Systems and methods for co2 gas temperature control and dry ice particle treatment coupling

Abstract

The application discloses a CO2 gas temperature control and dry ice particle processing coupling system, application and method, solves the problem of inconvenient control of CO2 gas temperature in the low-temperature processing process in the prior art, has the beneficial effect of effectively controlling the CO2 gas temperature, and specifically has the beneficial effect of effectively controlling the CO2 gas temperature, and the specific scheme is as follows: a CO2 gas temperature control and dry ice particle processing coupling system, the gas temperature control unit comprises a working cavity, the working cavity comprises a plurality of gas chambers, adjacent two gas chambers are in communication or disconnected, one side of the working cavity is in communication with a first storage tank, the first storage tank provides heat exchange medium to the working cavity, each gas chamber is in communication with a second storage tank to temporarily store the heat exchange medium after heat exchange, and the first storage tank is in communication with the second storage tank; the dry ice particle processing unit comprises a gas pipeline arranged in each gas chamber, each gas pipeline is arranged in the corresponding gas chamber, the gas pipelines of adjacent two gas chambers are in communication, and the gas pipeline is used for passing low-temperature CO2.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical processing, in particular to a CO2 gas temperature control and dry ice particle processing coupled system and method. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute the prior art.

[0003] With the rapid development of high-end equipment in various fields, high-efficiency and precision low-damage machining of titanium alloy difficult-to-machine materials has become a key technology in the main technology group of advanced manufacturing. However, due to the low thermal conductivity, low elastic modulus, high chemical activity and other characteristics of titanium alloy, the cutting force and heat in the cutting zone rise sharply during cutting (especially grinding), which easily leads to fast tool wear, low material removal rate and other problems, and seriously affects the machining surface quality and machining precision. Therefore, as a typical difficult-to-machine material, titanium alloy has very high requirements for cutting environment.

[0004] In industry, the use of water-based coolants for cooling and lubrication is the most common method. When machining Ti-6Al-4V using traditional coolants, the cutting speed range is only 30-60 m / min. In addition, traditional pouring type cutting fluids contain harmful substances such as nitrite, which not only poses a threat to the environment and the health of operators, but also greatly increases the cost of cutting fluid post-processing, and has already been unable to meet the current green and efficient requirements.

[0005] In order to realize a cleaner production process, some green manufacturing technologies such as minimum quantity lubrication (MQL), cryogenic cooling minimum quantity lubrication (CMQL) and nanofluid minimum quantity lubrication (NMQL) have been developed to effectively improve machining performance and reduce hazards.

[0006] MQL, as an environmentally friendly process, can improve overall machining quality to some extent. Compared with dry cutting, MQL improves tool life and surface quality under different cutting conditions. Although the effectiveness of MQL has been proven by a large number of studies, some scholars have found that due to the insufficient cooling capacity of air flow, the machinability of MQL is limited when machining difficult-to-machine materials at high speed, which may lead to large cutting force, high cutting temperature and failure of lubrication function.

[0007] Therefore, as an improvement of traditional MQL technology, scholars combine low-temperature technology with minimum quantity lubrication technology to form cryogenic minimum quantity lubrication (CMQL). CMQL is an important green cutting technology. CMQL introduces compressed subzero gas or other low-temperature medium (such as nitrogen, liquid nitrogen (LN2)), and supercritical CO2 (sc(CO2)) together with MQL mist to enhance cooling and lubrication. This method combines the advantages of MQL and low-temperature machining, significantly improves the heat transfer efficiency in the cutting area, and eliminates the limitations of MQL. The use of CMQL technology can reduce cutting force and tool wear, effectively suppress the generation of cutting temperature, and improve tool life. The lubrication effect of CMQL is equivalent to that of traditional cutting fluid, but the amount of lubricating fluid is only 1% of that of traditional cutting fluid.

[0008] CO2 is one of the most commonly used media in low-temperature processing, and its temperature directly affects the heat transfer efficiency in the processing and the surface quality of the processed workpiece. Therefore, in the low-temperature processing process using CO2 as the heat transfer medium, liquid CO2 is converted into gas with solid particles when the pressure changes suddenly. During the conversion of liquid CO2 into gas, the temperature drops, and the converted gas is directly input into the nozzle for low-temperature lubrication, which cannot achieve reasonable control of the temperature of CO2 gas. Moreover, the dry ice particles contained in the gas not only easily affect the surface processing quality of the workpiece, but also easily block the nozzle. Therefore, it is particularly important to reasonably control the temperature range of CO2 gas and reduce the influence of dry ice particles on the surface quality of the workpiece.

[0009] A multi-loop circulating gas temperature control method (patent number: 202010376436.6) in the prior art discloses a multi-loop circulating gas temperature control method. The invention sets up two independent heating circuits and cooling circuits, and sets up the heating circuit and the cooling circuit as multi-segment detour circuits, and sets up an outlet and an electromagnetic valve at the detour segment near the gas outlet of the heating circuit and the cooling circuit. Different required gases are heated or cooled through the heating circuit and the cooling circuit, respectively, and the temperature of the gas in each detour segment is monitored by the temperature sensor arranged in each detour segment, and the heat absorption device or the heating device is used to control the temperature of the gas, and finally discharged at the set temperature detour segment. The invention sets up the heating circuit and the cooling circuit as multi-segment detour circuits, which can heat or cool the gas in a small floor space, and can control different temperatures in different detour segments. In addition, the heat absorbed by the cooling circuit can provide a certain heat source for the heating circuit, reducing energy consumption.

[0010] In addition, a dry ice particle processor and a dry ice particle processing method (patent number: 201510560465.7) discloses a dry ice particle processor and a dry ice particle processing method, which utilizes the method of vertically arranging pipes, reducing pipe diameter and setting screen to crush dry ice particles for multiple times. The invention solves the problem that the particle diameter of dry ice particles is large, the destructive power is large, and the cleaning of instruments or equipment with high precision requirements cannot be realized, and improves the particle cleaning status of the dry ice cleaning industry.

[0011] But the above-mentioned scheme is not for CO2 gas temperature control system in low temperature processing process, can't control the CO2 gas temperature before entering the nozzle reasonably, also can't effectively process dry ice particles, can't completely adapt to CMQL low temperature processing system. SUMMARY

[0012] In view of the deficiencies of the prior art, the purpose of the present application is to provide a CO2 gas temperature control and dry ice particle processing coupling system, which realizes the coupling of gas temperature control and dry ice particle processing, can control the CO2 gas temperature and effectively process the dry ice particles.

[0013] In order to achieve the above-mentioned purpose, the present application is realized by the following technical scheme:

[0014] A CO2 gas temperature control and dry ice particle processing coupling system, comprising:

[0015] The gas temperature control unit comprises a working cavity, the working cavity comprises a plurality of gas chambers, the adjacent two gas chambers are connected or disconnected, one side of the working cavity is connected with a first storage tank, the first storage tank provides heat exchange medium to the working cavity, each gas chamber is connected with a second storage tank to temporarily store the heat exchanged heat exchange medium, the first storage tank is connected with the second storage tank;

[0016] The dry ice particle processing unit comprises a gas pipeline arranged in each gas chamber, each gas pipeline is arranged in the corresponding gas chamber, the gas pipelines of the adjacent two gas chambers are connected, the gas pipeline is used for passing low temperature CO2, and the dry ice crushing piece is arranged in the gas pipeline.

[0017] The dry ice crushing piece comprises a rotating grid arranged in the gas pipeline, the rotating grid is supported in the gas pipeline through a connecting rod, the rotating grid comprises a rotating shaft, one end of the rotating shaft is connected with a rotating power source, and the other end of the rotating shaft is connected with a plurality of blades.

[0018] The blade has a set thickness, and a plurality of through holes are arranged along the thickness direction of the blade.

[0019] A CO2 gas temperature control and dry ice particle processing coupled system as described above, the volume of the gas chamber in the working cavity gradually increases from one side of the working cavity communicating with the first storage tank to the other side of the working cavity, so as to gradually slow down the rate of dry ice flow.

[0020] A CO2 gas temperature control and dry ice particle processing coupled system as described above, the gas pipeline is arranged in an inverted U shape, and the height of the gas pipeline is less than the height of the gas chamber.

[0021] One gas pipeline passes through the side wall of the working cavity to form a CO2 gas inlet, and the other gas pipeline passes through the side wall of the working cavity to form a CO2 gas outlet.

[0022] A CO2 gas temperature control and dry ice particle processing coupled system as described above, a first electromagnetic valve is arranged between two adjacent gas chambers to control the number of open gas chambers, and a second electromagnetic valve communicating with the second storage tank is arranged in each gas chamber.

[0023] A CO2 gas temperature control and dry ice particle processing coupled system as described above, a first temperature sensor is arranged in each gas chamber, and the corresponding first temperature sensor, the first electromagnetic valve and the second electromagnetic valve in each gas chamber are individually connected to a controller, when the gas temperature in the gas chamber reaches a set value, the controller controls the first electromagnetic valve to open to increase the number of gas chambers, and / or controls the second electromagnetic valve to open to discharge the heat exchange medium into the second storage tank.

[0024] A CO2 gas temperature control and dry ice particle processing coupled system as described above, a third storage tank is connected between the first storage tank and the second storage tank, an electromagnetic valve is arranged in the second storage tank and the third storage tank, and an adjusting valve is arranged between the first storage tank and the working cavity, the adjusting valve and the electromagnetic valve in the second storage tank are individually connected to a control unit.

[0025] A temperature control assembly is arranged in the third storage tank, the temperature control assembly comprises a second temperature sensor, a temperature controller and a heat exchanger, the heat exchanger, the second temperature sensor and the electromagnetic valve in the third storage tank are connected to the temperature controller to control the temperature of the heat exchange medium entering the first storage tank.

[0026] A CO2 gas temperature control and dry ice particle processing coupled system as described above, a pressure control assembly is arranged in the first storage tank, the pressure control assembly comprises a pressure sensor, the pressure sensor and the electromagnetic valve in the third storage tank are individually connected to a pressure controller to control the pressure of the heat exchange medium in the first storage tank.

[0027] The second aspect of the present application also provides a CO2 gas temperature control and dry ice particle processing coupled system, which is applied to cutting processing, and the outlet of the working cavity sprays dry ice particles towards the workpiece surface.

[0028] The third aspect of the present application also provides a working method of a CO2 gas temperature control and dry ice particle processing coupled system, which comprises the following contents:

[0029] The dry ice enters the gas pipeline, and the dry ice is broken multiple times by the gas pipeline and the dry ice breaking piece when flowing through the gas pipeline.

[0030] When the temperature of the first gas chamber needs to be adjusted, the heat exchange medium in the first storage tank enters the first gas chamber.

[0031] When the temperature in the first gas chamber is higher than the set value, the adjacent two gas chambers can be communicated.

[0032] When the heat exchange medium completes heat exchange, the heat exchange medium can enter the second storage tank for temporary storage and return to the first storage tank after a set time.

[0033] The beneficial effects of the present application are as follows:

[0034] 1) The dry ice particle processing unit in the present application comprises a gas pipeline, which is arranged in the gas chamber. The heat exchange medium can be introduced into each gas chamber. After the heat exchange medium is introduced into the gas chamber of the working cavity, the heat exchange medium can exchange heat with the CO2 in the gas pipeline. After the temperature of the heat exchange medium is increased, the heat exchange medium can be temporarily stored in the second storage tank. In this way, the temperature of the carbon dioxide gas in the working cavity is adjusted. The gas pipeline is arranged in a bent manner, and the dry ice breaking piece is arranged in the gas pipeline. In this way, the temperature of the CO2 gas is controlled, and the dry ice is effectively broken to ensure the processing quality of the workpiece surface, which is completely suitable for the CMQL low-temperature processing system.

[0035] 2) The dry ice breaking piece in the present application comprises a rotating grid, which comprises a plurality of blades. The rotating shaft can drive the blades to rotate. In this way, the dry ice particles in the CO2 gas can be effectively crushed when the dry ice particles flow through the rotating grid, which ensures the fineness of the dry ice particles at the outlet of the CO2 gas and effectively ensures the processing quality of the workpiece surface. In addition, the gas pipeline is designed in a winding manner, which can increase the heat exchange efficiency, save space, and achieve the impact breaking effect of the dry ice particles by using the winding section.

[0036] 3) The first electromagnetic valve is arranged between the two adjacent gas chambers in the application, the second electromagnetic valve is arranged between the gas chamber and the second storage tank, the first temperature sensor is arranged in the gas chamber, and the controller in each gas chamber can control the opening of the first electromagnetic valve and the second electromagnetic valve according to the temperature information of the gas chamber collected by the first temperature sensor, reasonably control the use number of the gas chamber, and when the temperature of the heat exchange medium in the gas chamber is too high, the heat exchange medium is introduced into the second storage tank.

[0037] 4) The pressure control assembly is arranged in the first storage tank in the application, the pressure of the heat exchange medium in the first storage tank can be controlled through the pressure control assembly, so as to avoid that the pressure in the first storage tank is too large; the temperature control assembly is arranged in the third storage tank, and the heat exchange medium can be heat exchanged when the temperature of the heat exchange medium in the third storage tank is too high, so as to control the temperature of the heat exchange medium entering the first storage tank. BRIEF DESCRIPTION OF DRAWINGS

[0038] The drawings accompanying the specification of the application form a part of the application and serve to further understand the application. The schematic embodiments of the application and the description thereof are used to explain the application, and do not constitute an improper limitation on the application.

[0039] Figure 1 is a schematic view of a CO2 gas temperature control and dry ice particle processing coupled system application environment according to one or more embodiments of the application.

[0040] Figure 2 is a schematic view of a CO2 gas temperature control and dry ice particle processing coupled system according to one or more embodiments of the application.

[0041] Figure 3 is a schematic view of a CO2 gas temperature control and dry ice particle processing coupled system according to one or more embodiments of the application.

[0042] Figure 4 is a front view of a CO2 gas temperature control and dry ice particle processing coupled system according to one or more embodiments of the application.

[0043] Figure 5 is a schematic view of a CO2 gas temperature control and dry ice particle processing coupled system according to one or more embodiments of the application.

[0044] Figure 6 is a schematic view of a CO2 gas temperature control and dry ice particle processing coupled system according to one or more embodiments of the application.

[0045] Figure 7is a top view of a rotating grid in a CO2 gas temperature control and dry ice particle processing coupled system according to one or more embodiments of the present application.

[0046] Figure 8 is a structural schematic diagram of a solenoid valve in a CO2 gas temperature control and dry ice particle processing coupled system according to one or more embodiments of the present application.

[0047] Figure 9 is a flow chart of a working method of a CO2 gas temperature control and dry ice particle processing coupled system according to one or more embodiments of the present application.

[0048] In the drawings: the mutual distance or size is exaggerated to show the position of each part, and the schematic diagram is only illustrative.

[0049] Wherein: 1-working cavity; 2-gas pipeline; 3-heat exchange medium inlet; 4-heat exchange medium outlet; 5-first solenoid valve; 6-second solenoid valve; 7-first connecting pipe; 8-second connecting pipe; 9-first storage tank; 10-second storage tank; 11-third connecting pipe; 12-third storage tank; 13-fourth connecting pipe; 14-temperature sensor; 15-rotating grid; 16-connecting rod; 17-CO2 bottle; 18-nozzle; 19-cutter; 20-micro lubrication device; 21-workpiece; 22-stator core; 23-spring; 24-coil; 25-mover core; 26-valve core; 27-valve seat; 28-third solenoid valve; 29-fourth solenoid valve; 30-temperature control assembly; 31-pressure control assembly; 32-regulating valve; 33-vane; 34-sleeve ring; 35-through hole. DETAILED DESCRIPTION

[0050] It should be noted that the following detailed description is illustrative only, and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0051] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments consistent with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0052] As introduced in the background, the problem of inconvenient control of CO2 gas temperature in low-temperature processing in the prior art, in order to solve the above technical problems, the present application provides a CO2 gas temperature control and dry ice particle processing coupled system.

[0053] Embodiment one

[0054] In one typical embodiment of the present application, referring to Figure 2 、 Figure 3 , a CO2 gas temperature control and dry ice particle processing coupling system comprises:

[0055] The gas temperature control unit comprises a working cavity 1, the working cavity 1 comprises a plurality of gas chambers, and adjacent two gas chambers are connected or disconnected. One side of the working cavity 1 is connected with a first storage tank 9, the first storage tank 9 provides heat exchange medium to the working cavity 1, each gas chamber is connected with a second storage tank 10 to temporarily store the heat exchanged heat exchange medium, and the first storage tank 9 is connected with the second storage tank 10.

[0056] The dry ice particle processing unit comprises a gas pipeline 2 arranged in each gas chamber, each gas pipeline 2 is arranged in a corresponding gas chamber, and the gas pipelines 2 of adjacent two gas chambers are connected. The gas pipeline is used for passing low-temperature CO2, and the gas pipeline 2 is provided with a dry ice breaking piece.

[0057] Referring to Figure 2 , the gas temperature control unit comprises a working cavity 1, a first storage tank 9, a second storage tank 10 and a third storage tank 12. The working cavity 1 is connected with the first storage tank 9 and the second storage tank 10 respectively, the third storage tank 12 is arranged between the first storage tank 9 and the second storage tank 10, the second storage tank 10 is connected with each gas chamber in the working cavity 1, and the outer surface of the working cavity 1 is wrapped with a heat insulation layer. The material of the heat insulation layer is any one of aerogel and mineral wool;

[0058] It is easy to understand that the first storage tank 9 stores heat exchange medium, the heat exchange medium is oxygen or nitrogen, and the first storage tank is connected with the working cavity 1 through a gas inlet pipe;

[0059] Referring to Figure 3 , the working cavity 1 is divided into a plurality of groups of gas chambers, the gas pipeline 2 is arranged in each gas chamber, each gas pipeline 2 is connected after penetrating the side wall of the gas chamber, the gas pipeline 2 penetrates the side wall of one side of the working cavity 1 to form a CO2 gas inlet 3, the gas pipeline 2 in the last gas chamber penetrates the side wall of one side of the working cavity 1 to form a CO2 gas outlet 4, and the gas pipeline 2 in each group of gas chambers is in an inverted U shape.

[0060] The gas pipeline 2 is sealed with sealing rings at its connection to the walls of each gas chamber. The diameter of the gas pipeline is set between 30-50mm, and the interval between each bend in the gas pipeline 2 is set between 5-10cm. The gas pipeline 2 and its connecting pipes are made of stainless steel, which has the advantages of impact resistance, non-deformation, good sealing performance, and long service life, and can meet the heat conduction requirements. The inner wall of the gas pipeline 2 has a polytetrafluoroethylene (PTFE) coating to prevent the gas pipeline from being blocked by dry ice particles.

[0061] refer to Figure 4 As shown, a first solenoid valve 5 is provided between two adjacent gas chambers, and a second solenoid valve 6 is installed at the top of the inside of the gas chamber. Several sets of second solenoid valves 6 are all connected to a first connecting pipe 7. The other end of the first connecting pipe 7 is connected to a second connecting pipe 8. The other end of the second connecting pipe 8 is connected to a second storage tank 10. The end of the second storage tank 10 away from the second connecting pipe 8 is connected to a third storage tank 12 through a third connecting pipe 11. The other end of the third storage tank 12 is connected to the first storage tank 9 through a fourth connecting pipe 13.

[0062] refer to Figure 5 , Figure 6 As shown, a rotating grid 15 is installed on the longer side of each gas pipeline 2. The rotating grid 15 is fixed inside the gas pipeline 2 by a connecting rod 16. The two ends of the connecting rod 16 are connected to the gas pipeline 2 by a threaded structure. During installation, a conical sealing screw is used for sealing. The sealing screw is a fine-threaded conical screw. When sealing, sealant is applied to the thread.

[0063] Specifically, the rotating grid 15 includes a rotating shaft, one end of which is connected to a rotating power source such as a micro motor. The micro motor is located inside a collar 34, which is connected to a connecting rod 16. The other end of the rotating shaft is connected to multiple blades 33 respectively. The speed of the rotating shaft can be adjusted according to the size and quantity of dry ice particles to achieve effective crushing of dry ice particles. The micro motor is connected to a control unit.

[0064] refer to Figure 7 As shown, each blade 33 has several through holes 35. The cross-section of the through holes 35 is circular. The through holes 35 are arranged along the thickness direction of the blade 33. The through holes 35 effectively reduce the impact on the gas pressure in the gas pipeline 2. Since the gas pipeline 2 is arranged in an inverted U-shape, the dry ice particles impact the inner wall end face of the gas pipeline and the blades of the rotating grid 14 during the process of passing through the gas pipeline 2, thereby achieving multiple crushing of the dry ice particles.

[0065] refer to Figure 4As shown, the first storage tank 9 is provided with a pressure control assembly 31, which includes a pressure sensor, the pressure sensor and the fourth electromagnetic valve 29 are respectively connected with a pressure controller, the pressure controller is an existing pressure controller, which is used to control the pressure of the heat exchange medium in the first storage tank 9, and the pressure is kept at 0.3-0.5 MPa.

[0066] The first storage tank 9 stores heat exchange medium, which is oxygen or nitrogen, and is communicated with the working cavity 1 through a gas inlet pipe, which is provided with an adjusting valve 32, which is used to deliver the heat exchange medium into the working cavity 1 to heat or cool the CO2 gas, and the adjusting range of the adjusting valve 32 is 0-0.2 MPa.

[0067] It can be understood that the second storage tank 10 is provided with a third electromagnetic valve 28 for controlling the on-off of the low-temperature medium.

[0068] In addition, the third storage tank 12 is provided with a temperature control assembly 30 and a fourth electromagnetic valve 29, the temperature control assembly includes a second temperature sensor, a temperature controller and a heat exchanger, the temperature controller is an existing temperature controller, and the temperature adjustment range of the temperature controller is 0℃ to-60℃, the second temperature sensor obtains the temperature information in the third storage tank 12 and sends it to the temperature controller, the temperature controller controls the opening or closing of the heat exchanger and the fourth electromagnetic valve 29 according to the temperature of the heat exchange medium in the third storage tank 12, the heat exchanger is an existing commonly used heat exchanger, which is arranged outside the third storage tank 12, when the temperature of the heat exchange medium in the third storage tank 12 is too high, the heat exchanger is opened to exchange heat and reduce the temperature of the heat exchange medium, when the temperature in the third storage tank 12 is reduced to the set temperature, the fourth electromagnetic valve 29 is opened by the temperature controller, so that the temperature of the heat exchange medium is adjusted according to the actual situation and the flow direction of the heat exchange medium is controlled into the first storage tank 9.

[0069] In addition, a first temperature sensor 14 is installed in each gas chamber, the first temperature sensor 14 is connected with a controller, and the first temperature sensor 14 is specifically installed on the gas pipeline 2, which is used to obtain the gas temperature information in each gas chamber and send it to the corresponding controller, the controller is connected with the first electromagnetic valve 5 and the second electromagnetic valve 6 respectively, and the controller is a PLC controller or other type of controller.

[0070] It should be noted that the adjusting valve 32 and the third electromagnetic valve 28 are respectively connected with a control unit, the control unit is connected with the pressure control assembly, the controller and the temperature control assembly respectively, so as to control the working opening of the pressure control assembly, the controller and the temperature control assembly, and the control unit is a PLC controller or other type of controller, which controls the adjusting valve 32 and the third electromagnetic valve 28.

[0071] It is easy to understand that the first electromagnetic valve, the second electromagnetic valve and the inner wall of the working cavity are connected by threads, and the third electromagnetic valve and the inner wall of the corresponding storage tank are connected by threads. When installing, use a tapered sealing screw to seal. The sealing screw is a fine threaded tapered screw. When sealing, apply sealant to the threads, and install a sealing gasket.

[0072] Reference Figure 8 As shown, the structure of each electromagnetic valve is the same. Each electromagnetic valve includes a valve seat 27 and a valve core 26. The valve seat supports a coil 24. A moving iron core 25 is arranged in the coil 24. The moving iron core 25 is connected to a fixed iron core 22 through a spring 23. The moving iron core 25 is connected to the valve core 26. When the electromagnetic valve is powered on, the valve core 26 moves relative to the valve seat 27, so that the flow passage of the heat exchange medium is opened. At this time, the heat exchange medium can flow.

[0073] The system provided by the embodiment includes a gas pipeline 2 arranged in the gas chamber. Each gas chamber can be connected to the heat exchange medium. After the heat exchange medium is connected to the gas chamber of the working cavity, the heat exchange medium can exchange heat with the dry ice in the gas pipeline. After the temperature of the heat exchange medium rises, the heat exchange medium can be temporarily stored in the second storage tank. In this way, the temperature of the carbon dioxide gas in the working cavity is adjusted. The gas pipeline is bent, and the dry ice breaking piece is arranged in the gas pipeline. In this way, the temperature of the CO2 gas is controlled, and the dry ice is effectively broken to ensure the machining quality of the workpiece surface, which is completely suitable for the CMQL low-temperature machining system.

[0074] Embodiment two

[0075] The embodiment provides an application of a CO2 gas temperature control and dry ice particle processing coupled system. The application is applied to cutting machining. As shown in Figure 1 The CO2 gas outlet in the working cavity is connected to a nozzle 18. The nozzle 18 sprays dry ice particles and lubricating oil towards the surface of a workpiece 21. The CO2 gas inlet is connected to a CO2 bottle 17. The surface of the workpiece is machined by a cutter 19. The nozzle 18 is also connected to a micro-lubrication device 20 to supply lubricating oil to the nozzle. In this way, according to the temperature requirement of the CO2 gas provided to the nozzle, the opening or closing of the adjusting valve and the third electromagnetic valve is controlled by the control unit. The first electromagnetic valve and the second electromagnetic valve are controlled by the controllers. The fourth electromagnetic valve is controlled by the pressure control assembly. The fourth electromagnetic valve is controlled by the temperature control assembly.

[0076] Embodiment three

[0077] The embodiment provides a working method of a CO2 gas temperature control and dry ice particle processing coupled system. As shown in Figure 9 The working method includes the following contents.

[0078] The dry ice enters the gas pipeline, and the dry ice is broken by the gas pipeline and the dry ice breaking piece for multiple times when the dry ice flows through the gas pipeline;

[0079] When the target gas needs to be temperature-regulated, the control unit controls the heat exchange medium to enter the working cavity 1 by adjusting the opening and closing of the valve 32, and also plays a role of regulating the flow of the heat exchange medium. When the heat exchange medium enters the leftmost gas chamber of the working cavity 1, the first temperature sensor 14 monitors the temperature of the gas in each gas chamber. The controller controls the opening or closing of the first electromagnetic valve 5 to control the number of opened gas chambers.

[0080] When the heat exchange medium completes heat exchange through the working cavity 1, it enters the second storage tank 10 through the first connecting pipe 7 and the second connecting pipe 8. The second storage tank 10 temporarily stores the heat-exchanged heat exchange medium, and then enters the third storage tank 12 through the third connecting pipe 11.

[0081] The third storage tank 12 is provided with a temperature control assembly 30. The temperature control assembly controls the opening or closing of the fourth electromagnetic valve according to the temperature in the third storage tank 12. When the temperature of the heat exchange medium in the third storage tank 12 decreases to a set temperature, the heat exchange medium returns to the first storage tank 9 again, realizing the recycling of the heat exchange medium and saving resources.

[0082] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A CO2 gas temperature control and dry ice particle processing coupled system, comprising: a CO2 gas temperature control system; a dry ice particle processing system; and a coupling system configured to couple the CO2 gas temperature control system and the dry ice particle processing system. The application relates to a gas temperature control unit, a dry ice particle processing unit, a pressure control component and a temperature control component. The gas temperature control unit comprises a working cavity, the working cavity comprises a plurality of gas chambers, adjacent two gas chambers are in communication or disconnected, one side of the working cavity is in communication with a first storage tank, the first storage tank provides heat exchange medium to the working cavity, each gas chamber is in communication with a second storage tank to temporarily store the heat exchange medium after heat exchange, the first storage tank is in communication with the second storage tank; The dry ice particle processing unit comprises a gas pipeline arranged in each gas chamber, each gas pipeline is arranged in the corresponding gas chamber in a bent mode, the gas pipelines of adjacent two gas chambers are in communication, the gas pipeline is used for passing low-temperature CO2, and a dry ice crushing piece is arranged in the gas pipeline. The dry ice crushing piece comprises a rotating grid arranged in the gas pipeline, the rotating grid is supported in the gas pipeline through a connecting rod, the rotating grid comprises a rotating shaft, one end of the rotating shaft is connected with a rotating power source, and the other end of the rotating shaft is connected with a plurality of blades. The blade has a set thickness, a plurality of through holes are arranged on the blade along the thickness direction of the blade. The volume of the gas chamber in the working cavity gradually increases from one side of the working cavity in communication with the first storage tank to the other side of the working cavity. The gas pipeline is arranged in an inverted U-shaped mode, the height of the gas pipeline is smaller than the height of the gas chamber. One gas pipeline passes through the side wall of the working cavity to form a CO2 gas inlet, and the other gas pipeline passes through the side wall of the working cavity to form a CO2 gas outlet. A first electromagnetic valve is arranged between adjacent two gas chambers to control the opening number of the gas chamber, and a second electromagnetic valve in communication with the second storage tank is arranged in each gas chamber.

2. The CO2 gas temperature control and dry ice particle processing coupled system of claim 1, wherein, A first temperature sensor is arranged in each gas chamber, and the corresponding first temperature sensor, the first electromagnetic valve and the second electromagnetic valve in each gas chamber are separately connected with a controller, when the gas temperature in the gas chamber reaches a set value, the controller controls the first electromagnetic valve to be opened to increase the number of the gas chamber and / or controls the second electromagnetic valve to be opened to discharge the heat-exchanged heat exchange medium into the second storage tank.

3. The CO2 gas temperature control and dry ice particle processing coupled system of claim 1, wherein, A third storage tank is connected between the first storage tank and the second storage tank, electromagnetic valves are arranged in the second storage tank and the third storage tank, and an adjusting valve is arranged between the first storage tank and the working cavity, the adjusting valve and the electromagnetic valves in the second storage tank are separately connected with a control unit. A temperature control component is arranged in the third storage tank, the temperature control component comprises a second temperature sensor, a temperature controller and a heat exchanger, and the heat exchanger, the second temperature sensor and the electromagnetic valve in the third storage tank are connected with the temperature controller to control the temperature of the heat exchange medium entering the first storage tank.

4. The CO2 gas temperature control and dry ice particle processing coupled system of claim 3, wherein, A pressure control component is arranged in the first storage tank, the pressure control component comprises a pressure sensor, and the pressure sensor and the electromagnetic valve in the third storage tank are separately connected with a pressure controller to control the pressure of the heat exchange medium in the first storage tank.

5. The method of operating a CO2 gas temperature control and dry ice particle treatment coupled system of any of claims 1-4, wherein, The application further discloses a working method of the gas temperature control unit, the dry ice particle processing unit, the pressure control component and the temperature control component. The dry ice enters the gas pipeline, and the gas pipeline is arranged in a bent mode, so that the gas pipeline and the dry ice crushing piece crush the dry ice particles for multiple times when the dry ice flows through the gas pipeline; When temperature adjustment of the first gas chamber is needed, the heat exchange medium in the first storage tank enters the first gas chamber. When the temperature in the first chamber is higher than the set value, the two adjacent chambers are communicated; When the heat exchange medium completes heat exchange, the heat exchange medium can enter the second storage tank for temporary storage, and return to the first storage tank after a set time.

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