Plastic pipe pressing and sealing device

Abstract

The utility model belongs to the technical field of plastic pipe detection, and particularly relates to a plastic pipe pressing and sealing device which comprises a pressing piece, a sealing assembly, a locking piece and a pressing connecting piece, the pressing connecting piece is arranged at the end of a plastic pipe, the sealing assembly and the locking piece are arranged between the pressing connecting piece and the pressing piece, the sealing assembly is arranged close to the pressing connecting piece, and the locking piece is arranged close to the pressing piece. The locking piece comprises at least two arc-shaped locking blocks, the locking blocks are connected end to end through elastic connecting pieces, the number of the elastic connecting pieces is smaller than that of the locking blocks by only one, the two ends of each elastic connecting piece are fixedly connected with the two adjacent locking blocks respectively, the pressing piece is pressed on one side of the locking piece, and the sealing assembly is pressed on the other side of the locking piece. The locking blocks are connected through the elastic connecting pieces, on the basis that the locking function of the locking pieces is guaranteed, the locking pieces are convenient to take, the locking pieces can be automatically arranged on the plastic pipe in a sleeving mode, manpower for installation of the device is reduced, meanwhile, installation of the device is more convenient, and the installation efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of plastic pipe detection, and in particular relates to a plastic pipe pressure sealing device. Background Art

[0002] In most plastic pipe production fields, such as PE pipe (polyethylene), RTP (reinforced flexible thermoplastic composite pipe), etc., it is required to conduct internal pressure resistance performance tests and destructive internal pressure resistance performance tests as well as long-term hydrostatic pressure tests. The service life of plastic pipes depends on the pipes' resistance to thermal oxygen aging and creep deformation characteristics under long-term hydrostatic pressure. The pipes' pressure resistance time and the maximum pressure value of instantaneous destruction under long-term constant internal pressure and constant temperature are the test items for pipe manufacturers and testing agencies. Among them, the pressure resistance test refers to subjecting a given section of plastic pipe fittings to a specified constant internal pressure for a given period of time to observe whether the specimen is damaged. The sealing joints are installed at both ends of the specimen to connect it to the specimen and the pressure device, so that the specimen cannot be subjected to axial forces or damage the specimen.

[0003] During pressure testing, the sealing type of plastic pipes is generally selected in accordance with the provisions of GB / T 6111-2018 "Determination of internal pressure resistance of thermoplastic plastic piping systems for fluid transportation", and Type A sealing devices are selected. However, the locking blocks in the sealing devices currently used for pressure testing are split. Manual installation of the locking blocks requires the collaboration of 2 to 3 people, and multiple locking blocks need to remain fixed in position at the same time. The installation requires high skills and difficulty, and the installation efficiency is low. Utility Model Content

[0004] The utility model aims to overcome the deficiencies of the prior art and provide a plastic pipe pressure sealing device, which is simple and convenient to install, reduces manpower and labor, and improves installation efficiency.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a plastic pipe pressing and sealing device, including a pressing piece, a sealing assembly, a locking piece and a pressing connection piece, the pressing connection piece is arranged at the end of the plastic pipe, the sealing assembly and the locking piece are arranged between the pressing connection piece and the pressing piece, the sealing assembly is arranged close to the pressing connection piece, the locking piece includes at least two arc-shaped locking blocks, the locking blocks are connected end to end by elastic connections, the number of elastic connections is less than that of the locking blocks and is only one less, the two ends of the elastic connection piece are respectively fixedly connected to two adjacent locking blocks, the pressing piece is pressed on one side of the locking piece, and the other side of the pressing piece presses the sealing assembly.

[0006] Preferably, the elastic connecting member is a leaf spring, and two ends of the leaf spring are connected to two adjacent locking blocks by rivets.

[0007] Preferably, a truncated cone portion with a gradually decreasing diameter is provided at one end of the locking member close to the pressing member, and a pressing portion is correspondingly provided on the pressing member.

[0008] Preferably, a thread is provided on the inner wall of the locking member.

[0009] Preferably, the pressing connection piece is a pressing flange, which is installed at the end of the plastic pipe, and a pressing hole is provided on the pressing flange.

[0010] Preferably, the clamping member is a pressing flange, and the pressing flange is connected to the pressing flange by bolts.

[0011] Preferably, the sealing assembly includes a top ring and a sealing ring, wherein the sealing ring is arranged on a side of the top ring close to the pressing connector, the locking member is pressed against the top ring, and the top ring is pressed against the sealing ring.

[0012] Preferably, a sealing portion is provided on one side of the pressing connector close to the locking member, the aperture of the sealing portion is larger than the diameter of the plastic tube, and the sealing ring is pressed tightly inside the sealing portion.

[0013] Compared with the prior art, the above technical solution has the following beneficial effects:

[0014] 1. The compression piece of the utility model compresses and locks the locking piece, so that the locking piece locks the plastic pipe. The locking piece is composed of at least two locking blocks spliced ​​together, which can adapt to the compression of plastic pipes with different diameters. At the same time, several locking blocks are connected by elastic connecting pieces, which ensures the locking function of the locking piece and facilitates the taking of the locking piece. The locking piece can be automatically sleeved on the plastic pipe without multiple manual hands, which reduces the manpower and labor for installing the device, and at the same time makes the installation of the device more convenient and improves the installation efficiency.

[0015] 2. The locking blocks are connected well, which avoids the problem of misalignment of the locking blocks caused by manual installation of several locking blocks.

[0016] 3. The clamping part of the pressing flange is conical, so that it can cooperate with the truncated cone part of the locking piece and make the clamping of the locking piece more reliable.

[0017] 4. The inner wall of the locking piece is provided with threads. When the pressure flange locks the locking piece, the force causes the inner thread of the locking piece to bite into the outer surface of the plastic pipe evenly, forming an effective seal and fixation to ensure the normal pressure test. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a cross-sectional view of the utility model.

[0019] Figure 2 It is an explosion diagram of the utility model.

[0020] Figure 3 It is a plan view of the locking block in the utility model.

[0021] Figure 4 It is a structural schematic diagram of the locking block in the utility model.

[0022] Among them: 1, plastic pipe 2, buckling flange 3, bolt 4, locking piece 5, top ring 6, sealing ring 7, pressing flange 8, pressing hole 9, leaf spring 10, rivet 11, frustum part 12, sealing part 401, first locking block 402, second locking block 403, third locking block. DETAILED DESCRIPTION

[0023] Figures 1 to 4 It is the best embodiment of the utility model, and the following Figures 1 to 4 The utility model is further described.

[0024] like Figure 1~2 As shown, a plastic pipe pressure sealing device of the utility model comprises a pressing member, a sealing assembly, a locking member 4 and a pressing connector. The pressing connector is arranged at the end of the plastic pipe 1, and a pressure test is performed inside the plastic pipe 1 through the pressing connector. The sealing assembly and the locking member 4 are arranged between the pressing connector and the pressing member. The sealing assembly is arranged close to the pressing connector, the pressing member is pressed on one side of the locking member 4, and the other side of the locking member 4 presses the sealing assembly. The locking member 4 comprises at least two arc-shaped locking blocks, which can adapt to the pressing of plastic pipes 1 with different diameters. The locking blocks are connected end to end by elastic connectors, which facilitates the taking of the locking member 4. The number of elastic connectors is less than that of the locking blocks and is only one less. The two ends of the elastic connector are respectively fixedly connected to two adjacent locking blocks, which ensures the locking function of the locking member 4 and reduces the manpower and labor for installing the device. The locking member 4 can be automatically sleeved on the plastic pipe 1.

[0025] The pressing connection part in this embodiment is a pressing flange 7, which is installed at the end of the plastic pipe 1. A pressing hole 8 is provided on the pressing flange 7, and the pressing hole 8 is provided in the middle of the pressing flange 7. After the device is installed, the pressing device is connected to the pressing hole 8, and a pressure test is performed in the plastic pipe 1 through the pressing hole 8. The corresponding pressing part in this embodiment is a pressing flange 2, which is connected to the pressing flange 7 by bolts 3. In the process of connecting and fixing the pressing flange 2 and the pressing flange 7, the pressing flange locks the locking part 4, and the locking part 4 presses the sealing assembly onto the pressing flange 7.

[0026] The locking member 4 is provided with a truncated cone portion 11 with a gradually decreasing diameter at one end close to the pressing flange 2, and a pressing portion 12 is correspondingly provided on the pressing flange 2. The inner diameter of the pressing portion 12 gradually increases along the side close to the locking member 4, and is provided corresponding to the truncated cone portion 11 on the locking member 4. When the pressing flange 2 is connected to the pressing flange 7, the pressing portion 12 of the pressing flange 2 presses the truncated cone portion 11 on the locking member 4, ensuring that the locking member 4 is firmly combined with the plastic pipe 1, thereby ensuring that the plastic pipe 1 is clamped. At the same time, a thread is provided on the inner wall of the locking member 4. When the pressing flange 7 locks the locking member 4, the force causes the inner thread of the locking member 4 to evenly bite into the outer surface of the plastic pipe 1, thereby forming an effective seal and fixation, and ensuring that the pressing test is carried out normally. In other embodiments, the pressing member may also be a nut or a threaded sleeve.

[0027] The sealing assembly includes a top ring 5 and a sealing ring 6. The sealing ring 6 is arranged on the side of the top ring 5 close to the pressing flange 7. The pressing flange 2 presses the locking member 4 on the top ring 5, and the top ring 5 is pressed on the sealing ring 6. A sealing portion 12 is arranged on the side of the pressing flange 7 close to the locking member 4. The aperture of the sealing portion 12 is larger than the diameter of the plastic pipe 1. There is a gap, namely the sealing portion 12, between the side of the pressing flange 7 close to the sealing assembly and the outer wall of the plastic pipe 1. The sealing ring 6 is pressed in the sealing portion 12. Specifically, the diameter of one end of the top ring 5 close to the locking member 4 is larger, and the diameter of the other end is roughly the same as the inner diameter of the sealing portion 12. The locking member 4 presses the top ring 5, and the other end of the top ring 5 is pushed into the sealing portion 12 of the pressing flange 7, and then the sealing ring 6 is pressed in the innermost part of the sealing portion 12 for sealing. The sealing ring 6 adopts an O-ring.

[0028] like Figure 3~4 As shown, the locking member 4 in this embodiment is composed of three arc-shaped locking blocks, namely the first locking block 401, the second locking block 402 and the third locking block 403. The elastic connecting member in this embodiment is a leaf spring 9, and the two ends of the leaf spring 9 are connected to two adjacent locking blocks through rivets 10, that is, a leaf spring 9 is connected at the end of the first locking block 401 and the front end of the second locking block 402, and a leaf spring 9 is also provided at the end of the second locking block 402 and the front end of the third locking block 403. No elastic connecting member is provided between the end of the last locking block and the front end of the first locking block, that is, no leaf spring 9 is provided at the end of the third locking block 403 and the front end of the first locking block 401, so as to ensure the convenient taking of the locking member 4 and ensure the locking function of the locking member 4. The leaf spring 9 in other embodiments can also be replaced by a rubber band, but its use effect is not as good as the leaf spring 9.

[0029] When performing a pressure test on the plastic pipe 1, the device is installed at both ends of the plastic pipe 1, the pressure hole 8 on the pressure flange 7 at one end is connected to the pressure device for pressure testing, and the pressure hole 8 on the pressure flange 7 at the other end can be provided with a pressure relief valve as an exhaust hole.

[0030] When the utility model is in use, the plastic pipe 1 is placed, and the pipe end is suspended, the buckling flange 2, the top ring 5 and the sealing ring 6 are sequentially sleeved on the plastic pipe 1, the pressing flange 7 is sleeved on the appropriate position of the plastic pipe 1, and the pipe end of the plastic pipe 1 is inserted into the appropriate position of the pressing flange 7 and fixed, the locking piece 4 is placed between the buckling flange 2 and the top ring 5, and the position of the locking piece 4 is fixed by hand, and the buckling flange 2 and the pressing flange 7 are locked by bolts 3, so that the locking piece 4 locks the plastic pipe 1 under the pressure of the buckling flange 2, and at the same time tightens the top ring 5, and tightens the sealing ring 6 to shrink, and the sealing ring 6 shrinks and presses the plastic pipe 1 to play a sealing role, and the device is installed at both ends of the plastic pipe 1, so that the pressing hole 8 at one end of the plastic pipe 1 is connected to the pressing device for a pressing test; after the test is completed, the pressure is released through the exhaust hole at the other end. After the pressure release is completed, the device can be disassembled in the reverse direction of the installation process. The locking piece 4 of the utility model is convenient for taking out the locking piece 4 on the basis of ensuring the locking function. The locking piece 4 can be automatically sleeved on the plastic pipe 1 without multiple manual hands, which reduces the manpower and labor for installing the device, and at the same time makes the installation of the device more convenient and improves the installation efficiency.

[0031] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.

Claims

1. A plastic pipe pressure sealing device, characterized in that: The invention comprises a pressing member, a sealing assembly, a locking member (4) and a pressing connection member, wherein the pressing connection member is arranged at the end of the plastic tube (1), the sealing assembly and the locking member (4) are arranged between the pressing connection member and the pressing member, the sealing assembly is arranged close to the pressing connection member, the locking member (4) comprises at least two arc-shaped locking blocks, the locking blocks are connected end to end by an elastic connection member, the number of the elastic connection members is less than the number of the locking blocks and only one is less, the two ends of the elastic connection member are respectively fixedly connected to two adjacent locking blocks, the pressing member is pressed on one side of the locking member (4), and the other side of the locking member (4) presses the sealing assembly.

2. A plastic pipe pressure sealing device according to claim 1, characterized in that: The elastic connecting member is a leaf spring (9), and two ends of the leaf spring (9) are connected to two adjacent locking blocks via rivets (10).

3. A plastic pipe pressure sealing device according to claim 1, characterized in that: A truncated cone portion (11) with a gradually decreasing diameter is provided at one end of the locking member (4) close to the pressing member, and a pressing portion is correspondingly provided on the pressing member.

4. A plastic pipe pressure sealing device according to claim 1, characterized in that: A thread is provided on the inner wall of the locking member (4).

5. The plastic pipe pressure sealing device according to claim 1, characterized in that: The pressing connection piece is a pressing flange (7), which is installed at the end of the plastic pipe (1), and a pressing hole (8) is provided on the pressing flange (7).

6. A plastic pipe pressure sealing device according to claim 5, characterized in that: The clamping member is a pressing flange (2), and the pressing flange (2) is connected to the pressing flange (7) via bolts (3).

7. The plastic pipe pressure sealing device according to claim 1, characterized in that: The sealing assembly comprises a top ring (5) and a sealing ring (6), wherein the sealing ring (6) is arranged on a side of the top ring (5) close to the pressing connection piece, the locking piece (4) is pressed against the top ring (5), and the top ring (5) is pressed against the sealing ring (6).

8. A plastic pipe pressure sealing device according to claim 7, characterized in that: A sealing portion (12) is provided on one side of the press-fit connector close to the locking member (4); the aperture of the sealing portion (12) is larger than the diameter of the plastic tube (1); and the sealing ring (6) is pressed tightly inside the sealing portion (12).

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