Cylinder rapid centering hydraulic clamping device

Abstract

The utility model provides a rapid centering hydraulic clamping device for a cylinder. A bottom plate, a large end cover, an oil cylinder, a flange plate, a small end cover and a clamp body are coaxially and fixedly connected into a whole through a plurality of axial set screws in sequence; central holes of the large end cover, the flange plate and the small end cover are concentrically sealed and adaptively connected with a piston rod; the piston rod is coaxially and fixedly connected with the piston; the piston drives the piston rod to move in the sealing cavity through the pressure difference of hydraulic oil; the piston rod is coaxially connected with the pull rod; the upper end of the pull rod is fixedly connected with a collet; locking nuts are fixed at the lower ends of the pull rods; an inner cavity of the collet chuck is provided with the ornament block; and the spring chuck clamps or loosens the workpiece through the ornament block. The device is suitable for finish machining of thin-wall rotary parts of different models, and workpiece deformation is avoided; the device is simple and compact in structure, reasonable in design and relatively low in manufacturing cost; the operation is simple, fast, accurate and reliable; clamping and dismounting are convenient, special equipment and processes are not needed, and the labor intensity of workers is low; batch machining can be achieved, and the sizes and the positions of holes are kept consistent.

Description

Technical Field

[0001] The utility model belongs to the technical field of workpiece clamping of operating transport machine tools, and in particular relates to a rapid centering hydraulic automatic clamping device for processing holes of thin-walled cylindrical workpieces. Background Art

[0002] Up to now, mechanical manufacturing enterprises generally use mechanical chuck positioning method when processing cylindrical holes of thin-walled workpieces. Not only will improper clamping force cause large deformation of thin-walled parts and high scrap rate, but it is also labor-intensive and time-consuming, and is only suitable for the production of single or small batches of thin-walled workpieces. For the processing of large batches of thin-walled workpieces, the clamping efficiency is low and there is a potential risk of deformation. In this regard, the following technical solution is proposed. Utility Model Content

[0003] The utility model solves the technical problem of providing a cylinder rapid centering hydraulic clamping device to solve the technical problems of anti-deformation and fine processing of thin-walled rotating parts of different models.

[0004] The technical solution adopted by the utility model is: a cylindrical rapid centering hydraulic clamping device, including a base plate, a locking nut, a large end cover, a cone-end set screw, an oil cylinder, a piston, a flange, a small end cover, a piston rod, a clamp body, a pull rod, a spring chuck and a clamping block;

[0005] The base plate, the large end cover, the oil cylinder, the flange, the small end cover and the clamping body are coaxially fixedly connected as one in sequence by using a plurality of axial set screws;

[0006] The center holes of the large end cover, flange and small end cover are coaxially sealed and adapted to connect the piston rod that can be axially displaced; the piston is coaxially adapted and fixedly installed on the outer side of the middle part of the piston rod body; the piston drives the piston rod to axially displace through the pressure difference of the hydraulic oil in the sealed cavity composed of the flange, the cylinder and the large end cover; the hollow channel I formed on the piston rod is coaxially connected to the pull rod; the two ends of the pull rod pass through the hollow channel I of the piston rod; the upper end of the pull rod is coaxially detachably fixedly connected to the spring chuck; the lower end of the pull rod is coaxially detachably fixedly connected to the locking nut; the locking nut is reinforced and connected to the pull rod by a tapered set screw; the outer cone structure formed on the top of the spring chuck is adapted to the inner cone structure formed on the top of the clamp body; the inner cavity of the spring chuck is detachably and fixedly installed with a clamp block; the inner cavity of the clamp block is adapted to the workpiece to be clamped; the spring chuck clamps or loosens the workpiece through the clamp block.

[0007] To achieve the clamping or loosening action: after the oil cylinder is supplied with oil, the piston drives the piston rod to axially displace under the action of pressure difference; the axially displaced piston rod drives the axially displaced pull rod; the axially displaced pull rod drives the axially displaced spring chuck; the axially displaced spring chuck clamps or loosens the workpiece through the clamp block;

[0008] To achieve mechanical adjustment of the clamping force: when the piston rod position remains unchanged and the clamp body taper is constant, the locking nut is rotated to drive the spring collet to axially displace, and the change in the axial displacement of the spring collet is converted into a change in the radial size of the spring collet, thereby achieving the expansion or contraction of the taper part of the spring collet, thereby achieving the adjustment of the clamping force of the device.

[0009] In the above technical scheme, as a further improvement of the utility model: the front end of the spring chuck includes a vertebral structure, an expansion joint, and a side set screw mounting countersunk hole; the side set screw mounting countersunk hole is detachably fixedly connected to the chuck block through a side set screw I, and the side set screw I is used to prevent the spring chuck from rotating; the rear end of the spring chuck is formed with an internal threaded connecting hole; the internal threaded connecting hole is coaxially detachably fixedly connected to the upper end of the pull rod.

[0010] In the above technical scheme, as a further improvement of the utility model: the block has a plurality of circular arc petal clips with the same structure; the plurality of circular arc petal clips are concentric and evenly distributed along the radial direction of the workpiece; the plurality of circular arc petal clips form a circular ring sleeve structure; the circular ring sleeve structure is adapted to the outer surface of the workpiece and the inner surface of the spring chuck; each of the circular arc petal clips is detachably fixedly connected to the spring chuck by a side tightening screw II.

[0011] In the above technical solution, as a further improvement of the utility model: the vertical side wall of the clamp body is formed with a side set screw hole; the side set screw hole is installed with a side set screw; the side set screw is used to prevent the spring chuck from radially jumping.

[0012] In the above technical solution, as a further improvement of the utility model: the upper and lower ends of the large end cover are coaxially flange-connected to the oil cylinder and the base plate.

[0013] In the above technical solution, as a further improvement of the utility model: the bottom plate is made with a hollow structure; the hollow structure is incorporated into the lower end of the pull rod, and the hollow structure is used to provide a movement space for the axial displacement of the pull rod.

[0014] In the above technical solution, as a further improvement of the utility model: the large end cover is formed with an oil circuit below the piston; and the oil cylinder is formed with an oil circuit above the piston.

[0015] In the above technical scheme, as a further improvement of the utility model: the outer side of the middle part of the piston rod body is coaxially fixedly connected to the piston; the upper end surface of the piston plug body is axially limited and fixed by the piston rod shoulder; the lower end surface of the piston plug body is axially limited and fixed by a plurality of limit nuts; the limit nut is threadedly connected to the external thread of the piston rod body.

[0016] In the above technical scheme, as a further improvement of the utility model: the pull rod is a hollow T-shaped structure; the upper end of the T-shaped structure is connected to the lower end of the spring chuck through an external thread; the lower end of the T-shaped structure is connected to the locking nut through an external thread; the hollow channel II formed in the pull rod is used for chip removal.

[0017] In the above technical scheme, as a further improvement of the utility model: the lower end surface of the flange body is formed with an outward convex structure, and the upper end surface of the flange body is formed with an inward concave structure; the outward convex structure is used for the upper limit position of the piston; the inward concave structure is adapted to be connected to the small end cover by a sinking seal; the longitudinal section of the small end cover is a T-shaped structure; and the small end cover is flange-connected to the flange.

[0018] The advantages of this utility model compared with the prior art:

[0019] 1. Compared with pneumatic drive clamping, the hydraulic system of the utility model can provide stable clamping force. Such stability is crucial to ensure machining accuracy and workpiece quality, and facilitates precise control. The hydraulic drive has small vibration and impact, strong adaptability, and high degree of automation, and can be widely used in many industrial fields, and has become an important means to improve production efficiency and machining quality.

[0020] 2. The utility model has a quick-detachable connection structure between the clamp block and the spring chuck, and a quick-detachable connection structure between the spring chuck and the pull rod. By replacing the clamp block, the application range of the workpiece to be processed can be expanded, and the clamping requirements of workpieces of various specifications can be met. At the same time, the worn or damaged clamp block can be replaced in time, which also helps to extend the overall service life of the spring chuck. The quick-detachable and replaceable connection structure between the clamp block and the spring chuck, and between the spring chuck and the pull rod means that when processing different workpieces, the time for replacing fixtures and adjusting equipment can be reduced, which helps to improve production efficiency.

[0021] 3. The workpiece of the utility model is mounted on the spring chuck, and can be precisely centered and clamped through the chuck block, further ensuring the processing accuracy and quality of the product.

[0022] 4. The upper end of the pull rod of the utility model is coaxially threaded with the bottom end of the spring chuck, the middle part of the pull rod is coaxially fixedly connected to the piston rod, and the bottom end of the pull rod is coaxially fixedly connected to the locking nut; when it is necessary to clamp or loosen the workpiece: the axial displacement of the piston is achieved by controlling the direction of the oil circuit, the piston drives the axial displacement of the piston rod, the piston rod drives the axial displacement of the pull rod, the pull rod drags the spring chuck of the outer cone structure to axially displace along the clamping body of the inner cone structure, and the spring chuck finally clamps or loosens the workpiece through the clamping block. The overall coaxiality of the device is high and the centering effect is good. Therefore, it has the technical advantages of fast and automatic clamping, high efficiency, high coaxial positioning accuracy, small workpiece deformation, and easy operation. It is particularly suitable for workpieces produced in batches.

[0023] 5. The lower end of the pull rod of the utility model is coaxially fixedly connected to the locking nut. Under the premise that the piston rod is fixed and the taper of the clamp body is certain, the locking nut is adjusted by rotating the axial displacement of the spring collet upward or downward, which is converted into a change in the radial size of the spring collet, that is, the taper of the spring collet is partially expanded or contracted, thereby realizing the mechanical size adjustment of the clamping force; this mechanical adjustment function enables the clamping force to be adaptively adjusted according to the different wall thicknesses of the workpieces, thereby meeting the anti-deformation clamping effect of different workpieces and ensuring the continuity and efficiency of the machining process; in addition, the mechanical clamping force adjustment function of the spring collet has the technical advantages of rapid adjustment and efficiency, precision and stability, flexibility and adaptability, economy and high cost-effectiveness.

[0024] 6. The coaxial sealing fastening fixed connection structure between the clamp body, flange, upper end cover, oil cylinder, large end cover and bottom plate of the utility model is convenient for processing, manufacturing, assembly and disassembly, with relatively low manufacturing cost, easy to implement, economical and practical, and suitable for promotion.

[0025] 7. The hollow channel I of the piston rod of the utility model is used for concentric assembly with the pull rod. The middle external thread of the piston rod connects the piston and the piston rod reliably axially through the positioning nut and the opposite side shoulder to prevent the axial displacement of the piston relative to the piston rod.

[0026] 8. The side wall of the clamp body of the utility model is provided with a set screw hole to prevent the spring clamp from radially jumping.

[0027] 9. The hollow structure of the hollow channel II of the pull rod of the utility model, on the one hand, facilitates the smooth chip removal during the workpiece hole processing, and on the other hand, is light in weight and helps to reduce the weight of the device.

[0028] 10. The utility model is particularly suitable for the finishing of thin-walled rotating parts of different models, and can effectively prevent deformation problems during the clamping process of the workpiece; the overall structure of the device is simple and compact, the design is reasonable, and the manufacturing cost is relatively low; the operation is simple and fast, accurate and reliable; the weight is light, and the clamping and disassembly are convenient; no special equipment and processes are required, and the labor intensity of workers is low; batch parts processing can be realized, and the hole size and position remain consistent. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a longitudinal cross-sectional schematic diagram of the device of the utility model;

[0030] Figure 2 This is the front view of the bottom plate of the utility model;

[0031] Figure 3 This is a schematic cross-sectional view of the large end cover of the utility model;

[0032] Figure 4 This is a semi-front view of the large end cover of the utility model;

[0033] Figure 5 This is a longitudinal cross-sectional view of the oil cylinder of the utility model;

[0034] Figure 6 This is a longitudinal cross-sectional view of the piston of the utility model;

[0035] Figure 7 It is a schematic cross-sectional view of the small end cover of the utility model;

[0036] Figure 8 This is a semi-front view of the small end cover of the utility model;

[0037] Fig. 9 This is a half-section view of the piston rod of the utility model;

[0038] Fig.10 This is an axial cross-sectional view of the pull rod of the utility model;

[0039] Fig.11 This is a longitudinal cross-sectional view of the clamp body of the utility model;

[0040] Fig.12 This is a longitudinal cross-sectional view of the flange of the utility model;

[0041] Fig.13 It is a longitudinal cross-sectional view of the spring chuck of the utility model;

[0042] Fig.14 This is the front view of the block of the utility model;

[0043] Fig.15 This is a cross-sectional view of the utility model block;

[0044] Fig.16It is a longitudinal cross-sectional schematic diagram of the utility model device in a state without a workpiece.

[0045] In the figure: 1-base plate, 2-locking nut, 3-large end cover, 4-cone-end set screw, 5-oil cylinder, 6-piston, 7-flange, 8-small end cover, 9-piston rod, 10-clamp body, 11-pull rod, 12-spring chuck, 13-block, 14-workpiece; 121-vertebral structure, 122-expansion joint, 123-side set screw mounting countersunk hole, 124-internal thread connecting hole, 131-arc petal clip, 1001-side set screw hole, 101-hollow structure, 301-oil circuit below piston, 501-oil circuit above piston, 901-hollow channel I, 902-external thread, 903-limit nut, 904-piston rod shoulder, 905-middle part of rod body. DETAILED DESCRIPTION

[0046] The following will be combined with the attached embodiment of the utility model Figure 1-15 , clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0047] A cylindrical rapid centering hydraulic clamping device, (such as Figure 1 The device comprises a base plate 1, a locking nut 2, a large end cover 3, a cone-end set screw 4, a cylinder 5, a piston 6, a flange 7, a small end cover 8, a piston rod 9, a clamp body 10, a pull rod 11, a spring chuck 12 and a clamp block 13. The device is assembled by the aforementioned multiple components, each of which is relatively easy to process, which is beneficial to reducing and controlling the overall cost of the device.

[0048] Similarly, in order to facilitate quick assembly, simplify processing, reduce costs and ensure the overall coaxiality of the device: the base plate 1, large end cover 3, cylinder 5, flange 7, small end cover 8, and clamp body 10 are coaxially fixed together using multiple axial set screws in sequence.

[0049] The central holes of the large end cover 3, flange 7 and small end cover 8 are concentrically sealed and adapted to connect the piston rod 9 which can be axially displaced. Figure 1 Seal structure and seal type shown.

[0050] The piston rod 9 is coaxially adapted to fix the piston 6 on the outer side of the middle part of the rod body. The specific preferred limiting and positioning method of the piston 6 is described below.

[0051] The piston 6 is in a sealed cavity composed of the flange 7, the oil cylinder 5 and the large end cover 3, and the piston 6 drives the piston rod 9 to synchronously move in the axial direction through the pressure difference of the hydraulic oil. That is, the automatic control clamping operation of the thin-walled cylindrical workpiece 14 is realized by operating the flow direction of the hydraulic oil and converting it into mechanical energy through the transmission structure described later.

[0052] Specifically: the piston rod 9 is provided with a hollow hole Ⅰ901; the hollow hole Ⅰ901 is used to coaxially connect the pull rod 11. After the pull rod 11 passes through the hollow hole Ⅰ901 of the piston rod 9, it is locked with a locking nut 2, that is, the locking nut 2 is positioned against the shoulder step formed on the pull rod 11. Then, the locking nut 2 is fixed to the pull rod 11 with a tapered set screw 4. Both ends of the pull rod 11 pass through the hollow hole Ⅰ901 of the piston rod 9; the upper end of the pull rod 11 is coaxially detachably fixedly connected to the spring chuck 12; the lower end of the pull rod 11 is coaxially detachably fixedly connected to the locking nut 2.

[0053] The locking nut 2 is reinforced and connected to the pull rod 11 by a cone-end set screw 4 .

[0054] The outer cone structure formed on the top of the spring clamp 12 is adapted to the inner cone structure formed on the top of the clamp body 10 .

[0055] The inner cavity of the spring chuck 12 can be detachably fixed with a clamping block 13. The inner cavity of the clamping block 13 is adapted to the workpiece 14 to be clamped; the spring chuck 12 clamps or releases the workpiece 14 through the clamping block 13.

[0056] The working principle of the device for clamping or releasing the workpiece: after the cylinder 5 is supplied with oil, the piston 6 drives the piston rod 9 to axially displace under the action of the pressure difference; the axially displaced piston rod 9 drives the pull rod 11 to axially displace; the axially displaced pull rod 11 drives the spring chuck 12 to axially displace; the axially displaced spring chuck 12 clamps or releases the workpiece 14 through the clamping block 13.

[0057] Specifically, when the device is connected to the oil circuit, the upper oil pipe supplies oil, and under the action of pressure difference, the piston 6 drives the piston rod 9 downward, the piston rod 9 drives the pull rod 11 downward, the pull rod 11 drives the spring chuck 12 downward, the spring chuck 12 contracts and causes the chuck 13 to contract, thus achieving the clamping action on the workpiece 14; on the contrary, when the lower oil pipe supplies oil, under the action of pressure difference, the piston 6 drives the piston rod 9 upward, the piston rod 9 drives the pull rod 11 upward, the pull rod 11 drives the spring chuck 12 upward, the spring chuck 12 expands and causes the chuck 13 to relax, thus smoothly removing the workpiece 14. By analogy, the batch efficient clamping and loosening operation of the workpiece 14 is achieved, and the clamping, positioning and processing of the workpiece 14 are completed efficiently, with high precision and without deformation.

[0058] The working principle of the device clamping force adjustment: When the position of the piston rod 9 remains unchanged and the taper of the clamp body 10 is constant, as long as the locking nut 2 is rotated, the pull rod 11 will rotate together, and the thread connecting the upper end of the pull rod 11 with the spring chuck 12 will convert the rotational motion into the axial movement of the spring chuck 12. At this time, the axial keyway provided in the spring chuck 12 has a radial top screw stuck in the axial keyway to prevent the radial rotation of the spring chuck 12, thereby achieving the purpose of adjusting the clamping force. That is, rotating the locking nut 2 drives the spring chuck 12 to axially displace by the pull rod 11, converting the change in the axial displacement of the spring chuck 12 into a change in the radial size of the spring chuck 12, realizing the expansion or contraction of the taper part of the spring chuck 12, thereby achieving the adjustment of the clamping force of the device.

[0059] In the above embodiment, as a further improvement of the utility model: (such as Fig.13 The front end of the spring chuck 12 includes a vertebral structure 121, an expansion joint 122, and a side set screw installation countersunk hole 123 (combined with Figure 1 ).

[0060] The side set screw mounting countersunk hole 123 is detachably fixedly connected to the chuck block 13 via a side set screw I, and the side set screw I is used to prevent the spring chuck 12 from rotating.

[0061] The rear end of the spring chuck 12 is formed with an internal thread connection hole 124; the internal thread connection hole 124 is coaxially detachably fixedly connected to the upper end of the pull rod 11 (combined with Figure 1 ).

[0062] In the above embodiment, as a further improvement of the utility model: (such as Fig.14 , Fig.15 The block 13 has a plurality of circular arc petal clips 131 with the same structure; the plurality of circular arc petal clips 131 are concentric and evenly distributed along the radial direction of the workpiece 14; generally, there are three or four circular arc petal clips 131. The circular arc petal clips 131 form a circular ring sleeve structure; the circular ring sleeve structure is adapted to the outer side surface of the workpiece 14 and the inner side surface of the spring chuck 12. Each of the circular arc petal clips 131 is detachably fixedly connected to the spring chuck 12 by a side set screw II.

[0063] In the above embodiment, as a further improvement of the utility model: (such as Fig.11 (As shown in the figure) the vertical side wall of the clamp body 10 is formed with a side set screw hole 1001; the side set screw hole 1001 is used to install a side set screw; the side set screw is used to prevent the spring clamp 12 from radially jumping.

[0064] In the above embodiment, as a further improvement of the utility model: (such as Figure 1The upper and lower ends of the large end cover 3 are coaxially flange-connected to the oil cylinder 5 and the base plate 1.

[0065] In the above embodiment, as a further improvement of the utility model: (such as Figure 1 As shown in the figure, the bottom plate 1 is made with a hollow structure 101; the hollow structure 101 is incorporated into the lower end of the pull rod 11, and the hollow structure 101 is used to provide a movement space for the axial displacement of the pull rod 11.

[0066] In the above embodiment, as a further improvement of the utility model: the large end cover 3 is provided with an oil circuit 301 below the piston; the oil cylinder 5 is provided with an oil circuit 501 above the piston. When the oil circuit is connected, the upper and lower oil circuits switch oil supply, and under the action of the pressure difference, the piston 6 drives the piston rod 9 to axially move.

[0067] In the above embodiment, as a further improvement of the utility model: (such as Figure 1 , Fig. 9 The piston rod 9 is coaxially fixedly connected to the piston 6 on the outer side of the middle portion 905 of the rod body. Figure 1 (As shown in the figure) the upper end surface of the piston 6 plug body is axially limited and fixed by a piston rod shoulder 904; the lower end surface of the piston 6 plug body is axially limited and fixed by a plurality of limit nuts 903; the limit nuts 903 are threadedly connected to the external thread 902 of the piston rod 9 rod system.

[0068] In the above embodiment, as a further improvement of the utility model: the pull rod 11 is a hollow T-shaped structure; the upper end of the T-shaped structure is connected to the lower end of the spring chuck 12 through an external thread; the lower end of the T-shaped structure is connected to the locking nut 2 through an external thread; the hollow channel II formed in the pull rod 11 is used for smooth chip removal during the hole machining of the workpiece 14 (such as Figure 1 , Fig.10 shown).

[0069] In the above embodiment, as a further improvement of the utility model: (such as Fig.12 As shown in the figure, the lower end surface of the flange 7 is provided with a convex structure 701, and the upper end surface of the flange 7 is provided with a concave structure 702; the convex structure 701 is used for the upper limit position of the piston 6; the concave structure 702 is adapted to be connected to the small end cover 8 in a sinking seal; the longitudinal section of the small end cover 8 is a T-shaped structure; and the small end cover 8 is flange-connected to the flange 7 (combined with Figure 1 shown).

[0070] Through the above structural design, the technical advantage of the utility model is that the hydraulic drive clamping operation of the utility model can provide a stable clamping force compared with the pneumatic drive clamping, and this stability is crucial to ensure the processing accuracy and workpiece quality; although the pneumatic system can also provide a certain clamping force, its stability is relatively poor, and the pneumatic clamping force is greatly affected by factors such as air pressure fluctuations, and it is difficult to achieve precise control. In addition, the hydraulic system generates less vibration and impact during operation, which is conducive to protecting the workpiece and fixture, reducing processing errors and damage; the pneumatic system may generate greater vibration and impact during operation, which has an adverse effect on the workpiece and fixture. The hydraulic system can adapt to a variety of different working environments and processing requirements. By replacing different slugs 13, it can achieve clamping of workpieces 14 of different shapes, sizes and materials; the pneumatic system also has a certain adaptability, but it may not meet the processing requirements in some special occasions. With the development of industrial automation, hydraulic systems are increasingly combined with CNC systems, sensors, etc. to achieve automated clamping and processing. This highly automated production method can significantly improve production efficiency and processing accuracy. Pneumatic systems can also achieve a certain degree of automated production, but may not be as perfect as hydraulic systems in some aspects.

[0071] The detachable connection structure of the chuck 13 and the spring chuck 12 of the utility model allows the operator to quickly and easily replace the chuck 13 of different models to adapt to the processing of thin-walled workpieces 14 of different sizes, shapes or materials. This flexibility is particularly important when the production line frequently changes product models or produces multiple varieties. In addition, the worn or damaged chuck 13 can be replaced in time, which also helps to extend the overall service life of the spring chuck 12.

[0072] The workpiece 14 of the utility model is mounted on the spring chuck 12, and can be precisely centered and clamped through the clamp block 13, thereby ensuring the processing accuracy and processing quality of the product.

[0073] The spring chuck 12 of the utility model is coaxially screwed to the top of the pull rod 11, which can realize the rapid disassembly and replacement of the spring chuck 12 including the clamp block 13. The ability to quickly replace the clamp block 13 means that when processing workpieces 14 of different models, sizes and shapes, the time for replacing fixtures and adjusting equipment can be reduced, thereby improving production efficiency. With the advancement of technology and changes in process requirements, the detachable connection structure makes it easier to upgrade and maintain the spring chuck 12 and the clamp block 13. For example, the clamp block 13 with higher wear resistance, better lubrication performance or more advanced clamping mechanism can be replaced to improve the processing quality and efficiency of the workpiece 14.

[0074] The lower end of the pull rod 11 of the utility model is coaxially fixedly connected to the locking nut 2. By rotating the locking nut 2 to adjust the pull rod 10, the spring collet 12 can be made to make an axial displacement change upward or downward under the premise that the piston rod 9 is fixed and the taper of the clamp body 10 is certain, which is converted into a change in the radial size of the spring collet 12, that is, the taper part of the spring collet 12 is expanded or contracted, thereby realizing the mechanical size adjustment of the clamping force.

[0075] This mechanical adjustment function enables the clamping force to be adaptively adjusted according to the different wall thicknesses of the workpiece 14, thereby meeting the anti-deformation clamping effect of different workpieces 14 while ensuring the continuity and efficiency of the processing process.

[0076] In addition, the spring chuck 12 can also have a variety of specifications and models to adapt to different diameters and shapes of the chuck 13 and the workpiece 14; by adjusting the size of the clamping force, the application scope of the device can be further expanded to meet more diverse processing needs.

[0077] The mechanical clamping force adjustment structure of the utility model device enables the spring chuck 12 to be flexibly adjusted according to different processing conditions and the characteristics of the workpiece 14, thereby improving the flexibility and adaptability of the processing process. Therefore, the mechanical clamping force adjustment function of the spring chuck 12 has many technical advantages in terms of rapid adjustment and high efficiency, precision and stability, flexibility and adaptability, economy and cost-effectiveness.

[0078] The coaxial sealing fastening fixed connection structure among the clamp body 10, flange 7, upper end cover 8, oil cylinder 5, large end cover 3 and bottom plate 1 of the utility model is convenient for processing, manufacturing, assembly and disassembly, has relatively low manufacturing cost, is easy to implement, economical and practical, and suitable for promotion.

[0079] The oil cylinder 5 of the utility model is connected between the large end cover 8, the flange 7 and the upper end cover 8, and is completely sealed by multiple sealing rings. The piston 6 drives the piston rod 9 to move up and down in the oil cylinder 5. The clamping action is mainly driven by the pressure difference between the inlet and outlet oil circuits, and the operation is simple.

[0080] The hollow channel 901 of the piston rod 9 of the utility model is used for concentric assembly with the pull rod 11. The middle external thread 902 of the piston rod 9 connects the piston 6 and the piston rod 9 reliably axially limited and positioned through the positioning nut 903 and the opposite piston rod shoulder 904, preventing the axial displacement of the piston 6 relative to the piston rod 9, which is stable and reliable.

[0081] The side wall of the clamp body 10 of the utility model is formed with a set screw hole 1001, which is used to prevent the spring clamp 12 from radially jumping, and the concentricity is excellent.

[0082] The pull rod 11 of the utility model is a hollow structure, which facilitates the smooth chip removal during the machining of the workpiece 14 hole, and is light in weight, which helps to reduce the weight of the device.

[0083] In summary, the utility model is particularly suitable for the finishing of thin-walled rotating parts of different models, and can effectively prevent the deformation problem of the workpiece 14 during the clamping process; the overall structure of the device is simple and compact, the design is reasonable, the manufacturing cost is relatively low, the operation is simple and fast, and it is accurate and reliable; it is light in weight, easy to clamp and disassemble, does not require the use of special equipment and processes, and the labor intensity of workers is low; batch parts processing can be achieved, and the hole size and position remain consistent.

[0084] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification and equivalent replacement made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A cylindrical rapid centering hydraulic clamping device, characterized in that: It comprises a base plate (1), a locking nut (2), a large end cover (3), a cone-end set screw (4), an oil cylinder (5), a piston (6), a flange (7), a small end cover (8), a piston rod (9), a clamp body (10), a pull rod (11), a spring chuck (12) and a clamp block (13); The base plate (1), the large end cover (3), the oil cylinder (5), the flange (7), the small end cover (8), and the clamp body (10) are coaxially fixedly connected as a whole in sequence using a plurality of axial set screws; The central holes of the large end cover (3), flange (7) and small end cover (8) are coaxially sealed and adapted to connect the piston rod (9) which can be axially displaced; the outer side of the middle part (905) of the piston rod (9) is coaxially adapted and fixedly installed with the piston (6); the piston (6) is in a sealed cavity composed of the flange (7), the oil cylinder (5) and the large end cover (3), and the axial displacement of the piston rod (9) is achieved by the pressure difference of the hydraulic oil driven by the piston (6); the hollow channel I (901) formed on the piston rod (9) is coaxially connected to the pull rod (11); the two ends of the pull rod (11) pass through the hollow channel I (901) of the piston rod (9); the pull rod (11) 1) The upper end is coaxially and detachably fixedly connected to the spring chuck (12); the lower end of the pull rod (11) is coaxially and detachably fixedly connected to the locking nut (2); the locking nut (2) is reinforced to be connected to the pull rod (11) by a conical-end set screw (4); the outer cone structure formed at the top of the spring chuck (12) is compatible with the inner cone structure formed at the top of the clamp body (10); the inner cavity of the spring chuck (12) is detachably and fixedly mounted with a clamp block (13); the inner cavity of the clamp block (13) is compatible with the workpiece (14) to be clamped; the spring chuck (12) clamps or releases the workpiece (14) through the clamp block (13); After the oil cylinder (5) supplies oil, the piston (6) drives the piston rod (9) to axially displace under the action of pressure difference; the axially displaced piston rod (9) drives the pull rod (11) to axially displace; the axially displaced pull rod (11) drives the spring chuck (12) to axially displace; the axially displaced spring chuck (12) clamps or releases the workpiece (14) through the clamping block (13); When the position of the piston rod (9) remains unchanged and the taper of the clamp body (10) is constant, the locking nut (2) is rotated to drive the spring clamp (12) to axially displace via the pull rod (11), thereby converting the change in the axial displacement of the spring clamp (12) into a change in the radial size of the spring clamp (12), thereby achieving the expansion or contraction of the taper portion of the spring clamp (12), thereby achieving the adjustment of the clamping force of the device.

2. The cylindrical rapid centering hydraulic clamping device according to claim 1 is characterized in that: The front end of the spring chuck (12) includes a vertebral structure (121), an expansion joint (122), and a side set screw mounting countersunk hole (123); the side set screw mounting countersunk hole (123) is detachably fixedly connected to the chuck block (13) via a side set screw I, and the side set screw I is used to prevent the spring chuck (12) from rotating; the rear end of the spring chuck (12) is formed with an internal threaded connection hole (124); the internal threaded connection hole (124) is coaxially detachably fixedly connected to the upper end of the pull rod (11).

3. The cylindrical rapid centering hydraulic clamping device according to claim 1 or 2, characterized in that: The yoke (13) has a plurality of circular arc petal clips (131) with the same structure; the plurality of circular arc petal clips (131) are concentric and evenly distributed along the radial direction of the workpiece (14); the plurality of circular arc petal clips (131) form a circular ring sleeve structure; the circular ring sleeve structure is compatible with the outer side surface of the workpiece (14) and the inner side surface of the spring chuck (12); each of the circular arc petal clips (131) is detachably fixedly connected to the spring chuck (12) via a side set screw II.

4. The cylindrical rapid centering hydraulic clamping device according to claim 1 is characterized in that: The vertical side wall of the clamp body (10) is formed with a side set screw hole (1001); the side set screw hole (1001) is installed with a side set screw; the side set screw is used to prevent the spring clamp (12) from radially jumping.

5. The cylindrical rapid centering hydraulic clamping device according to claim 1 is characterized in that: The upper and lower ends of the large end cover (3) are coaxially flange-connected to the oil cylinder (5) and the bottom plate (1).

6. The cylindrical rapid centering hydraulic clamping device according to claim 1 or 5, characterized in that: The bottom plate (1) is provided with a hollow structure (101); the hollow structure (101) is incorporated into the lower end of the pull rod (11), and the hollow structure (101) is used to provide a movement space for the axial displacement of the pull rod (11).

7. The cylindrical rapid centering hydraulic clamping device according to claim 1 or 5, characterized in that: The large end cover (3) is provided with an oil passage (301) below the piston; and the oil cylinder (5) is provided with an oil passage (501) above the piston.

8. The cylindrical rapid centering hydraulic clamping device according to claim 1 is characterized in that: The outer side of the middle part (905) of the piston rod (9) is coaxially fixedly connected to the piston (6); the upper end surface of the piston (6) plug body is axially limited and fixed by a piston rod shoulder (904); the lower end surface of the piston (6) plug body is axially limited and fixed by a plurality of limit nuts (903); the limit nuts (903) are threadedly connected to the external thread (902) of the piston rod (9) body.

9. The cylindrical rapid centering hydraulic clamping device according to claim 1 or 2, characterized in that: The pull rod (11) is a hollow T-shaped structure; the upper end of the T-shaped structure is connected to the lower end of the spring chuck (12) via an external thread; the lower end of the T-shaped structure is connected to the locking nut (2) via an external thread; the hollow channel II (1101) formed on the pull rod (11) is used for chip removal.

10. The cylindrical rapid centering hydraulic clamping device according to claim 1, characterized in that: The lower end surface of the flange (7) is provided with an outward convex structure (701), and the upper end surface of the flange (7) is provided with an inward concave structure (702); the outward convex structure (701) is used for the upper limit position of the piston (6); the inward concave structure (702) is connected to the small end cover (8) in a sinking seal adapter; the longitudinal section of the small end cover (8) is a T-shaped structure; and the small end cover (8) is flange-connected to the flange (7).

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