A screw pump stator processing device and method

Abstract

The present invention relates to the field of processing of screw pump stators, and specifically to a screw pump stator processing device and method, including a processing table, a CNC milling machine is arranged on the left side of the processing table, the CNC milling machine is composed of a feeding mechanism and a spindle unit, and a fixing unit for fixing a tubular blank is arranged on the upper end of the processing table. The present invention uses the clamping components evenly arranged on the left and right to not only uniformly clamp and support long-sized tubular blanks at multiple points, but also can perform multi-point clamping and end limit on short-sized tubular blanks through cooperation with the limiting components. Whether it is a long or short-sized tubular blank, it can be stably and reliably clamped and accurately and stably processed, with high applicability, ensuring the stability of tubular blanks of different lengths during processing, and effectively preventing the tubular blanks from offsetting and affecting the quality of their spiral inner cavity forming.

Description

Technical Field

[0001] The invention relates to the field of processing of screw pump stators, and in particular to a processing device and method for a screw pump stator. Background Art

[0002] The screw pump is a positive displacement pump, which is mainly used to process and transport various types of fluids. It is widely used in the chemical industry, food processing, construction processing and other fields. The stator is a key component of the screw pump. It has a spiral inner cavity to accommodate the screw (i.e., the rotor). When the screw rotates, the sealed cavity formed between the stator and the screw will move along the axial direction, thereby achieving effective suction, sealing and discharge of the liquid. The stator is usually made of elastic material, but under high temperature, high pressure and certain extreme chemical conditions (such as mineral processing or marine engineering, etc.), a metal stator (such as stainless steel) is required. The milling cutter is controlled by a CNC milling machine to mill the inner cavity of the metal tubular blank to obtain a stator with a spiral inner cavity.

[0003] However, the following problems still exist in the process of milling grooves on the inner cavity of tubular blanks: 1. A three-jaw chuck is commonly used to clamp and fix a single end of the tubular blank. This clamping method is difficult to ensure that the tubular blank is always in a balanced and stable state. During the processing, the tubular blank is prone to shaking or axial movement, which affects the processing and forming quality of the spiral inner cavity.

[0004] 2. When processing the inner cavity of a long tubular blank, it is difficult to completely process the inner cavity at one time. At this time, the tubular blank needs to be disassembled and the processing direction needs to be changed. The need to disassemble back and forth increases the processing time, and the overall processing efficiency needs to be improved. At the same time, the above problems exist before and after the replacement of the tubular blank.

[0005] Therefore, in order to solve the problems existing in the groove milling process of the inner cavity of the tubular blank, the present invention provides a screw pump stator processing device. Summary of the invention

[0006] The present invention provides a screw pump stator processing equipment, comprising a processing table, a CNC milling machine is arranged on the left side of the processing table, the CNC milling machine is composed of a feeding mechanism and a spindle unit, a fixing unit for fixing a tubular blank is arranged on the upper end of the processing table; the fixing unit comprises a rectangular plate rotatably mounted on the upper end of the processing table, a fixing plate is symmetrically mounted on the upper end of the rectangular plate, a positioning component for centering the tubular blank is arranged between the upper ends of the front and rear fixing plates, three groups of clamping components evenly arranged left and right are arranged between the front and rear fixing plates, the clamping component comprises a bottom plate, the bottom plate in the middle is fixedly mounted between the front and rear fixing plates, the other bottom plates are all slidably mounted between the front and rear fixing plates left and right, and the bottom plate A sliding groove is provided in the middle of the plate, in which two front and rear symmetrical clamping plates are slidably installed, and a control plate that slides through the sliding groove is installed on the side away from the front and rear clamping plates. A control component for driving the corresponding front and rear control plates to move synchronously and oppositely along the sliding groove is provided under the bottom plate, a limiting component for limiting the end of the tubular blank is provided at the right end of the bottom plate on the right side, and a driving component for driving the fixing unit to rotate is provided on the processing table; a linkage component is provided between the clamping components on the left and right sides, and the spindle unit includes a milling cutter arranged at the right end of the feed mechanism, and a pushing component for pushing the clamping component on the left side to move right is provided on the front and rear sides of the milling cutter.

[0007] In one possible implementation, an arc-shaped groove is provided in the middle of the upper end of the middle base plate, and two left and right areas symmetrically located about the sliding groove on the upper end of the middle base plate are provided with two strip grooves arranged front and back, a fixed column is installed between the front and rear inner walls of the strip groove, a triangular baffle plate is slidably installed on the fixed column and is connected to the corresponding strip groove for front and rear sliding, the inclined surfaces of the corresponding front and rear triangular baffles are arranged opposite to each other, and a connecting spring mounted on the outside of the fixed column is connected between the inner wall of the strip groove and the corresponding triangular baffle.

[0008] In one possible implementation, the alignment component includes an inverted shaped frame installed between the upper ends of two front and rear fixed plates, a square column is provided at the lower end of the horizontal section of the inverted shaped frame, the square column is fixedly mounted in the middle of the fixed section of the two-way electric telescopic rod, alignment plates are installed at the lower ends of the left and right telescopic ends of the two-way electric telescopic rod, vertical plates that slide up and down and penetrate the horizontal section of the inverted shaped frame are installed on the front and rear sides of the square column, a push plate is installed between the upper ends of the front and rear vertical plates, a vertical guide rail located on the left side of the push plate is installed at the upper end of the horizontal section of the inverted shaped frame, and an electric slider fixedly connected to the push plate is slidably installed on the vertical guide rail.

[0009] In one possible implementation, a longitudinal plate is provided at the lower middle portion of the square column, a limit block is installed at the lower end of the longitudinal plate, a triangular slot is provided at the lower end of the limit block and cooperates with the front and rear clamping plates in the clamping assembly in the middle, a slide plate that slides through the horizontal section of the inverted frame is installed on the front and rear sides of the upper end of the longitudinal plate, a mating gear that is rotatably installed at the lower end of the horizontal section of the inverted frame is provided between the slide plate and the corresponding vertical plate, vertical racks that mesh with the mating gears are installed on the opposite sides of the slide plate and the adjacent mating gears, an avoidance groove for avoiding the vertical rack is provided on the horizontal section of the inverted frame, and a square plate is installed on the upper end of the slide plate.

[0010] In one possible implementation, the limiting assembly includes a side panel installed at the right end of the bottom plate on the right side, the upper end of the side panel is provided with square holes evenly arranged front to back, two arc-shaped plates symmetrically distributed front to back are arranged on the right side of the side panel, evenly arranged support rods are installed on the inner side of the arc-shaped plate, and a square rod plugged into the corresponding square hole is installed on the left end of the arc-shaped plate.

[0011] In one possible implementation, the control component includes a connecting rod hinged at the lower ends of the corresponding front and rear control plates, the middle parts of the front and rear connecting rods are cross-hinged, and a moving block is hinged at the end of the connecting rod away from the control plate. The front and rear moving blocks are slidably installed on the upper end of the same connecting plate, and the lower end of the connecting plate is connected to the pushing end of the electric push rod. All the electric push rods are jointly installed on the upper end of the strip plate that is slidably connected to the rectangular plate left and right. The driving component includes a rotating gear installed at the lower end of the rectangular plate and rotatably connected to the processing table. A driving gear is meshed on the front side of the rotating gear, and the lower end of the driving gear is connected to the output shaft of the motor that rotates through the processing table, and the motor is installed at the lower end of the processing table through a support.

[0012] In one possible implementation, the pushing assembly includes two push columns installed at the right end of the feed mechanism and symmetrically distributed about the front and rear of the milling cutter, a fixed block is installed at the right end of the push column, an automatic slider is slidably arranged at the right end of the fixed block, a T-block is installed at the right end of the automatic slider, and the distance between the T-block and the left clamping assembly is greater than the distance between the right end face of the milling cutter and the left clamping assembly.

[0013] In one possible implementation, the linkage assembly is located between the front and rear vertical sections of the inverted frame, and the linkage assembly includes a sliding block, and the front and rear areas of the upper ends of the bottom plates on the left and right sides are both installed with sliding blocks that are slidably connected to the corresponding fixed plates left and right, and the sides of the two opposite sliding blocks on the left and right sides are installed with T-slot plates that cooperate with the T-blocks, and the sliding blocks are provided with transverse racks that are slidably connected to the corresponding fixed plates left and right. The transverse racks corresponding to the left and right opposite sliding blocks are distributed front and back, and an adjusting gear that is rotatably connected to the corresponding fixed plates is meshed between the two transverse racks, and connecting columns that are slidably connected to the connecting plates up and down and slide through the corresponding sliding blocks are installed on the front and rear sides of the upper ends of the strip plates on the left and right sides, and movable through grooves that are slidably connected to the corresponding connecting columns left and right are provided on the fixed plates on the front and rear sides.

[0014] In one possible implementation, the sliding block on the left is fixedly connected to its corresponding transverse rack, and a connecting block is installed on the transverse rack corresponding to the sliding block on the right, and an adjustable telescopic rod is rotatably installed on the upper end of the connecting block, and a support plate is installed on the upper end of the telescopic end of the adjustable telescopic rod, and a sleeve matching the upper end of the corresponding connecting column is installed on the lower end of the support plate close to the corresponding sliding block, an auxiliary plate is installed on the right end of the connecting block, and an auxiliary rod matching the sleeve is installed on the upper end of the auxiliary plate, and two left and right sockets are provided at the upper ends of the front and rear fixed plates corresponding to the right side of the middle clamping assembly, and the sliding block on the right side is plugged into and matched with the corresponding sockets through the plug rod.

[0015] In a possible implementation, an extension plate located below the milling cutter is provided at the right end of the feed mechanism, a support plate is installed at the upper right end of the extension plate, and rollers evenly arranged on the left and right are rotatably installed on the upper end of the support plate.

[0016] In addition, the present invention also provides a method for processing a screw pump stator, which specifically includes the following steps: S1, centering: For long-sized tubular blanks, the tubular blank to be processed can be placed horizontally and laterally between three groups of clamping components evenly arranged on the left and right, and then the left and right ends of the tubular blank are aligned and centered through the alignment components. For short-sized tubular blanks, the clamping component on the right can be moved to the clamping component close to the middle, and then the tubular blank to be processed can be placed horizontally and left-aligned between the three groups of clamping components.

[0017] S2. Clamping and fixing: Whether it is a long-sized tubular blank or a short-sized tubular blank, the tubular blank can be clamped by the clamping assembly in the same way. For the long-sized tubular blank, the clamping force of the middle clamping assembly can be made greater than the clamping force of the right-side clamping assembly, and the clamping force of the right-side clamping assembly is greater than the clamping force of the left-side clamping assembly. After the fixation is completed, the positioning assembly needs to be moved away from the tubular blank. For the short-sized tubular blank, the middle and right-side clamping assemblies both firmly clamp the tubular blank, while the left-side clamping assembly remains in a relaxed state. At the same time, the right end of the tubular blank needs to be limited by the limiting assembly.

[0018] S3. Milling: The milling cutter is moved to the right to process the inner cavity of the tubular blank through the cooperation between the feed mechanism and the spindle unit. For long-sized tubular blanks, the pushing component can drive the clamping components and the control components on the left and right sides to move synchronously toward each other through the linkage component to complete the processing of the spiral inner cavity of the left half of the tubular blank. For short-sized tubular blanks, the pushing component can drive the clamping component and the control component on the left to move to the right through the linkage component, and the milling cutter can complete the processing of the spiral inner cavity of the short-sized tubular blank at one time.

[0019] S4. Rotating the tubular blank: For a long tubular blank, the rotation degree of the fixing unit and the tubular blank as a whole can be controlled by a rotating assembly, and then the unprocessed inner cavity portion of the tubular blank can be processed in the same manner.

[0020] S5. Release the fixation: No matter it is a long-sized tubular blank or a short-sized tubular blank, after the spiral inner cavity of the tubular blank is formed, it is necessary to reset the spindle unit and the milling cutter, and reset the clamping assembly at the same time, and then control the clamping assembly through the control assembly to release the clamping fixation of the tubular blank, and finally the tubular blank after processing and forming can be removed.

[0021] The beneficial effects of the present invention are as follows: 1. The present invention uses the clamping components evenly arranged on the left and right to not only perform uniform multi-point clamping and support on long-sized tubular blanks, but also perform multi-point clamping and end limiting on short-sized tubular blanks through cooperation with the limiting components. Whether it is a long or short-sized tubular blank, it can be stably and reliably clamped and accurately and stably processed. It has high applicability, ensures the stability of tubular blanks of different lengths during processing, and effectively prevents the tubular blank from being offset and affecting the quality of its spiral inner cavity forming.

[0022] 2. When processing the inner cavity of a long tubular blank, the present invention can use a driving assembly to drive the fixing unit and the tubular blank to rotate as a whole, and flexibly change the processing direction of the tubular blank by rotating the tubular blank in a fixed state, thereby facilitating the processing of the spiral inner cavity from both ends of the long tubular blank, which is beneficial to the smooth forming of the spiral inner cavity of the tubular blank, and can ensure the stability of the tubular blank during the conversion of the processing direction, so that the left and right parts of the inner cavity of the tubular blank can be processed equally accurately and consistently, avoiding the disassembly and replacement of the tubular blank back and forth, and helping to improve the overall processing efficiency.

[0023] 3. When the inner cavity of a long tubular blank is processed by the present invention, the clamping assemblies on the left and right sides can move in opposite directions synchronously with the movement of the milling cutter, and the clamping force of the clamping assembly opposite to the milling cutter can be adjusted to be greater than the clamping force of the clamping assembly on the other side. The axial force generated by the clamping assembly with a larger clamping force during the movement can offset the axial force generated by the milling cutter when processing the inner cavity of the tubular blank to a certain extent; when the inner cavity of a short tubular blank is processed, the limit assembly can be used to offset the axial force generated during the processing of the tubular blank. By reducing the axial force on the tubular blank, the axial movement of the tubular blank can be effectively avoided, the stability of the tubular blank in the axial direction can be improved, and the processing and forming effect and quality of the spiral inner cavity of the tubular blank can be ensured.

[0024] In addition to the technical problems solved by the embodiments of the present invention described above, the technical features that constitute the technical solutions, and the beneficial effects brought about by the technical features of these technical solutions, other technical problems that can be solved by a screw pump stator processing equipment and method provided by the embodiments of the present application, other technical features included in the technical solutions, and the beneficial effects brought about by these technical features will be further described in detail in the specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0026] Figure 2 It is a schematic diagram of the three-dimensional structure of the alignment component of the present invention.

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure of the fixing unit of the present invention.

[0028] Figure 4 It is a three-dimensional structural schematic diagram of the connecting block, the adjusting telescopic rod and the sleeve of the present invention.

[0029] Figure 5 It is a schematic diagram of the three-dimensional structure of the control component of the present invention.

[0030] Figure 6It is a three-dimensional structural schematic diagram of the clamping assembly and the control assembly located in the middle of the present invention.

[0031] Figure 7 It is a schematic diagram of the three-dimensional structure of the clamping assembly and the limiting assembly located on the right side of the present invention.

[0032] Figure 8 It is a schematic diagram of the three-dimensional structure of the driving assembly of the present invention.

[0033] Fig. 9 It is a schematic diagram of the three-dimensional structure of the pushing assembly of the present invention.

[0034] Fig.10 It is a process flow chart of the present invention.

[0035] In the figure: 1, processing table; 11, rotating gear; 12, driving gear; 13, motor; 2, feeding mechanism; 3, spindle unit; 31, milling cutter; 32, push column; 321, fixed block; 322, T-block; 323, extension plate; 324, support plate; 4, fixed unit; 41, rectangular plate; 42, fixed plate; 421, bottom plate; 422, sliding groove; 423, clamping plate; 424, control plate; 425, strip groove; 426, triangular baffle; 427, connecting spring; 43, inverted frame; 431, two-way electric telescopic rod; 432, alignment plate; 433, vertical plate; 434, vertical guide rail; 435 , electric slider; 436, longitudinal plate; 437, limit block; 438, slide plate; 439, matching gear; 440, vertical rack; 441, connecting rod; 442, moving block; 443, connecting plate; 444, electric push rod; 445, strip plate; 451, sliding block; 452, T-slot plate; 453, transverse rack; 454, adjusting gear; 455, connecting column; 456, moving through slot; 461, connecting block; 462, adjusting telescopic rod; 463, supporting plate; 464, sleeve; 465, auxiliary rod; 466, jack; 467, side plate; 468, square hole; 469, arc plate; 470, push rod. DETAILED DESCRIPTION

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described below, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0037] See also Figure 1A screw pump stator processing equipment includes a processing table 1, a CNC milling machine is arranged on the left side of the processing table 1, and the CNC milling machine is composed of a feeding mechanism 2 and a spindle unit 3. A fixing unit 4 for fixing a tubular blank is arranged on the upper end of the processing table 1.

[0038] See also Figure 1 and Figure 2 The fixing unit 4 includes a rectangular plate 41 rotatably mounted on the upper end of the processing table 1, and a fixing plate 42 is symmetrically mounted on the upper end of the rectangular plate 41. A positioning component for centering the tubular blank is arranged between the upper ends of the front and rear fixing plates 42, and the positioning component includes an inverted frame 43 installed between the upper ends of the front and rear fixing plates 42, and a square column is arranged at the lower end of the horizontal section of the inverted frame 43, and the square column is fixedly sleeved in the middle part of the fixed section of the two-way electric telescopic rod 431, and the lower ends of the left and right telescopic ends of the two-way electric telescopic rod 431 are both installed with positioning plates 432, and the front and rear sides of the square column are both installed with vertical plates 433 that slide up and down and penetrate the horizontal section of the inverted frame 43, and a push plate is installed between the upper ends of the front and rear vertical plates 433, and a vertical guide rail 434 located on the left side of the push plate is installed on the upper end of the horizontal section of the inverted frame 43, and an electric slider 435 fixedly connected to the push plate is slidably installed on the vertical guide rail 434.

[0039] See also Figure 3 , Figure 5 , Figure 6 and Figure 7 Three groups of clamping components evenly arranged left and right are arranged between the front and rear fixed plates 42, and the clamping components include a bottom plate 421, the bottom plate 421 located in the middle is fixedly installed between the front and rear fixed plates 42, and the other bottom plates 421 are slidably installed left and right between the front and rear fixed plates 42, a sliding groove 422 is opened in the middle of the bottom plate 421, and two front and rear symmetrical clamping plates 423 are slidably installed in the sliding groove 422, and a control plate 424 that slides through the sliding groove 422 is installed on the side away from the front and rear clamping plates 423. An arc-shaped groove is provided in the middle of the upper end of the plate 421, and two left and right areas symmetrically arranged about the sliding groove 422 on the upper end of the middle bottom plate 421 are provided with two strip grooves 425 arranged front to back, and a fixing column is installed between the front and rear inner walls of the strip groove 425, and a triangular baffle plate 426 is slidably installed on the fixing column and is slidably connected to the corresponding strip groove 425 for front and rear sliding, and the inclined surfaces of the corresponding front and rear triangular baffle plates 426 are arranged opposite to each other, and a connecting spring 427 mounted on the outside of the fixing column is connected between the inner wall of the strip groove 425 and the corresponding triangular baffle plate 426.

[0040] In the initial state, the three groups of clamping components are evenly distributed on the left and right. When a long tubular blank needs to be processed, the tubular blank to be processed needs to be placed horizontally on the upper end of the base plate 421 evenly arranged on the left and right. The base plate 421 evenly arranged on the left and right can provide an evenly distributed supporting force for the bottom of the tubular blank. In the process of placing the tubular blank on the upper end of the middle base plate 421, the tubular blank can squeeze the inclined surfaces of different triangular baffles 426 at the same time by its own gravity, so that the front and rear relative triangular baffles 426 move synchronously in opposite directions along the corresponding fixed columns and strip grooves 425 and compress the connecting spring 427. Under the action of the connecting spring 427, the triangular baffle 426 elastically presses the tubular blank to keep it in the front and back center state. In addition, the arc-shaped groove can fit in contact with the outer annular surface of the tubular blank, which can further ensure the accuracy of the centering of the tubular blank and the stability of the subsequent fixing of the tubular blank.

[0041] Next, the electric slider 435 can drive the push plate to move downward along the vertical guide rail 434, and the push plate drives the vertical plates 433 on the front and rear sides to move downward synchronously along the horizontal section of the inverted frame 43, and the square column drives the two-way electric telescopic rod 431 and the alignment plate 432 to move downward synchronously, so that the alignment plate 432 is located between the two front and rear fixed plates 42. Since the tubular blank has maintained a horizontal center state front and back, the tubular blank is just located between the left and right alignment plates 432 at this time. Subsequently, the two-way electric telescopic rod 431 can drive the left and right alignment plates 432 to move toward each other synchronously until they collide with the corresponding ends of the tubular blank. In this process, the left and right alignment plates 432 can drive the tubular blank to move left and right along the bottom plate 421 arranged left and right, so that the tubular blank is in a left and right centered state.

[0042] See also Figure 1 , Figure 3 , Figure 5 , Figure 6 and Figure 8 A control component for driving the corresponding front and rear control plates 424 to move synchronously and oppositely along the sliding groove 422 is provided below the bottom plate 421, and the control component includes connecting rods 441 hinged at the lower ends of the corresponding front and rear control plates 424, and the middle parts of the front and rear connecting rods 441 are cross-hinged, and a moving block 442 is hinged at one end of the connecting rod 441 away from the control plate 424, and the front and rear moving blocks 442 are slidably installed on the upper end of the same connecting plate 443, and the lower end of the connecting plate 443 is connected to the pushing end of the electric push rod 444, and all the electric push rods 444 are jointly installed on the upper end of the strip plate 445 connected to the rectangular plate 41 for left and right sliding.

[0043] See also Figure 1 and Figure 2A longitudinal plate 436 is provided at the lower middle part of the square column, and a limit block 437 is installed at the lower end of the longitudinal plate 436. A triangular slot cooperating with the front and rear clamping plates 423 in the clamping assembly located in the middle is provided at the lower end of the limit block 437. A slide plate 438 sliding through the horizontal section of the inverted frame 43 is installed on the front and rear sides of the upper end of the longitudinal plate 436. A matching gear 439 rotatably installed at the lower end of the horizontal section of the inverted frame 43 is provided between the slide plate 438 and the corresponding vertical plate 433. A vertical rack 440 meshing with the matching gear 439 is installed on the opposite side of the slide plate 438 and the adjacent matching gear 439. An avoidance slide groove for avoiding the vertical rack 440 is provided on the horizontal section of the inverted frame 43, and a square plate is installed on the upper end of the slide plate 438.

[0044] After the tubular blank is centered, the electric push rod 444 can drive the corresponding connecting plate 443 to move downward at the same time, and the connecting plate 443 drives the corresponding front and rear moving blocks 442 to move toward each other synchronously. The front and rear connecting rods 441 rotate toward each other as the corresponding moving blocks 442 move, and the connecting rod 441 drives the corresponding control plate 424 and the clamping plate 423 to move synchronously through the sliding groove 422 toward the direction close to the tubular blank until the two front and rear clamping plates 423 clamp the tubular blank at the same time, and the three groups of clamping assemblies arranged on the left and right are respectively clamped and fixed on the end and the middle of the tubular blank. , which is beneficial to improving the stability of the tubular blank and ensuring that the tubular blank can be processed accurately and effectively in the future. The force with which the clamping assembly clamps the tubular blank can be controlled by the push-pull force of the electric push rod 444. At this time, the clamping force of the middle clamping assembly can be greater than the clamping force of the right clamping assembly, and the clamping force of the right clamping assembly is greater than the clamping force of the left clamping assembly, ensuring that the middle clamping assembly can firmly clamp the middle part of the tubular blank, while the clamping assembly on the left is in a relaxed state but can support and limit the tubular blank, and the clamping assembly on the right is in a state of clamping the tubular blank with a certain force.

[0045] After the tubular blank is fixed, the electric slider 435 can be used to drive the push plate, the vertical plate 433, the square column, the bidirectional electric telescopic rod 431 and the alignment plate 432 to move up synchronously away from the tubular blank along the vertical guide rail, so that the alignment plate 432 is away from the processing surface of the end of the tubular blank to carry out subsequent processing. When the vertical plate 433 moves up, it drives the corresponding vertical rack 440 to move synchronously. Under the action of the vertical rack 440 and the corresponding matching gear 439, the slide plate 438 can be synchronously moved along the inverted frame 43 with the corresponding vertical rack 440 The horizontal section and the avoidance slide groove move downward, and the slide plates 438 on the front and rear sides drive the longitudinal plate 436 and the limit block 437 to move downward synchronously until the triangular grooves at the lower end of the limit block 437 simultaneously press against the upper ends of the front and rear clamping plates 423 in the middle clamping assembly, thereby limiting and tightening the clamping plates 423 at this position, which is beneficial to improve the stability of the clamping plates 423 during the clamping process, and thereby improve the reliability of the tubular blank. It should be noted that the limit block 437 in the initial state is away from the clamping assembly and will not interfere with the placement and clamping of the tubular blank.

[0046] See also Figure 1 and Fig. 9 The spindle unit 3 includes a milling cutter 31 arranged at the right end of the feed mechanism 2, and a pushing assembly for pushing the left clamping assembly to move to the right is arranged on the front and rear sides of the milling cutter 31. The pushing assembly includes two push columns 32 installed at the right end of the feed mechanism 2 and symmetrically distributed about the front and rear of the milling cutter 31. A fixed block 321 is installed at the right end of the push column 32, and a T-block 322 is slidably arranged at the right end of the fixed block 321. The distance between the T-block 322 and the left clamping assembly is greater than the distance between the right end face of the milling cutter 31 and the left clamping assembly. An extension plate 323 located below the milling cutter 31 is arranged at the right end of the feed mechanism 2, and a support plate 324 is installed at the upper right end of the extension plate 323. Rollers evenly arranged on the left and right are rotatably installed on the upper end of the support plate 324.

[0047] See also Figure 3 and Figure 5A linkage assembly located between the front and rear vertical sections of the inverted frame 43 is arranged between the clamping assemblies on the left and right sides, and the linkage assembly includes a sliding block 451. The front and rear areas on the upper ends of the bottom plates 421 on the left and right sides are both installed with sliding blocks 451 that are slidably connected to the corresponding fixed plates 42. A T-slot plate 452 that matches the T-block 322 is installed on the side away from the two opposite sliding blocks 451 on the left and right sides. The size of the T-slot of the T-slot plate 452 is larger than the size of the T-block 322. The sliding block 451 is provided with a corresponding fixed The plate 42 is slidably connected to the transverse rack 453, the transverse racks 453 corresponding to the left and right opposite sliding blocks 451 are distributed front and back, and an adjusting gear 454 rotatably connected to the corresponding fixed plate 42 is meshed between the two transverse racks 453, and the front and rear sides of the upper ends of the left and right strip plates 445 are installed with connecting columns 455 that are slidably connected to the connecting plate 443 up and down and slide through the corresponding sliding blocks 451, and the fixed plates 42 on the front and rear sides are provided with movable through grooves 456 that are slidably connected to the corresponding connecting columns 455 left and right.

[0048] See also Figure 1 and Figure 8 The processing table 1 is provided with a driving assembly for driving the fixed unit 4 to rotate. The driving assembly includes a rotating gear 11 installed at the lower end of the rectangular plate 41 and rotatably connected to the processing table 1. A driving gear 12 is meshed with the front side of the rotating gear 11. The lower end of the driving gear 12 is connected to the output shaft of a motor 13 that rotates through the processing table 1. The motor 13 is installed at the lower end of the processing table 1 through a support.

[0049] After the tubular blank is fixed, the spindle unit 3 can be controlled to move rightward by the feed mechanism 2, and the spindle unit 3 drives the milling cutter 31 to rotate quickly and gradually approach the processing surface of the left end of the tubular blank. In this process, the push column 32 drives the fixed block 321 and the T-block 322 to move rightward synchronously, and the extension plate 323 drives the support plate 324 to move rightward synchronously. While the milling cutter 31 continues to move rightward, the milling groove processing can be started from the left end of the tubular blank. After the milling cutter 31 moves rightward to process a small section of the tubular blank, the fixed block 321 moves rightward to the top of the corresponding fixed plate 42, and the T-block 322 is located above the corresponding T-slot plate 452 as a whole. At this time, the T-block 322 is moved downward to cooperate with the T-slot plate 452 through an external driving source (such as an electric slider). Because the size of the T-slot of the T-slot plate 452 is larger than the size of the T-block 322, During the rightward movement, the T-block 322 moves downward and can also cooperate with the T-slot plate 452; as the feeding mechanism 2 and the milling cutter 31 continue to move rightward, the pushing assembly can push the front and rear sliding blocks 451 on the left side to move rightward along the corresponding fixed plate 42 synchronously through the cooperation of the T-block 322 and the T-slot plate 452. During this process, since the clamping assembly on the left side is in a relaxed state, the bottom plate 421 on the left side can move rightward synchronously with the corresponding sliding block 451, and the sliding block 451 can drive the connecting column 455 to move rightward synchronously along the corresponding moving through groove 456, and the connecting column 455 drives the connecting plate 443 and the strip plate 445 to move rightward synchronously along the rectangular plate 41, so that the control assembly and the clamping assembly on the left side move rightward synchronously as a whole, and the clamping assembly during the rightward movement can always support and limit the tubular blank in the processing process to ensure the stability of the tubular blank.

[0050] At the same time, the sliding block 451 located on the left side can drive the corresponding transverse rack 453 to move synchronously to the right. Under the action of the adjusting gear 454, the sliding block 451 located on the right side is driven by the corresponding transverse rack 453 to move synchronously to the left. At this time, the clamping assembly on the right side and the control assembly move synchronously to the right as a whole. Since the clamping assembly on the right side clamps the right end of the tubular blank, the clamping assembly on the right side can apply a left axial force to the tubular blank while moving left along the tubular blank. The left axial force can offset the right axial force applied to the tubular blank when the milling cutter 31 moves right, thereby reducing the axial movement of the tubular blank caused by the right axial force during processing, thereby improving the stability of the tubular blank in the axial direction.

[0051] In the process of the pushing component pushing the left clamping component and the control component to move right, the extension plate 323 drives the support plate 324 to gradually move right to the lower end of the tubular blank, and while the milling cutter 31 moves right for processing, the support plate 324 rolls in contact with the lower end surface of the tubular blank through rollers, supporting the tubular blank section after the spiral inner cavity is formed. The rollers can reduce the friction between the tubular blank and the support plate 324.

[0052] After the spiral inner cavity of the left half of the tubular blank is formed, the feed mechanism 2 can be used to control the spindle unit 3, the milling cutter 31 and the pushing assembly to move left and reset. The pushing assembly can drive the clamping assemblies and the control assemblies on the left and right sides to move in the opposite direction and reset synchronously through the linkage assembly. After the clamping assemblies and the control assemblies are reset, the T-block 322 can be moved upward to disengage it from the corresponding T-slot plate 452, thereby releasing the association between the pushing assembly and the linkage assembly.

[0053] Then, the driving gear 12 can be driven to rotate by the motor 13, and the driving gear 12 drives the rotating gear 11 and the rectangular plate 41 to rotate synchronously until the rectangular plate 41 drives the fixing unit 4 and the tubular blank to rotate 180 degrees as a whole, so that the unprocessed end of the tubular blank is facing left at this time, and then the clamping force of the clamping assembly located on the left side at this time can be reduced, and the clamping force of the clamping assembly located on the right side at this time can be increased, and then the unprocessed part inside the tubular blank at this time can be milled by the milling cutter 31 in the same manner as above, until the spiral inner cavity inside the tubular blank is completely formed, and the processing direction of the tubular blank can be flexibly changed by rotating the tubular blank in a fixed state, while the internal spiral inner cavity of the tubular blank of a longer size is smoothly formed, the stability of the tubular blank during the conversion process can be guaranteed, and the left and right parts of the inner cavity of the tubular blank can be processed equally accurately and effectively, and there is no need to disassemble and change the processing direction of the tubular blank back and forth, thereby improving the overall processing efficiency.

[0054] See also Figure 3 and Figure 4 The sliding block 451 on the left is fixedly connected to its corresponding transverse rack 453, and a connecting block 461 is installed on the transverse rack 453 corresponding to the sliding block 451 on the right. An adjusting telescopic rod 462 is rotatably installed on the upper end of the connecting block 461, and a supporting plate 463 is installed on the upper end of the telescopic end of the adjusting telescopic rod 462. A sleeve 464 matching the upper end of the corresponding connecting column 455 is installed on the lower end of the supporting plate 463 close to the corresponding sliding block 451. An auxiliary plate is installed on the right end of the connecting block 461, and an auxiliary rod 465 matching the sleeve 464 is installed on the upper end of the auxiliary plate. Two left and right distributed sockets 466 are opened at the upper ends of the front and rear fixed plates 42 corresponding to the right side of the middle clamping assembly. The sliding block 451 on the right is plugged and matched with the corresponding socket 466 through the plug rod.

[0055] See also Figure 3 and Figure 7The right end of the bottom plate 421 located on the right side is provided with a limiting assembly for limiting the end of the tubular blank, and the limiting assembly includes a side plate 467 installed at the right end of the bottom plate 421 located on the right side, and the upper end of the side plate 467 is provided with square holes 468 evenly arranged front and back, and two arc plates 469 symmetrically distributed front and back are provided on the right side of the side plate 467, and evenly arranged support rods 470 are installed on the inner side of the arc plate 469, and a square rod plugged into the corresponding square hole 468 is installed on the left end of the arc plate 469.

[0056] See also Figure 1-Figure 10 When processing a long tubular blank, the sleeve 464 is sleeved on the corresponding connecting column 455, and the transverse rack 453 on the right side can drive the clamping assembly on the right side to move synchronously through the connecting block 461, the adjusting telescopic rod 462, the support plate 463 and the sleeve 464. When processing a short tubular blank, the adjusting telescopic rod 462 can be first stretched to make the support plate 463 drive the sleeve 464 to move upward away from the corresponding connecting column 455, and then the adjusting telescopic rod 462 can be rotated to make the support plate 463 drive the sleeve 464 to move to the corresponding auxiliary rod 465 At the top, the telescopic rod 462 is then retracted and adjusted to allow the sleeve 464 to be sleeved on the auxiliary rod 465. In this way, the connection between the linkage assembly and the clamping assembly on the right side can be released, so that the clamping assembly on the right side is in an independent state. Then, the clamping assembly and the control assembly on the right side can be moved to the left so that the clamping assembly on the right side is close to the clamping assembly in the middle, and the front and rear sliding blocks 451 on the right side are synchronously moved to the left. Then, the sliding block 451 can be fixed to the fixed plate 42 corresponding to the fixing column through the cooperation between the insertion rod and the corresponding socket 466, and the clamping assembly and the control assembly on the right side are synchronously fixed.

[0057] Then, the arc plate 469 and the push rod 470 can be moved to the middle of the side plate 467 through the cooperation between the square rod and the corresponding square hole 468, ensuring that the subsequent push rod 470 can contact the right end face of the tubular blank without affecting the forming processing of the tubular blank. Then, the short-sized tubular blank can be placed horizontally to the left on the upper end of the bottom plate 421 of the three groups of clamping assemblies. The middle clamping assembly can limit the front and back center of the tubular blank in the same way as above, and make the right end face of the tubular blank contact with the evenly arranged push rods 470. The tubular blank is axially limited by the push rod 470. The rightward axial force generated during processing can be offset by the clamping force between the push rod 470 and the end of the tubular blank, preventing the subsequent tubular blank from axially moving during processing and affecting the forming effect. In addition, this process does not require left-right centering of the short-sized tubular blank, but the middle clamping assembly is still limited and reinforced by the limit block 437.

[0058] Subsequently, the three groups of clamping assemblies can be used to clamp the tubular blank at the same time in the same manner as described above. The clamping assemblies in the middle and on the right both firmly clamp the tubular blank, while the clamping assembly on the left remains in a relaxed state. Then, the inner cavity of the tubular blank can be milled from the left end thereof by the milling cutter 31 in the same manner, and the milling cutter 31 can form the spiral inner cavity inside the short-sized tubular blank at one time. During this process, the clamping assembly on the left still moves to the right through the cooperation of the pushing assembly and the linkage assembly to support and limit the tubular blank during processing, and the support plate 324 still synchronously supports the tubular blank segment after the inner cavity is formed.

[0059] After the spiral inner cavity of the long-sized tubular blank or the short-sized tubular blank is formed, the spindle unit 3, the milling cutter 31 and the pushing assembly can be reset to the left in the same way, and then the cooperation between the pushing assembly and the linkage assembly can be released. Then, the alignment assembly is reset to make the limit block 437 away from the middle clamping assembly, and then the control assembly is reset to release the clamping assembly from the tubular blank. Then the formed tubular blank can be removed, and the inner cavities of tubular blanks of different sizes can be processed in the same way later.

[0060] See also Figure 1-Figure 10 The present invention also provides a screw pump stator processing method, which specifically includes the following steps: S1, centering: for long-sized tubular blanks, the tubular blank to be processed can be placed horizontally and laterally between three groups of clamping components evenly arranged on the left and right, and then the left and right ends of the tubular blank are aligned and centered by the alignment component. For short-sized tubular blanks, the clamping component on the right can be moved to the clamping component close to the middle, and then the tubular blank to be processed can be placed horizontally and left-aligned between the three groups of clamping components.

[0061] S2. Clamping and fixing: Whether it is a long-sized tubular blank or a short-sized tubular blank, the tubular blank can be clamped by the clamping assembly in the same way. For the long-sized tubular blank, the clamping force of the middle clamping assembly can be made greater than the clamping force of the right-side clamping assembly, and the clamping force of the right-side clamping assembly is greater than the clamping force of the left-side clamping assembly. After the fixation is completed, the positioning assembly needs to be moved away from the tubular blank. For the short-sized tubular blank, the middle and right-side clamping assemblies both firmly clamp the tubular blank, while the left-side clamping assembly remains in a relaxed state. At the same time, the right end of the tubular blank needs to be limited by the limiting assembly.

[0062] S3, milling processing: through the cooperation between the feeding mechanism 2 and the spindle unit 3, the milling cutter 31 is moved right to process the inner cavity of the tubular blank. For long-sized tubular blanks, the pushing component can drive the clamping components and the control components on the left and right sides to move synchronously toward each other through the linkage component to complete the processing of the spiral inner cavity of the left half of the tubular blank. For short-sized tubular blanks, the pushing component can drive the clamping component and the control component on the left to move right through the linkage component, and the milling cutter 31 can complete the processing of the spiral inner cavity of the short-sized tubular blank at one time.

[0063] S4. Rotating the tubular blank: For a long tubular blank, the fixing unit 4 and the tubular blank can be rotated 180 degrees as a whole by controlling the rotating assembly, and then the unprocessed inner cavity portion of the tubular blank can be processed in the same way.

[0064] S5, release fixation: no matter it is a long-sized tubular blank or a short-sized tubular blank, after the spiral inner cavity of the tubular blank is formed, it is necessary to reset the spindle unit 3 and the milling cutter 31, and reset the clamping assembly at the same time, and then control the clamping assembly through the control assembly to release the clamping fixation of the tubular blank, and finally the tubular blank after processing and forming can be removed.

[0065] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0066] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "connect", "install", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, an integral connection, or a sliding connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0067] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, all equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A screw pump stator processing device, comprising a processing table (1), a CNC milling machine is arranged on the left side of the processing table (1), and the CNC milling machine is composed of a feeding mechanism (2) and a spindle unit (3), characterized in that: The upper end of the processing table (1) is provided with a fixing unit (4) for fixing the tubular blank; The fixing unit (4) comprises a rectangular plate (41) rotatably mounted on the upper end of the processing table (1); a fixing plate (42) is symmetrically mounted on the upper end of the rectangular plate (41) in front and rear; a positioning assembly for centering the tubular blank is arranged between the upper ends of the front and rear fixing plates (42); three groups of clamping assemblies evenly arranged left and right are arranged between the front and rear fixing plates (42); the clamping assembly comprises a bottom plate (421); the bottom plate (421) in the middle is fixedly mounted between the front and rear fixing plates (42); the remaining bottom plates (421) are all slidably mounted left and right between the front and rear fixing plates (42); the middle part of the bottom plate (421) is opened A sliding groove (422) is provided, and two front and rear symmetrical clamping plates (423) are slidably installed in the sliding groove (422), and a control plate (424) that slides through the sliding groove (422) is installed on the side away from the front and rear clamping plates (423). A control component for driving the corresponding front and rear control plates (424) to move synchronously and oppositely along the sliding groove (422) is provided below the bottom plate (421), and a limiting component for limiting the end of the tubular blank is provided at the right end of the bottom plate (421) located on the right side, and a driving component for driving the fixing unit (4) to rotate is provided on the processing table (1); The control assembly comprises a connecting rod (441) hinged at the lower ends of the corresponding front and rear control plates (424), the middle parts of the front and rear connecting rods (441) are cross-hinged, and one end of the connecting rod (441) away from the control plate (424) is hinged with a moving block (442), and the front and rear moving blocks (442) are slidably mounted on the upper end of the same connecting plate (443), and the lower end of the connecting plate (443) is connected to the pushing end of the electric push rod (444), and all the electric push rods (444) are installed together on the upper end of a strip plate (445) slidably connected to the rectangular plate (41) left and right, and the driving assembly comprises a rotating gear (11) installed at the lower end of the rectangular plate (41) and connected to the processing table (1) for rotation, and a driving gear (12) is meshed on the front side of the rotating gear (11), and the lower end of the driving gear (12) is connected to the output shaft of a motor (13) that rotates and penetrates the processing table (1), and the motor (13) is installed at the lower end of the processing table (1) through a support. A linkage assembly is arranged between the clamping assemblies on the left and right sides, the spindle unit (3) comprises a milling cutter (31) arranged at the right end of the feeding mechanism (2), and a pushing assembly for pushing the left clamping assembly to move rightward is arranged on both the front and rear sides of the milling cutter (31); The pushing assembly comprises two push columns (32) installed at the right end of the feeding mechanism (2) and distributed symmetrically with respect to the front and rear of the milling cutter (31); a fixed block (321) is installed at the right end of the push column (32); an automatic sliding block is slidably provided at the right end of the fixed block (321); a T-shaped block (322) is installed at the right end of the automatic sliding block; and the distance between the T-shaped block (322) and the left clamping assembly is greater than the distance between the right end surface of the milling cutter (31) and the left clamping assembly; The linkage assembly is located between the front and rear vertical sections of the inverted frame (43), and the linkage assembly includes a sliding block (451). The front and rear areas of the upper ends of the bottom plates (421) on the left and right sides are both installed with sliding blocks (451) that are slidably connected to the corresponding fixed plates (42). A T-shaped slot plate (452) that matches the T-shaped block (322) is installed on the side away from the two sliding blocks (451) on the left and right sides. A transverse rack (453) that is slidably connected to the corresponding fixed plates (42) is arranged on the sliding block (451). The transverse racks (453) corresponding to the relative sliding blocks (451) are distributed front and back, and an adjusting gear (454) rotatably connected to the corresponding fixed plate (42) is meshed between the two transverse racks (453). The front and rear sides of the upper ends of the left and right strip plates (445) are both equipped with connecting columns (455) that are slidably connected to the connecting plate (443) and slide through the corresponding sliding blocks (451). The fixed plates (42) on the front and rear sides are both provided with movable through grooves (456) that are slidably connected to the corresponding connecting columns (455) left and right.

2. The screw pump stator processing equipment according to claim 1, characterized in that: An arc-shaped groove is provided in the middle of the upper end of the bottom plate (421) located in the middle. Two strip grooves (425) arranged front to back are provided in the left and right areas of the upper end of the bottom plate (421) located in the middle and symmetrical with respect to the sliding groove (422). A fixing column is installed between the front and rear inner walls of the strip groove (425). A triangular baffle (426) connected to the corresponding strip groove (425) in a front-to-back sliding manner is slidably installed on the fixing column. The inclined surfaces of the corresponding front and rear triangular baffles (426) are arranged opposite to each other. A connecting spring (427) sleeved on the outside of the fixing column is connected between the inner side wall of the strip groove (425) and the corresponding triangular baffle (426).

3. The screw pump stator processing equipment according to claim 1, characterized in that: The alignment component comprises an inverted shaped frame (43) installed between the upper ends of the front and rear fixed plates (42); a square column is arranged at the lower end of the horizontal section of the inverted shaped frame (43); the square column is fixedly sleeved on the middle part of the fixed section of the bidirectional electric telescopic rod (431); the lower ends of the left and right telescopic ends of the bidirectional electric telescopic rod (431) are both installed with alignment plates (432); the front and rear sides of the square column are both installed with vertical plates (433) that slide up and down and penetrate the horizontal section of the inverted shaped frame (43); a push plate is installed between the upper ends of the front and rear vertical plates (433); a vertical guide rail (434) located on the left side of the push plate is installed at the upper end of the horizontal section of the inverted shaped frame (43); an electric slider (435) fixedly connected to the push plate is slidably installed on the vertical guide rail (434).

4. The screw pump stator processing equipment according to claim 3, characterized in that: A longitudinal plate (436) is arranged below the middle of the square column, a limiting block (437) is installed at the lower end of the longitudinal plate (436), a triangular slot cooperating with two front and rear clamping plates (423) in the clamping assembly located in the middle is provided at the lower end of the limiting block (437), a slide plate (438) slidingly penetrating the horizontal section of the inverted shaped frame (43) is installed on both the front and rear sides of the upper end of the longitudinal plate (436), a matching gear (439) rotatably installed at the lower end of the horizontal section of the inverted shaped frame (43) is arranged between the slide plate (438) and the corresponding vertical plate (433), a vertical rack (440 meshing with the matching gear (439) is installed on the opposite side of the slide plate (438) and the adjacent matching gear (439), an avoidance slide groove for avoiding the vertical rack (440) is provided on the horizontal section of the inverted shaped frame (43), and a square plate is installed on the upper end of the slide plate (438).

5. The screw pump stator processing equipment according to claim 1, characterized in that: The limiting assembly comprises a side plate (467) mounted on the right end of the bottom plate (421) located on the right side, the upper end of the side plate (467) is provided with square holes (468) evenly arranged front and back, the right side of the side plate (467) is provided with two arc plates (469) symmetrically distributed front and back, the inner side of the arc plate (469) is provided with evenly arranged support rods (470), and the left end of the arc plate (469) is provided with a square rod plugged into the corresponding square hole (468).

6. The screw pump stator processing equipment according to claim 1, characterized in that: The sliding block (451) on the left side is fixedly connected to its corresponding transverse rack (453), and a connecting block (461) is installed on the transverse rack (453) corresponding to the sliding block (451) on the right side. An adjusting telescopic rod (462) is rotatably installed on the upper end of the connecting block (461), and a support plate (463) is installed on the upper end of the telescopic end of the adjusting telescopic rod (462). A sleeve (464) matching with the upper end of the corresponding connecting column (455) is installed on the lower end of the support plate (463) close to the corresponding sliding block (451). An auxiliary plate is installed on the right end of the connecting block (461), and an auxiliary rod (465) matching with the sleeve (464) is installed on the upper end of the auxiliary plate. Two plug holes (466) distributed on the left and right are opened at the upper ends of the front and rear fixed plates (42) corresponding to the right side of the middle clamping assembly. The sliding block (451) on the right side is plugged and matched with the corresponding plug hole (466) through the plug rod.

7. A method for processing a screw pump stator, characterized in that: The process is completed by using a screw pump stator processing device as claimed in claim 1, comprising the following steps: S1. Centering alignment: For long-sized tubular blanks, the tubular blank to be processed can be horizontally placed between three groups of clamping assemblies evenly arranged on the left and right, and then the left and right ends of the tubular blank can be aligned and centered by the alignment assembly. For short-sized tubular blanks, the clamping assembly on the right can be moved to the clamping assembly close to the middle, and then the tubular blank to be processed can be horizontally placed between the three groups of clamping assemblies on the left; S2. Clamping and fixing: Whether it is a long-sized tubular blank or a short-sized tubular blank, the tubular blank can be clamped by the clamping assembly in the same way. For the long-sized tubular blank, the clamping force of the middle clamping assembly can be greater than the clamping force of the right-side clamping assembly, and the clamping force of the right-side clamping assembly is greater than the clamping force of the left-side clamping assembly. After the fixing is completed, the alignment assembly needs to be moved away from the tubular blank. For the short-sized tubular blank, the middle and right-side clamping assemblies both firmly clamp the tubular blank, while the left-side clamping assembly remains in a relaxed state, and the right end of the tubular blank needs to be limited by the limiting assembly; S3, milling processing: through the cooperation between the feeding mechanism (2) and the spindle unit (3), the milling cutter (31) is moved rightward to process the inner cavity of the tubular blank. For a long tubular blank, the pushing component can drive the clamping components and the control components on the left and right sides to move synchronously toward each other through the linkage component to complete the processing of the spiral inner cavity of the left half of the tubular blank. For a short tubular blank, the pushing component can drive the clamping component and the control component on the left side to move rightward through the linkage component, and the milling cutter (31) can complete the processing of the spiral inner cavity of the short tubular blank at one time. S4, rotating the tubular blank: for a long tubular blank, the fixing unit (4) and the tubular blank can be controlled by the rotating assembly to rotate 180 degrees as a whole, and then the unprocessed inner cavity part of the tubular blank is processed in the same way; S5, releasing the fixation: no matter it is a long-sized tubular blank or a short-sized tubular blank, after the spiral inner cavity of the tubular blank is formed, the spindle unit (3) and the milling cutter (31) need to be reset, and the clamping assembly is reset at the same time, and then the clamping assembly is controlled by the control assembly to release the clamping fixation of the tubular blank, and finally the tubular blank after processing and forming can be removed.

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