A positioning structure of a cylindricity measuring instrument

Abstract

The utility model discloses a kind of positioning structure of cylindricity measuring instrument, comprising: mounting seat, the top surface of the mounting seat is fixedly connected with positioning round plate, the top surface of the positioning round plate is symmetrically fixedly connected with main vertical plate in both ends, the outer side of the main vertical plate is connected with lifting groove frame through, the inside of the lifting groove frame is slidably connected with lifting slider, the inside of the lifting slider is fixedly penetrated with hydraulic telescopic rod, the end surface of the hydraulic telescopic rod is fixedly connected with V-shaped clamping block, the top surface of the positioning round plate is symmetrically slidably connected with vice vertical plate one and vice vertical plate two in other two ends respectively;In the utility model, through the combination of main vertical plate and vice vertical plate that can be lifted and stored, form multiple groups of symmetrically distributed clamping units, and vice vertical plate is equipped with high-precision lifting and clamping assembly identical with main vertical plate, compared with the fixed clamping structure of similar equipment, it can be according to workpiece size, especially eccentric cylindrical workpiece of different diameters, flexible selection vertical plate use quantity.

Description

Technical Field

[0001] This utility model relates to the field of positioning equipment technology, specifically a positioning structure for a cylindricity measuring instrument. Background Technology

[0002] In the field of cylindricity measurement, accurate positioning of the workpiece is a key factor in ensuring measurement accuracy. The positioning fixture structure of existing cylindricity measuring instruments still has room for improvement in terms of adaptability and positioning accuracy.

[0003] Existing Chinese patent document CN106123839B discloses a general-purpose fixture assembly for a cylindricity measuring instrument, comprising: a base disk fixedly connected to the worktable of the cylindricity measuring instrument; an X-axis guide rail and an X-axis scale fixedly mounted on the base disk; a movable positioning block slidably fitted on the X-axis guide rail; multiple scale holes evenly spaced on the X-axis scale; and multiple positioning block holes evenly spaced on the movable positioning block; a fixed clamping block is provided on the upper surface of the movable positioning block, the fixed clamping block comprising a horizontal plate and a vertical plate; a reference positioning block is provided on the inner side of the vertical plate; and a screw is provided at the other end of the horizontal plate. The fixture consists of a fixed block and a Y-bolt. A Y-groove is also provided on the horizontal plate, in which a movable clamping block slides. The front end of the Y-bolt is fixed to the movable clamping block. Through this method, the patent makes the fixture universal, and only a few parts need to be replaced when changing products, thereby saving manufacturing costs and reducing fixture design and processing time. However, the positioning structure of this cylindricity measuring instrument still has shortcomings: its clamping structure is relatively fixed and mainly relies on the cooperation of a single set of fixed clamping blocks and movable clamping blocks. For cylindrical workpieces with complex shapes such as different diameters and eccentricities, it is difficult to form stable clamping from multiple directions, and the range of applicability is narrow. Utility Model Content

[0004] The purpose of this utility model is to solve the problem that the clamping structure of the above-mentioned cylindricity measuring instrument is relatively fixed, mainly relying on the cooperation of a single set of fixed clamping blocks and moving clamping blocks, making it difficult to form stable clamping from multiple directions for cylindrical workpieces with complex shapes such as different diameters and eccentricities, and resulting in a narrow range of applicability. Therefore, this utility model provides a cylindricity measuring instrument positioning structure.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a positioning structure for a cylindricity measuring instrument, comprising: a mounting base, a positioning circular plate fixedly connected to the top surface of the mounting base, main upright plates symmetrically fixedly connected to both ends of the top surface of the positioning circular plate, a lifting groove frame extending through the outer side of the main upright plate, a servo motor one and a servo motor two symmetrically fixedly connected to the top end of the lifting groove frame, a rotating screw one and a rotating screw two respectively provided at the output ends of the servo motor one and the servo motor two, the same set of lifting sliders being screwed onto the outer side of the rotating screw one and the rotating screw two, a hydraulic telescopic rod being fixedly inserted inside the lifting slider, a V-shaped clamping block being fixedly connected to the end face of the hydraulic telescopic rod, and a secondary upright plate one and a secondary upright plate two symmetrically slidably connected to the other two ends of the top surface of the positioning circular plate.

[0006] As a further embodiment of this utility model: both the first rotating screw and the second rotating screw pass through the top of the lifting groove frame and are located inside the lifting groove frame. The lifting slider has two sets of screw hole structures symmetrically opened at both ends, and the screw hole specifications are adapted to the specifications of the first rotating screw and the second rotating screw.

[0007] As a further embodiment of this utility model: the main upright plate, the first auxiliary upright plate and the second auxiliary upright plate are each provided in two sets, and are arranged in a circular distribution on the top surface of the positioning circular plate. The first auxiliary upright plate and the second auxiliary upright plate are provided with the same number and specifications of lifting slot frames, servo motor one, rotating screw one, servo motor two, rotating screw two, lifting slider, screw hole, hydraulic telescopic rod and V-shaped clamping block structure as the main upright plate.

[0008] As a further improvement of this utility model: the positioning circular plate has a lifting guide groove through which corresponding positions of the auxiliary upright plate one and the auxiliary upright plate two are provided. The auxiliary upright plate one and the auxiliary upright plate two are symmetrically fixed with lifting guide slide structures on both sides. The combined specifications of the horizontal cross-section of the auxiliary upright plate one and the auxiliary upright plate two and the cross-section of the lifting guide slide at both ends are adapted to the specifications of the lifting guide groove, so that the two sets of auxiliary upright plates one and two can be lowered for storage when idle.

[0009] As a further improvement of this utility model: both sets of auxiliary upright plates one and two are fixedly connected to the top surface with anti-detachment top plates. The anti-detachment top plates are larger than the lifting guide groove in size, so as to prevent auxiliary upright plates one and two from completely slipping out of the positioning circular plate range.

[0010] As a further improvement of this utility model: a rotating ring is movably sleeved on the outside of the mounting base, closely attached to the bottom surface of the positioning circular plate. A support frame structure is fixedly connected to the outside of the rotating ring at the corresponding positions of the two sets of auxiliary upright plates one and two, so that the two sets of auxiliary upright plates one and two are level with the main upright plate when they are put into use. A limiting ring structure is fixedly sleeved on the outside of the mounting base, closely attached to the bottom surface of the rotating ring, to limit the state of the rotating ring.

[0011] As a further improvement of this utility model: a mounting ring is fixedly sleeved on the outer side of the bottom end of the mounting base, and several sets of fixing bolts are evenly inserted into the mounting ring in the radial direction, so as to stably install the entire device on the operating table of the cylindricity measuring instrument.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. In this utility model, the main upright plate is combined with the liftable and retractable secondary upright plate to form multiple symmetrically distributed clamping units. The secondary upright plate is equipped with high-precision lifting and clamping components that are completely identical to those of the main upright plate. Compared with the fixed clamping structure of similar equipment, it can flexibly select the number of upright plates to use according to the size of the workpiece, especially for cylindrical workpieces with different diameters and eccentricity. The idle secondary upright plates can be stored to reduce space occupation. At the same time, the rotating ring and the support frame block ensure the horizontal consistency between the secondary upright plate and the main upright plate, realize the stable clamping of workpieces of different specifications, and greatly improve the adaptability of the equipment to cylindrical workpieces with complex shapes.

[0014] 2. This utility model adopts a structure with a dual-screw synchronous drive and precise screw hole matching, which enables the lifting slider to move smoothly and vertically within the lifting slot frame, avoiding swaying and tilting, and ensuring the height adjustment accuracy of the V-shaped clamp. At the same time, the auxiliary plate achieves smooth lifting and lowering through the cooperation of the lifting guide slide and the slide groove. The anti-detachment top plate and the limiting ring respectively form reliable limits for the auxiliary plate and the rotating ring. Compared with similar equipment, which is prone to problems such as lifting jamming and positioning offset, this design ensures the stability and consistency of the clamping components from the transmission coordination to the structural limit, effectively reducing the measurement error caused by positioning deviation and improving the accuracy of cylindricity measurement. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the positioning structure of the cylindricity measuring instrument described in this utility model;

[0016] Figure 2 This is a schematic diagram of the positioning circular plate in the positioning structure of the cylindricity measuring instrument described in this utility model;

[0017] Figure 3 This is a schematic diagram of the lifting groove frame in the positioning structure of the cylindricity measuring instrument described in this utility model;

[0018] Figure 4 This is a schematic diagram of the V-shaped clamping block in the positioning structure of the cylindricity measuring instrument described in this utility model;

[0019] Figure 5 This is a schematic diagram of the auxiliary vertical plate in the positioning structure of the cylindricity measuring instrument described in this utility model;

[0020] Figure 6This is a schematic diagram of the rotating ring in the positioning structure of the cylindricity measuring instrument described in this utility model.

[0021] In the diagram: 1. Mounting base; 101. Mounting ring; 2. Positioning circular plate; 201. Lifting guide slide; 202. Rotating ring; 203. Limiting ring; 204. Support frame block; 3. Main upright plate; 301. Lifting slot frame; 302. Servo motor one; 303. Rotating screw one; 304. Servo motor two; 305. Rotating screw two; 306. Lifting slider; 307. Screw hole; 308. Hydraulic telescopic rod; 309. V-shaped clamp; 4. Secondary upright plate one; 401. Lifting guide slide bar; 402. Anti-detachment top plate; 5. Secondary upright plate two. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The embodiments of this utility model will be described below based on its overall structure.

[0024] Reference Figures 1 to 6In this embodiment of the utility model, a positioning structure for a cylindricity measuring instrument includes: a mounting base 1, a positioning circular plate 2 fixedly connected to the top surface of the mounting base 1, main upright plates 3 symmetrically fixedly connected to both ends of the top surface of the positioning circular plate 2, a lifting groove frame 301 connected through the outer side of the main upright plate 3, a servo motor 302 and a servo motor 304 symmetrically fixedly connected to the top of the lifting groove frame 301, a rotating screw 303 and a rotating screw 305 respectively provided at the output ends of the servo motor 302 and the servo motor 304, the same set of lifting sliders 306 being screwed and sleeved on the outer side of the rotating screws 303 and the rotating screws 305, a hydraulic telescopic rod 308 fixedly passing through the inside of the lifting slider 306, a V-shaped clamping block 309 fixedly connected to the end face of the hydraulic telescopic rod 308, and a secondary upright plate 4 and a secondary upright plate 5 symmetrically slidably connected to the other two ends of the top surface of the positioning circular plate 2.

[0025] Reference Figure 3 and Figure 4 Both rotating screw 1 303 and rotating screw 2 305 pass through the top of the lifting slot frame 301 and are located inside the lifting slot frame 301. The lifting slider 306 has two sets of screw holes 307 symmetrically opened at both ends, and the specifications of the screw holes 307 are compatible with the specifications of rotating screw 1 303 and rotating screw 2 305.

[0026] The above scheme is adopted: Rotating screw 1 303 and rotating screw 2 305 extend from the top of the lifting slot frame 301 to the inside, forming a stable transmission path. The screw holes 307 at both ends of the lifting slider 306 not only match the two screws in terms of thread specifications, but also their hole diameter, pitch and other parameters are precisely corresponding, ensuring a tight fit between the screws and the screw holes. The advantage of this design is that when servo motor 1 302 and servo motor 2 304 drive the two screws to rotate synchronously, the lifting slider 306 can rise and fall smoothly and vertically within the lifting slot frame 301, avoiding shaking or tilting caused by excessive fit clearance, thereby ensuring the accuracy of the V-shaped clamp 309 during height adjustment, laying the foundation for the precise clamping of subsequent workpieces.

[0027] Reference Figures 3 to 6 The main upright plate 3, the secondary upright plate 1 4 and the secondary upright plate 2 5 are each provided in two sets, and are arranged in a circular distribution on the top surface of the positioning circular plate 2. The secondary upright plate 1 4 and the secondary upright plate 2 5 are provided with the same number and specifications as the main upright plate 3, including the lifting slot frame 301, the servo motor 1 302, the rotating screw 1 303, the servo motor 2 304, the rotating screw 2 305, the lifting slider 306, the screw hole 307, the hydraulic telescopic rod 308 and the V-shaped clamping block 309 structure.

[0028] The above scheme employs a circumferential distribution of two sets of main upright plate 3, secondary upright plate 4, and secondary upright plate 5, which are arranged in a one-to-one correspondence. This creates a symmetrical clamping layout on the top surface of the positioning circular plate 2, enabling the fixation of various cylindrical workpieces of different diameters from multiple directions. The secondary upright plate 4 and secondary upright plate 5 are equipped with lifting and clamping components identical to those of the main upright plate 3, ensuring consistency in adjustment and clamping functions among the upright plates. The advantage of this structural design is that the adjustment accuracy and clamping force remain uniform regardless of the direction from which the workpiece is clamped. This effectively avoids workpiece positioning deviations caused by differences in the performance of different upright plate components, greatly improving the stability and accuracy of workpiece positioning during cylindricity measurement. It also enhances the equipment's adaptability to cylindrical workpieces of different sizes and shapes.

[0029] Reference Figure 1 , Figure 2 and Figure 6 The positioning circular plate 2 has a corresponding lifting guide groove 201 through which the sub-upper plate 4 and the sub-upper plate 5 are provided. The sub-upper plate 4 and the sub-upper plate 2 are symmetrically fixed with lifting guide strips 401 on both sides. The combined specifications of the horizontal cross section of the sub-upper plate 4 and the sub-upper plate 2 and the cross section of the lifting guide strips 401 at both ends are adapted to the specifications of the lifting guide groove 201 so that the two sets of sub-upper plates 4 and the sub-upper plate 2 can be lowered for storage when not in use.

[0030] The above solution is adopted: the opening position of the lifting guide groove 201 on the positioning circular plate 2 precisely corresponds to the installation position of the auxiliary upright plate 4 and the auxiliary upright plate 5. The dimensional parameters such as the width and depth of its groove are completely matched with the overall specifications of the auxiliary upright plate itself and the cross-section of the lifting guide strips 401 on both sides. This means that during the lifting process of the auxiliary upright plate, the lifting guide strips 401 can slide smoothly along the inner wall of the lifting guide groove 201, forming effective guidance and limiting. The advantage of this structure is that when the auxiliary upright plate 4 and the auxiliary upright plate 5 are idle, they can be lowered and stored in the positioning circular plate 2, which significantly reduces the space occupation rate of the equipment and makes the operating table cleaner. At the same time, the guide structure ensures the stability of the lifting process of the auxiliary upright plate, avoids jamming or deviation, and ensures that the auxiliary upright plate can be quickly and accurately raised to the working position when needed.

[0031] Reference Figure 2 and Figure 5 Both sets of auxiliary vertical plates 4 and 5 are fixed with anti-detachment top plates 402. The anti-detachment top plates 402 are larger than the lifting guide slide 201 to prevent the auxiliary vertical plates 4 and 5 from completely slipping out of the positioning circular plate 2.

[0032] The above solution involves fixing the anti-detachment top plate 402 to the top surface of the auxiliary upright plate 4 and the auxiliary upright plate 5. Its planar dimensions are larger than the groove size of the lifting guide slide 201. When the auxiliary upright plate is retracted downwards, the anti-detachment top plate 402 will gradually approach the top surface of the positioning circular plate 2 as the auxiliary upright plate descends. When the auxiliary upright plate descends to a certain extent, the anti-detachment top plate 402 will contact the top surface of the positioning circular plate 2, thereby preventing the auxiliary upright plate from continuing to descend. The main advantage of this structure is that it effectively limits the movement of auxiliary upright plate 4 and the auxiliary upright plate 5, preventing them from completely slipping off the positioning circular plate 2 during the lifting operation. This avoids the loss or damage of parts, ensuring the integrity of the equipment structure and the safety of use. It also simplifies the lifting control logic of the auxiliary upright plate.

[0033] Reference Figure 6 A rotating ring 202 is movably fitted on the outside of the mounting base 1, close to the bottom surface of the positioning circular plate 2. A support frame block 204 structure is fixedly connected to the outside of the rotating ring 202 at the corresponding positions of the two sets of auxiliary upright plates 4 and 5, so that the two sets of auxiliary upright plates 4 and 5 are level with the main upright plate 3 when they are put into use. A limiting ring 203 structure is fixedly fitted on the outside of the mounting base 1, close to the bottom surface of the rotating ring 202, to limit the state of the rotating ring 202.

[0034] The above scheme is adopted: the rotating ring 202 is rotatably sleeved on the outside of the mounting base 1, and its top surface is tightly fitted with the bottom surface of the positioning circular plate 2, ensuring stability during rotation. The position of the support frame block 204 on the outside of the rotating ring 202 corresponds one-to-one with the secondary upright plate 4 and the secondary upright plate 5. When the secondary upright plate is raised and put into use, the support frame block 204 can support the secondary upright plate from below. The limiting ring 203 is fixedly sleeved on the outside of the mounting base 1 and tightly fitted with the bottom surface of the rotating ring 202, which can limit the rotation of the ring 202. 02. Regarding the axial displacement, the advantage of this structure is that the supporting role of the frame block 204 ensures that the auxiliary upright plate 1 4 and auxiliary upright plate 2 5 maintain the same horizontal height as the main upright plate 3 during use, avoiding positioning deviation caused by the sinking of the auxiliary upright plate under force. The rotatability of the rotating ring 202 makes it convenient to adjust the supporting angle of the frame block 204 according to the position of the auxiliary upright plate. The limiting ring 203 ensures that the rotating ring 202 will not move axially during operation, further improving the overall stability of the equipment.

[0035] Reference Figure 1 A mounting ring 101 is fixedly sleeved on the outer side of the bottom end of the mounting base 1. Several sets of fixing bolts are evenly inserted into the mounting ring 101 in the radial direction so as to stably install the entire equipment on the operating table of the cylindricity measuring instrument.

[0036] The above scheme is adopted: the mounting ring 101 is fixedly connected to the outer side of the bottom end of the mounting base 1 to form an outwardly extending ring structure. The multiple sets of fixing bolt holes evenly distributed in the radial direction can be adapted to fixing bolts of different specifications. When the equipment is installed, the mounting ring 101 can be tightly connected to the operating table of the cylindricity measuring instrument by screwing the fixing bolts into these bolt holes.

[0037] The working principle of this utility model is as follows: First, the equipment is fixed as a whole by the mounting ring 101 at the bottom of the mounting base 1. The fixing bolts evenly distributed in the radial direction of the mounting ring 101 firmly install the equipment on the operating table of the cylindricity measuring instrument, providing a stable foundation for subsequent positioning work and avoiding errors caused by equipment shaking during the measurement process.

[0038] During positioning, the main upright plate 3, the first auxiliary upright plate 4, and the second auxiliary upright plate 5 form a multi-directional clamping system. Each of the three sets of upright plates has two sets, symmetrically distributed around the circumference. The main upright plate 3 is fixed to the top surface of the positioning circular plate 2. The first auxiliary upright plate 4 and the second auxiliary upright plate 5 are slidably connected to the lifting guide groove 201 of the positioning circular plate 2 via lifting guide slides 401. The number of plates used can be flexibly selected according to the workpiece size. When it is necessary to clamp workpieces with two different diameters, the first auxiliary upright plate 4 and the second auxiliary upright plate 5 are raised. The rotating ring 202 on the outside of the mounting base 1 can be rotated and adjusted so that the support frame block 204 fixed thereon is aligned with the bottom of the sub-upper plate. With the help of the limiting ring 203, the rotating ring 202 is axially limited to ensure that the sub-upper plate and the main plate 3 maintain the same level, ensuring clamping balance. The idle sub-upper plate can be lowered and stored in the positioning circular plate 2 to reduce space occupation. In addition, the anti-detachment top plate 402 is larger than the lifting guide slide 201, which can prevent the sub-upper plate from completely detaching and ensure structural integrity.

[0039] The lifting and clamping actions of each vertical plate are precisely realized through internal components. The rotating screw 303 and rotating screw 305 in the lifting slot frame 301 are synchronously driven by servo motor 302 and servo motor 304. The lifting slider 306 is vertically lifted and lowered along the screw through the screw holes 307 at both ends that are adapted to the screw specifications, ensuring the stability and accuracy of the height adjustment of the V-shaped clamp 309. When the lifting slider 306 reaches the appropriate height, the hydraulic telescopic rod 308 extends and pushes the V-shaped clamp 309 closer to the workpiece. The V-shaped clamps of multiple vertical plates work together from different directions, using the self-centering characteristics of the V-shaped structure to tightly clamp the cylindrical workpiece, avoid workpiece offset, and ensure that the workpiece axis is consistent with the measurement reference during measurement.

[0040] Throughout the process, the structural design of each component plays a crucial role. The precise fit between the screw and the screw hole ensures lifting accuracy, the symmetrical distribution of the vertical plates enhances clamping stability and adapts to various cylindrical workpieces of different diameters. For cylindrical workpieces with eccentric structures, it can also quickly respond to switch clamping operations. The retractable auxiliary vertical plate enhances the adaptability of the equipment, and the support frame block and limiting ring ensure the horizontality and stability of the structure. Ultimately, it achieves efficient and accurate positioning of cylindrical workpieces of different sizes and shapes, providing a reliable foundation for cylindricity measurement.

[0041] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A positioning structure for a cylindricity measuring instrument, comprising: The mounting base (1) is characterized in that a positioning circular plate (2) is fixedly connected to the top surface of the mounting base (1), and a main upright plate (3) is symmetrically fixedly connected to both ends of the top surface of the positioning circular plate (2). A lifting slot frame (301) is connected through the outer side of the main upright plate (3). A servo motor one (302) and a servo motor two (304) are symmetrically fixedly connected to the top of the lifting slot frame (301). Rotating screws are respectively provided at the output ends of the servo motor one (302) and the servo motor two (304). Rod 1 (303) and rotating screw 2 (305) are screwed together on the outside of the rotating screw 1 (303) and rotating screw 2 (305) with the same set of lifting sliders (306). A hydraulic telescopic rod (308) is fixedly inserted inside the lifting slider (306). A V-shaped clamp (309) is fixedly connected to the end face of the hydraulic telescopic rod (308). The other two ends of the top surface of the positioning circular plate (2) are symmetrically slidably connected to the auxiliary vertical plate 1 (4) and the auxiliary vertical plate 2 (5).

2. The positioning structure of the cylindricity measuring instrument according to claim 1, characterized in that, Both the first rotating screw (303) and the second rotating screw (305) pass through the top of the lifting slot frame (301) and are located inside the lifting slot frame (301). The lifting slider (306) has two sets of screw holes (307) symmetrically opened at both ends, and the screw holes (307) are adapted to the first rotating screw (303) and the second rotating screw (305).

3. The positioning structure of the cylindricity measuring instrument according to claim 2, characterized in that, The main upright plate (3), the first auxiliary upright plate (4) and the second auxiliary upright plate (5) are each provided in two sets, and are arranged in a circular distribution on the top surface of the positioning circular plate (2). The first auxiliary upright plate (4) and the second auxiliary upright plate (5) are provided with the same number and specifications as the main upright plate (3) of lifting slot frame (301), servo motor one (302), rotating screw one (303), servo motor two (304), rotating screw two (305), lifting slider (306), screw hole (307), hydraulic telescopic rod (308) and V-shaped clamp (309).

4. The positioning structure of the cylindricity measuring instrument according to claim 1, characterized in that, The positioning circular plate (2) has a corresponding lifting guide groove (201) through which the sub-upper plate one (4) and sub-upper plate two (5) are provided. The sub-upper plate one (4) and sub-upper plate two (5) are symmetrically fixed with lifting guide strips (401) on both sides. The combination specifications of the horizontal cross section of the sub-upper plate one (4) and sub-upper plate two (5) and the cross section of the lifting guide strips (401) at both ends are adapted to the lifting guide groove (201) so that the two sets of sub-upper plate one (4) and sub-upper plate two (5) can be lowered for storage when idle.

5. The positioning structure of a cylindricity measuring instrument according to claim 4, characterized in that, Both sets of auxiliary upright plate one (4) and auxiliary upright plate two (5) are fixed with anti-detachment top plate (402). The anti-detachment top plate (402) is larger than the lifting guide slide (201) to prevent auxiliary upright plate one (4) and auxiliary upright plate two (5) from completely sliding out of the positioning circular plate (2).

6. The positioning structure of a cylindricity measuring instrument according to claim 1, characterized in that, A rotating ring (202) is movably fitted on the outside of the mounting base (1) against the bottom surface of the positioning circular plate (2). A support frame block (204) is fixedly connected to the outside of the rotating ring (202) at the corresponding positions of the two sets of auxiliary upright plates (4) and the two sets of auxiliary upright plates (5) to ensure that the two sets of auxiliary upright plates (4) and the two sets of auxiliary upright plates (5) are in uniform horizontality with the main upright plate (3) when they are put into use. A limiting ring (203) is fixedly fitted on the outside of the mounting base (1) against the bottom surface of the rotating ring (202) to limit the state of the rotating ring (202).

7. The positioning structure of a cylindricity measuring instrument according to claim 1, characterized in that, The mounting base (1) is fixedly fitted with a mounting ring (101) on the outer side of its bottom end. The mounting ring (101) is evenly fitted with several sets of fixing bolts along the radial direction so as to stably install the entire device on the operating table of the cylindricity measuring instrument.

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