An optical micrometer device for calibrating a level

Abstract

The present invention discloses an optical micrometer device for calibrating a level, comprising a mounting tube, a rotating wedge mirror, a fine-motion wedge mirror, parallel glass plates, a gear set consisting of a large gear and a small gear, and related fine-motion and adjustment mechanisms, as well as a reading mechanism. The level's angle i calibration function is achieved by converting the deflection of the optical axis into the rotation of the fine-motion wedge mirror through the rotating wedge mirror and the rotating wedge mirror mount. The parallel glass plates are driven to oscillate about the oscillation axis by the large and small gears, and the translation of the optical axis caused by the parallel glass plates is converted into the rotation of the differential reading tube to achieve the micrometering function. The present invention uses the fine-motion wedge mirror to fine-tune the optical axis and maintain it in a horizontal state. The overall structure of the present invention is compact and easy to carry, and the readings are highly accurate. In conjunction with a collimator, it can meet the needs of indoor and on-site calibration of various levels.

Description

Technical Field

[0001] The present invention relates to the technical field of surveying and mapping instrument calibration, in particular to an optical micrometer device for calibrating a level. Background Art

[0002] Levels are commonly used surveying instruments, primarily helping surveyors complete terrain and elevation mapping in the field, establish horizontal baselines at construction sites, and assist in the positioning and installation of major equipment. Accuracy indicators such as the level angle and micrometer are directly related to the accuracy of the leveling baseline and, consequently, the accuracy of surveying and mapping data. National metrological verification regulations require regular calibration of levels, or immediate verification and review based on usage.

[0003] The traditional level calibration device is large in size, has low calibration accuracy, is inconvenient to carry, and has low calibration efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide an optical micrometer device for calibrating levels, which has high reading accuracy, can well meet the calibration requirements of levels of various grades, has a compact structure, and is easy to carry.

[0005] The object of the present invention is achieved like this:

[0006] An optical micrometer device for calibrating a level comprises a horizontally placed, tubular mounting tube, characterized in that: the outer wall of the right end of an annular rotating wedge-shaped mirror seat is embedded from left to right into the inner wall of the left end of the mounting tube; an annular groove is provided on the outer wall of the right end of the rotating wedge-shaped mirror seat; two shaft pin screw holes are provided on the outer wall of the left end of the mounting tube, corresponding to the position of the rotating wedge-shaped mirror seat, and penetrate the side wall of the mounting tube; two limiting shaft pins are screwed into the shaft pin screw holes from the outside to the inside and mounted on the mounting tube; the ends of the limiting shaft pins are inserted into the annular groove on the outer wall of the right end of the rotating wedge-shaped mirror seat; a rotating wedge mirror is mounted in the rotating wedge-shaped mirror seat and fixed by a rotating wedge mirror pressing ring; an annular scale is provided on the left end surface of the rotating wedge-shaped mirror seat, and an i-angle indicator line is provided on the upper portion of the left end of the mounting tube;

[0007] An annular fine-tuning wedge-shaped mirror seat is mounted on the inner wall of the right end of the mounting tube. A fine-tuning wedge mirror is mounted in the fine-tuning wedge-shaped mirror seat and secured by a fine-tuning wedge-shaped mirror pressing ring. A plurality of fine-tuning holes are evenly arranged on the side of the fine-tuning wedge-shaped mirror seat. A positioning ring is screwed into the right end of the mounting tube via a thread, and the left end face of the positioning ring is aligned with the right end face of the fine-tuning wedge-shaped mirror seat.

[0008] The cross sections of the rear swing shaft and the front swing shaft are both cross-shaped, the rear end of the rear swing shaft is supported on the circular hole on the inner wall of the rear end of the middle part of the mounting cylinder through a bearing, and the front end of the front swing shaft is supported on the inner wall of the circular hole of the bearing support plate through a bearing, and a spacer is installed between the front swing shaft and the bearing to eliminate the interference caused by the rotation between the two, and the bearing support plate is fixed to the inner wall of the front end of the middle part of the mounting cylinder with screws, the rear side of the outer wall of the parallel glass plate seat is installed on the front end of the rear swing shaft, the annular large gear is sleeved on the rear end of the front swing shaft, and the front side of the outer wall of the parallel glass plate seat is fastened together with the large gear and the front swing shaft with connecting screws, the rear swing shaft, the front swing shaft and the large gear are coaxial and their axes are horizontal, parallel glass plates are installed in the parallel glass plate seat and are pressed by an elastic pressing piece, and the elastic pressing piece is fastened to the parallel glass plate seat with a pressing plate screw;

[0009] A pinion support plate is mounted on the middle side wall of the mounting cylinder with screws, and a hole is provided on the pinion support plate for fixing the pinion shaft seat; the pinion is in the form of a gear shaft, one end of the pinion is machined with involute cylindrical spur teeth, and the other end of the pinion is a shaft, the pinion shaft diameter is equal to the inner hole diameter of the pinion shaft seat and the inner hole diameter of the pinion shaft, the center lines of the pinion, the pinion shaft seat, the wide gasket, and the pinion shaft are on the same axis, the tooth end of the pinion is on the same horizontal line as the large gear and meshes with each other; the pinion shaft The end passes through the inner hole of the pinion shaft seat and the wide gasket, and the protruding end of the pinion is inserted into the inner hole of the pinion shaft and fixed with a tapered pin; the pinion shaft can rotate around the axis in the inner hole of the pinion shaft seat; a differential reading cylinder is provided on the front end of the pinion shaft, and the pinion shaft and the differential reading cylinder are fastened by a reading cylinder screw; the cover screws install the side cover on the middle outer wall of the mounting cylinder, and the fixed indicator cylinder is installed on the side cover with the fixed indicator cylinder screw; the outer ring of the differential reading cylinder is sleeved on the outer wall of the annular step surface of the fixed indicator cylinder.

[0010] A waist-shaped groove is provided at the right end of the mounting tube, corresponding to the position of the fine-tuning wedge-shaped mirror seat, which runs through the side wall of the mounting tube. The fine-tuning hole on the fine-tuning wedge-shaped mirror seat can be operated through the waist-shaped groove; a retaining ring is provided on the outer circular surface where the waist-shaped groove is located. The fine-tuning wedge-shaped mirror, the fine-tuning wedge-shaped mirror seat and the fine-tuning wedge-shaped mirror pressure ring complete the fine-tuning function. After the adjustment is completed, the retaining ring is rotated to block the waist-shaped groove on the mounting tube to play a protective role.

[0011] The transmission ratio of the large gear to the small gear is 10:1.

[0012] The optical axes of the rotating wedge mirror, the parallel glass plate and the fine-adjusting wedge mirror are coaxial with the mechanical axis of the mounting tube.

[0013] An adjustment gasket is provided between the mating surface of the rotating wedge mirror seat and the mounting tube. The thickness of the adjustment gasket can eliminate the axial installation clearance of the rotating wedge mirror seat to ensure that the rotating wedge mirror can only rotate around the optical axis, thereby playing the role of i-angle calibration.

[0014] Tighten the outside of the limit pin with a nut.

[0015] There is one indicator line engraved on the side wall of the fixed indicator cylinder, and 200 reading scale lines engraved on the outer ring of the differential reading cylinder.

[0016] The diameter of the end of the limiting pin is equal to the width of the annular groove.

[0017] The present invention employs an optical amplification method, employing a rotating wedge mirror and oscillating parallel glass plates. This structure allows for precise calibration of the level's angular error and micrometer error within ±30 seconds. The rotation of the rotating wedge mirror causes the optical axis to deflect precisely in the vertical plane, aligning it with the optical axis of the level being tested. The vertical deflection angle of the optical axis is the level's angular error. This deflection angle can be directly read from the circular scale on the rotating wedge mirror base. The parallel glass plates oscillate about the oscillation axis, causing a slight vertical translation of the optical axis. This translation is amplified by a gear transmission mechanism, meeting the calibration requirements for the level's micrometer error.

[0018] The beneficial effects of the present invention are:

[0019] 1. Simple operation and high reading accuracy, it can well meet the calibration requirements of DS05, DS1 and DS3 level i angle and micrometer indicators;

[0020] 2. The structure is small and compact, easy to carry, and can be used with a parallel light tube to meet the indoor and on-site calibration work of various levels. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the front view of the present invention;

[0022] Figure 2 for Figure 1 Left view of;

[0023] Figure 3 for Figure 1 Top view (full section);

[0024] Figure 4 It is a cross-sectional view along the center line of the pinion;

[0025] Figure 5 It is a cross-sectional view along the center line of the large gear;

[0026] Figure 6 is a cross-sectional view along the annular groove;

[0027] Figure 7 This is a detailed diagram of gear meshing;

[0028] Figure 8 This is a diagram showing the status of the level being used;

[0029] As shown in the figure: 1-rotating wedge mirror, 2-rotating wedge mirror seat, 3-rotating wedge mirror pressure ring, 4-parallel glass plate, 5-parallel glass plate seat, 6-fine-tuning wedge mirror, 7-fine-tuning wedge mirror seat, 8-retaining ring, 9-fine-tuning wedge mirror pressure ring, 10-large gear, 11-small gear, 12-small gear connecting shaft, 13-fixed indicator cylinder, 14-differential reading cylinder, 15-limiting axis pin, 16-rear swing shaft, 17-mounting cylinder, 18-bearing, 19-bearing support plate, 20-side cover, 21-small gear shaft seat, 22-small gear support Plate, 23-pressure plate screw, 24-i angle indicator line, 25-positioning ring, 26-elastic pressure piece, 27-front swing shaft, 28-connecting screw, 29-cover screw, 30-fixed indicator tube screw, 31-annular scale, 32-fine-tuning hole, 33-waist-shaped groove, 34-elastic pressure ring, 35-annular groove, 36-optical axis, 37-parallel light tube, 38-level instrument to be tested, 39-tightening nut, 40-taper pin, 41-adjusting gasket, 42-indicator line, 43-reading tube screw, 44-spacer, 45-wide gasket. DETAILED DESCRIPTION

[0030] The present invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic diagrams that illustrate the basic structure of the present invention in a schematic manner.

[0031] An optical micrometer device for calibrating a level comprises a horizontally placed, tubular mounting tube 17, the right end outer wall of an annular rotating wedge-shaped mirror base 2 being embedded from left to right into the inner wall of a left port of the mounting tube 17, an annular groove 35 being provided on the right end outer wall of the rotating wedge-shaped mirror base 2, two axis screw holes penetrating the side wall of the mounting tube 17 being provided on the left end outer wall of the mounting tube 17 and corresponding to the position of the rotating wedge-shaped mirror base 2, two limiting axis pins 15 being screwed into the axis screw holes from the outside to the inside and mounted on the mounting tube 17, the distal end of the limiting axis pin 15 being inserted into the annular groove 35 on the right end outer wall of the rotating wedge-shaped mirror base 2, the distal end diameter of the limiting axis pin 15 being equal to the width of the annular groove 35, so that the rotating wedge-shaped mirror base 2 can only rotate about the optical axis but cannot Axial movement, the outer portion of the limiting pin 15 is tightened with a nut 39. The rotating wedge mirror 1 is installed in the rotating wedge mirror base 2 and is fixed by a rotating wedge mirror pressing ring 3. An elastic pressing ring 34 is installed on the inner side of the rotating wedge mirror pressing ring 3 to adjust the pressure on the rotating wedge mirror 1 and ensure the imaging quality of the optical system. A ring scale 31 with a scale range of 0 to ±30" is provided on the left end surface of the rotating wedge mirror base 2, and an i-angle indicator line 24 is provided on the upper left end of the mounting tube 17. An adjustment gasket 41 is provided between the mating surfaces of the rotating wedge mirror base 2 and the mounting tube 17. By changing the thickness of the adjustment gasket 41, the axial installation clearance of the rotating wedge mirror base 2 can be eliminated to ensure that the rotating wedge mirror 2 can only rotate about the optical axis 36, thereby playing the role of i-angle calibration.

[0032] An annular fine-tuning wedge-shaped mirror seat 7 is mounted on the inner wall of the right end of the mounting tube 17. A fine-tuning wedge-shaped mirror 6 is mounted within the fine-tuning wedge-shaped mirror seat 7 and secured by a fine-tuning wedge-shaped mirror pressing ring 9. A plurality of fine-tuning holes 32 are evenly distributed on the side surface of the fine-tuning wedge-shaped mirror seat 7. A positioning ring 25 is screwed into the interior of the right end of the mounting tube 17 via a thread, and the left end surface of the positioning ring 25 is aligned with the right end surface of the fine-tuning wedge-shaped mirror seat 7.

[0033] The cross-sections of the rear swing shaft 16 and the front swing shaft 27 are both cross-shaped. The rear end of the rear swing shaft 16 is supported by a bearing 18 on the circular hole in the inner wall of the rear end of the middle part of the mounting cylinder 17. The front end of the front swing shaft 27 is supported by a bearing 18 on the inner wall of the circular hole of the bearing support plate 19. A spacer 44 is provided between the front swing shaft and the bearing to eliminate the interference caused by the relative rotation between the two. The bearing support plate 19 is fixed to the inner wall of the front end of the middle part of the mounting cylinder 17 with screws. The rear side of the outer wall of the parallel glass plate seat 5 is mounted on the front end of the rear swing shaft 16, and the annular large gear 10 is sleeved on the rear end of the front swing shaft 27. The front side of the outer wall of the parallel glass plate seat 5 is fastened together with the large gear 10 and the front swing shaft 27 by connecting screws 28. The rear swing shaft 16, the front swing shaft 27 and the large gear 10 are coaxial and their axes are horizontal. The parallel glass plate 4 is installed in the parallel glass plate seat 5 and is pressed by an elastic pressing piece 26. The elastic pressing piece 26 is fastened to the parallel glass plate seat 5 with a pressing plate screw 23;

[0034] A pinion support plate 22 is mounted on the middle side wall of the mounting cylinder 17 with screws, and a hole is provided on the pinion support plate 22 to fix the pinion shaft seat 21; the pinion 11 is in the form of a gear shaft, one end of the pinion 11 is machined with involute cylindrical spur teeth, and the other end of the pinion 11 is a shaft, the shaft diameter of the pinion 11 is equal to the inner diameter of the pinion shaft seat 21 and the inner diameter of the pinion connecting shaft 12, the center lines of the pinion 11, the pinion shaft seat 21, the wide gasket 45, and the pinion connecting shaft 12 are on the same axis, the tooth end of the pinion 11 is on the same horizontal line as the large gear 10 and meshes with each other; the shaft end of the pinion 11 passes through the pinion The extended end of the pinion 11's shaft is inserted into the inner hole of the pinion coupling shaft 12 through the inner hole of the shaft seat 21 and the wide washer 45 and secured with a tapered pin 40. The pinion 11's shaft can rotate about its axis within the inner hole of the pinion shaft seat 21. A differential reading cylinder 14 is provided on the front end of the pinion coupling shaft 12, and the pinion coupling shaft 12 and the differential reading cylinder 14 are integrally connected by a reading cylinder screw 45. The cover screw 29 mounts the side cover 20 to the middle outer wall of the mounting cylinder 17, and the fixed indicator cylinder 13 is mounted on the side cover 20 using a fixed indicator cylinder screw 30. The outer ring of the differential reading cylinder 14 is sleeved on the outer wall of the annular step surface of the fixed indicator cylinder 13.

[0035] The transmission ratio between the large gear 10 and the small gear 11 is 10:1.

[0036] The optical axis 35 of the rotating wedge mirror 1 , the parallel glass plate 4 , and the fine-tuning wedge mirror 6 is coaxial with the mechanical axis of the mounting tube 17 .

[0037] Rotating the differential reading cylinder 14 by hand can drive the pinion 11 to rotate in the inner hole of the pinion shaft seat 21.

[0038] A waist-shaped groove 33 is provided at the right end of the mounting tube 17, corresponding to the position of the fine-tuning wedge-shaped mirror seat 7, which penetrates the side wall of the mounting tube 17. The fine-tuning hole 32 on the fine-tuning wedge-shaped mirror seat 7 can be operated through the waist-shaped groove 33; a retaining ring 8 is provided on the outer circular surface where the waist-shaped groove 33 is located, and the fine-tuning wedge-shaped mirror 6, the fine-tuning wedge-shaped mirror seat 7 and the fine-tuning wedge-shaped mirror pressing ring 9 complete the fine-tuning function. After the adjustment is completed, the retaining ring 8 is rotated to block the waist-shaped groove 33 on the mounting tube 17 to play a protective role.

[0039] Working principle:

[0040] 1. This optical micrometer device assembles two wedge-shaped mirrors, a rotating wedge mirror 1 and a fine-tuning wedge mirror 6, a parallel glass plate 4, a gear set consisting of a large gear 10 and a small gear 11, and related fine-motion and adjustment mechanisms, as well as a reading mechanism, onto a mounting tube 17. The optical axis 36 of the rotating wedge mirror 1, the parallel glass plate 4, and the fine-tuning wedge mirror 6 is coaxial with the mechanical axis of the mounting tube 17, and the optical principal cross-sections of the rotating wedge mirror 1 and the fine-tuning wedge mirror 6 are in a horizontal position.

[0041] 2. The parallel glass plate 4 is installed in the middle position between the rotating wedge mirror 1 and the fine-tuning wedge mirror 6 in the mounting cylinder 17. The two working surfaces of the parallel glass plate 4 are strictly parallel and connected to the differential reading cylinder 14 through a pair of large gears 10 and small gears 11;

[0042] 3. The large gear 10 is meshed with the small gear 11 and is mounted on the parallel glass plate holder 5. Rotating the differential reading cylinder 14 will drive the small gear connecting shaft 12 and the small gear 11 to rotate, thereby driving the large gear 10 and the parallel glass plate 4 to slowly swing around the rear swing axis 16 and the front swing axis 27. It is used in conjunction with the collimator 37. During calibration, this optical micrometer device is installed in front of the objective lens of the collimator 37, and the wedge lens 6 is fine-tuned toward the objective lens of the collimator 37.

[0043] 4. The crosshair target emitted by the collimator 37 passes through the fine-tuning wedge mirror 6, the parallel glass plate 4, and the rotating wedge mirror 1, and is finally received by the level 38 to be tested. When the parallel light emitted by the collimator 37 passes through the parallel glass plate 4, the swing of the parallel glass plate 4 causes the optical axis 36 to slowly translate in the vertical plane.

[0044] 5. By calculation, the translation amount is matched one-to-one with the scale on the differential reading tube 14, and the translation amount of the optical axis can be read by the differential reading tube 14. Therefore, the parallel glass plate 4, the large gear 10, the small gear 11 and the differential reading tube 14 and other components can complete the calibration work of the high-precision level micrometer.

[0045] 6. During calibration, aim the level 38 under test at the outgoing cross target emitted by the collimator 37 through the present optical micrometer device, rotate the differential reading tube 14 to make the optical axis produce a certain translation in the plumb plane, and then rotate the micrometer knob on the level 38 under test to aim at the cross target of the collimator 37 again; the difference between the micrometer reading of the level 38 under test and the reading on the differential reading tube 14 of the present optical micrometer device is the micrometer error of the level 38 under test.

[0046] The calibration of the level i angle is achieved through the following steps:

[0047] A. After the collimator 37 is leveled, the light emitted from the cross target passes through the optical micrometer device, and the emitted light is received by the level 38 to be tested. The cross target of the collimator 37 is observed through the eyepiece of the level 38 to be tested.

[0048] B. If the i-angle error of the level 38 being tested is zero, that is, the optical axis of the level being tested is horizontal, then the crosshairs of the collimator 37 within the field of view will coincide with the crosshairs of the reticle of the level 38 being tested;

[0049] C. If there is an angular error in the level 38 to be tested, the horizontal lines of the crosshairs of the collimator 37 and the horizontal lines of the crosshairs of the reticle of the level 38 to be tested will not coincide with each other, and will be separated by a distance in the vertical direction. At this time, the wedge-shaped mirror holder 2 is manually operated to rotate slowly, so that the rotating wedge mirror 1 rotates slowly around the optical axis 36 (the direction indicated by the arrow is the propagation direction of light). According to the principle of geometric optics, the rotation of the rotating wedge mirror 1 will cause the optical axis 36 to deflect by a certain angle. The angle of the optical axis deflection is The degree is in a certain relationship with the rotation angle of the rotating wedge mirror 1; at this time, observe through the eyepiece of the level 38 to be tested, and stop the operation when the rotating wedge mirror 1 is rotated to make the horizontal wire of the cross target of the collimator 37 coincide with the horizontal wire of the cross of the level 38 to be tested; at this time, the angular swing amount of the optical axis in the vertical plane can be read on the annular scale 31 of the rotating wedge mirror base 2; this swing amount corresponds to the i angular error of the level 38 to be tested, and the i angular error of the level to be tested can be accurately measured.

[0050] The fine-tuning wedge mirror 6 is mainly used to accurately level the optical axis of the optical system to meet the calibration requirements of high-precision levels. After the collimator 37 used in conjunction with this optical micrometer is roughly leveled, it can be further accurately leveled by the fine-tuning wedge mirror 6. In addition, if the optical axis is tilted due to factors such as long-term storage of the instrument or stress release, it can also be adjusted by the fine-tuning wedge mirror 6. The specific operation is: move the retaining ring 8 a certain distance along the central axis so that the retaining ring leaves the waist-shaped groove 33, and then use a lever to pass through the waist-shaped groove 33 of the mounting tube and insert it into the fine-tuning hole 32 on the side of the fine-tuning wedge mirror seat. Gently move the fine-tuning wedge mirror seat 7 to drive the fine-tuning wedge mirror 6 to slowly rotate, causing the optical axis to swing at a small angle, so that the final emitted parallel light is close to a horizontal state, meeting the calibration requirements of high-precision levels.

[0051] It should be understood that the specific embodiments described above are only used to explain the present invention and are not intended to limit the present invention. Obvious changes or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. An optical micrometer device for calibrating a level, comprising a horizontally placed, tubular mounting tube, characterized in that: The right end outer wall of the annular rotating wedge mirror seat is embedded from left to right into the inner wall of the left end of the mounting tube. An annular groove is provided on the right end outer wall of the rotating wedge mirror seat. Two axis pin screw holes are provided on the left end outer wall of the mounting tube, corresponding to the position of the rotating wedge mirror seat, and penetrate the side wall of the mounting tube. Two limiting axis pins are screwed into the axis pin screw holes from the outside to the inside and are mounted on the mounting tube. The ends of the limiting axis pins are inserted into the annular groove on the right end outer wall of the rotating wedge mirror seat. A rotating wedge mirror is installed in the rotating wedge mirror seat and is fixed by a rotating wedge mirror pressing ring. An annular scale is provided on the left end surface of the rotating wedge mirror seat, and an i-angle indicator line is provided on the upper left end of the mounting tube. An annular fine-tuning wedge-shaped mirror seat is mounted on the inner wall of the right end of the mounting tube. A fine-tuning wedge mirror is mounted in the fine-tuning wedge-shaped mirror seat and secured by a fine-tuning wedge-shaped mirror pressing ring. A plurality of fine-tuning holes are evenly arranged on the side of the fine-tuning wedge-shaped mirror seat. A positioning ring is screwed into the right end of the mounting tube via a thread, and the left end face of the positioning ring is aligned with the right end face of the fine-tuning wedge-shaped mirror seat. The cross sections of the rear swing shaft and the front swing shaft are both cross-shaped, the rear end of the rear swing shaft is supported on the circular hole on the inner wall of the rear end of the middle part of the mounting cylinder through a bearing, and the front end of the front swing shaft is supported on the inner wall of the circular hole of the bearing support plate through a bearing, and a spacer is installed between the front swing shaft and the bearing to eliminate the interference caused by the rotation between the two, and the bearing support plate is fixed to the inner wall of the front end of the middle part of the mounting cylinder with screws, the rear side of the outer wall of the parallel glass plate seat is installed on the front end of the rear swing shaft, the annular large gear is sleeved on the rear end of the front swing shaft, and the front side of the outer wall of the parallel glass plate seat is fastened together with the large gear and the front swing shaft by connecting screws, the rear swing shaft, the front swing shaft and the large gear are coaxial and their axes are horizontal, parallel glass plates are installed in the parallel glass plate seat and are pressed by an elastic pressing piece, and the elastic pressing piece is fastened to the parallel glass plate seat with a pressing plate screw; A pinion support plate is mounted on the middle side wall of the mounting cylinder with screws, and a hole is provided on the pinion support plate for fixing the pinion shaft seat; the pinion is in the form of a gear shaft, one end of the pinion is machined with involute cylindrical spur teeth, and the other end of the pinion is a shaft, the pinion shaft diameter is equal to the inner hole diameter of the pinion shaft seat and the inner hole diameter of the pinion shaft, the center lines of the pinion, the pinion shaft seat, the wide gasket, and the pinion shaft are on the same axis, the tooth end of the pinion is on the same horizontal line as the large gear and meshes with each other; the pinion shaft The end passes through the inner hole of the pinion shaft seat and the wide gasket, and the protruding end of the pinion is inserted into the inner hole of the pinion shaft and fixed with a tapered pin; the pinion shaft can rotate around the axis in the inner hole of the pinion shaft seat; a differential reading cylinder is provided on the front end of the pinion shaft, and the pinion shaft and the differential reading cylinder are fastened by a reading cylinder screw; the cover screws install the side cover on the middle outer wall of the mounting cylinder, and the fixed indicator cylinder is installed on the side cover with the fixed indicator cylinder screw; the outer ring of the differential reading cylinder is sleeved on the outer wall of the annular step surface of the fixed indicator cylinder.

2. The optical micrometer device for calibrating a level according to claim 1, characterized in that: A waist-shaped groove running through the side wall of the mounting tube is provided at the right end of the mounting tube, corresponding to the position of the fine-tuning wedge-shaped mirror seat, and a retaining ring capable of blocking the waist-shaped groove on the mounting tube is provided on the outer circular surface where the waist-shaped groove is located.

3. The optical micrometer device for calibrating a level according to claim 1, characterized in that: The transmission ratio of the large gear to the small gear is 10:

1.

4. The optical micrometer device for calibrating a level according to claim 1, characterized in that: The optical axes of the rotating wedge mirror, the parallel glass plate and the fine-adjusting wedge mirror are coaxial with the mechanical axis of the mounting tube.

5. The optical micrometer device for calibrating a level according to claim 1, characterized in that: An adjusting gasket is provided between the matching surface of the rotating wedge-shaped mirror seat and the mounting cylinder.

6. The optical micrometer device for calibrating a level according to claim 1, characterized in that: Tighten the outside of the limit pin with a nut.

7. The optical micrometer device for calibrating a level according to claim 1, characterized in that: There is one indicator line engraved on the side wall of the fixed indicator cylinder, and 200 engraved lines on the outer ring of the differential reading cylinder.

8. The optical micrometer device for calibrating a level according to claim 1, characterized in that: The diameter of the end of the limiting pin is equal to the width of the annular groove.

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