Guide rail pair precision measuring instrument

Abstract

The application discloses a guide rail pair precision measuring instrument, which comprises a bed body, a clamping and positioning mechanism, a motion precision measuring mechanism, a comprehensive precision measuring mechanism and a guide rail dragging force measuring mechanism. The clamping and positioning mechanism is fixedly arranged on the upper two side ends of the bed body and used for positioning and fixing the guide rail to be measured. The motion precision measuring mechanism is fixedly arranged on the guide rail slider to be measured which is matched with the guide rail to be measured. The motion precision measuring mechanism is provided with a displacement sensor which is in contact with the reference surface of the guide rail to be measured and used for detecting the motion precision of the guide rail to be measured. The comprehensive precision measuring mechanism is fixedly arranged on the clamping and positioning mechanism. The two sides and the upper part of the comprehensive measuring mechanism are provided with a plurality of measuring sensors which are used for detecting the comprehensive precision of the guide rail pair. The guide rail dragging force measuring mechanism is arranged on the guide rail slider to be measured. The guide rail pair precision measuring instrument effectively improves the operation efficiency of the guide rail pair precision measurement, is especially suitable for rapid and full-item quality inspection on a production line, and greatly shortens the detection period.

Description

Technical Field

[0001] This invention relates to the field of guide rail pair precision measurement equipment, and in particular to a guide rail pair precision measuring instrument. Background Technology

[0002] Rolling linear guide pairs, as core functional components of modern precision mechanical equipment, are widely used in high-precision electromechanical equipment such as CNC machine tools, industrial robots, and precision measuring equipment. Their accuracy and performance directly determine the positioning accuracy, motion smoothness, and reliability of the entire equipment; therefore, the accuracy measurement of rolling linear guide pairs is of paramount importance.

[0003] However, the current measuring equipment on the market has the following problems when measuring the accuracy of guide rails: (1) The functions are relatively simple. Most existing measuring instruments can only measure a single parameter, such as measuring only geometric accuracy or only drag force, and cannot comprehensively evaluate the overall accuracy performance of the guide rail pair; (2) The measurement efficiency is low. Due to the step-by-step measurement of various parameters, the guide rail pair to be measured needs to be clamped and adjusted multiple times, resulting in a long measurement cycle, which is not suitable for the rapid testing needs of the production line; (3) Due to the need for the combined use of multiple measuring instruments, the operation is complicated and cumbersome, and the technical level of the operators is required to be high, making it difficult to ensure the consistency of the measurement results. Therefore, a multi-functional guide rail pair accuracy measuring instrument that can measure multiple accuracy parameters of the guide rail pair is to be developed. Summary of the Invention

[0004] The purpose of this invention is to provide a guide rail pair precision measuring instrument to solve the technical problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: The present invention provides a guide rail pair precision measuring instrument, including a bed.

[0006] A clamping and positioning mechanism is fixedly installed on both sides of the upper part of the bed for positioning and fixing the guide rail to be tested.

[0007] A motion accuracy measuring mechanism is fixedly mounted on a slider adapted to the guide rail to be measured. The motion accuracy measuring mechanism is equipped with a displacement sensor that contacts the reference surface of the guide rail to be measured for detecting the motion accuracy of the guide rail.

[0008] A comprehensive accuracy measuring mechanism is fixedly mounted on the clamping and positioning mechanism. Multiple measuring sensors for detecting the comprehensive accuracy of the guide rail pair are provided on both sides and the top of the comprehensive measuring mechanism. A guide rail drag force measuring mechanism includes a movable frame slidably disposed on the upper part of the bed, the movable frame being provided with a tension / compression sensor, and the tension / compression sensor being fixedly connected to the slider of the guide rail pair to be measured.

[0009] A drive mechanism is mounted on the bed to drive the moving frame to move linearly.

[0010] Furthermore, the clamping and positioning mechanism includes two tooling tables fixedly disposed on both sides of the upper part of the bed. Each tooling table is fixedly provided with a magnetic suction piece on its upper part, and multiple centering clamps adapted to the guide rail to be tested are spaced apart on the tooling table.

[0011] Furthermore, the clamping and positioning mechanism also includes a fixing fixture disposed at the ends of the two tooling tables, each fixing fixture having a set screw rotatably disposed thereon, the set screw being threadedly connected to the fixing fixture, and a butterfly handle for driving its rotation being fixedly disposed at the upper end of the set screw.

[0012] Furthermore, the motion accuracy measuring mechanism includes a mounting bracket fixedly mounted on a slider adapted to the guide rail to be measured. Multiple L-shaped measuring rods are slidably mounted on the mounting bracket. The free end of the horizontal part of each measuring rod is respectively fixedly mounted with a contact head that contacts the reference surface of the guide rail to be measured. The vertical part of each measuring rod is connected to the corresponding displacement sensor fixedly mounted on the outside of the mounting bracket.

[0013] Furthermore, a spring is provided between the free end of the vertical portion of each measuring slide rod and the mounting bracket.

[0014] Furthermore, the comprehensive accuracy measurement mechanism includes a measuring frame fixedly mounted on the tooling table, and each of the measuring sensors is calibrated and mounted on the measuring frame via a fixed calibration block.

[0015] Furthermore, the guide rail drag force measuring mechanism also includes a measuring link connecting the slider to be measured and the tension / compression sensor, and the measuring link is connected to the tension / compression sensor through a rod end bearing.

[0016] Furthermore, a connecting block is fixedly provided on the upper part of the mounting bracket, and the lower end of the measuring rod is inserted into the connecting block.

[0017] Furthermore, the drive mechanism includes a transmission rack fixedly mounted on the bed and a drive motor fixedly mounted on the upper part of the moving frame. The drive shaft of the drive motor passes through the moving frame and has a transmission gear adapted to the transmission rack fixedly mounted at its end.

[0018] Furthermore, two limiting guide rails are symmetrically fixedly installed on the upper part of the bed, and two limiting sliders that are respectively adapted to the two limiting guide rails are symmetrically fixedly installed on the bottom of the moving frame.

[0019] Compared with the prior art, the beneficial technical effects of the present invention are as follows: This invention integrates the motion accuracy measurement mechanism, the comprehensive accuracy measurement mechanism, and the guide rail drag force measurement mechanism onto the same measurement platform (bed), thereby effectively changing the traditional step-by-step, instrument-based measurement mode used in guide rail pair accuracy measurement. This allows operators to sequentially or selectively measure all three key performance parameters by clamping the guide rail pair under test once. Furthermore, it enables the measurement and detection of the horizontal, vertical, and oscillation errors of the slider under test moving along the rolling linear guide rail throughout its entire stroke. This significantly improves the efficiency of guide rail pair accuracy measurement, making it particularly suitable for rapid, full-item quality inspection on production lines and greatly shortening the inspection cycle.

[0020] In this invention, when measuring the motion accuracy of a guide rail pair, a mounting bracket equipped with a displacement sensor and a contact head is directly fixed to the slider to be measured. As the slider moves along the guide rail, the contact head remains in contact with the guide rail reference surface. The displacement sensor directly detects the actual motion deviation of the slider relative to the guide rail reference. Since the measurement reference and the usage reference are unified, the measurement error caused by introducing an external measurement reference in traditional methods is eliminated. The measurement results more directly reflect the true motion accuracy of the guide rail pair, thus improving measurement accuracy.

[0021] The clamping and positioning mechanism of this invention combines magnetic initial fixation with mechanical final locking. First, the magnetic force of the fixture and the centering clamp are used to quickly and initially position and center the guide rail to be measured. Then, the set screw on the fixing clamp mechanically clamps the guide rail. This effectively avoids interference that strong magnetism might cause to the high-precision displacement sensor, ensuring that the guide rail does not shift during the entire measurement process, providing a stable foundation for high-precision measurement. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the clamping and positioning mechanism in this invention; Figure 3 This is a schematic diagram showing the cooperation between the fixing fixture and the guide rail to be tested in this invention; Figure 4 This is a schematic diagram of the motion accuracy measurement mechanism from the main viewpoint in this invention; Figure 5This is a top-view structural diagram of the motion accuracy measurement mechanism in this invention; Figure 6 This is a three-dimensional structural diagram of the integrated accuracy measurement mechanism in this invention; Figure 7 This is a schematic diagram of the main view structure of the integrated accuracy measurement mechanism in this invention; Figure 8 This is a three-dimensional structural diagram of the guide rail drag force measuring mechanism in this invention; Figure 9 This is a three-dimensional structural diagram of the driving mechanism in this invention; Explanation of reference numerals in the attached drawings: 1. Bed; 2. Guide rail to be measured; 3. Tooling table; 4. Centering fixture; 5. Fixing fixture; 6. Set screw; 7. Butterfly handle; 8. Sliding block to be measured; 9. Displacement sensor; 10. Mounting bracket; 11. Measuring slide bar; 12. Contact head; 13. Spring; 14. Measuring sensor; 15. Measuring frame; 16. Moving frame; 17. Tension / compression sensor; 18. Measuring connecting rod; 19. Rod end bearing; 20. Connecting block; 21. Transmission rack; 22. Drive motor; 23. Transmission gear; 24. Limiting guide rail; 25. Limiting slider. Detailed Implementation

[0024] like Figures 1-9 As shown, a guide rail pair precision measuring instrument includes a bed 1, a clamping and positioning mechanism, a motion precision measuring mechanism, a comprehensive precision measuring mechanism, a guide rail drag force measuring mechanism, and a drive mechanism.

[0025] The clamping and positioning mechanism is fixedly installed on both upper sides of the bed 1 for positioning and fixing the guide rail 2 to be tested. Specifically, as shown... Figure 2 As shown, the clamping and positioning mechanism includes two fixture tables 3 fixedly installed on both sides of the upper part of the bed 1. Each fixture table 3 has a magnetic suction plate fixedly installed on its upper part, and the guide rail 2 to be tested is initially fixed to the fixture table 3 using a magnetic suction method. Furthermore, multiple centering clamps 4 adapted to the guide rail 2 to be tested are installed at intervals on the fixture tables, thereby centering and positioning the guide rail 2 to be tested.

[0026] In addition, to prevent strong magnets from adversely affecting the accuracy of measurement data, the clamping and positioning mechanism also includes fixing fixtures 5 installed at the ends of the two tooling tables 3 and adapted to the guide rail 2 to be measured, as shown in the figure below. Figure 3As shown, each of the fixing clamps 5 is rotatably mounted with a set screw 6. The set screw 6 is threadedly connected to the upper part of the fixing clamp 5. The upper end of the set screw 6 is fixedly provided with a butterfly handle 7 for driving its rotation. By rotating the butterfly handle 7, the set screw 6 is axially fed and abuts against the upper end face of the guide rail 2 to achieve the tightening effect of the guide rail 2 to be tested, so as to avoid the position movement of the guide rail 2 to be tested during subsequent measurement.

[0027] The motion accuracy measuring mechanism is fixedly installed on the slider 8 of the test rail 2, which is adapted to the test rail 2. The motion accuracy measuring mechanism is equipped with a displacement sensor 9 that is in contact with the reference surface of the test rail 2 for detecting the motion accuracy of the test rail.

[0028] Specifically, such as Figures 4-5 As shown, the motion accuracy measuring mechanism adopts a self-calibrating method. It includes a mounting bracket 10 fixedly mounted on a slider 8 adapted to the guide rail 2 under test. Multiple L-shaped measuring rods 11 are slidably mounted on the mounting bracket 10. Each measuring rod 11 has a contact head 12 fixedly mounted at its horizontal free end, which contacts the reference surface of the guide rail 2 under test. The vertical part of each measuring rod 11 is connected to a corresponding displacement sensor 9 fixedly mounted on the outside of the mounting bracket 10. Furthermore, a spring 13 is provided between the vertical free end of each measuring rod 11 and the mounting bracket 10. The spring force of the spring 13 ensures that the contact head 12 at the end of the measuring rod 11 is always in contact with the reference surface of the guide rail 2 under test.

[0029] When measuring the motion accuracy of the guide rail pair, it is only necessary to move the slider 8 under test along the measuring guide rail 2 in a straight line. The changes detected by each displacement sensor 9 during the movement of the slider 8 along the measuring guide rail 2 are the motion accuracy of the slider under test. Moreover, in this embodiment, each displacement sensor 9 contacts the reference surface of the guide rail 2 under test through the contact head 12 on its corresponding measuring slide 11, which can effectively avoid the influence of friction and wear on the measurement results, thereby improving the measurement accuracy of the motion accuracy measuring mechanism and the service life of the displacement sensors.

[0030] The comprehensive accuracy measuring mechanism is fixedly installed on the clamping and positioning mechanism, and multiple measuring sensors 14 for detecting the comprehensive accuracy of the guide rail pair are installed on both sides and the top of the comprehensive measuring mechanism.

[0031] Specifically, such as Figures 6-7As shown, the comprehensive accuracy measurement mechanism adopts a fixed through-type measurement method, which includes a measuring frame 15 fixedly installed on the tooling table 3. After calibrating each measuring sensor 14 using standard blocks, each measuring sensor 14 is fixedly installed at its corresponding position on the measuring frame 15. During measurement, the slider 8 to be measured only needs to be pushed along the guide rail 2 to the position of the measuring frame 15, and the comprehensive accuracy measurement of the guide rail pair can be achieved through the various measuring sensors 14.

[0032] In this embodiment, each of the measuring sensors 14 is specifically a displacement sensor. After the slider is mounted on the guide rail, the combined height H and the distance N between the slider's reference surface and the guide rail's reference surface are fixed. The overall accuracy of the guide rail describes the variation between these two values ​​among multiple sliders on the same guide rail. During measurement, a standard block (H and N values ​​are the theoretically correct values ​​of the workpiece to be measured) is used to calibrate the displacement sensor and record the data. Then, the slider is pushed into the position of the overall accuracy measuring mechanism on the guide rail, and the value displayed by the displacement sensor is recorded. The other multiple sliders perform the above operation steps in sequence, and the variation is calculated by the supporting software.

[0033] The guide rail drag force measuring mechanism includes a movable frame 16 slidably mounted on the upper part of the bed 1. A tension and compression sensor 17 is mounted on the movable frame 16, and the tension and compression sensor 17 is fixedly connected to the slider 8 of the guide rail pair to be tested.

[0034] Specific examples Figure 8 As shown, the guide rail drag force measuring mechanism also includes a measuring rod 18 connecting the slider 8 to be tested and the tension / compression sensor 17, and the measuring rod 18 is connected to the tension / compression sensor 17 via a rod end bearing 19. When the moving frame 16 drags the slider 8 to be tested along the guide rail 2 at a certain speed, the torque on the slider 8 is transmitted to the pressure sensor 17 through the measuring rod 18 and the rod end bearing 19, thereby detecting the value of the guide rail drag force through the pressure sensor 17. In addition, in this embodiment, a connecting block 20 is fixedly installed on the upper part of the mounting bracket 10 by screws, and the lower end of the measuring rod 18 is inserted into a slot on the connecting block 20, so that the synchronous measurement of the guide rail pair motion accuracy and the guide rail drag force can be achieved during the linear motion of the slider 8 to be tested.

[0035] The drive mechanism is mounted on the bed 1 and is used to drive the moving frame 16 to move linearly.

[0036] Specifically, such as Figure 9As shown, the drive mechanism includes a transmission rack 21 fixedly mounted on the bed 1 and a drive motor 22 fixedly mounted on the upper part of the movable frame 16. The drive shaft of the drive motor 22 passes through the movable frame 16, and a transmission gear 23 adapted to the transmission rack 21 is fixedly mounted at its end. When the drive motor 22 drives the transmission gear 23 to rotate, the transmission gear 23 maintains a meshing transmission relationship with the transmission rack 21, and the movable frame 16 moves linearly under the action of their meshing force. In addition, two limiting guide rails 24 are symmetrically fixedly mounted on the upper part of the bed 1, and two limiting sliders 25, each adapted to the two limiting guide rails 24, are symmetrically fixedly mounted on the bottom of the movable frame 16. Through the limiting sliding cooperation between the two sets of limiting sliders 25 and the limiting guide rails 24, the stability of the linear movement of the movable frame 16 is ensured.

[0037] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A guide rail pair precision measuring instrument, characterized in that: Including the bed frame; A clamping and positioning mechanism is fixedly installed on both sides of the upper part of the bed for positioning and fixing the guide rail to be tested; A motion accuracy measuring mechanism is fixedly mounted on a slider adapted to the guide rail under test. The motion accuracy measuring mechanism is equipped with a displacement sensor that contacts the reference surface of the guide rail under test for detecting the motion accuracy of the guide rail under test. A comprehensive accuracy measuring mechanism is fixedly mounted on the clamping and positioning mechanism. Multiple measuring sensors for detecting the comprehensive accuracy of the guide rail pair are provided on both sides and the top of the comprehensive measuring mechanism. A guide rail drag force measuring mechanism includes a movable frame slidably disposed on the upper part of the bed, the movable frame being provided with a tension / compression sensor, and the tension / compression sensor being fixedly connected to the slider of the guide rail pair to be measured; A drive mechanism is mounted on the bed to drive the moving frame to move linearly.

2. The guide rail pair precision measuring instrument according to claim 1, characterized in that: The clamping and positioning mechanism includes two tooling tables fixedly installed on both sides of the upper part of the bed. Each tooling table has a magnetic suction piece fixedly installed on its upper part. Multiple centering clamps adapted to the guide rail to be tested are spaced apart on the tooling table.

3. The guide rail pair precision measuring instrument according to claim 2, characterized in that: The clamping and positioning mechanism further includes a fixing fixture disposed at the ends of the two tooling tables. Each fixing fixture is rotatably provided with a set screw, which is threadedly connected to the fixing fixture. The upper end of the set screw is fixedly provided with a butterfly handle for driving its rotation.

4. The guide rail pair precision measuring instrument according to claim 1, characterized in that: The motion accuracy measuring mechanism includes a mounting bracket fixedly mounted on a slider adapted to the guide rail to be measured. Multiple L-shaped measuring rods are slidably mounted on the mounting bracket. The free end of the horizontal part of each measuring rod is respectively fixedly mounted with a contact head that contacts the reference surface of the guide rail to be measured. The vertical part of each measuring rod is connected to the corresponding displacement sensor fixedly mounted on the outside of the mounting bracket.

5. The guide rail pair precision measuring instrument according to claim 4, characterized in that: A spring is provided between the free end of the vertical part of each measuring slide rod and the mounting bracket.

6. The guide rail pair precision measuring instrument according to claim 2, characterized in that: The comprehensive accuracy measurement mechanism includes a measuring frame fixedly mounted on the tooling table, and each of the measuring sensors is calibrated and mounted on the measuring frame by a fixed calibration block.

7. The guide rail pair precision measuring instrument according to claim 4, characterized in that: The guide rail drag force measuring mechanism also includes a measuring link connecting the slider to be measured and the tension / compression sensor, and the measuring link is connected to the tension / compression sensor through a rod end bearing.

8. The guide rail pair precision measuring instrument according to claim 7, characterized in that: A connecting block is fixedly installed on the upper part of the mounting bracket, and the lower end of the measuring rod is inserted into the connecting block.

9. The guide rail pair precision measuring instrument according to claim 1, characterized in that: The drive mechanism includes a transmission rack fixedly mounted on the bed and a drive motor fixedly mounted on the upper part of the moving frame. The drive shaft of the drive motor passes through the moving frame and has a transmission gear adapted to the transmission rack fixedly mounted at its end.

10. The guide rail pair precision measuring instrument according to claim 9, characterized in that: The upper part of the bed is symmetrically fixed with two limiting guide rails, and the bottom of the movable frame is symmetrically fixed with two limiting sliders that are respectively adapted to the two limiting guide rails.

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