Precise cooling device of engineering plastic extruder

Abstract

The utility model discloses a precise cooling device of an engineering plastic extruder, which comprises a plurality of sections of extruder barrels which are continuously connected, a hot water pipe and a cold water pipe, a water inlet channel is connected with a water inlet pipe, the water inlet pipe is connected with the cold water pipe, an electric throttle valve and a flow transmitter are arranged on the water inlet pipe, a water outlet channel is connected with a water return pipe, and the water return pipe is connected with a water outlet pipe. The water return pipe is connected with the hot water pipe, a temperature transmitter is installed on the barrel, the temperature transmitter and the flow transmitter are in signal connection with a controller, and the controller is in signal connection with the electric throttle valve. According to the utility model, the temperature transmitter is arranged on each section of the extruder barrel, and the electric throttle valve and the flow transmitter are arranged on the water inlet pipe corresponding to each section of the extruder barrel, so that the effect of carrying out cooling by carrying out different temperature change gradients according to actual requirements is achieved, and engineering plastics can exert better performance and achieve better quality.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic extruders, in particular to a precision cooling device for engineering plastic extruders. Background Art

[0002] Engineering plastics have high rigidity, low creep, high mechanical strength, good heat resistance, and good electrical insulation. They can be used for a long time in harsh chemical and physical environments. They have excellent comprehensive properties and can be used as engineering materials and plastics to replace metal in the manufacture of machine parts. Due to their relatively good quality, they are relatively expensive.

[0003] In order to ensure the quality of some plastic products, engineering plastics are used as raw materials. During the processing of engineering plastic extruders, the extruder barrel needs to be heated and cooled to ensure that the extruder barrel at different positions reaches the corresponding appropriate temperature. The extruder barrel is heated by resistance heating, and cooled by air cooling, water cooling, and a combination of air cooling and water cooling. Among them, air cooling has a slower cooling response, while water cooling has a more obvious cooling effect than air cooling, and is often used in medium and large plastic extruders.

[0004] Existing engineering plastic extruders use a separate cooling water supply to each barrel section, controlled by a solenoid valve. When the temperature is too high, the solenoid valve opens, allowing cold water to cool the extruder. Once the temperature drops, the solenoid valve closes. This system, with only two modes (cooling and non-cooling) corresponding to the solenoid valve on and off, results in large temperature differential control errors in actual use. Furthermore, the cooling rate is too rapid, preventing slow and precise cooling, resulting in poor cooling performance and hindering the performance and quality of engineering plastics. Utility Model Content

[0005] In view of the deficiencies in the prior art, the utility model provides a precision cooling device for an engineering plastic extruder, which is used to solve the problem that the existing engineering plastic extruder cannot cool down slowly and accurately, resulting in poor cooling effect.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A precision cooling device for an engineering plastic extruder comprises a plurality of continuously connected extruder barrels, a hot water pipe and a cold water pipe. The extruder barrel comprises a barrel body, end plates at both ends of the barrel body and an extrusion cavity at the center of the barrel body and the end plates. A plurality of cooling channels are axially arranged around the extrusion cavity in the interior of the barrel body. Diversion channels and converging channels connecting the plurality of cooling channels are respectively arranged in the end plates on both sides of the barrel body. A water inlet channel connecting the diversion channel is arranged below the interior of the end plates, and a water outlet channel connecting the converging channel is arranged above the interior of the end plates.

[0008] The water inlet channel is connected to the water inlet pipe, the water inlet pipe is connected to the cold water pipe, the water inlet pipe is installed with an electric throttle valve and a flow transmitter, the water outlet channel is connected to the return pipe, the return pipe is connected to the hot water pipe, the cylinder is installed with a temperature transmitter, the temperature transmitter and the flow transmitter are connected to the controller signal, and the controller is connected to the electric throttle valve signal.

[0009] Preferably, the hot water pipe and the cold water pipe are both arranged below the extruder barrel.

[0010] Preferably, the cylinder and the end plate are an integral structure.

[0011] Preferably, the distances between the plurality of cooling channels and the extrusion cavity are all equal.

[0012] Preferably, the electric throttle valve is located upstream of the flow transmitter.

[0013] Preferably, the water inlet pipe is arranged vertically.

[0014] Preferably, the temperature transmitter is installed at the center of the top of the cylinder.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The utility model installs a temperature transmitter on each section of the extruder barrel, and installs an electric throttle valve and a flow transmitter on the water inlet pipe corresponding to each section of the extruder barrel. The opening of the electric throttle valve is adjusted according to the actual temperature of each section of the extruder barrel and the actual flow of the connected cold water. Not only can the opening of the electric throttle valve be increased or decreased according to the flow change caused by the simultaneous connection of multiple sections of the extruder barrel with cold water, but the opening of the electric throttle valve can also be adjusted according to the temperature of each section of the extruder barrel and the required cooling speed. The on-off adjustment can also be made according to whether cooling is needed, so as to achieve the effect of cooling with different temperature change gradients according to actual needs, so that engineering plastics can exert better performance and achieve better quality, and solve the problem that the existing engineering plastic extruder cannot cool slowly and accurately, resulting in poor cooling effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a side view of the utility model;

[0019] Figure 3 This is a schematic diagram of the structure of the extruder barrel of the utility model;

[0020] Figure 4 For this utility model Figure 3 Cross-section at AA;

[0021] Figure 5 For this utility model Figure 3 Cross-section at the middle BB;

[0022] Figure 6 For this utility model Figure 3 Cross-section at CC;

[0023] Figure 7 This is the principle diagram of the cooling system of this utility model.

[0024] In the figure: 1. Extruder barrel; 101. Cylinder body; 102. End plate; 103. Extrusion chamber; 2. Hot water pipe; 3. Cold water pipe; 4. Cooling channel; 5. Diversion channel; 6. Converging channel; 7. Water inlet channel; 8. Water outlet channel; 9. Water inlet pipe; 10. Electric throttle valve; 11. Flow transmitter; 12. Return pipe; 13. Temperature transmitter; 14. Controller. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] like Figure 1-7 As shown, the utility model provides a technical solution: a precision cooling device for an engineering plastic extruder, comprising a multi-section continuously connected extruder barrel 1, a hot water pipe 2, and a cold water pipe 3. The extruder barrel 1 comprises a barrel body 101, end plates 102 at both ends of the barrel body 101, and an extrusion cavity 103 at the center of the barrel body 101 and the end plates 102. The barrel body 101 and the end plates 102 are an integrated structure. The hot water pipe 2 and the cold water pipe 3 are both arranged below the extruder barrel 1, which is conducive to the cooling channel 4, the diversion channel 5, and the converging channel 6 being filled with cold water.

[0027] The interior of the cylinder 101 is provided with a plurality of cooling channels 4 axially around the extrusion cavity 103. The plurality of cooling channels 4 are equidistant from the extrusion cavity 103, which is conducive to uniform cooling. The end plates 102 on both sides of the cylinder 101 are provided with a diversion channel 5 and a converging channel 6 respectively connected to the plurality of cooling channels 4. The interior of the end plate 102 is provided with a water inlet channel 7 connected to the diversion channel 5 at the lower part, and a water outlet channel 8 connected to the converging channel 6 at the upper part.

[0028] The water inlet channel 7 is connected to the water inlet pipe 9, which is connected to the cold water pipe 3. An electric throttle valve 10 and a flow transmitter 11 are installed on the water inlet pipe 9. The water inlet pipe 9 is arranged vertically. The electric throttle valve 10 is located upstream of the flow transmitter 11 and is used to detect the actual flow of cold water in the water inlet pipe 9 in real time.

[0029] The water outlet channel 8 is connected to the return pipe 12, and the return pipe 12 is connected to the hot water pipe 2. A temperature transmitter 13 is installed on the cylinder 101. The temperature transmitter 13 is installed in the center of the top of the cylinder 101, where the temperature is more representative. The temperature transmitter 13 and the flow transmitter 11 are connected to the controller 14 signal, and the controller 14 is connected to the electric throttle valve 10 signal.

[0030] Working principle:

[0031] The cold water produced by the chiller (not shown) is transported through the cold water pipe 3, enters the water inlet channel 7 through the water inlet pipe 9, passes through the diversion channel 5, the cooling channel 4, the converging channel 6, the water outlet channel 8 and the return pipe 12, enters the hot water pipe 2, and is transported back to the chiller for further cooling;

[0032] The temperature transmitter 13 monitors the temperature of each section of the extruder barrel 1 in real time, and the flow transmitter 11 monitors the cold water flow in the water inlet pipe 9 corresponding to each section of the extruder barrel 1 in real time. The controller 14 adjusts the on-off and opening of the electric throttle valve 10 according to the actual temperature, required temperature and required temperature change gradient of the extruder barrel 1 to achieve cooling with different temperature gradients, making the cooling control more accurate, reducing temperature error and improving cooling effect.

[0033] It should be noted that, in this document, terms such as "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0034] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A precision cooling device for an engineering plastic extruder, comprising a plurality of continuously connected extruder barrels (1), a hot water pipe (2) and a cold water pipe (3), characterized in that: The extruder barrel (1) comprises a barrel (101), end plates (102) at both ends of the barrel (101), and an extrusion cavity (103) at the center of the barrel (101) and the end plates (102); a plurality of cooling channels (4) are axially arranged around the extrusion cavity (103) inside the barrel (101); a diversion channel (5) and a converging channel (6) communicating with the plurality of cooling channels (4) are respectively arranged inside the end plates (102) on both sides of the barrel (101); a water inlet channel (7) communicating with the diversion channel (5) is arranged below the end plates (102); and a water outlet channel (8) communicating with the converging channel (6) is arranged above the end plates (102); The water inlet channel (7) is connected to the water inlet pipe (9), the water inlet pipe (9) is connected to the cold water pipe (3), the water inlet pipe (9) is installed with an electric throttle valve (10) and a flow transmitter (11), the water outlet channel (8) is connected to the return pipe (12), the return pipe (12) is connected to the hot water pipe (2), the cylinder (101) is installed with a temperature transmitter (13), the temperature transmitter (13) and the flow transmitter (11) are connected to the controller (14) for signal transmission, and the controller (14) is connected to the electric throttle valve (10) for signal transmission.

2. The precision cooling device for an engineering plastic extruder according to claim 1, characterized in that: The hot water pipe (2) and the cold water pipe (3) are both arranged below the extruder barrel (1).

3. The precision cooling device for an engineering plastic extruder according to claim 1, characterized in that: The cylinder (101) and the end plate (102) are an integrated structure.

4. The precision cooling device for an engineering plastic extruder according to claim 1, characterized in that: The distances between the plurality of cooling channels (4) and the extrusion cavity (103) are all equal.

5. The precision cooling device for an engineering plastic extruder according to claim 1, characterized in that: The electric throttle valve (10) is located upstream of the flow transmitter (11).

6. The precision cooling device for an engineering plastic extruder according to claim 1, characterized in that: The water inlet pipe (9) is arranged vertically.

7. The precision cooling device for an engineering plastic extruder according to claim 1, characterized in that: The temperature transmitter (13) is installed at the top center of the cylinder (101).

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