A threaded precision detection device for screw production

Abstract

The application discloses a thread precision detection equipment for screw production, and relates to the technical field of screw detection equipment, which comprises a first detection assembly and a second detection assembly arranged in an inverted triangular shape and a moving assembly located between the first detection assembly and the second detection assembly. The first detection assembly is composed of two symmetrically arranged detection columns, and detection balls are arranged at the ends of the detection columns for detecting the thread spacing of the screw. The second detection assembly comprises a support table and two sliding columns, and sliding balls are arranged at the ends of the sliding columns for detecting the inner wall of the thread. The moving assembly is composed of two moving tables, and the moving tables are provided with support blocks and rotating columns. The moving tables can drive the screw to move radially and rotate. During detection, the screw rotates while moving under the driving of the moving tables. The detection balls roll along the thread grooves to perceive the width change. The sliding balls are in contact with the side surface and the bottom surface of the thread groove to perceive the radial and axial pressure changes. The signals of multiple sensors are transmitted to a controller to realize the synchronous detection of the thread spacing, the side surface profile of the thread groove and the flatness of the bottom surface.

Description

Technical Field

[0001] This invention relates to the field of lead screw testing equipment technology, specifically a thread accuracy testing device for lead screw production. Background Technology

[0002] A lead screw is an ideal product for converting rotary motion into linear motion, or linear motion into rotary motion. It is the most commonly used transmission element in machine tools and precision machinery. Its main function is to convert rotary motion into linear motion, or torque into axial reciprocating force. It also features high precision, reversibility and high efficiency. Due to its very low frictional resistance, lead screws are widely used in various industrial equipment and precision instruments.

[0003] As a precision transmission component, the thread machining accuracy of the lead screw directly affects transmission efficiency, positioning accuracy, and service life. Therefore, it is necessary to inspect the thread accuracy of the lead screw; common methods include optical vision inspection. Although optical inspection can achieve non-contact and rapid measurement, it is easily affected by oil, reflections, and ambient light interference, and has stringent requirements for on-site working conditions. However, most of the inspection equipment currently on the market has a complex structure and a single inspection dimension, making it impossible to simultaneously obtain multiple accuracy parameters of the thread in a single feed. Furthermore, during the inspection process, mismatch between the lead screw rotation and the moving speed can easily lead to probe jamming or data distortion. Summary of the Invention

[0004] The purpose of this invention is to provide a thread accuracy testing device for lead screw production, so as to solve the problem in the prior art that it is difficult to simultaneously complete the thread pitch, tooth flank profile and tooth root flatness in a single testing process.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A thread accuracy testing device for lead screw production includes a first testing component and a second testing component;

[0007] The first detection component consists of two detection columns, which are symmetrically arranged on both sides of the second detection component. The detection columns are located above the second detection component, and a detection ball is provided at one end of each detection column, which is connected to the detection column.

[0008] The second detection component includes a support platform and two sliding columns. The two sliding columns are connected to the support platform. A sliding ball is provided at the end of each sliding column away from the support platform. The sliding ball is connected to the sliding column. The second detection component is used for detecting the inner wall of the thread of a lead screw.

[0009] A moving component is provided between the first detection component and the second detection component. The moving component consists of two moving stages, which are respectively connected to the support platform.

[0010] Preferably, an elastic column is provided on the side of the detection ball near the detection column, the detection ball is slidably connected to the detection column through the elastic column, and a first sensor is provided on the side of the elastic column away from the detection ball.

[0011] The lead screw moves radially under the action of the moving table. During the movement, the outer wall of the lead screw comes into contact with the detection ball, causing the detection ball to roll on the outer wall of the lead screw. As the detection ball rolls, it moves along the axis of the detection column between the helical groove and the outer wall of the lead screw. During the movement, the detection ball compresses or stretches the elastic column, causing the elastic column to apply pressure to the first sensor. The first sensor then converts the pressure signal of the elastic column into an electrical signal and transmits it to the controller. The controller identifies and analyzes the electrical signal of the first sensor. If the amplitude of the detected fluctuation signal is the same, the machining width of the helical groove is within the machining size range; if the detected fluctuation signal has a deviation, the machining width of the helical groove is defective.

[0012] Preferably, the two sliding columns are arranged symmetrically along the axis of the support platform. A middle plate is provided on the side of the support platform near the sliding column. The middle plate is located between the two sliding columns. An elastic element is provided between the middle plate and the sliding column. The sliding column is slidably connected to the support platform through the elastic element. A second sensor is provided on the side of the middle plate near the sliding column.

[0013] By setting an elastic element between the intermediate plate and the sliding column, when a protrusion or depression appears on the side of the helical tooth groove, the protrusion or depression will act on the sliding ball, and then the sliding ball will move radially, causing the sliding column to move in the radial direction. The sliding column moves in the radial direction towards or away from the intermediate plate, so that the sliding column squeezes or stretches the elastic element during the movement, thereby enabling the elastic element to apply pressure to the second sensor, so that the second sensor can detect the radial pressure change of the sliding column, thereby realizing the detection of the machining accuracy of the side of the helical tooth groove.

[0014] Preferably, the sliding column is provided with an elastic block and a connecting rod, the sliding ball is rotatably connected to the connecting rod, the connecting rod is slidably connected to the sliding column through the elastic block, and a third sensor is provided on the side of the connecting rod away from the sliding ball.

[0015] When a protrusion or depression appears on the bottom surface of the helical tooth groove via the connecting rod and the elastic block, the protrusion or depression will act on the sliding ball, causing the sliding ball to move axially. This causes the sliding ball to squeeze the connecting rod and the elastic block in the axial direction, which in turn causes the connecting rod to apply pressure to the third sensor. The third sensor then monitors the axial pressure change of the sliding ball, thereby enabling the detection of the machining accuracy of the bottom surface of the helical tooth groove.

[0016] Preferably, the movable platform is provided with a plurality of support blocks, and the plurality of support blocks on two movable platforms form a placement groove. A rotating cavity is provided on the side of the support block near the placement groove, and a rotating column is provided in the rotating cavity. The rotating column is driven by a power component.

[0017] The lead screw is placed in the placement slot, making it contact with several rotating columns and support blocks. Then, the controller starts the power component, which drives the rotating columns to rotate. As the rotating columns rotate, they drive the lead screw to rotate, causing the lead screw to rotate on its own axis. During the rotation of the lead screw, the helical groove rotates. Before the helical groove rotates, the second detection component extends into the helical groove. As the helical groove rotates, it moves along the helical groove, making contact with the surface of the helical groove. The movement of the second detection component is used to detect whether the machining dimensions of the helical groove meet the requirements.

[0018] Preferably, the two sliding pins extend into the spiral groove of the lead screw, the sliding ball contacts the bottom and side surfaces of the spiral groove, and the sliding ball moves along the spiral groove.

[0019] After the two sliding pins extend into the helical groove of the lead screw, the sliding pins drive the sliding balls to contact the ground and sides of the helical groove, so that the two sliding balls contact the two sides of the helical groove respectively. When the lead screw moves radially and rotates, the two sliding balls move along the helical groove.

[0020] During the movement of the sliding ball, the third sensor converts the pressure signal of the sliding ball on the connecting rod into an electrical signal and transmits it to the controller. The controller identifies and analyzes the electrical signal from the third sensor. If there are no obvious fluctuations, the bottom surface of the helical groove is smooth, i.e., there are no processing defects. If there are obvious pressure fluctuations, the bottom surface of the helical groove has processing defects (i.e., the bottom surface of the helical groove is pressing on the sliding ball, causing the sliding ball to press upward on the connecting rod and the elastic block, which in turn causes the connecting rod to press on the third sensor).

[0021] While the sliding ball moves, the second sensor detects the radial displacement of the sliding ball. When the second sensor converts the pressure signal of the sliding column on the elastic element into an electrical signal and transmits it to the controller, the controller identifies and analyzes the electrical signal of the second sensor. If there is no obvious movement change, the side of the helical groove is in a smooth state, that is, there is no processing defect; if there is an obvious movement change, the side of the helical groove has a processing defect (that is, the side of the helical groove squeezes the sliding ball, causing the sliding ball to move closer to the middle plate, and then the sliding ball squeezes the sliding column, and the sliding column squeezes closer to the middle plate. During the squeezing process, the sliding column pushes the elastic element to move, so that the elastic element applies pressure to the second sensor, thereby allowing the second sensor to monitor the pressure change of the elastic element).

[0022] The sliding ball contacts the bottom and side of the helical groove, and moves with the screw as the screw moves, in conjunction with the radial movement and rotation of the screw. Thus, the sliding ball completes the accuracy detection of the helical groove of the screw during the movement.

[0023] Preferably, the bottom of the mobile platform is provided with a base platform, the middle of the base platform is provided with a ladder groove, the two sides of the ladder groove are provided with guide rails, the side of the mobile platform near the guide rail is provided with a track groove, the track groove is provided with a power unit, and the track groove is slidably connected to the guide rail through the power unit.

[0024] Several rotating columns drive the lead screw to rotate within the placement slot. Simultaneously, the controller activates the power unit (a combination of a motor and a transmission wheel; the motor drives the transmission wheel to rotate, and the transmission wheel makes frictional contact with the guide rail). The power unit then moves the track groove, which in turn moves the moving table. This causes the moving table to move along the guide rail towards the first and second detection components. The speed of the moving table matches the rotation speed of the rotating columns, ensuring that the second detection component moves at a uniform speed within the helical groove of the lead screw. This guarantees the accuracy of the second detection component's detection of the helical groove machining dimensions and avoids jamming within the helical groove caused by excessively high lead screw rotation speed or excessively high moving table speed.

[0025] Preferably, while the moving stage moves the lead screw closer to the first detection component and the second detection component, the moving stage also drives the lead screw to rotate via a rotating column.

[0026] The movable stage drives the lead screw to move radially, while the support block and rotating column drive the lead screw to rotate. This causes the lead screw to rotate during the radial movement, and the second detection component extends into the helical groove, so that the second detection component and the lead screw form a screw-nut connection state of meshing transmission.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] 1. By arranging the first and second detection components in an inverted triangle and coordinating the radial movement and rotation of the moving component, simultaneous detection of the screw thread pitch, the side profile of the helical groove, and the surface accuracy of the bottom surface of the helical groove is achieved. This equipment can acquire multiple accuracy indicators in a single feed, significantly improving detection efficiency. Secondly, the detection ball at the end of the detection column, in conjunction with the elastic column and the first sensor, can sense the pressure fluctuation signal caused by changes in the thread groove width in real time, thereby accurately determining whether the pitch machining dimension is qualified. The synergistic effect of the sliding column, sliding ball, intermediate plate, elastic element, and second sensor can detect radial pressure changes caused by protrusions or depressions on the side of the helical groove, realizing dynamic monitoring of the side profile accuracy of the helical groove. The elastic block, connecting rod, and third sensor inside the sliding column can capture axial pressure fluctuations caused by unevenness of the bottom surface of the helical groove, ensuring that the smoothness of the bottom surface of the helical groove meets the requirements. The combination of these three components forms a full-section accuracy detection chain from the top of the thread, the side, to the bottom, overcoming the shortcomings of traditional equipment that can only detect a single parameter.

[0029] 2. The moving platform is equipped with a support block, a rotating cavity, and a rotating column driven by a power component, which allows the lead screw to rotate smoothly in the placement groove. At the same time, the guide rail on the base platform cooperates with the track groove and power unit at the bottom of the moving platform to achieve precise matching between the radial feed speed and the rotation speed. This ensures that the sliding ball of the second detection component always moves at a uniform speed along the helical tooth groove, avoiding jamming or measurement jumps caused by speed mismatch, and improving the stability of the detection process and the reliability of the data. Attached Figure Description

[0030] Figure 1 A schematic diagram of the structure used for testing the lead screw;

[0031] Figure 2 A side view of the lead screw during inspection;

[0032] Figure 3 This is a schematic diagram of the structure when the lead screw is not placed inside the device.

[0033] Figure 4 This is a top view of the mobile platform;

[0034] Figure 5 This is a structural schematic diagram of the first detection component, the second detection component, and the base platform;

[0035] Figure 6 This is a schematic diagram of the structure of the second detection component;

[0036] Figure 7 This is a schematic diagram of the structure of the first detection component.

[0037] In the diagram: 1. First detection component; 11. Detection column; 12. Detection ball; 13. Elastic column;

[0038] 2. Second detection component; 21. Support platform; 22. Sliding column; 23. Sliding ball; 24. Intermediate plate;

[0039] 3. Moving platform; 31. Support block; 32. Placement slot; 33. Rotating cavity; 34. Rotating column; 35. Track groove;

[0040] 4. Base platform; 41. Ladder groove; 42. Guide rail. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Example: Figures 1-7 As shown, the present invention provides a technical solution: a thread accuracy testing device for lead screw production, comprising a first testing component 1 and a second testing component 2, wherein the first testing component 1 and the second testing component 2 are arranged in an inverted triangle.

[0043] The first detection component 1 consists of two detection columns 11, which are symmetrically arranged on both sides of the second detection component 2. The detection columns 11 are located above the second detection component 2. One end of each detection column 11 is provided with a detection ball 12, which is connected to the detection column 11. The first detection component 1 is used for detecting the thread pitch of the lead screw.

[0044] The second detection component 2 comprises a support platform 21 and two sliding columns 22. The two sliding columns 22 are connected to the support platform 21. A sliding ball 23 is provided at the end of the sliding column 22 away from the support platform 21. The sliding ball 23 is connected to the sliding column 22. The second detection component 2 is used for detecting the inner wall of the thread of the lead screw.

[0045] A moving component is provided between the first detection component 1 and the second detection component 2. The moving component consists of two moving platforms 3, which are respectively connected to the support platform 21. The two moving platforms 3 are used to place the lead screw and drive it to move.

[0046] In one specific embodiment of the present invention, an elastic column 13 is provided on the side of the detection ball 12 near the detection column 11, the detection ball 12 is slidably connected to the detection column 11 through the elastic column 13, and a first sensor is provided on the side of the elastic column 13 away from the detection ball 12.

[0047] In one specific embodiment of the present invention, the two sliding columns 22 are symmetrically arranged along the axis of the support platform 21. A middle plate 24 is provided on the side of the support platform 21 near the sliding column 22. The middle plate 24 is located between the two sliding columns 22. An elastic element (spring) is provided between the middle plate 24 and the sliding column 22. The sliding column 22 is slidably connected to the support platform 21 through the elastic element. A second sensor is provided on the side of the middle plate 24 near the sliding column 22.

[0048] In one specific embodiment of the present invention, the sliding column 22 is provided with an elastic block and a connecting rod, the sliding ball 23 is rotatably connected to the connecting rod, the connecting rod is slidably connected to the sliding column 22 through the elastic block (the elastic block is a spring), and a third sensor is provided on the side of the connecting rod away from the sliding ball 23.

[0049] In one specific embodiment of the present invention, the mobile platform 3 is provided with a plurality of support blocks 31, and the plurality of support blocks 31 on two mobile platforms 3 form a placement groove 32. A rotating cavity 33 is provided on the side of the support block 31 near the placement groove 32, and a rotating column 34 is provided in the rotating cavity 33. The rotating column 34 is driven by a power component (the power component is a drive motor).

[0050] In one specific embodiment of the present invention, the two sliding columns 22 extend into the spiral groove of the lead screw, the sliding ball 23 contacts the bottom and side surfaces of the spiral groove, and the sliding ball 23 moves along the spiral groove.

[0051] In one specific embodiment of the present invention, while the moving stage 3 drives the lead screw to move closer to the first detection component 1 and the second detection component 2, the moving stage 3 drives the lead screw to rotate via the rotating column 34.

[0052] In one specific embodiment of the present invention, a base platform 4 is provided at the bottom of the mobile platform 3, a ladder groove 41 is provided in the middle of the base platform 4, guide rails 42 are provided on both sides of the ladder groove 41, and a track groove 35 is provided on the side of the mobile platform 3 near the guide rails 42. A power unit is provided in the track groove 35, and the track groove 35 is slidably connected to the guide rails 42 through the power unit.

[0053] In one specific embodiment of the present invention, the first sensor, the second sensor, and the third sensor are all pressure sensors.

[0054] Working principle of the invention:

[0055] The lead screw is placed in the placement groove 32, so that the lead screw contacts several rotating columns 34 and support blocks 31. Then, the power component is started by the controller. The power component drives the rotating columns 34 to rotate, so that the rotating columns 34 drive the lead screw to rotate, so that the lead screw rotates. In the process of the lead screw rotating, the lead screw drives the helical groove to rotate. Before the helical groove rotates, the second detection component 2 extends into the helical groove. Then, in the process of the helical groove rotating, the second detection component 2 moves along the helical groove, so that the second detection component 2 contacts the surface of the helical groove during the movement. By the movement state of the second detection component 2, the processing dimensions of the helical groove are detected to see if they meet the requirements.

[0056] While several rotating columns 34 drive the lead screw to rotate within the placement groove 32, the controller starts the power unit. The power unit (a combination of a motor and a transmission wheel, where the motor drives the transmission wheel to rotate and the transmission wheel makes frictional contact with the guide rail 42) then drives the track groove 35 to move. During the movement of the track groove 35, the moving table 3 moves along the guide rail 42 towards the first detection component 1 and the second detection component 2. The speed of the moving table 3 matches the rotation speed of the rotating columns 34, allowing the second detection component 2 to move at a uniform speed within the helical groove of the lead screw. This ensures the accuracy of the second detection component 2 in detecting the machining dimensions of the helical groove and avoids the second detection component 2 from getting stuck within the helical groove due to excessive rotation speed of the lead screw or excessive movement speed of the moving table 3.

[0057] The movable stage 3 drives the lead screw to move radially, and the support block 31 and the rotating column 34 drive the lead screw to rotate, so that the lead screw generates rotational motion during the radial movement. This allows the second detection component 2 to extend into the helical groove, so that the second detection component 2 and the lead screw form a screw-nut connection state of meshing transmission.

[0058] After the two sliding pins 22 extend into the helical groove of the lead screw, the sliding pins 22 drive the sliding balls 23 to contact the ground and side of the helical groove, so that the two sliding balls 23 contact the two side of the helical groove respectively. When the lead screw moves radially and rotates, the two sliding balls 23 move along the helical groove.

[0059] As the sliding ball 23 moves, the third sensor converts the pressure signal of the sliding ball 23 on the connecting rod into an electrical signal and transmits it to the controller. The controller identifies and analyzes the electrical signal of the third sensor. If there is no obvious fluctuation, the bottom surface of the helical groove is in a smooth state, that is, there is no processing defect. If there is an obvious pressure fluctuation, the bottom surface of the helical groove has a processing defect (that is, the bottom surface of the helical groove is pressing the sliding ball 23, causing the sliding ball 23 to press the connecting rod and the elastic block upward, and then the connecting rod presses the third sensor).

[0060] While the sliding ball 23 moves, the second sensor detects the radial displacement of the sliding ball 23. When the second sensor converts the pressure signal of the sliding column 22 on the elastic element into an electrical signal and transmits it to the controller, the controller identifies and analyzes the electrical signal of the second sensor. If there is no obvious movement change, the side of the helical groove is in a smooth state, that is, there is no processing defect; if there is an obvious movement change, the side of the helical groove has a processing defect (that is, the side of the helical groove squeezes the sliding ball 23, causing the sliding ball 23 to move towards the side closer to the middle plate 24, and then the sliding ball 23 squeezes the sliding column 22, and the sliding column 22 squeezes towards the side closer to the middle plate 24. During the squeezing process, the sliding column 22 pushes the elastic element to move, so that the elastic element applies pressure to the second sensor, thereby enabling the second sensor to monitor the pressure change of the elastic element).

[0061] The sliding ball 23 contacts the bottom and side of the helical groove, and moves with the screw as the screw moves, in the process of the sliding ball 23 moving in conjunction with the radial movement and rotation of the screw. Thus, the sliding ball 23 completes the accuracy detection of the helical groove of the screw during the movement.

[0062] As the lead screw moves radially under the action of the moving table 3, its outer wall comes into contact with the detection ball 12, causing the ball to roll on the outer wall. During this rolling motion, the ball moves along the axis of the detection column 11 between the helical groove and the outer wall of the lead screw. This movement compresses or stretches the elastic column 13, causing it to apply pressure to the first sensor. The first sensor then converts the pressure signal from the elastic column 13 into an electrical signal, which is transmitted to the controller. The controller analyzes the electrical signal from the first sensor. If the detected fluctuations are all of the same amplitude, the machining width of the helical groove conforms to the machining size range; if the detected fluctuations deviate, the machining width of the helical groove is defective.

[0063] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A thread accuracy testing device for lead screw production, characterized in that: It includes a first detection component (1) and a second detection component (2), which are arranged in an inverted triangle. The first detection component (1) consists of two detection columns (11). The two detection columns (11) are symmetrically arranged on both sides of the second detection component (2). The detection columns (11) are located above the second detection component (2). A detection ball (12) is provided at one end of the detection column (11). The detection ball (12) is connected to the detection column (11). The second detection component (2) consists of a support platform (21) and two sliding columns (22). The two sliding columns (22) are connected to the support platform (21). A sliding ball (23) is provided at one end of the sliding column (22) away from the support platform (21). The sliding ball (23) is connected to the sliding column (22). A moving component is provided between the first detection component (1) and the second detection component (2). The moving component consists of two moving stages (3), and the two moving stages (3) are respectively connected to the support stage (21). An elastic column (13) is provided on the side of the detection ball (12) close to the detection column (11). The detection ball (12) is slidably connected to the detection column (11) through the elastic column (13). A first sensor is provided on the side of the elastic column (13) away from the detection ball (12). The two sliding columns (22) are symmetrically arranged along the axis of the support platform (21). A middle plate (24) is provided on the side of the support platform (21) near the sliding column (22). The middle plate (24) is located between the two sliding columns (22). An elastic element is provided between the middle plate (24) and the sliding column (22). The sliding column (22) is slidably connected to the support platform (21) through the elastic element. A second sensor is provided on the side of the middle plate (24) near the sliding column (22). The sliding column (22) is provided with an elastic block and a connecting rod. The sliding ball (23) is rotatably connected to the connecting rod. The connecting rod is slidably connected to the sliding column (22) through the elastic block. A third sensor is provided on the side of the connecting rod away from the sliding ball (23). The two sliding pins (22) extend into the spiral groove of the lead screw, and the sliding ball (23) contacts the bottom and side surfaces of the spiral groove. The sliding ball (23) moves along the spiral groove. While the moving stage (3) moves the lead screw closer to the first detection component (1) and the second detection component (2), the moving stage (3) drives the lead screw to rotate via the rotating column (34).

2. The thread accuracy testing equipment for lead screw production according to claim 1, characterized in that: The mobile platform (3) is provided with several support blocks (31), and the several support blocks (31) on the two mobile platforms (3) form a placement groove (32). A rotating cavity (33) is provided on the side of the support block (31) near the placement groove (32). A rotating column (34) is provided in the rotating cavity (33), and the rotating column (34) is driven by a power component.

3. The thread accuracy testing equipment for lead screw production according to claim 1, characterized in that: The bottom of the mobile platform (3) is provided with a base platform (4), the middle of the base platform (4) is provided with a ladder groove (41), the two sides of the ladder groove (41) are provided with guide rails (42), the side of the mobile platform (3) near the guide rails (42) is provided with a track groove (35), the track groove (35) is provided with a power unit, and the track groove (35) is slidably connected to the guide rails (42) through the power unit.

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