Hydraulic clamping device of numerical control machine tool

Abstract

The invention relates to the technical field of machine tool accessories, and discloses a numerical control machine tool hydraulic clamping device which comprises a mounting frame and further comprises a first rotating disc rotationally connected to the mounting frame, a second rotating disc is arranged at one end of the first rotating disc, four first guide grooves are evenly formed in the first rotating disc and are arranged in a radial shape, and the first rotating disc is provided with a second guide groove. First guide blocks are slidably connected into the four first guide grooves in the length direction, and first clamping shafts are fixed to the ends, away from the second rotating disc, of the four first guide blocks. Four second guide grooves are evenly formed in the second rotating disc and are arranged in a radial mode. When the thin-wall pipe fitting is clamped, the four first clamping shafts and the four second clamping shafts form four clamping jaws, the four second clamping shafts have the supporting effect on the side wall of the thin-wall pipe fitting, the four first clamping shafts are matched with the four second clamping shafts to clamp the side wall of the thin-wall pipe fitting, and therefore the problem that the side wall of the thin-wall pipe fitting deforms due to stress when the thin-wall pipe fitting is clamped is avoided; and the clamping stability of the thin-wall pipe fitting is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of machine tool accessories, and particularly relates to a hydraulic clamping device for a numerical control machine tool. Background Art

[0002] When a numerical control machine tool processes a workpiece, the workpiece is generally fixed on a fixture, such as a three-jaw chuck fixture on the machine tool. The workpiece is clamped by the synchronous movement of three jaws towards or away from each other.

[0003] When the existing three-jaw chuck fixture works, it clamps the side wall of the workpiece. When it is necessary to perform numerical control machining on special-shaped workpieces such as thin-walled round pipes, thin-walled square pipes, thin-walled flange parts, and rectangular parts, the following problems exist: 1. The side wall of the thin-walled round pipe is thin. When clamping the side wall, it is easy to cause deformation of the clamping parts of thin-walled pipe fittings such as thin-walled round pipes and thin-walled square pipes, and it is easy to damage the thin-walled pipe fittings. Moreover, the clamping force between the deformed thin-walled pipe fittings and the jaws is small, and it is easy to fall off the clamping device during the machining process, posing a safety hazard. 2. Due to its small thickness (small height), the thin-walled flange part has a small clamping area on the side wall. When the three-jaw chuck fixture clamps the side wall of the thin-walled flange part, the clamping position has a large pressure, which is easy to cause deformation of the clamping position on the side wall of the thin-walled flange part, damaging the workpiece. Moreover, the deformation will cause the center position of the thin-walled flange part to shift, affecting the machining accuracy of the thin-walled flange part. 3. The existing three-jaw chuck fixture cannot clamp a rectangular part. Summary of the Invention

[0004] The purpose of the embodiment of the present invention is to provide a hydraulic clamping device for a numerical control machine tool, aiming to solve the problems that the three-jaw chuck fixture cannot clamp a rectangular part, and when clamping workpieces such as thin-walled pipe fittings and thin-walled flange parts, there are problems of damaging the workpiece and not clamping tightly.

[0005] The present invention is implemented as follows. A hydraulic clamping device for a numerical control machine tool includes a mounting frame, and further includes a first rotating disk rotatably connected to the mounting frame. One end of the first rotating disk is provided with a second rotating disk. Four first guiding grooves are uniformly arranged on the first rotating disk. The four first guiding grooves are arranged radially. A first guiding block is slidably connected along the length direction in each of the four first guiding grooves. One end of each of the four first guiding blocks away from the second rotating disk is fixed with a first clamping shaft. Four second guiding grooves are uniformly arranged on the second rotating disk. The four second guiding grooves are arranged radially. A second guiding block is slidably connected along the length direction in each of the four second guiding grooves. One end of each of the four second guiding blocks close to the first rotating disk is fixed with a second clamping shaft. A driving mechanism is arranged on the mounting frame. The driving mechanism is used to drive the four first guiding blocks to move synchronously towards or away from each other, and the driving mechanism is used to drive the four second guiding blocks to move synchronously towards or away from each other. An extension clamping sleeve is slidably connected to the ends of the first clamping shaft and the second clamping shaft, and the extension clamping sleeve is fixed to the first clamping shaft or the second clamping shaft by bolts.

[0006] Further technical solution: Four first avoiding grooves for avoiding the movement of the four first clamping shafts are arranged on the first rotating disk. Four second avoiding grooves for avoiding the movement of the four first guiding blocks are arranged on the second rotating disk. The second rotating disk is rotatably connected to one end of the first rotating disk, and the second rotating disk and the first rotating disk are fixedly connected by fastening bolts.

[0007] Further technical solution: The driving mechanism includes a guiding rod fixed at the center of the end of the second rotating disk away from the first rotating disk. A first guiding sleeve and a second guiding sleeve are slidably connected along the length direction on the guiding rod. Four first connecting rods are uniformly rotatably connected to the side wall of the first guiding sleeve. The ends of the four first connecting rods are respectively rotatably connected to the four second guiding blocks. Four second connecting rods are uniformly rotatably connected to the side wall of the second guiding sleeve. The ends of the four second connecting rods are respectively rotatably connected to the four first guiding blocks. A first moving assembly and a second moving assembly are arranged on the mounting frame. The first moving assembly is used to drive the first guiding sleeve to move on the guiding rod, and the second moving assembly is used to drive the second guiding sleeve to move on the guiding rod.

[0008] Further technical solution: The first moving assembly includes a first hollow rotary hydraulic cylinder fixed to the upper end of the mounting frame. The telescopic end of the first hollow rotary hydraulic cylinder is connected with a first connecting frame, and the end of the first connecting frame is fixed to the first guiding sleeve.

[0009] Further technical solution: The second moving assembly includes a second hollow rotary hydraulic cylinder fixed to the upper end of the mounting frame. The telescopic end of the second hollow rotary hydraulic cylinder is connected with a second connecting frame, and the end of the second connecting frame is fixed to the second guiding sleeve. The first connecting frame is hollow, and the second connecting frame penetrates through the first connecting frame.

[0010] Further technical solution: The guiding rod includes a fixed guiding rod and a movable guiding rod. One end of the fixed guiding rod is fixed at the axis of the end of the second rotating disk away from the first rotating disk. The movable guiding rod is rotatably connected to the other end of the fixed guiding rod. The movable guiding rod and the fixed guiding rod are fixedly connected by a fastening bolt. The first guiding sleeve is slidably connected to the fixed guiding rod, and the second guiding sleeve is slidably connected to the movable guiding rod.

[0011] Further technical solution: A motor is fixed on the mounting frame. A first gear is fixed to the rotating end of the motor. A second gear is fixed to one side wall of the rotating disk. The second gear meshes with the first gear.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. When clamping a thin-walled pipe fitting, the four first clamping shafts and the four second clamping shafts form four clamping jaws. The four second clamping shafts support the side wall of the thin-walled pipe fitting, and the four first clamping shafts cooperate with the four second clamping shafts to clamp the side wall of the thin-walled pipe fitting, thereby avoiding the problem of deformation of the side wall of the thin-walled pipe fitting due to force during clamping and improving the clamping stability of the thin-walled pipe fitting. 2. When clamping a rectangular workpiece, the four second guiding blocks drive the second clamping shafts to move synchronously towards each other. The four second clamping shafts contact the opposite two sides of the rectangular workpiece and clamp the rectangular workpiece. 3. When clamping a thin-walled flange, the four first clamping shafts contact the side wall of the long diameter of the thin-walled flange, and the four second clamping shafts contact the side wall of the short diameter of the thin-walled flange, thereby clamping the two side walls of the thin-walled flange simultaneously, increasing the clamping area of the side wall of the thin-walled flange, and improving the clamping stability of the thin-walled flange. The distance between the four first clamping shafts and the four second clamping shafts in the present invention is adjustable, thereby facilitating the clamping of thin-walled flanges with different proportional dimensions. 4. When machining the side wall and inner wall of a thin-walled pipe fitting or a pipe fitting with a normal wall thickness, the four second clamping shafts and the four first clamping shafts support the side wall or inner wall of the pipe fitting, increasing the support positions of the inner wall and the inner wall of the pipe fitting, thereby making the force on the pipe fitting more uniform, reducing the degree of deformation of the thin-walled pipe fitting, and protecting the pipe fitting. 5. When it is necessary to adjust the machining angle of the workpiece or when the workpiece needs to be machined in a rotating state, the motor drives the first gear to rotate. The first gear drives the first rotating disk to rotate through the second gear. The first rotating disk drives the second rotating disk to rotate. The first rotating disk and the second rotating disk drive the workpiece to rotate, thereby facilitating the machining of the workpiece and avoiding the disassembly and reinstallation of the workpiece when the machining angle of the workpiece needs to be adjusted. Description of the Drawings

[0013] Figure 1 It is a schematic structural diagram of a hydraulic clamping device for a numerical control machine tool provided by the present invention; Figure 2Provided by the present invention Figure 1 Schematic structural diagram of the right tilt angle Figure 3 Provided by the present invention Figure 1 Schematic structural diagram after removing the mounting bracket, the first hollow rotary hydraulic cylinder and the second hollow rotary hydraulic cylinder Figure 4 Provided by the present invention Figure 1 Schematic connection structure diagram of the first rotating disk Figure 5 Provided by the present invention Figure 2 Schematic connection structure diagram of the second rotating disk Figure 6 Schematic structural diagram of a hydraulic clamping device for a numerically controlled machine tool to clamp the inner wall and side wall of a thin-walled pipe fitting Figure 7 Schematic structural diagram of a hydraulic clamping device for a numerically controlled machine tool to clamp a rectangular part Figure 8 Schematic structural diagram of a hydraulic clamping device for a numerically controlled machine tool to clamp two side walls of a thin-walled flange part Figure 9 Schematic structural diagram of a hydraulic clamping device for a numerically controlled machine tool to clamp the side wall of a thin-walled pipe fitting Figure 10 Schematic structural diagram of a hydraulic clamping device for a numerically controlled machine tool to clamp the inner wall of a thin-walled pipe fitting

[0014] In the drawings: 101, mounting bracket; 102, first rotating disk; 103, second rotating disk; 104, first guide groove; 105, first guide block; 106, first clamping shaft; 107, second guide groove; 108, second guide block; 109, second clamping shaft; 110, extension sleeve; 111, thin-walled pipe fitting; 112, rectangular part; 113, thin-walled flange part 2, drive mechanism; 201, guide rod; 202, first guide sleeve; 203, first connecting rod; 204, second guide sleeve; 205, second connecting rod 3, first moving assembly; 301, first connecting frame; 302, first hollow rotary hydraulic cylinder; 4, second moving assembly; 401, second connecting frame; 402, second hollow rotary hydraulic cylinder; 501, fixed guide rod; 502, movable guide rod; 503, fastening bolt; 504, first avoidance groove; 505, second avoidance groove; 601, first gear; 602, motor; 603, second gear Detailed implementation manners

[0015] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0016] The following describes in detail the specific implementation of the present invention with reference to specific embodiments.

[0017] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 shown, a hydraulic clamping device for a numerically controlled machine tool provided by an embodiment of the present invention includes a mounting frame 101, and further includes: a first rotating disk 102 rotatably connected to the mounting frame 101, one end of the first rotating disk 102 is provided with a second rotating disk 103, four first guiding grooves 104 are evenly arranged on the first rotating disk 102, the four first guiding grooves 104 are arranged in a radial pattern, and a first guiding block 105 is slidably connected to each of the four first guiding grooves 104 along the length direction. A first clamping shaft 106 is fixed to one end of each of the four first guiding blocks 105 away from the second rotating disk 103; four second guiding grooves 107 are evenly arranged on the second rotating disk 103, the four second guiding grooves 107 are arranged in a radial pattern, and a second guiding block 108 is slidably connected to each of the four second guiding grooves 107 along the length direction. A second clamping shaft 109 is fixed to one end of each of the four second guiding blocks 108 close to the first rotating disk 102; a driving mechanism 2 is arranged on the mounting frame 101, the driving mechanism 2 is used to drive the four first guiding blocks 105 to move synchronously towards or away from each other, and the driving mechanism 2 is used to drive the four second guiding blocks 108 to move synchronously towards or away from each other; an extension sleeve 110 is slidably connected to the ends of both the first clamping shaft 106 and the second clamping shaft 109, and the extension sleeve 110 is fixed to the first clamping shaft 106 or the second clamping shaft 109 by bolts.

[0018] In an embodiment of the present invention, when clamping the thin-walled pipe fitting 111, the four second clamping shafts 109 are sleeved inside the thin-walled pipe fitting 111. The driving mechanism 2 drives the four second guide blocks 108 to move synchronously in the reverse direction. The four second guide blocks 108 drive the second clamping shafts 109 to move synchronously in the reverse direction. The four second clamping shafts 109 contact the inner wall of the thin-walled pipe fitting 111. The driving mechanism 2 drives the four first guide blocks 105 to move synchronously in the opposite direction. The four first guide blocks 105 drive the four first clamping shafts 106 to move synchronously in the opposite direction. The four first clamping shafts 106 contact the side wall of the thin-walled pipe fitting 111. The four first clamping shafts 106 and the four second clamping shafts 109 form four clamping jaws. The four second clamping shafts 109 provide a supporting effect on the side wall of the thin-walled pipe fitting 111. The four first clamping shafts 106 cooperate with the four second clamping shafts 109 to clamp the side wall of the thin-walled pipe fitting 111 (as Figure 5 shown), thereby avoiding the problem of deformation of the side wall of the thin-walled pipe fitting 111 due to force during clamping, and improving the clamping stability of the thin-walled pipe fitting 111; When clamping a rectangular workpiece, the four first guide blocks 105 are located at the edge of the first rotating disk 102 and are not used. The rectangular part 112 is placed between the four second clamping shafts 109. The driving mechanism 2 drives the four second guide blocks 108 to move synchronously in the opposite direction. The four second guide blocks 108 drive the second clamping shafts 109 to move synchronously in the opposite direction. The four second clamping shafts 109 contact the two opposite sides of the rectangular part 112 and clamp the rectangular part 112 (as Figure 7 shown); When clamping the thin-walled flange 113, loosen the bolts on the extension sleeve 110, and then adjust the positions of the extension sleeves 110 on the second clamping shafts 109 and the first clamping shafts 106 so that the clamping length of the first clamping shafts 106 is greater than the clamping length of the second clamping shafts 109. The driving mechanism 2 drives the four first guide blocks 105 to move synchronously in the opposite direction. The four first guide blocks 105 drive the four first clamping shafts 106 to move synchronously in the opposite direction. The four first clamping shafts 106 contact the side wall of the long diameter of the thin-walled flange 113. The driving mechanism 2 drives the four second guide blocks 108 to move synchronously in the opposite direction. The four second guide blocks 108 drive the second clamping shafts 109 to move synchronously in the opposite direction. The four second clamping shafts 109 contact the side wall of the short diameter of the thin-walled flange 113, thereby clamping the two side walls of the thin-walled flange 113 simultaneously, increasing the clamping area of the side wall of the thin-walled flange 113, and improving the clamping stability of the thin-walled flange 113. In the present invention, the distance between the four first clamping shafts 106 and the four second clamping shafts 109 is adjustable, which is convenient for clamping thin-walled flanges 113 with different proportional dimensions.

[0019] As Figures 1 - 5As shown, as a preferred embodiment of the present invention, the driving mechanism 2 includes a guide rod 201 fixed at the axis of one end of the rotating disk two 103 away from the rotating disk one 102. A first guide sleeve 202 and a second guide sleeve 204 are slidably connected to the guide rod 201 along the length direction. Four first connecting rods 203 are evenly and rotatably connected to the side wall of the first guide sleeve 202, and the ends of the four first connecting rods 203 are respectively rotatably connected to four second guide blocks 108. Four second connecting rods 205 are evenly and rotatably connected to the side wall of the second guide sleeve 204, and the ends of the four second connecting rods 205 are respectively rotatably connected to four first guide blocks 105. A first moving assembly 3 and a second moving assembly 4 are arranged on the mounting frame 101. The first moving assembly 3 is used to drive the first guide sleeve 202 to move on the guide rod 201, and the second moving assembly 4 is used to drive the second guide sleeve 204 to move on the guide rod 201. The first moving assembly 3 includes a first hollow rotary hydraulic cylinder 302 fixed to the upper end of the mounting frame 101. The telescopic end of the first hollow rotary hydraulic cylinder 302 is connected to a first connecting frame 301, and the end of the first connecting frame 301 is fixed to the first guide sleeve 202. The second moving assembly 4 includes a second hollow rotary hydraulic cylinder 402 fixed to the upper end of the mounting frame 101. The telescopic end of the second hollow rotary hydraulic cylinder 402 is connected to a second connecting frame 401, and the end of the second connecting frame 401 is fixed to the second guide sleeve 204. The first connecting frame 301 is hollow, and the second connecting frame 401 passes through the first connecting frame 301.

[0020] In the embodiment of the present invention, when the four first clamping shafts 106 move synchronously towards each other, the second hollow rotary hydraulic cylinder 402 drives the second connecting frame 401 to move, the second connecting frame 401 drives the second guide sleeve 204 to move. Under the guiding action of the four first guide grooves 104, the second guide sleeve 204 drives the four first guide blocks 105 to move synchronously towards each other through the four second connecting rods 205, and the four first guide blocks 105 drive the four first clamping shafts 106 to move synchronously towards each other. When the four first clamping shafts 106 move synchronously in the opposite direction, the second hollow rotary hydraulic cylinder 402 drives the second connecting frame 401 to move in the opposite direction, the second connecting frame 401 drives the second guide sleeve 204 to move in the opposite direction. Under the guiding action of the four first guide grooves 104, the second guide sleeve 204 drives the four first guide blocks 105 to move synchronously in the opposite direction through the four second connecting rods 205, and the four first guide blocks 105 drive the four first clamping shafts 106 to move synchronously in the opposite direction. When the four second clamping shafts 109 move synchronously towards each other, the first hollow rotary hydraulic cylinder 302 drives the first connecting frame 301 to move, the first connecting frame 301 drives the first guide sleeve 202 to move. Under the guiding action of the four second guide grooves 107, the first guide sleeve 202 drives the four second guide blocks 108 to move synchronously towards each other through the four first connecting rods 203, and the four second guide blocks 108 drive the four second clamping shafts 109 to move synchronously towards each other. When the four clamping shafts II 109 move synchronously in the reverse direction, the hollow rotary hydraulic cylinder I 302 drives the connecting frame I 301 to move in the reverse direction. The connecting frame I 301 drives the guide sleeve I 202 to move in the reverse direction. Under the guiding action of the four guiding grooves II 107, the guide sleeve I 202 drives the four guiding blocks II 108 to move synchronously in the reverse direction through the four connecting rods I 203, and the four guiding blocks II 108 drive the four clamping shafts II 109 to move synchronously in the reverse direction.

[0021] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 9 and Figure 10 shown, as a preferred embodiment of the present invention, the guide rod 201 includes a fixed guide rod 501 and a movable guide rod 502. One end of the fixed guide rod 501 is fixed at the axis center of the end of the rotating disk II 103 far from the rotating disk I 102. The movable guide rod 502 is rotatably connected to the other end of the fixed guide rod 501. The movable guide rod 502 and the fixed guide rod 501 are fixedly connected by a fastening bolt 503. The guide sleeve I 202 is slidably connected to the fixed guide rod 501, and the guide sleeve II 204 is slidably connected to the movable guide rod 502. Four avoidance grooves I 504 for avoiding the movement of the four clamping shafts I 106 are provided on the rotating disk I 102, and four avoidance grooves II 505 for avoiding the movement of the four guiding blocks I 105 are provided on the rotating disk II 103. The rotating disk II 103 is rotatably connected to one end of the rotating disk I 102, and the rotating disk II 103 and the rotating disk I 102 are fixedly connected by a fastening bolt 503.

[0022] In the embodiment of the present invention, when it is necessary to process the side wall and inner wall of the thin-walled pipe fitting 111 or the pipe fitting with normal wall thickness, the clamping shafts I 106 and the clamping shafts II 109 will side-block the side wall and inner wall of the thin-walled pipe fitting 111 or the pipe fitting with normal wall thickness, which is not convenient for processing the side wall and inner wall of the pipe fitting; Loosen the fastening bolt 503, rotate the rotating disk II 103 to make the rotating disk II 103 rotate relative to the rotating disk I 102. The rotating disk II 103 drives the guiding blocks II 108, the clamping shafts II 109, the fixed guide rod 501, the guide sleeve I 202, the connecting rod I 203 and the connecting frame I 301 to rotate, thereby adjusting the positions of the four guiding blocks II 108 and the four clamping shafts II 109 to make the four clamping shafts II 109 and the four clamping shafts I 106 evenly distributed in a ring, and then tighten the fastening bolt 503; When the four clamping shafts II 109 and the four clamping shafts I 106 move synchronously in the reverse direction, the four clamping shafts II 109 and the four clamping shafts I 106 support the inner wall of the pipe fitting (as Figure 10), when the four second clamping shafts 109 and the four first clamping shafts 106 move synchronously towards each other, the four second clamping shafts 109 and the four first clamping shafts 106 support the side wall of the pipe fitting (such as Figure 10 ), increasing the support positions on the inner walls of the pipe fitting, thereby making the force on the pipe fitting more uniform, reducing the degree of deformation of the thin-walled pipe fitting 111, and protecting the pipe fitting.

[0023] Such as Figure 1 and Figure 4 As shown, as a preferred embodiment of the present invention, a motor 602 is fixed on the mounting frame 101, a first gear 601 is fixed to the rotating end of the motor 602, a second gear 603 is fixed to the side wall of the first rotating disk 102, and the second gear 603 meshes with the first gear 601.

[0024] In the embodiment of the present invention, when it is necessary to adjust the machining angle of the workpiece or when the workpiece needs to be machined in a rotating state, the motor 602 drives the first gear 601 to rotate, the first gear 601 drives the second gear 603 to rotate, the second gear 603 drives the first rotating disk 102 to rotate, the first rotating disk 102 drives the second rotating disk 103 to rotate, and the first rotating disk 102 and the second rotating disk 103 drive the workpiece to rotate, thereby facilitating the machining of the workpiece and avoiding the disassembly and reinstallation of the workpiece when the machining angle of the workpiece needs to be adjusted.

[0025] In the above embodiment of the present invention, a hydraulic clamping device for a numerical control machine tool is provided. When clamping the thin-walled pipe fitting 111, the four second clamping shafts 109 are sleeved inside the thin-walled pipe fitting 111, the driving mechanism 2 drives the four second guide blocks 108 to move synchronously in the opposite direction, the four second guide blocks 108 drive the second clamping shafts 109 to move synchronously in the opposite direction, the four second clamping shafts 109 contact the inner wall of the thin-walled pipe fitting 111, the driving mechanism 2 drives the four first guide blocks 105 to move synchronously towards each other, the four first guide blocks 105 drive the four first clamping shafts 106 to move synchronously towards each other, the four first clamping shafts 106 contact the side wall of the thin-walled pipe fitting 111, the four first clamping shafts 106 and the four second clamping shafts 109 form four clamping jaws, the four second clamping shafts 109 support the side wall of the thin-walled pipe fitting 111, and the four first clamping shafts 106 cooperate with the four second clamping shafts 109 to clamp the side wall of the thin-walled pipe fitting 111 (such as Figure 5 shown), thereby avoiding the problem of deformation of the side wall of the thin-walled pipe fitting 111 due to force during clamping and improving the clamping stability of the thin-walled pipe fitting 111; Adjust the positions of the four second guide blocks 108 and the four second clamping shafts 109 so that the four second clamping shafts 109 and the four first clamping shafts 106 are evenly distributed in a ring. When the four second clamping shafts 109 and the four first clamping shafts 106 move synchronously in the opposite direction, the four second clamping shafts 109 and the four first clamping shafts 106 support the inner wall of the pipe fitting (such as Figure 10), when the four second clamping shafts 109 and the four first clamping shafts 106 move synchronously towards each other, the four second clamping shafts 109 and the four first clamping shafts 106 support the side wall of the pipe fitting (such as Figure 10 ), the support positions of the inner wall and the inner wall of the pipe fitting are increased, so that the force on the pipe fitting is more uniform, thereby reducing the degree of deformation of the thin-walled pipe fitting 111 and protecting the pipe fitting; When clamping a rectangular workpiece, the four first guide blocks 105 are located at the edge of the first rotating disk 102 and are not used. The rectangular part 112 is placed between the four second clamping shafts 109. The driving mechanism 2 drives the four second guide blocks 108 to move synchronously towards each other. The four second guide blocks 108 drive the four second clamping shafts 109 to move synchronously towards each other. The two sides of the four second clamping shafts 109 opposite to the rectangular part 112 come into contact and clamp the rectangular part 112 (such as Figure 7 shown); When clamping the thin-walled flange part 113, loosen the bolts on the extension sleeve 110, and then adjust the position of the extension sleeve 110 on the second clamping shaft 109 and the first clamping shaft 106, so that the clamping length of the first clamping shaft 106 is greater than the clamping length of the second clamping shaft 109. The driving mechanism 2 drives the four first guide blocks 105 to move synchronously towards each other. The four first guide blocks 105 drive the four first clamping shafts 106 to move synchronously towards each other. The four first clamping shafts 106 come into contact with the side wall of the long diameter of the thin-walled flange part 113. The driving mechanism 2 drives the four second guide blocks 108 to move synchronously towards each other. The four second guide blocks 108 drive the four second clamping shafts 109 to move synchronously towards each other. The four second clamping shafts 109 come into contact with the side wall of the short diameter of the thin-walled flange part 113, and then clamp the two side walls of the thin-walled flange part 113 at the same time, thereby increasing the clamping area of the side wall of the thin-walled flange part 113 and improving the clamping stability of the thin-walled flange part 113. In the present invention, the distance between the four first clamping shafts 106 and the four second clamping shafts 109 is adjustable, so as to facilitate clamping of thin-walled flange parts 113 with different proportional dimensions; When it is necessary to adjust the processing angle of the workpiece or when the workpiece needs to be processed in a rotating state, the motor 602 drives the first gear 601 to rotate. The first gear 601 drives the second gear 603 to rotate. The second gear 603 drives the first rotating disk 102 to rotate. The first rotating disk 102 drives the second rotating disk 103 to rotate. The first rotating disk 102 and the second rotating disk 103 drive the workpiece to rotate, so as to facilitate processing of the workpiece and avoid disassembling and reinstalling the workpiece when the processing angle of the workpiece needs to be adjusted.

[0026] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A hydraulic clamping device for a CNC machine tool, comprising a mounting frame, characterized in that: Also includes: A rotating disk 1 is rotatably connected to the mounting frame, a rotating disk 2 is arranged at one end of the rotating disk 1, four guide grooves 1 are evenly arranged on the rotating disk 1, the four guide grooves 1 are radially arranged, and guide blocks 1 are slidably connected along the length direction of the four guide grooves 1, and a clamping shaft 1 is fixed to one end of the four guide blocks 1 away from the rotating disk 2; Four guide grooves 2 are evenly arranged on the rotating disk 2, and the four guide grooves 2 are arranged radially. The four guide grooves 2 are slidably connected with guide blocks 2 along the length direction, and the four guide blocks 2 are fixed with clamping shafts 2 at one end close to the rotating disk 1; The mounting frame is provided with a driving mechanism, the driving mechanism is used to drive the four guide blocks to move synchronously in one direction or in the opposite direction, and the driving mechanism is used to drive the four guide blocks to move synchronously in two directions or in the opposite direction; The ends of the clamping shaft one and the clamping shaft two are both slidably connected with an extended clamping sleeve, and the extended clamping sleeve is fixed on the clamping shaft one or the clamping shaft two by bolts.

2. The hydraulic clamping device for CNC machine tools according to claim 1, characterized in that: The rotating disk 1 is provided with four avoidance grooves 1 for avoiding the movement of the four clamping shafts 1, and the rotating disk 2 is provided with four avoidance grooves 2 for avoiding the movement of the four guide blocks 1. The rotating disk 2 is rotatably connected to one end of the rotating disk 1, and the rotating disk 2 is fixedly connected to the rotating disk 1 by fastening bolts.

3. The hydraulic clamping device for CNC machine tools according to claim 2, characterized in that: The driving mechanism includes a guide rod fixed at the axis of one end of the rotating disk 2 away from the rotating disk 1, a guide sleeve 1 and a guide sleeve 2 are slidably connected to the guide rod along the length direction, four connecting rods 1 are evenly rotatably connected to one side wall of the guide sleeve, the ends of the four connecting rods 1 are respectively rotatably connected to four guide blocks 2, four connecting rods 2 are evenly rotatably connected to the side wall of the guide sleeve 2, the ends of the four connecting rods 2 are respectively rotatably connected to the four guide blocks 1, and a moving component 1 and a moving component 2 are arranged on the mounting frame, the moving component 1 is used to drive the guide sleeve 1 to move on the guide rod, and the moving component 2 is used to drive the guide sleeve 2 to move on the guide rod.

4. The hydraulic clamping device for CNC machine tools according to claim 3, characterized in that: The moving component 1 comprises a hollow rotary hydraulic cylinder 1 fixed on the upper end of a mounting frame, the telescopic end of the hollow rotary hydraulic cylinder 1 is connected with a connecting frame 1, and the end of the connecting frame 1 is fixed on a guide sleeve 1.

5. The hydraulic clamping device for CNC machine tools according to claim 4, characterized in that: The mobile component 2 includes a hollow rotary hydraulic cylinder 2 fixed on the upper end of the mounting frame, the telescopic end of the hollow rotary hydraulic cylinder 2 is connected to a connecting frame 2, the end of the connecting frame 2 is fixed on a guide sleeve 2, the connecting frame 1 is hollow, and the connecting frame 2 passes through the connecting frame 1.

6. The hydraulic clamping device for CNC machine tools according to claim 3, characterized in that: The guide rod includes a fixed guide rod and a movable guide rod. One end of the fixed guide rod is fixed to the axis of the end of the rotating disk 2 away from the rotating disk 1. The movable guide rod is rotatably connected to the other end of the fixed guide rod. The movable guide rod is fixedly connected to the fixed guide rod by fastening bolts. The guide sleeve 1 is slidably connected to the fixed guide rod, and the guide sleeve 2 is slidably connected to the movable guide rod.

7. The hydraulic clamping device for CNC machine tools according to claim 1, characterized in that: A motor is fixed on the mounting frame, a gear one is fixed on the rotating end of the motor, a gear two is fixed on a side wall of the rotating disk, and the gear two is meshed with the gear one.

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