Valve body tapping machine

Abstract

The application discloses a valve body tapping machine, and relates to the technical field of valve machining machines, which comprises a machine tool body, a main shaft tapping device acting on the machine tool body, a rest plate, a planetary gear driving mechanism, a polygon frame expansion mechanism arranged on the side wall of the rest plate from top to bottom, a magnetic fluid tapping head assembly arranged on each transmission frame, and a plurality of universal transmission telescopic shafts connected with the output end of the planetary gear driving mechanism. The polygon frame expansion mechanism is arranged, the shape change of the polygon frame expansion mechanism is controlled by using a driving link assembly, the same planetary gear driving mechanism provides power through the universal transmission telescopic shaft, the main shaft head does not need to be replaced or additional adjustment tools, the self-adapting capacity of the equipment to different specifications of valve bodies and different hole position distributions is greatly improved, and the tapping process of a plurality of valve body types can be covered by one machine tool.

Description

Technical Field

[0001] This invention relates to the field of valve processing machinery technology, specifically a valve body tapping machine tool. Background Technology

[0002] As a core component of fluid control equipment, the quality of the threaded holes on the valve body directly affects the valve's sealing performance and assembly reliability. During valve body manufacturing, the tapping process is a crucial precision machining step. Common valve body structures include flange connection holes, valve cover bolt holes, multi-channel interface holes, and mounting holes on irregular curved surfaces. These holes are distributed in various ways on the valve body. Currently, valve body tapping mainly employs the following methods, which also have the following drawbacks. Firstly, using a radial drilling machine or vertical drilling machine with a single-axis tapping head to tap holes one by one is inefficient and can easily introduce positional errors due to multiple positioning steps. Second, a special combination tapping machine tool is used, but the hole position distribution of the multi-spindle head is fixed, which can only be applied to valve bodies of specific models and specific hole system distributions. When the valve body specifications change or the hole position distribution changes, the entire set of multi-spindle heads needs to be replaced or even the machine tool needs to be readjusted, resulting in poor equipment versatility. In summary, there is an urgent need to provide a valve body tapping machine tool with a variable tapping head array arrangement. Summary of the Invention

[0003] The purpose of this invention is to provide a valve body tapping machine tool. By setting up a polygonal frame expansion mechanism and using a drive linkage assembly to control its shape change, the same planetary gear drive mechanism provides power through a universal transmission telescopic shaft. Without the need to replace the spindle head or make additional tooling adjustments, the machine tool's adaptability to different valve body specifications and different hole distributions is greatly improved, allowing one machine tool to cover the tapping process of multiple valve body types.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a valve body tapping machine tool, comprising: a machine tool body, and a spindle tapping device acting on the machine tool body; the spindle tapping device includes a backing plate, a planetary gear drive mechanism and a polygonal frame expansion mechanism mounted on the side wall of the backing plate and arranged sequentially from top to bottom, wherein the polygonal frame expansion mechanism includes several transmission frames and a drive linkage assembly connecting two adjacent transmission frames, and each transmission frame is equipped with a magnetic fluid tapping head assembly, and several universal transmission telescopic shafts connected to the output end of the planetary gear drive mechanism; each universal transmission telescopic shaft is connected to each magnetic fluid tapping head assembly. The components are connected in a one-to-one correspondence and transmission connection. When the drive linkage assembly is running synchronously, the polygonal frame expansion mechanism gradually expands from a polygonal contraction state to a curved state and then to a straight state, so as to drive the transformation of several magnetic fluid tapping head assemblies into ring, curved and linear arrays. When several magnetic fluid tapping head assemblies are distributed in a ring array, they can be used for tapping annular holes on valve bodies. When several magnetic fluid tapping head assemblies are in a curved or linear array, they can be used for tapping single holes, multiple holes or multiple valve bodies. The machine tool body is also equipped with a bidirectional moving platform, which can move horizontally in X and Y directions to adapt to the working mode of several magnetic fluid tapping head assemblies in different arrays.

[0005] Preferably, each set of transmission frames includes an upper support frame, which is an isosceles trapezoid with mounting slots at its four corners, and a first support ring mounted on the upper support frame. The first support ring has a plurality of hydraulic cylinders distributed in a ring, and each hydraulic cylinder passes through a through hole in the first support ring and is connected to an actuating telescopic rod at its actuating end. A lower support frame is connected to the bottom of the plurality of actuating telescopic rods, and a second support ring is mounted on the lower support frame. Each magnetic fluid tapping head assembly is correspondingly mounted on the second support ring.

[0006] Preferably, the drive linkage assembly includes several end blocks. The two ends of each end block are rotatably connected to the mounting slots on the bottom corners of two adjacent upper support frames via first pins. An electric telescopic rod is connected to the middle of each end block via a second connecting end. A first connecting end is provided at the output end of the electric telescopic rod. The first connecting end is connected to connecting rods via second pins on both sides. The ends of the two connecting rods away from the first connecting end are rotatably connected to the mounting slots on the top corners of two adjacent upper support frames via third pins.

[0007] Preferably, the planetary gear drive mechanism includes a mounting bracket fixed to the back plate, a servo motor fixedly mounted on the top of the mounting bracket, an output shaft of the mounting bracket passing through a through hole on the mounting bracket and fixedly connected to a central wheel; and a mounting ring fixed to the lower surface of the mounting bracket, on which a plurality of rotatable planetary gears are distributed in a ring, and an external gear ring mounted on the bottom of the mounting bracket and rotatable, wherein each planetary gear meshes with the central wheel and the external gear ring for transmission.

[0008] Preferably, each of the universal transmission telescopic shafts includes a first free telescopic rod, and a first ball joint and a second ball joint disposed at both ends of each first free telescopic rod. Each first ball joint is correspondingly assembled at the bottom of each planetary gear, and a first rotating shaft is assembled at the bottom of each second ball joint. The first rotating shaft is rotatably mounted to a second support ring on the upper support frame, and a second free telescopic rod is fixedly connected to the bottom of the first rotating shaft. Each of the magnetic fluid tapping head assemblies is correspondingly connected to the bottom of each second free telescopic rod.

[0009] Preferably, the magnetorheological tapping head assembly includes an inner shaft and an outer sleeve arranged sequentially from the inside to the outside. The outer sleeve is rotatably mounted to the inner shaft via upper and lower fixed end caps and a sealing sleeve. The top of the inner shaft is fixed to the middle of the sealing sleeve and has a plurality of first blades distributed in a ring around its outer periphery. The outer sleeve is rotatably mounted on a second support ring and has a plurality of second blades that are adapted to the first blades distributed in a ring on its inner wall. An annular gap is formed between the outer sleeve and the inner shaft for filling with magnetorheological material. A magnetic field generating device is fixedly assembled on each second support ring and sleeved on the outer periphery of the outer sleeve. The magnetorheological material is in a liquid or low-viscosity state when there is no external magnetic field. When a magnetic field is applied, the magnetic particles suspended inside it will arrange themselves along the direction of the magnetic field to form a chain structure, causing the material to transform into a near-solid or high-viscosity state within milliseconds. This process is completely reversible. The bottom of the outer sleeve passes through a through hole in the second support ring and extends to an extension sleeve, and a tapping drill bit is matched with the extension sleeve.

[0010] Preferably, the number of tapping drill bits is eight, and they are of two types and distributed at intervals. Each tapping drill bit includes a drill body and a stepped portion disposed on the top of the drill body. The stepped portion is provided with a bolt assembly that mates with the extension sleeve.

[0011] Preferably, the inner shaft passes through a through hole in the sealing sleeve and is connected to a heat-conducting conductive rod, as well as a conductive groove located in the middle of the drill body and adapted to the conductive rod. One end of the conductive rod is placed in the conductive groove and extends to the head of the drill body. Furthermore, each magnetic fluid tapping head assembly has a microgroove circumferentially formed on the outer wall of the outer sleeve, and an optical fiber ring embedded in the microgroove. The optical fiber ring is sequentially provided with a first Bragg grating and a second Bragg grating. The first Bragg grating is attached to the flange connecting the outer sleeve and the second support ring and is used to measure tangential strain to reflect torque changes. The second Bragg grating is located on the outer sleeve and close to the annular gap area formed between it and the inner shaft and is used to measure the working temperature.

[0012] Preferably, the machine tool body includes a base frame, a machine platform located on top of the base frame and placed horizontally, and a control box located on the machine platform. The control box is equipped with a control panel and a horizontal plate connected between the back plate and the control box.

[0013] Preferably, the bidirectional moving platform includes a slide rail mounted on the machine base, a slidable transmission seat mounted on the slide rail, and a first screw mounted on one side of the slide rail and rotatably mounted on the machine base. The first screw has a first helical transmission groove on its outer periphery that is threadedly connected to the transmission seat, and its end away from the control box passes through the machine base and is connected to a first crank handle. The transmission seat is also equipped with a long frame that is perpendicular to the slide rail. A base is slidably mounted on the first screw, and a clamping seat is mounted on the top of the base for clamping the valve body. A rotatable second screw is also provided inside the first screw. The second screw has a second helical transmission groove that is threadedly connected to the base, and the end of the second screw away from the cross plate passes through the long frame and is connected to a second crank handle.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention, by setting up a polygonal frame expansion mechanism and using a drive linkage assembly to control its shape change, enables several magnetohydrodynamic tapping head assemblies to flexibly switch between ring arrays, curved arrays, and linear arrays. This design is simple and reliable. The transformation process is powered by the same planetary gear drive mechanism through a universal transmission telescopic shaft, eliminating the need to replace the spindle head or make additional tooling adjustments. This greatly improves the equipment's adaptability to different valve body specifications and different hole distributions, allowing a single machine tool to cover tapping processes for multiple valve body types. This significantly expands the equipment's processing range, and the synchronous multi-axis tapping method can improve processing efficiency several times over. Attached Figure Description

[0015] Figure 1 This is a first-view three-dimensional structural diagram of the present invention; Figure 2 for Figure 1 A second-view 3D structural diagram; Figure 3 for Figure 1 A schematic diagram of the side view structure; Figure 4 for Figure 1 A front view structural diagram; Figure 5 for Figure 4 A schematic diagram of the internal structure cut along section AA; Figure 6 for Figure 5 A partially enlarged structural diagram; Figure 7 This is a partial disassembly diagram of the spindle tapping device of the present invention; Figure 8 for Figure 7 A second-view 3D structural diagram; Figure 9 for Figure 8 A partially enlarged structural diagram; Figure 10 for Figure 9 A front view structural diagram; Figure 11 for Figure 9 A schematic diagram of the internal structure cut along the CC axis; Figure 12 for Figure 11 A magnified structural diagram at point B; Figure 13 This is a partially enlarged structural diagram of the polygonal frame expansion mechanism of the present invention; Figure 14 This is a partial disassembly diagram of the polygonal frame expansion mechanism of the present invention; Figure 15 for Figure 13 A second-view 3D structural diagram; Figure 16 for Figure 14 A second-view 3D structural diagram.

[0016] In the diagram: 111. Base frame; 112. Machine base; 113. Control box; 114. Horizontal plate; 115. Control panel 212. Slide rail; 213. First screw; 214. First crank handle; 311. Transmission seat; 312. Long frame; 313. Second screw; 314. Second crank handle; 315. Base; 316. Clamping seat; 411. Drill body; 4111. Conducting groove; 4112. Step section; 4113. Bolt assembly; 511. Upper support frame; 5111. First support ring; 5112. Hydraulic cylinder; 512. End block; 513. Electric telescopic rod; 514. First connecting end; 515. Connecting rod; 5113. Actuating telescopic rod; 5114. Lower support frame; 5115. Second support ring; 516. Second connecting end; 5116. Magnetic field generating device; 5118. Mounting slot; 611. First free telescopic rod; 612. First ball joint; 613. Second ball joint; 616. Second free telescopic rod; 617. End cap; 618. First pivot; 711. Backplate; 712. Servo motor; 713. Mounting bracket; 714. External gear ring; 715. Mounting ring; 716. Planetary gear; 717. Center gear; 811, Inner shaft; 8111, Sealing sleeve; 814, Outer sleeve; 813, First blade; 8141, Extension sleeve; 815, Conducting rod; 816, Second blade. Detailed Implementation

[0017] In the description of this invention, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention. The various embodiments of this invention are described in detail below with reference to the accompanying drawings.

[0018] Example 1

[0019] Please see Figures 1 to 16The present invention preferably provides the following technical solution: a valve body tapping machine tool, comprising: a machine tool body, and a spindle tapping device acting on the machine tool body; the spindle tapping device includes a backing plate 711, a planetary gear drive mechanism and a polygonal frame expansion mechanism arranged sequentially from top to bottom on the side wall of the backing plate 711, wherein the polygonal frame expansion mechanism includes several transmission frames and a drive linkage assembly connecting two adjacent transmission frames, and each transmission frame is equipped with a magnetic fluid tapping head assembly, and several universal transmission telescopic shafts connected to the output end of the planetary gear drive mechanism: each universal transmission telescopic shaft is paired with each magnetic fluid tapping head assembly. The transmission connection should be made simultaneously; when the drive linkage assembly runs synchronously, the polygonal frame expansion mechanism gradually expands from a polygonal contraction state to a curved state and then to a straight state, so as to drive the transformation of several magnetic fluid tapping head assemblies into ring, curved and linear arrays. When several magnetic fluid tapping head assemblies are distributed in a ring array, they can be used for tapping annular holes on valve bodies. When several magnetic fluid tapping head assemblies are in a curved or linear array, they can be used for tapping single holes, multiple holes or multiple valve bodies. The machine tool body is also equipped with a bidirectional moving platform, which can move horizontally in X and Y directions to adapt to the working mode of several magnetic fluid tapping head assemblies in different arrays.

[0020] In this embodiment, such as Figure 1 , 2 As shown in Figure 3, by setting up a polygonal frame expansion mechanism and using a drive linkage assembly to control its shape change, several magnetohydrodynamic tapping head assemblies can flexibly switch between annular arrays, curved arrays, and linear arrays. The annular array is suitable for synchronous tapping of multiple holes in annular distribution on valve bodies, such as flange holes and valve cover bolt holes. The curved array can be adapted to the machining of hole systems on irregular curved surface valve bodies. The linear array is suitable for tapping single holes, multiple holes, or linear arrangements of multiple valve bodies. This allows a single machine tool to cover tapping processes for various valve body types, significantly expanding the processing range of the equipment. Moreover, the synchronous multi-axis tapping method can improve processing efficiency by several times. Secondly, the polygonal frame expansion mechanism is based on the linkage design of the transmission frame and the drive linkage assembly, which can achieve a smooth transition from the shrinking state to the bending state and then to the straight state. The mechanical structure is simple and reliable. The transformation process is powered by the same planetary gear drive mechanism through the universal transmission telescopic shaft. There is no need to replace the main shaft head or make additional adjustments to the tooling, which greatly improves the equipment's adaptability to valve bodies of different specifications and different hole distributions. Furthermore, each tapping head assembly employs magnetohydrodynamic tapping technology, which can effectively reduce vibration and cutting resistance during the tapping process and reduce the risk of tap breakage.

[0021] Finally, the bidirectional moving platform can move along the X and Y horizontal directions, and can automatically adjust the position of the worktable according to the current array shape of the tapping head, so as to achieve precise positioning and automatic processing in conjunction with the CNC system; In summary, the polygonal frame expansion mechanism designed in this paper can complete the tapping of different hole systems in a single clamping operation through shape transformation, reducing auxiliary time and lowering the labor intensity of operators.

[0022] Furthermore, each transmission frame includes an upper support frame 511, which has an isosceles trapezoidal structure and mounting slots 5118 at its four corners, and a first support ring 5111 mounted on the upper support frame 511. Several hydraulic cylinders 5112 are distributed in a ring on the first support ring 5111, and each hydraulic cylinder 5112 passes through a through hole in the first support ring 5111 and is connected to an actuating telescopic rod 5113 at its actuating end. A lower support frame 5114 is connected to the bottom of the several actuating telescopic rods 5113, and a second support ring 5115 is mounted on the lower support frame 5114. Each magnetic fluid tapping head assembly is correspondingly mounted on the second support ring 5115.

[0023] like Figure 9 , 10 As shown in Figures 13, 14, 15, and 16, the transmission frame, with its isosceles trapezoidal structure for the upper support frame 511, features mounting slots 5118 at its four corners for hinged connections with adjacent frames and linkage mechanisms. This trapezoidal design effectively reduces the gap between frames while ensuring frame strength, resulting in a smaller space occupied by the polygonal frame expansion mechanism in its contracted state. This facilitates the arrangement of more tapping units within the limited working space of the machine tool. The transmission frame itself employs a connection layout of upper and lower support frames 511 and lower support frame 5114. When the hydraulic cylinder 5112 at the corresponding position is controlled, the lower support frame 5114 at the corresponding position descends, providing an independent lifting and lowering driving force for tapping.

[0024] Furthermore, the drive linkage assembly includes several end blocks 512. The two ends of each end block 512 are rotatably connected to the mounting grooves 5118 on the bottom corners of two adjacent upper support frames 511 respectively via first pins. Each end block 512 is connected to an electric telescopic rod 513 via a second connecting end 516 in the middle, and a first connecting end 514 is provided at the output end of the electric telescopic rod 513. The first connecting end 514 is connected to connecting rods 515 on both sides via second pins. The ends of the two connecting rods 515 away from the first connecting end 514 are rotatably connected to the mounting grooves 5118 on the top corners of two adjacent upper support frames 511 respectively via third pins.

[0025] like Figure 13 , 14As shown in Figure 15, the drive linkage assembly includes an end block 512, a second connecting end 516, an electric telescopic rod 513, a first connecting end 514, and connecting rods 515 on both sides. The electric telescopic rod 513 drives the first connecting end 514 to move, and the power is transmitted to the top corner of the adjacent transmission frame via the connecting rods 515. Simultaneously, the end block 512 connects to the bottom corner, forming multi-point linkage. This achieves a smooth transition from a condensed state to a bent state and then to a straight state. Furthermore, the magnetic fluid tapping head assembly is fixed to the frame via the lower support frame 5114 and the second support ring 5115, resulting in a short force transmission path, high overall rigidity, and ensuring stability during multi-axis synchronous tapping. Secondly, each upper support frame 511 integrates a hydraulic cylinder 5112, a first support ring 5111, and a lower support frame 5114 and a second support ring 5115. The magnetic fluid tapping head assembly can be independently assembled on the second support ring 5115. The output of the planetary gear drive mechanism directly drives each magnetic fluid tapping head assembly through the universal transmission telescopic shaft. The shape transformation of the frame is completed by the drive linkage assembly, and the two do not interfere with each other. For complex layouts such as flange annular holes, multiple rows of straight holes, and irregular curved holes commonly found on valve bodies, this structure can be clamped once, quickly transformed, and tapped synchronously, greatly improving the process flexibility of the equipment.

[0026] Example 2

[0027] In another embodiment of the present invention, the planetary gear drive mechanism includes a mounting bracket 713 fixed on a back plate 711, a servo motor 712 fixedly mounted on the top of the mounting bracket 713, an output shaft of the mounting bracket 713 passing through a through hole on the mounting bracket 713 and fixedly connected to a central wheel 717; and a mounting ring 715 fixed on the lower surface of the mounting bracket 713, a plurality of rotatable planetary gears 716 being distributed in a ring on the mounting ring 715, and an external gear ring 714 mounted on the bottom of the mounting bracket 713 and rotatable, each planetary gear 716 meshing with the central wheel 717 and the external gear ring 714 for transmission.

[0028] Furthermore, each universal telescopic shaft includes a first free telescopic rod 611, and a first ball joint 612 and a second ball joint 613 located at both ends of each first free telescopic rod 611. Each first ball joint 612 is correspondingly mounted on the bottom of each planetary gear 716, and each second ball joint 613 is equipped with a first rotating shaft 618 at its bottom. The first rotating shaft 618 is rotatably mounted to the second support ring 5115 on the upper support frame 511, and a second free telescopic rod 616 is fixedly connected to the bottom of the first rotating shaft 618. Each magnetic fluid tapping head assembly is correspondingly connected to the bottom of each second free telescopic rod 616.

[0029] In this embodiment, such as Figure 7 , 8As shown in Figure 9, the planetary gear drive mechanism includes a central gear 717, planetary gears 716, and an external gear ring 714. A single-input servo motor 712 can achieve synchronous, same-speed, or proportional speed output for multiple planetary gears 716. Each planetary gear is independently connected to a universal joint telescopic shaft at its bottom, thereby driving the corresponding magnetic fluid tapping head assembly. This structure ensures that during multi-axis tapping, each tapping head obtains almost identical speed and torque, significantly improving the thread consistency of multi-hole synchronous tapping and avoiding problems caused by speed differences. Secondly, each universal joint telescopic shaft includes a first free telescopic rod 611 and a first ball joint 612 and a second ball joint 613 at both ends, and the first free telescopic rod 611 itself has a telescopic function. This structure can adapt to the aforementioned polygonal frame expansion mechanism, that is, the change in angle between adjacent transmission frames during the shape transformation is compensated by the universal joint, and the change in distance between the frames is compensated by the telescopic extension of the first free telescopic rod 611 itself. In summary, through the universal joint telescopic shaft, regardless of whether the magnetohydrodynamic tapping head assembly is in a ring, curved or linear array, the universal joint telescopic shaft can efficiently and smoothly transmit the power of the planetary gear mechanism to each tapping head, avoiding interference or additional loads caused by the displacement of the rigid shaft.

[0030] Example 3

[0031] In another embodiment of the present invention, the magnetohydrodynamic tapping head assembly includes an inner shaft 811 and an outer sleeve 814 arranged sequentially from the inside to the outside. The outer sleeve 814 is rotatably mounted to the inner shaft 814 via upper and lower fixed end caps 617 and a sealing rotating sleeve 8111. The top of the inner shaft 811 is fixed to the middle of the sealing rotating sleeve 8111, and a plurality of first blades 813 are distributed in a ring around its outer periphery. The outer sleeve 814 is rotatably mounted on a second support ring 5115, and a plurality of second blades 816 adapted to the first blades 813 are distributed in a ring on its inner wall. The outer sleeve 814 and the inner shaft 811 form a... The annular gap is used to fill the magnetorheological material, and a magnetic field generating device 5116 is fixedly mounted on each second support ring 5115 and sleeved on the outer periphery of the outer sleeve 814. The magnetorheological material is in a liquid or low viscosity state when there is no external magnetic field. When a magnetic field is applied, the magnetic particles suspended inside it will arrange themselves along the direction of the magnetic field to form a chain structure, causing the material to transform into a near-solid or high viscosity state within milliseconds. This process is completely reversible. The bottom of the outer sleeve 814 has a through hole in the second support ring 5115 and an extension sleeve 8141 extending therefrom, as well as a tapping drill bit assembled with the extension sleeve 8141.

[0032] In this embodiment, a magnetohydrodynamic tapping head assembly is further provided. Firstly, the magnetic field generating device 5116 is a mature existing technology, and will not be elaborated upon here. Figure 6 , 7As shown in Figures 8, 9, 11, and 12, the magnetorheological material is filled in the annular gap between the inner shaft 811 and the outer sleeve 814 through the magnetorheological tapping head assembly. Since the tapping drill bit is mounted on the extension sleeve 8141, and due to the properties of the magnetorheological material—a mature technology that is widely used—when a magnetic field is applied, the magnetorheological material transforms into a near-solid or high-viscosity state within milliseconds. The outer sleeve 814 is static relative to the inner shaft 811, and they rotate together as a single unit, driving the drill bit to rotate and tap. When no external magnetic field is applied, the magnetorheological material is in a low-viscosity liquid state, and the outer sleeve 814 can rotate freely relative to the inner shaft 811. The tapping drill bit has a torque buffer, providing overload protection. That is, during the tapping process, if a drill bit encounters abnormally large resistance, such as material hardening, chip blockage, or an undersized bottom hole, the magnetic field can be removed or reduced when the temperature is too high to buffer it, thereby cutting off or reducing torque transmission, protecting the tap and the workpiece from damage, and significantly extending its lifespan.

[0033] Furthermore, there are eight tapping drill bits in two groups and they are spaced apart. Each tapping drill bit includes a drill body 411 and a step portion 4112 provided on the top of the drill body 411. The step portion 4112 is provided with a bolt assembly 4113 that is assembled with the extension sleeve 8141.

[0034] like Figure 3 , 7 As shown in Figure 9, eight tapping drill bits are used, arranged in two groups at intervals. The hydraulic cylinders 5112 at the corresponding positions are driven, causing the four telescopic rods 5113 at the corresponding positions to descend. This causes the four identical annular tapping drill bits to rise and fall simultaneously and drive the tapping drill bits to rotate, thus completing the simultaneous machining of the common flange annular holes on the valve body.

[0035] Example 4

[0036] In another embodiment of the present invention, the inner shaft 811 passes through the through hole of the sealing sleeve 8111 and is connected to a heat-conducting conductive rod 815, and a conductive groove 4111 is opened in the middle of the drill body 411 and adapted to the conductive rod 815. One end of the conductive rod 815 is placed in the conductive groove 4111 and extends to the head of the drill body 411. Microgrooves are opened circumferentially on the outer wall of the outer sleeve 814 of each magnetic fluid tapping head assembly, and an optical fiber ring is embedded in the microgrooves. A first Bragg grating and a first Bragg grating are sequentially arranged on the optical fiber ring. The first Bragg grating is attached to the flange connecting the outer jacket 814 and the second support ring 5115 to measure tangential strain to reflect torque changes. The second Bragg grating is placed on the outer jacket 814 and close to the annular gap area formed by it and the inner shaft 811 to measure the operating temperature. The fiber ring is led out from the rotating tapping head to the stationary grating demodulator through a rotating fiber coupler or a slip ring optical connector to avoid tangling. The sensing fibers of all tapping heads can be connected to the same multi-channel grating demodulator to realize independent monitoring and control of each tapping head.

[0037] In this embodiment, the Bragg grating is a mature existing technology. Its core working principle is Bragg reflection: a periodic refractive index modulation grating period Λ is etched within the fiber core using an ultraviolet laser to form a miniature narrowband reflection filter. When broadband light is incident, only wavelengths that satisfy the Bragg condition are strongly reflected due to constructive interference caused by phase matching, while the remaining wavelengths are transmitted. The reflected Bragg wavelength is determined by the formula λ_B = 2n_eff·Λ, where n_eff is the effective refractive index of the fiber core. Its sensing mechanism is based on changes in environmental physical quantities such as strain and temperature, which alter n_eff or Λ, causing a shift in λ_B. A preset safe temperature threshold and a strain warning threshold are used to generate two sets of triggering methods: When the temperature monitored by the second Bragg grating reaches the safe temperature threshold setting, the control system controls the magnetic field generator 5116 to linearly reduce the magnetic field strength applied to the magnetorheological material, thereby reducing the transmission torque and reducing the generation of cutting heat. When the tangential strain measured by the first Bragg grating reaches the strain warning threshold, the control system controls the magnetic field generator 5116 to immediately cut off the magnetic field or reduce it to zero, the magnetorheological material becomes liquid, the outer sleeve 814 can rotate freely relative to the inner shaft 811, and the tapping drill bit has a buffer and stops rotating. In summary, temperature and torque signals can achieve dual-condition triggering: protection actions are executed if either exceeds the limit.

[0038] Example 5

[0039] In another embodiment of the present invention, the machine tool body includes a base frame 111, a machine platform 112 disposed on top of the base frame 111 and placed horizontally, and a control box 113 disposed on the machine platform 112. The control box 113 is equipped with a control panel 115 and a horizontal plate 114 connected between the back plate 711 and the control box 113 and arranged horizontally. The bidirectional moving platform includes a slide rail 212 disposed on the machine platform 112, a slidable transmission seat 311 mounted on the slide rail 212, and a first screw 213 disposed on one side of the slide rail 212 and rotatably mounted on the machine platform 112. The outer periphery of the first screw 213 is threaded to the transmission seat 311. The first spiral drive groove is connected, and its end away from the control box 113 passes through the machine base 112 and is connected to the first rocker 214; the transmission base 311 is also equipped with a long frame 312 that is perpendicular to the slide rail 212; a base 315 is slidably installed on the first screw 213, and a clamping seat 316 is assembled on the top of the base 315 for clamping the valve body; and a rotatable second screw 313 is also provided inside the first screw 213. The second screw 313 is provided with a second spiral drive groove that is threadedly connected to the base 315, and the end of the second screw 313 away from the horizontal plate 114 passes through the long frame 312 and is connected to the second rocker 314.

[0040] In this embodiment, to address the positional changes of the magnetohydrodynamic tapping head assembly in Embodiment 1 between the annular array, the curved array, and the linear array, a bidirectional moving platform is further provided, such as... Figure 1 and 2 As shown, the X-axis moving component includes a slide rail 212, a transmission seat 311, a first screw 213, and a first rocker arm 214, while the Y-axis moving component includes a long frame 312, a base 315, a second screw 313, and a second rocker arm 314. In the X-axis direction, rotating the first screw 213 drives the transmission seat 311 to slide along the slide rail 212, and rotating the second screw 313 drives the base 315 to slide along the long frame 312. The two axes adopt independent helical transmission mechanisms, driven by their respective first rocker arm 214 and second rocker arm 314, respectively. They do not interfere with each other and can achieve independent movement in the X and Y directions. The stroke range is larger and can adapt to the position matching requirements of the tapping head assembly in different array configurations.

[0041] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Detachable installation can take many forms, such as through a combination of plug-in and snap-fit ​​connections, or through bolted connections, etc.

[0042] The above embodiments, which describe the specific features of the present invention, are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-essential improvements and adjustments made to the present invention by those skilled in the art based on the above description of the invention shall fall within the scope of protection of the present invention.

Claims

1. A valve body tapping machine, characterized in that, include: Machine tool body, and the spindle tapping device acting on the machine tool body; The main spindle tapping device includes a backing plate (711), a planetary gear drive mechanism and a polygonal frame expansion mechanism arranged sequentially from top to bottom on the side wall of the backing plate (711), wherein the polygonal frame expansion mechanism includes several transmission frames and a drive linkage assembly connecting two adjacent transmission frames, and each transmission frame is equipped with a magnetohydrodynamic tapping head assembly and several universal transmission telescopic shafts connected to the output end of the planetary gear drive mechanism. Each of the universal telescopic shafts corresponds to and is connected to each magnetic fluid tapping head assembly. When the drive linkage assembly is running synchronously, the polygonal frame expansion mechanism gradually expands from a polygonal contraction state to a curved state and then to a straight state, so as to drive the magnetic fluid tapping head assemblies to change into a ring, curved and linear array. When the magnetic fluid tapping head assemblies are distributed in a ring array, they can be used for tapping annular holes on valve bodies. When the magnetic fluid tapping head assemblies are in a curved or linear array, they can be used for tapping single holes, multiple holes or multiple valve bodies. The machine tool body is also equipped with a bidirectional moving platform, which can move horizontally in both X and Y directions to adapt to the working modes of different arrays of several magnetohydrodynamic tapping head assemblies.

2. A valve body tapping machine according to claim 1, wherein: Each transmission frame includes an upper support frame (511), which is an isosceles trapezoid with mounting slots (5118) at its four corners, and a first support ring (5111) mounted on the upper support frame (5111). Several hydraulic cylinders (5112) are distributed in a ring on the first support ring (5111), and each hydraulic cylinder (5112) passes through a through hole in the first support ring (5111) and is connected to an actuating telescopic rod (5113) at its actuating end. A lower support frame (5114) is connected to the bottom of the several actuating telescopic rods (5113), and a second support ring (5115) is mounted on the lower support frame (5114). Each magnetic fluid tapping head assembly is correspondingly mounted on the second support ring (5115).

3. The valve body tapping machine of claim 1, wherein: The drive linkage assembly includes several end blocks (512). The two ends of each end block (512) are rotatably connected to the mounting grooves (5118) on the bottom corners of two adjacent upper support frames (511) via first pins. Each end block (512) is connected to an electric telescopic rod (513) via a second connecting end (516) in the middle. A first connecting end (514) is provided at the output end of the electric telescopic rod (513). The first connecting end (514) is connected to connecting rods (515) via second pins on both sides. The ends of the two connecting rods (515) away from the first connecting end (514) are rotatably connected to the mounting grooves (5118) on the top corners of two adjacent upper support frames (511) via third pins.

4. The valve body tapping machine of claim 1, wherein: The planetary gear drive mechanism includes a mounting bracket (713) fixed on a back plate (711), a servo motor (712) fixedly mounted on the top of the mounting bracket (713), the output shaft of the mounting bracket (713) passing through a through hole on the mounting bracket (713) and fixedly connected to a center wheel (717); and a mounting ring (715) fixed on the lower surface of the mounting bracket (713), a plurality of rotatable planetary gears (716) are distributed in a ring on the mounting ring (715), and an external gear ring (714) mounted on the bottom of the mounting bracket (713) and rotatable, each of the planetary gears (716) meshing with the center wheel (717) and the external gear ring (714) for transmission.

5. The valve body tapping machine of claim 1, wherein: Each of the universal telescopic shafts includes a first free telescopic rod (611), and a first ball joint (612) and a second ball joint (613) located at both ends of each first free telescopic rod (611). Each first ball joint (612) is correspondingly assembled at the bottom of each planetary gear (716), and each second ball joint (613) is equipped with a first rotating shaft (618) at its bottom. The first rotating shaft (618) is rotatably mounted to a second support ring (5115) on the upper support frame (511), and a second free telescopic rod (616) is fixedly connected to the bottom of the first rotating shaft (618). Each of the magnetic fluid tapping head assemblies is correspondingly connected to the bottom of each second free telescopic rod (616).

6. The valve body tapping machine of claim 1, wherein: The magnetic fluid tapping head assembly includes an inner shaft (811) and an outer sleeve (814) arranged sequentially from the inside to the outside. The outer sleeve (814) is rotatably mounted to the inner shaft (814) via upper and lower fixed end caps (617) and a sealing rotating sleeve (8111). The top of the inner shaft (811) is fixed to the middle of the sealing rotating sleeve (8111), and several first blades (813) are distributed in a ring around its outer periphery. The outer sleeve (814) is rotatably mounted on a second support ring (5115), and several second blades (816) adapted to the first blades (813) are distributed in a ring on its inner wall. The outer sleeve (814) and the inner shaft (811) are rotatably mounted to the inner shaft (811). 1) An annular gap is formed between them to fill the magnetorheological material, and a magnetic field generating device (5116) is fixedly assembled on each second support ring (5115) and sleeved on the outer periphery of the outer sleeve (814). The magnetorheological material is in a liquid or low viscosity state when there is no external magnetic field. When a magnetic field is applied, the magnetic particles suspended inside it will be arranged along the direction of the magnetic field to form a chain structure, causing the material to transform into a near-solid or high viscosity state within milliseconds. This process is completely reversible. The bottom of the outer sleeve (814) passes through the through hole on the second support ring (5115) and extends with an extension sleeve (8141), as well as a tapping drill bit assembled with the extension sleeve (8141).

7. A valve body tapping machine according to claim 6 wherein: The number of tapping drill bits is eight, and they are in two groups and are spaced apart. Each tapping drill bit includes a drill body (411) and a step portion (4112) provided on the top of the drill body (411). The step portion (4112) is provided with a bolt assembly (4113) that is assembled with the extension sleeve (8141).

8. A valve body tapping machine according to claim 6 wherein: The inner shaft (811) passes through the through hole of the sealing rotating sleeve (8111) and is connected to a heat-conducting rod (815), and a transmission groove (4111) is opened in the middle of the drill body (411) and adapted to the transmission rod (815). One end of the transmission rod (815) is placed in the transmission groove (4111) and extends to the head of the drill body (411). Furthermore, a microgroove is provided along the circumferential direction on the outer wall of the outer sleeve (814) of each magnetic fluid tapping head assembly, and an optical fiber ring is embedded in the microgroove. A first Bragg grating and a second Bragg grating are sequentially arranged on the optical fiber ring. The first Bragg grating is attached to the flange connecting the outer sleeve (814) and the second support ring (5115) to measure tangential strain to reflect torque changes. The second Bragg grating is located on the outer sleeve (814) and close to the annular gap area formed by it and the inner shaft (811) to measure the working temperature.

9. The valve body tapping machine of claim 1, wherein: The machine tool body includes a base frame (111), a machine platform (112) located on top of the base frame (111) and placed horizontally, and a control box (113) located on the machine platform (112). The control box (113) is equipped with a control panel (115) and a horizontal plate (114) connected between the back plate (711) and the control box (113) and arranged horizontally.

10. The valve body tapping machine of claim 1, wherein: The bidirectional mobile platform includes a slide rail (212) on the machine base (112), a slidable transmission seat (311) is installed on the slide rail (212), and a first screw (213) is provided on one side of the slide rail (212) and rotatably installed on the machine base (112). The outer periphery of the first screw (213) is provided with a first spiral transmission groove that is threadedly connected to the transmission seat (311), and one end of the screw (213) away from the control box (113) passes through the machine base (112) and is connected to a first rocker arm (214). The transmission base (311) is also equipped with a long frame (312) that is perpendicular to the slide rail (212). A base (315) is slidably mounted on the first screw (213), and a clamping seat (316) is mounted on the top of the base (315) for clamping the valve body. A rotatable second screw (313) is also provided inside the first screw (213). A second spiral transmission groove is opened on the second screw (313) that is threaded to the base (315). The end of the second screw (313) away from the horizontal plate (114) passes through the long frame (312) and is connected to a second rocker handle (314).

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