Spiral heating and drying process step in vacuum state

Abstract

The invention provides a spiral heating and drying process step in a vacuum state, and belongs to the technical field of spiral heating and drying. Comprising the following steps that S1, materials to be dried are added into a vacuum feeding tank to be temporarily stored, and the vacuum feeding tank is vacuumized to be in a vacuum state; s2, the spiral heating and drying device is vacuumized; s3, an external steam generating device is started, and hot steam is conveyed into a heating jacket and a hollow shaft rod of the spiral heating and drying device; and S4, the materials in the feeding tank are added into a spiral heating and drying device, the spiral heating and drying device is started to continuously and forwards transport the materials, and meanwhile the materials which are continuously and forwards transported are dried. Materials can be in a vacuum state in the whole drying process, the heating area of the materials is increased, and the drying efficiency is effectively improved; the materials can be dried in a sectional mode through the same motor, the comprehensive cost is effectively reduced, and the resource utilization rate is increased.

Description

Technical Field

[0001] The invention provides a spiral heating and drying process step in a vacuum state, belonging to the technical field of spiral heating and drying. Background Art

[0002] Spiral heating drying is an indirect heat transfer dryer that transfers the heat of the heat carrier to the wet material through the spiral groove and the metal wall of the spiral jacket, so that the moisture in it is vaporized and dried. It is suitable for drying materials that are not allowed to be contaminated or deteriorated, and is widely used in the fields of pharmaceutical intermediates, traditional Chinese medicine, sterile powder and food drying and processing.

[0003] The drying process steps of the existing spiral heating and drying device can basically meet normal use needs, but in the entire process, it is difficult for the material to be in a vacuum state at the same time during the feeding, conveying, heating, and discharging of the material, and the material is heated only by the heating jacket, and the heating area is relatively small, resulting in low efficiency when the material is dried; in the entire drying process, the traditional method is to continuously stack multiple spiral heating and drying devices with a single spiral shaft to achieve continuous segmented drying, which increases the overall cost and the resource utilization rate needs to be improved. Based on this, the present invention provides a spiral heating and drying process step in a vacuum state. Summary of the invention

[0004] In order to solve the problems existing in the background technology, the present invention provides a spiral heating and drying process step under a vacuum state, which can make the material in a vacuum state during the entire drying process, increase the heating area of ​​the material, and effectively improve the drying efficiency; by adopting the same motor, the material can be dried in sections, effectively reducing the overall cost and improving resource utilization.

[0005] The present invention provides a spiral heating and drying process step under a vacuum state, and the proposed technical solution is: comprising the following steps:

[0006] S1: Add the material to be dried into the vacuum feed tank for temporary storage, start the external vacuum pump, and evacuate the vacuum feed tank to make it in a vacuum state;

[0007] S2: Start the external vacuum pump to evacuate the spiral heating and drying device;

[0008] S3: Start the external steam generating device to transport the hot steam to the heating jacket and the hollow shaft of the spiral heating and drying device;

[0009] S4: adding the material to be dried temporarily stored in the vacuum feed tank to the spiral heating drying device, starting the spiral heating drying device to continuously transport the material forward, and drying the material being continuously transported forward;

[0010] S5: Collect the dried materials into a vacuum discharge tank, start an external vacuum pump, and evacuate the vacuum discharge tank to put it in a vacuum state.

[0011] The spiral heating and drying device includes an outer shell, in which a hollow shaft is symmetrically rotatably connected, an inner wall of the outer shell is provided with a partition plate placed between the hollow shafts, an outer wall of the outer shell is provided with a driving assembly for driving the hollow shaft to rotate, both ends of the hollow shaft pass through the side walls of the outer shell and are provided with rotating joints, a connected conveying pipe is provided between the rotating joints on one side, a vacuum port is provided on the side walls of the outer shell and is placed on both sides of the partition plate, the outer shell includes a shell body and a heating jacket arranged in the shell, and a conveying cavity connected to the heating jacket is provided inside the partition plate.

[0012] Furthermore, the vacuum feeding tank includes a tank body, a feeding port arranged on the top of the tank body, a discharging port arranged at the bottom of the tank body, and a vacuum suction port arranged on the side wall of the tank body. The vacuum feeding tank has the same structure as the vacuum discharging tank, and serves to keep the material in a vacuum state during feeding and discharging.

[0013] Furthermore, the side wall of the shell is provided with a connection port communicated with the heating jacket, and the side walls of both sides of the conveying cavity are provided with conveying ports communicated with the connection port.

[0014] Furthermore, the outer wall of the delivery pipe is provided with reinforcing ribs fixedly connected to the side wall of the shell.

[0015] Furthermore, the drive assembly includes a motor mounted on the outer wall of the shell, the output end of the motor is fixedly connected to a main pulley, the end of the hollow shaft is provided with a slave pulley placed outside the shell, and a matching belt is provided between the main pulley and the slave pulley.

[0016] Furthermore, the rotary joint on the other side is provided with interconnected heat inlet and outlet ports, one side of the shell is provided with a heat inlet connected to the heating jacket, and the other side of the shell is provided with a heat outlet connected to the heating jacket.

[0017] Furthermore, the upper hollow shaft is provided with a spiral blade 1, and the lower hollow shaft is provided with a spiral blade 2 which rotates in the opposite direction to the spiral blade 1.

[0018] Furthermore, an inlet is provided on one side of the top of the shell, an outlet is provided on the same side of the bottom of the shell, and a feed outlet is provided on the side of the partition plate away from the inlet.

[0019] The beneficial effects of the present invention are as follows: the present invention can keep the material in a vacuum state during the entire process of feeding, conveying, heating and discharging, and increase the heating area of ​​the material by allowing hot steam to enter the heating jacket, the hollow shaft rod and the partition plate, thereby effectively improving the drying efficiency; the material can be dried in sections by adopting the same motor, which effectively reduces the overall cost and improves the resource utilization rate compared to the traditional method of continuously superimposing multiple spiral heating and drying devices with a single spiral shaft to achieve continuous sectioned drying. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The structure of the present invention is schematically shown Figure 1 .

[0021] Figure 2 The structure of the present invention is schematically shown Figure 2 .

[0022] Figure 3 It is a plan view of the present invention.

[0023] Figure 4 It is a partial enlarged view of the present invention.

[0024] Figure 5 It is a schematic plan view of the partition plate of the present invention.

[0025] 1. Tank body; 2. Feed inlet; 3. Discharge outlet; 4. Shell; 5. Hollow shaft; 6. Partition plate; 7. Drive assembly; 8. Rotary joint; 9. Conveying pipe; 10. Heat inlet and outlet; 11. Vacuum outlet; 12. Shell; 13. Heating jacket; 14. Conveying cavity; 15. Connecting port; 16. Conveying port; 17. Reinforcement rib; 18. Motor; 19. Main pulley; 20. Slave pulley; 21. Belt; 22. Heat inlet; 23. Heat outlet; 24. Spiral blade 1; 25. Spiral blade 2; 26. Inlet; 27. Outlet; 28. Discharge port. DETAILED DESCRIPTION

[0026] The present invention is further described below in conjunction with the accompanying drawings.

[0027] The present invention provides a spiral heating and drying process under vacuum, comprising the following steps:

[0028] S1: Add the material to be dried into the vacuum feed tank for temporary storage, start the external vacuum pump, and evacuate the vacuum feed tank to make it in a vacuum state;

[0029] S2: Start the external vacuum pump to evacuate the spiral heating and drying device;

[0030] S3: Start the external steam generating device to transport the hot steam to the heating jacket and the hollow shaft of the spiral heating and drying device;

[0031] S4: adding the material to be dried temporarily stored in the vacuum feed tank to the spiral heating drying device, starting the spiral heating drying device to continuously transport the material forward, and drying the material being continuously transported forward;

[0032] S5: Collect the dried materials into a vacuum discharge tank, start an external vacuum pump, and evacuate the vacuum discharge tank to put it in a vacuum state.

[0033] According to the attached Figure 1 , 3 , 4, 5: The spiral heating and drying device includes a shell 4, a hollow shaft 5 is symmetrically connected to the shell 4, a partition plate 6 is arranged between the hollow shafts 5 on the inner side wall of the shell 4, both ends of the hollow shaft 5 pass through the side wall of the shell 4 and are provided with a rotating joint 8, a conveying pipe 9 is arranged between the rotating joints 8 on one side, and a reinforcing rib 17 is arranged on the outer wall of the conveying pipe 9 to be fixedly connected to the side wall of the shell 4, which plays a role in strengthening the fixation, the shell 4 includes a shell 12, a heating jacket 13 arranged in the shell 12, a conveying cavity 14 connected to the heating jacket 13 is arranged inside the partition plate 6, the side wall of the shell 12 is provided with a connecting port 15 connected to the heating jacket 13, and the side walls of the conveying cavity 14 are provided with a connecting port 15 connected to the heating jacket 13. The shell 12 is provided with a conveying port 16 connected with the opening 15, and the rotary joint 8 on the other side is provided with a connected heat inlet and outlet 10, a heat inlet 22 connected with the heating jacket 13 is provided on one side of the shell 12, and a heat outlet 23 connected with the heating jacket 13 is provided on the other side of the shell 12. By connecting the heat inlet and outlet 10, the heat inlet 22 and the heat outlet 23 with the external steam generating device respectively, hot steam enters the heating jacket 13 and the inside of the hollow shaft 5, and flows into the conveying cavity in the partition plate 6 through the conveying port 16 and the conveying cavity 14, so that every position where the material passes can contact the heat source and always keep in full contact with the heating body, so that the moisture in the material can continuously absorb heat and evaporate, so as to achieve the purpose of drying and dehydration and improve the drying efficiency.

[0034] According to the attached Figure 2 , 3 As shown: the side wall of the shell 4 is provided with a vacuum port 11 placed on both sides of the partition plate 6. By connecting the vacuum port 11 with an external vacuum pump, the external vacuum pump is started to evacuate the inside of the shell 4, so that the interior of the spiral heating and drying device is in a low-pressure vacuum state to dry the material, thereby causing the moisture in the material to continuously absorb heat and evaporate, thereby achieving the purpose of drying and dehydration.

[0035] According to the attached Figure 3As shown: the vacuum feeding tank includes a tank body 1, a feeding port 2 arranged on the top of the tank body 1, a discharging port 3 arranged at the bottom of the tank body 1, and a vacuum suction port arranged on the side wall of the tank body 1. The vacuum feeding tank has the same structure as the vacuum discharging tank, which makes the material in a vacuum state during feeding and discharging.

[0036] According to the attached Figure 1 , 3 5: a spiral blade 24 is provided on the upper hollow shaft 5, a spiral blade 25 with a rotation direction opposite to the spiral blade 24 is provided on the lower hollow shaft 5, an inlet 26 is provided on one side of the top of the shell 4, an outlet 27 is provided on the same side of the bottom of the shell 4, a discharge port 28 is provided on the side of the partition plate 6 away from the inlet 26, a driving assembly 7 for driving the hollow shaft 5 to rotate is provided on the outer wall of the shell 4, and the driving assembly 7 includes a motor 18 mounted on the outer wall of the shell 4, a main pulley 19 is fixedly connected to the output end of the motor 18, a slave pulley 20 is provided at the end of the hollow shaft 5 and is placed outside the shell 4, and a main pulley 19 is provided between the main pulley 19 and the slave pulley 20. There is a matching belt 21, which drives the main pulley 19 to rotate by starting the motor 18. With the cooperation of the belt 21, the slave pulley 20 is driven to rotate, and then the hollow shaft 5 is driven to rotate, and then the spiral blade 1 24 and the spiral blade 25 with opposite rotation directions are driven to rotate. The material is first continuously transported toward the discharge port 28 through the spiral blade 1 24, and then falls under the partition plate 6 through the discharge port 28, and continuously moves toward the outlet 27 through the spiral blade 25. During this transportation process, the material enters the spiral heating and drying device and is continuously pushed and stirred and dispersed through the spiral blade 1 24 and the spiral blade 25.

[0037] Working principle: Add the material to be dried into the vacuum feed tank for temporary storage, start the external vacuum pump, evacuate the vacuum feed tank to make it in a vacuum state; start the external vacuum pump, evacuate the spiral heating and drying device, so that the inside of the spiral heating and drying device is in a vacuum state; start the external steam generating device, and connect the heat inlet and outlet 10, the heat inlet 22, and the heat outlet 23 to the external steam generating device respectively, so that the hot steam enters the heating jacket 13, the hollow shaft 5, and the partition plate 6; add the material to be dried temporarily stored in the vacuum feed tank to the spiral heating and drying device, and drive the driving component 7 to drive the spiral heating and drying device. The hollow shaft 5 rotates, and the material turns over continuously during the forward movement. Every point where the material passes can contact the heat source and always keep in full contact with the heating body, so that the moisture in the material can continuously absorb heat and evaporate, thereby achieving the purpose of drying and dehydration. The process can realize the segmented drying of the material using the same motor. Compared with the traditional method of continuously superimposing multiple spiral heating drying devices with a single spiral shaft to achieve continuous segmented drying, it effectively reduces the overall cost and improves the resource utilization rate; the dried material is collected in a vacuum discharge tank, and the external vacuum pump is started to evacuate the vacuum discharge tank to make it in a vacuum state.

[0038] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A spiral heating and drying process under vacuum, characterized in that: The following steps are involved: S1: Add the material to be dried into the vacuum feed tank for temporary storage, start the external vacuum pump, and evacuate the vacuum feed tank to make it in a vacuum state; S2: Start the external vacuum pump to evacuate the spiral heating and drying device; S3: Start the external steam generating device to transport the hot steam to the heating jacket and the hollow shaft of the spiral heating and drying device; S4: adding the material to be dried temporarily stored in the vacuum feed tank to the spiral heating drying device, starting the spiral heating drying device to continuously transport the material forward, and drying the material being continuously transported forward; S5: Collect the dried materials into a vacuum discharge tank, start an external vacuum pump, and evacuate the vacuum discharge tank to put it in a vacuum state. The spiral heating and drying device comprises an outer shell (4), a hollow shaft (5) is symmetrically rotatably connected inside the outer shell (4), a partition plate (6) arranged between the hollow shafts (5) is arranged on the inner wall of the outer shell (4), a driving component (7) for driving the hollow shaft (5) to rotate is arranged on the outer wall of the outer shell (4), both ends of the hollow shaft (5) pass through the side wall of the outer shell (4) and are provided with a rotating joint (8), a conveying pipe (9) connected to each other is arranged between the rotating joints (8) on one side, a vacuum port (11) arranged on both sides of the partition plate (6) is arranged on the side wall of the outer shell (4), the outer shell (4) comprises a shell body (12), and a heating jacket (13) arranged inside the shell body (12), and a conveying cavity (14) connected to the heating jacket (13) is arranged inside the partition plate (6).

2. The spiral heating and drying process under vacuum according to claim 1, characterized in that: The vacuum feeding tank comprises a tank body (1), a feeding port (2) arranged at the top of the tank body (1), a discharging port (3) arranged at the bottom of the tank body (1), and a vacuum extraction port arranged on the side wall of the tank body (1). The vacuum feeding tank has the same structure as the vacuum discharging tank, and serves to place the material in a vacuum state during feeding and discharging.

3. The spiral heating and drying process under vacuum according to claim 1, characterized in that: The side wall of the shell (12) is provided with a connection port (15) connected to the heating jacket (13), and the side walls of both sides of the conveying cavity (14) are provided with conveying ports (16) connected to the connection port (15).

4. The spiral heating and drying process under vacuum according to claim 1, characterized in that: The outer wall of the delivery pipe (9) is provided with a reinforcing rib (17) fixedly connected to the side wall of the outer shell (4).

5. The spiral heating and drying process under vacuum according to claim 1, characterized in that: The driving assembly (7) comprises a motor (18) mounted on the outer wall of the housing (4); the output end of the motor (18) is fixedly connected to a main pulley (19); the end of the hollow shaft (5) is provided with a secondary pulley (20) disposed outside the housing (4); a matching belt (21) is provided between the main pulley (19) and the secondary pulley (20).

6. The spiral heating and drying process under vacuum according to claim 1, characterized in that: The rotating joint (8) on the other side is provided with interconnected heat inlet and outlet ports (10), one side of the shell (12) is provided with a heat inlet port (22) connected to the heating jacket (13), and the other side of the shell (12) is provided with a heat outlet port (23) connected to the heating jacket (13).

7. The spiral heating and drying process under vacuum according to claim 1, characterized in that: The upper hollow shaft (5) is provided with a spiral blade 1 (24), and the lower hollow shaft (5) is provided with a spiral blade 2 (25) which rotates in the opposite direction to the spiral blade 1 (24).

8. The spiral heating and drying process under vacuum according to claim 1, characterized in that: An inlet (26) is provided on one side of the top of the shell (4), an outlet (27) is provided on the same side of the bottom of the shell (4), and a discharge port (28) is provided on the side of the partition plate (6) away from the inlet (26).

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