A performance testing device for the reversing mechanism of a rolling linear guide pair

Abstract

This invention relates to a performance testing device for a reversing device of a rolling linear guide pair, comprising: two end caps: arranged opposite each other, each end cap housing a reversing device under test, the reversing device under test having a curved raceway, and the reversing devices under test in the two end caps also being opposite each other; a slotted raceway: connecting one end of the two curved raceways, having a groove; a return ball raceway: connecting the other end of the two curved raceways; the curved raceways, slotted raceways, and return ball raceways of the two reversing devices under test together form a closed running-in raceway; a striking ball: located within the running-in raceway, rolling within the running-in raceway under actuation, repeatedly impacting the curved raceway during rolling; a shift fork: having a shift piece extending into the slotted raceway, the shift piece being used to shift the striking ball; a vibration sensor for monitoring the vibration of the reversing device under test; and a timing belt: connected to the shift fork, the timing belt being driven to reciprocate, driving the shift fork to reciprocate to shift the striking ball.

Description

Technical Field

[0001] This invention belongs to the field of performance testing of rolling linear guide pairs, and in particular, a performance testing device for a reversing device of a rolling linear guide pair. Background Technology

[0002] Rolling linear guide pairs are core functional components of high-end CNC machine tools, mainly composed of guide rails, sliders, balls, and a reversing mechanism. During the high-speed operation of the rolling linear guide pair, the reversing mechanism is subjected to strong impacts from the balls, making it the most easily damaged part. Therefore, designing a running-in test bench specifically capable of testing the various performance characteristics of the guide pair's reversing mechanism has significant engineering practical value.

[0003] Patents CN202010168935.6 and CN202010447870.9 disclose a ball screw and rolling linear guide reverser friction torque detection device, which provides a detection device that can simultaneously detect the screw friction torque and the guide pair friction force. However, since the reverser is not isolated as the object of detection, the detected information also includes information about other parts such as nuts and sliders. There is no separate running-in and testing specifically for the reverser.

[0004] Patent document CN202010173370.0 discloses a device for detecting the frictional resistance torque of a lead screw reverser, which also tests the entire lead screw and nut assembly as a whole, without separately testing and running-in the reverser. Furthermore, this patent targets the reverser of the lead screw assembly, and its structure differs significantly from that of a guide rail reverser, requiring different running-in and testing procedures. Summary of the Invention

[0005] The purpose of this invention is to provide a testing device for detecting the performance of the reverser of a rolling linear guide pair, which can specifically test the reverser's impact resistance, wear resistance and other properties.

[0006] The technical solution adopted by the present invention to solve the above problems is: a performance testing device for a rolling linear guide pair reverser, comprising:

[0007] End caps: There are two end caps, which are arranged opposite each other. Each end cap contains a reverser under test, which has a turning raceway. The reversers under test in the two end caps are also opposite each other.

[0008] Grooved raceway: It is installed between the two end caps and connects one end of the two curved raceways. It has a groove, and the extension direction of the groove is parallel to the extension direction of the grooved raceway.

[0009] Return ball raceway: erected between the two end caps, connecting the other ends of the two curved raceways;

[0010] The turning raceway, slotted raceway, and return ball raceway of the two tested reversers together form a closed running-in raceway.

[0011] Impact ball: Located in the running-in raceway, it is propelled and rolls in the running-in raceway, repeatedly impacting the turning raceway during the rolling process to test the reverser under test.

[0012] Shift fork: has a sprocket that extends into the slotted raceway, the sprocket being used to sprocket the ball, causing the ball to roll within the running-in raceway;

[0013] Vibration sensor: installed on the end cap to monitor the vibration of the reverser under test;

[0014] Synchronous belt: connected to the shift fork, the synchronous belt is parallel to the extension direction of the shift groove, the synchronous belt is driven to reciprocate, driving the shift fork to repeatedly move the impact ball, so that the impact ball rolls back and forth along the running-in raceway in a clockwise or counterclockwise direction.

[0015] Drive mechanism: Used to drive the synchronous belt to reciprocate.

[0016] Preferably, a cover plate is provided on the inner side of the end cap, and the cover plate is integrally connected with the end cap. The cover plate blocks the turning raceway from the inside of the end cap to prevent the ball from jumping out when it passes through the turning raceway.

[0017] In testing, it is often necessary to conduct multiple tests in the same group to compare the results. Therefore, it is necessary to conduct simultaneous tests on multiple reversers under the same test conditions. Therefore, this application further sets that the two end caps each have n reversers under test. The n reversers under test on the two end caps correspond to each other in pairs. The two reversers under test that correspond to each other together form an independent running-in raceway. A total of n independent running-in raceways are formed between the two end caps, where n is a natural number greater than or equal to 2.

[0018] As an embodiment of this application, there are n shift forks, each of which is connected to the timing belt. The n shift forks act independently on the n running-in raceways through the shift plates.

[0019] In another embodiment of this application, there is one shift fork, which has n shift plates, each of which independently acts on the n running-in raceways.

[0020] Preferably, the n running-in raceways are arranged around the shift fork, and the slotted raceway of each running-in raceway is close to the shift fork, with the slot of the slotted raceway facing the shift fork, so that the shift fork's pawl extends into the slot.

[0021] Preferably, the testing apparatus of this application further includes a worktable, and the end cap is temporarily fixedly mounted on the worktable by a positioning block and a clamping device. The positioning block includes a locking block and a limiting protrusion. The locking block is connected to the limiting protrusion, and the limiting protrusion blocks the bottom inner or outer side of the end cap. The worktable has multiple locking grooves, and the locking block is temporarily fixed to one of the locking grooves on the worktable by a locking member. The clamping device includes an elastically configured pressing block, which presses the end plate downward on the worktable under elastic action.

[0022] Preferably, the clamping device includes a clamping base, which is fixedly mounted on the workbench. The clamping block is hinged to the clamping base and a tension spring is provided between them. Under the action of the tension spring, the clamping block always has a downward tendency. The clamping block also has a handle to facilitate operation of the clamping block to press down the reverse device being tested.

[0023] Preferably, the cross-section of the slotted raceway is an open circle, and the central angle of the corresponding groove is 70° to allow the paddle to extend or move along the groove. However, the central angle of the groove should not be too large to avoid affecting the rolling trajectory of the ball. The cross-section of the return ball raceway is a closed circle. The purpose of the return ball raceway is to allow the ball to reciprocate between the measured reversers of the two end caps.

[0024] Preferably, the drive mechanism includes a servo motor, a driving pulley, a driven pulley, a driven shaft, and a driven bearing housing. The output shaft of the servo motor is connected to the driving pulley, and the synchronous belt is tensioned on the driving pulley and the driven pulley.

[0025] Compared with the prior art, the advantages of the present invention are as follows:

[0026] (1) By setting up a running-in raceway that includes the reverser under test, and using impact balls rolling within the running-in raceway to impact the reverser under test, the impact resistance and wear resistance performance of the reverser are tested. This design realizes the running-in and testing of the reverser performance specifically for rolling linear guide pairs.

[0027] (2) By using a vibration sensor to monitor the reverser, the vibration data of the directional device can be obtained in real time.

[0028] (3) Using a servo motor as the drive, the impact speed of the ball can be controlled by adjusting the motor speed, and the number of steel balls can be adjusted by changing the length of the raceway, so as to conduct performance tests of the reverser under different working conditions.

[0029] (4) Using synchronous belt drive can ensure a constant transmission ratio and controllable ball speed, and can simulate the movement of steel balls in the guide rail pair at a certain speed. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the test device in an embodiment of the present invention;

[0031] Figure 2 for Figure 1 A magnified view of a portion of the positioning block;

[0032] Figure 3 This is a schematic diagram of the structure of the testing device without a workbench in an embodiment of the present invention;

[0033] Figure 4 This is a partial exploded view of the end cap, slotted raceway, and return ball raceway in an embodiment of the present invention;

[0034] In the diagram, 1 is the servo motor, 2 is the driving pulley, 3 is the driven pulley, 4 is the synchronous belt, 5 is the shift fork, 6 is the end cover, 7 is the reverser, 8 is the slotted raceway, 9 is the return ball raceway, 10 is the vibration sensor, 11 is the cover plate, 12 is the slot, 13 is the locking block, 14 is the limit protrusion, 15 is the clamping block, 16 is the clamping base, 17 is the tension spring, 18 is the handle, 19 is the locking groove, 20 is the worktable, 21 is the floating support, and 22 is the motor worktable. Detailed Implementation

[0035] The present invention will be further described in detail below with reference to the accompanying drawings. The embodiments described are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0036] The performance testing device for the reversing device of the rolling linear guide pair in this embodiment includes: a servo motor 1, a driving pulley 2, a driven pulley 3, a driven shaft, a driven bearing housing, a synchronous belt 4, a shift fork 5, an end cover 6, a reversing device 7, a slotted raceway 8, a return ball raceway 9, impact balls, and a vibration sensor 10. Their quantity and assembly structure are described as follows:

[0037] There are two end caps 6, which are arranged opposite each other. Each end cap 6 has four reversers 7, which are distributed in the four corners of the top, bottom, left and right. The four reversers 7 of the two end caps 6 correspond one-to-one. The reversers 7 have turning raceways. The reversers 7 in the two end caps 6 are also opposite each other.

[0038] Grooved raceways 8: There are four in total, each consisting of four open-section circular tubes with a central angle of 70° corresponding to the opening. The four grooved raceways 8 are installed between the two end caps 6, connecting the inner ends of two opposing curved raceways. Each grooved raceway 8 has a continuous groove 12, the extension direction of which is parallel to the extension direction of the grooved raceway 8. The groove 12 is the opening of the circular tube, with its opening facing inwards. Return ball raceways 9: There are four in total, each consisting of four closed-circle circular tubes, installed between the two end caps 6, connecting the outer ends of two opposing curved raceways. The two opposing reversing raceways, a slotted raceway 8, and a return ball raceway 9 together form a closed running-in raceway. In this embodiment, there are four running-in raceways, each containing 60 steel balls as impact balls. These impact balls, when propelled, roll within the running-in raceway, repeatedly impacting the slotted raceway to detect impacts on the reversing units. A fork 5, located in the middle of the four slotted raceways 8, has four prongs that can extend into the raceways, simultaneously propelling four rows of balls to move synchronously. The fork 5 is connected to a timing belt 4, whose rotation direction is parallel to the extension direction of the slot 12. The timing belt 4 reciprocates, driving the fork 5 to reciprocate along the slot 12, causing the impact balls to roll back and forth along the running-in raceway, repeatedly impacting the reversing units at both ends. Two vibration sensors 10 are fixedly mounted on the end caps to monitor the vibration of the reversing units.

[0039] A cover plate 11 is provided on the inner side of the end cover 6. The cover plate 11 is integrally connected to the end cover 6. The cover plate 11 blocks the curved raceway from the inside of the end cover 6 to prevent the ball from jumping out when passing through the curved raceway. Since the inner curved raceway (curved raceway) of the reverser 7 works together with the linear guide rail (grooved raceway and return ball raceway) to fix the steel ball, the shape of the curved raceway of the reverser here is irregular. If the raceways are directly connected, there will be a large gap. During high-speed running-in, the ball can easily jump out, which seriously affects safety. Therefore, a cover plate 11 is provided on the inner side of the end cover 6 as a supplementary and fixing component. It is fixed together with the end cover by screws to form a load-bearing structure.

[0040] The four running-in raceways are arranged around the shift fork 5, and the slotted raceways 8 of each running-in raceway are located on the inner side, that is, close to the shift fork. The slots 12 of the slotted raceways 8 face the shift fork, so that the four paddles of the shift fork extend into the slots 12 respectively, thereby agitating the impact balls in the slotted raceways and achieving the synchronization of the four running-in raceway tests.

[0041] The end cap 6 containing the reverser is mounted on the workbench 20. The end cap 6 is temporarily fixed to the workbench by positioning blocks and clamping devices. The positioning blocks include locking blocks 13 and limiting protrusions 14. The locking blocks 13 and limiting protrusions 14 are integral. The locking blocks 13 are locked with bolts, nuts, and locking grooves 19. The limiting protrusions 14 block the inner or outer side of the bottom of the end cap. Each end cap is equipped with two positioning blocks. The limiting protrusions 14 of one positioning block block the inner side of the bottom of the end cap, and the limiting protrusions 14 of the other positioning block block the outer side of the bottom of the end cap, thereby achieving the positioning of the end cap 6. The workbench 20 is provided with multiple parallel T-shaped locking grooves 19, allowing for the selection of locking grooves with different spans according to the size of the end cap.

[0042] The clamping device includes a clamping block 15 and a clamping base 16. The clamping base 16 is fixedly mounted on the worktable 20. The clamping block 15 is located on top of the clamping base 16 and is hinged to the clamping base 16. A tension spring 17 is provided between the two. Under the action of the tension spring 17, the clamping block 15 always has a downward pressing tendency. The clamping block 15 also has a handle 18 for easy operation. The clamping device is controlled by the handle 18. Operating the handle causes the clamping block to press against the top of the end cap, fixing it on the worktable for temporary fixation of the end cap.

[0043] The clamping device requires two positioning blocks to adjust the end cap, ensuring that components such as the curved raceway, slotted raceway, and return ball raceway are properly installed and smoothly connected. The clamping device is then operated to press down from above, allowing the device to successfully complete its break-in process. The clamping device should be matched to the appropriate size of the end cap.

[0044] Synchronous belt 4 requires high-frequency forward and reverse rotation. The drive mechanism of synchronous belt 4 uses servo motor 1 as its power source. Synchronous belt 4 employs a synchronous gear belt. Additionally, a driving pulley 2, a driven pulley 3, a driven shaft, and a driven bearing housing are prepared. The driving pulley 2 is directly driven to rotate by servo motor 1 on its output shaft. The driven pulley 3 is fitted onto the driven shaft, which is supported by the driven bearing housing. Synchronous belt 4 is then tensioned on the driving pulley 2 and the driven pulley 3. Because the driven pulley 3 needs to move relative to the driving pulley 2 to adjust the tension of the synchronous belt, a clearance needs to be reserved around the bearing housing on the support platform. During the running-in test, the forward and reverse rotation of the servo motor drives the shift forks on the synchronous belt to push the impact balls in the four running-in raceways back and forth, thus simulating the running-in impact experienced by the reverser. The servo motor 1 is also connected to the floating support 21 by bolts and nuts, and a flat washer is installed between the servo motor 1 and the floating support 21. The floating support 21 is then fixed to the motor base 22 by bolts and nuts. The motor base 22 is provided with two T-slots for adjusting the installation position.

[0045] The synchronous toothed belt uses steel wire rope or fiberglass rope as the reinforcing layer, and is covered with polyurethane or neoprene rubber on the outside. The inner circumference of the belt is made into a tooth shape so that it meshes with the driving pulley 2 and the driven pulley 3. Because of the added reinforcing layer, the synchronous toothed belt has small deformation after bearing load and can keep the circumferential pitch of the toothed belt unchanged. Therefore, there is no relative slippage between the belt and the pulley, which ensures synchronous transmission and a constant transmission ratio, and can adapt to the output of motion required for high-speed reciprocating motion.

[0046] In addition to the above embodiments, the present invention also includes other embodiments. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.

Claims

1. A performance testing device for a reverse device of a rolling linear guide rail pair, characterized in that, It comprises: End cover: the end cover has two, opposite, each end cover is provided with a measured reverse, the measured reverse has a corner track, two end cover measured reverse is also opposite; Groove track: erected between two said end cover, connecting two corner track one end, has a slot, the extension direction of the slot is parallel to the extension direction of the groove track; Back to the pearl track: erected between two said end cover, connecting two corner track the other end; Two measured reverse corner track, a groove track and a back to the pearl track together constitute a closed run-in track; Ball: located in the run-in track, is driven in the run-in track, repeatedly hit the corner track in the process of rolling to test the measured reverse; Fork: has a piece of the inside of the groove track, the piece is used to drive the ball; Vibration sensor: set on the end cover for monitoring the vibration of the measured reverse; Synchronous belt: connected with the fork, the synchronous belt is parallel to the extension direction of the slot, the synchronous belt is driven reciprocating operation, drive the fork to reciprocating drive the ball, realize the ball along the run-in track clockwise or counterclockwise direction reciprocating rolling; Driving mechanism: for driving the synchronous belt reciprocating operation. 2.The performance testing device for a rolling linear guide vice reverser according to claim 1, wherein: The inside of the end cover is provided with a cover plate, the cover plate is connected with the end cover as a whole, the cover plate blocks the corner track from the inside of the end cover, to avoid the ball jumping out through the corner track. 3.The performance testing device for a rolling linear guide vice reverser according to claim 1, wherein: Two said end cover has n measured reverse, two end cover on the n measured reverse two two corresponding, corresponding to two measured directioner jointly constitute a circle independent of the run-in track, two end cover between a total of n independent run-in track, n is greater than or equal to 2 natural number.

4. The rolling linear guide vice reverser performance testing device according to claim 3, characterized in that: The fork has n, each fork is connected with the synchronous belt, n said fork through the piece respectively one one corresponding independent effect in n said run-in track ball.

5. The rolling linear guide vice reverser performance testing device according to claim 3, wherein: The fork has 1, the fork has n piece, n said piece respectively one one corresponding independent effect in n said run-in track ball. 6.The performance testing device for a rolling linear guide vice reverser according to claim 5, wherein: N said run-in track around the fork, and each run-in track said groove track near the fork, the groove track said slot towards the fork, so that the piece of the fork into the slot. 7.The performance testing device for a rolling linear guide vice reverser according to claim 1, wherein: It also includes a workbench, the end cover is temporarily fixed on the workbench through the positioning block and clamping device, the positioning block includes locking block and limit convex block, the locking block is connected with the limit convex block, the limit convex block is blocked in the bottom inside or outside of the end cover, the workbench has multiple locking grooves, the locking block is temporarily fixed at a certain locking groove of the workbench by locking piece; The clamping device includes a spring loaded pressure block, the pressure block is pressed on the workbench under the action of spring. 8.The performance testing device for rolling linear guide vice reverser according to claim 7, wherein: The clamping device includes a clamping base, the clamping base is fixedly arranged on the workbench, the pressure block is hinged with the clamping base, and a tension spring is further arranged between the pressure block and the clamping base. Under the action of the tension spring, the pressure block always has a downward trend, and the pressure block further has a handle. 9.The performance testing device for a rolling linear guide vice reverser according to claim 1, wherein: The cross section of the slotted raceway is an open circle, and the corresponding central angle of the slotted raceway is 70 degrees; the cross section of the return raceway is a closed circle. 10.The performance testing device for a rolling linear guide vice reverser according to claim 1, wherein: The driving mechanism comprises a servo motor, a driving pulley, a driven pulley, a driven shaft and a driven bearing seat, the output shaft of the servo motor is connected with the driving pulley, and the synchronous belt is tensioned on the driving pulley and the driven pulley.

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