Chuck rotation type out-of-round correction device for thin-wall cylinder barrel

Abstract

The invention discloses a chuck rotating type out-of-round correction device for a thin-wall cylinder barrel. The device comprises a deformation mechanism, a chuck rotating mechanism, a front supporting mechanism and a rear supporting mechanism. The deformation mechanism and the chuck rotating mechanism are both installed on the front supporting mechanism, and the front supporting mechanism and the rear supporting mechanism are sequentially arranged in a front-back spaced mode. The deformation mechanism is used for applying correction pressure to the thin-wall cylinder barrel, and the chuck rotating mechanism is used for clamping, measuring and adjusting the thin-wall cylinder barrel. According to the method, the size of the inner hole is accurately kept in the out-of-round correction process of the thin-wall cylinder barrel, and surface damage caused by a traditional rounding process is avoided. The machining efficiency is remarkably improved through an automatic measuring and positioning system, and the machining requirements of workpieces with different lengths can be met.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing equipment, in particular to a chuck rotary thin-wall cylinder out-of-round correction device. Background Art

[0002] As a key component of multi-stage hydraulic cylinders, thin-walled cylinder barrels require extremely high dimensional accuracy, form and position precision, and surface roughness. During machining, thin-walled barrels are prone to deformation due to their thin walls. This is particularly true after skiving and roller finishing, where the ports experience out-of-roundness, often exceeding roundness specifications. This out-of-round deformation can lead to a range of problems, including reduced sealing performance, increased wear, and increased operating vibration, seriously impacting the performance and lifespan of hydraulic systems.

[0003] In the existing technology, the steel pipe rounding device mainly uses three rollers to extrude the steel pipe into a round shape. This method has obvious defects: first, the rounding process will simultaneously change the inner and outer diameter dimensions of the steel pipe, and the thin-walled cylinder is a precision-machined part, and its inner hole size and surface roughness must remain stable; second, the existing device is difficult to adapt to the processing needs of workpieces of different lengths; third, it lacks an automated detection and control system and mainly relies on manual measurement and adjustment, which is inefficient and difficult to guarantee accuracy. Summary of the Invention

[0004] In view of this, the present invention provides a chuck-rotating thin-walled cylinder out-of-round correction device, which has the advantages of maintaining the stability of the inner hole size of the thin-walled cylinder, adapting to the processing requirements of workpieces of different lengths, and realizing automatic detection and adjustment control.

[0005] To achieve the above object, the present invention provides the following technical solutions: A chuck rotating thin-wall cylinder out-of-round correction device comprises a deformation mechanism, a chuck rotating mechanism, a front supporting mechanism and a rear supporting mechanism.

[0006] Among them, the deformation mechanism and the chuck rotation mechanism are both installed on the front support mechanism, and the front support mechanism and the rear support mechanism are arranged in sequence with a front-to-back spacing; the deformation mechanism is used to apply correction pressure to the thin-walled cylinder, and the chuck rotation mechanism is used for clamping, measuring and adjusting the thin-walled cylinder.

[0007] Preferably, the deformation mechanism includes a first electric push rod, a push rod support frame, a top plate, a connecting block, a pressure block, a sliding rod and a bottom plate, the top plate is connected to the bottom plate through a sliding rod, the first electric push rod can be movably installed on the push rod support frame up and down, the push rod support frame is fixedly connected to the top plate, a through hole is opened on the top plate, the first electric push rod passes through the through hole and is fixedly connected to the pressure block through the connecting block, and the pressure block is slidably assembled on the sliding rod.

[0008] Preferably, a V-shaped groove is provided on the bottom plate.

[0009] Preferably, the chuck rotation mechanism includes a chuck assembly, a laser ranging assembly, a telescopic rod, a first motor, a first fixed plate, a slider, a large gear, a second fixed plate, a second electric push rod, a small gear and a connecting plate; the chuck assembly and the large gear are fixed to the first fixed plate through bearings, the first motor is mounted on the first fixed plate, the motor shaft of the first motor passes through the first fixed plate, the small gear is mounted on the motor shaft, and the small gear is meshed with the large gear; the second fixed plate is mounted on the first fixed plate by bolt connection, the second electric push rod is fixed on the second fixed plate, the telescopic rod is fixed on the second electric push rod, and the laser ranging assembly is fixed on the telescopic rod; the slider and the connecting plate are both mounted on the first fixed plate.

[0010] Preferably, the front support mechanism includes a first base, a universal wheel assembly, a second motor, a slide rail and a screw assembly; the universal wheel assembly is installed at the bottom of the first base, the slide rail is installed on the first base, the slide rail is connected to the first fixed plate through the slider, the motor shaft of the second motor is connected to the screw assembly and fixed on the first base, and the screw assembly is connected to the first fixed plate through the connecting plate.

[0011] Preferably, the rear support mechanism includes a second base, a third fixed plate, a movable plate and a spring; the third fixed plate is mounted on the second base, and the movable plate is connected to the third fixed plate via the spring.

[0012] Preferably, the third fixed plate, the movable plate and the spring constitute a group of clamping devices, and two groups of the clamping devices are provided. The two groups of the clamping devices are symmetrically arranged on the second base.

[0013] The beneficial effects of this invention are as follows: Compared with existing technologies, this application achieves precise maintenance of the inner bore dimensions during the out-of-round correction process for thin-walled cylinders, avoiding surface damage caused by traditional rounding processes. The automated measurement and positioning system significantly improves processing efficiency and can adapt to the processing needs of workpieces of varying lengths.

[0014] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the chuck rotary thin-wall cylinder out-of-round correction device of the present invention; Figure 2It is a structural schematic diagram of the deformation mechanism of the present invention; Figure 3 It is a structural schematic diagram of the chuck rotating mechanism of the present invention; Figure 4 It is a structural schematic diagram of the front support mechanism of the present invention; Figure 5 It is a structural schematic diagram of the rear support mechanism of the present invention.

[0016] Reference numerals: 1. Deformation mechanism; 11. First electric push rod; 12. Top plate; 13. Pressing block; 14. Sliding rod; 15. Connecting block; 16. Bottom plate; 17. Push rod support frame; 2. Chuck rotation mechanism; 201. Chuck assembly; 202. Laser ranging assembly; 203. Telescopic rod; 204. First motor; 205. First fixed plate; 206. Slider; 207. Large gear; 208. Second fixed plate; 209. Second electric push rod; 210. Small gear; 211. Connecting plate; 3. Front support mechanism; 31. First base; 32. Universal wheel assembly; 33. Second motor; 34. Slide rail; 35. Screw assembly; 4. Rear support mechanism; 41. Spring; 42. Moving plate; 43. Third fixed plate; 44. Second base; 5. Thin-walled cylinder. DETAILED DESCRIPTION

[0017] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0018] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0019] Reference below Figures 1 to 5 The invention describes a chuck rotary thin-wall cylinder out-of-round correction device in an embodiment of the invention.

[0020] The embodiment of the present application discloses a chuck rotation type thin-wall cylinder out-of-round correction device, comprising: a deformation mechanism 1, a chuck rotation mechanism 2, a front support mechanism 3 and a rear support mechanism 4.

[0021] Among them, the deformation mechanism 1 and the chuck rotation mechanism 2 are both installed on the front support mechanism 3, and the front support mechanism 3 and the rear support mechanism 4 are arranged in a front-to-back order; the deformation mechanism 1 is used to apply correction pressure to the thin-walled cylinder 5, and the chuck rotation mechanism 2 is used for clamping, measuring and adjusting the thin-walled cylinder 5.

[0022] The deformation mechanism 1 is a component that achieves plastic deformation of the workpiece by applying vertical force. The chuck rotation mechanism 2 combines clamping and positioning with rotational measurement, ensuring accurate workpiece axis positioning through synchronized clamping of the jaws. The front support mechanism 3 is the base platform supporting the main functional modules. The rear support mechanism 4 is an auxiliary device that provides axial positioning.

[0023] Specifically, the chuck assembly 201 clamps the two ends of the cylinder barrel to establish a unified machining datum, while the laser ranging assembly 202 scans the inner hole contour data along with the rotating mechanism. After detecting the orientation of the ellipse's major axis, the workpiece is adjusted so that the major axis is vertical. The deformation mechanism 1 moves downward to contact the workpiece, applying vertical pressure according to preset parameters. The entire process is coordinated by the control system, achieving roundness correction while maintaining the original inner hole dimensions.

[0024] Compared to existing technologies, traditional rounding devices use a three-point extrusion method to change the inner and outer diameters of workpieces. This solution, however, achieves localized plastic deformation through single-point, directional pressure, effectively maintaining internal hole machining accuracy. While existing technologies require manual measurement and adjustment of workpiece position, this solution integrates laser measurement and an automatic rotation mechanism for closed-loop control. Traditional devices lack adjustable support height, while this solution utilizes a 34-screw mechanism with a slide rail to accommodate workpieces of varying sizes, expanding the device's applicability.

[0025] Through the above technical solution, the present application achieves precise maintenance of the inner hole size during the out-of-round correction process of the thin-walled cylinder 5, avoiding the surface damage caused by traditional rounding processes. The automated measurement and positioning system significantly improves processing efficiency and can adapt to the processing requirements of workpieces of different lengths.

[0026] In some embodiments, for example Figure 2 As shown, the deformation mechanism 1 includes a first electric push rod 11, a push rod support frame 17, a top plate 12, a connecting block 15, a pressure block 13, a slide bar 14, and a bottom plate 16. The top plate 12 is connected to the bottom plate 16 via the slide bar 14. The first electric push rod 11 is mounted on the push rod support frame 17 so as to be movable up and down. The push rod support frame 17 is fixedly connected to the top plate 12. A through hole is provided on the top plate 12. The first electric push rod 11 passes through the through hole and is fixedly connected to the pressure block 13 via the connecting block 15. The pressure block 13 is slidably assembled on the slide bar 14. A V-shaped groove is provided on the bottom plate 16.

[0027] The slide bar 14 is a rigid guide component connecting the top plate 12 and the bottom plate 16, which is used to constrain the movement trajectory of the pressure block 13. The push rod support frame 17 is a mounting base fixed to the top plate 12, which is used to maintain the vertical movement axis of the first electric push rod 11. The V-shaped groove is a positioning structure provided on the surface of the bottom plate 16, which is used to limit the lateral displacement of the thin-walled cylinder 5.

[0028] Specifically, the top plate 12 and the bottom plate 16 form a stable rectangular frame structure through two sliding rods 14, and the two ends of the sliding rods 14 are fixed by threaded connections. The first electric push rod 11 is vertically installed inside the push rod support frame 17, and its output end is rigidly connected to the connecting block 15 after passing through the through hole of the top plate 12. The pressure block 13 is mounted on the sliding rod 14 through a linear bearing sleeve, and is driven by the connecting block 15 to perform vertical lifting and lowering movements along the sliding rod 14. When the first electric push rod 11 is started, the pressure block 13 moves downward along the sliding rod 14 to apply vertical correction pressure to the thin-walled cylinder 5. The guiding effect of the sliding rod 14 enables the pressure block 13 to always maintain a vertical motion trajectory. The V-shaped groove of the bottom plate 16 forms two-point contact with the outer wall of the thin-walled cylinder 5, and simultaneously limits the lateral displacement of the cylinder during the pressure application process to avoid positioning deviation caused by lateral sliding.

[0029] Through the above technical solution, the present application realizes the precise axial pressure correction of the thin-walled cylinder 5. The synergistic effect of the slide rod 14 and the V-shaped groove effectively suppresses the lateral displacement of the workpiece during the correction process. The closed-loop control of the electric push rod ensures the precise adjustment of the correction amount, and the original size and surface quality of the inner hole are completely maintained in the process of restoring the roundness.

[0030] In some embodiments, for example Figure 3 As shown, the chuck rotation mechanism 2 includes a chuck assembly 201, a laser ranging assembly 202, a telescopic rod 203, a first motor 204, a first fixed plate 205, a slider 206, a large gear 207, a second fixed plate 208, a second electric push rod 209, a small gear 210 and a connecting plate 211; the chuck assembly 201 and the large gear 207 are fixed to the first fixed plate 205 through bearings, the first motor 204 is mounted on the first fixed plate 205, the motor shaft of the first motor 204 passes through the first fixed plate 205, the small gear 210 is mounted on the motor shaft, and the small gear 210 is gear-engaged with the large gear 207; the second fixed plate 208 is mounted on the first fixed plate 205 by bolts, the second electric push rod 209 is fixed to the second fixed plate 208, the telescopic rod 203 is fixed to the second electric push rod 209, and the laser ranging assembly 202 is fixed to the telescopic rod 203; the slider 206 and the connecting plate 211 are both mounted on the first fixed plate 205.

[0031] Chuck assembly 201 and large gear 207 utilize a coaxial bearing mounting structure to ensure the coaxiality of the clamping center and the rotation axis. A first motor 204 drives a small gear 210, which in turn drives large gear 207, achieving low-speed, precise rotation of chuck assembly 201. The radial position of laser ranging assembly 202 is controlled by the telescopic motion of a second electric push rod 209.

[0032] Specifically, after the chuck assembly 201 clamps the thin-walled cylinder 5 through the claws, the first motor 204 drives the small gear 210 to drive the large gear 207 to rotate, so that the chuck assembly 201 rotates around the axis at a set speed. The second electric push rod 209 pushes the telescopic rod 203 to move radially, driving the laser ranging assembly 202 to reach a measuring position that maintains a preset distance from the inner wall of the thin-walled cylinder 5. During one rotation of the chuck assembly 201, the laser ranging assembly 202 continuously collects the inner wall contour data and identifies the orientation of the major axis of the ellipse through the control system. The chuck assembly 201 then rotates to adjust the orientation of the workpiece so that the major axis of the ellipse is in the vertical direction. The matching structure of the slider 206 and the slide rail 34 allows the entire chuck rotation mechanism 2 to move in the vertical direction. Combined with the self-locking characteristics of the screw assembly 35, the position of the mechanism is kept fixed when the power is off.

[0033] Compared with existing technologies, existing steel pipe rounding devices use a three-roller extrusion method, which results in variations in inner and outer diameters. This solution, however, uses non-contact laser ranging to detect inner hole roundness, avoiding surface damage caused by contact measurement. Existing technologies lack an axial positioning mechanism, which limits the processing of long workpieces. This solution, however, utilizes a combined structure of a chuck assembly 201 and a slide rail slider to achieve axial positioning and height adjustment of the workpiece. Existing devices rely on manual measurement and adjustment, while this solution achieves automated detection and correction processes through the coordinated control of gear transmission and electric push rods.

[0034] Through the above technical solution, the present application realizes the synchronous control of the clamping positioning and rotation detection of the thin-walled cylinder 5, adapts to the measurement requirements of workpieces of different diameters through the adjustable laser ranging component 202, uses the gear reduction mechanism to improve the rotation positioning accuracy, and combines the slide rail slider and the screw self-locking structure to ensure the operation safety and position stability of the mechanism, forming a closed-loop correction system.

[0035] In some embodiments, for example Figure 4 As shown, the front support mechanism 3 includes a first base 31, a universal wheel assembly 32, a second motor 33, a slide rail 34 and a screw assembly 35; the universal wheel assembly 32 is installed at the bottom of the first base 31, the slide rail 34 is installed on the first base 31, the slide rail 34 is connected to the first fixed plate 205 through the slider 206, the motor shaft of the second motor 33 is connected to the screw assembly 35 and fixed on the first base 31, and the screw assembly 35 is connected to the first fixed plate 205 through the connecting plate 211.

[0036] The second motor 33 is the power source for driving the screw assembly 35, and can be implemented as a servo motor. It is used to output precise rotational motion to control the linear displacement of the screw assembly 35. The connecting plate 211 is a transition component connecting the screw assembly 35 and the first fixed plate 205, and is used to transmit the linear displacement of the screw assembly 35 to the chuck rotation mechanism 2.

[0037] Specifically, when the second motor 33 drives the screw assembly 35 to rotate, the screw pair converts the rotational motion into linear motion, and drives the first fixed plate 205 to move vertically along the slide rail 34 through the connecting plate 211, thereby adjusting the height position of the chuck rotating mechanism 2. The cooperation between the slide rail 34 and the slider 206 ensures the straightness of the moving trajectory and adapts to the axial positioning requirements of thin-walled cylinders 5 with different diameters. When the second motor 33 stops supplying power, the self-locking feature of the screw assembly 35 automatically takes effect, preventing the mechanism from being displaced due to gravity or external forces, thereby avoiding safety accidents. The universal wheel assembly 32 releases the brake when the device needs to move, pushing the first base 31 to move as a whole; after positioning, the brake function is locked to keep the device stable.

[0038] Through the above technical solution, the present application realizes the automatic and precise adjustment of the axis height of the thin-walled cylinder 5 to meet the processing requirements of workpieces with different diameters; the self-locking function of the screw rod effectively prevents the mechanism from losing control due to power failure, thereby ensuring operational safety; the application of the universal wheel assembly 32 enables the device to have flexible movement capabilities and optimizes the equipment deployment efficiency.

[0039] In some embodiments, for example Figure 5 As shown, the rear support mechanism 4 includes a second base 44, a third fixed plate 43, a movable plate 42, and a spring 41. The third fixed plate 43 is mounted on the second base 44, and the movable plate 42 is connected to the third fixed plate 43 via the spring 41. The third fixed plate 43, movable plate 42, and spring 41 form a set of clamping devices. Two sets of clamping devices are provided and are symmetrically arranged on the second base 44.

[0040] The second base 44 is the foundational support component that supports the rear support mechanism 4 and serves to provide a rigid mounting base for the entire rear support mechanism 4. The third fixed plate 43 is a positioning component rigidly connected to the second base 44 and can be fixed with bolts to establish a stable clamping reference surface. The movable plate 42 is a movable clamping component that directly contacts the thin-walled cylinder 5 and forms a displaceable clamping surface under the action of the spring 41. The function of the spring 41 is to achieve elastic displacement of the movable plate 42 and maintain a constant clamping force.

[0041] Specifically, the third fixed plate 43 is fixed on the second base 44 by a rigid mounting method to form a reference support surface, and the movable plate 42 forms an elastic connection structure with the third fixed plate 43 through the spring 41. When the thin-walled cylinder 5 is placed between the two movable plates 42, the compression amount of the spring 41 is automatically adjusted according to the length of the cylinder, so that the movable plate 42 maintains contact with the end face of the cylinder but is not over-pressed. During the correction operation, the elastic deformation of the spring 41 can absorb the axial displacement of the thin-walled cylinder 5 caused by extrusion, while maintaining a stable clamping force. When the cylinder produces a slight deformation due to material rebound, the movable plate 42 follows the displacement under the action of the spring 41, avoiding stress concentration caused by rigid constraints. The two sets of symmetrically arranged clamping devices synchronously generate clamping force on both sides of the workpiece axis, forming a self-balancing constraint system.

[0042] This solution realizes the flexible adjustment of the axial clamping force through the structure of the movable plate 42 connected by the spring 41, which not only ensures the stable support of cylinders of different lengths, but also eliminates the risk of secondary deformation caused by rigid clamping. Compared with existing equipment using hydraulic or pneumatic clamping, the purely mechanical structure of the spring 41 mechanism has higher reliability and does not require an additional power source. The present application effectively solves the problem of support instability caused by length differences during the correction process of the thin-walled cylinder 5, and avoids secondary deformation caused by rigid constraints through the elastic clamping structure. The cooperation between the movable plate 42 and the spring 41 not only ensures the axial positioning accuracy of the workpiece, but also allows slight deformation during the correction process, ensuring the out-of-round correction effect while protecting the integrity of the processed surface.

[0043] Other structures and operations of the chuck rotary thin-wall cylinder out-of-round correction device according to the embodiment of the present invention are well known to ordinary technicians in this field and will not be described in detail here.

[0044] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0045] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A chuck rotary thin-wall cylinder out-of-round correction device, characterized in that: include: Deformation mechanism, chuck rotation mechanism, front support mechanism and rear support mechanism; The deformation mechanism and the chuck rotation mechanism are both installed on the front support mechanism, and the front support mechanism and the rear support mechanism are arranged in a front-to-back order; the deformation mechanism is used to apply correction pressure to the thin-walled cylinder, and the chuck rotation mechanism is used for clamping, measuring and adjusting the thin-walled cylinder.

2. The chuck rotary thin-wall cylinder out-of-round correction device according to claim 1, characterized in that: The deformation mechanism includes a first electric push rod, a push rod support frame, a top plate, a connecting block, a pressure block, a sliding rod and a bottom plate. The top plate is connected to the bottom plate through a sliding rod. The first electric push rod can be movably installed on the push rod support frame up and down. The push rod support frame is fixedly connected to the top plate. A through hole is opened on the top plate. The first electric push rod passes through the through hole and is fixedly connected to the pressure block through the connecting block. The pressure block is slidably assembled on the sliding rod.

3. The chuck rotary thin-wall cylinder out-of-round correction device according to claim 2, characterized in that: A V-shaped groove is provided on the bottom plate.

4. The chuck rotary thin-wall cylinder out-of-round correction device according to claim 1, characterized in that: The chuck rotating mechanism includes a chuck assembly, a laser ranging assembly, a telescopic rod, a first motor, a first fixed plate, a slider, a large gear, a second fixed plate, a second electric push rod, a small gear and a connecting plate; The chuck assembly and the large gear are fixed to the first fixed plate through bearings, the first motor is mounted on the first fixed plate, the motor shaft of the first motor passes through the first fixed plate, the small gear is mounted on the motor shaft, and the small gear is meshed with the large gear; The second fixing plate is mounted on the first fixing plate by bolt connection, the second electric push rod is fixed on the second fixing plate, the telescopic rod is fixed on the second electric push rod, and the laser ranging assembly is fixed on the telescopic rod; the slider and the connecting plate are both mounted on the first fixing plate.

5. The chuck rotary thin-wall cylinder out-of-round correction device according to claim 4, characterized in that: The front support mechanism includes a first base, a universal wheel assembly, a second motor, a slide rail and a screw assembly; The universal wheel assembly is installed at the bottom of the first base, the slide rail is installed on the first base, the slide rail is connected to the first fixed plate through the slider, the motor shaft of the second motor is connected to the screw assembly and fixed on the first base, and the screw assembly is connected to the first fixed plate through the connecting plate.

6. The chuck rotary thin-wall cylinder out-of-round correction device according to claim 1, characterized in that: The rear support mechanism includes a second base, a third fixed plate, a movable plate and a spring; the third fixed plate is installed on the second base, and the movable plate is connected to the third fixed plate through the spring.

7. The chuck rotary thin-wall cylinder out-of-round correction device according to claim 6, characterized in that: The third fixed plate, the movable plate and the spring constitute a set of clamping devices, and two sets of the clamping devices are provided. The two sets of the clamping devices are symmetrically arranged on the second base.

Images