific operation is as follows: First, using a screw, place the rack to be tested 31 and the standard rack 32 into the two grooves on the positioning frame 3. The rack to be tested 31 is in the upper groove, and the standard rack 32 is in the lower groove. After positioning, the two racks are in the same vertical plane and parallel to each other (the rack to be tested 31 and the standard rack 32 are of the same specification). Then, place the standard gear 44 of the corresponding specification that can mate with the standard rack 32 on the rotating shaft 42 near the positioning frame 3, and tighten it with the pressure cap 46, which presses against the standard gear 44. Similarly, place the turntable 45 of the corresponding specification on another rotating shaft 42 and limit its position with the pressure cap 46. Then, adjust the speed-increasing gear according to the specification of the rack to be tested 31. The gearbox 43 allows the turntable 45 to rotate once for every standard distance the standard gear advances on the standard rack 32 (defined as the distance between the centerlines of two adjacent teeth on the standard rack 32, i.e., half the width of a tooth + half the width of a tooth + the sum of the width of the notch between two adjacent teeth). The connecting frame 47 pulls the moving block 53 to reciprocate once within the limit port 52, and then pushes the moving seat 21 on the detection table 1, so that the laser generating detection module 63 in the mobile laser detection mechanism approaches the rack 31 to be tested. Then, the adjusting threaded column 64 is rotated, and the adjusting block 62 drives the laser generating detection module 63 to slide along the limit port 52, further adjusting the distance to the rack 31 to be tested, avoiding interference during the movement.

[0044] The wavy trajectory of the laser generation detection module 63 activates the motor 24, which drives the lead screw 23 to rotate. The nut seat 231 on the lead screw 23 then moves the movable laser detection mechanism linearly along the length direction (referred to as the Y-axis) of the rack 31 to be tested. Simultaneously, it pulls the standard gear 44 to rotate on the standard rack 32. The standard gear 44 does not contact the rack 31 to be tested, unlike traditional structures that obstruct the notches between the teeth, creating a blind spot. As the standard gear 44 rotates, the shaft 42 on it rotates synchronously and connects to the input end of the speed-increasing gearbox 43 via pulleys and belts. The output end of the speed-increasing gearbox 43 then rotates, using another set of pulleys and belts to drive the shaft 42 on the turntable 45 to rotate. Due to the rotation of the turntable 45, one end of the connecting frame 47, which is hinged to the eccentric position of the turntable 45, performs a circular motion, while the other end... It is connected to the moving block 53 through the connecting block 54. The moving block 53 is constrained by the limiting port 52, so it moves back and forth linearly within the limiting port 52 (which can be recorded as the X-axis direction). (The laser generation detection module 63 is installed on the connecting seat 552 of the moving block 53). The standard gear 44 moves along the length of the standard rack 32 by a standard distance. Every time the turntable 45 rotates once, the connecting frame 47 on the turntable will pull the laser generation detection module 63 on the moving block 53 to move back and forth once. Under the superposition and cooperation of the two directions (X-axis and Y-axis), the light source movement trajectory of the laser generation detection module 63 is in the form of a wave line, so as to follow the tooth contour of the rack 31 to be tested. This allows the detection light source to penetrate into the notch of each tooth, and the distance remains the same each time, so as to perform close-range detection and reduce the interference of external light or dust.

[0045] The laser generation and detection module 63 deflects back and forth in the horizontal direction. During each reciprocating movement of the moving block 53, firstly, when the moving block 53 drives the laser generation and detection module 63 to approach the tooth recess of the rack 31 to be tested, the steering gear 55 on the moving block 53 will first approach the steering rack 57 on the support frame 51, and then make contact (that is, the laser generation and detection module 63 first moves in a straight line along the limit port 52 to approach, and when the light source end of the laser generation and detection module 63 just enters the adjacent tooth recess, the steering gear 55 contacts the steering rack 57, and then the laser generation and detection module 63 begins to deflect in the forward direction, which can prevent the light source end from interfering with the teeth of the rack 31 to be tested). This causes the steering gear 55 to rotate in the forward direction, and the steering gear 55 drives the steering shaft 551 to rotate in the forward direction synchronously. Since the laser generation component 6 is mounted on the steering shaft 551 through the connecting seat 552, At the upper end, the steering shaft 551 drives the laser generating component 6 to deflect in the horizontal direction. Secondly, when the moving block 53 drives the laser generating detection module 63 away from the tooth recess of the rack 31 to be tested, due to the action of the steering rack 57, the steering gear 55 drives the laser generating detection module 63 to deflect in the reverse direction through the steering shaft 551. That is, each time it enters the tooth recess of the rack 31 to be tested, a forward and reverse horizontal scan can be completed. This allows the laser beam on the laser generating detection module 63 to better capture the two sides of the recess of the adjacent tooth, so as to obtain the complete recess width, depth and angle parameters at one time. This avoids the problem of traditional straight line scanning requiring multiple adjustments to measure the recess between the teeth. With the movement of the wavy line trajectory, the laser generating detection module 63 continuously repeats the above actions until it moves to the end of the rack 31 to be tested, thus completing the detection.

[0046] The present invention has been described by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A high-precision rack thread detection device, comprising a detection table (1) with a foot cup, a linear driving mechanism (2) is slidably connected on the detection table (1), and a positioning rack (3) for positioning a rack to be detected (31) is arranged on one side close to the linear driving mechanism (2), characterized in that The positioning frame (3) is provided with a standard rack (32) with the same size as the rack (31) to be measured, which is installed in the groove of the positioning frame (3) through bolts, and the linear driving mechanism (2) is provided with a movable laser detection mechanism, which comprises a light following assembly (4), a light scanning assembly (5) and a laser generating assembly (6), the laser generating assembly (6) is located on the light scanning assembly (5), and the light scanning assembly (5) can drive the laser generating assembly (6) to deflect and scan in the horizontal direction, the light following assembly (4) comprises a mounting frame (41), two mounting holes (411) are formed in the mounting frame (41), a rotating shaft (42) is arranged in each mounting hole (411), a standard gear (44) and a rotating disc (45) are arranged on the two rotating shafts (42) respectively, the standard gear (44) is in meshing connection with the standard rack (32), and the rotating disc (45) is hingedly connected with a connecting frame (47), the connecting frame (47) drives the laser generating assembly (6) to move back and forth through a shaft rod, and meanwhile, the connecting frame (47) cooperates with the linear driving mechanism (2) to drive the laser generating assembly (6) to move in a wave-shaped track along the profile of the rack gear through the superposition of the linear motion of the linear driving mechanism (2) and the back-and-forth movement of the connecting frame (47); The light scanning assembly (5) comprises a supporting frame (51), a moving block (53) and a connecting block (54), the supporting frame (51) is provided with a limiting opening (52), the moving block (53) slides in the limiting opening (52), the connecting block (54) is connected to the lower side of the moving block (53) through bolts, an interface on the connecting block (54) is connected with a shaft rod on the upper side of the connecting frame (47), the connecting block (54) is provided with a steering gear (55), the steering gear (55) is in meshing connection with a steering rack (57), the steering gear (55) is provided with a steering shaft (551), the upper end of the steering shaft (551) penetrates through a circular hole in the moving block (53), the upper end of the steering shaft (551) is threadedly connected with a connecting seat (552), the lower side of the supporting frame (51) is connected with a mounting block (56) through bolts, and the mounting block (56) is connected to the back surface of the steering rack (57) through bolts, and the cooperation between the moving block (53), the connecting block (54), the steering gear (55), the steering shaft (551), the connecting seat (552) and the steering rack (57) provides driving force for the deflection scanning of the laser generating detection module (63). The standard gear (44) is on the standard rack (32) every standard distance, the rotating disc (45) can rotate a circle, the connecting frame (47) pulls the moving block (53) to move in the limiting port (52) once, in the process of moving block (53) reciprocating every time, when the moving block (53) drives the laser generating detection module (63) to approach the tooth gap recess of the rack (31), the steering gear (55) on the moving block (53) will first approach the steering gear rack (57) on the support frame (51), then contact and cooperate, so that the steering gear (55) rotates forward, drives the steering gear (55) to rotate forward synchronously.

2. The high-precision rack thread inspection device of claim 1, wherein, The mounting frame (41) is connected with the adjustable speed gearbox (43) by bolts, the speed gearbox (43) is located between the two rotating shafts (42), and the rotating shaft (42) with the standard gear (44) is connected with the input end of the speed gearbox (43) through the belt pulley and the belt, and the rotating shaft (42) with the rotating disc (45) is connected with the output end of the speed gearbox (43) through the belt pulley and the belt.

3. The high-precision rack thread inspection device of claim 2, wherein, The upper end of each rotating shaft (42) is threadedly connected with a gland (46), and the gland (46) is pressed on the upper side of the corresponding standard gear (44) or rotating disc (45).

4. The high-precision rack thread inspection device of claim 1, wherein, The gap between each rotating shaft (42) and the corresponding mounting hole (411) is provided with a bearing (48).

5. The high-precision rack thread inspection device of claim 1, wherein, The laser generating assembly (6) comprises a rotating plate (61), the rotating plate (61) and the adapter seat (552) are connected by bolts, the opening of the rotating plate (61) is slidably connected with an adjusting block (62), and the adjusting block (62) is provided with a laser generating detection module (63).

6. The high-precision rack thread inspection device of claim 5, wherein, The opening of the rotating plate (61) is provided with an adjusting threaded column (64), and the adjusting threaded column (64) and the adjusting block (62) are threadedly connected.

7. The high-precision rack thread inspection device of claim 1, wherein, The linear drive mechanism (2) comprises a moving seat (21), and the moving seat (21) and the detection table (1) are slidably connected, the moving seat (21) is provided with two side frames (22), and the two side frames (22) are commonly provided with a lead screw (23), the lead screw (23) is provided with a nut seat (231), and the nut seat (231) and the mounting frame (41) are connected by bolts.

8. The high-precision rack thread inspection device of claim 7, wherein, The moving seat (21) is further provided with a motor (24), and the output end of the motor (24) is connected with one end of the lead screw (23).

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