A quick clamping device for flange grinding

Abstract

The present application relates to a quick clamping device for flange grinding and processing, and relates to the technical field of clamping devices. A quick clamping device for flange grinding and processing includes a base, a limiting assembly, and a driving assembly. The limiting assembly and the driving assembly are both placed in a receiving hole opened in the base; the limiting assembly includes a limiting seat and a plurality of claws, the claws are rotatably connected to the limiting seat, and the plurality of claws are arranged around the outer periphery of the limiting seat to form a mesh-like limiting space. The driving assembly can drive the limiting seat to move to change the size of the limiting space. In the process of clamping the flange, the claws rotate toward the center of the base, the limiting space shrinks, and the end of the claw is pressed against the flange placed in the limiting space. The plurality of claws apply a load with an inclination angle to the end face of the flange to prevent the flange from moving, thereby improving stability.

Description

Technical Field

[0001] The present application relates to the technical field of clamping devices, and in particular to a quick clamping device for flange grinding. Background Art

[0002] A flange is a connecting element used to connect pipes, valves, and equipment. Its primary function is to provide sealing and support. It typically consists of a flat or raised disc-shaped part with fixing holes and threaded holes. It is used to connect different pipes or equipment and fasten them together with bolts.

[0003] In order to ensure the sealing performance of the flange, the end face of the flange needs to be polished to make the end face sufficiently flat and smooth. During polishing, the flange needs to be fixed by a clamping device. The clamping device mainly includes a main body and a screw and a slider arranged in the main body; wherein the screw is connected to the slider and drives the slider to move. During polishing, the flange is placed on the main body and the screw is rotated so that the slider abuts against the flange to complete the fixation.

[0004] This connection method limits the flange by pressing the side wall of the flange, while the flange is free in the vertical direction and may disengage from the slider during the pressing process, resulting in low stability when clamping the flange. Summary of the Invention

[0005] The purpose of this application is to provide a clamping device for flange grinding processing that can be clamped quickly.

[0006] The present application provides a quick clamping device for flange grinding, which adopts the following technical solution:

[0007] A quick clamping device for flange grinding processing comprises a base, a limiting assembly and a driving assembly, wherein the limiting assembly and the driving assembly are both placed in a receiving hole provided in the base;

[0008] The limiting assembly includes a limiting seat and a plurality of claws, the claws are rotatably connected to the limiting seat, and the plurality of claws are arranged around the outer periphery of the limiting seat to form a mesh-shaped limiting space. The driving assembly can drive the limiting seat to move to change the size of the limiting space.

[0009] By adopting the above technical solution, the driving assembly is started, and the driving assembly drives the limit seat to move vertically upward. Under the action of the inner wall of the accommodating hole, the claw body rotates toward the center of the base body, the limit space shrinks, and the end of the claw body is pressed against the flange placed in the limit space. Multiple claw bodies apply an inclined load to the end face of the flange to prevent the flange from moving, and the stability is higher.

[0010] Optionally, the claw body includes a rod body and a limiting member, the rod body is arranged in an arc shape, and the limiting member is connected to an end of the rod body away from the limiting seat and can be pressed with the end face of the flange.

[0011] By adopting the above technical solution, the flange to be polished is placed on the base. When the driving assembly drives the limit seat to rise, the rod body abuts against the wall of the accommodating hole. Under the action of the wall of the accommodating hole, the rod body rotates, driving the limit piece to move toward the center of the flange until it is pressed against the end face of the flange to complete the clamping.

[0012] Optionally, the limiting member includes a limiting block, a pull rod and an elastic element, the limiting block is slidably connected to the rod body, two ends of the elastic element are respectively connected to the limiting block and the pull rod, and the pull rod is used to pull the limiting block.

[0013] By adopting the above technical solution, when the limit piece moves toward the center direction of the flange until the limit block is pressed against the flange, the pull rod pulls the elastic element to stretch, and the stretched elastic element further pulls the limit block. The limit block under tension begins to gradually increase the clamping force on the flange to adjust the clamping force. When the flange is polished, the drive motor drives the limit seat to descend vertically. At this time, the pulling force of the pull rod on the elastic element gradually decreases, and the limit block returns to the starting position to complete the unlocking. The flange is not only subjected to the clamping force from the rod body side, but also to the clamping force from the pull rod side, thereby improving the clamping effect.

[0014] Optionally, the base includes a base and a chuck connected to the base, a limiting hole is provided on the chuck, and the rod portion extends out of the limiting hole and is rotatably connected to the limiting seat.

[0015] By adopting the above technical solution, the limiting hole can limit the rod body. In the process of the limiting block pressing the flange, the rod body is restricted by the wall surface of the limiting hole, making it difficult for the rod body to shake, ensuring that the limiting block can press the flange more stably and improve the stability of the device.

[0016] Optionally, the limiting block can abut against a peripheral area located at the limiting hole.

[0017] By adopting the above technical solution, the limit block is difficult to pass through the limit hole. The limit block is limited by the surrounding area of ​​the limit hole to prevent the limit block from passing through the limit hole due to excessive clamping force, thereby improving the stability of the clamping flange.

[0018] Optionally, the driving assembly includes a driving motor and a lead screw, the driving motor and the lead screw are rotatably connected, and the lead screw passes through the limit seat and drives the limit seat to move up and down.

[0019] By adopting the above technical solution, when the flange needs to be tightened, the drive motor is started, and the rotating screw drives the limit seat to rise. Under the action of the accommodating hole, the claw body rotates, and the limit block contacts the flange end face and presses the flange. When the grinding is completed, the drive motor is reversed, and the claw body rotates to expand the limit space. The relevant personnel take out the polished flange, which is convenient to operate and improves the efficiency of flange processing.

[0020] Optionally, a limiting sleeve and a plurality of limiting rods are connected to the chuck, a plurality of hidden holes matching the limiting rods are opened on the limiting sleeve, and the limiting sleeve is adjustable up and down.

[0021] By adopting the above technical solution, when the flange is placed on the chuck, the flange is aligned with the hidden hole and the limit sleeve is pressed downward. The limit sleeve drops to expose the limit rod, and the flange is smoothly placed on the limit rod to pre-fix it before clamping the flange, ensuring stability when grinding the flange.

[0022] Optionally, the chuck is provided with a limiting groove and a reset member is provided in the limiting groove, the reset member includes a sector-shaped stopper and a reset rod, the sector-shaped stopper is fixedly connected to the limiting groove, and the reset rod is sleeved on the outer end of the lead screw and driven to rotate by the lead screw;

[0023] The limiting sleeve includes a first pressing plate, a second pressing plate and several fixing rods. The second pressing plate is placed in the limiting groove. The fixing rods extend into the limiting groove and are respectively connected to the first pressing plate and the second pressing plate. The bottom side of the second pressing plate and both sides of the reset rod are provided with ramp blocks.

[0024] By adopting the above technical solution, when the flange needs to be polished, the flange is placed on the limit sleeve and the limit sleeve is pressed. The limit rod fixes the flange, and then the drive motor is started to make the limit block press the flange. When the flange is polished, the drive motor rotates in the opposite direction. At this time, the lead screw drives the reset rod to rotate. The reset rod will contact the ramp block and apply a vertical upward thrust. The horizontal thrust applied by the ramp block to the reset rod is not enough to hinder the rotation of the reset rod, so that the limit sleeve rises vertically, lifts the flange, reduces the obstruction of the chuck wall, and facilitates relevant personnel to remove it.

[0025] Optionally, a first thread groove and a second thread groove are respectively provided at both ends of the lead screw, the limit seat is threadedly connected to the lead screw through the first thread groove, and the reset rod is threadedly connected to the lead screw through the second thread groove, and the pitch of the first thread groove is greater than the pitch of the second thread groove.

[0026] By adopting the above technical solution, the reset rod rises more slowly than the limit seat, so as to reduce the situation where the reset rod rises too quickly and causes the top surface of the reset rod to lift the second pressure plate, and reduce the interference of the reset rod in the process of clamping the flange of the claw body. At the same time, the slower rising speed also makes the final rising distance of the reset rod smaller, and its depth can be appropriately reduced when opening the limit groove to ensure the overall strength of the chuck.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. In this application, the flange is clamped by a claw body. When the flange needs to be clamped, the driving assembly is started, and the driving assembly drives the limit seat to move vertically upward. Under the action of the inner wall of the accommodating hole, the claw body rotates toward the center of the base, the limit space shrinks, and the end of the claw body is pressed against the flange placed in the limit space. Multiple claw bodies apply an inclined load to the end face of the flange to prevent the flange from moving, and the stability is higher.

[0029] 2. The limiter in the present application includes a limit block, an elastic element and a pull rod. When the limiter moves toward the center of the flange until the limit block is pressed against the flange, the pull rod pulls the elastic element to stretch it, and the stretched elastic element further pulls the limiter. The limiter block under tension begins to gradually increase the clamping force on the flange to adjust the clamping force. When the flange is polished, the drive motor drives the limit seat to descend vertically. At this time, the pulling force of the pull rod on the elastic element gradually decreases, and the limiter returns to the starting position to complete the unlocking. The flange is subjected to the clamping force not only from the rod body side, but also from the pull rod side, thereby improving the clamping effect.

[0030] 3. The limit sleeve in this application is adjustable up and down. When the flange needs to be polished, the flange is placed on the limit sleeve and the limit sleeve is pressed. The limit rod fixes the flange, and then the drive motor is started to make the limit block press the flange. When the flange is polished, the drive motor rotates in the opposite direction. At this time, the screw drives the reset rod to rotate. The reset rod will contact the ramp block and apply a vertical upward thrust. The horizontal thrust applied by the ramp block to the reset rod is not enough to hinder the rotation of the reset rod, so that the limit sleeve rises vertically, lifts the flange, reduces the obstruction of the chuck wall, and facilitates relevant personnel to remove it. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic cross-sectional view of a quick clamping device for flange grinding in the present application;

[0032] Figure 2 It is a schematic diagram of the three-dimensional structure of the limit assembly and the drive assembly in this application;

[0033] Figure 3 yes Figure 1A schematic diagram of the partially enlarged structure of part A;

[0034] Figure 4 It is a schematic diagram of the three-dimensional structure of the limit sleeve in this application;

[0035] Figure 5 It is a schematic cross-sectional structural diagram of the chuck in this application.

[0036] In the figure, 1, base; 11, receiving hole; 111, first inner hole; 112, second inner hole; 113, slide groove; 12, base; 13, chuck; 131, limiting hole; 132, limiting groove; 2, limiting assembly; 21, limiting seat; 211, movable block; 212, connecting rod; 213, slider; 214, connecting hole; 22, claw body; 221, rod body; 2211, sliding groove; 222, limiting member; 2221, Limit block; 2222, pull rod; 2223, elastic element; 2224, connecting block; 23, limit space; 3, drive assembly; 31, drive motor; 32, lead screw; 321, first thread groove; 322, second thread groove; 4, limit sleeve; 41, hidden hole; 42, first pressure plate; 43, second pressure plate; 44, fixing rod; 5, limit rod; 6, reset member; 61, fan-shaped block; 62, reset rod; 7, ramp block. DETAILED DESCRIPTION

[0037] The following is combined with Figure 1 -Attached Figure 5 , further details of this application are given.

[0038] A quick clamping device for flange grinding, refer to Figure 1 and Figure 2 , including a base 1, a limiting assembly 2 and a driving assembly 3, the limiting assembly 2 and the driving assembly 3 are both placed in the accommodating hole 11 opened in the base 1; the limiting assembly 2 includes a limiting seat 21 and a plurality of claws 22, the plurality of claws 22 are arranged around the outer periphery of the limiting seat 21 to form a mesh-like limiting space 23, and the driving assembly 3 can drive the limiting seat 21 to move to change the size of the limiting space 23.

[0039] Reference Figure 1 The base 1 includes a base 12 and a chuck 13. The base 1 is provided with a receiving hole 11. The receiving hole 11 is arranged in a stepped shape, including a first inner hole 111 and a second inner hole 112. The aperture size of the first inner hole 111 is smaller than the aperture size of the second inner hole 112. The chuck 13 is placed in the first inner hole 111, and the driving assembly 3 is placed in the second inner hole 112. The chuck 13 and the driving assembly 3 are both detachably connected to the base 12.

[0040] Reference Figure 1A sliding groove 113 is also provided on the side wall of the second inner hole 112. The limiting seat 21 includes a movable block 211 and connecting rods 212 symmetrically arranged on both sides of the movable block 211. The connecting rod 212 and the movable block 211 are integrally formed. A slider 213 is also fixed on the side of the connecting rod 212 away from the movable block 211, and the slider 213 is placed in the sliding groove 113.

[0041] Reference Figure 1 and Figure 2 The connecting seat is driven up and down by the driving assembly 3. The driving assembly 3 includes a driving motor 31 and a screw 32. The driving motor 31 is detachably connected to the center of the bottom wall of the second inner hole 112 by bolts. The driving motor 31 and the screw 32 are rotatably connected. The screw 32 passes through the movable block 211 and is threadedly connected to the movable block 211. When the motor drives the screw 32 to rotate, the limit seat 21 slides along the length direction of the slide groove 113.

[0042] Reference Figure 1 and Figure 2 The claw body 22 includes a rod body 221 and a limiting member 222. The limiting member 222 is connected to the end of the rod body 221 away from the limiting seat 21 and can be pressed against the side wall of the flange. The rod body 221 is arranged in an arc shape, and a plurality of connecting holes 214 are opened on the outer periphery of the movable block 211. One end of the rod body 221 extends into the connecting hole 214 and is rotatably connected to the movable block 211. Specifically, the number of connecting holes 214 needs to be set according to the number of claw bodies 22. In this embodiment, the number of claw bodies 22 is 4. The 4 claw bodies 22 are evenly surrounded by the outer periphery of the movable block 211 and are arranged one by one in the 4 connecting holes 214 to improve the stability of the claw body 22 in limiting the flange.

[0043] When the flange needs to be clamped, the drive motor 31 is started, the screw 32 rotates and drives the limit seat 21 to rise vertically. During the rising process, the arc-shaped side wall of the rod body 221 will abut against the step surface formed between the first inner hole 111 and the second inner hole 112, thereby causing the rod body 221 to rotate. At this time, the rod body 221 rotates toward the center line direction close to the limit seat 21, the limit space 23 shrinks, and the flange is clamped. When the flange is polished, the drive motor 31 is reversed, the limit space 23 opens, and the relevant personnel take out the flange.

[0044] Reference Figure 1 and Figure 2 In order to improve the stability of the claw body 22 limiting the flange, a limiting hole 131 is opened on the chuck 13, and the rod body 221 partially passes through the limiting hole 131 and is rotatably connected to the movable block 211, wherein the outer wall of the rod body 221 abuts against the inner wall of the limiting hole 131 to prevent the rod body 221 from shaking.

[0045] Reference Figure 1 and Figure 3 The limiting member 222 includes a limiting block 2221, a pull rod 2222 and an elastic element 2223. The limiting block 2221 is slidably connected to the rod body 221, and the two ends of the elastic element 2223 are respectively connected to the limiting block 2221 and the pull rod 2222. In this embodiment, the elastic element 2223 is preferably a spring. In order to improve the connection stability between the spring and the limiting block 2221 and the pull rod 2222, the two ends of the spring are also fixedly connected with a connecting block 2224, wherein a sliding groove 2211 is provided on the rod body 221, and the connecting block 2224 and the spring are both placed in the sliding groove 2211, while the limiting block 2221 is spherically arranged and placed outside the sliding groove 2211, and is detachably connected to the connecting block 2224 through a pin shaft.

[0046] Reference Figure 3 The pull rod 2222 is set in an L shape, and the pull rod 2222 is hinged to another connecting block 2224. When the railing rises and rotates toward the center line of the chuck 13, the pull rod 2222 pulls the limit block 2221, and the clamping force of the limit block 2221 on the flange increases to complete the clamping of the flange, wherein the limit block 2221 can abut against the peripheral area of ​​the limit hole 131 to prevent the limit block 2221 from sliding out of the limit hole 131.

[0047] Reference Figure 2 and Figure 4 The chuck 13 is connected to a limiting sleeve 4 and several limiting rods 5. In this embodiment, the number of limiting rods 5 is 4 and they are evenly fixed on the chuck 13. The limiting sleeve 4 is slidably connected to the chuck 13, and its upper and lower positions are adjustable. The limiting sleeve 4 is provided with a plurality of hidden holes 41 that match the limiting rods 5. The number of limiting rods 5 is set according to the number of bolt holes on the flange to be clamped. When the flange is placed on the chuck 13, the flange is aligned with the hidden holes 41 and the limiting sleeve 4 is pressed downward. The limiting sleeve 4 descends, exposing the limiting rods 5, and the flange is smoothly sleeved on the limiting rods 5 to be pre-fixed before the flange is clamped.

[0048] Reference Figure 1 and Figure 5 The chuck 13 is provided with a limiting groove 132 and a reset member 6 is arranged in the limiting groove 132. The reset member 6 includes a fan-shaped block 61 and a reset rod 62, wherein the height of the fan-shaped block 61 is consistent with the depth of the limiting groove 132, and the height of the reset rod 62 is less than the opening depth of the limiting groove 132. Specifically, the height of the reset rod 62 is one-fourth of the opening depth of the limiting groove 132. The fan-shaped block 61 is fixedly connected to the limiting groove 132, and the screw rod extends into the limiting groove 132 and is connected to the reset rod 62. The screw rod drives the reset rod 62 to rotate. When it rotates a certain angle, the reset rod 62 is blocked by the fan-shaped block 61 and stops rotating.

[0049] Reference Figure 4The limiting sleeve 4 includes a first pressing plate 42, a second pressing plate 43 and a plurality of fixing rods 44. The first pressing plate 42 and the second pressing plate 43 are connected by a plurality of fixing rods 44, wherein the first pressing plate 42 is placed at the upper end of the chuck 13, and the second pressing plate 43 is placed in the limiting groove 132. The fixing rod 44 partially extends into the limiting groove 132 and is respectively connected to the first pressing plate 42 and the second pressing plate 43, wherein the first pressing plate 42 and the second pressing plate 43 are both circularly arranged to match the shape of the flange and better support the flange.

[0050] Reference Figure 1 Figure 4 In order to enhance the overall strength of the chuck 13, the outer diameter of the second pressure plate 43 is smaller than the inner diameter of the first pressure plate 42 to reduce the size of the limit groove 132. In addition, a distance is maintained between the first pressure plate 42 and the reset rod 62 in the vertical direction. When the second pressure plate 43 moves downward, the outer peripheral side wall of the second pressure plate 43 does not contact the fan-shaped block 61.

[0051] Reference Figure 4 The bottom side of the second pressure plate 43 has a ramp block 7, and the number of the ramp blocks 7 is two. The two ramp blocks 7 are symmetrically arranged. When the flange is polished, the drive motor 31 rotates in the opposite direction. At this time, the screw 32 drives the reset rod 62 to rotate. The reset rod 62 will contact the ramp block 7 and apply a vertical upward thrust. The horizontal thrust applied by the ramp block 7 to the reset rod 62 is not enough to hinder the rotation of the reset rod 62, so that the limit sleeve 4 rises vertically, lifting the flange, making it convenient for relevant personnel to remove it.

[0052] Furthermore, in order to improve the smoothness of the reset rod 62 in pushing the limit sleeve 4 to rise vertically, ramp blocks 7 are also provided on both sides of the reset rod 62, wherein the ramp block 7 on the reset rod 62 has a ramp surface on the upper side, while the ramp block 7 on the second pressure plate 43 has a ramp surface on the lower side. When the reset rod 62 rotates, the two ramp surfaces act on each other, and the reset rod 62 pushes up the second pressure plate 43.

[0053] Reference Figure 1 The limit seat 21 and the reset rod 62 are both threadedly connected to the screw 32. The two ends of the screw 32 are respectively provided with a first thread groove 321 and a second thread groove 322. The limit seat 21 is threadedly connected to the screw 32 through the first thread groove 321, and the reset rod 62 is threadedly connected to the screw 32 through the second thread groove 322.

[0054] When the reset rod 62 is not blocked by the sector block 61 , the reset rod 62 rotates together with the lead screw 32 . When the reset rod 62 is blocked by the sector block 61 , the reset rod 62 also rises vertically like the limiting seat 21 .

[0055] Reference Figure 1In order to prevent the reset rod 62 from rising too quickly and lifting the limit sleeve 4, the pitch of the first thread groove 321 is greater than the pitch of the second thread groove 322. In other embodiments, the limit groove 132 can also be opened deep enough, and the pitch of the first thread groove 321 and the second thread groove 322 can also be set to be equal to reduce the difficulty of processing the screw 32.

[0056] The implementation principle of the embodiment of the present application is as follows: the flange is placed on the limiting sleeve 4 and the limiting sleeve 4 is pressed. At this time, the limiting rod 5 emerges from the limiting sleeve 4 and is inserted into the bolt hole of the flange to complete the initial fixation. Then, the driving motor 31 is started. Driven by the lead screw 32, the limiting seat 21 rises vertically. At this time, the claw body 22 rotatably connected to the limiting seat 21 is affected by the step surface of the receiving hole 11. While rising, it also rotates toward the center of the chuck 13, and the limiting block 2221 gradually approaches the end face of the flange.

[0057] At the same time, the pull rod 2222 pulls the connecting block 2224, causing the spring to stretch. The limit block 2221 is subjected to the gradually increasing tension transmitted by the spring and presses the flange more and more tightly. The flange is fixed and the relevant personnel begin to polish the flange.

[0058] When the grinding is completed, the driving motor 31 is reversed, the limit seat 21 starts to move vertically downward, and the reset rod 62 is no longer hindered by the fan-shaped block 61. It rotates with the screw 32. During the rotation, the reset rod 62 will contact the ramp block 7 and apply a vertical upward thrust. The horizontal thrust applied by the ramp block 7 to the reset rod 62 is not enough to prevent the reset rod 62 from rotating, so that the limit sleeve 4 rises vertically, lifting the flange to facilitate relevant personnel to remove it.

[0059] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A quick clamping device for flange grinding, characterized in that: The invention comprises a base (1), a limiting assembly (2) and a driving assembly (3), wherein the limiting assembly (2) and the driving assembly (3) are both placed in a receiving hole (11) provided in the base (1); the base (1) comprises a base (12) and a chuck (13) connected to the base (12); the base 1 is provided with a receiving hole 11, the receiving hole 11 is arranged in a stepped shape, and comprises a first inner hole 111 and a second inner hole 112, the aperture of the first inner hole 111 being smaller than the aperture of the second inner hole 112, the chuck 13 being placed in the first inner hole 111, and the driving assembly 3 being placed in the second inner hole 112; the driving assembly (3) comprises a driving motor (31) and a lead screw (32); The limiting assembly (2) includes a limiting seat (21) and a plurality of claw bodies (22), wherein the claw bodies (22) are rotatably connected to the limiting seat (21), and the plurality of claw bodies (22) are arranged around the periphery of the limiting seat (21) to form a mesh-shaped limiting space (23), and the driving assembly (3) can drive the limiting seat (21) to move so as to change the size of the limiting space (23); the claw body (22) includes a rod body (221) and a limiting member (222), and the limiting member (222) includes a limiting block (2221), a pull rod (2222) and an elastic element (2223), the limiting block (2221) is slidably connected to the rod body (221), and both ends of the elastic element (2223) are respectively connected to the limiting The block (2221) is connected to the pull rod (2222), the pull rod 2222 is L-shaped, and the pull rod 2222 is hinged to the connecting block 2224. When the railing rises and rotates toward the center line of the chuck 13, the pull rod 2222 pulls the limit block 2221; the chuck (13) is connected to the limit sleeve (4) and a plurality of limit rods (5); the chuck (13) is provided with a limit groove (132) and a reset member (6) is provided in the limit groove (132), the reset member (6) includes a fan-shaped block (61) and a reset rod (62), the fan-shaped block (61) is fixedly connected to the limit groove (132), and the reset rod (62) is sleeved on the outer end of the lead screw (32) and is driven to rotate by the lead screw (32); The limiting sleeve (4) includes a first pressing plate (42), a second pressing plate (43) and a plurality of fixing rods (44), the second pressing plate (43) is placed in the limiting groove (132), the fixing rod (44) extends into the limiting groove (132) and is respectively connected to the first pressing plate (42) and the second pressing plate (43), and the bottom side of the second pressing plate (43) and the two sides of the reset rod (62) are provided with a ramp block (7); the two ends of the lead screw (32) are respectively provided with a first thread groove (321) and a second thread groove (322), the limiting seat (21) is threadedly connected to the lead screw (32) through the first thread groove (321), and the reset rod (62) is threadedly connected to the lead screw (32) through the second thread groove (322), and the pitch of the first thread groove (321) is greater than the pitch of the second thread groove (322).

2. A quick clamping device for flange grinding according to claim 1, characterized in that: The rod body (221) is arranged in an arc shape, and the limiting member (222) is connected to an end of the rod body (221) away from the limiting seat (21) and can be pressed against the end face of the flange.

3. A quick clamping device for flange grinding according to claim 1, characterized in that: A limiting hole (131) is provided on the chuck (13), and a portion of the rod body (221) extends out of the limiting hole (131) and is rotatably connected to the limiting seat (21).

4. A quick clamping device for flange grinding according to claim 3, characterized in that: The limiting block (2221) can abut against a peripheral area located at the limiting hole (131).

5. A quick clamping device for flange grinding according to claim 3, characterized in that: The driving motor (31) and the lead screw (32) are rotatably connected, and the lead screw (32) passes through the limit seat (21) and drives the limit seat (21) to move up and down.

6. A quick clamping device for flange grinding according to claim 5, wherein the limiting sleeve (4) is provided with a plurality of hidden holes (41) matching the limiting rod (5), and the limiting sleeve (4) is adjustable up and down.

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