Hydraulic drive clamping device

Abstract

The invention discloses a hydraulic drive clamping device which comprises a hydraulic drive mechanism, a drive shaft of the hydraulic drive mechanism is connected with a clamping mechanism, and the clamping mechanism comprises a disc assembly and a plurality of clamping assemblies. The disc assembly comprises a main disc and a first cam disc, and the first cam disc is provided with a flange part and a sharp convex part; the clamping assembly comprises a linkage block which is slidably connected in the diameter direction of the main disc, a first rotating wheel is arranged at the first end of the linkage block, and the first rotating wheel abuts against the outer periphery of the first cam disc; a clamping convex block is arranged at the second end of the linkage block, a clamping spring is arranged between the linkage block and the clamping convex block, an outer arc surface and an inner tangent plane are oppositely arranged on the clamping convex block, and a flexible pressing plate is arranged on the inner tangent plane; through the linkage design of the cam disc and the multiple sets of clamping assemblies, synchronous self-adaptive clamping of the inner wall and the outer wall is achieved, the clamping device has the advantages of being compact in structure, even and stable in clamping force and suitable for workpieces with different wall thicknesses, and meanwhile it is ensured that the surfaces of the workpieces are not damaged in the clamping process through the flexible pressing plate.

Description

Technical Field

[0001] The present invention relates to the technical field of mechanical fixtures, and particularly to a hydraulic drive clamping device. Background Art

[0002] In high-end equipment fields such as automobile manufacturing and aerospace, circular tube workpieces, as the core components of conveying pipelines and drive shaft systems, their machining accuracy directly affects the system sealing performance and power transmission efficiency. With the upgrading of intelligent manufacturing, automated production lines have put forward higher requirements for pipe clamping devices: it is necessary to achieve instantaneous precise positioning during high-speed continuous feeding, adapt to wide-range pipe diameter changes, and at the same time avoid roundness distortion caused by uneven clamping force. Especially in the scenario of precision machining of thin-walled pipes, traditional clamping methods are prone to cause surface scratches or micro-deformations of workpieces, directly leading to quality defects such as increased leakage rate of pipeline systems and dynamic balance failure of drive shafts.

[0003] Existing hydraulic drive clamping devices mostly adopt a single-side pressure application mode. For example, a hydraulic drive external expansion type pipe fixture is used, and a conical mandrel is pushed by a hydraulic cylinder to radially expand elastic jaws to achieve outer wall clamping. Although such technologies can ensure the basic clamping force, they have significant defects: unidirectional clamping leads to mechanical imbalance - when externally expanding and clamping, there is no corresponding constraint on the inner wall of the pipe, resulting in poor binding force; while internal support type fixtures can correct the inner circle, but they cannot suppress the out-of-roundness of the outer wall. In addition, existing technologies mostly rely on multiple independent hydraulic cylinders to drive different jaws, with a high structural redundancy, making it difficult to meet the layout requirements of compact machining centers and unable to meet the high-rigidity clamping requirements of alloy pipes.

[0004] In view of this, it is necessary to improve the hydraulic drive clamping structure in the existing technology to solve the technical problem of poor binding force caused by single-wall surface stress. Summary of the Invention

[0005] The purpose of the present invention is to provide a hydraulic drive clamping device to solve the above technical problems.

[0006] To achieve this purpose, the present invention adopts the following technical solutions: A hydraulic drive clamping device includes a hydraulic drive mechanism, a drive shaft of the hydraulic drive mechanism is connected with a clamping mechanism, the clamping mechanism includes a disc assembly, and a plurality of clamping assemblies arranged along the circumferential direction of the disc assembly; The disc assembly includes a main disc, and a first cam disc coaxially arranged with the drive shaft, the first cam disc has a flange portion and a pointed convex portion, and there is a first height difference between the pointed convex portion and the flange portion, and the first height difference is adapted to the wall thickness of the workpiece to be clamped; The clamping assembly includes a linkage block slidably connected along the diameter direction of the main disc, a first runner is arranged at a first end of the linkage block, and the first runner abuts against the outer peripheral edge of the first cam disc; The second end of the linkage block is provided with a clamping convex block, and a clamping spring is arranged between the linkage block and the clamping convex block. An outer arc surface and an inner cutting surface are oppositely arranged on the clamping convex block, and a flexible pressing plate is arranged on the inner cutting surface.

[0007] Optionally, the clamping assembly further includes a mounting block arranged on the main disc. A sliding groove is formed in the middle of the mounting block along the diameter direction of the main disc, and the linkage block is slidably connected to the sliding groove; An elastic member is arranged on the mounting block. One end of the elastic member is connected to the linkage block, and the elastic member is used to push the linkage block to move towards the center of the main disc.

[0008] Optionally, a plurality of circle-expanding assemblies are further arranged on the disc assembly along its circumferential direction. The disc assembly further includes a second cam disc coaxially arranged with the driving shaft and a shaft sleeve arranged on the main disc; The circle-expanding assembly includes a driving shaft. The driving shaft is rotatably connected to the shaft sleeve, and both ends of the driving shaft penetrate through the main disc respectively. A belt wheel assembly is connected to the first end of the driving shaft, and a swing pin assembly is connected to the second end of the driving shaft, wherein the belt wheel assembly and the swing pin assembly are arranged at a preset included angle; One end of the belt wheel assembly abuts against the second cam disc, so that during the rotation of the second cam disc, the belt wheel assembly is pushed to drive the swing pin assembly to swing.

[0009] Optionally, the outer peripheral edge of the second cam disc includes a first arc portion and a second arc portion, and an inclined surface transition portion arranged between the first arc portion and the second arc portion; The radius of the second arc portion is greater than the radius of the first arc portion, and a limiting groove is arranged at the position corresponding to the second arc portion; The disc assembly further includes a limiting plate. A limiting wheel is arranged at one end of the limiting plate, and the limiting wheel is received in the limiting groove. When the limiting wheel abuts against any end of the limiting groove, the second cam disc is limited.

[0010] Optionally, the belt wheel assembly includes a first connecting block. The first end of the first connecting block is connected to the driving shaft. A first connecting column is arranged in the middle of the first connecting block. A second runner is arranged at the second end of the first connecting block, and the second runner abuts against the second cam disc; A second connecting column is arranged at a preset position of the main disc, and the first connecting column and the second connecting column are connected by a return spring.

[0011] Optionally, the swing pin assembly includes a second connecting block rotatably connected to the driving shaft. The second connecting block is provided with a baffle portion, and a movable plate is provided opposite to the baffle portion. A buffer spring is provided between the movable plate and the baffle portion; One end of the movable plate is provided with a swing pin rod, and an arc portion is provided at the end of the swing pin rod away from the movable plate. The arc portion is used to tightly press against the inner wall of the workpiece to be clamped.

[0012] Optionally, a third connecting block is provided on one side of the second connecting block. The third connecting block is provided with a guiding groove along the tangent direction of the driving shaft; The movable plate includes a first connecting portion and a second connecting portion arranged vertically, and a bending portion is provided between the first connecting portion and the second connecting portion; The second connecting portion is slidably connected in the guiding groove, and the second connecting portion is fixedly connected to the swing pin rod.

[0013] Optionally, a plurality of air blowing assemblies are further provided along the circumferential direction of the disc assembly. The air blowing assembly includes a first clamping block and a second clamping block which are detachably connected. An installation notch is formed between the first clamping block and the second clamping block. A blow pipe is installed in the installation notch, and one end of the blow pipe is provided with a trachea assembly; Wherein, a plurality of air blowing holes are formed along the length direction of the blow pipe for blowing air against the inner wall of the workpiece to be clamped.

[0014] Optionally, the air blowing assembly further includes an adjusting plate, and the first clamping block is connected to the adjusting plate; The adjusting plate is provided with an arc-shaped adjusting hole, and an adjusting bolt is accommodated in the adjusting hole. One end of the adjusting bolt is threadedly connected to the main disc. By adjusting the adjusting bolt, the angle of the adjusting plate can be adjusted.

[0015] Optionally, the driving shaft of the hydraulic driving mechanism is provided with a toothed portion. A through hole is formed at the central position of the disc assembly, and a toothed groove is provided at a preset position of the through hole. The first cam disc is meshed and connected to the driving shaft through the toothed groove.

[0016] Compared with the prior art, the present invention has the following beneficial effects: During operation, the hydraulic drive mechanism operates to drive the drive shaft to drive the first cam disk to rotate. During the rotation of the first cam disk, it remains in contact with the first runner of each set of clamping components respectively. When the first cam disk is rotated to a preset angle, the first runner of one of the sets of clamping components abuts against the pointed convex part, causing the first cam disk to be lifted to a preset height. At the first height difference, the outer arc surface and the inner cutting surface of different sets of clamping components respectively abut against the inner and outer wall surfaces of the workpiece to be clamped, and the clamping spring provides the clamping force to achieve the clamping operation. Through the linkage design of the cam disk and multiple sets of clamping components, the present device realizes synchronous and adaptive clamping of the inner and outer walls, has the advantages of compact structure, uniform and stable clamping force, and being adaptable to workpieces with different wall thicknesses. At the same time, the flexible pressure plate ensures that the surface of the workpiece is not damaged during the clamping process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] The structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the limited conditions under which the present invention can be implemented. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention.

[0019] Figure 1 It is a schematic diagram of the overall structure of the hydraulic drive clamping device of this embodiment; Figure 2 It is a front view structure schematic diagram of the clamping mechanism of the hydraulic drive clamping device of this embodiment; Figure 3 It is an axonometric view structure schematic diagram of the clamping mechanism of the hydraulic drive clamping device of this embodiment; Figure 4 It is a structure schematic diagram of the clamping component and the disk component of the hydraulic drive clamping device of this embodiment; Figure 5 It is a structure schematic diagram of a single set of clamping component and the circle-expanding component of the hydraulic drive clamping device of this embodiment; Figure 6 It is a structure schematic diagram of the clamping component of the hydraulic drive clamping device of this embodiment; Figure 7Schematic diagram of the circular expansion component of the hydraulic drive clamping device in this embodiment; Figure 8 Schematic diagram of the swing pin component of the hydraulic drive clamping device in this embodiment.

[0020] Illustration: Hydraulic drive mechanism 10, drive shaft 11, through hole 12, tooth-shaped groove 13; Disc assembly 20, main disc 21, first cam disc 22, flange portion 221, pointed convex portion 222, second cam disc 23, bushing 24, limit plate 25, first arc portion 231, second arc portion 232, inclined surface transition portion 233, limit groove 234; Clamping assembly 30, linkage block 31, first runner 32, clamping convex block 33, clamping spring 34, outer arc surface 331, inner cut surface 332, flexible pressure plate 35, mounting block 36, sliding groove 361; Circular expansion component 40, driving shaft 41, pulley assembly 42, swing pin component 43, first connection block 421, first connection column 422, second runner 423, return spring 424, second connection block 431, baffle portion 432, movable plate 433, buffer spring 434, swing pin rod 435, arc portion 4351, third connection block 436, guide groove 4361, first connection portion 4331, bending portion 4332; Blowing assembly 50, first clamping block 51, second clamping block 52, blowing pipe 53, pipe assembly 54, blowing hole 531, adjusting plate 55, adjusting hole 551, adjusting bolt 552. Detailed implementation manners

[0021] To make the invention objectives, features, and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the embodiments described below are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there may be an intermediate component present at the same time.

[0023] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0024] Combined with Figures 1 to 8 As shown, an embodiment of the present invention provides a hydraulic drive clamping device, which includes a hydraulic drive mechanism 10. A drive shaft 11 of the hydraulic drive mechanism 10 is connected to a clamping mechanism. The clamping mechanism includes a disc assembly 20 and a plurality of clamping assemblies 30 arranged along the circumferential direction of the disc assembly 20.

[0025] It should be noted that the hydraulic drive clamping device adopts a modular linkage design. With the hydraulic drive mechanism 10 as the core power source, power is transmitted to the disc assembly 20 of the clamping mechanism through the drive shaft 11. The clamping mechanism innovatively adopts a combined structure of a main disc 21 and a first cam disc 22. A plurality of clamping assemblies 30 evenly distributed along the circumference of the main disc 21 form an annular clamping array, which is particularly suitable for the axial conveying and clamping requirements of round tube-like workpieces. The linear thrust of the hydraulic system is converted into a radial clamping action through a cam mechanism, which not only maintains the strong characteristics of hydraulic transmission but also realizes a space-intensive layout. This structure enables the workpiece to be synchronously clamped and fixed during axial conveying, solving the technical bottleneck that traditional fixtures need to pause for positioning.

[0026] The disc assembly 20 includes a main disc 21 and a first cam disc 22 coaxially arranged with the drive shaft 11. The first cam disc 22 has a flange portion 221 and a pointed convex portion 222. The pointed convex portion 222 and the flange portion 221 have a first height difference D, and the first height difference D is adapted to the wall thickness of the workpiece to be clamped. The disc assembly 20 realizes motion decoupling through a static-dynamic separation design. The main disc 21 serves as a fixed reference platform, and the first cam disc 22 coaxially arranged with the hydraulic drive shaft 11 constitutes a rotating execution unit. The flange portion 221 and the pointed convex portion 222 of the cam disc form a stepped contour, and its first height difference is calculated to form a matching relationship with the wall thickness of the workpiece to be clamped. When the hydraulic drive shaft 11 drives the first cam disc 22 to rotate, the pointed convex portion 222 serves as a phase trigger mechanism, generating a displacement mutation at a specific angular position. This asymmetric cam contour design enables the clamping action to have clear timing control, and the two work together to provide precise motion trajectory control for multi-station clamping.

[0027] The clamping assembly 30 includes a linkage block 31 slidably connected along the diameter direction of the main disc 21. A first runner 32 is provided at the first end of the linkage block 31, and the first runner 32 abuts against the outer peripheral edge of the first cam disc 22.

[0028] The second end of the linkage block 31 is provided with a clamping convex block 33, and a clamping spring 34 is arranged between the linkage block 31 and the clamping convex block 33. An outer arc surface 331 and an inner cutting surface 332 are oppositely arranged on the clamping convex block 33, and a flexible pressing plate 35 is arranged on the inner cutting surface 332. Among them, the length of the clamping spring 34 is specially designed, and the length L1 of its natural state needs to satisfy being greater than the length L2 of the spring accommodating groove of the linkage block 31, but L1 is less than the sum of L2 and the first height difference D. When the clamping convex block 33 is pushed out to the outside, by continuously rotating the first cam disc 22, the clamping spring 34 generates an acting force inward to clamp the workpiece.

[0029] The core of the clamping assembly 30 lies in a three-way mechanical force transmission system: the linkage block 31 forms a linear guide along the radial slide rail of the main disc 21, and the first runner 32 serves as a cam follower to convert the rotational motion into linear displacement; the clamping convex block 33 forms an elastic connection with the linkage block 31 through the clamping spring 34, constituting a two-stage force transmission mechanism. The specially designed double-acting clamping spring 34 generates reverse balancing forces simultaneously during the clamping process - when the inner clamping assembly 30 is pushed by the cam and expands outward, the spring generates an inward restoring force; when the outer clamping assembly 30 is driven by the cam and contracts inward, the spring provides an outward tension force. Cooperating with the outer arc surface 331 guiding structure and the inner cutting surface 332 flexible pressing plate 35 of the clamping convex block 33, an adaptive "inner and outer clamp" effect is formed, which not only ensures the uniform distribution of the clamping force but also eliminates local stress concentration through the flexible contact surface.

[0030] During the operation of the device, the hydraulic drive shaft 11 drives the first cam disc 22 to rotate intermittently. When the first runner 32 of a specific clamping assembly 30 enters the action area of the pointed convex part 222, the linkage block 31 generates a sudden change in radial displacement driven by the height difference. At this time, the inner and outer two groups of clamping assemblies 30 respectively form a composite clamping mode of "core expansion" and "outer hoop contraction" under the action of the spring, and clamping forces that are precisely matched with the wall thickness of the workpiece are simultaneously generated on the inner and outer walls. This innovative structure breaks through the limitation of traditional single-sided clamping, realizes the coordinated action of multiple clamping units through cam phase control, and the clamping force is automatically adjusted according to the workpiece size and is evenly distributed. The combination of the flexible pressing plate 35 and the elastic force transmission system achieves the dual effects of "rigid clamping and flexible contact" while ensuring the clamping rigidity, and is particularly suitable for the processing scenario of thin-walled pipe fittings with high surface finish requirements.

[0031] The working principle of the present invention is as follows: during operation, the hydraulic driving mechanism 10 operates to drive the driving shaft 11 to drive the first cam disk 22 to rotate. During the rotation of the first cam disk 22, it remains in contact with the first runner 32 of each clamping assembly 30 respectively. When the first cam disk 22 is rotated to a preset angle, the first runner 32 of one of the clamping assemblies 30 abuts against the pointed convex part 222, causing the first cam disk 22 to be lifted to a preset height. At the first height difference, the outer arc surface 331 and the inner cutting surface 332 of different groups of clamping assemblies 30 are respectively in contact with the inner and outer wall surfaces of the workpiece to be clamped, and the clamping force is provided by the clamping spring 34 to achieve the clamping operation. Through the linkage design of the cam disk and multiple groups of clamping assemblies 30, the present device realizes synchronous and adaptive clamping of the inner and outer walls, has the advantages of compact structure, uniform and stable clamping force, and being suitable for workpieces with different wall thicknesses. At the same time, the flexible pressing plate 35 ensures that the surface of the workpiece is not damaged during the clamping process.

[0032] In this embodiment, specifically, the clamping assembly 30 further includes a mounting block 36 provided on the main disk 21. A sliding groove 361 is formed in the middle of the mounting block 36 along the diameter direction of the main disk 21, and the linkage block 31 is slidably connected to the sliding groove 361; an elastic member (not shown in the figure) is provided on the mounting block 36. One end of the elastic member is connected to the linkage block 31, and the elastic member is used to push the linkage block 31 to move towards the center of the main disk 21.

[0033] It should be noted that the mounting block 36 of the clamping assembly 30 provides precise radial guidance for the linkage block 31 through the middle sliding groove 361. When the linkage block 31 slides in the sliding groove 361 along the diameter direction of the main disk 21, the elastic member (such as the return spring 424) on the mounting block 36 continuously pushes the linkage block 31 to move towards the center. When the pointed convex part 222 of the first cam disk 22 pushes the linkage block 31 to displace outward, the clamping spring 34 is compressed. At this time, the pre-tightening force of the elastic member and the clamping spring 34 form a composite acting force: on the one hand, the elastic member ensures that the first runner 32 always fits the contour of the cam disk to avoid movement interference; on the other hand, when the clamping convex block 33 moves to the outside of the workpiece, the elastic member applies an inward balancing force through the linkage block 31 to form a dynamic balance with the outward pushing force of the clamping spring 34.

[0034] This design enhances the movement stability of the clamping assembly 30 through the dual guiding and limiting mechanisms of the sliding groove 361 and the elastic member, and prevents radial movement deviation. The synergistic effect of the elastic member and the clamping spring 34 realizes the self-adjustment of the clamping force - not only ensuring the reliable contact between the clamping convex block 33 and the workpiece to be clamped, but also eliminating the impact caused by the workpiece size error through elastic compensation. In addition, the continuous application of the centripetal pre-tightening force effectively reduces the vibration noise during the rotation of the cam disk and extends the service life of the mechanism.

[0035] In this embodiment, specifically, a plurality of circular expanding assemblies 40 are further provided along the circumferential direction of the disk assembly 20. The disk assembly 20 further includes a second cam disk 23 coaxially arranged with the drive shaft 11, and a bushing 24 arranged on the main disk 21. The circular expanding assembly 40 includes a driving shaft 41, the driving shaft 41 is rotatably connected within the bushing 24, and both ends thereof penetrate through the main disk 21 respectively. A pulley assembly 42 is connected to the first end of the driving shaft 41, and a swing pin assembly 43 is connected to the second end of the driving shaft 41, wherein the pulley assembly 42 and the swing pin assembly 43 are arranged at a preset angle; one end of the pulley assembly 42 abuts against the second cam disk 23, so that during the rotation of the second cam disk 23, the pulley assembly 42 is pushed to drive the swing pin assembly 43 to swing.

[0036] It should be noted that the driving shaft 41 of the circular expanding assembly 40 forms a rotating pair with the main disk 21 through the bushing 24. When the drive shaft 11 drives the second cam disk 23 to rotate, the pulley assembly 42 swings with the change of the cam profile. Since the pulley assembly 42 and the swing pin assembly 43 are arranged at a preset angle, the radial swing of the pulley assembly 42 is converted into the tangential swing of the swing pin assembly 43 through the driving shaft 41. When the convex part of the second cam disk 23 pushes the pulley assembly 42 to displace outward, the swing pin assembly 43 expands outward synchronously, and the arc-shaped surface at its end fits the inner wall of the workpiece for circularity correction operation; when the cam rotates to the concave part, the swing pin assembly 43 retracts under the action of the reset mechanism.

[0037] Through the spatial angle conversion design, the circular expanding assembly 40 converts the radial movement of the cam into the tangential expansion action of the swing pin, realizing multi-point flexible regularization of the inner wall of the circular tube. The setting of the preset angle makes the swing direction of the swing pin form a mechanical complement with the clamping force direction, effectively offsetting the elliptical deformation caused by clamping. The time-sharing expansion mechanism (only part of the swing pins work synchronously) avoids the overconstraint problem caused by full circumferential pressure.

[0038] In this embodiment, further, the outer peripheral edge of the second cam disk 23 includes a first arc portion 231 and a second arc portion 232, and an inclined surface transition portion 233 arranged between the first arc portion 231 and the second arc portion 232; the radius of the second arc portion 232 is greater than that of the first arc portion 231, and a limiting groove 234 is arranged at the corresponding position of the second arc portion 232; the disk assembly 20 further includes a limiting plate 25, one end of the limiting plate 25 is provided with a limiting wheel, and the limiting wheel is received in the limiting groove 234. When the limiting wheel abuts against any end of the limiting groove 234, the second cam disk 23 is limited.

[0039] It should be understood that the first arc portion 231 (reference contour) and the second arc portion 232 (working contour) of the second cam disc 23 are smoothly transitioned through an inclined surface. When the limiting wheel of the limiting plate 25 is inserted into the limiting groove 234, the second cam disc 23 is locked at a preset angle. At this time, only the pulley assembly 42 of the partial circle-expanding assembly 40 contacts the second arc portion 232, pushing the corresponding swing pin to expand. As the drive shaft 11 continues to rotate, when the limiting wheel slides along the limiting groove 234 to the other end, the second cam disc 23 switches to a new phase, and another group of swing pins starts to work. The inclined surface transition portion 233 provides buffering during the phase switch, ensuring the coherence of the swing pin expansion action.

[0040] The cooperation between the double-arc contour and the limiting groove 234 realizes the timing control of the circle-expanding action, avoiding excessive instantaneous load through segmented circle expansion. The limiting mechanism controls the rotation angle of the second cam disc 23, which not only ensures the effective expansion stroke of the swing pin but also prevents the mechanism from jamming caused by excessive rotation.

[0041] In this embodiment, it is further illustrated that the pulley assembly 42 includes a first connecting block 421. The first end of the first connecting block 421 is connected to the driving shaft 41. A first connecting column 422 is provided in the middle of the first connecting block 421. A second runner 423 is provided at the second end of the first connecting block 421. The second runner 423 abuts against the second cam disc 23. A second connecting column is provided at a preset position of the main disc 21. The first connecting column 422 and the second connecting column are connected by a return spring 424.

[0042] It should be noted that the pulley assembly 42 realizes power transmission and motion conversion through the first connecting block 421. The first connecting block 421 is connected to the driving shaft 41 in an oblique structure. The second runner 423 at its second end maintains rolling contact with the second cam disc 23. When the second cam disc 23 rotates, the second runner 423 rolls along its contour, pushing the first connecting block 421 to swing around the driving shaft 41. At this time, the return spring 424 between the first connecting column 422 and the second connecting column on the main disc 21 is stretched or compressed, forming an elastic restoring force. The obliquely designed first connecting block 421 decomposes the radial thrust of the second cam disc 23 into the tangential component force of the driving shaft 41 and the axial component force of the return spring 424, thereby converting the rotational motion of the cam disc into the reciprocating swing of the driving shaft 41.

[0043] In this embodiment, specifically, the swing pin assembly 43 includes a second connecting block 431 rotatably connected to the driving shaft 41. The second connecting block 431 is provided with a baffle portion 432. An active plate 433 is provided opposite to the baffle portion 432. A buffer spring 434 is provided between the active plate 433 and the baffle portion 432. One end of the active plate 433 is provided with a swing pin rod 435. An arc portion 4351 is provided at the end of the swing pin rod 435 away from the active plate 433. The arc portion 4351 is used to tightly press against the inner wall of the workpiece to be clamped.

[0044] Further, the second connecting block 431 of the swing pin assembly 43 is hinged to the driving shaft 41. When the driving shaft 41 swings, the active plate 433 slides along the guiding groove 4361 through the second connecting portion. When the arc portion 4351 of the swing pin rod 435 contacts the inner wall of the workpiece, the reaction force of the workpiece pushes the active plate 433 towards the baffle portion 432, compressing the buffer spring 434. The compression stroke of the buffer spring 434 forms a dynamic balance with the local deformation amount of the inner wall of the workpiece. When the swing pin rod 435 disengages from the contact, the buffer spring 434 pushes the active plate 433 to reset. The composite buffering mechanism of the buffer spring 434 and the active plate 433 endows the circular expansion action of the swing pin rod 435 with the dual characteristics of "rigid drive + flexible contact".

[0045] In this embodiment, specifically, a third connecting block 436 is provided on one side of the second connecting block 431. The third connecting block 436 is provided with a guiding groove 4361 along the tangent direction of the driving shaft 41. The active plate 433 includes a first connecting portion 4331 and a second connecting portion arranged vertically. A bending portion 4332 is provided between the first connecting portion 4331 and the second connecting portion. The second connecting portion is slidably connected in the guiding groove 4361, and the second connecting portion is fixedly connected to the swing pin rod 435.

[0046] The guiding of the active plate 433 is realized through the design that the active plate 433 is connected to the buffer spring 434 through the first connecting portion 4331 and the second connecting portion slides along the guiding groove 4361. When the driving shaft 41 swings, the second connecting portion slides along the tangent direction in the guiding groove 4361, forcing the bending portion 4332 to generate an elastic deformation that matches the arc of the driving shaft 41. At this time, the variation amount of the distance between the first connecting portion 4331 and the baffle portion 432 is the compression amount of the buffer spring 434. The contact pressure of the arc portion 4351 of the swing pin rod 435 is proportional to the spring compression force. The linear constraint of the guiding groove 4361 ensures that the second connecting portion only moves along the set direction, avoiding the circumferential offset of the swing pin rod 435.

[0047] In this embodiment, as a preferred option, a plurality of blowing assemblies 50 are further provided along the circumferential direction of the disc assembly 20. The blowing assembly 50 includes a first clamping block 51 and a second clamping block 52 that are detachably connected. An installation notch is formed between the first clamping block 51 and the second clamping block 52. A blowing pipe 53 is installed in the installation notch. One end of the blowing pipe 53 is provided with a trachea assembly 54. Among them, a plurality of blowing holes 531 are formed along the length direction of the blowing pipe 53 for blowing air on the inner wall of the clamped part.

[0048] The blowing assembly 50 is fixed to the circumference of the main disc 21 through the detachable first clamping block 51 and the second clamping block 52. After the blowing pipe 53 is radially inserted into the installation notch, it is supplied with air by the trachea assembly 54. Compressed air is ejected from a plurality of blowing holes distributed along the length direction of the blowing pipe 53 to form an annular air flow covering the inner wall of the clamped part. When the workpiece is clamped and positioned, the blowing assembly 50 is started synchronously, and the air flow spirally advances along the inner wall to remove debris or oil stains generated during the clamping process. The radial arrangement of the blowing pipe 53 makes the jet direction perpendicular to the axis of the workpiece, ensuring that the cleaning coverage has no dead corners.

[0049] In this embodiment, it is further explained that the blowing assembly 50 further includes an adjusting plate 55. The first clamping block 51 is connected to the adjusting plate 55. The adjusting plate 55 is provided with an arc-shaped adjusting hole 551. An adjusting bolt 552 is accommodated in the adjusting hole 551. One end of the adjusting bolt 552 is threadedly connected to the main disc 21. By adjusting the adjusting bolt 552, the angle of the adjusting plate 55 can be adjusted.

[0050] The adjusting plate 55 forms an angle-adjustable connection with the main disc 21 through the arc-shaped adjusting hole 551. When the adjusting bolt 552 is loosened, the adjusting plate 55 can rotate around the installation reference point, driving the blowing pipe 53 to deflect the angle synchronously. When the angle of the blowing pipe 53 adapts to the curvature of the inner wall of the workpiece, the adjusting bolt 552 is locked to fix the position.

[0051] In this embodiment, a toothed portion is provided on the driving shaft 11 of the hydraulic driving mechanism 10. A through hole 12 is opened at the central position of the disc assembly 20. A toothed groove 13 is provided at a preset position of the through hole 12. The first cam disc 22 is meshed and connected to the driving shaft 11 through the toothed groove 13.

[0052] The toothed portion of the hydraulic driving shaft 11 and the toothed groove 13 of the central through hole 12 of the first cam disc 22 form a precision meshing pair. When the hydraulic cylinder pushes the driving shaft 11 to move linearly, the toothed portion converts the axial thrust into the rotational torque of the first cam disc 22 through helical meshing. The design of the helix angle of the meshing pair makes the axial displacement and the cam rotation angle form a linear proportional relationship. During disassembly and maintenance, the driving shaft 11 can be axially pulled to quickly separate the toothed meshing.

[0053] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A hydraulic drive clamping device, characterized in that, It includes a hydraulic drive mechanism (10), and a clamping mechanism is connected to the drive shaft (11) of the hydraulic drive mechanism (10). The clamping mechanism includes a disc assembly (20) and multiple groups of clamping assemblies (30) arranged along the circumferential direction of the disc assembly (20); The disc assembly (20) includes a main disc (21) and a first cam disc (22) coaxially arranged with the drive shaft (11). The first cam disc (22) has a flange portion (221) and a pointed convex portion (222). There is a first height difference between the pointed convex portion (222) and the flange portion (221), and the first height difference is adapted to the wall thickness of the workpiece to be clamped; The clamping assembly (30) includes a linkage block (31) slidably connected along the diameter direction of the main disc (21). A first runner (32) is arranged at the first end of the linkage block (31), and the first runner (32) abuts against the outer peripheral edge of the first cam disc (22); A clamping convex block (33) is arranged at the second end of the linkage block (31), and a clamping spring (34) is arranged between the linkage block (31) and the clamping convex block (33). An outer arc surface (331) and an inner cutting surface (332) are oppositely arranged on the clamping convex block (33), and a flexible pressing plate (35) is arranged on the inner cutting surface (332).

2. The hydraulic drive clamping device according to claim 1, characterized in that, The clamping assembly (30) further includes a mounting block (36) arranged on the main disc (21). A sliding groove (361) is formed in the middle of the mounting block (36) along the diameter direction of the main disc (21), and the linkage block (31) is slidably connected to the sliding groove (361); An elastic member is arranged on the mounting block (36). One end of the elastic member is connected to the linkage block (31), and the elastic member is used to push the linkage block (31) to move towards the center of the main disc (21).

3. The hydraulic drive clamping device according to claim 2, characterized in that, Multiple groups of disc expanding assemblies (40) are further arranged along the circumferential direction of the disc assembly (20). The disc assembly (20) further includes a second cam disc (23) coaxially arranged with the drive shaft (11) and a bushing (24) arranged on the main disc (21); The disc expanding assembly (40) includes a driving shaft (41). The driving shaft (41) is rotatably connected in the bushing (24), and both ends of the driving shaft (41) penetrate through the main disc (21) respectively. A pulley assembly (42) is connected to the first end of the driving shaft (41), and a swing pin assembly (43) is connected to the second end of the driving shaft (41), wherein the pulley assembly (42) and the swing pin assembly (43) are arranged at a preset included angle; One end of the pulley assembly (42) abuts against the second cam disc (23), so that during the rotation of the second cam disc (23), the pulley assembly (42) is pushed to drive the swing pin assembly (43) to swing.

4. The hydraulic drive clamping device according to claim 3, characterized in that, The outer peripheral edge of the second cam disc (23) includes a first arc portion (231) and a second arc portion (232), and an inclined surface transition portion (233) arranged between the first arc portion (231) and the second arc portion (232); The radius of the second arc portion (232) is greater than that of the first arc portion (231), and a limiting groove (234) is provided at the corresponding position of the second arc portion (232); The disc assembly (20) further includes a limiting plate (25). One end of the limiting plate (25) is provided with a limiting wheel, and the limiting wheel is received in the limiting groove (234). When the limiting wheel abuts against any end of the limiting groove (234), the second cam disc (23) is limited.

5. The hydraulic drive clamping device according to claim 3, wherein, The pulley assembly (42) includes a first connecting block (421). The first end of the first connecting block (421) is connected to the driving shaft (41). A first connecting column (422) is provided in the middle of the first connecting block (421). The second end of the first connecting block (421) is provided with a second runner (423), and the second runner (423) abuts against the second cam disc (23); A second connecting column is provided at a preset position of the main disc (21), and the first connecting column (422) and the second connecting column are connected by a return spring (424).

6. The hydraulic drive clamping device according to claim 5, characterized in that, The swing pin assembly (43) includes a second connecting block (431) rotatably connected to the driving shaft (41). The second connecting block (431) is provided with a baffle portion (432). An activity plate (433) is provided opposite to the baffle portion (432), and a buffer spring (434) is provided between the activity plate (433) and the baffle portion (432); One end of the activity plate (433) is provided with a swing pin rod (435). The end of the swing pin rod (435) away from the activity plate (433) is provided with an arc portion (4351), and the arc portion (4351) is used to tightly press the inner wall of the workpiece to be clamped.

7. The hydraulic drive clamping device according to claim 6, characterized in that, One side portion of the second connecting block (431) is provided with a third connecting block (436), and a guiding groove (4361) is provided in the third connecting block (436) along the tangent direction of the driving shaft (41); The activity plate (433) includes a first connecting portion (4331) and a second connecting portion which are vertically arranged, and a bending portion (4332) is provided between the first connecting portion (4331) and the second connecting portion; The second connecting portion is slidably connected in the guiding groove (4361), and the second connecting portion is fixedly connected to the swing pin rod (435).

8. The hydraulic drive clamping device according to claim 1, characterized in that, The disc assembly (20) is further provided with a plurality of groups of air blowing assemblies (50) along its circumferential direction. The air blowing assembly (50) includes a first clamping block (51) and a second clamping block (52) which are detachably connected. An installation notch is formed between the first clamping block (51) and the second clamping block (52), and an air blowing pipe (53) is installed in the installation notch. One end of the air blowing pipe (53) is provided with a trachea assembly (54); Wherein, a plurality of air blowing holes (531) are formed in the air blowing pipe (53) along its length direction for blowing air into the inner wall of the workpiece to be clamped.

9. The hydraulic drive clamping device according to claim 8, characterized in that, The air blowing assembly (50) further includes an adjusting plate (55), and the first clamping block (51) is connected to the adjusting plate (55); The adjusting plate (55) is provided with an arc-shaped adjusting hole (551), an adjusting bolt (552) is disposed in the adjusting hole (551), one end of the adjusting bolt (552) is threadedly connected to the main disc (21), and by adjusting the adjusting bolt (552), the angle of the adjusting plate (55) is adjusted.

10. The hydraulic drive clamping device according to claim 1, characterized in that The drive shaft (11) of the hydraulic drive mechanism (10) is provided with a toothed portion, a through hole (12) is provided at the central position of the disc assembly (20), a toothed groove (13) is provided at a preset position of the through hole (12), and the first cam disc (22) is meshed and connected to the drive shaft (11) through the toothed groove (13).

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