Automobile workpiece die-casting die

Abstract

The invention relates to the technical field of automobile non-ferrous metal casting, and discloses an automobile workpiece die-casting die which comprises a movable die body and a fixed die body, the movable die body and the fixed die body are combined together to form a die cavity so as to cast automobile non-ferrous metal workpieces, and a connecting frame is arranged on the surface of the side, away from the movable die body, of the fixed die body. The mold cavity heating assembly is arranged on the connecting frame, penetrates through and extends into the fixed mold, and is used for inputting high-temperature steam into the mold cavity so as to preheat the interior of the mold cavity; the water vapor extraction assembly is arranged on the connecting frame, penetrates through and extends into the fixed mold, and the water vapor extraction assembly communicates with the mold cavity heating assembly. The automobile workpiece die-casting die aims at solving the problems that in existing automobile non-ferrous metal workpiece die-casting production, a die preheating assembly and a release agent spraying assembly are independently arranged, so that die-casting equipment is large in occupied area, and the site use cost is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of non-ferrous metal casting for automobiles, and particularly to a die-casting mold for automobile workpieces. Background Art

[0002] Non-ferrous metals on automobiles are often cast from aluminum alloy or magnesium alloy. Among them, cylinder blocks, cylinder heads, pistons, transmission housings or differential housings are all cast from non-ferrous metals. Among them, the most obvious difference between die-casting of non-ferrous metals and ordinary metal die-casting is that non-ferrous metals have a higher temperature. In order to ensure the quality of die-casting, a special die-casting mold for non-ferrous metal workpieces of automobiles needs to be used.

[0003] In the die-casting production of non-ferrous metal workpieces of automobiles, in the prior art, a mold preheating component and a release agent spraying component are arranged beside the die-casting mold for supporting use. From the perspective of space occupation, the preheating component and the release agent spraying component are independently arranged, and a large travel space needs to be reserved to complete the preheating and spraying actions. This greatly increases the floor area of the entire die-casting equipment. The overly large floor area of the equipment not only increases the cost of site use, but also restricts the layout planning of the production line, hinders the improvement of the production efficiency of the workshop and the expansion of production capacity. At the level of production efficiency, due to the need for precise control of the cooperation between the preheating component and the release agent spraying component and the die-casting mold, the scattered layout makes it difficult to ensure the coordination between the two. For example, if the time for spraying the release agent is slightly delayed after the mold is preheated, it may cause the mold temperature to drop and affect the die-casting quality; conversely, if spraying is too early and the release agent stays on the mold for too long, it may also affect the demolding effect. This difficulty in cooperation increases the uncertainty in the production process and reduces the stability of production efficiency and product quality. Summary of the Invention

[0004] The purpose of the present invention is to solve the problem that in the die-casting production of non-ferrous metal workpieces of automobiles, the independent setting of the mold preheating component and the release agent spraying component leads to a large floor area of the die-casting equipment and an increase in the cost of site use, and to propose a die-casting mold for automobile workpieces.

[0005] The technical solution of the present invention for solving the above technical problems is as follows:

[0006] A die-casting mold for automobile workpieces includes a moving mold and a fixed mold. The moving mold and the fixed mold are combined to form a mold cavity for casting non-ferrous metal workpieces of automobiles. A connecting frame is provided on the surface of the fixed mold away from the moving mold. The die-casting mold further includes:

[0007] A mold cavity heating component is arranged on the connecting frame and penetrates and extends into the fixed mold. The mold cavity heating component is used to input high-temperature steam into the mold cavity to preheat the inside of the mold cavity;

[0008] A steam extraction component is arranged on the connecting frame, penetrates and extends into the fixed mold, and is in mutual communication with the mold cavity heating component. The steam extraction component is used to extract the steam in the mold cavity and transport it into the mold cavity heating component to prevent the oxidation of non-ferrous metal liquid for automobiles and recover heat to preheat the mold cavity heating component;

[0009] A mold release agent spraying component is arranged on the connecting frame, penetrates and extends into the fixed mold, and the mold release agent spraying component is used to spray the mold release agent into the high-temperature mold cavity;

[0010] An air and volatile matter extraction component is arranged on the connecting frame, penetrates and extends into the fixed mold, and is used to extract the bubbles, air films and volatiles formed by the mold release agent in the mold cavity to keep the mold cavity clean.

[0011] On the basis of the above technical solutions, the present invention can also be improved as follows.

[0012] Furthermore, the mold cavity heating component includes:

[0013] A first installation base is fixedly installed on the side surface of the connecting frame;

[0014] A heating tank is fixedly installed on the surface of the first installation base, and water is filled in the heating tank;

[0015] An electric heating wire is arranged inside the heating tank, and the electric heating wire is used to heat the water in the heating tank to form high-temperature steam;

[0016] A steam delivery pipe, one end of which is in mutual communication with the heating tank, and the other end is communicated with an output component. The output end of the output component penetrates the fixed mold and extends to the inside of the fixed mold.

[0017] Furthermore, the output component includes:

[0018] An installation base rod penetrates the fixed mold and extends to the inside of the fixed mold. An installation cavity is formed inside the installation base rod, and the end of the steam delivery pipe far from the heating tank penetrates the installation base rod and extends into the installation cavity;

[0019] An output chamber is fixedly installed in the installation cavity of the installation base rod. An equalizing chamber is arranged in the output chamber. The end of the steam delivery pipe far from the heating tank is in mutual communication with the output chamber. The steam delivery pipe is used to transport high-temperature steam into the equalizing chamber of the output chamber;

[0020] A main pipe, one end of which is in mutual communication with the equalizing chamber of the output chamber, and the other end is closed;

[0021] A branch pipe, one end of which is interconnected with the main pipe, and the other end is connected with a spray head extending outside the installation base rod. The number of the branch pipes is several and they are annularly and equidistantly distributed around the axis of the main pipe. The number and distribution positions of the spray heads are adapted to the branch pipes.

[0022] Furthermore, the water vapor extraction assembly includes:

[0023] An extraction pipe, which is penetratively arranged on the connecting frame and one end of which extends to the inside of the fixed mold;

[0024] A first extraction pipe, one end of which is interconnected with the end of the extraction pipe away from the moving mold;

[0025] A steam buffer tank, which is fixedly installed on the surface of the connecting frame away from the fixed mold. The other end of the first extraction pipe is interconnected with the steam buffer tank;

[0026] A first vacuum pump, which is fixedly installed on the surface of the first installation base. Its extraction end is connected with a first annular extraction pipe interconnected with the steam buffer tank, and its conveying end is connected with the discharge pipe of the heating tank.

[0027] Furthermore, the number of the extraction pipes is not less than four and they are annularly and equidistantly distributed around the center of the fixed mold. The number and distribution positions of the first extraction pipes and the steam buffer tank are adapted to the extraction pipes. A second solenoid valve is also provided on the first extraction pipe, and a check valve is also provided on the discharge pipe. The extraction pipe is a pipe body with both ends closed. A number of extraction holes are formed on the outer wall of the extraction pipe and are annularly and equidistantly distributed. The extraction pipe is interconnected with the mold cavity through the extraction holes.

[0028] Furthermore, a driving member interlocked with the installation base rod and the extraction pipe is also provided on the surface of the connecting frame away from the fixed mold. The driving member is used to drive the installation base rod to move on the fixed mold to output steam and drive the extraction pipe to synchronously displace on the fixed mold to extract gaseous impurities into the mold cavity, and also to eject the automotive non-ferrous metal workpiece in the mold cavity by the installation base rod and the extraction pipe.

[0029] Furthermore, the driving member includes:

[0030] A connecting seat, which is fixedly installed on the outside of the installation base rod and is integrally provided with the installation base rod;

[0031] A connecting rod, one end of which is fixedly installed on the outside of the connecting seat, and the other end is fixedly connected with the extraction pipe. The number and distribution positions of the connecting rods are adapted to the extraction pipes one by one;

[0032] An electric push rod, which is fixedly installed on the surface of the connecting frame away from the fixed mold. The output end of the electric push rod faces away from the connecting frame;

[0033] The moving plate is fixedly installed on the output end of the electric push rod and can move synchronously with the displacement of the output end of the electric push rod;

[0034] The linkage plate has one end fixedly installed on one side surface of the moving plate and the other end fixedly installed on the surface of the connecting rod.

[0035] Furthermore, the mold release agent spraying assembly includes:

[0036] The mold release agent storage tank is fixedly installed on the surface of the connecting frame, and a high-temperature wax-based mold release agent is stored in the mold release agent storage tank;

[0037] The pump body is fixedly installed outside the mold release agent storage tank, and its suction end penetrates and extends to the inside of the mold release agent storage tank;

[0038] One end of the mold release agent output pipe is communicated with the output end of the pump body, and the other end is communicated with the output chamber.

[0039] Furthermore, the air and volatile extraction assembly includes:

[0040] The second suction pipe has one end communicated with the extraction pipe, and its quantity and distribution position are adapted to those of the extraction pipe;

[0041] The adsorption tank is fixedly installed on the surface of the connecting frame on the side away from the fixed mold, and the other end of the second suction pipe is communicated with the adsorption tank;

[0042] The second annular extraction pipe is fixedly installed outside the adsorption tank and is communicated with the adsorption tank;

[0043] The second vacuum pump is fixedly installed on the surface of the connecting frame on the side away from the fixed mold, and the suction end of the second vacuum pump is communicated with the second annular extraction pipe.

[0044] Furthermore, a third solenoid valve is provided on the second suction pipe, and an adsorption and collection member is provided in the adsorption tank, and the adsorption and collection member is one or a combination of activated carbon adsorbent, molecular sieve or filter membrane.

[0045] Compared with the prior art, the technical solution of the present application has the following beneficial technical effects:

[0046] In the present invention, the mold cavity heating component, the water vapor extraction component, the mold release agent spraying component, and the air and volatile extraction component are all arranged on the connecting frame on the fixed mold side, and each component penetrates and extends into the fixed mold. Compared with the prior art where the preheating component and the mold release agent spraying component are independently arranged, the reserved travel space required by the equipment is significantly reduced, thereby reducing the floor area of the entire die-casting equipment, lowering the site usage cost, providing greater flexibility for the production line layout planning, being beneficial to the improvement of the workshop production efficiency and the expansion of production capacity. In terms of improving the production efficiency and the stability of product quality, the mold cavity heating component can input high-temperature steam into the mold cavity for preheating, and the water vapor extraction component can timely transport the water vapor in the mold cavity into the mold cavity heating component to realize heat recovery for preheating, which not only prevents the oxidation of automotive non-ferrous metal liquid but also ensures the stability of the mold cavity temperature. The mold release agent spraying component sprays the mold release agent into the high-temperature mold cavity at an appropriate time, and at the same time, the air and volatile extraction component extracts the bubbles, air films, and volatiles formed by the mold release agent in the mold cavity to keep the mold cavity clean. Each component cooperates closely, avoiding problems such as the decrease in mold temperature and poor demolding effect caused by improper timing of preheating and spraying, effectively enhancing the coordination between components, reducing the uncertainty in the production process, and thus significantly improving the production efficiency and the stability of product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 is a schematic diagram of the overall connection structure of the present invention;

[0048] Figure 2 is a schematic diagram of the connection structure of the present invention from another perspective;

[0049] Figure 3 is a schematic diagram of the connection structure of the output component of the present invention;

[0050] Figure 4 is a schematic diagram of the connection structure between the heating tank and the heating wire of the present invention;

[0051] Figure 5 is a schematic diagram of the connection structure between the fixed mold and the extraction pipe and the installation base rod of the present invention;

[0052] Figure 6 is a schematic diagram of the connection structure between the connecting frame and the driving component of the present invention;

[0053] Figure 7 is a schematic diagram of the connection structure between the extraction pipe and the first extraction pipe of the present invention;

[0054] Figure 8 is a schematic diagram of the connection structure between the extraction pipe and the extraction hole of the present invention;

[0055] Figure 9 is a schematic diagram of the connection structure between the adsorption tank and the adsorption collection part of the present invention.

[0056] In the figure: 1, moving die; 2, fixed die; 3, connecting frame; 4, cavity heating assembly; 41, first mounting base; 42, heating tank; 43, heating wire; 44, steam delivery pipe; 45, output member; 451, mounting base rod; 452, output chamber; 453, main pipe; 454, branch pipe; 455, nozzle; 5, water vapor extraction assembly; 51, extraction pipe; 52, first extraction pipe; 53, steam buffer tank; 54, first vacuum pump; 55, first annular extraction pipe; 56, discharge pipe; 6, mold release agent spraying assembly; 61, mold release agent storage tank; 62, pump body; 63, mold release agent output pipe; 7, air and volatile matter extraction assembly; 71, second extraction pipe; 72, adsorption tank; 73, second annular extraction pipe; 74, second vacuum pump; 8, second solenoid valve; 9, check valve; 10, extraction hole; 11, driving member; 111, connecting seat; 112, connecting rod; 113, electric push rod; 114, moving plate; 115, linkage plate; 12, third solenoid valve; 13, adsorption collection member. Detailed implementation mode

[0057] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0058] Combined with Figures 1-9 As shown, a die-casting mold for automobile workpieces of the present invention includes a moving die 1 and a fixed die 2. The moving die 1 and the fixed die 2 are combined to form a cavity for casting non-ferrous metal workpieces of automobiles. A connecting frame 3 is provided on the surface of the fixed die 2 away from the moving die 1. It further includes:

[0059] A cavity heating assembly 4 is arranged on the connecting frame 3 and penetrates and extends into the fixed die 2. The cavity heating assembly 4 is used to input high-temperature steam into the cavity to preheat the inside of the cavity.

[0060] A water vapor extraction assembly 5 is arranged on the connecting frame 3 and penetrates and extends into the fixed die 2. The water vapor extraction assembly 5 is interconnected with the cavity heating assembly 4. The water vapor extraction assembly 5 is used to extract the water vapor in the cavity and transport it into the cavity heating assembly 4 to prevent the oxidation of non-ferrous metal liquid of automobiles and recycle heat to preheat the cavity heating assembly 4.

[0061] A mold release agent spraying assembly 6 is arranged on the connecting frame 3 and penetrates and extends into the fixed die 2. The mold release agent spraying assembly 6 is used to spray mold release agent into the high-temperature cavity.

[0062] The air and volatile extraction component 7 is arranged on the connecting frame 3, penetrates and extends into the fixed mold 2, and is used to extract the bubbles, air films and volatiles formed by the release agent in the mold cavity to keep the mold cavity clean.

[0063] The mold cavity heating component 4 is arranged on the connecting frame 3 and penetrates the fixed mold 2. By inputting high-temperature steam into the mold cavity, it preheats the inside of the mold cavity by using the heat of the steam, so that the mold cavity reaches an appropriate temperature, creating good temperature conditions for the casting of automotive non-ferrous metal workpieces, and avoiding problems such as poor fluidity of the molten metal and casting defects caused by too low temperature of the mold cavity. After the preheating is completed, the water vapor extraction component 5 comes into play. Since it is interconnected with the mold cavity heating component 4 and is also arranged on the connecting frame 3 and penetrates the fixed mold 2, this component can extract the residual water vapor in the mold cavity and transport it into the mold cavity heating component 4. On the one hand, extracting the water vapor can prevent the automotive non-ferrous metal liquid from reacting with the water vapor during casting and oxidizing, ensuring the quality of the casting; on the other hand, transporting the water vapor to the mold cavity heating component 4 can recover the heat of the steam therein and be used to preheat the mold cavity heating component 4 itself, improving the energy utilization efficiency and reducing energy consumption. Then, the release agent spraying component 6 starts to work. It is installed on the connecting frame 3 and penetrates the fixed mold 2 and extends into the mold cavity. After the mold cavity is preheated and the water vapor is extracted, this component sprays the release agent into the high-temperature mold cavity to form an isolation layer on the surface of the mold cavity, so that the workpiece can be smoothly demolded after die casting, improving the demolding efficiency and ensuring the surface quality of the workpiece. Finally, the air and volatile extraction component 7 is arranged on the connecting frame 3 and penetrates the fixed mold 2. After the release agent is sprayed, this component extracts the bubbles, air films and volatiles formed by the release agent in the mold cavity. If these bubbles, air films and volatiles remain in the mold cavity, they will affect the uniform adhesion and effect of the release agent, and may also cause defects on the surface of the casting. By extracting these substances, the cleanliness of the mold cavity can be maintained, ensuring the smooth progress of the die casting process and improving the die casting quality of automotive non-ferrous metal workpieces.

[0064] In a preferred embodiment of the present invention, it can be further configured as: as Figure 1 、 Figure 2 and Figure 4 shown; the mold cavity heating component 4 includes:

[0065] The first mounting base 41 is fixedly installed on the side surface of the connecting frame 3;

[0066] The heating tank 42 is fixedly installed on the surface of the first mounting base 41, and water is filled in the heating tank 42;

[0067] The electric heating wire 43 is arranged inside the heating tank 42, and the electric heating wire 43 is used to heat the water in the heating tank 42 to form high-temperature steam;

[0068] A steam delivery pipe 44, one end of which is in communication with the heating tank 42, and the other end is connected to an output member 45. The output end of the output member 45 penetrates through the fixed mold 2 and extends to the inside of the fixed mold 2. The first mounting base 41 provides a stable mounting foundation for the entire mold cavity heating assembly 4. The heating tank 42 fixedly installed thereon is filled with water as a medium for generating high-temperature steam. Then, the electric heating wire 43 provided inside the heating tank 42 starts to work, generates heat through the current, and heats the water in the heating tank 42. As the heating continues, the temperature of the water continuously rises until it boils and vaporizes into high-temperature steam. The generated high-temperature steam is transmitted through the steam delivery pipe 44. One end of the steam delivery pipe 44 is connected to the heating tank 42 to lead out the steam, and the other end is connected to the output member 45. The output end of the output member 45 penetrates through the fixed mold 2 and extends to its inside, so as to transport the high-temperature steam into the mold cavity. At the same time, a first electromagnetic valve is provided outside the steam delivery pipe 44, which can control the delivery of steam according to actual needs. When it is necessary to preheat the mold cavity, the first electromagnetic valve is opened, and the high-temperature steam enters the mold cavity along the steam delivery pipe 44 and through the output member 45. The heat of the steam is used to preheat the inside of the mold cavity to make the mold cavity reach a temperature suitable for casting automotive non-ferrous metal workpieces. When the preheating is completed, the first electromagnetic valve is closed to stop the steam delivery and avoid unnecessary waste of steam.

[0069] In a preferred embodiment of the present invention, it can be further configured as: as Figure 2 , Figure 3 shown; the output member 45 includes:

[0070] A mounting base rod 451, which penetrates through the fixed mold 2 and extends to the inside of the fixed mold 2. An installation cavity is provided inside the mounting base rod 451. One end of the steam delivery pipe 44 far from the heating tank 42 penetrates through the mounting base rod 451 and extends into the installation cavity;

[0071] An output chamber 452, which is fixedly installed in the installation cavity of the mounting base rod 451. An equalizing chamber is provided in the output chamber 452. One end of the steam delivery pipe 44 far from the heating tank 42 is in communication with the output chamber 452. The steam delivery pipe 44 is used to transport the high-temperature steam into the equalizing chamber of the output chamber 452;

[0072] A main pipe 453, one end of which is in communication with the equalizing chamber of the output chamber 452, and the other end is closed;

[0073] The branch pipe 454 has one end communicating with the main pipe 453 and the other end communicating with a spray head 455 extending outside the installation base rod 451. The number of branch pipes 454 is set to be several and is evenly distributed in a ring shape around the axis of the main pipe 453. The number and distribution positions of the spray heads 455 are adapted to the branch pipes 454. The installation base rod 451 penetrates through the fixed mold 2 and extends to its inner side. The installation cavity opened inside it provides an installation space for other components. At the same time, one end of the steam delivery pipe 44 far from the heating tank 42 penetrates through the installation base rod 451 and extends into the installation cavity to realize the connection with the output component 45, introducing the high-temperature steam generated from the heating tank 42 into the output component 45. After the high-temperature steam enters, it is delivered into the output chamber 452. The equalizing chamber in the output chamber 452 plays a role in initially distributing the steam. The steam delivery pipe 44 sends the high-temperature steam into the equalizing chamber, enabling the steam to be initially evenly distributed in the chamber and avoiding the steam concentrating at a certain place. Then, the main pipe 453 connected to the equalizing chamber of the output chamber 452 further guides the steam flow. One end of the main pipe 453 receives the steam from the equalizing chamber and the other end is closed, prompting the steam to flow towards the branch pipes 454 connected to the main pipe 453. The number of branch pipes 454 is several and is evenly distributed in a ring shape around the axis of the main pipe 453. This distribution method ensures that the steam can be evenly delivered from all directions. One end of each branch pipe 454 is connected to the main pipe 453 to receive the steam, and the other end is connected to the spray head 455 extending outside the installation base rod 451. The number and distribution positions of the spray heads 455 are adapted to the branch pipes 454. Finally, the high-temperature steam is evenly sprayed into the mold cavity through the spray heads 455, realizing the uniform preheating of the mold cavity and avoiding the local temperature of the mold cavity being too high or too low.

[0074] In a preferred embodiment of the present invention, it can be further configured as follows: as Figure 1 、 Figure 2 and Figure 6 shown; the water vapor extraction assembly 5 includes:

[0075] The extraction pipe 51 is disposed through the connecting frame 3 and one end thereof extends to the inner side of the fixed mold 2;

[0076] The first extraction pipe 52 has one end communicating with the end of the extraction pipe 51 far from the moving mold 1;

[0077] The steam buffer tank 53 is fixedly installed on the surface of the connecting frame 3 away from the fixed mold 2, and the other end of the first extraction pipe 52 communicates with the steam buffer tank 53;

[0078] The first vacuum pump 54 is fixedly installed on the surface of the first mounting base 41. Its extraction end is connected to a first annular extraction pipe 55 that communicates with the steam buffer tank 53. The delivery end of the first vacuum pump 54 is connected to a discharge pipe 56 that communicates with the heating tank 42. When it is necessary to extract the water vapor in the mold cavity, the water vapor extraction assembly 5 starts to work. The extraction pipe 51 passes through the connecting frame 3 and one end extends to the inside of the fixed mold 2. As a component directly communicating with the mold cavity, it provides a channel entrance for the extraction of water vapor. Under the action of the pressure difference, the water vapor in the mold cavity first enters the extraction pipe 51, and then is transported to the steam buffer tank 53 fixedly installed on the surface of the connecting frame 3 away from the fixed mold 2 through the first suction pipe 52 connected to the end of the extraction pipe 51 away from the moving mold 1. The steam buffer tank 53 plays a role in temporarily storing water vapor, balancing the flow rate and pressure of water vapor, and avoiding excessive pressure fluctuations during the transportation of water vapor. At this time, the first vacuum pump 54 fixedly installed on the surface of the first mounting base 41 is started. Its extraction end is connected to the steam buffer tank 53 through the first annular extraction pipe 55, and starts to extract the water vapor stored in the steam buffer tank 53. Under the action of the first vacuum pump 54, the water vapor is extracted from the steam buffer tank 53, passes through the delivery end of the first vacuum pump 54, and finally is transported to the heating tank 42 through the discharge pipe 56 connected to the heating tank 42. In this way, on the one hand, the water vapor in the mold cavity is extracted to prevent the oxidation of automotive non-ferrous metal liquid and ensure the casting quality of non-ferrous metal workpieces; on the other hand, the recovered water vapor re-enters the heating tank 42, and the heat it carries can preheat the heating tank 42, realizing the recycling of heat, improving the energy utilization efficiency, reducing the overall energy consumption, and at the same time providing a certain preheating basis for the generation of high-temperature steam next time, making the work of the mold cavity heating assembly 4 more efficient.

[0079] The present invention can be further configured in a preferred embodiment as follows: As Figure 1 、 Figure 2 and Figure 8As shown in the figure; the number of extraction pipes 51 is not less than four and is evenly distributed at equal intervals in a ring shape around the center of the fixed mold 2. The number and distribution positions of the first extraction pipes 52 and the steam buffer tank 53 are adapted to those of the extraction pipes 51. A second solenoid valve 8 is also provided on the first extraction pipe 52, and a check valve 9 is also provided on the discharge pipe 56. The extraction pipe 51 is a pipe body with both ends closed. A number of extraction holes 10 are provided on the outer wall of the extraction pipe 51 and are evenly distributed at equal intervals in a ring shape. The extraction pipe 51 is in communication with the mold cavity through the extraction holes 10. During the operation of the water vapor extraction assembly 5, multiple extraction pipes 51 are evenly distributed at equal intervals in a ring shape around the center of the fixed mold 2, and the number is not less than four. This layout can ensure the uniform extraction of water vapor from different positions of the mold cavity, avoiding the residual water vapor in some areas of the mold cavity due to a single extraction position. The extraction pipe 51 is a pipe body with both ends closed, and a number of extraction holes 10 evenly distributed at equal intervals in a ring shape are provided on its outer wall. The extraction holes 10 become the channels for the water vapor in the mold cavity to enter the extraction pipe 51. When the first vacuum pump 54 is started, a negative pressure is formed in the extraction pipe 51. Under the action of the pressure difference, the water vapor in the mold cavity is sucked into the extraction pipe 51 through the extraction holes 10, and finally the water vapor in the extraction pipe 51 is transported to the steam buffer tank 53. The second solenoid valve 8 provided on the first extraction pipe 52 can control the transportation of water vapor according to actual needs. When water vapor needs to be extracted, the second solenoid valve 8 is opened to allow the water vapor to flow through the first extraction pipe 52 to the steam buffer tank 53; when water vapor does not need to be extracted or the extraction is completed, the second solenoid valve 8 is closed to prevent steam from flowing back or external air from entering, ensuring the tightness and stability of the system. The steam buffer tank 53 is used to temporarily store the water vapor collected from each extraction pipe 51, playing a role of buffering and stabilizing the pressure, avoiding the influence of the water vapor flow rate fluctuation on the subsequent transportation process. The check valve 9 provided on the discharge pipe 56 can ensure that the water vapor can only flow from the first vacuum pump 54 to the heating tank 42, preventing the steam or other substances in the heating tank 42 from flowing back to the first vacuum pump 54.

[0080] In a preferred embodiment of the present invention, it can be further configured as: as Figure 6 , Figure 7As shown in the figure; on the surface of the connecting frame 3 away from the fixed mold 2, there is also a driving member 11 that is interlocked with the installation base rod 451 and the extraction pipe 51. The driving member 11 is used to drive the installation base rod 451 to move on the fixed mold 2 to output steam and drive the extraction pipe 51 to synchronously displace on the fixed mold 2 to extract gaseous impurities from the mold cavity. It also ejects the automotive non-ferrous metal workpiece in the mold cavity by means of the installation base rod 451 and the extraction pipe 51. The driving member 11 is installed on the surface of the connecting frame 3 away from the fixed mold 2 and forms an interlocking relationship with the installation base rod 451 and the extraction pipe 51, playing multiple roles throughout the die-casting process. When the mold cavity needs to be preheated, the driving member 11 is activated to drive the installation base rod 451 to move on the fixed mold 2, so that the nozzle 455 of the output member 45 is aligned with the appropriate position of the mold cavity. At this time, the high-temperature steam generated by the mold cavity heating assembly 4 enters the output chamber 452 through the steam delivery pipe 44 and is ejected from the nozzle 455 through the main pipe 453 and the branch pipe 454 to uniformly preheat the mold cavity. At the same time, the driving member 11 drives the extraction pipe 51 to synchronously displace on the fixed mold 2, and the extraction holes 10 on the outer wall of the extraction pipe 51 remain in communication with the mold cavity. If gaseous impurities are generated during the preheating process, the extraction pipe 51 can timely extract them under the action of the water vapor extraction assembly 5 to prevent the gaseous impurities from affecting the preheating effect and the subsequent die-casting quality. After the non-ferrous metal die-casting is completed, the driving member 11 acts again, and by controlling the installation base rod 451 and the extraction pipe 51 to move into the mold cavity, the ejection force generated by their displacement is used to eject the formed automotive non-ferrous metal workpiece in the mold cavity. This interlocking design enables the driving member 11 to accurately output high-temperature steam and effectively extract gaseous impurities from the mold cavity in one action process, and can also complete the ejection operation of the workpiece, simplifying the cooperation process of multiple independent actions and equipment in the traditional die-casting process and reducing the stroke space required for equipment operation.

[0081] In a preferred embodiment of the present invention, it can be further configured as: as Figure 2 , Figure 6 and Figure 7 shown; the driving member 11 includes:

[0082] A connecting seat 111, fixedly installed on the outside of the installation base rod 451, which is integrally provided with the installation base rod 451;

[0083] A connecting rod 112, one end of which is fixedly installed on the outside of the connecting seat 111, and the other end is fixedly connected to the extraction pipe 51. The number and distribution position of the connecting rod 112 are adapted to the extraction pipe 51 one by one;

[0084] An electric push rod 113, fixedly installed on the surface of the connecting frame 3 away from the fixed mold 2, and the output end of the electric push rod 113 faces away from the connecting frame 3;

[0085] The moving plate 114 is fixedly installed on the output end of the electric push rod 113, and it can move synchronously with the displacement of the output end of the electric push rod 113;

[0086] The linkage plate 115, one end of which is fixedly installed on one side surface of the moving plate 114, and the other end is fixedly installed on the surface of the connecting rod 112. During the preheating and gaseous impurity extraction stage, when it is necessary to preheat the mold cavity, the electric push rod 113 is started, and its output end extends towards the side of the fixed mold 2, driving the moving plate 114 fixedly connected thereto to move synchronously. The movement of the moving plate 114 is transmitted to the connecting rod 112 through the linkage plate 115. One end of the connecting rod 112 is fixedly connected to the extraction pipe 51, and the other end is connected to the connecting seat 111 fixed outside the installation base rod 451. Moreover, the number and distribution positions of the connecting rods 112 correspond one by one to the extraction pipes 51. In this way, the action of the electric push rod 113 is transmitted to the installation base rod 451 and the extraction pipe 51 through the moving plate 114, the linkage plate 115 and the connecting rod 112, causing them to extend into the fixed mold 2. At this time, the output member 45 inside the installation base rod 45 starts to work. The high-temperature steam generated by the mold cavity heating assembly 4 enters the output chamber 452 through the steam delivery pipe 44, and then sprays out from the nozzle 455 through the main pipe 453 and the branch pipe 454 to preheat the mold cavity. At the same time, the extraction pipe 51 is communicated with the mold cavity through the extraction holes 10 on its outer wall. Under the action of the water vapor extraction assembly 5, the gaseous impurities in the mold cavity, such as the water vapor generated by preheating, etc., are timely extracted to ensure the cleanliness of the internal environment of the mold cavity. During the die-casting stage, when casting, the output end of the electric push rod 113 extends towards the side away from the fixed mold 2, driving the moving plate 114 to move in the reverse direction. Through the linkage of the linkage plate 115 and the connecting rod 112, the installation base rod 451 and the extraction pipe 51 are displaced synchronously until their ends are flush with the inner surface of the fixed mold 2. Such a position adjustment can avoid the interference of the installation base rod 451 and the extraction pipe 51 on the normal die-casting process, ensuring that the automotive non-ferrous metal liquid can be smoothly injected into the mold cavity and the die-casting is completed. During the mold opening and ejection stage, when the die-casting is completed, the fixed mold 2 and the moving mold 1 are separated from each other. At this time, the electric push rod 113 is started again, and its output end drives the moving plate 114, the linkage plate 115, and the connecting rod 112 to move, thereby pushing the installation base rod 451 and the extraction pipe 51 into the fixed mold 2. The ends of the installation base rod 451 and the extraction pipe 51 act on the die-cast automotive non-ferrous metal workpiece, ejecting it from the fixed mold 2 to complete the entire die-casting process flow.

[0087] In a preferred embodiment of the present invention, it can be further configured as: as Figure 2 、 Figure 5 shown; the mold release agent spraying assembly 6 includes:

[0088] The mold release agent storage tank 61 is fixedly installed on the surface of the connecting frame 3, and the high-temperature wax-based mold release agent is stored in the mold release agent storage tank 61;

[0089] The pump body 62 is fixedly installed on the outer side of the release agent storage tank 61, and its suction end penetrates and extends to the inner side of the release agent storage tank 61;

[0090] The release agent output pipe 63, one end of which is communicated with the output end of the pump body 62, and the other end of which is communicated with the output chamber 452. The release agent storage tank 61 stores high-temperature wax-based release agent inside, which provides raw materials for the entire spraying process. The pump body 62 fixed on the outer side of the release agent storage tank 61 has a suction end that penetrates and extends into the tank. When the release agent needs to be sprayed, the pump body 62 is started, and the high-temperature wax-based release agent in the release agent storage tank 61 is sucked into the pump body 62 by generating suction. Then, the release agent sucked into the pump body 62 is conveyed through the release agent output pipe 63 connected to the output end of the pump body 62. The other end of the release agent output pipe 63 is connected to the output chamber 452. After the high-temperature wax-based release agent enters the output chamber 452 through the release agent output pipe 63, it will flow through the main pipe 453 and the branch pipe 454 like the flow path of the high-temperature steam in the output member 45 before, and finally be sprayed out from the nozzle 455, evenly spraying on the surface of the mold cavity to form an isolation film. This isolation film can help the workpiece be smoothly removed from the mold cavity after the die casting of non-ferrous metal workpieces is completed, and at the same time does not affect the surface quality and performance of the workpiece.

[0091] In a preferred embodiment of the present invention, it can be further configured as: as Figure 1 、 Figure 2 and Figure 5 shown; The air and volatile extraction assembly 7 includes:

[0092] The second suction pipe 71, one end of which is communicated with the extraction pipe 51, and its quantity and distribution position are adapted to the extraction pipe 51;

[0093] The adsorption tank 72 is fixedly installed on the surface of the connecting frame 3 away from the fixed mold 2, and the other end of the second suction pipe 71 is communicated with the adsorption tank 72;

[0094] The second annular extraction pipe 73 is fixedly installed on the outer side of the adsorption tank 72 and is communicated with the adsorption tank 72;

[0095] The second vacuum pump 74 is fixedly installed on the surface of the connecting frame 3 away from the fixed mold 2. The suction end of the second vacuum pump 74 is communicated with the second annular extraction pipe 73. After the second vacuum pump 74 is started, its suction end is communicated with the adsorption tank 72 through the second annular extraction pipe 73, and the inside of the second annular extraction pipe 73 is quickly evacuated to a negative pressure state. Since one end of the second extraction pipe 71 is communicated with the extraction pipe 51, and the quantity and distribution position are adapted to it, and the other end is connected to the adsorption tank 72, under the action of the negative pressure formed between the adsorption tank 72 and the second annular extraction pipe 73, gaseous impurities such as water vapor, bubbles, gas films and volatiles in the mold cavity will enter the extraction pipe 51 through the extraction holes 10 on the outer wall of the extraction pipe 51. After these gaseous impurities enter the extraction pipe 51, they flow along the pipeline and are sucked into the adsorption tank 72 through the second extraction pipe 71. After the gaseous impurities enter the adsorption tank 72, harmful components, volatiles, etc. in them will be adsorbed by the adsorption material to realize the purification and collection of the gaseous impurities. After being treated by the adsorption tank 72, they are finally pumped out by the second vacuum pump 74 and discharged or further processed.

[0096] In a preferred embodiment of the present invention, it can be further configured as: as Figure 2 , Figure 9As shown in the figure; a third solenoid valve 12 is provided on the second suction pipe 71, and an adsorption and collection member 13 is provided in the adsorption tank 72. The adsorption and collection member 13 is one or a combination of activated carbon adsorbent, molecular sieve or filter membrane. A replacement channel is provided in the adsorption tank 72 to facilitate the subsequent replacement of the adsorption and collection member 13. When it is necessary to extract water vapor, bubbles, gas films and volatiles in the mold cavity, the second vacuum pump 74 is started, and a negative pressure is formed in the adsorption tank 72 and the second suction pipe 71 through the second annular extraction pipe 73. At this time, the operator can open the third solenoid valve 12 according to actual needs. After the third solenoid valve 12 is opened, the gaseous impurities in the mold cavity enter the adsorption tank 72 through the extraction pipe 51 and the second suction pipe 71 under the action of negative pressure. The third solenoid valve 12 plays a role in controlling the flow on and off of gaseous impurities. It is closed when extraction is not required to prevent external air from entering the system and affecting the negative pressure environment; during the extraction process, the flow rate and pressure can also be adjusted according to needs to ensure the stability and controllability of the extraction process. After the gaseous impurities enter the adsorption tank 72, they will come into contact with the adsorption and collection member 13. The adsorption and collection member 13 can be one of activated carbon adsorbent, molecular sieve or filter membrane, or a combination of several. If activated carbon adsorbent is used, it has a rich pore structure and a large specific surface area, and can physically adsorb organic volatiles and the like in gaseous impurities and firmly fix them in the pores; the molecular sieve, relying on its uniform microporous structure, selectively adsorbs according to the molecular size and polarity, effectively removing bubbles, gas films and volatiles; the filter membrane can block gaseous impurities such as bubbles, gas films and volatiles and play a filtering role. Through the synergistic effect of these adsorption and collection members 13, the harmful substances in gaseous impurities can be removed to the greatest extent, making the discharged gas cleaner and avoiding adverse effects on the subsequent die-casting process. When the adsorption and collection member 13 reaches adsorption saturation, it can be replaced or regenerated.

[0097] The specific working principle of a die-casting mold for automotive workpieces of the present invention is as follows:

[0098] Before die-casting, prepare the work. Start the electric push rod 113 in the driving member 11. The output end of the electric push rod 113 drives the moving plate 114, the linkage plate 115 and the connecting rod 112 to act, so that the installation base rod 451 and the extraction pipe 51 extend into the fixed mold 2, and the nozzle 455 of the output member 45 is in a suitable position. Subsequently, turn on the mold cavity heating assembly 4. The electric heating wire 43 inside the heating tank 42 is energized to generate heat and heat the water in the tank. The water is vaporized into high-temperature steam. At this time, open the first solenoid valve outside the steam delivery pipe 44. The high-temperature steam enters the output member 45 through the steam delivery pipe 44. After being preliminarily evenly distributed in the equalizing chamber of the output chamber 452, it passes through the main pipe 453 and the branch pipe 454, and finally is evenly sprayed into the mold cavity from the nozzle 455 to preheat the mold cavity;

[0099] After the preheating is completed, the water vapor extraction component 5 is started, the second solenoid valve 8 on the first suction pipe 52 is opened, and the first vacuum pump 54 starts to work. Under the action of the pressure difference, the water vapor in the mold cavity enters the extraction pipe 51 through the extraction holes 10 on the outer wall of the extraction pipe 51, and then enters the steam buffer tank 53 through the first suction pipe 52. The steam buffer tank 53 temporarily stores and buffers the water vapor. After that, the first vacuum pump 54 extracts the water vapor in the steam buffer tank 53 through the first annular extraction pipe 55 and transports it to the heating tank 42 through the discharge pipe 56 to achieve heat recovery and prevent the oxidation of non-ferrous metal liquid;

[0100] After the mold cavity preheating is completed and the water vapor extraction is finished, the mold release agent spraying component 6 is started. The pump body 62 is started to suck the high-temperature wax-based mold release agent in the mold release agent storage tank 61 and transport it to the output chamber 452 through the mold release agent output pipe 63. Along the paths of the main pipe 453 and the branch pipe 454, it finally sprays out from the nozzle 455 to uniformly form an isolation film on the surface of the high-temperature mold cavity;

[0101] After the mold release agent is sprayed, the air and volatile extraction component 7 is started. The third solenoid valve 12 on the second suction pipe 71 is opened, and the second vacuum pump 74 is started to form a negative pressure in the adsorption tank 72 and the second suction pipe 71 through the second annular extraction pipe 73. The gaseous impurities such as bubbles, gas films and volatiles generated by the mold release agent in the mold cavity enter the adsorption tank 72 through the extraction pipe 51 and the second suction pipe 71 and are adsorbed and purified by the adsorption collection member 13 in the adsorption tank 72. The treated gas is extracted and discharged or further processed by the second vacuum pump 74;

[0102] Then it enters the die-casting stage. The output end of the electric push rod 113 drives the installation base rod 451 and the extraction pipe 51 to displace, so that their ends are flush with the inner surface of the fixed mold 2 to avoid affecting normal die-casting. The moving mold 1 and the fixed mold 2 are closed, and the non-ferrous metal liquid for automobiles is injected into the mold cavity for casting;

[0103] After die-casting is completed, the fixed mold 2 is separated from the moving mold 1, and the electric push rod 113 is started again to push the installation base rod 451 and the extraction pipe 51 into the fixed mold 2. The displacement of the two is used to eject the die-cast non-ferrous metal workpiece for automobiles from the mold. In the whole use process, each component works together, effectively improving the die-casting quality and production efficiency of non-ferrous metal workpieces for automobiles, and at the same time reducing the equipment space occupation.

[0104] It should be noted that, in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising the said element.

[0105] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automotive workpiece die-casting mold, comprising a moving die (1) and a fixed die (2). The moving die (1) and the fixed die (2) are combined to form a mold cavity for casting automotive non-ferrous metal workpieces. A connecting frame (3) is provided on the surface of the fixed die (2) away from the moving die (1), and it is characterized in that, Further included are: A cavity heating assembly (4), which is arranged on the connecting frame (3) and penetrates and extends into the fixed mold (2). The cavity heating assembly (4) is used to input high-temperature steam into the cavity to preheat the inside of the cavity; A water vapor extraction assembly (5), which is arranged on the connecting frame (3) and penetrates and extends into the fixed mold (2). The water vapor extraction assembly (5) is in communication with the cavity heating assembly (4). The water vapor extraction assembly (5) is used to extract the water vapor in the cavity and transport it into the cavity heating assembly (4) to prevent the oxidation of automotive non-ferrous metal liquid and recover heat to preheat the cavity heating assembly (4); A mold release agent spraying assembly (6), which is arranged on the connecting frame (3) and penetrates and extends into the fixed mold (2). The mold release agent spraying assembly (6) is used to spray the mold release agent into the high-temperature cavity; An air and volatile matter extraction assembly (7), which is arranged on the connecting frame (3) and penetrates and extends into the fixed mold (2). It is used to extract the bubbles, air films and volatiles formed by the mold release agent in the cavity to keep the inside of the cavity clean.

2. The die-casting mold for automotive workpieces according to claim 1, characterized in that, The cavity heating assembly (4) includes: A first mounting base (41), which is fixedly installed on the side surface of the connecting frame (3); A heating tank (42), which is fixedly installed on the surface of the first mounting base (41). Water is filled in the heating tank (42); An electric heating wire (43), which is arranged inside the heating tank (42). The electric heating wire (43) is used to heat the water in the heating tank (42) to form high-temperature steam; A steam delivery pipe (44), one end of which is in communication with the heating tank (42), and the other end is communicated with an output member (45). The output end of the output member (45) penetrates the fixed mold (2) and extends to the inside of the fixed mold (2).

3. The die-casting mold for automotive workpieces according to claim 2, characterized in that, The output member (45) includes: A mounting base rod (451), which penetrates the fixed mold (2) and extends to the inside of the fixed mold (2). An installation cavity is formed inside the mounting base rod (451). The end of the steam delivery pipe (44) far from the heating tank (42) penetrates the mounting base rod (451) and extends into the installation cavity; An output chamber (452), which is fixedly installed in the installation cavity of the mounting base rod (451). An equalizing chamber is arranged inside the output chamber (452). The end of the steam delivery pipe (44) far from the heating tank (42) is in communication with the output chamber (452). The steam delivery pipe (44) is used to transport high-temperature steam into the equalizing chamber of the output chamber (452); A main pipe (453), one end of which is in communication with the equalizing chamber of the output chamber (452), and the other end is closed; Branch pipes (454), one end of which is in communication with the main pipe (453), and the other end is communicated with a spray head (455) extending outside the mounting base rod (451). The number of the branch pipes (454) is several and they are annularly and equidistantly distributed around the axis of the main pipe (453). The number and distribution positions of the spray heads (455) are adapted to the branch pipes (454).

4. The die-casting mold for automotive workpieces according to claim 3, characterized in that, The water vapor extraction assembly (5) includes: The extraction pipe (51) is disposed through the connecting frame (3) and one end thereof extends to the inside of the fixed mold (2); The first extraction pipe (52), one end of which is communicated with the end of the extraction pipe (51) away from the movable mold (1); The steam buffer tank (53) is fixedly installed on the surface of the connecting frame (3) away from the fixed mold (2), and the other end of the first extraction pipe (52) is communicated with the steam buffer tank (53); The first vacuum pump (54) is fixedly installed on the surface of the first installation base (41), and its extraction end is communicated with a first annular extraction pipe (55) that is communicated with the steam buffer tank (53). The delivery end of the first vacuum pump (54) is communicated with the discharge pipe (56) of the heating tank (42).

5. The die-casting mold for automotive workpieces according to claim 4, characterized in that, The number of the extraction pipes (51) is not less than four and is evenly distributed in a ring shape around the center of the fixed mold (2). The number and distribution positions of the first extraction pipes (52) and the steam buffer tank (53) are adapted to the extraction pipes (51). A second solenoid valve (8) is further provided on the first extraction pipe (52), and a one-way valve (9) is further provided on the discharge pipe (56). The extraction pipe (51) is a pipe body with both ends closed. A plurality of extraction holes (10) are formed on the outer wall of the extraction pipe (51) and are evenly distributed in a ring shape. The extraction pipe (51) is communicated with the mold cavity through the extraction holes (10).

6. The die-casting mold for automotive workpieces according to claim 4, wherein, A driving member (11) that is linked with the installation base rod (451) and the extraction pipe (51) is further provided on the surface of the connecting frame (3) away from the fixed mold (2). The driving member (11) is used to drive the installation base rod (451) to move on the fixed mold (2) to output steam and drive the extraction pipe (51) to synchronously displace on the fixed mold (2) to extract gaseous impurities from the mold cavity, and also eject the automotive non-ferrous metal workpiece in the mold cavity by opening the mold through the installation base rod (451) and the extraction pipe (51).

7. A die-casting mold for automotive workpieces according to claim 1, characterized in that, The driving member (11) includes: The connecting seat (111) is fixedly installed on the outside of the installation base rod (451) and is integrally provided with the installation base rod (451); The connecting rod (112), one end of which is fixedly installed on the outside of the connecting seat (111), and the other end is fixedly connected with the extraction pipe (51). The number and distribution positions of the connecting rods (112) are adapted to the extraction pipes (51) one by one; The electric push rod (113) is fixedly installed on the surface of the connecting frame (3) away from the fixed mold (2), and the output end of the electric push rod (113) faces away from the connecting frame (3); The moving plate (114) is fixedly installed on the output end of the electric push rod (113) and can move synchronously with the displacement of the output end of the electric push rod (113); The linkage plate (115), one end of which is fixedly installed on one surface of the moving plate (114), and the other end is fixedly installed on the surface of the connecting rod (112).

8. A die-casting mold for automotive workpieces according to claim 3, characterized in that, The mold release agent spraying assembly (6) includes: The mold release agent storage tank (61) is fixedly installed on the surface of the connecting frame (3). The mold release agent storage tank (61) contains a high-temperature wax-based mold release agent; The pump body (62) is fixedly installed on the outer side of the release agent storage tank (61), and its suction end penetrates and extends to the inner side of the release agent storage tank (61); The release agent output pipe (63), one end of which is communicated with the output end of the pump body (62), and the other end of which is communicated with the output chamber (452).

9. The die-casting mold for automotive workpieces according to claim 4, wherein, The air and volatile extraction assembly (7) includes: The second suction pipe (71), one end of which is communicated with the extraction pipe (51), and its quantity and distribution position are adapted to the extraction pipe (51); The adsorption tank (72) is fixedly installed on the surface of the connecting frame (3) away from the fixed mold (2), and the other end of the second suction pipe (71) is communicated with the adsorption tank (72); The second annular extraction pipe (73) is fixedly installed on the outer side of the adsorption tank (72) and is communicated with the adsorption tank (72); The second vacuum pump (74) is fixedly installed on the surface of the connecting frame (3) away from the fixed mold (2), and the suction end of the second vacuum pump (74) is communicated with the second annular extraction pipe (73).

10. A die-casting mold for automotive workpieces according to claim 9, characterized in that, A third solenoid valve (12) is arranged on the second suction pipe (71), and an adsorption and collection member (13) is arranged in the adsorption tank (72), wherein the adsorption and collection member (13) is one or a combination of activated carbon adsorbent, molecular sieve or filter membrane.

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