A machine tool oil cooling system and control method thereof

Abstract

The present invention provides a machine tool oil cooling system, comprising a machine tool, a refrigeration device, a cooling device, a first condenser, a hydraulic valve component and a DC fan assembly, wherein one end of the machine tool is connected to the refrigeration device, and the other end is connected to the cooling device, the refrigeration device is connected to the cooling device, one end of the hydraulic valve component is connected to the refrigeration device, and the other end is connected to the first condenser, the first condenser is connected to the refrigeration device, and the DC fan assembly is fixed to one side of the first condenser. The machine tool oil cooling system can not only effectively improve the temperature control accuracy of the cooling oil and provide the processing accuracy of the machine tool equipment, but also improve the reliability of the cooling equipment and extend the service life of the machine tool.

Description

Technical Field

[0001] The invention relates to the technical field of cooling control, and in particular to a machine tool oil cooling system and a control method thereof. Background Art

[0002] In modern manufacturing, machine tools are indispensable equipment, such as CNC (Computer Numerical Control), grinders, wire cutting machines, etc. When the machine tool is operating, the tool cutting the workpiece and the high-speed operation of the spindle will generate a lot of heat, causing thermal deformation of the machine tool's guide rails and spindle, thereby reducing the machining accuracy of the workpiece and the life of the tool and spindle. Therefore, there is a need to cool the machine tool. The function of a machine tool cooler such as an oil cooler (also called an oil cooler) is to effectively reduce the heat generated by machine tool cutting.

[0003] However, the temperature control accuracy of the existing machine tool oil cooling system is not high, because too much cooling oil bypass will lead to insufficient heat exchange of the refrigerant in the evaporator, causing the compressor to inhale liquid, which will affect the reliable operation of the machine tool and reduce the service life of the machine tool. Summary of the invention

[0004] In view of this, the purpose of the present invention is to avoid the shortcomings of the prior art and provide a machine tool oil cooling system, which can not only effectively improve the temperature control accuracy of the cooling oil and provide the processing accuracy of the machine tool equipment, but also improve the reliability of the cooling equipment and extend the service life of the machine tool.

[0005] An embodiment of the present invention provides a machine tool oil cooling system, including a machine tool, a refrigeration device, a cooling device, a first condenser, a hydraulic valve component and a DC fan assembly, one end of the machine tool is connected to the refrigeration device, and the other end is connected to the cooling device, the refrigeration device is connected to the cooling device, one end of the hydraulic valve component is connected to the refrigeration device, and the other end is connected to the first condenser, the first condenser is connected to the refrigeration device, and the DC fan assembly is fixed to one side of the first condenser.

[0006] Furthermore, the refrigeration device includes a compressor, an evaporator assembly and a throttling component, one end of the evaporator assembly is connected to the compressor, and the other end is connected to the throttling component.

[0007] Further, the hydraulic valve component is a four-way valve;

[0008] The evaporator assembly includes a first evaporator and a second evaporator, one end of the first evaporator is connected to the compressor, and the other end is connected to the A port of the four-way valve, one end of the second evaporator is connected to the throttling component, and the other end is connected to the B port of the four-way valve, the throttling component is connected to the D port of the four-way valve, and one end of the first condenser is connected to the compressor, and the other end is connected to the C port of the four-way valve.

[0009] Furthermore, the cooling device includes an oil tank, an oil pump, and an oil temperature sensing component. The input end of the oil tank is connected to the machine tool, and the output end of the oil tank is connected to the oil pump. A connecting pipe is provided between the first evaporator and the second evaporator. The oil pump is connected to the first evaporator, and the second evaporator is connected to the input end of the machine tool. The oil temperature sensing component is connected between the oil pump and the machine tool.

[0010] Furthermore, the oil temperature sensing component includes an inlet oil temperature sensing package and an outlet oil temperature sensing package, the inlet oil temperature sensing package is connected between the second evaporator and the input end of the machine tool, and the outlet oil temperature sensing package is connected between the input end of the oil tank and the output end of the machine tool.

[0011] Further, the hydraulic valve component is a three-way valve;

[0012] The evaporator assembly includes a second condenser and a third evaporator, one end of the third evaporator is connected to the throttling component, and the other end is connected to the compressor, one end of the second condenser is connected to the E port of the three-way valve, and the other end is connected to the throttling component, the first condenser is connected to the G port of the three-way valve, and a limiting flow tube is also arranged between the second condenser and the three-way valve, one end of the limiting flow tube is connected to the F port of the three-way valve, and the other end is connected to the connection between the second condenser and the throttling component.

[0013] Furthermore, the cooling device includes an oil tank, an oil pump, and an oil temperature sensing component. The input end of the oil tank is connected to the machine tool, and the output end of the oil tank is connected to the oil pump. A connecting pipe is provided between the third evaporator and the second condenser. The oil pump is connected to the third evaporator, and the second condenser is connected to the input end of the machine tool. The oil temperature sensing component is connected between the oil pump and the machine tool.

[0014] Furthermore, the oil temperature sensing component includes an inlet oil temperature sensing package and an outlet oil temperature sensing package, the inlet oil temperature sensing package is connected between the second condenser and the input end of the machine tool, and the outlet oil temperature sensing package is connected to the input end of the oil tank and the output end of the machine tool.

[0015] This embodiment also provides a control method for a machine tool oil cooling system, which detects the heat load generated by the machine tool equipment during processing, and then sends corresponding control instructions to adjust the operating state of the machine tool oil cooling system according to the heat load generated by the machine tool equipment during processing.

[0016] Furthermore, according to the size of the heat load generated by the machine tool processing, corresponding control instructions are sent to adjust the operating state of the machine tool oil cooling system. Specifically, when the heat load generated by the machine tool processing equipment is large, the DC fan assembly runs at the highest speed, and at the same time, the flow route of the coolant in the refrigeration device is changed through the hydraulic valve component.

[0017] Furthermore, according to the size of the heat load generated by the machine tool processing, corresponding control instructions are sent to adjust the operating state of the machine tool oil cooling system. Specifically, when the heat load generated by the machine tool processing equipment is large, the DC fan assembly operates at the lowest speed, and at the same time, the flow route of the coolant in the refrigeration device is changed through the hydraulic valve component.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: due to the provision of a hydraulic valve component and a DC fan assembly, the heat exchange amount of the cooling oil inside each refrigeration device is changed through the reversal of the hydraulic valve component and the speed adjustment of the DC fan assembly during the operation of the machine tool, and the temperature of the cooling oil is precisely controlled at 0~100% load in a timely and effective manner, which can not only effectively improve the temperature control accuracy of the cooling oil and provide the processing accuracy of the machine tool equipment, but also improve the reliability of the cooling equipment and extend the service life of the machine tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0020] Figure 1 This is a diagram of the operating status of the machine tool oil cooling system under heavy load in the first embodiment.

[0021] Figure 2 This is an operating status diagram of the machine tool oil cooling system at low load in Example 1.

[0022] Figure 3 This is a diagram of the operating state of the machine tool oil cooling system under heavy load in the second embodiment.

[0023] Figure 4 This is an operating state diagram of the machine tool oil cooling system at low load in Example 2.

[0024] The figure includes: a machine tool 1, a refrigeration device 2, a compressor 21, an evaporator assembly 22, a first evaporator 221, a second evaporator 222, a third evaporator 223, a second condenser 224, a throttling component 23, a current limiting tube 24, a cooling device 3, an oil tank 31, an oil pump 32, an oil temperature sensing component 33, an outlet oil temperature sensing package 331, an inlet oil temperature sensing package 332, a connecting pipe 34, a first condenser 4, a hydraulic valve component 5, and a DC fan component 6. DETAILED DESCRIPTION

[0025] The present invention is further described in conjunction with the following examples.

[0026] Embodiment 1:

[0027] like Figure 1-2 As shown, the embodiment of the present invention provides a machine tool oil cooling system, including a machine tool 1, a refrigeration device 2, a cooling device 3, a first condenser 4, a hydraulic valve component 5 and a DC fan assembly 6. One end of the machine tool 1 is connected to the refrigeration device 2, and the other end is connected to the cooling device 3. The refrigeration device 2 is connected to the cooling device 3. One end of the hydraulic valve component 5 is connected to the refrigeration device 2, and the other end is connected to the first condenser 4. The first condenser 4 is connected to the refrigeration device 2. The DC fan assembly 6 is fixed to one side of the first condenser 4, so that the machine tool changes the heat exchange amount of the cooling oil in the refrigeration device 2 through the reversal of the hydraulic valve component 5 and the speed adjustment of the DC fan assembly 6 during the operation, and the cooling oil is timely and effectively controlled with a precise temperature of 0-100% load, which can not only effectively improve the temperature control accuracy of the cooling oil and provide the processing accuracy of the machine tool equipment, but also improve the reliability of the cooling equipment and extend the service life of the machine tool. .

[0028] In a preferred embodiment, the refrigeration device 2 includes a compressor 21 , an evaporator assembly 22 and a throttling component 23 . One end of the evaporator assembly 22 is connected to the compressor 21 , and the other end is connected to the throttling component 23 .

[0029] In a preferred embodiment, the hydraulic valve component 5 is a four-way valve. Furthermore, the evaporator assembly 22 includes a first evaporator 221 and a second evaporator 222. One end of the first evaporator 221 is connected to the compressor 21, and the other end is connected to the A port of the four-way valve. One end of the second evaporator 222 is connected to the throttling component 23, and the other end is connected to the B port of the four-way valve. The throttling component 23 is connected to the D port of the four-way valve. One end of the first condenser 4 is connected to the compressor 21, and the other end is connected to the C port of the four-way valve.

[0030] In a preferred embodiment, the cooling device 3 includes an oil tank 31, an oil pump 32, and an oil temperature sensing component 33. The input end of the oil tank 31 is connected to the machine tool 1, and the output end of the oil tank 31 is connected to the oil pump 32. A connecting pipe 34 is arranged between the first evaporator 221 and the second evaporator 222. The oil pump 32 is connected to the first evaporator 221, and the second evaporator 222 is connected to the input end of the machine tool 1. The oil temperature sensing component 33 is connected between the oil pump 32 and the machine tool 1.

[0031] In a preferred embodiment, the oil temperature sensing component 33 includes an inlet oil temperature sensing package 332 and an outlet oil temperature sensing package 331. The inlet oil temperature sensing package 332 is connected between the second evaporator 222 and the input end of the machine tool 1, and the outlet oil temperature sensing package 331 is connected to the input end of the oil tank 31 and the output end of the machine tool 1.

[0032] This embodiment also provides a control method for a machine tool oil cooling system, comprising the following steps:

[0033] Step 1: Detect the heat load generated by the machine tool equipment;

[0034] Step 2: When the heat load generated by the processing of the machine tool 1 equipment is large: the compressor 21 transports the high-temperature and high-pressure refrigerant to the first condenser 4 for heat exchange. At this time, the DC fan assembly 6 runs at the highest speed, and then the refrigerant passes through the four-way valve (hydraulic valve component 5) and flows through the throttling component 23 for throttling. After the throttling, the low-temperature and low-pressure refrigerant exchanges heat in the second evaporator 222, and then flows to the first evaporator 221 through the four-way valve to continue cooling the cooling oil. After the refrigerant exchanges heat in the first evaporator 221, it re-enters the compressor 21 for compression cycle. In this mode, the first evaporator 221 and the second evaporator 222 both cool the cooling oil.

[0035] At the same time, the oil pump 32 draws coolant from the oil tank 31 and first transports it to the first evaporator 221 for cooling, and then enters the second evaporator 222 for further cooling. Thereafter, the cooling oil will directly flow to the machine tool 1 processing equipment to absorb heat after passing through the outlet oil temperature sensing bag 331. The coolant coming out of the machine tool 1 processing equipment returns to the oil tank 31 after passing through the inlet oil temperature sensing bag 332 for detection.

[0036] Step 3: When the heat load generated by the machine tool equipment processing is small: the compressor 21 transports the high-temperature and high-pressure refrigerant to the first condenser 4 for preliminary heat exchange. At this time, the DC fan assembly 6 runs at a low speed, and then the refrigerant passes through the four-way valve (hydraulic valve component 5) and flows through the second evaporator 222 to continue heat exchange. At this time, the second evaporator 222 acts as a condenser to heat the cooling oil flowing through the second evaporator 222. The refrigerant is then throttled through the throttling component 23. The throttled low-temperature and low-pressure refrigerant enters the first evaporator 221 through the four-way valve. The refrigerant The cooling oil of 221 is cooled, and the refrigerant re-enters the compressor 21 for compression cycle after heat exchange in the first evaporator 221; in this mode, the first evaporator 221 cools the cooling oil, and the second evaporator 222 heats the cooling oil. The smaller the heat load of the machine tool 1 and the lower the speed of the DC fan assembly 6, the greater the heating amount of the cooling oil by the second evaporator 222, and the smaller the cooling capacity of the cooling equipment. When the heating amount of the second evaporator 222 is equivalent to the cooling capacity of the first evaporator 221, it can be ensured that the oil temperature of the cooling equipment is stable within the set value range under 0% condition (the machine tool 1 stops processing).

[0037] At the same time, the oil pump 32 draws coolant from the oil tank 31 and first transports it to the first evaporator 221 for cooling, and then enters the second evaporator 222 for heating. After that, the cooling oil will directly go to the machine tool 1 processing equipment to absorb processing heat after passing through the outlet oil temperature sensing bag 331. The coolant coming out of the machine tool 1 processing equipment returns to the oil tank 31 after passing through the inlet oil temperature sensing bag 332 for detection.

[0038] Embodiment 2:

[0039] like Figure 3-4 As shown, an embodiment of the present invention provides an oil cooling system for a machine tool 1, comprising a machine tool 1, a refrigeration device 2, a cooling device 3, a first condenser 4, a hydraulic valve component 5 and a DC fan assembly 6, wherein one end of the machine tool 1 is connected to the refrigeration device 2, and the other end is connected to the cooling device 3, the refrigeration device 2 is connected to the cooling device 3, one end of the hydraulic valve component 5 is connected to the refrigeration device 2, and the other end is connected to the first condenser 4, the first condenser 4 is connected to the refrigeration device 2, and the DC fan assembly 6 is fixed to one side of the first condenser 4, so that during the operation of the machine tool, the heat exchange amount of the cooling oil in the refrigeration device 2 is changed by reversing the hydraulic valve component 5 and adjusting the speed of the DC fan assembly 6, and the cooling oil is timely and effectively subjected to precise temperature control of 0-100% load, which can not only effectively improve the temperature control accuracy of the cooling oil and provide the processing accuracy of the machine tool equipment, but also improve the reliability of the cooling equipment and extend the service life of the machine tool.

[0040] In a preferred embodiment, the hydraulic valve component 5 is a three-way valve. Furthermore, the evaporator assembly 22 includes a second condenser 224 and a third evaporator 223. One end of the third evaporator 223 is connected to the throttling component 23, and the other end is connected to the compressor 21. One end of the second condenser 224 is connected to the E port of the three-way valve, and the other end is connected to the throttling component 23. The first condenser 4 is connected to the G port of the three-way valve. A limiting flow tube 24 is also arranged between the second condenser 224 and the three-way valve. One end of the limiting flow tube 24 is connected to the F port of the three-way valve, and the other end is connected to the connection between the second condenser 224 and the throttling component 23.

[0041] In a preferred embodiment, the cooling device 3 includes an oil tank 31, an oil pump 32, and an oil temperature sensing component 33. The input end of the oil tank 31 is connected to the machine tool 1, and the output end of the oil tank 31 is connected to the oil pump 32. A connecting pipe 34 is arranged between the third evaporator 223 and the second condenser 224. The oil pump 32 is connected to the third evaporator 223, and the second condenser 224 is connected to the input end of the machine tool 1. The oil temperature sensing component 33 is connected between the oil pump 32 and the machine tool 1.

[0042] In a preferred embodiment, the oil temperature sensing component 33 includes an inlet oil temperature sensing package 332 and an outlet oil temperature sensing package 331. The inlet oil temperature sensing package 332 is connected between the second condenser 224 and the input end of the machine tool 1, and the outlet oil temperature sensing package 331 is connected to the input end of the oil tank 31 and the output end of the machine tool 1.

[0043] This embodiment also provides a control method for a machine tool oil cooling system, comprising the following steps:

[0044] Step 1: Detect the heat load generated by the machine tool equipment;

[0045] Step 2: When the heat load generated by the processing of the machine tool 1 equipment is large: the refrigerant after the three-way valve (hydraulic valve component 5) flows directly to the throttling component 23 through the flow limiting pipe 24, and will not pass through the second condenser 224 for heat exchange, and then enters the compressor; at the same time, the oil pump 32 extracts the coolant from the oil tank 31 and first sends it to the first evaporator 221 for cooling, and then enters the second evaporator 222 for heating. After that, the cooling oil will directly go to the machine tool 1 processing equipment after passing through the outlet oil temperature sensing package 331 to absorb the processing heat. The coolant coming out of the machine tool 1 processing equipment returns to the oil tank 31 after passing through the inlet oil temperature sensing package 332 for detection.

[0046] Step 3: When the heat load generated by the processing of the machine tool 1 equipment is small: the speed of the DC fan will decrease, reducing the heat exchange of the condenser 1, and the three-way valve will switch the flow direction of the refrigerant. The refrigerant after the three-way valve (hydraulic valve component 5) will pass through the second condenser for heat exchange, and the machine tool 1 coolant that has been cooled by the evaporator will be reheated to the target temperature; at the same time, the oil pump 32 draws coolant from the oil tank 31 and first transports it to the first evaporator 221 for cooling, and then enters the second evaporator 222 for heating. Thereafter, the cooling oil will directly go to the machine tool 1 processing equipment after passing through the outlet oil temperature sensing bag 331 to absorb the processing heat, and the coolant coming out of the machine tool 1 processing equipment will return to the oil tank 31 after passing through the inlet oil temperature sensing bag 332 for detection.

[0047] Compared with the prior art, the beneficial effects of the present invention are as follows: due to the provision of a hydraulic valve component and a DC fan assembly, the heat exchange amount of the cooling oil inside each refrigeration device is changed through the reversal of the hydraulic valve component and the speed adjustment of the DC fan assembly during the operation of the machine tool, and the temperature of the cooling oil is precisely controlled at 0~100% load in a timely and effective manner, which can not only effectively improve the temperature control accuracy of the cooling oil and provide the processing accuracy of the machine tool equipment, but also improve the reliability of the cooling equipment and extend the service life of the machine tool.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the present invention.

Claims

1. A control method for a machine tool oil cooling system, characterized in that: It comprises a machine tool, a refrigeration device, a cooling device, a first condenser, a hydraulic valve component and a DC fan assembly, wherein one end of the machine tool is connected to the refrigeration device, and the other end is connected to the cooling device, the refrigeration device is connected to the cooling device, one end of the hydraulic valve component is connected to the refrigeration device, and the other end is connected to the first condenser, the first condenser is connected to the refrigeration device, and the DC fan assembly is fixed to one side of the first condenser; The hydraulic valve component is a four-way valve; one end of the first evaporator is connected to the compressor, and the other end is connected to the A port of the four-way valve; one end of the second evaporator is connected to the throttling component, and the other end is connected to the B port of the four-way valve; the throttling component is connected to the D port of the four-way valve; one end of the first condenser is connected to the compressor, and the other end is connected to the C port of the four-way valve; The control method comprises: When the heat load generated by the processing of machine tools is small: the compressor transports the high-temperature and high-pressure refrigerant to the first condenser for preliminary heat exchange. At this time, the DC fan assembly runs at a low speed, and then the refrigerant passes through the four-way valve and flows through the second evaporator to continue heat exchange, heating the cooling oil flowing through the second evaporator, and then the refrigerant is throttled through the throttling component. The throttled low-temperature and low-pressure refrigerant enters the first evaporator through the four-way valve, and the refrigerant cools the cooling oil of the first evaporator. After heat exchange in the first evaporator, the refrigerant re-enters the compressor for compression cycle. In this mode, the first evaporator cools the cooling oil, and the second evaporator heats the cooling oil.

2. A control method for a machine tool oil cooling system according to claim 1, characterized in that: The cooling device includes an oil tank, an oil pump, and an oil temperature sensing component. The input end of the oil tank is connected to the machine tool, and the output end of the oil tank is connected to the oil pump. A connecting pipe is provided between the first evaporator and the second evaporator. The oil pump is connected to the first evaporator, and the second evaporator is connected to the input end of the machine tool. The oil temperature sensing component is connected between the oil pump and the machine tool.

3. A control method for a machine tool oil cooling system as claimed in claim 2, characterized in that: The oil temperature sensing component includes an inlet oil temperature sensing package and an outlet oil temperature sensing package. The inlet oil temperature sensing package is connected between the second evaporator and the input end of the machine tool, and the outlet oil temperature sensing package is connected to the input end of the oil tank and the output end of the machine tool.

4. The control method of a machine tool oil cooling system according to claim 1, characterized in that: The hydraulic valve component is a three-way valve; the evaporator assembly includes a second condenser and a third evaporator, one end of the third evaporator is connected to the throttling component, and the other end is connected to the compressor, one end of the second condenser is connected to the E port of the three-way valve, and the other end is connected to the throttling component, the first condenser is connected to the G port of the three-way valve, and a limiting flow tube is also arranged between the second condenser and the three-way valve, one end of the limiting flow tube is connected to the F port of the three-way valve, and the other end is connected to the connection between the second condenser and the throttling component.

5. A control method for a machine tool oil cooling system as claimed in claim 4, characterized in that: The cooling device includes an oil tank, an oil pump, and an oil temperature sensing component. The input end of the oil tank is connected to the machine tool, and the output end of the oil tank is connected to the oil pump. A connecting pipe is provided between the third evaporator and the second condenser. The oil pump is connected to the third evaporator, and the second condenser is connected to the input end of the machine tool. The oil temperature sensing component is connected between the oil pump and the machine tool.

6. A control method for a machine tool oil cooling system as claimed in claim 5, characterized in that: The oil temperature sensing component includes an inlet oil temperature sensing package and an outlet oil temperature sensing package. The inlet oil temperature sensing package is connected between the second condenser and the input end of the machine tool, and the outlet oil temperature sensing package is connected to the input end of the oil tank and the output end of the machine tool.

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