Concentricity detection device for circular worktable

Abstract

The utility model belongs to equipment detection technical field relates to a concentricity detection device of circular workbench, including universal magnetic force table seat, dial gauge and reference plate, the bottom surface of reference plate one end is provided with two first limit rods, its other end is provided with the second limit rod of slidable, is provided with the fastener for locking second limit rod on reference plate, the interval between second limit rod and two first limit rods is equal, and three limit rods form the limit clamp for clamping the inner ring of circular workbench on the bottom surface of reference plate, so that reference plate can rotate around the central axis on the top surface of inner ring. The detection device can drive dial gauge to rotate by reference plate, reads the dial gauge reading at different point positions to obtain the radial runout value of the outer ring of circular workbench, and whether the concentricity of outer ring and inner ring is qualified based on the radial runout value, the dial gauge has smaller graduation value, can improve the concentricity detection precision of outer ring and inner ring.

Description

Technical Field

[0001] This utility model belongs to the field of equipment testing technology, specifically relating to a device for detecting the concentricity of a circular workbench. Background Technology

[0002] In routine equipment maintenance, it's common to encounter situations where circular worktables require partial disassembly due to wear or damage to components. The damaged parts are removed, the repaired parts are reassembled, and then the circular worktable is reassembled. After disassembly, due to long-term wear and tear and component replacement, the outer contour of the circular worktable may become misaligned with the circular components. If this misalignment issue is not addressed during reassembly, it can cause additional wear during rotation or lead to an angle between the worktable surface and the horizontal plane, resulting in irreparable shape errors in the machined parts. However, in actual work, the detection of the concentricity of multiple rings of a circular worktable has always been a troublesome and difficult problem to be accurate. Especially in recent years, the company has introduced a large number of high-precision CNC equipment (such as the HOFLER4000 CNC gear grinding machine), which has made the requirements for the various precision dimensions of the machine tools more stringent. The traditional diameter measurement comparison method is complicated to operate, has large errors (for example, the scale division of traditional measuring tools is too large to meet the high precision requirements), and takes a long time. It can no longer meet the high-precision detection requirements of the concentricity of multiple rings of a circular worktable during the assembly and restoration of a circular worktable in the maintenance and inspection process of high-precision CNC equipment. Utility Model Content

[0003] To address the shortcomings of existing technologies, this utility model proposes a concentricity detection device for a circular worktable, thereby resolving the deficiencies of existing detection devices and methods for multi-ring concentricity of a circular worktable as described in the background section.

[0004] This utility model is achieved through the following technical solution: A concentricity testing device for a circular worktable includes a reference plate, a universal magnetic base, and a dial indicator mounted thereon. The dial indicator measures the radial runout of the outer ring of the circular worktable, and the concentricity between the outer and inner rings can be evaluated based on the radial runout value. The universal magnetic base is magnetically fixed to the top surface of the reference plate, which serves as its mounting base. Two first limiting rods are provided on the bottom surface of one end of the reference plate, and a slidable second limiting rod is provided on the other end. Fasteners for locking the second limiting rod are provided on the reference plate. The first and second limiting rods are both cylindrical rods, and the three limiting rods are distributed in an isosceles triangle. The central axis of the second limiting rod is perpendicular to the two first limiting rods. The distance between the central axes of the positioning rods is equal. The second limiting rod and the two first limiting rods form a limiting fixture on the bottom surface of the reference plate to hold the inner ring of the circular worktable. The limiting fixture slides with the inner ring, allowing the reference plate to rotate around the central axis of the inner ring on the top surface of the inner ring. This provides a moving base for the dial indicator and the universal magnetic gauge base, enabling them to rotate around the central axis of the inner ring with the reference plate. After the reference plate is installed on the top surface of the inner ring, the two first limiting rods are respectively pressed against the inner side wall of the inner ring. By sliding and adjusting the second limiting rod, the second limiting rod can be pressed against the outer side wall of the inner ring. After locking the second limiting rod with fasteners, the reference plate is limited to the top surface of the inner ring, preventing the reference plate from sliding radially on the top surface of the inner ring.

[0005] Furthermore, the fastener includes a first screw, a first slotted hole is provided on the reference plate, the threaded end of the first screw passes through the first slotted hole and is threadedly connected to the top end of the second limiting rod, the outer diameter of the second limiting rod is larger than the width of the first slotted hole, tightening the first screw can fix the second limiting rod on the reference plate, and loosening the first screw can slide along the length direction of the first slotted hole to adjust the distance between the second limiting rod and the two first limiting rods, so that the limiting fixture can adapt to the inner ring thickness of different circular worktables.

[0006] Furthermore, the fastener includes an adjusting plate and a second screw. One end of the adjusting plate has a second slotted hole, and the base plate has two blind holes. The inner wall of each blind hole has an internal thread for connecting the second screw. The adjusting plate is located on the top surface of the base plate. The threaded ends of the two second screws pass through the second slotted hole and are threaded into the two blind holes. The top end of the second limiting rod is fixed to the bottom surface of the other end of the adjusting plate. Tightening the two second screws can fix the adjusting plate to the top surface of the base plate. After loosening the two second screws, the adjusting plate can slide on the top surface of the base plate to adjust the distance between the second limiting rod and the two first limiting rods, so that the limiting fixture can adapt to the inner ring thickness of different circular worktables.

[0007] Furthermore, the fastener also includes a first screw, and a first through hole is provided at the end of the adjusting plate away from the second waist hole. The threaded end of the first screw passes through the first through hole and is threadedly connected to the top end of the second limiting rod. The outer diameter of the second limiting rod is larger than the inner diameter of the first through hole. When the first screw is tightened, the second limiting rod can be fixed on the adjusting plate, so that the second limiting rod can be installed and removed from the adjusting plate.

[0008] Furthermore, both of the first limiting rods are detachably connected to the base plate via third screws, and the first limiting rods are detachable from the base plate.

[0009] Furthermore, each of the first and second limiting rods is rotatably connected to a roller at its bottom. The rolling friction between the outer wall of the roller and the side wall of the inner ring replaces the sliding friction between the limiting rod and the side wall of the inner ring, which can reduce friction and reduce wear on the inner ring.

[0010] Furthermore, the operating steps for the above-mentioned testing device to detect the concentricity between the outer and inner rings of the circular worktable are as follows: S1. Install the reference plate on the inner ring of the circular worktable: After loosening the fasteners, slide the second limit rod to adjust the distance between it and the two first limit rods. Place the reference plate (with the universal magnetic base removed) on the top surface of the inner ring of the circular worktable, ensuring it is completely flush with the top surface of the inner ring. Ensure sufficient distance between the second limit rod and the two first limit rods to secure the limiting clamp onto the inner ring. Ensure the outer walls of the two first limit rods at one end of the reference plate are flush against the inner or outer wall of the inner ring. Slide the second limit rod to ensure its outer wall is flush against the inner ring. The outer or inner sidewall, and the first limiting rod and the second limiting rod are located on opposite sides of the inner and outer rings. After locking the fastener, the second limiting rod is locked, thereby locking the distance between the second limiting rod and the two first limiting rods. The second limiting rod and the two first limiting rods form a limiting clamp on the bottom surface of the reference plate for clamping the inner ring of the circular worktable. The limiting clamp forms a radial limiting effect on the inner ring. The reference plate can rotate around the central axis of the inner ring on the top surface of the inner ring, thereby providing a moving base for the dial indicator and the universal magnetic base, so that they can rotate around the central axis of the inner ring with the reference plate. S2. Install a dial indicator on the reference plate: The dial indicator is installed on a universal magnetic base, which is magnetically fixed to the top surface of the reference plate. Adjust the universal magnetic base so that the pointer of the dial indicator contacts the inner wall of the outer ring of the circular worktable. S3. Rotate the dial indicator for testing: Under the limiting action of the limit fixture, manually push the reference plate to rotate around the central axis of the inner ring on the top surface of the inner ring of the circular worktable. The dial indicator rotates synchronously with the reference plate. Read the dial indicator readings at different points to obtain the radial runout value of the outer ring of the circular worktable. Based on the radial runout value, the concentricity of the outer ring and the inner ring can be evaluated to determine whether it is qualified.

[0011] As can be seen from the above technical solution, the concentricity detection device for a circular worktable provided by this utility model has the following advantages: This testing device, installed on a circular worktable, is used to detect the concentricity of the outer and inner rings. It solves the problems of low accuracy and complex operation associated with traditional measurement methods, providing efficient and accurate detection of the concentricity of the circular worktable. It is particularly suitable for the maintenance and testing of high-precision CNC equipment. After the inner ring of the circular worktable is installed in place, it serves as a reference. A reference plate can be placed on the top surface of the inner ring, ensuring its bottom surface is completely flush with the top surface. The outer walls of both first limit rods are tightly against the inner or outer wall of the inner ring. The sliding adjustment... The two limiting rods ensure that the outer sidewall is pressed tightly against the outer or inner sidewall of the inner ring. The first and second limiting rods are located on opposite sides of the inner ring. After locking the fasteners, the second limiting rod is locked, thus locking the distance between the second limiting rod and the two first limiting rods. The second limiting rod and the two first limiting rods form a limiting fixture on the bottom surface of the reference plate for clamping the inner ring of the circular worktable. The limiting fixture provides radial limiting on the inner ring. The reference plate can rotate around the central axis of the inner ring on its top surface, thus serving as a dial indicator. The universal magnetic base provides a base for movement, allowing the dial indicator to rotate around the central axis of the inner ring along with the reference plate. The dial indicator is mounted on the reference plate via the universal magnetic base, and its pointer can be brought into contact with the inner wall of the outer ring of the circular worktable. Under the limiting action of the limit clamp, the reference plate is manually pushed to rotate around the central axis of the inner ring on the top surface of the inner ring of the circular worktable. The dial indicator rotates synchronously with the reference plate, allowing the dial of the dial indicator to rotate around the central axis of the inner ring while maintaining a constant center distance. The radial runout value of the outer ring of the circular worktable is obtained by reading the dial indicator at different points. Based on the radial runout value, the concentricity of the outer and inner rings can be evaluated. Compared with the traditional diameter measurement comparison method, which is complicated to operate, has large errors, and takes a long time, this testing device utilizes the dial indicator and its testing principle. Compared with the graduation value of traditional measuring tools, the dial indicator has a smaller graduation value (resolution), which can improve the detection accuracy of the concentricity of the outer and inner rings when assembling and restoring the circular worktable during the maintenance and testing of high-precision CNC equipment. Attached Figure Description

[0012] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0013] Figure 1 This is a three-dimensional structural diagram of Embodiment 1 of the present utility model.

[0014] Figure 2 This is an exploded structural diagram of Embodiment 1 of the present invention.

[0015] Figure 3 This is a three-dimensional structural diagram of Embodiment 2 of the present invention.

[0016] Figure 4 This is an exploded structural diagram of Embodiment 2 of the present invention.

[0017] Figure 5 This is a schematic diagram of the usage state structure of Embodiment 2 of this utility model.

[0018] Figure 6 This is a three-dimensional structural diagram of Embodiment 3 of the present invention.

[0019] The components in the diagram are named as follows: 1. Universal magnetic base; 2. Dial indicator; 3. Reference plate; 3.1. First oblique hole; 3.2. Second through hole; 3.3. Blind hole; 4. First limit rod; 5. Second limit rod; 6. Fastener; 6.1. First screw; 6.2. Adjusting plate; 6.2.1. Second oblique hole; 6.2.2. First through hole; 6.3. Second screw; 7. Third screw; 8. Inner ring; 9. Outer ring; 10. Roller. Detailed Implementation

[0020] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0021] In the description of this application, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship 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.

[0022] Example 1 A concentricity detection device for a circular worktable, such as Figure 1 and Figure 2 As shown, it mainly consists of a universal magnetic base 1, a dial indicator 2, a reference plate 3, a limit clamp, and fasteners 6.

[0023] The universal magnetic base 1, such as Figure 1 As shown, it is magnetically fixed to the top surface of the reference plate 3, serving as the mounting bracket for the dial indicator 2. It is widely used in machine tool processing and scientific research testing. It consists of a magnetic base and a universal arm. The core structure of the magnetic base is composed of an internal bar permanent magnet (or constant magnet) and an external soft magnetic material base. The magnet direction is adjusted by rotating the handle to achieve the adsorption or release function. It works by utilizing the rapid magnetization and demagnetization characteristics of the soft magnetic material and the strong magnetic field characteristics at both ends of the bar magnet. The dial indicator 2 is installed at the end of the universal arm away from the magnetic base. The spatial position of the dial indicator 2 can be adjusted by adjusting the extension and orientation of the universal arm. The universal magnetic base 1 is an existing product, such as the MG61003 model and the FISSO series.

[0024] The dial indicator 2, as shown Figure 1 As shown, it is installed at the end of the universal magnetic base 1 away from the reference plate 3. The dial indicator 2 can be used to measure the radial runout of the outer ring 9 of the circular worktable. Based on the radial runout value, the concentricity of the outer ring 9 and the inner ring 8 can be evaluated. It belongs to existing products, such as the GIRODTAST 1453 type, MITUTOYO 513 series and PEACOCK D-5S, etc.

[0025] The reference plate 3, such as Figure 1 As shown, it serves as the mounting base for the universal magnetic meter holder 1. It is a plate-shaped structure made of metal material that can be magnetically attracted by the universal magnetic meter holder 1. The top and bottom surfaces of the reference plate 3 are both ground flat using a high-precision surface grinder to ensure flatness.

[0026] The limiting clamp, such as Figure 1 and Figure 2 As shown, the inner ring 8 of the reference plate 3 is set on the reference plate 3 to clamp the circular worktable and forms a track on the inner ring 8 for the reference plate 3 to rotate around the central axis of the inner ring 8. It is composed of a first limiting rod 4 and a second limiting rod 5, both of which are cylindrical rods made of metal material. Two first limiting rods 4 are provided, and the top ends of the two first limiting rods 4 are fixed to the bottom surface of one end of the reference plate 3 and are distributed in parallel at intervals. In this embodiment, the second limiting rod 5 is directly set on the bottom surface of the other end of the reference plate 3. Specifically, the reference plate 3 has a first waist hole 3.1, the fastener 6 includes a first screw 6.1, and the top of the second limiting rod 5 has an internal threaded hole. The threaded end of the first screw 6.1 passes through the first waist hole 3.1 and is threadedly connected to the top of the second limiting rod 5. The outer diameter of the second limiting rod 5 is larger than the width of the first waist hole 3.1. When the first screw 6.1 is tightened, its head clamps the reference plate 3 with the top of the second limiting rod 5, thereby fixing the second limiting rod 5 on the bottom surface of the reference plate 3. When the first screw 6.1 is loosened, the first waist hole 3.1 serves as a sliding track for the first screw 6.1, allowing the first screw 6.1 and the second limiting rod 5 to slide along the length direction of the first waist hole 3.1, thereby adjusting the distance between the second limiting rod 5 and the two first limiting rods 4, so that the limiting fixture can adapt to the thickness of the inner ring 8 of different circular worktables.

[0027] To achieve the disassembly and assembly of the first limit rod 4, such as Figure 1 and Figure 2 As shown, both first limiting rods 4 are detachably connected to the reference plate 3 by the third screw 7; Specifically, one end of the reference plate 3 has two second through holes 3.2 spaced apart, and the top of each first limiting rod 4 has an internal threaded hole. The threaded ends of the two third screws 7 pass through the two second through holes 3.2 and are threadedly connected to the tops of the two first limiting rods 4. The outer diameter of the first limiting rod 4 is larger than the inner diameter of the second through hole 3.2. When the third screw 7 is tightened, its head and the top of the first limiting rod 4 can clamp the reference plate 3, thereby fixing the first limiting rod 4 to the bottom surface of the reference plate 3.

[0028] In this embodiment 1, the detection device is used for the following method of detecting the concentricity of a circular worktable: S1. Install the reference plate 3 on the inner ring 8 of the circular worktable: After loosening the first screw 6.1, slide the second limiting rod 5 to adjust the distance between it and the two first limiting rods 4, ensuring that the distance is greater than the thickness of the inner ring 8. Place the reference plate 3 (with the universal magnetic base 1 removed) on the top surface of the inner ring 8 of the circular worktable, making it completely fit against the top surface of the inner ring 8. Move the reference plate 3 so that the outer walls of the two first limiting rods 4 at one end of the reference plate 3 are both close to the inner wall of the inner ring 8. Slide and adjust the second limiting rod 5 so that its outer wall is close to the outer wall of the inner ring 8 (the positions of the first limiting rod 4 and the second limiting rod 5 can also be adjusted). (Replace the first limiting rod 4 with the outer wall of the inner ring 8 and the second limiting rod 5 with the inner wall of the inner ring 8), tighten the first screw 6.1 and then lock the second limiting rod 5, thereby locking the distance between the second limiting rod 5 and the two first limiting rods 4. The second limiting rod 5 and the two first limiting rods 4 form a limiting clamp on the bottom surface of the reference plate 3 for clamping the inner ring 8 of the circular worktable. The limiting clamp forms a radial limiting effect on the inner ring 8. The reference plate 3 can rotate around the central axis of the inner ring 8 on the top surface of the inner ring 8, thereby providing a moving base for the dial indicator 2 and the universal magnetic base 1, so that they can rotate around the central axis of the inner ring 8 with the reference plate 3. S2. Install dial indicator 2 on reference plate 3: Dial indicator 2 is installed on universal magnetic base 1. Universal magnetic base 1 is magnetically fixed to the top surface of reference plate 3. Adjust universal magnetic base 1 so that the pointer of dial indicator 2 contacts the inner side wall of the outer ring 9 of the circular worktable. S3. Rotate dial indicator 2 for testing: Under the limiting action of the limit fixture, manually push the reference plate 3 to rotate around the central axis of the inner ring 8 on the top surface of the inner ring 8 of the circular worktable. The dial indicator 2 rotates synchronously with the reference plate 3. Read the readings of the dial indicator 2 at different points to obtain the radial runout value of the outer ring 9 of the circular worktable. Based on the radial runout value, the concentricity of the outer ring 9 and the inner ring 8 can be evaluated to see if it is qualified.

[0029] Example 2 A concentricity detection device for a circular worktable, differing from Embodiment 1 in that: Figure 3 and Figure 4 As shown, the second limiting rod 5 is installed on the reference plate 3 in a different way, and the fastener 6 has a different structure.

[0030] In this embodiment, as Figure 3 and Figure 4 As shown, the fastener 6 consists of a first screw 6.1, an adjusting plate 6.2, and two second screws 6.3; The adjusting plate 6.2 is a long strip-shaped structure made of metal material. Its top and bottom surfaces are ground flat using a high-precision surface grinder to ensure flatness. One end of the adjusting plate 6.2 has a second waist hole 6.2.1, and the other end has a first through hole 6.2.2. The reference plate 3 has two blind holes 3.3. The inner wall of each blind hole 3.3 has an internal thread for connecting the second screw 6.3. The top of the second limiting rod 5 has an internal threaded hole. The threaded end of the first screw 6.1 passes through the first through hole 6.2.2 and is threaded to the top of the second limiting rod 5. The outer diameter of the second limiting rod 5 is larger than the inner diameter of the first through hole 6.2.2. When the first screw 6.1 is tightened, its head clamps the adjusting plate 6.2 with the top of the second limiting rod 5, thereby fixing the second limiting rod 5 on the adjusting plate 6.2. The second limiting rod 5 is detachable. like Figure 3 As shown, the adjusting plate 6.2 is disposed on the top surface of the reference plate 3, and its bottom surface is completely in contact with the top surface of the reference plate 3. The threaded ends of the two second screws 6.3 respectively pass through the second waist hole 6.2.1 and are threaded into the two blind holes 3.3. When the two second screws 6.3 are tightened, their heads clamp the adjusting plate 6.2 with the reference plate 3, which can fix the adjusting plate 6.2 on the top surface of the reference plate 3. The two second screws 6.3 are set to prevent the adjusting plate 6.2 from rotating on the top surface of the reference plate 3, so as to ensure that the distance between the central axis of the second limiting rod 5 and the central axis of the two first limiting rods 4 is equal. After loosening the two second screws 6.3, the adjusting plate 6.2 can slide on the top surface of the reference plate 3 to adjust the distance between the second limiting rod 5 and the two first limiting rods 4, so that the limiting fixture can adapt to the inner ring 8 thickness of different circular worktables.

[0031] In this embodiment 2, as Figure 5 As shown, the detection device is installed on a circular worktable. The detection method for detecting the concentricity of the outer ring 9 and the inner ring 8 is as follows: Among them, the circular worktable is the world-class advanced CNC gear grinding machine HOFLER 4000 imported from Germany. This equipment has the advantages of high processing accuracy, wide processing range, high working efficiency and simple operation. This time, due to the damage of the torque motor of the circular worktable, it is necessary to replace the torque motor core. The core was manufactured and processed in Germany and transported to multiple countries, taking a year to arrive at the site. Because the concentricity requirements of the guide rails (inner ring 8 and outer ring 9) are extremely high during installation, the error of ordinary measurement methods is relatively large. S1. Install the reference plate 3 on the inner ring 8 of the circular worktable: After loosening the two second screws 6.3, slide the adjusting plate 6.2 on the top surface of the reference plate 3 to adjust the distance between the second limiting rod 5 and the two first limiting rods 4, ensuring that the distance is greater than the thickness of the inner ring 8. Place the reference plate 3 (with the universal magnetic base 1 removed) on the top surface of the inner ring 8 of the circular worktable, making it completely fit against the top surface of the inner ring 8. Move the reference plate 3 so that the outer walls of the two first limiting rods 4 at one end of the reference plate 3 are both close to the inner wall of the inner ring 8. Slide the adjusting plate 6.2 to adjust the second limiting rod 5 so that its outer wall is close to the outer wall of the inner ring 8 (the positions of the first limiting rod 4 and the second limiting rod 5 can also be interchanged). After tightening the two second screws 6.3, fix the adjusting plate 6.2 on the reference plate 3 to lock the position of the second limiting rod 5 and the distance between the second limiting rod 5 and the two first limiting rods 4. The second limiting rod 5 and the two first limiting rods 4 form a limiting clamp on the bottom surface of the reference plate 3 to hold the inner ring 8 of the circular worktable. The limiting clamp has a radial limiting effect on the inner ring 8. The reference plate 3 can rotate around the central axis of the inner ring 8 on the top surface of the inner ring 8, thereby providing a moving base for the dial indicator 2 and the universal magnetic base 1, so that they can rotate around the central axis of the inner ring 8 with the reference plate 3. S2. Install dial indicator 2 on reference plate 3: Dial indicator 2 is installed on universal magnetic base 1. Universal magnetic base 1 is magnetically fixed to the top surface of reference plate 3. Adjust universal magnetic base 1 so that the pointer of dial indicator 2 contacts the inner side wall of the outer ring 9 of the circular worktable. S3. Rotate dial indicator 2 for testing: Under the limiting action of the limit fixture, manually push the reference plate 3 to rotate around the central axis of the inner ring 8 on the top surface of the circular worktable. The dial indicator 2 rotates synchronously with the reference plate 3. The dial of the dial indicator 2 rotates around the central axis of the inner ring 8 while the center distance remains unchanged. The pointer jump causes the reading on the dial of the dial indicator 2 to change. Read the reading of the dial indicator 2 at different points to obtain the radial runout value of the outer ring 9 of the circular worktable. Based on the radial runout value, the concentricity of the outer ring 9 and the inner ring 8 can be evaluated.

[0032] The difference between the detection method in Example 2 and Example 1 is that: In Example 1, as Figure 1 As shown, when adjusting the distance between the second limiting rod 5 and the two first limiting rods 4, both loosening and tightening the first screw 6.1 require one hand to hold the second limiting rod 5 and the other hand to turn the first screw 6.1, in order to prevent the second limiting rod 5 and the first screw 6.1 from rotating synchronously and thus failing to loosen or tighten the first screw 6.1; In this embodiment 2, as Figure 3As shown, since the second limiting rod 5 has been fixed to the adjusting plate 6.2 in advance by the first screw 6.1, when adjusting the distance between the second limiting rod 5 and the two first limiting rods 4, the operation is carried out by loosening and tightening the two second screws 6.3, so that the second limiting rod 5 does not need to be fixed by hand, making the operation more convenient.

[0033] Example 3 A concentricity detection device for a circular worktable, differing from Embodiments 1 and 2 in that: Figure 6 As shown, each of the first limiting rods 4 and the second limiting rods 5 is rotatably connected to a roller 10 at its bottom. The rolling friction between the outer wall of the roller 10 and the side wall of the inner ring 8 replaces the sliding friction between the limiting rod and the side wall of the inner ring 8, which can reduce friction and reduce wear on the inner ring 8. Specifically, roller 10 is an existing product, such as the KIS bolt-type roller (cam follower bearing) product series, which can be threaded onto the bottom end of the limit rod.

Claims

1. A concentricity testing device for a circular workbench, comprising a universal magnetic base (1) and a dial indicator (2) mounted thereon, characterized in that: It also includes a reference plate (3), the universal magnetic base (1) is magnetically fixed to the top surface of the reference plate (3); two first limiting rods (4) are provided on the bottom surface of one end of the reference plate (3), and a slidable second limiting rod (5) is provided on the other end of the reference plate (3), and a fastener (6) is provided on the reference plate (3) to lock the second limiting rod (5) on it. The first limiting rod (4) and the second limiting rod (5) are both cylindrical rods, and the three limiting rods are distributed in an isosceles triangle. The distance between the central axis of the second limiting rod (5) and the central axis of the two first limiting rods (4) is equal. The second limiting rod (5) and the two first limiting rods (4) form a limiting fixture on the bottom surface of the reference plate (3) for clamping the inner ring (8) of the circular workbench, and the limiting fixture slides with the inner ring (8) to allow the reference plate (3) to rotate around the central axis of the inner ring (8) on the top surface of the inner ring (8).

2. The concentricity detection device for a circular worktable according to claim 1, characterized in that: The fastener (6) includes a first screw (6.1), a first waist hole (3.1) is provided on the reference plate (3), the threaded end of the first screw (6.1) passes through the first waist hole (3.1) and is threadedly connected to the top of the second limiting rod (5), and the outer diameter of the second limiting rod (5) is greater than the width of the first waist hole (3.1).

3. The concentricity detection device for a circular worktable according to claim 1, characterized in that: The fastener (6) includes an adjusting plate (6.2) and a second screw (6.3), and one end of the adjusting plate (6.2) has a second slotted hole. 6.2.1) Two blind holes (3.3) are provided on the base plate (3). The inner wall of each blind hole (3.3) is provided with an internal thread for connecting the second screw (6.3). The adjusting plate (6.2) is set on the top surface of the base plate (3). The threaded ends of the two second screws (6.3) pass through the second waist hole respectively. 6.2.1) The threaded connection is in the two blind holes (3.3), and the top of the second limiting rod (5) is fixed to the bottom surface of the other end of the adjusting plate (6.2).

4. The circular workbench concentricity detection device according to claim 3, characterized in that: the fastener (6) further includes a first screw (6.1), and the adjusting plate (6.2) is located away from the second waist hole ( 6.2.1) A first through hole (6.2.2) is provided at one end. The threaded end of the first screw (6.1) passes through the first through hole (6.2.2) and is threadedly connected to the top of the second limiting rod (5). The outer diameter of the second limiting rod (5) is greater than the inner diameter of the first through hole (6.2.2).

5. The concentricity detection device for a circular worktable according to claim 1, characterized in that: Both of the first limiting rods (4) are detachably connected to the base plate (3) by the third screw (7).

6. The concentricity detection device for a circular worktable according to claim 1, characterized in that: Each of the first limiting rod (4) and the second limiting rod (5) is rotatably connected to a roller (10) at its bottom.

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