A liquid catalyst adding device for producing polyurethane resin for leather

Abstract

The utility model relates to the field of chemical equipment, and specifically discloses a liquid catalyst adding device for producing polyurethane resin for leather, which comprises a catalyst buffer tank, wherein a feed end of the catalyst buffer tank is connected with a feed assembly, a discharge end of the catalyst buffer tank is connected with a catalyst feeding pipe, the catalyst feeding pipe is connected with an inlet end of a feeding pump, and the feeding pump is connected with a reactor through the feeding assembly. The utility model monitors the weight of the catalyst buffer tank in real time through a weighing sensor module, and when the catalyst in the catalyst buffer tank is pumped out, the change in weight directly reflects the amount of the pumped catalyst, thereby being able to accurately control the amount of added catalyst, and then by nitrogen purging, all the catalyst remaining on the inner wall of the catalyst feeding pipe is fed into the reactor, thereby avoiding the problem of incomplete feeding due to catalyst adhesion, and ensuring that all the catalyst leaving the catalyst buffer tank can be put into the reactor.

Description

Technical Field

[0001] The utility model relates to the field of chemical equipment, and specifically designs a liquid catalyst adding device for producing polyurethane resin for leather. Background Art

[0002] Solvent-based polyurethane resin for leather is a type of polyurethane, which is widely used in the fields of clothing leather, luggage leather, shoe leather, furniture leather, etc. During its production process, in order to cope with the problems of low reactivity of individual raw materials such as isophorone diisocyanate or toluene diisocyanate and long production hours, an appropriate amount of liquid catalyst is added in actual production to increase the reaction activity and improve production efficiency.

[0003] In industrial production, the addition operation of liquid catalysts generally adopts the method of transporting the catalyst in the storage tank to the reactor through a pumping system. In order to accurately control the amount of catalyst added, a liquid level gauge is usually installed on the storage tank of the liquid catalyst. This can monitor the amount of remaining catalyst in the storage tank in real time and replenish the catalyst in time. At the same time, the change of liquid level can also reflect the amount of catalyst added in real time.

[0004] In the process of adding liquid catalyst to the reactor, since the liquid catalyst has a certain viscosity, on the one hand, the catalyst adheres to the inner wall of the feeding pipe, resulting in the actual addition amount being less than the target addition amount, which will affect the effect of the catalytic reaction and thus reduce production efficiency. On the other hand, as the liquid catalyst leaves the storage tank, the liquid level in the tank will drop. However, since the liquid catalyst will adhere to the inner wall of the tank body, the volume of catalyst leaving the tank detected by the liquid level meter will be greater than the actual volume leaving. This will not only directly affect the accuracy of adding the catalyst to the reactor, but will also easily lead to the problem of over-addition when replenishing the catalyst. Based on this, the inventor purposefully provides a liquid catalyst adding device for the production of leather polyurethane resin, which can accurately reflect the amount of liquid catalyst added and precisely add liquid catalyst. Utility Model Content

[0005] The purpose of the utility model is to address the deficiencies in the prior art and to provide a liquid catalyst adding device for the production of leather polyurethane resin, which can accurately reflect the amount of liquid catalyst added and precisely add liquid catalyst, so as to solve the problem in the prior art that the liquid catalyst adheres to the inner wall of the tank body, causing the volume of catalyst leaving the tank body detected by the liquid level meter to be greater than the actual volume leaving, which directly affects the accuracy of adding the catalyst into the reactor.

[0006] The purpose of the utility model can be achieved through the following technical solutions:

[0007] A liquid catalyst adding device for producing polyurethane resin for leather comprises a catalyst buffer tank, wherein a feed assembly is connected to a feed end of the catalyst buffer tank, a discharge end of the catalyst buffer tank is connected to a catalyst feeding pipe, a catalyst feeding pipe is connected to an inlet end of a feeding pump, the feeding pump is connected to a reactor through a feeding assembly, the horizontal height of the reactor is lower than the horizontal height of the catalyst buffer tank, a weighing sensor module is fixedly installed at the bottom of the catalyst buffer tank, the weighing sensor module is fixedly installed on a base, the catalyst feeding pipe is connected to an air blowing pipe, the air blowing pipe is connected to an external air supply device, a second pneumatic valve is provided at the connection between the catalyst buffer tank and the catalyst feeding pipe, the connection between the air blowing pipe and the catalyst feeding pipe is located between the second pneumatic valve and the feeding pump, an opening and closing valve is provided on the air blowing pipe, the second pneumatic valve and the opening and closing valve are opened and closed alternately, and the weighing sensor module, the second pneumatic valve, the opening and closing valve and the feeding pump are all connected to an external control box.

[0008] As a further optimization or improvement of this solution.

[0009] The feeding assembly includes a three-way stop valve, a first feed pipe and a second feed pipe. The feed inlet end of the three-way stop valve is connected to the feed outlet end of the feeding pump, and the two discharge ends of the three-way stop valve are respectively connected to the first feed pipe and the second feed pipe. The first feed pipe and the second feed pipe are respectively connected to two reaction kettles, and the three-way stop valve is connected to an external control box.

[0010] As a further optimization or improvement of this solution.

[0011] The first material conveying pipe and the second material conveying pipe are both provided with a third manual valve and a third pneumatic valve, and the third manual valve is located between the third pneumatic valve and the reaction kettle, and the third pneumatic valve is connected to an external control box.

[0012] As a further optimization or improvement of this solution.

[0013] The feed assembly includes a catalyst storage tank, a feed pipe and a feed pump. The feed end of the feed pump is connected to the discharge end of the catalyst storage tank. The feed pump is connected to the catalyst buffer tank through the feed pipe. A second manual valve is provided at the connection between the feed pump and the catalyst storage tank. A first pneumatic valve is provided at the connection between the feed pipe and the catalyst buffer tank. The first pneumatic valve is connected to an external control box.

[0014] As a further optimization or improvement of this solution.

[0015] The feed end of the catalyst storage tank is connected to a pumping pipe, a first manual valve is arranged on the pumping pipe, and the pumping pipe is connected to an external feeding device.

[0016] Beneficial effects of the utility model:

[0017] 1. The utility model monitors the weight of the catalyst buffer tank in real time through a weighing sensor module. When the catalyst in the catalyst buffer tank is pumped out, the change in weight directly reflects the amount of the pumped catalyst, thereby being able to accurately control the amount of catalyst added, and avoiding the problem that when the catalyst liquid level drops, the catalyst adheres to the catalyst buffer tank, resulting in the liquid level failing to reflect the actual amount of catalyst added. Nitrogen is introduced into the catalyst feeding pipe through a blowing pipe, and nitrogen is purged every 30 seconds, each time for 30 seconds, for a total of 3 times, to ensure that all the catalyst remaining on the inner wall of the catalyst feeding pipe is fed into the reactor, avoiding the problem of incomplete feeding due to catalyst adhesion, ensuring that all the catalyst leaving the catalyst buffer tank can be put into the reactor, and further ensuring the accuracy of catalyst addition.

[0018] 2. The utility model sets the level of the catalyst buffer tank higher than the level of the reactor, ensuring that the pipeline connecting the two is from top to bottom. During the nitrogen purge process, it is easier for the purged catalyst to flow into the reactor under the action of gravity.

[0019] 3. The utility model connects the first feed pipe and the second feed pipe with the feed pump through a three-way stop valve. The liquid catalysts in different reactors can be quickly added by controlling the opening and closing of the outlet of the three-way stop valve, thus reducing excessive repetitive operations. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The utility model is further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0022] Figure 2 It is a schematic diagram of the cross-sectional structure of the feed pipe of the utility model.

[0023] The figure shows:

[0024] 1. Catalyst storage tank; 2. Extraction pipe; 3. First manual valve; 4. Second manual valve; 5. Feed pump; 6. Feed pipe; 7. First pneumatic valve; 8. Catalyst buffer tank; 9. Weighing sensor module; 10. Catalyst feeding pipe; 11. Second pneumatic valve; 12. Feed pump; 13. Three-way stop valve; 14. First feed pipe; 15. Third pneumatic valve; 16. Third manual valve; 17. Reactor; 18. Feed inlet; 19. Discharge port; 20. Base; 21. Heating pipe; 22. Air blowing pipe; 23. Opening and closing valve; 24. Second feed pipe. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] See also Figure 1-Figure 2 A liquid catalyst adding device for producing leather polyurethane resin comprises a catalyst buffer tank 8, wherein the feed end of the catalyst buffer tank 8 is connected to a feed assembly, the discharge end of the catalyst buffer tank 8 is connected to a catalyst feeding pipe 10, the catalyst feeding pipe 10 is connected to the feed end of a feeding pump 12, the feeding pump 12 is connected to a reactor 17 through a feeding assembly, the level of the reactor 17 is lower than the level of the catalyst buffer tank 8, a weighing sensor module 9 is fixedly installed at the bottom of the catalyst buffer tank 8, and the weighing sensor module 9 is fixedly installed. Installed on the base 20, the catalyst feeding pipe 10 is connected to the blowing pipe 22, the blowing pipe 22 is connected to the external air supply equipment, a second pneumatic valve 11 is provided at the connection between the catalyst buffer tank 8 and the catalyst feeding pipe 10, the connection between the blowing pipe 22 and the catalyst feeding pipe 10 is located between the second pneumatic valve 11 and the feeding pump 12, an opening and closing valve 23 is provided on the blowing pipe 22, the second pneumatic valve 11 and the opening and closing valve 23 are opened and closed alternately, and the weighing sensor module 9, the second pneumatic valve 11, the opening and closing valve 23 and the feeding pump 12 are all connected to the external control box.

[0027] In a specific embodiment, a feed port 18 is provided above the reactor 17, and a discharge port 19 is provided below the reactor 17. It should be noted that the feeding pump 12, the second pneumatic valve 11, the opening and closing valve 23 and the weighing sensor module 9 described in the present application are all prior arts, and the present application does not improve them. Therefore, there is no need to disclose their specific mechanical structure and circuit structure, which does not affect the integrity of the present application; the external control box includes a PLC control system, a circuit board, a relay, etc., and the external gas supply equipment includes a nitrogen delivery pipeline and an air pump. The above components are all prior arts, and the specific models are not disclosed in the present utility model, which does not affect the integrity of the present utility model.

[0028] The working principle of the utility model is as follows: first, the raw materials for the production of leather polyurethane resin are put into the reactor 17 through the feed port 18. When the catalyst cached in the catalyst buffer tank 8 needs to be added to the reactor 17, the external control box controls the second pneumatic valve 11 and the feeding pump 12 to open, and the on-off valve 23 to close. The catalyst cached in the catalyst buffer tank 8 is pumped into the catalyst feeding pipe 10 through the feeding pump 12, and pumped to the feeding assembly, and finally transported to the reactor 17 to complete the task of adding the catalyst. The external control box monitors the weight of the catalyst buffer tank 8 in real time through the weighing sensor module 9. When the catalyst in the catalyst buffer tank 8 is pumped out, the change in weight directly reflects the amount of pumped catalyst, so that the amount of added catalyst can be accurately controlled, and the change in the amount of catalyst in the catalyst buffer tank 8 can be reflected by weight, so as to avoid the catalyst from being overcrowded. When the catalyst level drops, the catalyst adheres to the catalyst buffer tank 8, resulting in the problem that the liquid level cannot reflect the actual amount of catalyst added. After completing the task of adding the catalyst, the external control box immediately controls the second pneumatic valve 11 to close, and the on-off valve 23 to open. At this time, the nitrogen in the nitrogen delivery pipeline is introduced into the catalyst feeding pipe 10 through the blowing pipe 22. The nitrogen is purged every 30 seconds, each time for 30 seconds, and a total of 3 times to ensure that all the catalyst remaining on the inner wall of the catalyst feeding pipe 10 is sent to the reactor 17, avoiding the problem of incomplete feeding due to catalyst adhesion, and ensuring that the catalyst leaving the catalyst buffer tank 8 can be fully put into the reactor 17, further ensuring the accuracy of adding the catalyst. When the production of the leather polyurethane resin in the reactor 17 is completed, the material can be discharged through the discharge port 19.

[0029] Moreover, the level of the catalyst buffer tank 8 is higher than that of the reactor 17, which means that the pipeline connecting the two is from top to bottom, and during the nitrogen purging process, it is easier for the purged catalyst to flow into the reactor 17 under the action of gravity.

[0030] Specifically, the feeding assembly includes a three-way stop valve 13, a first feed pipe 14 and a second feed pipe 24. The feed inlet end of the three-way stop valve 13 is connected to the feed outlet end of the feeding pump 12, and the two discharge ends of the three-way stop valve 13 are respectively connected to the first feed pipe 14 and the second feed pipe 24. The first feed pipe 14 and the second feed pipe 24 are respectively connected to two reaction kettles 17, and the three-way stop valve 13 is connected to an external control box.

[0031] In a specific embodiment, the three-way stop valve 13 is a prior art, and the specific model is not disclosed in the present invention, which does not affect the integrity of the present invention; the first feed pipe 14 and the second feed pipe 24 are connected to the feeding pump 12 through the three-way stop valve 13, and the liquid catalyst of different reaction kettles 17 can be quickly added by controlling the opening and closing of the outlet of the three-way stop valve 13, thereby reducing excessive repetitive operations.

[0032] More specifically, the first material delivery pipe 14 and the second material delivery pipe 24 are both provided with a third manual valve 16 and a third pneumatic valve 15, and the third manual valve 16 is located between the third pneumatic valve 15 and the reaction kettle 17, and the third pneumatic valve 15 is connected to an external control box.

[0033] In a specific embodiment, the third pneumatic valve 15 and the third manual valve 16 are both prior arts, and the specific models are not disclosed in the present invention, which does not affect the integrity of the present invention; by arranging the third pneumatic valve 15 and the third manual valve 16 on the first feed pipe 14 and the second feed pipe 24, the safety of conveying the liquid catalyst can be improved, and the third manual valve 16 is manually operated, which further increases the manual participation in adding the liquid catalyst. Ultimately, it is controlled by humans whether to add the catalyst to prevent the addition of the liquid catalyst due to accidental touching of the switch.

[0034] At the same time, it should be noted that the feed assembly includes a catalyst storage tank 1, a feed pipe 6 and a feed pump 5. The feed end of the feed pump 5 is connected to the discharge end of the catalyst storage tank 1, and the feed pump 5 is connected to the catalyst cache tank 8 through the feed pipe 6. A second manual valve 4 is provided at the connection between the feed pump 5 and the catalyst storage tank 1, and a first pneumatic valve 7 is provided at the connection between the feed pipe 6 and the catalyst cache tank 8. The first pneumatic valve 7 is connected to the external control box.

[0035] In a specific embodiment, the second manual valve 4, feed pump 5 and first pneumatic valve 7 are all prior arts. The specific models are not disclosed in the present utility model, which does not affect the integrity of the present utility model. The external control box monitors the weight of the catalyst cache tank 8 in real time through the weighing sensor module 9, that is, it reflects the amount of remaining catalyst in the catalyst cache tank 8. When the amount is lower than the threshold, it is necessary to manually open the second manual valve 4, and then the external control box will control the feed pump 5 and the first pneumatic valve 7 to open synchronously, so that the liquid catalyst in the catalyst storage tank 1 is pumped into the catalyst cache tank 8 through the feed pipe 6, and the amount of liquid catalyst in the catalyst cache tank 8 is replenished in time.

[0036] More specifically, the feed end of the catalyst storage tank 1 is connected to a pumping pipe 2 , a first manual valve 3 is provided on the pumping pipe 2 , and the pumping pipe 2 is connected to an external feed device.

[0037] In a specific embodiment, the external feeding equipment can be set as a liquid catalyst production pipeline. The above-mentioned components and the first manual valve 3 are all prior art. The specific models are not disclosed in the utility model, which does not affect the integrity of the utility model. When the first manual valve 3 is manually opened, the liquid catalyst in the catalyst storage tank 1 can be replenished in time through the pumping pipe 2.

[0038] At the same time, it should be noted that the first manual valve 3, the feed pipe 6, the catalyst feeding pipe 10, the first delivery pipe 14 and the second delivery pipe 24 are all provided with a heating pipe 21 for maintaining the temperature in each pipe, thereby avoiding the problem of extended working time caused by crystallization of the liquid catalyst under low temperature conditions.

[0039] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A liquid catalyst adding device for producing polyurethane resin for leather, characterized in that: The catalyst buffer tank (8) comprises a catalyst buffer tank (8), wherein a feed end of the catalyst buffer tank (8) is connected to a feed assembly, a discharge end of the catalyst buffer tank (8) is connected to a catalyst feed pipe (10), the catalyst feed pipe (10) is connected to an inlet end of a feed pump (12), the feed pump (12) is connected to a reactor (17) via the feed assembly, the horizontal height of the reactor (17) is lower than the horizontal height of the catalyst buffer tank (8), a weighing sensor module (9) is fixedly mounted on the bottom of the catalyst buffer tank (8), the weighing sensor module (9) is fixedly mounted on a base (20), and the catalyst feed pipe (10) is connected to a catalyst feed pipe (10). 0) is connected to an air blowing pipe (22), the air blowing pipe (22) is connected to an external air supply device, a second pneumatic valve (11) is provided at the connection between the catalyst buffer tank (8) and the catalyst feeding pipe (10), the connection between the air blowing pipe (22) and the catalyst feeding pipe (10) is located between the second pneumatic valve (11) and the feeding pump (12), an opening and closing valve (23) is provided on the air blowing pipe (22), the second pneumatic valve (11) and the opening and closing valve (23) are opened and closed alternately, and the weighing sensor module (9), the second pneumatic valve (11), the opening and closing valve (23) and the feeding pump (12) are all connected to an external control box.

2. The liquid catalyst adding device for producing polyurethane resin for leather according to claim 1, characterized in that: The feeding assembly comprises a three-way stop valve (13), a first feeding pipe (14) and a second feeding pipe (24); the feeding end of the three-way stop valve (13) is connected to the feeding end of the feeding pump (12); the two feeding ends of the three-way stop valve (13) are respectively connected to the first feeding pipe (14) and the second feeding pipe (24); the first feeding pipe (14) and the second feeding pipe (24) are respectively connected to two reaction kettles (17); and the three-way stop valve (13) is connected to an external control box.

3. The liquid catalyst adding device for producing polyurethane resin for leather according to claim 2, characterized in that: The first material delivery pipe (14) and the second material delivery pipe (24) are both provided with a third manual valve (16) and a third pneumatic valve (15), and the third manual valve (16) is located between the third pneumatic valve (15) and the reaction kettle (17), and the third pneumatic valve (15) is connected to an external control box.

4. The liquid catalyst adding device for producing polyurethane resin for leather according to claim 1, characterized in that: The feed assembly comprises a catalyst storage tank (1), a feed pipe (6) and a feed pump (5); a feed end of the feed pump (5) is connected to a discharge end of the catalyst storage tank (1); the feed pump (5) is connected to a catalyst buffer tank (8) via the feed pipe (6); a second manual valve (4) is provided at the connection between the feed pump (5) and the catalyst storage tank (1); a first pneumatic valve (7) is provided at the connection between the feed pipe (6) and the catalyst buffer tank (8); and the first pneumatic valve (7) is connected to an external control box.

5. The liquid catalyst adding device for producing polyurethane resin for leather according to claim 4, characterized in that: The feed end of the catalyst storage tank (1) is connected to a feed extraction pipe (2), a first manual valve (3) is provided on the feed extraction pipe (2), and the feed extraction pipe (2) is connected to an external feed device.

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