Self-made three-point centering and clamping mechanism for cylinder
Patent Information
- Application Number
- CN202522392584.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-11
- Publication Date
- 2026-11-03
- Estimated Expiration
- 2035-11-11
AI Technical Summary
When dealing with irregular circular internal cavity products, existing non-standard fixtures, such as traditional expansion sleeves and chucks, suffer from problems such as high cost, short lifespan, and large space occupation, making it difficult to effectively clamp internal cavity workpieces such as motor housings.
It adopts a self-made cylinder three-point centering clamping mechanism with an upper and lower double-layer three-point centering design. It uses hydraulic or pneumatic drive piston to drive the movable push block, and achieves uniform clamping of workpiece through three sets of grippers. Combined with a pure mechanical structure, it has good force distribution and low cost characteristics.
It achieves efficient clamping of non-standard internal cavity workpieces, has good force distribution, low cost, long service life, wear resistance, and does not require additional power to release the workpiece, thus improving the safety and service life of the equipment.
Smart Images
Figure CN224927524U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of non-standard clamping technology, specifically to a self-made cylinder three-point centering clamping mechanism. Background Technology
[0002] In some non-standard fixtures, it is easy to come into contact with products with machined shapes such as motor housings, whose internal cavities are basically circular, and the diameter of the approximate circle varies in different locations. Usually, expansion sleeves and chucks can be used for such products; however, expansion sleeves need to be customized when dealing with non-standard products with irregular circular internal shapes, which is costly and has a short lifespan, and chip prevention is required. Chucks, on the other hand, require non-standard chuck jaws, and the chuck body is expensive and occupies a lot of space. Based on this, we developed a novel "self-made cylinder three-point centering clamping mechanism". This mechanism has a compact structure and occupies little space. It adopts a double-layer three-point centering design, which achieves workpiece positioning while providing good force distribution. The built-in self-made piston can be adapted to pneumatic or hydraulic drive, making it highly adaptable. The three-point support method has low requirements for the roundness of the workpiece's inner cavity and requires little containment space, making it particularly suitable for clamping non-standard inner cavities. Meanwhile, the mechanism adopts a purely mechanical structure, which has advantages such as low cost, long service life, wear resistance and durability. It effectively avoids the common drawbacks of traditional clamping methods in non-standard applications and provides a better solution for clamping internal cavity workpieces such as motor housings. Utility Model Content
[0003] To solve the above-mentioned technical problems, a self-made cylinder three-point centering clamping mechanism is provided. This technical solution solves the problems mentioned in the background technology.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A self-made cylinder three-point centering clamping mechanism includes a cylinder body, a flange fixedly installed at the bottom of the cylinder body, a sleeve fixedly installed at the top of the cylinder body, a base fixedly installed at the top of the sleeve, and a clamping mechanism inside the sleeve. The clamping mechanism includes several first and second jaws slidably installed on the side wall of the sleeve, and a piston slidably installed inside the cylinder body. A fixed rod is fixedly connected to the upper end of the piston, and a movable push block is rotatably installed at the upper end of the fixed rod. The upper end of the movable push block is provided with a mandrel and a large mandrel that push out the first and second jaws, and the large mandrel is sleeved on the surface of the mandrel and slidably installed inside the sleeve.
[0005] Preferably, one side of the movable push block is provided with an angular limiting block fixedly installed at the top of the cylinder body, the movable push block is slidably connected to the angular limiting block, and the middle of the angular limiting block is provided with a groove that matches the movable push block.
[0006] Preferably, a spring 1 is fixedly connected between the top of the mandrel and the base metal, and several springs 2 are fixedly connected between the large mandrel and the inner wall of the top of the sleeve.
[0007] Preferably, the side wall of the large spindle has a mounting hole, a guide key is fixedly installed inside the mounting hole, a guide groove 1 is opened on the spindle to slide with the guide key, a guide groove 2 is opened on the large spindle, and a guide block that is slidably connected to the guide groove 2 is fixedly installed on the side wall of the sleeve.
[0008] Preferably, the first and second jaws are each set in three groups, and are uniformly arranged in a ring on the side wall of the sleeve. The surfaces of the mandrel and the large mandrel are each provided with three sets of inclined surfaces, and the three sets of first jaws and the three sets of second jaws respectively abut against the three sets of inclined surfaces of the mandrel and the large mandrel.
[0009] Preferably, the bottom of the mandrel has a slot, and the bottom of the large mandrel is fixedly connected to a protrusion, which is engaged in the slot.
[0010] Preferably, a sealing ring one is fixedly installed between the cylinder body and the fixed rod, a sealing ring two is fixedly installed between the flange and the cylinder body, and a sealing ring three is fixedly installed between the piston and the cylinder body.
[0011] Compared with the prior art, the present invention proposes a self-made cylinder three-point centering clamping mechanism, which has the following beneficial effects: 1. This utility model includes a clamping mechanism. External pressure, such as hydraulic or pneumatic pressure, is input to the bottom of the cylinder, pushing the piston upward along the cylinder axis. The piston drives the fixed rod and movable push block at the top to move upward simultaneously. Because the movable push block is slidably connected to the angular limiting block, the angular limiting block restricts its rotation, ensuring that the movable push block only performs axial linear motion. When the movable push block moves upward, it simultaneously lifts the mandrel and the large mandrel, causing the three sets of inclined surfaces on the mandrel and the large mandrel to abut against the first and second clamping jaws, respectively, converting the axial thrust into the radial thrust of the clamping jaws. This allows the three sets of first and second clamping jaws to slide along the sleeve, ultimately clamping the workpiece from three evenly distributed points. By adopting a double-layer three-point centering design, the workpiece is positioned while having good force distribution. The three-point support method has low requirements for the roundness of the workpiece's inner cavity and requires little containment space, making it suitable for clamping non-standard inner cavities. At the same time, the overall structure is purely mechanical, offering advantages such as low cost, long service life, and wear resistance.
[0012] 2. In this utility model, sealing ring one, sealing ring two, and sealing ring three respectively seal the gaps between the cylinder body and the fixed rod, the flange and the cylinder body, and the piston and the cylinder body, effectively preventing leakage of pressure medium (oil / gas), ensuring piston power transmission efficiency, reducing energy loss, and extending the service life of the mechanism.
[0013] 3. In this utility model, after clamping is completed and the pressure is released, reliable releasing power is provided by the reset of spring one and spring two, which pushes the moving spindle and the large spindle downward, driving the entire mechanism to reset and release the workpiece. No additional power is required, which improves the safety of the equipment. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the overall internal structure of this utility model; Figure 3 This is a schematic diagram of the structure of the movable push block and the angular limiting block in this utility model; Figure 4 This is a schematic diagram of the internal clamping mechanism of the sleeve in this utility model; Figure 5 This is a schematic diagram of the structure of the mandrel and the large mandrel of this utility model; Figure 6 This is a bottom view of the central and large central shafts of this utility model.
[0015] The numbers on the map are: 1. Cylinder body; 2. Flange; 3. Sleeve; 4. Clamping mechanism; 5. Sealing plate; 101. Sealing ring one; 201. Oil inlet; 202. Sealing ring two; 301. Guide block; 401. Piston; 402. Sealing ring three; 403. Fixing rod; 404. Movable push block; 405. Angular limit block; 406. Mandrel; 407. Large mandrel; 408. First gripper; 409. Second gripper; 4010. Spring one; 4011. Spring two; 4012. Guide groove two; 4013. Mounting hole; 4014. Guide key; 4015. Guide groove one; 4016. Slot; 4017. Protrusion. Detailed Implementation
[0016] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.
[0017] Reference Figure 1 As shown, the self-made cylinder three-point centering clamping mechanism includes a cylinder body 1, a flange 2 fixedly installed at the bottom of the cylinder body 1, a sleeve 3 fixedly installed at the top of the cylinder body 1, a base 5 fixedly installed at the top of the sleeve 3, and a clamping mechanism 4 is provided inside the sleeve 3. Reference Figure 2-6As shown, specifically in this embodiment, the clamping mechanism 4 includes several first clamping claws 408 and second clamping claws 409 that are slidably mounted on the side wall of the sleeve 3, and a piston 401 that is slidably mounted inside the cylinder 1. A fixing rod 403 is fixedly connected to the upper end of the piston 401. A movable push block 404 is rotatably mounted on the upper end of the fixing rod 403. A spindle 406 and a large spindle 407 that push out the first clamping claws 408 and the second clamping claws 409 are provided on the upper end of the movable push block 404. The large spindle 407 is sleeved on the surface of the spindle 406 and is slidably mounted inside the sleeve 3.
[0018] Furthermore: External pressure is input to the bottom of cylinder 1 through the oil inlet of flange 2, pushing piston 401 to move upward along the cylinder 1 axis. Piston 401 drives the fixed rod 403 and movable push block 404 at the top to move upward simultaneously. When movable push block 404 moves upward, it simultaneously lifts mandrel 406 and large mandrel 407, thereby causing mandrel 406 and large mandrel 407 to push out the first gripper 408 and the second gripper 409, finally clamping the workpiece from three evenly distributed points. By adopting a double-layer three-point centering design, the workpiece is positioned while having good force distribution. The three-point support method has low requirements for the roundness of the workpiece's inner cavity and requires little containment space, making it suitable for clamping non-standard inner cavities. At the same time, the overall structure is purely mechanical, which has the advantages of low cost, long service life, and wear resistance.
[0019] Reference Figure 3 As shown, specifically in this embodiment, a angular limiting block 405 is fixedly installed on the top of the cylinder body 1 on one side of the movable push block 404. The movable push block 404 is slidably connected to the angular limiting block 405, and a groove adapted to the movable push block 404 is opened in the middle of the angular limiting block 405.
[0020] Furthermore: the piston 401 drives the fixed rod 403 at the top and the movable push block 404 to move upward synchronously. Since the movable push block 404 is slidably connected to the angular limit block 405, the angular limit block 405 restricts the rotation of the movable push block 404, ensuring that the movable push block 404 only makes axial linear motion, thus ensuring the accurate direction of its power transmission.
[0021] Reference Figure 4 As shown, specifically in this embodiment, a spring 4010 is fixedly connected between the top end of the spindle 406 and the base 5, and several springs 4011 are fixedly connected between the large spindle 407 and the inner wall of the top of the sleeve 3.
[0022] Furthermore: After clamping is completed and the pressure is released, the reset of spring 4010 and spring 4011 provides reliable release power, pushing the mandrel 406 and the large mandrel 407 downward, driving the entire mechanism to reset and release the workpiece without the need for additional power, thus improving the safety of the equipment.
[0023] Reference Figure 5 As shown, specifically in this embodiment, the side wall of the large spindle 407 is provided with a mounting hole 4013, and a guide key 4014 is fixedly installed inside the mounting hole 4013. The spindle 406 is provided with a guide groove 4015 that slides with the guide key 4014, the large spindle 407 is provided with a guide groove 4012, and a guide block 301 that slides with the guide groove 4012 is fixedly installed on the side wall of the sleeve 3.
[0024] Furthermore, the guide block 301 on the sleeve 3 is slidably connected to the guide groove 4012 on the large spindle 407, effectively restricting the rotation of the large spindle 407 and ensuring precise contact between the inclined surface of the large spindle 407 and the second gripper 409; at the same time, the guide key 4014 fixedly installed on the large spindle 407 is slidably connected to the guide groove 4015 opened on the spindle 406, which also ensures that there is no rotation between the spindle 406 and the large spindle 407, and ensures precise contact between the inclined surface of the spindle 406 and the first gripper 408.
[0025] Reference Figure 4 As shown, specifically in this embodiment, the first gripper 408 and the second gripper 409 are both set in three groups, and are uniformly arranged in a ring on the side wall of the sleeve 3. The surfaces of the mandrel 406 and the large mandrel 407 are each provided with three groups of inclined surfaces, and the three groups of first grippers 408 and the three groups of second grippers 409 respectively abut against the three groups of inclined surfaces of the mandrel 406 and the large mandrel 407.
[0026] Furthermore, by adopting a double-layer three-point centering design, the workpiece is positioned while having good force distribution. The three-point support method has low requirements for the roundness of the workpiece cavity and requires little containment space, making it suitable for clamping non-standard cavities.
[0027] Reference Figure 6 As shown, specifically in this embodiment, the bottom of the spindle 406 is provided with a slot 4016, and the bottom of the large spindle 407 is fixedly connected with a protrusion 4017, which is engaged in the slot 4016.
[0028] Furthermore: Since the movable push block 404 is rotatably mounted on the top of the fixed rod 403, it can rotate freely on the top of the fixed rod 403. When one end of the movable push block 404 abuts against the lower end of the protrusion 4017 or the bottom of the spindle 406, the other end of the movable push block 404 is still in a free state and will not push up the abutting protrusion 4017 or spindle 406. Only when both sides of the movable push block 404 abut against the lower end of the protrusion 4017 and the bottom of the spindle 406 at the same time, the movable push block 404 is limited, thereby synchronously pushing up the spindle 406 and the protrusion 4017, thereby realizing the synchronous lifting of the spindle 406 and the large spindle 407.
[0029] Reference Figure 2 As shown, specifically, in this embodiment, a sealing ring 101 is fixedly installed between the cylinder body 1 and the fixed rod 403, a sealing ring 202 is fixedly installed between the flange 2 and the cylinder body 1, and a sealing ring 302 is fixedly installed between the piston 401 and the cylinder body 1.
[0030] Furthermore, sealing ring 101, sealing ring 202, and sealing ring 302 respectively seal the gaps between cylinder body 1 and fixed rod 403, flange 2 and cylinder body 1, and piston 401 and cylinder body 1, effectively preventing leakage of pressure medium, ensuring the power transmission efficiency of piston 401, reducing energy loss, and extending the service life of the mechanism.
[0031] The working principle of this utility model is as follows: external pressure is input to the bottom of the cylinder 1 through the oil inlet of the flange 2, which pushes the piston 401 to move upward along the cylinder 1 axis. The piston 401 drives the fixed rod 403 and the movable push block 404 at the top to move upward synchronously. Since the movable push block 404 is slidably connected to the angular limiting block 405, the angular limiting block 405 restricts the rotation of the movable push block 404, ensuring that the movable push block 404 only makes axial linear motion. When the movable push block 404 moves upward, it simultaneously lifts the mandrel 406 and the large mandrel 407, so that the three sets of inclined surfaces on the mandrel 406 and the large mandrel 407 respectively abut against the first jaw 408 and the second jaw 409, converting the axial thrust into the radial thrust of the first jaw 408 and the second jaw 409. This causes the three sets of first jaw 408 and second jaw 409 to slide along the sleeve 3, and finally clamp the workpiece from three evenly distributed points.
[0032] This structure employs a double-layer, three-point centering design, which achieves workpiece positioning while providing excellent force distribution. The three-point support method has low requirements for the roundness of the workpiece's inner cavity and requires little containment space, making it suitable for clamping non-standard inner cavities. Furthermore, the overall structure is purely mechanical, offering advantages such as low cost, long lifespan, and wear resistance. During the clamping process, sealing ring 101, sealing ring 202, and sealing ring 3 402 respectively seal the gaps between cylinder 1 and fixed rod 403, flange 2 and cylinder 1, and piston 401 and cylinder 1, effectively preventing leakage of pressure medium, ensuring the power transmission efficiency of piston 401, reducing energy loss, and extending the service life of the mechanism.
[0033] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.
Claims
1. A self-made cylinder three-point centering clamping mechanism, characterized in that, Includes a cylinder body (1), a flange (2) is fixedly installed at the bottom of the cylinder body (1), a sleeve (3) is fixedly installed at the top of the cylinder body (1), a base (5) is fixedly installed at the top of the sleeve (3), and a clamping mechanism (4) is provided inside the sleeve (3). The clamping mechanism (4) includes several first jaws (408) and second jaws (409) that are slidably mounted on the side wall of the sleeve (3), and a piston (401) that is slidably mounted inside the cylinder (1). A fixed rod (403) is fixedly connected to the upper end of the piston (401). A movable push block (404) is rotatably mounted on the upper end of the fixed rod (403). A spindle (406) and a large spindle (407) that push out the first jaws (408) and the second jaws (409) are provided on the upper end of the movable push block (404). The large spindle (407) is sleeved on the surface of the spindle (406) and is slidably mounted inside the sleeve (3).
2. The self-made cylinder three-point centering clamping mechanism according to claim 1, characterized in that: The movable push block (404) has an angular limiting block (405) fixedly installed on the top of the cylinder body (1) on one side. The movable push block (404) and the angular limiting block (405) are slidably connected, and the angular limiting block (405) has a groove in the middle that is compatible with the movable push block (404).
3. The self-made cylinder three-point centering clamping mechanism according to claim 1, characterized in that: A spring (4010) is fixedly connected between the top end of the mandrel (406) and the base (5), and several springs (4011) are fixedly connected between the large mandrel (407) and the inner wall of the top of the sleeve (3).
4. The self-made cylinder three-point centering clamping mechanism according to claim 1, characterized in that: The side wall of the large spindle (407) is provided with a mounting hole (4013), and a guide key (4014) is fixedly installed inside the mounting hole (4013). The spindle (406) is provided with a guide groove (4015) that slides with the guide key (4014). The large spindle (407) has a guide groove (4012) and a guide block (301) that is slidably connected to the guide groove (4012) is fixedly installed on the side wall of the sleeve (3).
5. The self-made cylinder three-point centering clamping mechanism according to claim 1, characterized in that: The first jaw (408) and the second jaw (409) are each set in three groups, and are uniformly arranged in a ring on the side wall of the sleeve (3). The surfaces of the mandrel (406) and the large mandrel (407) are each provided with three sets of inclined surfaces, and the three sets of the first jaw (408) and the three sets of the second jaw (409) respectively abut against the three sets of inclined surfaces of the mandrel (406) and the large mandrel (407).
6. The self-made cylinder three-point centering clamping mechanism according to claim 1, characterized in that: The bottom of the spindle (406) is provided with a slot (4016), and the bottom of the large spindle (407) is fixedly connected with a protrusion (4017), which is engaged in the slot (4016).
7. The self-made cylinder three-point centering clamping mechanism according to claim 1, characterized in that: A sealing ring one (101) is fixedly installed between the cylinder body (1) and the fixed rod (403), a sealing ring two (202) is fixedly installed between the flange (2) and the cylinder body (1), and a sealing ring three (402) is fixedly installed between the piston (401) and the cylinder body (1).