A pneumatic clamping mechanism for the spindle of a roundness tester

Abstract

This utility model discloses a pneumatic clamping mechanism for the spindle of a roundness meter, comprising: a spindle capable of rotating around the Z-axis, with a disc connected to its lower end; a clamping assembly including a base plate and a clamping bracket, the base plate being located below the spindle, the clamping bracket including a connecting rod, a fixing member, and a fixing plate, the connecting rod being vertically mounted on the base plate, the fixing member being sleeved on the connecting rod and slidable along the connecting rod, and the end of the fixing plate being connected to the fixing member and located between the two connecting rods; and an even number of needle cylinders, with two needle cylinders forming a group and mounted on the fixing plate, the axes of the group of needle cylinders being perpendicular to and intersecting the axis of the spindle, and a clamping block being mounted on the output end of the needle cylinder, the needle cylinder being used to drive the clamping block to clamp the disc. This mechanism is easy to install, occupies little space, and can greatly reduce the equipment space occupied by the mechanism. Furthermore, the position of the needle cylinders in the Z-axis direction can be adjusted as needed to meet more installation conditions and usage requirements.

Description

Technical Field

[0001] This utility model relates to the field of measurement and testing, specifically to a pneumatic clamping mechanism for the spindle of a roundness meter. Background Technology

[0002] Existing roundness measuring instrument spindle locking methods are mainly divided into three categories: pneumatic locking, mechanical locking, and electromagnetic locking. Among them, pneumatic locking is the most advanced method and the mainstream choice for high-precision roundness measuring instruments. Due to its advantages such as uniform locking force, high precision, and high repeatability, pneumatic spindle locking has become the most mainstream spindle locking structure in high-end roundness measuring instruments. However, because it uses multiple cylinders for driving, the pneumatic clamping mechanism occupies a large space in the roundness measuring instrument, and its position cannot be adjusted after the installation location is determined, which requires improvement. Utility Model Content

[0003] One of the technical problems to be solved by this application is to overcome the defects of the above-mentioned related technologies and provide a pneumatic clamping mechanism for the spindle of a roundness tester. This pneumatic clamping mechanism for the spindle of a roundness tester is easy to install, occupies little space, and meets more installation conditions and usage needs.

[0004] The technical solution adopted by this utility model to solve the technical problem is: a pneumatic clamping mechanism for the spindle of a roundness meter, comprising: The spindle is capable of rotating around the Z-axis; A disc is mounted at the lower end of the main shaft and is coaxial with the main shaft; A clamping assembly includes a base plate and a clamping bracket. The spindle is located above the base plate, and the clamping bracket is mounted on the base plate. The clamping bracket includes a connecting rod, a fixing member, and a fixing plate. The connecting rod is vertically mounted on the base plate, the fixing member is mounted on the connecting rod and is height-adjustable, and the end of the fixing plate is connected to the fixing member and located between the two connecting rods. A needle-type cylinder is mounted on the fixed plate. There is an even number of needle-type cylinders, arranged in pairs and symmetrically mounted on both sides of the main shaft. The axes of each pair of needle-type cylinders are perpendicular to and intersect the axis of the main shaft. A clamping block is mounted on the output end of each needle-type cylinder, and the needle-type cylinder drives the clamping block to clamp the disc. This pneumatic clamping mechanism for the roundness tester spindle uses a symmetrical clamping assembly, enabling rapid locking of the spindle with high precision and repeatability.

[0005] Preferably, the output end of the needle cylinder is provided with a first threaded structure and a limiting block fixed to the first threaded structure. The first threaded structure is threadedly connected to the clamping block, and the limiting block is used to axially limit the clamping block. This threaded connection method facilitates the installation and removal of the clamping block. The limiting block on the first threaded structure can axially limit the clamping block and prevent the clamping block from loosening when clamping the disc.

[0006] Preferably, the needle cylinder has a second threaded structure on its cylinder body, and two nuts are connected to the second threaded structure. The fixing plate has a first mounting hole, and the needle cylinder is mounted in the first mounting hole and fixed by the two nuts. By adjusting the position of the nuts on the second threaded structure of the needle cylinder mounted on the fixing plate, the distance between the needle cylinder and the disc can be controlled, and the needle cylinder can be fixed in the first mounting hole by tightening the two nuts.

[0007] Preferably, the fixing plate includes a mounting portion, and both ends of the mounting portion are bent at 90° in the same direction to form a connecting portion, which is connected to the fixing member. The connection portion and the mounting portion are connected to form a U-shaped structure. The design of the U-shaped structure not only ensures the connection strength between the connecting portion and the fixing member, but also facilitates the alignment and fixing operations during assembly.

[0008] Preferably, the connecting part is mounted on the fixing member, and the mounting part is bent in the direction of the disc. This bending direction towards the disc provides sufficient space for the extension and retraction of the needle cylinder's output end, ensuring that the reciprocating motion of the cylinder piston rod is unimpeded.

[0009] Preferably, the fixing member is a cylindrical structure with an opening and several second mounting holes on its side wall. Bolts pass through the second mounting holes and the opening to clamp the connecting rod. When fixing is required, bolts can be passed through the second mounting holes and the opening, and the fixing member can be firmly clamped to the connecting rod by the tightening action of the bolts.

[0010] Preferably, the fastener has a mounting surface for mounting the connecting part. The design of the mounting surface effectively prevents loosening at the connection between the connecting part and the fastener, thus improving the stability of the overall structure.

[0011] Preferably, the connecting part is provided with a third mounting hole for fixing the fixing plate. The third mounting hole is strip-shaped and used to adjust the position of the fixing plate. After the bolt passes through the third mounting hole, it connects with the fixing member and installs the connecting part onto the fixing member. The design of the third mounting hole facilitates the adjustment of the positional relationship between the two connecting parts and the fixing member.

[0012] Preferably, the disk has a through hole in its center, and the edge of the through hole extends axially upward to form a support member. The lower end of the main shaft has a connecting shaft, which is mounted on the support member. The support member provides greater support for the object to be measured placed on the upper end of the main shaft.

[0013] Compared with related technologies, this utility model has the following advantages: 1. Simple installation and stable and reliable structure: This mechanism requires only a few parts to complete the installation and fixation, and its structure is simple, stable, and not easily deformed. 2. Small clamping mechanism and small space occupation: This mechanism uses a needle cylinder as the drive, and the installation method is simple and stable, requiring only a small space to complete the installation. 3. Symmetrical needle cylinder locking: This clamping assembly uses a symmetrical needle cylinder, combined with clamping blocks and discs, to achieve rapid locking of the spindle, with high precision and high repeatability. 4. Adjustable needle cylinder position: This clamping assembly uses four high-strength metal rods as support, and the position of the needle cylinder can be changed by adjusting the position of the fixing parts. It can be adjusted according to the spindle position and is suitable for various spindle structures. Attached Figure Description

[0014] Figure 1 This is a perspective view of the present invention; Figure 2 This is a structural schematic diagram of the fixing plate and needle cylinder of this utility model; Figure 3 This is a schematic diagram of the structure of the needle-type cylinder of this utility model; Figure 4 This is a structural schematic diagram of the fixing plate of this utility model; Figure 5 This is a structural schematic diagram of the fastener of this utility model; Figure 6 This is a schematic diagram of the main shaft and disc of this utility model.

[0015] Attached Figures: 1. Base plate; 2. Main shaft; 201. Connecting shaft; 3. Disc; 301. Support base; 4. Connecting rod; 5. Fixing component; 501. Opening; 502. Through hole; 503. Limiting surface; 6. Mounting part; 601. First mounting hole; 7. Connecting part; 701. Adjusting hole; 8. Clamping block; 9. Nut; 10. First thread structure; 11. Second thread structure; 12. Limiting block; 13. Needle cylinder. Detailed Implementation

[0016] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of this application and are not intended to limit the scope of protection of the embodiments of this application. Those skilled in the art can make adjustments as needed to adapt to specific application scenarios.

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0018] like Figures 1-6 As shown, a pneumatic clamping mechanism for the spindle of a roundness tester includes: Spindle 2 is capable of rotating around the Z-axis; The disc 3 is mounted on the lower end of the main shaft 2 and is coaxial with the main shaft 2; The clamping assembly includes a base plate 1 and a clamping bracket. The spindle 2 is located above the base plate 1. The clamping bracket is mounted on the base plate 1. The clamping bracket includes a connecting rod 4, a fixing member 5, and a fixing plate. The connecting rod 4 is vertically mounted on the base plate 1. The fixing member 5 is mounted on the connecting rod 4 and its height is adjustable. The end of the fixing plate is connected to the fixing member 5 and is located between the two connecting rods 4. A needle-type cylinder 13 is mounted on the fixed plate. The number of needle-type cylinders 13 is even. Two needle-type cylinders 13 are grouped together and symmetrically mounted on both sides of the main shaft 2. The axes of the group of needle-type cylinders 13 are perpendicular to and intersect the axis of the main shaft 2. A clamping block 8 is mounted on the output end of the needle-type cylinder 13. The needle-type cylinder 13 is used to drive the clamping block 8 to clamp the disc 3.

[0019] In this embodiment, the pneumatic clamping mechanism of the roundness tester spindle includes a spindle 2, a disc 3, and clamping components. The base plate 1 provides a stable mounting platform for the entire mechanism. The spindle 2 is vertically mounted above the base plate 1, with the disc 3 connected to its lower end. The spindle 2 is cylindrical in shape. Connected to the output shaft of a motor, the motor drives the spindle 2 to rotate around the Z-axis. A fixture for clamping the part to be measured is mounted on the upper end of the spindle 2. The fixture rotates synchronously with the spindle 2, thereby rotating the part to be measured. The mounting brackets adopt a symmetrical design, with two mounting brackets forming a group and symmetrically placed on both sides of the base plate 1. Each clamping component includes a connecting rod 4, a fixing member 5, and a fixing plate. The connecting rod 4 is cylindrical in shape, and its end is threadedly connected to the base plate 1 for reliable fixation. This threaded connection ensures that the four connecting rods 4 are at the same horizontal level, thus providing guiding support for the entire mounting bracket. The fixing piece 5 is sleeved on the connecting rod 4, enabling adjustment of the position of the fixing plate, thereby adjusting the height of the needle cylinder 13. The end of the fixing plate is connected to the fixing piece 5, and the middle part is used to install the cylinder. The fixing plate is used to fix the needle cylinder 13, connecting the cylinder, connecting rod 4, and fixing piece 5 in series, improving the linkage of the clamping mechanism. Through this symmetrical dual-component design, the pneumatic clamping mechanism of the roundness meter spindle 22 can not only achieve rapid response locking of the spindle 2, but also ensure high precision and high repeatability of the locking process, expanding the applicable scenarios of the pneumatic clamping mechanism of the roundness meter. A clamping block 8 is fixedly installed on the output end of the needle cylinder 13, and the clamping block 8 is wear-resistant. The needle cylinder 13, through the telescopic movement of its output end, controls the clamping action of the clamping block 8, thereby achieving reliable clamping of the disc 3. During equipment operation, the two symmetrical clamping blocks 8, through the telescopic movement of the output end of the needle cylinder 13, abut against the side wall of the disc 3 in the circumferential direction, reliably clamping the disc 3 at the same horizontal level, ensuring accurate measurement of the part to be measured during operation. This design not only improves clamping efficiency but also effectively prevents the disc 3 from shifting or loosening during operation.

[0020] Furthermore, the output end of the needle cylinder 13 is provided with a first threaded structure 10 and a limiting block 12 fixed on the first threaded structure 10. The first threaded structure 10 is threadedly connected to the clamping block 8, and the limiting block 12 is used to axially limit the clamping block 8.

[0021] In this embodiment, a first threaded structure 10 is provided on the output end of the needle cylinder 13, and a limiting block 12 is fixedly installed on the side of the first threaded structure 10 near the cylinder body of the needle cylinder 13. The first threaded structure 10 can cooperate with the thread of the inner hole of the clamping block 8 to realize the threaded connection between the two. The main function of the limiting block 12 is to axially limit the clamping block 8 and restrict the range of movement of the clamping block 8 along the thread axis. When the clamping block 8 clamps the disc 3, the disc 3 will exert a force on the clamping block 8 in the direction of the fixed plate, causing the clamping block 8 to slide in the direction of the fixed plate. The limiting block 12 is fixedly installed in the sliding direction of the clamping block 8 to prevent the clamping block 8 from sliding. Furthermore, the limiting block 12 can also be threadedly connected to the first threaded structure 10 through its internal threaded structure and fixed by bolts. The threaded connection between the clamping block 8 and the first threaded structure 10 has the characteristics of simple structure and convenient operation, which facilitates the quick installation of the clamping block 8 and the disassembly and maintenance when needed. The limiting block 12 on the first threaded structure 10 effectively constrains the axial displacement of the clamping block 8 through mechanical limiting, maintaining a stable locking force throughout the clamping process of the disc 3. This prevents the clamping block 8 from loosening due to vibration or uneven force, ensuring the reliability of clamping. The matching design between the limiting block 12 and the first threaded structure 10 ensures assembly accuracy and improves the durability of the entire mechanism.

[0022] Furthermore, the cylinder body of the needle cylinder 13 is provided with a second threaded structure 11, and the second threaded structure 11 is connected with a nut 9. There are two nuts 9. The fixing plate is provided with a first mounting hole 601. The needle cylinder 13 is installed in the first mounting hole 601 and fixed by the two nuts 9.

[0023] In this embodiment, the needle cylinder 13 has a second threaded structure 11 circumferentially arranged on the outer wall of the cylinder body. Two nuts 9 are mounted on this second threaded structure 11. The two nuts 9 cooperate and are tightened to reliably mount the needle cylinder 13 onto the fixed plate, preventing axial displacement of the needle cylinder 13 due to the force generated during clamping. Simultaneously, by rotating and adjusting the relative position of the two nuts 9 on the second threaded structure 11 of the needle cylinder 13 mounted on the fixed plate, the distance between the needle cylinder 13 and the disc 3 can be adjusted. The double-nut 9 locking structure forms a reliable anti-loosening mechanism, effectively resisting vibration and impact during equipment operation and preventing nut 9 loosening due to long-term use. Secondly, this installation method allows for fine-tuning of the needle cylinder 13's position, facilitating precise positioning according to actual working conditions. Finally, this structural design not only improves the assembly efficiency of the mechanism but also enhances the overall structural stability, ensuring stable performance during long-term operation and reducing the risk of failure due to needle cylinder 13 loosening.

[0024] Furthermore, the fixing plate includes a mounting part 6, and the two ends of the mounting part 6 are bent at 90° in the same direction to form a connecting part 7, which is connected to the fixing member 5.

[0025] In this embodiment, the fixing plate includes a mounting part 6, and both ends of the mounting part 6 are bent at 90° in the same direction to form symmetrical connecting parts 7. The connecting parts 7 are reliably connected to the fixing member 5 by bolts. The mounting part 6 and the connecting parts 7 at both ends form a U-shaped structure. The U-shaped structure facilitates quick alignment during assembly, greatly improving assembly efficiency. In addition, the U-shaped structure design also provides sufficient operating space, making the fixing and installation operation more convenient and faster.

[0026] Furthermore, the connecting part is mounted on the fixing member 5, and the mounting part 6 is bent in the direction of the disc 3.

[0027] In this embodiment, the opening 501 of the U-shaped structure is installed facing the disk 3. This U-shaped structure not only provides ample space for the output end of the needle cylinder 13, but also ensures that the output end of the needle cylinder 13 has sufficient stroke distance during reciprocating telescopic motion. Specifically, the orientation design of the opening 501 of the U-shaped structure effectively avoids motion interference that may occur during the operation of the needle cylinder 13, allowing the output end to complete telescopic motion smoothly and without obstruction. At the same time, this structural arrangement also optimizes the overall mechanical layout, making the fit between the needle cylinder 13 and the main shaft 2 more compact and reasonable, thereby improving the stability and reliability of the entire mechanism.

[0028] Furthermore, the fastener is a cylindrical structure, and the side wall of the cylindrical structure is provided with an opening 501 and a plurality of through holes 502 arranged in an array. Bolts pass through the through holes 502 to clamp the connecting rod 4.

[0029] In this embodiment, the fixing member 5 is provided with an opening 501 and a plurality of through holes 502 arranged in an array, which are evenly arranged on the fixing member 5. The opening 501 on the fixing member 5 is strip-shaped, and the design of the opening 501 is conducive to the fixing member 5 generating greater elastic deformation. When fixing is required, the bolt can be inserted from one side of the opening 501 on the fixing member 5 and pass through the opening 501, and then the nut 9 is tightened on the end of the bolt, thereby narrowing the opening 501 and clamping the connecting rod 4. This connection method facilitates the adjustment of the position of the fixing member 5 on the connecting rod 4, and also facilitates subsequent disassembly and maintenance operations.

[0030] Furthermore, the fastener 5 is provided with a mounting surface 503 for mounting the connecting part 7.

[0031] In this embodiment, the fastener 5 is provided with a mounting surface 503, which is a plane. The end of the fixing plate is reliably connected to the mounting surface 503 by bolts. The design of the mounting surface 503 ensures ease of installation, making the assembly process more efficient and smooth. Furthermore, its shape-matching structure with the connecting part 7 effectively prevents loosening at the connection between the fastener 5 and the fixing plate. This improves the stability of the connection between the connecting part 7 and the mounting surface 503. Simultaneously, the fit between the mounting surface 503 and the end of the fixing plate effectively disperses stress, avoiding localized stress concentration and further enhancing the reliability of the structure.

[0032] Furthermore, the connecting part 7 is provided with a third mounting hole 701 for fixing the fixing plate. The third mounting hole 701 has a strip-shaped structure and is used to adjust the position of the fixing plate. After the bolt passes through the third mounting hole 701, it is connected to the fixing member 5 and the connecting part 7 is installed on the fixing member 5.

[0033] In this embodiment, the connecting part 7 is provided with a third mounting hole 701, which is an elliptical hole structure. After the bolt passes through the third mounting hole 701, it connects with the fixing member 5, achieving a secure connection. The third mounting hole 701, with its strip-shaped hole structure, not only facilitates adjustment of the specific position of the connecting part 7 on the fixing member 5, making the installation process more flexible and convenient, but also greatly improves the symmetry of the installation of the two connecting parts 7, thereby further enhancing the reliability of the mounting bracket connection.

[0034] Furthermore, the disk 3 has a through hole 502 in the middle, and the edge of the through hole 502 extends axially upward to form a support member 301. The lower end of the main shaft 2 has a connecting shaft 201, and the connecting shaft 201 is mounted on the support member 301.

[0035] In this embodiment, a through hole 502 is provided at the center of the disk 3, and the through hole 502 extends upward along the axial direction to form a cylindrical support member 301. The main shaft 2 is provided with a connecting shaft 201, which can cooperate with the support member 301 to vertically mount the main shaft 2 on the disk 3. This structural design of the central protrusion of the disk 3 allows the support base 301 to not only provide a stable support platform for the object to be measured placed on the upper end of the main shaft 2, but more importantly, it significantly improves the overall load-bearing capacity by increasing the contact area and optimizing the force distribution, thereby providing a more reliable and powerful support for the object to be measured.

[0036] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A pneumatic clamping mechanism for the spindle of a roundness tester, characterized in that, include: The spindle is capable of rotating around the Z-axis; A disc is mounted at the lower end of the main shaft and is coaxial with the main shaft; A clamping assembly includes a base plate and a clamping bracket. The base plate is located below the spindle, and the clamping bracket is mounted on the base plate. The clamping bracket includes a connecting rod, a fixing member, and a fixing plate. The connecting rod is vertically mounted on the base plate, the fixing member is mounted on the connecting rod and is height-adjustable, and the end of the fixing plate is connected to the fixing member and located between the two connecting rods. A needle-type cylinder is mounted on the fixed plate. The number of needle-type cylinders is even. Two needle-type cylinders are grouped together and symmetrically mounted on both sides of the main shaft. The axes of a group of needle-type cylinders are perpendicular to and intersect the axis of the main shaft. A clamping block is mounted on the output end of the needle-type cylinder. The needle-type cylinder is used to drive the clamping block to clamp the disc.

2. The pneumatic clamping mechanism for the spindle of a roundness tester according to claim 1, characterized in that, The output end of the needle cylinder is provided with a first threaded structure and a limiting block fixed on the first threaded structure. The first threaded structure is threadedly connected to the clamping block, and the limiting block is used to axially limit the clamping block.

3. The pneumatic clamping mechanism for the spindle of a roundness tester according to claim 1, characterized in that, The cylinder body of the needle cylinder is provided with a second thread structure, and two nuts are connected to the second thread structure. The fixing plate is provided with a first mounting hole, and the needle cylinder is installed in the first mounting hole and fixed by the two nuts.

4. The pneumatic clamping mechanism for the spindle of a roundness tester according to claim 1, characterized in that, The fixing plate includes a mounting part, and the two ends of the mounting part are bent at 90° in the same direction to form a connecting part, which is connected to the fixing member.

5. The pneumatic clamping mechanism for the spindle of a roundness tester according to claim 4, characterized in that, The connecting part is mounted on the fixing member, and the direction of the bending of the mounting part is towards the disk.

6. The pneumatic clamping mechanism for the spindle of a roundness tester according to claim 1, characterized in that, The fastener is a cylindrical structure with an opening and several second mounting holes on its side wall. Bolts pass through the second mounting holes and the opening to clamp the connecting rod.

7. The pneumatic clamping mechanism for the spindle of a roundness tester according to claim 4, characterized in that, The fastener has a mounting surface for installing the connecting part.

8. The pneumatic clamping mechanism for the spindle of a roundness tester according to claim 4, characterized in that, The connecting part is provided with a third mounting hole for fixing the fixing plate. The third mounting hole is strip-shaped and used to adjust the position of the fixing plate. After the bolt passes through the third mounting hole, it is connected to the fixing member and the connecting part is installed on the fixing member.

9. The pneumatic clamping mechanism for the spindle of a roundness tester according to claim 1, characterized in that, The disk has a through hole in the middle, and the edge of the through hole extends axially upward to form a support member. The lower end of the main shaft has a connecting shaft, which is mounted on the support member.

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