Cooling water tank structure for flame-retardant environment-friendly plastic packaging bag extruder

Abstract

The utility model discloses a cooling water tank structure for a flame-retardant environment-friendly plastic packaging bag extruder, which belongs to the technical field of plastic packaging bag processing equipment and comprises an extruder base, a transmission box body is arranged above the extruder base, the rear of the transmission box body is connected with a driving motor, the upper part of the transmission box body is communicated with a feed hopper, and the upper part of the feed hopper is communicated with a cooling water tank. The front portion of the transmission box body is in transmission connection with an extrusion screw, the extrusion screw is sleeved with an extrusion barrel, a protective shell is arranged on the outer side of the extrusion barrel, and a plurality of annular cooling water pipes are arranged on the arc-shaped inner side face of the feeding end of the feeding hopper from top to bottom at intervals. The left side and the right side of each annular cooling water pipe are communicated with a first water inlet pipe and a first water outlet pipe through pipelines. According to the cooling water tank structure, the independent temperature control modules with three partitions are designed, the temperature of each module can be adjusted and controlled, and the processing quality of a mixture formed by plastic raw materials and flame retardants is met.

Description

Technical Field

[0001] The utility model relates to the technical field of plastic packaging bag processing equipment, and more specifically, to a cooling water tank structure for a flame-retardant and environmentally friendly plastic packaging bag extruder. Background Art

[0002] In order to improve the use safety of plastic packaging bags, during the processing of plastic raw materials, it is necessary to additionally add a flame retardant to form a mixture to improve the flame retardant performance of the plastic, so as to delay combustion, block smoke and even make the burning part self-extinguish. Generally, halogen-containing flame retardants are added. Halogens are chain terminators in the plastic combustion reaction, generating hydrogen halide during plastic combustion to inhibit the combustion reaction. And the processed mixture of the packaging bag added with the flame retardant has relatively strict requirements for temperature.

[0003] In the actual production and processing process, in order to ensure the smooth entry of the mixture at the feeding port, the solid friction property must be maintained, so cooling is required. At the same time, at the lower end of the feeding port, the cooling effect needs to be slightly reduced to heat the material and promote later melting. In addition, after the mixture melts on the extrusion screw, the barrel needs to be kept at a low temperature to keep the mixture at a high viscosity and prevent the material from overheating and dispersing, so as to achieve low-temperature extrusion. In each of the above processes, the requirements for the cooling temperature are different, so the cooling temperature needs to be controlled. The existing cooling water tank structure has a poor temperature zoning control effect and cannot well meet the extrusion requirements of flame-retardant and environmentally friendly plastics, affecting the processing quality of the subsequent blown film raw materials. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a cooling water tank structure for a flame-retardant and environmentally friendly plastic packaging bag extruder. The cooling water tank structure is designed with an independent temperature control module with three zones, and the temperature of each module can be adjusted and controlled to meet the processing quality of the plastic raw materials and the mixture formed by adding the flame retardant.

[0005] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0006] A cooling water tank structure for a flame-retardant and environmentally friendly plastic packaging bag extruder, comprising an extruder base. Above the base is provided a transmission box body. A driving motor is connected behind the transmission box body, and a feed hopper is communicated above the transmission box body. In front of the transmission box body is drivingly connected an extrusion screw, and an extrusion cylinder is sleeved around the extrusion screw. A protective shell is provided outside the extrusion cylinder. On the inner arc surface of the feeding end of the feed hopper, several annular cooling water pipes are arranged at intervals from top to bottom. Both the left and right sides of the several annular cooling water pipes are communicated with a first water inlet pipe and a first water outlet pipe through pipelines. Inside the end seat at the discharging end of the feed hopper is embedded a spiral cooling water pipe. The upper and lower ends of the spiral cooling water pipe are respectively communicated with a second water inlet pipe and a second water outlet pipe. A cooling sleeve is installed around the rear end of the melting section of the extrusion cylinder. The front and rear ends of the cooling sleeve are respectively communicated with a third water inlet pipe and a third water outlet pipe. Above the base, three parallel cooling water tanks are also installed through brackets.

[0007] As a further optimization of this solution, in the three parallel cooling water tanks, one end of the leftmost cooling water tank is communicated with the third water inlet pipe and the other end is communicated with a circulation pipeline. One end of the middle cooling water tank is communicated with the second water inlet pipe and the other end is communicated with the circulation pipeline. One end of the rightmost cooling water tank is communicated with the first water inlet pipe and the other end is communicated with the circulation pipeline. The first water outlet pipe, the second water outlet pipe and the third water outlet pipe are all communicated to the inside of the circulation water tank, and the circulation water tank is externally connected with a circulation water pump.

[0008] As a further optimization of this solution, in the three parallel cooling water tanks, a water temperature sensor is provided inside each cooling water tank, and a condenser is installed on the outer side of each cooling water tank. One end of the condenser is connected to a compressor, and the compressor is connected to an evaporator in series through a pipeline with an expansion valve, and the evaporator is connected to the other end of the condenser in series through a pipeline with a liquid storage tank.

[0009] As a further optimization of this solution, the cooling sleeve includes annular pipes on both sides and several transverse pipelines in the middle. Among the several transverse pipelines, several arc-shaped branch pipes are provided between adjacent transverse pipelines. The several annular cooling water pipes are all communicated to the first water inlet pipe and the first water outlet pipe through transverse branch pipes.

[0010] As a further optimization of this solution, control panels are provided on the upper surfaces of the three parallel cooling water tanks, and the control panels are respectively connected to the compressor and the water temperature sensor through circuits.

[0011] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0012] In the present utility model, by setting three independent cooling water tank structures, in combination with refrigeration equipment such as condensers and water temperature sensors, the water temperature in each cooling water tank can be independently adjusted in zones, respectively for adapting to the corresponding cooling temperatures required by the annular cooling water pipe, the spiral cooling water pipe, and the cooling sleeve, so as to meet the processing quality of the mixture formed by plastic raw materials and flame retardants.

[0013] In the present utility model, the spaced annular cooling water pipe structure provided on the inner arc surface at the feeding end of the feeding hopper can cool the mixture inside the feeding hopper step by step in sequence, which can effectively prevent the heat on the barrel side of the feeding hopper from being transmitted to the thrust bearing and the reduction gearbox. The annular cooling water pipe can better cover the annular area on the barrel side, and the cooling effect is better. The spiral cooling water pipe is embedded inside the end seat at the discharging end of the feeding hopper to continuously slightly reduce the cooling effect on the mixture for heating the material to promote later melting. By designing a cooling sleeve structure with a ring pipe, several transverse pipelines, and several arc-shaped branch pipes, the rear end of the melting section of the extrusion barrel is wrapped and cooled in all directions, so that the mixture maintains a high viscosity, prevents the material from overheating and dispersing, and realizes low-temperature extrusion. Brief Description of the Drawings

[0014] Figure 1 It is a schematic diagram of the installation structure on one side of the cooling water tank of the present utility model (part of the protective shell is cut away);

[0015] Figure 2 It is a schematic diagram of the installation structure of the annular cooling water pipe and the spiral cooling water pipe of the present utility model (part of the feeding hopper shell is cut away);

[0016] Figure 3 It is a schematic diagram of the installation structure on the other side of the cooling water tank of the present utility model (part of the protective shell is cut away);

[0017] Figure 4 It is a schematic diagram of the installation structure of three parallel cooling water tanks of the present utility model;

[0018] In the figure: 1. Machine base; 2. Transmission box body; 3. Extrusion barrel; 4. Protective shell; 5. Feeding hopper; 6. Annular cooling water pipe; 7. Spiral cooling water pipe; 8. Cooling sleeve; 9. Third water inlet pipe; 10. Second water inlet pipe; 11. First water inlet pipe; 12. Cooling water tank; 13. First water outlet pipe; 14. Second water outlet pipe; 15. Third water outlet pipe; 16. Circulation water tank; 17. Circulation pipeline; 18. Circulation water pump; 19. Condenser; 20. Compressor; 21. Liquid storage tank; 22. Expansion valve; 23. Evaporator. Detailed Embodiment

[0019] In order to make the technical means, creative features, achieved purposes and functions realized by the utility model easy to understand, the present utility model will be further described below with reference to specific drawings.

[0020] In order to solve the problem that the existing cooling water tank structure has a poor effect on the zonal control of temperature, cannot better meet the extrusion requirements of flame-retardant and environmentally friendly plastics, and affects the processing quality of subsequent blown film raw materials, as Figure 1 and Figure 2 shown, this application includes an extruder base 1. Above the base 1, there is a transmission box body 2. A driving motor is connected behind the transmission box body 2, and a feed hopper 5 is communicated above the transmission box body 2. In front of the transmission box body 2, an extrusion screw is drivingly connected, and an extrusion cylinder 3 is sleeved outside the extrusion screw. A protective shell 4 is arranged outside the extrusion cylinder 3. On the inner side of the arc of the feeding end of the feed hopper 5, a number of annular cooling water pipes 6 are arranged at intervals from top to bottom. Both the left and right sides of the number of annular cooling water pipes 6 are communicated with a first water inlet pipe 11 and a first water outlet pipe 13 through pipelines. A spiral cooling water pipe 7 is embedded inside the end seat at the discharging end of the feed hopper 5. The upper and lower ends of the spiral cooling water pipe 7 are respectively communicated with a second water inlet pipe 10 and a second water outlet pipe 14. A cooling sleeve 8 is installed around the rear end of the melting section of the extrusion cylinder 3. The front and rear ends of the cooling sleeve 8 are respectively communicated with a third water inlet pipe 9 and a third water outlet pipe 15. Above the base 1, three parallel cooling water tanks 12 are also installed through brackets;

[0021] As Figure 3 shown, among the three parallel cooling water tanks 12, one end of the leftmost cooling water tank 12 is communicated with the third water inlet pipe 9 and the other end is communicated with a circulation pipeline 17. One end of the middle cooling water tank 12 is communicated with the second water inlet pipe 10 and the other end is communicated with the circulation pipeline 17. One end of the rightmost cooling water tank 12 is communicated with the first water inlet pipe 11 and the other end is communicated with the circulation pipeline 17. The first water outlet pipe 13, the second water outlet pipe 14 and the third water outlet pipe 15 are all communicated inside the circulation water tank 16, and the circulation water tank 16 is externally connected with a circulation water pump 18;

[0022] As Figure 2 shown, the cooling sleeve 8 includes ring pipes on both sides and a number of transverse pipelines in the middle. Among the number of transverse pipelines, a number of arc-shaped branch pipes are arranged between adjacent transverse pipelines. All the number of annular cooling water pipes 6 are communicated with the first water inlet pipe 11 and the first water outlet pipe 13 through transverse branch pipes.

[0023] As Figure 4 shown, among the three parallel cooling water tanks 12, a water temperature sensor is arranged inside each cooling water tank 12, and a condenser 19 is installed on the outer side of each cooling water tank 12. One end of the condenser 19 is connected to a compressor 20. The compressor 20 is connected to an evaporator 23 in series through a pipeline with an expansion valve 22. The evaporator 23 is connected to the other end of the condenser 19 in series through a pipeline with a liquid storage tank 21. Control panels are arranged on the upper surfaces of the three parallel cooling water tanks 12. The control panels are respectively connected to the compressor 20 and the water temperature sensor through circuits;

[0024] Specifically, in this application, the compressor 20 can be controlled to operate through the control panel, and the temperature of the cooling circulating water inside different cooling water tanks 12 can be controlled through the condenser 19. Different zone temperatures are set according to different raw material and flame retardant mixture ratios, and then through the structure of the spaced annular cooling water pipes 6 arranged on the inner arc surface of the feeding end of the feeding hopper 5, the mixture inside the feeding hopper 5 is cooled step by step in sequence, which can effectively prevent the heat on the side of the feeding hopper barrel from being transferred to the thrust bearing and the speed reducer. The annular cooling water pipes 6 can better cover the annular area on the barrel side, and the cooling effect is better; a spiral cooling water pipe 7 is embedded inside the end seat at the discharging end of the feeding hopper 5 to continuously slightly reduce the cooling effect on the mixture for heating the material to promote later melting; by designing a cooling sleeve 8 structure with a ring pipe, several transverse pipelines, and several arc-shaped branch pipes, the rear end of the melting section of the extrusion cylinder body 3 is wrapped and cooled in all directions, so that the mixture maintains a relatively high viscosity, prevents the material from overheating and dispersing, and realizes low-temperature extrusion.

[0025] The standard parts used in this utility model can all be purchased from the market. The special-shaped parts can be customized according to the descriptions in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be elaborated here.

[0026] The above shows and describes the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of this utility model. Without departing from the spirit and scope of this utility model, this utility model will have various changes and improvements, and all these changes and improvements fall within the scope of this utility model claimed. The scope of protection claimed by this utility model is defined by the appended claims and their equivalents.

Claims

1. A cooling water tank structure for a flame-retardant and environmentally friendly plastic packaging bag extruder, comprising an extruder base, a transmission housing is arranged above the base, a driving motor is connected to the rear of the transmission housing, a feed hopper is connected to the top of the transmission housing, an extrusion screw is connected to the front of the transmission housing, an extrusion barrel is sleeved on the periphery of the extrusion screw, and a protective shell is arranged on the outside of the extrusion barrel, characterized in that: A plurality of annular cooling water pipes are arranged on the arc-shaped inner side surface of the feeding end of the feed hopper at intervals from top to bottom, and the left and right sides of the plurality of annular cooling water pipes are connected with a first water inlet pipe and a first water outlet pipe through pipelines, a spiral cooling water pipe is embedded in the end seat of the feeding end of the feed hopper, and the upper and lower ends of the spiral cooling water pipe are respectively connected with a second water inlet pipe and a second water outlet pipe, a cooling sleeve is installed around the rear end of the melting section of the extrusion cylinder, and the front and rear ends of the cooling sleeve are respectively connected with a third water inlet pipe and a third water outlet pipe, and three parallel cooling water troughs are installed above the machine base through a bracket.

2. The cooling water tank structure for a flame-retardant and environmentally friendly plastic packaging bag extruder according to claim 1, characterized in that: Among the three parallel cooling water tanks, the cooling water tank located on the far left is connected to the third water inlet pipe at one end and connected to the circulation pipeline at the other end, the cooling water tank located in the middle is connected to the second water inlet pipe at one end and connected to the circulation pipeline at the other end, the cooling water tank located on the far right is connected to the first water inlet pipe at one end and connected to the circulation pipeline at the other end, the first water outlet pipe, the second water outlet pipe and the third water outlet pipe are all connected to the inside of the circulating water tank, and the circulating water tank is externally connected to a circulating water pump.

3. The cooling water tank structure for a flame-retardant and environmentally friendly plastic packaging bag extruder according to claim 2 is characterized in that: Among the three parallel cooling water tanks, each cooling water tank is provided with a water temperature sensor and a condenser is installed on the outer side of each cooling water tank. One end of the condenser is connected to the compressor, and the compressor is connected to the evaporator through a pipeline series expansion valve, and the evaporator is connected to the other end of the condenser through a pipeline series liquid storage tank.

4. The cooling water tank structure for a flame-retardant and environmentally friendly plastic packaging bag extruder according to claim 3 is characterized by: The cooling jacket comprises annular pipes on both sides and a plurality of transverse pipes in the middle, wherein a plurality of arc-shaped branch pipes are arranged between adjacent transverse pipes among the plurality of transverse pipes, and the plurality of annular cooling water pipes are connected to the first water inlet pipe and the first water outlet pipe through the transverse branch pipes.

5. The cooling water tank structure for a flame-retardant and environment-friendly plastic packaging bag extruder according to claim 4, characterized in that: The upper surfaces of the three parallel cooling water tanks are all provided with control panels, and the control panels are respectively connected with the compressor and the water temperature sensor through lines.

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