A linear guideway pair precision automatic detection system and precision detection method

Abstract

The present invention relates to the field of linear guide technology, and specifically to an automatic detection system and method for the accuracy of a linear guide pair. The present invention provides an automatic detection system for the accuracy of a linear guide pair, wherein the linear guide pair includes a linear rail and a slider, and the detection system includes an operating table, an automatic detection platform, and an accuracy measurement component for measuring the accuracy of the linear guide pair; an installation station extending along a first direction is provided on the detection table of the automatic detection platform. When the accuracy of the linear guide pair is measured using the automatic detection system for the accuracy of the linear guide pair, there is no need to manually tighten or loosen the screws during the entire test. The operating table, hydraulic fasteners, and accuracy measurement components are used to adjust the flatness of the top surface of the linear rail, and the operating table, hydraulic telescopic parts, and accuracy measurement components are used to adjust the flatness of the side surface of the linear rail. The entire alignment process is simpler and more efficient, greatly improving the alignment efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of linear guide rails, and particularly relates to an automatic precision detection system and a precision detection method for a linear guide rail pair. Background Art

[0002] A linear guide rail pair is a linear drive unit with high precision, high efficiency, and long service life, and is widely used in fields such as machine tools, automobiles, and aerospace. Its running precision has a great impact on the performance. In order to improve the product performance of domestic rolling linear guide rail pairs, it is necessary to detect the running precision of the linear guide rail pairs. The measurement methods for the running precision of linear guide rail pairs mainly include manual measurement and automated measurement. The manual measurement method has high requirements for the precision and roughness of the detection platform and high requirements for the operation of the testers, with low detection efficiency and poor repeatability. The automated measurement methods are divided into contact type and non-contact type: the non-contact measurement method has high costs, is greatly affected by environmental factors, and has large errors in the measured results; the contact measurement method requires placing the sensor contact on the slider, which is relatively convenient and has small errors.

[0003] Currently, whether using the manual measurement method or the automated measurement method, the following work needs to be carried out: 1. Preparation work before installation: Clean the installation surface: Before installing the linear guide rail, it is necessary to remove the burrs, dirt, and surface scars on the bed installation surface to ensure that the bed installation surface is flat and clean.

[0004] 2. Check the guide rail and the slider: Check the appearance of the linear guide rail and the slider to ensure that there are no problems such as deformation, damage, or rust.

[0005] 3. Place the guide rail flat on the bed installation surface, making the side of the guide rail face the lateral installation surface of the bed, and then fix the bottom reference surface of the guide rail on the bed installation surface with assembly screws, but do not fully tighten.

[0006] 4. Sequentially tighten the guide rail positioning bolts to make the guide rail closely fit the lateral installation surface of the bed to determine the position of the slide rail.

[0007] 5. Use a torque wrench to tighten the assembly screws according to the specified torque value.

[0008] 6. Use a level or a sensor contact to measure the levelness of the guide rail. If necessary, adjust the levelness of the guide rail by adjusting the shims or assembly screws to ensure the precision of the guide rail in the horizontal direction.

[0009] 7. For the remaining paired guide rails, install them according to the methods in steps 1 to 6.

[0010] It can be seen that when measuring the accuracy of a linear guide pair at present, it is necessary to manually tighten the assembly screws and the guide rail positioning bolts, so a lot of time and energy are required to align the accuracy, which seriously affects the inspection efficiency. Summary of the Invention

[0011] The problem to be solved by the present invention is that when measuring the accuracy of a linear guide pair at present, it is necessary to manually tighten the assembly screws and the guide rail positioning bolts, so a lot of time and energy are required to align the accuracy, which seriously affects the inspection efficiency.

[0012] Technical Solution

[0013] An automatic detection system for the accuracy of a linear guide pair, the linear guide pair includes a linear guide rail and a slider, and the detection system includes an operation table, an automatic detection platform and an accuracy measurement component for measuring the accuracy of the linear guide pair;

[0014] On the detection table surface of the automatic detection platform, there is an installation station extending along a first direction, and a plurality of through holes are arranged in a row along the first direction on the installation station; a plurality of installation grooves corresponding to the through holes one by one are arranged on the automatic detection platform, the installation grooves extend along a second direction, and the through holes are communicated with the corresponding installation grooves;

[0015] A hydraulic fastener is installed in each installation groove, the hydraulic fastener includes a locking screw and a lower oil cylinder, and the lower oil cylinder is used to pull down the locking screw located in the installation counterbore of the linear guide rail according to the instruction of the operation table to adjust the flatness of the top surface of the linear guide rail;

[0016] On one side of the installation station, a plurality of hydraulic telescopic members are arranged in a row along the first direction, and the hydraulic telescopic members are used to apply pressure to the side surface of the linear guide rail according to the instruction of the operation table to adjust the flatness of the side surface of the linear guide rail; the first direction and the second direction are perpendicular to each other.

[0017] According to an embodiment of the present invention, the accuracy measurement component includes a saddle seat, a linear driving mechanism, at least one linear guide rail flatness measurement mechanism and at least one slider flatness measurement mechanism;

[0018] The saddle seat is slidably installed on the detection table surface of the automatic detection platform, the linear guide rail flatness measurement mechanism and the slider flatness measurement mechanism are installed on the same side of the saddle seat, the linear driving mechanism is used to drive the saddle seat to move along the first direction according to the instruction of the operation table, the linear guide rail flatness measurement mechanism is used to measure the flatness of the top surface and the side surface of the linear guide rail, and the slider flatness measurement mechanism is used to measure the flatness of the top surface and the side surface of the slider.

[0019] According to an embodiment of the present invention, a pull rod is connected to the cylinder end of the lower oil cylinder, a clamping block structure is provided at the bottom end of the locking screw, and a slot structure for cooperating with the clamping block structure is provided at one end of the pull rod away from the lower oil cylinder;

[0020] When the locking screw rotates to the first state, the clamping block structure and the slot structure are clamped; when the locking screw rotates to the second state, the clamping block structure and the slot structure are separated.

[0021] According to an embodiment of the present invention, the clamping block structure includes a fixed column provided at the bottom end of the locking screw and a plurality of locking blocks, and the plurality of locking blocks are uniformly arranged around the axis of the fixed column;

[0022] The slot structure includes a circular groove opened at the top end of the pull rod, a plurality of offset holes are opened on the side wall of the pull rod around its axis, the offset holes correspond to the locking blocks one by one and are communicated with the circular groove, the depth direction of the offset holes is the same as the radial direction of the pull rod, the inner wall of the offset holes is connected to the top surface of the pull rod, and a plurality of arc-shaped blocks corresponding to the locking blocks one by one are provided on the inner wall of the circular groove near its top, and the arc-shaped blocks are located between two adjacent offset holes;

[0023] When the locking screw rotates to the first state, the locking block is located directly below the corresponding arc-shaped block; when the locking screw rotates to the second state, the locking block and the corresponding arc-shaped block are horizontally staggered.

[0024] According to an embodiment of the present invention, the hydraulic telescopic member includes a side oil cylinder and a top head, a side plate extending along a first direction is provided on the detection table surface of the automatic detection platform, the side plate is located outside the installation station, the side oil cylinder is fixedly installed on the side plate, and the top head is installed at the cylinder end of the side oil cylinder and points to the side surface of the linear guide.

[0025] According to an embodiment of the present invention, it includes at least one linear module mechanism and at least one hydraulic slider clamping member, the linear module mechanism is installed on the detection table surface along the first direction, and the hydraulic slider clamping member is installed on the moving block of the linear module mechanism;

[0026] The hydraulic slider clamping member includes a slider locking oil cylinder, a fixing plate and two limiting pieces, the slider locking oil cylinder extends along a second direction, the fixing plate is installed at the cylinder end of the slider locking oil cylinder, and the two limiting pieces are arranged along the first direction and installed on the surface of the fixing plate facing the slider, the slider has a first end face and a second end face parallel to each other along the first direction, and the distance between the two limiting pieces is not less than the distance between the first end face and the second end face.

[0027] According to an embodiment of the present invention, the linear guide flatness measuring mechanism includes a first X-axis moving mechanism, a first Z-axis moving mechanism, a first digital display three-point contact measuring device, and a second digital display three-point contact measuring device. The first Z-axis moving mechanism is vertically disposed on the saddle seat. The second digital display three-point contact measuring device is installed on the first Z-axis moving mechanism. The first Z-axis moving mechanism is used to drive the second digital display three-point contact measuring device to move up and down to approach or move away from the top surface of the linear guide. The first X-axis moving mechanism is installed on the saddle seat along the second direction. The first digital display three-point contact measuring device is installed on the first X-axis moving mechanism. The first X-axis moving mechanism is used to drive the first digital display three-point contact measuring device to move along the second direction to approach or move away from the side surface of the linear guide.

[0028] According to an embodiment of the present invention, the slider flatness measuring mechanism includes a second X-axis moving mechanism, a second Z-axis moving mechanism, a third digital display three-point contact measuring device, and a fourth digital display three-point contact measuring device. The second Z-axis moving mechanism is vertically disposed on the saddle seat. The fourth digital display three-point contact measuring device is installed on the second Z-axis moving mechanism. The second Z-axis moving mechanism is used to drive the fourth digital display three-point contact measuring device to move up and down to approach or move away from the top surface of the slider. The second X-axis moving mechanism is installed on the saddle seat along the second direction. The third digital display three-point contact measuring device is installed on the second X-axis moving mechanism. The second X-axis moving mechanism is used to drive the third digital display three-point contact measuring device to move along the second direction to approach or move away from the side surface of the slider.

[0029] According to an embodiment of the present invention, the linear drive mechanism includes a first motor, a lead screw, and two air floating guides. The air floating guides are installed on the detection table surface along the first direction. The saddle seat is fixed to the air floating slider of the air floating guide.

[0030] Two bearing seats are arranged and installed on the detection table surface along the first direction. The lead screw is rotatably installed between the two bearing seats. The saddle seat is threadedly connected to the lead screw. The first motor is installed on the detection table surface, and its output end is connected to one end of the lead screw.

[0031] A method for detecting the accuracy of a linear guide pair includes the following steps:

[0032] S1; Place the linear guide pair to be detected on the installation station of the automatic detection platform, such that the side surface of the linear guide abuts against the lateral installation surface of the installation station, and then use the lower oil cylinder and the locking screw in the hydraulic fastener to cooperate to assemble the linear guide pair to be detected onto the installation station, wherein the shortening length of each lower oil cylinder is the same;

[0033] S2: Control the linear drive mechanism to drive the linear guide flatness measuring mechanism to move to the first end of the linear guide, control the linear module mechanism to drive the slider to move to the second end of the linear guide, and control the linear drive mechanism to drive the linear guide flatness measuring mechanism to slowly move towards the second end of the linear guide at a set speed;

[0034] When the reading of the second digital three-point contact measuring device exceeds the set deviation range, mark the coordinates at that place, and the operating platform controls the lower oil cylinder at that coordinate to correspondingly increase or decrease the downward pulling force on the locking screw. Then continue to measure the displacement at that coordinate. If it still exceeds the set deviation range, continue to increase or decrease the downward pulling force on the locking screw until the displacement at that coordinate meets the set deviation range;

[0035] After the second digital three-point contact measuring device moves to the second end of the linear guide, record all the pulling force values applied by the lower oil cylinders to the locking screws, and then control the linear drive mechanism to drive the saddle to return to the first end of the linear guide;

[0036] S3: Start the first precision detection. Control the linear drive mechanism to drive the linear guide flatness measuring mechanism and the slider flatness measuring mechanism to move towards the position where the slider is located. Use the linear guide flatness measuring mechanism and the slider flatness measuring mechanism to measure the parallelism deviation data of the top surface of the linear guide relative to the top surface of the slider and the parallelism deviation data of the side surface of the linear guide relative to the side surface of the slider respectively. Align with the allowable deviation in the national standard to evaluate the precision grade of this linear guide pair;

[0037] S4: Control the linear drive mechanism to drive the saddle to return to the first end of the linear guide again. The operating platform controls all the lower oil cylinders to extend by a set length M1 to facilitate the lateral adjustment of the linear guide;

[0038] Control all the side oil cylinders to extend by a set length so that the linear guide is tightly pressed against the lateral installation surface of the installation station;

[0039] Control the linear drive mechanism to drive the linear guide flatness measuring mechanism to slowly move towards the second end of the linear guide at a set speed. When the reading of the first digital three-point contact measuring device exceeds the set deviation range, mark the coordinates at that place, and the operating platform controls the side oil cylinder at that coordinate to increase or decrease the pressing force on the side surface of the linear guide. Then continue to measure the displacement at that coordinate. If it still exceeds the set deviation range, continue to increase or decrease the pressing force on the side surface of the linear guide until the displacement at that coordinate meets the set deviation range;

[0040] After the first digital three-point contact measuring device moves to the second end of the linear guide, record all the pressure values applied by the side oil cylinders to the linear guide, and then control the linear drive mechanism to drive the saddle to return to the first end of the linear guide;

[0041] S5: The operating platform controls all the lower oil cylinders to shorten by a set length M1;

[0042] S6: Start the second precision detection: Measure the parallelism deviation data of the top surface of the linear guide rail relative to the top surface of the slider and the parallelism deviation data of the side surface of the linear guide rail relative to the side surface of the slider according to the method recorded in S. Align with the allowable deviation in the national standard to evaluate the precision grade of the linear guide rail pair in the actual installation state. Finally, record the tensile force values applied by all the lower oil cylinders to the linear guide rail and the pressure values applied by all the side oil cylinders to the linear guide rail again, and record the tensile force values applied by all the lower oil cylinders to the linear guide rail and the pressure values applied by all the side oil cylinders to the linear guide rail in a booklet in the product manual for reference during subsequent actual installation.

[0043] Advantages of the present invention:

[0044] The automatic precision detection system for this linear guide rail pair has the following advantages compared with the previous measurement methods: First, the whole testing process does not require manual tightening or loosening of the locking screws, and the measuring oil cylinder is used to replace the previous guide rail positioning bolts. Therefore, the installation work of the linear guide rail pair is made simpler and more convenient, and the alignment efficiency is improved.

[0045] Second, rely on the operation console, hydraulic fasteners and precision measurement components to cooperate to adjust the flatness of the top surface of the linear guide rail, and rely on the operation console, hydraulic telescopic parts and precision measurement components to cooperate to adjust the flatness of the side surface of the linear guide rail. The whole alignment process is simpler and more efficient, greatly improving the alignment efficiency.

[0046] Third, after the levelness of the top surface of the linear guide rail is adjusted, the tensile forces applied by all the lower oil cylinders to the locking screws are recorded. After the levelness of the side surface of the linear guide rail is adjusted, the pressure values applied by all the hydraulic telescopic parts to the side surface of the linear guide rail are recorded. Then, record the tensile force values applied by each lower oil cylinder to the locking screw and the pressure values applied by each hydraulic telescopic part to the side surface of the linear guide rail in a booklet in the product installation manual. In this way, during the subsequent actual installation of this linear guide rail pair, the installation workers can use a torque wrench to install and assemble the corresponding screws according to the data recorded in this manual to quickly calibrate the flatness of the top surface of the linear guide rail and use a torque wrench to accurately install the guide rail positioning bolts to quickly calibrate the flatness of the top surface of the linear guide rail. It can be installed successfully at one time, saving the alignment time of the linear guide rail installation and improving the installation efficiency, without the need to use a level or micrometer again. Description of the Drawings

[0047] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0048] Figure 1 Schematic diagram provided by an embodiment of the present invention;

[0049] Figure 2 Stereogram of the automatic detection platform provided by an embodiment of the present invention;

[0050] Figure 3 Front view of the automatic detection platform provided by an embodiment of the present invention;

[0051] Figure 4 Provided by an embodiment of the present invention Figure 3 Cross-sectional view taken along A-A in

[0052] Figure 5 Provided by an embodiment of the present invention Figure 4 Enlarged view of part D in

[0053] Figure 6 Structural diagram of the lower oil cylinder, pull rod and locking screw provided by an embodiment of the present invention;

[0054] Figure 7 Structural diagram of the linear module mechanism, hydraulic slider clamping part and linear guide pair provided by an embodiment of the present invention;

[0055] Figure 8 Provided by an embodiment of the present invention Figure 7 Enlarged view of part E in

[0056] Figure 9 Provided by an embodiment of the present invention Figure 3 Cross-sectional view taken along B-B in

[0057] Figure 10 Provided by an embodiment of the present invention Figure 9 Enlarged view of part F in

[0058] Figure 11 Provided by an embodiment of the present invention Figure 3 Cross-sectional view taken along C-C in

[0059] Figure 12 Provided by an embodiment of the present invention Figure 11 Enlarged view of part G in

[0060] Icons: 1. Operating table; 2. Printer; 3. Hydraulic station; 4. Automatic detection platform; 401. Installation groove; 402. Side plate; 403. Lateral installation surface; 5. Saddle seat; 501. Air-floating slider; 6. Lead screw; 7. First motor; 8. Linear guide flatness measurement mechanism; 801. Second motor; 802. First threaded rod; 803. Moving seat; 804. Hanger; 805. First digital display three-point contact measurement device; 806. Third motor; 807. Second threaded rod; 808. Lifting seat; 809. Connecting frame; 810. Second digital display three-point contact measurement device; 9. Slider flatness measurement mechanism; 901. Third digital display three-point contact measurement device; 902. Fourth digital display three-point contact measurement device; 10. Air-floating guide rail; 11. Linear module mechanism; 111. Moving block; 12. Hydraulic telescopic part; 121. Side oil cylinder; 122. Top head; 13. Linear guide; 14. Slider; 15. Hydraulic fastener; 151. Lower oil cylinder; 152. Pull rod; 153. Locking screw; 154. Fixed column; 155. Locking block; 156. Misalignment hole; 16. Hydraulic slider clamping part; 161. Mounting seat; 162. Slider locking oil cylinder; 163. Fixed plate; 164. Limit piece. Detailed implementation mode

[0061] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0062] Embodiment 1:

[0063] As Figures 1 - 12 shown, Embodiment 1 of the present invention provides an automatic detection system for the accuracy of a linear guide pair. The linear guide pair includes a linear guide 13 and a slider 14. The detection system includes an operating table 1, an automatic detection platform 4, and an accuracy measurement component for measuring the accuracy of the linear guide pair;

[0064] The detection table surface of the automatic detection platform 4 is provided with an installation station extending in the first direction, and a plurality of through holes are arranged along the first direction on the installation station; a plurality of installation grooves 401 corresponding to the through holes one by one are arranged on the automatic detection platform 4. The installation grooves 401 extend in the second direction, and the through holes are communicated with the corresponding installation grooves 401;

[0065] A hydraulic fastener 15 is installed in each installation groove 401. The hydraulic fastener 15 includes a locking screw 153 and a lower oil cylinder 151. The lower oil cylinder 151 is used to pull down the locking screw 153 located in the installation counterbore of the linear guide 13 according to the instruction of the operating table 1 to adjust the flatness of the top surface of the linear guide 13;

[0066] On one side of the installation station, there are multiple hydraulic telescopic members 12 arranged along the first direction. The hydraulic telescopic members 12 are used to apply pressure to the side of the linear guide 13 according to the instructions of the operating table 1 to adjust the flatness of the side of the linear guide 13; the first direction is perpendicular to the second direction.

[0067] It should be noted that when actually installing the linear guide pair, adjusting the levelling of the top surface and side surface of the guide by adjusting the assembly screws and guide positioning bolts is a key step to ensure the accuracy of the guide. The following is the specific adjustment method:

[0068] Adjust the levelling of the top surface of the guide:

[0069] Preliminarily fix the guide: First, use the assembly screws to roughly fix the bottom reference surface of the guide on the bottom assembly surface of the bed, noting not to fully tighten the screws for subsequent adjustment.

[0070] Measure the levelling: Place the spirit level on the top surface of the guide and measure it at the middle position and both ends of the guide respectively, record the readings of the spirit level, or use a dial indicator or micrometer to move along the length direction of the guide to measure the levelling of the top surface of the guide.

[0071] Adjust the assembly screws: According to the readings of the spirit level, adjust the levelling of the top surface of the guide by adjusting the assembly screws. If the reading at a certain part of the guide is too high or too low, appropriately tighten or loosen the corresponding assembly screws to make the top surface of the guide reach the horizontal state.

[0072] Gradually tighten the screws: During the adjustment process, gradually tighten the assembly screws to ensure that the guide remains stable during the adjustment. It is usually recommended to gradually tighten the screws from the middle to both ends of the guide to avoid deformation of the guide.

[0073] Recheck the levelling: After the adjustment is completed, use the spirit level to measure the top surface of the guide again to ensure that its levelling meets the requirements. If necessary, repeat the above adjustment steps until a satisfactory levelling is achieved.

[0074] Adjust the levelling of the side surface of the guide:

[0075] Use a vice or fixture to fix: After preliminarily fixing the bottom of the guide, use a vice or special fixture to gently press the side reference surface of the guide against the side assembly surface of the bed to determine the side position of the guide.

[0076] Measure the side levelling: Place the spirit level or dial indicator on the side reference surface of the guide and move the spirit level or dial indicator along the length direction of the guide to measure the levelling of the side surface of the guide.

[0077] Adjust the positioning bolt: According to the measurement results, adjust the levelness of the guide rail side by adjusting the guide rail positioning bolt. If the reading at a certain part of the guide rail side is too high or too low, appropriately tighten or loosen the corresponding positioning bolt to make the guide rail side reach the horizontal state.

[0078] Gradually tighten the bolt: During the adjustment process, gradually tighten the positioning bolt to ensure that the side of the guide rail is closely fitted with the assembly surface of the bed table side. It is usually recommended to gradually tighten the bolts from one end of the guide rail to the other end to ensure the flatness of the guide rail side.

[0079] Recheck the side levelness: After the adjustment is completed, use a level or micrometer to measure the guide rail side again to ensure that its levelness meets the requirements. If necessary, repeat the above adjustment steps until a satisfactory levelness is achieved.

[0080] In the above alignment steps of the guide rail, it is necessary to loosen or tighten the assembly screws according to the measurement results of the level, and tighten the guide rail positioning bolts according to the measurement results of the level or micrometer. The entire alignment process is rather cumbersome and inefficient.

[0081] In contrast, when using the automatic detection system for the precision of this linear guide rail pair to align the precision, the following steps are included:

[0082] First, place the linear guide rail pair on the installation station of the automatic detection platform 4, so that the side of the linear guide rail 13 is against the lateral installation surface 403 of the installation station. Then, sequentially place the locking screws 153 into the installation counterbores of the linear guide rail 13, and connect the locking screws 153 with the lower oil cylinders 151. Then, the operation console 1 controls multiple lower oil cylinders 151 to synchronously shorten the set length m1 to pull down the locking screws 153 located in the installation counterbores of the linear guide rail 13. The top of the locking screw 153 presses in the installation counterbore of the linear guide rail 13, and multiple locking screws 153 act on the linear guide rail 13 with the same pressure to initially install the linear guide rail 13 on the installation station. Note that the locking screws 153 are not fully locked in this process for subsequent adjustment.

[0083] Next, use the precision measurement component to move along the length direction of the linear guide 13 to measure the flatness of the top surface of the linear guide 13. When the displacement at a certain position on the top surface of the linear guide 13 is greater than the set range, control the lower oil cylinder 151 at this position to continue shortening by a fixed length, increase the downward pulling force on the locking screw 153, and then continue to measure the displacement at this coordinate. If it is still greater than the set range, continue to increase the downward pulling force on the locking screw 153 until the displacement at this coordinate meets the set range. If the displacement at a certain position on the top surface of the linear guide 13 is less than the set range, control the lower oil cylinder 151 at this position to extend by a fixed length, reduce the downward pulling force on the locking screw 153, and then continue to measure the displacement at this coordinate. If it is still less than the set range, continue to reduce the downward pulling force on the locking screw 153 until the displacement at this coordinate meets the set range. Adjust the levelness of the top surface of the linear guide 13 in this way.

[0084] After the levelness of the top surface of the linear guide 13 is adjusted, record the pulling forces applied by all the lower oil cylinders 151 to the locking screws 153.

[0085] Next, the operating platform 1 controls all the lower oil cylinders 151 to extend by a set length m2 to appropriately loosen the locking screws 153 to facilitate the lateral adjustment of the linear guide 13; then controls all the hydraulic telescopic members 12 to extend by a set length m3 so that the linear guide 13 is pressed against the lateral mounting surface 403 of the mounting station.

[0086] Next, use the precision measurement component to move along the length direction of the linear guide 13 to measure the flatness of the side surface of the linear guide 13; when the displacement at a certain position on the side surface of the linear guide 13 is greater than the set range, control the hydraulic telescopic member 12 at this position to continue extending by a fixed length, increase the pressure on the side surface of the linear guide 13, and then continue to measure the displacement at this position. If it is still greater than the set range, continue to increase the pressure on the side surface of the linear guide 13 until the displacement at this position meets the set range. If the displacement at a certain position on the side surface of the linear guide 13 is less than the set range, control the hydraulic telescopic member 12 at this position to shorten by a fixed length, reduce the pressure on the side surface of the linear guide 13, and then continue to measure the displacement at this position. If it is still less than the set range, continue to reduce the pressure on the side surface of the linear guide 13 until the displacement at this position meets the set range. Adjust the levelness of the side surface of the linear guide 13 in this way. Then record the pressure values applied by all the hydraulic telescopic members 12 to the side surface of the linear guide 13.

[0087] Finally, the operating platform 1 controls all the lower oil cylinders 151 to shorten by a set length m2 to return to the state when the levelness adjustment of the top surface of the linear guide 13 is completed.

[0088] It can be seen that the automatic precision detection system for linear guide pairs has the following advantages compared with the previous measurement methods: First, during the entire testing process, there is no need to manually tighten or loosen the locking screw 153, and the side oil cylinder 121 is used to replace the previous guide rail positioning bolt. Therefore, the installation work of the linear guide pair is made simpler and more convenient, and the alignment efficiency is improved.

[0089] Second, relying on the cooperation of the operation table 1, the hydraulic fastener 15, and the precision measurement component to adjust the flatness of the top surface of the linear guide 13, and relying on the cooperation of the operation table 1, the hydraulic telescopic member 12, and the precision measurement component to adjust the flatness of the side surface of the linear guide. The entire alignment process is simpler and more efficient, greatly improving the alignment efficiency.

[0090] Third, after the levelness of the top surface of the linear guide 13 is adjusted, the pulling force exerted by all the lower oil cylinders 151 on the locking screw 153 is recorded. After the levelness of the side surface of the linear guide 13 is adjusted, the pressure values exerted by all the hydraulic telescopic members 12 on the side surface of the linear guide 13 are recorded. Then, the pulling force values exerted by each lower oil cylinder 151 on the locking screw 153 and the pressure values exerted by each hydraulic telescopic member 12 on the side surface of the linear guide 13 are recorded in a booklet in the product installation manual. In this way, when the linear guide pair is actually installed in subsequent products, the installation workers can, according to the data recorded in the manual, use a torque wrench to install and assemble the corresponding screws to quickly calibrate the flatness of the top surface of the linear guide 13 and use a torque wrench to accurately install the guide rail positioning bolt to quickly calibrate the flatness of the top surface of the linear guide 13. It can be installed successfully at one time, saving the installation and alignment time of the linear guide 13, improving the installation efficiency, and eliminating the need to use a level or micrometer.

[0091] In this embodiment, the above-mentioned first direction is the length direction of the automatic detection platform 4, and the second direction is the width direction of the automatic detection platform 4.

[0092] In this embodiment, as Figure 1 and Figure 5 shown, the installation station is located on one side of the top surface of the automatic detection platform 4. The installation station includes a connected lateral installation surface 403 and an installation bottom surface. The installation bottom surface is perpendicular to the lateral installation surface 403. The lateral installation surface 403 is connected to the top surface of the automatic detection platform 4, and the top surface of the automatic detection platform 4 is higher than the installation bottom surface. When installing the linear guide pair on the detection platform, the bottom surface of the linear guide 13 is placed on the installation bottom surface, and the side surface of the linear guide 13 is attached to the lateral installation surface 403.

[0093] The above through holes are provided on the installation bottom surface, and a plurality of through holes are arranged uniformly along the length direction of the installation bottom surface. The installation groove 401 is located on the side surface of the automatic detection platform 4, and a plurality of installation grooves 401 are arranged uniformly along the length direction of the automatic detection platform 4. The depth direction of the installation groove 401 is the same as the width direction of the automatic detection platform 4, and the installation groove 401 is lower than the installation bottom surface. The installation grooves 401, the through holes on the installation bottom surface, and the installation counterbores on the linear guide 13 are in one-to-one correspondence, and the installation groove 401 and the corresponding through hole are communicated with each other.

[0094] As a preferred embodiment, a hydraulic fastener 15 is installed in each installation groove 401. The hydraulic fastener 15 includes a lower oil cylinder 151, a pull rod 152, and a locking screw 153. Among them, the lower oil cylinder 151 is fixedly installed on the inner top wall of the installation groove 401. The pull rod 152 is a cylinder, and the pull rod 152 is connected to the cylinder end of the lower oil cylinder 151. The pull rod 152 and the locking screw 153 are detachably connected through a quick connection mechanism. Further, the quick connection mechanism includes a block structure and a slot structure. Specifically, the block structure is provided at the bottom end of the locking screw 153, and the slot structure is provided at the top end of the pull rod 152.

[0095] More specifically, as Figure 6 shown, the block structure includes a fixed column 154 provided at the bottom end of the locking screw 153 and a plurality of locking blocks 155. The fixed column 154 and the locking screw 153 are coaxially arranged, and the diameter of the fixed column 154 is smaller than the diameter of the locking screw 153. The locking blocks 155 are fixed on the side surface of the fixed column 154 close to its bottom surface, and the plurality of locking blocks 155 are arranged uniformly around the axis of the fixed column 154.

[0096] The slot structure includes a circular groove opened at the top end of the pull rod 152. The circular groove is coaxially arranged with the pull rod 152.

[0097] A plurality of offset holes 156 are opened on the side wall of the pull rod 152 around its axis. The length direction of the offset holes 156 is the same as the axis direction of the pull rod 152, and the depth direction of the offset holes 156 is the same as the radial direction of the pull rod 152. The offset holes 156 and the locking blocks 155 are in one-to-one correspondence and are communicated with the circular groove. Both opposite side walls of the offset holes 156 are connected to the top surface of the pull rod 152. That is, the plurality of offset holes 156 divide the top of the pull rod 152 into a plurality of ring blocks. Further, an arc-shaped block is provided on the inner wall of each ring block. The arc-shaped block is close to the top of the ring block. The arc-shaped blocks and the locking blocks 155 are in one-to-one correspondence, and the arc-shaped blocks are located between two adjacent offset holes 156.

[0098] It should be particularly noted that the shape of the locking block 155 is generally a straight triangular block, its top surface is a plane, and its other right-angled surface is welded to the side surface of the fixed column 154. The difference between the radius of the fixed column 154 and the radius of the circular groove is greater than the length of the top surface of the locking block 155.

[0099] Thus, when connecting the pull rod 152 and the locking screw 153, first rotate the locking screw 153 by a certain angle so that the locking block 155 is directly above the offset hole 156. Then extend the lower oil cylinder 151 by a certain length so that the locking block 155 on the pull rod 152 enters the offset hole 156 at the top end of the pull rod 152, and the locking block 155 is lower than the arc-shaped block. Then turn the locking screw 153 to make it rotate, so that the locking block 155 at the bottom of the locking screw 153 rotates along the inner wall of the circular groove to directly below the arc-shaped block. After that, control the lower oil cylinder 151 to shorten to drive the pull rod 152 to move downward. Since the locking block 155 is blocked by the arc-shaped block, the top surface of the locking block 155 will finally fit onto the lower surface of the arc-shaped block. In this way, the locking state is achieved.

[0100] When it is necessary to release the locking state between the lower oil cylinder 151 and the locking screw 153, first control the lower oil cylinder 151 to extend by a certain length so that the top surface of the locking block 155 no longer closely adheres to the lower surface of the arc-shaped block. Then turn the locking screw 153 to make it rotate self - clockwise so that the locking block 155 moves away from below the arc-shaped block and aligns with the offset hole 156. Finally, control the lower oil cylinder 151 to shorten by a certain length to drive the pull rod 152 to move downward, so that the pull rod 152 is disengaged from the locking block 155 in the vertical direction. In this way, the unlocking state can be achieved.

[0101] It can be seen that in this embodiment, a simple and reliable quick - connection mechanism is designed to achieve quick locking and quick unlocking between the lower oil cylinder 151 and the locking screw 153. Moreover, by using the cooperation of the lower oil cylinder 151 and the locking screw 153, the linear guide 13 can be installed simply and quickly, without manually screwing the locking screw 153 anymore.

[0102] It should be clear that there is no internal thread on the inner wall of the installation counterbore of the linear guide 13, that is, the locking screw 153 and the installation counterbore of the linear guide 13 are not connected by threads. In this way, there is no need to manually tighten or loosen the locking screw 153, but rely on the lower oil cylinder 151 to drive the locking screw 153 to press down the linear guide 13 to fix the linear guide 13 to the installation station, which is more convenient to use.

[0103] It should be explained that the automatic detection system further includes a hydraulic station 3 located on one side of the automatic detection platform 4. The hydraulic station 3 is connected to the lower oil cylinder 151 through a pipeline. The hydraulic station 3 pressurizes the oil through a hydraulic pump, and then transports the high - pressure oil to the oil cylinder through a pipeline. The oil cylinder receives the high - pressure oil and pushes the piston to move, thereby realizing the output of mechanical energy.

[0104] It should be noted that according to F = PA, the tensile force value applied by the lower oil cylinder 151 to the locking screw 153 can be determined. Among them, P is the pressure value of the hydraulic oil in the lower oil cylinder 151, and A is the effective area of the lower oil cylinder 151. The pressure value P of the hydraulic oil in the lower oil cylinder 151 is usually provided by the hydraulic station 3, and the unit is Pascal (Pa) or megapascal (MPa). This pressure value can be directly read through the pressure gauge of the hydraulic station 3.

[0105] The effective area A of the piston is a function of the inner diameter of the oil cylinder and the diameter of the piston rod. The specific formula for A is as follows:

[0106]

[0107] Among them, D is the inner diameter of the lower oil cylinder 151, and d is the diameter of the piston rod of the oil cylinder.

[0108] According to the formula F = P×A, the theoretical tensile force applied by the lower oil cylinder 151 to the locking screw 153 can be calculated.

[0109] It should be noted that when using a torque wrench, first set the required torque value on the wrench, lock the wrench and then start tightening the bolt. When the bolt reaches the set torque value, the torque release joint will become disengaged and make a "click" sound to indicate that the predetermined torque has been reached.

[0110] In this application, the lower oil cylinder 151 and the locking screw 153 are used to adjust the levelness of the top surface of the linear guide 13. According to the calculation formula F = PA, the tensile force values applied by each lower oil cylinder 151 to the locking screw 153 can be obtained, and then the tensile force values of each lower oil cylinder 151 are recorded in the product installation manual. In this way, during the actual installation process of the linear guide 13, the worker uses the recorded tensile force values of each lower oil cylinder 151 as a reference standard, and then uses a torque wrench to set the torque value according to the recorded pressure values of each lower oil cylinder 151, so as to tighten multiple assembly screws, thereby quickly completing the adjustment work of the levelness of the top surface of the linear guide 13 and greatly improving the alignment efficiency.

[0111] In this embodiment, as Figure 5 shown, on the outer side of each installation station, that is, on the side away from the middle position of the automatic detection platform 4, a side plate 402 is installed. A plurality of round holes are evenly opened on the side plate 402 along its length direction. The round holes correspond to the hydraulic telescopic members 12 one by one, and the hydraulic telescopic members 12 are installed on the corresponding round holes.

[0112] Specifically, the hydraulic telescopic member 12 includes a side oil cylinder 121 and a top head 122. The side oil cylinder 121 is fixedly installed on the outer side surface of the side plate 402, and the cylinder end of the side oil cylinder 121 passes through the round hole on the side plate 402. The top head 122 is installed at the cylinder end of the side oil cylinder 121, and the hydraulic station 3 is connected to the side oil cylinder 121 through a pipeline. It should be clear that the projection of the top head 122 in the direction towards the linear guide 13 completely or partially falls on the side surface of the linear guide 13, so that when the side oil cylinder 121 extends to drive the top head 122 to move towards the linear guide 13, the end surface of the top head 122 will completely or partially act on the side surface of the linear guide 13.

[0113] It should be clear that both the lower oil cylinder 151 and the side oil cylinder 121 are communicatively connected to the control system of the operating table 1, and the control system controls the actions of the lower oil cylinder 151 and the side oil cylinder 121.

[0114] In this embodiment, after the level of the side surface of the linear guide 13 is adjusted, according to the above formula F = PA, the pressure value exerted by the side oil cylinder 121 on the side surface of the linear guide 13 can be calculated. In this way, all the pressure values exerted by the side oil cylinders 121 on the side surface of the linear guide 13 can be recorded and compiled into a product installation manual. When the linear guide pair is actually installed later, the worker can use the recorded pressure values exerted by each side oil cylinder 121 on the side surface of the linear guide 13 as a reference standard, and then use a torque wrench to set the torque value according to the recorded pressure values exerted by each lower oil cylinder 151 on the side surface of the linear guide 13, so as to tighten a plurality of guide positioning bolts, thereby quickly completing the adjustment work of the level of the top surface of the linear guide 13 and greatly improving the alignment efficiency.

[0115] In this embodiment, as Figure 2 shown, the precision measurement assembly includes a saddle base 5, a linear drive mechanism, at least one linear guide flatness measurement mechanism 8 and at least one slider flatness measurement mechanism 9;

[0116] Among them, the linear drive mechanism includes a first motor 7, a lead screw 6 and two air-floating guide rails 10. The air-floating guide rails 10 are installed on the top surface of the automatic detection platform 4 along the length direction, and the two air-floating guide rails 10 are arranged side by side along the width direction of the automatic detection platform 4. The saddle base 5 is fixed on the air-floating sliders 501 of the two air-floating guide rails 10.

[0117] A bearing seat is fixedly installed on the front and rear directions of the top surface of the automatic detection platform 4 respectively. The lead screw 6 is rotatably installed between the two bearing seats, and the lead screw 6 is located between the two air-floating guide rails 10. A rectangular block is fixedly installed on the bottom surface of the saddle base 5, and this rectangular block is threadedly connected to the lead screw 6. The first motor 7 is fixedly installed on the top of the automatic detection platform 4, and its output end is connected to one end of the lead screw 6. The first motor 7 is signal-connected to the control system of the operating table 1.

[0118] In this embodiment, the linear guide flatness measuring mechanism 8 and the slider flatness measuring mechanism 9 are installed on the same side of the saddle 5. The linear drive mechanism is used to drive the saddle 5 to move along the length direction of the automatic detection platform 4 according to the instruction of the operation console 1, so as to drive the linear guide flatness measuring mechanism 8 and the slider flatness measuring mechanism 9 to move simultaneously. The linear guide flatness measuring mechanism 8 is used to measure the flatness of the top surface and the side surface of the linear guide 13, and the slider flatness measuring mechanism 9 is used to measure the flatness of the top surface and the side surface of the slider 14.

[0119] In this way, the operation console 1 issues an instruction to the first motor 7 to control the first motor 7 to drive the lead screw 6 to rotate around its own axis. The lead screw 6 rotates to drive the saddle 5 to move along the length direction of the lead screw 6, so as to drive the linear guide flatness measuring mechanism 8 and the slider flatness measuring mechanism 9 to move along the length direction of the automatic detection platform 4.

[0120] It should be noted that the number of rotation turns of the first motor 7 can be directly read by the encoder. When the first motor 7 rotates a fixed number of turns, the corresponding moving distance of the saddle 5 can be calculated by the operation console 1. The position information of all the lower oil cylinders 151 and the side oil cylinders 121 on the automatic detection platform 4 is input into the calculation module in the operation console 1. The positions of the linear guide flatness measuring mechanism 8 and the slider flatness measuring mechanism 9 on the saddle 5 are fixed.

[0121] When adjusting the levelness of the top surface of the linear guide 13, the saddle 5 needs to move to the initial end of the linear guide 13. At this time, the linear guide flatness measuring mechanism 8 is located at the initial end of the linear guide 13. When starting the measurement, the operation console 1 controls the first motor 7 to start, and the saddle 5 drives the linear guide flatness measuring mechanism 8 to move towards the terminal direction of the linear guide 13.

[0122] When the displacement amount measured by the linear guide flatness measuring mechanism 8 at a certain position on the top surface of the linear guide 13 exceeds the set range, first, the operation console 1 controls the first motor 7 to pause, and obtains the number of rotation turns of the current first motor 7, so as to obtain the position information of the current linear guide flatness measuring mechanism 8, that is, how much distance the current linear guide flatness measuring mechanism 8 has moved on the linear guide 13. Subsequently, the position information of the current linear guide flatness measuring mechanism 8 is compared with the position coordinates of each lower oil cylinder 151 input in the system, and the lower oil cylinder 151 closest to the linear guide flatness measuring mechanism 8 is selected. Finally, the operation console 1 controls the lower oil cylinder 151 to shorten or extend by a set length L, so as to increase or decrease the downward pulling force on the locking screw 153, and then controls the linear guide flatness measuring mechanism 8 to measure the displacement amount at this position again. If the displacement amount measured this time meets the set range, control the first motor 7 to continue working. If it still does not meet the set range, control the lower oil cylinder 151 to continue to shorten or extend by a set length L1. Wherein L is greater than L1.

[0123] Similarly, when adjusting the levelness of the side of the linear guide 13, the specific position information of the current linear guide flatness measuring mechanism 8 is obtained by calculating the number of rotation turns of the first motor 7, and then the specific position information of the current linear guide flatness measuring mechanism 8 is compared with the position coordinates of each side oil cylinder 121 entered in the system. The side oil cylinder 121 closest to the linear guide flatness measuring mechanism 8 is selected, and finally, the side oil cylinder 121 is controlled to extend or retract to adjust the side of the linear guide 13.

[0124] In addition, a displacement sensor can be installed on the automatic detection platform 4 to measure the specific position information of the linear guide flatness measuring mechanism 8 or the slider flatness measuring mechanism 9. For example, a TR / TRS self-resetting linear displacement sensor can be used. That is, the housing of the self-resetting linear displacement sensor is installed on the detection platform along the length direction of the detection platform, and the starting end and the terminal end of the self-resetting linear displacement sensor are flush with the starting end and the terminal end of the linear guide 13 respectively. Then, the sliding brush of the self-resetting linear displacement sensor is connected to the linear guide flatness measuring mechanism 8 or the slider flatness measuring mechanism 9 through a pull rod. When the saddle 5 moves, it will drive the sliding brush to slide on the resistance element of the self-resetting linear displacement sensor, changing the resistance value, so that the moving distance of the current linear guide flatness measuring mechanism 8 or the slider flatness measuring mechanism 9 can be accurately obtained.

[0125] In addition, it should be noted that in the past, when using a micrometer to measure the levelness of the top surface or the side surface of the linear guide 13, it was necessary to manually remove the slider 14 or move it to the end of the linear guide 13 to avoid the slider 14 from obstructing the measurement.

[0126] In contrast, as Figure 6 shown, a slider moving assembly is arranged on the automatic detection platform 4 of this embodiment. As Figure 7 shown, the slider moving assembly includes a linear module mechanism 11 and a hydraulic slider clamping part 16. The linear module mechanism 11 is a linear module, and specifically, any one of a screw-driven linear module, a synchronous belt-driven linear module, and a gear-rack-driven linear module can be selected. The linear module mechanism 11 is fixedly installed on the top surface of the automatic detection platform 4 along the length direction of the automatic detection platform 4, and the installation station is located between the linear module mechanism 11 and the side plate 402.

[0127] Furthermore, the hydraulic slider clamping part 16 is installed on the moving block 111 of the linear module mechanism 11.

[0128] The hydraulic slider clamping part 16 is as Figure 8As shown, it includes a mounting base 161, a slider locking oil cylinder 162, a fixing plate 163 and two limit pieces 164. The mounting base 161 is fixedly installed on the moving block 111 by bolts or screws. The slider locking oil cylinder 162 is fixedly installed on the mounting base 161, and the slider locking oil cylinder 162 is perpendicular to the installation station or perpendicular to the linear guide 13. That is, the telescopic direction of the slider locking oil cylinder 162 is perpendicular to the moving direction of the slider 14. The fixing plate 163 is installed at the cylinder end of the slider locking oil cylinder 162, and the two limit pieces 164 are arranged along the moving direction of the slider 14 and installed on the side of the fixing plate 163 facing the slider 14.

[0129] It should be specifically noted that the slider 14 in this application is as Figure 8 shown, and it has a mounting metal plate thereon, and the mounting metal plate protrudes from the top surface of the slider 14 body. The distance between the two limit pieces 164 is not less than the distance between the front and rear end faces of the mounting metal plate. In addition, for some sliders 14 on the market, the mounting metal plate does not protrude from the top surface of the slider body. In this case, the distance between the two limit pieces 164 needs to be not less than the length of the slider 14. Of course, in this embodiment, the distance between the two limit pieces 164 can also be set to be not less than the length of the slider 14.

[0130] In this way, when it is necessary to change the position of the slider 14 on the linear guide 13, manually push the moving block 111 on the linear module mechanism 11 to drive the hydraulic slider clamping member 16 close to the slider 14, and finely adjust the position of the moving block 111 so that the hydraulic slider clamping member 16 is directly facing the slider 14. Then the operation platform 1 controls the slider locking oil cylinder 162 to extend a certain length until the front and rear end faces of the mounting metal plate are located between the two limit pieces 164. Subsequently, the operation platform 1 controls the linear module mechanism 11, and the moving block 111 on the linear module mechanism 11 drives the hydraulic slider clamping member 16 to move. Since the limit piece 164 blocks the slider 14, the slider 14 will be driven to move on the linear guide 13.

[0131] In this embodiment, it should be noted that the structures of the linear guide flatness measuring mechanism 8 and the slider flatness measuring mechanism 9 are generally the same, only the dimensions of some structures are slightly different. To avoid redundancy, the linear guide flatness measuring mechanism 8 will be described in detail first, and then the differences between the slider flatness measuring mechanism 9 and the linear guide flatness measuring mechanism 8 will be described.

[0132] As Figure 9 and Figure 10As shown in the figure, the linear guide flatness measuring mechanism 8 in this embodiment includes an X-axis moving mechanism, a Z-axis moving mechanism, a first digital display three-point contact measuring device 805, and a second digital display three-point contact measuring device 810. The Z-axis moving mechanism is vertically arranged on the saddle 5, and the second digital display three-point contact measuring device 810 is installed on the Z-axis moving mechanism. The Z-axis moving mechanism is used to drive the second digital display three-point contact measuring device 810 to move up and down to approach or move away from the top surface of the linear guide 13. The X-axis moving mechanism is installed on the saddle 5 along the width direction of the automatic detection platform 4, and the first digital display three-point contact measuring device 805 is installed on the X-axis moving mechanism. The X-axis moving mechanism is used to drive the first digital display three-point contact measuring device 805 to move along the width direction of the automatic detection platform 4 to approach or move away from the side surface of the linear guide 13.

[0133] Among them, the X-axis moving mechanism includes a mounting base, a second motor 801, a first threaded rod 802, a moving seat 803, and a hanging bracket 804. The mounting base is installed on the saddle 5 along the length direction of the saddle 5. The first threaded rod 802 is rotatably installed on the mounting base. The moving seat 803 is slidably connected to the mounting base and is threadedly connected to the first threaded rod 802. The top end of the hanging bracket 804 is fixedly connected to the moving seat 803, and the other end is located outside the installation station. The hanging bracket 804 is an L-shaped plate, which includes a first plate body and a second plate body that are perpendicular to each other. The first plate body is fixedly connected to the moving seat 803, the first plate body is parallel to the saddle 5, and the second plate body is in a vertical state. The first digital display three-point contact measuring device 805 is installed at the bottom end of the second plate body. The second motor 801 is installed at the end of the mounting base, and the output end of the second motor 801 is connected to the first threaded rod 802.

[0134] Specifically, the Z-axis moving mechanism includes a vertical frame, a second threaded rod 807, a lifting seat 808, a connecting frame 809, and a third motor 806. The vertical frame is vertically and fixedly installed on the saddle 5. The second threaded rod 807 is vertically and rotatably installed on the vertical frame. The lifting seat 808 is slidably connected to the vertical frame and is threadedly connected to the second threaded rod 807. The connecting frame 809 is fixedly connected to the lifting seat 808. The connecting frame 809 includes a first plate body and a second plate body that are perpendicular to each other. The first plate body is fixedly connected to the lifting seat 808, and the second plate body is parallel to the installation station. The above-mentioned second digital display three-point contact measuring device 810 is installed on the second plate body and is located directly above the installation station. The third motor 806 is installed at the top end of the vertical frame, and the output end of the third motor 806 is connected to the second threaded rod 807.

[0135] Thus, when it is necessary to measure the levelness of the top surface of the linear guide 13, the operation console 1 controls the third motor 806 to drive the second threaded rod 807 to rotate self - sufficiently, so that the lifting seat 808 drives the second digital display three - point contact measuring device 810 to descend together and approach the top surface of the linear guide 13. When the three measuring heads on the second digital display three - point contact measuring device 810 contact the top surface of the linear guide 13, the third motor 806 stops working. Then the operation console 1 controls the first motor 7 to start, and the saddle seat 5 drives the linear guide flatness measuring mechanism 8 to move along the length direction of the linear guide 13, so that the three measuring heads on the second digital display three - point contact measuring device 810 move along the length direction of the linear guide 13 for measurement.

[0136] When it is necessary to measure the levelness of the side surface of the linear guide 13, the operation console 1 controls the second motor 801 to drive the first threaded rod 802 to rotate self - sufficiently, so as to drive the hanging bracket 804 and the first digital display three - point contact measuring device 805 to move horizontally towards the linear guide 13 until the three measuring heads of the first digital display three - point contact measuring device 805 are attached to the side surface of the linear guide 13. Subsequently, the operation console 1 controls the first motor 7 to start, and the saddle seat 5 drives the linear guide flatness measuring mechanism 8 to move along the length direction of the linear guide 13, so that the three measuring heads on the first digital display three - point contact measuring device 805 move along the length direction of the linear guide 13 for measurement.

[0137] As Figure 11 and Figure 12 shown, the slider flatness measuring mechanism 9 includes an X - axis moving mechanism, a Z - axis moving mechanism, a third digital display three - point contact measuring device 901 and a fourth digital display three - point contact measuring device 902. Among them, the X - axis moving mechanism has the same structure as the X - axis moving mechanism in the above - mentioned linear guide flatness measuring mechanism 8, and the only difference is that the size of the hanging bracket 804 in this X - axis moving mechanism is smaller than that of the hanging bracket 804 in the X - axis moving mechanism of the linear guide flatness measuring mechanism 8. Similarly, this Z - axis moving mechanism has the same structure as the Z - axis moving mechanism in the linear guide flatness measuring mechanism 8, and the only difference is that the stroke of this Z - axis moving mechanism is smaller than that of the Z - axis moving mechanism in the above - mentioned linear guide flatness measuring mechanism 8. The third digital display three - point contact measuring device 901 in this embodiment is installed at the bottom end of the hanging bracket 804 in this X - axis moving mechanism. This fourth digital display three - point contact measuring device 902 is installed on the connecting frame 809 of the Z - axis moving mechanism. To avoid redundancy, the slider flatness measuring mechanism 9 will not be described in detail.

[0138] For the convenience of distinction, the X - axis moving mechanism and the Z - axis moving mechanism in the linear guide flatness measuring mechanism 8 are respectively named the first X - axis moving mechanism and the first Z - axis moving mechanism. The X - axis moving mechanism and the Z - axis moving mechanism in the slider flatness measuring mechanism 9 are respectively named the second X - axis moving mechanism and the second Z - axis moving mechanism.

[0139] Optionally, as Figure 2 shown, there are two installation stations in this application, which are respectively located on both sides of the automatic detection platform 4. Correspondingly, there are also two linear module mechanisms 11. One linear module mechanism 11 is provided on one side of each installation station. A set of linear guide flatness measurement mechanisms 8 and slider flatness measurement mechanisms 9 are respectively installed at both ends of the saddle 5. In this way, the accuracy of two linear guide pairs can be measured synchronously.

[0140] In this embodiment, as Figure 1 shown, the automatic detection system further includes a printer 2 placed on the top of the operating table 1. After the operating table 1 receives the data fed back by the lower oil cylinder 151, the side oil cylinder 121, the linear guide flatness measurement mechanism 8 and the slider flatness measurement mechanism 9, it prints them out through the printer 2.

[0141] It should be noted that in the past, when using a dial indicator or a micrometer to measure the flatness of a guide rail, the value measured by the dial indicator or the micrometer represents the relative displacement of the guide rail surface at the measurement point in the vertical direction relative to the reference plane. This displacement reflects the flatness of the guide rail surface, that is, the flatness error.

[0142] By measuring the displacement of multiple points and recording the maximum and minimum values, the maximum error of the guide rail flatness can be calculated. For example, if during the measurement process, the readings of the dial indicator vary between 0.00 mm and 0.05 mm, then the maximum flatness error of the guide rail is 0.05 mm. In addition, when the pointer of the dial indicator or the micrometer rotates clockwise, it means that the height of the measurement point relative to the reference plane increases, that is, the measurement point is higher than the reference plane, and the value is positive. When the pointer of the dial indicator or the micrometer rotates counterclockwise, it means that the height of the measurement point relative to the reference plane decreases, that is, the measurement point is lower than the reference plane, and the value is negative.

[0143] For easy understanding, an example is given below: Suppose when measuring the flatness of a certain guide rail, the measuring head of the dial indicator is perpendicular to the guide rail surface and measurements are taken at different positions on the guide rail. If at a certain measurement point, the reading of the dial indicator is +0.03 mm, it means that this point is 0.03 mm higher than the reference plane; while at another measurement point, the reading is -0.02 mm, which means that this point is 0.02 mm lower than the reference plane.

[0144] By recording and analyzing the values of these measurement points, the contour curve of the guide rail surface can be drawn, and then it can be evaluated whether the flatness of the guide rail meets the design requirements.

[0145] It should be clear that this application is different from the conventional measurement method using a single dial indicator or a single micrometer. The digital three-point contact measurement device in this application includes three high-precision contact digital sensors, which are distributed in a triangular pattern. The three-point plane determination method, that is, the face-to-face measurement method, truly realizes the detection of the parallelism between surfaces, making the detection data more real and scientific.

[0146] Optionally, the high-precision contact digital sensor is the Keyence GT2 series. It adopts a new principle grating scale pulse system, uses a super-clear CMOS sensor for high-speed shooting, and reads its movement amount from the "absolute value scale" engraved with a slit pattern that varies according to position. It has the same-level ultra-high precision, and an advanced detection principle that does not generate tracking errors even when moving at high speed. It achieves the same-level ultra-high precision, with a resolution of 0.1μm and an accuracy of 1μm. It also has a long service life with a detection duration of more than 200 million times, which can reduce the maintenance man-hours caused by the damage of the sensor head. In addition, it supports a rich open field network. It can also be used in conjunction with software. The data measured by the high-precision contact digital sensor can be transmitted to the operation console 1 in real time and displayed through the software in the computer of the operation console 1.

[0147] Embodiment 2:

[0148] Embodiment 2 of the present invention provides a method for detecting the accuracy of a linear guide pair, including:

[0149] The first step: Place the linear guide pair to be detected on the installation station of the automatic detection platform 4, then put the locking screws 153 into each installation counterbore of the linear guide 13 and rotate a certain angle so that the chuck structure at the bottom of the locking screw 153 is engaged with the slot structure on the pull rod 152 of the lower oil cylinder 151. Then, the operation console 1 synchronously controls a plurality of lower oil cylinders 151 to shorten a set length to pull down the locking screw 153 with a fixed pulling force F, and preliminarily assemble the linear guide pair to be detected on the installation station.

[0150] The second step: Control the linear drive mechanism to drive the saddle 5 to move to the first end of the linear guide 13. The operation console 1 controls the linear module mechanism 11 to drive the hydraulic slider clamping member 16 close to the slider 14, and then controls the slider locking oil cylinder 162 to extend a set length to clamp the slider 14. Then, the operation console 1 controls the linear module mechanism 11 to drive the slider 14 to move to the second end of the linear guide 13.

[0151] The third step: Control the first Z-axis movement mechanism in the linear guide flatness measurement mechanism 8 to start, so that the second digital three-point contact measurement device 810 fits onto the top surface of the linear guide 13, and control the linear drive mechanism to drive the saddle 5 to slowly move towards the second end of the linear guide 13 at a set speed.

[0152] When the reading of the second digital three-point contact measuring device 810 exceeds the set deviation range, mark the coordinates at that place, and the operating platform controls the lower oil cylinder 151 at that coordinate to correspondingly increase or decrease the downward pulling force on the locking screw 153. Then continue to measure the displacement at that coordinate. If it still exceeds the set deviation range, continue to increase or decrease the downward pulling force on the locking screw 153 until the displacement at that coordinate meets the set deviation range;

[0153] When the second digital three-point contact measuring device 810 moves to the second end of the linear guide 13, the operating platform 1 records all the pulling force values exerted by the lower oil cylinders 151 on the locking screw 153, and then controls the linear drive mechanism to drive the saddle 5 back to the first end of the linear guide 13.

[0154] Fourth step: Control the first X-axis moving mechanism and the first Z-axis moving mechanism in the linear guide flatness measuring mechanism 8 to start, so that the first digital three-point contact measuring device 805 and the second digital three-point contact measuring device 810 are respectively attached to the side surface and the top surface of the linear guide 13;

[0155] Then start the linear drive mechanism to drive the saddle 5 to approach the slider 14. After the slider flatness measuring mechanism 9 reaches the specified position, control the second X-axis moving mechanism and the second Z-axis moving mechanism in the slider flatness measuring mechanism 9 to start to adjust the positions of the third digital three-point contact measuring device 901 and the fourth digital three-point contact measuring device 902, so that the third digital three-point contact measuring device 901 and the fourth digital three-point contact measuring device 902 are respectively attached to the side surface and the top surface of the slider 14.

[0156] Fifth step: Start the first precision detection. Control the linear drive mechanism to drive the saddle 5 to move a set distance at a set speed, and use the second digital three-point contact measuring device 810 and the fourth digital three-point contact measuring device 902 to measure the parallelism deviation data of the top surface of the linear guide 13 relative to the top surface of the slider 14; use the first digital three-point contact measuring device 805 and the third digital three-point contact measuring device 901 to measure the parallelism deviation data of the side surface of the linear guide 13 relative to the side surface of the slider 14, and compare with the allowable deviation in the national standard to evaluate the precision grade of this linear guide pair.

[0157] Sixth step: The operating platform controls all the lower oil cylinders 151 to extend a set length m2 to facilitate the lateral adjustment of the linear guide 13.

[0158] Seventh step: Control all the side oil cylinders 121 to extend a set length so that the linear guide 13 is pressed onto the lateral installation surface 403 of the installation station, and then control the first X-axis moving mechanism in the linear guide flatness measuring mechanism 8 to start, so that the first digital three-point contact measuring device 805 is attached to the side surface of the linear guide 13;

[0159] Control the linear drive mechanism to drive the saddle 5 to slowly move towards the second end of the linear guide 13 at a set speed; when the reading of the first digital three-point contact measuring device 805 exceeds the set deviation range, mark the coordinates at this point, and the operating platform controls the side oil cylinder 121 at this coordinate to increase or decrease the tightening force on the side of the linear guide 13, and then continue to measure the displacement at this coordinate. If it still exceeds the set deviation range, continue to increase or decrease the tightening force on the side of the linear guide 13 until the displacement at this coordinate meets the set deviation range;

[0160] After the first digital three-point contact measuring device 805 moves to the second end of the linear guide 13, the operating platform 1 automatically records all the pressure values applied by the side oil cylinders 121 to the linear guide 13, and then controls the linear drive mechanism to drive the saddle 5 back to the first end of the linear guide 13.

[0161] Eighth step: Control all the lower oil cylinders 151 to shorten by a set length m2.

[0162] Ninth step: Start the second precision detection: Measure the parallelism deviation data of the top surface of the linear guide 13 relative to the top surface of the slider 14 and the parallelism deviation data of the side surface of the linear guide 13 relative to the side surface of the slider 14 according to the method recorded in the fifth step, align with the allowable deviation in the national standard, and evaluate the precision level of the linear guide pair in the actual installation state. Finally, the operating platform 1 records again all the pulling force values applied by the lower oil cylinders 151 to the locking screws 153 and all the pressure values applied by the side oil cylinders 121 to the linear guide 13, and record all the pulling force values applied by the lower oil cylinders 151 to the locking screws 153 and all the pressure values applied by the side oil cylinders 121 to the linear guide 13 in a booklet in the specification for reference during subsequent actual installation.

[0163] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0164] In the description of the present invention, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the connection inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise stated, the meaning of "a plurality of" is two or more than two.

[0165] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A linear guide pair precision automatic detection system, the linear guide pair comprising a linear rail (13) and a slider (14), characterized in that: The detection system comprises an operating table (1), an automatic detection platform (4), and a precision measurement component for measuring the precision of a linear guide pair; The detection table of the automatic detection platform (4) is provided with an installation station extending along a first direction, and the installation station is provided with a plurality of through holes arranged along the first direction; the automatic detection platform (4) is provided with a plurality of installation grooves (401) corresponding to the through holes one by one, the installation grooves (401) extending along a second direction, and the through holes are connected to the corresponding installation grooves (401); A hydraulic fastener (15) is installed in each of the installation grooves (401), the hydraulic fastener (15) comprising a locking screw (153) and a lower oil cylinder (151), the lower oil cylinder (151) being used to pull down the locking screw (153) located in the installation countersunk hole of the linear rail (13) according to the instruction of the operating platform (1) to adjust the flatness of the top surface of the linear rail (13); A plurality of hydraulic telescopic components (12) arranged along a first direction are provided on one side of the installation station, and the hydraulic telescopic components (12) are used to apply pressure to the side of the linear rail (13) according to the instruction of the operating table (1) to adjust the flatness of the side of the linear rail (13); the first direction and the second direction are perpendicular; The cylinder end of the lower oil cylinder (151) is connected to a pull rod (152), the bottom end of the locking screw (153) is provided with a block structure, and the end of the pull rod (152) away from the lower oil cylinder (151) is provided with a slot structure used in conjunction with the block structure; When the locking screw (153) is rotated to a first state, the block structure and the slot structure are engaged with each other; when the locking screw (153) is rotated to a second state, the block structure and the slot structure are separated.

2. The linear guideway pair precision automatic detection system according to claim 1, characterized in that: The precision measurement assembly comprises a sliding saddle (5), a linear drive mechanism, at least one linear rail flatness measurement mechanism (8) and at least one slider flatness measurement mechanism (9); The sliding saddle (5) is slidably mounted on the detection table of the automatic detection platform (4); the linear rail flatness measuring mechanism (8) and the slider flatness measuring mechanism (9) are mounted on the same side of the sliding saddle (5); the linear drive mechanism is used to drive the sliding saddle (5) to move along a first direction according to the instruction of the operating table (1); the linear rail flatness measuring mechanism (8) is used to measure the flatness of the top and side surfaces of the linear rail (13); and the slider flatness measuring mechanism (9) is used to measure the flatness of the top and side surfaces of the slider (14).

3. The linear guideway pair precision automatic detection system according to claim 1 is characterized in that: The clamping block structure comprises a fixing column (154) provided at the bottom end of the locking screw (153) and a plurality of locking blocks (155), wherein the plurality of locking blocks (155) are evenly arranged around the axis of the fixing column (154); The slot structure comprises a circular slot formed at the top end of the pull rod (152); a plurality of staggered holes (156) are formed on the side wall of the pull rod (152) around its axis; the staggered holes (156) correspond to the locking blocks (155) one by one and are connected to the circular slot; the depth direction of the staggered holes (156) is the same as the radial direction of the pull rod (152); the inner wall of the staggered holes (156) is connected to the top surface of the pull rod (152); a plurality of arc blocks corresponding to the locking blocks (155) one by one are formed on the inner wall of the circular slot near the top; the arc blocks are located between two adjacent staggered holes (156); When the locking screw (153) is rotated to a first state, the locking block (155) is located directly below the corresponding arc block; when the locking screw (153) is rotated to a second state, the locking block (155) and the corresponding arc block are staggered in the horizontal direction.

4. The linear guideway pair precision automatic detection system according to claim 1, characterized in that: The hydraulic telescopic member (12) comprises a side oil cylinder (121) and a ram (122); a side plate (402) extending along a first direction is provided on the detection table of the automatic detection platform (4); the side plate (402) is located outside the installation station; the side oil cylinder (121) is fixedly mounted on the side plate (402); and the ram (122) is mounted on a cylinder end of the side oil cylinder (121) and points to the side of the linear rail (13).

5. The linear guideway pair precision automatic detection system according to claim 2, characterized in that: Comprising at least one linear module mechanism (11) and at least one hydraulic slide clamp (16), wherein the linear module mechanism (11) is mounted on the detection table along a first direction, and the hydraulic slide clamp (16) is mounted on a moving block (111) of the linear module mechanism (11); The hydraulic slider clamp (16) comprises a slider locking cylinder (162), a fixing plate (163) and two limiting plates (164); the slider locking cylinder (162) extends along the second direction; the fixing plate (163) is mounted on the cylinder end of the slider locking cylinder (162); the two limiting plates (164) are arranged along the first direction and are mounted on a surface of the fixing plate (163) facing the slider (14); the slider (14) has a first end face and a second end face that are parallel to each other along the first direction; and the distance between the two limiting plates (164) is not less than the distance between the first end face and the second end face.

6. The linear guideway pair precision automatic detection system according to claim 2, characterized in that: The linear rail flatness measuring mechanism (8) comprises a first X-axis moving mechanism, a first Z-axis moving mechanism, a first digital display three-point contact measuring device (805) and a second digital display three-point contact measuring device (810), wherein the first Z-axis moving mechanism is vertically arranged on the sliding saddle (5), the second digital display three-point contact measuring device (810) is installed on the first Z-axis moving mechanism, the first Z-axis moving mechanism is used to drive the second digital display three-point contact measuring device (810) to move up and down to approach or move away from the top surface of the linear rail (13), the first X-axis moving mechanism is installed on the sliding saddle (5) extending along a second direction, the first digital display three-point contact measuring device (805) is installed on the first X-axis moving mechanism, and the first X-axis moving mechanism is used to drive the first digital display three-point contact measuring device (805) to move along the second direction to approach or move away from the side surface of the linear rail (13).

7. The linear guideway pair precision automatic detection system according to claim 6, characterized in that: The slider flatness measuring mechanism (9) comprises a second X-axis moving mechanism, a second Z-axis moving mechanism, a third digital display three-point contact measuring device (901) and a fourth digital display three-point contact measuring device (902), wherein the second Z-axis moving mechanism is vertically arranged on the slide saddle (5), the fourth digital display three-point contact measuring device (902) is mounted on the second Z-axis moving mechanism, the second Z-axis moving mechanism is used to drive the fourth digital display three-point contact measuring device (902) to move up and down so as to approach or move away from the top surface of the slider (14), the second X-axis moving mechanism is installed on the slide saddle (5) extending along the second direction, the third digital display three-point contact measuring device (901) is mounted on the second X-axis moving mechanism, and the second X-axis moving mechanism is used to drive the third digital display three-point contact measuring device (901) to move along the second direction so as to approach or move away from the side surface of the slider (14).

8. The linear guideway pair precision automatic detection system according to claim 2, characterized in that: The linear drive mechanism comprises a first motor (7), a screw rod (6) and two air-floating guide rails (10); the air-floating guide rails (10) are mounted on the detection table so as to extend along a first direction; the sliding saddle (5) is fixed on an air-floating sliding block (501) of the air-floating guide rails (10); Two bearing seats are arranged along a first direction on the detection table, the screw rod (6) is rotatably mounted between the two bearing seats, the saddle seat (5) is threadedly connected to the screw rod (6), and the first motor (7) is mounted on the detection table, and its output end is connected to one end of the screw rod (6).

9. A linear guide rail pair accuracy detection method, characterized in that: The steps include: S1; placing the linear guide pair to be inspected on the installation station of the automatic inspection platform (4) so ​​that the side of the linear rail (13) is in contact with the lateral installation surface (403) of the installation station, and then using the lower cylinder (151) and the locking screw (153) in the hydraulic fastener (15) to assemble the linear guide pair to be inspected on the installation station, wherein the shortened length of each lower cylinder (151) is the same; S2: controlling the linear drive mechanism to drive the linear rail flatness measuring mechanism (8) to move to the first end of the linear rail (13), controlling the linear module mechanism (11) to drive the slider (14) to move to the second end of the linear rail (13), and controlling the linear drive mechanism to drive the linear rail flatness measuring mechanism (8) to move slowly toward the second end of the linear rail (13) at a set speed; When the reading of the second digital display three-point contact measuring device (810) exceeds the set deviation range, the coordinate at that location is marked, and the operating table (1) controls the lower oil cylinder (151) at that location to increase or decrease the downward pulling force on the locking screw (153) accordingly, and then continues to measure the displacement at that location. If it still exceeds the set deviation range, continues to increase or decrease the downward pulling force on the locking screw (153) until the displacement at that location meets the set deviation range; When the second digital display three-point contact measuring device (810) moves to the second end of the linear rail (13), the pulling force values ​​applied by all the lower oil cylinders (151) to the locking screws (153) are recorded, and then the linear drive mechanism is controlled to drive the sliding saddle (5) back to the first end of the linear rail (13); S3: starting the first precision test, controlling the linear drive mechanism to drive the linear rail flatness measuring mechanism (8) and the slider flatness measuring mechanism (9) to move toward the position of the slider (14), using the linear rail flatness measuring mechanism (8) and the slider flatness measuring mechanism (9) to respectively measure the parallelism deviation data of the top surface of the linear rail (13) relative to the top surface of the slider (14) and the parallelism deviation data of the side surface of the linear rail (13) relative to the side surface of the slider (14), aligning with the deviation allowed in the national standard, and evaluating the precision grade of the linear guide pair; S4: Control the linear drive mechanism to drive the sliding saddle (5) to return to the first end of the linear rail (13) again, and the operating table (1) controls all the lower oil cylinders (151) to extend to a set length M1 to facilitate lateral adjustment of the linear rail (13); Controlling all the side oil cylinders (121) to extend to a set length so that the linear rail (13) is pressed tightly against the lateral mounting surface (403) of the mounting station; Controlling the linear drive mechanism to drive the linear rail flatness measuring mechanism (8) to slowly move toward the second end of the linear rail (13) at a set speed; when the reading of the first digital display three-point contact measuring device (805) exceeds the set deviation range, marking the coordinate at that location, and the operating table (1) controls the side oil cylinder (121) at that coordinate to increase or decrease the pressing force on the side of the linear rail (13), and then continuing to measure the displacement at that coordinate; if it still exceeds the set deviation range, continuing to increase or decrease the pressing force on the side of the linear rail (13) until the displacement at that coordinate meets the set deviation range; When the first digital display three-point contact measuring device (805) moves to the second end of the linear rail (13), the pressure values ​​applied to the linear rail (13) by all the side oil cylinders (121) are recorded, and then the linear drive mechanism is controlled to drive the sliding saddle (5) back to the first end of the linear rail (13); S5: the operating table (1) controls all the lower cylinders (151) to shorten the set length M1; S6: Start the second precision test: measure the parallelism deviation data of the top surface of the linear rail (13) relative to the top surface of the slider (14) and the parallelism deviation data of the side surface of the linear rail (13) relative to the side surface of the slider (14) according to the method recorded in S3, align with the deviation allowed in the national standard, and evaluate the precision level of the linear guide pair in the actual installation state; finally, record the tension values ​​applied by all the lower cylinders (151) to the linear rail (13) and the pressure values ​​applied by all the side cylinders (121) to the linear rail (13) again, and record the tension values ​​applied by all the lower cylinders (151) to the linear rail (13) and the pressure values ​​applied by all the side cylinders (121) to the linear rail (13) in the product manual so as to serve as a reference for subsequent actual installation.

Images