TWI880862B - Hydrocarbon cleaning device of workpiece oil and its use method - Google Patents

Abstract

A hydrocarbon cleaning device of workpiece oil and its use method, which introduces a hydrocarbon solvent into a receiving space until the level of the hydrocarbon solvent reaches the predetermined height, and starts the circulation pump to stir the hydrocarbon solvent in the receiving space, so that the hydrocarbon solvent fully contacts with oil on an outer surface of a workpiece, the oil dissolves in the hydrocarbon solvent more quickly, since the introduced hydrocarbon solvent is about 90 degrees, the surface temperature of the workpiece can be increased to 90 degrees, and by opening an exhaust valve and a vacuum pump, the pressure in the receiving space is reached to about 2000pa, which lets the receiving space to achieve gasification conditions, making the residual hydrocarbon solvent on the surface of the workpiece converted into a gaseous state to dry the surface of the workpiece, and then achieve a rapid, efficient and convenient effect of oil removal.

Description

Carbon-hydrogen cleaning device for oily workpiece and its use method

The present invention relates to a cleaning device for cleaning oil stains on a workpiece, and more particularly to a carbon hydride cleaning device.

The present invention also relates to a method for using the carbon hydrogen cleaning device.

In the past, metal parts were often sprayed with thick protective oil on the surface to prevent rust. When heat treatment or other operations are required on metal parts, the protective oil on the surface of the metal parts needs to be removed first. Known methods for removing the protective oil on the surface of metal parts include ultrasonic vibration and spraying cleaning liquid. However, after removing the protective oil on the surface of the metal parts by the above methods, the residual cleaning liquid on the outer surface of the metal parts still needs to be removed and dried before the next step can be carried out. The above cleaning liquid removal and drying operations are quite time-consuming and there will be concerns about residual cleaning liquid. Therefore, a fast, efficient and convenient oil removal method is needed.

The present invention provides a carbon hydride cleaning device for oil stains on workpieces, the main purpose of which is to provide a fast, efficient and convenient oil stain removal device.

To achieve the above-mentioned purpose, the carbon-hydrogen cleaning device for oily workpieces of the present invention comprises:

A cleaning tank having a receiving space for receiving a workpiece;

an air inlet pipe connected to the cleaning tank, the air inlet pipe being in communication with the accommodating space, and the air inlet pipe being used to input gas into the accommodating space;

an intake valve installed in the intake pipe, the intake valve is used to control the flow of gas in the intake pipe;

a new liquid tank connected to the containing space through a first pipe, the new liquid tank is used to contain the hydrocarbon solvent, and the first pipe is used to transport the hydrocarbon solvent to the containing space;

a first valve installed in the first pipeline, the first valve is used to control the flow rate of the hydrocarbon solvent in the first pipeline;

a waste liquid tank, connected to the containing space through a second pipe, the waste liquid tank is used to contain the carbon-hydrogen solvent after cleaning the workpiece, and the second pipe is used to transport the carbon-hydrogen solvent from the containing space to the waste liquid tank;

a second valve installed in the second pipeline, the second valve is used to control the flow rate of the hydrocarbon solvent in the second pipeline;

a heat exchange system for cooling the hydrocarbon solvent;

a recovery pipe connected to the waste liquid tank and the new liquid tank, the recovery pipe is used to transport the hydrocarbon solvent, the recovery pipe cooperates with the heat exchange system, and the vaporized hydrocarbon solvent in the recovery pipe is cooled and condensed into a liquid hydrocarbon solvent after passing through the heat exchange system;

At least one vacuum pump, the vacuum pump is installed in the recovery pipe, and the vacuum pump is used to extract the vaporized hydrocarbon solvent in the waste liquid tank;

a recovery valve installed on the recovery pipe, the recovery valve is used to control the flow rate of the hydrocarbon solvent in the recovery pipe;

an exhaust pipe connected to the cleaning tank, the exhaust pipe being in communication with the accommodating space, the exhaust pipe further having an exhaust outlet, the exhaust pipe being used to discharge the gas in the accommodating space from the exhaust outlet, the vacuum pump being installed on the exhaust pipe;

an exhaust valve installed on the exhaust pipe, the exhaust valve is used to control the flow rate of gas in the exhaust pipe;

a circulation pipe connected to the cleaning tank, the circulation pipe being in communication with the containing space, and the circulation pipe being used for conveying a carbon hydrogen solvent;

a circulation pump installed in the circulation pipe, the circulation pump is used to stir the hydrocarbon solvent in the accommodating space; and

A heating unit is provided for heating the waste liquid tank and the new liquid tank.

The present invention also provides a method for using a carbon-hydrogen cleaning device for cleaning oily workpieces, comprising:

An inserting step, placing a workpiece with oil stains into a containing space of a cleaning tank;

an exhaust step, closing a first valve, a second valve, a recovery valve, and an air inlet valve, opening an exhaust valve, and starting a vacuum pump until the vacuum degree in the accommodating space reaches 90-110 Pa, preferably 100 Pa, and then closing the vacuum pump and the exhaust valve;

a hydrocarbon solvent introduction step, opening the first valve, and introducing the hydrocarbon solvent in the new liquid tank into the containing space through the negative pressure in the containing space, wherein the introduced hydrocarbon solvent has a temperature of 85° C. to 95° C., preferably, the introduced hydrocarbon solvent has a temperature of 90° C., until the liquid level of the hydrocarbon solvent reaches a predetermined height, and then closing the first valve;

a stirring step, starting a circulation pump to stir the hydrocarbon solvent in the accommodating space, and raising the surface temperature of the workpiece to 85°C-95°C through the hydrocarbon solvent, preferably, raising the surface temperature of the workpiece to 90°C;

a hydrocarbon solvent outlet step, closing the circulation pump and opening the second valve and the air inlet valve, introducing gas into the containing space, and discharging the hydrocarbon solvent in the containing space into the waste liquid tank, wherein the temperature in the waste liquid tank is maintained at 85°C to 95°C, and the pressure is maintained at 1700 to 2300 Pa, and the hydrocarbon solvent in the waste liquid tank is maintained in a gasified state;

Preferably, the waste liquid tank is maintained at a temperature of 90°C and a pressure of 2000 Pa.

a drying step, after the hydrocarbon solvent in the accommodating space is exhausted, the second valve and the recovery valve are closed, and the exhaust valve and the vacuum pump are opened, so that the pressure in the accommodating space reaches 1700-2300 Pa, preferably 2000 Pa, so that the hydrocarbon solvent remaining on the surface of the workpiece is converted into gaseous state, and the surface of the workpiece is dried;

A step of restoring normal pressure: after drying, the exhaust valve is closed and the air inlet valve is opened, and when the accommodating space returns to normal pressure, the air inlet valve is closed and the cleaning tank is opened to take out the workpiece.

As can be seen from the foregoing, the present invention mainly introduces a hydrocarbon solvent into the containing space until the liquid level of the hydrocarbon solvent reaches a predetermined height, and starts the circulation pump to stir the hydrocarbon solvent in the containing space, so that the hydrocarbon solvent fully contacts the oil stains on the outer surface of the workpiece, so that the oil stains are dissolved in the hydrocarbon solvent more quickly. In addition, since the introduced hydrocarbon solvent is at a temperature of 85°C to 95°C, The surface temperature of the workpiece can be raised to 85°C~95°C, and by opening the exhaust valve and the vacuum pump, the pressure in the accommodating space can reach 1700~2300pa, so that the accommodating space can reach the gasification condition, so that the hydrocarbon solvent remaining on the surface of the workpiece is converted into gas, the surface of the workpiece is dried, and the effect of removing oil stains quickly, efficiently and conveniently is achieved.

The present invention provides a carbon-hydrogen cleaning device for oily workpieces, as shown in FIGS. 1-2 , comprising:

A cleaning tank 10 having a receiving space 11 for receiving a workpiece;

An air inlet pipe A connected to the cleaning tank 10, the air inlet pipe A is in communication with the accommodating space 11, and the air inlet pipe A is used to input gas into the accommodating space 11;

An intake valve A1 is installed in the intake pipe A, and the intake valve A1 is used to control the flow rate of the gas in the intake pipe A;

A new liquid tank 20 is connected to the containing space 11 through a first pipe 21. The new liquid tank 20 is used to contain a newly added hydrocarbon solvent or a filtered hydrocarbon solvent. The first pipe 21 is used to transport the hydrocarbon solvent to the containing space 11. The hydrocarbon solvent in the new liquid tank 20 is maintained at 85°C to 95°C, preferably maintained at 90°C;

a first valve 22 installed in the first pipeline 21, the first valve 22 is used to control the flow rate of the hydrocarbon solvent in the first pipeline 21;

A waste liquid tank 30 is connected to the accommodating space 11 through a second pipe 31. The waste liquid tank 30 is used to accommodate the hydrocarbon solvent after cleaning the workpiece. The hydrocarbon solvent in the accommodating space 11 is transported from the second pipe 31 to the waste liquid tank 30;

a second valve 32 installed in the second pipeline 31, the second valve 32 is used to control the flow rate of the hydrocarbon solvent in the second pipeline 31;

A heat exchange system 40 is provided to cool the hydrocarbon solvent to reduce the temperature of the hydrocarbon solvent. The heat exchange system 40 is provided to cool the vaporized hydrocarbon solvent to cool and condense the vaporized hydrocarbon solvent to form a liquid hydrocarbon solvent. In this embodiment, the heat exchange system 40 has a cooling water tower 41, a water pump 42, and a cooling water tower 41. , a cooling water circuit 43 and a heat exchanger 44, the cooling water circuit 43 is connected to the cooling water tower 41, the water pump 42 is installed in the cooling water circuit 43, the cooling water circuit 43 and the heat exchanger 44 cooperate with each other, in this embodiment, the cooling water circuit 43 is connected to the heat exchanger 44;

a recovery pipe 50, connected to the waste liquid tank 30 and the new liquid tank 20, the recovery pipe 50 is used to transport the hydrocarbon solvent, the recovery pipe 50 cooperates with the heat exchange system 40, the heat exchange system 40 is used to cool the hydrocarbon solvent in the recovery pipe 50, the recovery pipe 50 is used to output the hydrocarbon solvent vaporized in the waste liquid tank 30, and the hydrocarbon solvent vaporized in the recovery pipe 50 is cooled and condensed after passing through the heat exchange system 40 to form a liquid hydrocarbon solvent, and the liquid hydrocarbon solvent is continuously transported to the new liquid tank 20 through the recovery pipe 50. In this embodiment, the recovery pipe 50 is connected to the heat exchanger 44;

At least one vacuum pump P, the vacuum pump P is installed in the recovery pipe 50, and the vacuum pump P is used to extract the vaporized hydrocarbon solvent in the waste liquid tank 30;

A recovery valve 51 installed in the recovery pipe 50, the recovery valve 51 is used to control the flow rate of the hydrocarbon solvent in the recovery pipe 50. In this embodiment, the recovery valve 51 is located between the vacuum pump P and the heat exchange system 40 or/and between the waste liquid tank 30 and the vacuum pump P;

An exhaust pipe 60 is connected to the cleaning tank 10. The exhaust pipe 60 is connected to the accommodating space 11. The vacuum pump P is installed in the exhaust pipe 60.

The exhaust pipe 60 further has an exhaust outlet 61, and the exhaust pipe 60 is used to discharge the gas in the accommodating space 11 from the exhaust outlet 61;

an exhaust valve 62 installed in the exhaust pipe 60, the exhaust valve 62 is used to control the flow of gas in the exhaust pipe 60, in this embodiment, the exhaust valve 62 is located between the vacuum pump P and the exhaust outlet 61;

In this embodiment, please refer to FIG. 1 , there is another common pipe section B, the number of the vacuum pump P is one, and the vacuum pump P is installed in the common pipe section B; the recovery pipe 50 includes a first pipe section 50A, the common pipe section B and a second pipe section 50B connected, one end of the first pipe section 50A is connected to the waste liquid tank 30, the other end of the first pipe section 50A is connected to one end of the common pipe section B, one end of the second pipe section 50B is connected to the other end of the common pipe section B, and the other end of the second pipe section 50B is connected to the new liquid tank 20, the number of the recovery valve 51 is two, and one of the recovery valves 51 is installed in the first recovery valve 51. A pipe section 50A, another recovery valve 51 is installed on the second pipe section 50B; the exhaust pipe 60 includes a front pipe section 60A, the common pipe section B and a rear pipe section 60B connected, one end of the front pipe section 60A is connected to the accommodating space 11, the other end of the front pipe section 60A is connected to one end of the common pipe section B, one end of the rear pipe section 60B is connected to the other end of the common pipe section B, and the other end of the rear pipe section 60B has the exhaust outlet 61. The number of the exhaust valves 62 is two, one of which is installed on the front pipe section 60A, and the other is installed on the rear pipe section 60B.

In another embodiment, please refer to Figure 2, the exhaust pipe 60 and the recovery pipe 50 are both independent pipes, the number of the vacuum pumps P is two, one of the vacuum pumps P is connected to the recovery pipe 50, and the other vacuum pump P is connected to the exhaust pipe 60, the vacuum pump P is used to extract the gas in the waste liquid tank 30 to the recovery pipe 50, the recovery valve 51 is used to control the gas flow in the recovery pipe 50, and the gas extracted from the waste liquid tank 30 by the vacuum pump P is discharged from the new liquid tank 20.

Preferably, please refer to FIG. 2 , the new liquid tank 20 is further connected to an air outlet pipe 23, and the gas extracted by the vacuum pump P is discharged from the air outlet pipe 23. The air outlet pipe 23 is further connected to an oil mist filter 24, and the oil mist filter 24 is used to filter oil and gas to ensure that the discharged gas does not contain oil and gas.

A circulation pipe 70 is connected to the cleaning tank 10. The circulation pipe 70 is in communication with the accommodating space 11. In this embodiment, both ends of the circulation pipe 70 are in communication with the accommodating space 11. The circulation pipe 70 is used to transport the hydrocarbon solvent.

A circulation pump 71 is installed on the circulation pipe 70 , and the circulation pump 71 is used to stir the hydrocarbon solvent in the accommodating space 11 .

A heating unit 80 is provided for heating the waste liquid tank 30 and the new liquid tank 20. In this embodiment, the heating unit 80 has a hot oil tank 81, a hot oil pipe 82 and an oil pump 83. The hot oil tank 81 is provided for accommodating hot oil. The hot oil pipe 82 is connected to the hot oil tank 81. The hot oil pipe 82 is provided for transporting hot oil. The hot oil pipe 82 extends into the waste liquid tank 30 and the new liquid tank 20 to heat the hydrocarbon solvent in the waste liquid tank 30 and the new liquid tank 20. The oil pump 83 is installed on the hot oil pipe 82. In this embodiment, the heating unit 80 is provided for keeping the hydrocarbon solvent in the waste liquid tank 30 and the new liquid tank 20 at 85°C to 95°C, preferably at 90°C.

A liquid level sensor 90 is installed in the cleaning tank 10 , and the liquid level sensor 90 is used to detect the liquid level of the hydrocarbon solvent in the accommodating space 11 .

The present invention also provides a method for using a carbon-hydrogen cleaning device for cleaning oily workpieces, as shown in FIGS. 3 to 6 , including:

An inserting step S1 is to insert the oily workpiece into the containing space 11 of the cleaning tank 10;

An exhaust step S2, closing the first valve 22, the second valve 32, the recovery valve 51, and the air inlet valve A1, opening the exhaust valve 62, and starting the vacuum pump P until the vacuum degree in the accommodating space 11 reaches 90-110 Pa, and then closing the vacuum pump P and the exhaust valve 62;

A hydrocarbon solvent introduction step S3, opening the first valve 22, and introducing the hydrocarbon solvent in the new liquid tank 20 into the accommodating space 11 through the negative pressure in the accommodating space 11, wherein the introduced hydrocarbon solvent is at a temperature of 85°C to 95°C, preferably 90°C, until the liquid level of the hydrocarbon solvent reaches a predetermined height, and then closing the first valve 22. In this embodiment, the predetermined height may be a liquid level that submerges the workpiece;

A stirring step S4, starting the circulation pump 71 to stir the hydrocarbon solvent in the accommodating space 11, so that the hydrocarbon solvent fully contacts the oil stains on the outer surface of the workpiece, so that the oil stains are dissolved in the hydrocarbon solvent more quickly, and the surface temperature of the workpiece is increased to 85°C to 95°C, preferably 90°C, through the hydrocarbon solvent;

A hydrocarbon solvent outlet step S5, closing the circulation pump 71 and opening the second valve 32 and the air inlet valve A1 to introduce gas into the accommodating space 11, and discharge the hydrocarbon solvent in the accommodating space 11 to the waste liquid tank 30. The waste liquid tank 30 is maintained at a temperature of 85°C to 95°C and a pressure of 1700 to 2300 Pa, so that the hydrocarbon solvent in the waste liquid tank 30 is maintained in a gasified state;

Preferably, the waste liquid tank 30 is maintained at a temperature of 90°C and a pressure of 2000 Pa.

A drying step S6, when the hydrocarbon solvent in the accommodating space 11 is completely discharged, the second valve 32 and the recovery valve 51 are closed, and the exhaust valve 62 and the vacuum pump P are opened, so that the pressure in the accommodating space 11 reaches 1700-2300 Pa. At this time, since the surface temperature of the workpiece is 85°C-95°C and the pressure in the accommodating space 11 is 1700-2300 Pa, the gasification condition is achieved, so that the hydrocarbon solvent remaining on the surface of the workpiece is converted into gaseous state, so as to dry the surface of the workpiece;

Preferably, the pressure in the accommodating space 11 reaches 2000 Pa and the surface temperature of the workpiece is 90°C.

A normal pressure recovery step S7 is performed. When drying is completed, the exhaust valve 62 is closed and the air inlet valve A1 is opened. After the accommodating space 11 returns to normal pressure, the air inlet valve A1 is closed and the cleaning tank 10 is opened to remove the workpiece.

In a preferred embodiment, please refer to FIG. 4 , between the drying step S6 and the normal pressure restoration step S7, the following steps are further included:

In a recovery step S8, the exhaust valve 62 is closed and the recovery valve 51 is opened to extract the gaseous hydrocarbon solvent in the waste liquid tank 30. After the gaseous hydrocarbon solvent passes through the heat exchange system 40, it is cooled and condensed into a liquid hydrocarbon solvent, and the liquid hydrocarbon solvent is transported to the new liquid tank 20 to complete the recovery. It is worth mentioning that Although the hydrocarbon solvent discharged into the waste liquid tank 30 is mixed with oil pollution, the waste liquid tank 30 is maintained at a temperature of 85°C to 95°C and a pressure of 1700 to 2300 Pa, so that the hydrocarbon solvent in the waste liquid tank 30 is gasified, and the hydrocarbon solvent is separated from the oil pollution, so that the hydrocarbon solvent transported to the new liquid tank 20 does not contain oil pollution;

In another preferred embodiment, referring to FIG. 5 , the recovery step S8 is performed after the hydrocarbon solvent introduction step S3 and before the hydrocarbon solvent withdrawal step S5 . Preferably, the recovery step S8 is performed simultaneously with the stirring step S4 .

In another preferred embodiment, referring to FIG. 6 , the recovery step S8 is performed once after the hydrocarbon solvent introducing step S3 and before the hydrocarbon solvent outlet step S5 , and the recovery step S8 is performed again between the drying step S6 and the normal pressure restoring step S7 .

As can be seen from the foregoing, the present invention mainly introduces hydrocarbon solvent into the accommodating space 11 until the liquid level of the hydrocarbon solvent reaches a predetermined height, and starts the circulation pump 71 to stir the hydrocarbon solvent in the accommodating space 11, so that the hydrocarbon solvent fully contacts the oil stains on the outer surface of the workpiece, so that the oil stains are dissolved in the hydrocarbon solvent more quickly. In addition, since the introduced hydrocarbon solvent is at a temperature of 85°C to 95°C, The surface temperature of the workpiece can be raised to 85°C~95°C, and by opening the exhaust valve 62 and the vacuum pump P, the pressure in the accommodating space 11 reaches 1700~2300pa, so that the accommodating space 11 reaches a gasification condition, and the hydrocarbon solvent remaining on the surface of the workpiece is converted into a gaseous state, drying the surface of the workpiece, thereby achieving a fast, efficient and convenient effect of removing oil stains.

10: Cleaning tank 11: Storage space 20: New liquid tank 21: First pipeline 22: First valve 23: Exhaust pipe 24: Oil mist filter 30: Waste liquid tank 31: Second pipeline 32: Second valve 40: Heat exchange system 41: Cooling water tower 42: Water pump 43: Cooling water loop 44: Heat exchanger 50: Recovery pipe 50A: First pipe section 50B: Second pipe section 51: Recovery valve 60: Exhaust pipe 60A: Front pipe section 60B: Rear pipe section 61: Exhaust outlet 62: Exhaust valve 70: Circulation pipe 71: Circulation pump 80: Heating unit 81: Hot oil tank 82: Hot oil pipe 83: Oil pump 90: Liquid level gauge A: Intake pipe A1: Intake valve B: Common pipe section P: Vacuum pump S1: Insertion step S2: Exhaust step S3: Introducing hydrocarbon solvent step S4: Stirring step S5: Leading out hydrocarbon solvent step S6: Drying step S7: Restoring normal pressure step S8: Recovery step

FIG1 is a schematic diagram of one embodiment of the carbon hydride cleaning device for oil stains on workpieces of the present invention. FIG2 is a schematic diagram of another embodiment of the carbon hydride cleaning device for oil stains on workpieces of the present invention. FIG3 is a flow chart of the method of using the carbon hydride cleaning device for oil stains on workpieces of the present invention. FIG4 is a flow chart of a preferred embodiment of the method of using the carbon hydride cleaning device for oil stains on workpieces of the present invention. FIG5 is a flow chart of a preferred embodiment of the method of using the carbon hydride cleaning device for oil stains on workpieces of the present invention. FIG6 is a flow chart of a preferred embodiment of the method of using the carbon hydride cleaning device for oil stains on workpieces of the present invention.

10: Cleaning tank

11: Storage space

20: New tank

21: First pipeline

22: First valve

23: Exhaust pipe

24: Oil mist filter

30: Wastewater tank

31: Second pipeline

32: Second valve

40:Heat exchange system

41: Cooling water tower

42: Water pump

43: Cooling water circuit

44: Heat exchanger

50: Recovery tube

50A: First pipe section

50B: Second pipe section

51: Recovery valve

60: Exhaust pipe

60A: front pipe section

60B: Rear pipe section

61: Exhaust outlet

62: Exhaust valve

70: Circulation tube

71: Circulation pump

80: Heating unit

81: Hot oil tank

82: Hot oil pipe

83: Oil pump

90: Liquid level device

A: Intake pipe

A1: Intake valve

B: Common pipe section

P: Vacuum pump

Claims (11)

A carbon hydride cleaning device for oil stains on a workpiece comprises: A cleaning tank having a containing space for containing a workpiece; An air inlet pipe connected to the cleaning tank, the air inlet pipe communicating with the containing space, the air inlet pipe for inputting gas into the containing space; An air inlet valve installed on the air inlet pipe, the air inlet valve for controlling the flow of gas in the air inlet pipe; A new liquid tank communicating with the containing space through a first pipeline, the new liquid tank for containing carbon hydride solvent, the first pipeline for conveying carbon hydride solvent to the containing space; A first valve installed on the first pipeline, the first valve for controlling the flow of carbon hydride solvent in the first pipeline; A waste liquid tank is connected to the storage space through a second pipe. The waste liquid tank is used to store the hydrocarbon solvent after cleaning the workpiece. The second pipe is used to transport the hydrocarbon solvent from the storage space to the waste liquid tank; A second valve is installed on the second pipe. The second valve is used to control the flow rate of the hydrocarbon solvent in the second pipe; A heat exchange system is used to cool the hydrocarbon solvent; A recovery pipe is connected to the waste liquid tank and the new liquid tank. The recovery pipe is used to transport the hydrocarbon solvent. The recovery pipe cooperates with the heat exchange system. When the vaporized hydrocarbon solvent in the recovery pipe passes through the heat exchange system, it is cooled and condensed into a liquid hydrocarbon solvent; At least one vacuum pump, which is installed on the recovery pipe, and is used to extract the vaporized hydrocarbon solvent in the waste liquid tank; a recovery valve, which is installed on the recovery pipe, and is used to control the flow of the hydrocarbon solvent in the recovery pipe; an exhaust pipe, which is connected to the cleaning tank, is connected to the storage space, and has an exhaust outlet, which is used to discharge the gas in the storage space from the exhaust outlet, and the vacuum pump is installed on the exhaust pipe; an exhaust valve, which is installed on the exhaust pipe, and is used to control the flow of the gas in the exhaust pipe; a circulation pipe, which is connected to the cleaning tank, is connected to the storage space, and is used to transport the hydrocarbon solvent; A circulation pump installed in the circulation pipe, the circulation pump is used to stir the hydrocarbon solvent in the containing space; and a heating unit is used to heat the waste liquid tank and the new liquid tank. A carbon hydrogen cleaning device for oily workpiece pollution as described in claim 1, wherein both ends of the circulation pipe are connected to the accommodating space. A carbon-hydrogen cleaning device for oily workpieces as described in claim 1, wherein the heating unit has a hot oil tank, a hot oil pipe and an oil pump, the hot oil tank is used to contain hot oil, the hot oil pipe is connected to the hot oil tank, the hot oil pipe is used to transport hot oil, the hot oil pipe extends into the waste liquid tank and the new liquid tank, and the oil pump is installed on the hot oil pipe. A hydrocarbon cleaning device for oily workpieces as described in claim 1, wherein the heat exchange system has a cooling water tower, a water pump, a cooling water circuit and a heat exchanger, the cooling water circuit is connected to the cooling water tower, the water pump is installed in the cooling water circuit, the cooling water circuit is coordinated with the heat exchanger, and the heat exchange system is used to cool the vaporized hydrocarbon solvent. A carbon-hydrogen cleaning device for oily workpieces as described in claim 1, further comprising a liquid level meter installed in the cleaning tank. As described in claim 1, the carbon hydride cleaning device for oil stains on workpieces, wherein the exhaust pipe and the recovery pipe are both independent pipes, and the number of the vacuum pumps is two, one of which is connected to the recovery pipe and the other is connected to the exhaust pipe. The carbon hydride cleaning device for oil stains on workpieces as described in claim 1, wherein there is another common pipe section, the number of the vacuum pump is one, and the vacuum pump is installed in the common pipe section; the recovery pipe includes a first pipe section, the common pipe section and a second pipe section, one end of the first pipe section is connected to the waste liquid tank, the other end of the first pipe section is connected to one end of the common pipe section, one end of the second pipe section is connected to the other end of the common pipe section, and the other end of the second pipe section is connected to the new liquid tank, the number of the recovery valve is two, wherein One recovery valve is installed on the first pipe section, and the other recovery valve is installed on the second pipe section; the exhaust pipe includes a front pipe section, the common pipe section and a rear pipe section that are connected, one end of the front pipe section is connected to the accommodating space, the other end of the front pipe section is connected to one end of the common pipe section, one end of the rear pipe section is connected to the other end of the common pipe section, and the other end of the rear pipe section has the exhaust outlet. The number of the exhaust valves is two, one of which is installed on the front pipe section, and the other is installed on the rear pipe section. A method for using a carbon hydride cleaning device for oily workpieces, comprising: an inserting step, placing a workpiece with oily dirt into a containing space of a cleaning tank; an exhausting step, closing a first valve, a second valve, a recovery valve, an air inlet valve, opening an exhaust valve, starting a vacuum pump, until the vacuum degree in the containing space reaches 90~110Pa, and then closing the vacuum pump and the exhaust valve; an introducing carbon hydride solvent step, opening the first valve, and through the negative pressure in the containing space, the The hydrocarbon solvent in the new liquid tank is introduced into the containing space, and the temperature of the introduced hydrocarbon solvent is 85°C~95°C, until the liquid level of the hydrocarbon solvent reaches a predetermined height, and then the first valve is closed; A stirring step, starting a circulation pump to stir the hydrocarbon solvent in the containing space, and the surface temperature of the workpiece is raised to 85°C~95°C through the hydrocarbon solvent; A step of leading out the hydrocarbon solvent, closing the circulation pump and opening the second valve and the air inlet valve, Gas is introduced into the accommodation space, and the hydrocarbon solvent in the accommodation space is discharged into a waste liquid tank, the waste liquid tank is maintained at a temperature of 85°C~95°C, and a pressure of 1700~2300pa, and the hydrocarbon solvent in the waste liquid tank is maintained in a gasified state; A drying step, when the hydrocarbon solvent in the accommodation space is completely discharged, the second valve and the recovery valve are closed, and then the exhaust valve and the vacuum pump are opened, so that the pressure in the accommodation space reaches 1700~2300pa, so that the hydrocarbon solvent remaining on the surface of the workpiece is converted into a gaseous state, and the surface of the workpiece is dried; A step of restoring normal pressure: after drying, close the exhaust valve and open the air intake valve, wait for the storage space to return to normal pressure, close the air intake valve and open the cleaning tank, and take out the workpiece. The method for using the carbon hydride cleaning device for oil stains on workpieces as described in claim 8, wherein, between the drying step and the normal pressure restoration step, there is further included: a recovery step, closing the exhaust valve and opening the recovery valve to extract the gaseous carbon hydride solvent in the waste liquid tank, and the gaseous carbon hydride solvent is cooled and condensed into a liquid carbon hydride solvent after passing through a heat exchange system, and the liquid carbon hydride solvent is transported to the new liquid tank. The method for using the hydrocarbon cleaning device for oil stains on workpieces as described in claim 8 further includes, after the step of introducing the hydrocarbon solvent and before the step of leading out the hydrocarbon solvent, a recovery step of closing the exhaust valve and opening the recovery valve to extract the gaseous hydrocarbon solvent in the waste liquid tank, and the gaseous hydrocarbon solvent is cooled and condensed into a liquid hydrocarbon solvent after passing through a heat exchange system, and the liquid hydrocarbon solvent is transported to the new liquid tank. A method for using a hydrocarbon cleaning device for oil stains on a workpiece as described in claim 8, wherein, in the exhaust step, the vacuum degree in the accommodation space reaches 100Pa, in the step of introducing a hydrocarbon solvent, the temperature of the introduced hydrocarbon solvent is 90°C, in the stirring step, the surface temperature of the workpiece is increased to 90°C, in the step of leading out the hydrocarbon solvent, the temperature in the liquid tank is maintained at 90°C and the pressure is 2000Pa, and in the drying step, the pressure in the accommodation space reaches 2000Pa.

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