A variable-diameter flange inner hole grinding device

Abstract

The present invention relates to the technical field of variable-diameter flange processing, and discloses a variable-diameter flange inner hole grinding device, which includes a base. A moving seat is slidably arranged on the slide rail at the top of the base. A processing table is arranged on the moving seat. A grinding mechanism is arranged in the processing table. A positioning mechanism is arranged on the front side of the base. The grinding mechanism includes a fixed rod, a displacement driving mechanism, a rotation driving mechanism, a transmission ring table, a displacement disc and an extension mechanism. A grinding head is arranged on the extension mechanism. The rotation driving mechanism drives the transmission ring table and the displacement disc to rotate. The transmission ring table drives the extension mechanism to rotate. The displacement driving mechanism cooperates with the rotation driving mechanism and the displacement disc to make the extension mechanism expand. This device realizes the adjustable grinding of the variable-diameter inner hole of the variable-diameter flange. The structure is closely matched. Through the design of the grinding mechanism, the grinding head can change the rotation radius, so that the grinding head can adapt to the irregular variable-diameter inner hole and continuously grind it.

Description

Technical Field

[0001] The present invention relates to the technical field of processing variable-diameter flange plates, and specifically refers to an inner hole grinding device for variable-diameter flange plates. Background Art

[0002] During the manufacturing stage of variable-diameter flange plates, processes such as casting, forging, welding, and cutting are successively carried out. For medium and large-sized variable-diameter flange plates, after casting, forging, and cooling are completed, the oxide layer needs to be removed by cutting. At this time, the surface of the flange plate has obvious cutting marks, and the flatness of the surface and inner hole of the flange plate needs to be improved by grinding.

[0003] The grinding of the outer surface of medium and large-sized variable-diameter flange plates is relatively simple, while the grinding of the inner hole of the variable-diameter pipe is more troublesome. Some processing factories still use handheld grinding machines for operation, and some factories use industrial robots to replace manual operation, and use a robotic arm to operate a grinding device for grinding. By using this method, positioning and rotating equipment need to be equipped to enable the medium and large-sized variable-diameter flange plates to achieve axis positioning and rotation functions, and cooperate with the robotic arm to complete the grinding work of the inner hole of the variable-diameter pipe. The construction cost is relatively high and cannot be popularized. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the above difficulties and provide an inner hole grinding device for variable-diameter flange plates.

[0005] To solve the above technical problem, the technical solution provided by the present invention is: an inner hole grinding device for variable-diameter flange plates, including a base, a moving seat is slidably arranged on a slide rail at the top of the base, a processing table is arranged on the moving seat, a grinding mechanism is arranged inside the processing table, and a positioning mechanism is arranged on the front side of the base;

[0006] The grinding mechanism includes a fixed rod, a displacement driving mechanism, a rotation driving mechanism, a transmission ring platform, a displacement disk, and an extension mechanism. A grinding head is arranged on the extension mechanism. The rotation driving mechanism drives the transmission ring platform and the displacement disk to rotate. The transmission ring platform drives the extension mechanism to rotate. The displacement driving mechanism cooperates with the rotation driving mechanism and the displacement disk to expand the extension mechanism;

[0007] The extension mechanism includes a transmission table and a transmission ring. The transmission ring is rotatably matched with the fixed rod. A gear one is arranged at the end of the fixed rod. A transmission gear one meshing with the gear one is rotatably arranged on the side of the transmission ring. One side of the transmission gear one is hinged with a positioning plate. One end of the positioning plate is hinged with a transmission gear two meshing with the transmission gear one. The other side of the transmission gear two is rotatably matched with the transmission table and the grinding head is bolted on the other side. A spiral groove is arranged on the front side of the displacement disk. An arc-shaped platform matching with the spiral groove is arranged on the rear side of the transmission table. A positioning claw platform is arranged at the front end of the transmission ring platform. The transmission table is slidably arranged on the positioning claw platform.

[0008] As an improvement: The rotation driving mechanism includes a second motor and a rotating cylinder. A second gear is provided at the output end of the second motor, and a tooth groove meshing with the second gear is provided at the rear end of the driving rotating cylinder to drive the rotating cylinder to rotate. A spline platform is provided at the front end of the rotating cylinder, and a first spline groove and a second spline groove for cooperating with the spline platform are respectively provided inside the transmission ring platform and the displacement disc.

[0009] As an improvement: The displacement driving mechanism includes a cylinder and a sliding table. The sliding table is slidably arranged inside the processing table, and the output end of the cylinder is connected to the sliding table. A driving ring platform is provided on the rotating cylinder, and a groove for rotatably cooperating with the driving ring platform is provided inside the sliding table.

[0010] As an improvement: A limiting rod is provided at the front side of the sliding table, and a limiting slot for plugging and cooperating with the limiting rod is provided at the rear side of the transmission ring platform. A plurality of limiting slots are annularly distributed.

[0011] As an improvement: A positioning rotating groove is provided inside the displacement disc, and a positioning ring platform for rotatably cooperating with the positioning rotating groove is provided at the front end of the fixed rod.

[0012] As an improvement: Positioning sliding grooves are provided on both sides of the transmission table, and clamping platforms for slidably cooperating with the positioning sliding grooves are provided on the positioning claw platform.

[0013] As an improvement: A liquid outlet platform is provided at the front end of the fixed rod, and a liquid spraying mechanism is provided at the front side of the transmission ring. The liquid spraying mechanism includes a liquid distribution platform and a plurality of liquid spraying heads. The liquid spraying heads are communicated with the liquid distribution platform. The liquid distribution platform is fixed on the transmission ring and is in sealed rotational cooperation with the liquid outlet platform. A clamping platform for clamping the liquid spraying heads is provided on the transmission ring. A liquid storage tank and a pump are provided inside the base and are connected to the rear end interface of the central through hole of the fixed rod through a pipeline.

[0014] As an improvement: The positioning mechanism includes a positioning platform. Two first positioning platforms are hinged on the positioning platform. A first hydraulic cylinder is hinged on the positioning platform. The output end of the first hydraulic cylinder is hinged to the first positioning platform. The two groups of first positioning platforms and the first hydraulic cylinders are symmetrically arranged. A second hydraulic cylinder is provided on the positioning platform. A second positioning platform is provided at the output end of the second hydraulic cylinder. Card slots are provided on both the first positioning platform and the second positioning platform.

[0015] As an improvement: A first motor is provided on the base. A threaded column is provided at the output end of the first motor. A threaded hole for cooperating with the threaded column is provided at the bottom of the moving seat.

[0016] The beneficial effects of the present invention compared with the prior art are as follows: The device realizes the adjustable grinding of the variable-diameter inner hole of the variable-diameter flange. The structure is closely matched. Through the design of the grinding mechanism, the grinding head can change the rotation radius, so that the grinding head can adapt to the irregular variable-diameter inner hole and continuously grind it. Specifically:

[0017] 1. Through the design of the extension mechanism, the rotation radius of the grinding head can be changed. Through the gear matching design, when the grinding head revolves with the extension mechanism, it generates self-rotation, so that the rotation speed of the grinding head is greater than that of the rotating cylinder, which can improve the grinding efficiency and quality.

[0018] 2. Through the cooperation of the rotation drive mechanism, the displacement drive mechanism and the displacement disk, when the transmission ring platform is restricted from moving, the displacement disk drives the extension mechanism to deform and extend, and the grinding radius can be adjusted.

[0019] 3. Through the cooperation of the rotation drive mechanism, the transmission ring platform and the displacement disk, when the rotating cylinder rotates, it drives the transmission ring platform and the displacement disk to rotate synchronously, realizing the rotation of the extension mechanism and the high-speed grinding of the grinding head.

[0020] 4. Through the positioning mechanism, the fixation and positioning of the medium and large-sized variable-diameter flange are realized. The flange is clamped and fixed by the positioning table one, and the axis of the flange is positioned and adjusted by the positioning table two. Description of the Drawings

[0021] Figure 1 It is a schematic structural diagram of a variable-diameter flange inner hole grinding device of the present invention.

[0022] Figure 2 It is a schematic structural diagram of the grinding mechanism of a variable-diameter flange inner hole grinding device of the present invention. Figure 1 .

[0023] Figure 3 It is an exploded view of the grinding mechanism of a variable-diameter flange inner hole grinding device of the present invention.

[0024] Figure 4 It is a schematic structural diagram of the grinding mechanism of a variable-diameter flange inner hole grinding device of the present invention. Figure 2 .

[0025] Figure 5 It is a cross-sectional view of the grinding mechanism of a variable-diameter flange inner hole grinding device of the present invention.

[0026] Figure 6 It is a schematic structural diagram of the rotation drive mechanism of a variable-diameter flange inner hole grinding device of the present invention.

[0027] Figure 7 It is a schematic structural diagram of the transmission ring platform of a variable-diameter flange inner hole grinding device of the present invention.

[0028] Figure 8 It is a cross-sectional view of the displacement disk of a variable-diameter flange inner hole grinding device of the present invention.

[0029] Figure 9 It is an exploded view of the extension mechanism of a variable-diameter flange inner hole grinding device of the present invention.

[0030] Figure 10 is a schematic diagram of the structure of the extension mechanism of a variable-diameter flange inner hole grinding device of the present invention Figure 1 。

[0031] Figure 11 is a schematic diagram of the structure of the extension mechanism of a variable-diameter flange inner hole grinding device of the present invention Figure 2 。

[0032] Figure 12 is a schematic diagram of the structure of the liquid spraying mechanism of a variable-diameter flange inner hole grinding device of the present invention.

[0033] Figure 13 is a schematic diagram of the structure of the positioning mechanism of a variable-diameter flange inner hole grinding device of the present invention.

[0034] As shown in the figure: 1. Base; 2. Grinding mechanism; 3. Fixed rod; 4. Displacement driving mechanism; 5. Rotation driving mechanism; 6. Transmission ring table; 7. Displacement disk; 8. Extension mechanism; 9. Positioning mechanism; 11. Moving seat; 12. Processing table; 13. Motor 1; 14. Threaded column; 31. Gear 1; 32. Liquid outlet table; 33. Positioning ring table; 41. Cylinder; 42. Slide table; 421. Limiting rod; 51. Motor 2; 511. Gear 2; 52. Rotating cylinder; 521. Tooth groove; 522. Driving ring table; 523. Spline table; 61. Spline groove 1; 62. Limiting slot; 63. Positioning claw table; 64. Clamping table; 71. Spline groove 2; 72. Spiral groove; 73. Positioning rotating groove; 81. Transmission table; 811. Positioning chute; 812. Arc table; 82. Transmission ring; 821. Clamping table; 83. Positioning plate; 84. Transmission gear 1; 85. Transmission gear 2; 86. Liquid spraying mechanism; 861. Liquid distribution table; 862. Liquid spraying head; 87. Grinding head; 91. Positioning platform; 92. Positioning table 1; 93. Card slot; 94. Hydraulic cylinder 1; 95. Hydraulic cylinder 2; 96. Positioning table 2. Specific embodiments

[0035] The present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Combined with the attached Figure 1 、attached Figure 2 and attached Figure 3As shown in the figure, a grinding device for the inner hole of a reducing flange includes a base 1. A moving seat 11 is slidably arranged on the top of the base 1. A processing table 12 is arranged on the moving seat 11. A grinding mechanism 2 is arranged on the processing table 12. The grinding mechanism 2 includes a fixed rod 3, a displacement driving mechanism 4, a rotation driving mechanism 5, a transmission ring table 6, a displacement disk 7 and an extension mechanism 8. A grinding head 87 is arranged on the extension mechanism 8. The rotation driving mechanism 5 drives the transmission ring table 6 and the displacement disk 7 to rotate. The transmission ring table 6 drives the extension mechanism 8 to rotate. The displacement driving mechanism 4 cooperates with the rotation driving mechanism 5 and the displacement disk 7 to expand the extension mechanism 8.

[0037] Combined with the attached Figure 7 、attached Figure 8 、attached Figure 9 、attached Figure 10 and attached Figure 11 As shown in the figure, the extension mechanism 8 includes a transmission table 81 and a transmission ring 82. The transmission ring 82 is rotatably matched with the fixed rod 3. A first gear 31 is arranged at the end of the fixed rod 3. A first transmission gear 84 meshing with the first gear 31 is rotatably arranged on the side of the transmission ring 82. A positioning plate 83 is hinged on one side of the first transmission gear 84. A second transmission gear 85 meshing with the first transmission gear 84 is hinged at one end of the positioning plate 83. The second transmission gear 85 is rotatably matched with the transmission table 81 on one side and the grinding head 87 is bolted on the other side. A spiral groove 72 is arranged on the front side of the displacement disk 7. An arc-shaped table 812 matching with the spiral groove 72 is arranged on the rear side of the transmission table 81. A positioning rotating groove 73 is arranged inside the displacement disk 7. A positioning ring table 33 rotatably matched with the positioning rotating groove 73 is arranged at the front end of the fixed rod 3. A positioning claw table 63 is arranged at the front end of the transmission ring table 6. The transmission table 81 is slidably arranged on the positioning claw table 63. Positioning sliding grooves 811 are arranged on both sides of the transmission table 81. Clamping tables 64 slidably matched with the positioning sliding grooves 811 are arranged on the positioning claw table 63.

[0038] Working principle of the extension mechanism 8: The rotation driving mechanism 5 drives the transmission ring table 6 and the displacement plate 7 to rotate. The transmission ring table 6 cooperates with the transmission table 81 through the positioning claw table 63, enabling the transmission table 81 to only move radially. The spiral groove 72 cooperates with the arc-shaped table 812. When the displacement plate 7 rotates and the transmission ring table 6 does not rotate, the spiral groove 72 drives the arc-shaped table 812, causing the transmission table 81 to slide on the positioning claw table 63. When the displacement plate 7 and the transmission ring table 6 rotate synchronously, the spiral groove 72 and the positioning claw table 63 lock the transmission table 81. With the common rotation of the displacement plate 7 and the transmission ring table 6, the extension mechanism 8 is driven to rotate and the internal deformation structure is locked. Since the position of the transmission table 81 is determined and the angle of the positioning plate 83 is fixed, the transmission table 81 drives the transmission ring 82 to rotate. Since the first gear 31 is fixed, the rotation of the transmission ring 82 drives the first transmission gear 84 to revolve. At the same time, the first gear 31 meshes with the first transmission gear 84 to drive the first transmission gear 84 to rotate while revolving. The first transmission gear 84 meshes with the second transmission gear 85 to drive the second transmission gear 85 to drive the grinding head 87 to rotate, thereby grinding the inner hole of the variable-diameter flange. When the position of the transmission table 81 changes, due to the hinge relationship of the positioning plate 83, the first transmission gear 84 and the second transmission gear 85 always remain in the meshing state, and at the same time, the transmission ring 82 rotates to a certain extent.

[0039] Combined with the attached Figure 4 , the attached Figure 5 and the attached Figure 6 As shown in the attached

[0040] Working principle of the rotation driving mechanism 5: The second motor 51 drives the second gear 511 to rotate. Through the meshing transmission between the second gear 511 and the tooth groove 521, the rotating cylinder 52 is driven to rotate. The spline platform 523 at the front end of the rotating cylinder 52 drives the transmission ring table 6 and the displacement plate 7 to rotate through the cooperation with the first spline groove 61 and the second spline groove 71. The rotating cylinder 52 is driven to move back and forth by the displacement driving mechanism 4. During the movement, the second gear 511 and the tooth groove 521 always remain in the meshing state, and the spline platform 523 slides in the first spline groove 61 and the second spline groove 71. When it is necessary to drive the extension mechanism 8 to rotate, the spline platform 523 cooperates with the first spline groove 61 and the second spline groove 71 at the same time. When it is necessary to drive the extension mechanism 8 to expand, the spline platform 523 disengages from the first spline groove 61 and only cooperates with the second spline groove 71. At this time, the rotating cylinder 52 drives the displacement plate 7 to rotate, causing the transmission table 81 to slide on the positioning claw table 63.

[0041] Combined with the attached Figure 3, Attachment Figure 5 and Attachment Figure 7 As shown in Figure 5 and Figure 7 , the position-changing driving mechanism 4 includes a cylinder 41 and a slide table 42. The slide table 42 is slidably disposed inside the processing table 12. The output end of the cylinder 41 is connected to the slide table 42. A driving ring table 522 is provided on the rotating cylinder 52. A groove that rotatably cooperates with the driving ring table 522 is provided inside the slide table 42. A limiting rod 421 is provided on the front side of the slide table 42. A limiting slot 62 that is inserted and cooperates with the limiting rod 421 is provided on the rear side of the transmission ring table 6. A plurality of limiting slots 62 are annularly distributed.

[0042] Working principle of the position-changing driving mechanism 4: During normal grinding work, the rotating cylinder 52 rotates inside the slide table 42. When it is necessary to change the grinding radius, the cylinder 41 pushes the slide table 42 to slide inside the processing table 12. Through the cooperation between the driving ring table 522 and the groove inside the slide table 42, the rotating cylinder 52 is driven to move back and forth, realizing the position change of the spline table 523 between the first spline groove 61 and the second spline groove 71, thereby realizing the switching between the rotation and extension of the extension mechanism 8. In order to ensure that the transmission ring table 6 does not rotate when the position-changing disk 7 rotates, during the process of the spline table 523 entering the first spline groove 61, the limiting rod 421 is inserted into the limiting slot 62 to prevent the transmission ring table 6 from rotating.

[0043] Combined with Attachment Figure 1 and Attachment Figure 12 As shown in Figure 1 and Figure 12 , a liquid outlet table 32 is provided at the front end of the fixed rod 3. A liquid spraying mechanism 86 is provided on the front side of the transmission ring 82. The liquid spraying mechanism 86 includes a liquid distribution table 861 and a plurality of liquid spraying heads 862. The liquid spraying heads 862 are communicated with the liquid distribution table 861. The liquid distribution table 861 is fixed on the transmission ring 82 and is in sealed rotational cooperation with the liquid outlet table 32. A clamping table 821 for clamping the liquid spraying heads 862 is provided on the transmission ring 82. A liquid storage tank and a pump are provided inside the base 1 and are connected to the rear end interface of the central through hole of the fixed rod 3 through a pipeline.

[0044] Working principle of the liquid spraying mechanism 86: In order to more conveniently spray the grinding liquid onto the grinding area, the liquid spraying mechanism 86 is provided at the front end of the fixed rod 3. During grinding, the pump transports the grinding liquid in the liquid storage tank to the central through hole of the fixed rod 3 through the pipeline until it reaches the position of the liquid outlet table 32. During the rotation of the liquid distribution table 861 with the transmission ring 82, the grinding liquid is sprayed onto the inner hole of the variable-diameter flange through the liquid spraying heads 862, improving the grinding efficiency and quality.

[0045] Combined with Attachment Figure 1 and Attachment Figure 13As shown in the figure, a positioning mechanism 9 is provided on the front side of the base 1. The positioning mechanism 9 includes a positioning platform 91. Two first positioning platforms 92 are hinged on the positioning platform 91. A first hydraulic cylinder 94 is hinged on the positioning platform 91. The output end of the first hydraulic cylinder 94 is hinged to the first positioning platform 92. The two groups of first positioning platforms 92 and the first hydraulic cylinder 94 are symmetrically arranged. A second hydraulic cylinder 95 is provided on the positioning platform 91. A second positioning platform 96 is provided at the output end of the second hydraulic cylinder 95. Clamping grooves 93 are provided on both the first positioning platform 92 and the second positioning platform 96.

[0046] Working principle of the positioning mechanism 9: The reducing flange is transported above the positioning mechanism 9 by a transportation device such as a crane. Subsequently, the large-diameter ring platform of the reducing flange is aligned with the clamping groove 93 on the first positioning platform 92. After adjusting the position, the first hydraulic cylinder 94 drives the first positioning platform 92 to rotate, so that the first positioning platform 92 clamps the large-diameter ring platform. Subsequently, the second hydraulic cylinder 95 jacks up the second positioning platform 96, so that the second positioning platform 96 pushes the small-diameter ring platform to move up and down, adjusts the axis position of the reducing flange, and makes the axis of the reducing flange coincide with the working axis of the grinding mechanism.

[0047] Combined with the attached Figure 1 As shown in the figure, a first motor 13 is provided inside the base 1. A threaded column 14 is provided at the output end of the first motor 13. A threaded hole matching the threaded column 14 is provided at the bottom of the moving seat 11. Sliding grooves that are slidably matched with the sliding rails on the base 1 are provided on both sides of the bottom of the moving seat 11. The first motor 13 drives the threaded column 14 to rotate. The threaded column 14 is matched with the threaded hole at the bottom of the moving seat 11, driving the moving seat 11 to slide on the sliding rails.

[0048] When the present invention is specifically implemented, the reducing flange is placed on the positioning mechanism 9, fixed after adjusting the angle. Subsequently, the moving seat 11 drives the grinding mechanism 2 to approach the reducing flange. The grinding head 87 at the end of the grinding mechanism 2 extends into the inside of the reducing pipe. Subsequently, the displacement driving mechanism 4 drives the extension mechanism 8 to expand. The polishing liquid is sprayed onto the inner hole of the reducing pipe through the liquid spraying mechanism 86 by a pump. Subsequently, the rotation driving mechanism 5 drives the extension mechanism 8 to rotate, driving the grinding head 87 to rotate, and grinding the inner hole of the reducing pipe. Through the gear transmission design of the extension mechanism 8, the grinding head 87 rotates around its own axis while revolving with the extension mechanism 8. Moreover, through the gear ratio, the rotation speed of the grinding head 87 is much greater than the rotation speed of the rotating cylinder 52. The polishing radius of the grinding head 87 can be changed. According to requirements, a gear meshing transmission can be added between the first transmission gear 84 and the second transmission gear 85 to change the rotation direction of the second transmission gear 85 and further increase the rotation speed of the second transmission gear 85.

[0049] The above describes the present invention and its embodiments. Such description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. In general, if those of ordinary skill in the art are inspired by it and, without departing from the gist of the present invention, design similar structural modes and embodiments to this technical solution without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A device for grinding the inner hole of a variable diameter flange, comprising a base (1), a movable seat (11) being slidably provided on the top of the base (1), a processing table (12) being provided on the movable seat (11), and a grinding mechanism (2) being provided in the processing table (12), characterized in that: The grinding mechanism (2) comprises a fixed rod (3), a displacement drive mechanism (4), a rotation drive mechanism (5), a transmission ring platform (6), a displacement disk (7) and an extension mechanism (8); a grinding head (87) is provided on the extension mechanism (8); the rotation drive mechanism (5) drives the transmission ring platform (6) and the displacement disk (7) to rotate; the transmission ring platform (6) drives the extension mechanism (8) to rotate; and the displacement drive mechanism (4) cooperates with the rotation drive mechanism (5) and the displacement disk (7) to expand the extension mechanism (8); The extension mechanism (8) comprises a transmission platform (81) and a transmission ring (82), wherein the transmission ring (82) is rotatably matched with the fixed rod (3), a gear 1 (31) is provided at the end of the fixed rod (3), a transmission gear 1 (84) meshing with the gear 1 (31) is rotatably provided on the side of the transmission ring (82), a positioning plate (83) is hingedly provided on one side of the transmission gear 1 (84), a transmission gear 2 (85) meshing with the transmission gear 1 (84) is hingedly provided on one end of the positioning plate (83), one side of the transmission gear 2 (85) is rotatably matched with the transmission platform (81), and a grinding head (87) is boltedly mounted on the other side, a volute groove (72) is provided on the front side of the displacement plate (7), an arc-shaped platform (812) aligned with the volute groove (72) is provided on the rear side of the transmission platform (81), a positioning claw platform (63) is provided at the front end of the transmission ring platform (6), and the transmission platform (81) is slidably arranged on the positioning claw platform (63); The rotation drive mechanism (5) comprises a second motor (51) and a rotating drum (52); a second gear (511) is provided at the output end of the second motor (51); a tooth groove (521) meshing with the second gear (511) is provided at the rear end of the driving rotating drum (52) to drive the rotating drum (52) to rotate; a spline platform (523) is provided at the front end of the rotating drum (52); and a first spline groove (61) and a second spline groove (71) cooperating with the spline platform (523) are respectively provided on the inner sides of the transmission ring platform (6) and the displacement plate (7); The displacement drive mechanism (4) comprises a cylinder (41) and a slide (42); the slide (42) is slidably arranged inside the processing table (12); the output end of the cylinder (41) is connected to the slide (42); a driving ring table (522) is arranged on the rotating cylinder (52); a groove rotatably matched with the driving ring table (522) is arranged on the inner side of the slide (42); a limit rod (421) is arranged on the front side of the slide (42); a limit slot (62) pluggably matched with the limit rod (421) is arranged on the rear side of the transmission ring table (6); and a plurality of limit slots (62) are distributed in a ring shape.

2. The device for grinding inner hole of a variable diameter flange according to claim 1, characterized in that: A positioning groove (73) is provided on the inner side of the displacement plate (7), and a positioning ring platform (33) rotatably matched with the positioning groove (73) is provided on the front end of the fixing rod (3).

3. The device for grinding inner hole of a variable diameter flange according to claim 1, characterized in that: Positioning slide grooves (811) are provided on both sides of the transmission platform (81), and a clamping platform (64) slidably matched with the positioning slide grooves (811) is provided on the positioning claw platform (63).

4. The device for grinding inner hole of a variable diameter flange according to claim 1, characterized in that: A liquid outlet platform (32) is provided at the front end of the fixed rod (3), and a liquid spraying mechanism (86) is provided at the front side of the transmission ring (82). The liquid spraying mechanism (86) comprises a liquid separation platform (861) and a plurality of liquid spraying heads (862). The liquid spraying heads (862) are connected to the liquid separation platform (861). The liquid separation platform (861) is fixed on the transmission ring (82) and is in sealing rotational cooperation with the liquid outlet platform (32). A clamping platform (821) for clamping the liquid spraying heads (862) is provided on the transmission ring (82). A liquid storage tank and a pump are provided in the base (1), which are connected to the rear end interface of the central through hole of the fixed rod (3) through a pipeline.

5. The device for grinding inner hole of a variable diameter flange according to claim 1, characterized in that: A positioning mechanism (9) is provided on the front side of the base (1), the positioning mechanism (9) comprising a positioning platform (91), two positioning platforms (92) being hingedly provided on the positioning platform (91), a hydraulic cylinder (94) being hingedly provided on the positioning platform (91), an output end of the hydraulic cylinder (94) being hingedly connected to the positioning platform (92), two sets of positioning platforms (92) and hydraulic cylinders (94) being symmetrically arranged, a hydraulic cylinder (95) being provided on the positioning platform (91), a positioning platform (96) being provided at the output end of the hydraulic cylinder (95), and a clamping slot (93) being provided on both the positioning platform (92) and the positioning platform (96).

6. The device for grinding inner hole of a variable diameter flange according to claim 1, characterized in that: The base (1) is provided with a motor 1 (13), the output end of the motor 1 (13) is provided with a threaded column (14), and the bottom of the movable base (11) is provided with a threaded hole that matches the threaded column (14).

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