Sewage pump casting mold and casting method thereof

Abstract

The invention provides a sewage pump casting mold and a casting method thereof, and belongs to the technical field of metal casting. Comprising a fixed mold and a movable mold, an annular sliding groove is formed in the side, close to the fixed mold, of the movable mold, a hollow sleeve is slidably sleeved with the annular sliding groove, a limiting ring is fixedly sleeved with the circumferential surface of the hollow sleeve, a spring is sleeved with the annular sliding groove, a cavity is formed in the hollow sleeve, and a plurality of air outlet holes are formed in the hollow sleeve; a connecting pipe communicating with the cavity is fixedly sleeved with the air outlet hole, a through groove communicating with the annular sliding groove is formed in the side face of the movable mold, and the connecting pipe is located in the through groove and communicates with the vacuum pump. By arranging the cooling flow channel and the hollow sleeve, during mold closing, the cooling flow channel communicates with the hollow sleeve, when a cooling metal solution enables a sewage pump cover to be formed, the vacuum pump sucks external air, the sucked air cools the fixed mold and the movable mold through the cooling flow channel and the cavity, cooling of the fixed mold and the movable mold is accelerated, and therefore the pump cover is formed faster.

Description

Technical Field

[0001] The present invention relates to the technical field of metal casting, and particularly relates to a casting mold for a sewage pump and a casting method thereof. Background Art

[0002] A sewage pump is a device used for discharging, transporting or lifting sewage, and is usually used in places such as sewage treatment plants, sewage stations, urban drainage systems, etc. The sewage pump is mainly composed of a pump body, a pump cover, etc. Among them, the pump cover is manufactured through a mold. The mold includes a moving mold and a fixed mold. Metal solution is introduced into the cavity between the moving mold and the fixed mold. After cooling, the metal solution is cooled and formed. Then, the moving mold is moved away from the fixed mold, and the pump cover can be taken out.

[0003] During the use of the mold, the metal solution is located between the moving mold and the fixed mold, and the moving mold and the fixed mold are cooled by natural heat dissipation, so as to cool the metal solution between the moving mold and the fixed mold. The heat dissipation time is long and the efficiency is low, resulting in slow forming of the pump cover. Therefore, the present application provides a casting mold for a sewage pump and a casting method thereof to meet the requirements. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a casting mold for a sewage pump and a casting method thereof to solve the problem of slow forming of the pump cover.

[0005] To solve the above technical problem, the present invention provides the following technical solutions: A casting mold for a sewage pump includes a fixed mold and a moving mold. An annular chute is provided on the side of the moving mold close to the fixed mold. A hollow sleeve is slidably sleeved in the annular chute. A limiting ring is fixedly sleeved on the circumferential surface of the hollow sleeve. A spring is sleeved in the annular chute. A cavity is provided in the hollow sleeve. A plurality of air outlet holes are provided on the hollow sleeve. A connecting pipe communicating with the cavity is fixedly sleeved in the air outlet holes. A through groove communicating with the annular chute is provided on the side of the moving mold. The connecting pipe is located in the through groove and is communicated with a vacuum pump. A number of suction holes I and suction holes II are provided on the hollow sleeve; Cooling channels are provided in the fixed mold and the moving mold. A ring groove communicating with the cooling channels is formed on one side of the fixed mold close to the moving mold. Before mold closing, the hollow sleeve is partially located outside the annular chute under the elastic support of the spring, and both the first suction hole and the second suction hole are located outside the annular chute. The vacuum pump sucks air through the first suction hole and the second suction hole to clean the dust on the side where the fixed mold and the moving mold are close to each other and on the hollow sleeve. When the side of the hollow sleeve away from the moving mold fits with the fixed mold, a vertical groove is formed at the ring groove. A sealing disk is slidably connected in the vertical groove. A elastic piece is fixed between the sealing disk and the vertical groove. A guiding block is fixed on one side of the sealing disk close to the moving mold. A guiding groove is formed on one side of the moving mold close to the fixed mold. The sealing disk closes the first suction hole and the cooling channel on the moving mold. Under the operation of the vacuum pump, the casting cavity between the fixed mold and the moving mold is evacuated. During mold closing, the hollow sleeve is extruded by the moving mold into the annular chute, and the guiding block on the sealing disk is guided by the guiding groove to release the closing of the first suction hole and the cooling channel. The cooling channel is communicated with the first suction hole and the second suction hole. When the cooling metal solution forms the sewage pump cover, the vacuum pump sucks external air, and the sucked air cools the fixed mold and the moving mold through the cooling channel and the cavity.

[0006] Preferably, the hollow sleeve includes an inner ring and an outer ring slidably connected to the inner wall of the annular chute. A first ring is fixed to one end of the inner ring and the outer ring close to the fixed mold, and a second ring is fixed to one end of the inner ring and the outer ring away from the fixed mold. The inner ring, the outer ring, the first ring and the second ring together form the same cavity. A limiting plate is fixed on the circumferential surface of the outer ring at the position of the air outlet hole. The limiting plate is located in the through groove and between the connecting pipe and the limiting ring.

[0007] Preferably, each group of the first suction holes includes a first round hole and two second round holes formed on the first ring. The two second round holes are located on both sides of the first round hole, and the first round hole is arranged at a position close to the air outlet hole.

[0008] Preferably, an annular groove communicating with the first round hole and the second round holes is formed on the first ring.

[0009] Preferably, a square groove is formed on the inner wall of the annular groove.

[0010] Preferably, each group of the second suction holes includes a first T-shaped through hole and two second T-shaped through holes formed on the inner ring. The two second T-shaped through holes are located on both sides of the first T-shaped through hole, and the first T-shaped through hole is arranged at a position close to the air outlet hole.

[0011] Preferably, a plurality of flow guiding plates are fixed between the inner ring and the outer ring, and the adjacent flow guiding plates are located on both sides of the air outlet hole.

[0012] Preferably, the cooling channels include a first channel and a second channel, both of which are formed in the moving mold. The first channel and the second channel are connected to each other. A fourth channel and a fifth channel are formed in the fixed mold, and the fourth channel and the fifth channel are connected to each other. The openings of the second channel and the third channel gradually increase in the direction towards the second mounting plate, and the openings of the fifth channel gradually increase in the direction away from the fixed mold and perpendicular to the support rod.

[0013] Preferably, a first mounting plate is installed on the side of the fixed mold away from the moving mold, and a second mounting plate is installed on the side of the moving mold away from the fixed mold. A support rod is fixed on the side of the first mounting plate close to the second mounting plate, and the second mounting plate is movably sleeved on the surface of the support rod.

[0014] A casting method for a sewage pump, which is applied to a casting mold for a sewage pump as described above, includes the following steps: S1: Before closing the mold, connect the vacuum pump to the connecting pipe. After starting the vacuum pump, suction is formed at the first circular hole, the second circular hole, the annular groove and the square groove at the first ring, and the suction sucks the dust at the first ring into the hollow sleeve to clean it. Secondly, suction is also formed at the first T-shaped through hole and the second T-shaped through hole to clean the dust between the moving mold and the fixed mold. S2: During the process of the moving mold moving towards the fixed mold, the first ring and the limiting ring are inserted into the ring groove, and the air in the cavity between the moving mold and the fixed mold is sucked into the hollow sleeve through the suction at the first T-shaped through hole and the second T-shaped through hole to evacuate the cavity between the moving mold and the fixed mold. S3: After the moving mold is attached to the fixed mold, inject the molten metal into the moving mold and the fixed mold. Cool the molten metal by cooling the moving mold and the fixed mold through the cooling channels. When the pump cover is formed, move the moving mold away from the fixed mold and take out the pump cover. S4: When the moving mold moves away from the fixed mold, the spring drives the hollow sleeve to reset, and the elastic piece drives the sealing disc to reset. Then, the pump cover can be processed again.

[0015] Compared with the prior art, the present invention has at least the following beneficial effects: In the above solution, by setting the cooling channels and the hollow sleeve, when closing the mold, the cooling channels are connected to the hollow sleeve. When cooling the molten metal to form the sewage pump cover, the vacuum pump sucks the external air, and the sucked air cools the fixed mold and the moving mold through the cooling channels and the cavity, accelerating the cooling of the fixed mold and the moving mold, so that the pump cover can be formed faster.

[0016] By setting the hollow sleeve, before closing the mold, the vacuum pump sucks air through the first suction hole and the second suction hole to clean the dust on the side of the fixed mold and the moving mold close to each other and on the hollow sleeve, avoiding the presence of dust between the fixed mold and the moving mold, thus avoiding the existence of gaps between the fixed mold and the moving mold, making the fixed mold and the moving mold more sealed and preventing the molten metal from flowing out.

[0017] By providing a hollow sleeve, when the side of the hollow sleeve away from the moving mold fits with the fixed mold, under the operation of a vacuum pump, the casting cavity between the fixed mold and the moving mold is evacuated, making it easier for the molten metal to enter the casting cavity and achieving the effect of guiding the molten metal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings incorporated herein and constituting a part of the specification illustrate embodiments of the present disclosure and, together with the specification, are further used to explain the principles of the present disclosure and enable those skilled in the relevant art to implement and use the present disclosure.

[0019] Figure 1 FIG. 9 is an overall three-dimensional structural schematic diagram of a sewage pump casting mold and its casting method; Figure 2 FIG. 12 is a cross-sectional view of the moving mold and the fixed mold of a sewage pump casting mold and its casting method; Figure 3 FIG. 15 is an enlarged view of part A in FIG. 2 of a sewage pump casting mold and its casting method; Figure 4 FIG. 18 is a three-dimensional structural schematic diagram of a sealing disk and a guiding block of a sewage pump casting mold and its casting method; Figure 5 FIG. 21 is a three-dimensional structural schematic diagram of a hollow sleeve of a sewage pump casting mold and its casting method; Figure 6 FIG. 24 is a schematic diagram of the distribution state at the deflector of a sewage pump casting mold and its casting method; Figure 7 FIG. 27 is a structural schematic diagram of a first ring of a sewage pump casting mold and its casting method; Figure 8 FIG. 30 is a schematic diagram of the distribution state of a first T-shaped through hole and a second T-shaped through hole of a sewage pump casting mold and its casting method; Figure 9 FIG. 33 is a three-dimensional structural schematic diagram of a deflector of a sewage pump casting mold and its casting method.

[0020] [Reference Numerals] 1, first mounting plate; 2, second mounting plate; 3, support rod; 4, fixed mold; 5, moving mold; 6, annular chute; 7, spring; 8, through slot; 9, hollow sleeve; 901, inner ring; 902, outer ring; 903, first ring; 904, second ring; 905, air outlet hole; 906, connecting pipe; 907, first T-shaped through hole; 908, second T-shaped through hole; 909, first round hole; 910, second round hole; 911, annular groove; 912, square groove; 913, deflector; 10, cooling channel; 101, first channel; 102, second channel; 103, third channel; 104, fourth channel; 105, fifth channel; 11, limiting ring; 12, annular groove; 13, limiting plate; 14, sealing disk; 15, guiding block; 16, guiding groove.

[0021] As shown in the figure, in order to clearly implement the structure of the embodiments of the present invention, specific structures and devices are marked in the figure. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device, and environment. According to specific needs, those of ordinary skill in the art can adjust or modify these devices and environments, and the adjustments or modifications still fall within the scope of the appended claims. Detailed implementation manners

[0022] The following will describe in detail a sewage pump casting mold and its casting method provided by the present invention in conjunction with the accompanying drawings and specific embodiments. At the same time, it should be noted here that in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also adopt other alternative methods for implementation; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0023] It should be pointed out that in the specification, the mention of "an embodiment", "embodiments", "exemplary embodiments", "some embodiments", etc. indicates that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. Additionally, when combining embodiments to describe specific features, structures, or characteristics, the implementation of such features, structures, or characteristics in combination with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the relevant art.

[0024] Generally, terms can be understood at least in part from their use in the context. For example, at least in part depending on the context, the term "one or more" used herein can be used to describe any feature, structure, or characteristic in a singular sense, or can be used to describe a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood as not necessarily intended to convey a set of exclusive factors, but rather, at least in part depending on the context, allowing for the existence of other factors that may not be explicitly described.

[0025] As Figures 1-8 shown, an embodiment of the present invention provides a sewage pump casting mold, including a fixed mold 4 and a movable mold 5. There is an annular sliding groove 6 on the side of the movable mold 5 close to the fixed mold 4. A hollow sleeve 9 is slidably sleeved in the annular sliding groove 6. A limiting ring 11 is fixedly sleeved on the circumferential surface of the hollow sleeve 9. A spring 7 is sleeved in the annular sliding groove 6. A cavity is provided in the hollow sleeve 9. A plurality of air outlet holes 905 are opened on the hollow sleeve 9. A connecting pipe 906 communicating with the cavity is fixedly sleeved in the air outlet hole 905. A through groove 8 communicating with the annular sliding groove 6 is opened on the side of the movable mold 5. The connecting pipe 906 is located in the through groove 8 and is communicated with a vacuum pump. A number of suction holes one and suction holes two are opened on the hollow sleeve 9; A cooling channel 10 is provided in the fixed mold 4 and the moving mold 5. A ring groove 12 communicating with the cooling channel 10 is opened on one side of the fixed mold 4 close to the moving mold 5. Before mold closing, the hollow sleeve 9 is partially located outside the annular sliding groove 6 under the elastic support of the spring 7, and both the first suction hole and the second suction hole are located outside the annular sliding groove 6. The vacuum pump sucks air through the first suction hole and the second suction hole to clean the dust on the sides of the fixed mold 4 and the moving mold 5 that are close to each other and on the hollow sleeve 9. When the side of the hollow sleeve 9 away from the moving mold 5 fits with the fixed mold 4, a vertical groove is opened at the ring groove 12. A sealing disk 14 is slidably connected in the vertical groove. A elastic piece is fixed between the sealing disk 14 and the vertical groove. A guiding block 15 is fixed on one side of the sealing disk 14 close to the moving mold 5. A guiding groove 16 is opened on one side of the moving mold 5 close to the fixed mold 4. The sealing disk 14 closes the first suction hole and the cooling channel 10 on the moving mold 5. Under the operation of the vacuum pump, the casting cavity between the fixed mold 4 and the moving mold 5 is evacuated. During mold closing, the hollow sleeve 9 is squeezed by the moving mold 5 into the annular sliding groove 6. The guiding block 15 on the sealing disk 14 is guided by the guiding groove 16 to release the closing of the first suction hole and the cooling channel 10. The cooling channel 10 is communicated with the first suction hole and the second suction hole. When the cooling metal solution forms the sewage pump cover, the vacuum pump sucks external air, and the sucked air cools the fixed mold 4 and the moving mold 5 through the cooling channel 10 and the cavity.

[0026] As Figures 5-8 shown, in this embodiment, the hollow sleeve 9 includes an inner ring 901 and an outer ring 902 that are slidably connected to the inner wall of the annular sliding groove 6. A first ring 903 is fixed to one end of the inner ring 901 and the outer ring 902 close to the fixed mold 4. A second ring 904 is fixed to one end of the inner ring 901 and the outer ring 902 away from the fixed mold 4. The inner ring 901, the outer ring 902, the first ring 903 and the second ring 904 together form the same cavity. A limiting plate 13 is fixed on the circumferential surface of the outer ring 902 at the position of the air outlet 905. The limiting plate 13 is located in the through groove 8. The limiting plate 13 is located between the connecting pipe 906 and the limiting ring 11. By providing the limiting plate 13, the connecting pipe 906 is protected from hitting the through groove 8.

[0027] As Figures 5-7 shown, in this embodiment, each group of first suction holes each include a round hole one 909 and two round holes two 910 opened on the first ring 903. The two round holes two 910 are located on both sides of the round hole one 909. The round hole one 909 is arranged at a position close to the air outlet 905. The aperture of the round hole one 909 is larger than that of the round hole two 910. The round hole two 910 is away from the air outlet 905. After the round hole two 910 is smaller, the wind speed is greater, so that the suction force at the round hole two 910 and the round hole one 909 is approximately the same.

[0028] As Figures 5-7As shown, in this embodiment, an annular groove 911 communicating with the first round hole 909 and the second round hole 910 is formed in the first ring 903. The annular groove 911 increases the suction area and has a better dust cleaning effect.

[0029] As Figures 5-7 shown, in this embodiment, a square groove 912 is formed in the inner wall of the annular groove 911. The square groove 912 increases the suction area and has a better dust cleaning effect.

[0030] As Figure 5 and Figure 6 shown, in this embodiment, each group of the second suction holes includes a T-shaped through hole 907 and two T-shaped through holes 908 formed in the inner ring 901. The two T-shaped through holes 908 are located on both sides of the T-shaped through hole 907. The T-shaped through hole 907 is arranged at a position close to the air outlet 905. The size of the T-shaped through hole 907 is larger than that of the T-shaped through hole 908. After the T-shaped through hole 908 far from the air outlet 905 is smaller, the air velocity entering the T-shaped through hole 908 becomes larger, so that the suction at the T-shaped through hole 907 and the T-shaped through hole 908 is approximately the same.

[0031] As Figure 6 and Figure 8 shown, in this embodiment, a plurality of flow guiding plates 913 are fixed between the inner ring 901 and the outer ring 902. The adjacent flow guiding plates 913 are located on both sides of the air outlet 905. The flow guiding plates 913 divide the cavity in the hollow sleeve 9 into several parts. Each cavity includes a first round hole 909 and two second round holes 910, so that the suction at the two second round holes 910 is approximately the same as that at the first round hole 909.

[0032] As Figure 2 shown, in this embodiment, the cooling channel 10 includes a first channel 101 and a second channel 102. The shape of the first channel 101 is adapted to the outer shape of the moving mold 5 in the direction close to the fixed mold 4. The first channel 101 and the second channel 102 are both formed in the moving mold 5 and are communicated with each other for improving the cooling effect. A fourth channel 104 and a fifth channel 105 are formed in the fixed mold 4. The fourth channel 104 is adapted to the outer shape of the fixed mold 4 in the direction close to the moving mold 5. The fourth channel 104 and the fifth channel 105 are communicated with each other. The openings of the second channel 102 and the third channel 103 in the direction towards the second mounting plate 2 increase successively for increasing the air intake. The openings of the fifth channel 105 in the direction far from the fixed mold 4 and perpendicular to the support rod 3 increase successively for increasing the air intake.

[0033] As Figure 1As shown in the figure, in this embodiment, a first mounting plate 1 is installed on the side of the fixed mold 4 away from the movable mold 5, and a second mounting plate 2 is installed on the side of the movable mold 5 away from the fixed mold 4. A support rod 3 is fixed on the side of the first mounting plate 1 close to the second mounting plate 2. The second mounting plate 2 is movably sleeved on the surface of the support rod 3. The first mounting plate 1 is used to fix the fixed mold 4, and the second mounting plate 2 is used to fix the movable mold 5. The fixed mold 4 and the movable mold 5 are fixed on the die-casting machine frame through the support rod 3 and the second mounting plate 2.

[0034] A casting method for a sewage pump, which is applied to the above-mentioned casting mold for a sewage pump, includes the following steps: S1: Before mold clamping, connect the vacuum pump to the connecting pipe 906. After starting the vacuum pump, suction is formed at the round hole 909, round hole 910, annular groove 911 and square groove 912 at the first ring 903. The suction sucks the dust at the first ring 903 into the hollow sleeve 9 to clean it. Secondly, suction is also formed at the first T-shaped through hole 907 and the second T-shaped through hole 908 to clean the dust between the movable mold 5 and the fixed mold 4, avoiding the existence of dust between the fixed mold 4 and the movable mold 5, thereby avoiding the existence of gaps between the fixed mold 4 and the movable mold 5, making the fixed mold 4 and the movable mold 5 more sealed and preventing the metal solution from flowing out; S2: During the process of the movable mold 5 moving towards the fixed mold 4, the first ring 903 and the limit ring 11 are inserted into the annular groove 12. Through the suction at the first T-shaped through hole 907 and the second T-shaped through hole 908, the air in the cavity between the movable mold 5 and the fixed mold 4 is sucked into the hollow sleeve 9 to evacuate the cavity between the movable mold 5 and the fixed mold 4, making it easier for the metal solution to enter the casting cavity and having a guiding effect on the metal solution; S3: After the movable mold 5 is attached to the fixed mold 4, inject the metal solution into the movable mold 5 and the fixed mold 4. Cool the movable mold 5 and the fixed mold 4 through the cooling channels 10 to cool the metal solution. When the pump cover is formed, move the movable mold 5 away from the fixed mold 4 and take out the pump cover to accelerate the cooling of the fixed mold 4 and the movable mold 5, so that the pump cover can be formed faster; S4: When the movable mold 5 moves away from the fixed mold 4, the spring 7 drives the hollow sleeve 9 to reset, and the elastic piece drives the sealing disc 14 to reset. Then the pump cover processing can be carried out again.

[0035] Working principle: Before mold clamping, connect the vacuum pump to the connecting pipe 906. After starting the vacuum pump, suction is formed at the round hole 909, round hole 910, annular groove 911 and square groove 912 at the first ring 903. The suction sucks the dust at the first ring 903 into the hollow sleeve 9 to clean it. Secondly, suction is also formed at the first T-shaped through hole 907 and the second T-shaped through hole 908 to clean the dust between the movable mold 5 and the fixed mold 4; During the process of the moving mold 5 moving towards the fixed mold 4, the first ring 903 and the limiting ring 11 are inserted into the annular groove 12. Through the suction force at the first T-shaped through hole 907 and the second T-shaped through hole 908, the air in the cavity between the moving mold 5 and the fixed mold 4 is sucked into the hollow sleeve 9, and the cavity between the moving mold 5 and the fixed mold 4 is evacuated; After the moving mold 5 is attached to the fixed mold 4, the guiding block 15 drives the sealing disc 14 to open outwards through the guiding of the guiding groove 16, so that the multiple sets of fourth flow channels 104 are communicated with the first round hole 909 and the second round hole 910. Then, the external air enters the fixed mold 4 from the fifth flow channel 105. The air enters the fourth flow channel 104 through the fifth flow channel 105 and enters the hollow sleeve 9 from the fourth flow channel 104, thereby realizing the cooling of the fixed mold 4. And the hollow sleeve 9 moves into the annular sliding groove 6. At this time, the first T-shaped through hole 907 and the second T-shaped through hole 908 on the inner ring 901 are communicated with the first flow channel 101. Then, the external air enters the second flow channel 102 from the third flow channel 103, enters the first flow channel 101 from the second flow channel 102, and finally the air enters the hollow sleeve 9. When the air flows in the first flow channel 101 and the second flow channel 102, the moving mold 5 is cooled. At this time, the molten metal is introduced into the cavity between the moving mold 5 and the fixed mold 4. Through the cooling of the moving mold 5 and the fixed mold 4 by the cooling flow channels 10, the molten metal is cooled. After the pump cover is formed, the moving mold 5 is moved away from the fixed mold 4, and the pump cover is taken out; When the moving mold 5 moves away from the fixed mold 4, the spring 7 drives the hollow sleeve 9 to reset, and the elastic piece drives the sealing disc 14 to reset. Then, the processing of the pump cover can be carried out again.

[0036] The present invention covers any substitutions, modifications, equivalent methods and solutions made on the essence and scope of the present invention. In order to enable the public to have a thorough understanding of the present invention, specific details are described in detail in the above preferred embodiments of the present invention. However, those skilled in the art can fully understand the present invention without the description of these details.

[0037] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A sewage pump casting mold, comprising a fixed mold (4) and a movable mold (5), characterized in that: The movable mold (5) has an annular groove (6) on the side close to the fixed mold (4), a hollow sleeve (9) is slidably sleeved in the annular groove (6), a limit ring (11) is fixedly sleeved on the circumferential surface of the hollow sleeve (9), a spring (7) is sleeved in the annular groove (6), a cavity is arranged in the hollow sleeve (9), a plurality of air outlet holes (905) are provided on the hollow sleeve (9), a connecting pipe (906) connected to the cavity is fixedly sleeved in the air outlet hole (905), a through groove (8) connected to the annular groove (6) is provided on the side of the movable mold (5), the connecting pipe (906) is located in the through groove (8), the connecting pipe (906) is connected to a vacuum pump, and a plurality of suction holes 1 and 2 are provided on the hollow sleeve (9); The fixed mold (4) and the movable mold (5) are provided with cooling channels (10), and a ring groove (12) connected to the cooling channel (10) is provided on the side of the fixed mold (4) close to the movable mold (5). Before mold closing, the hollow sleeve (9) is partially located outside the ring groove (6) under the elastic support of the spring (7), and the suction hole 1 and the suction hole 2 are both located outside the ring groove (6). The vacuum pump sucks air through the first suction hole and the second suction hole to clean the dust on the side of the fixed mold (4) and the movable mold (5) close to each other and on the hollow sleeve (9). When the side of the hollow sleeve (9) away from the movable mold (5) is in contact with the fixed mold (4), a vertical groove is provided at the ring groove (12), and a sealing disk (14) is slidably connected in the vertical groove. A spring is fixed between the sealing disk (14) and the vertical groove. The sealing disk (14) is close to the movable mold (5). A guide block (15) is fixed on one side of the movable mold (5), and a guide groove (16) is provided on one side of the movable mold (5) close to the fixed mold (4). The sealing disk (14) seals the suction hole 1 and the cooling channel (10) on the movable mold (5). Under the operation of the vacuum pump, the casting cavity between the fixed mold (4) and the movable mold (5) is evacuated. When the molds are closed, the hollow sleeve (9) is squeezed into the annular groove (6) by the movable mold (5). The guide block (15) on the sealing disk (14) is guided by the guide groove (16) to release the sealing of the suction hole 1 and the cooling channel (10). The cooling channel (10) is connected with the suction hole 1 and the suction hole 2. When the metal solution is cooled to form the sewage pump cover, the vacuum pump sucks external air, and the sucked air cools the fixed mold (4) and the movable mold (5) through the cooling channel (10) and the cavity.

2. The sewage pump casting mold according to claim 1, characterized in that: The hollow sleeve (9) comprises an inner ring (901) and an outer ring (902) slidably connected to the inner wall of an annular sliding groove (6); a first circular ring (903) is fixed to one end of the inner ring (901) and the outer ring (902) close to the fixed mold (4); a second circular ring (904) is fixed to one end of the inner ring (901) and the outer ring (902) away from the fixed mold (4); the inner ring (901), the outer ring (902), the first circular ring (903) and the second circular ring (904) together constitute a same cavity; a limiting plate (13) is fixed to the circumferential surface of the outer ring (902) at the position of the air outlet (905); the limiting plate (13) is located in the through groove (8); and the limiting plate (13) is located between the connecting pipe (906) and the limiting ring (11).

3. The sewage pump casting mold according to claim 2, characterized in that: Each group of suction holes 1 comprises a circular hole 1 (909) and two circular holes 2 (910) opened on the circular ring 1 (903); the two circular holes 2 (910) are located on both sides of the circular hole 1 (909); and the circular hole 1 (909) is arranged at a position close to the air outlet hole (905).

4. The sewage pump casting mold according to claim 3, characterized in that: The circular ring 1 (903) is provided with an annular groove (911) which is connected to the circular hole 1 (909) and the circular hole 2 (910).

5. The sewage pump casting mold according to claim 4, characterized in that: The inner wall of the annular groove (911) is provided with a square groove (912).

6. The sewage pump casting mold according to claim 2, characterized in that: Each group of the suction holes 2 comprises a T-shaped through hole 1 (907) and two T-shaped through holes 2 (908) opened on the inner ring (901); the two T-shaped through holes 2 (908) are located on both sides of the T-shaped through hole 1 (907); and the T-shaped through hole 1 (907) is arranged at a position close to the air outlet hole (905).

7. The sewage pump casting mold according to claim 2, characterized in that: A plurality of guide plates (913) are fixed between the inner ring (901) and the outer ring (902), and adjacent guide plates (913) are located on both sides of the air outlet (905).

8. The sewage pump casting mold according to claim 1, characterized in that: The cooling channel (10) comprises a channel 1 (101) and a channel 2 (102), the channel 1 (101) and the channel 2 (102) are both provided in the movable mold (5), the channel 1 (101) and the channel 2 (102) are connected, the fixed mold (4) is provided with a channel 4 (104) and a channel 5 (105), the channel 4 (104) and the channel 5 (105) are connected, the openings of the channel 2 (102) and the channel 3 (103) increase in size in a direction toward the mounting plate 2 (2), and the opening of the channel 5 (105) increases in size in a direction away from the fixed mold (4) and perpendicular to the support rod (3).

9. The sewage pump casting mold according to claim 1, characterized in that: A mounting plate 1 (1) is installed on the side of the fixed mold (4) away from the movable mold (5), a mounting plate 2 (2) is installed on the side of the movable mold (5) away from the fixed mold (4), a support rod (3) is fixed on the side of the mounting plate 1 (1) close to the mounting plate 2 (2), and the mounting plate 2 (2) is movably sleeved on the surface of the support rod (3).

10. A method for casting a sewage pump, applied to a sewage pump casting mold as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: S1: Before closing the mold, connect the vacuum pump to the connecting pipe (906). After starting the vacuum pump, suction is formed at the circular hole 1 (909), the circular hole 2 (910), the annular groove (911) and the square groove (912) at the circular ring 1 (903). The suction draws the dust at the circular ring 1 (903) into the hollow sleeve (9) to clean it. Then, suction is also formed at the T-shaped through hole 1 (907) and the T-shaped through hole 2 (908) to clean the dust between the movable mold (5) and the fixed mold (4). S2: When the movable mold (5) moves toward the fixed mold (4), the circular ring (903) and the limit ring (11) are inserted into the annular groove (12), and the air in the cavity between the movable mold (5) and the fixed mold (4) is sucked into the hollow sleeve (9) through the suction force at the T-shaped through hole (907) and the T-shaped through hole (908), thereby evacuating the cavity between the movable mold (5) and the fixed mold (4); S3: After the movable mold (5) is attached to the fixed mold (4), the metal solution is injected into the movable mold (5) and the fixed mold (4), and the movable mold (5) and the fixed mold (4) are cooled by the cooling channel (10) to achieve cooling of the metal solution. When the pump cover is formed, the movable mold (5) is separated from the fixed mold (4) and the pump cover is taken out; S4: When the movable mold (5) moves away from the fixed mold (4), the spring (7) drives the hollow sleeve (9) to return to its original position, and the spring piece drives the sealing disk (14) to return to its original position, after which the pump cover can be processed again.

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