Automatic control device and control method for residual heat quenching water tank

Abstract

The present invention belongs to the field of automatic control technology, and specifically relates to an automatic control device and control method for a waste heat quenching water tank. The automatic control device for a waste heat quenching water tank includes a control cabinet, a water tank, a cooling pump, a spray pump, and at least one water tank heat exchanger. A water inlet control valve is installed on the cooling water inlet pipe of the water tank heat exchanger; a cooling pump is installed on the quenching liquid inlet pipe of the water tank heat exchanger; and the control cabinet controls and connects the water inlet control valve, the cooling pump, and the spray pump. On the one hand, the present invention can realize the automatic adjustment of the quenching liquid temperature in the water tank, maintain the quenching liquid temperature in the water tank relatively stable, thereby ensuring the quenching quality of the product; on the other hand, by adopting a phase separation method of the cooling pump and the spray pump, the damage problem caused by the original water pump always running at full power can be avoided; the start and stop, the number of starts and the power state of the water pump can be automatically controlled according to the actual working conditions, thereby saving energy and truly realizing automatic control.

Description

Technical Field

[0001] The invention belongs to the technical field of automatic control, and in particular relates to an automatic control device for a waste heat quenching water tank. Background Art

[0002] The quenching liquid in the waste heat quenching water tank of the automated production line is in an open cooling state. On the one hand, the quenching liquid temperature cannot be automatically controlled, which is not conducive to the stability of the product quenching quality and easily causes batch scrapping of products; on the other hand, the quenching liquid cooling and spraying pump of the water tank is always running at full power, which not only wastes energy but also easily damages the water pump; furthermore, the water tank is at the end of the product automated production line, and operations such as start and stop cannot be linked with the robot, requiring human intervention, wasting time and affecting production. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide an automatic control device for a waste heat quenching water tank that can automatically adjust the temperature of the quenching liquid in the water tank, is conducive to the stability of the product quenching quality, can realize automatic start and stop control and state adjustment according to actual working conditions, and is conducive to energy saving.

[0004] In order to achieve the above technical objectives, the technical solution adopted by the present invention is:

[0005] Automatic control device for waste heat quenching water tank, including:

[0006] A water tank for storing quenching liquid;

[0007] A water tank heat exchanger, wherein the water tank heat exchanger is provided with a cooling water inlet, a cooling water outlet, a quenching liquid inlet, and a quenching liquid outlet. The cooling water inlet is connected to the water inlet main of the circulation system through a cooling water inlet pipe, the cooling water outlet is connected to the water return main of the circulation system through a cooling water return pipe, the quenching liquid inlet is connected to the water tank through a quenching liquid inlet pipe, and the quenching liquid outlet is connected to the water tank through a quenching liquid outlet pipe;

[0008] The water inlet control valve is installed on the cooling water inlet pipe of the water tank heat exchanger;

[0009] A cooling pump is installed on the quenching liquid inlet pipe;

[0010] A spray pipe is arranged in the water tank, and a plurality of spray holes are opened on the spray pipe;

[0011] A spray pump, wherein the liquid inlet of the spray pump is connected to the water tank, and the liquid outlet of the spray pump is connected to the spray pipe;

[0012] A control cabinet is provided with a temperature detection system and a temperature setting system. The temperature detection system is connected to the water tank and is used to measure the actual temperature of the quenching liquid in the water tank in real time. The temperature setting system is used to set the set temperature of the quenching liquid in the water tank. The control cabinet controls the connection of the water inlet control valve, the cooling pump and the spray pump.

[0013] As a preferred technical solution, the water tank heat exchanger includes a first water tank heat exchanger and a second water tank heat exchanger, and the first water tank heat exchanger and the second water tank heat exchanger are arranged in parallel.

[0014] As a preferred technical solution, a first water inlet control valve is installed on the cooling water inlet pipe of the first water tank heat exchanger, and a first cooling pump is installed on the quenching liquid inlet pipe of the first water tank heat exchanger; a second water inlet control valve is installed on the cooling water inlet pipe of the second water tank heat exchanger, and a second cooling pump is installed on the quenching liquid inlet pipe of the second water tank heat exchanger.

[0015] As a preferred technical solution, the quenching liquid inlet pipes of the first water tank heat exchanger and the second water tank heat exchanger are respectively installed with liquid inlet temperature measuring rods.

[0016] As a preferred technical solution, outlet temperature measuring rods are respectively installed on the quenching liquid outlet pipes of the first water tank heat exchanger and the second water tank heat exchanger.

[0017] As a preferred technical solution, a temperature display screen is provided on the control cabinet.

[0018] The present invention also provides a control method using the above-mentioned waste heat quenching water tank automatic control device, comprising the following steps:

[0019] S1. Set the temperature of the quenching liquid in the water tank according to the process requirements;

[0020] S2. During normal production, if the actual temperature of the quenching liquid in the water tank is equal to or lower than the set temperature, the first cooling pump, the first water tank heat exchanger, the second cooling pump, and the second water tank heat exchanger all stop working, the first water inlet control valve and the second water inlet control valve are closed, and the spray pump operates normally. The quenching liquid in the water tank is output to the spray pipe through the spray pump and sprayed out through the spray pipe;

[0021] If there is no production during the shift, the first cooling pump, the first water tank heat exchanger, the second cooling pump and the second water tank heat exchanger will not work. At this time, the spray pump controls the flow rate to achieve low-power operation, thereby reducing energy consumption;

[0022] S3. When the actual temperature of the quenching liquid in the water tank is higher than the set temperature, the control cabinet controls the first cooling pump to start, the first water inlet control valve to open, and the first water tank heat exchanger to work synchronously. The quenching liquid in the water tank flows from the quenching liquid inlet into the first water tank heat exchanger through the first cooling pump. At the same time, the circulating cooling water of the water inlet main pipe of the circulation system flows from the cooling water inlet into the first water tank heat exchanger through the first water inlet control valve. After the circulating cooling water exchanges heat with the quenching liquid, the circulating cooling water flows back to the return water main pipe of the circulation system from the cooling water outlet. The cooled quenching liquid flows back to the water tank from the quenching liquid outlet. The first cooling pump controls the flow rate to reduce the degree of the quenching liquid temperature. This cycle is repeated until the actual temperature of the quenching liquid in the water tank is consistent with the set temperature.

[0023] S4. If the actual temperature of the quenching liquid in the water tank is still higher than the set temperature after the circulation, that is, the first cooling pump still cannot meet the cooling requirement when running at full power, the control cabinet controls the second cooling pump to start, the second water inlet control valve to open, and the second water tank heat exchanger to work synchronously. At this time, the first cooling pump and the second cooling pump jointly achieve the degree of cooling of the quenching liquid by controlling the flow rate. The cycle is repeated until the actual temperature of the quenching liquid in the water tank is consistent with the set temperature.

[0024] Due to the adoption of the above technical solution, the present invention has at least the following beneficial effects:

[0025] (1) The cooling pump and the spray pump are cleverly separated to ensure normal operation while avoiding the damage caused by the original cooling and spray pump always running at full power;

[0026] (2) According to the actual production conditions and the actual temperature of the quenching liquid, the start and stop of the cooling pump, the number of starts, and the power status of the spray pump and the cooling pump can be automatically controlled, thereby saving energy, reducing carbon emissions, and increasing economic and social benefits.

[0027] (3) By rationally designing the cooling circulation pipeline, spray pipeline and supporting equipment, the temperature of the quenching liquid in the water tank can be automatically adjusted to keep the temperature of the quenching liquid in the water tank relatively stable, so that it can continuously meet the process requirements, thereby ensuring the quenching quality of the product and reducing the product scrap rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following drawings are intended only to illustrate and explain the present invention, and are not intended to limit the scope of the present invention.

[0029] Figure 1 Schematic diagram of the structure of the automatic control device for the waste heat quenching water tank provided by an embodiment of the present invention;

[0030] Figure 2 2 is a control principle diagram of an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The present invention will be further described below with reference to the accompanying drawings and examples. In the following detailed description, certain exemplary embodiments of the present invention are described by way of illustration only. It is understood that those skilled in the art will recognize that the described embodiments may be modified in various ways without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and are not intended to limit the scope of the claims.

[0032] like Figure 1 As shown, the automatic control device for the waste heat quenching water tank includes a control cabinet 1, a water tank 2, and at least one water tank heat exchanger. The water tank 2 is used to store quenching liquid. A spray pipe 11 is provided in the water tank 2, and a plurality of spray holes are opened on the spray pipe 11. A spray pump 12 is installed outside the water tank 2, and the liquid inlet of the spray pump 12 is connected to the water tank 2, and the liquid outlet of the spray pump 12 is connected to the spray pipe 11.

[0033] In this embodiment, two water tank heat exchangers are provided, namely a first water tank heat exchanger 3 and a second water tank heat exchanger 4 , and the first water tank heat exchanger 3 and the second water tank heat exchanger 4 are provided in parallel.

[0034] Taking the first water tank heat exchanger 3 as an example, it is provided with a cooling water inlet 31, a cooling water outlet 32, a quenching liquid inlet 33 and a quenching liquid outlet 34. The cooling water inlet 31 is connected to the circulation system water inlet main 5 through a cooling water inlet pipe, the cooling water outlet 32 ​​is connected to the circulation system return water main 6 through a cooling water return pipe, the quenching liquid inlet 33 is connected to the water tank 1 through a quenching liquid inlet pipe, and the quenching liquid outlet 34 is connected to the water tank 1 through a quenching liquid outlet pipe;

[0035] A first water inlet control valve 7 is installed on the cooling water inlet pipe of the first water tank heat exchanger 3, and a first cooling pump 8 is installed on the quenching liquid inlet pipe of the first water tank heat exchanger 3. A second water inlet control valve 9 is installed on the cooling water inlet pipe of the second water tank heat exchanger 4, and a second cooling pump 10 is installed on the quenching liquid inlet pipe of the second water tank heat exchanger 4. The first water inlet control valve 7 and the second water inlet control valve 9 are preferably electric valves.

[0036] The quenching liquid inlet pipes of the first water tank heat exchanger 3 and the second water tank heat exchanger 4 are respectively installed with an inlet temperature measuring rod 13. The quenching liquid outlet pipes of the first water tank heat exchanger 3 and the second water tank heat exchanger 4 are respectively installed with an outlet temperature measuring rod 14.

[0037] The control cabinet 1 is provided with a temperature detection system and a temperature setting system. The temperature detection system is connected to the water tank 2 and can measure the actual temperature of the quenching liquid in the water tank 2 in real time. The temperature setting system is used to set the set temperature of the quenching liquid in the water tank. The control cabinet 1 is provided with a temperature display screen to display the actual temperature of the quenching liquid and the set temperature of the quenching liquid.

[0038] The control cabinet 1 controls the connection of the first water inlet control valve 7, the first cooling pump 8, the second water inlet control valve 9, the second cooling pump 10 and the spray pump 12. According to actual working conditions, the control cabinet 1 can control the opening or closing of the first water inlet control valve 7 and the second water inlet control valve 9, as well as the start and stop and power status of the first cooling pump 8, the second cooling pump 10 and the spray pump 12.

[0039] refer to Figure 2 , the control method comprises the following steps:

[0040] S1. According to the process requirements, set the temperature T1 of the quenching liquid in the water tank 1;

[0041] S2. During normal production, if the actual temperature T2 of the quenching liquid in the water tank is equal to or lower than the set temperature T1, the first cooling pump 8, the first water tank heat exchanger 3, the second cooling pump 10, and the second water tank heat exchanger 4 all stop working, the first water inlet control valve 7 and the second water inlet control valve 9 are in the closed state, and the spray pump 12 operates normally. The quenching liquid in the water tank is output to the spray pipe 11 through the spray pump 12 and sprayed out through the spray pipe 11;

[0042] If there is no production during the shift, the first cooling pump 8, the first water tank heat exchanger 3, the second cooling pump 10 and the second water tank heat exchanger 4 are all not working. At this time, the spray pump 12 controls the flow rate to achieve low-power operation, thereby reducing energy consumption;

[0043] S3. When the actual temperature T2 of the quenching liquid in the water tank 1 is higher than the set temperature T1, the control cabinet 1 controls the first cooling pump 8 to start, the first water inlet control valve 7 to open, and the first water tank heat exchanger 3 to work synchronously. The quenching liquid in the water tank flows into the first water tank heat exchanger 3 from the quenching liquid inlet 33 through the first cooling pump 8. At the same time, the circulating cooling water of the circulation system water inlet main pipe 5 flows into the first water tank heat exchanger 3 from the cooling water inlet 31 through the first water inlet control valve 7. After the circulating cooling water exchanges heat with the quenching liquid, the circulating cooling water flows back to the circulation system return water main pipe 6 from the cooling water outlet 32. The cooled quenching liquid flows back to the water tank 1 from the quenching liquid outlet 34. The first cooling pump 8 controls the flow rate to reduce the degree of the quenching liquid temperature. This cycle is repeated until the actual temperature T2 of the quenching liquid in the water tank 1 is consistent with the set temperature T1.

[0044] S4. If, after the circulation, the actual temperature T2 of the quenching liquid in the water tank 1 is still higher than the set temperature T1, that is, the first cooling pump 8 still cannot meet the temperature reduction requirement when operating at full power, the control cabinet 1 controls the second cooling pump 10 to start, the second water inlet control valve 9 to open, and the second water tank heat exchanger 4 to work synchronously. At this time, the first cooling pump 8 and the second cooling pump 10 jointly achieve the degree of temperature reduction of the quenching liquid by controlling the flow rate. The cycle is repeated until the actual temperature T2 of the quenching liquid in the water tank 1 is finally consistent with the set temperature T1.

[0045] If the temperature difference detected by the liquid inlet temperature measuring rod 13 and the liquid outlet temperature measuring rod 14 is not large, it means that there are too many impurities in the water tank heat exchanger and it can no longer achieve the cooling effect. The water tank heat exchanger can be used normally again after cleaning.

[0046] In summary, the present invention can, on the one hand, realize automatic adjustment of the temperature of the quenching liquid in the water tank, maintain the temperature of the quenching liquid in the water tank relatively stable, and make it continuously meet the process requirements, thereby ensuring the quenching quality of the product and reducing the scrap rate of the product. On the other hand, by cleverly adopting the phase separation of the cooling pump and the spray pump, while ensuring normal operation, it can avoid the damage problem caused by the original cooling and spray pump always running at full power; and it can automatically control the start and stop of the cooling pump, the number of starts, and the power status of the spray pump and the cooling pump according to the actual working conditions of production and the actual temperature of the quenching liquid, thereby saving energy, reducing carbon emissions, and increasing economic and social benefits. Using this set of automatic devices, the start and stop operations do not require human intervention, and can be adjusted automatically according to the actual temperature, which will not affect normal production, and truly realize automation.

[0047] The above description is merely an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Therefore, it should not be understood as limiting the present invention. Any equivalent changes and modifications made by those skilled in the art without departing from the concept and principle of the present invention should fall within the scope of protection of the present invention.

Claims

1. Automatic control device for waste heat quenching water tank, characterized in that: include: A water tank for storing quenching liquid; A water tank heat exchanger, wherein the water tank heat exchanger is provided with a cooling water inlet, a cooling water outlet, a quenching liquid inlet, and a quenching liquid outlet. The cooling water inlet is connected to the water inlet main of the circulation system through a cooling water inlet pipe, the cooling water outlet is connected to the water return main of the circulation system through a cooling water return pipe, the quenching liquid inlet is connected to the water tank through a quenching liquid inlet pipe, and the quenching liquid outlet is connected to the water tank through a quenching liquid outlet pipe; The water inlet control valve is installed on the cooling water inlet pipe of the water tank heat exchanger; A cooling pump is installed on the quenching liquid inlet pipe; A spray pipe is arranged in the water tank, and a plurality of spray holes are opened on the spray pipe; A spray pump, wherein the liquid inlet of the spray pump is connected to the water tank, and the liquid outlet of the spray pump is connected to the spray pipe; A control cabinet is provided with a temperature detection system and a temperature setting system. The temperature detection system is connected to the water tank and is used to measure the actual temperature of the quenching liquid in the water tank in real time. The temperature setting system is used to set the set temperature of the quenching liquid in the water tank. The control cabinet controls the connection of the water inlet control valve, the cooling pump and the spray pump. The water tank heat exchanger includes a first water tank heat exchanger and a second water tank heat exchanger, wherein the first water tank heat exchanger and the second water tank heat exchanger are arranged in parallel; A first water inlet control valve is installed on the cooling water inlet pipe of the first water tank heat exchanger, and a first cooling pump is installed on the quenching liquid inlet pipe of the first water tank heat exchanger; a second water inlet control valve is installed on the cooling water inlet pipe of the second water tank heat exchanger, and a second cooling pump is installed on the quenching liquid inlet pipe of the second water tank heat exchanger; The quenching liquid inlet pipes of the first water tank heat exchanger and the second water tank heat exchanger are respectively installed with liquid inlet temperature measuring rods; The quenching liquid outlet pipes of the first water tank heat exchanger and the second water tank heat exchanger are respectively installed with liquid outlet temperature measuring rods.

2. The automatic control device for the residual heat quenching water tank according to claim 1, characterized in that: The control cabinet is provided with a temperature display screen.

3. The control method of the automatic control device for the waste heat quenching water tank according to claim 1 is characterized in that: The steps include: S1. Set the temperature of the quenching liquid in the water tank according to the process requirements; S2. During normal production, if the actual temperature of the quenching liquid in the water tank is equal to or lower than the set temperature, the first cooling pump, the first water tank heat exchanger, the second cooling pump, and the second water tank heat exchanger all stop working, the first water inlet control valve and the second water inlet control valve are closed, and the spray pump operates normally. The quenching liquid in the water tank is output to the spray pipe through the spray pump and sprayed out through the spray pipe; If there is no production during the shift, the first cooling pump, the first water tank heat exchanger, the second cooling pump and the second water tank heat exchanger will not work. At this time, the spray pump controls the flow rate to achieve low-power operation, thereby reducing energy consumption; S3. When the actual temperature of the quenching liquid in the water tank is higher than the set temperature, the control cabinet controls the first cooling pump to start, the first water inlet control valve to open, and the first water tank heat exchanger to work synchronously. The quenching liquid in the water tank flows from the quenching liquid inlet into the first water tank heat exchanger through the first cooling pump. At the same time, the circulating cooling water from the water inlet manifold of the circulation system flows from the cooling water inlet into the first water tank heat exchanger through the first water inlet control valve. After the circulating cooling water exchanges heat with the quenching liquid, the circulating cooling water flows back to the circulation system return water manifold from the cooling water outlet, and the cooled quenching liquid flows back to the water tank from the quenching liquid outlet. The first cooling pump controls the flow rate to reduce the temperature of the quenching liquid, and the cycle continues until the actual temperature of the quenching liquid in the water tank is consistent with the set temperature. S4. If the actual temperature of the quenching liquid in the water tank is still higher than the set temperature after the circulation, that is, the first cooling pump still cannot meet the cooling requirement when running at full power, the control cabinet controls the second cooling pump to start, the second water inlet control valve to open, and the second water tank heat exchanger to work synchronously. At this time, the first cooling pump and the second cooling pump jointly achieve the degree of cooling of the quenching liquid by controlling the flow rate. The cycle is repeated until the actual temperature of the quenching liquid in the water tank is consistent with the set temperature.

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