Plastic packaging device for pipeline end

Abstract

The invention relates to the technical field of pipeline machining, in particular to a pipeline end plastic packaging device which comprises a heater for heating a pipeline end and further comprises a pusher, a stretching die and a shaping die, the pusher is used for driving a pipeline to move in the axial direction, the stretching die is used for being inserted into the pipeline and can move in the axial direction, and the shaping die is used for shaping the pipeline end. The stock mold is installed at the output end of the driver, the driver is used for driving the stock mold to be switched between a working position and a non-working position, a shaping ring groove is formed in the stock mold, the shaping ring groove is coaxial with the pipeline when located at the working position, and the end of the pipeline can be inserted into the shaping ring groove. The scheme is used for solving the problems of high trimming time consumption and high requirement on the technical level of workers of the existing pipeline end plastic seal.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline processing, and in particular to a pipeline end plastic sealing device. Background Art

[0002] The pipes that need to be plastic-sealed at the ends are often composite pipes with metal wire wrapped inside. The metal wire mesh of such composite pipes is distributed in the matrix of thermoplastic plastics, and is gradually replacing traditional steel pipes with its high strength and lightweight characteristics. Such composite pipes need to be cut into the required length after production, but after cutting, the metal wire is inevitably exposed at the end of the pipe.

[0003] In order to prevent the exposed metal wire at the end from being corroded / rusted by liquid or gas and to extend the service life of the composite pipe, a sealing ring is usually used to seal the end face of the composite pipe. Specifically, the sealing ring is made of a thermoplastic material and is spliced ​​to the end of the composite pipe by hot melting, so that the sealing ring can isolate the metal wire at the end of the pipe from the outside world.

[0004] For example, the Chinese patent announcement number with the application date of 2023 is CN219236152U "Sealing device for composite pipe" and CN218719409U "Connection structure for composite pipe sealing". This method is the above-mentioned method of hot-melting the sealing ring and the pipe end to form an integral whole. In order to ensure the quality after the docking, it is often necessary to make a groove on the sealing ring, and then form a convex or conical shape on the pipe end, and then match the sealing ring with the pipe end, and finally connect the two together under the softening of the material. However, the current operation has the following problems:

[0005] After the sealing ring is butt-jointed with the pipe, it is connected by hot-melt extrusion. During the cooling process, both the inner and outer surfaces of the pipe will produce excess welding material. At this time, the excess material on the inner and outer surfaces of the pipe needs to be trimmed. The trimming process must not only avoid damaging the pipe itself, but also ensure the appearance quality of the pipe. This process is not only time-consuming and labor-intensive, but also requires a high level of technical skills from the workers. Summary of the invention

[0006] The present invention aims to provide a pipe end plastic sealing device to solve the problem that the current pipe end plastic sealing has the problem of time-consuming trimming and high technical requirements on workers.

[0007] In order to achieve the above object, the present invention adopts the following technical scheme:

[0008] The pipe end plastic sealing device includes a heater for heating the pipe end, a pusher, a stretching die and a shaping die. The pusher is used to drive the pipe to move axially. The stretching die is used to be inserted into the pipe. The stretching die can move axially. The shaping die is installed at the output end of the driver. The driver is used to drive the shaping die to switch between the working position and the non-working position. The shaping die is provided with a shaping ring groove. When the shaping ring groove is in the working position, it is coaxial with the pipe. The pipe end can be inserted into the shaping ring groove.

[0009] The principle and advantage of this scheme are: when the pipe end is plastic-sealed by this scheme, the previous sealing ring method is no longer used. Instead, the pipe end is first heated by a heater to soften the pipe end material, and then the pipe end is controlled to move relative to the heater by a pusher so that the pipe end and the heater generate an extrusion force, and the metal wire in the pipe will be compressed inward under the extrusion; then the stretching die is moved outward from the inside of the pipe to pull the softened material outward, and after the softened material is pulled out, the metal wire is compressed inward in the previous step, thereby ensuring that the metal wire is basically trapped in the softened plastic material after the softened material is pulled out; finally, the driver is used to drive the shaping die to move to the working position, and the pusher drives the pipe to move toward the shaping die until the pipe end is inserted into the shaping ring groove of the shaping die, and the pulled softened material will be accumulated on the pipe end, thereby ensuring that the metal wire will not be exposed, and the shaping is completed, and the plastic sealing of the pipe end is completed, and then the pipe is controlled to be pulled out of the shaping die to complete the plastic sealing of the pipe end. In the whole scheme, the pipe is no longer sealed with a sealing ring. Instead, the pusher, heater, stretching die and shaping die cooperate to realize automatic and efficient pipe end sealing. The sealing process not only saves the material of the sealing ring, but also avoids the welding between the sealing ring and the pipe end. The pipe end is reshaped under the shaping ring groove of the shaping die, so there is no need to trim the inner and outer surfaces after sealing, which greatly reduces the time consumed for sealing the end. In addition, when no repair is required, there is no problem of high technical ability requirements for workers, thereby greatly reducing labor costs.

[0010] Preferably, as an improvement, the inner side wall of the shaping ring groove is conical, and the conical surface of the shaping ring groove can be against the softened inner wall of the pipe end. Because the metal wire is often located in the middle or outside of the pipe wall thickness, when the shaping ring groove of the conical surface shapes the softened and pulled out pipe plastic, it can force the softened and pulled out material not to be completely axially back-pressed, but to move outside the pipe under the resistance of the conical surface and the inner wall of the pipe, thereby increasing the thickness of the plastic material at the front end of the metal mesh, further ensuring that the metal mesh is completely immersed in the pipe, and completely avoiding the exposure of the metal wire.

[0011] In addition, the design of the inner conical surface of the shaping ring groove makes the inner hole of the pipe trumpet-shaped at the end, thereby basically ensuring the smoothness of the inner hole of the pipe after shaping. The plastic sealing is completed in one shaping without the need for subsequent grinding and trimming, and the trumpet-shaped inner hole is convenient for the subsequent splicing between pipes.

[0012] Preferably, as an improvement, there are multiple shaping ring grooves to facilitate the plastic sealing molding of multiple models of pipe ends.

[0013] Preferably, as an improvement, the molding die includes a template and a molding ring detachably connected to the template, and the molding ring groove is arranged on the molding ring. This solution enables the molding ring to be directly replaced when the molding ring groove is damaged or the specification needs to be changed, thereby reducing the replacement and maintenance costs, improving practicality, and facilitating the plastic sealing of the end caps of pipes of more specifications.

[0014] Preferably, as an improvement, the heater is an annular heating plate, and the movable axis of the stretching die passes through the annular center of the heating plate, so that after heating is completed, the softened material can be quickly stretched outward, which helps to improve the efficiency of plastic sealing.

[0015] Preferably, as an improvement, the heating plate is mounted on a frame, and an elastic member is provided between the heating plate and the frame.

[0016] Beneficial effect: When adopting this scheme, an elastic member is arranged between the heating plate and the frame. On the one hand, when the pusher pushes the pipe against the heating plate, there will be no hard collision, thus reducing the difficulty of controlling the pusher to push the pipe; on the other hand, when there is an extrusion force between the pusher pushing the pipe and the heating plate, after the thermoplastic material at the end of the pipe softens, the heating plate will automatically push the heating plate to extrude the pipe under the elastic force of the elastic member, thereby pressing the metal wire into the pipe, ensuring that the plastic sealing process not only shapes the softened material on the inner wall of the pipe outward and forward to increase the thickness of the thermoplastic material at the front end of the metal wire, but also allows the metal wire to move into the pipe, thereby further increasing the thickness of the plastic sealing material at the front end of the metal wire after the plastic sealing is completed. In addition, the presence of the elastic member also makes a certain distance between the heating plate and the frame, which can reduce the efficiency of the heat transfer from the heating plate to the frame, thereby ensuring that the frame is not overheated.

[0017] Preferably, as an improvement, the shaping die is located between the pusher and the heater, and the shaping die is connected to a fixed seat along the radial sliding direction of the pipeline, and a through hole is provided on the fixed seat, the size of the through hole is larger than the size of the pipeline, and both the pipeline and the stretching die can pass through the through hole.

[0018] Preferably, as an improvement, it also includes a clamp, the clamp includes a first clamping shoe and a second clamping shoe that can clamp the pipe, at least one of the first clamping shoe and the second clamping shoe can move radially along the pipe, after the first clamping shoe and the second clamping shoe clamp the pipe, the central axis of the pipe coincides with the central axis of the shaping ring groove, and the clamp with the first clamping shoe and the second clamping shoe is used to clamp the pipe from the outer periphery of the pipe, so as to ensure that the position of the pipe does not change during the shaping process.

[0019] Preferably, as an improvement, the first clamping shoe and the second clamping shoe both include a shoe seat and an arc-shaped clamping plate detachably connected to the shoe seat. This solution enables the clamping of a pipeline of a new specification to be performed by only replacing the arc-shaped clamping plate after the outer diameter of the pipeline changes.

[0020] Preferably, as an improvement, the pusher is a double-rod oil cylinder / double-rod air cylinder, the pusher is a pusher with a fixed piston rod and a movable cylinder body, the clamp is fixed on the cylinder body of the pusher, and the bidirectional piston rod of the pusher is parallel to the axis of the pipeline. When this solution is adopted, the pusher not only plays a role in pushing the pipeline, but also makes the pipeline move smoothly through the double-rod piston rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of a three-dimensional structure of an embodiment of the present invention.

[0022] Figure 2 for Figure 1 main view.

[0023] Figure 3 for Figure 1 Schematic diagram of the 3D structure after placing the pipes.

[0024] Figure 4 for Figure 3 Front cross-sectional view.

[0025] Figure 5 for Figure 4 A partial enlarged schematic diagram in FIG. 1 (in this state, the pipe is against the heating plate and the stretching die is located inside the pipe).

[0026] Figure 6 It is a schematic diagram of the three-dimensional structure when the shaping mold moves downward to the working position to shape the pipe end according to an embodiment of the present invention.

[0027] Figure 7 for Figure 6 Front cross-sectional view.

[0028] Figure 8 for Figure 7 A partial enlarged schematic diagram in FIG. 1 (in this state, the shaping ring groove shapes the pipe end). DETAILED DESCRIPTION

[0029] The following is further described in detail through specific implementation methods:

[0030] The figure marks in the drawings of the specification include: a conveying roller group 10, a lower conveying roller 11, an upper conveying roller 12, a first lifter 13, a lifting plate 14, a pusher 20, a piston rod 21, a cylinder body 22, a clamper 30, a first clamping shoe 31, a second clamping shoe 32, an arc clamping plate 311, a guide rod 33, a second lifter 34, a shaping die 40, a shaping ring 41, a shaping ring groove 411, a driver 42, a fixing seat 43, a stretching die 50, a linear driver 51, a heating plate 60, an elastic member 61, a fixing plate 62, a frame 100, a pipeline 200, and a metal wire 201.

[0031] The embodiment is basically as shown in the attached Figures 1 to 8 shown.

[0032] The pipe end plastic sealing device comprises a conveying roller set 10, a pusher 20, a clamper 30, a shaping die 40, a stretching die 50 and a heater 60. The conveying roller set 10, the clamper 30, the shaping die 40 and the heater are sequentially arranged along the axial direction of the pipe 200.

[0033] The conveying roller group 10 includes at least two lower conveying rollers 11 and at least two upper conveying rollers 12. The lower conveying roller 11 is rotatably connected to the frame 100. The conveying roller group 10 is powered, and the lower transmission roller can rotate freely under external force. The upper conveying roller 12 is installed on a lifting plate 14 installed at the output end of the first lifter 13 (the first lifter 13 is fixed on the frame 100). When the pipeline 200 is placed on the lower conveying roller 11, the first lifter 13 drives the lifting plate 14 downward until the upper conveying roller 12 is against the surface of the pipeline 200, and then drives the pipeline 200 for transportation under the power of the conveying roller group 10; specifically, the power of the conveying roller group 10 of this embodiment is used to drive the upper conveying roller 12 to rotate.

[0034] The pusher 20 is a double-rod oil cylinder / double-rod air cylinder. The pusher 20 of this embodiment is a double-rod oil cylinder. There are two pushers 20. The two pushers 20 are symmetrically arranged about the axial direction of the pipeline 200, and the bidirectional piston rod 21 of the pusher 20 is parallel to the axial direction of the pipeline 200. The pusher 20 is a pusher 20 in which the piston rod 21 is fixedly installed and the cylinder body 22 moves along the piston rod 21. The piston rod 21 of this embodiment is fixed on the frame 100.

[0035] The clamp 30 is fixed on the cylinder 22 of the pusher 20. The clamp 30 includes two groups of clamping shoes. Each group of clamping shoes includes a first clamping shoe 31 and a second clamping shoe 32 that can clamp the pipe 200. The first clamping shoe 31 and the second clamping shoe 32 both include a shoe seat and an arc-shaped clamping plate 311 detachably connected to the shoe seat. The shoe seat of the first clamping shoe 31 is fixedly connected to the cylinder 22 of the pusher 20. A guide rod 33 is fixed on the shoe seat of the first clamping shoe 31. The shoe seat of the second clamping shoe 32 is vertically slidably connected to the guide rod 33. The second clamping shoe 32 can move vertically along the guide rod 33 under the lift of the second lifter 34. The arc-shaped clamping plates 311 of the first clamping shoe 31 and the second clamping shoe 32 can clamp the pipe 200 from the upper and lower positions of the pipe 200. After the clamper clamps the pipe 200, the central axis of the pipe 200 coincides with the central axis of the shaping ring groove 411. Specifically, there are multiple guide rods 33 , a support plate is fixedly mounted on the top of the guide rods 33 , and the second lifter 34 is fixed on the support plate.

[0036] The pusher 20 is formed integrally with the clamper 30 so as to be able to clamp the pipe 200 for axial movement.

[0037] The shaping mold 40 is connected to the output end of the driver 42, and the driver 42 is used to drive the shaping mold 40 to switch between the working position and the non-working position.

[0038] The shaping mold 40 includes a template and a shaping ring 41 detachably connected to the template, and a shaping ring groove 411 is provided on the shaping ring 41. There are multiple shaping ring grooves 411, and the multiple shaping ring grooves 411 are concentric, so that it is convenient to select a suitable shaping ring groove 411 according to the specifications of the pipeline 200. When the shaping ring groove 411 is located at the working position, the shaping ring groove 411 is coaxial with the pipeline 200, and the end of the pipeline 200 can be inserted into the shaping ring groove 411 for shaping under the push of the pusher 20.

[0039] The inner side wall of each shaping ring groove 411 is conical, and the conical surface makes the size of the shaping ring groove 411 at the opening the largest. The conical surface of the opening of each shaping ring groove 411 can be against the softened inner wall of the end of the pipe 200.

[0040] The shaping die 40 is located between the pusher 20 and the heater, and a fixing seat 43 is fixed on the frame 100. The shaping die 40 is connected to the fixing seat 43 along the radial sliding of the pipe 200. In this embodiment, the shaping die 40 can be lifted and lowered along the fixing seat 43 under the action of the driver 42. A through hole is opened on the fixing seat 43, and the size of the through hole is larger than the size of the pipe 200. Both the pipe 200 and the stretching die 50 can pass through the through hole.

[0041] The heater is an annular heating plate 60 , the stretching die 50 is fixed at the output end of the linear drive 51 , the linear drive 51 is fixed on the frame 100 , the linear drive 51 is used to drive the stretching film to move axially along the pipe 200 , and the moving axis of the stretching die 50 passes through the annular center of the heating plate 60 .

[0042] The heating plate 60 is detachably connected to the frame 100. An elastic member 61 is provided between the heating plate 60 and the frame 100. The elastic member 61 is a spring. The deformation of the spring is convenient for the axial direction of the pipeline 200. Through the setting of the spring, a certain distance is provided between the heating plate 60 and the frame 100.

[0043] In a specific embodiment, a fixing plate 62 is fixed on the frame 100, and a plurality of mounting holes are provided around the heating plate 60. Bolts are inserted into the mounting holes, and the ends of the bolts are fixed on the fixing plate 62. There is a gap between the bolts and the mounting holes. The elastic member 61, that is, a spring, is sleeved on the bolts, and both ends of the spring are simultaneously against the heating plate 60 and the fixing plate 62.

[0044] This embodiment also provides a method for plastic sealing an end of a composite pipe 200, comprising the following steps:

[0045] S1. The end of the pipe 200 contacts the heating plate 60 to heat and soften the end material. After heating and softening, the pipe 200 is away from the heating plate 60.

[0046] S2. The stretching die 50 moves relative to the pipe 200 toward the outside of the pipe 200 to pull the softened material at the end of the pipe 200 out of the pipe 200.

[0047] S3, the shaping mold 40 moves from the non-working position to the working position, and pushes the pipe 200 completed in S2 to be inserted into the shaping groove of the shaping mold 40 to complete shaping.

[0048] In step S1, after the pipe 200 extends out of the clamp 30 for a certain distance, the clamp 30 is controlled to clamp the pipe 200, and the pusher 20 drives the pipe 200 to move toward the heating plate 60, so that there is an extrusion force between the end of the pipe 200 and the heating plate 60, ensuring that after the material of the end of the pipe 200 is softened, the metal wire 201 at the end of the pipe 200 will be slightly compressed into the tube under the release of the elastic force of the elastic member 61.

[0049] In step S2, the outer circumference of the stretching die 50 used is a conical surface, and the maximum circumferential dimension of the conical surface matches the inner hole clearance of the pipe 200 to ensure that the softened material can be pulled outward when the stretching die 50 moves outward relative to the pipe 200.

[0050] In the S3 shaping step, since the metal wire 201 is often located in the middle or outside of the wall thickness of the pipe 200, the shaping ring groove 411 of the conical surface will shape the softened and pulled-out pipe plastic, which can force the softened and pulled-out material not to be completely axially back-pressed, but to move to the outside of the pipe 200 under the resistance of the conical surface and the inner wall of the pipe 200, thereby increasing the thickness of the plastic material at the front end of the metal mesh, ensuring that the metal mesh is completely immersed in the pipe 200, and completely avoiding the exposure of the metal wire 201.

[0051] The entire embodiment breaks the situation that the end of the existing pipe 200 must be sealed with a sealing ring. Instead, the metal wire 201 is compressed into the pipe on the one hand, and the material of the inner wall of the pipe 200 is softened and then wrapped outward to increase the thickness of the plastic material covering the front end of the metal wire 201, thereby completely ensuring that the metal wire 201 is not exposed. The operation method is greatly simplified compared to the existing sealing technology with a sealing ring. After the sealing is completed, a smooth tapered hole is naturally formed on the inner wall of the pipe 200, and there is basically no excess material protruding from the inner wall of the pipe 200, thereby eliminating the work of grinding the inside of the pipe, greatly shortening the time spent on the plastic sealing of the end, and there is no requirement or very low requirement for the workers' own technical level, thereby reducing labor costs.

[0052] In addition, the front end of the metal wire 201 is covered with the material of the pipe itself, so that the sealing ring in the prior art will not fall off after long-term use. The inner tapered hole at the end of the pipe 200 is convenient for the subsequent splicing of the pipes 200.

[0053] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution is not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A pipe end plastic sealing device, comprising a heater for heating the pipe end, characterized in that: It also includes a pusher, a stretching die and a shaping die. The pusher is used to drive the pipe to move axially. The stretching die is used to be inserted into the inside of the pipe. The stretching die can move axially. The shaping die is installed at the output end of the driver. The driver is used to drive the shaping die to switch between the working position and the non-working position. The shaping die is provided with a shaping ring groove. When the shaping ring groove is in the working position, it is coaxial with the pipe. The pipe end can be inserted into the shaping ring groove.

2. The pipe end plastic sealing device according to claim 1, characterized in that: The inner side wall of the shaping ring groove is a conical surface, and the conical surface of the shaping ring groove can abut against the softened inner wall of the pipe end.

3. The pipe end plastic sealing device according to claim 2, characterized in that: There are multiple shaping ring grooves.

4. The pipe end plastic sealing device according to claim 3, characterized in that: The shaping mold comprises a template and a shaping ring detachably connected to the template, and a shaping ring groove is arranged on the shaping ring.

5. The pipe end plastic sealing device according to any one of claims 1 to 4, characterized in that: The heater is an annular heating plate, and the moving axis of the stretching die passes through the annular center of the heating plate.

6. The pipe end plastic sealing device according to claim 5, characterized in that: The heating plate is installed on the frame, and an elastic member is arranged between the heating plate and the frame.

7. The pipe end plastic sealing device according to claim 5, characterized in that: The shaping die is located between the pusher and the heater, and is connected to a fixed seat which is slidably connected along the radial direction of the pipeline. The fixed seat is provided with a through hole, the size of which is larger than the size of the pipeline, and the pipeline and the stretching die can both pass through the through hole.

8. The pipe end plastic sealing device according to any one of claims 1-4, 6-7, characterized in that: It also includes a clamp, which includes a first clamping shoe and a second clamping shoe that can clamp the pipe, at least one of the first clamping shoe and the second clamping shoe can move radially along the pipe, and after the first clamping shoe and the second clamping shoe clamp the pipe, the central axis of the pipe coincides with the central axis of the shaping ring groove.

9. The pipe end plastic sealing device according to claim 8, characterized in that: The first clamping tile and the second clamping tile both include a tile seat and an arc-shaped clamping plate detachably connected to the tile seat.

10. The pipe end plastic sealing device according to claim 8, characterized in that: The pusher is a double-rod oil cylinder / double-rod air cylinder, the piston rod of the pusher is fixed and the cylinder body moves, the clamper is fixed on the cylinder body of the pusher, and the bidirectional piston rod of the pusher is parallel to the pipeline axis.

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