Water pressure tool structure for thin-wall composite material cylinder

Abstract

The invention relates to the technical field of tools, in particular to a hydraulic pressure tool structure for a thin-wall composite material cylinder. According to the technical scheme, the protection piece comprises a sealing plug, a blocking piece, a transferring opening, an annular groove and a rubber ring air bag, the inner wall of a plug is slidably connected with the sealing plug, the transferring opening is formed in the plug, the sealing plug blocks the end of the transferring opening, the blocking piece for blocking the sealing plug from sliding is arranged in the plug, and the rubber ring air bag is arranged in the blocking piece. The end of the transfer opening communicates with a rubber ring air bag, and an annular groove is formed in the inner wall of the hoop. After a water pressure test is finished, due to the inertia of water, the sealing plug moves when thrust borne by the sealing plug is larger than blocking force, so that the water is introduced into the rubber ring air bag, the rubber ring air bag contains the water to increase the internal area of the cylindrical workpiece and reduce the water pressure borne by the cylindrical workpiece, and meanwhile, the rubber ring air bag is opened by the water to block the annular groove; and the problem of water leakage caused by overlarge water pressure is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of tooling, and in particular to a thin-wall composite material cylinder hydraulic tooling structure. Background Art

[0002] The development of composite materials provides a lightweight and high-strength solution for thin-walled cylinder fixtures. These materials usually have anisotropic properties and can provide excellent mechanical properties in a specific direction, which are suitable for fields such as ships, aerospace, etc. Before use, the thin-walled composite cylinder needs to be hydrostatically tested to test its strength and sealing. Water is injected into the pipe through a water pump. During the test, a hydraulic fixture is usually used to fix the cylinder.

[0003] In the patent document with the announcement number CN110186771B, a hydraulic tool is proposed, including a connecting rod, a connecting piece with an internal cavity fixed to both ends of the connecting rod in a detachable manner, a sealing component with a built-in cavity connected to an external hydraulic device fixedly connected to the connecting piece in a detachable manner, the sealing component is fixed to the outer end of the connecting piece opposite to the connecting rod, the built-in cavity is connected to the internal cavity, and the internal cavity has at least one water outlet hole connected to the outside of the connecting piece. The present invention solves the technical problem of the prior art that it is difficult to seal the pipe mouth of the connecting pipe when the inner pipe section of the pipe mouth is short and the outer wall of the pipe mouth is not provided with a block, and provides a hydraulic tool for the heating surface tube screen of the waste heat boiler. The present invention has the advantages of simple structure, safety and reliability, and easy use.

[0004] After the water pressure test, the water pump is turned off to stop injecting water into the cylinder. When the water pump stops suddenly, the inertia of the water flow will cause it to continue to flow forward for a distance, and then flow in the opposite direction due to the constraints of the pipeline, causing pressure fluctuations, which will cause the cylinder to have a pressure that exceeds its test standard, resulting in errors in the experiment. Summary of the invention

[0005] The purpose of the present invention is to address the problem in the background technology that a sudden stop of a water pump causes pressure fluctuations that lead to experimental errors, and to propose a thin-walled composite material cylinder hydraulic tooling structure.

[0006] The technical solution of the present invention is: a thin-wall composite material cylindrical hydraulic tooling structure, applied to a cylindrical workpiece, comprising: both ends of the cylindrical workpiece are sleeved with a clamp, and the two clamps are respectively threadedly connected with a plug and a clamping cylinder; The protective member includes a closing plug, an obstruction member, a transfer port, an annular groove and a rubber ring airbag, wherein the inner wall of the plug is slidably connected to the closing plug, the transfer port is provided inside the plug, the closing plug is blocked at the end of the transfer port, an obstruction member for obstructing the sliding of the closing plug is provided inside the plug, the end of the transfer port is connected to the rubber ring airbag, the inner wall of the clamp is provided with an annular groove, and the rubber ring airbag is embedded in the annular groove; The rubber ring airbag adopts a circular ring structure, the inner arc surface of the rubber ring airbag is provided with a notch, a pull rod is passed through the center of the cylindrical workpiece, and the end of the pull rod is threadedly connected with the center of the plug.

[0007] Optionally, an arc-shaped opening is provided inside the plug, the arc-shaped opening is connected to the transfer port, the arc-shaped opening adopts a fan-shaped structure, the arc-shaped opening is abutted against the opening of the inner arc surface of the rubber ring airbag, and a first return spring is elastically connected between the end of the closure plug and the plug.

[0008] Optionally, the obstruction member includes an avoidance groove, an obstruction block and an obstruction spring, the inside of the plug is provided with an avoidance groove perpendicular to the closing plug, the avoidance groove is slidably connected to the obstruction block, and the end of the obstruction block is elastically connected to the obstruction spring with the plug.

[0009] Optionally, the end of the closing plug adopts a truncated cone structure, and the obstruction block is provided with an inclined surface at one end facing the closing plug, and the inclined surface of the obstruction block abuts against the truncated cone end of the closing plug.

[0010] Optionally, a fluctuation limiting component is provided inside the plug, and the fluctuation limiting component includes a hydraulic component, an intermediate pipe, a second hydraulic oil pipe and a supplementary cylinder. A hydraulic component is provided at the end of the closing plug, and the hydraulic component is connected to the intermediate pipe. The other end of the intermediate pipe is connected to the second hydraulic oil pipe. The supplementary cylinder slides in the second hydraulic oil pipe, and the diameter of the supplementary cylinder is the same as the diameter of the closing plug.

[0011] Optionally, a second piston is fixedly mounted at the end of the supplementary cylinder, the diameter of the second piston is larger than the diameter of the supplementary cylinder, the end opening diameter of the second hydraulic oil pipe is the same as the diameter of the supplementary cylinder, and the diameter of the second piston is the same as the diameter of the second hydraulic oil pipe.

[0012] Optionally, the hydraulic component includes a push rod, a first hydraulic oil pipe and a first piston. The push rod is fixedly installed at the center of the end of the closing plug. The first hydraulic oil pipe is opened on the inner wall of the plug. The interior of the first hydraulic oil pipe is slidably connected to the first piston. The end of the push rod is inserted into the first hydraulic oil pipe and fixedly connected to the first piston. The first hydraulic oil pipe is connected to the intermediate pipe.

[0013] Optionally, a pull rod is passed through the interior of the cylindrical workpiece, and both ends of the pull rod are threadedly connected to the plug and the clamping tube respectively. A water inlet is opened at the end of the pull rod, and a water outlet is opened in the middle of the pull rod. Sealing gaskets are fixedly installed inside the plug and the clamping tube.

[0014] Optionally, a positioning assembly is provided at the end of the pull rod, and the positioning assembly includes a water inlet, a slide cylinder, a block and a positioning ring. A water inlet is opened at the end of the plug near the threaded connection with the pull rod, and the water inlet is perpendicular to the pull rod. The inside of the water inlet is slidably connected to the slide cylinder, and the end of the slide cylinder is fixedly connected to the block. A positioning ring is opened at the shaft of the pull rod and near the threaded position, and the block is clamped with the positioning ring.

[0015] Optionally, a water-sealing hose is fixedly installed on one end of the slide away from the block, the other end of the water-sealing hose is fixedly connected to the water inlet, and a second return spring is elastically connected between one end of the block away from the pull rod and the plug.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: After the water pressure test of the present invention is completed, the water pump is turned off. Due to the inertia of water, a part of water will continue to flow to the right. At this time, the cylindrical workpiece is not only affected by the water pressure, but also by the force formed by the inertia of water. The thrust received by the closing plug is greater than the resistance force and the workpiece is displaced, thereby introducing water into the rubber ring airbag. The rubber ring airbag contains water to increase the internal area of ​​the cylindrical workpiece, reduce the water pressure received by the cylindrical workpiece, and at the same time, the rubber ring airbag is expanded by water to block the annular groove, thereby avoiding water leakage caused by excessive water pressure.

[0017] Furthermore, since the diameter of the supplementary cylinder is the same as the diameter of the closing plug, when the closing plug moves and expands the internal volume of the cylindrical workpiece, the plug and the clamping tube, the supplementary cylinder supplements the missing volume. In the process of introducing water into the rubber ring airbag at the transfer port, the water pressure is continuously reduced, thereby avoiding water pressure fluctuations that will cause the pipeline material to undergo repeated stress changes, and fatigue of the pipeline material under long-term action.

[0018] Furthermore, the blocking block is pushed out by water pressure and stuck between the thread on the pull rod and the water inlet, thereby fixing the position of the pull rod and preventing the water pressure from exerting excessive axial force on the plug and the clamping tube, causing the plug and the clamping tube to separate from the pull rod, causing potential safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Provide the overall structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the pull rod structure in a separated state; Figure 3 It is a schematic diagram of the rubber ring airbag structure; Figure 4 It is a cross-sectional schematic diagram of the plug structure; Figure 5 for Figure 4 A part of the enlarged schematic diagram of the hindering block structure; Figure 6 for Figure 4 A magnified schematic diagram of the card block structure of part B; Figure 7 is a schematic diagram of the structure of the first hydraulic oil pipe; Figure 8 This is a schematic diagram of the positioning ring structure.

[0020] Figure numerals: 1. cylindrical workpiece; 2. plug; 3. clamping cylinder; 4. clamp; 5. pull rod; 6. protective part; 61. closing plug; 62. first return spring; 63. avoidance slide groove; 64. blocking block; 65. blocking spring; 66. transfer port; 67. arc opening; 68. annular groove; 69. rubber ring airbag; 7. fluctuation limiting assembly; 71. push rod; 72. first hydraulic oil pipe; 73. first piston; 74. intermediate pipe; 75. second hydraulic oil pipe; 76. second piston; 77. supplementary cylinder; 8. positioning assembly; 81. water inlet; 82. slide cylinder; 83. water-sealing soft leather hose; 84. block; 85. second return spring; 86. positioning ring. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] The components of the embodiments of the present invention generally described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention.

[0023] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Example 1 This embodiment proposes a thin-wall composite material cylinder hydraulic tooling structure, such as Figure 1 As shown, it is applied to a cylindrical workpiece 1, including a clamp 4 at both ends of the cylindrical workpiece 1, and the two clamps 4 are respectively threadedly connected with a plug 2 and a clamping tube 3, and the plug 2 and the clamp 4 clamp one end of the cylindrical workpiece 1, and the clamping tube 3 and the clamp 4 clamp the other end of the cylindrical workpiece 1. A pressure sensor is set at the end of the cylindrical workpiece 1 to detect the internal water pressure.

[0027] like Figure 1 and 2 As shown, a pull rod 5 is passed through the interior of the cylindrical workpiece 1, and both ends of the pull rod 5 are threadedly connected to the plug 2 and the clamping tube 3 respectively. A water inlet is provided at the end of the pull rod 5, and a water outlet is provided in the middle of the pull rod 5. Sealing gaskets are fixedly installed inside the plug 2 and the clamping tube 3. The pull rod 5 uses threads to tighten the hydraulic tooling and the plug with axial force to ensure that no displacement occurs during the hydraulic pressure test. The clamp uses radial force to press the end of the cylinder to ensure that no pressure relief occurs at the end of the cylinder during the hydraulic pressure test. By adjusting the pre-tightening force of the pull rod 5, the axial force generated by the plugging cover under the action of the internal water pressure can be effectively balanced to prevent the plugging cover from displacement or sealing failure, and effectively balance the axial force generated by the plugging cover under the action of the internal water pressure.

[0028] like Figure 3 and Figure 4 As shown, a protective member 6 is provided inside the plug 2, and the protective member 6 includes a closing plug 61, an obstruction member, a transfer port 66, an annular groove 68 and a rubber ring airbag 69. The inner wall of the plug 2 is slidably connected to the closing plug 61. An obstruction member for obstructing the sliding of the closing plug 61 is provided inside the plug 2, and the sliding of the closing plug 61 is obstructed by the obstruction member. A first return spring 62 is elastically connected between the end of the closing plug 61 and the plug 2. When the pressure of the water pressure acting on the closing plug 61 is greater than the elastic force of the first return spring 62 and the obstruction force of the closing plug 61, the closing plug 61 can move.

[0029] The plug 2 has a transfer port 66 formed inside, and the closing plug 61 blocks the end of the transfer port 66. The end of the transfer port 66 is connected to a rubber ring airbag 69, and an annular groove 68 is formed on the inner wall of the hoop 4, and the rubber ring airbag 69 is embedded in the annular groove 68.

[0030] Water is pumped by a water pump and injected through the water injection port at the end of the pull rod 5, so that the interior of the cylindrical workpiece 1 is filled with water. After the water pressure test is completed, the water pump is turned off. Due to the inertia of the water, a part of the water will still try to continue to flow to the right, and due to the presence of the plug 2, the water will exert a radial force on the cylindrical workpiece 1 after impacting the plug 2, causing the water pressure on the cylindrical workpiece 1 to be greater than the test standard water pressure, which will cause damage to the cylindrical workpiece 1.

[0031] The standard test water pressure is the same as the obstruction force of the obstruction member on the closing plug 61. After the water pump is turned off, when the water pressure on the cylindrical workpiece 1 is greater than the obstruction force of the obstruction member on the closing plug 61, the closing plug 61 is moved by the water pressure and leaks out of the transfer port 66. Water enters the rubber ring airbag 69 from the transfer port 66, and the water expands the rubber ring airbag 69 and completely fills the annular groove 68. The water in the cylindrical workpiece 1 is collected by the rubber ring airbag 69 to prevent the cylindrical workpiece 1 from being subjected to excessive water pressure. At the same time, the rubber ring airbag 69 is filled to block the annular groove 68 to prevent water from leaking from the gap between the plug 2 and the cylindrical workpiece 1 after the water pressure is too high.

[0032] like Figure 4 As shown, an arc-shaped opening 67 is provided inside the plug 2, and the arc-shaped opening 67 is connected to the transfer port 66. The arc-shaped opening 67 adopts a fan-shaped structure, and the arc-shaped opening 67 is close to the opening of the inner arc surface of the rubber ring airbag 69 to increase the water inlet area of ​​the rubber ring airbag 69 and avoid the water pressure being concentrated at one point to burst the rubber ring airbag 69.

[0033] like Figure 4 and Figure 5 As shown, the blocking member includes an avoidance chute 63, a blocking block 64 and a blocking spring 65. The inside of the plug 2 is provided with an avoidance chute 63 perpendicular to the closing plug 61. The blocking block 64 is slidably connected in the avoidance chute 63. The end of the blocking block 64 is elastically connected to the plug 2 with the blocking spring 65. The end of the closing plug 61 adopts a truncated cone structure. The blocking block 64 is provided with an inclined surface at one end facing the closing plug 61. The inclined surface of the blocking block 64 abuts against the truncated cone end of the closing plug 61. The blocking block 64 is elastically supported by the blocking spring 65 to abut against the end of the closing plug 61 and prevent the closing plug 61 from sliding. When the water pressure on the closing plug 61 is greater than the blocking force of the blocking block 64 on the closing plug 61, the closing plug 61 slides.

[0034] In this embodiment, after the water pressure test is completed, the water pump is turned off. Due to the inertia of water, some water will continue to flow to the right. At this time, the cylindrical workpiece 1 is not only affected by the water pressure, but also by the force formed by the inertia of water. The thrust received by the closing plug 61 is greater than the resistance force and it moves, thereby introducing water into the rubber ring airbag 69. The rubber ring airbag 69 contains water to increase the internal area of ​​the cylindrical workpiece 1 and reduce the water pressure received by the cylindrical workpiece 1. At the same time, the rubber ring airbag 69 is expanded by water to block the annular groove 68 to avoid water leakage caused by excessive water pressure.

[0035] Example 2 Based on Example 1, this example proposes a thin-wall composite material cylinder hydraulic tooling structure, such as Figure 5 and Figure 7 As shown, the plug 2 is provided with a fluctuation limiting assembly 7 inside, and the fluctuation limiting assembly 7 includes a hydraulic component, an intermediate tube 74, a second hydraulic oil pipe 75 and a supplementary cylinder 77. The end of the closing plug 61 is provided with a hydraulic component, and the hydraulic component is connected to the intermediate tube 74. The other end of the intermediate tube 74 is connected to the second hydraulic oil pipe 75. The supplementary cylinder 77 slides in the second hydraulic oil pipe 75, and the diameter of the supplementary cylinder 77 is the same as the diameter of the closing plug 61. A second piston 76 is fixedly installed at the end of the supplementary cylinder 77, and the diameter of the second piston 76 is larger than the diameter of the supplementary cylinder 77. The end opening diameter of the second hydraulic oil pipe 75 is the same as the diameter of the supplementary cylinder 77, and the diameter of the second piston 76 is the same as the diameter of the second hydraulic oil pipe 75.

[0036] The hydraulic parts include a push rod 71, a first hydraulic oil pipe 72 and a first piston 73. The push rod 71 is fixedly installed at the center of the end of the closing plug 61. The first hydraulic oil pipe 72 is opened on the inner wall of the plug 2. The first hydraulic oil pipe 72 is slidably connected to the first piston 73. The end of the push rod 71 penetrates into the first hydraulic oil pipe 72 and is fixedly connected to the first piston 73. The first hydraulic oil pipe 72 is connected to the intermediate pipe 74. The closing plug 61 moves and the push rod 71 pushes the first piston 73 to move, and the hydraulic oil in the first piston 73 is pressed into the second hydraulic oil pipe 75, so that the second piston 76 and the supplementary cylinder 77 move.

[0037] After the closing plug 61 moves, the supplementary cylinder 77 is displaced by the hydraulic pressure. Since the diameter of the supplementary cylinder 77 is the same as the diameter of the closing plug 61, and the distance moved by the closing plug 61 is the same as the distance moved by the supplementary cylinder 77, the volume inside the cylindrical workpiece 1, the plug 2 and the clamping tube 3 is maintained.

[0038] In this embodiment, since the diameter of the supplementary cylinder 77 is the same as the diameter of the closing plug 61, when the closing plug 61 moves and expands the internal volume of the cylindrical workpiece 1, the plug 2 and the clamping tube 3, the supplementary cylinder 77 supplements the missing volume. In the process of introducing water into the rubber ring airbag 69 through the transfer port 66, the water pressure is continuously reduced, thereby avoiding water pressure fluctuations that will cause the pipeline material to undergo repeated stress changes. Under long-term action, the pipeline material will produce fatigue.

[0039] Example 3 Based on the above-mentioned embodiment 1 or embodiment 2, this embodiment proposes a thin-wall composite material cylinder hydraulic tooling structure, such as Figure 6 and Figure 8 As shown, a positioning assembly 8 is provided at the end of the pull rod 5, and the positioning assembly 8 includes a water inlet 81, a slide 82, a block 84 and a positioning ring 86. The end of the plug 2 is provided with a water inlet 81 near the threaded connection with the pull rod 5, and the water inlet 81 is perpendicular to the pull rod 5. The inside of the water inlet 81 is slidably connected to the slide 82, and the end of the slide 82 is fixedly connected to the block 84. A positioning ring 86 is provided at the rod body of the pull rod 5 and near the threaded position, and the block 84 is clamped with the positioning ring 86.

[0040] During the water pressure test, water enters from the water inlet 81 , and the water pressure acts on the slide 82 and the block 84 , causing the block 84 to be stuck between the thread on the pull rod 5 and the water inlet 81 , thereby fixing the position of the pull rod 5 .

[0041] A water-sealing hose 83 is fixedly mounted on one end of the slide 82 away from the block 84, and the other end of the water-sealing hose 83 is fixedly connected to the water inlet 81. A second return spring 85 is elastically connected between one end of the block 84 away from the pull rod 5 and the plug 2. The water-sealing hose 83 prevents water from leaking between the slide 82 and the water inlet 81, and the second return spring 85 is used to return the block 84.

[0042] In this embodiment, the blocking block 84 is pushed out by water pressure and stuck between the thread on the pull rod 5 and the water inlet 81, thereby fixing the position of the pull rod 5 and preventing the water pressure from exerting excessive axial force on the plug 2 and the clamping tube 3, causing the plug 2 and the clamping tube 3 to separate from the pull rod 5, causing potential safety hazards.

[0043] The above specific embodiments are only several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant inspirations of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A thin-wall composite material cylindrical hydraulic tooling structure, applied to a cylindrical workpiece (1), characterized in that: include: Both ends of the cylindrical workpiece (1) are sleeved with clamps (4), and the two clamps (4) are respectively threadedly connected with a plug (2) and a clamping cylinder (3); The protective member (6) comprises a closing plug (61), an obstruction member, a transfer port (66), an annular groove (68) and a rubber ring airbag (69); the inner wall of the plug (2) is slidably connected to the closing plug (61); the transfer port (66) is provided inside the plug (2); the closing plug (61) is blocked at the end of the transfer port (66); an obstruction member for obstructing the sliding of the closing plug (61) is provided inside the plug (2); the end of the transfer port (66) is connected to the rubber ring airbag (69); the inner wall of the clamp (4) is provided with an annular groove (68); the rubber ring airbag (69) is embedded in the annular groove (68); The rubber ring airbag (69) has a circular ring structure, and a notch is provided on the inner arc surface of the rubber ring airbag (69). A pull rod (5) is passed through the center of the cylindrical workpiece (1), and the end of the pull rod (5) is threadedly connected to the center of the plug (2).

2. A thin-wall composite material cylindrical hydraulic tooling structure according to claim 1, characterized in that: The plug (2) is provided with an arc-shaped opening (67) inside, the arc-shaped opening (67) being in communication with the transfer port (66), the arc-shaped opening (67) being of a fan-shaped structure, the arc-shaped opening (67) being in contact with the opening of the inner arc surface of the rubber ring airbag (69), and a first return spring (62) being elastically connected between the end of the closing plug (61) and the plug (2).

3. A thin-wall composite material cylindrical hydraulic tooling structure according to claim 2, characterized in that: The obstruction member comprises an avoidance slot (63), an obstruction block (64) and an obstruction spring (65); the inside of the plug (2) is provided with an avoidance slot (63) perpendicular to the closing plug (61); the inside of the avoidance slot (63) is slidably connected to the obstruction block (64); and the end of the obstruction block (64) is elastically connected to the plug (2) via the obstruction spring (65).

4. A thin-wall composite material cylindrical hydraulic tooling structure according to claim 3, characterized in that: The end of the closing plug (61) adopts a truncated cone structure, and the obstruction block (64) is provided with an inclined surface at one end facing the closing plug (61), and the inclined surface of the obstruction block (64) abuts against the truncated cone end of the closing plug (61).

5. The thin-wall composite material cylindrical hydraulic tooling structure according to claim 1, characterized in that: A fluctuation limiting component (7) is arranged inside the plug (2), and the fluctuation limiting component (7) comprises a hydraulic component, an intermediate tube (74), a second hydraulic oil pipe (75) and a supplementary cylinder (77). A hydraulic component is arranged at the end of the closing plug (61), and the hydraulic component is connected to the intermediate tube (74). The other end of the intermediate tube (74) is connected to the second hydraulic oil pipe (75). The supplementary cylinder (77) slides in the second hydraulic oil pipe (75), and the diameter of the supplementary cylinder (77) is the same as the diameter of the closing plug (61).

6. A thin-wall composite material cylindrical hydraulic tooling structure according to claim 5, characterized in that: A second piston (76) is fixedly mounted on the end of the supplementary cylinder (77); the diameter of the second piston (76) is larger than the diameter of the supplementary cylinder (77); the diameter of the end opening of the second hydraulic oil pipe (75) is the same as the diameter of the supplementary cylinder (77); and the diameter of the second piston (76) is the same as the diameter of the second hydraulic oil pipe (75).

7. A thin-wall composite material cylindrical hydraulic tooling structure according to claim 6, characterized in that: The hydraulic component comprises a push rod (71), a first hydraulic oil pipe (72) and a first piston (73); the push rod (71) is fixedly installed at the center of the end of the closing plug (61); the first hydraulic oil pipe (72) is opened on the inner wall of the plug (2); the first hydraulic oil pipe (72) is slidably connected to the first piston (73) inside; the end of the push rod (71) penetrates into the first hydraulic oil pipe (72) and is fixedly connected to the first piston (73); the first hydraulic oil pipe (72) is connected to the intermediate pipe (74).

8. The thin-wall composite material cylindrical hydraulic tooling structure according to claim 1, characterized in that: A pull rod (5) is inserted into the cylindrical workpiece (1), and the two ends of the pull rod (5) are respectively threadedly connected to the plug (2) and the clamping tube (3). A water inlet is provided at the end of the pull rod (5), and a water outlet is provided in the middle of the pull rod (5). Sealing gaskets are fixedly installed inside the plug (2) and the clamping tube (3).

9. The thin-wall composite material cylindrical hydraulic tooling structure according to claim 8, characterized in that: A positioning assembly (8) is provided at the end of the pull rod (5), and the positioning assembly (8) includes a water inlet (81), a slide cylinder (82), a clamping block (84) and a positioning ring (86). The end of the plug (2) is provided with a water inlet (81) near the threaded connection with the pull rod (5), and the water inlet (81) is perpendicular to the pull rod (5). The inside of the water inlet (81) is slidably connected to the slide cylinder (82), and the end of the slide cylinder (82) is fixedly connected to the clamping block (84). A positioning ring (86) is provided at the rod body of the pull rod (5) and near the threaded position, and the clamping block (84) is clamped with the positioning ring (86).

10. The thin-wall composite material cylindrical hydraulic tooling structure according to claim 9, characterized in that: A water-sealing hose (83) is fixedly mounted on one end of the slide cylinder (82) away from the clamping block (84); the other end of the water-sealing hose (83) is fixedly connected to the water inlet (81); and a second return spring (85) is elastically connected between one end of the clamping block (84) away from the pull rod (5) and the plug (2).

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