Cooling system for automobile welding production line

Abstract

The invention relates to a cooling system for an automobile welding production line, which is applied to the field of cooling systems and comprises an equipment end and a system end, the equipment end comprises a multi-stage centrifugal pump and a heat exchanger, and a compensation cooling group is arranged between the multi-stage centrifugal pump and the heat exchanger; the compensation cooling set comprises a refrigeration cooling device connected with the multi-stage centrifugal pump, a compensation tank set is connected between the refrigeration cooling device and the input end of the heat exchanger, the input end of the refrigeration cooling device is connected with a liquid storage tank set, and a rapid water supply valve is connected between the input end of the liquid storage tank set and the input end of the heat exchanger. The system end comprises a monitoring module, a data processing module, a data storage module and a control module; the control module is used for adjusting specified equipment to work according to the equipment adjusting scheme sent by the data processing module; a dynamic compensation mode and a trigger adjustment mode are set in the control module; and the cooling liquid output requirement can be quickly met when the thermal load is increased suddenly.

Description

Technical Field

[0001] The invention relates to a cooling system for automobile welding, and in particular to a cooling system for an automobile welding production line applied in the field of cooling systems. Background Art

[0002] Existing automobile welding production lines usually use multiple welding robots for high-intensity continuous operations. These welding processes generate a lot of heat, especially for core components such as welding guns, power supplies and servo motors, which may experience a sharp rise in temperature. The cooling water system circulates coolant to quickly remove heat, ensuring that all robot components operate within a safe temperature range and avoiding shutdowns or failures caused by overheating.

[0003] As the power and frequency of welding processes (such as spot welding, laser welding, and arc welding) continue to increase, the heat load of welding robots and their key components has increased significantly. Traditional cooling methods can no longer meet the demand. Regional closed-loop circulation system water cooling technology has become the mainstream solution due to its high efficiency and controllability.

[0004] The Chinese invention patent CN111215792B specification discloses a welding device with a cooling system, including a welding driven roller unit, and a circular water return ring body arranged between the lower left driven pressure roller and the plug body, the outer cylindrical surface of the water return ring body is provided with a concave annular groove; the interior of the water return ring body is provided with an annular water return cavity; the water return ring body and the lower right driven pressure roller are surrounded to form a right cooling water cavity. Compared with the related art, the invention can realize the fixation of the welding point, the rolling of the pressure roller drives the continuous feeding of the plate, thereby realizing the continuous welding of the plate, and the cooling system is arranged inside it, which can take away the welding heat in time and ensure continuous and stable welding.

[0005] The Chinese invention patent CN116060727B specification discloses a multi-directional welding circuit board cooling system, which belongs to the field of circuit board production and manufacturing technology. The invention includes a conveyor belt, a multi-directional welding unit, a base and a placement box. The multi-directional welding unit is arranged on the right side of the conveyor belt, and the base is arranged on the left side of the conveyor belt. The left side of the upper end face of the conveyor belt is fixedly connected with a placement box, and the inner cavity of the placement box is placed with a circuit board. The right side of the upper end face of the base is fixedly connected with a slide cylinder; the invention quickly transports the circuit board to the lower part of the cooling mechanism through the conveyor belt after the circuit board is welded in the multi-directional welding unit, and cooperates with the spray mechanism to achieve the function of quickly cooling the entire circuit board and removing excess welding impurities on the surface of the circuit board.

[0006] The existing welding cooling system is not easy to adjust the heat exchanger to meet the surge in coolant output when the coolant temperature fluctuates frequently. The cooling and output adjustment of the circulating coolant is inconvenient. The existing welding cooling system is not easy to cope with the surge in heat load during welding. Summary of the invention

[0007] In view of the above-mentioned prior art, the technical problem to be solved by the present invention is that the existing welding cooling system is not easy to adjust the operation of the heat exchanger to adapt to the surge in coolant output when the coolant temperature fluctuates frequently, and the cooling and output adjustment of the circulating coolant are inconvenient. The existing welding cooling system is not easy to cope with the situation of a surge in heat load during welding.

[0008] In order to solve the above problems, the present invention provides a cooling system for an automobile welding production line, comprising an equipment end and a system end, wherein the equipment end comprises a multi-stage centrifugal pump and a heat exchanger, and a compensating cooling group is arranged between the multi-stage centrifugal pump and the heat exchanger; The compensating cooling group includes a refrigeration and cooling device connected to a multi-stage centrifugal pump, a compensating tank group is connected between the refrigeration and cooling device and the input end of the heat exchanger, a liquid storage tank group is connected to the input end of the refrigeration and cooling device, and a quick water supply valve is connected between the input end of the liquid storage tank group and the input end of the heat exchanger; The system end includes a monitoring module, a data processing module, a data storage module and a control module; The monitoring module is used to collect monitoring data, including the flow rate and temperature of cooling water and the temperature of welding equipment; The data processing module is used to analyze and process monitoring data, analyze the required output flow of coolant to meet the cooling requirements of welding equipment, and formulate equipment adjustment plans; The data storage module is used to store monitoring data and work logs; The control module is used to adjust the operation of the designated equipment according to the equipment adjustment plan issued by the data processing module; the control module is provided with a dynamic compensation mode and a trigger adjustment mode; The dynamic compensation mode is used to control the compensation cooling group to work continuously to compensate the cooling water output flow; the trigger adjustment mode is used to perform quantitative flow compensation on the cooling water output.

[0009] In the cooling system of the automobile welding production line, it is convenient to quickly adapt to the demand for coolant output when the heat load surges.

[0010] As a further improvement of the present application, when the dynamic compensation mode is working, the heat exchanger and the compensation tank group are set to work synchronously according to the set parameters, and the total coolant flow rate output by the heat exchanger and the compensation tank group is greater than or equal to the required cooling water flow rate; the dynamic compensation mode is triggered when the average temperature of the reflux coolant within the set time is greater than the first set threshold and the required output flow rate of the coolant is greater than the set value.

[0011] As a further improvement of the present application, when the trigger compensation mode is working, the output of the heat exchanger is switched so that the coolant output by the heat exchanger is output to a tank in the compensation tank group. At this time, the coolant output by the refrigeration and cooling device is input to the tank of the compensation tank group to output the coolant. At this time, the compensation tank group is turned on to output a set amount of coolant; The trigger compensation mode is triggered when the average temperature of the return coolant within the set time period is greater than the set second set threshold and the required output flow of the coolant is greater than the set value.

[0012] As a further improvement of the present application, after the trigger compensation mode is in operation, the trigger threshold is adjusted according to the coolant storage amount in the compensation tank group and the rate at which the heat exchanger outputs the set temperature coolant.

[0013] As another improvement of the present application, when the triggered compensation mode is working, when the liquid storage amount in the compensation tank group cannot meet the total output amount of coolant required within the set time period, the control module sets the dynamic compensation mode to turn on.

[0014] As another improved supplement of the present application, a first hydraulic sensor is installed at both the input end and the output end of the multi-stage centrifugal pump, and an automatic exhaust valve is installed at the input end of the heat exchanger.

[0015] As another improved supplement of the present application, a dynamic pressure difference balancing valve is installed at the cooling water input end of the heat exchanger, and the dynamic pressure difference balancing valve is used to stabilize the pressure difference, optimize the flow distribution and reduce energy consumption.

[0016] As another improvement of the present application, a temperature sensor, a second hydraulic sensor and a flow sensor are connected to the monitoring module, and the temperature sensor, the second hydraulic sensor and the flow sensor are all installed before the input end of the heat exchanger; the first hydraulic sensor is signal-connected to the monitoring module.

[0017] As another improvement of the present application, a three-way valve is installed at the coolant output end of the heat exchanger, one output end of the three-way valve is connected to the input end of the refrigeration cooling device, the other output end of the three-way valve is connected to the multi-stage centrifugal pump, and a diaphragm valve is installed before the cooling water input end of the heat exchanger.

[0018] As another improvement of the present application, when the temperature of the coolant input to the heat exchanger is greater than the maximum set value, the coolant is discharged into the liquid storage tank group through the drain valve. The liquid storage tank in the liquid storage tank group is stabilized and cooled to the set temperature and is selected as the coolant input source for the refrigeration and cooling device.

[0019] In summary, the present invention achieves dual cooling protection through the compensating cooling group. In the dynamic compensation mode, the total coolant flow rate that can be output by the heat exchanger and the compensation tank group is always greater than the required flow rate, and the trigger compensation mode realizes the coordinated work of the refrigeration cooling device and the compensation tank group by switching the pipeline, which is convenient for adapting to sudden high heat loads. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a front schematic diagram of the compensating cooling group of the first embodiment of the present application; Figure 2 This is a front perspective schematic diagram of the compensating cooling group of the first embodiment of the present application; Figure 3 This is a three-dimensional schematic diagram of the back side of the compensation cooling group of the first embodiment of the present application; Figure 4 This is a structural block diagram of a compensating cooling group according to the first embodiment of the present application; Figure 5 This is a system block diagram of the first and second implementation modes of this application; Figure 6 A coolant path diagram when the trigger compensation mode of the first and second embodiments of the present application is working; Figure 7 The coolant path diagram when the dynamic compensation mode of the first and second embodiments of the present application is working; Figure 8 This is a schematic diagram of the front structure of the cooling system of the first and second embodiments of the present application.

[0021] Description of the numbers in the figure: 1. Multistage centrifugal pump; 2. Heat exchanger; 3. Refrigeration and cooling device; 4. Compensation tank group; 5. Liquid storage tank group. DETAILED DESCRIPTION

[0022] The following describes two implementation modes of the present application in detail with reference to the accompanying drawings.

[0023] The first implementation method: Figure 1-8 It is shown that a cooling system for an automobile welding production line includes an equipment end and a system end. The equipment end includes a multistage centrifugal pump 1 and a heat exchanger 2. The multistage centrifugal pump is used to drive the circulation of the coolant. The heat exchanger 2 cools the circulating coolant through external cooling water. An expansion tank is connected to the pipeline directly between the multistage centrifugal pump 1 and the heat exchanger 2. The expansion tank is used to absorb thermal expansion and contraction to prevent damage to the pipeline and components. The input end and the output end of the multistage centrifugal pump 1 are both equipped with a first hydraulic sensor, which is used to detect the hydraulic pressure of the input end and the output end of the multistage centrifugal pump 1. The input end of the heat exchanger 2 is equipped with an automatic exhaust valve, which is used to detect and exhaust air in the pipeline system. A PLC control system is set by a technician in this field to monitor the temperature, flow rate and pressure of the system coolant, and data is monitored through a temperature sensor, a flow meter and a first hydraulic sensor. The PLC control system controls the speed of the multi-stage centrifugal pump 1 through a frequency converter to change the system state in real time, thereby achieving stability and reliability of cooling accuracy; if the temperature sensor feeds back that the temperature of the welding equipment rises, the frequency converter controls the motor speed to increase the flow rate, thereby achieving stability in heat dissipation, and restores the original setting after the abnormality is eliminated; The PLC control system uses existing technology, and the technicians in this field select a suitable PLC control system for setting; The multistage centrifugal pump 1 is provided with pressure monitoring at the inlet and outlet. When the inlet pressure is continuously lower than the saturated vapor pressure of the liquid, air may be sucked in. Abnormal pressure fluctuations (such as high-frequency oscillation) indicate the presence of bubbles. At this time, the air in the pipeline system is discharged through the automatic exhaust valve. A compensating cooling group is provided between the multistage centrifugal pump 1 and the heat exchanger 2; the compensating cooling group is used to supplement the input coolant; The compensating cooling group includes a refrigeration and cooling device 3 connected to the multi-stage centrifugal pump 1. A suitable refrigeration and cooling device 3 is selected and installed by a person skilled in the art, such as a compressor refrigeration device. The coolant is cooled to a set temperature by the refrigeration and cooling device 3 and then output. The refrigeration and cooling device 3 is used to quickly cool the high-temperature coolant. A dynamic pressure differential balancing valve is installed at the cooling water input end of the heat exchanger 2. The dynamic pressure differential balancing valve is used to stabilize the pressure difference, optimize the flow distribution and reduce energy consumption, and is easy to improve the stability and comfort of the system operation. A person skilled in the art can select a suitable dynamic pressure differential balancing valve in the prior art for installation; A three-way valve is installed at the coolant output end of the heat exchanger 2, one output end of the three-way valve is connected to the input end of the refrigeration and cooling device 3, and the other output end of the three-way valve is connected to the multi-stage centrifugal pump 1. A diaphragm valve is installed before the cooling water input end of the heat exchanger 2, and the diaphragm valve is used for system water replenishment and sealing and blocking; the diaphragm valve is a prior art, and a technician in this field selects a suitable diaphragm valve for installation; A compensation tank group 4 is connected between the refrigeration and cooling device 3 and the input end of the heat exchanger 2, a liquid storage tank group 5 is connected to the input end of the refrigeration and cooling device 3, and a quick water supply valve is connected between the input end of the liquid storage tank group 5 and the input end of the heat exchanger 2; the refrigeration and cooling device 3 quickly cools the high-temperature coolant stored in the liquid storage tank group 5 and outputs it to the compensation tank group 4 for standby use; When the temperature of the coolant input to the heat exchanger 2 is greater than the maximum set value, the coolant is discharged into the liquid storage tank group 5 for storage through the drain valve. The liquid storage tank in the liquid storage tank group 5 whose temperature is stable and cooled to the set temperature is selected as the coolant input source of the refrigeration cooling device 3.

[0024] Recycling mechanism of liquid storage tank group 5: When the temperature of the coolant at the heat exchanger inlet exceeds the standard, the high-temperature coolant is temporarily stored in the liquid storage tank group and used as a backup cold source for the refrigeration and cooling device after cooling down. This "high-temperature temporary storage-cooling reuse" mechanism is easier to improve the utilization rate of coolant than the traditional direct discharge method.

[0025] The compensation tank group 4 includes at least two insulation tanks; the liquid storage tank group 5 includes at least two liquid storage tanks, temperature sensors are installed in the liquid storage tanks, and heat exchange fins are installed on the liquid storage tanks. The liquid storage tank group 5 is used to store high-temperature coolant; The system end includes a monitoring module, a data processing module, a data storage module and a control module; The monitoring module is used to collect monitoring data, including the flow rate, temperature and welding equipment temperature of cooling water; the monitoring module is connected with a temperature sensor, a second hydraulic sensor and a flow sensor, and the temperature sensor, the second hydraulic sensor and the flow sensor are all installed before the input end of the heat exchanger 2; the first hydraulic sensor is connected to the monitoring module signal; The data processing module is used to analyze and process monitoring data, analyze the required output flow of coolant to meet the cooling requirements of welding equipment, and formulate equipment adjustment plans; The data storage module is used to store monitoring data and work logs; The control module is used to adjust the operation of the designated equipment according to the equipment adjustment plan issued by the data processing module; the control module is provided with a dynamic compensation mode and a trigger adjustment mode; The dynamic compensation mode is used to control the compensation cooling group to work continuously to compensate the cooling water output flow; the trigger adjustment mode is used to call the compensation cooling group to output a certain amount of coolant to compensate for the flow; In the normal working mode of this scheme, the coolant circulates in the closed pipeline through the multistage centrifugal pump 1, and the refluxed high-temperature coolant dissipates heat through the heat exchanger 2. The heat exchanger 2 cools the circulating coolant through the external cooling water, and the cooled coolant is then output to the welding equipment through the multistage centrifugal pump 1 to cool it. The compensation cooling group and compensation mode settings of this solution realize intelligent adjustment of cooling water, ensuring that the welding equipment can obtain stable and appropriate cooling effect during continuous operation; the compensation cooling group flexibly adjusts the output flow of cooling water according to the instructions of the dynamic compensation mode and the trigger adjustment mode, effectively dealing with the problem of equipment overheating caused by heat accumulation during the welding process; it not only improves the operating efficiency of the welding equipment, but also reduces the failure rate caused by overheating.

[0026] Second implementation method: Figure 5-8It is shown that when the dynamic compensation mode is working, the heat exchanger 2 and the refrigeration and cooling device 3 are set to work synchronously according to the set parameters, so that the high-temperature coolant is quickly cooled by the refrigeration and cooling device 3, and the coolant with a lower temperature is output after dissipating the heat through the heat exchanger 2, which is convenient for the comprehensive treatment of the coolant with temperature fluctuations, and the total flow rate of the coolant output by the heat exchanger 2 and the refrigeration and cooling device 3 is greater than or equal to the required cooling water flow rate; the dynamic compensation mode is triggered when the average temperature of the reflux coolant within the set time is greater than the first set threshold, and the required output flow rate of the coolant is greater than the set value (the output coolant temperature is less than or equal to 30 degrees Celsius); the first set threshold and set time are set by those skilled in the art, for example: the dynamic compensation mode is triggered when the average temperature of the reflux coolant within 1 minute is greater than 50°C and the required output flow rate of the coolant is greater than 250L / min; When the trigger compensation mode is working, the output of the heat exchanger 2 is switched so that the coolant output by the heat exchanger 2 is output to a tank in the compensation tank group. At this time, the coolant output by the refrigeration and cooling device 3 is input to the tank of the compensation tank group 4 to output the coolant. At this time, the compensation tank group 4 is turned on to output a set amount of coolant; The trigger compensation mode is triggered when the average temperature of the reflux coolant within the set time period is greater than the set second set threshold and the required output flow of the coolant is greater than the set value; a suitable second set threshold is set by a technician in this field, for example: when the average temperature of the reflux coolant within 1 minute is >40°C and the required output flow of the coolant is >250L / min, the trigger compensation mode is triggered.

[0027] Furthermore, after the trigger compensation mode is working, the trigger threshold is adjusted according to the coolant storage capacity in the compensation tank group 4 and the rate at which the heat exchanger 2 outputs the set temperature coolant; for example, the minimum storage capacity threshold of the compensation tank group 4 is set to 200L, then when it is detected that the storage capacity is lower than 200L, the system will adjust the trigger threshold from the average temperature of the reflux coolant >40°C and the required output flow rate of the coolant >250L / min to the average temperature of the reflux coolant >45°C and the required output flow rate of the coolant >150L / min.

[0028] On the contrary, if the coolant storage volume in the compensation tank group 4 is higher than the set maximum threshold, the trigger compensation mode will increase the trigger threshold to increase the coolant output rate, thereby making more efficient use of the stored coolant. For example, if the maximum storage volume threshold of the compensation tank group 4 is set to 80% of the full capacity, that is, 800L, then when the storage volume is detected to be higher than 800L, the system will adjust the trigger threshold to the average temperature of the return coolant>35℃ and the required output flow rate of the coolant>200L / min.

[0029] In this way, the triggered compensation mode ensures dynamic response and efficient operation of the cooling system while avoiding waste of coolant and potential system failure.

[0030] When the required output flow of the coolant is less than the output flow of the heat exchanger 2, the trigger compensation mode is turned off and the system returns to normal working state; When the trigger compensation mode is working, when the liquid storage volume in the compensation tank group 4 cannot meet the total output volume of the coolant required within the set time period, the control module sets the dynamic compensation mode to start; This solution realizes the intelligent distribution and efficient use of cooling water. In the dynamic compensation mode, the heat exchanger 2 and the compensation tank group 4 work together to ensure that the output flow of the coolant is always higher than the actual demand, effectively preventing the equipment from overheating due to insufficient flow. When the coolant temperature rises abnormally or the demand flow surges, the trigger compensation mode responds quickly, switching the output of the heat exchanger 2 and activating the backup coolant of the compensation tank group 4, realizing instant flow replenishment and ensuring the continuity and stability of the welding process.

[0031] In addition, this solution is highly intelligent and adaptive. The trigger compensation mode can flexibly adjust the trigger threshold according to the storage volume of the coolant in the compensation tank group 4 and the output rate of the heat exchanger 2 to meet the cooling demand with the optimal strategy. When the trigger compensation mode cannot meet the supply demand, the system automatically switches to the dynamic compensation mode, further enhancing the stability and reliability of the cooling system.

[0032] This solution also designs a coolant recycling mechanism. When the coolant temperature input by the heat exchanger 2 exceeds the maximum set value, the system discharges this section of coolant into the liquid storage tank group 5 for storage through the drain valve. After the coolant temperature in the liquid storage tank group 5 stabilizes and drops to the set temperature, it can be used as a coolant input source option for the refrigeration and cooling device, thereby realizing the recycling of the coolant, effectively improving resource utilization and reducing operating costs.

[0033] In summary, the present invention achieves dual cooling protection through the compensating cooling group. In the dynamic compensation mode, the total coolant flow rate that can be output by the heat exchanger 2 and the compensation tank group 4 is always greater than the required flow rate, and the trigger compensation mode realizes the coordinated work of the refrigeration cooling device 3 and the compensation tank group 4 by switching the pipeline, which is convenient for adapting to sudden high heat loads.

[0034] In view of current practical needs, the above-mentioned implementation mode adopted in this application is not limited to the scope of protection. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the scope of protection of the present invention.

Claims

1. A cooling system for an automobile welding production line, comprising an equipment end and a system end, wherein the equipment end comprises a multi-stage centrifugal pump (1) and a heat exchanger (2), characterized in that: A compensating cooling group is provided between the multi-stage centrifugal pump (1) and the heat exchanger (2); The compensating cooling group comprises a refrigeration and cooling device (3) connected to the multi-stage centrifugal pump (1), a compensating tank group (4) connected between the refrigeration and cooling device (3) and the input end of the heat exchanger (2), a liquid storage tank group (5) connected to the input end of the refrigeration and cooling device (3), and a quick water supply valve connected between the input end of the liquid storage tank group (5) and the input end of the heat exchanger (2); The system end includes a monitoring module, a data processing module, a data storage module and a control module; The monitoring module is used to collect monitoring data, and the monitoring data includes the flow rate and temperature of cooling water and the temperature of welding equipment; The data processing module is used to analyze and process monitoring data, analyze the required output flow of coolant to meet the cooling requirements of welding equipment, and formulate equipment adjustment plans; The data storage module is used to store monitoring data and work logs; The control module is used to adjust the operation of the designated equipment according to the equipment adjustment plan issued by the data processing module; the control module is provided with a dynamic compensation mode and a trigger adjustment mode; The dynamic compensation mode is used to control the compensation cooling group to work continuously to perform flow compensation on the cooling water output; the trigger adjustment mode is used to perform quantitative flow compensation on the cooling water output.

2. The cooling system for an automobile welding production line according to claim 1, characterized in that: When the dynamic compensation mode is in operation, the heat exchanger (2) and the compensation tank group (4) are set to operate synchronously according to set parameters, and the total flow rate of the coolant output by the heat exchanger (2) and the compensation tank group (4) is greater than or equal to the required flow rate of the cooling water; the dynamic compensation mode is triggered when the average temperature of the return coolant within a set time exceeds a first set threshold value, and the required output flow rate of the coolant is greater than a set value.

3. The cooling system for an automobile welding production line according to claim 1 is characterized in that: When the trigger compensation mode is in operation, the output of the heat exchanger (2) is switched so that the coolant output by the heat exchanger (2) is delivered to a tank in the compensation tank group. At this time, the coolant output by the refrigeration and cooling device (3) is delivered to the tank of the compensation tank group (4) from which the coolant is to be delivered. At this time, the compensation tank group (4) is opened to deliver a set amount of coolant. The trigger compensation mode is triggered when the average temperature of the return coolant within a set time period is greater than a set second set threshold and the required output flow of the coolant is greater than a set value.

4. The cooling system for an automobile welding production line according to claim 3 is characterized in that: After the trigger compensation mode is in operation, the trigger threshold is adjusted according to the amount of coolant stored in the compensation tank group (4) and the rate at which the heat exchanger (2) outputs coolant at a set temperature.

5. The cooling system for an automobile welding production line according to claim 4 is characterized in that: When the trigger compensation mode is in operation, if the amount of liquid stored in the compensation tank group (4) cannot meet the total amount of coolant output required within a set time period, the control module sets the dynamic compensation mode to start.

6. The cooling system for an automobile welding production line according to claim 1, characterized in that: The input end and the output end of the multi-stage centrifugal pump are both installed with a first hydraulic pressure sensor, and the input end of the heat exchanger (2) is installed with an automatic exhaust valve.

7. The cooling system for an automobile welding production line according to claim 1, characterized in that: A dynamic pressure difference balancing valve is installed at the cooling water input end of the heat exchanger (2), and the dynamic pressure difference balancing valve is used to stabilize the pressure difference, optimize flow distribution and reduce energy consumption.

8. The cooling system for an automobile welding production line according to claim 6, characterized in that: The monitoring module is connected to a temperature sensor, a second hydraulic sensor and a flow sensor, and the temperature sensor, the second hydraulic sensor and the flow sensor are all installed before the input end of the heat exchanger (2); the first hydraulic sensor is signal-connected to the monitoring module.

9. The cooling system for an automobile welding production line according to claim 1, characterized in that: A three-way valve is installed at the coolant output end of the heat exchanger (2), one output end of the three-way valve is connected to the input end of the refrigeration cooling device (3), the other output end of the three-way valve is connected to the multi-stage centrifugal pump (1), and a diaphragm valve is installed before the cooling water input end of the heat exchanger (2).

10. The cooling system for an automobile welding production line according to claim 1, characterized in that: When the temperature of the coolant input to the heat exchanger (2) is greater than the maximum set value, the coolant is discharged into the liquid storage tank group (5) for storage through the drain valve. The liquid storage tank in the liquid storage tank group (5) whose temperature is stable and cooled to the set temperature is selected as the coolant input source of the refrigeration and cooling device (3).

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