Hot air circulation device for drying abrasive cloth

Abstract

The utility model relates to a hot air circulation device for drying abrasive cloth, which comprises a drying room, the drying room is communicated with an air supply header pipe and an air exhaust header pipe, the air exhaust header pipe is provided with a first humidity sensor, a first fan, a first flow sensor, a circulation pipe and a first regulating valve, and the circulation pipe is provided with a second regulating valve, a second flow sensor and an air mixer. The air mixer comprises a mixing tank, an air conveying bent pipe, an air guide cone and mixing blades, the outlet end of the mixing tank is communicated with an air supply header pipe, the air supply header pipe is provided with a second humidity sensor, a first electric heater and a first temperature sensor, and the air conveying bent pipe is communicated with an air conveying pipe; and a third adjusting valve, a second fan and a first air filter are arranged on the air conveying pipe. A part of tail gas released outwards from the abrasive cloth drying device can be used as a part of drying airflow towards the abrasive cloth drying device; the utility model has the advantages of convenient use and wide market prospect.

Description

Technical Field

[0001] The utility model relates to the field of hot air supply equipment for drying emery cloth, in particular to a hot air circulation device for drying emery cloth. Background Art

[0002] Emery cloth is a coated abrasive that uses a binder to adhere abrasive grains to a flexible substrate. It can achieve grinding of special-shaped and curved surfaces. It is efficient, economical and widely used. Drying and curing are key processes in the manufacture of coated abrasive cloth. The drying and curing process is the process of forming a binder film when the abrasive grains adhere to the flexible substrate, that is, the process of fixing the abrasive grains on the substrate. Drying and curing are two different but interrelated concepts. Drying refers to a physical process of removing water or other solvents from a material, while curing refers to the process of polymerizing and curing the material through heating or baking, which causes a series of chemical changes to occur and form a hard film. But they both need to be heated; the two processes are carried out alternately; after the process is completed, the material must have a certain hardness, strength, heat resistance, etc.

[0003] After the glue coating and sand planting in the production process of emery cloth are completed, it needs to be dried to fix the sand layer and realize the function of emery cloth. During the drying process, the adhesive solidifies and also fixes the sand layer on the adhesive. During the curing process of the adhesive, moisture and other solvents will be released to the outside, most of which are moisture. In the curing process of the adhesive of the emery cloth, in addition to the need to continuously heat the emery cloth drying device, it is also necessary to use the flowing airflow to continuously transport it into the emery cloth drying device, and use the airflow to continuously take away the moisture and other solvents continuously released by the emery cloth, so that the moisture and other solvents in the gas in the emery cloth drying device are always maintained in an appropriate range, so as to achieve that the moisture and other solvents of the adhesive can be continuously and stably released to the outside during the complete drying process of the emery cloth. The airflow discharged from the drying device will carry away part of the heat. Therefore, from the perspective of energy saving, this part of the airflow discharged to the outside should also be considered to be fully or partially recycled, so as to use part of the hot airflow discharged to the outside to mix the air to reduce the heating amplitude required for the hot airflow transported to the emery cloth drying device, so as to achieve the consumption of heat energy and energy saving. Summary of the invention

[0004] In view of the deficiencies in the prior art, the utility model provides a hot air circulation device for drying emery cloth, which can utilize part of the exhaust gas released outward from the emery cloth drying device as part of the drying air flow to the emery cloth drying device, so as to overcome the defects in the prior art.

[0005] The technical scheme adopted by the utility model is as follows: a hot air circulation device for drying abrasive cloth comprises a drying room, wherein the drying room is connected with an air supply main pipe and an exhaust main pipe, the exhaust main pipe is provided with a first humidity sensor, a first fan, a first flow sensor, an inlet end of a circulation pipe and a first regulating valve in sequence along a direction close to the drying room to a direction away from the drying room, the circulation pipe is provided with a second regulating valve and a second flow sensor, an air mixer is provided on the outlet end of the circulation pipe, the air mixer comprises a mixing tank and an air delivery elbow, an air guide cone and a mixing blade in the mixing tank which are arranged in sequence along a direction close to the circulation pipe to a direction away from the circulation pipe, the inlet end of the mixing tank is connected with the outlet end of the circulation pipe, the outlet end of the mixing tank is connected with the air supply main pipe, the air supply main pipe is provided with a second humidity sensor, a first electric heater and a first temperature sensor in sequence along a direction close to the mixing tank to a direction away from the mixing tank, the air delivery elbow is connected with an air delivery pipe, and the air delivery pipe is provided with a third regulating valve, a second fan and a first air filter in sequence along a direction close to the air delivery elbow to a direction away from the air delivery elbow.

[0006] Preferably, the gas delivery elbow adopts an L-shaped tubular structure, the central axis of the mixing tank, the central axis of the gas delivery elbow outlet end and the central axis of the gas guide cone are located on the same axis, the number of mixing blades is several, and the several mixing blades are distributed in a star shape on the outside of the central axis of the mixing tank.

[0007] Preferably, a second temperature sensor is provided on the air supply main pipe between the second humidity sensor and the first electric heater, and a third temperature sensor is provided on the air exhaust main pipe between the first humidity sensor and the first fan.

[0008] Preferably, the outlet end of the exhaust main pipe is connected to the inlet end of the heat source channel of the heat exchanger, the outlet end of the heat source channel of the heat exchanger is connected to the inlet end of the adsorption tank, the adsorption tank includes an adsorption tank body and a zeolite molecular sieve layer, the outlet end of the adsorption tank is connected to the exhaust gas delivery pipe, the number of adsorption tanks is at least two, each adsorption tank is connected to the heat exchanger through a first delivery pipe, each adsorption tank is connected to the exhaust gas delivery pipe through a second delivery pipe, and the first delivery pipe and the second delivery pipe are respectively provided with a first stop valve.

[0009] Preferably, it also includes a desorption gas delivery pipe and a desorption gas output pipe, the outlet end of each adsorption tank and the desorption gas delivery pipe are connected through a third delivery pipe, the inlet end of each adsorption tank and the desorption gas output pipe are connected through a fourth delivery pipe, and the third delivery pipe and the fourth delivery pipe are respectively provided with a second stop valve.

[0010] Preferably, the desorbed gas delivery pipe is provided with a fourth temperature sensor, a second electric heater, a third fan and a second air filter in sequence along a direction from close to the third delivery pipe to far away from the third delivery pipe.

[0011] Preferably, an online chromatograph is provided on the desorption gas output pipe.

[0012] The beneficial effects of the utility model are as follows: first, the utility model utilizes part of the exhaust gas released outward from the emery cloth drying device as part of the drying airflow to the emery cloth drying device, and can reasonably adjust the exhaust gas delivered to the air mixer through the circulation pipe through the parameters fed back by the first humidity sensor and the second humidity sensor, and judge the flow rate of the exhaust gas delivered to the air mixer through the circulation pipe for circulation through the parameters fed back by the second flow sensor.

[0013] Secondly, the utility model provides a first humidity sensor, a first fan, a first flow sensor, an inlet end of a circulation pipe and a first regulating valve on the exhaust main pipe in sequence from close to the drying room to far away from the drying room; installing the first humidity sensor facilitates feedback of humidity parameters, and installing the first flow sensor facilitates feedback of flow parameters.

[0014] Finally, the utility model provides the air supply main pipe with a second humidity sensor, a first electric heater and a first temperature sensor in sequence along the direction from close to the mixing tank to far away from the mixing tank; installing the second humidity sensor can feedback the humidity parameters, and installing the first electric heater can facilitate heating of the gas.

[0015] The utility model has the advantages of simple structure, convenient operation, ingenious design, greatly improved working efficiency, good social and economic benefits, and is a product that is easy to promote and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] Figure 2 for Figure 1 A partial enlarged schematic diagram of detail A. DETAILED DESCRIPTION

[0018] like Figure 1 and Figure 2As shown, a hot air circulation device for drying abrasive cloth comprises a drying room 1, the drying room 1 is connected with an air supply main pipe 2 and an exhaust main pipe 3, the exhaust main pipe 3 is provided with a first humidity sensor 4, a first fan 5, a first flow sensor 6, an inlet end of a circulation pipe 7 and a first regulating valve 8 in sequence along the direction from close to the drying room 1 to far away from the drying room 1, the circulation pipe 7 is provided with a second regulating valve 9 and a second flow sensor 10, and an air mixer is provided at the outlet end of the circulation pipe 7, the air mixer comprises a mixing tank 11 and a mixing tank 11 is provided with a mixing tank 11 in sequence along the direction from close to the circulation pipe 7 to far away from the circulation pipe 7. The gas delivery elbow 12, the air guide cone 13 and the mixing blade 14 are arranged, the inlet end of the mixing tank 11 is connected with the outlet end of the circulation pipe 7, the outlet end of the mixing tank 11 is connected with the air supply main pipe 2, the air supply main pipe 2 is provided with a second humidity sensor 15, a first electric heater 16 and a first temperature sensor 17 in sequence along the direction from close to the mixing tank 11 to far away from the mixing tank 11, the gas delivery elbow 12 is connected with an air delivery pipe 18, and the air delivery pipe 18 is provided with a third regulating valve 19, a second fan 20 and a first air filter 21 in sequence along the direction from close to the gas delivery elbow 12 to far away from the gas delivery elbow 12.

[0019] The gas delivery elbow 12 adopts an L-shaped tubular structure, the central axis of the mixing tank 11, the central axis of the outlet end of the gas delivery elbow 12 and the central axis of the air guide cone 13 are located on the same axis, and the number of mixing blades 14 is a plurality, and the plurality of mixing blades 14 are distributed in a star shape outside the central axis of the mixing tank 11. This facilitates improving the mixing degree between the exhaust gas delivered from the air inlet end of the mixing tank 11 and the air delivered through the gas delivery elbow 12.

[0020] A second temperature sensor 22 is provided on the air supply main 2 between the second humidity sensor 15 and the first electric heater 16, so as to facilitate the feedback of the temperature parameters of the exhaust gas transported out from the drying room 1; a third temperature sensor 23 is provided on the exhaust main 3 between the first humidity sensor 4 and the first fan 5; so as to facilitate the feedback of the temperature parameters of the hot air flow transported to the drying room 1.

[0021] The outlet end of the exhaust main pipe 3 is connected to the inlet end of the heat source channel of the heat exchanger 24, and the outlet end of the heat source channel of the heat exchanger 24 is connected to the inlet end of the adsorption tank 25. The adsorption tank 25 includes an adsorption tank body and a zeolite molecular sieve layer. The outlet end of the adsorption tank 25 is connected to the exhaust gas delivery pipe 26. The number of adsorption tanks 25 is at least two, and several adsorption tanks 25 are connected in parallel with each other, thereby improving the continuity of the adsorption of the exhaust gas transported outward from the heat source channel of the heat exchanger 24; each adsorption tank 25 and the heat exchanger 24 are connected through a first delivery pipe 27, respectively, and each adsorption tank 25 and the exhaust gas delivery pipe 26 are connected through a second delivery pipe 28, respectively, and the first delivery pipe 27 and the second delivery pipe 28 are respectively provided with a first stop valve 29.

[0022] In addition, the product also includes a desorption gas delivery pipe 30 and a desorption gas output pipe 31. The outlet end of each adsorption tank 25 and the desorption gas delivery pipe 30 are respectively connected through a third delivery pipe 32, and the inlet end of each adsorption tank 25 and the desorption gas output pipe 31 are respectively connected through a fourth delivery pipe 33. The third delivery pipe 32 and the fourth delivery pipe 33 are respectively provided with a second stop valve 34. Thus, it is convenient to use the heated airflow delivered from the desorption gas delivery pipe 30 to desorb the adsorption tank 25 to be desorbed so that its adsorption capacity is restored, and the desorbed airflow is delivered to the catalytic combustion device through the desorption gas output pipe 31 to completely decompose it.

[0023] Furthermore, the desorbed gas delivery pipe 30 is provided with a fourth temperature sensor 35, a second electric heater 36, a third fan 37 and a second air filter 38 in sequence along the direction from close to the third delivery pipe 32 to far away from the third delivery pipe 32; the second electric heater 36 is installed to facilitate heating the airflow, and the fourth temperature sensor 35 is installed to facilitate feedback of the temperature parameters of the airflow heated by the second electric heater 36. The desorbed gas output pipe 31 is provided with an online chromatograph 39; the online chromatograph 39 is installed to facilitate feedback of the component parameters in the airflow delivered by the desorbed gas output pipe 31.

[0024] The usage of this product is as follows: Figure 1 and Figure 2 As shown, the following steps are included:

[0025] First, the outside air is filtered by the first air filter 21 and then enters the air delivery pipe 18, and then is delivered to the air supply main pipe 2 through the air delivery elbow 12 and the inner cavity of the mixing tank 11; then, the air entering the air supply main pipe 2 is heated by the first electric heater 16 to form a hot air flow, and the hot air flow is delivered to the drying room 1. After the hot air flow contacts the sandpaper to be dried in the drying room 1, it is discharged from the drying room 1 to form tail gas and enter the exhaust main pipe 3. After being driven by the first fan 5 on the exhaust main pipe 3, it is divided into two parts, namely the first part of the tail gas and the second part of the tail gas. The first part of the exhaust gas is delivered to the heat source channel of the heat exchanger 24 and the medium continuously delivered to the cold source channel of the heat exchanger 24 for countercurrent heat exchange and then delivered to the adsorption tank 25 in working state. The moisture and other organic components in the first part of the exhaust gas are adsorbed by the zeolite molecular sieve layer of the adsorption tank 25 and then delivered to the exhaust gas delivery pipe 26 for the next exhaust gas treatment process; the second part of the exhaust gas is delivered to the inner cavity of the mixing tank 11 through the circulation pipe 7 and merged with the air in the inner cavity of the mixing tank 11 through the gas delivery elbow 12 to form a circulation.

[0026] When the adsorption tank 25 in the working state reaches the preset use period, the state of the adsorption tank 25 needs to be switched, which includes the following steps:

[0027] Close the first stop valve 29 on the first delivery pipe 27 corresponding to the adsorption tank 25 originally in the working state and the first stop valve 29 on the second delivery pipe 28 corresponding to the adsorption tank 25 originally in the working state, and open the first stop valve 29 on the first delivery pipe 27 corresponding to the adsorption tank 25 originally in the standby state and the first stop valve 29 on the second delivery pipe 28 corresponding to the adsorption tank 25 originally in the working state; after completing the above operations, the adsorption tank 25 originally in the working state is converted into the adsorption tank 25 in the waiting desorption state, and the adsorption tank 25 originally in the standby state is converted into the adsorption tank 25 in the working state.

[0028] The adsorption tank 25 in the state to be desorbed needs to be desorbed to restore the adsorption capacity, so that the adsorption tank 25 in the state to be desorbed is converted into the adsorption tank 25 in the standby state again. The specific steps are as follows:

[0029] The third fan 37 is turned on, and the outside air is filtered by the second air filter 38 and then enters the desorption gas delivery pipe 30, and then is heated by the second electric heater 36 to form heated air as the desorption airflow to be delivered to the adsorption tank 25 in the state to be desorbed; then, the desorption airflow is delivered to the desorption gas output pipe 31 and discharged to the combustion device for combustion treatment, during which the component parameters are fed back by the online chromatograph 39. Finally, after the component parameters fed back by the online chromatograph 39 reach the preset range, the third fan 37, the second electric heater 36, the corresponding second stop valve 34 on the third delivery pipe 32, and the second stop valve 34 on the fourth delivery pipe 33 are turned off. At this time, the adsorption tank 25 in the state to be desorbed is converted into the adsorption tank 25 in the standby state again.

[0030] Through this embodiment, it is achieved to utilize part of the exhaust gas released from the emery cloth drying device as a part of the drying air flow to the emery cloth drying device, and the exhaust gas delivered to the air mixer through the circulation pipe 7 can be reasonably adjusted through the parameters fed back by the first humidity sensor 4 and the second humidity sensor 15, and the flow rate of the exhaust gas delivered to the air mixer through the circulation pipe 7 for circulation can be determined through the parameters fed back by the second flow sensor 10.

[0031] The embodiments described above are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes or modifications made based on the structures, features and principles described in the patent scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A hot air circulation device for drying abrasive cloth, characterized in that: The invention comprises a drying room (1), wherein the drying room (1) is connected to an air supply main pipe (2) and an exhaust main pipe (3), wherein the exhaust main pipe (3) is provided with a first humidity sensor (4), a first fan (5), a first flow sensor (6), an inlet end of a circulation pipe (7) and a first regulating valve (8) in sequence from the direction close to the drying room (1) to the direction away from the drying room (1), wherein the circulation pipe (7) is provided with a second regulating valve (9) and a second flow sensor (10), and an air mixer is provided at the outlet end of the circulation pipe (7), wherein the air mixer comprises a mixing tank (11) and an air delivery elbow (12) in sequence provided in the mixing tank (11) along the direction close to the circulation pipe (7) to the direction away from the circulation pipe (7). ), an air guide cone (13) and a mixing blade (14); the inlet end of the mixing tank (11) is connected to the outlet end of the circulation pipe (7); the outlet end of the mixing tank (11) is connected to the air supply main pipe (2); the air supply main pipe (2) is provided with a second humidity sensor (15), a first electric heater (16) and a first temperature sensor (17) in sequence along a direction from close to the mixing tank (11) to far away from the mixing tank (11); the air delivery pipe (18) is connected to the air delivery elbow (12); the air delivery pipe (18) is provided with a third regulating valve (19), a second fan (20) and a first air filter (21) in sequence along a direction from close to the gas delivery elbow (12) to far away from the gas delivery elbow (12).

2. The hot air circulation device for drying abrasive cloth according to claim 1, characterized in that: The gas delivery elbow (12) adopts an L-shaped tubular structure, the central axis of the mixing tank (11), the central axis of the outlet end of the gas delivery elbow (12) and the central axis of the gas guide cone (13) are located on the same axis, and the number of mixing blades (14) is a plurality, and the plurality of mixing blades (14) are distributed in a star shape outside the central axis of the mixing tank (11).

3. The hot air circulation device for drying abrasive cloth according to claim 1, characterized in that: A second temperature sensor (22) is provided on the air supply main pipe (2) between the second humidity sensor (15) and the first electric heater (16), and a third temperature sensor (23) is provided on the air exhaust main pipe (3) between the first humidity sensor (4) and the first fan (5).

4. The hot air circulation device for drying abrasive cloth according to claim 1, characterized in that: The outlet end of the exhaust main pipe (3) is connected to the inlet end of the heat source channel of the heat exchanger (24), and the outlet end of the heat source channel of the heat exchanger (24) is connected to the inlet end of the adsorption tank (25). The adsorption tank (25) comprises an adsorption tank body and a zeolite molecular sieve layer. The outlet end of the adsorption tank (25) is connected to the tail gas delivery pipe (26). The number of adsorption tanks (25) is at least two. Each adsorption tank (25) is connected to the heat exchanger (24) via a first delivery pipe (27), and each adsorption tank (25) is connected to the tail gas delivery pipe (26) via a second delivery pipe (28). The first delivery pipe (27) and the second delivery pipe (28) are each provided with a first stop valve (29).

5. The hot air circulation device for drying abrasive cloth according to claim 4, characterized in that: It also comprises a desorption gas delivery pipe (30) and a desorption gas output pipe (31); the outlet end of each adsorption tank (25) and the desorption gas delivery pipe (30) are respectively connected via a third delivery pipe (32); the inlet end of each adsorption tank (25) and the desorption gas output pipe (31) are respectively connected via a fourth delivery pipe (33); and the third delivery pipe (32) and the fourth delivery pipe (33) are respectively provided with a second stop valve (34).

6. The hot air circulation device for drying abrasive cloth according to claim 5, characterized in that: The desorbed gas delivery pipe (30) is provided with a fourth temperature sensor (35), a second electric heater (36), a third fan (37) and a second air filter (38) in sequence along a direction from close to the third delivery pipe (32) to far away from the third delivery pipe (32).

7. The hot air circulation device for drying abrasive cloth according to claim 5, characterized in that: The desorbed gas output pipe (31) is provided with an online chromatograph (39).

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