A motor rotor squirrel cage low-pressure copper casting equipment

Abstract

The invention belongs to the technical field of copper casting, and specifically relates to a low-pressure copper casting device for a motor rotor cage, comprising: a filtering device is included inside a crucible, a shell is arranged below a liquid riser, and a plurality of through slots are provided on a lower cover plate of the shell; a filter plate is fixedly matched with the through slots on the lower cover plate to preliminarily filter a molten liquid; a filter screen passes through an upper cover plate of the shell, and a lower end of the filter screen is fixedly connected to an inner bottom end of the shell, and a width does not exceed a width of the through slots, so as to ensure that the molten liquid after the preliminary filtration will not directly flow into the inside of the filter screen; an outer wall of a retaining ring is fixedly connected to an inner wall of the shell, and an inner wall of the retaining ring is fixedly connected to the filter screen; a fixed rod is slidably connected to an inner wall of the filter screen, and the invention provides a filtering device so that the molten liquid passes through the filtering device to achieve four filtrations, thereby reducing particulate impurities in the molten liquid and improving the casting quality of the motor rotor cage.

Description

Technical Field

[0001] The invention belongs to the technical field of copper casting, and in particular relates to a motor rotor squirrel cage low-pressure copper casting equipment. Background Art

[0002] A squirrel cage motor refers to a three-phase asynchronous motor whose rotor winding is not made of insulated wires, but is welded from aluminum bars or copper bars and short-circuit rings. The stator of the squirrel cage motor is a three-phase inlaid distributed winding, and the rotor is a squirrel cage conductor. When three-phase alternating current is applied to the stator winding of the motor, a rotating magnetic field will be formed. The closed conductor bars on the motor rotor cut the magnetic lines of force of the stator magnetic field, and induce electromotive force and current. The conductor to which alternating current is applied will move in the magnetic field, which will drive the motor rotor to rotate.

[0003] Low-pressure casting is a casting method in which the molten liquid completes the filling of the mold cavity and the solidification process under the action of pressure to obtain a casting. Because the pressure used is relatively low, it is called low-pressure casting. The process is: dry compressed air is introduced into a sealed crucible (or sealed tank). Under the action of gas pressure, the molten liquid rises along the riser pipe into the sprue, and smoothly enters the mold cavity through the ingrowth, and maintains the gas pressure on the liquid surface in the crucible until the casting is completely solidified. Then the gas pressure on the liquid surface is released to allow the unsolidified molten liquid in the riser to flow back to the crucible, and then the mold is opened and the casting is taken out.

[0004] However, the existing low-pressure copper casting equipment allows the molten liquid to enter the mold cavity through a riser pipe under the action of compressed air. Since the upper layer of the molten liquid is affected by the temperature of the compressed air, slag will be produced. The particulate impurities or slag contained in the molten liquid enter the mold cavity of the casting model with the molten liquid, which will cause the cast casting to produce slag inclusions, thereby affecting the casting quality of the motor rotor cage. Summary of the invention

[0005] The object of the present invention is to provide a low-pressure copper casting equipment for a motor rotor cage. The specific problem to be solved by the present invention is that the existing low-pressure copper casting equipment allows the molten liquid to enter the mold cavity through a riser pipe under the action of compressed air. Since the upper layer of the molten liquid is affected by the temperature of the compressed air, oxidized slag will be produced. The particulate impurities or oxidized slag contained in the molten liquid enter the mold cavity of the casting model with the molten liquid, thereby causing the cast casting to produce oxidized slag, thereby affecting the casting quality of the motor rotor cage.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A motor rotor squirrel cage low-pressure copper casting equipment, comprising:

[0008] Holding furnace;

[0009] A crucible, wherein the crucible is arranged inside the insulation furnace, and the bottom of the crucible is fixedly connected to the insulation furnace;

[0010] A liquid riser pipe, the liquid riser pipe passes through the upper end of the holding furnace;

[0011] A casting model, wherein the casting model is divided into two sections, an upper section and an lower section, and the lower end of the casting model is fixedly connected to the upper end of the holding furnace;

[0012] The interior of the crucible includes:

[0013] A filtering device, comprising:

[0014] A shell, the shell is arranged below the liquid riser, and a plurality of through grooves are provided on a lower cover plate of the shell;

[0015] A filter plate, the filter plate is fixedly matched with the through groove on the lower cover plate to initially filter the molten liquid;

[0016] A filter screen, wherein the filter screen passes through the upper cover plate of the housing, the lower end of the filter screen is fixedly connected to the bottom end of the housing, and the width of the filter screen does not exceed the width of the through slot, so as to ensure that the molten liquid after the preliminary filtration does not directly flow into the interior of the filter screen;

[0017] A retaining ring, wherein the outer wall of the retaining ring is fixedly connected to the inner wall of the shell, and the inner wall of the retaining ring is fixedly connected to the filter screen;

[0018] A fixing rod is slidably and sealingly connected to the inner wall of the filter screen.

[0019] Preferably, the insulation furnace is provided with:

[0020] A feeding pipe is provided, wherein the feeding pipe is obliquely penetrated through the holding furnace and the crucible so that the molten liquid enters the interior of the crucible.

[0021] Preferably, the insulation furnace is provided with:

[0022] An air inlet pipe, which runs through the holding furnace and has a horizontal length not exceeding that of the crucible, with the pipe opening facing downwards;

[0023] The air outlet is arranged at the lower end of the insulation furnace, and a pressure control valve is connected below the air outlet to control the size of the air outlet pressure to ensure that the pressure output by the air inlet pipeline is always greater than the pressure of the air outlet.

[0024] Preferably, grooves A are provided on the outer walls of both sides of the liquid riser above the crucible, and bearings are fixedly connected to the grooves A;

[0025] The inner walls of both sides of the insulation furnace are provided with grooves B, and the grooves B are fixedly connected with bearings;

[0026] A rotating rod, the outer wall of which is rotatably connected to the bearing;

[0027] The fan is arranged below the pipe opening of the air inlet duct, and the fan is fixedly connected to the outer wall of the rotating rod.

[0028] Preferably, the bottom end of the crucible is fixedly connected with:

[0029] A spring telescopic rod, wherein the spring telescopic rod is used to support the shell.

[0030] Preferably, a cam is fixedly connected to the outer wall of the rotating rod;

[0031] A moving rod, wherein the bottom end of the moving rod is fixedly connected to the upper end of the housing, and the upper end of the moving rod is rollingly connected to the cam;

[0032] A sleeve is provided at the lower end of the shell;

[0033] The fixing rod comprises:

[0034] A sleeve rod, the outer wall of which is slidably and sealingly connected with the inner wall of the sleeve;

[0035] A push rod, the push rod is slidably and sealingly connected to the inner wall of the filter screen;

[0036] The middle rod has a steel brush on its outer wall for cleaning impurities on the inner wall of the filter.

[0037] Preferably, the upper part of the housing is fixedly connected with:

[0038] A moving ring, wherein an annular groove is formed on the moving ring;

[0039] The boss is a hollow structure inside, the outer wall of the boss is slidably and sealingly connected to the annular groove, and the inner wall of the boss is fixedly connected to the outer wall of the liquid riser.

[0040] Preferably, the casting mold is provided with a through opening inside for connecting the riser pipe with the cavity so that the molten liquid can enter the cavity;

[0041] A hydraulic device is arranged above the casting model.

[0042] Preferably, there is a gap between the A groove and the rotating rod, and between the B groove and the rotating rod.

[0043] Preferably, the fan, movable rod, housing, filter plate, filter screen and movable ring are all made of lightweight and high temperature resistant materials, and the remaining materials in the insulation furnace are all heat resistant materials.

[0044] Compared with the prior art, the present invention has the following beneficial effects:

[0045] 1. The present invention provides a filtering device, and the molten liquid is filtered four times by the filtering device, thereby reducing the particulate impurities or oxidized slag in the molten liquid entering the mold cavity of the casting model with the molten liquid, thereby reducing the phenomenon of oxidized slag inclusions in the cast casting, and further improving the quality of the motor rotor cage casting.

[0046] 2. The present invention provides a steel brush, and through the up and down relative movement of the steel brush and the boiler net, the impurities on the inner wall of the filter net are cleaned to keep the filter net unobstructed. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] Figure 1 It is a direct diagram of the present invention;

[0048] Figure 2 It is a front cross-sectional view of the present invention;

[0049] Figure 3 For the present invention Figure 2 A magnified view of point I;

[0050] Figure 4 For the present invention Figure 2 The enlarged view of II;

[0051] Figure 5 For the present invention Figure 2 The enlarged view of point III;

[0052] Figure 6 It is a top view of the housing of the present invention.

[0053] In the figure: a holding furnace 1, a feed pipe 11, an air inlet pipe 12, an air outlet 13, a pressure control valve 131, a B groove 14, a crucible 2, a spring telescopic rod 21, a riser pipe 3, an A groove 31, a bearing 32, a boss 33, a casting model 4, a through port 41, a cavity 42, a filtering device 5, a shell 51, a moving rod 511, a sleeve 512, a through groove 52, a filter plate 53, a filter screen 54, a retaining ring 55, a fixing rod 6, a sleeve rod 61, a push rod 62, an intermediate rod 63, a rotating rod 7, a fan 71, a cam 72, a moving ring 8, an annular groove 81, and a hydraulic device 9. DETAILED DESCRIPTION

[0054] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0055] The embodiment of the present invention provides a motor rotor cage low-pressure copper casting equipment, which solves the problem that the existing low-pressure copper casting equipment of the present invention allows the molten liquid to enter the mold cavity through a riser pipe under the action of compressed air, and the upper layer of the molten liquid is affected by the temperature of the compressed air to produce oxidized slag. The particulate impurities or oxidized slag contained in the molten liquid enter the mold cavity of the casting model with the molten liquid, thereby causing the cast casting to produce oxidized slag, thereby affecting the casting quality of the motor rotor cage.

[0056] The technical solution in the embodiment of the present invention is to solve the above-mentioned technical problems. The overall idea is as follows: the molten liquid first passes through the filter plate and flows into the inner wall of the shell and the outer wall of the filter net, and between the baffle ring and the lower cover plate of the shell to achieve preliminary filtration. Then the molten liquid passes through the filter net to achieve secondary, tertiary and fourth filtration, and finally flows into the liquid riser.

[0057] To better understand the above technical solutions, please refer to Figures 1 to 6 In an embodiment of the present invention, a motor rotor squirrel cage low-pressure copper casting device comprises:

[0058] Holding furnace 1;

[0059] A crucible 2, wherein the crucible 2 is arranged inside the insulation furnace 1, and the bottom of the crucible 2 is fixedly connected to the insulation furnace 1;

[0060] A liquid riser 3, wherein the liquid riser 3 passes through the upper end of the holding furnace 1;

[0061] A casting model 4, wherein the casting model 4 is divided into two sections, an upper section and an lower section, and the lower end of the casting model 4 is fixedly connected to the upper end of the holding furnace 1;

[0062] Crucible 2 includes:

[0063] The filter device 5 comprises:

[0064] A shell 51, wherein the shell 51 is disposed below the liquid riser 3, and a plurality of through slots 52 are formed on a lower cover plate of the shell 51;

[0065] A filter plate 53, which is disposed inside the through groove 52 and is used for preliminary filtering of the molten liquid;

[0066] A filter screen 54, wherein the filter screen 54 passes through the upper cover plate of the housing 51, the lower end of the filter screen 54 is fixedly connected to the bottom end of the housing 51, and the width of the filter screen 54 does not exceed the width of the through slot 52, so as to ensure that the molten liquid after the preliminary filtration does not directly flow into the filter screen 54;

[0067] A retaining ring 55, wherein the outer wall of the retaining ring 55 is fixedly connected to the inner wall of the housing 51, and the inner wall of the retaining ring 55 is fixedly connected to the filter screen 54;

[0068] The fixing rod 6 is slidably connected to the inner wall of the filter screen 54 .

[0069] The present invention filters impurities in the molten liquid. The molten liquid enters the crucible 2. The molten liquid gradually rises due to the air pressure. It first passes through the filter plate 53 and flows into the inner wall of the shell 51 and the outer wall of the filter screen 54, and between the retaining ring 55 and the lower cover plate of the shell 51 to achieve preliminary filtration. Then the molten liquid passes through the filter screen 54 and flows into the inside of the filter screen 54 and below the fixed rod 6 to achieve secondary filtration. Then it passes through the filter screen 54 and flows into the inner wall of the shell 51 and the outer wall of the filter screen 54, and between the retaining ring 55 and the upper cover plate of the shell 51 to achieve tertiary filtration. Finally, the molten liquid passes through the filter screen 54 and flows into the inside of the filter screen 54 and above the fixed rod 6 to achieve further filtration, and finally flows into the riser 3.

[0070] Compared with traditional low-pressure casting, the present invention reduces the particle impurities or oxide slag in the molten liquid entering the cavity 42 of the casting model 4 with the molten liquid, thereby reducing the phenomenon of oxide slag inclusions in the cast casting, and at the same time the quality of the motor rotor cage casting is improved.

[0071] As a specific embodiment of the present invention, the insulation furnace 1 is externally provided with:

[0072] The feeding pipe 11 obliquely penetrates the holding furnace 1 and the crucible 2 so that the molten liquid enters the crucible 2 .

[0073] Before casting the squirrel cage motor rotor, the molten liquid is first poured into the crucible 2 through the feeding pipe 11. The feeding pipe 11 is tilted to pass through the insulation furnace 1 and the crucible 2 to facilitate the molten liquid to enter the crucible 2. The tilting can speed up the circulation of the liquid, save the feeding time, and prevent the molten liquid from flowing back and causing harm to the staff.

[0074] As a specific embodiment of the present invention, the insulation furnace 1 is provided with:

[0075] An air inlet pipe 12, the air inlet pipe 12 passes through the holding furnace 1, and the horizontal length thereof shall not exceed the crucible 2, and the pipe opening faces downward;

[0076] The gas outlet 13 is arranged at the lower end of the holding furnace 1, and a pressure control valve 131 is connected below the gas outlet 13 to control the pressure of the gas outlet 13 to ensure that the pressure output by the air inlet pipe 12 is always greater than the pressure of the gas outlet 13;

[0077] The molten liquid enters the crucible 2, and the air compressor is started. The compressed air flows into the holding furnace 1 through the air inlet pipe 12, with the pipe mouth facing downward, so that the airflow brought by the compressed air blows toward the bottom of the holding furnace 1. The pressure control valve 131 is connected below the air outlet 13 to control the pressure at the air outlet 13 to ensure that the pressure output by the air inlet pipe 12 is always greater than the pressure at the air outlet 13. Part of the air pressure flows into the crucible 2, and the other part of the air pressure flows to the air outlet 13, so that the airflow inside the holding furnace 1 can circulate; ensuring that some components in the holding furnace 1 can work normally.

[0078] As a specific embodiment of the present invention, the outer walls of both sides of the liquid riser 3 above the crucible 2 are provided with A grooves 31, and the A grooves 31 are fixedly connected with bearings 32;

[0079] The inner walls of both sides of the heat preservation furnace 1 are provided with B grooves 14, and the B grooves 14 are fixedly connected with bearings 32;

[0080] A rotating rod 7, wherein the outer wall of the rotating rod 7 is rotatably connected to the bearing 32;

[0081] The fan 71 is disposed below the opening of the air inlet duct 12 , and the fan 71 is fixedly connected to the outer wall of the rotating rod 7 .

[0082] A groove 31 is provided on the outer wall of both sides of the riser tube 3 above the crucible 2, and the A groove 31 is fixedly connected with a bearing 32. B grooves 14 are provided on the inner walls of both sides of the insulation furnace 1, and the B grooves 14 are fixedly connected with a bearing 32. The outer wall of the rotating rod 7 is rotatably connected with the bearing 32. The bearing 32 is connected with the groove, which reduces the friction between the rotating rod 7 and the insulation furnace 1, and the rotating rod 7 and the riser tube 3, and improves the service life. The air pressure flows to drive the fan 71 to rotate, and at the same time, the fan 71 drives the rotating rod 7 to rotate, providing power for the up and down movement of the filtering device 5.

[0083] As a specific embodiment of the present invention, the bottom end of the crucible 2 is fixedly connected with:

[0084] The spring telescopic rod 21 is used to support the housing 51 .

[0085] During the filtering process, the housing 51 is in a suspended state, and the housing 51 is supported by a spring compression rod, thereby ensuring the stability of the movement process.

[0086] As a specific embodiment of the present invention, the outer wall of the rotating rod 7 is fixedly connected with a cam 72;

[0087] A moving rod 511, wherein the bottom end of the moving rod 511 is fixedly connected to the upper end of the housing 51, and the upper end of the moving rod 511 is rollingly connected to the cam 72;

[0088] The lower end of the housing 51 is provided with a sleeve 512;

[0089] The fixing rod 6 comprises:

[0090] A sleeve rod 61, the outer wall of the sleeve rod 61 is slidably and sealingly connected with the inner wall of the sleeve 512;

[0091] A push rod 62, wherein the push rod 62 is slidably connected to the inner wall of the filter screen 54;

[0092] The middle rod 63 has a steel brush on its outer wall for cleaning impurities on the inner wall of the filter screen 54 .

[0093] The rotating rod 7 rotates, driving the cam 72 to rotate, and the upper end of the moving rod 511 is rollingly connected to the cam 72. Due to the action of the spring telescopic rod 21, the moving rod 511 is driven to reciprocate up and down. At this time, the shell 51 also reciprocates up and down. A sleeve 512 is provided at the lower end of the shell 51. The outer wall of the sleeve rod 61 is slidably and sealedly connected with the inner wall of the sleeve 512, so that the sleeve 512 reciprocates up and down along the sleeve rod 61 during movement, playing a guiding role. As the shell 51 moves up and down, since the steel brush is fixed on the fixed rod 6, and the fixed rod 6 is fixed to the bottom of the crucible 2, the steel brush will move relative to the filter 54 to clean the impurities on the inner wall of the filter 54.

[0094] A heat insulating layer is provided in the inner wall of the outer shell of the spring telescopic rod 21, so that the temperature of the spring in the spring telescopic rod 21 is lower than the temperature of the molten liquid, so that the spring can work normally;

[0095] For example: Figure 2 When the cam 72 is in the moving state, the cam 72 continues to rotate. At this time, the cam 72 presses the moving rod 511 downward, compresses the spring telescopic rod 21, the middle retracted rod moves downward, the shell 51 also moves downward, and the steel brush starts to clean the inner wall below the filter 54 to keep the filter 54 unobstructed. After the cam 72 contacts the moving rod 511 at the highest position, the cam 72 continues to rotate. At this time, the spring telescopic rod 21 rebounds, the moving rod 511 moves upward, the shell 51 also moves downward, and the steel brush starts to clean the inner wall above the filter 54 to make the filter 54 more unobstructed.

[0096] As a specific embodiment of the present invention, the housing 51 is fixedly connected with:

[0097] A moving ring 8, wherein an annular groove 81 is formed on the moving ring 8;

[0098] The boss 33 has a hollow structure inside, the outer wall of the boss 33 is slidably and sealingly connected to the annular groove 81, and the inner wall of the boss 33 is fixedly connected to the outer wall of the liquid riser 3.

[0099] During the up and down reciprocating movement of the shell 51, the movable ring 8 also moves up and down along the side wall of the boss 33. The inner wall of the boss 33 is fixedly connected to the outer wall of the riser tube 3, so that the unfiltered molten liquid will not directly flow into the interior of the riser tube 3, thereby causing the cast casting to produce oxidized slag, thereby ensuring the casting quality.

[0100] As a specific embodiment of the present invention, the casting model 4 is provided with a through hole 41 inside, which is used to connect the riser pipe 3 with the cavity 42, so that the molten liquid can enter the cavity 42;

[0101] A hydraulic device 9 is provided above the casting mold 4 .

[0102] A through opening 41 is provided inside the casting model 4 to connect the riser pipe 3 with the cavity 42 so that the molten liquid can enter the cavity 42. After the model is formed, the hydraulic device 9 above the casting model 4 is driven to move the upper section of the casting model 4 upward, and finally the model is taken out.

[0103] As a specific implementation of the present invention, there is a gap between the A groove 31 and the rotating rod 7, and between the B groove 14 and the rotating rod 7.

[0104] Gaps are left between the A groove 31 and the rotating rod 7 , and between the B groove 14 and the rotating rod 7 , in order to reduce the friction between the bottom surface of the rotating rod 7 and the grooves, thereby increasing the service life of the rotating rod 7 .

[0105] As a specific embodiment of the present invention, the fan 71, the moving rod 511, the shell 51, the filter plate 53, the filter screen 54 and the moving ring 8 are all made of lightweight and high temperature resistant materials, and the remaining materials in the insulation furnace 1 are all heat resistant materials.

[0106] The temperature of the molten liquid is as high as 1083.4°C. The fan 71, moving rod 511, shell 51, filter plate 53, filter screen 54 and moving ring 8 are all made of lightweight and high-temperature resistant materials, such as zirconium oxide, with a melting point of 2680°C, so that the parts can easily realize their respective movements. The remaining materials in the insulation furnace 1 are all heat-resistant materials, such as modulated steel, with a melting point of 1500°C, which is higher than the temperature of the molten liquid, so that the materials can work normally at high temperatures.

[0107] Working principle: Before casting the squirrel cage motor rotor, the molten liquid is first poured into the crucible 2 through the feed pipe 11. After the molten liquid enters the crucible 2, the air compressor is started, and the compressed air flows into the holding furnace 1 through the air inlet pipe 12. Part of the air pressure flows into the crucible 2, and the other part of the air pressure flows to the air outlet 13. The molten liquid will gradually rise due to the air pressure. At this time, it first passes through the filter plate 53 and flows into the inner wall of the shell 51 and the outer wall of the filter screen 54, and between the retaining ring 55 and the lower cover plate of the shell 51 to achieve preliminary filtration. Then the molten liquid passes through the filter screen 54 and flows into the filter screen 54. , below the fixed rod 6, secondary filtration is achieved, and then the molten liquid passes through the filter screen 54 and flows into the inner wall of the shell 51 and the outer wall of the filter screen 54, and between the retaining ring 55 and the upper cover plate of the shell 51 to achieve tertiary filtration. Finally, the molten liquid passes through the filter screen 54 and flows into the inside of the filter screen 54, above the fixed rod 6, and is filtered again, and finally flows into the riser pipe 3. The riser pipe 3 and the cavity 42 are connected by the through port 41, so that the molten liquid can enter the cavity 42. After the model is formed, the hydraulic device 9 above the casting model 4 is driven to drive the upper section of the casting model 4 to move upward, and finally the model is taken out.

[0108] The technical features of the above embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not exist, the above embodiments only express several implementation methods of the present invention. The description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, without departing from the concept of the present invention, several variations and improvements can be made, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A motor rotor squirrel cage low-pressure copper casting equipment, include: Holding furnace (1); A crucible (2), wherein the crucible (2) is arranged inside the heat-insulating furnace (1), and the bottom of the crucible (2) is fixedly connected to the heat-insulating furnace (1); A liquid riser (3), wherein the liquid riser (3) passes through the upper end of the holding furnace (1); A casting model (4), wherein the casting model (4) is divided into two sections, an upper section and an lower section, and the lower end of the casting model (4) is fixedly connected to the upper end of the insulation furnace (1); The crucible (2) is characterized in that the interior thereof comprises: A filtering device (5), wherein the filtering device (5) comprises: A shell (51), the shell (51) being arranged below the liquid riser (3), and a plurality of through slots (52) being provided on a lower cover plate of the shell (51); A filter plate (53), wherein the filter plate (53) is fixedly matched with the through groove (52) on the lower cover plate and is used for preliminary filtering of the molten liquid; A filter screen (54), wherein the filter screen (54) penetrates the upper cover plate of the shell (51), the lower end of the filter screen (54) is fixedly connected to the bottom end of the shell (51), and the width of the filter screen (54) does not exceed the width of the through groove (52), so as to ensure that the molten liquid after preliminary filtration does not directly flow into the inside of the filter screen (54); a retaining ring (55), the outer wall of the retaining ring (55) being fixedly connected to the inner wall of the housing (51), and the inner wall of the retaining ring (55) being fixedly connected to the filter screen (54); a fixing rod (6), the fixing rod (6) being slidably and sealingly connected to the inner wall of the filter screen (54); Before casting the squirrel cage motor rotor, the molten liquid is first poured into the crucible (2) through the feed pipe (11). After the molten liquid enters the crucible (2), the air compressor is started, and the compressed air flows into the holding furnace (1) through the air intake pipe (12). Part of the air pressure flows into the crucible (2), and the other part of the air pressure flows to the air outlet (13). The molten liquid will gradually rise due to the air pressure. At this time, it first passes through the filter plate (53) and flows into the inner wall of the shell (51) and the outer wall of the filter screen (54), and between the retaining ring (55) and the lower cover plate of the shell (51) to achieve preliminary filtration. Then, the molten liquid passes through the filter screen (54) and flows into the filter screen (54). The fixing rod ( 6), to achieve secondary filtration, and then flow through the filter screen (54) into the inner wall of the housing (51) and the outer wall of the filter screen (54), between the retaining ring (55) and the upper cover plate of the housing (51), to achieve tertiary filtration. Finally, the molten liquid flows through the filter screen (54) into the interior of the filter screen (54), above the fixing rod (6), to be filtered again, and finally flows into the liquid riser (3). The liquid riser (3) and the mold cavity (42) are connected by the through port (41) so that the molten liquid can enter the mold cavity (42). After the model is formed, the hydraulic device (9) above the casting model (4) is driven to drive the upper section of the casting model (4) to move upward, and finally the model is taken out.

2. A motor rotor squirrel cage low-pressure copper casting equipment according to claim 1, Features: The insulation furnace (1) is externally provided with: A feed pipe (11) is obliquely inserted through the insulation furnace (1) and the crucible (2) to allow the molten liquid to enter the interior of the crucible (2).

3. A motor rotor squirrel cage low-pressure copper casting equipment according to claim 1, Features: The insulation furnace (1) is provided with: An air intake pipe (12), the air intake pipe (12) runs through the insulation furnace (1), the horizontal length of the air intake pipe (12) shall not exceed the crucible (2), and the pipe opening faces downward; An air outlet (13), the air outlet (13) being arranged at the lower end of the heat preservation furnace (1), and a pressure control valve (131) being connected below the air outlet (13) to control the pressure of the air outlet (13) to ensure that the pressure output by the air inlet pipe (12) is always greater than the pressure of the air outlet (13).

4. A motor rotor squirrel cage low-pressure copper casting equipment according to claim 1, Features: A groove (31) is provided on the outer walls of both sides of the liquid riser (3) above the crucible (2), and a bearing (32) is fixedly connected to the groove (31); The inner walls of both sides of the heat preservation furnace (1) are provided with B grooves (14), and the B grooves (14) are fixedly connected with bearings (32); A rotating rod (7), the outer wall of the rotating rod (7) being rotatably connected to a bearing (32); A fan (71), wherein the fan (71) is arranged below the pipe opening of the air intake pipe (12), and the fan (71) is fixedly connected to the outer wall of the rotating rod (7).

5. The motor rotor squirrel cage low-pressure copper casting equipment according to claim 1, Features: The bottom end of the crucible (2) is fixedly connected with: A spring telescopic rod (21), wherein the spring telescopic rod (21) is used to support the housing (51).

6. A motor rotor squirrel cage low-pressure copper casting equipment according to claim 4, Features: The outer wall of the rotating rod (7) is fixedly connected with a cam (72); A moving rod (511), wherein the bottom end of the moving rod (511) is fixedly connected to the top end of the housing (51), and the top end of the moving rod (511) is rollingly connected to the cam (72); A sleeve (512) is provided at the lower end of the housing (51); The fixing rod (6) comprises: A sleeve rod (61), the outer wall of the sleeve rod (61) is slidably and sealingly connected to the inner wall of the sleeve (512); A push rod (62), the push rod (62) being slidably and sealingly connected to the inner wall of the filter screen (54); The middle rod (63) has a steel brush on its outer wall for cleaning impurities on the inner wall of the filter screen (54).

7. The motor rotor squirrel cage low-pressure copper casting equipment according to claim 1, Features: The upper part of the housing (51) is fixedly connected with: A moving ring (8), wherein an annular groove (81) is formed on the moving ring (8); The boss (33) is hollow inside, the outer wall of the boss (33) is slidably and sealingly connected to the annular groove (81), and the inner wall of the boss (33) is fixedly connected to the outer wall of the liquid riser (3).

8. The motor rotor squirrel cage low-pressure copper casting equipment according to claim 1, Features: The casting model (4) is provided with a through opening (41) inside, which is used to connect the liquid riser (3) and the mold cavity (42), so that the molten liquid can enter the mold cavity (42); A hydraulic device (9) is provided above the casting mold (4).

9. The motor rotor squirrel cage low-pressure copper casting equipment according to claim 4, Features: Gaps are left between the A groove (31) and the rotating rod (7), and between the B groove (14) and the rotating rod (7).

10. The motor rotor squirrel cage low-pressure copper casting equipment according to claim 4, Features: The fan (71), the moving rod (511), the housing (51), the filter plate (53), the filter screen (54) and the moving ring (8) are all made of lightweight, high-temperature resistant materials, and the remaining materials in the heat-insulating furnace (1) are all heat-resistant materials.

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