Efficient vacuum drying tank

Abstract

The utility model discloses an efficient vacuum drying tank, which comprises a tank body, a hot air convection device and a vacuum control valve, the tank body is further provided with a feed port for feeding materials and a discharge port for discharging the materials, the feed port and the discharge port are respectively provided with a first opening and closing device and a second opening and closing device, and the efficient vacuum drying tank further comprises a hot air convection device and a vacuum control valve. A heating air duct is arranged at the bottom of the tank body, the hot air convection device conveys hot air into the tank body through the heating air duct, a convection opening is further formed in the tank body, and a third opening and closing device used for controlling the inside and the outside of the tank body to be communicated or blocked is installed on the convection opening. The vacuum control valve is installed on the tank body and used for being connected with an external vacuumizing device. The plastic raw material drying device can obviously improve the drying efficiency of plastic raw materials, and has the advantage of energy conservation.

Description

Technical Field

[0001] The utility model relates to the technical field of drying equipment, in particular to a high-efficiency vacuum drying tank. Background Art

[0002] Nowadays, there are many drying devices for various industries on the market. In the drying process of plastics, drying devices with good drying effect and fast speed often play a great role.

[0003] The utility model patent with patent number CN207874627U discloses a plastic raw material drying device, the core of which is to transmit hot air from the hot air pipe to the inside of the lower barrel through a blower and an electric heating pipe, and to dry the plastic inside the mixing barrel with hot air, thereby improving the drying efficiency. However, this structure performs the drying operation under normal pressure, and usually requires continuous drying for 4 to 8 hours, which is not only inefficient, but also consumes a lot of energy. Therefore, it is necessary to improve the existing plastic raw material drying device. Utility Model Content

[0004] The purpose of the utility model is to provide a high-efficiency vacuum drying tank, which can significantly improve the drying efficiency of plastic raw materials and has the advantage of energy saving.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-efficiency vacuum drying tank, comprising a tank body, the tank body is also provided with a feed port for material entry and a discharge port for material discharge, the feed port and the discharge port are respectively provided with a first opening and closing device and a second opening and closing device, and also includes a hot air convection device and a vacuum control valve, a heating air duct is provided at the bottom of the tank body, the hot air convection device transports hot air to the inside of the tank body through the heating air duct, the tank body is also provided with a convection port, the convection port is installed with a third opening and closing device for controlling conduction or blocking inside and outside the tank body, and the vacuum control valve is installed on the tank body for connecting to an external vacuum pumping device.

[0006] By adopting the above technical scheme, hot air is first sent into the tank body through the hot air convection device, and a convection that runs through the depth direction of the material is formed by utilizing the heating air duct and the upper and lower position design of the convection port on the tank body. After the hot air is dried for a period of time, the third opening and closing device on the docking port is closed, and the hot air convection device is closed at the same time, and the vacuum control valve is opened. The external vacuum pumping device works to perform a vacuum pumping process on the inside of the tank body. The boiling point of water is about 51°C at 0.1 atmospheric pressure inside the tank body. The water in the material evaporates faster at the same temperature, that is, the water in the material evaporates quickly. The overall drying time is only between 30 minutes and 40 minutes, which can significantly improve the drying efficiency of plastic raw materials and has the advantage of energy saving.

[0007] The utility model is further configured such that the hot air convection device includes a hot air dryer, the air inlet of the hot air dryer is arranged in the external space of the tank body, the air outlet of the hot air dryer is connected to the heating air duct, and the heating air duct is also equipped with a fourth opening and closing device for controlling the opening and closing of the heating air duct.

[0008] By adopting the above technical scheme, air can be supplied to the inside of the tank through a hot air dryer, and a fourth opening and closing device is installed on the heating air duct, which can be opened when supplying air to make the heating air duct conductive to achieve air supply, and closed when vacuuming to prevent external air from entering the heating air duct, thereby providing support for the vacuuming process.

[0009] The utility model is further configured such that the hot air convection device also includes a hot air recovery device, a hot air recovery interface is provided on the tank body, a fifth opening and closing device for controlling the on and off of the hot air recovery interface is provided on the hot air recovery interface, one end of the hot air recovery device is connected to the hot air recovery interface through a first pipe, and the other end of the hot air recovery device is connected to the air inlet of the hot air dryer through a second pipe.

[0010] By adopting the above technical solution, a hot air recovery cycle can be achieved through a hot air recovery device, which has a more energy-saving effect.

[0011] The utility model is further configured that a vacuum gauge for detecting the internal pressure of the tank body is also installed on the tank body.

[0012] By adopting the above technical solution, a vacuum gauge is arranged on the tank body to facilitate observation of the internal pressure. When the vacuum degree reaches the standard, the vacuum control valve is used to promptly stop the external vacuum device from vacuuming the inside of the tank body.

[0013] The utility model is further configured that the tank body is also equipped with a circulating mixing mechanism for continuously conveying the material in the bottom of the tank body to the upper part of the tank body.

[0014] By adopting the above technical solution and arranging a circulating mixing mechanism on the tank body to perform spiral stirring on the material, the material in each part can be dried more evenly.

[0015] The utility model is further configured as follows: the circulating mixing mechanism includes a driving member, a stirring shaft and a spiral stirring paddle; a bracket is provided at the upper end of the tank body, the driving member is installed on the bracket, the stirring shaft is arranged in the tank body, and one end of the stirring shaft passes through the tank body and is linked to the output end of the driving member, the other end of the stirring shaft extends to the tank body discharge port position, the spiral stirring paddle is spirally arranged on the stirring shaft along the axial direction, and the bottom end of the spiral stirring paddle also extends to the tank body discharge port position.

[0016] By adopting the above technical solution, during operation, the undried material at the bottom of the tank body can be continuously transported to the upper part of the tank body for cyclic heating and drying. The internal circulation and material stirring are carried out simultaneously, which not only improves the drying efficiency but also makes the material in each part dry more evenly.

[0017] The utility model is further configured that the driving member is a driving motor, and the motor shaft of the driving member is linked to the stirring shaft.

[0018] By adopting the above technical solution, a drive motor is used as a driving member to drive the stirring shaft and the spiral stirring paddle to rotate. Not only is the product price low and easy to purchase, but the drive motor and the stirring shaft can be linked through a coupling, and assembly and production are very convenient.

[0019] The utility model is further configured that a partition is also provided in the tank body, and the partition divides the interior of the tank body into a material heating and storage area and a material storage area after drying. The discharge port is arranged on the partition, and the heating air duct is connected with the material heating and storage area. A discharge pipe connected with the material storage area after drying is provided at the bottom of the tank body, and a sixth opening and closing device for controlling the discharge pipe to be opened and closed is provided on the discharge pipe.

[0020] By adopting the above technical solution, a storage area for materials after drying is added to the tank body, so that the tank can be directly installed on the injection molding machine for use, which is very convenient to use.

[0021] The utility model is further configured such that the partition and the bottom of the tank body are both in a conical shape that is larger at the top and smaller at the bottom.

[0022] By adopting the above technical solution, the material can be guided so that the material can move downward more easily.

[0023] The utility model is further configured such that the first opening and closing device, the second opening and closing device, the third opening and closing device, the fourth opening and closing device, the fifth opening and closing device, and the sixth opening and closing device are all electric butterfly valves.

[0024] By adopting the above technical solutions, electric butterfly valve control has the advantages of precise control, rapid response, versatility, high reliability, energy saving and environmental protection, and remote control, and is suitable for the automated control of various fluid systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1 of the utility model;

[0026] Figure 2 It is a schematic diagram of the overall structure of Embodiment 2 of the present utility model;

[0027] Figure 3 It is a schematic diagram of the overall structure of Embodiment 3 of the present utility model;

[0028] Figure 4 It is a schematic diagram of the overall structure of Embodiment 4 of the present utility model;

[0029] Figure 5 It is a schematic diagram of the overall structure of Example 5 of the utility model.

[0030] In the figure: 1. tank body; 2. feed port; 3. discharge port; 4. first opening and closing device; 5. second opening and closing device; 6. hot air convection device; 7. vacuum control valve; 8. heating air duct; 9. convection port; 10. third opening and closing device; 11. hot air dryer; 12. fourth opening and closing device; 13. hot air recovery device; 14. hot air recovery interface; 15. fifth opening and closing device; 16. first pipeline; 17. second pipeline; 18. vacuum gauge; 19. circulating mixing mechanism; 20. driving part; 21. stirring shaft; 22. spiral stirring paddle; 23. bracket; 24. partition; 25. material heating storage area; 26. material storage area after drying; 27. discharge pipe; 28. sixth opening and closing device; 29. ​​power supply and control box. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] The present invention is described in detail below through five specific implementation modes:

[0033] Embodiment 1: As attached Figure 1A high-efficiency vacuum drying tank shown in the figure includes a tank body 1, which is composed of a bottom tank and a top cover, and the two are connected together by a clamp. The tank body 1 is also provided with a feed port 2 for material entry and a discharge port 3 for material discharge, and the feed port 2 and the discharge port 3 are respectively provided with a first opening and closing device 4 and a second opening and closing device 5, and also includes a hot air convection device 6 and a vacuum control valve 7. A heating air duct 8 is provided at the bottom of the tank body 1, and the hot air convection device 6 transports hot air to the inside of the tank body 1 through the heating air duct 8. The tank body 1 is also provided with a convection port 9, and a third opening and closing device 10 for controlling the conduction or blocking between the inside and outside of the tank body 1 is installed on the convection port 9. The vacuum control valve 7 is installed on the tank body 1 for connecting with an external vacuum pumping device, wherein the external vacuum pumping device is a vacuum pump. First, hot air is sent into the tank body 1 through the hot air convection device 6, and a convection that penetrates the material in the depth direction is formed by utilizing the upper and lower position design of the heating air duct 8 and the convection port 9 on the tank body 1. After the hot air is dried for a period of time, the third opening and closing device 10 on the docking port is closed, and the hot air convection device 6 is closed at the same time, and the vacuum control valve 7 is opened. The external vacuum pumping device works to perform a vacuum pumping process on the inside of the tank body 1. The boiling point of water is about 51°C at 0.1 atmospheric pressure inside the tank body 1. The water in the material evaporates faster at the same temperature, that is, the water in the material evaporates quickly. The overall drying time only takes between 30min and 40min, which can significantly improve the drying efficiency of plastic raw materials and has the advantage of energy saving.

[0034] As attached Figure 1 As shown, the hot air convection device 6 includes a hot air dryer 11, the air inlet of the hot air dryer 11 is arranged in the external space of the tank body 1, the air outlet of the hot air dryer 11 is connected to the heating air duct 8, and the heating air duct 8 is also equipped with a fourth opening and closing device 12 for controlling the opening and closing of the heating air duct 8. The hot air dryer 11 can be used to supply air to the inside of the tank body 1, and the fourth opening and closing device 12 is installed on the heating air duct 8, which can be opened when supplying air to make the heating air duct 8 conductive to achieve air supply, and closed when vacuuming to prevent external air from entering the heating air duct 8, providing support for the vacuuming process.

[0035] As attached Figure 1 As shown, the tank body 1 is also equipped with a vacuum gauge 18 for detecting the internal pressure of the tank body 1. The vacuum gauge 18 is arranged on the tank body 1 to facilitate observation of the internal pressure, and when the vacuum degree reaches the standard, the external vacuum device is stopped from vacuuming the inside of the tank body 1 in time through the vacuum control valve 7.

[0036] Embodiment 2: As attached Figure 2As shown, on the basis of Example 1, the hot air convection device 6 in this embodiment also includes a hot air recovery device 13, and a drying device can be installed in front of the hot air recovery device 13 to absorb moisture in the air flow to improve the drying efficiency. The tank body 1 is provided with a hot air recovery interface 14, and the hot air recovery interface 14 is provided with a fifth opening and closing device 15 for controlling the hot air recovery interface 14 to be turned on and off. One end of the hot air recovery device 13 is connected to the hot air recovery interface 14 through a first pipe 16, and the other end of the hot air recovery device 13 is connected to the air inlet of the hot air dryer 11 through a second pipe 17. Through the hot air recovery device 13, hot air recovery circulation can be realized, which has a more energy-saving effect.

[0037] Embodiment 3: As attached Figure 3 As shown, on the basis of Example 2, in this embodiment, the tank body 1 is further provided with a circulating mixing mechanism 19 for continuously conveying the material at the bottom of the tank body 1 to the upper part of the tank body 1. By providing the circulating mixing mechanism 19 on the tank body 1, the material is spirally stirred, so that the material in each part can be dried more evenly.

[0038] As attached Figure 3 As shown, the circulating mixing mechanism 19 includes a driving member 20, a stirring shaft 21 and a spiral stirring paddle 22. A bracket 23 is provided at the upper end of the tank body 1, and the driving member 20 is mounted on the bracket 23. The stirring shaft 21 is arranged in the tank body 1, and one end of the stirring shaft 21 passes through the tank body 1 and is linked to the output end of the driving member 20. The other end of the stirring shaft 21 extends to the position of the discharge port 3 of the tank body 1. The spiral stirring paddle 22 is spirally arranged on the stirring shaft 21 along the axial direction, and the bottom end of the spiral stirring paddle 22 also extends to the position of the discharge port 3 of the tank body 1. During operation, the undried material at the bottom of the tank body 1 can be continuously transported to the upper part of the tank body 1 for circulating heating and drying. The internal circulation and material stirring are carried out simultaneously, which can not only improve the drying efficiency, but also make the material drying more uniform in each part.

[0039] The driving member 20 is a driving motor, and the motor shaft of the driving member 20 is linked to the stirring shaft 21. The driving motor is used as the driving member 20 to drive the stirring shaft 21 and the spiral stirring paddle 22 to rotate. Not only is the product price low and easy to purchase, but the driving motor and the stirring shaft 21 can be linked to each other through a coupling, and the assembly and production are very convenient.

[0040] Embodiment 4: As attached Figure 4As shown, the structure of this embodiment is different from that of the embodiment 1 in that: in this embodiment, a partition 24 is further provided inside the tank body 1, and the partition 24 is welded to the tank body 1, and the partition 24 divides the inside of the tank body 1 into a material heating storage area 25 and a material storage area 26 after drying, and the discharge port 3 is provided on the partition 24, and the heating air duct 8 is connected to the material heating storage area 25, and a discharge pipe 27 connected to the material storage area 26 after drying is provided at the bottom of the tank body 1, and a sixth opening and closing device 28 for controlling the opening and closing of the discharge pipe 27 is provided on the discharge pipe 27. The material storage area 26 after drying is added to the tank body 1, so that it can be directly installed on the injection molding machine for use, which is very convenient to use.

[0041] As attached Figure 4 As shown, the partition plate 24 and the bottom of the tank body 1 are both in a conical shape with a larger top and a smaller bottom. This design can guide the material and make it easier for the material to move downward.

[0042] Embodiment 5: As attached Figure 5 As shown, on the basis of Example 4, this embodiment adds a circulating mixing mechanism 19 on the tank body 1. The specific structure and working principle of the circulating mixing mechanism 19 are the same as those of Example 3, so they are not described in detail here.

[0043] In addition, in the above embodiments, the first opening and closing device 4, the second opening and closing device 5, the third opening and closing device 10, the fourth opening and closing device 12, the fifth opening and closing device 15, and the sixth opening and closing device 28 are all electric butterfly valves. Electric butterfly valve control has the advantages of precise control, rapid response, versatility, high reliability, energy saving and environmental protection, and remote control, and is suitable for the automatic control of various fluid systems. A power supply and control box 29 is installed on the side of the tank body 1 to provide power to each electrical appliance and to start and stop control.

Claims

1. A high-efficiency vacuum drying tank, comprising a tank body (1), the tank body (1) is further provided with a feed port (2) for material entry and a discharge port (3) for material discharge, the feed port (2) and the discharge port (3) are respectively provided with a first opening and closing device (4) and a second opening and closing device (5), characterized in that: The invention also comprises a hot air convection device (6) and a vacuum control valve (7). A heating air duct (8) is provided at the bottom of the tank body (1). The hot air convection device (6) transports hot air to the inside of the tank body (1) through the heating air duct (8). The tank body (1) is also provided with a convection port (9). A third opening and closing device (10) for controlling the conduction or blocking between the inside and outside of the tank body (1) is installed on the convection port (9). The vacuum control valve (7) is installed on the tank body (1) for connecting to an external vacuum pumping device. The hot air convection device (6) comprises a hot air dryer (11). The air inlet of the hot air dryer (11) is arranged in the external space of the tank body (1). The air outlet of the hot air dryer (11) is connected to the heating air duct (8). The heating air duct (8) is also provided with a fourth opening and closing device (12) for controlling the on and off of the heating air duct (8).

2. The high-efficiency vacuum drying tank according to claim 1, characterized in that: The hot air convection device (6) also includes a hot air recovery device (13); a hot air recovery interface (14) is provided on the tank body (1); a fifth opening and closing device (15) for controlling the hot air recovery interface (14) to be turned on and off is provided on the hot air recovery interface (14); one end of the hot air recovery device (13) is connected to the hot air recovery interface (14) via a first pipe (16); and the other end of the hot air recovery device (13) is connected to the air inlet of the hot air dryer (11) via a second pipe (17).

3. The high-efficiency vacuum drying tank according to claim 1, characterized in that: The tank body (1) is also provided with a vacuum gauge (18) for detecting the internal pressure of the tank body (1).

4. The high-efficiency vacuum drying tank according to claim 1, characterized in that: The tank body (1) is also provided with a circulating mixing mechanism (19) for continuously conveying the material at the bottom of the tank body (1) to the upper part of the tank body (1).

5. The high-efficiency vacuum drying tank according to claim 4, characterized in that: The circulating mixing mechanism (19) comprises a driving member (20), a stirring shaft (21) and a spiral stirring paddle (22); a bracket (23) is provided at the upper end of the tank body (1); the driving member (20) is mounted on the bracket (23); the stirring shaft (21) is arranged in the tank body (1); one end of the stirring shaft (21) passes through the tank body (1) and is linked to the output end of the driving member (20); the other end of the stirring shaft (21) extends to the position of the discharge port (3) of the tank body (1); the spiral stirring paddle (22) is spirally arranged on the stirring shaft (21) along the axial direction; and the bottom end of the spiral stirring paddle (22) also extends to the position of the discharge port (3) of the tank body (1).

6. The high-efficiency vacuum drying tank according to claim 5, characterized in that: The driving member (20) is a driving motor, and the motor shaft of the driving member (20) is linked to the stirring shaft (21).

7. The high-efficiency vacuum drying tank according to claim 2, characterized in that: The tank body (1) is further provided with a partition (24), the partition (24) dividing the interior of the tank body (1) into a material heating storage area (25) and a material storage area (26) after drying; the discharge port (3) is arranged on the partition (24); the heating air duct (8) is connected to the material heating storage area (25); a discharge pipe (27) connected to the material storage area (26) after drying is arranged at the bottom of the tank body (1); and a sixth opening and closing device (28) for controlling the opening and closing of the discharge pipe (27) is arranged on the discharge pipe (27).

8. The high-efficiency vacuum drying tank according to claim 7, characterized in that: The partition (24) and the bottom of the tank body (1) are both in a conical shape with a larger top and a smaller bottom.

9. The high-efficiency vacuum drying tank according to claim 7, characterized in that: The first opening and closing device (4), the second opening and closing device (5), the third opening and closing device (10), the fourth opening and closing device (12), the fifth opening and closing device (15), and the sixth opening and closing device (28) are all electric butterfly valves.

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