Pipe end sealing device and pipe end sealing method

Abstract

The invention discloses a pipe end sealing device and a pipe end sealing method. The problem that in the prior art, the sealing effect of a sealing device or a sealing method on the end of a metal composite pipe is poor is solved. According to the technical scheme, the device comprises a heating module for heating the end part of a pipe; the forming module is used for shaping the end part of the heated pipe; the clamp moving module comprises a clamp module for clamping the pipe and a moving module for pushing the pipe to move towards the heating module or the forming module; and the switching module can move the heating module or the novel module, so that the end part of the pipe can be firstly heated by the heating module, and the heated end part of the pipe is in contact with the forming module for shaping.

Description

Technical Field

[0001] The invention relates to the technical field of metal composite pipe end sealing, and more specifically, to a pipe end sealing device and a pipe end sealing method. Background Art

[0002] Common metal composite pipes on the market include: steel-plastic composite pressure pipes, mesh steel strip metal composite pipes, steel skeleton metal composite pipes, wire mesh composite pipes, aluminum-plastic composite pipes, etc. Other composite pipes that may require port sealing on the market include: flexible reinforced composite pipes, etc.

[0003] Steel-plastic composite pressure pipe is a new type of pipe developed in my country in recent years. Steel-plastic composite pressure pipe is a new type of metal and plastic composite pipe, with welded steel pipe as the middle layer, inner and outer layers of polyolefin material, using special hot melt adhesive, and extrusion molding method to composite into one pipe. It is mainly used in public buildings, residential water supply pipelines, urban water supply pipeline systems, gas transmission systems, petroleum, chemical, pharmaceutical, food, mining and other fields; The perforated steel strip composite pipe is a composite pipe with a perforated steel strip welded with cold-rolled steel strip as a reinforcement frame and composite thermoplastic plastic. Due to the introduction of the reinforcement frame, the compressive strength of the pipe is significantly improved. It is mainly used in water supply, buried gas, hot water, chemical industry and special categories of uses; Steel skeleton reinforced plastic composite pipe is a new type of pressure-resistant pipe that is formed by extrusion and composite molding with a welded mesh steel wire skeleton as the reinforcement and thermoplastic plastic as the continuous base material. It is mainly used in the fields of petroleum, natural gas, chemical industry, municipal administration, communication, and shipbuilding as medium-pressure pipelines, submarine laying pipelines, and electric (optical) cable conduits. Outstanding features: The pipe has high strength, rigidity, and impact resistance; Steel wire mesh skeleton plastic composite pipe, also known as SRTP pipe, is a new type of improved steel skeleton plastic composite pipe. Because the high-strength steel wire reinforcement is coated in continuous thermoplastic plastic, this composite pipe overcomes the shortcomings of steel pipe and plastic pipe, while maintaining the advantages of steel pipe and plastic pipe. It is mainly used in oil fields, power plants, chemical and petrochemical enterprises, water companies, municipal gas, seawater pipelines and other fields.

[0004] Flexible reinforced thermoplastic composite pipe (Reinforced Thermoplastic Pipes, referred to as RTP pipe), is a high-pressure plastic composite pipe with good flexibility, corrosion resistance, high pressure resistance, impact resistance, wear resistance, light weight, easy connection, coiling, long-distance joint-free rapid laying and other characteristics. It can well overcome the corrosion problem of steel pipes and the pressure resistance problem of plastic pipes. It can be used in oil and natural gas extraction, high-pressure long-distance transportation of natural gas and various pipeline fields that require higher pressure to transport media.

[0005] Compared with traditional pipes, metal composite pipes have excellent performance and are widely used. However, because metal composite pipes need to be cut into fixed and non-fixed lengths during the production process, the metal layer or the easily oxidized and easily corroded layer at the port will be exposed to the outside. After a period of time, the metal will rust and the pipe will be stratified, which will seriously affect the performance of the pipe and even cause qualified products to be directly scrapped after being stored in the factory for a period of time. The same is true for flexible reinforced composite pipes. The metal part or the easily oxidized and easily corroded part of the port is exposed to the outside. After a period of time, this part will show obvious stratification, which greatly reduces the performance of the flexible reinforced composite pipe. Therefore, it is necessary to seal the pipe port to isolate the metal layer or the easily oxidized and easily corroded layer at the end of the pipe from the outside.

[0006] Moreover, for the construction site, the pipes will be cut off according to the on-site conditions when they are in use, causing leakage of the ports. The environment on the construction site is worse than that in the production plant, which may cause the metal layer or the easily oxidized and corroded layer or the easily oxidized and corroded layer at the pipe port to separate in a short period of time, thereby affecting the performance of the pipe and increasing the cost of using the pipe. Therefore, the construction site needs to seal the pipe ports more than the production plant.

[0007] However, in the existing technology, there are mainly the following sealing methods for sealing the ends of various composite pipes: 1. Use the injection molding machine to seal the end of the pipe; 2. Use the inner and outer molds of the sealing machine to extrude and heat the inner and outer surfaces of the pipe, so that the plastic on the inner and outer surfaces of the pipe flows to the pipe port for heating and sealing; 3. Use sealing ring to seal.

[0008] The first sealing method mentioned above has high equipment cost, and the surface needs to be processed after sealing, which is inefficient and also increases labor costs. In the second method, the wall thickness of the squeezed part of the pipe end is thinned after sealing, so that the metal part or the part that is easy to oxidize and corrode at the sealing position of the composite pipe is easily exposed, resulting in sealing failure. In addition, since the wall thickness of the sealed end of the pipe is thinned, when the pipe is connected with a standard pipe or pipe fitting, a large gap will appear at the connection, which directly affects the connection and use effect of the pipe. The equipment cost of the third method is lower than that of the above two methods. The sealing rings are purchased uniformly. However, since the raw material formulas of the pipes produced by each manufacturer are different, the sealing rings are not tightly connected to the pipes during hot melt connection. After long-term storage, the sealing rings will fall off. In addition, the inner and outer welding curling edges at the sealing position of the pipe ends must be cut after sealing. Summary of the invention

[0009] The present invention overcomes the problem in the prior art that the sealing device or sealing method has poor sealing effect on the end of the metal composite pipe, and provides a pipe end sealing device, which can use the material of the pipe end itself for sealing, can effectively prevent cracking at the seal, and avoid the fusion of different materials causing the seal to be easy to crack, so that the inner and outer wall thickness of the pipe after sealing is consistent with the inner and outer wall thickness of the pipe before sealing, thereby more effectively isolating the metal part or the easily oxidized and corroded part of the pipe end from the air, and preventing the metal part or the easily oxidized and corroded part of the pipe end from affecting its own performance due to long-term leakage.

[0010] In order to solve the above technical problems, the present invention adopts the following technical solution: a pipe end sealing device, comprising: A heating module is used to heat the end of the pipe; The forming module is used to shape the ends of the heated pipes; A fixture moving module, including a fixture module for clamping the pipe and a moving module for pushing the pipe toward the heating module or the forming module; The switching module can move the heating module or the forming module so that the end of the pipe can be heated by the heating module first, and then the end of the pipe is contacted with the forming module for shaping.

[0011] In the present application, the end of the pipe is first heated to melt the plastic layer at the end of the pipe; then the end of the pipe is shaped so that the melted plastic layer at the end of the pipe can be shaped in a shaping module, and the metal part or the easily oxidized and corroded part of the end of the pipe is covered during the shaping process, so that the material of the end of the pipe is used for sealing, and the wall thickness of the material of the end of the pipe is not reduced after sealing, so that the inner and outer wall thickness of the pipe after sealing is consistent with the inner and outer wall thickness of the pipe before sealing, so as to more effectively isolate the metal part or the easily oxidized and corroded part of the end of the pipe from the air, and prevent the pipe from affecting its own performance due to long-term storage.

[0012] Preferably, the heating module includes a heating device and a buffer device; the heating device is arranged at the end of the frame; when the end of the pipe abuts against the heating device, the buffer device absorbs the impact force exerted on the heating device.

[0013] The buffer device absorbs the impact force on the heating device. When the end of the pipe abuts against the heating device, the buffer device can provide a driving force so that the heating device can maintain close abutment with the end of the pipe to heat the end of the pipe.

[0014] Preferably, the buffer device includes a fixed seat, a guide rod and a compression spring; the guide rod is slidably arranged in the fixed seat, one end of the guide rod is connected to the heating device, and both ends of the compression spring are respectively abutted against the fixed seat and the heating device.

[0015] When the end of the pipe abuts against the heating device, the abutting spring can provide a driving force, so that the heating device can maintain close abutment with the end of the pipe, thereby heating the end of the pipe.

[0016] Preferably, the forming module comprises a forming die, and a port on one side of the forming die is provided with a plurality of concentrically arranged forming ring grooves; the end of the pipe abuts against the forming ring groove for cooling and forming.

[0017] A number of concentrically arranged forming ring grooves of different specifications can be used to form the ends of pipes of different diameters by selecting the corresponding forming mold according to the sealing needs.

[0018] Preferably, the switching module includes two symmetrically arranged linear switching devices, and the forming mold includes two mutually cooperating forming templates, and the two forming templates are respectively connected to the output ends of the two linear switching devices; the two linear switching devices drive the two forming templates to separate from each other or approach each other to cooperate into a forming mold.

[0019] The correct sealing sequence of the pipe is to heat it first, and then form it after the heating is completed. Therefore, the forming module and the heating module cannot be set on the axis of the pipe at the same time. Therefore, in this embodiment, a switching module is set, which can temporarily move the heating module or the forming module away from the axis of the pipe movement, so as not to affect the normal sealing sequence of the pipe.

[0020] Preferably, the moving module comprises two cylinder rods arranged in parallel on the frame and a cylinder body slidably arranged on the cylinder rods, and the clamp module is arranged on the cylinder body.

[0021] By controlling the flow of hydraulic oil in the cylinder rod body, the cylinder body slides on the cylinder rod, thereby driving the clamp module to move along the length direction of the cylinder rod.

[0022] Preferably, the clamp module includes a lower ring seat and an upper ring seat, the lower ring seat is fixedly arranged on the cylinder rod body, and the upper ring seat cooperates with the lower ring seat; an upper ring groove is arranged on the inner ring side of the upper ring seat, and an upper ring clamp is arranged in the upper ring groove; a lower ring groove is arranged on the inner ring side of the lower ring seat, and a lower ring clamp is arranged in the lower ring groove, and the upper ring clamp and the lower ring clamp cooperate with each other to clamp the pipe.

[0023] The upper ring clamp is detachably arranged in the upper ring groove, and the lower ring clamp is also detachably arranged in the lower ring groove. Therefore, the upper ring clamp or the lower ring clamp of different diameters can be replaced to adapt to pipes of different diameters, so that pipes of different diameters can be fixed.

[0024] Preferably, a limiting module is also included, which includes a sizing inner sleeve and a sizing outer sleeve. The sizing inner sleeve and the sizing outer sleeve cooperate to form a positioning ring groove. After the end of the pipe passes through the positioning ring groove, it abuts against the forming module or the heating module.

[0025] The limit module can clamp and support the inner and outer sides of the pipe, and can effectively prevent the pipe from deforming during heating and shaping.

[0026] Preferably, it also includes a positioning module arranged on the frame, the positioning module includes a positioning lifting device and a positioning baffle, the positioning lifting device drives the positioning baffle to move in a straight line direction; before the pipe is clamped on the clamp module, the end of the pipe abuts against the positioning module; when the end of the pipe is sealed, the positioning lifting device drives the positioning baffle to be removed from the end of the pipe.

[0027] The setting of the positioning baffle can make the position of the pipe more accurate when installing the pipe, and also make the subsequent heating and shaping steps of the pipe smoother, and also ensure the quality of the pipe after sealing.

[0028] The present application also provides a pipe end sealing method, which uses the above-mentioned pipe end sealing device and also includes the following steps: Step 1: Grooving the end of the pipe so that the metal part or the part that is easy to oxidize or corrode at the end of the pipe is cut to form an annular groove at the end of the pipe; Step 2: Heat one end of the pipe where the groove is dug to melt the plastic layer; Step 3: The heated end of the pipe is abutted against the shaping ring groove, so that the end of the pipe is cooled and shaped, and the metal or easily oxidized and easily corroded layer of the pipe is coated.

[0029] In the present application, the end of the pipe is sealed by the above method, and the material of the end of the pipe can be used for sealing, and the wall thickness of the material of the end of the pipe is not reduced after sealing, so that the inner and outer wall thickness of the pipe after sealing is consistent with the inner and outer wall thickness of the pipe before sealing, thereby more effectively isolating the metal part or the easily oxidized and corroded part of the end of the pipe from the air, preventing the performance of the pipe from being affected by storage.

[0030] Compared with the prior art, the present invention has the following beneficial effects: (1) In the present application, a groove is firstly made at the end of the pipe, and then one end of the groove is melted so that the plastic layer at the end of the pipe is melted; then the end of the pipe is shaped so that the melted plastic layer at the end of the pipe can be shaped in a shaping module. During the shaping process, the metal part or the part that is easy to oxidize or corrode at the end of the pipe is covered. It can use the material of the end of the pipe itself for sealing, which can effectively prevent cracking at the seal and avoid cracking at the seal caused by the fusion of different materials. The inner and outer wall thickness of the pipe after sealing is consistent with the inner and outer wall thickness of the pipe before sealing, thereby more effectively isolating the metal part or the part that is easy to oxidize or corrode at the end of the pipe from the air, and preventing the pipe from affecting its own performance due to long-term storage.

[0031] (2) The semi-automatic sealing of the pipe in this application can improve the sealing efficiency, and the inner and outer walls of the seal do not need to be trimmed again, so the sealing effect is better and it can be more conducive to the long-term storage of the pipe; (3) The pipe end sealing device in the present application has a compact structure and is lightweight as a whole, and can be flexibly adjusted to the site of use. It has a good use effect even in a relatively harsh environment on the construction site. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a three-dimensional structural diagram of the present invention.

[0033] Figure 2 It is a three-dimensional structural diagram of the present invention when the baffle cover and the pipe are omitted.

[0034] Figure 3 It is a cross-sectional view of the present invention.

[0035] Figure 4 yes Figure 3 A partial enlarged view of the .

[0036] Figure 5 is an exploded view of the fixture module of the present invention.

[0037] Figure 6 It is a structural diagram of the molding module and the switching module of the present invention when they cooperate.

[0038] Figure 7 It is an exploded schematic diagram of the forming template of the present invention.

[0039] Figure 8 It is a schematic diagram of the structure in Example 4 of the present invention.

[0040] Fig. 9 It is a schematic diagram of the cross-sectional structure of the pipe of the present invention.

[0041] In the figure: 1, frame, 11, first mounting plate, 12, second mounting plate, 121, mounting through hole, 13, auxiliary mounting plate, 131, supporting foot, 132, sliding hole, 14, supporting shaft rod, 15, blocking cover; 2. Heating module, 21. Heating device, 22. Fixing seat, 23. Guide rod; 3. molding module, 31. lower molding template, 311. molding base, 312. semicircular plate, 313. semicircular ring groove, 314. semicircular groove, 32. upper molding template, 33. molding ring groove, 34. return spring, 35. air pump, 351. piston rod, 36. sealing rubber plug strip; 4. fixture module, 41. lower ring seat, 411. lower ring clamp, 42. upper ring seat, 421. upper ring clamp; 5. Mobile module, 51. Cylinder rod, 52. Cylinder body; 6. Switching module, 61. Lower oil cylinder, 62. Upper oil cylinder, 63. Lower fixing plate, 64. Upper fixing plate; 7. Limiting module, 71. Sizing inner sleeve, 72. Sizing outer sleeve, 73. Positioning ring groove; 8. Positioning module, 81. Lifting cylinder, 82. Positioning baffle; 9. Pipe, 91. Inner plastic layer, 92. Middle metal layer or easily oxidized or corroded layer, 93. Outer plastic layer. DETAILED DESCRIPTION

[0042] The technical solution of the present invention is further described in detail below through specific embodiments and in conjunction with the accompanying drawings: Example 1: Reference Figures 1 to 6 As shown, a pipe end sealing device comprises: Frame 1: Frame 1 mainly supports related devices; Heating module 2, heating the end of the pipe; Forming module 3, shaping the end of the heated pipe; The clamp moving module 5 includes a clamp module 4 for clamping the pipe and a moving module 5 for pushing the pipe toward the heating module 2 or the forming module 3; The switching module 6 can move the heating module 2 or the new module so that the end of the pipe can be heated by the heating module 2 first, and then the end of the pipe is contacted with the forming module 3 for shaping.

[0043] The frame 1 is provided with a first mounting plate 11 and a second mounting plate 12 at both ends along its length direction. The first mounting plate 11 is an arc-shaped mounting plate, which does not affect the placement of the pipe when the end of the pipe is sealed. The center position of the second mounting plate 12 is provided with a penetrating mounting hole 121.

[0044] In one embodiment, the moving module 5 includes two cylinder rods 51 arranged in parallel on the frame 1 and a cylinder body 52 slidably arranged on the cylinder rods 51, and the clamp module 4 is arranged on the cylinder body 52. ​​The two cylinder rods 51 are fixedly arranged on the first mounting plate 11 and the second mounting plate 12. By controlling the flow of hydraulic oil in the cylinder rod 51, the cylinder body 52 slides on the cylinder rod 51, thereby driving the clamp module 4 to move along the length direction of the cylinder rod 51.

[0045] In one embodiment, the clamp module 4 includes a lower ring seat 41 and an upper ring seat 42. The lower ring seat 41 is fixedly arranged on the cylinder rod 51 body, and the upper ring seat 42 cooperates with the lower ring seat 41. An upper ring groove is arranged on the inner ring side of the upper ring seat 42, and an upper ring clamp 421 is arranged in the upper ring groove. A lower ring groove is arranged on the inner ring side of the lower ring seat 41, and a lower ring clamp 411 is arranged in the lower ring groove. The upper ring clamp 421 cooperates with the lower ring clamp 411 to clamp the pipe.

[0046] The upper ring clamp 421 is detachably arranged in the upper ring groove, and the lower ring clamp 411 is also detachably arranged in the lower ring groove. Therefore, the upper ring clamp 421 or the lower ring clamp 411 of different diameters can be replaced to adapt to pipes of different diameters, so that pipes of different diameters can be fixed. Bolts are arranged at both ends of the lower ring seat 41, one end of the bolt is rotatably connected to the lower ring seat 41, and the other end of the bolt is matched with a nut; the upper ring seat 42 and the lower ring seat 41 are fixed at both ends by the combination of bolts and nuts. In addition, there are two groups of clamp models in the present application, and both groups of clamp models are arranged on the cylinder rod 51 body, so that the pipe can be clamped more stably.

[0047] The heating module 2 and the molding module 3 are both arranged through the second mounting plate 12 and fixedly arranged on the frame 1. The heating module 2 and the molding module 3 can also be fixedly arranged on the frame 1 through other mounting plates, and the heating module 2 and the molding module 3 in the present application are both arranged on the second mounting plate 12, so that the number of overall parts can be reduced, the overall mass can be smaller, the structure can be more compact, and thus it can be more convenient to move.

[0048] In one embodiment, the heating module 2 includes a heating device 21 and a buffer device; the heating device 21 is arranged at the end of the frame 1; when the end of the pipe abuts against the heating device 21, the buffer device absorbs the impact force on the heating device 21. The heating device 21 in this embodiment is a heating plate. In order to reduce the impact of dust or rain on the performance of the heating device 21, a shield 15 is arranged on the top of the heating plate.

[0049] The buffer device includes a fixed seat 22, a guide rod 23 and a compression spring; the guide rod 23 is slidably arranged in the fixed seat 22, one end of the guide rod 23 is connected to the heating device 21, the compression spring is sleeved on the guide rod 23, and the two ends of the compression spring are respectively abutted against the fixed seat 22 and the heating device 21.

[0050] Specifically, one end of the oil cylinder rod 51 away from the first mounting plate 11 passes through the second mounting plate 12, and the fixing seat 22 is fixedly arranged at the end of the oil cylinder rod 51 away from the first mounting plate 11, that is, the fixing seat 22 and the first mounting plate 11 are respectively located on both sides of the second mounting plate 12. The two ends of the fixing seat 22 in the length direction are respectively fixedly arranged on the two oil cylinder rods 51. In order to make the heating device 21 move more stably along the guide rod 23, two guide rods 23 are provided in the present application, that is, two groups of buffer devices are provided. That is, the two guide rods 23 are arranged along the length direction of the fixing seat 22, and when the end of the pipe abuts against the heating device 21, the stability is higher. And when the end of the pipe abuts against the heating device 21, the abutting spring can provide a driving force, so that the heating device 21 can maintain a close abutment with the end of the pipe to heat the end of the pipe.

[0051] In one embodiment, the molding module 3 includes a molding die, and a port on one side of the molding die is provided with a plurality of concentrically arranged molding annular grooves 33; the number of the molding annular grooves 33 can be set to one, or can be set to a plurality of concentrically arranged molding annular grooves 33. In the embodiment of this city, a plurality of molding annular grooves 33 are provided. After the end of the pipe is heated, the end of the pipe abuts against the molding annular groove 33 to be cooled and formed. The molding annular groove 33 is provided on the side of the molding die facing the first mounting plate 11. A plurality of concentrically arranged molding annular grooves 33 can adapt to pipes of different diameters, so that the ends of pipes of different diameters can be molded without changing the molding die.

[0052] The forming mold in this embodiment is arranged on a side of the second mounting plate 12 close to the first mounting plate 11 .

[0053] The correct sealing sequence of the pipe is to heat it first and then form it after the heating is completed. Therefore, the forming module 3 and the heating module 2 cannot be set on the axis of the pipe at the same time. Therefore, in this embodiment, a switching module 6 is set, which can temporarily move the heating module 2 or the forming module 3 away from the axis of the pipe movement, so as not to affect the normal sealing sequence of the pipe.

[0054] In one embodiment, the switching module 6 includes two symmetrically arranged linear switching devices, and the molding mold includes two molding templates that cooperate with each other. The two molding templates are respectively connected to the output ends of the two linear switching devices; the two linear switching devices drive the two molding templates to separate from each other or approach each other to cooperate to form a molding mold.

[0055] The linear switching device in this embodiment is a cylinder, and the linear switching device includes but is not limited to a cylinder. The two linear switching devices in this application are arranged in the vertical direction, and are respectively an upper cylinder 62 and a lower cylinder 61. The two forming templates are semicircular, and the two forming templates are respectively an upper forming template 32 and a lower forming template 31, the lower forming template 31 is connected to the output end of the lower cylinder 61, and the upper forming template 32 is connected to the output end of the upper cylinder 62.

[0056] An upper fixing plate 64 is arranged above the second mounting plate 12, the upper fixing plate 64 is fixedly arranged on the top of the second mounting plate 12 by means of pillars, and the upper oil cylinder 62 is fixedly arranged on the upper fixing plate 64. A lower fixing plate 63 is arranged below the second mounting plate 12, the lower fixing plate 63 is fixedly arranged below the second mounting plate 12 by means of pillars, and the lower oil cylinder 61 is fixedly arranged on the lower fixing plate 63.

[0057] When the pipe needs to be heated, the output end of the upper oil cylinder 62 drives the upper forming template 32 to move upward, and the output end of the lower oil cylinder 61 drives the lower forming template 31 to move downward, so that the two forming templates are separated from each other, so that the pipe can pass between the upper forming template 32 and the lower forming template 31, and then abut against the heating device 21.

[0058] In order to make the upper molding template 32 and the lower molding template 31 move more stably in the vertical direction, an auxiliary mounting plate 13 is provided on the side of the second mounting plate 12 close to the first mounting plate 11 in the present application. The auxiliary mounting plate 13 is provided with supporting feet 131 protruding toward the port direction at both ends in the horizontal direction. The supporting feet 131 and the second mounting plate 12 are fixedly connected by bolts, so that a sliding hole 132 is formed between the auxiliary mounting plate 13 and the second mounting plate 12. The cross section of the sliding hole 132 in this embodiment is square. The upper molding template 32 and the lower molding template 31 slide along the sliding hole 132, so that the upper molding template 32 and the lower molding template 31 move more stably in the vertical direction.

[0059] The working principle of this application is as follows, which mainly includes the following steps: Step 1: Grooving the port of the pipe to be sealed, so that the metal part or the part that is easy to oxidize or corrode at the port of the pipe is cut off by a certain length, and a ring groove is formed at the port of the pipe; Step 2, fix the pipe on the fixture module 4, and the grooved end of the pipe faces the forming module 3 or the heating module 2; Step 3, start the pipe end sealing device, the moving module 5 drives the clamping module 4 to move the pipe toward the heating module 2, at this time, the upper forming template 32 and the lower forming template 31 are separated, the pipe passes through the upper forming template 32 and the lower forming template 31, after the pipe abuts against the heating module 2, the heating module 2 heats the end of the pipe, after the end of the pipe is heated for a period of time, the moving module 5 drives the pipe to move to a specified position in the direction away from the heating module 2; Step 4, the lower oil cylinder 61 and the upper oil cylinder 62 respectively drive the lower forming template 31 and the upper forming template 32 to move closer to each other, and the lower forming template 31 and the upper forming template 32 move closer to each other and combine into a complete forming template; Step 5, the moving module 5 drives the pipe to move toward the direction close to the forming template, and the end of the pipe abuts against the forming ring groove 33. The plastic layer after heating and melting at the end of the pipe covers the metal layer or the easily oxidized and easily corroded layer in the forming ring groove 33; Step 6: After the end of the pipe is cooled and formed, the moving module 5 drives the pipe to move away from the forming template, and the moving module 5, the heating module 2 and the forming module 3 move to the initial position, the pipe is taken out, and the sealing of the end of the pipe is completed.

[0060] In the present application, the end of the pipe is first melted so that the plastic layer at the end of the pipe is melted; then the end of the pipe is shaped so that the melted plastic layer at the end of the pipe can be shaped in a shaping module, and the metal part or the easily oxidized and corroded part of the end of the pipe is covered during the shaping process, so that the material of the end of the pipe is used for sealing, and the wall thickness of the material of the end of the pipe is not reduced after sealing, so that the inner and outer wall thickness of the pipe after sealing is consistent with the inner and outer wall thickness of the pipe before sealing, thereby more effectively isolating the metal part or the easily oxidized and corroded part of the end of the pipe from the air, and preventing the performance of the pipe itself from being affected by storage.

[0061] In the above-mentioned sealing device, the present invention adopts a grooving process.

[0062] Technical background: The present invention adopts the process of first digging a groove and then sealing the port. At present, the pipes used in other fields on the market adopt the outer wall clamping method to process the port, and the port processing device is fixed, and the port processing accuracy requirements are not high, and it is only used for ordinary conventional pipe port processing; some also adopt internal support blocks to tighten the inner wall of the pipe, thereby fixing the port processing device, but this method is relatively suitable for pipes with relatively high hardness and not easy to deform, and the contact between the inner support block and the inner wall of the pipe is in the form of line contact, which is easy to produce indentations on the inner wall; but for metal composite pipes or flexible reinforced composite pipes, since the pipe itself has relatively poor rigidity, relatively high requirements on the inner and outer surfaces, large ellipticity of the pipe, and thin pipe wall, the above scheme cannot meet the requirements for fixing the port processing tool of metal composite pipes or flexible reinforced composite pipes.

[0063] The present invention adopts a method of internally supporting the inner wall of the pipe, and adopts an internal support tile structure, so that the outer wall of the internal support tile is fully in contact with the inner wall of the pipe, which can effectively increase the contact area and is in the form of surface contact; in the process of tightening the inner wall of the pipe, the ovality of the pipe can be corrected, which is convenient for grooving the end of the pipe, and there will be no indentation on the inner wall of the pipe; Taking into account the problem of uneven pipe ends due to the influence of the cutting machine during the production of metal composite pipes or flexible reinforced composite pipes, the present invention adopts a process of simultaneous grooving and flattening. While the metal part or the part that is easily oxidized and corroded is grooved along the rotation center, the pipe end will also be flattened as the grooving knife feeds.

[0064] The trenching process of the present invention is specifically as follows: 1. Select the corresponding cutter disc (the cutter disc contains a cutter block and a blade adjustment device) according to the pipe specifications and install it in the corresponding installation position of the grooving tool; 2. Select the corresponding inner support tile according to the pipe specification. One specification contains 3 or more inner support tiles. Install the inner support tiles at the corresponding installation positions of the grooving tool. Adjust the position of the inner support tile to minimize the inner support tile and insert it to a certain distance along the axial direction of the pipe. 3. Adjust the position of the inner support tile to expand it as much as possible until it tightens the inner wall of the pipe; 4. Use the adjustment device on the cutter disc to align the blades of the groove cutter and flat-edge cutter with the metal part or the part that is easily oxidized or corroded or the port that is easily oxidized or corroded, and lock the cutter to ensure effective removal of the metal part or the part that is easily oxidized or corroded or the port that is easily oxidized or corroded.

[0065] 5. Start the power supply, adjust the feed speed of the tool according to the process requirements, and level the pipe end.

[0066] Example 2: Reference Figures 1 to 7As shown, the structure of this embodiment is similar to that of the embodiment 1, except that it further includes a limit module 7, which can clamp and support the inner and outer sides of the pipe, and can effectively prevent the pipe from deforming during heating and shaping. The limit module 7 is arranged on one side of the heating module 2 close to the first mounting plate 11.

[0067] The limiting module 7 in this embodiment includes a sizing inner sleeve 71 and a sizing outer sleeve 72 , which cooperate to form a positioning ring groove 73 , and the end of the pipe passes through the positioning ring groove 73 and abuts against the forming module 3 or the heating module 2 .

[0068] Specifically, the sizing outer sheath 72 is fixedly arranged on the auxiliary mounting plate 13. A support shaft 14 is arranged in the middle position of the fixing seat 22, and the support shaft 14 corresponds to the axis position of the pipe. The support shaft 14 passes through the heating plate and the shaping mold and is connected to the sizing inner sheath 71, and the sizing inner sheath 71 is fixedly arranged on the support shaft 14.

[0069] Example 3: Reference Figures 1 to 7 As shown, the structure of this embodiment is similar to that of Embodiment 1 or Embodiment 2, except that it further includes a positioning module 8 disposed on the frame 1 , and the positioning module 8 is disposed between the limiting module 7 and the first mounting plate 11 .

[0070] The positioning module 8 includes a positioning lifting device and a positioning baffle 82. The positioning lifting device drives the positioning baffle 82 to move in a straight line direction. Before the pipe is clamped in the clamp module 4, the end of the pipe abuts against the positioning module 8. When the end of the pipe is sealed, the positioning lifting device drives the positioning baffle 82 to be removed from the end of the pipe. The positioning lifting device in the present application is a lifting cylinder 81. The positioning lifting device in the present application includes but is not limited to a lifting cylinder 81. The lifting cylinder 81 is fixedly arranged on the lower fixed plate 63.

[0071] By setting the positioning baffle 82, when clamping the pipe, the lifting cylinder 81 drives the positioning baffle 82 to move upward, so that the positioning baffle 82 is located at the axial position of the pipe, and the end of the pipe with the groove is first abutted against the positioning baffle 82, and then the pipe is fixed by the clamp module 4. Later, when the pipe is sealed, the lifting cylinder 81 drives the positioning baffle 82 to move downward, so that the pipe can smoothly abut against the heating device 21. Therefore, the setting of the positioning baffle 82 can make the position of the pipe more accurate when installing the pipe, and also make the subsequent heating and shaping steps of the pipe smoother, and also ensure the quality of the pipe after sealing.

[0072] Example 4: Reference Figure 8As shown, the structure of this embodiment is similar to that of Embodiment 1 or Embodiment 2 or Embodiment 3, except that the molding template includes a molding base 311 and a semicircular plate 312, and a plurality of semicircular annular grooves 313 are concentrically arranged on the semicircular plate 312. When the two molding templates cooperate with each other, the semicircular annular grooves 313 on the two semicircular plates 312 cooperate to form a molding annular groove 33.

[0073] A semicircular groove 314 is provided on the molding base 311 to match the semicircular plate 312, and the semicircular plate 312 is installed in the semicircular groove 314. A return spring 34 is abutted between the molding base 311 and the semicircular groove 314, and an air pump 35 is provided between the semicircular groove 314 and the molding template. The air pump 35 is fixed in the semicircular ring, and the piston rod 351 of the air pump 35 abuts against the molding template. Side wall ring grooves are provided on the side walls on both sides of the semicircular ring groove 313, and a hollow sealing rubber strip 36 is provided in the side wall ring groove. The sealing rubber strip 36 is connected to the air outlet of the air pump 35 through an air pipe.

[0074] In this embodiment, only one semicircular groove 314 is disposed in the semicircular plate 312 .

[0075] In the present application, in the initial state, the semicircular plate 312 and the semicircular groove 314 are provided with a gap by the action of the return spring 34. At this time, the air pump 35 is in the initial state. At this time, the sealing rubber strip 36 just fills the side wall groove, so that the side walls on both sides of the semicircular groove 313 remain flat. When the end of the pipe is in contact with the forming groove 33 for shaping, the pipe acts on the semicircular plate 312, so that the semicircular plate 312 overcomes the return spring 34. The force of the piston rod 351 moves in the direction of fitting with the semicircular groove 314, and the gas in the air pump 35 enters the sealing rubber strip 36 through the air pipe, so that the sealing rubber strip 36 expands, and the sealing rubber strip 36 is tightly fitted to the inner and outer side walls of the pipe, thereby preventing the melted plastic from penetrating from the pipe and the side wall of the semicircular groove 313 when the pipe is shaped, thereby ensuring the sealing quality of the pipe end. At the same time, it also allows the end of the pipe to withstand greater pressure when it is shaped in the shaping ring groove, so that the melted plastic can be better re-fused in the shaping ring groove.

[0076] Embodiment 5: A method for sealing the end of a pipe, using the pipe end sealing device described in any one of Embodiments 1 to 5, further comprising the following steps; Step 1: Grooving the end of the pipe so that the metal part or the part that is easy to oxidize or corrode at the end of the pipe is cut to form an annular groove at the end of the pipe; Step 2: Heat one end of the pipe where the groove is dug to melt the plastic layer; Step 3: The heated end of the pipe is brought into contact with the shaping ring groove, so that the end of the pipe is cooled and shaped, and the metal layer or the easily oxidized and easily corroded layer of the pipe is covered.

[0077] In step 1, the end of the pipe is grooved so that the metal part or the easily oxidized and easily corroded part of the pipe end is cut, an annular groove is formed at the end of the pipe, and the middle metal layer or the easily oxidized and easily corroded layer in the annular groove is cut.

[0078] In step 2, the following steps are also included: Fix the pipe on the fixture module 4, with the grooved end of the pipe facing the forming module 3 or the heating module 2; Start the pipe end sealing device, the moving module 5 drives the clamping module 4 to move the pipe toward the heating module 2. After the pipe abuts against the heating module 2, the heating module 2 heats the end of the pipe. After the end of the pipe is heated for a period of time, the moving module 5 drives the pipe to move to a specified position in the direction away from the heating module 2.

[0079] In step 3, the following steps are also included: The switching module 6 drives the forming module 3 to move, so that the forming module 3 is located in the axial direction of the pipe; The moving module 5 drives the pipe to move towards the shaping module, and the end of the pipe abuts against the shaping module. The plastic layer after heating and melting at the end of the pipe covers the metal layer or the easily oxidized and easily corroded layer on the shaping module. After the end of the tube is cooled and formed, the moving module 5 drives the tube to move away from the forming module 3, and the moving module 5, the heating module 2 and the forming module 3 move to the initial position, the tube is taken out, and the sealing of the end of the tube is completed.

[0080] like Fig. 9 As shown, the pipe 9 includes an inner plastic layer 91, an outer plastic layer 93 and an intermediate metal layer or an easily oxidized and easily corroded layer 92; the intermediate metal layer or the easily oxidized and easily corroded layer is arranged between the inner plastic layer and the outer plastic layer.

[0081] In the present application, a groove is firstly dug at the end of the pipe, and then one end of the groove is heated to melt the plastic layer at the end of the pipe; then the end of the pipe is shaped, so that the melted plastic layer at the end of the pipe can be shaped in a shaping module, and the metal part or the part that is easy to oxidize or corrode at the end of the pipe is covered during the shaping process, so that the material of the end of the pipe is used for sealing, and the wall thickness of the material of the end of the pipe is not reduced after sealing, so that the inner and outer wall thickness of the pipe after sealing is consistent with the inner and outer wall thickness of the pipe before sealing, so that the metal part or the part that is easy to oxidize or corrode at the end of the pipe is more effectively isolated from the air, and the performance of the pipe itself is prevented from being affected by storage.

[0082] The above-described embodiments are only preferred solutions of the present invention and are not intended to limit the present invention in any form. Other variations and modifications are possible without exceeding the technical solutions described in the claims.

Claims

1. A pipe end sealing device, characterized in that: include: A heating module is used to heat the end of the pipe; The forming module is used to shape the ends of the heated pipes; A fixture moving module, including a fixture module for clamping the pipe and a moving module for pushing the pipe toward the heating module or the forming module; The switching module can move the heating module or the new module so that the end of the pipe can be heated by the heating module first, and then the end of the pipe is contacted with the forming module for shaping.

2. The pipe end sealing device according to claim 1, characterized in that: The heating module comprises a heating device and a buffer device; the heating device is arranged at the end of the frame; when the end of the pipe abuts against the heating device, the buffer device absorbs the impact force on the heating device.

3. The pipe end sealing device according to claim 2, characterized in that: The buffer device comprises a fixed seat, a guide rod and a compression spring; the guide rod is slidably arranged in the fixed seat, one end of the guide rod is connected to the heating device, and the two ends of the compression spring are respectively abutted against the fixed seat and the heating device.

4. The pipe end sealing device according to claim 1, characterized in that: The forming module comprises a forming die, and the end surface of one side of the forming die is provided with a plurality of concentrically arranged forming ring grooves; the end of the pipe material abuts against the forming ring groove for cooling and forming.

5. The pipe end sealing device according to claim 4, characterized in that: The switching module includes two symmetrically arranged linear switching devices, and the forming mold includes two mutually cooperating forming templates, which are respectively connected to the output ends of the two linear switching devices; the two linear switching devices drive the two forming templates to separate from each other or approach each other to form a forming mold.

6. The pipe end sealing device according to claim 1, characterized in that: The moving module comprises two cylinder rods arranged in parallel on the frame and a cylinder body arranged slidably on the cylinder rods, and the clamp module is arranged on the cylinder body.

7. The pipe end sealing device according to claim 6, characterized in that: The clamp module includes a lower ring seat and an upper ring seat. The lower ring seat is fixedly arranged on the cylinder rod body, and the upper ring seat cooperates with the lower ring seat. An upper ring groove is arranged on the inner ring side of the upper ring seat, and an upper ring clamp is arranged in the upper ring groove. A lower ring groove is arranged on the inner ring side of the lower ring seat, and a lower ring clamp is arranged in the lower ring groove. The upper ring clamp and the lower ring clamp cooperate with each other to clamp the pipe.

8. The pipe end sealing device according to any one of claims 1 to 7, characterized in that: It also includes a limiting module, which includes an inner sheath and an outer sheath. The inner sheath and the outer sheath cooperate to form a positioning ring groove. After the end of the pipe passes through the positioning ring groove, it abuts against the forming module or the heating module.

9. The pipe end sealing device according to any one of claims 1 to 7, characterized in that: It also includes a positioning module arranged on the frame, the positioning module includes a positioning lifting device and a positioning baffle, the positioning lifting device drives the positioning baffle to move in a straight line direction; before the pipe is clamped on the clamp module, the end of the pipe abuts against the positioning module; when the end of the pipe is sealed, the positioning lifting device drives the positioning baffle to be removed from the end of the pipe.

10. A method for sealing the end of a pipe, characterized in that: Using the pipe end sealing device as described in any one of claims 1 to 9, further comprising the following steps; Step 1: Grooving the end face of the pipe so that the metal part of the end face of the pipe is cut to form an annular groove on the end face of the pipe; Step 2: Heat one end of the pipe where the groove is dug to melt the plastic layer; Step 3: The heated end of the pipe is placed in contact with the shaping ring groove, so that the end of the pipe is cooled and shaped, and the metal layer of the pipe is coated.

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