A detection device for a ball screw

Abstract

This application relates to the field of lead screw and nut inspection, and in particular to an inspection device for lead screw and nut, comprising a base, a feed nut, a feed lead screw, a mounting sleeve, and an inspection piece. The base has a fixing port that extends horizontally through the base. The feed nut is coaxially fixed to the inner wall of the fixing port, and the feed lead screw is threaded to the inner wall of the feed nut. The mounting sleeve is coaxially fixed to one end of the feed lead screw. The end of the mounting sleeve opposite to the feed lead screw has a coaxial mounting port for fixing the lead screw and nut. The feed nut is a standard lead screw and nut. The inspection piece is located on the side of the mounting sleeve away from the base and is used to inspect the grooves of the lead screw and nut. This device transforms complex spatial helical motion into simple rotary input, overcoming the path control problem in detecting the helical grooves within the lead screw and nut. While ensuring high precision and high consistency, it also features low cost and high reliability, demonstrating significant practical value and improving inspection quality.

Description

Technical Field

[0001] This application relates to the field of lead screw and nut testing, and more particularly to a testing device for lead screw and nut. Background Technology

[0002] As the core component of a ball screw assembly, the machining quality of its internal helical groove directly determines the transmission accuracy, operational smoothness, noise level, and service life of the assembly. This helical groove serves as the rolling track for the balls, and its geometric accuracy (such as groove profile, radius of curvature, and contact angle) and surface quality (such as surface roughness, presence of cracks, scratches, grinding burns, and other defects) must be strictly controlled within the design tolerances.

[0003] Currently, manual inspection is still widely used, especially in small and medium-sized enterprises, for quality inspection of lead screw and nut grooves. Operators typically use industrial endoscopes or simple optical probes to insert into the nut and judge the presence of defects on the groove surface based on their experience and the image on the display screen. However, because the internal groove of the lead screw and nut is a spatial spiral, it is impossible for a human hand to precisely guide the probe to follow an invisible spiral. This inevitably causes the probe to deviate from the groove in certain sections, or even wander into non-working tooth crest areas, thus completely missing defects in those sections and reducing the quality of the inspection. Utility Model Content

[0004] To improve the quality of testing, this application provides a testing device for lead screw nuts.

[0005] The detection device for lead screw nuts provided in this application adopts the following technical solution: A detection device for lead screw nuts includes a base, a feed nut, a feed lead screw, a mounting sleeve, and a detection component. The base has a fixing port that extends horizontally through the base. The feed nut is coaxially fixed to the inner wall of the fixing port. The feed lead screw is threaded to the inner wall of the feed nut. The mounting sleeve is coaxially fixed to one end of the feed lead screw. The end of the mounting sleeve opposite to the feed lead screw has a coaxial mounting port for fixing the lead screw nut. The feed nut is a standard lead screw nut. The detection component is located on the side of the mounting sleeve away from the base and is used to detect the groove of the lead screw nut.

[0006] By adopting the above technical solution, the complex spatial helical motion is transformed into a simple rotary input, fundamentally overcoming the path control problem in the detection of the helical groove inside the lead screw nut. While ensuring high precision and high consistency, it also features low cost and high reliability, has significant practical value, and improves the detection quality.

[0007] Preferably, it also includes a frame and a linear guide rod, the linear guide rod being fixedly connected to the frame by a fixing plate, the axis of the linear guide rod being parallel to the axis of the fixing port, the base being provided with a guide port, and the linear guide rod being slidably connected to the inner wall of the guide port.

[0008] By adopting the above technical solution, the radial runout and wobble of the base and the workpiece being measured that may be caused by the rotation of the feed screw are eliminated. This ensures that the mounting sleeve and the screw nut on it maintain extremely high straightness and motion stability during axial movement, thereby providing a stable and coaxial testing environment for the test piece. This completely avoids measurement errors caused by deviations in the workpiece's movement trajectory and improves the testing quality.

[0009] Preferably, it also includes a handle, which is fixedly connected to the base and is used by the operator to hold and move the base.

[0010] By adopting the above technical solution, the handle provides the operator with an ergonomic grip point, making the movement, positioning, and initial alignment of the entire testing device with the lead screw nut to be tested convenient, labor-saving, and stable. It effectively avoids the problems of hand slippage, bumps, or inaccurate positioning that may occur if the base is moved directly, and significantly improves the operational efficiency and safety of the testing process.

[0011] Preferably, it also includes a front limiting member, which is located on the side of the base near the detection member. The front limiting member is connected to the outer wall of the linear guide rail and is used for the base to abut against it.

[0012] By adopting the above technical solution, the front limit component provides a precise and reliable mechanical hard limit for the movement stroke of the base. When the base moves along the linear guide rail and abuts against the front limit component, it can ensure that the measured lead screw nut on the mounting sleeve and the fixed detection part quickly, accurately and repeatedly reach the preset axial detection starting position, effectively avoiding random errors in manual positioning and greatly improving the consistency and efficiency of workpiece positioning during batch testing.

[0013] Preferably, the front limiting member includes a limiting ring and a screw. The limiting ring has a tightening port, through which the linear guide rod passes. The outer wall of the limiting ring has a notch that communicates with the tightening port. The inner wall of the notch has a first locking port and a second locking port. Both the first locking port and the second locking port are located on the outer periphery of the tightening port. Both the first locking port and the second locking port penetrate the limiting ring axially. The screw passes through the first locking port and is threaded into the second locking port.

[0014] By adopting the above technical solution, rapid, flexible positioning and secure locking of the linear guide rod at any position in the axial direction are achieved. The operator can tighten the screw to make the limiting ring tightly hug the linear guide rod to form a rigid limit by utilizing the elastic deformation of the notch structure. The axial position can be easily adjusted by loosening the screw. Thus, the moving end point of the base can be accurately defined according to the detection requirements of different specifications of lead screw nuts, which greatly improves the adaptability of the equipment to different workpieces and the consistency of the detection start position.

[0015] Preferably, it also includes a rear limiting member, which is located on the side of the base away from the mounting sleeve, and the rear limiting member is connected to the outer wall of the feed screw.

[0016] By adopting the above technical solution, the rear limiter provides a precise and adjustable axial termination point for the return movement of the base, which together with the front limiter constitutes a complete stroke control range. When the base abuts the rear limiter, it indicates that the detection component has reached the detection endpoint and the detection is completed.

[0017] Preferably, the rear limiting member is a rear limit nut, which is threaded to the outer wall of the feed screw, and the diameter of the rear limit nut is larger than the diameter of the fixing port.

[0018] By adopting the above technical solution, when the base moves away from the mounting sleeve to a specific position, its rear end face will abut against the front end face of the rear limit nut. Since the diameter of the nut is larger than the diameter of the fixed hole, the movement of the base is immediately terminated. The limit position is infinitely adjustable within the entire length of the feed screw through the threaded connection, which can flexibly adapt to the detection stroke requirements of different product specifications.

[0019] Preferably, it also includes a fixing screw, the outer wall of the rear limit nut is provided with a limiting port, the fixing screw is threaded to the inner wall of the limiting port, and the fixing screw is used to abut against the outer wall of the feed screw.

[0020] By adopting the above technical solution, the fixing screw achieves precise positioning and rigid locking of the rear limit nut at any position on the feed screw. The operator can easily adjust the axial position of the rear limit nut on the feed screw to adapt to different detection stroke requirements by loosening the fixing screw. By tightening the fixing screw, the huge friction force generated between the screw end and the outer wall of the feed screw can be used to firmly lock it, effectively preventing the rear limit nut from accidentally loosening or shifting due to vibration or inertia during long-term operation of the equipment.

[0021] Preferably, it also includes a handwheel, which includes a rotating disk and a handle. The rotating disk is coaxially and fixedly connected to the end of the feed screw away from the mounting sleeve, and one end of the handle is fixedly connected to the edge of the rotating disk. The axis of the handle is parallel to the axis of the feed screw.

[0022] By adopting the above technical solution, an ergonomic force application point is provided for the operator, making the core operation of rotating the feed screw more labor-saving, precise and smooth.

[0023] Preferably, the detection component includes a fixed base, a detection pen, a controller, and a display screen. The detection pen is fixedly connected to the fixed base, one end of the detection pen is located inside a lead screw nut, and the detection pen is electrically connected to the display screen through the controller.

[0024] By adopting the above technical solution, the mounting base provides stable support for the testing pen, ensuring that its probe end is always accurately aligned with the groove of the lead screw nut during the testing process. The precision sensor built into the testing pen is responsible for collecting the microscopic morphology and macroscopic geometric data of the groove. The controller, as the data processing center, amplifies, filters, and digitally analyzes the raw signal, and finally displays the processed groove contour, surface defects, and key dimensional parameters on the display screen in real time. This allows operators to intuitively and quantitatively read the test results, thereby achieving accurate, efficient, and objective evaluation of the quality of the lead screw nut groove.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. By transforming complex spatial helical motion into simple rotary input, the path control problem in the detection of the helical groove inside the lead screw nut is fundamentally solved. While ensuring high precision and high consistency, it also features low cost and high reliability, which has significant practical value and improves the detection quality. 2. The front limit component provides a precise and reliable mechanical hard limit for the movement of the base. When the base moves along the linear guide and abuts against the front limit component, it can ensure that the measured lead screw nut on the mounting sleeve and the fixed detection part quickly, accurately and repeatedly reach the preset axial detection starting position, effectively avoiding random errors in manual positioning and greatly improving the consistency and efficiency of workpiece positioning during batch testing. 3. The fixing screw enables precise positioning and rigid locking of the rear limit nut at any position on the feed screw. Operators can easily adjust the axial position of the rear limit nut on the feed screw to adapt to different detection stroke requirements by loosening the fixing screw. By tightening the fixing screw, the huge friction force generated between the screw end and the outer wall of the feed screw can be used to firmly lock it, effectively preventing the rear limit nut from accidentally loosening or shifting due to vibration or inertia during long-term operation of the equipment. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a testing device for lead screw nuts.

[0027] Figure 2 This is a cross-sectional view of a device for detecting lead screw nuts.

[0028] Figure 3 This is a schematic diagram of the overall structure of the front limit component.

[0029] Figure 4 This is a schematic diagram of the overall structure of the feed screw, mounting sleeve, handwheel, and rear limit component.

[0030] Explanation of reference numerals in the attached drawings: 1. Frame; 11. Fixing frame; 111. Inspection port; 12. Upright plate; 2. Guide component; 21. Fixing plate; 22. Linear guide rod; 3. Moving component; 31. Base; 311. Guide port; 312. Fixing port; 313. Positioning strip; 314. Locking port; 32. Feed nut; 321. Positioning groove; 33. Feed screw; 34. Handle; 35. Mounting sleeve; 351. Mounting port; 36. 37. Pin; 371. Handwheel; 372. Rotary disc; 373. Handle; 4. Detector; 41. Fixing base; 42. Detector pen; 43. Controller; 44. Display screen; 5. Front limit component; 51. Limiting ring; 511. Tightening port; 512. Notch; 513. First locking port; 514. Second locking port; 52. Screw; 6. Rear limit component; 61. Rear limit nut; 611. Limiting port; 62. Fixing screw. Detailed Implementation

[0031] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0032] This application discloses a detection device for lead screw nuts. (Refer to...) Figure 1 A detection device for lead screw nuts includes a frame 1, a guide 2, a moving part 3, a detection part 4, a front limit part 5, and a rear limit part 6.

[0033] The frame 1 includes a fixed frame 11 and an upright plate 12. The upright plate 12 is fixedly connected to the upper end of the fixed frame 11. The upright plate 12 is located near the edge of the fixed frame 11. The length direction of the upright plate 12 is parallel to the length direction of the fixed frame 11. The upper end of the fixed frame 11 is provided with a detection port 111, which is located on one side of the upright plate 12.

[0034] Reference Figure 2 The guide member 2 is located inside the detection port 111. There are two guide members 2, which are located near the two ends of the fixed frame 11 in the width direction. The guide member 2 includes a fixed plate 21 and a linear guide rod 22. The fixed plate 21 is fixedly connected to the inner wall of the detection port 111. There are two fixed plates 21. The two ends of the linear guide rod 22 are fixedly connected to the fixed plate 21. The axis of the linear guide rod 22 is parallel to the length direction of the fixed frame 11.

[0035] Reference Figure 1 and Figure 2The moving part 3 includes a base 31, a feed nut 32, a feed screw 33, a handle 34, a mounting sleeve 35, a pin 36, and a handwheel 37. The base 31 has guide openings 311 at both ends, and a linear guide rod 22 is slidably connected to the inner wall of the guide opening 311. The length direction of the base 31 is parallel to the width direction of the fixed frame 11. The base 31 has a fixing port 312 located between two guide ports 311. The axis of the fixing port 312 is parallel to the axis of the linear guide rod 22. The fixing port 312 penetrates the base 31. A positioning strip 313 is fixedly connected to the inner wall of the fixing port 312. The outer wall of the feed nut 32 has a positioning groove 321, in which the positioning strip 313 is embedded. The upper end of the base 31 has a locking port 314. A fixing pin is threadedly connected to the inner wall of the locking port 314, and the end of the fixing pin abuts against the outer wall of the feed nut 32 to fix the feed nut 32. The feed screw 33 is threadedly connected to the inner wall of the feed nut 32. A handle 34 is located on the side of the fixing port 312 away from the vertical plate 12. The handle 34 is fixedly connected to the upper end of the base 31 and is used by the operator to hold and move the base 31.

[0036] Mounting sleeve 35 is coaxially fixedly connected to one end of feed screw 33. The end of mounting sleeve 35 opposite to feed screw 33 is coaxially provided with mounting port 351. Pins 36 are fixedly connected to the inner wall of mounting port 351. The mounting port 351 is used to fix the screw nut. There are three pins 36. The three pins 36 are evenly spaced around the axis of mounting port 351. The pins 36 are used to extend into the groove of the outer wall of the screw nut to limit the movement of the screw nut. The feed nut 32 is a standard screw nut.

[0037] Reference Figure 1 The handwheel 37 includes a rotating disk 371 and a handle 372. The rotating disk 371 is coaxially and fixedly connected to the end of the feed screw 33 away from the mounting sleeve 35. One end of the handle 372 is fixedly connected to the edge of the rotating disk 371. The axis of the handle 372 is parallel to the axis of the feed screw 33.

[0038] The detection element 4 is located on the side of the mounting sleeve 35 away from the base 31. The detection element 4 is used to detect the groove of the lead screw nut. The detection element 4 includes a fixed base 41, a detection pen 42, a controller 43, and a display screen 44. The fixed base 41 is fixedly connected to the upper end of the fixed frame 11, and the detection pen 42 is fixedly connected to the fixed base 41. One end of the detection pen 42 is located inside the lead screw nut. The display screen 44 is fixed to the upright plate 12 facing one end of the feed lead screw 33. The detection pen 42 is electrically connected to the display screen 44 through the controller 43. An endoscope probe is provided at the end of the detection pen 42.

[0039] Reference Figure 2 and Figure 3The front limiting member 5 is located on the side of the base 31 near the detection member 4. The front limiting member 5 is connected to the outer wall of the linear guide rod 22 and is used for the base 31 to abut against it. The front limiting member 5 includes a limiting ring 51 and a screw 52. The limiting ring 51 has a tightening opening 511 through which the linear guide rod 22 passes. The outer wall of the limiting ring 51 has a notch 512 that connects to the tightening opening 511. The inner wall of the notch 512 has a first locking opening 513 and a second locking opening 514. The first locking opening 513 and the second locking opening 514 are both located on the outer periphery of the tightening opening 511. The first locking opening 513 and the second locking opening 514 both penetrate the limiting ring 51 along their own axial direction. The screw 52 passes through the first locking opening 513 and is threaded to the second locking opening 514.

[0040] Reference Figure 2 and Figure 4 The rear limiting member 6 is located on the side of the base 31 away from the mounting sleeve 35, and is connected to the outer wall of the feed screw 33. The rear limiting member 6 consists of a rear limit nut 61 and a fixing screw 62. The rear limit nut 61 is threaded to the outer wall of the feed screw 33, and the diameter of the rear limit nut 61 is larger than the diameter of the fixing port 312. The outer wall of the rear limit nut 61 has a limiting port 611, and the fixing screw 62 is threaded to the inner wall of the limiting port 611. The end of the fixing screw 62 is used to abut against the outer wall of the feed screw 33.

[0041] The implementation principle of the detection device for lead screw nuts in this application embodiment is as follows: The lead screw nut is installed into the mounting port 351, and the pin 36 limits the lead screw nut. The hand handle 37 is used to slide the base 31 so that the base 31 abuts against the limiting ring 51. At this time, one end of the detection pen 42 is located inside the lead screw nut. The operator holds the handle 372 and rotates the feed lead screw 33. The mounting sleeve 35 moves closer to the fixed seat 41, so that the detection pen 42 probes the groove of the lead screw nut. The display screen 44 displays the groove of the lead screw nut. The operator observes the display screen 44 with the naked eye to perform the detection, which will not miss any detections and improves the detection quality.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A detection device for a ball screw, characterized by: The device includes a base (31), a feed nut (32), a feed screw (33), a mounting sleeve (35), and a detection element (4). The base (31) has a fixing port (312) that extends horizontally through the base (31). The feed nut (32) is coaxially fixed to the inner wall of the fixing port (312). The feed screw (33) is threaded to the inner wall of the feed nut (32). The mounting sleeve (35) is coaxially fixed to one end of the feed screw (33). The end of the mounting sleeve (35) away from the feed screw (33) has a mounting port (351) coaxially. The mounting port (351) is used to fix the screw nut. The feed nut (32) is a standard screw nut. The detection element (4) is located on the side of the mounting sleeve (35) away from the base (31). The detection element (4) is used to detect the groove of the screw nut.

2. The detection device for a ball screw nut according to claim 1, wherein: It also includes a frame (1) and a linear guide rod (22). The linear guide rod (22) is fixedly connected to the frame (1) by a fixing plate (21). The axis of the linear guide rod (22) is parallel to the axis of the fixing port (312). The base (31) is provided with a guide port (311). The linear guide rod (22) is slidably connected to the inner wall of the guide port (311).

3. The detection device for a ball screw nut according to claim 2, wherein: It also includes a handle (34), which is fixedly connected to the base (31) and is used by the operator to hold and move the base (31).

4. The detection device for a ball screw nut according to claim 2, wherein: It also includes a front limiting member (5), which is located on the side of the base (31) near the detection member (4). The front limiting member (5) is connected to the outer wall of the linear guide rail and is used for the base (31) to abut against it.

5. The detection device for a ball screw nut according to claim 4, wherein: The front limiting member (5) includes a limiting ring (51) and a screw (52). The limiting ring (51) has a tightening opening (511). The linear guide rod (22) passes through the tightening opening (511). The outer wall of the limiting ring (51) has a notch (512). The notch (512) is connected to the tightening opening (511). The inner wall of the notch (512) has a first locking opening (513) and a second locking opening (514). The first locking opening (513) and the second locking opening (514) are both located on the outer periphery of the tightening opening (511). The first locking opening (513) and the second locking opening (514) both penetrate the limiting ring (51) axially. The screw (52) passes through the first locking opening (513) and is threaded to the second locking opening (514).

6. The detection device for a ball screw according to claim 1, wherein: It also includes a rear limiting member (6), which is located on the side of the base (31) away from the mounting sleeve (35) and is connected to the outer wall of the feed screw (33).

7. The detection device for a ball screw nut according to claim 6, wherein: The rear limiting member (6) is set as a rear limit nut (61), which is threaded to the outer wall of the feed screw (33). The diameter of the rear limit nut (61) is larger than the diameter of the fixing port (312).

8. The detection device for a ball screw nut according to claim 7, wherein: It also includes a fixing screw (62), the outer wall of the rear limit nut (61) is provided with a limiting port (611), the fixing screw (62) is threaded to the inner wall of the limiting port (611), and the fixing screw (62) is used to abut against the outer wall of the feed screw (33).

9. The detection device for a ball screw according to claim 1, wherein: It also includes a handwheel (37), which includes a rotating disk (371) and a handle (372). The rotating disk (371) is coaxially fixedly connected to the end of the feed screw (33) away from the mounting sleeve (35). One end of the handle (372) is fixedly connected to the edge of the rotating disk (371). The axis of the handle (372) is parallel to the axis of the feed screw (33).

10. The detection device for a ball screw according to claim 1, wherein: The detection component (4) includes a fixed base (41), a detection pen (42), a controller (43), and a display screen (44). The detection pen (42) is fixedly connected to the fixed base (41), and one end of the detection pen (42) is located inside the lead screw nut. The detection pen (42) is electrically connected to the display screen (44) through the controller (43).

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