Inner support positioning tool for machining of composite cylinder

Abstract

The application relates to the technical field of cylinder inner support positioning tooling, in particular to an inner support positioning tooling for composite material cylinder machining. The technical scheme comprises a hydraulic inner support module applied to a cylinder, the hydraulic inner support module comprises an inner support bag with ductility and at least one sealing plate connected with the inner support bag, the sealing plate blocks the opening of the cylinder to form a sealed space in the cylinder, one end of the inner support bag is fixedly connected with the sealing plate, an axial expansion structure is arranged in the inner support bag and used for controlling the axial length of the inner support bag to be consistent with the internal length of the cylinder, a tensioning gradual change structure is further arranged in the inner support bag and used for gradually weakening the radial expansion degree of the inner support bag from one end to the other end, the inner support bag is uniformly expanded by driving of a hydraulic medium, full adhesion and uniform pressure support of the inner wall of the cylinder are realized, and the problems of easy deformation of a thin-walled composite material cylinder during machining and poor universality of traditional tooling are effectively solved.

Description

Technical Field

[0001] This invention relates to the field of internal support positioning fixtures for cylinders, and particularly to an internal support positioning fixture for machining composite material cylinders. Background Technology

[0002] Composite square cylinders, with their advantages of high specific strength and strong design flexibility, are widely used in aerospace, rail transportation, and special equipment. After being formed into blanks, these cylinders require high-precision machining at both ends to meet the dimensional and positional accuracy requirements of subsequent connection and assembly. Currently, the industry mainly uses three methods for machining composite square cylinders: machining with the original forming mold, custom-made special internal support molds, or making large external clamping fixtures. Some solutions also use simple internal support tooling with a hollow central shaft and a square support plate, but overall, no standardized and universal design system has been formed.

[0003] Existing internal support fixtures generally adopt a structure in which rigid support components are clearance-fitted with the inner wall of the cylinder. The support plate and the cylinder wall have point or line contact, resulting in concentrated support force and uneven stress distribution. During processing, thin-walled cylinders are prone to local deformation or damage. At the same time, the support plates of this type of fixture need to be customized for different cylinder cross-sectional dimensions. One set of fixtures cannot be used for multiple specifications, resulting in poor versatility, high manufacturing costs, and a heavy burden on fixture management. Summary of the Invention

[0004] The purpose of this application is to address the problems existing in the background art by proposing an internal support positioning fixture for machining composite material cylinders that can achieve full-fit pressure equalization support of the inner wall and effectively prevent local processing deformation of thin-walled cylinders.

[0005] The technical solution of this application is: an internal support positioning fixture for machining composite material cylinders, comprising: a hydraulic internal support module applied to the cylinder, the hydraulic internal support module including an extensible internal support bladder located inside the cylinder, at least one sealing plate connected to the internal support bladder, the sealing plate abutting against the open end of the cylinder and sealing the opening of the cylinder, so as to form a sealed space inside the cylinder to limit the expansion range of the internal support bladder. A hydraulic pump station is connected to the inner support bladder and inputs incompressible hydraulic medium into the inner support bladder under working conditions, and controls the pressure inside the inner support bladder to expand and fill the internal space of the cylinder.

[0006] Optionally, an axially extending structure is installed inside the inner support bladder to control the axial length of the inner support bladder to be consistent with the internal length of the cylinder and to keep the ends in contact.

[0007] Optionally, the axially extending structure includes a support cylinder fixedly installed on the sealing plate, a sealing block slidably and sealingly connected inside the support cylinder, and an extension rod fixedly installed on the sealing block, with a pressure plate for applying pressure to the inner support bladder fixedly installed at one end of the extension rod.

[0008] Optionally, one end of the inner support bladder is fixedly connected to the sealing plate.

[0009] Optionally, the sealing plate is provided with a first infusion hole communicating with the inner support bladder, and a first valve is fixedly installed on the first infusion hole; The sealing plate is provided with a second infusion hole that communicates with the support cylinder, and a second valve is fixedly installed on the second infusion hole.

[0010] Optionally, the hydraulic pump station includes an oil storage tank and a hydraulic pump fixedly installed on one side of the oil storage tank. The output end of the hydraulic pump is connected to a first pressure control valve and a second pressure control valve. The first pressure control valve is connected to the first valve through a first infusion pipe, and the second pressure control valve is connected to the second valve through a second infusion pipe.

[0011] Optionally, one end of the extension rod is equipped with a radial offset structure for radially positioning the inner support bladder on one side of the extension rod, which is used to control the entire end of the inner support bladder to move as a whole with the extension rod when it is not filled with hydraulic medium.

[0012] Optionally, the radial offset structure includes a mounting base fixedly installed at one end of the extension rod, multiple sliding cylinders fixedly installed on the mounting base, and a sliding rod slidably installed inside the sliding cylinders. A pressure strip is fixedly installed at the end of the sliding rod, and the pressure strip is fixedly connected to the inner support bladder.

[0013] Optionally, the inner support bladder is equipped with a tension gradient structure, which is used to gradually reduce the radial expansion of the inner support bladder from one end to the other when the internal pressure increases.

[0014] Optionally, the tension gradient structure includes multiple sets of tension ropes fixedly installed inside the inner support bladder and arranged in an array along the axis. The tension ropes are elastic, and the tension of the multiple sets of tension ropes gradually increases from one end to the other when they are at the same degree of tension.

[0015] In summary, this application includes at least one of the following beneficial technical effects: This application forms a sealed space by cooperating with the sealing plate and the cylinder, which restricts the expansion range of the inner support bladder to the inner cavity of the cylinder. This effectively prevents the bladder from bulging excessively from both ends of the cylinder during pressurization, which would lead to support failure. At the same time, by utilizing the incompressibility of the hydraulic medium, the cylinder can achieve a pressure equalization support effect of localized stress and overall load bearing when subjected to localized cutting forces. Compared with the point contact or line contact method of traditional rigid support plates, this significantly reduces the stress concentration on the inner wall of the cylinder, and is especially suitable for high-precision machining of thin-walled composite material cylinders. Attached Figure Description

[0016] Figure 1 Schematic diagram of the internal support positioning fixture Figure 1 ; Figure 2 Schematic diagram of the internal support positioning fixture Figure 2 ; Figure 3 for Figure 2 A magnified view of a section at point A in the middle; Figure 4 This is a structural diagram of the internal support bladder and sealing plate; Figure 5 This is a schematic diagram of the radial offset structure; Figure 6 This is a schematic diagram of a tensioned gradient structure; Figure 7 This is a schematic diagram of the hydraulic pump station.

[0017] Reference numerals: 1. Cylinder; 2. Hydraulic internal support module; 21. Internal support bladder; 22. Sealing plate; 221. First inlet port; 222. First valve; 223. Second inlet port; 224. Second valve; 23. Hydraulic pump station; 231. Oil storage tank; 232. Hydraulic pump; 233. First pressure control valve; 234. Second pressure control valve; 235. First inlet pipe; 236. Second inlet pipe; 24. Axial extension structure; 241. Support cylinder; 242. Sealing block; 243. Extension rod; 244. Pressure plate; 25. Radial offset structure; 251. Mounting base; 252. Slide cylinder; 253. Slide rod; 254. Pressure strip; 26. Tensioning gradient structure; 261. Pull rope; 3. Clamp. Detailed Implementation

[0018] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] Example: Figure 1 , Figure 2 and Figure 4As shown, this application proposes an internal support positioning fixture for machining composite material cylinders, including a hydraulic internal support module 2 applied to a cylinder 1. The hydraulic internal support module 2 includes an extensible internal support bladder 21 located inside the cylinder 1, and at least one sealing plate 22 connected to the internal support bladder 21. The sealing plate 22 abuts against the open end of the cylinder 1 and seals the opening of the cylinder 1, thereby forming a sealed space inside the cylinder 1 to limit the expansion range of the internal support bladder 21. One end of the internal support bladder 21 is fixedly connected to the sealing plate 22. By sealing the open end of the cylinder 1 through the sealing plate 22, a relatively closed cavity space is formed inside the cylinder 1, thereby limiting the radial expansion range of the internal support bladder 21 within the inner cavity area of ​​the cylinder 1, and preventing the internal support bladder 21 from excessively bulging out from both ends of the cylinder 1 during pressurization, which could lead to support failure or bladder damage.

[0020] When the cylinder 1 has only one opening, only one sealing plate 22 is needed to seal the opening. The closed end of the cylinder 1 itself can serve as the limiting surface on the other side. If the cylinder 1 has multiple openings, multiple sealing plates 22 need to be set to seal each opening to ensure that the internal space of the entire cylinder 1 is effectively sealed. In this embodiment, the cylinder 1 has two openings, so two sealing plates 22 are set to seal the two openings. The cylinder 1 and the sealing plate 22 will form a tight connection under the action of the machine tool fixture 3, so that the cylinder 1, the sealing plate 22 and the machine tool form a stable rigid system. The inner support bladder 21 is fixedly connected to one of the sealing plates 22. When the sealing plate 22 is installed, the inner support bladder 21 can be placed into the cylinder 1 together, which simplifies the tooling installation process.

[0021] like Figure 1 , Figure 2 and Figure 5 As shown, in this embodiment, an axial expansion structure 24 is installed inside the inner support bladder 21 to control the axial length of the inner support bladder 21 to be consistent with the internal length of the cylinder 1 and to keep the ends in contact. Under normal conditions, the inner support bladder 21 is in a contracted or folded state. If hydraulic medium is directly filled into it, since the bladder itself does not have a driving force to actively extend along the axial direction, the various parts of the inner support bladder 21 may squeeze and stack each other during the pressurization process, causing the bladder to be unable to effectively expand along the axial direction of the cylinder 1. As a result, some areas inside the cylinder 1 cannot be completely filled and covered by the inner support bladder 21. These uncovered areas cannot be supported during processing, and the cylinder 1 will still deform or vibrate at this position. By setting the axial expansion structure 24, the inner support bladder 21 can be stretched and expanded along the axial direction of the cylinder 1 before pressurization, so that the axial length of the inner support bladder 21 is consistent with the internal length of the cylinder 1 and the end is in contact with the inner end face of the cylinder 1. This ensures that the inner support bladder 21 can expand evenly in the radial direction during subsequent pressurization, achieving full coverage and support of the inner wall of the cylinder 1 without dead angles.

[0022] Furthermore, the axially extending structure 24 includes a support cylinder 241 fixedly installed on the sealing plate 22, a sealing block 242 slidably and sealingly connected inside the support cylinder 241, and an extension rod 243 fixedly installed on the sealing block 242. One end of the extension rod 243 is fixedly installed with a pressure plate 244 that applies pressure to the inner support bladder 21. By inputting hydraulic medium into the support cylinder 241, the sealing block 242 is driven to slide axially along the support cylinder 241. The sealing block 242 drives the extension rod 243 to extend. The pressure plate 244 at the end of the extension rod 243 pushes one end of the inner support bladder 21 to move along the axial direction of the cylinder 1 until this end of the inner support bladder 21 contacts the corresponding end face of the cylinder 1, thereby completing the axial arrangement of the inner support bladder 21 and ensuring that the inner support bladder 21 is fully expanded in the axial direction without wrinkles or stacking. Then, hydraulic medium is filled into the inner support bladder 21, which can make it expand evenly in the radial direction, thereby achieving full-coverage support for the inside of the cylinder 1.

[0023] like Figure 5 As shown, in this embodiment, a radial offset structure 25 is installed at one end of the extension rod 243 to radially position the inner support bladder 21 on one side of the extension rod 243. This structure is used to control the overall movement of the end of the inner support bladder 21 along with the extension rod 243 when it is not filled with hydraulic medium. The contact area between the pressure plate 244 and the inner support bladder 21 is limited. If the pressure plate 244 makes full coverage contact with the end of the inner support bladder 21, the elastic expansion and contraction capacity of that end of the inner support bladder 21 will be completely restricted. During subsequent pressurization, that end cannot expand radially normally, thereby forming a support blind zone between that end and the inner wall of the cylinder 1.

[0024] Therefore, the pressure plate 244 only needs to contact a local area at the end of the inner support bladder 21 to achieve the axial driving function. However, since the inner support bladder 21 is a flexible body, when the extension rod 243 pushes the local area at the end of the inner support bladder 21 to move axially through the pressure plate 244, the edge position at this end may lag because it is not directly pushed by the pressure plate 244. That is, the central area has moved into place with the extension rod 243, while the edge area remains in the original position, causing the end of the inner support bladder 21 to be concave or skewed. When filling with hydraulic medium later, this lagging edge material needs to rely on its own elasticity and hydraulic driving force to extend and expand to the edge again. This process not only prolongs the pressurization time, but may also cause the material in this area to be excessively stretched and thinned, affecting the service life of the bladder and the uniformity of support.

[0025] Furthermore, the radial offset structure 25 includes a mounting base 251 fixedly installed at one end of the extension rod 243, multiple sliding cylinders 252 fixedly installed on the mounting base 251, and a sliding rod 253 slidably installed inside the sliding cylinders 252. A pressure strip 254 is fixedly installed at the end of the sliding rod 253. The pressure strip 254 is fixedly connected to the inner support bladder 21. The multiple sliding cylinders 252 and the sliding rod 253 are evenly arranged circumferentially along the end of the inner support bladder 21. The pressure strip 254 at the end of each sliding rod 253 is fixedly connected to different areas of the end of the inner support bladder 21. When the extension rod 243 extends, the mounting base 251 drives all the sliding cylinders 252 to move synchronously. The sliding rod 253 then drives each pressure strip 254 to move synchronously, thereby simultaneously pulling and moving each area of ​​the end of the inner support bladder 21, including the edge, along the axial direction, ensuring that the entire end face is synchronously displaced with the extension rod 243.

[0026] Since the end cross-sectional dimensions of the inner support bladder 21 will change slightly due to the expansion and contraction of the bladder material when it moves axially, the sliding fit between the slide rod 253 and the slide cylinder 252 can adaptively compensate for this dimensional change. When the circumferential dimension of the end of the bladder changes, the slide rod 253 can freely expand and contract within the slide cylinder 252, which ensures reliable connection and synchronous traction of each region at the end of the inner support bladder 21, and does not restrict the normal elastic deformation of the bladder material due to rigid constraints.

[0027] like Figures 1 to 3 and Figure 7 As shown, in this embodiment, the sealing plate 22 is provided with a first infusion hole 221 communicating with the inner support bladder 21. A first valve 222 is fixedly installed on the first infusion hole 221. The sealing plate 22 is provided with a second infusion hole 223 communicating with the support cylinder 241. A second valve 224 is fixedly installed on the second infusion hole 223. Hydraulic medium can be input or discharged into the inner support bladder 21 through the first infusion hole 221. The first valve 222 controls whether the hydraulic medium inside the inner support bladder 21 can flow. When the first valve 222 is closed, a closed hydraulic chamber is formed inside the inner support bladder 21. The incompressibility of the hydraulic medium can be used to uniformly transmit the external pressure to the inner wall of the cylinder 1. When the first valve 222 is opened, pressurization or depressurization operations can be performed.

[0028] Similarly, the second infusion port 223 and the second valve 224 are used to control the input and output of hydraulic medium inside the support cylinder 241, so as to realize the driving control of the sealing block 242. When the second valve 224 is opened and hydraulic medium is input, the sealing block 242 drives the extension rod 243 to extend. When the second valve 224 is opened and medium is released, the sealing block 242 drives the extension rod 243 to retract.

[0029] Furthermore, this embodiment also includes a hydraulic pump station 23, which is connected to the inner support bladder 21 and inputs an incompressible hydraulic medium into the inner support bladder 21 under working conditions. The pressure inside the inner support bladder 21 is controlled to cause the inner support bladder 21 to expand and fill the internal space of the cylinder 1. After the inner support bladder 21 has been fully expanded along the axial direction of the cylinder 1 under the action of the axial expansion structure 24, the hydraulic pump station 23 inputs an incompressible hydraulic medium into the inner support bladder 21. Under the action of internal pressure, the inner support bladder 21 expands radially and uniformly until its outer surface is completely attached to the inner wall of the cylinder 1.

[0030] At this point, the inner support bladder 21 no longer has space to expand radially, and a rigid hydraulic support system is formed between the cylinder 1 and the inner support bladder 21. When the machine tool applies a cutting force to a certain local area of ​​the cylinder 1, forcing that area to deform inward, this deformation will compress the local space of the inner support bladder 21 at that location, thereby squeezing the hydraulic medium at that location. Since the hydraulic medium is an incompressible fluid and the inner support bladder 21 is a closed system, the squeezed hydraulic medium cannot be compressed. It can only transmit the pressure it receives through the medium itself to other areas of the inner support bladder 21 and even the inner wall of the entire cylinder 1, so that the overall structure of the cylinder 1 can jointly bear the local load, effectively preventing the cylinder 1 from deforming during local processing.

[0031] Specifically, the hydraulic pump station 23 includes an oil storage tank 231 and a hydraulic pump 232 fixedly installed on one side of the oil storage tank 231. The output end of the hydraulic pump 232 is connected to a first pressure control valve 233 and a second pressure control valve 234. The first pressure control valve 233 is connected to a first valve 222 through a first infusion pipe 235, and the second pressure control valve 234 is connected to a second valve 224 through a second infusion pipe 236. The hydraulic pump 232 draws hydraulic medium from the oil storage tank 231 and delivers the medium to the first infusion pipe 235 and the second infusion pipe 236 through the first pressure control valve 233 and the second pressure control valve 234, which are set in parallel.

[0032] The first pressure control valve 233 is connected to the first valve 222 and is used to control the pressure of the inner support bladder 21. By adjusting the output pressure of the first pressure control valve 233, the radial expansion force of the inner support bladder 21 can be precisely controlled to adapt to the processing requirements of cylinders 1 with different wall thicknesses and materials, and to avoid excessive pressure damaging the cylinder 1 or insufficient pressure providing insufficient support. The second pressure control valve 234 is connected to the second valve 224 and is used to control the driving pressure of the support cylinder 241, thereby controlling the extension and retraction of the extension rod 243.

[0033] like Figure 6As shown, in this embodiment, a tension gradient structure 26 is installed inside the inner support bladder 21. This structure is used to gradually reduce the radial expansion of the inner support bladder 21 from one end to the other when the internal pressure of the inner support bladder 21 increases. During the process of filling the inner support bladder 21 with hydraulic medium, if the inner support bladder 21 expands radially at the same time and uniformly, the gas that may exist between the inner support bladder 21 and the inner wall of the cylinder 1 will be sealed in the gap between the inner support bladder 21 and the inner wall of the cylinder 1 and cannot be discharged in time.

[0034] The trapped gas will form cavitation in local areas, causing the outer wall of the inner support bladder 21 in that area to be unable to directly adhere to the inner wall of the cylinder 1, thus forming a support void at that location. By setting a tension gradient structure 26, the radial expansion of the inner support bladder 21 during the pressurization process gradually decreases from one end to the other. That is, one end of the inner support bladder 21 expands radially first and contacts the inner wall of the cylinder 1. Then the radial expansion area gradually moves to the other end, like a zipper, gradually expelling the gas between the inner wall of the cylinder 1 and the inner support bladder 21 from the end that has not yet come into contact, thereby ensuring that the inner support bladder 21 eventually achieves complete adhesion to the inner wall of the cylinder 1.

[0035] Furthermore, the tension gradient structure 26 includes multiple sets of tension ropes 261 fixedly installed inside the inner support bladder 21 and arranged in an array along the axis. The tension ropes 261 are elastic, and the tension of the multiple sets of tension ropes 261 at the same degree of tension gradually increases from one end to the other. The two ends of the tension ropes 261 are respectively connected to the two inner side walls of the inner support bladder 21. When the internal pressure of the inner support bladder 21 increases, the wall surface of the inner support bladder 21 expands outward, and the tension ropes 261 are stretched accordingly. Because the multiple sets of tension ropes 261 at the same degree of tension... The tension gradually increases from one end to the other. That is, the tension of the rope 261 near the preferential expansion end is smaller and easier to stretch, while the tension of the rope 261 near the lagging expansion end is larger and more difficult to stretch. Therefore, under the same internal pressure, the inner support bladder 21 wall of the preferential expansion end with smaller tension will expand radially outward first, while the lagging expansion end with larger tension will start to expand radially later than the preferential expansion end. This achieves a gradual effect in which the radial expansion degree gradually decreases from one end to the other along the axial direction.

[0036] Working principle: The sealing plate 22 with the inner support bladder 21 fixed is installed at one end of the cylinder 1. The second valve 224 is opened, and hydraulic medium is input into the support cylinder 241 through the second inlet port 223 via the hydraulic pump station 23. This drives the sealing block 242 to slide along the axial direction of the support cylinder 241. The sealing block 242 drives the extension rod 243 to extend. The pressure plate 244 at the end of the extension rod 243 pushes one end of the inner support bladder 21 to move axially. During this process, the mounting base 251 of the radial offset structure 25 moves synchronously with the extension rod 243. Through the slide cylinder 252 and slide rod 253, each pressure bar 254 drives each area of ​​the end of the inner support bladder 21 to move synchronously without lag, until the inner support bladder 21 is fully extended along the axial direction of the cylinder 1 and both ends are in contact with the inner end face of the cylinder 1.

[0037] Close the second valve 224 and open the first valve 222. Incompressible hydraulic medium is introduced into the inner support bladder 21 through the first inlet port 221 via the hydraulic pump station 23. Under the action of the tension gradient structure 26, the tension of multiple sets of ropes 261 gradually increases from one end to the other, causing the radial expansion of the inner support bladder 21 to gradually decrease from one end to the other. This gradually discharges the gas between the inner support bladder 21 and the inner wall of the cylinder 1 from the end that has not yet expanded, ensuring that there is no cavitation residue.

[0038] When the inner support bladder 21 is fully expanded and fits against the inner wall of the cylinder 1, the pressure inside the inner support bladder 21 is kept constant by the first pressure control valve 233. By utilizing the incompressibility of the hydraulic medium, when the cylinder 1 is subjected to local cutting force, the pressure is transmitted to the entire inner wall of the cylinder 1 through the medium, so as to achieve the effect of equal pressure support with local force and overall load bearing.

[0039] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A type of internal support positioning fixture for machining composite material cylinders, characterized in that, include: A hydraulic internal support module (2) is applied to a cylinder (1). The hydraulic internal support module (2) includes an extensible internal support bladder (21) located inside the cylinder (1) and at least one sealing plate (22) connected to the internal support bladder (21). The sealing plate (22) abuts against the open end of the cylinder (1) and seals the opening of the cylinder (1), so that a sealed space is formed inside the cylinder (1) to limit the expansion range of the internal support bladder (21). The hydraulic pump station (23) is connected to the inner support bladder (21) and inputs an incompressible hydraulic medium into the inner support bladder (21) under working conditions, and controls the pressure inside the inner support bladder (21) to expand and fill the internal space of the cylinder (1); The inner support bladder (21) is equipped with a tension gradient structure (26) to gradually reduce the radial expansion of the inner support bladder (21) from one end to the other when the internal pressure of the inner support bladder (21) increases. The tension gradient structure (26) includes multiple sets of tension ropes (261) fixedly installed inside the inner support bladder (21) and arranged in an array along the axis. The tension ropes (261) are elastic, and the tension of the multiple sets of tension ropes (261) gradually increases from one end to the other when they are at the same degree of tension.

2. The internal support positioning fixture for machining composite material cylinders according to claim 1, characterized in that, An axial stretching structure (24) is installed inside the inner support bladder (21) to control the axial length of the inner support bladder (21) to be consistent with the internal length of the cylinder (1) and to keep the ends in contact.

3. The internal support positioning fixture for machining composite material cylinders according to claim 2, characterized in that, The axially extended structure (24) includes a support cylinder (241) fixedly installed on the sealing plate (22), a sealing block (242) slidably and sealingly connected inside the support cylinder (241), and an extension rod (243) fixedly installed on the sealing block (242). One end of the extension rod (243) is fixedly installed with a pressure plate (244) that applies pressure to the inner support bladder (21).

4. The internal support positioning fixture for machining composite material cylinders according to claim 3, characterized in that, One end of the inner support bladder (21) is fixedly connected to the sealing plate (22).

5. The internal support positioning fixture for machining composite material cylinders according to claim 4, characterized in that, The sealing plate (22) is provided with a first infusion hole (221) communicating with the inner support bladder (21), and a first valve (222) is fixedly installed on the first infusion hole (221). The sealing plate (22) is provided with a second infusion hole (223) that communicates with the support cylinder (241), and a second valve (224) is fixedly installed on the second infusion hole (223).

6. The internal support positioning fixture for machining composite material cylinders according to claim 5, characterized in that, The hydraulic pump station (23) includes an oil storage tank (231) and a hydraulic pump (232) fixedly installed on one side of the oil storage tank (231). The output end of the hydraulic pump (232) is connected to a first pressure control valve (233) and a second pressure control valve (234). The first pressure control valve (233) is connected to the first valve (222) through a first infusion pipe (235), and the second pressure control valve (234) is connected to the second valve (224) through a second infusion pipe (236).

7. The internal support positioning fixture for machining composite material cylinders according to claim 6, characterized in that, One end of the extension rod (243) is equipped with a radial offset structure (25) for radially positioning the inner support bladder (21) on one side of the extension rod (243), which is used to control the overall offset of the end of the inner support bladder (21) along with the extension rod (243) when it is not filled with hydraulic medium.

8. The internal support positioning fixture for machining composite material cylinders according to claim 7, characterized in that, The radial offset structure (25) includes a mounting base (251) fixedly installed at one end of the extension rod (243), multiple slide cylinders (252) fixedly installed on the mounting base (251), and a slide rod (253) slidably installed inside the slide cylinders (252). A pressure strip (254) is fixedly installed at the end of the slide rod (253), and the pressure strip (254) is fixedly connected to the inner support bladder (21).

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