An internal expansion device for joining composite materials

Abstract

An internal expansion device for joining composite materials includes a metal connector, a pressure vessel, a hydraulic mechanism, and a hydraulic cylinder connected to the hydraulic mechanism. A cylinder telescopic rod is connected to the hydraulic cylinder. A front support plate is fixed to the front side of the hydraulic cylinder. An internal expansion head is connected to the front end of the cylinder telescopic rod via a connecting sleeve. The head of the internal expansion head is located inside the pressure vessel, and the bottom end of the internal expansion head passes through the metal connector and is threadedly connected to the connecting sleeve. The connecting sleeve is threadedly connected to the cylinder telescopic rod. A base is connected to the front side of the front support plate. A clamping seat is connected to the front end of the base. A clamping half-ring is hinged to the clamping seat. In this invention, the cylinder telescopic rod and the internal expansion head are connected by threads, preventing axial bending and ensuring reliable connection. During pressure vessel installation, the pressure vessel is clamped between the clamping half-ring and the clamping seat, axially parallel to the internal expansion head, resulting in uniform force distribution during internal expansion of the metal connector.

Description

Technical Field

[0001] This utility model relates to the field of internal expansion equipment technology, and specifically to an internal expansion device for connecting composite materials. Background Technology

[0002] The utility model patent CN207657220U applied by Zhejiang Weixing New Building Materials Co., Ltd. provides a method for connecting composite pipe fittings with metal pipes on site. However, the hydraulic cylinder telescopic rod is connected to the internal expansion head by a pivot pin. During internal expansion, the tensile force is large, and the pivot pin has bent after repeated use, making disassembly difficult. In addition, there is no clamping device to fix the composite pipe during the installation of the metal pipe fitting and the internal expansion process. The composite pipe has already bent due to gravity, so the center line of the metal pipe fitting and the composite pipe is not on the same line, making it difficult to fit the metal pipe fitting on the outside of the composite pipe, or bending when the force is large. During internal expansion, the force on the internal expansion head and the metal pipe fitting is also uneven, and the internal expansion head has broken, resulting in the failure of internal expansion. Utility Model Content

[0003] The present invention aims to solve the technical problem of providing an internal expansion device that ensures uniform force distribution and prevents axial bending during the internal expansion of a metal connector.

[0004] To solve the above-mentioned technical problems, the technical solution of this utility model for an internal expansion device for joining composite materials is as follows:

[0005] The device includes a metal connector, a pressure vessel, a hydraulic mechanism, and a hydraulic cylinder connected to the hydraulic mechanism. The rear end of the pressure vessel is inserted into the metal connector. A cylinder telescopic rod is connected to the hydraulic cylinder. A front support plate is fixed to the front side of the hydraulic cylinder. A limit ring is connected to the inner side of the front support plate. An inner expansion head is connected to the front end of the cylinder telescopic rod through a connecting sleeve. The head of the inner expansion head is located inside the pressure vessel, and the bottom end of the inner expansion head passes through the metal connector and is threaded to the connecting sleeve. The connecting sleeve is threaded to the cylinder telescopic rod. A base is connected to the front side of the front support plate. A clamping seat for clamping the pressure vessel is connected to the front end of the base. A clamping half-ring is hinged to the clamping seat. One end of the clamping half-ring is hinged to the clamping seat, and the other end is detachably connected to the clamping seat through a fastening / disassembly buckle. The pressure vessel is clamped between the clamping half-ring and the clamping seat.

[0006] Both the inner side of the clamping half-ring and the inner side of the clamping seat are connected to clamping half-ring pads.

[0007] The hydraulic mechanism includes a hydraulic cylinder, a hydraulic pump body, and a distribution box; the hydraulic pump body is connected to the distribution box via a control line; the hydraulic cylinders are connected via a first pipe and a second pipe; a reversing handle is installed above the hydraulic cylinder; the hydraulic cylinder contains hydraulic oil, and the hydraulic pump body controls the hydraulic oil to circulate between the hydraulic cylinder and the hydraulic cylinder through the first pipe and the second pipe, thereby controlling the extension and retraction of the hydraulic cylinder extension rod; the distribution box contains a battery.

[0008] The distribution box is equipped with a start / pause button, a power switch, and an emergency stop button.

[0009] A pressure gauge is also installed above the oil cylinder.

[0010] The front end of the hydraulic cylinder is connected to a rear support plate; the front support plate is detachably connected to the rear support plate via a connecting rod; the two ends of the connecting rod are respectively locked with nuts to secure the rear support plate and the front support plate.

[0011] Handrails are installed on both sides above the cylinder, and pulleys are installed at the bottom of the cylinder; a hydraulic oil inlet is also connected above the cylinder.

[0012] The base is connected to the front support plate by fixing bolts.

[0013] The technical effects achievable by this utility model are as follows: the hydraulic cylinder telescopic rod and the inner expansion head are connected by threads, which prevents bending in the axial direction and ensures a reliable connection; when the pressure vessel is installed, the pressure vessel is clamped between the clamping half ring and the clamping seat, and is parallel to the inner expansion head in the axial direction, so that the metal connecting parts are subjected to uniform force when expanding internally, and the amount of internal expansion is consistent, so as not to cause skewing; the hydraulic pump body is driven by a battery, which is convenient for field operations. Attached Figure Description

[0014] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0015] Figure 1 This is a schematic diagram of the internal expansion device for connecting composite materials according to this utility model;

[0016] Figure 2 This is a schematic diagram of the hydraulic mechanism;

[0017] Figure 3 This is a partially exploded view of a composite material joining method according to this utility model;

[0018] Figure 4 This is a cross-sectional view of an internal expansion device for joining composite materials according to this utility model;

[0019] Figure 5 yes Figure 4 Enlarged view of part A. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings.

[0021] See Figures 1 to 5 .

[0022] An internal expansion device for joining composite materials includes a metal connector 6, a pressure vessel 1, a hydraulic mechanism, and a hydraulic cylinder 17 connected to the hydraulic mechanism; the rear end of the pressure vessel 1 is inserted into the metal connector 6; a cylinder extension rod 20 is connected to the hydraulic cylinder 17; a front support plate 8 is also fixed to the front side of the hydraulic cylinder 17, and a limit ring 7 is connected to the inner side of the front support plate 8. The limit ring 7 is composed of two half-rings (see reference). Figure 5 The front end of the hydraulic cylinder telescopic rod 20 is connected to an inner expansion head 29 via a connecting sleeve 28. The head of the inner expansion head 29 is located inside the pressure vessel 1, and the bottom end of the inner expansion head 29 passes through the metal connector 6 and is threadedly connected to the connecting sleeve 28. The connecting sleeve 28 is threadedly connected to the hydraulic cylinder telescopic rod 20. In this utility model, the hydraulic cylinder telescopic rod 20 and the inner expansion head 29 are connected by threads, which will not bend in the axial direction and the connection is reliable.

[0023] A base 5 is connected to the front side of the front support plate 8. Specifically, the base 5 is connected to the front support plate 8 by fixing bolts 21. A clamping seat 31 for clamping the pressure vessel 1 is connected to the front end of the base 5. A clamping half ring 3 is hinged on the clamping seat 31. One end of the clamping half ring 3 is hinged to the clamping seat 31, and the other end is detachably connected to the clamping seat 31 by fastening / removing buckle 4. The pressure vessel 1 is clamped between the clamping half ring 3 and the clamping seat 31. Preferably, clamping half ring pads 2 are connected to the inner side of the clamping half ring 3 and the inner side of the clamping seat 31. When the pressure vessel 1 of this utility model is installed, the pressure vessel 1 is clamped between the clamping half ring 3 and the clamping seat 31, and is parallel to the inner expansion head 29 in the axial direction. When the metal connector 6 expands, the force is uniform and the amount of expansion is consistent, so as not to cause skew.

[0024] Specifically, the front end of the hydraulic cylinder 17 is connected to the rear support plate 18; the front support plate 8 is detachably connected to the rear support plate 18 via a connecting rod 19, and the two ends of the connecting rod 19 are respectively locked with nuts 22 to the rear support plate 18 and the front support plate 8; the above-mentioned detachable connection structure of this utility model is convenient to install and easy to disassemble.

[0025] Specifically, the hydraulic mechanism includes a cylinder 15, a hydraulic pump body 12, and a distribution box 13; the hydraulic pump body 12 is connected to the distribution box 13 via a control line 27, and the cylinder 15 and the hydraulic cylinder 17 are connected via a first pipe 16 and a second pipe 41; a reversing handle 9 is installed above the cylinder 15; the cylinder 15 contains hydraulic oil, which is controlled by the hydraulic pump body 12, so that the hydraulic oil circulates between the hydraulic cylinder 17 and the cylinder 15 through the first pipe 16 and the second pipe 41, thereby controlling the extension and retraction of the cylinder extension rod 20; specifically, a pressure gauge 10 is also installed above the cylinder 15, and a start / pause button 24, a power switch 25, and an emergency stop button 23 are installed above the distribution box 13, which contains a battery; preferably, handrails 11 are installed on both sides above the cylinder 15, and pulleys 26 are installed at the bottom of the cylinder 15; a hydraulic oil inlet 14 is also connected above the cylinder 15.

[0026] In this invention, hydraulic cylinder 15 receives hydraulic oil through hydraulic oil inlet 14. The hydraulic oil is controlled by hydraulic pump body 12, causing it to circulate between hydraulic cylinder 17 and cylinder 15 via first pipe 16 and second pipe 41, thereby controlling the extension and retraction of cylinder telescopic rod 20. Specifically, when cylinder telescopic rod 20 extends forward, oil enters through first pipe 16 and exits through second pipe 41; when cylinder telescopic rod 20 retracts, oil exits through first pipe 16 and enters through second pipe 41. The reversing handle 9 controls whether oil enters through first pipe 16 and exits through second pipe 41 or vice versa. Pressure gauge 10 measures the pressure of cylinder 15. A battery is built into the distribution box 13, which drives hydraulic pump body 12 for convenient field operations.

Claims

1. An internal expansion device for joining composite materials, comprising a metal connector (6), a pressure vessel (1), a hydraulic mechanism, and a hydraulic cylinder (17) connected to the hydraulic mechanism; the rear end of the pressure vessel (1) is inserted into the metal connector (6); a cylinder telescopic rod (20) is connected to the hydraulic cylinder (17); a front support plate (8) is fixed to the front side of the hydraulic cylinder (17); a limit ring (7) is connected to the inner side of the front support plate (8); an internal expansion head (29) is connected to the front end of the cylinder telescopic rod (20) through a connecting sleeve (28), characterized in that: The head of the inner expansion head (29) is located inside the pressure vessel (1), and the bottom end of the inner expansion head (29) passes through the metal connector (6) and is threadedly connected to the connecting sleeve (28); the connecting sleeve (28) is threadedly connected to the cylinder telescopic rod (20); the front support plate (8) is connected to the base (5); the front end of the base (5) is connected to the clamping seat (31) for clamping the pressure vessel (1); the clamping seat (31) is hinged to the clamping half ring (3); one end of the clamping half ring (3) is hinged to the clamping seat (31), and the other end is detachably connected to the clamping seat (31) through the fastening / disassembly buckle (4); the pressure vessel (1) is clamped between the clamping half ring (3) and the clamping seat (31).

2. The internal expansion device for joining composite materials according to claim 1, characterized in that: The inner side of the clamping half ring (3) and the inner side of the clamping seat (31) are both connected to clamping half ring pads (2).

3. The internal expansion device for joining composite materials according to claim 1, characterized in that: The hydraulic mechanism includes a cylinder (15), a hydraulic pump body (12), and a distribution box (13); the hydraulic pump body (12) is connected to the distribution box (13) via a control line (27); the cylinder (15) and the hydraulic cylinder (17) are connected via a first pipe (16) and a second pipe (41); a reversing handle (9) is installed above the cylinder (15); the cylinder (15) contains hydraulic oil, and the hydraulic pump body (12) controls the hydraulic oil, so that the hydraulic oil circulates between the hydraulic cylinder (17) and the cylinder (15) through the first pipe (16) and the second pipe (41), thereby controlling the extension and retraction of the cylinder extension rod (20); the distribution box (13) contains a battery.

4. The internal expansion device for joining composite materials according to claim 3, characterized in that: The distribution box (13) is equipped with a start / pause button (24), a power switch (25) and an emergency stop button (23).

5. An internal expansion device for joining composite materials according to claim 3, characterized in that: A pressure gauge (10) is also installed above the oil cylinder (15).

6. The internal expansion device for joining composite materials according to claim 1, characterized in that: The hydraulic cylinder (17) is connected to a rear support plate (18) at its front end; the front support plate (8) is detachably connected to the rear support plate (18) via a connecting rod (19); the two ends of the connecting rod (19) are respectively locked with nuts (22) to the rear support plate (18) and the front support plate (8).

7. The internal expansion device for joining composite materials according to claim 1, characterized in that: Handrails (11) are installed on both sides above the cylinder (15), and pulleys (26) are installed at the bottom of the cylinder (15); a hydraulic oil inlet (14) is also connected above the cylinder (15).

8. An internal expansion device for joining composite materials according to claim 1, characterized in that: The base (5) is connected to the front support plate (8) by fixing bolts (21).

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