A clamping tool for polishing flange forgings

Abstract

The present invention belongs to the field of flange processing technology, and discloses a clamping tool for polishing flange forgings, including a bracket and a fixed block, a hydraulic cylinder is installed on the top of the fixed block, a support plate is fixedly installed on the telescopic end of the hydraulic cylinder, a placement groove is provided on the top of the support plate, an electromagnet is fixedly installed inside the placement groove, and the outer peripheral surface of the fixed block is provided with three groups of convex angles set at equal angles, a transmission cavity is provided at one end of the convex angle, a piston column 2 and a spring 1 are provided in the internal sealing sleeve of the transmission cavity, and a sealing cylinder is fixedly connected to the top of the convex angle. This device makes the pressure and friction force of the workpiece clamped larger and larger, and then gradually overcomes the magnetic attraction of the electromagnet through the friction force generated between the workpiece and the inner wall of the clamping block. When the electromagnet is out of contact with the bottom of the workpiece, it means that the friction force on the workpiece is the largest, that is, the hydraulic cylinder is stopped, and the clamping force of the workpiece is precisely controlled, thereby effectively protecting the workpiece.

Description

Technical Field

[0001] The invention belongs to the technical field of flange processing, and in particular relates to a clamping tool for polishing and processing flange forgings. Background Art

[0002] Flanges are common fittings that connect metal pipes and keep them tight. They are designed in the shape of a metal ring. They are sleeved on the connecting end of the pipe and fixed by welding. Then two sets of flanges are connected by bolts to keep the two adjacent pipes in a stable connection state. In order to maintain the assembly quality, the manufacturing standards of flanges are very strict. The blanks are forged and formed into ring-shaped flange forgings. In order to remove burrs and impurities such as flanges on the surface of the flange forgings after forging, the butt joint surface of the flange forgings needs to be polished. The butt joint surface of the flange forgings is made smooth by grinding and polishing, which is convenient for positioning and subsequent processing. When the flange forgings are polished It is necessary to use a clamping tool to clamp it. Since the structure of the clamping tool in the prior art is relatively simple, it may cause excessive pressure to damage the flange forging and uneven the mating surface, resulting in low polishing accuracy. The clamping tool is used to clamp the multiple groups of clamping block assemblies of the flange forging. When applying pressure to the flange forging, the pressure control used for clamping is not precise enough. The pressure and friction generated by the abutment can easily damage the outer surface of the flange forging while maintaining stability. The clamping parts generally do not have a horizontal positioning function. Their single function may cause the mating surface of the flange forging to shift during the clamping and pressing process, causing shifting action during polishing, resulting in the flange forging being scrapped. Summary of the invention

[0003] The object of the present invention is to provide a clamping tool for polishing flange forgings to solve the problems raised in the above-mentioned background technology.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a flange forging polishing clamping tool, comprising a bracket and a fixed block, a hydraulic cylinder is installed on the top of the fixed block, a support plate is fixedly installed on the telescopic end of the hydraulic cylinder, a placement groove is provided on the top of the support plate, an electromagnet is fixedly installed inside the placement groove, the outer peripheral surface of the fixed block is provided with three groups of convex angles set at equal angles, a transmission cavity is provided at one end of the convex angle, a sealing sleeve inside the transmission cavity is provided with a piston column 2 and a spring 1, a sealing cylinder is fixedly connected to the top of the convex angle, a piston column 1 is provided inside the sealing sleeve of the sealing cylinder, the top of the piston column 1 is fixedly connected to the hydraulic cylinder, a connecting pipe is fixedly connected to the bottom of the convex angle, an oil storage cylinder is fixedly installed on the bottom of the fixed block, and an electromagnet is installed on the bottom of the oil storage cylinder The cam is an oil pump which is put into the oil pumping station and is convenient to use and can be used for oil pumping station and oil pumping station.

[0005] As a preferred solution of the present invention, the sealing sleeve is made of a rubber block and is in sealing contact with the inner wall of the oil storage cylinder. The interior of the airbag is filled with gas and is compressed by the hydraulic oil in the inner cavity of the oil storage cylinder.

[0006] As a preferred solution of the present invention, the connecting pipes are arranged in three groups and are fixedly connected to the outer surface of the oil storage cylinder at equal angles, the oil drain holes are arranged in three groups and are opened at equal angles on the outer surfaces of the rotating cylinder and the sealing sleeve, and the three groups of oil drain holes are staggered with the three groups of connecting holes.

[0007] As a preferred solution of the present invention, the axial cross-section shape of the piston column 2 is "T"-shaped, the piston column 2 is horizontally inserted into the inner wall of the transmission chamber, the connecting port of the sealing cylinder, the connecting tube and the inner cavity of the transmission chamber is connected to one end of the clamping block near the piston column 2, and the two ends of the spring 1 are elastically connected to the transmission chamber and the other end of the piston column 2 respectively.

[0008] As a preferred solution of the present invention, the hydraulic oil is sealed against the bottom end of piston column one upwards and is sealed against the outer surface of the sealing sleeve downwards. The hydraulic oil is sealed around the outer surface of piston column two. Another group of hydraulic oil fills the inner cavity of the oil reservoir and is sealed against the outer surface of the airbag.

[0009] As a preferred solution of the present invention, the upper surface of the support plate is kept flush with the bottom of the inner wall of the slot, and the vertical diameter of the roller is located on one side of the inner cavity of the slot.

[0010] As a preferred solution of the present invention, a gap X is left between one end of the buffer frame located in the inner cavity of the slot and the inner wall of the slot, and the maximum horizontal distance between the side of the clamping block close to the second piston column and the outer surface of the roller is X.

[0011] As a preferred solution of the present invention, the roller and the sealing sleeve are made of hard rubber, and the height values ​​of the sealing sleeve and the airbag are both smaller than the depth value of the inner cavity of the oil storage cylinder.

[0012] The beneficial effects of the present invention are as follows:

[0013] The device has been redesigned to achieve a rolling flexible buffering function for the workpiece, so as to avoid damage to the workpiece due to excessive clamping force when the workpiece is clamped. The second piston column in the transmission chamber and the transmission chamber are provided, and the clamping block is maintained to move horizontally toward one side of the hydraulic cylinder axis under the cooperation of hydraulic oil, sealing tube and piston column one. When the workpiece falls on the upper surface of the support plate, the roller rolls against the outer surface of the workpiece to provide rolling buffering to prevent the outer surface of the workpiece from being scratched. At the same time, the roller drives the buffer frame to move toward the inside of the slot under the action of the workpiece, and compresses the second spring to generate a horizontal elastic force acting on the workpiece. In the early stage of clamping, buffer protection is provided, the workpiece is adsorbed and fixed by the electromagnet, and the workpiece and piston column 1 are driven to move downward synchronously by the hydraulic cylinder. The sealing tube is used to pressurize the hydraulic oil in the transmission chamber, driving the piston column 2 and the clamping block to move toward the axis of the hydraulic cylinder, and pressurizing the outer peripheral surface of the workpiece, so that the pressure and friction of the workpiece clamped are increasing, and then the friction force generated between the workpiece and the inner wall of the clamping block gradually overcomes the magnetic attraction of the electromagnet. When the electromagnet is out of contact with the bottom of the workpiece, it means that the friction force on the workpiece is the largest, that is, the hydraulic cylinder is stopped, and the clamping force of the workpiece is accurately controlled, thereby effectively protecting the workpiece.

[0014] The device also adds a connecting pipe and an oil storage cylinder, so that the clamping block and the piston column two can be freely extended and retracted, and can adapt to workpieces of different sizes. The motor drives the rotating cylinder and the sealing sleeve to rotate to a position where the connecting hole and the oil drain hole are staggered, and the connecting pipe and the oil storage cylinder are blocked, so that the hydraulic oil in the inner cavity of the transmission chamber can only act on the piston column two and the clamping block under the push of the piston column one, so as to maintain normal clamping work. When the oil drain hole rotates to a position overlapping with the connecting hole, the transmission chamber, the connecting pipe and the oil storage cylinder are connected, and the clamping block and the piston column two can be freely extended and retracted, so that the hydraulic oil in the transmission chamber and the connecting pipe can automatically enter or leave the oil storage cylinder according to the extension and retraction needs of the piston column two, and the air bag is used to ensure that the hydraulic oil always fills the inner cavity of the transmission chamber, the connecting pipe and the oil storage cylinder. With this design, the clamping block can adapt to workpieces of different sizes by freely extending and retracting, and has the advantage of strong applicability.

[0015] The device first makes the workpiece abut against the roller and falls on the upper surface of the support plate. The rolling abutment between the roller and the workpiece prevents the workpiece from being fixed by the clamping force and causing deviation when being clamped by the clamping block. The device is provided with an electromagnet to firmly adsorb the workpiece to the upper surface of the support plate, and cooperates with the roller that rolls and abuts with it, so that the bottom of the workpiece and the support plate can adapt and abut, while maintaining horizontal positioning. After the roller is abutted by the workpiece, it gives way and pushes the buffer frame to compress the second spring, generating a horizontal thrust, so that the workpiece is automatically leveled before being rigidly clamped by the clamping block, thereby improving the final polishing accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the interior three-dimensional section of the fixing block, the oil storage cylinder and the connecting pipe of the present invention;

[0017] Figure 2 It is a side perspective schematic diagram of the structure of the present invention;

[0018] Figure 3 It is a schematic diagram of the appearance when viewed from above of the structure of the present invention;

[0019] Figure 4 It is a front cutaway schematic diagram of the overall structure of the present invention;

[0020] Figure 5 For the present invention Figure 4 A magnified schematic diagram of the structure at center A;

[0021] Figure 6 It is a schematic diagram of the separation of the bracket, the fixing block, the hydraulic cylinder, the supporting plate, the electromagnet, the oil storage cylinder, the motor, the connecting pipe, the sealing cylinder, the first piston column, the clamping block, the buffer frame, the roller, the second spring and the limit block of the present invention;

[0022] Figure 7 It is a schematic diagram of the separation of the oil storage cylinder, the motor, the connecting pipe, the rotating cylinder, the air bag and the sealing sleeve of the present invention;

[0023] Figure 8 It is a three-dimensional cutaway schematic diagram of the oil storage cylinder and the connecting pipe of the present invention;

[0024] Fig. 9 It is a schematic diagram of the internal structure of the card slot of the present invention.

[0025] In the figure: 1. bracket; 2. fixing block; 3. hydraulic cylinder; 4. supporting plate; 5. placement groove; 6. electromagnet; 7. oil storage cylinder; 8. motor; 9. connecting pipe; 10. sealing cylinder; 11. piston column one; 12. transmission chamber; 13. piston column two; 14. spring one; 15. clamping block; 16. slot; 17. buffer frame; 18. roller; 19. spring two; 20. limit block; 21. connecting hole; 22. rotating drum; 23. airbag; 24. sealing sleeve; 25. oil drain hole; 26. convex corner. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] like Figures 1 to 9As shown, the embodiment of the present invention provides a clamping tool for polishing flange forgings, including a bracket 1 and a fixed block 2. A hydraulic cylinder 3 is installed on the top of the fixed block 2. A support plate 4 is fixedly installed on the telescopic end of the hydraulic cylinder 3. A placement groove 5 is provided on the top of the support plate 4. An electromagnet 6 is fixedly installed inside the placement groove 5. The outer peripheral surface of the fixed block 2 is provided with three groups of convex corners 26 arranged at equal angles. A transmission cavity 12 is provided at one end of the convex corner 26. A piston column 13 and a spring 14 are provided in the internal sealing sleeve of the transmission cavity 12. A sealing cylinder 10 is fixedly connected to the top of the convex corner 26. A piston column 11 is provided in the internal sealing sleeve of the sealing cylinder 10. The top of the piston column 11 is fixedly connected to the hydraulic cylinder 3. A connecting pipe 9 is fixedly connected to the bottom of the convex corner 26. An oil storage cylinder 7 is fixedly installed on the bottom of the fixed block 2. A motor 8 is installed at the bottom of the oil storage cylinder 7. The output shaft of the motor 8 extends To the inner cavity of the oil storage cylinder 7, and fixedly connected with a rotating cylinder 22 located in the inner cavity of the oil storage cylinder 7, the outer surface of the rotating cylinder 22 is fixedly connected with a sealing sleeve 24, the outer surface of the oil storage cylinder 7 is provided with a plurality of connecting holes 21 connected with the connecting pipe 9, the outer surfaces of the rotating cylinder 22 and the sealing sleeve 24 are provided with a plurality of oil discharge holes 25, the top of the rotating cylinder 22 is fixedly connected with an air bag 23, the transmission cavity 12, the connecting pipe 9 and the inner cavity of the oil storage cylinder 7 are filled with hydraulic oil, one end of the piston column 13 is fixedly connected with a clamping block 15, a limit block 20 is fixedly installed on the top of the clamping block 15, a card slot 16 is opened on the top of the clamping block 15 facing the side of the piston column 13, a buffer frame 17 is slidably installed inside the card slot 16, a roller 18 is rotatably installed on the outer side of the buffer frame 17, a spring 19 is elastically connected inside the buffer frame 17, and is elastically supported in the card slot 16 by the spring 19;

[0028] This device has been redesigned to achieve a rolling flexible buffering function for the workpiece, so as to prevent the workpiece from being damaged due to excessive clamping force when being clamped. By providing the piston column 2 13 in the transmission chamber 12 and the transmission chamber 12, the clamping block 15 is maintained to move horizontally toward one side of the axis of the hydraulic cylinder 3 under the cooperation of the hydraulic oil, the sealing cylinder 10 and the piston column 11. When the workpiece falls on the upper surface of the support plate 4, the roller 18 rolls against the outer surface of the workpiece to provide rolling buffering to prevent the outer surface of the workpiece from being scratched. At the same time, the roller 18 drives the buffer frame 17 to move toward the inside of the card slot 16 under the action of the workpiece, and compresses the spring 2 19 to generate a horizontal elastic force acting on the workpiece. In the early stage of workpiece clamping, buffer protection is provided, the workpiece is adsorbed and fixed by the electromagnet 6, and the workpiece and the piston column 11 are driven to move downward synchronously by the hydraulic cylinder 3. The sealing tube 10 is used to pressurize the hydraulic oil in the transmission chamber 12, driving the piston column 2 13 and the clamping block 15 to move toward the axis of the hydraulic cylinder 3, and applying pressure to the outer peripheral surface of the workpiece, so that the pressure and friction of the workpiece clamped are increasing, and then the friction force generated between the workpiece and the inner wall of the clamping block 15 gradually overcomes the magnetic attraction of the electromagnet 6. When the electromagnet 6 is out of contact with the bottom of the workpiece, it means that the friction force on the workpiece is the largest, that is, the hydraulic cylinder 3 is stopped, and the precise control of the clamping force of the workpiece is completed, thereby effectively protecting the workpiece.

[0029] The sealing sleeve 24 is made of a rubber block and is in sealing contact with the inner wall of the oil storage cylinder 7. The interior of the airbag 23 is filled with gas and is compressed by the hydraulic oil in the inner cavity of the oil storage cylinder 7.

[0030] The sealing sleeve 24 is used to seal the multiple connecting holes 21 opened on the outer surface of the oil storage cylinder 7. When the motor 8 drives the rotating cylinder 22 and the sealing sleeve 24 to rotate to the position where the oil discharge hole 25 and the connecting hole 21 are staggered, the connecting pipe 9 and the oil storage cylinder 7 are sealed and blocked by the solid part of the sealing sleeve 24, and the hydraulic oil cannot flow. When the two overlap, the connecting pipe 9 and the oil storage cylinder 7 are connected. When the clamping block 15 moves horizontally, the hydraulic oil in the inner cavity of the transmission chamber 12 can freely enter the interior of the oil storage cylinder 7. The airbag 23 can be deformed under the action of external force, so that the hydraulic oil located in the inner cavity of the oil storage cylinder 7 always remains in a tightly filled state.

[0031] The device also installs a connecting pipe 9 and an oil storage cylinder 7, so that the clamping block 15 and the piston column 13 can be freely extended and retracted, and adapt to workpieces of different sizes. The motor 8 drives the rotating cylinder 22 and the sealing sleeve 24 to rotate to the position where the connecting hole 21 and the oil discharge hole 25 are staggered, and the connecting pipe 9 and the oil storage cylinder 7 are blocked, so that the hydraulic oil in the inner cavity of the transmission chamber 12 can only act on the piston column 13 and the clamping block 15 under the push of the piston column 11, and maintain normal clamping work. When the oil discharge hole 25 rotates to the position where the connecting hole 21 and the oil discharge hole 25 are staggered, the hydraulic oil in the inner cavity of the transmission chamber 12 can only act on the piston column 13 and the clamping block 15 under the push of the piston column 11, the normal clamping work is maintained. When they are in the overlapping position, the transmission chamber 12, the connecting tube 9 and the oil storage cylinder 7 are connected. Through the free telescopic clamping block 15 and the piston column 13, the hydraulic oil in the transmission chamber 12 and the connecting tube 9 can automatically choose to enter or leave the oil storage cylinder 7 according to the telescopic needs of the piston column 13. The hydraulic oil is always filled with the transmission chamber 12, the connecting tube 9 and the inner cavity of the oil storage cylinder 7 through the air bag 23. With this design, the clamping block 15 can adapt to workpieces of different sizes through free telescopic movement, which has the advantage of strong applicability.

[0032] The connecting pipes 9 are arranged in three groups and fixedly connected to the outer surface of the oil storage cylinder 7 at equal angles. The oil drain holes 25 are arranged in three groups and opened at equal angles on the outer surfaces of the rotating cylinder 22 and the sealing sleeve 24. The three groups of oil drain holes 25 and the three groups of connecting holes 21 are staggered.

[0033] The three groups of connecting holes 21 correspond to the three groups of oil drain holes 25 respectively. When the connecting holes 21 are staggered with the oil drain holes 25, the hydraulic oil in the oil storage cylinder 7 is isolated from the hydraulic oil in the connecting pipe 9 and the transmission chamber 12, and cannot flow. The clamping block 15 cannot extend outward and adapt to larger-sized workpieces, but vice versa.

[0034] The axial cross-section of the piston column 13 is in a "T" shape. The piston column 13 is horizontally plugged into the inner wall of the transmission chamber 12. The connecting openings of the sealing cylinder 10, the connecting pipe 9 and the inner cavity of the transmission chamber 12 are connected to one end of the clamping block 15 near the piston column 13. The two ends of the spring 14 are elastically connected to the transmission chamber 12 and the other end of the piston column 13 respectively.

[0035] like Figure 4 As shown, when the piston column 11 moves downward, the hydraulic oil is pressed to push the piston column 2 13. At this time, the sealing sleeve 24 located in the inner cavity of the oil storage cylinder 7 uses its flexible material to bear the displacement buffer when the clamping block 15 is rigidly in contact with the workpiece.

[0036] The hydraulic oil seals and abuts against the bottom end of the piston column 11 upwards, and seals and abuts against the outer surface of the sealing sleeve 24 downwards. The hydraulic oil seals and wraps around the outer surface of the piston column 2 13. Another group of hydraulic oil fills the inner cavity of the oil storage cylinder 7 and seals and abuts against the outer surface of the airbag 23.

[0037] When the hydraulic oil is located in the transmission chamber 12 and the connecting pipe 9, the interior thereof becomes a hydraulic system, and the diameter value of the piston column 11 is smaller than the diameter value of the piston column 2 13. When the piston column 11 moves downward, it will push the piston column 2 13 to move synchronously with a smaller displacement.

[0038] The upper surface of the support plate 4 is kept flush with the bottom of the inner wall of the card slot 16, and the vertical diameter of the roller 18 is located on one side of the inner cavity of the card slot 16;

[0039] The workpiece first abuts against the roller 18 and falls on the upper surface of the support plate 4. The rolling abutment between the roller 18 and the workpiece prevents the workpiece from being fixed by the clamping force and causing displacement when clamped by the clamping block 15. The device is provided with an electromagnet 6 to firmly adsorb the workpiece on the upper surface of the support plate 4, and cooperates with the roller 18 that rolls and abuts therewith, so that the bottom of the workpiece and the support plate 4 can be adapted to abut against each other while maintaining a horizontal positioning. After being abutted by the workpiece, the roller 18 gives way and pushes the buffer frame 17 to compress the spring 19 to generate a horizontal thrust, so that the workpiece is automatically leveled before being rigidly clamped by the clamping block 15, thereby improving the final polishing accuracy.

[0040] There is a gap X between one end of the buffer frame 17 located in the inner cavity of the card slot 16 and the inner wall of the card slot 16, and the maximum horizontal distance between the side of the clamping block 15 close to the piston column 13 and the outer surface of the roller 18 is X;

[0041] When the buffer frame 17 is pushed to the inner wall of the slot 16 and cannot move any further, the outer surface of the roller 18 remains flush with the inner side of the clamping block 15, thereby making room for the workpiece, so that the solid part of the clamping block 15 can generate effective clamping force on the workpiece.

[0042] The roller 18 and the sealing sleeve 24 are made of hard rubber, and the height of the sealing sleeve 24 and the airbag 23 are both less than the depth of the inner cavity of the oil storage cylinder 7;

[0043] Both the motor 8 and the sealing sleeve 24 need to be in flexible contact with other components. The roller 18 is used to provide rotation buffer for the workpiece, while the sealing sleeve 24 provides a sealing function.

[0044] Working principle:

[0045] When the device is installed:

[0046] First, the workpiece is placed on the upper surface of the support plate 4, and the edge of the workpiece abuts against the roller 18 during the descending process, and the roller 18 and the buffer frame 17 are pushed to move toward the horizontal side of the inner wall of the slot 16, and the spring 2 19 is compressed at the same time, so that the outer surface of the workpiece abuts against the outer surface of the roller 18;

[0047] Then, the electromagnet 6 is energized and the workpiece is firmly adsorbed on the upper surface of the support plate 4 and the placement groove 5, the hydraulic cylinder 3 is started, and the support plate 4, the workpiece and the piston column 11 are driven to move downward synchronously, the hydraulic oil in the inner cavity of the transmission cavity 12 is compressed, and then the piston column 13 is driven to contract toward the axis side of the hydraulic cylinder 3, and the spring 14 is compressed, and the clamping block 15 and the roller 18 are driven to apply horizontal pressure toward the axis side of the workpiece. As the clamping block 15 continues to move, the roller 18 is gradually and completely squeezed into the slot 16, so that the workpiece abuts against the inner side of the clamping block 15;

[0048] Then, the pressure exerted by the clamping block 15 on the workpiece becomes greater and greater, so that the upward friction force generated between the workpiece and the clamping block 15 gradually becomes greater than the magnetic attraction force exerted by the placement groove 5 on the workpiece, and the diameter value of the piston column 11 is smaller than the inner diameter value of the transmission chamber 12, and the support plate 4 and the placement groove 5 begin to separate from the bottom of the workpiece. Subsequently, the hydraulic cylinder 3 is stopped to keep it in a predetermined position. At this time, the piston column 2 13 remains fixed, and the clamping block 15 clamps the workpiece. By controlling the magnetic attraction force of the placement groove 5, the clamping force of the clamping block 15 on the workpiece can be accurately controlled to complete the polishing clamping preparation of the workpiece.

[0049] Note: The top of the limit block 20 and the clamping block 15 designed in this device are always below the upper surface of the workpiece to facilitate the polishing mechanism to grind and polish the workpiece surface;

[0050] Finally, when facing a workpiece of a larger size, start the motor 8, and drive the rotating drum 22 and the sealing sleeve 24 to rotate 60°, so that the connecting hole 21 coincides with the oil drain hole 25, and the inner cavity of the transmission chamber 12 is connected with the inner cavity of the oil storage cylinder 7 through the connecting pipe 9. The bottom edge of the workpiece abuts against the upper surface of the limit block 20, and pushes the limit block 20 and the clamping block 15 to drive the piston column 13 to move horizontally toward the side away from the axis of the hydraulic cylinder 3. At this time, negative pressure is generated inside the connecting pipe 9, and a part of the hydraulic oil in the oil storage cylinder 7 is sucked into the inner cavity of the transmission chamber 12. At this time, the volume of the airbag 23 becomes larger. When the workpiece abuts against the inner side of the clamping block 15, start the motor 8 and drive the rotating drum 22 and the sealing sleeve 24 to rotate and reset, blocking the connection between the connecting pipe 9 and the inner cavity of the oil storage cylinder 7, and completing the adaptation work for workpieces of different sizes.

[0051] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0052] Although 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 present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A clamping tool for polishing flange forgings, comprising a bracket (1) and a fixing block (2), a hydraulic cylinder (3) being mounted on the top of the fixing block (2), a support plate (4) being fixedly mounted on the telescopic end of the hydraulic cylinder (3), a placement groove (5) being formed on the top of the support plate (4), an electromagnet (6) being fixedly mounted inside the placement groove (5), characterized in that: The outer circumferential surface of the fixed block (2) is provided with three groups of convex corners (26) arranged at equal angles. A transmission chamber (12) is opened at one end of the convex corner (26). The internal sealing sleeve of the transmission chamber (12) is provided with a piston column 2 (13) and a spring 1 (14). The top of the convex corner (26) is fixedly connected to a sealing cylinder (10). The internal sealing sleeve of the sealing cylinder (10) is provided with a piston column 1 (11). The top of the piston column 1 (11) is fixedly connected to the hydraulic cylinder (3). The bottom of the convex corner (26) is fixedly connected to a connecting pipe (9). An oil storage cylinder (7) is fixedly installed at the bottom of the fixed block (2). A motor (8) is installed at the bottom of the oil storage cylinder (7). The output shaft of the motor (8) extends to the inner cavity of the oil storage cylinder (7) and is fixedly connected to a rotating cylinder (22) located in the inner cavity of the oil storage cylinder (7). The outer surface of the rotating cylinder (22) is fixedly connected to a sealing sleeve (24). The outer surface of the cylinder (7) is provided with a plurality of communication holes (21) connected with the communication pipe (9), the outer surfaces of the rotating cylinder (22) and the sealing sleeve (24) are provided with a plurality of oil discharge holes (25), the top of the rotating cylinder (22) is fixedly connected with an air bag (23), the inner cavities of the transmission chamber (12), the communication pipe (9) and the oil storage cylinder (7) are all filled with hydraulic oil, one end of the piston column (13) is fixedly connected with a clamping block (15), the top of the clamping block (15) is fixedly installed with a limit block (20), the top of the clamping block (15) facing the piston column (13) is provided with a slot (16), a buffer frame (17) is slidably installed inside the slot (16), a roller (18) is rotatably installed outside the buffer frame (17), the inside of the buffer frame (17) is elastically connected with a spring (19), and the buffer frame (17) is elastically supported in the slot (16) by the spring (19).

2. The flange forging polishing clamping tool according to claim 1, characterized in that: The sealing sleeve (24) is made of a rubber block and is in sealing contact with the inner wall of the oil storage cylinder (7). The interior of the airbag (23) is filled with gas and is compressed by the hydraulic oil in the inner cavity of the oil storage cylinder (7).

3. A flange forging polishing clamping tool according to claim 2, characterized in that: The connecting pipes (9) are arranged in three groups and are fixedly connected to the outer surface of the oil storage cylinder (7) at equal angles. The oil drain holes (25) are arranged in three groups and are opened at equal angles on the outer surfaces of the rotating cylinder (22) and the sealing sleeve (24). The three groups of oil drain holes (25) and the three groups of connecting holes (21) are staggered.

4. The flange forging polishing clamping tool according to claim 3 is characterized in that: The axial cross-section of the piston column 2 (13) is in a "T" shape. The piston column 2 (13) is horizontally plugged into the inner wall of the transmission chamber (12). The connecting openings of the sealing cylinder (10), the connecting pipe (9) and the inner cavity of the transmission chamber (12) are connected to one end of a clamping block (15) near the piston column 2 (13). The two ends of the spring 1 (14) are elastically connected to the transmission chamber (12) and the other end of the piston column 2 (13) respectively.

5. The flange forging polishing clamping tool according to claim 4, characterized in that: The hydraulic oil is sealed against the bottom end of the piston column one (11) upwards and is sealed against the outer surface of the sealing sleeve (24) downwards. The hydraulic oil is sealed around the outer surface of the piston column two (13). Another group of hydraulic oil fills the inner cavity of the oil storage cylinder (7) and is sealed against the outer surface of the airbag (23).

6. The flange forging polishing clamping tool according to claim 5, characterized in that: The upper surface of the support plate (4) is kept flush with the bottom of the inner wall of the slot (16), and the vertical diameter of the roller (18) is located on one side of the inner cavity of the slot (16).

7. The flange forging polishing clamping tool according to claim 6, characterized in that: A gap X is left between one end of the buffer frame (17) located in the inner cavity of the slot (16) and the inner wall of the slot (16), and a maximum horizontal distance between the side of the clamping block (15) close to the second piston column (13) and the outer surface of the roller (18) is X.

8. The flange forging polishing clamping tool according to claim 7, characterized in that: The roller (18) and the sealing sleeve (24) are made of hard rubber, and the heights of the sealing sleeve (24) and the airbag (23) are both smaller than the depth of the inner cavity of the oil storage cylinder (7).

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