Sewage pump casting mold and casting method thereof

Abstract

The application provides a sewage pump casting mold and a casting method thereof, and belongs to the technical field of metal casting. The sewage pump casting mold comprises a fixed mold and a movable mold. An annular sliding groove is arranged on the side of the movable mold close to the fixed mold. A hollow sleeve is slidably sleeved in the annular sliding groove. A limiting ring is fixedly sleeved on the circumferential surface of the hollow sleeve. A spring is sleeved in the annular sliding groove. A cavity is arranged in the hollow sleeve. A plurality of gas outlets are formed in the hollow sleeve. A connecting pipe in communication with the cavity is fixedly sleeved in the gas outlets. A through groove in communication with the annular sliding groove is formed in the side of the movable mold. The connecting pipe is located in the through groove, and the connecting pipe is in communication with a vacuum pump. The cooling flow channel and the hollow sleeve are arranged. When the mold is closed, the cooling flow channel is in communication with the hollow sleeve. When the metal solution is cooled and the sewage pump cover is 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, accelerates the cooling of the fixed mold and the movable mold, and thus the cover is formed faster.

Description

Technical Field

[0001] This invention relates to the field of metal casting technology, and in particular to a sewage pump casting mold and its casting method. Background Technology

[0002] A sewage pump is a device used to discharge, transport, or lift sewage. It is commonly used in sewage treatment plants, sewage stations, and urban drainage systems. A sewage pump mainly consists of a pump body and a pump cover. The pump cover is manufactured using a mold, which includes a moving mold and a fixed mold. Molten metal is passed into the cavity between the moving mold and the fixed mold. After cooling, the molten metal solidifies. Then, the moving mold is moved away from the fixed mold, and the pump cover can be removed.

[0003] During use, the molten metal is located between the moving mold and the fixed mold. The molten metal between the moving mold and the fixed mold is cooled by natural heat dissipation. However, the heat dissipation time is long and the efficiency is low, resulting in slow pump cover forming. Therefore, this application provides a sewage pump casting mold and its casting method to meet the requirements. Summary of the Invention

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

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0006] A sewage pump casting mold includes a fixed mold and a moving mold. The moving mold has an annular groove on the side near the fixed mold. A hollow sleeve is slidably sleeved in the annular groove. A limit ring is fixedly sleeved on the circumference of the hollow sleeve. A spring is sleeved in the annular groove. A cavity is provided in the hollow sleeve. Multiple air outlets are opened on the hollow sleeve. A connecting pipe connected to the cavity is fixedly sleeved in the air outlet. A through groove is opened on the side of the moving mold, which is connected to the annular groove. The connecting pipe is located in the through groove and is connected to a vacuum pump. Several suction holes one and suction holes two are opened on the hollow sleeve.

[0007] Cooling channels are provided in both the fixed mold and the moving mold. An annular groove connected to the cooling channels is formed on the side of the fixed mold closest to the moving mold. Before mold closing, the hollow sleeve, supported by a spring, is partially located outside the annular groove. Both suction holes one and two are located outside the annular groove. A vacuum pump draws air through the first and second suction holes to clean dust from the side of the fixed mold and moving mold closest to each other, as well as from the hollow sleeve. When the side of the hollow sleeve furthest from the moving mold is in contact with the fixed mold, a vertical groove is formed in the annular groove. A sealing disc is slidably connected within the vertical groove, and a spring is fixed between the sealing disc and the vertical groove. A guide block is fixed near the moving mold side, and a guide groove is opened on the moving mold side near the fixed mold side. The sealing plate seals the suction hole one 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. When the mold is closed, the hollow sleeve is squeezed into the annular slide groove by the moving mold. The guide block on the sealing plate is guided by the guide groove to release the seal on the suction hole one and the cooling channel. The cooling channel is connected to the suction hole one and the suction hole two. When the molten metal is cooled to form the sewage pump cover, the vacuum pump draws in external air. The drawn air cools the fixed mold and the moving mold through the cooling channel and the cavity.

[0008] Preferably, the hollow sleeve includes an inner ring and an outer ring slidably connected to the inner wall of an annular groove. A first ring is fixed to the end of the inner ring and the outer ring near the fixed mold, and a second ring is fixed to the 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 to the circumferential surface of the outer ring at the position of the air outlet. The limiting plate is located in the through groove and between the connecting pipe and the limiting ring.

[0009] Preferably, each set of suction holes includes one circular hole and two circular holes on the ring, with the two circular holes located on both sides of the circular hole, and the circular hole is positioned near the air outlet.

[0010] Preferably, the first ring has an annular groove that communicates with the first and second circular holes.

[0011] Preferably, the inner wall of the annular groove is provided with a square groove.

[0012] Preferably, each set of suction holes includes one T-shaped through hole one and two T-shaped through holes two on the inner ring, with the two T-shaped through holes two located on both sides of the T-shaped through hole one, and the T-shaped through hole one positioned near the air outlet.

[0013] Preferably, a plurality of guide plates are fixed between the inner ring and the outer ring, with adjacent guide plates located on both sides of the air outlet.

[0014] Preferably, the cooling channel includes channel one and channel two, both of which are opened in the moving mold and are connected. Channel one and channel two are opened in the fixed mold and are connected. Channel four and channel five are opened in the fixed mold and are connected. The openings of channel two and channel three toward the mounting plate two increase sequentially, and the opening of channel five away from the fixed mold and perpendicular to the support rod increases sequentially.

[0015] Preferably, a mounting plate one is installed on the side of the fixed mold away from the moving mold, and a mounting plate two is installed on the side of the moving mold away from the fixed mold. A support rod is fixed on the side of the mounting plate one that is close to the mounting plate two, and the mounting plate two is movably sleeved on the surface of the support rod.

[0016] A method for casting a sewage pump, using a sewage pump casting mold as described above, includes the following steps:

[0017] S1: Before mold closing, connect the vacuum pump to the connecting pipe. After starting the vacuum pump, suction is formed at the first and second round holes, the annular groove and the square groove at one point of the ring. The suction draws the dust at one point of the ring into the hollow sleeve for cleaning. Then, suction is also formed at the first and second T-shaped through holes to clean the dust between the moving mold and the fixed mold.

[0018] 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. Through the suction force at the first and second T-shaped through holes, the air in the cavity between the moving mold and the fixed mold is drawn into the hollow sleeve, thus creating a vacuum in the cavity between the moving mold and the fixed mold.

[0019] S3: After the moving mold is attached to the fixed mold, the molten metal is injected into the moving mold and the fixed mold. The molten metal is cooled by the cooling channel. After the pump cover is formed, the moving mold is moved away from the fixed mold and the pump cover is removed.

[0020] S4: When the moving mold moves away from the fixed mold, the spring drives the hollow sleeve to reset, and the spring plate drives the sealing disc to reset. Then the pump cover can be processed again.

[0021] Compared with the prior art, the present invention has at least the following beneficial effects:

[0022] In the above scheme, by setting up cooling channels and hollow sleeves, the cooling channels are connected to the hollow sleeves when the mold is closed. When the molten metal is cooled to form the sewage pump cover, the vacuum pump draws in external air. The drawn air is cooled by the cooling channels and cavities to cool the fixed mold and the moving mold, thereby accelerating the cooling of the fixed mold and the moving mold and thus making the pump cover form faster.

[0023] By setting a hollow sleeve, before mold closing, the vacuum pump draws air through the first and second suction holes to clean the dust on the side of the fixed mold and the moving mold that are close to each other, as well as on the hollow sleeve. This avoids dust between the fixed mold and the moving mold, thus preventing gaps between them and making the fixed mold and the moving mold more sealed, preventing the molten metal from flowing out.

[0024] By setting a hollow sleeve, when the side of the hollow sleeve away from the moving mold is in contact with the fixed mold, the casting cavity between the fixed mold and the moving mold is evacuated under the operation of the vacuum pump, making it easier for the molten metal to enter the casting cavity and thus having a guiding effect on the molten metal. Attached Figure Description

[0025] The accompanying drawings, which are incorporated herein and form part of the specification, illustrate embodiments of the present disclosure and, together with the specification, further serve to explain the principles of the present disclosure and enable those skilled in the art to implement and use the present disclosure.

[0026] Figure 1 A schematic diagram of the overall three-dimensional structure of a sewage pump casting mold and its casting method;

[0027] Figure 2 Cross-sectional views of the moving and fixed mold sections of a sewage pump casting mold and its casting method;

[0028] Figure 3 Enlarged view of point A in section 2 of the sewage pump casting mold and its casting method;

[0029] Figure 4 A three-dimensional structural diagram of the sealing disc and guide block for a sewage pump casting mold and its casting method;

[0030] Figure 5 A schematic diagram of the three-dimensional structure of a hollow sleeve for casting molds and casting methods for sewage pumps;

[0031] Figure 6 A schematic diagram of the distribution of the guide plate in the casting mold and casting method for a sewage pump.

[0032] Figure 7 A schematic diagram of a circular structure for a sewage pump casting mold and its casting method;

[0033] Figure 8 A schematic diagram showing the distribution of T-shaped through holes one and two for a sewage pump casting mold and its casting method;

[0034] Figure 9 A schematic diagram of the three-dimensional structure of the guide plate for the casting mold and casting method of a sewage pump.

[0035] [Figure Labels]

[0036] 1. Mounting plate one; 2. Mounting plate two; 3. Support rod; 4. Fixed mold; 5. Moving mold; 6. Annular groove; 7. Spring; 8. Through groove; 9. Hollow sleeve; 901. Inner ring; 902. Outer ring; 903. Circular ring one; 904. Circular ring two; 905. Vent hole; 906. Connecting pipe; 907. T-shaped through hole one; 908. T-shaped through hole two; 909. Circular hole one; 910. Circular hole two; 911. Annular groove; 912. Square groove; 913. Guide plate; 10. Cooling channel; 101. Channel one; 102. Channel two; 103. Channel three; 104. Channel four; 105. Channel five; 11. Limiting ring; 12. Annular groove; 13. Limiting plate; 14. Sealing plate; 15. Guide block; 16. Guide groove.

[0037] As shown in the figure, specific structures and devices are labeled in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs, and such adjustments or modifications are still included in the scope of the appended claims. Detailed Implementation

[0038] The following is a detailed description of a sewage pump casting mold and its casting method provided by the present invention, with reference to the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; for some known technologies, those skilled in the art can also use other alternative methods to implement the invention; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0039] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0040] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0041] like Figures 1-8 As shown, an embodiment of the present invention provides a sewage pump casting mold, including a fixed mold 4 and a moving mold 5. An annular groove 6 is provided on the side of the moving mold 5 near 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 provided in the hollow sleeve 9. A plurality of air outlets 905 are provided on the hollow sleeve 9. A connecting pipe 906 connected to the cavity is fixedly sleeved in the air outlets 905. A through groove 8 connected to the annular groove 6 is provided on the side of the moving mold 5. The connecting pipe 906 is located in the through groove 8 and is connected to a vacuum pump. A plurality of suction holes one and suction holes two are provided on the hollow sleeve 9.

[0042] Cooling channels 10 are provided in the fixed mold 4 and the moving mold 5. An annular groove 12 connected to the cooling channel 10 is opened on the side of the fixed mold 4 near the moving mold 5. Before the mold is closed, the hollow sleeve 9 is partially located outside the annular slide groove 6 under the elastic support of the spring 7, and both suction holes one and two are located outside the annular slide groove 6. The vacuum pump draws 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 moving mold 5 that are close to each other, as well as on the hollow sleeve 9. When the side of the hollow sleeve 9 away from the moving mold 5 is in contact with the fixed mold 4, a vertical groove is opened at the annular groove 12. A sealing disc 14 is slidably connected in the vertical groove. A spring is fixed between the sealing disc 14 and the vertical groove. The sealing disc 14 is close to the moving mold 5. A guide block 15 is fixed on one side of mold 5. A guide groove 16 is opened on the side of moving mold 5 near fixed mold 4. Sealing plate 14 seals suction hole one and cooling channel 10 on moving mold 5. Under the operation of vacuum pump, the casting cavity between fixed mold 4 and moving mold 5 is evacuated. When the mold is closed, hollow sleeve 9 is squeezed into annular slide groove 6 by moving mold 5. The guide block 15 on sealing plate 14 is guided by guide groove 16 to release the seal on suction hole one and cooling channel 10. Cooling channel 10 is connected to suction hole one and suction hole two. When cooling metal solution to form sewage pump cover, vacuum pump draws in external air. The drawn air cools fixed mold 4 and moving mold 5 through cooling channel 10 and cavity.

[0043] like Figures 5-8 As shown, in this embodiment, the hollow sleeve 9 includes an inner ring 901 and an outer ring 902 slidably connected to the inner wall of the annular groove 6. A first ring 903 is fixed to the end of the inner ring 901 and the outer ring 902 near the fixed mold 4, and a second ring 904 is fixed to the 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 and between the connecting pipe 906 and the limiting ring 11. By setting the limiting plate 13, the connecting pipe 906 is protected to avoid the connecting pipe 906 from colliding with the through groove 8.

[0044] like Figures 5-7 As shown in this embodiment, each set of suction holes includes one circular hole 909 and two circular holes 910 formed on the circular ring 903. The two circular holes 910 are located on both sides of the circular hole 909. The circular hole 909 is set near the air outlet 905. The diameter of the circular hole 909 is larger than the diameter of the circular hole 910. The circular holes 910 are far away from the air outlet 905. The smaller the circular hole 910, the greater the wind speed, so that the suction force at the circular hole 910 is approximately the same as that at the circular hole 909.

[0045] like Figures 5-7 As shown, in this embodiment, an annular groove 911 is provided on the annular ring 903, which is connected to the annular hole 909 and the annular hole 910. The annular groove 911 increases the suction area and improves the dust removal effect.

[0046] like Figures 5-7 As shown, in this embodiment, a square groove 912 is provided on the inner wall of the annular groove 911. The square groove 912 increases the suction area and improves the dust removal effect.

[0047] like Figure 5 and Figure 6 As shown, in this embodiment, each set of suction holes includes one T-shaped through hole 907 and two T-shaped through holes 908 opened on 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 located near the air outlet 905. The size of the T-shaped through hole 907 is larger than the size of the T-shaped through hole 908. The smaller size of the T-shaped through hole 908, which is farther away from the air outlet 905, increases the wind speed of the air entering the T-shaped through hole 908, making the suction force at the T-shaped through hole 907 and the T-shaped through hole 908 approximately the same.

[0048] like Figure 6 and Figure 8 As shown, in this embodiment, a number of guide plates 913 are fixed between the inner ring 901 and the outer ring 902. The adjacent guide plates 913 are located on both sides of the air outlet 905. The guide plates 913 divide the cavity inside the hollow sleeve 9 into a number of cavities. Each cavity includes a first circular hole 909 and two second circular holes 910, so that the suction force at the two second circular holes 910 is approximately the same as that at the first circular hole 909.

[0049] like Figure 2As shown, in this embodiment, the cooling channel 10 includes channel one 101 and channel two 102. The shape of channel one 101 is adapted to the shape of the moving mold 5 in the direction close to the fixed mold 4. Channel one 101 and channel two 102 are both opened in the moving mold 5 and are connected to each other to improve the cooling effect. Channel four 104 and channel five 105 are opened in the fixed mold 4. Channel four 104 is adapted to the shape of the fixed mold 4 in the direction close to the moving mold 5 and is connected to each other. The openings of channel two 102 and channel three 103 toward the mounting plate two 2 increase sequentially to increase the amount of air entering. The openings of channel five 105 away from the fixed mold 4 and perpendicular to the support rod 3 increase sequentially to increase the amount of air entering.

[0050] like Figure 1 As shown, in this embodiment, a mounting plate 1 is installed on the side of the fixed mold 4 away from the moving mold 5, and a mounting plate 2 is installed on the side of the moving mold 5 away from the fixed mold 4. A support rod 3 is fixed on the side of the mounting plate 1 close to the mounting plate 2. The mounting plate 2 is movably sleeved on the surface of the support rod 3. The mounting plate 1 is used to fix the fixed mold 4, and the mounting plate 2 is used to fix the moving mold 5. The fixed mold 4 and the moving mold 5 are fixed on the die-casting machine frame by the support rod 3 and the mounting plate 2.

[0051] A method for casting a sewage pump, using the aforementioned sewage pump casting mold, includes the following steps:

[0052] S1: Before mold closing, connect the vacuum pump to the connecting pipe 906. After starting the vacuum pump, suction is formed at the circular hole 909, circular hole 910, annular groove 911 and square groove 912 at the circular ring 903. The suction draws the dust at the circular ring 903 into the hollow sleeve 9 for cleaning. Then, suction is also formed at the T-shaped through hole 907 and T-shaped through hole 908 to clean the dust between the moving mold 5 and the fixed mold 4, so as to avoid dust between the fixed mold 4 and the moving mold 5, thereby avoiding gaps between the fixed mold 4 and the moving mold 5, making the fixed mold 4 and the moving mold 5 more sealed, and preventing the molten metal from flowing out.

[0053] S2: During the movement of the moving mold 5 toward the fixed mold 4, the first ring 903 and the limiting ring 11 are inserted into the ring 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 moving mold 5 and the fixed mold 4 is drawn into the hollow sleeve 9, and the cavity between the moving mold 5 and the fixed mold 4 is evacuated, making it easier for the molten metal to enter the casting cavity and playing a guiding role for the molten metal.

[0054] S3: After the moving mold 5 is attached to the fixed mold 4, the molten metal is injected into the moving mold 5 and the fixed mold 4. The molten metal is cooled by the cooling channel 10. After the pump cover is formed, the moving mold 5 is moved away from the fixed mold 4 and the pump cover is removed to accelerate the cooling of the fixed mold 4 and the moving mold 5, thereby making the pump cover form faster.

[0055] S4: When the moving mold 5 moves away from the fixed mold 4, the spring 7 drives the hollow sleeve 9 to reset, and the spring plate drives the sealing disc 14 to reset. Then the pump cover can be processed again.

[0056] Working principle: Before mold closing, connect the vacuum pump to the connecting pipe 906. After starting the vacuum pump, suction is formed at the circular hole 909, circular hole 910, annular groove 911 and square groove 912 at the circular ring 903. The suction draws the dust at the circular ring 903 into the hollow sleeve 9 for cleaning. Then, suction is also formed at the T-shaped through hole 907 and T-shaped through hole 908 to clean the dust between the moving mold 5 and the fixed mold 4.

[0057] During the movement of the moving mold 5 toward the fixed mold 4, the first ring 903 and the limiting ring 11 are inserted into the ring 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 drawn into the hollow sleeve 9, thus creating a vacuum in the cavity between the moving mold 5 and the fixed mold 4.

[0058] After the moving mold 5 is attached to the fixed mold 4, the guide block 15, guided by the guide groove 16, drives the sealing disc 14 to open outward, so that multiple sets of flow channels 104 are connected to the first round hole 909 and the second round hole 910. Then, external air enters the fixed mold 4 through the fifth flow channel 105, and the air enters the fourth flow channel 104 through the fifth flow channel 105, and then enters the hollow sleeve 9 through the fourth flow channel 104 to cool the fixed mold 4. At this time, the hollow sleeve 9 moves into the annular slide groove 6, and the T-shaped through hole 907 and the T-shaped through hole 907 on the inner ring 901 are closed. Hole 2 908 is connected to flow channel 1 101. Then, external air enters flow channel 2 102 from flow channel 3 103 and then enters flow channel 1 101 from flow channel 2 102. Finally, the air enters the hollow sleeve 9. The air flows in flow channel 1 101 and flow channel 2 102 to cool the moving mold 5. At this time, the molten metal is introduced into the cavity between the moving mold 5 and the fixed mold 4. The molten metal is cooled by the cooling flow channel 10. After the pump cover is formed, the moving mold 5 is moved away from the fixed mold 4 and the pump cover is removed.

[0059] When the moving mold 5 moves away from the fixed mold 4, the spring 7 drives the hollow sleeve 9 to reset, and the spring plate drives the sealing disc 14 to reset. Then the pump cover can be processed again.

[0060] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details have been described in detail in the above preferred embodiments; however, those skilled in the art will fully understand this invention even without these detailed descriptions.

[0061] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A sewage pump casting mold, comprising a fixed mold (4) and a moving mold (5), characterized in that, The moving mold (5) has an annular groove (6) on the side near 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 provided in the hollow sleeve (9). Multiple air outlets (905) are opened on the hollow sleeve (9). A connecting pipe (906) connected to the cavity is fixedly sleeved in the air outlet (905). A through groove (8) connected to the annular groove (6) is opened on the side of the moving mold (5). The connecting pipe (906) is located in the through groove (8). The connecting pipe (906) is connected to the vacuum pump. Several suction holes one and suction holes two are opened on the hollow sleeve (9). Cooling channels (10) are provided in the fixed mold (4) and the moving mold (5). An annular groove (12) connected to the cooling channel (10) is opened on the side of the fixed mold (4) near the moving mold (5). Before the mold is closed, the hollow sleeve (9) is partially located outside the annular slide groove (6) under the elastic support of the spring (7). The first suction hole and the second suction hole are both located outside the annular slide groove (6). The vacuum pump draws 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 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) is in contact with the fixed mold (4), a vertical groove is opened at the annular groove (12). A sealing disc (14) is slidably connected in the vertical groove. A spring is fixed between the sealing disc (14) and the vertical groove. The sealing disc (14) is close to the vertical groove. A guide block (15) is fixed on one side of the moving mold (5). A guide groove (16) is opened on the side of the moving mold (5) close to the fixed mold (4). The sealing plate (14) seals the suction hole one 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. When the mold is closed, the hollow sleeve (9) is squeezed into the annular slide groove (6) by the moving mold (5). The guide block (15) on the sealing plate (14) is guided by the guide groove (16) to release the seal of the suction hole one and the cooling channel (10). The cooling channel (10) is connected to the suction hole one and the suction hole two. When the molten metal is cooled to form the sewage pump cover, the vacuum pump draws in the external air. The drawn air is cooled by the cooling channel (10) and the cavity to cool the fixed mold (4) and the moving mold (5).

2. The sewage pump casting mold according to claim 1, characterized in that, The hollow sleeve (9) includes an inner ring (901) and an outer ring (902) slidably connected to the inner wall of the annular groove (6). A first ring (903) is fixed to the inner ring (901) and the outer ring (902) near the fixed mold (4). A second ring (904) is fixed to 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) and between the connecting pipe (906) and the limiting ring (11).

3. The sewage pump casting mold according to claim 2, characterized in that, Each set of suction holes includes a first circular hole (909) and two second circular holes (910) opened on a first circular ring (903). The two second circular holes (910) are located on both sides of the first circular hole (909), and the first circular hole (909) is located near the air outlet (905).

4. The sewage pump casting mold according to claim 3, characterized in that, The first ring (903) has an annular groove (911) that communicates with the first hole (909) and the second hole (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 set of suction holes includes a T-shaped through hole one (907) and two T-shaped through holes two (908) opened on the inner ring (901). The two T-shaped through holes two (908) are located on both sides of the T-shaped through hole one (907), and the T-shaped through hole one (907) is located near the air outlet (905).

7. The sewage pump casting mold according to claim 2, characterized in that, Several 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) includes channel one (101) and channel two (102). Channel one (101) and channel two (102) are both opened in the moving mold (5). Channel one (101) and channel two (102) are connected. Channel four (104) and channel five (105) are opened in the fixed mold (4). Channel four (104) and channel five (105) are connected. The openings of channel two (102) and channel three (103) towards the mounting plate two (2) increase sequentially. The openings of channel five (105) away from the fixed mold (4) and perpendicular to the support rod (3) increase sequentially.

9. The sewage pump casting mold according to claim 1, characterized in that, Mounting plate 1 (1) is installed on the side of the fixed mold (4) away from the moving mold (5), and mounting plate 2 (2) is installed on the side of the moving mold (5) away from the fixed mold (4). Mounting plate 1 (1) is fixed with a support rod (3) on the side of mounting plate 2 (2), and 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 described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Before closing the mold, connect the vacuum pump to the connecting pipe (906). After starting the vacuum pump, suction is formed at the first round hole (909), the second round hole (910), the annular groove (911), and the square groove (912) at the first ring (903). The suction draws the dust at the first ring (903) into the hollow sleeve (9) to clean it. Then, 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 moving mold (5) and the fixed mold (4). S2: During the movement of the moving mold (5) toward the fixed mold (4), the first ring (903) and the limiting ring (11) are inserted into the ring 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 drawn into the hollow sleeve (9), and the cavity between the moving mold (5) and the fixed mold (4) is evacuated. S3: After the moving mold (5) is attached to the fixed mold (4), the molten metal is injected into the moving mold (5) and the fixed mold (4). The molten metal is cooled by the cooling channel (10). After the pump cover is formed, the moving mold (5) is moved away from the fixed mold (4) and the pump cover is removed. S4: When the moving mold (5) moves away from the fixed mold (4), the spring (7) drives the hollow sleeve (9) to reset, and the spring plate drives the sealing disc (14) to reset. Then the pump cover can be processed again.

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