[0026] The present invention will be further described below in conjunction with the drawings and embodiments. However, the use and purpose of these exemplary embodiments are only used to illustrate the present invention, and do not constitute any limitation to the actual protection scope of the present invention, let alone limit the protection scope of the present invention.
[0027] Such as figure 1 , figure 2 with image 3 As collectively shown in, the present invention provides a plastic pipe interface device, the plastic pipe interface device mainly includes a flaring device for flaring the end of the plastic pipe 19 into a bell mouth and a flaring device for tightening and connecting the bell mouth The flaring device includes a flaring inner body 1 and a flaring outer body connected together. A flared cavity is formed between the flaring inner body 1 and the flaring outer body. The inner heating element 6 on the inner mouth body 1 and the outer heating element 5 arranged on the flared outer body. The horn-shaped cavity includes a straight barrel section cavity and a horn section cavity arranged in sequence, and the section of the straight barrel section cavity and the plastic tube 19 The shape is matched, the cavity of the horn section is adapted to the shape of the horn mouth, the heating temperature in the cavity of the horn section is higher than the heating temperature in the cavity of the straight cylinder section, and the heating temperature of the cavity of the straight cylinder section is generally lower than that of the plastic tube 19, while the heating temperature of the horn section cavity is between the melting temperature and the decomposition temperature of the plastic tube 19. The end of the straight cylinder section cavity away from the horn section cavity is set to be open; the connecting device includes a coupling 16 and The joint 17, the coupling 16 is sleeved on the outer surface of the unflared plastic pipe 19. The coupling 16 is provided with a mating end that matches the outer diameter of the plastic pipe 19 and a connecting end with an internal thread. The thread diameter of the connecting end Larger diameter than the bell mouth, between the connecting end and the mating end is provided with a tapered surface that expands from the mating end to the connecting end and is adapted to the taper of the bell mouth. The connector 17 is installed on the inner surface of the bell mouth. The plastic pipe 19 has a flow channel with the same inner diameter. One end of the joint 17 is provided with a supporting end consistent with the taper of the bell mouth, and the other end of the joint 17 is provided with a flange connection end. The joint 17 between the supporting end and the flange connection end is provided There are external threads that match the internal threads of the coupling 16; the two couplings 16 are respectively sleeved on the ends of two oppositely arranged plastic pipes 19, and the ends of the plastic pipes 19 are respectively expanded into bell mouths using a flaring device, Remove the flaring device, install the joint 17 on the inner surface of the bell mouth, connect the corresponding joint 17 and the coupling 16 respectively, and connect the two flange connection ends together. A sealing ring 18 is provided between the two flange connection ends. The sealing ring 18 is preferably a metal graphite spiral wound gasket. When the interface distance is different, the number of layers of the sealing ring 18 can be adjusted to adapt to the firmness and tightness of the interface connection between the two plastic pipes.
[0028] When in use, first insert the end of the plastic tube 19 into the cavity of the straight section to soften the end, rotate the flaring inner body 1 and move the flaring inner body 1 toward the support body 7, and introduce the softened plastic tube 19 into the horn section cavity , And melt in this cavity, the inner heating element 6 and the outer heating element 5 around the cavity of the straight barrel section and the horn section cavity are individually controlled. During the melting stage of the plastic tube 19, the inner heating element 6 around the cavity of the straight barrel section Neither the heating element 5 nor the outer heating element 5 will continue to be heated. The use of this flaring method overcomes the defect that the thickness of the plastic tube after the traditional flaring device is flared and the strength of the plastic tube is reduced. Generally, heating wires are used for both the inner heating element 6 and the outer heating element 5, of course, other types such as high-pressure steam can also be used.
[0029] If the plastic tube 19 is a double-layer plastic tube, the flaring device can better reflect its use value. During use, the plastic pipe is softened. The heating temperature of the inner heating element 6 corresponds to the melting temperature of the inner layer of the plastic pipe, and the heating temperature of the outer heating element 5 corresponds to the melting temperature of the outer layer of the plastic pipe. The two layers of plastic pipes are softened simultaneously , To avoid internal stress in the softening stage.
[0030] Of course, some of the flaring devices are also disclosed in the previous patent documents, but the inventor has paid a lot of creative work and developed a more suitable device by himself to realize the flaring of the plastic pipe 19, especially for At present, the commonly used double-layer plastic pipe, because the inner and outer layers of the double-layer plastic pipe have different components, their softening temperatures are different. If the same temperature is used to control the softening of the end of the plastic pipe 19, the double-layer plastic pipe will be combined. The layer generates internal stress, leading to delamination or cracking, which affects the normal use of the plastic pipe 19.
[0031] Before the end of the plastic pipe 19 is softened, a support device is placed in the plastic pipe 19. The purpose of the first is to increase the rigidity of the plastic pipe 19 and avoid deformation of the end of the plastic pipe 19 during operation. The other is to facilitate the operation and expand The mouth device is a leverage point. For the above two purposes, the support device structure used by the inventor has also been carefully studied, which has changed the traditional concept of using a backing ring as a support. The support device of the present invention includes a columnar support 7 on which the support 7 is provided. Axially extending and passing through the first slide of the supporting body 7, the cross-sectional shape of the first slide is square, the sliding block 9 is installed in the first slide, and the supporting body 7 is provided with two oppositely arranged and radially extending The second chute, the second chute is connected to the first chute, each second chute is slidably installed with a contact 14 and one end of the contact 14 abuts the slider 9, and the surface where the slider 9 abuts the contact 14 In order to push the contact 14 to the wedge-shaped surface of the plastic tube 19, the other end extends out of the support body 7. The outer surface of the support body 7 is sleeved with a pressure ring 8. The pressure ring 8 is fixedly mounted on the support body 7, and the contact 14 The pressure ring 8 is extended and a first return spring 13 is provided between the contact 14 and the pressure ring 8; both ends of the first channel are provided with a first blocking block 10 and a second blocking block 11, the first blocking block 10 and The second blocking blocks 11 are fixedly installed on the support body 7. The first blocking block 10 is threadedly connected with a screw rod 20. One end of the screw rod 20 is pressed against the slider 9 and the other end extends out of the bell mouth. A second return spring 12 is clamped between the sliding blocks 9, an annular protrusion is provided on the end surface of the second blocking block 11, and the end of the second return spring 12 is sleeved on the annular protrusion. The assembled support 7 is placed in the plastic tube 19, the screw 20 extends out of the end of the plastic tube 19, and when the screw 20 is rotated, the contact 14 is extended to hold the inner wall of the plastic tube 19 tightly. To avoid deformation of the plastic tube 19, after the outer support 3 is supported at the position of the plastic tube 19, continue to rotate the screw 20, and the contact 14 will hold the plastic tube 19 tightly.
[0032] The flaring outer body includes a plurality of outer body monomers 2 in a circular array. Each outer body monomer 2 is hingedly mounted on the flaring inner body 1 through a separate hinge 4. The outer surface of the flaring outer body away from the hinged end is provided with several outer bodies. The clamping element 15 which is clamped together by the monomer 2 can be a clamp or an annular tension spring connected end to end. With the flared outer body in this way, the outer heating element 5 is generally not arranged in a circumferential arrangement, but is arranged along the extension direction of the outer body monomer 2, so that when disassembling, it is not necessary to consider re-dismounting the outer heating element. 5. It further saves maintenance time.
[0033] Similarly, the flaring device can also be designed in other forms. For example, the outer body unit 2 is connected to the flaring inner body 1 by fasteners. However, this operation is slightly complicated, and the disassembly and installation are time-consuming and laborious.
[0034] As another ingenious idea of the present invention, each outer body unit 2 is provided with an outer support part 3, the outer support part 3 extends away from the flared inner body 1, the outer support part 3 and the flared outer body. As a whole, the outer support 3 not only supports the plastic tube 19 before softening. After the plastic tube 19 is softened, when the flared inner body 1 is rotated, the outer support 3 also plays a holding role, and the outer support 3 will harden The high-quality plastic tube 19 is wrapped to provide sufficient support. For ease of installation and use, the clamping element 15 is installed at the end of the outer support 3.
[0035] The working process is as follows:
[0036] (1) Clean the inner and outer surfaces of the end of the plastic pipe 19;
[0037] (2) A coupling 16 is fitted on the outer surface of the plastic pipe 19;
[0038] (3) Place the support 7 in the plastic tube 19, rotate the screw 20, make the contact 14 extend and contact the inner wall of the plastic tube 19, apply a certain pre-tightening force, and insert the end of the plastic tube 19 into the flaring inner body 1. And the outer support part 3 covers the position of the contact 14, rotate the screw 20 so that the contact 14 supports the inner wall of the plastic tube 19, rotate the flared inner body 1, and the flared inner body 1 is supported under the force of the screw 20 The body 7 moves in the direction, and the end of the plastic tube 19 is inserted into the cavity of the straight section;
[0039] (4) The inner heating element 6 and the outer heating element 5 around the straight section cavity are energized to soften the end of the plastic tube 19. At this time, continue to rotate the flared inner body 1, and the end of the softened plastic tube 19 enters the horn section cavity. The inner heating element 6 and the outer heating element 5 around the horn section cavity are energized until the end of the plastic pipe 19 is melted, and a bell mouth of uniform thickness is expanded in the horn section cavity;
[0040] (5) After the bell mouth is cooled and shaped, disassemble the flaring device and the supporting device;
[0041] (6) Install a joint 17 at the bell mouth, connect the joint 16 and the joint 17, and press the bell mouth between the joint 16 and the joint 17;
[0042] (7) Repeat steps (1)-(6) to connect the end of the other plastic pipe with the coupling 16 and the joint 17 together;
[0043] (8) According to the distance between the two flange connecting ends, different numbers of sealing rings 18 are selected, and then the two flange connecting ends are connected together to complete the butt joint of the two plastic pipe ends.
[0044] The interface device provided by the present invention can withstand sufficiently large radial impact force and axial impact force, and has important market value in the docking of plastic pipes.
[0045] It should be understood that the purpose of these embodiments is only to illustrate the present invention and is not intended to limit the protection scope of the present invention. In addition, it should also be understood that after reading the technical content of the present invention, those skilled in the art can make various changes, modifications and/or modifications to the present invention, and all these equivalent forms also fall into the appended claims of this application. Within the limited scope of protection.
