A double-wall corrugated pipe processing system using co-rotating conical twin screws

Abstract

The present invention discloses a double-wall corrugated pipe processing system using a co-rotating conical twin-screw, which is composed of a mixer, a dryer, a feeding device, an extruder, a cutting machine and a cooling device connected in sequence; wherein the extruder is a co-rotating conical twin-screw extruder, and the extrusion die head at the front end of the extruder is a low-pressure extrusion die head; the cooling device comprises a guide frame coaxially arranged with the inlet and outlet of the cutting machine, a cooling water trough is arranged below the guide frame, the side of the guide frame is hinged to the upper end of the support frame, the lower end of the support frame is fixed on the cooling water trough, and a material turning and pushing device is arranged between the guide frame and the support frame. The system of the present invention has the characteristics of stable pipe weight and low material drying requirements, as well as long service life, strong plasticizing ability and large output, and can meet production needs.

Description

Technical Field

[0001] The invention relates to a double-wall corrugated pipe processing system, in particular to a double-wall corrugated pipe processing system using co-rotating conical twin screws. Background Art

[0002] Double-wall corrugated pipe is a new type of pipe with an annular outer wall and a smooth inner wall. It was first successfully developed in Germany in the early 1980s. After more than ten years of development and improvement, it has developed from a single variety to a complete product series. At present, it is very mature in production technology and application technology. Due to its excellent performance and relatively economical cost, it has been greatly promoted and applied in developed countries such as Europe and the United States. In my country, the promotion and application of HDPE double-wall corrugated pipe is in an upward trend, and all technical indicators have reached the use standard.

[0003] The processing equipment of double-wall corrugated pipe mainly includes vacuum feeder, dryer, extruder, molding machine, cooler and cutting machine, among which the extruder is the equipment most closely related to the performance of double-wall corrugated pipe. At present, the extruders used in the extruders of double-wall corrugated pipe processing equipment are single screw and counter-rotating conical twin screw. Among them, the defects of single screw are: (1) single screw is generally saturated feeding, the conveying accuracy is poor, and the weight of the pipe is unstable; (2) single screw has no exhaust function and has high requirements for material drying. In order to solve the above problems, some people use counter-rotating conical twin screws, but counter-rotating conical twin screws also have defects: due to the structural characteristics of the conical screw, the head pressure has a greater impact on the conical screw and gearbox. When the working pressure of the head is too large (greater than 10MPa), the conical screw is easy to break and the gearbox is easy to be damaged, and the service life is short; at the same time, the speed of this type of screw is low, resulting in limited plasticizing capacity, and the output is much lower than that of the single screw, which cannot meet the production requirements. Summary of the invention

[0004] The purpose of the present invention is to provide a double-wall corrugated pipe processing system using a co-rotating conical twin screw. The system of the present invention has the characteristics of stable pipe weight and low material drying requirements, long service life, strong plasticizing ability, and large output, and can meet production needs.

[0005] The technical solution of the present invention is as follows: a double-wall corrugated pipe processing system using co-rotating conical twin-screws, which is composed of a mixer, a dryer, a feeding device, an extruder, a cutting machine and a cooling device connected in sequence; wherein the extruder is a co-rotating conical twin-screw extruder, and the extrusion die head at the front end of the extruder is a low-pressure extrusion die head; the cooling device comprises a material guide frame coaxially arranged with the inlet and outlet of the cutting machine, a cooling water trough is provided below the material guide frame, the side surface of the material guide frame is hinged to the upper end of the support frame, the lower end of the support frame is fixed on the cooling water trough, and a material turning and pushing device is provided between the material guide frame and the support frame.

[0006] The aforementioned double-wall corrugated pipe processing system using co-rotating conical twin screws has a loss-in-weight scale at the feed inlet of the extruder.

[0007] In the aforementioned double-wall corrugated pipe processing system using co-rotating conical twin screws, the low-pressure extrusion die head is a die head with a pressure of less than 10 MPa.

[0008] The aforementioned double-wall corrugated pipe processing system using co-rotating conical twin screws, wherein the feeding device is a spiral feeder or a conveyor belt feeder.

[0009] The aforementioned double-wall corrugated pipe processing system using co-rotating conical twin screws, the material guide frame is two symmetrical arc plates one and two, the opposite outer sides of arc plates one and two are respectively hinged on the upper end of the support frame, and a material turning and pushing device is respectively provided between the opposite outer sides of arc plates one and two and the support frame on the same side.

[0010] In the aforementioned double-wall corrugated pipe processing system using co-rotating conical twin screws, the inner sides of the arc plate 1 and the arc plate 2 facing each other are respectively provided with supporting wheels that rotate along the moving direction of the corrugated pipe.

[0011] Beneficial effects of the present invention

[0012] 1. The present invention adopts a twin-screw extruder, which solves the disadvantage of unstable pipe weight in the previous single-screw extrusion corrugated pipe production process, and has the advantage of stable pipe weight;

[0013] 2. After the twin-screw extruder is used in the present invention, saturated feeding is not required, thereby reducing the requirements for the drying degree of the material, and having the advantage of lower material drying requirements;

[0014] 3. The twin-screw extruder of the present invention is a co-rotating conical twin-screw, which can greatly reduce the pressure of the die head after being matched with a low-pressure extrusion die head, thereby extending the service life of the screw and the gear box;

[0015] 4. The present invention can greatly increase the speed of the screw by improving the structure of the extruder, thereby greatly improving the plasticizing and mixing capabilities of the material, and increasing the production capacity of the system to meet the needs of mass production.

[0016] 5. The present invention further stabilizes the material transportation by configuring a loss-in-weight scale on the extruder, making the weight of the pipe more stable. At the same time, it also optimizes the working conditions of the extruder and effectively reduces damage to the equipment.

[0017] 6. The present invention improves the cooling system on the basis of increasing the speed of extruding the corrugated pipe. Different from the traditional cooling system, the traditional processing line has a slow extrusion speed, so the method of spray cooling after extrusion and then cutting is adopted. However, after the extrusion speed is significantly increased, this cooling method can no longer meet the needs of rapid production. Therefore, the application adopts the above-mentioned scheme to directly cut off the pipe after extrusion, and then immediately turn the cut corrugated pipe into the cooling water tank for cooling. This changes the traditional method of cooling while extruding, so that the extrusion speed is completely unaffected by the cooling speed, thereby greatly improving the production speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1 It is a structural schematic diagram of the present invention;

[0019] Attached Figure 2 A schematic diagram of the cooling device.

[0020] Explanation of the reference numerals: 1-mixer, 2-dryer, 3-feeding device, 4-extruder, 5-cutting machine, 6-loss-in-weight scale, 7-extrusion die head, 8-material guide rack, 81-arc plate one, 82-arc plate two, 9-cooling water tank, 10-support frame, 11-material turning and pushing device, 12-support wheel. DETAILED DESCRIPTION

[0021] The present invention will be further described below in conjunction with the embodiments, but they are not intended to limit the present invention.

[0022] Embodiments of the present invention

[0023] Example 1: A double-wall corrugated pipe processing system using co-rotating conical twin screws, as shown in the attached Figure 1-2 As shown, it is mainly composed of a mixer 1, a dryer 2, a feeding device 3, a cutter 5 and a cooling device connected in sequence; wherein the extruder 4 is a co-rotating conical twin-screw extruder, and the extrusion die 7 at the front end of the extruder 4 is a low-pressure extrusion die; the cooling device includes a guide frame 8 coaxially arranged with the inlet and outlet of the cutter 5, a cooling water trough 9 is provided below the guide frame 8, the side of the guide frame 8 is hinged to the upper end of the support frame 10, the lower end of the support frame 10 is fixed on the cooling water trough 9, and a material turning and pushing device 11 (a cylinder or an oil cylinder can be selected) is provided between the guide frame 8 and the support frame 10.

[0024] When in use, according to the conventional steps of corrugated pipe production, the material is put into the mixer 1 for stirring and mixing, and then transported to the dryer 2 for drying through the pipeline. Since the system of the present invention does not have high enough requirements for the drying of the material, ordinary drying is sufficient, and then it is transported to the extruder 4 through the feeding device 3. The screw in the extruder 4 is a co-directional conical twin screw, which can rotate quickly and efficiently extrude the plasticized material. It is extruded and formed through a low-pressure extrusion die 7. The extruded corrugated pipe passes through the cutting machine 5 and enters the guide rack 8. When the length requirement is reached, it is immediately cut off by the cutting machine 5. Then the material turning and pushing device 11 is manually or automatically controlled to start, and the corrugated pipe is turned from the guide rack 8 into the cooling water tank 9 below. There is cooling water in the cooling water tank 9, and the corrugated pipe can be immersed and cooled, and the cooling speed is faster. After the corrugated pipe falls, the material turning and pushing device 11 is also manually or automatically controlled to start to reset the guide rack 8 to produce the next section of corrugated pipe.

[0025] Preferably, a loss-in-weight scale 6 is provided at the feed port of the extruder 4, and the entry of the material is controlled by the loss-in-weight scale 6, so that the amount of material in the extruder 4 is more stable and the weight of the pipe is more stable.

[0026] Preferably, the low-pressure extrusion die is a die with a pressure less than 10 MPa.

[0027] Preferably, the feeding device 3 is a screw feeder or a conveyor belt feeder. The present embodiment adopts a conveyor belt feeder.

[0028] Preferably, the guide frame 8 is composed of two symmetrical curved plates 1 81 and 82, the opposite outer sides of the curved plates 1 81 and 82 are respectively hinged to the upper end of the support frame 10, and a material turning and pushing device 11 is respectively provided between the opposite outer sides of the curved plates 1 81 and 82 and the support frame 10 on the same side thereof, and one end of the material turning and pushing device 11 is hinged to the curved plates 1 81 and 82, and the other end is hinged to the support frame 10. When turning the material, the material turning and pushing device 11 contracts, the lower ends of the curved plates 1 81 and 82 are opened, and the corrugated pipe automatically falls into the cooling water tank 9 below, and then the material turning and pushing device 11 is extended, so that the lower ends of the curved plates 1 81 and 82 are closed, and the production of the next section of the corrugated pipe is carried out.

[0029] Preferably, the inner sides of the arc plate 1 81 and the arc plate 2 82 are respectively provided with supporting wheels 12 rotating along the moving direction of the bellows, so as to facilitate the movement of the bellows and avoid scratches.

Claims

1. A double-wall corrugated pipe processing system using co-rotating conical twin screws, characterized in that: The invention is composed of a mixer (1), a dryer (2), a feeding device (3), an extruder (4), a cutter (5) and a cooling device which are connected in sequence; wherein the extruder (4) is a co-rotating conical twin-screw extruder, and the extrusion die (7) at the front end of the extruder (4) is a low-pressure extrusion die; the cooling device comprises a guide frame (8) which is coaxially arranged with the inlet and outlet of the cutter (5); a cooling water trough (9) is arranged below the guide frame (8); the side of the guide frame (8) is hinged to the upper end of a support frame (10); the lower end of the support frame (10) is fixed on the cooling water trough (9); and a material turning and pushing device (11) is arranged between the guide frame (8) and the support frame (10); The material guide frame (8) is composed of two symmetrical arc-shaped plates, one (81) and one (82), wherein the opposite outer sides of the arc-shaped plates (81) and the second (82) are respectively hinged to the upper end of the support frame (10), and a material turning and pushing device (11) is respectively provided between the opposite outer sides of the arc-shaped plates (81) and the second (82) and the support frame (10) on the same side thereof.

2. The double-wall corrugated pipe processing system using co-rotating conical twin screws according to claim 1, characterized in that: A loss-in-weight scale (6) is provided at the feed inlet of the extruder (4).

3. The double-wall corrugated pipe processing system using co-rotating conical twin screws according to claim 1, characterized in that: The low-pressure extrusion die is a die with a pressure less than 10 MPa.

4. The double-wall corrugated pipe processing system using co-rotating conical twin screws according to claim 1, characterized in that: The feeding device (3) is a screw feeder or a conveyor belt feeder.

5. The double-wall corrugated pipe processing system using co-rotating conical twin screws according to claim 1, characterized in that: Support wheels (12) that rotate along the moving direction of the corrugated pipe are respectively provided on the opposite inner sides of the arc plate 1 (81) and the arc plate 2 (82).

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