Geometric parameter measuring instrument for cross roller guide rail profile

Abstract

A cross roller guide rail profile geometric parameter measuring instrument comprises a rotary table mechanism, a measured guide rail, a measured guide rail clamping mechanism, a Z motion axis structure and an X motion axis structure. The rotary table mechanism is used for driving the detected guide rail to rotate; the tested guide rail clamping mechanism is used for clamping a tested guide rail on the rotary table mechanism; the Z motion axis structure is used for realizing the lifting action of the whole measuring device, namely the reciprocating motion of the Z axis; the X motion axis structure is used for adjusting the laser displacement sensor to a proper position, namely the back-and-forth motion of the X axis; the measured guide rail clamping mechanism is fixed on the rotary table mechanism, the rotary table mechanism is fixed on the working platform through the shell, the X motion shaft structure is connected with the Z motion shaft through the support device, the Z motion shaft is fixed on the working platform through the shell, and the rotary table mechanism is matched with the Z motion shaft and the X motion shaft to achieve geometric measurement of the guide rail. According to the utility model, the clamping efficiency can be improved, and batch detection can be realized.

Description

Technical Field

[0001] The utility model belongs to the technical field of geometric parameter measurement of guide rail profiles, and particularly relates to a measuring instrument for geometric parameters of cross roller guide rail profiles. Background Art

[0002] With the development of numerical control machine tools towards high speed and precision, higher requirements are put forward for cross roller guide rails, which are one of the basic functional components of machine tools. Cross roller guide rails have the characteristics of high precision, high rigidity and high speed performance, and can significantly improve the machining accuracy and production efficiency of numerical control machine tools. Especially in equipment such as precision machining centers, CNC milling machines and CNC lathes, the application of cross roller guide rails can greatly improve the machining accuracy and stability of machine tools and ensure the machining quality of parts. The geometric parameters of the cross roller guide rail profile affect the accuracy and rigidity of the guide rail, and also affect whether the cross roller guide rail can be applied to fields such as semiconductor equipment, industrial robots, medical equipment and aerospace, depending on whether the geometric parameters of the guide rail profile meet the requirements.

[0003] Since there are too many measurement elements for this guide rail and the accuracy requirements are high, and the current measurement method still uses a ball head gear micrometer for batch measurement, this method is time-consuming and laborious, and it is difficult to obtain the measurement results through one detection for many measurement elements and it is not easy to achieve batch detection. Summary of the Utility Model

[0004] In order to overcome the above problems existing in the prior art, the purpose of the utility model is to provide a measuring instrument for geometric parameters of cross roller guide rail profiles. The measuring instrument realizes the error measurement of each geometric profile of the cross roller guide rail through the linear reciprocating motion of the probe movement mechanism in the X-axis and Z-axis directions, and the rotary table mechanism of the measured guide rail. The measured guide rail clamping mechanism selects a rotary center to ensure the rotary accuracy, and a 90° positioning block is set to ensure the installation accuracy and improve the clamping efficiency, and batch detection can be realized.

[0005] In order to achieve the above purpose, the technical scheme adopted by the utility model is:

[0006] A measuring instrument for geometric parameters of cross roller guide rail profiles, comprising a rotary table mechanism, a measured guide rail, a measured guide rail clamping mechanism, a Z movement axis structure and an X movement axis structure;

[0007] The rotary table mechanism is used to drive the measured guide rail to rotate;

[0008] The measured guide rail clamping mechanism is used to clamp the measured guide rail on the rotary table mechanism;

[0009] The Z movement axis structure is used to realize the lifting action of the overall measuring device, that is, the reciprocating movement of the Z-axis;

[0010] The X-axis movement structure is used to adjust the laser displacement sensor to a suitable position, i.e., the reciprocating movement of the X-axis.

[0011] The measured guide rail clamping mechanism is fixed to the rotary table mechanism. The rotary table mechanism is fixed to the working platform 4 through the housing. The X-axis movement structure is connected to the Z-axis through the bracket device 28. The Z-axis is fixed to the working platform 4 through the housing. The rotary table mechanism cooperates with the Z-axis and the X-axis to realize the geometric measurement of the guide rail.

[0012] The rotary table mechanism includes a second motor 12. A small gear 13 is arranged on the output shaft of the second motor 12. The small gear 13 meshes with a large gear 14. The large gear 14 is installed on a worm shaft 15. A worm 17 meshes with the middle position of the worm shaft 15. Bearing seats one 18 and two 19 are respectively installed at both ends of the worm shaft 15. The worm 17 is connected to the lower turntable 3 through a turntable 20.

[0013] The overall rotary table mechanism is arranged on the housing 11. The housing 11 is fixed to the working platform 4. The second motor 12 is installed on the protective cover 22 through a first bracket 21. The turntable 20 is a stepped cylinder.

[0014] The measured guide rail clamping mechanism is arranged on the lower turntable 3 as a whole. The measured guide rail clamping mechanism includes a lifting rack 46. The lifting rack 46 is fixed to the housing 45. The housing 45 is installed on the lower turntable 3. The lower turntable 3 is connected to the upper end of the stepped cylindrical turntable 20 by bolts. A fifth bearing seat 38 is installed at the connection position between the housing 45 and the lower turntable 3. A guide rail positioning block 52, a positioning block 53, and a lifting rack 46 are arranged on the fifth bearing seat 38. The guide rail positioning block 52 is installed at the upper end. The upper disc 48 and the positioning block 53 are arranged in parallel with the guide rail positioning block 52. A rectangular key 47 is arranged at the end of the fifth bearing seat 38. A locking clamp 39 is fixed to the fifth bearing seat 38. The locking clamp 39 is used for locking during the Z-direction gear-rack lifting process of the measured guide rail. The first optical axis of the guiding device 41 and the second optical axis of the guiding device 42 are arranged symmetrically at the center of the lower turntable 3. The lower ends of the first optical axis of the guiding device 41 and the second optical axis of the guiding device 42 are installed on the lower turntable 3, and the upper ends pass through the upper disc 48 provided with through holes. A center point 43 is installed on the lower surface of the upper disc 48. The center point 43 is a conical cylinder.

[0015] The locking clamp 39 is of a square structure with a circular structure in the middle. The gear shaft for controlling the lifting passes through the circular structure. Small round holes are symmetrically arranged on both sides of the circular structure for fixing the locking clamp 39 to the fifth bearing seat 38. The square structure above the circular structure is not closed and has a gap. A round hole is opened in the gap, and an M2 screw is inserted. Loosen the screw during lifting, and turn the lifting gear shaft 47 with a utility tool. Tighten the screw in the non-lifting state.

[0016] The guide rail positioning block 52 is a three-quarter circular positioning block, which is a 90° vertical plane.

[0017] The overall Z-axis movement structure includes a Z-axis column 23. The Z-axis column 23 is fixed on the workbench 4. A coupling 7 is arranged on the Z-axis column 23. The coupling 7 connects the first motor 6 to the lead screw 9. The lead screw 9 is arranged inside the Z-axis column 23 in the vertical direction. The first motor 6 is located at the top of the Z-axis column 23. Bearing seats three 25 and four 26 are respectively arranged at the upper and lower ends of the lead screw 9. The lead screw 9 and the guide slider 27 are connected through a bracket device 28. The lead screw 9 is arranged on the ball screw nut.

[0018] The overall X-axis movement structure is arranged on the bracket device 28. The bracket device 28 is fixed on the ball screw nut. The X-axis movement structure includes a ball screw 30. At both ends of the ball screw 30, a first lead screw bearing 32 and a second lead screw bearing 33 are respectively arranged. Among them, the second lead screw bearing 33 is connected to the stepping motor 31. On both sides of the stepping motor 31, a first guide rail 34 and a second guide rail 35 are symmetrically arranged. The first guide rail 34, the second guide rail 35 and the ball screw 30 are arranged in parallel. The ball screw 30 is connected to the second bracket 36 through a ball screw nut. A laser sensor 37 is arranged on the second bracket 36.

[0019] The beneficial effects of the present utility model:

[0020] Through the linear reciprocating motion of the X-axis and Z-axis of the probe movement mechanism of the present utility model, the error measurement of each geometric surface of the crossed roller guide rail is realized by the rotary table mechanism of the measured guide rail. The measured guide rail clamping mechanism is selected to use a rotary center to ensure the rotary accuracy.

[0021] The positioning block of this application is a three-quarter circular positioning block, which is a 90° vertical plane. When one guide rail is detected, the guide rail is removed. Then, the reference plane of the next guide rail to be detected is placed against the 90° vertical plane of the positioning block and clamped. It is simple and reliable, very time-saving, and has high clamping accuracy. Description of the Drawings

[0022] Figure 1 It is a schematic diagram of the overall structure of the present utility model.

[0023] Figure 2 It is a schematic diagram of the structure of the rotary table of the present utility model.

[0024] Figure 3 It is a schematic diagram of the structure of the clamping device for the measured guide rail.

[0025] Figure 4 It is a schematic diagram of the structure of the lead screw 9 of the probe Z-axis movement.

[0026] Figure 5 It is a schematic diagram of the structure of the auxiliary guide rail 8 of the probe Z-axis movement.

[0027] Figure 6 It is a schematic diagram of the structure of the probe X movement axis.

[0028] Figure 7 It is a schematic diagram of the locking clamp block 39.

[0029] Figure 8 It is a schematic diagram of the support device 28.

[0030] Figure 9 It is a schematic diagram of the positioning block 52 of the measured guide rail.

[0031] Reference numerals:

[0032] 1. Measured guide rail; 2. Thimble, 3. Lower turntable; 4. Working platform; 5. Limit block; 6. Motor, 8. Auxiliary guide rail, 9. Ball screw, 11. Turntable housing, 12. Motor, 13. Pinion, 14. Gear, 15. Worm shaft, 17. Turbine, 18. Bearing seat, 19. Bearing seat, 20. Turntable, 21. Motor bracket, 22. Protective cover, 23. Z-axis column, 24. Bracket, 25. Bearing seat, 26. Bearing seat, 27. Guide slider, 28. X-axis working platform, 30. Ball screw, 31. Stepper motor, 32. Screw bearing, 33. Screw bearing, 34. Guide rail, 35. Guide rail, 36. Bracket, 37. Laser sensor, 38. Bearing seat, 39. Locking clamp block, 40. Optical axis, 41. Optical axis, 43. Center point, 45. Outer shell, 46. Lifting rack, 48. Upper disc, 50. Gear shaft, 51. Coupling. Specific embodiments

[0033] The present invention will be further described in detail below with reference to the accompanying drawings.

[0034] Refer to Figure 1 , A cross-roller guideway profile geometric parameter measuring instrument, including a measured guide rail clamping mechanism, a turntable mechanism, and probe Z and X movement axis mechanisms.

[0035] As Figure 2 shown, the turntable mechanism is composed of the motor two 12, the housing 11, the pinion 13, the gear 14, the worm shaft 15, the turbine 17, the bearing seat one 18, the bearing seat two 19, the turntable 20, the turntable 3, the motor bracket one 21, and the protective cover 22.

[0036] The turntable mechanism is integrally arranged on the housing 11, and the housing 11 is fixed on the working platform 4. The turntable mechanism includes the second motor 12. The second motor 12 drives the pinion 13 to mesh with the large gear 14. The large gear 14 is installed on the worm shaft 15. The worm shaft 15 meshes with the turbine 17. The two ends of the worm shaft 15 are respectively installed with the first bearing block 18 and the second bearing block 19. The turbine 17 is connected to the lower turntable 3 through the turntable 20. The second motor 12 is installed on the protective cover 22 through the first bracket 21.

[0037] The second motor 12 drives the pinion 13. Here, since the pinion 13 and the motor shaft do not need to transmit a large torque, a set screw drive is selected. The pinion 13 meshes with the large gear 14. The first bearing block 18 and the second bearing block 19 are installed at both ends of the worm shaft 15. The worm shaft 15 is positioned by the shaft shoulder. The turbine 17 is connected to the turntable 20. The large gear 14 and the worm 15 are connected by a key drive.

[0038] As Figure 3 shown, the measured guide rail clamping mechanism is composed of a gear 50, a lifting rack 46, a fifth bearing block 38, a housing 45, a lower turntable 3, a locking clamp 39, a smooth shaft 41, a smooth shaft 42, a tip 43, and an upper disc 48.

[0039] For the lifting rack 46, there are guide rails designed inside the housing 45. The lifting rack 46 is connected to the guide rails inside the housing 45 through the rear guide rails. The housing 45 is installed on the lower turntable 3. The lower turntable 3 is connected to the upper end of the stepped cylindrical turntable 20 by bolts. The guide rail positioning blocks 52 and 53 are respectively arranged in parallel on the axes of the upper disc 48 and the lower turntable 3 through brackets. The gear shaft 50 is installed on the fifth bearing block 38, and there is a rectangular key 47 at the end. The designed locking clamp 39 is fixed on the fifth bearing block 38. The first smooth shaft for guiding device 41 and the second smooth shaft for guiding device 42 are symmetrically arranged at the center of the lower turntable 3. The upper disc 48 for installing the tip 43 is designed with through holes for the smooth shafts 41 and 42 to pass through. The specific shape structure of the tip 43 is a conical cylinder.

[0040] The measured guide rail clamping mechanism is realized by the transmission of the gear shaft 50 and the rack 46. The gear shaft 50 is installed on the fifth bearing block 38, and there is a rectangular key at its end. Tools are used to rotate the gear to achieve lifting. There are two smooth shafts 41 and 42 on the lower turntable 3 for guiding to ensure the stability of the elevator. The gear shaft 50 and the rack 46 only play a transmission role. The housing 45 with internal designed guide rails helps the turntable 3 to rise smoothly. Here, the housing 45 is connected and fixed to the lower turntable through threaded holes. A locking clamp 39 is designed to address the problem that the gear rack transmission cannot self-lock. The structure of the locking clamp 39 is simple. The two through holes at the bottom are connected to the fifth bearing block 38, and an M2 screw is inserted into the side threaded hole to achieve the tightening and loosening actions.

[0041] The probe Z-axis movement mechanism consists of a Z-axis column 23, a first stepping motor 6, a coupling 51, a lead screw 9, a bracket 24, a third bearing block 25, a fourth bearing block 26, a guiding slider 27, and an X-axis working platform 28.

[0042] As Figure 4 , Figure 5 shown in the structure of the probe Z-axis movement, the Z-axis column 23 is fixed on the working platform 4. The coupling 7 connects the first motor 6 and the lead screw 9. The lead screw 9 is arranged with a lead screw nut fixed on it. The ball screw 9 is fixed on the third and fourth bearing blocks 25 and 26 at both ends. The Z-axis lead screw 9 and the guiding slider 27 are connected through a bracket device 28.

[0043] The coupling 51 connects the first motor 6 and the lead screw 9, and controls the rise and fall of the control platform through the bracket 24. The ball screw 9 is fixed on the third bearing block 25 and the fourth bearing block 26 at both ends. The Z-axis lead screw 9 and the guiding slider 27 are connected through a bracket device 28.

[0044] The probe X-axis movement mechanism consists of a ball screw 30, a first lead screw bearing 32, a second lead screw bearing 33, a stepping motor 31, a first guide rail 34, a second guide rail 35, a second bracket 36, and a laser sensor 37. The rotation of the lead screw 30 driven by the stepping motor 31 controls the movement of the laser sensor 37 on the X-axis. To improve the movement accuracy, the first guide rail 34 and the second guide rail 35 are symmetrically arranged on both sides of the lead screw 30.

[0045] As Figure 6 shown in the structure of the probe X-axis movement, the device 28 is fixed on the ball screw nut. The first lead screw bearing 32 and the second lead screw bearing 33 are arranged at both ends of the ball screw 30. The first guide rail 34 and 35 are symmetrically arranged on both sides of the stepping motor 31. The lead screw 30 is connected to the second bracket 36 through a ball screw nut. The laser sensor 37 is arranged on the second bracket 36.

[0046] As Figure 7 shown: the locking clamp block 39. The principle of the locking clamp block 39 is very simple. The two through holes below are connected to the bearing block. A screw M2 is inserted into the threaded hole on the side. When lifting, loosen the screw and rotate the lifting pinion. In the non-lifting state, just tighten the screw to complete the locking action, which is simple and efficient, solving the problem of manual holding. The material is selected as 45 steel.

[0047] As Figure 8Shown: The bracket device 28, which is also a part for installing the X-axis drive mechanism. The material is selected as Q235. Since this part is a key connecting piece and an installation platform, relatively high precision requirements are imposed on it, and it is required to ensure a precision level of 7. Similarly, during installation, the installation precision needs to be ensured to avoid, as much as possible, problems with insufficient detection precision caused by installation issues. Its auxiliary guiding mechanism and the base of the Z-axis ball screw drive device are both installed on the working platform 4, and rib plates are also designed to improve the rigidity of the column and prevent deformation of the entire part during transmission, which may affect detection.

[0048] The four holes on both sides of the bracket device 28 are symmetrically arranged and are connected to the lead screw nut 24 and the guiding slider 27 of the auxiliary guide rail to realize the Z-axis movement of the sensor. The four holes arranged on the upper surface are symmetrically arranged and are respectively connected to a limit block individually to limit the extreme displacement of the sensor in the X direction. The four holes in the groove respectively fix two bearing seats to fix the lead screw guide rail.

[0049] As Figure 9 Shown: A three-quarter circle positioning block, which is designed as an ideal 90° vertical plane. This part is also used in pairs. One is installed on the lower half of the turntable, and the other is installed on the upper liftable mechanism. When the guide rail 1 is detected, after removing the guide rail, the reference surface of the next guide rail to be detected is aligned with the 90° vertical planes of the positioning blocks 52 and 53 and then clamped. It is simple and reliable, very time-saving, and has high clamping precision. This clamping and positioning device is arranged at the upper and lower top parts of the guide rail 1 to be measured, only blocking a very small area of the guide rail 1 to be measured and not affecting the detection of the guide rail. The exposed part is fully sufficient for the detection requirements of the crossed roller guide rail.

[0050] The working principle of the present utility model:

[0051] During measurement, the guide rail 1 to be measured is installed on the rotary table mechanism. The measured part rotates together with the rotary table mechanism. The motor 1 drives the platform 28 fixed on the lead screw nut 24 through the ball screw 9 to realize the Z-axis movement of the probe. The motor 31 drives the probe through the ball screw 30 to realize the X-axis movement of the probe. The measurement data of each profile of the guide rail are timely fed back to the computer through the grating, and finally the data obtained from the measurement are processed to finally obtain the error of the geometric profile of the crossed roller guide rail, completing the detection.

[0052] In summary, the geometric parameter measuring instrument for the profile of the crossed roller guide rail of the present utility model has the advantages of high precision, multi-function, automation, non-contact measurement, etc., and has important significance in industrial production, especially in precision machinery and automation equipment.

Claims

1. A measuring instrument for geometric parameters of the profile of a crossed roller guide, characterized in that It includes a rotary table mechanism, a measured guide rail, a measured guide rail clamping mechanism, a Z-axis movement structure, and an X-axis movement structure; The rotary table mechanism is used to drive the measured guide rail to rotate; The measured guide rail clamping mechanism is used to clamp the measured guide rail on the rotary table mechanism; The Z-axis movement structure is used to realize the lifting action of the overall measuring device, that is, the reciprocating movement of the Z-axis; The X-axis movement structure is used to adjust the laser displacement sensor to a suitable position, that is, the reciprocating movement of the X-axis; The measured guide rail clamping mechanism is fixed on the rotary table mechanism, the rotary table mechanism is fixed on the working platform (4) through the housing, the X-axis movement structure is connected to the Z-axis through the support device (28), the Z-axis is fixed on the working platform (4) through the housing, and the rotary table mechanism cooperates with the Z-axis and the X-axis to realize the geometric measurement of the guide rail.

2. The profile geometric parameter measuring instrument for a crossed roller guide according to claim 1, wherein The rotary table mechanism includes a second motor (12), a first small gear (13) is arranged on the output shaft of the second motor (12), the first small gear (13) meshes with a large gear (14), the large gear (14) is installed on a worm shaft (15), a worm gear (17) is meshed at the middle position of the worm shaft (15), bearing seats one (18) and two (19) are respectively installed at both ends of the worm shaft (15), and the worm gear (17) is connected to the lower turntable (3) through a turntable (20).

3. The profile geometric parameter measuring instrument for a crossed roller guide according to claim 2, characterized in that, The whole rotary table mechanism is arranged on the housing (11), the housing (11) is fixed on the working platform (4), the second motor (12) is installed on the protective cover (22) through a first support (21), and the turntable (20) is a stepped cylinder.

4. A cross-roller guide surface geometric parameter measuring instrument according to claim 3, characterized in that, The whole measured guide rail clamping mechanism is arranged on the lower turntable (3), the measured guide rail clamping mechanism includes a lifting rack (46), the lifting rack (46) is connected to the inner guide rail of the housing (45) through the guide rail at the rear side, the housing (45) is fixed on the lower turntable (3), the housing (45) is installed on the lower turntable (3), the lower turntable (3) is connected to the upper end of the stepped cylindrical turntable (20) by bolts, a fifth bearing seat (38) is installed at the connection position of the housing (45) and the lower turntable (3), a guide rail positioning block (52), a positioning block (53), and a lifting rack (46) are arranged on the fifth bearing seat (38), the guide rail positioning block (52) is installed at the upper end, the upper disc (48) and the positioning block (53) are arranged in parallel with the guide rail positioning block (52), the end of the fifth bearing seat (38) is a rectangular key (47), a locking clamp block (39) is fixed on the fifth bearing seat (38), the locking clamp block (39) is used for locking during the Z-direction gear-rack lifting process of the measured guide rail, a first guide device optical axis (41) and a second guide device optical axis (42) are symmetrically arranged at the center of the lower turntable (3), the lower ends of the first guide device optical axis (41) and the second guide device optical axis (42) are installed on the lower turntable (3), and the upper ends pass through the upper disc (48) provided with through holes, and a center point (43) is installed on the lower surface of the upper disc (48), and the center point (43) is a conical cylinder.

5. A geometric parameter measuring instrument for the profile of a crossed roller guide according to claim 4, characterized in that The locking clamp block (39) has a square structure with a circular structure in the middle. The gear shaft for controlling the lifting passes through the circular mechanism, and small round holes are symmetrically arranged on both sides of the circular structure for fixing the locking clamp block (39) to the fifth bearing block (38). There is a gap in the square structure above the circular structure, and a round hole is opened in the gap for inserting an M2 screw.

6. The profile geometric parameter measuring instrument for a crossed roller guide according to claim 4, characterized in that, The guide rail positioning block (52) is a three-quarter circular positioning block with a 90° vertical plane.

7. A geometric parameter measuring instrument for the profile of a crossed roller guide according to claim 4, characterized in that, The overall Z-axis movement structure includes a Z-axis column (23). The Z-axis column (23) is fixed on the working platform (4). A coupling (7) is arranged on the Z-axis column (23). The coupling (7) connects the first motor (6) to the lead screw (9). The lead screw (9) is arranged inside the Z-axis column 23 in the vertical direction. The first motor (6) is located at the top of the Z-axis column (23). The upper and lower ends of the lead screw (9) are respectively provided with a third bearing block (25) and a fourth bearing block (26). The lead screw (9) and the guide slider (27) are connected through a bracket device (28). The lead screw (9) is arranged on the ball screw nut.

8. A measuring instrument for geometric parameters of the surface of a crossed roller guide according to claim 7, characterized in that, The overall X-axis movement structure is arranged on the bracket device (28). The bracket device (28) is fixed on the ball screw nut. The X-axis movement structure includes a ball screw (30). A first lead screw bearing (32) and a second lead screw bearing (33) are respectively arranged at both ends of the ball screw (30). Among them, the second lead screw bearing (33) is connected to the stepping motor (31). Guide rails one (34) and two (35) are symmetrically arranged on both sides of the stepping motor (31). The guide rails one (34) and two (35) are parallel to the ball screw (30). The ball screw (30) is connected to the second bracket (36) through a ball screw nut. The laser sensor (37) is arranged on the second bracket (36).

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