A linear guide 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 in particular to an automatic detection system and method for the accuracy of a linear guide rail pair. Background Art

[0002] Linear guide pair is a high-precision, high-efficiency and long-life linear drive unit. It is widely used in machine tools, automobiles, aerospace and other fields. Its travel accuracy has a great influence on the performance. In order to improve the product performance of domestic rolling linear guide pairs, it is necessary to detect the travel accuracy of linear guide pairs. There are two main methods for measuring the travel accuracy of linear guide pairs: manual measurement and automated measurement. The manual measurement method has high requirements on the accuracy and roughness of the detection platform, high requirements on the operation of the tester, low detection efficiency and poor repeatability. The automated measurement method is divided into contact and non-contact types: the non-contact measurement method is high in cost, greatly affected by environmental factors, and the measured result has large errors; the contact measurement method requires the sensor contact to be placed on the slider, which is more convenient and has small errors.

[0003] At present, whether manual measurement method or automatic measurement method is used, the following work needs to be done: 1. Preparation before installation: Clean the installation surface: Before installing the linear guide rail, the burrs, dirt and surface scratches on the bed installation surface must be removed to ensure that the bed installation surface is flat and clean.

[0004] 2. Check the guide rails and sliders: Check the appearance of the linear guide rails and sliders to ensure that there are no deformation, damage or rust.

[0005] 3. Place the guide rail flat on the bed mounting surface so that the side of the guide rail is against the lateral mounting surface of the bed, and then use the assembly screws to fix the bottom reference surface of the guide rail to the bed mounting surface, but do not completely lock it.

[0006] 4. Tighten the guide rail positioning bolts in sequence to make the guide rail fit tightly against the lateral mounting surface of the bed and determine the position of the slide rail.

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

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

[0009] 7. Install the remaining paired guide rails according to steps 1 to 6.

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

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

[0012] Technical Solution A linear guide pair precision automatic detection system, the linear guide pair comprises a linear rail and a slider, the detection system comprises an operating table, an automatic detection platform and a precision measurement component for measuring the precision of the linear guide pair; The detection table of the automatic detection platform is provided with an installation station extending along the first direction, and the installation station is provided with a plurality of through holes arranged along the first direction; the automatic detection platform is provided with a plurality of installation grooves corresponding to the through holes one by one, the installation grooves extend along the second direction, and the through holes are connected to the corresponding installation grooves; A hydraulic fastener is installed in each of the installation grooves, and 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 countersunk hole of the linear rail according to the instruction of the operating table to adjust the flatness of the top surface of the linear rail; A plurality of hydraulic telescopic parts arranged along a first direction are provided on one side of the installation station, and the hydraulic telescopic parts are used to apply pressure to the side of the linear rail according to the instructions of the operating table to adjust the flatness of the side of the linear rail; the first direction and the second direction are perpendicular.

[0013] According to one embodiment of the present invention, the precision measurement assembly includes a sliding saddle, a linear drive mechanism, at least one linear rail flatness measurement mechanism, and at least one slider flatness measurement mechanism; The sliding saddle is slidably installed on the detection table of the automatic detection platform, the linear rail flatness measuring mechanism and the slider flatness measuring mechanism are installed on the same side of the sliding saddle, the linear drive mechanism is used to drive the sliding saddle to move along the first direction according to the instructions of the operating table, the linear rail flatness measuring mechanism is used to measure the flatness of the top and side surfaces of the linear rail, and the slider flatness measuring mechanism is used to measure the flatness of the top and side surfaces of the slider.

[0014] According to one embodiment of the present invention, a pull rod is connected to the cylinder end of the lower oil cylinder, a block structure is provided at the bottom end of the locking screw, and a slot structure used in conjunction with the block structure is provided at one end of the pull rod away from the lower oil cylinder; When the locking screw is rotated to a first state, the block structure and the slot structure are engaged with each other; when the locking screw is rotated to a second state, the block structure and the slot structure are separated from each other.

[0015] According to one embodiment of the present invention, the block structure comprises a fixing column disposed at the bottom end of the locking screw and a plurality of locking blocks, wherein the plurality of locking blocks are evenly arranged around the axis of the fixing column; The slot structure comprises a circular slot opened at the top end of the pull rod, a plurality of staggered holes are opened on the side wall of the pull rod around its axis, the staggered holes correspond to the locking blocks one by one and are connected to the circular slot, the depth direction of the staggered holes is the same as the radial direction of the pull rod, the inner wall of the staggered holes is connected to the top surface of the pull rod, and a plurality of arc blocks corresponding to the locking blocks one by one are arranged on the inner wall of the circular slot near the top thereof, and the arc block is located between two adjacent staggered holes; When the locking screw is rotated to a first state, the locking block is located directly below the corresponding arc block; when the locking screw is rotated to a second state, the locking block and the corresponding arc block are staggered in the horizontal direction.

[0016] According to one embodiment of the present invention, the hydraulic telescopic part includes a side cylinder and a ram, and a side plate extending along a first direction is provided on the detection table of the automatic detection platform, and the side plate is located on the outside of the installation station. The side cylinder is fixedly installed on the side plate, and the ram is installed at the cylinder end of the side cylinder and points to the side of the linear rail.

[0017] According to one embodiment of the present invention, it comprises at least one linear module mechanism and at least one hydraulic slide block clamp, wherein the linear module mechanism is mounted on the detection table along a first direction, and the hydraulic slide block clamp is mounted on a moving block of the linear module mechanism; The hydraulic slider clamp includes a slider locking cylinder, a fixed plate and two limit plates, the slider locking cylinder extends along the second direction, the fixed plate is installed on the cylinder end of the slider locking cylinder, the two limit plates are arranged along the first direction and installed on a surface of the fixed 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 limit plates is not less than the distance between the first end face and the second end face.

[0018] According to one embodiment of the present invention, the linear rail 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 arranged on the sliding saddle, 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 rise and fall to approach or move away from the top surface of the linear rail, the first X-axis moving mechanism is installed on the sliding saddle extending along the second direction, the first digital display three-point contact measuring device 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 to move along the second direction to approach or move away from the side of the linear rail.

[0019] According to one 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 arranged on the sliding saddle, 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 rise and fall to approach or move away from the top surface of the slider, the second X-axis moving mechanism is installed on the sliding saddle extending along the second direction, the third digital display three-point contact measuring device is installed 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 to move along the second direction to approach or move away from the side of the slider.

[0020] According to an embodiment of the present invention, the linear drive mechanism comprises a first motor, a lead screw and two air-floating guide rails, the air-floating guide rails are mounted on the detection table extending along a first direction, and the sliding saddle is fixed on the air-floating sliding block of the air-floating guide rails; Two bearing seats are arranged along a first direction on the detection table, the screw rod is rotatably installed between the two bearing seats, the saddle seat is threadedly connected to the screw rod, the first motor is installed on the detection table, and its output end is connected to one end of the screw rod.

[0021] A linear guide pair accuracy detection method comprises the following steps: S1; placing the linear guide pair to be tested on the installation station of the automatic testing platform so that the side of the linear guide is against the lateral installation surface of the installation station, and then using the lower cylinder and locking screw in the hydraulic fastener to assemble the linear guide pair to be tested on the installation station, wherein the shortening length of each lower cylinder is the same; S2: Control the linear drive mechanism to drive the linear rail flatness measuring mechanism to move to the first end of the linear rail, control the linear module mechanism to drive the slider to move to the second end of the linear rail, and control the linear drive mechanism to drive the linear rail flatness measuring mechanism to move slowly toward the second end of the linear rail at a set speed; When the reading of the second digital display three-point contact measuring device exceeds the set deviation range, the coordinate at that location is marked, and the operating table controls the lower oil cylinder at that location to increase or decrease the downward force on the locking screw accordingly, and then continues to measure the displacement at that location. If it still exceeds the set deviation range, the downward force on the locking screw is continued to be increased or decreased until the displacement at that location meets the set deviation range; When the second digital display three-point contact measuring device moves to the second end of the linear rail, the pulling force values ​​applied by all the lower oil cylinders to the locking screws are recorded, and then the linear drive mechanism is controlled to drive the sliding saddle back to the first end of the linear rail; S3: Start the first accuracy test, control the linear drive mechanism to drive the linear rail flatness measuring mechanism and the slider flatness measuring mechanism to move toward the position of the slider, use the linear rail flatness measuring mechanism and the slider flatness measuring mechanism to respectively measure the parallelism deviation data of the top surface of the linear rail relative to the top surface of the slider and the parallelism deviation data of the side surface of the linear rail relative to the side surface of the slider, align with the deviation allowed in the national standard, and evaluate the accuracy level of the linear guide pair; S4: Control the linear drive mechanism to drive the sliding saddle to return to the first end of the linear rail again, and the operating table controls all the lower cylinders to extend to a set length M1 to facilitate lateral adjustment of the linear rail; Control all side oil cylinders to extend to a set length so that the linear rail is pressed tightly against the lateral mounting surface of the installation station; The linear drive mechanism is controlled to drive the linear rail flatness measuring mechanism to move slowly toward the second end of the linear rail at a set speed; when the reading of the first digital display three-point contact measuring device exceeds the set deviation range, the coordinate at that location is marked, and the operating table controls the side oil cylinder at that coordinate to increase or decrease the tightening force on the side of the linear rail, and then continues to measure the displacement at that coordinate. If it still exceeds the set deviation range, the tightening force on the side of the linear rail is continued to be increased or decreased until the displacement at that coordinate meets the set deviation range; When the first digital display three-point contact measuring device moves to the second end of the linear rail, the pressure values ​​applied by all side oil cylinders to the linear rail are recorded, and then the linear drive mechanism is controlled to drive the sliding saddle back to the first end of the linear rail; S5: The operating table controls all lower cylinders 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 relative to the top surface of the slider and the parallelism deviation data of the side surface of the linear rail relative to the side surface of the slider according to the method recorded in S, 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 again the pulling force values ​​applied by all lower cylinders on the linear rail and the pressure values ​​applied by all side cylinders on the linear rail, and record the pulling force values ​​applied by all lower cylinders on the linear rail and the pressure values ​​applied by all side cylinders on the linear rail in the product manual for reference in the subsequent actual installation.

[0022] Beneficial effects of the present invention: Compared with the previous measurement methods, this linear guide pair precision automatic detection system has the following advantages: First, there is no need to manually tighten or loosen the locking screws during the entire test, and a measuring cylinder is used to replace the previous guide positioning bolts. Therefore, the installation of the linear guide pair is simpler and more convenient, and the alignment efficiency is improved.

[0023] Second, the flatness of the top surface of the linear rail is adjusted by the operation table, hydraulic fasteners and precision measuring components, and the flatness of the side surface of the linear rail is adjusted by the operation table, hydraulic telescopic parts and precision measuring components. The whole alignment process is simpler and more efficient, which greatly improves the alignment efficiency.

[0024] Third, after the levelness of the top surface of the linear rail is adjusted, the tension applied by all the lower cylinders to the locking screws is recorded. After the levelness of the side of the linear rail is adjusted, the pressure values ​​of all the hydraulic telescopic parts on the side of the linear rail are recorded. Then the tension values ​​applied by each lower cylinder to the locking screw and the pressure values ​​of each hydraulic telescopic part on the side of the linear rail are recorded in the product installation manual. In this way, when the linear guide pair is actually installed in the subsequent product, the installer can use the torque wrench to install the corresponding assembly screws to quickly calibrate the top surface flatness of the linear rail according to the data recorded in the manual, and use the torque wrench to accurately install the guide rail positioning bolts to quickly calibrate the top surface flatness of the linear rail. It can be installed successfully in one go, saving the time for linear rail installation and alignment, improving installation efficiency, and no longer need to be used with a spirit level or micrometer. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram provided for an embodiment of the present invention; Figure 2 A three-dimensional diagram of an automatic detection platform provided by an embodiment of the present invention; Figure 3 A front view of an automatic detection platform provided by an embodiment of the present invention; Figure 4 The embodiment of the present invention provides Figure 3 Sectional view of AA in the middle; Figure 5 The embodiment of the present invention provides Figure 4 A magnified view of part D in the middle; Figure 6 A structural diagram of a lower oil cylinder, a pull rod and a locking screw provided in an embodiment of the present invention; Figure 7 A structural diagram of a linear module mechanism, a hydraulic slider clamp and a linear guide pair provided in an embodiment of the present invention; Figure 8 The embodiment of the present invention provides Figure 7 Enlarged view of part E in the middle; Fig. 9 The embodiment of the present invention provides Figure 3 Cross-sectional view of the middle BB; Fig.10 The embodiment of the present invention provides Fig. 9 Enlarged view of part F; Fig.11 The embodiment of the present invention provides Figure 3 Sectional view of CC Fig.12 The embodiment of the present invention provides Fig.11 Enlarged view of section G.

[0027] Icons: 1. Operation table; 2. Printer; 3. Hydraulic station; 4. Automatic detection platform; 401. Mounting slot; 402. Side plate; 403. Lateral mounting surface; 5. Sliding saddle; 501. Air floating sliding block; 6. Screw rod; 7. First motor; 8. Linear rail flatness measuring mechanism; 801. Second motor; 802. First threaded rod; 803. Moving seat; 804. Hanger; 805. First digital display three-point contact measuring device; 806. Third motor; 807. Second threaded rod; 808. Lifting seat; 809. Connecting frame; 810. Second digital display three-point contact measuring device; 9. Slider plane Degree measuring mechanism; 901, third digital display three-point contact measuring device; 902, fourth digital display three-point contact measuring device; 10, air floating guide rail; 11, linear module mechanism; 111, moving block; 12, hydraulic telescopic part; 121, side cylinder; 122, top head; 13, linear rail; 14, slider; 15, hydraulic fastener; 151, lower cylinder; 152, pull rod; 153, locking screw; 154, fixing column; 155, locking block; 156, staggered hole; 16, hydraulic slider clamp; 161, mounting seat; 162, slider locking cylinder; 163, fixing plate; 164, limit plate. DETAILED DESCRIPTION

[0028] The technical solution 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 the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Embodiment 1: like Figure 1-Figure 12 As shown, the first embodiment of the present invention provides a linear guide pair precision automatic detection system, the linear guide pair includes a linear rail 13 and a slider 14, the detection system includes an operating table 1, an automatic detection platform 4 and a precision measurement component for measuring the precision of the linear guide pair; An installation station extending along the first direction is provided on the detection table of the automatic detection platform 4, 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 are provided on the automatic detection platform 4, and the installation grooves 401 extend along the second direction, and the through holes are connected to the corresponding installation grooves 401; 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 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. One side of the installation station is provided with a plurality of hydraulic telescopic members 12 arranged along a first direction, and the hydraulic telescopic members 12 are used to apply pressure to the side of the linear rail 13 according to the instructions 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.

[0030] It should be noted that when actually installing the linear guide pair, adjusting the horizontality of the top and side surfaces of the guide rail by adjusting the assembly screws and guide rail positioning bolts is a key step to ensure the accuracy of the guide rail. The following are the specific adjustment methods: Adjust the levelness of the top surface of the guide rail: Preliminary fixing of the guide rail: First use the assembly screws to roughly fix the bottom reference surface of the guide rail to the bottom assembly surface of the bed. Be careful not to tighten the screws completely to facilitate subsequent adjustments.

[0031] Measure the levelness: Place a level on the top surface of the guide rail, measure in the middle and at both ends of the guide rail, record the reading of the level, or use a dial indicator or micrometer to move along the length of the guide rail to measure the levelness of the top surface of the guide rail.

[0032] Adjust the assembly screws: According to the reading of the level, adjust the levelness of the top surface of the guide rail by adjusting the assembly screws. If the reading of a certain part of the guide rail is too high or too low, tighten or loosen the corresponding assembly screws appropriately to make the top surface of the guide rail reach a horizontal state.

[0033] Tighten the screws gradually: During the adjustment process, tighten the assembly screws gradually to ensure that the rail remains stable during the adjustment process. It is usually recommended to tighten the screws gradually from the middle of the rail to the ends to avoid deformation of the rail.

[0034] Recheck the levelness: After the adjustment is completed, use the level to measure the top surface of the guide rail again to ensure that its levelness meets the requirements. If necessary, repeat the above adjustment steps until a satisfactory level is achieved.

[0035] Adjust the levelness of the rail sides: Fix with a vise or clamp: After initially fixing the bottom of the guide rail, use a vise or special clamp to gently press the side reference surface of the guide rail against the side assembly surface of the bed to determine the side position of the guide rail.

[0036] Measure the side levelness: Place the level or micrometer on the reference plane on the side of the guide rail, move the level or micrometer along the length of the guide rail, and measure the levelness of the side of the guide rail.

[0037] Adjust the positioning bolts: According to the measurement results, adjust the horizontality of the side of the guide rail by adjusting the positioning bolts of the guide rail. If the reading of a certain part of the side of the guide rail is too high or too low, tighten or loosen the corresponding positioning bolts appropriately to make the side of the guide rail reach a horizontal state.

[0038] Tighten the bolts gradually: During the adjustment process, tighten the positioning bolts gradually to ensure that the side of the rail fits tightly against the side assembly surface of the bed. It is usually recommended to tighten the bolts gradually from one end of the rail to the other end to ensure the flatness of the side of the rail.

[0039] Recheck the side levelness: After the adjustment is completed, use the level or dial gauge to measure the side of the guide rail again to ensure that its levelness meets the requirements. If necessary, repeat the above adjustment steps until a satisfactory level is achieved.

[0040] 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 meter and tighten the guide rail positioning bolts according to the measurement results of the level meter or the micrometer. The whole alignment process is relatively cumbersome and inefficient.

[0041] Different from this, when using the linear guideway pair precision automatic detection system to find the accuracy, the following steps are included: First, place the linear guide pair on the installation station of the automatic inspection platform 4 so that the side of the linear rail 13 is against the lateral installation surface 403 of the installation station. Then, put the locking screws 153 into the installation countersunk holes of the linear rail 13 in turn, and connect the locking screws 153 to the lower oil cylinder 151. Then, the operating table 1 controls multiple lower oil cylinders 151 to synchronously shorten the set length m1, so as to pull down the locking screws 153 in the installation countersunk holes of the linear rail 13, and the top of the locking screws 153 is pressed into the installation countersunk holes of the linear rail 13. Multiple locking screws 153 act on the linear rail 13 with the same pressure to preliminarily install the linear rail 13 on the installation station. Note that the locking screws 153 are not completely locked in this process for subsequent adjustments.

[0042] Then use the precision measurement component to move along the length direction of the linear rail 13 to measure the flatness of the top surface of the linear rail 13. When the displacement at a certain position on the top surface of the linear rail 13 is greater than the set range, control the lower oil cylinder 151 at the position to continue to shorten the fixed length, increase the downward force on the locking screw 153, and then continue to measure the displacement at the coordinate. If it is still greater than the set range, continue to increase the downward force on the locking screw 153 until the displacement at the coordinate meets the set range. If the displacement at a certain position on the top surface of the linear rail 13 is less than the set range, control the lower oil cylinder 151 at the position to extend the fixed length, reduce the downward force on the locking screw 153, and then continue to measure the displacement at the coordinate. If it is still less than the set range, continue to reduce the downward force on the locking screw 153 until the displacement at the coordinate meets the set range. Adjust the horizontality of the top surface of the linear rail 13 in this way.

[0043] After the horizontality of the top surface of the linear rail 13 is adjusted, the pulling force applied by all the lower oil cylinders 151 to the locking screws 153 is recorded.

[0044] Next, the operating table 1 controls all the lower cylinders 151 to extend to a set length m2 to appropriately loosen the locking screws 153 to facilitate lateral adjustment of the linear rail 13; then controls all the hydraulic telescopic parts 12 to extend to a set length m3 so that the linear rail 13 is pressed onto the lateral mounting surface 403 of the installation station.

[0045] Then use the precision measurement assembly to move along the length direction of the linear rail 13 to measure the flatness of the side of the linear rail 13; when the displacement at a certain position on the side of the linear rail 13 is greater than the set range, control the hydraulic telescopic part 12 at the position to continue to extend the fixed length, increase the pressure on the side of the linear rail 13, and then continue to measure the displacement at the position. If it is still greater than the set range, continue to increase the pressure on the side of the linear rail 13 until the displacement at the position meets the set range. If the displacement at a certain position on the side of the linear rail 13 is less than the set range, control the hydraulic telescopic part 12 at the position to shorten the fixed length, reduce the pressure on the side of the linear rail 13, and then continue to measure the displacement at the position. If it is still less than the set range, continue to reduce the pressure on the side of the linear rail 13 until the displacement at the position meets the set range. Adjust the horizontality of the side of the linear rail 13 in this way. Then record the pressure values ​​of all hydraulic telescopic parts 12 exerting pressure on the side of the linear rail 13.

[0046] Finally, the operating platform 1 controls all the lower oil cylinders 151 to shorten the set length m2 to return to the state where the horizontal adjustment of the top surface of the linear rail 13 is completed.

[0047] It can be seen that the use of the present linear guide pair precision automatic detection system has the following advantages compared with the previous measurement methods: First, there is no need to manually tighten or loosen the locking screw 153 during the entire test, and the side cylinder 121 is used to replace the previous guide positioning bolt. Therefore, the installation of the linear guide pair is simpler and more convenient, and the alignment efficiency is improved.

[0048] Second, by relying on the operation table 1, hydraulic fasteners 15 and precision measuring components to adjust the flatness of the top surface of the linear rail 13, and relying on the operation table 1, hydraulic telescopic parts 12 and precision measuring components to adjust the flatness of the side of the linear rail, the entire alignment process is simpler and more efficient, which greatly improves the alignment efficiency.

[0049] Third, after the levelness of the top surface of the linear rail 13 is adjusted, the tension applied by all the lower oil cylinders 151 to the locking screws 153 is recorded. After the levelness of the side of the linear rail 13 is adjusted, the pressure values ​​of all the hydraulic telescopic parts 12 on the side of the linear rail 13 are recorded. Then the tension values ​​applied by each lower oil cylinder 151 to the locking screw 153 and the pressure values ​​of each hydraulic telescopic part 12 on the side of the linear rail 13 are recorded in the product installation manual. In this way, when the linear guide pair is actually installed in the subsequent product, the installer can use the torque wrench to install the corresponding assembly screws to quickly calibrate the top surface flatness of the linear rail 13 according to the data recorded in the manual, and use the torque wrench to accurately install the guide rail positioning bolts to quickly calibrate the top surface flatness of the linear rail 13. It can be installed successfully at one time, saving the installation and alignment time of the linear rail 13, improving the installation efficiency, and no longer need to be used with a level or micrometer.

[0050] In this embodiment, the 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 .

[0051] In this embodiment, if Figure 1 as well as Figure 5 As shown, the installation station is located on one side of the top surface of the automatic detection platform 4, and 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 the linear guide pair is installed on the detection platform, the bottom surface of the linear rail 13 is placed on the installation bottom surface, and the side surface of the linear rail 13 is in contact with the lateral installation surface 403.

[0052] The above-mentioned through holes are arranged on the installation bottom surface, and multiple through holes are evenly arranged along the length direction of the installation bottom surface. The installation groove 401 is located on the side of the automatic detection platform 4, and multiple installation grooves 401 are evenly arranged 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 groove 401, the through hole on the installation bottom surface, and the installation countersunk hole on the linear rail 13 are one-to-one corresponding, and the installation groove 401 and the corresponding through hole are connected.

[0053] As a preferred embodiment, a hydraulic fastener 15 is installed in each installation groove 401, and the hydraulic fastener 15 includes a lower oil cylinder 151, a tie rod 152 and a locking screw 153, wherein the lower oil cylinder 151 is fixedly installed on the inner top wall of the installation groove 401, the tie rod 152 is a cylinder, and the tie rod 152 is connected to the cylinder end of the lower oil cylinder 151, and the tie 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 arranged at the bottom end of the locking screw 153, and the slot structure is arranged at the top end of the tie rod 152.

[0054] More specifically, Figure 6 As shown, the block structure includes a fixing column 154 and a plurality of locking blocks 155 disposed at the bottom end of a locking screw 153. The fixing column 154 and the locking screw 153 are coaxially disposed, and the diameter of the fixing column 154 is smaller than the diameter of the locking screw 153. The locking blocks 155 are fixed to the side surface of the fixing column 154 close to the bottom surface thereof, and the plurality of locking blocks 155 are evenly disposed around the axis of the fixing column 154.

[0055] The slot structure includes a circular slot opened at the top of the pull rod 152, and the circular slot is coaxially arranged with the pull rod 152. A plurality of staggered holes 156 are provided on the side wall of the pull rod 152 around its axis. The length direction of the staggered holes 156 is the same as the axis direction of the pull rod 152, and the depth direction of the staggered holes 156 is the same as the radial direction of the pull rod 152. The staggered holes 156 correspond to the locking blocks 155 one by one and are connected to the circular groove. The two opposite side walls of the staggered holes 156 are connected to the top surface of the pull rod 152. That is, the plurality of staggered holes 156 divide the top of the pull rod 152 into a plurality of ring blocks. Furthermore, an arc block is provided on the inner wall of each ring block, the arc block is close to the top of the ring block, the arc block corresponds to the locking block 155 one by one, and the arc block is located between two adjacent staggered holes 156.

[0056] It should be noted that the locking block 155 is generally in the shape of a linear triangle, with a flat top surface and another right-angled surface welded to the side of the fixing column 154. The difference between the radius of the fixing column 154 and the radius of the circular groove is greater than the length of the top surface of the locking block 155.

[0057] In this way, when connecting the tie rod 152 and the locking screw 153, first rotate the locking screw 153 to a certain angle so that the locking block 155 is located directly above the misaligned hole 156, and then extend the lower cylinder 151 to a certain length so that the locking block 155 on the tie rod 152 enters the misaligned hole 156 at the top of the tie rod 152, and the locking block 155 is lower than the arc block. Then turn the locking screw 153 to rotate it, 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 block. Then control the lower cylinder 151 to shorten to drive the tie rod 152 to move downward. Since the locking block 155 is blocked by the arc block, the top surface of the locking block 155 will eventually fit the lower surface of the arc block. In this way, the locking state is achieved.

[0058] When the locking state between the lower oil cylinder 151 and the locking screw 153 needs to be released, the lower oil cylinder 151 is first controlled to extend a certain length so that the top surface of the locking block 155 is no longer in close contact with the lower surface of the arc block, and then the locking screw 153 is turned to make it rotate, so that the locking block 155 moves away from the bottom of the arc block and aligns with the misaligned hole 156, and finally the lower oil cylinder 151 is controlled to shorten a certain length to drive the pull rod 152 to move downward, so that the pull rod 152 and the locking block 155 are separated in the vertical direction. In this way, the unlocking state can be achieved.

[0059] 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, the cooperation between the lower oil cylinder 151 and the locking screw 153 can achieve simple and quick installation of the linear rail 13, without manually screwing the locking screw 153.

[0060] It should be clear that the inner wall of the installation countersunk hole of the linear rail 13 is not provided with internal threads, that is, the locking screw 153 is not connected to the installation countersunk hole of the linear rail 13 by threads. In this way, there is no need to manually tighten or loosen the locking screw 153, but the lower oil cylinder 151 drives the locking screw 153 to press down the linear rail 13 to fix the linear rail 13 to the installation station, which is more convenient to use.

[0061] It should be explained that the automatic detection system also includes a hydraulic station 3 located on one side of the automatic detection platform 4, and 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 transmits 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.

[0062] It should be noted that the pulling force applied by the lower cylinder 151 to the locking screw 153 can be determined according to F=PA, where P is the pressure value of the hydraulic oil in the lower cylinder 151 and A is the effective area of ​​the lower cylinder 151. The pressure value P of the hydraulic oil in the lower cylinder 151 is usually provided by the hydraulic station 3 in Pascal (Pa) or Megapascal (MPa). This pressure value can be directly read by the pressure gauge of the hydraulic station 3.

[0063] The effective area A of the piston is a function of the cylinder inner diameter and the piston rod diameter. The specific formula for A is as follows: Wherein, D is the inner diameter of the lower cylinder 151, and d is the diameter of the cylinder piston rod.

[0064] According to the formula F=P×A, the theoretical pulling force applied by the lower cylinder 151 to the locking screw 153 can be calculated.

[0065] It should be noted that when using a torque wrench, first set the required torque value on the wrench, lock the wrench and start tightening the bolt. When the bolt reaches the set torque value, the torque release joint will disengage and make a "click" sound, indicating that the preset torque has been reached.

[0066] In the present application, the horizontality of the top surface of the linear rail 13 is adjusted by using the lower oil cylinder 151 and the locking screw 153, and the tension value applied by each lower oil cylinder 151 to the locking screw 153 can be obtained according to the calculation formula F=PA, and then the tension value of each lower oil cylinder 151 is recorded in the product installation manual. In this way, in the subsequent actual installation process of the linear rail 13, the worker uses the recorded tension value of each lower oil cylinder 151 as a reference standard, and then uses a torque wrench to set the torque value according to the pressure value of each lower oil cylinder 151 recorded above, so as to tighten multiple assembly screws, thereby quickly completing the adjustment of the horizontality of the top surface of the linear rail 13, greatly improving the alignment efficiency.

[0067] In this embodiment, if Figure 5 As shown, a side plate 402 is installed on the outside of each installation station, that is, on the side away from the middle position of the automatic detection platform 4, and a plurality of circular holes are evenly opened along the length direction of the side plate 402. The circular holes correspond to the hydraulic telescopic parts 12 one by one, and the hydraulic telescopic parts 12 are installed on the corresponding circular holes.

[0068] Specifically, the hydraulic telescopic member 12 includes a side oil cylinder 121 and a head 122. The side oil cylinder 121 is fixedly mounted on the outer surface of the side plate 402, and the cylinder end of the side oil cylinder 121 passes through the circular hole on the side plate 402. The head 122 is mounted on the cylinder end of the side oil cylinder 121. The hydraulic station 3 is connected to the side oil cylinder 121 through a pipeline. It should be clear that the projection of the head 122 in the direction toward the linear rail 13 falls completely or partially on the side of the linear rail 13, so that when the side oil cylinder 121 is extended to drive the head 122 to move toward the linear rail 13, the end surface of the head 122 will act completely or partially on the side of the linear rail 13.

[0069] It should be understood that both the lower cylinder 151 and the side cylinder 121 are in communication connection with the control system of the operating platform 1 , and the control system controls the actions of the lower cylinder 151 and the side cylinder 121 .

[0070] In this embodiment, after the horizontality of the side of the linear rail 13 is adjusted, the pressure value applied by the side cylinder 121 to the side of the linear rail 13 can be calculated according to the above formula F=PA, so that the pressure values ​​applied by all the side cylinders 121 to the side of the linear rail 13 can be recorded and recorded in the product installation manual. Later, when the linear guide pair is actually installed, the worker can use the recorded pressure values ​​applied by each side cylinder 121 to the side of the linear rail 13 as a reference standard, and then use a torque wrench to set the torque value according to the recorded pressure values ​​applied by each lower cylinder 151 to the side of the linear rail 13, so as to tighten the multiple guide rail positioning bolts, so as to quickly complete the adjustment of the horizontality of the top surface of the linear rail 13, greatly improving the alignment efficiency.

[0071] In this embodiment, if Figure 2 As shown, the precision measurement assembly includes 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 linear drive mechanism includes a first motor 7, a screw rod 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 thereof, and the two air-floating guide rails 10 are arranged along the width direction of the automatic detection platform 4. The sliding saddle 5 is fixed on the air-floating sliding blocks 501 of the two air-floating guide rails 10.

[0072] A bearing seat is fixedly installed in the front and rear directions of the top surface of the automatic detection platform 4, and the screw rod 6 is rotatably installed between the two bearing seats, and the screw rod 6 is located between the two air-floating guide rails 10. A rectangular block is fixedly installed on the bottom surface of the sliding saddle 5, and the rectangular block is threadedly connected to the screw rod 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 screw rod 6. The first motor 7 is connected to the control system signal of the operating table 1.

[0073] In this embodiment, the linear rail flatness measuring mechanism 8 and the slider flatness measuring mechanism 9 are installed on the same side of the slide saddle 5, and the linear drive mechanism is used to drive the slide saddle 5 to move along the length direction of the automatic detection platform 4 according to the instruction of the operating table 1 to drive the linear rail flatness measuring mechanism 8 and the slider flatness measuring mechanism 9 to move simultaneously. 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.

[0074] In this way, the operating platform 1 sends instructions to the first motor 7 to control the first motor 7 to drive the screw rod 6 to rotate around its own axis. The screw rod 6 rotates to drive the sliding saddle 5 to move along the length direction of the screw rod 6, thereby driving the linear rail flatness measuring mechanism 8 and the slider flatness measuring mechanism 9 to move along the length direction of the automatic detection platform 4.

[0075] It should be noted that the number of rotations of the first motor 7 can be directly read by the encoder, and when the first motor 7 rotates a fixed number of times, the corresponding moving distance of the sliding saddle 5 can be calculated by the operating table 1. The position information of all lower cylinders 151 and side cylinders 121 on the automatic detection platform 4 is entered into the calculation module in the operating table 1. The positions of the linear rail flatness measuring mechanism 8 and the slider flatness measuring mechanism 9 on the sliding saddle 5 are fixed.

[0076] When adjusting the horizontality of the top surface of the linear rail 13, the sliding saddle 5 needs to be moved to the initial end of the linear rail 13. At this time, the linear rail flatness measuring mechanism 8 is located at the initial end of the linear rail 13. When starting the measurement, the operating table 1 controls the first motor 7 to start, and the sliding saddle 5 drives the linear rail flatness measuring mechanism 8 to move toward the terminal direction of the linear rail 13.

[0077] When the linear rail flatness measuring mechanism 8 measures that the displacement at a certain position on the top surface of the linear rail 13 exceeds the set range, the operating table 1 first controls the first motor 7 to stop working, and obtains the number of revolutions of the current first motor 7, so as to obtain the position information of the current linear rail flatness measuring mechanism 8, that is, how much distance the current linear rail flatness measuring mechanism 8 has moved on the linear rail 13. Then the position information of the current linear rail flatness measuring mechanism 8 is compared with the position coordinates of each lower oil cylinder 151 entered in the system, and the lower oil cylinder 151 closest to the linear rail flatness measuring mechanism 8 is selected. Finally, the operating table 1 controls the lower oil cylinder 151 to shorten or extend the set length L to increase or reduce the downward pulling force on the locking screw 153, and then controls the linear rail flatness measuring mechanism 8 to measure the displacement at the position again. If the displacement measured this time meets the set range, the first motor 7 is controlled to continue working. If it still does not meet the set range, the lower oil cylinder 151 is controlled to continue shortening or extending the set length L1. Where L is greater than L1.

[0078] Similarly, when adjusting the horizontality of the side of the linear rail 13, the specific position information of the current linear rail flatness measuring mechanism 8 is obtained by calculating the number of rotations of the first motor 7, and then the specific position information of the current linear rail flatness measuring mechanism 8 is compared with the position coordinates of each side cylinder 121 entered into the system, and the side cylinder 121 closest to the linear rail flatness measuring mechanism 8 is selected, and finally the side cylinder 121 is controlled to extend or shorten to adjust the side of the linear rail 13.

[0079] In addition, a displacement sensor can also be installed on the automatic detection platform 4 to determine the specific position information of the linear rail 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 rail 13 respectively. Then the sliding brush of the self-resetting linear displacement sensor is connected to the linear rail flatness measuring mechanism 8 or the slider flatness measuring mechanism 9 through a pull rod. When the sliding saddle 5 moves, it will drive the sliding brush to slide on the resistance element of the self-resetting linear displacement sensor and change the resistance value, so that the distance moved by the current linear rail flatness measuring mechanism 8 or the slider flatness measuring mechanism 9 can be accurately obtained.

[0080] In addition, it should be noted that in the past, when using a micrometer to measure the horizontality of the top surface or the side surface of the linear rail 13, it is necessary to manually remove the slider 14 or move it to the end of the linear rail 13 to avoid the slider 14 obstructing the measurement.

[0081] In contrast, Figure 6 As shown, a slider moving component is arranged on the automatic detection platform 4 of this embodiment, such as Figure 7 As shown, the slider moving assembly includes a linear module mechanism 11 and a hydraulic slider clamp 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.

[0082] Furthermore, the hydraulic slider clamp 16 is installed on the moving block 111 of the linear module mechanism 11. Hydraulic slide clamp 16 as Figure 8As shown, it includes a mounting seat 161, a slider locking oil cylinder 162, a fixing plate 163 and two limiting plates 164. The mounting seat 161 is fixedly mounted on the moving block 111 by bolts or screws, and the slider locking oil cylinder 162 is fixedly mounted on the mounting seat 161, and the slider locking oil cylinder 162 is perpendicular to the installation station or perpendicular to the linear rail 13. That is, the extension 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 limiting plates 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.

[0083] It should be noted that the slider 14 in this application is as follows Figure 8 As shown, there is 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 limiting pieces 164 is not less than the distance between the front and rear end surfaces of the mounting metal plate. In addition, the mounting metal plate on some sliders 14 on the market does not protrude from the top surface of the slider body. In this case, the distance between the two limiting pieces 164 needs to be not less than the length of the slider 14. Of course, the distance between the two limiting pieces 164 in this embodiment can also be set to be not less than the length of the slider 14.

[0084] In this way, when the position of the slider 14 on the linear rail 13 needs to be changed, the moving block 111 on the linear module mechanism 11 is manually pushed to drive the hydraulic slider clamp 16 close to the slider 14, and the position of the moving block 111 is fine-tuned so that the hydraulic slider clamp 16 is facing the slider 14, and then the operating table 1 controls the slider locking cylinder 162 to extend a certain length until the front and rear end surfaces of the installation metal plate are located between the two limit plates 164. Then the operating table 1 controls the linear module mechanism 11, and the moving block 111 on the linear module mechanism 11 drives the hydraulic slider clamp 16 to move. Since the limit plate 164 blocks the slider 14, it will drive the slider 14 to move on the linear rail 13.

[0085] In this embodiment, it should be noted that the structures of the linear rail flatness measuring mechanism 8 and the slider flatness measuring mechanism 9 are substantially the same, and only the sizes of some structures are slightly different. In order to avoid redundancy, the linear rail flatness measuring mechanism 8 is first described in detail, and then the differences between the slider flatness measuring mechanism 9 and the linear rail flatness measuring mechanism 8 are described.

[0086] like Fig. 9 and Fig.10As shown, the linear rail 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 sliding 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 rise and fall to approach or move away from the top surface of the linear rail 13. The X-axis moving mechanism is installed on the sliding saddle 5 extending 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 of the linear rail 13.

[0087] Wherein, the X-axis moving mechanism includes a mounting base, a second motor 801, a first threaded rod 802, a moving seat 803 and a hanger 804. The mounting base is extended and mounted on the sliding saddle 5 along the length direction of the sliding saddle 5. The first threaded rod 802 is rotatably mounted on the mounting base. The moving seat 803 is slidably connected to the mounting base, and the moving seat 803 is threadedly connected to the first threaded rod 802. The top of the hanger 804 is fixedly connected to the moving seat 803, and the other end is located outside the installation station. The hanger 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 sliding 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.

[0088] 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 fixedly installed on the sliding saddle 5, the second threaded rod 807 is vertically 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, and the connecting frame 809 is fixedly connected to the lifting seat 808. The connecting frame 809 includes a plate body 1 and a plate body 2 which are perpendicular to each other, the plate body 1 is fixedly connected to the lifting seat 808, and the plate body 2 is parallel to the installation station. The above-mentioned second digital display three-point contact measuring device 810 is installed on the plate body 2 and is located directly above the installation station. The third motor 806 is installed at the top of the vertical frame, and the output end of the third motor 806 is connected to the second threaded rod 807.

[0089] In this way, when it is necessary to measure the horizontality of the top surface of the linear rail 13, the operating table 1 controls the third motor 806 to drive the second threaded rod 807 to rotate, 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 rail 13. When the three measuring heads on the second digital display three-point contact measuring device 810 contact the top surface of the linear rail 13, the third motor 806 stops working. Then the operating table 1 controls the first motor 7 to start, and the sliding saddle 5 drives the linear rail flatness measuring mechanism 8 to move along the length direction of the linear rail 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 rail 13 for measurement.

[0090] When it is necessary to measure the horizontality of the side of the linear rail 13, the operating table 1 controls the second motor 801 to drive the first threaded rod 802 to rotate, so as to drive the hanger 804 and the first digital three-point contact measuring device 805 to move horizontally toward the linear rail 13 until the three measuring heads of the first digital three-point contact measuring device 805 are attached to the side of the linear rail 13. Then the operating table 1 controls the first motor 7 to start, and the sliding saddle 5 drives the linear rail flatness measuring mechanism 8 to move along the length direction of the linear rail 13, so that the three measuring heads on the first digital three-point contact measuring device 805 move along the length direction of the linear rail 13 for measurement.

[0091] like Fig.11 and Fig.12 As 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 rail flatness measuring mechanism 8, and the only difference is that the size of the hanger 804 in the present X-axis moving mechanism is smaller than the size of the hanger 804 in the linear rail flatness measuring mechanism 8. Similarly, the present Z-axis moving mechanism has the same structure as the Z-axis moving mechanism in the linear rail flatness measuring mechanism 8, and the only difference is that the stroke of the present Z-axis moving mechanism is smaller than the stroke of the Z-axis moving mechanism in the above-mentioned linear rail 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 hanger 804 in the present X-axis moving mechanism. The present fourth digital display three-point contact measuring device 902 is installed on the connecting frame 809 in the Z-axis moving mechanism. In order to avoid redundancy, the slider flatness measuring mechanism 9 will not be described in detail.

[0092] For the convenience of distinction, the X-axis moving mechanism and the Z-axis moving mechanism in the linear rail flatness measuring mechanism 8 are named as the first X-axis moving mechanism and the first Z-axis moving mechanism, respectively. The X-axis moving mechanism and the Z-axis moving mechanism in the slider flatness measuring mechanism 9 are named as the second X-axis moving mechanism and the second Z-axis moving mechanism, respectively.

[0093] Optional, such as Figure 2 As shown, there are two installation stations in the present 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 set on one side of each installation station, and a set of linear rail flatness measuring mechanisms 8 and a slider flatness measuring mechanism 9 are respectively installed at both ends of the slide saddle 5. In this way, the precision of the two linear guide rail pairs can be measured synchronously.

[0094] In this embodiment, Figure 1 As shown, the automatic detection system further includes a printer 2 placed on top of the operating table 1. The operating table 1 receives data fed back by the lower cylinder 151, the side cylinder 121, the linear rail flatness measuring mechanism 8 and the slider flatness measuring mechanism 9, and prints them out through the printer 2.

[0095] It should be noted that in the past, when using a dial indicator or micrometer to measure the flatness of a guide rail, the value measured by the dial indicator or micrometer represents the relative displacement of the guide rail surface at the measuring point in the vertical direction relative to the reference surface. This displacement reflects the flatness of the guide rail surface, that is, the flatness error.

[0096] 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 the reading of the dial indicator varies between 0.00mm and 0.05mm during the measurement process, the maximum flatness error of the guide rail is 0.05mm. In addition, when the pointer of the dial indicator or micrometer rotates clockwise, it means that the height of the measuring point relative to the reference surface increases, that is, the measuring point is higher than the reference surface, and the value is positive. When the pointer of the dial indicator or micrometer rotates counterclockwise, it means that the height of the measuring point relative to the reference surface decreases, that is, the measuring point is lower than the reference surface, and the value is negative.

[0097] For ease of understanding, let's take an example: suppose that when measuring the flatness of a guide rail, the measuring head of the dial indicator is perpendicular to the surface of the guide rail, and measurements are taken at different positions of the guide rail. If the reading of the dial indicator is +0.03mm at a certain measuring point, it means that the point is 0.03mm higher than the reference surface; and if the reading is -0.02mm at another measuring point, it means that the point is 0.02mm lower than the reference surface.

[0098] By recording and analyzing the values ​​of these measurement points, the contour curve of the guide rail surface can be drawn, and then the flatness of the guide rail can be evaluated to see whether it meets the design requirements.

[0099] It should be clear that the present application is different from the conventional measurement method using a single dial indicator or a single micrometer. The digital display three-point contact measuring device in the present application includes three high-precision contact digital sensors, which are distributed in a triangular shape. The three-point fixed surface, i.e., face-to-face measurement method, is adopted to truly realize the detection of parallelism between surfaces, making the detection data more real and scientific.

[0100] The optional, high-precision contact digital sensor is the Keyence GT2 series, which adopts a new principle grating scale pulse system, uses an ultra-clear CMOS sensor for high-speed shooting, and reads its movement from the "absolute value scale" engraved with a slit pattern that varies depending on the position. It has an advanced detection principle with ultra-high precision in its class and does not produce tracking errors even at high speeds. It achieves ultra-high precision in its class, with a resolution of 0.1μm and an accuracy of 1μm. It also has a long life of more than 200 million consecutive detections, which can reduce maintenance hours caused by sensor head damage. In addition, it also supports a rich open field network. It can also be used with software, and the data measured by the high-precision contact digital sensor can be transmitted to the console 1 in real time and displayed through the software in the computer of the console 1.

[0101] Embodiment 2: Embodiment 2 of the present invention provides a linear guide pair accuracy detection method, comprising: The first step: Place the linear guide pair to be tested on the installation station of the automatic testing platform 4, then insert the locking screw 153 into each installation countersunk hole of the linear rail 13 and rotate it by a certain angle, so that the block 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, and then the operating table 1 synchronously controls multiple lower oil cylinders 151 to shorten the set length so as to pull down the locking screw 153 with a fixed pulling force F, and preliminarily assemble the linear guide pair to be tested on the installation station; Step 2: Control the linear drive mechanism to drive the slide saddle 5 to move to the first end of the linear rail 13, the operating table 1 controls the linear module mechanism 11 to drive the hydraulic slider clamp 16 to approach the slider 14, and then controls the slider locking cylinder 162 to extend a set length to clamp the slider 14, and then the operating table 1 controls the linear module mechanism 11 to drive the slider 14 to move to the second end of the linear rail 13; The third step: control the first Z-axis moving mechanism in the linear rail flatness measuring mechanism 8 to start, so that the second digital display three-point contact measuring device 810 is attached to the top surface of the linear rail 13, and control the linear drive mechanism to drive the sliding saddle 5 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 controls the lower oil cylinder 151 at that location to increase or decrease the downward 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 force on the locking screw 153 until the displacement at that location meets the set deviation range. When the second digital three-point contact measuring device 810 moves to the second end of the linear rail 13 , the operating table 1 records the tension values ​​applied by all lower cylinders 151 to the locking screws 153 , and then controls the linear drive mechanism to drive the sliding saddle 5 back to the first end of the linear rail 13 .

[0102] Step 4: Control the first X-axis moving mechanism and the first Z-axis moving mechanism in the linear rail flatness measuring mechanism 8 to start, so that the first digital display three-point contact measuring device 805 and the second digital display three-point contact measuring device 810 are respectively attached to the side surface and the top surface of the linear rail 13; Then, the linear drive mechanism is started to drive the sliding saddle 5 toward the slider 14. After the slider flatness measuring mechanism 9 reaches the specified position, the second X-axis moving mechanism and the second Z-axis moving mechanism in the slider flatness measuring mechanism 9 are controlled 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 and top surface of the slider 14.

[0103] Step 5: Start the first precision test, control the linear drive mechanism to drive the sliding saddle 5 to move the set distance at the set speed, and use the second digital display three-point contact measuring device 810 and the fourth digital display three-point contact measuring device 902 to measure the parallelism deviation data of the top surface of the linear rail 13 relative to the top surface of the slider 14; use the first digital display three-point contact measuring device 805 and the third digital display three-point contact measuring device 901 to measure the parallelism deviation data of the side surface of the linear rail 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 the linear guide pair.

[0104] Step 6: The operating table controls all lower oil cylinders 151 to extend to a set length m2 to facilitate lateral adjustment of the linear rail 13.

[0105] Step 7: Control all the side oil cylinders 121 to extend to a set length so that the linear rail 13 is pressed onto the lateral mounting surface 403 of the mounting station, and then control the first X-axis moving mechanism in the linear rail flatness measuring mechanism 8 to start, so that the first digital display three-point contact measuring device 805 is attached to the side of the linear rail 13; The linear drive mechanism is controlled to drive the sliding saddle 5 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, the coordinate at that location is marked, and the operating table controls the side oil cylinder 121 at that coordinate to increase or decrease the tightening force on the side of the linear rail 13, and then continues to measure the displacement at that coordinate. If it still exceeds the set deviation range, the tightening force on the side of the linear rail 13 is continued to be increased or decreased until the displacement at that coordinate meets the set deviation range; When the first digital three-point contact measuring device 805 moves to the second end of the linear rail 13 , the operating table 1 automatically records the pressure values ​​applied by all side cylinders 121 to the linear rail 13 , and then controls the linear drive mechanism to drive the sliding saddle 5 back to the first end of the linear rail 13 .

[0106] Step 8: Control all lower oil cylinders 151 to shorten the set length m2.

[0107] Step 9: 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 step 5, 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, the operating table 1 records again the tension values ​​applied by all the lower cylinders 151 to the locking screws 153 and the pressure values ​​applied by all the side cylinders 121 to the linear rail 13, and records the tension values ​​applied by all the lower cylinders 151 to the locking screws 153 and the pressure values ​​applied by all the side cylinders 121 to the linear rail 13 in the manual, so as to serve as a reference for subsequent actual installation.

[0108] In the description of the present invention, it should be noted that the terms "upper", "lower", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are 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 limiting 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.

[0109] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the inside of two components. For ordinary technicians in this field, 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 specified, "plurality" means two or more.

[0110] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should 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.

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 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.

4. The linear guideway pair precision automatic detection system according to claim 3 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.

5. 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).

6. 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.

7. 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).

8. The linear guideway pair precision automatic detection system according to claim 7, 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).

9. 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).

10. A linear guide 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.

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