A carbon steel flange drilling tool

Abstract

The present invention provides a carbon steel flange drilling processing tool, which belongs to the field of flange processing technology. It includes a base, the upper surface of the base is fixedly installed with a limit mounting plate through a hollow support frame, and a driving mechanism, a transmission mechanism and a positioning mechanism are arranged below the limit mounting plate, and the positioning mechanism includes an inner arc clamping plate and an outer arc clamping plate, and the inner arc clamping plate and the outer arc clamping plate are both located on the circumferential outer surface of the limit mounting plate, and the inner arc clamping plate and the outer arc clamping plate are both provided with six groups, and the inner sides of the six groups of inner arc clamping plates are all provided with sliding limit plates, and the sliding limit plates are slidably installed inside the limit mounting plate; through the provided six groups of inner arc clamping plates and outer arc clamping plates, the inner and outer circles of the flange can be abutted at the same time, so that they interact with each other to clamp the flange in position, the radial positioning is accurate, the clamping force is uniform, and the uneven clamping force of the existing equipment is avoided, which causes the flange to deform or affects the subsequent drilling work.

Description

Technical Field

[0001] The invention belongs to the technical field of flange processing, and in particular relates to a carbon steel flange drilling processing tool. Background Art

[0002] Carbon steel flange, also known as flange flange or flange, is a part that connects pipes to each other and is used to connect pipe ends. It is also useful as flange on equipment inlet and outlet, used to connect two devices, such as reducer flange. Flange connection or flange joint refers to a detachable connection in which flange, gasket and bolts are connected to each other as a combined sealing structure. At present, in the processing of large flanges, it is necessary to punch holes in different positions of the flange.

[0003] In the existing technology, there are several core problems with flange drilling and positioning devices: first, the radial clamping force is uneven, especially the deformation problem of large-diameter flanges, which makes the flange positioning less accurate and affects the subsequent drilling work; second, the flange is not fixed in the vertical direction. During the subsequent drilling work, the vibration generated affects the flange, causing the vibration on the flange to be converted into vertical shaking or offset, affecting the flange quality.

[0004] Therefore, we propose a carbon steel flange drilling tooling to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to solve several core problems existing in the flange drilling and positioning device: first, the radial clamping force is uneven, especially the deformation problem of large-diameter flanges, which makes the flange positioning not accurate enough, affecting the subsequent drilling work; second, the flange is not fixed in the vertical direction. During the subsequent drilling work, the vibration generated affects the flange, causing the vibration of the flange to be converted into vertical shaking or offset, affecting the quality of the flange, and a carbon steel flange drilling tool is proposed.

[0006] The object of the present invention can be achieved through the following technical scheme: it includes a base, the upper surface of the base is fixedly mounted with a limit mounting plate through a hollow support frame, and a driving mechanism, a transmission mechanism and a positioning mechanism are arranged below the limit mounting plate, and the positioning mechanism includes an inner arc splint and an outer arc splint, and the inner arc splint and the outer arc splint are both located on the circumferential outer surface of the limit mounting plate, and the inner arc splint and the outer arc splint are each provided with six groups, and the inner sides of the six groups of the inner arc splints are each provided with a sliding limit plate, and the sliding limit plate is slidably mounted on the inside of the limit mounting plate, and the middle parts of the upper and lower surfaces of the six groups of the inner arc splints are movably connected with a movable wedge through a disc spring, and the expansion and contraction direction of the disc spring is perpendicular to the plane of the limit mounting plate, and the middle parts of the upper and lower surfaces of the six groups of the outer arc splints are each provided with a fixed wedge, and the inclined surface of the movable wedge is adapted to the inclined surface of the fixed wedge.

[0007] As a preferred embodiment of the present invention, the driving mechanism includes a servo motor, and the servo motor is arranged on the left front of the upper surface of the base, and the power output end of the servo motor is connected to a rotating shaft, and a spur gear 1 is provided at the upper end of the rotating shaft, and the right rear side of the spur gear 1 is meshed with a gear disk, and an arc groove is opened inside the gear disk, and the arc groove is an eccentric arc groove, and the distance between the end thereof close to the center of the gear disk and the center of the circle is less than the distance between the end thereof far from the center of the gear disk and the center of the circle, and the arc groove circumferential array is provided with six groups, and push rods are inserted into the inside of the six groups of arc grooves, and the upper ends of the six groups of push rods are respectively connected to the end of the lower surface of the six groups of sliding limit plates close to the middle of the gear disk through a ball joint, and the lower end of the push rod passes through the gear disk and is fixedly connected to a sliding stopper, and the diameter of the sliding stopper is greater than the width of the arc groove.

[0008] As a preferred embodiment of the present invention, a fixing column is provided in the middle of the upper surface of the base, the gear disc is rotatably mounted on the circumferential surface of the fixing column, and the upper end of the fixing column is fixedly connected to the middle of the lower surface of the limiting mounting plate.

[0009] As a preferred embodiment of the present invention, the transmission mechanism includes a hollow mounting plate, and six groups of hollow mounting plates are arranged in a circular array, and the inner middle of the six groups of hollow mounting plates are rotatably installed with a spur gear 2 through a rotating rod, and the upper and lower sides of the six spur gears 2 are meshed and connected with tooth plates, and the tooth plates on the upper and lower sides are respectively located at the upper left and lower right of the spur gear 2, and an insertion rod is provided on the upper surface of the six lower tooth plates close to the tooth disk. The six insertion rods are respectively hinged to the lower ends of the six sliding blocks through ball joints, and the upper surfaces of the six upper tooth plates away from the tooth disk are provided with vertical connecting rods, and the upper ends of the six vertical connecting rods are respectively fixedly connected to the lower surfaces of the six outer arc-shaped splints.

[0010] As a preferred embodiment of the present invention, movable grooves are provided on the front and rear inner walls of the hollow mounting plate, and support sliders are provided on the front and rear sides of the tooth plate, and the support sliders are slidably installed inside the corresponding movable grooves.

[0011] As a preferred embodiment of the present invention, the hollow mounting plate is located in the lower area of ​​the inner arc splint, the outer arc splint, the movable wedge and the fixed wedge, and the side of the fixed wedge away from the inner arc splint is at the same height as the side of the movable wedge away from the inner arc splint.

[0012] As a preferred embodiment of the present invention, an electric cylinder is provided on the upper surface of the base, and six groups of electric cylinders are provided and are synchronously raised and lowered through a central controller. The six groups of electric cylinders are all arranged on a circular path between the movable wedge and the fixed wedge, and the upper ends of the six groups of electric cylinders are all provided with an arc-shaped placement platform, and the arc-shaped placement platform is located above the hollow mounting plate.

[0013] As a preferred embodiment of the present invention, the six hollow mounting plates are arranged in the gaps between the six arc-shaped placement platforms, the spacing between the six arc-shaped placement platforms is greater than the width of the hollow mounting plates, and the upper surfaces of the six arc-shaped placement platforms together constitute a complete annular support surface.

[0014] As a preferred embodiment of the present invention, the limit mounting plate is a regular hexagonal star-shaped structure, and a slide groove 1 and a slide groove 2 are opened inside the six extension arms. The six sliding limit plates are respectively slidably installed inside the six slide grooves 1, and the upper parts of the six push rods are respectively slidably installed inside the six slide grooves 2.

[0015] As a preferred embodiment of the present invention, the tooth width of the second spur gear is greater than the tooth width of the tooth plate, and the end of the tooth plate is covered with an engineering plastic shock-absorbing sleeve.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) By setting up six sets of inner arc clamping plates and outer arc clamping plates, the inner and outer rings of the flange can be abutted at the same time, so that the flange can be clamped and positioned by interaction. The radial positioning is accurate and the clamping force is uniform, thus avoiding the uneven clamping force of the existing equipment, which causes flange deformation or affects the subsequent drilling work;

[0018] (2) By setting the fixed wedge, movable wedge and disc spring, after the inner and outer arc-shaped clamps clamp the flange, the movable wedge can clamp the flange in the vertical direction under the action of the fixed wedge and disc spring, thereby improving the positioning accuracy of the flange, avoiding the impact of vibration force on the flange during drilling, and improving the quality of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 2 It is a front cutaway perspective view of the present invention;

[0022] Figure 3 For the present invention Figure 2 A magnified view of the structure at point A;

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the position limiting mounting plate of the present invention;

[0024] Figure 5 It is a partially cutaway perspective view of the driving mechanism of the present invention;

[0025] Figure 6 It is a side sectional perspective view of the transmission mechanism of the present invention.

[0026] In the figure: 1. Base; 2. Hollow support frame; 3. Limit mounting plate; 31. Slide chute 1; 32. Slide chute 2; 4. Driving mechanism; 401. Servo motor; 402. Rotating shaft; 403. Spur gear 1; 404. Tooth plate; 405. Arc groove; 406. Push rod; 407. Sliding block; 5. Transmission mechanism; 501. Hollow mounting plate; 502. Spur gear 2; 503. Tooth plate; 504. Insert rod; 505. Vertical connecting rod; 506. Support slider; 507. Moving groove; 6. Positioning mechanism; 601. Inner arc splint; 602. Outer arc splint; 603. Sliding limit plate; 604. Disc spring; 605. Movable wedge; 606. Fixed wedge; 7. Electric cylinder; 8. Arc placement table; 9. Fixed column. DETAILED DESCRIPTION

[0027] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0028] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features being referred to. Thus, features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In the context of this disclosure, "a group" means two or more, unless otherwise specifically defined.

[0029] Throughout this specification, when a device is said to be "connected" to another device, this includes not only "direct connection" but also "indirect connection" with other elements interposed therebetween. Furthermore, when a device is said to "include" a certain component, unless otherwise stated, this does not exclude the inclusion of other components but rather implies that the device may include other components.

[0030] Although the terms first, second, etc. are used in some examples herein to refer to various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first interface and a second interface, etc. are used. Furthermore, as used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context indicates otherwise.

[0031] Although defined differently, all terms used herein, including technical and scientific terms, have the same meanings as those generally understood by those skilled in the art to which this disclosure belongs. Terms defined in commonly used dictionaries are supplementally interpreted as having meanings consistent with relevant technical literature and the current message, and unless otherwise defined, they should not be overly interpreted as ideal or highly formalized meanings.

[0032] See also Figure 1 - Figure 6 As shown, a carbon steel flange drilling tool comprises a base 1, the upper surface of the base 1 is fixedly mounted with a limited mounting plate 3 through a hollow support frame 2, a driving mechanism 4, a transmission mechanism 5 and a positioning mechanism 6 are arranged below the limited mounting plate 3, the driving mechanism 4 comprises a servo motor 401, and the servo motor 401 is arranged at the left front of the upper surface of the base 1, the power output end of the servo motor 401 is connected to the rotating shaft 402 through a coupling transmission, the upper end of the rotating shaft 402 is provided with a spur gear 1 403, the right rear side of the spur gear 1 403 is meshed with a gear disc 404, an arc groove 405 is opened inside the gear disc 404, the arc groove 405 is an eccentric arc groove, or it can also be an involute shape, and the main structure is that the distance between the end close to the center of the gear disc 404 and the center of the circle is less than its The distance between the end portion away from the center of the toothed disc 404 and the center of the circle can convert the rotational motion into radial linear displacement. There are six groups of arc grooves 405 arranged in a circumferential array. Push rods 406 are inserted into the interior of the six groups of arc grooves 405. The lower end of the push rod 406 passes through the toothed disc 404 and is fixedly connected to a sliding block 407. The diameter of the sliding block 407 is greater than the width of the arc groove 405. A fixing column 9 is provided in the middle of the upper surface of the base 1. The toothed disc 404 is rotatably mounted on the circumferential surface of the fixing column 9. The position of the toothed disc 404 can be fixed without affecting the rotation of the toothed disc 404. The upper end of the fixing column 9 is fixedly connected to the middle of the lower surface of the limit mounting plate 3. The setting of the fixing column 9 can fix the middle support of the limit mounting plate 3, thereby improving the stability of the limit mounting plate 3.

[0033] It should be noted that a wear-resistant copper lining is embedded in the arc groove 405, and a graphite lubrication groove is provided on the surface of the bushing to improve the movement life of the sliding block 407 and adapt to high-frequency processing. The eccentric design of the arc groove 405 makes it possible for the push rod 406 to drive the sliding block 407 to perform radial linear motion when the toothed disc 404 rotates. At the same time, the sliding block 407 slides with the arc groove 405, and its diameter is greater than the width of the arc groove 405 to form an axial limit. Therefore, the sliding block 407 can form an axial lock on the push rod 406 to prevent the push rod 406 from vertically offset and affecting the use effect.

[0034] The transmission mechanism 5 includes a hollow mounting plate 501, and the hollow mounting plate 501 is arranged in a circumferential array in six groups. The inner middle of each of the six hollow mounting plates 501 is rotatably mounted with a spur gear 2 502 through a rotating rod. The upper and lower sides of the six spur gears 2 502 are meshed with tooth plates 503. The upper and lower tooth plates 503 are respectively located at the upper left and lower right of the spur gear 2 502, so that when the spur gear 2 502 rotates, the two tooth plates 503 on the upper and lower sides will approach or move away from each other. The upper surface of the six lower end tooth plates 503 is close to the tooth disc 404. The ends are provided with insertion rods 504, and the six insertion rods 504 are hinged to the lower ends of the six sliding blocks 407 through ball joints, so that when the sliding blocks 407 move radially, they can simultaneously drive the corresponding insertion rods 504 to move radially. The ends of the upper surfaces of the six upper tooth plates 503 away from the tooth disc 404 are provided with vertical connecting rods 505. The inner walls of the front and rear sides of the hollow mounting plate 501 are provided with moving grooves 507. The front and rear sides of the tooth plate 503 are provided with supporting sliders 506, which are slidably installed in the corresponding moving grooves 507.

[0035] It should be noted that the setting of the movable groove 507 provides radial movement space for the support slider 506, so that when the tooth plate 503 moves radially, it can smoothly drive the support slider 506 to move radially inside the movable groove 507. The setting of the support slider 506 can limit the tooth plate 503 and install it inside the hollow mounting plate 501 without affecting the movement of the tooth plate 503.

[0036] The positioning mechanism 6 includes an inner arc splint 601 and an outer arc splint 602, and the inner arc splint 601 and the outer arc splint 602 are both located on the outer circumferential surface of the position-limiting mounting plate 3, wherein the outer side wall of the inner arc splint 601 and the inner side wall of the outer arc splint 602 are both provided with anti-slip patterns, and the anti-slip patterns are diamond-shaped grid patterns, which can increase the static friction between the contact surface of the splint and the flange and improve the clamping effect. The inner arc splint 601 and the outer arc splint 602 are both provided with six groups, six vertical The upper ends of the connecting rods 505 are fixedly connected to the lower surfaces of the six outer arc-shaped splints 602 respectively. When the six groups of inner arc-shaped splints 601 are opened, they can abut against the inner ring of the flange to be processed. The six groups of outer arc-shaped splints 602 are directly connected to the transmission mechanism 5 by the vertical connecting rods 505, and move synchronously with the inner arc-shaped splints 601 in the opposite direction, so that when the inner arc-shaped splints 601 expand outward, the six groups of outer arc-shaped splints 602 will shrink synchronously and abut against the outer ring of the flange, thereby Under the interaction of the splints 602, the flange is clamped and fixed to complete the positioning tooling, which is convenient for the subsequent drilling work of the flange. The inner sides of the six groups of inner arc splints 601 are all provided with sliding limit plates 603, and the sliding limit plates 603 are slidably installed inside the limit mounting plate 3. The upper ends of the six groups of push rods 406 are respectively connected to the ends of the lower surfaces of the six groups of sliding limit plates 603 near the middle of the toothed disc 404 through ball joints. The middle parts of the upper and lower surfaces of the six groups of inner arc splints 601 are all connected by disc springs. 604 is movably connected to a movable wedge 605, and the extension and contraction direction of the disc spring 604 is perpendicular to the plane of the limit mounting plate 3. A fixed wedge 606 is provided in the middle of the upper and lower surfaces of the six sets of outer arc-shaped clamping plates 602. The inclined surface of the movable wedge 605 is adapted to the inclined surface of the fixed wedge 606, and the inclined surface angle of the movable wedge 605 and the fixed wedge 606 is between 10° and 15°. When the inclined surface angle is 12°, the theoretical clamping force provided by the disc spring 604 is ≥800N.

[0037] It should be noted that when the toothed disc 404 rotates, the push rod 406 converts the rotational motion of the toothed disc 404 into radial linear motion of the sliding limit plate 603, which then smoothly drives the sliding limit plate 603 to move radially. The gap between the upper surface of the movable wedge 605 and the lower surface of the fixed wedge 606 is ≤0.1mm. At the same time, the movable wedge 605 is floatingly connected to the inner arc clamping plate 601 through the disc spring 604, and can float vertically by ±2mm, thereby ensuring that when the inner arc clamping plate 601 and the outer arc clamping plate 602 are close to each other to clamp the flange, the inclined surfaces of the movable wedge 605 and the fixed wedge 606 can be fully in contact, and then the fixed wedge 606 can push the movable wedge 605 a short distance toward the flange, so that the wedge can fix the longitudinal limit of the flange, further improving the positioning effect of the flange.

[0038] Preferably, the hollow mounting plate 501 is located in the lower area of ​​the inner arc-shaped clamping plate 601, the outer arc-shaped clamping plate 602, the movable wedge 605 and the fixed wedge 606. The side of the fixed wedge 606 away from the inner arc-shaped clamping plate 601 and the side of the movable wedge 605 away from the inner arc-shaped clamping plate 601 are at the same height, so that when the inner arc-shaped clamping plate 601 and the outer arc-shaped clamping plate 602 are close to each other to position the flange, the inclined surface of the fixed wedge 606 can accurately contact the inclined surface of the movable wedge 605, so that the wedge can position the flange in the vertical direction;

[0039] Preferably, the limit mounting plate 3 is a regular hexagonal star-shaped structure, and the six extension arms are each provided with a slide groove 1 31 and a slide groove 2 32. The six sliding limit plates 603 are respectively slidably mounted inside the six slide grooves 1 31, and the sliding limit plates 603 are embedded in the slide groove 1 31 of the limit mounting plate 3 to achieve radial sliding. The upper parts of the six push rods 406 are respectively slidably mounted inside the six slide grooves 2 32, providing activity space for the push rods 406, so that the push rods 406 can move radially smoothly. The tooth width of the spur gear 2 502 is greater than the tooth width of the tooth plate 503, and the end of the tooth plate 503 is covered with an engineering plastic shock-absorbing sleeve. The difference in tooth width and the setting of the shock-absorbing sleeve ensure that the meshing area between the tooth plate 503 and the spur gear 2 502 is redundant, thereby increasing the anti-slip effect.

[0040] Preferably, an electric cylinder 7 is provided on the upper surface of the base 1, and the electric cylinder 7 is provided with six groups and is synchronously lifted and lowered by a central controller. The six groups of electric cylinders 7 are evenly distributed in a ring. The setting of the central controller enables the six groups of electric cylinders 7 to be lifted and lowered synchronously, and the lifting accuracy is ±0.01mm, so as to avoid the impact of their asynchronous effect on the placement of the flange. The six groups of electric cylinders 7 are all arranged on a circular path between the movable wedge 605 and the fixed wedge 606. The upper ends of the six groups of electric cylinders 7 are all provided with an arc-shaped placement platform 8, and the arc-shaped placement platform 8 is located on the upper side of the hollow mounting plate 501. On the other hand, six hollow mounting plates 501 are arranged in the gaps between the six arc-shaped placement platforms 8. The spacing between the six arc-shaped placement platforms 8 is greater than the width of the hollow mounting plates 501. The upper surfaces of the six arc-shaped placement platforms 8 together constitute a complete annular support surface. Among them, the setting of the gaps between the six arc-shaped placement platforms 8 is to provide movable space for the inner arc-shaped splint 601, the outer arc-shaped splint 602, the movable wedge 605 and the fixed wedge 606 to prevent the splint and the wedge from contacting the arc-shaped placement platform 8 and affecting the movement.

[0041] When the present invention is used, the flange to be processed is first placed on the annular support surface formed by the six groups of arc-shaped placement tables 8, and then the servo motor 401 is started. The servo motor 401 drives the rotating shaft 402 and the spur gear 1 403 to rotate. The rotation of the spur gear 1 403 drives the gear plate 404 to rotate. The rotation of the gear plate 404 causes the six groups of push rods 406 inside it to move radially inside the arc-shaped groove 405, and then pushes the sliding limit plate 603 connected above and the sliding stop block 407 connected below to move radially.

[0042] The six sets of sliding limit plates 603 move toward the outside of the limit mounting plate 3 of the regular hexagonal star-shaped structure, which can simultaneously drive the six sets of inner arc clamping plates 601 to open outward, so that the outer walls of the six sets of inner arc clamping plates 601 abut against the inner wall of the flange;

[0043] The sliding stopper 407 moves away from the fixed column 9, which can push the lower tooth plate 503 to move away from the fixed column 9. Then, the lower tooth plate 503 drives the upper tooth plate 503 to move toward the fixed column 9 through the spur gear 2 502. Then, the upper tooth plate 503 drives the outer arc-shaped clamping plate 602 to move toward the fixed column 9 through the vertical connecting rod 505. After the inner arc-shaped clamping plate 601 abuts the inner ring of the flange, the outer arc-shaped clamping plate 602 abuts the outer ring of the flange at the same time, so that the flange is preliminarily fixed under the clamping position of the inner arc-shaped clamping plate 601 and the outer arc-shaped clamping plate 602.

[0044] During the process of the inner arc splint 601 expanding outward and the outer arc splint 602 shrinking inward, the movable wedge 605 and the fixed wedge 606 on the inner arc splint 601 and the outer arc splint 602 are also approaching each other. When the inner arc splint 601 and the outer arc splint 602 respectively abut against the inner and outer rings of the flange, the fixed wedge 606 will also contact the movable wedge 605 and push the movable wedge 605 a short distance toward the flange, so that the wedge can abut against the upper and lower surfaces of the flange, and fix the flange in the vertical direction. At this time, the device completes the positioning work of the flange, among which the positioning positions of the fixed wedge 606 and the movable wedge 605 are pre-designed positions where drilling work will not be performed on the flange. Then the six groups of electric cylinders 7 are started at the same time, driving the arc placement table 8 to move downward a certain distance, so that drilling work can be performed on the flange. The downward movement of the arc placement table 8 is mainly to prevent the drilling equipment from damaging the arc placement table 8 when drilling a hole through the flange later.

[0045] The preferred embodiments of the present invention disclosed above are intended only to help illustrate the present invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the present invention to specific embodiments. Obviously, many modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A carbon steel flange drilling tool, comprising a base (1), wherein a limit mounting plate (3) is fixedly mounted on the upper surface of the base (1) via a hollow support frame (2), characterized in that: A driving mechanism (4), a transmission mechanism (5) and a positioning mechanism (6) are provided below the limit mounting plate (3). The positioning mechanism (6) includes an inner arc-shaped clamping plate (601) and an outer arc-shaped clamping plate (602). The inner arc-shaped clamping plate (601) and the outer arc-shaped clamping plate (602) are both located on the outer circumferential surface of the limit mounting plate (3). Six groups of the inner arc-shaped clamping plates (601) and the outer arc-shaped clamping plates (602) are provided. The inner sides of the six groups of the inner arc-shaped clamping plates (601) are all provided with sliding limit plates (601). 03), and the sliding limit plate (603) is slidably mounted inside the limit mounting plate (3), the middle parts of the upper and lower surfaces of the six groups of inner arc-shaped clamping plates (601) are movably connected to movable wedges (605) through disc springs (604), and the expansion and contraction direction of the disc springs (604) is perpendicular to the plane of the limit mounting plate (3), and the middle parts of the upper and lower surfaces of the six groups of outer arc-shaped clamping plates (602) are provided with fixed wedges (606), and the inclined surface of the movable wedges (605) is adapted to the inclined surface of the fixed wedges (606); The driving mechanism (4) includes a servo motor (401), and the servo motor (401) is arranged on the left front of the upper surface of the base (1). The power output end of the servo motor (401) is connected to the rotating shaft (402). The upper end of the rotating shaft (402) is provided with a spur gear (403). The right rear side of the spur gear (403) is meshed with a toothed disc (404). The toothed disc (404) has an arc groove (405) formed inside. The arc groove (405) is an eccentric arc groove, and the distance between the end of the arc groove close to the center of the toothed disc (404) and the center of the circle is The arc groove (405) is arranged in a circumferential array in six groups. Push rods (406) are inserted into the interior of each of the six groups of arc grooves (405). The upper ends of the six groups of push rods (406) are respectively connected to one end of the lower surface of the six groups of sliding limit plates (603) close to the middle of the gear disc (404) through a ball joint. The lower end of the push rod (406) passes through the gear disc (404) and is fixedly connected to a sliding block (407). The diameter of the sliding block (407) is greater than the width of the arc groove (405).

2. A carbon steel flange drilling tool according to claim 1, characterized in that: A fixing column (9) is provided in the middle of the upper surface of the base (1), the toothed disc (404) is rotatably mounted on the circumferential surface of the fixing column (9), and the upper end of the fixing column (9) is fixedly connected to the middle of the lower surface of the limiting mounting plate (3).

3. The carbon steel flange drilling tool according to claim 1, characterized in that: The transmission mechanism (5) includes a hollow mounting plate (501), and the hollow mounting plate (501) is arranged in a circumferential array in six groups. The inner middle of each of the six groups of hollow mounting plates (501) is rotatably mounted with a spur gear 2 (502) through a rotating rod. The upper and lower sides of the six spur gears 2 (502) are meshed with tooth plates (503). The tooth plates (503) on the upper and lower sides are respectively located on the upper left and lower right sides of the spur gear 2 (502). The tooth plates at the lower ends of the six An insert rod (504) is provided at one end of the upper surface of the (503) close to the toothed disc (404), and the six insert rods (504) are hinged to the lower ends of the six sliding blocks (407) through ball joints. A vertical connecting rod (505) is provided at one end of the upper surface of the six upper toothed plates (503) away from the toothed disc (404), and the upper ends of the six vertical connecting rods (505) are fixedly connected to the lower surfaces of the six outer arc-shaped clamping plates (602).

4. A carbon steel flange drilling tool according to claim 3, characterized in that: The front and rear inner walls of the hollow mounting plate (501) are both provided with movable grooves (507), and the front and rear inner walls of the tooth plate (503) are both provided with supporting sliders (506), and the supporting sliders (506) are slidably mounted inside the corresponding movable grooves (507).

5. The carbon steel flange drilling tool according to claim 3, characterized in that: The hollow mounting plate (501) is located in a lower area of ​​the inner arc-shaped clamping plate (601), the outer arc-shaped clamping plate (602), the movable wedge (605) and the fixed wedge (606), and the side of the fixed wedge (606) away from the inner arc-shaped clamping plate (601) is at the same height as the side of the movable wedge (605) away from the inner arc-shaped clamping plate (601).

6. The carbon steel flange drilling tool according to claim 5, characterized in that: An electric cylinder (7) is provided on the upper surface of the base (1), and six groups of electric cylinders (7) are provided and are synchronously raised and lowered by a central controller. The six groups of electric cylinders (7) are all arranged on a circular path between a movable wedge (605) and a fixed wedge (606). An arc-shaped placement platform (8) is provided at the upper end of the six groups of electric cylinders (7), and the arc-shaped placement platform (8) is located above the hollow mounting plate (501).

7. The carbon steel flange drilling tool according to claim 6, characterized in that: The six hollow mounting plates (501) are arranged at the gaps between the six arc-shaped placement platforms (8), the spacing between the six arc-shaped placement platforms (8) is greater than the width of the hollow mounting plates (501), and the upper surfaces of the six arc-shaped placement platforms (8) together form a complete annular support surface.

8. The carbon steel flange drilling tool according to claim 3, characterized in that: The limit mounting plate (3) is a regular hexagonal star-shaped structure, and a slide groove (31) and a slide groove (32) are provided inside the six extension arms. The six sliding limit plates (603) are respectively slidably mounted inside the six slide grooves (31), and the upper parts of the six push rods (406) are respectively slidably mounted inside the six slide grooves (32).

9. The carbon steel flange drilling tool according to claim 3, characterized in that: The tooth width of the second spur gear (502) is greater than the tooth width of the tooth plate (503), and the end of the tooth plate (503) is covered with an engineering plastic shock-absorbing sleeve.

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