CN109163539B

CN109163539B - Pneumatic drying equipment

Info

Publication number: CN109163539B
Application number: CN201810903943.3A
Authority: CN
Inventors: 丁以瑟
Original assignee: Suzhou Xuben Technology Co ltd
Current assignee: Suzhou XuBen Technology Co.,Ltd.
Priority date: 2018-08-09
Filing date: 2018-08-09
Publication date: 2021-10-26
Anticipated expiration: 2038-08-09
Also published as: CN109163539A

Abstract

The invention discloses airflow drying equipment, which comprises a long-strip-shaped drying channel, wherein a conveying line is arranged in the drying channel along an axis, the airflow drying equipment also comprises an air supply assembly for conveying air into the drying channel and an exhaust assembly for exhausting air from the drying channel, the drying channel sequentially comprises an air heating area, a drying area and a cooling area from a feed inlet to a discharge outlet, the air heating area and the drying area as well as the drying area and the cooling area are separated by clapboards, and the conveying line penetrates through the clapboards; a plurality of heating mechanisms are arranged in the heating area, the drying area and the cooling area along the axis; each heating mechanism is configured to: in the material conveying direction from the feeding hole to the discharging hole, the temperature of the heating area is gradually increased, the temperature of the drying area is constant, and the temperature of the cooling area is gradually reduced. The airflow drying equipment provided by the invention realizes slow heating and slow cooling in the heating process and the cooling process before and after drying, thereby reducing or even avoiding negative effects caused by rapid temperature change.

Description

Pneumatic drying equipment

Technical Field

The invention relates to a chemical production technology, in particular to airflow drying equipment.

Background

Drying refers to the process in the chemical industry in which moisture (or solvent) in the material is vaporized by means of thermal energy and the resulting vapor is carried away by the gas. It is commonly used in the industries of medicine, food and the like, and is occasionally used in the industries of textile, electronics and the like, and the common drying process in the prior art is as follows: the object to be dried (generally, a material) is placed in a drying chamber, such as a closed chamber with a temperature higher than 70 ℃, and excess moisture in the object to be dried is evaporated through high temperature, so that the drying is realized. The invention patent with an authorization notice number of CN206113539U and an authorization notice date of 2017, 4 and 9 and named as drying device for spinning comprises a heating plate, a temperature control box and a heating plate bracket; the temperature control box is a cuboid heating box, a bracket groove is formed in the bottom of the temperature control box, and a power circuit is distributed in the groove; the support is placed in the support groove, at least two layers of heating plates are placed on the support, and the humidity sensor and the temperature sensor are fixedly installed on the heating plate support. This drying device is used in weaving realizes heating in order to realize drying effect to inside fabric through the temperature control case of high temperature.

The defects of the prior art are that the temperature inside the temperature control box is high, when an object to be dried is placed in and taken out of the temperature control box, the object to be dried is subjected to a rapid temperature change, for example, the temperature inside the temperature control box is 100 ℃, and the room temperature is 25 ℃, the object to be dried is subjected to a temperature difference of 75 ℃, for the object to be dried which is partially sensitive to the temperature, such as nitroglycerin, nifedipine thin-coated tablets, clonidine, musk heart-protecting pills and other medicines, the shelf life of the object to be dried is shortened or the efficacy of the object to be dried is reduced due to the severe temperature change, and for electronic products, textiles and the like, the efficiency of the object to be dried is influenced due to the large temperature difference change, such as the hardness of the electronic products and the migration probability of the textiles, so that the drying device in the prior art is lack of a technology for slowly changing the drying temperature.

Disclosure of Invention

The invention aims to provide airflow drying equipment to solve the defects in the prior art.

In order to achieve the above purpose, the invention provides the following technical scheme:

an airflow drying device comprises a long strip-shaped drying channel, wherein a conveying line is arranged in the drying channel along an axis, the airflow drying device also comprises an air supply assembly for conveying air into the drying channel and an exhaust assembly for exhausting air from the inside of the drying channel, the drying channel sequentially comprises an air heating area, a drying area and a cooling area from a feed inlet to a discharge outlet, the air heating area and the drying area and the cooling area are separated by partition plates, and the conveying line penetrates through the partition plates; a plurality of heating mechanisms are arranged in the heating area, the drying area and the cooling area along the axis;

each of the heating mechanisms is configured to: in the material conveying direction from the feeding hole to the discharging hole, the temperature of the heating area is gradually increased, the heating speed is in a preset range, the temperature of the drying area is constant, the temperature of the cooling area is gradually reduced, the cooling speed is in a preset range, and the temperature of the drying area is not lower than the highest temperature of the heating area and the cooling area.

In the airflow drying equipment, the feed inlet and the discharge outlet are respectively provided with the first air separation vertical strips.

The end part of the partition plate is provided with the isolation assembly, the isolation assembly comprises an isolation cavity, the two ends of the isolation cavity are provided with second air separation vertical strips, the conveying line penetrates through the isolation cavity, and the two end parts of the second air separation vertical strips are lapped on materials on the conveying line.

In the above pneumatic drying apparatus, the air supply assembly includes three air supply pipes, and the three air supply pipes respectively supply air to the heating area, the drying area, and the cooling area;

the exhaust assembly comprises three exhaust pipes, and the three exhaust pipes respectively exhaust gas from the heating area, the drying area and the cooling area.

In the above pneumatic drying apparatus, the gas supply assembly includes a gas supply pipe, the gas exhaust assembly includes two gas exhaust pipes, the gas supply pipe is configured to supply gas to the middle of the heating area, and the two gas exhaust pipes respectively exhaust gas from the feed port and the discharge port;

the partition board is provided with a communication hole.

In the above pneumatic drying device, the air supply assembly includes an air supply channel, the air supply channel is arranged along an axis in the drying channel, and each heating mechanism is arranged in the air supply channel at intervals; and the air supply channel is provided with a plurality of air supply holes communicated with the heating area, the drying area and the cooling area in parallel.

The airflow drying equipment further comprises a temperature adjusting assembly, wherein the temperature adjusting assembly comprises a plurality of temperature adjusting pipelines, and the temperature adjusting pipelines are connected to the heating area and the cooling area at intervals.

The air flow drying equipment further comprises a dehumidifying mechanism, wherein an air inlet of the dehumidifying mechanism is communicated with the exhaust assembly, and an air outlet of the dehumidifying mechanism is communicated with the air supply assembly.

The airflow drying equipment further comprises a negative pressure extracting mechanism, and the negative pressure extracting mechanism is connected to the air inlet of the dehumidifying mechanism.

In the technical scheme, the airflow drying equipment provided by the invention gradually heats through the heating area during drying, then dries through the drying area, and finally cools through the cooling area, so that the slow heating and slow cooling of the heating process and the cooling process before and after drying are realized, and the negative effect caused by rapid temperature change is reduced and even avoided.

Drawings

In order to more clearly illustrate the embodiments of the present application or technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and other drawings can be obtained by those skilled in the art according to the drawings.

Fig. 1 is a schematic structural diagram of an airflow drying device provided by an embodiment of the invention;

fig. 2 is a schematic structural diagram of an airflow drying device according to an embodiment of the present invention.

Description of reference numerals:

1. a drying channel; 1.1, a feed inlet; 1.2, a discharge hole; 1.3, a heating area; 1.4, a drying area; 1.5, a cooling area; 2. a conveying line; 3. an air supply assembly; 4. an exhaust assembly; 5. a partition plate; 6. material preparation; 7. a heating mechanism; 8. a first air-separation flap; 9. an isolation chamber; 10. a second air-separation flap; 11. an air supply channel; 12. an air supply hole; 13. a dehumidification mechanism; 14. and a negative pressure extraction mechanism.

Detailed Description

In order to make the technical solutions of the present invention better understood, those skilled in the art will now describe the present invention in further detail with reference to the accompanying drawings.

As shown in fig. 1-2, an airflow drying apparatus provided in an embodiment of the present invention includes a long drying channel 1, a conveying line 2 is disposed along an axis in the drying channel 1, and further includes a gas supply module 3 that conveys gas into the drying channel 1 and a gas exhaust module 4 that exhausts gas from the drying channel 1, an increasing temperature region 1.3, a drying region 1.4 and a decreasing temperature region 1.5 are sequentially included in the drying channel 1 from a feed port 1.1 to a discharge port 1.2, the increasing temperature region 1.3 and the drying region 1.4 and the decreasing temperature region 1.5 are separated by a partition plate 5, and the conveying line 2 penetrates through the partition plate 5; a plurality of heating mechanisms 7 are arranged in the heating area 1.3, the drying area 1.4 and the cooling area 1.5 along the axis; each of the heating mechanisms 7 is configured to: in the direction of conveying the material 6 from the feed inlet 1.1 to the discharge outlet 1.2, the temperature of the temperature rising area 1.3 gradually rises and the temperature rising speed is within a preset range, the temperature of the drying area 1.4 is constant, the temperature of the temperature falling area 1.5 gradually decreases and the temperature falling speed is within a preset range, and the temperature of the drying area 1.4 is not lower than the highest temperature of the temperature rising area 1.3 and the temperature falling area 1.5.

Specifically, the pneumatic drying device provided by this embodiment dries the material 6 through the high-temperature airflow, and is mainly used for drying various materials 6 with negative effects caused by severe temperature changes, such as some chemical intermediates, medicines, and the like, and also can be applied to drying electronic products and textiles. The drying channel 1 is a conveying space for the materials 6 and a drying space for the materials 6, a conveying line 2 is arranged in the drying channel 1 along an axis, and the conveying line 2 is a conveying device, such as a conveying belt, for the materials 6, and other conveying mechanisms for the materials 6 in the industrial production process can also be used. During the material 6 is conveyed in the drying channel 1, the air in the drying channel 1 is heated by the heating mechanism 7 to form high temperature so as to dry the material 6, the air supply component 3 such as an air supply pipeline supplies relatively dry air into the drying channel 1, and the air exhaust component 4 such as an air exhaust pipeline exhausts relatively humid air after the material 6 is dried, so that the material 6 is dried.

The airflow drying device provided by the embodiment, the internal space of the drying channel 1 is divided into a heating area 1.3, a drying area 1.4 and a cooling area 1.5 by at least two partition plates 5, the partition plates 5 relatively isolate three areas to form a pattern that mutual temperature is not significantly affected, the three areas are all provided with a plurality of heating mechanisms 7, the plurality of heating mechanisms 7 are arranged from one end to the other end of the drying channel 1, for example, one heating mechanism 7 is arranged every 1 meter, 0.5 meter and 0.2 meter, the heating mechanisms 7 are various devices capable of heating air, for example, resistance wires of a direct heating mechanism 7, or indirect heating mechanisms 7 such as a steam heating mechanism 7 and the like. The core innovation point of the embodiment is that when heating and drying, the working temperature of each heating mechanism 7 is controlled to be inconsistent, the temperature of the heating area 1.3 is gradually increased and the heating speed is within a preset range, the temperature of the drying area 1.4 is constant, the temperature of the cooling area 1.5 is gradually decreased and the cooling speed is within a preset range, and the temperature of the drying area 1.4 is not lower than the highest temperature of the heating area 1.3 and the cooling area 1.5. For example, the working temperature of each heating mechanism 7 in the drying area 1.4 is 100 degrees, the working temperature of the heating area 1.3 and the heating mechanism 7 closest to the drying area 1.4 in the cooling area 1.5 is 100 degrees, the next closest is 95 degrees, the next closest is 90 degrees, and the like until the material inlet 1.1 and the material outlet 1.2 are obtained. The specific temperature setting, temperature difference setting and distance setting are based on the drying temperature required by the material 6, so that the situation that the temperature of the drying area 1.4 is highest and constant and the temperatures of the heating area 1.3 and the cooling area 1.5 are gradually changed can be realized, the material 6 dried through the drying channel 1 cannot be subjected to severe temperature change, and the stability of the physicochemical property of the material is maintained.

In this embodiment, the gas supply assembly 3 and the gas exhaust assembly 4 may be disposed only in the drying region 1.4, the input gas is heated to the same temperature as the temperature of the temperature-raising region 1.3, and the temperature-raising region 1.3 and the temperature-lowering region 1.5 are maintained constant in the temperature difference environment only by the working temperature difference of the heating mechanism 7 and the natural heat dissipation, but alternatively, the gas supply assembly 3 and the gas exhaust assembly 4 may be disposed in the temperature-raising region 1.3 and the temperature-lowering region 1.5, as described in detail later.

The pneumatic drying device provided by the present embodiment, due to the need to provide a drying environment with gradually changing temperature, requires a drying channel 1 with a longer length, such as 20 meters, 30 meters, 50 meters or even longer, and its axial dimension far exceeds that of the existing drying device, and it is preferable that it is arranged in a serpentine pipe or a disk-shaped surrounding arrangement based on the space arrangement.

According to the airflow drying equipment provided by the embodiment of the invention, during drying, the temperature is gradually increased through the temperature increasing region 1.3, then the drying is performed through the drying region 1.4, and finally the temperature is reduced through the temperature reducing region 1.5, so that the slow temperature increase and the slow temperature reduction in the temperature increasing process and the temperature reducing process before and after drying are realized, and the negative effect caused by rapid temperature change is reduced and even avoided.

In another embodiment provided by the present invention, further, the feed port 1.1 and the discharge port 1.2 are both provided with a first air isolating vertical strip 8, and the first air isolating vertical strip 8 is an isolating structure capable of freely falling, such as a plastic strip, a rubber strip or a cloth strip, and is used for reducing air flow between the drying channel 1 and an external environment, so that a relatively stable drying environment is maintained in the drying channel 1 as much as possible, and a temperature variation range is reduced.

In still another embodiment of the present invention, further, an isolation component is disposed at an end of the partition board 5, the isolation component is a portion of the partition board 5 directly contacting the material 6, and is also a transition portion of the material 6 shuttling between the drying area 1.4 and the temperature rising area 1.3 and the temperature lowering area 1.5, the isolation component includes an isolation cavity 9, one end of the isolation cavity 9 is the drying area 1.4, the other end is the temperature rising area 1.3 or the temperature lowering area 1.5, both ends of the isolation cavity 9 are provided with second air-isolating vertical bars 10, the second air-isolating vertical bars 10 may have the same structure as the first air-isolating vertical bars 8 and are used for isolating the isolation cavity 9 and the three areas, the conveying line 2 passes through the isolation cavity 9, and end portions of the two second air-isolating vertical bars 10 are lapped on the material 6 on the conveying line 2, such that almost no air flows between the drying area 1.4 and the temperature rising area 1.3 and the temperature lowering area 1.5, at this time, the drying zone 1.4 is mainly dried separately, and if linkage drying (mentioned later) is needed to be realized among the three zones, an isolation component is not needed, and holes can even be formed on the partition plate 5.

In yet another embodiment of the present invention, the gas supply assembly 3 includes three gas supply pipes, the three gas supply pipes respectively supply gas to the temperature rising region 1.3, the drying region 1.4 and the temperature lowering region 1.5, the exhaust assembly 4 includes three gas exhaust pipes, the three gas exhaust pipes respectively exhaust gas from the temperature rising region 1.3, the drying region 1.4 and the temperature lowering region 1.5, that is, three regions respectively and independently perform gas exchange, and there is almost no gas flow between the three regions, and the gas exchange aims to remove moisture generated by drying the material 6, so as to keep the gas in the drying channel 1 relatively dry, and improve the drying efficiency. And a dehumidifying mechanism 13 is further included, preferably, an air inlet of the dehumidifying mechanism 13 is communicated with the exhaust component 4, such as an exhaust pipe, and an air outlet of the dehumidifying mechanism 13 is communicated with the air supply component 3, such as an air supply pipe, so that the circulation of the gas is realized, and the loss of heat energy is reduced.

In another embodiment of the present invention, as another mode, the gas supply assembly 3 includes a gas supply pipe, the gas exhaust assembly 4 includes two gas exhaust pipes, the gas supply pipe is used for supplying gas to the middle of the heating area 1.3, and the two gas exhaust pipes respectively exhaust gas from the feed port 1.1 and the discharge port 1.2; the partition board 5 is provided with a communicating hole, at the moment, high-temperature drying gas is input into the drying area 1.4 in the middle of the drying channel 1, and the gas moves from the middle to the two ends and is finally discharged from the feed port 1.1 and the discharge port 1.2. Alternatively, drying gas can also be supplied via the inlet opening 1.1 and the outlet opening 1.2 and finally withdrawn from the drying zone 1.4. Such a single gas circulation mechanism can save two dehumidification mechanisms 13. At this time, the partition plate 5 is provided with a communication hole to communicate the drying region 1.4 with the heating region 1.3 and the cooling region 1.5, thereby realizing smooth circulation of gas.

Still include negative pressure pumping mechanism 14, negative pressure pumping mechanism 14 connect in dehumidification mechanism 13's air inlet department, negative pressure pumping mechanism 14 is like fan, air pump etc. with higher speed gaseous circulation, promotes drying efficiency.

Further, the negative pressure extraction mechanism 14 and the air delivery assembly 3 are configured to: the air supply quantity of the air supply component 3 is larger than the extraction quantity of the negative pressure extraction mechanism 14, and meanwhile, due to the existence of the first isolation vertical strip, a high-pressure environment which is larger than the environmental pressure is formed in the drying channel 1, and the high-pressure drying air is beneficial to improving the drying efficiency.

As shown in fig. 2, further, the air supply assembly 3 includes an air supply channel 11, the air supply channel 11 is arranged along the axis of the drying channel 1, that is, the air supply assembly 3 includes a portion located inside the drying channel 1, the portion is the air supply channel 11, and each heating mechanism 7 is arranged in the air supply channel 11 at intervals; the air feed channel 11 is provided with a plurality of air feed holes 12 which are communicated with the heating area 1.3, the drying area 1.4 and the cooling area 1.5 in parallel. The air supply channel 11 may be a pipeline arranged in the drying channel 1, or may be a channel structure integrated on a channel wall of the drying channel 1, each of the heating mechanisms 7 is uniformly arranged in the air supply channel 11, an area of the air supply channel 11 opposite to each of the heating mechanisms 7 is provided with an air supply hole 12, that is, from one end to the other end of the drying channel 1, an air supply hole 12 is arranged on an air supply channel, both ends of the air supply channel are supplied with air, heated air is output into the drying channel 1 through the air supply hole 12, the air supply channel is used for inputting air from the inside of the drying channel 1 to a space where the conveying line 2 is located, but the heating mechanism 7 is arranged inside the air supply channel, and a gas atmosphere with sequentially changed temperature is also formed in the air supply channel and is output into the drying channel 1 through the air supply holes 12, and the function of the arrangement is that, in the smaller space of the gas transmission channel, the step temperature difference is easier to form.

Preferably, the gas transmission channel may be a plurality of, such as two, three, four, which are disposed at different positions, such as upper and lower portions, in the drying channel 1.

In yet another embodiment of the present invention, the temperature adjusting device further includes a temperature adjusting assembly, the temperature adjusting assembly includes a plurality of temperature adjusting pipelines, each of the temperature adjusting pipelines is connected to the temperature rising region 1.3 and the temperature lowering region 1.5 at intervals, the temperature adjusting pipelines are used for inputting normal temperature or low temperature air into the drying channel 1 or the air transmission pipeline for temperature adjustment, for example, the high temperature air is input through the middle part, the low temperature air is extracted from the two ends, the temperature of the air needs to be gradually reduced in the transmission process at this time, the temperature may not be reduced due to natural heat dissipation and drying energy consumption of the heating mechanism 7, and the temperature adjustment is realized by introducing the low temperature air at this time. Synchronously, a plurality of temperature sensors can be arranged in the drying channel 1 at intervals, and the air inflow of each temperature adjusting pipeline is controlled through the temperature sensors, so that the temperature is accurately adjusted.

Furthermore, the entrance of drying passageway 1 is provided with discernment sensing device, and discernment sensing device is used for the material 6 type of carrying on transfer chain 2, and most commonly, discernment sensing device is the camera, and it shoots the photo of material 6 of input to carry out analysis and contrast various material 6 photos of prestoring to the photo, realize the discernment to material 6 type, or other can discern the sensing device of material 6 classification again. The effect that so sets up lies in, and the material 6 of different grade type is different to temperature variation's sensitivity, and the temperature that can bear decreases the range of difference gradually promptly, and the temperature that needs drying is also different, so according to discernment sensing device's testing result control each heating mechanism 7 and the subassembly that adjusts the temperature, according to the difference of the material 6 that detects, realizes more intelligent to the automatic control and the regulation of temperature.

In another embodiment provided by the present invention, it is preferable that each of the heating mechanism 7 and the conveyor line 2 is configured to, in operation: for any conveyed material 6, the change amplitude of the ambient temperature per second does not exceed 0.5 degree, and as the conveyed material 6 is conveyed by the conveying line 2, if the conveying speed of the conveying line 2 is 0.25 meter per second, the temperature difference of every 0.25 meter distance does not exceed 0.5 degree in the drying channel 1, namely the temperature difference of every meter distance does not exceed degree, and the like, the change amplitude is actually the gas change amplitude of the drying channel 1. A variation of 2 degrees per meter almost guarantees that most compounds are acceptable without negative effects of physicochemical properties.

In still another embodiment of the present invention, further, a plurality of heat preservation ribbons are spaced in the drying channel 1, each heat preservation ribbon falls from the top to the bottom of the drying channel 1, each heat preservation ribbon is provided with an opening for the conveying line 2 to pass through, preferably, a heat preservation ribbon is arranged between any two adjacent heating mechanisms 7, the heat preservation ribbon is used for reducing the air flow at two sides of the heat preservation ribbon, the drying channel 1 is cut into sections, and the air flow is reduced due to the heat preservation ribbons between each section, so that the temperature difference is easier to maintain. The heat preservation streamer is a soft ribbon which vertically hangs down, such as a plastic ribbon, a rubber ribbon and the like.

While certain exemplary embodiments of the present invention have been described above by way of illustration only, it will be apparent to those of ordinary skill in the art that the described embodiments may be modified in various different ways without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and should not be construed as limiting the scope of the invention.

Claims

1. The airflow drying equipment comprises a long-strip drying channel, wherein a conveying line is arranged in the drying channel along an axis, and the airflow drying equipment also comprises an air supply assembly for conveying air into the drying channel and an exhaust assembly for exhausting air from the inside of the drying channel; a plurality of heating mechanisms are arranged in the heating area, the drying area and the cooling area along the axis;

each of the heating mechanisms is configured to: in the material conveying direction from the feeding hole to the discharging hole, the temperature of the heating area is gradually increased, the heating speed is in a preset range, the temperature of the drying area is constant, the temperature of the cooling area is gradually reduced, the cooling speed is in a preset range, and the temperature of the drying area is not lower than the highest temperature of the heating area and the cooling area;

the end part of the partition board is provided with an isolation assembly, the isolation assembly comprises an isolation cavity, two ends of the isolation cavity are respectively provided with a second air separation vertical strip, the conveying line penetrates through the isolation cavity, and the end parts of the two second air separation vertical strips are lapped on the material on the conveying line;

the air feeding assembly comprises an air feeding channel, the air feeding channel is arranged along an axis in the drying channel, and the heating mechanisms are arranged in the air feeding channel at intervals; a plurality of air supply holes communicated with the heating area, the drying area and the cooling area are arranged on the air supply channel in parallel;

a plurality of heat-insulation ribbons are arranged in the drying channel at intervals, each heat-insulation ribbon falls from the top to the bottom of the drying channel, an opening for the conveying line to pass through is formed in each heat-insulation ribbon, and a heat-insulation ribbon is arranged between any two adjacent heating mechanisms;

still include negative pressure extraction mechanism, negative pressure extraction mechanism connects in dehumidification mechanism's air inlet department, and negative pressure extraction mechanism and air feed subassembly are configured as: the air supply quantity of the air supply component is larger than the extraction quantity of the negative pressure extraction mechanism.

2. A pneumatic drying apparatus according to claim 1, wherein the feed inlet and the discharge outlet are each provided with a first air-isolating flap.