A plane reflector device for calibrating a multi-tooth indexing table

Abstract

The present invention relates to the technical field of metrological calibration instruments, and proposes a plane reflector device for calibrating a multi-tooth dividing table, comprising a base, a central shaft, an annular bearing, a shell, a plane mirror, a coarse adjustment mechanism, a fine adjustment mechanism and a locking mechanism, wherein the central shaft is fixed on the base; the annular bearing is sleeved on the central shaft; the shell is sleeved on the annular bearing; the plane mirror is embedded in the circumferential surface of the shell; the coarse adjustment mechanism is fixed on the base, and the coarse adjustment mechanism can drive the shell to rotate by relying on the annular bearing; the fine adjustment mechanism is fixed on the shell, and the fine adjustment mechanism is selectively fixedly connected to the coarse adjustment mechanism and can drive the shell to rotate; the locking mechanism is arranged on the central shaft; the arrangement of the above structure enables the plane mirror to be coarsely and finely adjusted through the coarse adjustment mechanism and the fine adjustment mechanism, and after the adjustment is completed, the shell and the plane mirror can be positioned by the locking mechanism to prevent the plane mirror from rebounding and deflecting, which can effectively improve the calibration accuracy and has the advantages of a simple and compact overall structure.

Description

Technical Field

[0001] The present invention relates to the technical field of measuring instrument calibration, in particular to a plane reflector device for calibrating a multi-tooth indexing table. Background Art

[0002] A multi-tooth dividing table is an angular measurement standard that provides high-precision division values. It is also a circular dividing device used for precision machining. When calibrating the maximum division interval error of a multi-tooth dividing table, the multi-faceted prism and the dividing table being tested can be used for calibration by arrangement and comparison. In addition, the same grade of dividing tables can be used for calibration by arrangement and comparison. Both methods require an autocollimator to read the value of small angle changes. When using the same grade of dividing tables for arrangement and comparison, a plane mirror needs to be fixed on the stacked dividing tables to assist the autocollimator in reading the readings.

[0003] The invention patent with the existing authorization announcement number CN102914260B discloses a turntable indexing error detection method based on a photoelectric two-axis collimator, which includes the following steps: (1) installing a multi-tooth indexing table at the center of the working surface of the turntable to be inspected, fixing a plane reflector on the multi-tooth indexing table, and using an autocollimator to aim at the plane reflector; (2) rotating the turntable to be inspected one circle so that both axes of the two-axis photoelectric autocollimator have readings; (3) setting the turntable to be inspected to zero position, reading the initial value of the two-axis photoelectric autocollimator, and then rotating the multi-tooth indexing table and the reflector together with the turntable to be inspected by an angle of φ; (4) after rotating the reflector along with the multi-tooth indexing table in the opposite direction by an angle of -φ, the photoelectric autocollimator aims at the reflector again and reads the measurement value until a full circle is completed; (5) changing the inclination angle of the multi-tooth indexing table relative to the turntable while keeping the two-axis photoelectric autocollimator stationary, repeating steps 2 to 4 for a second detection, and reading the measurement value of the two-axis photoelectric autocollimator.

[0004] As in the above technical solution, before calibrating the dividing table, it is necessary to fix a plane mirror on the multi-tooth dividing table. However, the existing plane mirrors are generally fixed in a single way and lack adjustment freedom. They are very difficult to install and use. Manual adjustment is very prone to errors, which will affect the accuracy of the calibration. Some plane mirrors with adjustable freedom often lack stability. This is mainly because the stress or rebound force generated inside the plane mirror adjustment mechanism will cause the plane mirror to rebound for half an hour or even several hours, causing the normal line of the plane mirror to drift, affecting the calibration accuracy of the dividing table. Summary of the Invention

[0005] In view of this, the present invention proposes a plane reflector device for calibrating a multi-tooth indexing table that is easy to adjust and has a stable structure, so as to solve the problem that the existing plane mirror is unstable and easily causes deviation after adjustment.

[0006] The technical solution of the present invention is achieved as follows: The present invention provides a plane reflector device for calibrating a multi-tooth indexing table, comprising a base, a central shaft, an annular bearing, a housing, a plane mirror, a coarse adjustment mechanism, a fine adjustment mechanism and a locking mechanism, wherein:

[0007] The central shaft is fixed on the base;

[0008] The annular bearing is sleeved on the central shaft, and the inner ring of the annular bearing is connected to the central shaft by interference fit;

[0009] The housing is sleeved on the annular bearing, and the housing and the outer ring of the annular bearing are connected by an interference fit, and the central axis passes through the housing from top to bottom. A circular groove is opened on the circumferential surface of the housing, and the plane mirror is embedded in the circular groove. The coarse adjustment mechanism is fixed to the base, and the coarse adjustment mechanism can drive the housing to rotate relative to the annular bearing.

[0010] The fine adjustment mechanism is fixed on the housing, and the fine adjustment mechanism is selectively fixedly connected with the coarse adjustment mechanism and can drive the housing to rotate;

[0011] The locking mechanism is arranged on the central shaft and can move up and down along the central shaft and abut against the circumferential surface of the central shaft and the inner wall of the shell to relatively fix the central shaft and the shell.

[0012] On the basis of the above technical solution, preferably, the coarse adjustment mechanism includes a bevel gear, a bevel gear and a coarse adjustment rod, wherein:

[0013] The bevel gear is fixed on the base, and the central axis passes through the middle of the bevel gear, and the central axis and the bevel gear are concentrically arranged; a gear groove is provided in the shell, the bevel gear is located in the gear groove, and the bevel gear is meshed with the bevel gear; the coarse adjustment rod is inserted into the shell from outside the shell, and the coarse adjustment rod is fixed in series with the bevel gear.

[0014] On the basis of the above technical solution, preferably, the base, the central shaft and the bevel gear disc are integrally formed by milling.

[0015] On the basis of the above technical solution, preferably, the fine adjustment mechanism includes a bracket, a ring sleeve, a threaded sleeve, a screw, a fine adjustment rod and a reset member, wherein,

[0016] A through hole is opened on the shell, which is connected to the gear groove. A bracket is set on the left and right sides of the through hole, and the bracket is fixedly connected to the top surface of the shell;

[0017] The ring sleeve is mounted on the coarse adjustment rod, and the ring sleeve and the coarse adjustment rod are in clearance fit;

[0018] The threaded sleeve is fixed on the ring sleeve, and the threaded sleeve is vertically arranged and extends to the outside of the shell through the through hole;

[0019] The screw is connected to the threaded sleeve by threads, and the screw can selectively pass through the threaded sleeve and the ring to support the coarse adjustment rod;

[0020] The fine-adjustment rod passes through the bracket on the right side of the through hole and is supported on the threaded sleeve. The fine-adjustment rod and the bracket are connected by threads; the reset member is installed on the bracket on the left side of the through hole, and the reset member continuously applies force to the threaded sleeve to move to the right.

[0021] On the basis of the above technical solution, preferably, the reset member includes a push rod, an end plate and a tension spring, wherein:

[0022] The ejector rod passes through the bracket on the left side of the through hole, and the ejector rod is slidably connected to the bracket on the left side of the through hole;

[0023] The end plate is fixed on the end of the push rod away from the threaded sleeve;

[0024] The tension spring is sleeved on the push rod, one end of the tension spring is fixedly connected to the end plate, and the other end is fixedly connected to the bracket on the left side of the through hole.

[0025] On the basis of the above technical solution, preferably, the locking mechanism includes a threaded knob, a plane bearing, a locking sleeve and a spring, wherein:

[0026] The threaded knob is connected to the upper end of the central shaft through a thread;

[0027] The plane bearing is sleeved on the central shaft, and the plane bearing is located on the lower side of the threaded knob;

[0028] The locking sleeve is sleeved on the central shaft and is located on the lower side of the plane bearing. A first inclined surface is provided on the inner wall of the locking sleeve, a second inclined surface is provided on the outer wall of the locking sleeve, a third inclined surface corresponding to the first inclined surface is provided on the circumferential surface of the central shaft, and a fourth inclined surface corresponding to the second inclined surface is provided on the inner wall of the housing.

[0029] A step surface is provided on the central shaft, the spring is sleeved on the central shaft, the upper end of the spring abuts against the locking sleeve, and the bottom end of the spring abuts against the step surface.

[0030] On the basis of the above technical solution, preferably, a plurality of balls are provided on the inner wall of the locking sleeve, and the positions of the balls and the locking sleeve are relatively fixed and can rotate freely.

[0031] On the basis of the above technical solution, preferably, it further comprises a magnetically adjustable scale ring, and the magnetically adjustable scale ring is fixed on the base.

[0032] On the basis of the above technical solution, preferably, it further comprises a fixing mechanism, wherein the fixing mechanism comprises a connecting block, a quick-locking rod and an elastic block.

[0033] The bottom of the base is provided with an annular bottom plate, the connecting block is a stepped pressing block, the notch of the connecting block is supported on the annular bottom plate, and a longitudinal hole is provided on the connecting block;

[0034] The quick-locking rod passes through the longitudinal hole, and the diameter of the longitudinal hole is larger than the diameter of the rod portion of the quick-locking rod;

[0035] The elastic block is located between the connecting block and the handle of the quick-locking rod, and the quick-locking rod passes through the elastic block.

[0036] More preferably, a rubber pad is clamped between the connecting block and the annular bottom plate.

[0037] The plane reflector device for calibrating a multi-tooth indexing table of the present invention has the following beneficial effects compared with the prior art:

[0038] (1) The plane mirror is mounted on the housing, and the central axis of the housing and the base are connected through an annular bearing, and a coarse adjustment mechanism and a fine adjustment mechanism are provided to drive the housing to rotate along the central axis, and a locking mechanism is provided to position the central axis and the housing so that the positions of the housing and the central axis are relatively fixed. In this way, the housing can be prevented from rotating due to the stress or rebound force generated by the coarse adjustment mechanism and the fine adjustment mechanism, thereby affecting the position of the plane mirror, thereby avoiding the normal deviation of the plane mirror. The structure is stable and can effectively improve the calibration accuracy. (2) The fine adjustment mechanism is composed of a bracket, a ring sleeve, a threaded sleeve, a screw, a fine adjustment rod and a reset member, and the fine adjustment mechanism is connected to the coarse adjustment mechanism, and the housing and the plane mirror are driven to rotate and adjust through the coarse adjustment mechanism. In this way, there is no need to set up two sets of transmission systems for driving the housing to rotate. The operation switching of the fine adjustment mechanism and the coarse adjustment mechanism can be realized through the screw. It has the advantages of convenient adjustment and compact structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 A perspective view of a plane reflector device for calibrating a multi-tooth indexing table according to the present invention;

[0041] Figure 2 A longitudinal cross-sectional view of a plane reflector device for calibrating a multi-tooth indexing table according to the present invention;

[0042] Figure 3 An exploded view of the plane reflector device for calibrating a multi-tooth indexing table according to the present invention;

[0043] Figure 4 This is a structural diagram of the connection between the fine adjustment mechanism and the coarse adjustment mechanism of the plane reflector device for calibrating a multi-tooth indexing table according to the present invention;

[0044] Figure 5 This is a structural diagram of the base and central axis of the plane reflector device for calibrating a multi-tooth indexing table of the present invention;

[0045] Figure 6 A longitudinal cross-sectional view of the housing of the plane reflector device for calibrating a multi-tooth indexing table according to the present invention;

[0046] Figure 7 A longitudinal cross-sectional view of a locking sleeve of a plane reflector device for calibrating a multi-tooth indexing table according to the present invention;

[0047] Figure 8 This is a structural diagram of the fixing mechanism installation of the plane reflector device for calibrating a multi-tooth indexing table according to the present invention;

[0048] Figure 9 This is a structural diagram of the fixing mechanism of the plane reflector device for calibrating a multi-tooth indexing table of the present invention. DETAILED DESCRIPTION

[0049] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0050] like Figures 1 to 9 As shown, the plane reflector device for calibrating a multi-tooth dividing table of the present invention includes a base 1, a central shaft 2, an annular bearing 3, a housing 4, a plane mirror 5, a coarse adjustment mechanism 6, a fine adjustment mechanism 7, a locking mechanism 8, a magnetically adjustable scale ring 9 and a fixing mechanism 10.

[0051] Among them, the central shaft 2 is fixed on the base 1; the annular bearing 3 is sleeved on the central shaft 2, and the inner ring of the annular bearing 3 is connected with the central shaft 2 by interference fit; the shell 4 is sleeved on the annular bearing 3, and the shell 4 is connected with the outer ring of the annular bearing 3 by interference fit, and the central shaft 2 passes through the shell 4 up and down; a circular groove 401 is opened on the circumferential surface of the shell 4, and the plane mirror 5 is embedded in the circular groove 401; the coarse adjustment mechanism 6 is fixed on the base 1, and the coarse adjustment mechanism 6 can drive the shell 4 to rotate relying on the annular bearing 3; the fine adjustment mechanism 7 is fixed on the shell 4, and the fine adjustment mechanism 7 is selectively fixedly connected with the coarse adjustment mechanism 6 and can drive the shell 4 to rotate; the locking mechanism 8 is provided on the central shaft 2, and the locking mechanism 8 can move up and down along the central shaft 2, and abut against the circumferential surface of the central shaft 2 and the inner wall of the shell 4 to relatively fix the central shaft 2 and the shell 4;

[0052] As in the above structure, the coarse adjustment mechanism 6 can drive the housing 4 and the plane mirror 5 to rotate around the central axis 2 by relying on the annular bearing 3, and the fine adjustment mechanism 7 can drive the housing 4 and the plane mirror 5 to rotate through the coarse adjustment mechanism 6. They are selectively fixedly connected and driven. When the fine adjustment mechanism 7 is fixedly connected to the coarse adjustment mechanism 6, the fine adjustment mechanism 7 can drive the housing 4 and the plane mirror 5 to rotate. When the fine adjustment mechanism 7 is disconnected from the coarse adjustment mechanism 6, only the coarse adjustment mechanism 6 can drive the housing 4 and the plane mirror 5 to rotate. They form a set of associated transmission systems, and there is no need to provide a separate transmission system for driving the fine adjustment mechanism 7, thereby improving the compactness of the device structure.

[0053] Since the adjustment mechanism may cause the shell 4 to rotate due to stress or rebound force, causing the plane mirror 5 to deviate, a locking mechanism 8 is provided for positioning, which can fix the position of the shell 4 and the central axis 2 relatively to avoid the shell 4 rotating due to the stress or rebound force of the adjustment mechanism, causing the plane mirror 5 to deviate, thereby ensuring the calibration accuracy; this device mainly realizes horizontal rotation adjustment, because the multi-tooth dividing table will be leveled and adjusted before the calibration work begins, so there is no need to set a pitch attitude adjustment mechanism, thereby reducing the impact of rebound drift caused by the adjustment.

[0054] In this embodiment, as a preferred method, Figure 2 and Figure 3 As shown, the coarse adjustment mechanism 6 includes a bevel gear 601, a bevel gear 602 and a coarse adjustment rod 603, wherein the bevel gear 601 is fixed to the base 1, the central shaft 2 passes through the middle of the bevel gear 601, and the central shaft 2 is concentrically arranged with the bevel gear 601; a gear groove 402 is provided in the housing 4, the bevel gear 602 is located in the gear groove 402, and the bevel gear 602 is meshed with the bevel gear 601; the coarse adjustment rod 603 is inserted into the housing 4 from the outside, and the coarse adjustment rod 603 is fixed in series with the bevel gear 602;

[0055] In this way, when the coarse adjustment rod 603 is rotated, the bevel gear 602 rotates synchronously. While the bevel gear 602 rotates along the bevel gear plate 601, it drives the housing 4 and the plane mirror 5 to rotate together, thereby adjusting the position of the plane mirror 5. Due to the use of bevel gear transmission, it has high transmission accuracy and a compact structure.

[0056] In this embodiment, as a preferred method, the base 1, the center shaft 2 and the bevel gear disk 601 are integrally formed by milling; since the calibration accuracy requirements of the multi-tooth dividing table are relatively high, the base 1, the center shaft 2 and the bevel gear disk 601 can be integrally milled and manufactured using a machining center, thereby improving the overall accuracy, thereby improving the adjustment accuracy of the plane mirror 5 and reducing the calibration error.

[0057] In this embodiment, as a preferred method, Figure 2 、 Figure 3 and Figure 4 As shown, the fine adjustment mechanism 7 includes a bracket 701, a ring sleeve 702, a threaded sleeve 703, a screw 704, a fine adjustment rod 705 and a reset member 706, wherein a through hole 403 is opened on the housing 4, the through hole 403 is connected to the gear groove 402, and a bracket 701 is provided on the left and right sides of the through hole 403. The bracket 701 is fixedly connected to the top surface of the housing 4; the ring sleeve 702 is sleeved on the coarse adjustment rod 603, and the ring sleeve 702 and the coarse adjustment rod 603 are clearance-matched; the threaded sleeve 703 is fixed on the ring sleeve 702, and the threaded sleeve The cylinder 703 is vertically arranged and extends to the outside of the housing 4 through the through hole 403; the screw 704 is threadedly connected to the threaded sleeve 703, and the screw 704 can selectively pass through the threaded sleeve 703 and the ring 702 to abut the coarse adjustment rod 603; the fine adjustment rod 705 passes through the bracket 701 on the right side of the through hole 403 and abuts against the threaded sleeve 703, and the fine adjustment rod 705 is threadedly connected to the bracket 701; the reset member 706 is installed on the bracket 701 on the left side of the through hole 403, and the reset member 706 continuously applies force to the threaded sleeve 703 to move it to the right;

[0058] In this way, after the screw rod 704 is tightened down and pressed against the coarse adjustment rod 603, the coarse adjustment rod 603 becomes ineffective, and the positions of the coarse adjustment rod 603, the ring sleeve 702 and the threaded sleeve 703 are relatively fixed. Then the fine adjustment rod 705 is rotated to drive the threaded sleeve 703 to move to the left through the fine adjustment rod 705. At the same time, the reset member 706 gives the threaded sleeve 703 a rightward force. By rotating the fine adjustment rod 705 forward and backward in conjunction with the reset member 706, the threaded sleeve 703 can be shaken left and right. 03 moves, since the screw rod 704 and the coarse adjustment rod 603 are locked and their positions are relatively fixed, the threaded sleeve 703 will drive the coarse adjustment rod 603 to rotate slightly through the ring sleeve 702, thereby driving the bevel gear 602 to roll along the bevel gear plate 601 to achieve precise rotational adjustment of the shell 4 and the plane mirror 5; the fine adjustment mechanism 7 drives the shell 4 and the plane mirror 5 to rotate and adjust through the coarse adjustment mechanism 6, and no additional transmission system is required, so its overall structure is compact, which is conducive to reducing the volume of the device.

[0059] In this embodiment, as a preferred method, Figure 1 and Figure 4As shown, the reset member 706 includes a push rod 7061, an end plate 7062 and a tension spring 7063, wherein the push rod 7061 passes through the bracket 701 on the left side of the through hole 403 and is slidably connected to the bracket 701 on the left side of the through hole 403; the end plate 7062 is fixed to the end of the push rod 7061 away from the threaded sleeve 703; the tension spring 7063 is sleeved on the push rod 7061, one end of the tension spring 7063 is fixedly connected to the end plate 7062, and the other end is fixedly connected to the bracket 701 on the left side of the through hole 403;

[0060] As shown in the above structure, the tension spring 7063 will drive the push rod 7061 to move to the right through the end plate 7062, thereby supporting the threaded sleeve 703, so that the threaded sleeve 703 can be swung left and right by simply rotating the fine-tuning rod 705, thereby driving the coarse-tuning rod 603 to rotate forward and reverse for fine-tuning. Of course, the reset member 706 can also be set to the same structure as the fine-tuning rod 705, that is, threaded fine-tuning rods 705 are provided on the left side of the through hole 403 and the right side bracket 701, and fine-tuning is achieved by rotating the two fine-tuning rods 705.

[0061] In this embodiment, as a preferred method, Figure 2 、 Figure 3 、 Figure 5 、 Figure 6 and Figure 7 As shown, the locking mechanism 8 includes a threaded knob 801, a plane bearing 802, a locking sleeve 803 and a spring 804, wherein the threaded knob 801 is connected to the upper end of the central shaft 2 through a thread; the plane bearing 802 is sleeved on the central shaft 2, and the plane bearing 802 is located on the lower side of the threaded knob 801; the locking sleeve 803 is sleeved on the central shaft 2, and the locking sleeve 803 is located on the lower side of the plane bearing 802, and a first inclined A second inclined surface 8031 ​​is provided on the outer wall of the locking sleeve 803, a third inclined surface 201 corresponding to the first inclined surface 8031 ​​is provided on the circumferential surface of the central shaft 2, and a fourth inclined surface 404 corresponding to the second inclined surface 8032 is provided on the inner wall of the housing 4; a step surface 202 is provided on the central shaft 2, and the spring 804 is sleeved on the central shaft 2, with the upper end of the spring 804 abutting the locking sleeve 803, and the bottom end of the spring 804 abutting the step surface 202;

[0062] When the cam 802 is in the closed position, the first and second cams 803 are in the closed position, and the second cam 803 is in the closed position, so that the cam 803 is in the closed position and the second cam 803 is in the closed position.

[0063] In this embodiment, as a preferred method, Figure 7 As shown, a plurality of balls 8033 are provided on the inner wall of the locking sleeve 803. The positions of the balls 8033 and the locking sleeve 803 are relatively fixed and can rotate freely.

[0064] Since the locking sleeve 803 needs to move up and down, a ball 8033 is provided inside it, which can prevent the locking sleeve 803 from becoming unstable in cooperation with the central shaft 2 due to long-term sliding friction, thereby avoiding the phenomenon that the locking sleeve 803 is not locked in place.

[0065] In this embodiment, as a preferred method, Figure 2 As shown, the magnetic adjustable scale ring 9 is fixed on the base 1, so that the metrology staff can set a customized zero point for the direction of the plane mirror 5, thereby improving the convenience of calibration.

[0066] In this embodiment, as a preferred method, Figure 8 and Figure 9 As shown, the fixing mechanism 10 includes a connecting block 1001, a quick-locking rod 1002 and an elastic block 1003, wherein:

[0067] The bottom of the base 1 is provided with an annular bottom plate 101. The connecting block 1001 is a stepped pressing block. The notch 10011 of the connecting block 1001 abuts against the annular bottom plate 101. A longitudinal hole 10012 is provided on the connecting block 1001.

[0068] The quick-lock rod 1002 passes through the longitudinal hole 10012 , and the diameter of the longitudinal hole 10012 is larger than the diameter of the quick-lock rod 1002 ;

[0069] The elastic block 1003 is located between the connecting block 1001 and the handle 10021 of the quick-locking rod 1002 , and the quick-locking rod 1002 passes through the elastic block 1003 ;

[0070] In this way, when the device is installed and fixed, the connecting block 1001 is first pressed onto the annular base plate 101, and the quick-locking rod 1002 passes through the longitudinal hole 10012 of the connecting block 1001 to be connected and fixed to the dividing table, and then the quick-locking rod 1002 is locked by the handle 10021. Since the diameter of the longitudinal hole 10012 is larger than the diameter of the quick-locking rod 1002, the connecting block 1001 can be tilted toward the annular base plate 101 when locked to clamp and fix the base 1, which has the advantage of easy installation.

[0071] In order to make the connecting block 1001 fully fit the annular base plate 101 for pressing, the device clamps a rubber pad 1004 between the connecting block 1001 and the annular base plate 101 to compensate for the error, so that the connecting block 1001 can fully press against the annular base plate 101 to avoid displacement between the device and the dividing table, resulting in calibration deviation.

[0072] Specific implementation steps:

[0073] When using this device, two multi-tooth indexing tables are stacked and arranged. This device is fixed to the upper indexing table by a fixing mechanism 10 to assist the autocollimator in reading. During calibration, the housing 4 is first rotated by the coarse adjustment mechanism 6 to roughly adjust the direction of the plane mirror 5. Then, the coarse adjustment mechanism 6 is driven by the fine adjustment mechanism 7 to continue adjusting and finely adjust the direction of the plane mirror 5 to align it with the autocollimator. Then, the threaded knob 801 is turned to lock the coarse adjustment mechanism 6 by the locking mechanism 8 to obtain the initial position X of the plane mirror. Then, the coarse adjustment mechanism 6 is rotated to the upper position X. There are two multi-tooth indexing tables, one indexing table rotates forward and the other indexing table rotates counterclockwise. The two indexing tables rotate at the same angle. For example, the upper indexing table drives the device to rotate forward 30°, while the lower indexing table drives the upper indexing table and the device to rotate counterclockwise 30°. At this time, the autocollimator can determine whether the position of the plane mirror 5 is consistent with the initial position X. Repeat the above action several times. If the plane mirror 5 returns to the initial position X, it means that the scales of the two indexing tables are consistent. If the plane mirror 5 deviates, it means that the scales of the two indexing tables are inconsistent.

[0074] 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 principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A plane reflector device for calibrating a multi-tooth indexing table, characterized in that: It comprises a base (1), a central shaft (2), an annular bearing (3), a housing (4), a plane mirror (5), a coarse adjustment mechanism (6), a fine adjustment mechanism (7) and a locking mechanism (8), wherein: The central shaft (2) is fixed on the base (1); The annular bearing (3) is sleeved on the central shaft (2), and the inner ring of the annular bearing (3) is connected to the central shaft (2) by interference fit; The housing (4) is sleeved on the annular bearing (3), the housing (4) is connected to the outer ring of the annular bearing (3) by interference fit, and the central axis (2) passes through the housing (4) from top to bottom; A circular groove (401) is provided on the circumferential surface of the housing (4), and the plane mirror (5) is embedded in the circular groove (401); The coarse adjustment mechanism (6) is fixed on the base (1), and the coarse adjustment mechanism (6) can drive the housing (4) to rotate by relying on the annular bearing (3); The fine adjustment mechanism (7) is fixed on the housing (4), and the fine adjustment mechanism (7) is selectively fixedly connected to the coarse adjustment mechanism (6) and can drive the housing (4) to rotate; The locking mechanism (8) is arranged on the central shaft (2), and the locking mechanism (8) can move up and down along the central shaft (2) and abut against the circumferential surface of the central shaft (2) and the inner wall of the housing (4) to relatively fix the central shaft (2) and the housing (4); The coarse adjustment mechanism (6) comprises a bevel gear (601), a bevel gear (602) and a coarse adjustment rod (603), wherein the bevel gear (601) is fixed on the base (1), the central shaft (2) passes through the middle of the bevel gear (601), and the central shaft (2) and the bevel gear (601) are arranged concentrically; a gear groove (402) is provided in the housing (4), the bevel gear (602) is located in the gear groove (402), and the bevel gear (602) is meshed with the bevel gear (601); the coarse adjustment rod (603) is inserted into the housing (4) from outside the housing (4), and the coarse adjustment rod (603) and the bevel gear (602) are connected in series and fixed; The fine adjustment mechanism (7) comprises a bracket (701), a ring sleeve (702), a threaded sleeve (703), a screw (704), a fine adjustment rod (705) and a reset member (706), wherein a through hole (403) is opened on the housing (4), the through hole (403) is connected to the gear groove (402), a bracket (701) is provided on the left and right sides of the through hole (403), and the bracket (701) is fixedly connected to the top surface of the housing (4); the ring sleeve (702) is sleeved on the coarse adjustment rod (603), and the ring sleeve (702) and the coarse adjustment rod (603) are clearance-matched; the threaded sleeve (703) is fixed on the ring sleeve (702), and the threaded sleeve (703) is vertically arranged and extends to the outside of the shell (4) through the through hole (403); the screw rod (704) is connected to the threaded sleeve (703) by threads, and the screw rod (704) can selectively pass through the threaded sleeve (703) and the ring sleeve (702) to resist the coarse adjustment rod (603); the fine adjustment rod (705) passes through the bracket (701) on the right side of the through hole (403) and resists on the threaded sleeve (703), and the fine adjustment rod (705) is connected to the bracket (701) by threads; the reset member (706) is installed on the bracket (701) on the left side of the through hole (403), and the reset member (706) continuously applies a force to the threaded sleeve (703) to move to the right.

2. The plane reflector device for calibrating a multi-tooth indexing table according to claim 1, characterized in that: The base (1), the central shaft (2) and the bevel gear disc (601) are integrally formed by milling.

3. The plane reflector device for calibrating a multi-tooth indexing table according to claim 1, characterized in that: The reset member (706) includes a top rod (7061), an end plate (7062) and a tension spring (7063), wherein: The top rod (7061) passes through the bracket (701) on the left side of the through hole (403), and the top rod (7061) is slidably connected to the bracket (701) on the left side of the through hole (403); The end plate (7062) is fixed to the end of the top rod (7061) away from the threaded sleeve (703); The tension spring (7063) is sleeved on the top rod (7061), one end of the tension spring (7063) is fixedly connected to the end plate (7062), and the other end is fixedly connected to the bracket (701) on the left side of the through hole (403).

4. The plane reflector device for calibrating a multi-tooth indexing table according to any one of claims 1 to 3, characterized in that: The locking mechanism (8) comprises a threaded knob (801), a plane bearing (802), a locking sleeve (803) and a spring (804), wherein: The threaded knob (801) is connected to the upper end of the central shaft (2) via a thread; The plane bearing (802) is sleeved on the central shaft (2), and the plane bearing (802) is located on the lower side of the threaded knob (801); The locking sleeve (803) is sleeved on the central shaft (2), and the locking sleeve (803) is located on the lower side of the plane bearing (802); a first inclined surface (8031) is provided on the inner wall of the locking sleeve (803); a second inclined surface (8032) is provided on the outer wall of the locking sleeve (803); a third inclined surface (201) corresponding to the first inclined surface (8031) is provided on the circumferential surface of the central shaft (2); and a fourth inclined surface (404) corresponding to the second inclined surface (8032) is provided on the inner wall of the housing (4); A step surface (202) is provided on the central shaft (2), and the spring (804) is sleeved on the central shaft (2), with the upper end of the spring (804) abutting against the locking sleeve (803), and the bottom end of the spring (804) abutting against the step surface (202).

5. The plane reflector device for calibrating a multi-tooth indexing table according to claim 4, characterized in that: A plurality of balls (8033) are provided on the inner wall of the locking sleeve (803), and the positions of the balls (8033) and the locking sleeve (803) are relatively fixed and can rotate freely.

6. The plane reflector device for calibrating a multi-tooth indexing table according to claim 1, characterized in that: It also includes a magnetically adjustable scale ring (9), which is fixed on the base (1).

7. The plane reflector device for calibrating a multi-tooth indexing table according to claim 1, characterized in that: It also includes a fixing mechanism (10), which includes a connecting block (1001), a quick-locking rod (1002) and an elastic block (1003), wherein: An annular bottom plate (101) is provided at the bottom of the base (1); the connecting block (1001) is a stepped pressing block; a notch (10011) of the connecting block (1001) abuts against the annular bottom plate (101); and a longitudinal hole (10012) is provided on the connecting block (1001); The quick-lock rod (1002) passes through the longitudinal hole (10012), and the diameter of the longitudinal hole (10012) is larger than the diameter of the rod portion of the quick-lock rod (1002); The elastic block (1003) is located between the connecting block (1001) and the handle (10021) of the quick-locking rod (1002), and the quick-locking rod (1002) passes through the elastic block (1003).

8. The plane reflector device for calibrating a multi-tooth indexing table according to claim 7, characterized in that: A rubber pad (1004) is clamped between the connecting block (1001) and the annular bottom plate (101).

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