Heating system for PET feeding

Abstract

The utility model relates to the technical field of extruder feeding, in particular to a PET feeding heating system which comprises a circulating pipe, one end of the circulating pipe is connected with an air outlet of a vacuum pump, the other end of the circulating pipe communicates with the interior of a feeding hopper, and the circulating pipe is used for transferring heat generated by the air outlet of the vacuum pump to the interior of the feeding hopper. In this way, raw materials entering the feeding hopper can be heated, the fluidity of the PET raw materials is relatively high at the high temperature, the efficiency is higher when the raw materials are conveyed into the extruder through the threaded conveyor, and the purpose of improving the raw material conveying efficiency is achieved.

Description

Technical Field

[0001] This application relates to the field of extruder feeding technology, and in particular to a heating system for PET feeding. Background Technology

[0002] Currently, extruders are commonly used when processing PET materials. The working principle of an extruder is mainly to use the rotation of the screw to heat, pressurize, and shear the material inside the barrel, thereby transforming the solid material into a uniform melt, and finally extruding it from the die to form a shape.

[0003] Extruders are typically equipped with a feed hopper, which is used to receive raw materials and transfer them into the machine body. For existing PET materials, vacuum feeding hoppers are usually used when feeding the extruder.

[0004] Existing vacuum hoppers are usually connected to a vacuum pump. The vacuum pump creates a negative pressure environment inside the hopper, forming a pressure difference between the external atmospheric pressure and the pressure inside the hopper. Under the action of this pressure difference, the raw material is sucked into the hopper. The side wall of the hopper is equipped with a feeding pipe, the other end of which is connected to the raw material tank. Under the action of the pressure difference, the raw material in the raw material tank is sucked into the hopper.

[0005] Furthermore, the bottom wall of the existing feeding hopper is usually provided with a discharge port, and the inside of the feeding hopper is usually also equipped with a screw conveyor, which is used to output the raw materials in the feeding hopper through the discharge port.

[0006] The existing technical solutions mentioned above have the following drawbacks: PET raw materials have relatively poor fluidity at room temperature, especially in granular form, resulting in low conveying efficiency when the screw conveyor inside the hopper transports them to a designated location. Utility Model Content

[0007] This application provides a heating system for PET feeding to improve the material conveying efficiency when using a hopper to convey materials into the feed hopper of an extruder.

[0008] The above-mentioned technical objective of this application is achieved through the following technical solution:

[0009] A heating system for PET feeding includes a circulation pipe, one end of which is connected to the air outlet of a vacuum pump, and the other end is connected to the inside of the feeding hopper. The circulation pipe is used to transfer the heat generated by the air outlet of the vacuum pump to the inside of the feeding hopper.

[0010] By adopting the above scheme, the vacuum pump creates a vacuum in the feeding hopper, and the raw material in the raw material barrel is then transported to the feeding hopper through the feeding pipe under the action of the pressure difference. Then, the raw material in the feeding hopper is transported to the extruder's feed hopper by the action of the threaded conveyor. Because a circulation pipe is set up, the airflow generated by the vacuum pump outlet carries heat, and the circulation pipe can transfer this heat to the feeding hopper. This can heat the raw material entering the feeding hopper. PET raw material has relatively strong fluidity at high temperatures, so the efficiency of conveying the raw material to the extruder by the threaded conveyor is higher, thus achieving the purpose of improving the efficiency of raw material conveying.

[0011] Furthermore, a cavity is provided on the periphery of the feeding hopper, and an air supply pipe is provided in the cavity. The air supply pipe is spirally wound inside the cavity. The end of the circulation pipe away from the vacuum pump passes through the outer wall of the cavity and is connected to the starting end of the air supply pipe. The tail end of the air supply pipe penetrates the inner wall of the cavity to the inside of the feeding hopper.

[0012] By adopting the above scheme and setting the air supply pipe, the hot air output from the vacuum pump outlet can circulate evenly inside the cavity, making the raw materials inside the feeding hopper more evenly heated.

[0013] Furthermore, buffer pads are provided on the two opposite side walls inside the cavity, and the two sides of the air supply pipe abut against the two buffer pads respectively. The buffer pads are used to protect the air supply pipe.

[0014] By adopting the above solution, the buffer pad can protect the feed pipe.

[0015] Furthermore, a baffle plate is provided at the tail end of the air supply pipe, and several ventilation holes are provided on the baffle plate. The baffle plate is fixedly connected to the tail end of the air supply pipe, and the baffle plate is used to prevent raw materials inside the feeding hopper from entering the air supply pipe.

[0016] By adopting the above solution, the baffle plate ensures that the airflow in the air supply pipe can enter the hopper while preventing the raw materials inside the hopper from entering the air supply pipe.

[0017] Furthermore, a heat-conducting pipe is also connected to the circulation pipe, and a hot air blower is connected to the end of the heat-conducting pipe away from the circulation pipe; a control valve is also connected to the heat-conducting pipe, and the control valve is used to control the opening and closing of the heat-conducting pipe.

[0018] By adopting the above scheme, when the vacuum pump starts working and the airflow produced by the air outlet is not hot enough, the hot air blower and control valve are turned on, and the hot air blower can provide heat to the air outlet through the circulation pipe.

[0019] Furthermore, a connector is provided between the circulation pipe and the air outlet of the vacuum pump. The diameter of the connector gradually decreases from the middle to both ends. The connector is used to connect the vacuum pump and the circulation pipe.

[0020] Furthermore, a discharge pipe is connected to the discharge port of the feeding hopper, and the discharge pipe is used to insert into the feed hopper of the extruder; a protective cover is connected to the bottom end of the discharge pipe away from the feeding cylinder, the protective cover is funnel-shaped, the small diameter end of the protective cover is connected to the discharge pipe, and the large diameter end of the protective cover covers the feed hopper of the extruder.

[0021] By adopting the above solution, the protective cover can be installed on the feed hopper of the extruder. The protective cover can prevent the raw materials entering the feed hopper of the extruder through the feed hopper from escaping, thus avoiding material waste.

[0022] Furthermore, a heat insulation layer is provided around the outside of the circulation pipe, and the heat insulation layer is bolted to the outer wall of the circulation pipe.

[0023] By adopting the above solution, the insulation layer can reduce heat loss during the process of transporting the heat generated by the vacuum pump's air outlet to the air supply pipe through the circulation pipe.

[0024] In summary, this application has the following technical effects:

[0025] 1. By setting up this system, the airflow generated by the vacuum pump outlet will carry heat, and the circulation pipe can transfer this heat to the feeding hopper. This can heat the raw materials entering the feeding hopper. PET raw materials have relatively strong fluidity at high temperatures, so the efficiency of conveying the raw materials into the extruder by the screw conveyor is higher, thus achieving the purpose of improving the efficiency of conveying raw materials.

[0026] 2. By setting up an air supply pipe, the hot air output from the vacuum pump outlet can circulate evenly inside the cavity, making the raw materials inside the feeding hopper more evenly heated.

[0027] 3. By setting up a buffer pad, the feed pipe can be protected. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of a heating system for PET feeding according to this application;

[0029] Figure 2 This is a cross-sectional view of the interior of the hopper in this application;

[0030] Figure 3 This is a schematic diagram of the structure of the tail end of the feed pipe inside the hopper of this application;

[0031] Figure 4 This is a schematic diagram of the connection between the circulation pipe and the protective layer.

[0032] In the diagram, 1 is the feeding hopper; 11 is the buffer pad; 2 is the vacuum pump; 3 is the raw material barrel; 4 is the feeding pipe; 5 is the heating component; 51 is the circulation pipe; 511 is the protective layer; 52 is the connector; 53 is the air supply pipe; 531 is the baffle plate; 6 is the heat conduction component; 61 is the hot air blower; 62 is the heat conduction pipe; 63 is the control valve; 7 is the discharging component; 71 is the discharging pipe; and 72 is the protective cover. Detailed Implementation

[0033] The existing vacuum hopper has the following structure:

[0034] Reference Figure 1 A vacuum pump 2 is installed on the top wall of the feeding hopper 1, and the vacuum pump 2 is connected to the feeding hopper 1. A feeding port is opened on the side wall of the feeding hopper 1, and a feeding pipe 4 is connected to the feeding port. The end of the feeding pipe 4 away from the feeding port is inserted into the raw material barrel 3. Under the action of the vacuum pump 2, a pressure difference is formed inside and outside the feeding hopper 1, and then the raw material in the raw material barrel 3 is sucked into the feeding hopper 1 through the feeding pipe 4.

[0035] Reference Figure 1 The feed hopper 1 is equipped with a screw conveyor inside and a discharge port is opened on the bottom wall. The screw conveyor can output the raw materials inside the feed hopper 1 to the designated position through the discharge port.

[0036] The present application will be further described in detail below with reference to the accompanying drawings.

[0037] Reference Figure 1 This embodiment provides a heating system for PET feeding, including a heating component 5 and a heat-conducting component 6. The heating component 5 is disposed between the air outlet of the vacuum pump 2 and the feeding hopper 1, with both ends of the heating component 5 connected to the air outlet of the vacuum pump 2 and the feeding hopper 1, respectively. The heating component 5 is used to transfer the heat of the airflow generated by the air outlet of the vacuum pump 2 to the interior of the feeding hopper 1, thereby increasing the activity of the raw materials inside the feeding hopper 1 and facilitating the use of a screw conveyor to transport the raw materials in the feeding hopper 1 to a designated location through the discharge port. The heat-conducting component 6 is connected to the heating component 5 and is used to assist the heating component 5 in transferring heat to the interior of the feeding hopper 1 when the airflow temperature generated by the air outlet of the vacuum pump 2 is insufficient.

[0038] Reference Figures 1-2 and Figure 4The heating assembly 5 includes a circulation pipe 51, a connector 52, and an air supply pipe 53. The circulation pipe 51 is disposed between the air outlet of the vacuum pump 2 and the feeding hopper 1. The connector 52 is disposed between the air outlet of the vacuum pump 2 and the circulation pipe 51. One end of the connector 52 completely covers the air outlet of the vacuum pump 2 and is fixedly connected to the vacuum pump 2. The other end of the connector 52 is fixedly connected to the circulation pipe 51, allowing the circulation pipe 51 to communicate with the air outlet of the vacuum pump 2. A cavity is formed in the circumferential side wall of the feeding hopper 1, and the air supply pipe 53 is embedded in the cavity. The air supply pipe 53 is spirally wound inside the cavity; the end of the circulation pipe 51 facing away from the connector 52 is inserted into the cavity and connected to the starting end of the air supply pipe 53; the tail end of the air supply pipe 53 penetrates the inner wall of the cavity to the inside of the feeding hopper 1; in this embodiment, the connector 52 has the largest diameter in the middle and gradually decreases towards the circulation pipe 51 and the vacuum pump 2; in this embodiment, the outer wall of the circulation pipe 51 is provided with a heat insulation layer 511, which is spirally wrapped around the outer wall of the circulation pipe 51 and is made of glass wool.

[0039] Reference Figure 3 A baffle plate 531 is fixedly connected to the end of the air supply pipe 53. The baffle plate 531 has several ventilation holes. The baffle plate 531 is set to ensure that the airflow in the air supply pipe 53 can enter the inside of the feeding hopper 1, while also preventing the raw materials inside the feeding hopper 1 from entering the air supply pipe 53.

[0040] Reference Figure 2 Both sides of the inner wall of the cavity are fixedly connected with buffer pads 11, and both sides of the air supply pipe 53 abut against the buffer pads 11. The buffer pads 11 can protect the air supply pipe 53. In this embodiment, the buffer pads 11 are preferably thermally conductive silicone sheets, which have good elasticity and thermal conductivity.

[0041] Reference Figure 1A frame is installed on the working surface, and the frame is fixedly connected to the working surface. The frame supports the feeding hopper 1, so that the discharge port of the feeding hopper 1 corresponds to the feed port of the extruder. The heat conduction component 6 includes a hot air blower 61, a heat conduction pipe 62, and a control valve 63. The hot air blower 61 is installed on the frame and fixedly connected to the frame. The heat conduction pipe 62 is installed between the hot air blower 61 and the circulation pipe 51, and its two ends are respectively connected to the hot air blower 61 and the circulation pipe 51. The control valve 63 is installed on the heat conduction pipe 62, and the control valve 63 is used for... The control valve 63 and the hot air blower 61 are activated when the vacuum pump 2 starts working. The hot air blower 61 transfers heat to the air supply pipe 53 through the heat conduction pipe 62 and the circulation pipe 51, thereby increasing the temperature of the air supply pipe 53 and heating the raw materials inside the feeding hopper 1. After the vacuum pump 2 has been working for a period of time, the hot air blower 61 and the control valve 63 are turned off, and the airflow generated at the outlet of the vacuum pump 2 is transferred to the air supply pipe 53 through the circulation pipe 51.

[0042] Reference Figure 1 A feeding assembly 7 is also provided corresponding to the feeding port of the feeding hopper 1. The feeding assembly 7 includes a feeding pipe 71 and a protective cover 72. One end of the feeding pipe 71 is connected to the feeding port of the feeding hopper 1, and the other end is connected to the protective cover 72. In this embodiment, the protective cover 72 is trumpet-shaped. The small-diameter end of the protective cover 72 is connected to the feeding port, and the large-diameter end of the protective cover 72 is used to cover the top wall of the extruder feed hopper. The setting of the protective cover 72 can reduce the problem of raw material overflow during the feeding process of the feeding hopper 1 to the extruder.

[0043] The specific implementation principle of the heating system for PET feeding in this embodiment is as follows: When the vacuum pump 2 starts working, if the heat generated by the airflow from the outlet of the vacuum pump 2 is insufficient, the control valve 63 and the hot air blower 61 are activated. The hot air blower 61 transfers heat to the air supply pipe 53 through the heat conduction pipe 62 and the circulation pipe 51, thereby increasing the temperature of the air supply pipe 53 and heating the raw materials inside the feeding hopper 1. After the vacuum pump 2 has been working for a period of time, the hot air blower 61 and the control valve 63 are turned off. The circulation pipe 51 transfers the heated airflow generated by the outlet of the vacuum pump 2 to the air supply pipe 53, thereby increasing the temperature of the air supply pipe 53. The increase in temperature of the air supply pipe 53 can increase the temperature of the inner wall of the feeding hopper 1, thereby heating the raw materials inside the feeding hopper 1, increasing the activity of the raw materials, and making it easier for the screw conveyor to output the raw materials inside the feeding hopper 1 through the discharge port into the discharge pipe 71, and finally into the feeding hopper 1 of the extruder.

[0044] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A heating system for PET feeding, characterized in that: Includes a circulation pipe (51), one end of which is connected to the air outlet of the vacuum pump (2), and the other end is connected to the inside of the feeding hopper (1). The circulation pipe (51) is used to transfer the heat generated by the air outlet of the vacuum pump (2) to the inside of the feeding hopper (1).

2. The heating system for PET feeding according to claim 1, characterized in that: The hopper (1) has a cavity on its periphery, and an air supply pipe (53) is installed inside the cavity. The air supply pipe (53) is spirally wound inside the cavity. The end of the circulation pipe (51) away from the vacuum pump (2) passes through the outer wall of the cavity and is connected to the starting end of the air supply pipe (53). The tail end of the air supply pipe (53) penetrates the inner wall of the cavity to the inside of the hopper (1).

3. The heating system for PET feeding according to claim 2, characterized in that: The cavity has two opposing side walls with buffer pads (11) installed. The two sides of the air supply pipe (53) abut against the two buffer pads (11) respectively. The buffer pads (11) are used to protect the air supply pipe (53).

4. A heating system for PET feeding according to claim 2, characterized in that: The tail end of the air supply pipe (53) is provided with a baffle plate (531). The baffle plate (531) has several ventilation holes. The baffle plate (531) is fixedly connected to the tail end of the air supply pipe (53). The baffle plate (531) is used to prevent the raw materials inside the feeding hopper (1) from entering the air supply pipe (53).

5. A heating system for PET feeding according to claim 1, characterized in that: A heat-conducting pipe (62) is also connected to the circulation pipe (51), and a hot air blower (61) is connected to one end of the heat-conducting pipe (62) away from the circulation pipe (51); a control valve (63) is also connected to the heat-conducting pipe (62), and the control valve (63) is used to control the opening and closing of the heat-conducting pipe (62).

6. The heating system for PET feeding according to claim 1, characterized in that: A connector (52) is provided between the circulation pipe (51) and the air outlet of the vacuum pump (2). The diameter of the connector (52) gradually decreases from the middle to both ends. The connector (52) is used to connect the vacuum pump (2) and the circulation pipe (51).

7. A heating system for PET feeding according to claim 1, characterized in that: The feeding hopper (1) is connected to a feeding pipe (71) at its feeding port. The feeding pipe (71) is used to insert into the feed hopper of the extruder. The bottom end of the feeding pipe (71) away from the feeding cylinder is connected to a protective cover (72). The protective cover (72) is trumpet-shaped. The small-diameter end of the protective cover (72) is connected to the feeding pipe (71), and the large-diameter end of the protective cover (72) is covered on the feed hopper of the extruder.

8. A heating system for PET feeding according to claim 1, characterized in that: A heat insulation layer is provided around the outside of the circulation pipe (51), and the heat insulation layer is bolted to the outer wall of the circulation pipe (51).

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