A flange efficient tapping device and a tapping control method thereof

Abstract

The application relates to the technical field of tapping equipment, and discloses a high-efficiency tapping equipment for flange pieces and a tapping control method thereof. The equipment comprises a rack, a rotating disc, a plurality of rotating tools and a plurality of drilling and tapping integrated devices. The rotating disc is rotationally arranged on the rack and drives the plurality of rotating tools to synchronously revolve. The plurality of drilling and tapping integrated devices are arranged along the circumference of the rotating disc. Each drilling and tapping integrated device is provided with a drill bit and a tap arranged in sequence. A centrifugal clutch mechanism is arranged between the rotating tool and the rotating disc, and an intermittent transmission mechanism is arranged between the rotating tool and the rack. During the rotation of the rotating disc, the centrifugal clutch mechanism is separated, the intermittent transmission mechanism drives the rotating tool to rotate by a predetermined angle, and automatic rotation indexing of the flange piece is realized. The flange piece sequentially passes through the drilling and tapping integrated devices to complete drilling, tapping and automatic indexing machining, and until the machining of all screw holes is completed. The application realizes integrated and continuous machining of drilling and tapping of the flange piece, and improves machining efficiency and machining precision.

Description

Technical Field

[0001] This invention relates to the field of tapping equipment technology, and in particular to a high-efficiency tapping equipment for flanges and its tapping control method. Background Technology

[0002] Flanges are standard components for connecting pipes and pressure vessels, with quarter-section flanges being the most widely used. Machining the threaded holes on the end face of flanges requires two processes: drilling and tapping. Existing technology, such as patent publication number CN211966207U, discloses a flange tapping device. This device employs a single-station vertical tapping structure, relying on a screw clamp to hold the flange, and using a hollow tap with an internal oil circuit for tapping lubrication, thus successfully completing the single-point thread machining. However, the aforementioned existing technology only has an independent tapping function and lacks a pre-drilling unit. The workpiece must first have a pre-drilled pilot hole on another machine tool, leading to secondary positioning errors during cross-equipment transfer. Furthermore, when machining flange threaded holes, manual repeated loosening of the clamps is required to rotate the flange indexing, resulting in low batch processing efficiency. Summary of the Invention

[0003] To address the shortcomings of existing flange tapping equipment, this application provides a high-efficiency flange tapping device and its tapping control method.

[0004] In a first aspect, the present invention provides a high-efficiency tapping device for flanges, which adopts the following technical solution: A high-efficiency tapping device for flanges includes a frame, a turntable, multiple rotating fixtures, and multiple integrated drilling and tapping devices. The turntable is horizontally rotatably mounted on the frame and connected to a rotation drive assembly. The multiple rotating fixtures are mounted on the turntable around its axis, and the multiple integrated drilling and tapping devices are mounted on the frame around the axis of the turntable. Each integrated drilling and tapping device is equipped with a drill bit and a tap located above the same position of two adjacent rotating fixtures and distributed around the rotation direction of the turntable. A centrifugal clutch mechanism is provided between the rotating tooling and the turntable, and the centrifugal clutch mechanism disengages as the turntable rotates; an intermittent transmission mechanism is provided between the rotating tooling and the frame, and the intermittent transmission mechanism includes multiple first meshing parts and second meshing parts. The multiple first meshing parts are respectively disposed on multiple rotating tooling parts, and the multiple second meshing parts are respectively disposed between two adjacent drilling and tapping integrated devices. The intermittent transmission mechanism engages and drives the rotating tooling to rotate at an angle of 360° / N as the turntable rotates, where N is the number of bolt holes in the flange and the number of drilling and tapping integrated devices is equal to the number of bolt holes in the flange.

[0005] Preferably, the centrifugal clutch mechanism includes a centrifugal pin and multiple pin holes. The centrifugal pin is elastically connected to the turntable, and the multiple pin holes are evenly arranged circumferentially on the rotating fixture. The number of pin holes on the rotating fixture is equal to the number of screw holes on the flange. The centrifugal pin is inserted into one of the pin holes, and the centrifugal pin overcomes the elastic force and disengages from the pin hole as the turntable rotates.

[0006] Preferably, the intermittent transmission mechanism includes a gear ring and a rack. The gear ring is coaxially fixedly sleeved on the rotating tooling, and the rack is fixedly mounted on the frame. The gear ring intermittently meshes with the rack as the turntable rotates.

[0007] Preferably, the rotating fixture is provided with an internal support mechanism, which is used to automatically support the flange placed on the rotating fixture. The internal support mechanism includes a support rod, a sleeve, an internal support spring, a connecting rod, and a support plate. The support rod coaxially passes through the rotating fixture. The sleeve is fixedly disposed at the bottom of the turntable and sleeved onto the lower end of the support rod. The internal support spring is connected between the support rod and the sleeve. The support plate is slidably disposed on the rotating fixture. At least two support plates are provided. The outer side of the support plate is provided with a rubber pad. The inner side of the support plate is connected to the support rod through the connecting rod. The support rod and the connecting rod are connected by a connecting ring coaxially rotatably disposed on the support rod.

[0008] Preferably, the connecting ring is a damping ring, which restricts the rotating tooling to rotate only under the action of the intermittent transmission mechanism.

[0009] Preferably, an inner support adjustment assembly is provided between the frame and the inner support mechanism. The inner support adjustment assembly includes an adjustment rod and an abutment. The adjustment rod is horizontally connected to the lower end of the support rod. The sleeve has a clearance groove for the adjustment rod to pass through. The abutment is vertically limited and disposed on the frame. The abutment is located below the drill bit or tap. When the rotating fixture moves with the turntable to the drilling position or tapping position, the adjustment rod abuts against the abutment and the adjustment rod moves vertically after abutting to increase the tension of the inner support adjustment assembly.

[0010] Preferably, the abutment located below the drill bit is the first abutment, and the abutment located below the tap is the second abutment. The adjustment stroke of the adjusting rod after it abuts the first abutment is less than the adjustment stroke after it abuts the second abutment.

[0011] Preferably, the abutment is horizontally slidably mounted on the frame via a sliding rod. A return spring is connected to the abutment in the horizontal direction. A distance sensor is also provided on the frame in the sliding direction of the sliding rod. When the rotating fixture moves with the turntable to the drilling or tapping position, the adjusting rod abuts against the sliding rod, and the sliding rod slides horizontally after abutting. The distance sensor determines whether the rotating fixture is in position by monitoring the amount of sliding of the sliding rod.

[0012] Preferably, the rotating tooling has multiple machining clearance holes extending vertically through it, and these clearance holes are evenly distributed around the axis of the rotating tooling. The number of machining clearance holes is equal to the number of bolt holes on the flange. The turntable has a tooling groove for accommodating the rotating tooling, the bottom of which is in contact with the bottom surface of the rotating tooling. The tooling groove also has a chip removal hole extending vertically through the turntable. The upper end of the chip removal hole is movably aligned with the multiple machining clearance holes, and the lower end of the chip removal hole is connected to a receiving cylinder. A cylinder cover is movably provided at the bottom of the receiving cylinder.

[0013] Secondly, this invention provides a tapping control method for a high-efficiency tapping device for flanges, employing the following technical solution: A tapping control method for a high-efficiency tapping device for flanges, as described above, includes the following steps: First, the flange to be processed is placed on the rotating fixture. The flange passes through multiple drilling and tapping devices sequentially with the intermittent revolution of the turntable. When passing through each drilling and tapping device, the flange is first drilled at the drilling station below the drill bit, and then tapped at the tapping station below the tap, completing the processing of one threaded hole. The flange enters the next drilling and tapping device with the intermittent revolution of the turntable. During the revolution, based on the separation of the centrifugal clutch mechanism and the meshing transmission of the intermittent transmission mechanism, the rotating fixture will rotate synchronously to complete the rotation indexing of the flange. Then, the next threaded hole is processed in the next drilling and tapping device. This cycle is repeated multiple times. When the flange rotates back to the loading and unloading station, the drilling and tapping of multiple threaded holes will be completed.

[0014] The beneficial effects of this invention are as follows: 1. The flange high-efficiency tapping equipment of the present invention has both drilling and tapping functions, eliminating the need for pre-drilling the bottom hole on other machine tools, thereby avoiding secondary positioning errors caused by cross-equipment transfer; in addition, the rotary station can automatically rotate the flange indexing with the rotation of the turntable, eliminating the need for manual repeated loosening of the clamp to rotate the flange indexing, effectively improving processing efficiency. 2. The two support plates of the internal support mechanism can automatically support the flange installed on the rotating tooling under the action of the internal support spring, which facilitates loading and unloading and can quickly complete the initial positioning of the flange at the loading and unloading station. 3. When the flange reaches the drilling or tapping position with the rotating fixture, the inner support mechanism will automatically increase the tension on the flange under the adjustment of the inner support adjustment component, automatically complete the secondary positioning, and improve the stability of the flange during drilling or tapping. 4. The drilling station uses a relatively small internal support clamping force, which facilitates the flange to generate a small amount of controllable resonance. This not only helps to buffer the cutting impact of the drill bit and reduce the damage of the drill bit chipping, but also improves chip removal in the bottom hole. The tapping station uses a relatively large internal support clamping force, which fully compresses the rubber gasket, and the flange is completely rigidly fixed, eliminating processing vibration and ensuring the accuracy of thread processing. 5. As the rotating fixture rotates, the machining clearance holes of the rotating fixture will rotate sequentially through the chip removal holes, thereby pushing the chips that fall into the machining clearance holes during the machining process into the chip removal holes and the receiving cylinder in sequence, reducing the accumulation of chips on the equipment and facilitating the collection and recycling of machining chips. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the high-efficiency tapping device for flanges in the embodiments of this application; Figure 2 yes Figure 1 A magnified view of a section at point A in the middle; Figure 3 This is a schematic diagram of the rotating tooling in the embodiments of this application; Figure 4 This is a top view of the high-efficiency tapping device for flanges in the embodiments of this application; Figure 5 This is a top view of the turntable in an embodiment of this application.

[0016] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Turntable; 21. Receiving cylinder; 22. Cylinder cover; 3. Rotating fixture; 31. Machining clearance hole; 4. Flange; 5. Drilling and tapping integrated device; 51. Lifting mechanism; 52. Machining drive assembly; 53. Belt drive assembly; 54. Drill bit; 55. Tap; 61. Centrifugal pin; 62. Pin hole; 63. Connecting plate; 64. Centrifugal control rod; 71. Gear ring; 72. Gear rack; 81. Support rod; 82. Sleeve; 83. Connecting rod; 84. Support plate; 85. Rubber pad; 86. Connecting ring; 91. Adjusting rod; 92. Abutment part; 93. Sliding frame rod; 94. Mounting box. Detailed Implementation

[0017] The following will combine Figures 1-5 The present invention will be further illustrated by the embodiments.

[0018] This embodiment takes the tapping process of a four-part flange as an example to disclose a high-efficiency tapping device for flanges and its tapping control method.

[0019] Reference Figures 1 to 3 The high-efficiency tapping equipment for flanges includes a frame 1, a turntable 2, multiple rotating fixtures 3, and four integrated drilling and tapping devices 5. The turntable 2 is horizontally rotatably positioned at the top center of the frame 1. A rotation drive assembly is also located at the bottom center of the frame 1, connected to the turntable 2, and used to drive the turntable 2 to rotate counterclockwise. In this embodiment, the rotation drive assembly is a motor drive assembly.

[0020] Reference Figure 1 The rotating fixture 3 is used to place the flange 4 to be processed. Multiple rotating fixtures 3 are evenly arranged on the turntable 2 around the axis of the turntable 2. When the turntable 2 rotates, the multiple rotating fixtures 3 revolve around the axis of the turntable 2, so that the multiple rotating fixtures 3 can carry the flange 4 to move between different workstations.

[0021] Reference Figure 1 Four drilling and tapping integrated devices 5 are mounted on the frame 1 around the axis of the turntable 2. Specifically, each drilling and tapping integrated device 5 includes a lifting mechanism 51 and a processing drive assembly 52, a belt drive assembly 53, a drill bit 54, and a tap 55, all mounted on the lifting mechanism 51. The lifting mechanism 51 is driven by a cylinder located at the bottom of the frame 1. The processing drive assembly 52 is a motor drive assembly. The processing drive assembly 52 controls the forward or reverse rotation of the drill bit 54 and the tap 55 through the belt drive assembly 53, and, in conjunction with the lifting control of the lifting mechanism 51, drills or taps the flange 4. For the same drilling and tapping integrated device 5, the drill bit 54 and the tap 55 are located above the same position of two adjacent rotating fixtures 3, and are arranged sequentially around the rotation direction of the turntable 2, so that drilling is performed first and then tapping is performed. In this embodiment, since the turntable 2 rotates counterclockwise, the drill bit 54 and the tap 55 are arranged in a counterclockwise sequence. When the rotating fixture 3 carries the flange 4 to the bottom of the drill bit 54, the position of the flange 4 is the drilling position. When the rotating fixture 3 carries the flange 4 to the bottom of the tap 55, the position of the flange 4 is the tapping position.

[0022] Reference Figure 2A centrifugal clutch mechanism is provided between the rotating fixture 3 and the turntable 2. The centrifugal clutch mechanism disengages as the turntable 2 rotates and engages when the turntable 2 is stationary. When the centrifugal clutch mechanism is disengaged, the rotating fixture 3 can rotate under a certain external force. Therefore, the rotating fixture 3 needs to be equipped with a certain rotational damping to prevent it from easily rotating. When the centrifugal clutch mechanism is engaged, the rotating fixture 3 will lock, preventing it from rotating. Specifically, the centrifugal clutch mechanism includes a centrifugal pin 61 and multiple pin holes 62. One end of the centrifugal pin 61 is elastically connected to the outer circumferential surface of the turntable 2, and the other end is used to insert into the pin hole 62. The multiple pin holes 62 are evenly arranged circumferentially on the rotating fixture 3, and the number of pin holes 62 on the rotating fixture 3 corresponds to the number of bolt holes on the flange 4, which is four. When the turntable 2 rotates, the centrifugal pin 61 overcomes the elastic force and disengages from the pin hole 62 due to the centrifugal force. When the turntable 2 is stationary, the centrifugal pin 61 re-inserts into one of the pin holes 62 due to the disappearance of the centrifugal force and the elastic force. In this embodiment, one end of the centrifugal pin 61 is elastically connected to the outer circumferential surface of the turntable 2 through a connecting plate 63 and a centrifugal control rod 64. When the turntable 2 rotates or is stationary, the centrifugal pin 61 disengages from or inserts into the pin hole 62 under the control of the centrifugal control rod 64. Furthermore, the pin hole 62 is provided with a chamfered inlet to facilitate the re-insertion of the centrifugal pin 61 into the pin hole 62.

[0023] Reference Figures 1 to 4 An intermittent transmission mechanism is provided between the rotating tooling 3 and the frame 1. The intermittent transmission mechanism includes multiple first meshing parts and second meshing parts. The multiple first meshing parts are respectively set on multiple rotating tooling parts 3, and the multiple second meshing parts are respectively set between two adjacent drilling and tapping integrated devices 5. The intermittent transmission mechanism intermittently meshes and transmits power as the turntable 2 rotates, driving the rotating tooling 3 to rotate at an angle of 90°. The intermittent transmission mechanism includes a gear ring 71 and a rack 72. The gear ring 71 is coaxially fixedly sleeved on the rotating tooling 3, and the rack 72 is fixedly mounted on the frame 1. The gear ring 71 intermittently meshes with the rack 72 as the turntable 2 rotates, and after meshing with the rack 72, the gear ring 71 rotates on its own axis as the turntable 2 continues to rotate, thereby driving the rotating tooling 3 to rotate and complete the rotation indexing of the flange part 4.

[0024] Combination Figure 5Based on the above structure, the tapping control method for the four-part flange in this embodiment is as follows: First, the flange 4 to be processed is placed on the rotating fixture 3, so that the flange 4 passes through four drilling and tapping devices 5 in sequence as the turntable 2 rotates; during the process of passing through each drilling and tapping device 5, the flange 4 is first drilled at the drilling station below the drill bit 54, and then tapped at the tapping station below the tap 55, thereby completing the processing of one threaded hole. It should be noted that the turntable 2 needs to stop rotating during the drilling and tapping processes. The flange 4 moves while remaining stationary; after completing the machining of one screw hole, the flange 4 enters the next drilling and tapping device 5 as the turntable 2 rotates again. During this process, based on the separation of the centrifugal clutch mechanism and the meshing transmission of the intermittent transmission mechanism, the rotating fixture 3 will rotate 90° before entering the drilling station of the next drilling and tapping device 5 to complete the rotation indexing of the flange 4 for drilling and tapping the second screw hole; after repeating this cycle multiple times, when the flange 4 rotates back to the loading station, the drilling and tapping of all four screw holes will be completed. Compared with the prior art, the flange high-efficiency tapping equipment of the present invention has both drilling and tapping functions, eliminating the need for pre-drilling the bottom hole on other machine tools, thereby avoiding secondary positioning errors caused by cross-equipment transfer; in addition, the rotating station can automatically rotate the flange indexing as the turntable 2 rotates, eliminating the need for manual repeated loosening of the clamp to rotate the flange indexing, effectively improving processing efficiency.

[0025] Reference Figure 2The rotating fixture 3 is equipped with an internal support mechanism, which automatically supports the flange 4 placed on the rotating fixture 3. The internal support mechanism includes a support rod 81, a sleeve 82, an internal support spring, a connecting rod 83, and a support plate 84. The support rod 81 coaxially passes through the rotating fixture 3, serving as both a component of the internal support mechanism and the rotational center axis of the rotating fixture 3. The sleeve 82 is fixedly mounted on the bottom of the turntable 2 and sleeved around the lower end of the support rod 81. The internal support spring connects the support rod 81 and the sleeve 82, providing automatic tensioning force. The support plate 84 is horizontally slidably mounted on the rotating fixture 3. Two support plates 84 are provided, and rubber pads 85 are provided on the outer surfaces of both support plates 84. The rubber pads 85 are used to prevent the support plates 84 from making rigid contact with the flange 4. The inner side of the support plate 84 is connected to the support rod 81 via the connecting rod 83. The support rod 81 and the connecting rod 83 are connected by a connecting ring 86 coaxially rotatably mounted on the support rod 81. In this invention, the connecting ring 86 is a damping ring, such as a bushing-type silicone rubber damping ring, thereby providing a certain rotational damping for the rotating fixture 3, preventing the rotating fixture 3 from easily rotating during clutch disengagement, and ensuring that the rotating fixture 3 rotates only under the control of the intermittent transmission mechanism. Furthermore, in this embodiment, the connection point between the connecting rod 83 and the support rod 81 is higher than the connection point between the connecting rod 83 and the support plate 84. Based on the aforementioned internal support mechanism, the two support plates 84 of the internal support mechanism can automatically tighten the flange 4 installed on the rotating fixture 3 under the action of the internal support spring. The process of installing the flange 4 on the rotating fixture 3 is as follows: first, pull up the support rod 81, and while stretching the internal support spring, the two support plates 84 contract with each other so that the flange 4 can be sleeved between the two support plates 84. Then, release the support rod 81, and the support plate 84 and the rubber pad 85 on its outer side will automatically tighten the flange 4 under the reset action of the internal support spring, thus completing the initial positioning of the flange 4. Similarly, when unloading the flange 4 after the bolt hole processing is completed, simply pull up the support rod 81 to facilitate the unloading and loading of the flange 4.

[0026] Reference Figure 1 In order to provide sufficient space for workers or automatic loading and unloading devices to load and unload flange parts 4, a loading and unloading station is provided on one side of the frame 1. In this embodiment, the loading and unloading station occupies the space of three rotating fixtures 3.

[0027] Reference Figure 2An internal support adjustment assembly is provided between the frame 1 and the internal support mechanism. The internal support adjustment assembly includes an adjustment rod 91 and an abutment member 92. The adjustment rod 91 is fixedly connected to the lower end of the support rod 81 in the horizontal direction, so that the adjustment rod 91 and the support rod 81 move vertically synchronously. The sleeve 82 is provided with a clearance groove for the adjustment rod 91 to pass through, so as to avoid the vertical movement of the adjustment rod 91. The abutment 92 is vertically limited and set on the frame 1. The abutment 92 is located below the drill bit 54 or tap 55. The side of the abutment 92 facing the rotation direction of the adjusting rod 91 is provided with an abutment slope. The abutment slope is used to guide the adjusting rod 91 to move downward after abutting. Therefore, when the rotating fixture 3 moves with the turntable 2 to the drilling position or tapping position, the adjusting rod 91 abuts with the abutment 92 and the adjusting rod 91 drives the support rod 81 to move downward in the vertical direction in sync after abutting, so as to increase the tensioning force of the inner support adjusting component. The purpose is that when the flange 4 reaches the drilling position or tapping position with the rotating fixture 3, the inner support mechanism will automatically increase the tensioning force on the flange 4 under the adjustment action of the inner support adjusting component, and automatically complete the secondary positioning to improve the stability of the flange 4 during drilling or tapping.

[0028] Furthermore, the abutment 92 located below the drill bit 54 is the first abutment, and the abutment 92 located below the tap 55 is the second abutment. In this embodiment, the height of the first abutment is slightly higher than the height of the second abutment, so that the adjustment stroke of the adjusting rod 91 after abutting with the first abutment is slightly less than the adjustment stroke after abutting with the second abutment. This results in the clamping force of the flange 4 at the drilling station being less than the clamping force at the tapping station. The drilling station uses a relatively small internal clamping force, which facilitates the flange to generate a small, controllable resonance. This not only helps to buffer the cutting impact of the drill bit 54 and reduce the chipping damage of the drill bit 54, but also improves chip removal in the bottom hole. The tapping station uses a relatively large internal clamping force, which fully compresses the rubber pad 85, completely and rigidly fixes the flange 4, eliminates processing vibration, and ensures the accuracy of thread processing. Finally, the internal clamping force is adaptively adjusted in stages during the drilling and tapping processes, taking into account both drilling cutting optimization and high-precision thread forming.

[0029] Reference Figure 2The abutment 92 is horizontally slidably mounted on the frame 1 via the sliding rod 93. A return spring is also connected to the abutment 92 in the horizontal direction, controlling the horizontal reset of the sliding rod 93. A distance sensor is also installed on the frame 1 in the sliding direction of the sliding rod 93. The distance sensor is signal-connected to the drilling and tapping device 5. When the rotating fixture 3 moves with the turntable 2 to the drilling or tapping position, the adjusting rod 91 abuts against the sliding rod 93, and the sliding rod 93 slides horizontally after abutting. The distance sensor determines whether the rotating fixture 3 is in position by monitoring the amount of sliding of the sliding rod 93, thus ensuring that the flange 4 reaches the drilling or tapping position before the drilling and tapping device 5 is activated. Furthermore, the bottom of the sliding rod 93, the return spring, and the distance sensor are all housed in a mounting box 94, which provides protection for these components.

[0030] Reference Figure 2 and Figure 3 The rotating fixture 3 has four machining clearance holes 31 extending vertically through it. These four clearance holes 31 are evenly distributed around the axis of the rotating fixture 3. The clearance holes 31 are used to avoid the machining of the drill bit 54 and the tap 55, so that the drill bit 54 and the tap 55 will not damage the rotating fixture 3 after passing through the flange 4. The turntable 2 has a fixture slot to accommodate the rotating fixture 3. The bottom of the fixture slot is in contact with the bottom surface of the rotating fixture 3. The fixture slot has a chip removal hole extending vertically through the turntable 2. The upper end of the chip removal hole is movably aligned with the multiple machining clearance holes 31. That is, as the rotating fixture 3 rotates, the machining clearance holes 31 of the rotating fixture 3 will rotate and pass through the chip removal hole in sequence, thereby pushing the chips that fall into the machining clearance holes 31 during the machining process into the chip removal hole in sequence. Furthermore, a receiving cylinder 21 is connected to the lower end of the chip discharge hole, and a cylinder cover 22 is movably provided at the bottom of the receiving cylinder 21, so that the chips falling into the chip discharge hole are finally collected in the receiving cylinder 21, reducing the accumulation of chips on the equipment. Moreover, the chips can be transferred by opening the cylinder cover 22 at the loading and unloading stations, which facilitates the collection and recycling of processing chips.

[0031] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-efficiency tapping device for flanges, characterized in that: The device includes a frame, a turntable, multiple rotating fixtures, and multiple drilling and tapping devices. The turntable is horizontally rotatably mounted on the frame and connected to a rotation drive assembly. The multiple rotating fixtures are mounted on the turntable around its axis, and the multiple drilling and tapping devices are mounted on the frame around the turntable's axis. Each drilling and tapping device is equipped with drill bits and taps located above the same position of two adjacent rotating fixtures and distributed around the turntable's rotation direction. A centrifugal clutch mechanism is provided between the rotating tool and the turntable, and the centrifugal clutch mechanism separates as the turntable rotates; An intermittent transmission mechanism is provided between the rotating tooling and the frame. The intermittent transmission mechanism includes multiple first meshing parts and second meshing parts. The multiple first meshing parts are respectively disposed on multiple rotating tooling parts, and the multiple second meshing parts are respectively disposed between two adjacent drilling and tapping devices. The intermittent transmission mechanism engages and drives the rotating tooling to rotate at an angle of 360° / N as the rotating disk rotates, where N is the number of bolt holes in the flange and the number of drilling and tapping devices is equal to the number of bolt holes in the flange.

2. The high-efficiency tapping equipment for flanges according to claim 1, characterized in that: The centrifugal clutch mechanism includes a centrifugal pin and multiple pin holes. The centrifugal pin is elastically connected to the turntable, and the multiple pin holes are evenly arranged circumferentially on the rotating fixture. The number of pin holes on the rotating fixture is equal to the number of screw holes on the flange. The centrifugal pin is inserted into one of the pin holes, and the centrifugal pin overcomes the elastic force and disengages from the pin hole as the turntable rotates.

3. The high-efficiency tapping equipment for flanges according to claim 1, characterized in that: The intermittent transmission mechanism includes a gear ring and a rack. The gear ring is coaxially fixedly sleeved on the rotating tooling, and the rack is fixedly mounted on the frame. The gear ring intermittently meshes with the rack as the turntable rotates.

4. The high-efficiency tapping equipment for flanges according to claim 1, characterized in that: The rotating fixture is equipped with an internal support mechanism for automatically supporting the flange placed on the rotating fixture. The internal support mechanism includes a support rod, a sleeve, an internal support spring, a connecting rod, and a support plate. The support rod coaxially passes through the rotating fixture. The sleeve is fixedly disposed at the bottom of the turntable and sleeved onto the lower end of the support rod. The internal support spring is connected between the support rod and the sleeve. The support plate is slidably disposed on the rotating fixture. At least two support plates are provided. The outer side of the support plate is provided with a rubber pad. The inner side of the support plate is connected to the support rod through the connecting rod. The support rod and the connecting rod are connected by a connecting ring coaxially rotatably disposed on the support rod.

5. The high-efficiency tapping equipment for flanges according to claim 4, characterized in that: The connecting ring is a damping ring, which restricts the rotating tooling to rotate only under the action of the intermittent transmission mechanism.

6. The high-efficiency tapping equipment for flanges according to claim 4, characterized in that: An internal support adjustment assembly is provided between the frame and the internal support mechanism. The internal support adjustment assembly includes an adjustment rod and an abutment. The adjustment rod is horizontally connected to the lower end of the support rod. The sleeve has a clearance groove for the adjustment rod to pass through. The abutment is vertically limited and disposed on the frame. The abutment is located below the drill bit or tap. When the rotating fixture moves with the turntable to the drilling or tapping position, the adjustment rod abuts against the abutment and moves vertically after abutting, thereby increasing the tension of the internal support adjustment assembly.

7. The high-efficiency tapping equipment for flanges according to claim 6, characterized in that: The abutment located below the drill bit is the first abutment, and the abutment located below the tap is the second abutment. The adjustment stroke of the adjusting rod after it abuts the first abutment is less than the adjustment stroke after it abuts the second abutment.

8. The high-efficiency tapping equipment for flanges according to claim 6, characterized in that: The abutment is horizontally slidably mounted on the frame via a sliding rod. A return spring is connected to the abutment in the horizontal direction. A distance sensor is also provided on the frame in the sliding direction of the sliding rod. When the rotating fixture moves with the turntable to the drilling or tapping position, the adjusting rod abuts against the sliding rod, and the sliding rod slides horizontally after abutting. The distance sensor determines whether the rotating fixture is in position by monitoring the amount of sliding of the sliding rod.

9. The high-efficiency tapping equipment for flanges according to claim 1, characterized in that: The rotating fixture has multiple machining clearance holes extending vertically through it, and these holes are evenly distributed around the axis of the rotating fixture. The number of machining clearance holes is equal to the number of bolt holes on the flange. The turntable has a fixture slot for accommodating the rotating fixture, the bottom of which is flush with the bottom surface of the rotating fixture. The fixture slot also has a chip removal hole extending vertically through the turntable. The upper end of the chip removal hole is movably aligned with the multiple machining clearance holes, and the lower end of the chip removal hole is connected to a receiving cylinder. A cylinder cover is movably installed at the bottom of the receiving cylinder.

10. A tapping control method for a high-efficiency tapping device for flanges as described in any one of claims 1-9, characterized in that: The flange to be processed is first placed on the rotating fixture. The flange passes through multiple drilling and tapping devices sequentially as the turntable revolves intermittently. Upon passing each device, the flange is first drilled at the drilling station below the drill bit, and then tapped at the tapping station below the tap, completing the machining of one threaded hole. The flange then enters the next drilling and tapping device as the turntable revolves intermittently. During this revolving process, based on the separation of the centrifugal clutch mechanism and the meshing transmission of the intermittent transmission mechanism, the rotating fixture will synchronously rotate, completing the rotational indexing of the flange. The next threaded hole is then machined on the next drilling and tapping device. This process is repeated multiple times. When the flange rotates back to the loading / unloading station, multiple threaded holes have been drilled and tapped.

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