Casting mold for producing self-balancing multi-stage pump impeller

Abstract

The invention discloses a casting mold for self-balancing multistage pump impeller production, and belongs to the technical field of impeller production, the casting mold comprises a lower mold, the upper surface of the lower mold is connected with an upper mold through a guide rail, a feeding pipe is further arranged in the upper mold, an external connecting plate is fixed on the outer wall of the lower mold, and meanwhile, the surface of the external connecting plate is in bolted connection with a motor; a material box is fixedly connected to the outer wall of the lower mold, vent holes are formed in the surface of the lower mold, a cooling pipe is arranged on the surface of the lower mold, and meanwhile an inner plate is fixedly connected to the inner wall of the lower mold; the external connection plate is connected with a stress frame through a lifting assembly. According to the casting mold for producing the self-balancing multi-stage pump impeller, when a workpiece needs to be taken out, a motor is started, cooling liquid in a material box circularly flows in the material box and a cooling pipe at the moment, then cooling and heat dissipation can be better achieved, meanwhile, knocking rods and telescopic rods can intermittently hit a fixing block, a lower mold vibrates slightly, demolding can be assisted, and the production efficiency is improved. And the working efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of impeller manufacturing technology, specifically to a casting mold for producing a self-balancing multistage pump impeller. Background Technology

[0002] Self-balancing multistage pumps are suitable for high-pressure transportation of clean water and other media. They achieve efficient and stable operation by offsetting axial force through a balance disc-less structure. They are widely used in pressurization of mining, water supply and drainage, and industrial systems. The impeller is the core working component of the self-balancing multistage pump. It converts mechanical energy into the kinetic energy and pressure energy of the medium through high-speed rotation, and achieves long-distance, high-lift transportation of the medium by gradually increasing the pressure.

[0003] In the impeller production process, casting molds are required. The impeller casting mold is the core forming unit of the intelligent casting island. Relying on the island's automated system, it realizes intelligent control of processes such as mold closing, pouring, and cooling, shaping the impeller's precise contour and ensuring dimensional accuracy and forming quality. For example, in the impeller casting mold with publication number CN213496346U, during operation, a water pump draws water from the water tank through a water pipe. Cool water enters the cooling pipe through the water outlet pipe, cooling the mold and increasing the impeller's forming speed and production efficiency. Warm water enters the water tank through a cooler, making rational use of water resources through water circulation, increasing the practicality of the casting mold. The adjusting clamping block moves upward, and the compression spring drives the baffle to move to the right. The baffle drives the pushing block to move to the right through the push rod. The pushing block generates a rightward force on the impeller, causing the impeller to separate from the side wall. The hydraulic column drives the pushing column to move upward, pushing the impeller out of the mold, improving the impeller's production efficiency, reducing the impeller's damage rate, and improving the impeller's production quality. There is also a thin-walled impeller casting mold with publication number CN215090544U. When it is working, it overcomes the influence of environmental and human factors, realizes the feeding of thin-walled blades, and finally casts qualified and high-quality impellers, reducing the production casting risk and ensuring the safety of production operators.

[0004] After the impeller is formed, during demolding, in order to prevent the casting from sticking to the mold, prevent the blades from deforming or breaking during removal, and ensure the casting forming accuracy, an auxiliary demolding structure can be set up. If there is no reasonable auxiliary demolding structure, the casting will stick to the mold, which will increase the difficulty of operation for the staff and bring unnecessary trouble to the staff. Summary of the Invention

[0005] The purpose of this invention is to provide a casting mold for the production of self-balancing multistage pump impellers, in order to solve the problem mentioned in the background art that the lack of a reasonable auxiliary demolding structure causes the casting to stick to the mold, increasing the difficulty of operation for workers and causing unnecessary trouble for them.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a casting mold for producing a self-balancing multistage pump impeller, comprising a lower mold, an upper mold connected to the upper surface of the lower mold via a guide rail, a feeding pipe disposed inside the upper mold, an outer plate fixed to the outer wall of the lower mold, and a motor bolted to the surface of the outer plate; a material box fixedly connected to the outer wall of the lower mold, ventilation holes provided on the surface of the lower mold, and cooling pipes disposed on the surface of the lower mold, while an inner plate fixedly connected to the inner wall of the lower mold; a force-bearing frame connected to the outer plate via a lifting assembly, the upper surface of the force-bearing frame... An extrusion plate is fixedly connected to the surface, and the extrusion plate is slidably disposed inside the material box; the force-bearing frame is connected to a connecting pipe through a transmission component, and the connecting pipe is connected to a cooling pipe through an external auxiliary pipe; the connecting pipe is connected to a connecting frame through a reversing component, and a striking rod is fixedly connected to the outer wall of the connecting frame; a working block is also fixedly connected to the surface of the connecting pipe, and a telescopic rod is slidably disposed inside the working block through a reciprocating component; the upper mold is connected to a support plate through a long rod, an air bladder is bonded to the upper surface of the support plate, an upper connecting pipe is fixedly connected to the upper surface of the air bladder, and a nozzle is fixedly connected to the end of the upper connecting pipe.

[0007] Preferably, the lifting assembly includes a limiting rod slidably disposed inside the outer plate, wherein the force-bearing frame is fixedly connected to the upper surface of the limiting rod, and a cam is fixedly connected to the output end of the motor;

[0008] Meanwhile, the cam is located inside the force-bearing frame, the surface of the extrusion plate is in contact with the inner wall of the material box, the material box is connected to the cooling pipe through the conveying pipe, and the upper surface of the cooling pipe is provided with a vent pipe.

[0009] Preferably, the transmission assembly includes an external rod fixedly connected to the surface of the force-bearing frame, wherein the external rods are symmetrically distributed on both sides of the force-bearing frame, and the front of the external rod is viewed as an inverted "L" structure, while an auxiliary rod is fixedly connected to the surface of the external rod.

[0010] Preferably, the inner plate is rotatably provided with the connecting pipe, and the end of the connecting pipe is fixedly connected to a circular plate. The end of the circular plate is fixedly connected to a protruding rod, and the surface of the protruding rod and the surface of the auxiliary rod are both sleeved with pull rods.

[0011] Preferably, the reversing assembly includes an outer tube fixedly connected to the surface of the connecting pipe, and a guide groove is provided on the surface of the outer tube. A sliding rod is fixedly connected to the side of the connecting frame, and the sliding rod is slidably disposed inside the inner plate. A fixing block is fixedly connected to the inner wall of the lower mold.

[0012] Preferably, the fixing blocks are evenly distributed on the inner wall of the lower mold, a guide rod is fixedly connected to the inner wall of the slide rod, and the end of the guide rod is located inside the guide groove, the guide groove is annularly bent, the striking rod is evenly distributed on the surface of the connecting frame, and the striking rod corresponds one-to-one with the outermost fixing block.

[0013] Preferably, a force-bearing plate is slidably disposed inside the connecting tube, and a return spring is fixedly connected between the force-bearing plate and the connecting tube. Both the end of the connecting tube and the end of the circular plate are provided with vents.

[0014] Preferably, the reciprocating assembly includes a connecting spring fixedly connected to the inner wall of the working block, and the other side of the connecting spring is fixedly connected to the inner wall of the telescopic rod, with the telescopic rod distributed at equal angles inside the working block.

[0015] Preferably, when the airbag is in operation, it rises and falls with the upper mold. An air inlet pipe is fixedly connected to the side of the airbag, and a push plate is fixedly connected to the end of the connecting pipe. At the same time, the edge of the push plate has an arc-shaped structure.

[0016] Preferably, both the surface of the upper connecting pipe and the surface of the air intake pipe are provided with one-way valves.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: Adopting a novel structural design, when the workpiece needs to be removed, the motor starts, and the coolant inside the material box circulates in the material box and cooling pipes, thus improving cooling and heat dissipation. Simultaneously, the striking rod and telescopic rod intermittently strike the fixed block, causing slight vibration of the lower mold, which assists in demolding and improves work efficiency. The specific details are as follows:

[0018] (1) The casting mold for producing the self-balancing multistage pump impeller can start the motor when the workpiece needs to be removed, so that the extrusion plate can make reciprocating linear motion inside the material box under the action of the cam, the force frame and the limit rod. Then the extrusion plate can push the coolant into the cooling pipe and the connecting pipe, and then pull the coolant back. That is, the coolant circulates in the material box and the cooling pipe, which will cool down quickly and make the workpiece form faster.

[0019] (2) When the motor drives the force frame to move, the force frame drives the external rod and auxiliary rod to move synchronously. At this time, the auxiliary rod drives the circular plate to rotate in the same direction through the pull rod and the protrusion rod. When the circular plate rotates, it drives the connecting pipe and the fan to rotate. Then the fan can drive the airflow through the ventilation hole to cool the lower mold, which has the function of auxiliary cooling.

[0020] Furthermore, the inner wall of the ventilation hole is equipped with fixing blocks at equal intervals, which increases the contact area between the airflow and the lower mold, allowing for better cooling of the lower mold and improving work efficiency.

[0021] (3) When the connecting pipe rotates, the connecting pipe drives the outer pipe to rotate synchronously. At this time, the outer pipe drives the sliding rod and the connecting frame to move synchronously through the guide groove and guide rod. Then, the connecting frame intermittently hits the fixing block through the striking rod, causing the lower mold to vibrate slightly. This helps to alleviate the adhesion force between the casting and the lower mold during solidification shrinkage, reduce the workpiece deformation problem, and improve production accuracy. At the same time, the slight vibration plays an auxiliary role in the material feeding process.

[0022] Furthermore, during the flow of coolant, after entering the coolant, it pushes the telescopic rod inside the working block, causing the telescopic rod to reciprocate linearly inside the working block under the action of hydraulic pressure and connecting spring. In this way, the telescopic rod can intermittently strike the fixed block located in the middle, which plays an auxiliary vibration role, thereby enabling rapid demolding.

[0023] (4) After the casting mold for the production of the self-balancing multistage pump impeller is formed, the upper mold rises. At this time, the upper mold drives the pallet to rise synchronously, and then the air bag rises to a position that can be pressed by the push plate. That is, after the upper mold rises, the push plate will intermittently squeeze the air bag, and the air bag will intermittently spray air through the nozzle, which plays a role in assisting the cooling of the workpiece. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the connection structure between the lower mold and the upper mold of the present invention;

[0025] Figure 2 This is a schematic diagram of the connection structure between the mold and the airbag in this invention;

[0026] Figure 3 This is a schematic diagram of the connection structure between the motor and the cam in this invention;

[0027] Figure 4 This is a schematic diagram of the connection structure between the lower mold and the inner plate of the present invention;

[0028] Figure 5 This is a schematic diagram of the connection structure of the auxiliary rod, the protruding rod, and the pull rod of the present invention;

[0029] Figure 6 This is a schematic diagram of the working block distribution structure of the present invention;

[0030] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point A in the middle;

[0031] Figure 8 This is a schematic diagram of the working state structure of the connecting frame of the present invention;

[0032] Figure 9This is a schematic diagram of the connection structure between the connecting pipe and the load-bearing plate of the present invention;

[0033] Figure 10 This is a schematic diagram of the working block of the present invention in a cut state.

[0034] Figure 11 This is a schematic diagram of the airbag structure in its ascending state according to the present invention;

[0035] Figure 12 This is a schematic diagram of the mold opening state structure of the present invention.

[0036] In the diagram: 1. Lower mold; 2. Upper mold; 3. Outer plate; 4. Motor; 5. Cooling pipe; 6. Cam; 7. Force-bearing frame; 8. Material box; 9. Limiting rod; 10. Extrusion plate; 11. Outer rod; 12. Auxiliary rod; 13. Ventilation hole; 14. Inner plate; 15. Connecting pipe; 16. Round plate; 17. Protruding rod; 18. Pull rod; 19. Fixing block; 20. Outer pipe; 21. Guide groove; 22. Slide rod; 23. Connecting frame; 24. Guide rod; 25. Striking rod; 26. Support plate; 27. Airbag; 28. Push plate; 29. ​​Upper connecting pipe; 30. Nozzle; 31. Working block; 32. Telescopic rod; 33. Connecting spring; 34. Force-bearing plate; 35. Return spring. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1-12 The present invention provides the following technical solution: a casting mold for producing a self-balancing multistage pump impeller.

[0039] Example 1: The lifting assembly allows the extrusion plate 10 to intermittently push and pull the coolant inside the material bin 8, causing the coolant to circulate within the material bin 8 and the cooling pipe 5. Figures 1-3 As shown, it includes a lower mold 1, an upper mold 2 connected to the upper surface of the lower mold 1 via a guide rail, a feeding pipe inside the upper mold 2, an outer plate 3 fixedly connected to the outer wall of the lower mold 1, and a motor 4 bolted to the surface of the outer plate 3.

[0040] A material box 8 is fixedly connected to the outer wall of the lower mold 1. Ventilation holes 13 are opened on the surface of the lower mold 1. Cooling pipes 5 are provided on the surface of the lower mold 1. An inner plate 14 is fixedly connected to the inner wall of the lower mold 1. An outer plate 3 is connected to a force-bearing frame 7 through a lifting assembly. An extrusion plate 10 is fixedly connected to the upper surface of the force-bearing frame 7. The extrusion plate 10 is slidably disposed inside the material box 8. The lifting assembly includes a limiting rod 9 slidably disposed inside the outer plate 3. The force-bearing frame 7 is fixedly connected to the upper surface of the limiting rod 9. A cam 6 is fixedly connected to the output end of the motor 4. The cam 6 is disposed inside the force-bearing frame 7. The surface of the extrusion plate 10 is in contact with the inner wall of the material box 8. The material box 8 is connected to the cooling pipe 5 through a conveying pipe. A vent pipe is provided on the upper surface of the cooling pipe 5.

[0041] During operation, the lower mold 1 fits against the upper mold 2. Molten liquid is transported to the lower mold 1 through the feeding pipe on the upper mold 2. During the molding process and when the mold needs to be opened, the motor 4 on the surface of the outer plate 3 is started. When the motor 4 is working, it drives the cam 6 to rotate. When the cam 6 rotates, it pushes the force-bearing frame 7. Then, under the action of the cam 6 and the limit rod 9, the force-bearing frame 7 will make reciprocating linear motion in the vertical direction. That is, the force-bearing frame 7 will push the coolant through the extrusion plate 10. When the coolant is pushed, the coolant flows from the material box 8 to the cooling pipe 5. When the extrusion plate 10 descends, the coolant is pulled back into the material box 8. Thus, the coolant flows back and forth between the material box 8 and the cooling pipe 5, which has a better cooling effect.

[0042] Example 2: Through the provided transmission assembly, the connecting pipe 15 can rotate in the same direction inside the inner plate 14, such as... Figures 4-8 As shown, the force-bearing frame 7 is connected to a connecting pipe 15 via a transmission assembly, wherein the connecting pipe 15 is connected to the cooling pipe 5 via an external auxiliary pipe; the transmission assembly includes an external rod 11 fixedly connected to the surface of the force-bearing frame 7, and the external rod 11 is symmetrically distributed on both sides of the force-bearing frame 7, and the front of the external rod 11 is an inverted "L" structure, and an auxiliary rod 12 is fixedly connected to the surface of the external rod 11. The connecting pipe 15 is rotatably arranged inside the inner plate 14, and a circular plate 16 is fixedly connected to the end of the connecting pipe 15. A protruding rod 17 is fixedly connected to the end of the circular plate 16, and a pull rod 18 is sleeved and connected to both the surface of the protruding rod 17 and the surface of the auxiliary rod 12.

[0043] The connecting pipe 15 is connected to the connecting frame 23 via the reversing assembly. A striking rod 25 is fixedly connected to the outer wall of the connecting frame 23. The reversing assembly includes an outer pipe 20 fixedly connected to the surface of the connecting pipe 15. A guide groove 21 is provided on the surface of the outer pipe 20. A sliding rod 22 is fixedly connected to the side of the connecting frame 23. The sliding rod 22 is slidably disposed inside the inner plate 14. A fixing block 19 is fixedly connected to the inner wall of the lower mold 1.

[0044] The fixing blocks 19 are evenly distributed on the inner wall of the lower mold 1. The guide rod 24 is fixedly connected to the inner wall of the slide rod 22. The end of the guide rod 24 is located inside the guide groove 21. At the same time, the guide groove 21 is annularly bent. The striking rod 25 is evenly distributed on the surface of the connecting frame 23. The striking rod 25 corresponds to the outermost fixing block 19.

[0045] When the motor 4 drives the force-bearing frame 7 to move, the force-bearing frame 7 drives the outer rod 11 and the auxiliary rod 12 to move synchronously. At this time, the auxiliary rod 12 drives the circular plate 16 to rotate in the same direction through the pull rod 18 and the protruding rod 17. When the circular plate 16 rotates, it drives the connecting pipe 15 to rotate. At this time, the connecting pipe 15 drives the outer pipe 20 to rotate synchronously. Then, the outer pipe 20 drives the sliding rod 22 to slide inside the inner plate 14 through the guide groove 21 and the guide rod 24. At this time, the connecting frame 23 moves synchronously. Then, the connecting frame 23 intermittently hits the fixing block 19 through the striking rod 25, causing the lower mold 1 to vibrate slightly. This relieves the adhesion force between the casting and the lower mold 1 during solidification shrinkage, reduces the problem of workpiece deformation, and improves production accuracy. At the same time, during the material feeding process, the slight vibration of the lower mold 1 plays an auxiliary role in material feeding. Meanwhile, the surface of the connecting pipe 15 is equipped with a fan. The fan drives air through the ventilation hole 13, which also plays an auxiliary role in cooling.

[0046] Example 3: Unlike Example 2, the reciprocating assembly allows the telescopic rod 32 to reciprocate linearly within the working block 31. This allows the telescopic rod 32 to strike the fixed block 19, providing auxiliary vibration and optimizing the material feeding effect. Figure 9 and Figure 10 As shown, a force-bearing plate 34 is slidably arranged inside the connecting pipe 15, and a return spring 35 is fixedly connected between the force-bearing plate 34 and the connecting pipe 15. Furthermore, both the end of the connecting pipe 15 and the end of the circular plate 16 are provided with vents.

[0047] A working block 31 is fixedly connected to the surface of the connecting pipe 15. A telescopic rod 32 is slidably arranged inside the working block 31 through a reciprocating assembly. The reciprocating assembly includes a connecting spring 33 fixedly connected to the inner wall of the working block 31. The other side of the connecting spring 33 is fixedly connected to the inner wall of the telescopic rod 32. Meanwhile, the telescopic rod 32 is evenly distributed inside the working block 31.

[0048] When the coolant enters the connecting pipe 15, the force plate 34 is hydraulically pushed, and the return spring 35 is squeezed. At the same time, the hydraulic pressure also pushes the telescopic rod 32, causing it to slide inside the working block 31. The connecting spring 33 is squeezed. After the coolant is pulled back, the telescopic rod 32 moves back under the action of the connecting spring 33. The above process is repeated, and the telescopic rod 32 makes reciprocating linear motion inside the working block 31. As a result, the telescopic rod 32 will intermittently strike the middle fixing block 19, which increases the vibration amplitude of the lower mold 1. This provides a better demolding effect when the mold needs to be opened, allowing the workpiece to be better separated from the lower mold 1. After the mold is opened, the workpiece can be removed.

[0049] Example 4: Unlike Example 3, the airbag 27 allows the nozzle 30 to blow air after the upper mold 2 is opened, thus assisting in cooling. Figure 11 and Figure 12 As shown, the upper mold 2 is connected to a support plate 26 via a long rod, and an airbag 27 is bonded to the upper surface of the support plate 26. An upper pipe 29 is fixedly connected to the upper surface of the airbag 27, and a nozzle 30 is fixedly connected to the end of the upper pipe 29. When the airbag 27 is working, it rises and falls with the upper mold 2. An air inlet pipe is fixedly connected to the side of the airbag 27. A push plate 28 is fixedly connected to the end of the connecting pipe 15, and the edge of the push plate 28 is arc-shaped. One-way valves are provided on the surface of the upper pipe 29 and the surface of the air inlet pipe.

[0050] After the upper mold 2 opens, the upper mold 2 drives the support plate 26 and the air bag 27 to rise. Then, when the connecting pipe 15 drives the push plate 28 to rotate, the push plate 28 intermittently squeezes the air bag 27. When the air bag 27 is squeezed, the air bag 27 supplies air to the nozzle 30 through the upper pipe 29, and then the nozzle 30 blows air. When the push plate 28 does not squeeze the air bag 27, the air bag 27 inhales air and expands through the air inlet pipe. The above process is repeated, and the nozzle 30 is in a state of intermittent blowing air to cool the workpiece. During the operation of the air bag 27 and the nozzle 30, the one-way valve makes the airflow direction from the air bag 27 to the nozzle 30, and no backflow will occur.

[0051] The above is the entire working process of the device, and all contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0052] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A casting mold for producing a self-balancing multistage pump impeller, comprising a lower mold, an upper mold connected to the upper surface of the lower mold via a guide rail, a feeding pipe disposed inside the upper mold, an outer plate fixed to the outer wall of the lower mold, and a motor bolted to the surface of the outer plate; characterized in that: A material box is fixedly connected to the outer wall of the lower mold. Ventilation holes are opened on the surface of the lower mold, and cooling pipes are provided on the surface of the lower mold. An inner plate is fixedly connected to the inner wall of the lower mold. A force-bearing frame is connected to the outer plate through a lifting assembly. An extrusion plate is fixedly connected to the upper surface of the force-bearing frame, wherein the extrusion plate is slidably disposed inside the material box. The force-bearing frame is connected to a connecting pipe via a transmission assembly, and the connecting pipe is connected to a cooling pipe via an external auxiliary pipe; the connecting pipe is connected to a connecting frame via a reversing assembly, and a striking rod is fixedly connected to the outer wall of the connecting frame; a working block is also fixedly connected to the surface of the connecting pipe, and a telescopic rod is slidably installed inside the working block via a reciprocating assembly; The upper mold is connected to a support plate via a long rod. An air bladder is bonded to the upper surface of the support plate. An upper connecting pipe is fixedly connected to the upper surface of the air bladder, and a nozzle is fixedly connected to the end of the upper connecting pipe.

2. The casting mold for producing a self-balancing multistage pump impeller according to claim 1, characterized in that: The lifting assembly includes a limiting rod that is slidably disposed inside the outer plate, wherein the force-bearing frame is fixedly connected to the upper surface of the limiting rod, and a cam is fixedly connected to the output end of the motor; Meanwhile, the cam is located inside the force-bearing frame, the surface of the extrusion plate is in contact with the inner wall of the material box, the material box is connected to the cooling pipe through the conveying pipe, and the upper surface of the cooling pipe is provided with a vent pipe.

3. The casting mold for producing a self-balancing multistage pump impeller according to claim 1, characterized in that: The transmission assembly includes an external rod fixedly connected to the surface of the force-bearing frame. The external rods are symmetrically distributed on both sides of the force-bearing frame, and the front of the external rod is viewed as an inverted "L" structure. At the same time, an auxiliary rod is fixedly connected to the surface of the external rod.

4. The casting mold for producing a self-balancing multistage pump impeller according to claim 3, characterized in that: The inner plate is rotatably provided with the connecting pipe, and a circular plate is fixedly connected to the end of the connecting pipe. A protruding rod is fixedly connected to the end of the circular plate, and a pull rod is sleeved on both the surface of the protruding rod and the surface of the auxiliary rod.

5. The casting mold for producing a self-balancing multistage pump impeller according to claim 1, characterized in that: The reversing assembly includes an outer tube fixedly connected to the surface of the connecting pipe, and a guide groove is provided on the surface of the outer tube. A sliding rod is fixedly connected to the side of the connecting frame, and the sliding rod is slidably disposed inside the inner plate. A fixing block is fixedly connected to the inner wall of the lower mold.

6. The casting mold for producing a self-balancing multistage pump impeller according to claim 5, characterized in that: The fixing blocks are evenly distributed on the inner wall of the lower mold. A guide rod is fixedly connected to the inner wall of the slide rod, and the end of the guide rod is located inside the guide groove, which is annularly bent. The striking rods are evenly distributed on the surface of the connecting frame, and each striking rod corresponds to one of the outermost fixing blocks.

7. The casting mold for producing a self-balancing multistage pump impeller according to claim 4, characterized in that: A force-bearing plate is slidably arranged inside the connecting pipe, and a return spring is fixedly connected between the force-bearing plate and the connecting pipe. Vents are provided at the ends of the connecting pipe and the circular plate.

8. A casting mold for producing a self-balancing multistage pump impeller according to claim 7, characterized in that: The reciprocating assembly includes a connecting spring fixedly connected to the inner wall of the working block (31), and the other side of the connecting spring is fixedly connected to the inner wall of the telescopic rod. The telescopic rod is distributed at equal angles inside the working block.

9. A casting mold for producing a self-balancing multistage pump impeller according to claim 1, characterized in that: When the airbag is in operation, it rises and falls with the upper mold. An air inlet pipe is fixedly connected to the side of the airbag, and a push plate is fixedly connected to the end of the connecting pipe. The edge of the push plate is an arc-shaped structure.

10. A casting mold for producing a self-balancing multistage pump impeller according to claim 1, characterized in that: Both the surface of the upper connecting pipe and the surface of the air intake pipe are equipped with one-way valves.

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