Simple liquid extraction device for sand casting

Abstract

The utility model discloses a simple and easy liquid pumping device for sand mould casting belongs to foundry liquid pumping technical field. A simple and easy liquid pumping device for sand mould casting, including solution bucket, resin / solidifying agent bucket, air hose, air pipe quick -operation joint, locking interface, galvanized liquid passing pipe and locking clamp, the air inlet part and liquid outlet part of resin / solidifying agent bucket are welded with first straight pipe and second straight pipe with female thread respectively, and locking interface is connected with first straight pipe or second straight pipe through bottom female thread cylinder and is sealed with screw thread. The utility model discloses a liquid pumping device, and the solution bucket can be filled with liquid at a long distance, and personnel do not need to keep watch after filling liquid stably, can use multiple resin / solidifying agent buckets to fill liquid in the solution bucket simultaneously, is suitable for continuous production, significantly improves work efficiency, and by using galvanized liquid passing pipe and liquid inlet hose as liquid flow channel, the pipeline has strong strong acid and strong alkali corrosion resistance, and does not appear the phenomenon such as blockage and jam.

Description

Technical Field

[0001] This utility model relates to the field of casting liquid extraction technology, and in particular to a simple liquid extraction device for sand casting. Background Technology

[0002] An automatic sand mixer is a key piece of equipment in the foundry industry. It primarily mixes molding sand, binders, and other materials uniformly to prepare foundry sand that meets specific requirements. Its feeding system features an automatic weighing device to precisely control the proportions of raw materials such as sand and binders, enabling continuous sand mixing. Binders for self-hardening resin sand molds are generally classified as acid-curing furan resins and alkali-curing phenolic urethane resins.

[0003] The automatic sand mixer mainly consists of a sand inlet hopper, resin tank, hardener tank, control system, and mixing drum. The resin tank and hardener tank are two separate liquid storage devices that enter the mixing drum through pipelines. To ensure continuous production, both types of solution tanks have relatively large volumes (generally 5-20 cubic meters). Therefore, during the initial production preparation, small buckets (50kg) of resin and hardener need to be added to the mixing drum. Both solution tanks are quite large, making manual pouring almost impossible; a pump is required to draw the resin from the small buckets into the solution tanks.

[0004] Resin and curing agent are chemical liquids, and a chemical reaction will occur when they come into contact. Therefore, it is essential to ensure the purity of the liquids in both solution tanks and prevent them from being mixed. Generally, at least two sets of pumps are required. Commonly used resins and curing agents are usually strong acids or strong alkalis, and the liquids have a certain viscosity and are corrosive, which will corrode and clog the pumps, reducing their service life. After prolonged use, the pumps may experience jamming or malfunction during liquid extraction, resulting in reduced transfer efficiency, delays in production, and cumbersome manual operation. Regular replacement of the pumps also increases production costs. Utility Model Content

[0005] The purpose of this invention is to solve the problems of low pumping efficiency, inconvenience of use and high cost of existing pumping pumps, and to propose a simple pumping device for sand casting that is easy to use and low in cost.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A simple liquid extraction device for sand casting includes a solution tank, a resin / curing agent tank, an air hose, a quick-connect air hose, a locking interface, a galvanized liquid transfer pipe, and a locking clamp.

[0008] The air inlet and liquid outlet of the resin / curing agent tank are respectively welded with a first straight pipe and a second straight pipe with internal threads, and the locking interface is connected to the first straight pipe or the second straight pipe with a threaded seal through the bottom external threaded cylinder.

[0009] The upper end of the galvanized liquid pipe is connected to the liquid inlet hose via a locking interface, and the lower end of the galvanized liquid pipe is immersed below the liquid surface in the resin / curing agent tank. The other end of the liquid inlet hose is connected to the liquid inlet of the solution tank.

[0010] In some embodiments, the air hose is connected to a compressed air source via a quick-connect air hose, and the compressed air enters the resin / curing agent tank through the air hose to drive the liquid through the galvanized liquid pipe and the liquid inlet hose to the solution tank.

[0011] In some embodiments, the upper part of the galvanized liquid pipe is machined with external threads, and the galvanized liquid pipe is locked with a threaded connection. The bottom of the galvanized liquid pipe is 2-3 cm away from the bottom of the resin / curing agent barrel.

[0012] In some embodiments, a straight section of pipe is welded to the top of the locking interface, and the air hose is fixed to the straight section of pipe by a locking clamp.

[0013] In some embodiments, the solution tank is provided with an exhaust port and a liquid inlet at the top, and the liquid inlet is sealed to the liquid inlet hose.

[0014] In some embodiments, the air hose, galvanized liquid pipe, and liquid inlet hose are marked with corresponding connections for reassembly.

[0015] In some embodiments, a valve switch is provided between the quick-connect air hose and the compressed air hose, and the valve switch is used to regulate the gas pressure.

[0016] In some embodiments, a bend joint is installed at the upper end of the galvanized liquid pipe, and the liquid inlet hose is fixed to the bend joint by a locking clamp.

[0017] In some embodiments, the locking interface has an internal thread in the middle, which engages with the external thread of the galvanized liquid pipe for a sealing connection.

[0018] Compared with the prior art, the present invention provides a simple liquid extraction device for sand casting, which has the following beneficial effects.

[0019] 1. With the liquid extraction device of this utility model, liquid can be added to the solution tank from a distance. Only the length of the air hose and the liquid inlet hose needs to be increased. After the liquid addition is stable, personnel do not need to monitor it all the time. Multiple resin / curing agent tanks can be used to add liquid to the solution tank of the equipment at the same time, which is suitable for continuous production and can significantly improve work efficiency.

[0020] 2. This utility model uses a galvanized liquid passage pipe and a liquid inlet hose as the liquid flow channel, which makes the pipeline have strong resistance to strong acid and strong alkali corrosion, and will not cause blockage or jamming. It is also easy to clean after use.

[0021] 3. The liquid extraction device of this utility model has a simple and practical structure. Except for the galvanized liquid pipe, air hose and liquid inlet hose, the other components can be used for a long time. Moreover, the replacement cost of the galvanized liquid pipe, air hose and liquid inlet hose is low, which can effectively reduce production costs.

[0022] 4. This utility model, through a further improved air hose, incorporates a corrugated pipe as a pressure buffer, effectively absorbing pulse fluctuations in compressed air. This delays pressure transmission during sudden pressure changes, compensates for pressure gaps caused by rapid pressure drops, reduces the risk of pumping interruptions, and maintains the continuity of pumping operations. Simultaneously, the design of the first and second one-way valves ensures unidirectional gas flow, preventing liquid backflow into the air hose and avoiding contamination and corrosion by highly corrosive liquids. This extends the service life of the air hose and reduces the risk of leakage due to hose damage.

[0023] 5. This utility model improves the resin / curing agent tank by using an electric push rod combined with pressure gauge feedback to actively reduce the volume of the lower tank to offset the space changes caused by liquid consumption, maintain stable air pressure inside the tank, ensure uniform and continuous liquid supply flow, avoid interruption or speed fluctuation of liquid extraction due to air pressure fluctuation, reduce gas-liquid mixing and discharge, improve liquid extraction efficiency and quality, adapt to the extraction needs of liquids with different viscosities, reduce equipment maintenance costs, extend service life and ensure production safety.

[0024] Other advantages, objectives and features of this invention will be set forth in part in the description which follows; and in part will be apparent to those skilled in the art upon examination of the following description; or may be taught from practice of this invention. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the device of this utility model.

[0026] Figure 2 This is a schematic diagram of the connection between the air hose and the resin / curing agent container of this utility model.

[0027] Figure 3 This is a schematic diagram illustrating the liquid extraction principle of this utility model.

[0028] Figure 4 This is a schematic diagram of the locking interface structure corresponding to the second straight pipe of this utility model.

[0029] Figure 5 This is a schematic diagram of the locking interface structure corresponding to the first straight tube of this utility model.

[0030] Figure 6 This is a schematic diagram illustrating the structure of the bellows, the first check valve, and the second check valve of this utility model.

[0031] Figure 7 This is a schematic diagram of the improved structure of the resin / curing agent bucket of this utility model.

[0032] Figure 8 This utility model Figure 7 A magnified structural diagram of area A in the middle.

[0033] Figure 9 This utility model Figure 7 A magnified structural diagram of area B in the middle.

[0034] In the picture:

[0035] 1. Solution tank; 101. Exhaust port; 102. Liquid inlet; 2. Resin / curing agent tank; 201. Air hose; 2011. First hose section; 2012. Second hose section; 2013. Corrugated pipe; 2014. First check valve; 2015. Second check valve; 202. Galvanized liquid passage pipe; 2021. Counterweight; 2022. First liquid passage hose; 2023. Second liquid passage hose; 2024. Connecting rod; 2025. Counterweight ring; 2026. Liquid inlet pipe; 203. Locking clamp; 204. Locking interface; 205. Air hose quick connector; 3. Liquid inlet hose; 4. Lower tank body; 401. Upper cover; 402. Electric push rod; 4021. Pressure plate; 403. First sealing ring; 404. Fixing screw; 405. Second sealing ring; 5. Connecting hose. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0037] Reference Figures 1-5 A simple liquid extraction device for sand casting includes: a solution tank 1, a resin / curing agent tank 2, an air hose 201, an air hose quick connector 205, a locking interface 204, a galvanized liquid pipe 202, and a locking clamp 203. The top of the solution tank 1 is provided with an exhaust port 101 and a liquid inlet 102.

[0038] The air inlet of the resin / curing agent container 2 is machined and shaped. A first straight pipe is welded inside the air inlet interface for connecting the air hose 201. Specifically, the first straight pipe has an internal thread, and the bottom of the locking interface 204 has an external threaded cylinder. The locking interface 204 is threadedly and sealed to the first straight pipe through the external threaded cylinder.

[0039] The interface of the liquid outlet of the resin / curing agent tank 2 is machined and formed. A second straight pipe is welded inside the interface of the liquid outlet. The inner side of the second straight pipe is provided with internal threads. The locking interface 204 is connected to the second straight pipe threadedly through the bottom external threaded cylinder.

[0040] The air inlet of the resin / curing agent tank 2 is connected to the liquid inlet hose 3 via a galvanized liquid pipe 202. The end of the liquid inlet hose 3 away from the galvanized liquid pipe 202 is connected to the liquid inlet 102 of the solution tank 1. When installing the galvanized liquid pipe 202, the height of the resin / curing agent tank 2 is measured first, and then a galvanized liquid pipe 202 of the appropriate size is cut. External threads are machined on the upper half of the galvanized liquid pipe 202, which is then connected to the locking interface 204. A bend connector is installed at the upper end of the galvanized liquid pipe 202, and the liquid inlet hose 3 is fixed to the upper end of the galvanized liquid pipe 202 by a locking clamp 203.

[0041] After the components are assembled, insert the quick-connect fitting 205 into the end of the air hose 201 furthest from the resin / hardener tank 2. The end of the quick-connect fitting 205 furthest from the air hose 201 is equipped with a compressed air pipe with a valve switch, which is connected to an air compressor. When the air compressor is started, compressed air enters the resin / hardener tank 2 sequentially through the quick-connect fitting 205 and the air hose 201 by slowly opening the valve on the compressed air pipe.

[0042] Under gas pressure, the liquid in the resin / curing agent tank 2 rises through the galvanized pipe submerged in the liquid. At this time, observe the inlet hose 3 between the solution tank 1 and the galvanized liquid pipe 202. If liquid slowly flows out, it means that the liquid extraction is successful. The gas pressure can be increased slowly, and the deformation of the resin / curing agent tank 2 should be observed. After confirming that there is no deformation, this state can be maintained until the liquid extraction is completed. If there is deformation, the air pressure can be reduced slowly by opening and closing the air valve.

[0043] In this utility model, the interfaces of the air inlet and liquid outlet of the resin / curing agent tank 2 are first processed according to the dimensions. External threads are processed on the galvanized liquid pipe 202. Air hose 201, liquid inlet hose 3, locking clamp 203 and quick air pipe connector 205 of the corresponding dimensions are purchased.

[0044] Then, according to the dimensions, internal threads are machined inside the first and second straight pipes, and the first and second straight pipes are welded to the inlet and outlet ports of the resin / curing agent tank 2, respectively.

[0045] Prepare the purchased resin / curing agent bucket 2 in advance, and remove the two sealing caps on the top of the resin / curing agent bucket 2. At the same time, open the liquid inlet 102 and the exhaust port 101 of the solution tank 1 of the automatic sand mixer.

[0046] likeFigure 2 , Figure 3 and Figure 5 As shown, the external threaded cylinder at the bottom of the locking interface 204 is then screwed into the first straight pipe of the air inlet of the resin / curing agent tank 2 to complete the sealing and fixing of the locking interface 204 and the top cover of the resin / curing agent tank 2. A straight section pipe is also welded and fixed to the top of the locking interface 204 corresponding to the first straight pipe. The straight section pipe and the air hose 201 are matched in size. The air hose 201 is connected to the straight section pipe at the top of the locking interface 204 by means of a clamp.

[0047] like Figure 2 , Figure 3 and Figure 4 As shown, screw the external threaded sleeve at the bottom of the locking interface 204 into the second straight pipe at the liquid outlet of the resin / curing agent tank 2 to complete the sealing and fixing of the locking interface 204 and the top cover of the resin / curing agent tank 2. The locking interface 204 corresponding to the second straight pipe has an internal thread in the middle that matches the external thread on the galvanized liquid pipe 202. Screw the galvanized liquid pipe 202 into the locking interface 204 and continue to screw it down until the bottom of the galvanized liquid pipe 202 is 2-3 cm away from the bottom of the resin / curing agent tank 2. Then, connect the liquid inlet hose 3 to the upper part of the galvanized liquid pipe 202 and fix it securely with a clamp. Then, insert the end of the liquid inlet hose 3 away from the resin / curing agent tank 2 into the liquid inlet 102 of the solution tank 1 and fix it.

[0048] Connect the end of the quick-connect fitting 205 away from the air hose 201 to the workshop's compressed air hose with a switch. Slowly open the switch on the compressed air hose and observe the flow rate of the liquid in the inlet hose 3. Once the flow rate of the liquid in the inlet hose 3 stabilizes, maintain the existing air pressure until the liquid addition is complete.

[0049] Subsequently, based on production needs, each component can be disassembled sequentially and installed in the new resin / hardener tank 2. The liquid extraction process can then be repeated in the same manner. After completion, the galvanized liquid inlet pipe 202, air hose 201, and liquid inlet hose 3 should be cleaned promptly. Markings should be made on the air hose 201, galvanized liquid inlet pipe 202, liquid inlet hose 3, and the two locking interfaces 204 corresponding to the air inlet and liquid outlet of the resin / hardener tank 2, respectively, to facilitate quick and accurate connection during the next assembly.

[0050] The liquid extraction device of this invention can add liquid to the solution tank 1 from a distance. It only requires increasing the length of the air hose 201 and the liquid inlet hose 3. After the liquid addition is stable, personnel do not need to monitor it continuously. Multiple resin / curing agent tanks 2 can be used to add liquid to the solution tank 1 of the equipment at the same time, which is suitable for continuous production and can significantly improve work efficiency.

[0051] Furthermore, by using a galvanized liquid-passing pipe 202 and an inlet hose 3 as the liquid flow channel, the pipeline has strong resistance to strong acid and alkali corrosion, preventing blockages and jamming. Cleaning is also convenient after use. This liquid extraction device has a simple and practical structure. Except for the galvanized liquid-passing pipe 202, air hose 201, and inlet hose 3, all other components are durable and have low replacement costs, effectively reducing production costs.

[0052] Please see Figures 1-6 As shown, as a further improvement to the air hose 201 in the above scheme: the air hose 201 includes a first hose section 2011 and a second hose section 2012, a corrugated pipe 2013 is provided between the first hose section 2011 and the second hose section 2012, a first one-way valve 2014 is provided at one end of the first hose section 2011 near the corrugated pipe 2013, and a second one-way valve 2015 is provided at one end of the second hose section 2012 near the corrugated pipe 2013.

[0053] In use, compressed air enters the resin / curing agent tank 2 sequentially through the second hose section 2012, the bellows 2013, and the first hose section 2011. The bellows 2013, with its elastic expansion and contraction characteristics, absorbs pulse fluctuations in the compressed air, acting as a pressure buffer. Specifically, when a sudden pressure change occurs, the compressed gas pushes the bellows 2013 to expand axially, temporarily storing excess gas and delaying the transmission of gas pressure to the resin / curing agent tank 2. When the pressure drops sharply, the bellows 2013 retracts and resets, releasing the gas inside. During this process, the second one-way valve 2015 prevents the gas released from the bellows 2013 from flowing back to the air source, temporarily compensating for the pressure gap. This period is used to cover the restart of the air compressor or the adjustment of the valve between the quick-connect fitting 205 and the compressed air pipe. The above-mentioned design improvements reduce the impact of sudden pressure drops on liquid extraction interruptions during actual use, thus maintaining the continuity of liquid extraction production.

[0054] The first check valve 2014 and the second check valve 2015 ensure that the gas can only flow in one direction, preventing the liquid from flowing back from the resin / curing agent tank 2 to the air hose 201 when the compressed gas supply stops. This avoids contamination and corrosion of the air hose 201 and improves its service life.

[0055] like Figures 1-9As shown, the above solution is further improved, especially regarding the resin / curing agent tank 2. The resin / curing agent tank 2 includes a lower tank body 4 and an upper cover body 401. The lower tank body 4 and the upper cover body 401 are sealed and fixedly connected. As one embodiment of the sealing and fixing method of the lower tank body 4 and the upper cover body 401, a first sealing ring 403 is provided on the outer bottom of the upper cover body 401, and a second sealing ring 405 is provided on the outer top of the lower tank body 4. The first sealing ring 403 and the second sealing ring 405 are sealed and connected. The first sealing ring 403 and the second sealing ring 405 are provided with threaded holes, and the threaded holes of the first sealing ring 403 and the second sealing ring 405 are fixedly connected by a fixing screw 404.

[0056] An electric push rod 402 is provided in the middle of the upper cover 401. The telescopic end of the electric push rod 402 is fixedly connected to a pressure plate 4021. A sealing ring is provided at the edge of the pressure plate 4021. The sealing ring is preferably a sealing air bladder. By filling the sealing air bladder with gas, the sealing between the pressure plate 4021 and the lower barrel 4 is maintained, ensuring the safety of operators and the cleanliness of the production environment. It also prevents external impurities from entering the lower barrel 4 and contaminating the raw materials.

[0057] The bottom of the first straight pipe inside the air inlet of the resin / curing agent tank 2 is provided with a connecting hose 5. The bottom end of the connecting hose 5 passes through the pressure plate 4021 and is fixedly connected to the pressure plate 4021.

[0058] The bottom of the second straight pipe inside the outlet of the resin / curing agent tank 2 is provided with a first liquid-passing hose 2022. The bottom end of the first liquid-passing hose 2022 is provided with a connecting pipe, which is fixedly connected to the pressure plate 4021. The bottom end of the connecting pipe passes through the pressure plate 4021. The first liquid-passing hose 2022 is fixedly connected to the second liquid-passing hose 2023 through the connecting pipe. The bottom of the second liquid-passing hose 2023 is provided with a counterweight 2021.

[0059] Specifically, the counterweight 2021 includes connecting rods 2024 located on both sides of the bottom of the second liquid-passing hose 2023. A counterweight ring 2025 is located at the bottom of each connecting rod 2024. The counterweight ring 2025 is vertically placed at the bottom of the lower tank 4. The counterweight 2021 provides limiting support for the second liquid-passing hose 2023, maintaining a specific distance (preferably 2-5 cm) between the bottom end of the second liquid-passing hose 2023 and the lower surface of the lower tank 4, maximizing the extraction of liquid from the lower tank 4 and minimizing residue. The lower tank 4 is equipped with an inlet pipe 2026 and a pressure gauge. The pressure gauge monitors the gas pressure inside the lower tank 4, and the inlet pipe 2026 is equipped with a valve.

[0060] During use, as the liquid level in the resin / curing agent tank 2 decreases, the air pressure inside the lower tank 4 decreases due to the increased internal space of the lower tank 4, leading to a gradual decrease or significant fluctuation in the supply flow rate, and even problems such as slowed or interrupted pumping speed. At this time, the electric push rod 402 moves the pressure plate 4021 downwards, and the first one-way valve 2014 prevents gas or liquid from flowing back into the air hose 201. Based on the pressure gauge in the lower tank 4, the downward movement speed of the electric push rod 402 is controlled, achieving the effect of actively regulating the gas space inside the lower tank 4. By reducing the internal volume of the lower tank 4, the change in internal space caused by the decrease in liquid is offset, thereby maintaining the air pressure inside the lower tank 4, ensuring a stable liquid output flow rate, and avoiding slowed or interrupted pumping speed.

[0061] Furthermore, the downward movement of the pressure plate 4021 not only pressurizes the liquid inside the resin / curing agent tank 2, but also reduces the amount of gas and liquid mixing and venting by decreasing the volume of the lower tank 4. Simultaneously, it keeps the space occupied by compressed air within the lower tank 4 within a stable range, further ensuring the stability of the pumping pressure and flow rate, effectively improving pumping efficiency and quality.

[0062] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A simple liquid extraction device for sand casting, comprising a solution tank (1) and a resin / curing agent tank (2), characterized in that: It also includes an air hose (201), an air hose quick connector (205), a locking interface (204), a galvanized liquid pipe (202), and a locking clamp (203); The air inlet and liquid outlet of the resin / curing agent tank (2) are respectively welded with a first straight pipe and a second straight pipe with internal threads. The locking interface (204) is connected to the first straight pipe or the second straight pipe by a bottom external threaded cylinder. The upper end of the galvanized liquid pipe (202) is connected to the liquid inlet hose (3) through the locking interface (204), and the lower end of the galvanized liquid pipe (202) is immersed below the liquid surface in the resin / curing agent tank (2). The other end of the liquid inlet hose (3) is connected to the liquid inlet (102) of the solution tank (1).

2. The simple liquid extraction device for sand casting according to claim 1, characterized in that, The air hose (201) is connected to a compressed air source via a quick-connect fitting (205). The compressed air enters the resin / curing agent tank (2) through the air hose (201) and drives the liquid through the galvanized liquid pipe (202) and the liquid inlet hose (3) to be transported to the solution tank (1).

3. The simple liquid extraction device for sand casting according to claim 1, characterized in that, The galvanized liquid pipe (202) has external threads on its upper part. The galvanized liquid pipe (202) is connected to the locking interface (204) through the thread. The bottom of the galvanized liquid pipe (202) is 2-3cm away from the bottom of the resin / curing agent bucket (2).

4. A simple liquid extraction device for sand casting according to claim 1, characterized in that, The top of the locking interface (204) is welded with a straight section pipe, and the air hose (201) is fixed to the straight section pipe by a locking clamp (203); The solution tank (1) is provided with an exhaust port (101) and an inlet port (102) at the top, and the inlet port (102) is sealed to the inlet hose (3).

5. A simple pumping device for sand casting according to claim 1, characterized in that, The air hose (201), galvanized liquid pipe (202) and liquid inlet hose (3) are marked with corresponding markings for connection during reassembly.

6. A simple liquid extraction device for sand casting according to claim 1, characterized in that, A valve switch is provided between the quick-connect fitting (205) and the compressed air pipe, and the valve switch is used to regulate the gas pressure.

7. A simple liquid extraction device for sand casting according to claim 1, characterized in that, A bend joint is installed at the upper end of the galvanized liquid pipe (202), and the liquid inlet hose (3) is fixed to the bend joint by a locking clamp (203); The locking interface (204) has an internal thread in the middle, which is used to seal and connect with the external thread of the galvanized liquid pipe (202).

8. A simple liquid extraction device for sand casting according to claim 1, characterized in that, The air hose (201) includes a first hose section (2011), a bellows (2013), and a second hose section (2012). The first hose section (2011) and the second hose section (2012) are respectively provided with a first one-way valve (2014) and a second one-way valve (2015) to prevent gas-liquid backflow. The bellows (2013) is used for buffering when air pressure fluctuates.

9. A simple pumping device for sand casting according to claim 1, characterized in that, The resin / curing agent tank (2) includes a lower tank body (4) and an upper cover body (401). An electric push rod (402) is provided in the middle of the upper cover body (401). The extension end of the electric push rod (402) is connected to a pressure plate (4021). The bottom of the first straight pipe of the air inlet of the resin / curing agent tank (2) is connected to the pressure plate (4021) through a connecting hose (5). The connecting hose (5) moves synchronously with the pressure plate (4021). The pressure plate (4021) descends as the liquid level in the lower tank body (4) decreases, thereby pressurizing the lower tank body (4) and reducing its volume.

10. A simple liquid extraction device for sand casting according to claim 9, characterized in that, The bottom of the second straight pipe at the liquid outlet of the resin / curing agent tank (2) is connected to the first liquid-passing hose (2022). The first liquid-passing hose (2022) is connected to the second liquid-passing hose (2023) through a connecting pipe. The bottom of the second liquid-passing hose (2023) is provided with a counterweight (2021) for limiting support. The counterweight (2021) keeps the bottom of the second liquid-passing hose (2023) 2-5cm away from the bottom of the lower tank body (4).

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