Rotary pouring method and device for precise casting of gypsum mold fired mold

Abstract

The invention belongs to the technical field of gypsum mold precision investment casting, and relates to a rotary pouring method and device for gypsum mold precision investment casting, which comprises the following steps of: placing and fixing a casting mold in a pouring tank, adjusting the position of a pouring ladle frame in the pouring tank by using an empty pouring ladle, and positioning the empty pouring ladle and a pouring gate of the casting mold at an angle of 90 degrees; a pouring nozzle of the pouring ladle is flush with the inner edge of a pouring gate of the casting mold, and a gap of 0-5 mm is reserved; the casting ladle frame and the casting mold synchronously realize stepless variable-speed rotation; the casting ladle frame is adjusted to be in the horizontal state, the empty casting ladle is taken out, and the casting ladle containing the molten metal is fixed to the casting ladle frame; a tank door of the pouring tank is closed, the pouring tank is vacuumized, and after the vacuum degree reaches a set value, the pouring ladle and the casting mold are controlled to rotate synchronously according to the set rotating speed, and pouring is conducted; and removing vacuum after pouring, and pressurizing and solidifying. According to the invention, alloy liquid turbulence can be reduced, variable flow velocity and variable flow controllability of molten metal pouring are realized, the yield of batch products is improved, and the casting cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of gypsum mold investment casting, and in particular relates to a gypsum mold investment casting rotary pouring method and a device. Background Art

[0002] The traditional pouring method of gypsum mold investment casting is manual vacuum pouring and pressurized solidification: first, put the baked mold into the pouring tank, and the operator uses a ladle to scoop the alloy liquid, then put the ladle full of alloy liquid on the ladle rack and adjust the mold position according to the ladle mouth so that the alloy liquid can be smoothly poured into the mold cavity when the ladle rack is rotated. Then, start the vacuum operation, and after the vacuum degree reaches the process requirements, manually rotate the ladle rack for pouring. After the pouring is completed, close the tank door and start pressurized solidification and time until the solidification is completed according to the process requirements, remove the mold and start natural cooling.

[0003] The entire pouring process is manually operated, and the main problems are as follows:

[0004] 1) The efficiency of fixing the ladle position is low. The placement deviation of the mold gate and the ladle mouth before pouring requires the mold position to be adjusted each time, which is inefficient and poses a safety hazard.

[0005] 2) The ladle is located at a high distance from the casting gate, which easily leads to turbulence and instability during the pouring process, and a greater tendency for air entrainment and slag inclusion.

[0006] 3) The flow rate and velocity of the alloy liquid in the casting process depend on the operator's skills. The quality of each casting varies greatly, and the qualified rate of castings by different operators also varies greatly. The flow rate and velocity of the entire casting process are greatly affected by human factors, and the quality control is unstable.

[0007] 4) The pouring process lacks digitization, the process stability is poor, the qualification rate of castings with high internal quality requirements is low, and the production cost is high.

[0008] Therefore, technical personnel in this field urgently need to develop a new gypsum mold investment casting rotation casting method and device. Summary of the invention

[0009] The purpose of the present invention is to develop a new gypsum mold investment casting rotary pouring method and device to solve the above-mentioned technical problems.

[0010] Based on one of the purposes of the present invention, the technical solution proposed in this application is:

[0011] The gypsum mold investment casting rotation casting method comprises the following steps:

[0012] S1. Place and fix the mold in the pouring tank, then use an empty ladle to adjust the position of the ladle rack in the pouring tank, position the empty ladle at a 90° angle to the gate of the mold, and make the pouring nozzle of the ladle flush with the inner edge of the gate of the mold, leaving a gap of 0-5mm;

[0013] S2, making the ladle stand and the casting mold rotate synchronously with each other at infinitely variable speeds;

[0014] S3, adjust the ladle stand to a horizontal state, take out the empty ladle, and fix the ladle containing molten metal to the ladle stand;

[0015] S4, close the door of the pouring tank, evacuate the pouring tank, and after the vacuum degree reaches the set value, control the ladle and the casting mold to rotate synchronously at the set speed and perform pouring;

[0016] S5. After pouring, remove the vacuum and introduce compressed air into the pouring tank for pressurized solidification;

[0017] S6. After solidification, exhaust and release the pressure, then open the tank door, shovel away the mold, and remove the ladle.

[0018] Preferably, the setting speed in step S4 is controlled according to the following process:

[0019] Control the ladle to rotate toward the direction of the casting mold. In the first 20° range, it rotates 5° per second, in the range of 20° to 70°, it rotates 10° per second, and in the range of 70° to 90°, it rotates 15° per second.

[0020] Based on the second purpose of the present invention, the present application proposes a gypsum mold investment casting rotary pouring device based on the above-mentioned pouring method, including a pouring tank, an automatic rotating mechanism and a control cabinet, both ends of the pouring tank can be opened and closed and sealed with tank doors, the automatic rotating mechanism includes a mold fixing plate, a ladle fixing plate and a stepless speed motor, the mold fixing plate and the ladle fixing plate are arranged perpendicular to each other to form an L-shaped mounting seat, the L-shaped mounting seat is rotatably connected to the inside of the pouring tank through a driving rod, the stepless speed motor and the control cabinet are arranged on the outside of the pouring tank, and the stepless speed motor and the control cabinet are arranged on the outside of the pouring tank, and the stepless speed motor and the control cabinet are arranged on the outside of the pouring tank. The output shaft of the variable speed motor is drivingly connected to the driving rod, the control cabinet is electrically connected to the stepless variable speed motor, two groups of upper and lower corresponding horizontal slide grooves are arranged on the mold fixing plate, each group of horizontal slide grooves is slidably connected with an L-shaped clamping plate through a limit assembly, the gap between the two L-shaped clamping plates is matched with the mold, and the L-shaped clamping plate is provided with a clamping assembly for clamping the mold, a ladle adjustment seat is provided on the ladle adjustment seat, a ladle is adjustably arranged on the ladle adjustment seat, and the central axis of the ladle is arranged at a 90° angle to the central axis of the gate of the mold.

[0021] Preferably, the output shaft of the continuously variable speed motor is connected to the end of the driving rod extending to the outside of the pouring tank through a coupling.

[0022] Preferably, the limiting assembly includes a slider slidably connected in a horizontal slide groove, the top of the slider is fixedly connected to the L-shaped clamp, and the bottom of the slider is threadedly connected with a fixing bolt, the head of the fixing bolt is tightly attached to the bottom of the casting fixing plate, and the outer diameter of the head of the fixing bolt is larger than the groove width of the horizontal slide groove, and the fixing bolt is used to limit the position of the slider in the horizontal slide groove, and the position of the slider in the horizontal slide groove can be adjusted and fixed by loosening and tightening the fixing bolt.

[0023] Preferably, the clamping assembly includes a plurality of buckles matching the base of the mold, and the buckles are arranged in a rectangular array on two L-shaped clamping plates. The mold and the L-shaped clamping plates are connected by the buckles, which is convenient and quick to operate.

[0024] The top of described sliding panel also is provided with an interlocking structure, and the interlocking structure is hinged on the base plate, is used for the interlocking of sliding panel and the interlocking structure of sliding panel, and the interlocking structure is hinged on the base plate, is used for the interlocking structure of sliding panel and the interlocking structure of sliding panel. Through the above arrangement, it is convenient to adjust and position the ladle up and down, left and right, and front and back, so that the pouring nozzle of the ladle is aligned with the pouring gate of the casting mold.

[0025] Preferably, a plurality of support plates are arranged in parallel on the lower side of the inner part of the pouring tank, the support plates are arranged in parallel with the driving rod, a reinforcing rod is fixed on the driving rod, and the reinforcing rod is arranged at the bottom of the mold fixing plate. By arranging the support plates, it is convenient to assist in supporting the mold fixing plate and the ladle fixing plate when placing the mold or ladle in the pouring tank, and by arranging the reinforcing rod, the connection strength between the mold fixing plate and the driving rod can be improved.

[0026] Preferably, a vacuum tube, an exhaust pipe and a pressurized air inlet pipe are penetrated on the side wall of the pouring tank, and a vacuum valve, an exhaust valve and an air inlet valve are respectively provided on the vacuum tube, the exhaust pipe and the pressurized air inlet pipe, the end of the vacuum tube away from the pouring tank is connected to a vacuum pump, and the end of the pressurized air inlet pipe away from the pouring tank is connected to an air compressor, the vacuum valve, the exhaust valve and the air inlet valve are all electric valves, and the vacuum valve, the exhaust valve, the air inlet valve, the vacuum pump and the air compressor are respectively electrically connected to the control cabinet.

[0027] The gypsum mold investment casting rotary pouring device in the present invention also includes other devices, structures or components that enable it to be used normally, all of which are conventional means in the field. In addition, the devices, structures or components not limited in the present invention, such as buckles, electric valves, control cabinets, continuously variable speed motors, casting molds and ladles, etc., all adopt the existing technologies in the field.

[0028] The working principle of the present invention is to open the tank doors on both sides when in use, adjust the mold fixing plate to the horizontal level through the stepless speed motor, adjust the gap and position of the two L-shaped clamps to match the mold according to the size of the mold to be poured and the position of the gate, and then fix the two L-shaped clamps so that the gate position of the mold is fixed to the center of the pouring tank, and each specification mold can be adjusted once. Then fix the insulation pouring riser on the gate of the mold, adjust the ladle rack to the horizontal level through the stepless speed motor, use the empty ladle to adjust the position of the two arc clamps and fix them, so that the pouring nozzle of the empty ladle is flush with the inner edge of the gate of the mold, and the gap is 0-5mm. Then use a special ladle to quantitatively scoop the molten metal and place it on the two arc clamps, close the tank doors on both sides, open the vacuum valve to evacuate, and after the vacuum degree reaches the process requirements, select the speed casting program specified by the process and start the stepless speed motor to start rotating casting. After the pouring is completed, close the vacuum valve, immediately open the air intake valve for pressurized solidification, and close the air intake valve after the pressure reaches the process requirements. After pressurized solidification is completed, open the exhaust valve to remove the pressure, open the tank doors on both sides, take out the mold and ladle respectively, and prepare for the next round of operations.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1) Reduce alloy liquid turbulence, ensure smooth filling, reduce gas intrusion into alloy liquid under vacuum conditions, and reduce alloy liquid rolling and slag inclusion casting defects.

[0031] 2) Reduce the instability and uncontrollable factors of artificial pouring flow, and realize variable flow rate and controllable flow rate of molten metal pouring.

[0032] 3) Reduce the probability of forming pores and slag inclusion defects during the casting process and improve the internal quality pass rate.

[0033] 4) Easy curing process, greatly improving the yield rate of batch products.

[0034] 5) For aviation Class I products with high internal quality requirements, the quality of the casting process can be controlled, reducing casting costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a process flow chart of the present invention in Example 1.

[0036] Figure 2 This is a schematic diagram of the overall structure of the present invention in Example 2.

[0037] Figure 3 for Figure 2 A-section structure enlarged schematic diagram.

[0038] Figure 4 This is a schematic diagram of the front structure of the present invention in Example 2.

[0039] Figure 5 This is a schematic diagram of the back structure of the present invention in Example 2.

[0040] Figure 6 Schematic diagram of the top view of the present invention in Example 2 DETAILED DESCRIPTION

[0041] The technology of the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0042] Example 1

[0043] This embodiment records in detail the specific pouring process and process of preparing a certain aviation Class I casting product (mirror body, external dimensions 182*156*167, sand box dimensions 280*280*300, aluminum alloy weight 8 kg) using the gypsum mold investment casting rotation casting method of the present application:

[0044] like Figure 1 As shown, the following steps are included:

[0045] 1. Shovel the mirror body mold from the roasting furnace to the front of the pouring tank and glue the insulation riser.

[0046] 2. Place and fix the mold in the pouring tank, then use an empty ladle to adjust the position of the ladle rack in the pouring tank, position the empty ladle at a 90° angle to the gate of the mold, and make the ladle's pouring nozzle flush with the inner edge of the gate of the mold, leaving a gap of 0-5mm;

[0047] 3. Make the ladle stand and the casting mold rotate synchronously at infinitely variable speeds, adjust the ladle stand to a horizontal state, take out the empty ladle, and fix the ladle containing molten metal to the ladle stand;

[0048] 4. Close the tank door. After the vacuum is exhausted to the required level, control the ladle and the mold to rotate synchronously and pour according to the set speed. Control the ladle to rotate in the direction of the mold. The set speed is 5° per second in the first 20° range; 10° per second in the range of 20° to 70°; and 15° per second in the range of 70° to 90°.

[0049] 5. After pouring, remove the vacuum and turn on the compressed air to pressurize and solidify.

[0050] 6. After solidification, remove the pressure, open the pouring tank door, shovel away the mold, and remove the ladle.

[0051] The internal quality pass rate of products cast using the above-mentioned device and process is more than 30% higher than that of manual operation, meeting the product delivery requirements.

[0052] Example 2

[0053] like Figures 2 to 6 As shown, this embodiment proposes a gypsum mold investment casting rotary pouring device for realizing the pouring method in Example 1, including a pouring tank 1, an automatic rotating mechanism and a control cabinet 2, both ends of the pouring tank can be opened and closed and sealed with a tank door 3, the automatic rotating mechanism includes a mold fixing plate 4, a ladle fixing plate 5 and a continuously variable speed motor 6, the mold fixing plate and the ladle fixing plate are arranged perpendicular to each other to form an L-shaped mounting seat, the L-shaped mounting seat is rotatably connected to the inside of the pouring tank through a driving rod 7, the continuously variable speed motor and the control cabinet are arranged on the outside of the pouring tank (in this embodiment, the continuously variable speed motor and the control cabinet are respectively connected by corresponding supports The frame is fixed on the ground), and the output shaft of the continuously variable speed motor is connected to the driving rod through a coupling, the control cabinet is electrically connected to the continuously variable speed motor, and two groups of upper and lower corresponding horizontal slide grooves 8 are arranged on the mold fixing plate, and each group of horizontal slide grooves is slidably connected with an L-shaped clamping plate 9 through a limit assembly, the gap between the two L-shaped clamping plates is matched with the mold 10, and the L-shaped clamping plate is provided with a clamping assembly for clamping the mold, the ladle fixing plate is provided with a ladle adjustment seat, and the ladle adjustment seat is adjustably provided with a ladle 11, and the central axis of the ladle is correspondingly arranged at a 90° angle to the central axis of the gate 12 of the mold.

[0054] In this embodiment, the limiting assembly includes a slider 13 slidably connected in the horizontal slide groove, the top of the slider is fixedly connected to the L-shaped clamp, and the bottom of the slider is threadedly connected with a fixing bolt (not shown in the figure), the head of the fixing bolt is tightly attached to the bottom of the casting fixing plate, and the outer diameter of the head of the fixing bolt is larger than the groove width of the horizontal slide groove, and the fixing bolt is used to limit the position of the slider in the horizontal slide groove, and the position of the slider in the horizontal slide groove can be adjusted and fixed by loosening and tightening the fixing bolt.

[0055] Specifically, the clamping assembly includes four buckles (not shown in the figure) that match the base of the mold. The buckles are arranged in a rectangular array on two L-shaped clamping plates. The mold and the L-shaped clamping plates are connected by the buckles, which is convenient and quick to operate.

[0056] More specifically, the ladle adjustment seat includes a sliding base 14 and a ladle frame 15. The ladle fixing plate is correspondingly provided with two guide grooves 16 perpendicular to the mold fixing plate. The sliding base is slidably connected to the guide groove through a guide block (not shown in the figure). A positioning bolt (not shown in the figure) is threadedly connected to the guide block. The head of the positioning bolt is tightly attached to the bottom of the sliding base, and the outer diameter of the head of the positioning bolt is larger than the groove width of the guide groove. The positioning bolt is used to fix the position of the guide block in the guide groove. A threaded rod 17 and a A guide rod 18 is provided at both ends of the ladle frame, threaded holes and guide holes matching the threaded rod and the guide rod are provided respectively, the bolt rod is threadedly connected to two adjusting nuts 19, the two adjusting nuts are respectively tightly attached to the top and bottom of the ladle frame, the tops of the two ends of the ladle frame are provided with clamping seats 20, the two clamping seats are respectively slidably connected with clamping rods 21, the corresponding ends of the two clamping rods are provided with arc-shaped clamping plates 22 matching the ladle, the ladle is clamped between the two arc-shaped clamping plates, and the clamping seats are threadedly connected with locking bolts (not shown in the figure) that can lock the clamping rods. Through the above arrangement, it is convenient to adjust and position the ladle up and down, left and right, and front and back, so that the pouring nozzle of the ladle is aligned with the pouring mouth of the casting mold.

[0057] In this embodiment, a plurality of support plates 23 are arranged in parallel on the lower side of the inner part of the pouring tank, and the support plates are arranged in parallel with the driving rod. A reinforcing rod 24 is fixed on the driving rod, and the reinforcing rod is arranged at the bottom of the mold fixing plate. By arranging the support plates, it is convenient to assist the mold fixing plate and the ladle fixing plate in placing the mold or ladle in the pouring tank, and by arranging the reinforcing rod, the connection strength between the mold fixing plate and the driving rod can be improved.

[0058] Specifically, a vacuum tube 25, an exhaust pipe 26 and a pressurized air intake pipe 27 are provided on the side wall of the pouring tank, and a vacuum valve (not shown in the figure), an exhaust valve (not shown in the figure) and an air intake valve (not shown in the figure) are provided on the vacuum tube, the exhaust pipe and the pressurized air intake pipe, respectively. A vacuum pump (not shown in the figure) is connected to the end of the vacuum tube away from the pouring tank, and an air compressor (not shown in the figure) is connected to the end of the pressurized air intake pipe away from the pouring tank. The vacuum valve, the exhaust valve and the air intake valve are all electric valves, and the vacuum valve, the exhaust valve, the air intake valve, the vacuum pump and the air compressor are electrically connected to the control cabinet, respectively.

[0059] The working principle of the present invention is to open the tank doors on both sides when in use, adjust the mold fixing plate to the horizontal level through the stepless speed motor, adjust the gap and position of the two L-shaped clamps to match the mold according to the size of the mold to be poured and the position of the gate, and then fix the two L-shaped clamps so that the gate position of the mold is fixed to the center of the pouring tank, and each specification mold can be adjusted once. Then fix the insulation pouring riser on the gate of the mold, adjust the ladle rack to the horizontal level through the stepless speed motor, use the empty ladle to adjust the position of the two arc clamps and fix them, so that the pouring nozzle of the empty ladle is flush with the inner edge of the gate of the mold, and the gap is 0-5mm. Then use a special ladle to quantitatively scoop the molten metal and place it on the two arc clamps, close the tank doors on both sides, open the vacuum valve to evacuate, and after the vacuum degree reaches the process requirements, select the speed casting program specified by the process and start the stepless speed motor to start rotating casting. After the pouring is completed, close the vacuum valve, immediately open the air intake valve for pressurized solidification, and close the air intake valve after the pressure reaches the process requirements. After pressurized solidification is completed, open the exhaust valve to remove the pressure, open the tank doors on both sides, take out the mold and ladle respectively, and prepare for the next round of operations.

[0060] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A gypsum mold investment casting spin casting method, characterized in that: The steps include: S1. Place and fix the mold in the pouring tank, then use an empty ladle to adjust the position of the ladle rack in the pouring tank, position the empty ladle at a 90° angle to the gate of the mold, and make the ladle spout flush with the inner edge of the gate of the mold, leaving a gap of 0-5mm; S2, making the ladle stand and the casting mold rotate synchronously with each other at infinitely variable speeds; S3, adjust the ladle stand to a horizontal state, take out the empty ladle, and fix the ladle containing molten metal to the ladle stand; S4, close the door of the pouring tank, evacuate the pouring tank, and after the vacuum degree reaches the set value, control the ladle and the casting mold to rotate synchronously at the set speed and perform pouring; S5. After pouring, remove the vacuum and introduce compressed air into the pouring tank for pressurized solidification; S6. After solidification, exhaust and release the pressure, then open the tank door, shovel away the mold, and remove the ladle.

2. The gypsum mold investment casting rotary pouring method according to claim 1, characterized in that: The setting speed in step S4 is controlled according to the following process: Control the ladle to rotate toward the direction of the casting mold. In the first 20° range, it rotates 5° per second, in the range of 20° to 70°, it rotates 10° per second, and in the range of 70° to 90°, it rotates 15° per second.

3. A gypsum mold investment casting rotary pouring device for realizing the pouring method described in claim 1 or 2, comprising a pouring tank, both ends of which are openably and sealably connected to tank doors, characterized in that: The cam is an L-shaped mounting plate which is arranged perpendicular to the casting mold, and the L-shaped mounting plate is rotatably connected to the inside of the casting tank by a driving rod. The L-shaped mounting plate is arranged outside the casting tank, and the output shaft of the L-shaped motor is connected to the driving rod by transmission. The control cabinet is electrically connected to the L-shaped motor. Two groups of horizontal slide grooves corresponding to the upper and lower groups are arranged on the casting mold fixing plate, and each group of horizontal slide grooves is slidably connected with an L-shaped clamping plate through a limiting assembly. The gap between the two L-shaped clamping plates is matched with the casting mold, and a clamping assembly for clamping the casting mold is provided on the L-shaped clamping plate. A ladle adjustment seat is provided on the ladle adjustment seat, and a ladle is adjustably arranged on the ladle adjustment seat. The central axis of the ladle is arranged at a 90° angle to the central axis of the casting gate of the casting mold.

4. The gypsum mold investment casting rotary pouring device according to claim 3 is characterized in that: The output shaft of the continuously variable speed motor is connected to one end of the driving rod extending to the outside of the pouring tank through a coupling.

5. The gypsum mold investment casting rotary pouring device according to claim 3, characterized in that: The limiting assembly includes a slider slidably connected in a horizontal slide groove, the top of the slider is fixedly connected to the L-shaped clamp plate, and the bottom of the slider is threadedly connected with a fixing bolt, the head of the fixing bolt is tightly attached to the bottom of the casting fixing plate, and the outer diameter of the head of the fixing bolt is larger than the groove width of the horizontal slide groove, and the fixing bolt is used to limit the position of the slider in the horizontal slide groove.

6. The gypsum mold investment casting rotary pouring device according to claim 3, characterized in that: The clamping assembly includes a plurality of buckles matching the base of the casting, and the buckles are arranged in a rectangular array on two L-shaped clamping plates.

7. The gypsum mold investment casting rotary pouring device according to claim 3, characterized in that: The ladle adjustment seat comprises a sliding base and a ladle frame, the ladle fixing plate is correspondingly provided with two guide grooves perpendicular to the casting mold fixing plate, the sliding base is slidably connected to the guide groove through a guide block, a positioning bolt is threadedly connected to the guide block, the head of the positioning bolt is tightly against the bottom of the sliding base, and the outer diameter of the head of the positioning bolt is larger than the groove width of the guide groove, the positioning bolt is used to fix the position of the guide block in the guide groove, a threaded rod and a guide rod are correspondingly provided at the top of both ends of the sliding base, threaded holes and guide holes matching the threaded rod and the guide rod are respectively provided at both ends of the ladle frame, the bolt rod is threadedly connected with two adjusting nuts, and the two adjusting nuts are respectively tightly against the top and bottom of the ladle frame, a clamping seat is correspondingly provided at the top of both ends of the ladle frame, a clamping rod is respectively slidably connected to the two clamping seats, and an arc-shaped clamping plate matching the ladle is correspondingly provided at one end of the two clamping rods, the ladle is clamped between the two arc-shaped clamping plates, and a locking bolt that can lock the clamping rod is threadedly connected to the clamping seat.

8. The gypsum mold investment casting rotary pouring device according to claim 3, characterized in that: A plurality of support plates are arranged in parallel on the lower inner side of the pouring tank, and the support plates are arranged in parallel with the driving rod. A reinforcing rod is fixed on the driving rod, and the reinforcing rod is arranged at the bottom of the mold fixing plate.

9. The gypsum mold investment casting rotary pouring device according to claim 3, characterized in that: A vacuum tube, an exhaust pipe and a pressurized air inlet pipe are provided on the side wall of the pouring tank, and a vacuum valve, an exhaust valve and an air inlet valve are provided on the vacuum tube, the exhaust pipe and the pressurized air inlet pipe respectively. The end of the vacuum tube away from the pouring tank is connected to a vacuum pump, and the end of the pressurized air inlet pipe away from the pouring tank is connected to an air compressor. The vacuum valve, the exhaust valve and the air inlet valve are all electric valves, and the vacuum valve, the exhaust valve, the air inlet valve, the vacuum pump and the air compressor are electrically connected to the control cabinet respectively.

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