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CN-121977730-A - Rolling linear guide pair slider friction force and pre-compaction grade evaluation measuring device

CN121977730ACN 121977730 ACN121977730 ACN 121977730ACN-121977730-A

Abstract

The invention discloses a device for evaluating and measuring friction force and pre-pressing grade of a sliding block of a rolling linear guide pair, which comprises an experiment platform, a high-speed uniform linear feeding unit, a clamping mechanism or a fixing mechanism, a real-time dynamic friction force measuring unit, a sliding block retainer, a sliding block supporting seat, a control unit and a computing unit, wherein the high-speed uniform linear feeding unit is arranged on the experiment platform and comprises a servo motor and a high-precision ball screw linear slide rail driven by the servo motor, the high-precision ball screw linear slide rail is arranged in parallel with the high-precision ball screw linear slide rail, the clamping mechanism or the fixing mechanism is used for fixing the linear guide rail to be tested, the sliding block retainer and the sliding block supporting seat are used for controlling movement of a part and displaying of data, and the computing unit is used for evaluating pre-pressing grade according to a numerical value obtained by testing pressure. The invention can be adapted to the tracks and sliders to be tested with different specifications, or realize continuous grabbing and placing of a plurality of sliders, thereby realizing the automation of measurement to a great extent, reducing the error rate caused by manual operation and improving the working efficiency.

Inventors

  • HUANG GUOQIN
  • YUE HONGYANG
  • HUANG WEIFENG
  • WANG HAIXU

Assignees

  • 华侨大学

Dates

Publication Date
20260505
Application Date
20260115

Claims (10)

  1. 1. The utility model provides a rolling linear guide pair slider frictional force and pre-compaction grade evaluation measuring device which characterized in that includes: The high-speed uniform linear feeding unit comprises a servo motor, a high-precision ball screw linear slide rail, a linear guide rail to be tested, a clamping mechanism or a fixing mechanism, wherein the high-speed uniform linear feed unit is arranged on the experimental platform and comprises a servo motor and a high-precision ball screw linear slide rail driven by the servo motor; the dynamic friction force real-time measurement unit comprises a to-be-measured module arranged on a to-be-measured linear guide rail, wherein a sensor fixing mechanism is arranged on a sliding mechanism of a high-precision ball screw linear guide rail, and at least two oppositely arranged force measuring sensors are arranged on the sensor fixing mechanism; The device also comprises a slide block retainer and a slide block supporting seat, wherein the slide block supporting seat is arranged behind the end part of the linear guide rail to be tested, the slide block retainer can be inserted into the slide block to be tested, and the slide block retainer and the upper half part of the slide rail to be tested have the same section shape so as to form a guide rail extending structure by being matched with the slide block supporting seat, and The control unit is used for controlling the movement of the component and the data display, and the calculating unit is used for carrying out pre-pressing grade assessment according to the value obtained by the test pressure.
  2. 2. The device of claim 1, wherein the sensor fixing mechanism comprises an adaptive lifting device which is fixedly connected with a moving part of the screw rod sliding group through a sliding group connecting piece to form a synchronous movement relationship; The self-adaptive lifting device is square or is formed by splicing a plurality of plates, a plurality of positioning holes are formed in the side face along different heights, the gripper connecting piece is sleeved on the self-adaptive lifting device and can be positioned at different heights through positioning pins; The sliding block head sleeve is sleeved and fixed on the sliding block to be tested and forms a synchronous motion relation, the middle of the top of the sliding block head sleeve is upwards protruded to form a convex edge, during testing, the overturning gripper is overturned above the sliding block head sleeve, and the convex edge is inserted between the two force measuring sensors, so that no matter in which direction the sliding block to be tested moves along the track to be tested, the sensor is stressed.
  3. 3. The device according to claim 1, wherein a thrust sliding block which is matched with the screw rod and can move along the left-right direction of the sliding rail is arranged on the high-precision ball screw linear sliding rail, a force measuring cantilever is pivoted on the thrust sliding block and can be turned upwards to be in a vertical state or be placed above the linear sliding rail to be measured under the action of a first stepping motor, two sensor fixing columns are arranged on the bottom surface of the force measuring cantilever, a force measuring sensor is arranged on the opposite side of each sensor fixing column, and an electrified magnet is arranged on the force measuring cantilever and used for adsorbing a sliding block head sleeve on the sliding block to be measured.
  4. 4. The device of claim 1, further comprising an automatic loading and unloading unit, wherein the automatic loading and unloading unit comprises a feeding mechanism for storing and providing a tested slide block, a discharging mechanism for storing a finished test slide block and a grabbing mechanism for transferring the slide block among the feeding mechanism, the test station and the discharging mechanism, the feeding mechanism and the discharging mechanism are respectively arranged on two sides of the linear guide rail to be tested, and the grabbing mechanism can move to grab and release the slide block between the feeding mechanism and the discharging mechanism.
  5. 5. The device of claim 4, wherein the grabbing mechanism of the automatic loading and unloading unit comprises a support arranged above the platform, a first linear slide rail in the front-rear direction is arranged on the support, a movable slide table capable of sliding along the first linear slide rail is arranged on the first linear slide rail, a first slide block connecting piece is arranged on the movable slide table to fixedly connect a third linear slide rail, the third linear slide rail is arranged in the vertical direction, meanwhile, an electromagnet is fixed on the movable slide table on the third linear slide rail through a second slide block connecting piece, and grabbing and placing of a test slide block are achieved through powering on and powering off the electromagnet.
  6. 6. The device of claim 4, wherein the feeding mechanism is vertically inserted on the experiment platform and comprises a third servo motor, a feeding bin handle, a feeding bin, a third sliding block connecting piece and a third linear sliding rail, wherein the feeding bin and the third linear sliding rail are arranged in parallel in the vertical direction, the feeding bin comprises a square frame, a plurality of tested sliding blocks can be stacked in the square frame, the feeding bin handle is arranged at the top of the feeding bin and is convenient for carrying the feeding bin, the third sliding block connecting piece is fixedly connected with the sliding blocks of the third linear sliding rail so as to move up and down along the third linear sliding rail, and at least one part of the third sliding block connecting piece can be transversely inserted into the square frame of the feeding bin so as to lift the tested sliding blocks upwards from the lower surface of the experiment platform to the upper surface of the experiment platform for suction; The blanking mechanism comprises a blanking bin and a second pneumatic push rod, wherein the blanking bin is a channel with a square section and is vertically inserted into the experimental platform, the tested sliding block can slide from the top to the bottom of the channel from top to bottom after being measured, and the second pneumatic push rod is arranged beside the bottom of the blanking bin and can push the sliding block away from the bottom of the blanking bin.
  7. 7. A measurement method using the device according to any one of claims 1 to 6, comprising the steps of: The method comprises the steps of arranging a sliding block to be tested on an initial position to be tested after a linear guide rail to be tested in a sliding manner, fixing the sliding rail to be tested through a clamping mechanism or a fixing mechanism, and horizontally pushing the sliding block from the initial position to be tested to the track to be tested; the sliding block head sleeve is sleeved on the sliding block to be tested, and the sliding block head sleeve is driven by a high-speed uniform linear feeding unit arranged on the experimental platform, so that the sliding block to be tested slides along the linear guide rail to be tested; The method comprises the steps of enabling a slider head on a detected slider to interact with a force transducer in a uniform reciprocating motion process, collecting forward and reverse friction force data in real time through the force transducer, enabling the slider to return to an initial to-be-detected position from a to-be-detected track after data collection, displaying readings on a display screen, and automatically matching assessment results based on a pre-compression grade database, wherein the pre-compression grade assessment method of the pre-compression grade database comprises the following steps: Ff=ce Cm Ci F measurement The Ff is a final friction force acquisition and correction result, which is a final value used for comparison with a pre-compression grade database after system correction; ce is an empirical coefficient for multiple measurement, is used for correcting the tiny deviation of a measurement system, improves the stability of long-term measurement, and has a value of 0.98; cm is the corresponding friction coefficient measured for different times, the running-in effect of the sliding block, namely the change rule of the friction force after primary operation and multiple operation is considered, and the value range is 0.96-0.98; Ci is the running inertia coefficient of the motor, and is used for compensating the tiny influence of inertia force generated by the servo motor when the servo motor is started and stopped on a measurement result, wherein the value range is 0.97-0.98; "F measurement" is the measured data; the judgment criterion is that the measured Ff value must completely fall in the range of the minimum value (Min) and the maximum value (Max) of the corresponding model and the selected pre-pressing grade, and the square is qualified; The method comprises the steps of selecting a model corresponding to a to-be-detected sliding block in a touch screen interface, measuring the peak, trough and amplitude of data of the sliding block by the touch screen according to the measured result of the sliding block corresponding to the model, matching the model with the pre-pressing grade of a guide rail corresponding to the model by a database according to the line drawing result presented on an image of the touch screen, and determining the pre-pressing grade of the sliding block.
  8. 8. The method of claim 7, wherein the measuring and adjusting step is preceded by a slider loading step comprising attracting the slider manually or by an electromagnet, wherein the slider is moved to the test station by a coordinated movement of the first linear rail and the third linear rail after the slider is attracted by the electromagnet and positioned by a pneumatic push rod onto the rail under test.
  9. 9. The method according to claim 7, wherein the step of collecting the frictional force data includes detecting forward and reverse reciprocating directions, the load cell is alternately stressed on both sides of the convex edge of the slider head cover, and the control unit processes the collected data and generates a thrust-displacement curve.
  10. 10. The measuring method according to claim 7, further comprising a step of replacing the slide after the test with the original station, taking out the slide by the holder, replacing the Marble Dan Zhi plate or adjusting the control parameters to realize the batch test, continuously performing the friction force measurement and the pre-compression level matching of the multi-specification rail pair, or The automatic loading and unloading unit is used for material changing, a plurality of tested sliding blocks are stored in the feeding mechanism, are grabbed by the grabbing mechanism and released to the testing station for testing, the sliding blocks are moved to the discharging mechanism by the grabbing mechanism after testing, and then the next tested sliding block is grabbed from the feeding mechanism.

Description

Rolling linear guide pair slider friction force and pre-compaction grade evaluation measuring device Technical Field The invention relates to a device for evaluating and measuring friction force and pre-compression grade of a sliding block of a rolling linear guide rail pair. Background The rolling linear guide rail pair is a mechanical transmission system used in engineering and industrial application and is used for realizing linear motion and high-precision positioning of objects. It consists of a guide rail and a sliding block, wherein the guide rail provides a linear motion track, and the sliding block is responsible for smooth sliding. The linear guide rail pair is used as a precise transmission part and is widely applied to the fields of high-end equipment such as industrial automation equipment, numerical control machine tools, robots, electronic manufacturing equipment and the like. The sliding block is a moving part in the rolling linear guide rail pair, and can freely slide along the track of the guide rail by contacting with the surface of the guide rail. The main function of the slide block is to bear vertical and transverse loads, and meanwhile, stable and accurate movement of the guide rail pair is ensured. It reduces friction by means of internal rolling elements, thus reducing energy losses. The high-precision motion platform is a core unit for realizing precision operation of high-end equipment, and the performance of the high-precision motion platform depends on the guiding precision, the running sensitivity, the low-friction characteristic and the long-term precision maintaining capability of the rolling linear guide rail pair. The difference of the requirements of different motion scenes on the clearance and rigidity of the guide rail pair is obvious. At present, the universal sliding blocks matched with the linear guide rails with the same specification are difficult to realize prepressing accurate control through steel ball size adjustment, and the problems that the elastic displacement of a guide rail pair is overlarge, abrasion is aggravated and the like are easily caused under a specific scene, so that the stability of a platform and the service life of parts are influenced. Therefore, the customization adaptation of the performance of the guide rail pair is realized through steel ball size fine adjustment and pre-compaction optimization, and the multi-scene use requirement of the high-precision motion platform is met. When the high-precision motion platform moves, steel balls in the sliding blocks roll in grooves of the support, and the abrasion loss of the support is distributed on each steel ball, so that the service life of the linear guide rail is prolonged. By installing steel balls with specific sizes in the sliding blocks, gaps between the support and the guide rail are eliminated, and the stability of the guide rail system can be improved well. Because the acting force used on the steel ball is too large and is subjected to the pre-loading for too long, the movement resistance of the bracket is enhanced, the abrasion is increased, and the balance failure and the like can occur. If the acting force acting on the steel ball is too small, the rigidity of the linear guide rail pair is obviously reduced due to the too large gap, the vibration is increased, the stability is reduced, and the movement precision, the bearing capacity and the like of the linear guide rail pair are further affected. Therefore, the linear guide rail pair needs to be matched with a specific sliding block in a specific motion scene, the pre-pressing grade of the linear guide rail pair is accurately obtained, and the improvement of the reliability of the platform and the extension of the service life are facilitated. Through market research, related data is referred to. The pre-pressing grade of most rolling linear guide rail pairs is determined by manual measurement by workers and is adapted to the manual measurement by workers. The method has the advantages that the manual operation flow is complex, the sliders are required to be installed, debugged and detected one by one, time and labor are consumed, accuracy of assessment results is easily affected by manual operation errors, the switching period is long, and the rapid detection requirement in batch production is difficult to meet. Under most conditions, the flatness and positioning accuracy of the guide rail in the detection process cannot be guaranteed through manual detection, so that the fluctuation of measurement data of the pre-pressing level and the friction force is large, and the reliability is insufficient. These problems not only restrict the improvement of the production efficiency of the guide rail slider, but also adversely affect the quality stability of downstream equipment. Therefore, the testing device for efficiently measuring the friction force of the sliding blocks of the rolling linear guide rail pair in batches, obtaining the