CN215114369U - Step shaft coaxiality detection device - Google Patents

Abstract

The utility model relates to a step axle axiality detection device. The utility model designs a conical cylinder of conical structure to treat the measuring step axle and fix to can satisfy the axle of different diameters fixed, application scope is wider, and can realize two axle supporting seats simultaneous movement through the drive mode of double helix lead screw, treat that the measuring axle presss from both sides tightly fixedly, and can make the axle rotate as a whole through the rotating shaft turning handle, through observing position pointer and circumferencial position calibrated scale simultaneously, can accurately control the angle that the measuring axle rotates, thereby be convenient for treat that the circumference different positions of measuring axle detect; the measuring device installed on the detection frame capable of sliding can be used for detecting the shaft to be detected, the three measuring devices are matched with the synchronous detection device, the detection efficiency and the detection precision are improved, the detection of different positions of the whole shaft can be realized by the movement of the detection frame, and the detection position is more comprehensive.

Description

Step shaft coaxiality detection device

Technical Field

The utility model relates to a work piece check out test set technical field specifically is a step axle axiality detection device.

Background

Coaxiality refers to the degree of non-coaxiality of the measured cylindrical axis to a reference axis, and coaxiality detection is a problem frequently encountered in machining measurement. The method for detecting the coaxiality at present is to detect by using two dial indicators and a gyroscope according to the following steps, wherein the detection mode can only detect cylindrical workpieces or cylindrical holes, and for a step shaft, the coaxiality of a large shaft and a small shaft of the step shaft cannot be detected. Other detection devices for the step shaft are difficult to operate and inconvenient to use, the detection efficiency of the step shaft is influenced, the coaxiality of the step shaft has a great influence on the installation precision of a workpiece, and particularly in the automobile industry, the step shaft needs to be ensured to have high coaxiality, so that a more accurate and better device is needed for detecting the coaxiality of the step shaft.

SUMMERY OF THE UTILITY MODEL

In view of the problems in the prior art, the utility model discloses a step shaft coaxiality detection device, which adopts the technical proposal that the device comprises a base, wherein a first chute and a second chute are respectively arranged at the two ends of the upper surface of the base, a first slide rod is fixedly connected in the first chute, a second slide rod is fixedly connected in the second chute, a double-screw lead screw is arranged in the middle of the base in a rotating fit manner, the end part of the double-screw lead screw is fixedly connected with a lead screw rotating handle, the lead screw rotating handle is positioned outside the base, one end of the circumference of the double-screw lead screw is a forward screw thread, the other end of the circumference of the double-screw lead screw is a reverse screw thread, a first shaft supporting seat is arranged in the first chute in a sliding fit manner, the first shaft supporting seat is arranged on the first slide rod in a sliding fit manner, the screw threads are arranged on the forward screw thread in a matching manner, a second shaft supporting seat is arranged in the second chute in a sliding fit manner, and screw-thread fit installs on the backspin thread, primary shaft supporting seat and secondary shaft supporting seat are the mirror image installation each other, base upper surface middle part fixedly connected with slide rail, slide rail and first litter, second litter and double helix lead screw are parallel to each other, sliding fit installs the test rack on the slide rail, equidistant three measuring device of fixedly connected with in test rack upper portion, three measuring device is that circular the contained angle of arranging and between is ninety degrees, utilize the test rack to remove and can realize three measuring device synchronous motion, be convenient for treat the different positions of axle that examines and detect, and three measuring device measures from three position and then can guarantee the measuring accuracy, can obviously react the axiality deviation of treating the axle that examines, promote detection efficiency.

As a preferred scheme of the utility model, the first shaft supporting seat comprises a first moving seat, two sides of the lower end of the first moving seat are respectively fixedly connected with a first side edge slide block, a first sliding connecting hole is arranged on the first side edge slide block, a first middle slide block is fixedly connected with the middle part of the lower end of the first moving seat, a positive rotation threaded hole is arranged on the first middle slide block, the first sliding connecting hole is slidably sleeved on a first slide rod, the positive rotation threaded hole is in threaded fit connection with the positive rotation thread, a first conical barrel is fixedly connected with the upper end of the first moving seat, a first rotating inner sleeve is rotatably and fittingly arranged in the first conical barrel, one end of the first rotating inner sleeve is rotatably and fittingly connected with the bottom of the first conical barrel, the other end of the first rotating inner sleeve extends out of the opening of the first conical barrel, a first circumferential direction dial is arranged on the open end face of the first conical barrel, and the second shaft has basically the same structure as the first shaft supporting seat, the device comprises a second movable seat, a second conical barrel, a second rotary inner sleeve, a second circumferential direction dial, a second side sliding block, a second sliding connecting hole, a second middle sliding block and a reverse rotation threaded hole.

As a preferred scheme of the utility model, a first conical barrel, a first rotating inner sleeve, a second conical barrel and a second rotating inner sleeve are coaxial, four azimuth pointers are uniformly and fixedly distributed at the open edge of the first rotating inner sleeve, two corresponding connecting lines are arranged between the four azimuth pointers, the two connecting lines are mutually vertical, the intersection point is the circle center of the open end of the first rotating inner sleeve, the azimuth pointers are attached to the surface of a first circumferential azimuth dial scale, the center of the tail end of the first rotating inner sleeve is fixedly connected with a rotating buckle head which is connected to the tail end of the first conical barrel in a rotating fit way, the side surface of the first rotating inner sleeve is fixedly connected with a circumferential slide rail close to the open position of the first rotating inner sleeve, the circumferential slide rail is buckled in a sliding fit way in a groove on the inner wall of the first conical barrel, the second rotating inner sleeve has the same structure as the first rotating inner sleeve, and utilizes the position change of the azimuth pointers on the first circumferential azimuth dial scale, the control of the rotation angle of the shaft to be measured is facilitated.

As an optimal scheme of the utility model, the test stand includes the sliding seat, and the buckle slide has been seted up to the sliding seat lower surface, and buckle slide slip buckle is on the slide rail, sliding seat top fixedly connected with mounting bracket, and the mounting bracket is connected position fixedly connected with strengthening rib with the sliding seat, and mounting bracket upper portion is semicircle ring portion, and semicircle ring portion is the axis coincidence of semicircle ring shape and centre of a circle and first toper section of thick bamboo, and three measuring device is fixed connection at semicircle ring portion both ends and intermediate position respectively.

As a preferred scheme, measuring device includes the measurement seat of fixed connection on semicircle ring portion, the notch has been seted up to the positive intermediate position of measurement seat, the notch both sides openly are the offset scale face at the measurement seat, it has the measuring board to peg graft to measure seat middle part sliding fit, the positive fixedly connected with offset pointer of measuring board, the offset pointer slides and passes the notch and laminate on the offset scale face, the laminating of measuring board back magnetic adsorption is on magnet, magnet is inlayed in measuring the seat, measure the spherical contact of board tip fixedly connected with, the radial direction of measuring board along semicircle ring portion, the equal directional centre of a circle of semicircle ring portion of spherical contact, magnet makes it can slide under the exogenic action to the adsorption affinity of measuring board, alright rigid when having no exogenic force, thereby be convenient for measure the slip and the fixed of board.

The utility model has the advantages that: the utility model designs a conical cylinder of conical structure to treat the measuring step axle and fix to can satisfy the axle of different diameters fixed, application scope is wider, and can realize two axle supporting seats simultaneous movement through the double helix lead screw drive mode, treat that the measuring axle presss from both sides tightly fixedly, and can make the axle rotate as a whole through the rotation axle twist grip, simultaneously through observing position pointer and circumferencial position calibrated scale, can accurately control the angle that the measuring axle rotates, thereby be convenient for treat that the circumference different positions of measuring axle detect; the measuring device installed on the detection frame capable of sliding can be used for detecting the shaft to be detected, the three measuring devices are matched with the synchronous detection device, the detection efficiency and the detection precision are improved, the detection of different positions of the whole shaft can be realized by the movement of the detection frame, and the detection position is more comprehensive. The whole device has the advantages of simple structure, convenience in production and processing, convenience in use, easiness in learning and use and convenience in operation of users.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a half sectional view of the overall structure of the present invention;

FIG. 3 is a schematic view of the base structure of the present invention;

FIG. 4 is a schematic view of a first shaft support seat according to the present invention;

fig. 5 is a schematic structural view of a first rotary inner sleeve of the present invention;

FIG. 6 is a schematic structural view of a second shaft support seat of the present invention;

FIG. 7 is a partial sectional view of the structure of the measuring stand and the measuring device of the present invention;

fig. 8 is a state reference diagram of the present invention when detecting the step shaft.

In the figure: 1 base, 101 first runner, 102 second runner, 103 first sliding rod, 104 second sliding rod, 2 first shaft support seat, 201 first movable seat, 202 first tapered barrel, 203 first rotary inner sleeve, 2031 azimuth pointer, 2032 rotary buckle head, 2033 circular slide rail, 204 first circular azimuth dial, 205 first side slide block, 206 first slide connection hole, 207 first middle slide block, 208 forward screw hole, 3 second shaft support seat, 301 second movable seat, 302 second tapered barrel, 303 second rotary inner sleeve, 304 second circular azimuth dial, 305 second side slide block, 306 second slide connection hole, 307 second middle slide block, 308 reverse screw hole, 309 shaft handle, 4 double screw, 401 screw shaft rotation handle, 402 forward screw thread, 403 reverse screw thread, 5 slide rail, 6 detection rack, 601 slide seat, 602 buckle, 603 installation rack, 604 reinforcing rib, 605 semicircular ring part, 2 first shaft support seat, 201 first movable seat, 202 first tapered barrel, 202 second tapered barrel, 203 second rotary inner sleeve, 301 second tapered barrel, 301 second movable seat, 302 second sliding block, 306 second circular slide rail, 306 second sliding connection hole, 307 second middle slide block, 308 reverse screw hole, 309 shaft handle, 4 double screw, 401 screw handle, 401 screw, 402 forward screw thread, 403 reverse screw, 3 reverse screw thread, 3 slide rail, 3 detection rack, 6 detection rack, 601 slide rail, 602 slide rail, 603 slide rail, and 602 slide rail, 7 measuring device, 701 measuring seat, 702 offset scale surface, 703 notch, 704 measuring plate, 705 offset pointer, 706 ball contact and 707 magnet.

Detailed Description

Example 1

As shown in FIGS. 1 to 8, the device for detecting coaxiality of step shafts of the present invention adopts the technical solution that comprises a base 1, wherein a first sliding groove 101 and a second sliding groove 102 are respectively formed at two ends of the upper surface of the base 1, a first sliding rod 103 is fixedly connected in the first sliding groove 101, a second sliding rod 104 is fixedly connected in the second sliding groove 102, a double screw 4 is rotatably fitted in the middle of the base 1, a screw rotating handle 401 is fixedly connected to the end of the double screw 4, the screw rotating handle 401 is located outside the base 1, a forward thread 402 is formed at one end of the circumference of the double screw 4, a reverse thread 403 is formed at the other end of the circumference of the double screw 4, a first shaft supporting seat 2 is slidably fitted in the first sliding groove 101, the first shaft supporting seat 2 is slidably fitted in the first sliding rod 103 and is threadedly fitted in the forward thread 402, a second shaft supporting seat 3 is slidably fitted in the second sliding groove 102, the second shaft supporting seat 3 is installed on the second sliding rod 104 in a sliding fit manner and installed on the reverse-rotation thread 403 in a thread fit manner, the first shaft supporting seat 2 and the second shaft supporting seat 3 are installed in a mirror image manner, the first shaft supporting seat 2 comprises a first moving seat 201, two sides of the lower end of the first moving seat 201 are respectively and fixedly connected with a first side edge slide block 205, a first sliding connecting hole 206 is formed in the first side edge slide block 205, a first middle slide block 207 is fixedly connected to the middle of the lower end of the first moving seat 201, a forward-rotation thread hole 208 is formed in the first middle slide block 207, the first sliding connecting hole 206 is slidably sleeved on the first sliding rod 103, the forward-rotation thread hole 208 is in a thread fit manner and connected to the forward-rotation thread 402, a first conical barrel 202 is fixedly connected to the upper end of the first moving seat 201, a first rotating inner sleeve 203 is installed in the first conical barrel 202 in a rotating fit manner, a first circumferential direction dial 204 is arranged on the open end face of the first conical barrel 202, four direction pointers 2031 are uniformly distributed and fixedly connected to the edge of the opening of the first rotating inner sleeve 203, two corresponding connecting lines are arranged between the four direction pointers 2031, the two connecting lines are perpendicular to each other, the intersection point is the center of the opening of the first rotating inner sleeve 203, the direction pointers 2031 are attached to the surface of the first circumferential direction dial 204, the center of the tail end of the first rotating inner sleeve 203 is fixedly connected with a rotating buckle head 2032, the rotating buckle head 2032 is connected to the tail end of the first tapered barrel 202 in a rotating fit manner, a circumferential slide rail 2033 is fixedly connected to the side surface of the first rotating inner sleeve 203 close to the opening position, the circumferential slide rail 2033 is clamped in a groove in the inner wall of the first tapered barrel 202 in a sliding fit manner, the second shaft support seat 3 and the first shaft support seat 2 have basically the same structure, and comprise a second moving seat 301, a second tapered barrel 302, a second rotating inner sleeve 303, a second circumferential direction dial 304, a second side edge slide block 305, a second slide connection hole 306, The difference between the second middle slider 307 and the reverse-rotation threaded hole 308 is that a shaft rotating handle 309 is fixedly connected to the tail end of the second rotating inner sleeve 303, the shaft rotating handle 309 is located on the outer side of the tail end of the second conical barrel 302, the first conical barrel 202, the first rotating inner sleeve 203, the second conical barrel 302 and the second rotating inner sleeve 303 are coaxial, the second rotating inner sleeve 303 can rotate by rotating the shaft rotating handle 309, so that the shaft to be measured clamped between the first rotating inner sleeve 203 and the second rotating inner sleeve 303 is driven to rotate synchronously to adjust the position to be measured of the shaft to be measured, the second rotating inner sleeve 303 and the first rotating inner sleeve 203 are identical in structure, and the rotation angle of the shaft to be measured can be controlled conveniently by using the position change of the azimuth pointer 2031 on the first circumferential azimuth dial 204.

The middle part of the upper surface of the base 1 is fixedly connected with a slide rail 5, the slide rail 5, a first slide rod 103, a second slide rod 104 and a double-screw lead screw 4 are parallel to each other, a detection frame 6 is arranged on the slide rail 5 in a sliding fit manner, three measuring devices 7 are fixedly connected to the upper part of the detection frame 6 at equal intervals, the detection frame 6 comprises a slide seat 601, the lower surface of the slide seat 601 is provided with a buckle slide way 602, the buckle slide way 602 is slidably buckled on the slide rail 5, a mounting frame 603 is fixedly connected to the upper part of the slide seat 601, the connecting part of the mounting frame 603 and the slide seat 601 is fixedly connected with a reinforcing rib 604, the upper part of the mounting frame 603 is a semicircular ring part 605, the semicircular ring part 605 is in a semicircular ring shape, the circle center of the semicircular ring is coincided with the axis of the first conical cylinder 202, the three measuring devices 7 are respectively fixedly connected to the two ends and the middle position of the semicircular ring part 605, the included angle between the three measuring devices is ninety degrees, and the synchronous movement of the detection frame 6 can realize the synchronous movement of the three measuring devices 7, the different positions of treating the survey axle of being convenient for detect, and three measuring device 7 is measured from three position then can guarantee measuring accuracy, can obviously reflect the axiality deviation of treating the survey axle, promotes detection efficiency.

The measuring device 7 comprises a measuring seat 701 fixedly connected to the semicircular ring part 605, a notch 703 is arranged in the middle of the front surface of the measuring seat 701, offset scale surfaces 702 are arranged on the two sides of the notch 703 on the front surface of the measuring seat 701, a measuring plate 704 is inserted in the middle of the measuring seat 701 in a sliding fit manner, an offset pointer 705 is fixedly connected to the front surface of the measuring plate 704, the offset pointer 705 penetrates through the notch 703 in a sliding manner and is attached to the offset scale surfaces 702, the back surface of the measuring plate 704 is attached to a magnet 707 in a magnetic adsorption manner, the magnet 707 is embedded in the measuring seat 701, the end of the measuring plate 704 is fixedly connected with a spherical contact 706, the measuring plate 704 is along the radial direction of the semicircular ring part 605, the spherical contacts 706 point to the center of the semicircular ring part 605, the magnet 707 can slide under the action of external force due to the adsorption force of the measuring plate 704, and the measuring plate 704 can be fixed without external force, so that the measuring plate 704 can slide and be fixed conveniently.

The utility model discloses a theory of operation: the step shaft to be measured is placed between the first shaft supporting seat 2 and the second shaft supporting seat 3, then the screw rod 4 drives the first shaft supporting seat 2 and the second shaft supporting seat 3 to be closed synchronously by rotating the screw rod rotating handle 401, so that the step shaft to be detected is clamped by the step shaft to be detected, two ends of the step shaft to be detected are respectively propped against the inner walls of the second rotating inner sleeve 303 and the first rotating inner sleeve 203, after the fixation is finished, the detection frame 6 is moved to the position to be detected, then the measuring board 704 is pushed to make the three ball-shaped contact tips 706 respectively push against the circumference of the step shaft to be measured from three directions, the positions of the offset pointers 705 on the three measuring devices 7 on the offset scale 702 are observed, the numerical values are respectively read and recorded, the carriage 6 is then slid slowly to move the ball 706 of the measuring device 7 against the circumferential wall of the shaft to be measured, and simultaneously observing whether the three offset pointers 705 move or not, wherein if the three offset pointers move, the measured roundness of different positions of the section of the shaft has deviation. The three measuring devices 7 are moved to the other stage shaft of the step shaft to be measured, the measured values are obtained in the same way, the measured values of the two stages of shafts are compared, if the difference values of the two measured values of the two stages of shafts of the three measuring devices 7 are the same, the two stages of shafts are coaxial, if the difference values of the two measured values of the two stages of shafts of the three measuring devices 7 are different, the different shafts of the two stages of shafts are indicated, and the axis deviation direction and the axis deviation size can be obtained by judging the difference values. The second rotating inner sleeve 303 can be rotated by rotating the shaft rotating handle 309, so that the step shaft to be measured clamped between the first rotating inner sleeve 203 and the second rotating inner sleeve 303 is driven to synchronously rotate, the measurement position of the step shaft to be measured is adjusted, the measurement point position is increased, and the measurement precision is ensured. The magnet 707 in the measuring device 7 can slide under the action of external force due to its attraction to the measuring plate 704, and can be fixed without external force, thereby facilitating the sliding and fixing of the measuring plate 704 and preventing the measuring plate 704 from sliding freely.

In the description of the present invention, it is to be understood that the terms "central", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing and simplifying the description, but not for indicating or implying that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the invention, and further that the terms "first", "second", etc., are used only for descriptive purposes and are not to indicate or imply relative importance or imply the number of technical features being referred to, whereby the features defined as "first", "second", etc., may explicitly or implicitly include one or more such features, in the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or the two elements may be connected through an intermediate medium, and the specific meaning of the above terms in the present invention can be understood by those skilled in the art through specific situations.

Components not described in detail herein are prior art.

Although the present invention has been described in detail with reference to the specific embodiments, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge range of those skilled in the art, and modifications or variations without creative efforts are still within the scope of the present invention.

Claims (5)

1. The utility model provides a step axle axiality detection device which characterized in that: the screw rod type screw rod comprises a base (1), wherein a first sliding groove (101) and a second sliding groove (102) are respectively formed in two ends of the upper surface of the base (1), a first sliding rod (103) is fixedly connected in the first sliding groove (101), a second sliding rod (104) is fixedly connected in the second sliding groove (102), a double-screw lead screw (4) is installed in the middle of the base (1) in a rotating fit mode, a lead screw rotating handle (401) is fixedly connected at the end part of the double-screw lead screw (4), the lead screw rotating handle (401) is located outside the base (1), a forward thread (402) is arranged at one end of the circumference of the double-screw lead screw (4), a reverse thread (403) is arranged at the other end of the circumference of the double-screw lead screw, a first shaft supporting seat (2) is installed in the first sliding groove (101) in a sliding fit mode, the first shaft supporting seat (2) is installed on the first sliding rod (103) in a sliding fit mode, and is installed on the forward thread (402) in a threaded fit mode, sliding fit installs second axle supporting seat (3) in second spout (102), second axle supporting seat (3) sliding fit installs on second litter (104) to screw-thread fit installs on backspin screw thread (403), first axle supporting seat (2) with second axle supporting seat (3) are the mirror image installation each other, base (1) upper surface middle part fixedly connected with slide rail (5), slide rail (5) with first litter (103) second litter (104) with double helix screw (4) are parallel to each other, sliding fit installs on slide rail (5) and detects frame (6), detect three measuring device (7) of equidistant fixedly connected with in frame (6) upper portion, it is three measuring device (7) are circular the contained angle of arranging and between be ninety degrees.

2. The step shaft coaxiality detection device according to claim 1, wherein: the first shaft supporting seat (2) comprises a first moving seat (201), two sides of the lower end of the first moving seat (201) are fixedly connected with a first side sliding block (205) respectively, a first sliding connecting hole (206) is formed in the first side sliding block (205), a first middle sliding block (207) is fixedly connected to the middle of the lower end of the first moving seat (201), a forward-rotation threaded hole (208) is formed in the first middle sliding block (207), the first sliding connecting hole (206) is sleeved on the first sliding rod (103) in a sliding mode, the forward-rotation threaded hole (208) is connected to the forward-rotation thread (402) in a threaded matching mode, a first conical barrel (202) is fixedly connected to the upper end of the first moving seat (201), a first rotating inner sleeve (203) is installed in the first conical barrel (202) in a rotating matching mode, one end of the first rotating inner sleeve (203) is connected to the bottom of the first conical barrel (202) in a rotating matching mode, the other end of the first conical barrel (202) extends out of an opening, a first circumferential direction dial (204) is arranged on the open end face of the first conical barrel (202), the second shaft supporting seat (3) and the first shaft supporting seat (2) are basically the same in structure and comprise a second moving seat (301), a second conical barrel (302), a second rotating inner sleeve (303), a second circumferential direction dial (304), a second side edge sliding block (305), a second sliding connecting hole (306), a second middle sliding block (307) and a reverse rotation threaded hole (308), the difference is that a shaft rotating handle (309) is fixedly connected to the tail end of the second rotating inner sleeve (303), and the shaft rotating handle (309) is located on the outer side of the tail end of the second conical barrel (302).

3. The step shaft coaxiality detection device according to claim 2, wherein: the first conical barrel (202), the first rotating inner sleeve (203), the second conical barrel (302) and the second rotating inner sleeve (303) are coaxial, four direction pointers (2031) are uniformly and fixedly distributed on the edge of an opening of the first rotating inner sleeve (203), two corresponding connecting lines are arranged between the four direction pointers (2031), the two connecting lines are perpendicular to each other, the intersection point is the center of the opening of the first rotating inner sleeve (203), the direction pointers (2031) are attached to the surface of the first circumferential direction dial (204), the center of the tail end of the first rotating inner sleeve (203) is fixedly connected with a rotating buckle head (2032), the rotating buckle head (2032) is connected to the tail end of the first conical barrel (202) in a rotating fit manner, a circumferential slide rail (2033) is fixedly connected to the side surface of the first rotating inner sleeve (203) close to the opening position of the side surface of the first rotating inner sleeve, and the circumferential slide rail (2033) is fastened in a sliding fit manner in a groove in the inner wall of the first conical barrel (202), the second rotary inner sleeve (303) is the same as the first rotary inner sleeve (203).

4. The step shaft coaxiality detection device according to claim 3, wherein: the detection frame (6) comprises a sliding seat (601), a buckle slide way (602) is arranged on the lower surface of the sliding seat (601), the buckle slide way (602) is buckled on the slide rail (5) in a sliding mode, a mounting frame (603) is fixedly connected to the upper portion of the sliding seat (601), the mounting frame (603) is fixedly connected with reinforcing ribs (604) at the connecting portion of the sliding seat (601), the upper portion of the mounting frame (603) is a semicircular ring portion (605), the semicircular ring portion (605) is semicircular ring-shaped, the circle center of the semicircular ring portion coincides with the axis of the first conical cylinder (202), and the measuring device (7) is fixedly connected to two ends of the semicircular ring portion (605) and the middle position of the semicircular ring portion respectively.

5. The step shaft coaxiality detection device according to claim 4, wherein: the measuring device (7) comprises a measuring seat (701) fixedly connected to the semicircular ring part (605), a notch (703) is formed in the middle of the front face of the measuring seat (701), offset scale surfaces (702) are arranged on the front faces of the measuring seat (701) on two sides of the notch (703), a measuring plate (704) is inserted in the middle of the measuring seat (701) in a sliding fit mode, an offset pointer (705) is fixedly connected to the front face of the measuring plate (704), the offset pointer (703) penetrates through the notch (703) in a sliding mode and is attached to the offset scale surfaces (702), the back face of the measuring plate (704) is attached to a magnet (707) in a magnetic adsorption mode, the magnet (707) is embedded into the measuring seat (701), a spherical contact (706) is fixedly connected to the end portion of the measuring plate (704), and the measuring plate (704) is located along the radial direction of the semicircular ring part (605), the spherical contacts (706) point to the center of the semi-circular ring part (605).

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