WO2021243571A1

WO2021243571A1 - Drying heat recovery apparatus for leather production

Info

Publication number: WO2021243571A1
Application number: PCT/CN2020/093976
Authority: WO
Inventors: 李桂军
Original assignee: 李桂军
Priority date: 2020-06-02
Filing date: 2020-06-02
Publication date: 2021-12-09

Abstract

Disclosed is a drying heat recovery apparatus for leather production, the apparatus comprising a conveying mechanism (2) arranged inside an oven (1), wherein the conveying mechanism (2) is composed of two groups of symmetrically distributed needle-type conveyor belts (3), and a supporting plate (4) is arranged between each group of needle-type conveyor belts (3) with a starting end arranged at an outer side of the oven (1), and at least one pressing apparatus (5) is fixedly connected to the supporting plate (4); and at least three drying inner cavities are provided in the oven (1), with an air exhaust pipe being arranged at the top end of the oven (1) corresponding to each drying inner cavity. The apparatus surpasses an existing two-cavity structural design, and uses multiple cavities to achieve a temperature gradient. In addition, as the number of drying inner cavities increases, harmful waste gas and water vapor discharged from corresponding air exhaust pipes are treated in the first few drying inner cavities, and hot gas discharged from an air exhaust pipe of a tail-end drying inner cavity N can be directly delivered, by means of a pipeline, to an air output pipe in a starting-end drying inner cavity A so as to be used for preliminary drying.

Description

Drying heat recovery device for leather production

Technical field

The invention relates to a heat recovery device, in particular to a drying heat recovery device for leather production.

Background technique

In the production process of polyurethane PU synthetic leather, the coating process is involved. The base fabric is coated with a composite slurry, and the base fabric coated with the composite slurry needs to be dried. The traditional composite slurry is an oil-based resin slurry. , The oil-based resin contains a lot of toxic and harmful gases, which will cause great harm to the environment and the operators. Moreover, the synthetic leather made of oil-based resin coatings will also contain toxic and harmful substances, which will also cause harm to consumers. The prior art has begun to use non-toxic and harmless water-based resins for base cloth coating. However, due to the large amount of water molecules in the water-based resins, traditional oven equipment is not sufficient to meet the drying requirements. Drying equipment for water-based resin drying, but the structure of this type of equipment is mostly designed as front and rear heating chambers, with a temperature gradient of 60-70°C, and then directly rise to 100-140°C. The problem with this design is the final synthesis Because of the rapid moisture loss, the leather has uneven surface cells, poor folding resistance and peeling performance; in addition, during the coating process, the base fabric is transported forward by the needle conveyor, and it is inevitable that the needle will detach during the conveying process. The situation of the base cloth. For this reason, we propose a drying heat recovery device for leather production.

Summary of the invention

The main purpose of the present invention is to provide a drying heat recovery device for leather production, which can effectively solve the problems in the background art.

In order to achieve the above objectives, the technical solutions adopted by the present invention are as follows:

A drying heat recovery device for leather production includes a conveying mechanism arranged inside an oven. The conveying mechanism is composed of two sets of symmetrically distributed needle conveyor belts. A supporting plate, at least one pressing device is fixedly connected to the supporting plate;

The oven is provided with at least three drying cavities, each drying cavity corresponding to the top of the oven is provided with an exhaust pipe, and the exhaust pipe N corresponding to the top of the end drying cavity N passes through the pipe and the starting end is dried The air outlet pipe A in the inner cavity A is connected, and the remaining drying inner cavities except the beginning end drying inner cavity A are equipped with steam heaters, and the steam heaters are respectively corresponding to those provided in each drying cavity The air outlet pipe B is connected, and both the air outlet pipe A and the air outlet pipe B are provided with air outlets.

Further, the needle conveyor belt includes a chain, and a plurality of support plates are distributed on the chain. The upper plate of the support plate is screwed into the threaded holes on the two pin shafts of the same link of the chain by two bolts. The lower edge plate of the support plate There are multiple vertical needles for welding.

Further, the pressing device includes a support frame fixed on the support plate, the upper end of the support frame is provided with a cylinder, the end of the cylinder piston rod is fixedly connected with a fixing block, and the fixing block is threadedly connected with the connecting rod, so The end of the connecting rod is fixedly connected with a pressure plate, and the pressure plate is placed above the lancet.

Further, the edge of the pressure plate is fixed with a ring of extruded parts composed of thin metal wires.

Further, the air outlet pipe A and the air outlet pipe B both include an upper air outlet pipe and a lower air outlet pipe, and the air outlets of the upper air outlet pipe and the lower air outlet pipe are relatively distributed.

Further, the cross section of the air outlet is in the shape of an isosceles trapezoid and the ends are sealed, and a plurality of air outlets are opened on both sides of the air outlet.

Further, the end of the air outlet is fixedly connected with a deflector, and both sides of the deflector are inclined.

Further, except for the exhaust pipe N corresponding to the drying cavity N at the end, the exhaust pipes corresponding to the remaining drying cavity are connected with the inlet pipe of the corresponding exhaust fan, and the outlet pipe of each exhaust fan is Connect with the exhaust gas treatment chamber.

Further, the exhaust gas treatment chamber is made of activated carbon.

Compared with the prior art, the present invention has the following beneficial effects:

1. Break through the existing two-chamber structure design and use multiple cavities to achieve temperature gradients. At the same time, as the number of drying cavities increases, the harmful exhaust gas discharged from the corresponding exhaust duct is processed in the first few drying cavities. The hot air discharged from the exhaust pipe of the end drying cavity N can be directly transmitted through the pipe to the outlet pipe in the beginning drying cavity A for preliminary drying, recycling heat and saving energy;

2. The pressing device is set up so that the base fabric and the needle on the needle conveyor are pressed tightly at the beginning of the needle conveyor belt, so that the needle passes through the base cloth to ensure the stability of the base cloth during the conveying process; The cylinder of the tightening device and the threaded coordination of the connecting rod and the fixed block realize the longitudinal and lateral adjustment of the pressing device, ensuring the effect of penetrating the needle, and the extruding part is used for pressure. The thin iron wire has a certain degree of rigidity and flexibility. , Without affecting the transmission of the base cloth, assist the base cloth to pass through the needle;

3. The side holes of the air outlet on the air outlet, instead of the bottom opening, blow directly to the base cloth, which protects the base cloth and avoids direct blowing to cause cracks, pits and other defects on the leather surface; another diversion The setting of the plate will guide the heat flow along the guide plate, and fully mix with the hot air from the adjacent guide plate, so that the temperature and wind force of the drying cavity of this section are relatively uniform, so that the synthetic leather drying and molding effect is stable , Consistent;

4. Except for the end drying cavity N, all the exhaust ducts from the drying cavity pass through the exhaust gas treatment chamber, and the harmful pollutants are discharged after adsorption treatment, which protects the environment.

Description of the drawings

Figure 1 is a schematic diagram of the overall structure of the drying heat recovery device for leather production of the present invention;

Figure 2 and Figure 3 are side views of the compacting device of the drying heat recovery device for leather production of the present invention;

Figure 4 is a schematic diagram of the conveying structure of the drying heat recovery device for leather production of the present invention (with base cloth);

Figure 5 is a partial enlarged schematic diagram of the conveying structure of the drying heat recovery device for leather production of the present invention;

6 is a schematic diagram of the connecting structure of the needle and the chain of the needle conveyor belt of the drying device for leather production of the present invention;

Figure 7 is a schematic diagram of the cooperating structure of the edge pressing device and the felting needle of the drying device for leather production of the present invention;

Figure 8 is a structural schematic diagram of the air outlet pipe A or the air outlet pipe B of the drying device for leather production of the present invention.

In the figure: 1. Oven; 2. Conveying mechanism; 3. Needle conveyor; 4. Support plate; 5. Compression device; 501, support frame; 502, cylinder; 503, fixed block; 504, connecting rod; 505, Pressure plate; 506, extruded parts; 7, initial drying cavity A; 8, air outlet pipe A; 9, steam heater; 10, air outlet pipe B; 11, air outlet; 12, end drying cavity N; 13, exhaust pipe N; 14, puncture needle; 15, air outlet; 16, deflector; 17, exhaust gas treatment chamber; 31, chain; 32, pallet.

detailed description

In order to make it easy to understand the technical means, creative features, objectives and effects achieved by the present invention, the present invention will be further explained below in conjunction with specific embodiments.

As shown in Figure 1-8, a drying heat recovery device for leather production includes a conveying mechanism 2 arranged inside the oven 1. The conveying mechanism 2 is composed of two symmetrically distributed needle conveyor belts 3 (two needle conveyor belts See Figure 4 for the direction of movement. Figure 4 is also the direction of base fabric conveying.) The needle conveyor belt 3 is placed on the work frame. The needle conveyor belt 3 includes a chain 31. The chain 31 is equidistantly distributed with pallets 32 on the pallets 32. The edge plate is threadedly locked in the threaded holes on the two pin shafts of the same section of the chain 31 by two bolts. A plurality of vertical puncture needles 14 are welded on the lower edge plate of the support plate 32. The transmission mode of the chain 31 is the prior art. The motor drives the gear to rotate, and the gear drives the chain to rotate; the starting end is placed on the outside of the oven 1 between the chains 31 of each set of needle conveyor belts 3, there is a support plate 4, and the design of the support plate 4 does not affect the transmission of the needle conveyor belt 3 This embodiment can be fixed on a work frame. Two pressing devices 5 are fixedly connected to the support plate 4, and the two pressing devices 5 are arranged in a straight line. The pressing device 5 includes a support frame fixed on the support plate 4. 501, the upper end of the support frame 501 is provided with a cylinder 502, the end of the piston rod of the cylinder 502 is fixedly connected with a fixed block 503, the fixed block 503 is threadedly connected with the connecting rod 504, the end of the connecting rod 504 is fixedly connected with a pressure plate 505, and the edge of the pressure plate 505 is provided with Extrusion piece 506, the edge of the pressure plate 505 is fixed with a circle of extruding piece 506 composed of thin metal wires. In this embodiment, the metal wire is a thin iron wire, and its length is 3 cm;

There are four drying cavities in the oven 1, specifically the beginning drying cavity A7, the drying cavity B, the drying cavity C, and the end drying cavity N12. The partitions made of thermal insulation materials are separated. The partitions are set so as not to affect the transmission of the needle conveyor 3 to avoid the temperature transfer between the drying cavities to a certain extent. The beginning of the drying cavity A7 corresponds to the oven 1 The top is equipped with exhaust pipe A, the drying cavity B corresponds to the top of the oven 1 is equipped with exhaust pipe B, and the drying cavity C corresponds to the oven 1 is equipped with exhaust pipe C at the top, and the end drying cavity N12 corresponds to The top of the oven 1 is provided with an exhaust pipe N13, and the exhaust pipe N13 corresponding to the top of the end drying cavity N12 is connected to the outlet pipe A8 in the beginning end drying cavity A7 through a pipe, except for the beginning end drying cavity A7 , The drying cavity B, the drying cavity C, and the end drying cavity N12 are equipped with steam heaters 9, respectively, and the steam heaters 9 are respectively connected with the air outlet pipes B10 provided in the respective drying cavities, Both the air outlet pipe A8 and the air outlet pipe B10 are provided with an air outlet 11, the air outlet pipe A8 and the air outlet pipe B10 both include an upper air outlet pipe and a lower air outlet pipe, and the air outlet 11 of the upper air outlet pipe and the lower air outlet pipe The air outlet 11 is relatively distributed. The cross section of the air outlet 11 is in the shape of an isosceles trapezoid and the ends are sealed. A plurality of air outlet holes 15 are opened on both sides of the air outlet. When the deflector 16 is installed at the air outlet 11 of the upper air outlet pipe, both sides of the deflector 16 are inclined upward. When the deflector 16 is installed at the outlet of the lower air outlet pipe When the air outlet 11 is located, the two sides of the deflector 16 are inclined downwards, that is, the air outlet 11 and the deflector 16 corresponding to the upper air outlet pipe and the lower air outlet pipe are relatively distributed, and the specific inclination angle α is 150°, Except for the exhaust pipe N13 corresponding to the end drying cavity N12, the exhaust pipe A, the exhaust pipe B and the exhaust pipe C are all connected to the corresponding intake pipes of the exhaust fan A, the exhaust fan B and the exhaust fan C. , The outlet ducts of the corresponding exhaust fan A, exhaust fan B and exhaust fan C are in communication with the exhaust gas treatment chamber 17, and the exhaust gas treatment chamber 17 is made of activated carbon.

It should be noted that the present invention is a drying heat recovery device for leather production. During operation, the base fabric to be dried is manually pulled and placed on the needle conveyor 3 at the beginning, and the edge of the base fabric is pressed and passed through the needle. 14. Then the oven 1 starts to work. While coating the slurry, the base fabric coated with the slurry will pass through the compaction device 5 during the transfer and drying process. The compaction device 5 will The distance, through the cylinder 502 (the model of the cylinder 502 is AirTACXQGB50×50-FA, and the connection method of the cylinder 502 is not improved, using the existing technology) to adjust the longitudinal distance between the pressure plate 505 and the base fabric, and through the connecting rod 504 and the fixed block 503 are screwed to adjust the lateral distance between the pressing plate 505 and the base cloth to ensure that the extruder 506 can just press the base cloth and make the needle 14 pass through the base cloth; after adjustment, when the base cloth passes by, The squeezing pieces 506 distributed on the platen 505 play the role of applying pressure, so that the puncture needle 14 pierces the base fabric, and then along with the needle conveyor 3 conveys to the beginning end drying cavity A7, the beginning end drying cavity A7 is dried The temperature is 40-60℃, and then it is transferred to the drying cavity B, the drying cavity C and the end drying cavity N12 in sequence. The temperatures of these three cavities are respectively 60℃-80℃, 80℃-120℃ and 120℃-140℃, after the hot air drying in the four drying cavities, the base fabric is drawn out of the oven 1 along with the needle conveyor 3, and a guide higher than the working shelf is set between the winding frame and the drying frame. Roller, so that the base fabric is separated from the needle 14 on the needle conveyor 2 to realize winding;

During this process, the exhaust pipe N13 of the end drying cavity N12 is connected to the outlet pipe A8 in the beginning drying cavity A7 through the pipe 6, to provide a heat source in the beginning drying cavity A8, and the temperature is controlled to 40 -60℃, to realize heat recycling, and the exhaust pipe A corresponding to the drying cavity A8 at the beginning, the exhaust pipe B corresponding to the drying cavity B, and the exhaust pipe C corresponding to the drying cavity C are corresponding to each The intake pipes of exhaust fan A, exhaust fan B and exhaust fan C are connected, and the corresponding exhaust pipes of exhaust fan A, exhaust fan B and exhaust fan C are connected with exhaust gas treatment chamber 17, and the exhaust gas is processed after the airflow is sucked out. After being discharged into the atmosphere;

The air outlet structure is designed so that the hot air in the air outlet pipe A8 and the air outlet pipe B10 is discharged through the side air outlet 15 and then the baffle plate 16 changes the direction of the hot air transfer and makes the temperature and wind force of the corresponding drying cavity relatively uniform At the same time, it can prevent the hot air from directly blowing on the base fabric to cause cracks, pits and other defects on the leather surface, which protects the base fabric.

The above refers to the temperature control method: the temperature in the drying cavity is determined by adjusting the air intake volume, which is generally controlled by a solenoid valve, and the specific temperature is fed back by the temperature sensor. It is not adjusted after the first adjustment in production. , Unless the technical parameters of the product to be dried are required; in addition, the above adjustment method is the existing technology.

The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. The above-mentioned embodiments and descriptions only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have Various changes and improvements, these changes and improvements all fall within the scope of the claimed invention. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

A drying heat recovery device for leather production, characterized in that it comprises a conveying mechanism (2) arranged inside an oven (1), and the conveying mechanism (2) is composed of two sets of symmetrically distributed needle conveyor belts (3) , A support plate (4) is provided between each set of needle conveyor belts (3) whose starting end is placed outside the oven (1), and at least one pressing device (5) is fixedly connected to the support plate (4);

The oven (1) is provided with at least three drying cavities, each drying cavity corresponding to the top of the oven (1) is equipped with an exhaust pipe, and the end of the drying cavity N (12) corresponds to the top of the row The air pipe N (13) is connected with the air outlet pipe A (8) in the beginning end drying cavity A (7) through the pipe (6), except for the beginning end drying cavity A (7) in the remaining drying cavity Each is provided with a steam heater (9), the steam heater (9) is respectively connected with the outlet pipe B (10) provided in each drying cavity, the outlet pipe A (8) and the outlet The air duct B (10) is provided with an air outlet (11).
The drying heat recovery device for leather production according to claim 1, characterized in that: the needle conveyor (3) includes a chain (31), and a plurality of pallets (32) are distributed on the chain (31) , The upper edge of the support plate (32) is screwed into the threaded holes on the two pins of the same section of the chain (31) through two bolts, and the lower edge of the support plate (32) is welded with multiple vertical needles ( 14).
The drying heat recovery device for leather production according to claim 2, characterized in that: the pressing device (5) comprises a supporting frame (501) fixed on a supporting plate (4), and the supporting frame The upper end of the cylinder (501) is provided with a cylinder (502), the end of the piston rod of the cylinder (502) is fixedly connected with a fixed block (503), and the fixed block (503) is threadedly connected with the connecting rod (504), and the connecting rod ( 504) The end is fixedly connected with a pressure plate (505), and the pressure plate (505) is placed above the lancet (14).
The drying heat recovery device for leather production according to claim 3, characterized in that: the edge of the pressure plate (505) is fixed with a circle of extruded parts (506) composed of thin metal wires.
The drying heat recovery device for leather production according to claim 1, characterized in that: the air outlet pipe A (8) and the air outlet pipe B (10) each include an upper air outlet pipe and a lower air outlet pipe In addition, the air outlets (11) of the upper air outlet pipe and the lower air outlet pipe are relatively distributed.
The drying heat recovery device for leather production according to claim 5, characterized in that: the cross section of the air outlet (11) is in the shape of an isosceles trapezoid and the ends are sealed, and both sides of the air outlet (11) are provided with multiple A vent (15).
The drying heat recovery device for leather production according to claim 6, characterized in that: the end of the air outlet (11) is fixedly connected with a deflector (16), and the two deflectors (16) The side is inclined.
The drying heat recovery device for leather production according to claim 1, characterized in that: except for the exhaust pipe N(13) corresponding to the end drying cavity N(12), the remaining drying cavity The corresponding exhaust pipes are all connected with the air inlet pipes of the corresponding exhaust fans, and the air outlet pipes of each exhaust fan are all connected with the exhaust gas treatment chamber (17).
The drying heat recovery device for leather production according to claim 8, wherein the exhaust gas treatment chamber (17) is made of activated carbon.