A low pressure casting gating system and method

Abstract

The application discloses a low-pressure casting pouring system and a pouring method, which comprise a pouring gate, a cutoff device and a control unit, when any horizontal pouring gate above the lowest horizontal pouring gate is filled with metal liquid, the corresponding cutoff device of the adjacent horizontal pouring gate below is closed under the control of the control unit, when the riser is filled with metal liquid, the control unit controls the last cutoff device to be closed to complete the pouring process. According to the technical scheme, the control unit is used for controlling the cutoff devices, the cutoff devices are sequentially closed from bottom to top, the casting cavity is regularly filled from bottom to top, and then the solidification process of the casting cavity is regularly solidified from bottom to top, so that the formation of a local overheated area in the solidification process of the casting is avoided, and the generation of defects such as porosity, segregation and even hot cracking is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of casting, in particular to a low-pressure casting pouring system and a pouring method. BACKGROUND

[0002] Large aluminum alloy castings have the advantages of high overall strength, low manufacturing cost, and low density, and are widely used in the fields of aerospace, weapon industry, etc.

[0003] Due to the particularity of large aluminum alloy castings, low-pressure casting is generally used for forming. Low-pressure casting is a method of filling a mold cavity with liquid metal under pressure to form a casting. However, during the casting process of large aluminum alloy castings, the gate area at the bottom of the casting mold cavity is subjected to long-term scouring by high-temperature molten metal, and the sand mold has reduced heat conduction capacity, thereby forming a local overheating zone during the solidification process of the casting, which is prone to defects such as porosity, segregation, and even hot cracking. SUMMARY

[0004] Therefore, the present application provides a low-pressure casting pouring system, which realizes sequential pouring and filling of the casting mold cavity from bottom to top, and thus realizes sequential solidification of the casting from bottom to top.

[0005] The present application also provides a pouring method comprising the above low-pressure casting pouring system.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0007] A low-pressure casting pouring system applied to the pouring of aluminum alloy castings, comprising:

[0008] A runner comprising a plurality of horizontal runners, a plurality of groups of slit runners, and at least one group of liquid inlet runners; the plurality of horizontal runners are uniformly and spacedly arranged from bottom to top, and adjacent horizontal runners are connected by a group of slit runners;

[0009] A first end of the slit runner located at the top is connected to the horizontal runner located at the top, and a second end is provided with a riser; the number of groups of slit runners is equal to the number of horizontal runners, and each slit runner is provided with a pouring part in communication with the casting mold cavity;

[0010] The liquid inlet runner comprises a vertical runner and a plurality of connecting runners, and the number of connecting runners corresponds to the number of horizontal runners; one end of each connecting runner is connected to the liquid outlet end of the vertical runner, and the other end is connected to the corresponding horizontal runner; the liquid inlet end of the vertical runner is used to be connected to a pouring gate;

[0011] A flow cutoff device, the number of flow cutoff devices corresponds to the number of connecting runners, and each connecting runner is provided with a corresponding flow cutoff device.

[0012] a control unit for controlling the closing of each of the cutoff devices;

[0013] wherein, when any of the horizontal runners above the lowermost horizontal runner is full of molten metal, the corresponding cutoff device of the horizontal runner adjacent to the lowermost horizontal runner is controlled to close by the control unit; and when the riser is full of molten metal, the last cutoff device is controlled to close by the control unit to complete the casting process.

[0014] Preferably, each group of the slit runners comprises a plurality of sub-slit runners, the plurality of sub-slit runners are arranged around the circumference of the casting cavity, and each of the sub-slit runners is provided with the pouring section.

[0015] Preferably, the projections of the sub-slit runners in a group of the slit runners in the vertical direction are staggered with the projections of the sub-slit runners in an adjacent group of the slit runners in the vertical direction.

[0016] Preferably, the number of the sub-slit runners is four, and the included angle between adjacent sub-slit runners is 90 degrees.

[0017] Preferably, the height of the pouring section is equal to the height of the sub-slit runner.

[0018] Preferably, the horizontal runner is in the shape of a circular ring.

[0019] Preferably, the cutoff device comprises a cutoff valve and a motor.

[0020] The cutoff valve is arranged on the connecting runner, and the rotating switch of the cutoff valve is connected with the motor, and the motor receives and executes the instructions of the control unit to control the closing of the cutoff valve.

[0021] Preferably, the cutoff valve comprises a cutoff valve cover, a hole core, a connecting rod and a driven wheel.

[0022] The cutoff valve cover has an inlet and an outlet.

[0023] The hole core is arranged on a flow channel formed between the inlet and the outlet, and the hole core is connected with the driven wheel outside the cutoff valve cover through the connecting rod, and the motor controls the rotation of the hole core through the driven wheel to control the disconnection of the flow channel.

[0024] Preferably, the control unit comprises a controller and a plurality of groups of signal lines.

[0025] The signal line comprises a first wire and a second wire, and the first end of the first wire and the first end of the second wire of the signal line are connected to the controller; the second end of the first wire and the second end of the second wire constitute liquid receiving ends, and the second end of the first wire and the second end of the second wire are arranged apart;

[0026] The liquid receiving ends of the signal lines of each group are respectively preset in each horizontal runner above the lowest horizontal runner; when the horizontal runner in which the liquid receiving end is preset is filled with metal liquid, a loop is formed between the first wire, the second wire and the controller, the controller receives the signal that the horizontal runner is filled with metal liquid, thereby controlling the corresponding intercepting device of the horizontal runner below to be closed;

[0027] The liquid receiving ends of the signal lines of the uppermost group are preset in the riser; when the riser is filled with metal liquid, a loop is formed between the first wire, the second wire and the controller, the controller receives the signal that the riser is filled with metal liquid, thereby controlling the last intercepting device to be closed to complete the pouring process.

[0028] A pouring method applied to the low-pressure casting pouring system, the pouring method comprising:

[0029] After the mold of the low-pressure casting pouring system is coated with a layer of release agent, sand is mixed by a sand mixer to form a sand mold;

[0030] The intercepting device is installed at a preset position in the sand mold, and the liquid inlet end of the vertical runner is connected to the pouring opening through a pouring channel;

[0031] Metal liquid is poured into the pouring opening, so that the metal liquid sequentially pours into the mold cavity of the casting through the pouring opening, the pouring channel, the liquid inlet runner, the gap runner and the pouring part, and the pouring process is completed when the last intercepting device is closed, and the casting is formed after the metal liquid cools and solidifies.

[0032] As can be seen from the above technical solutions, the low-pressure casting pouring system provided by the application realizes the sequential closing of the intercepting devices from bottom to top by controlling the intercepting devices by the control unit, so that the mold cavity of the casting is filled regularly from bottom to top (avoiding the pouring area at the bottom of the mold cavity being eroded by high-temperature metal liquid for a long time), and then the solidification process of the mold cavity of the casting is regular from bottom to top, thereby avoiding the formation of local overheated areas during the solidification process of the casting, and avoiding the generation of defects such as porosity, segregation and even hot cracking.

[0033] The application also provides a pouring method, which has corresponding beneficial effects due to the application of the low-pressure casting pouring system, and specific reference can be made to the foregoing description, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0035] Figure 1 A structure schematic diagram of a casting provided by the embodiment of the present application;

[0036] Figure 2 A structure schematic diagram of a pouring system provided by the embodiment of the present application;

[0037] Figure 3 A structure schematic diagram of a pouring system (hidden casting cavity) provided by the embodiment of the present application;

[0038] Figure 4a A structure schematic diagram of a flow interception device provided by the embodiment of the present application;

[0039] Figure 4b A first perspective view of the flow interception device provided by the embodiment of the present application;

[0040] Figure 4c A second perspective view of the flow interception device provided by the embodiment of the present application;

[0041] Figure 5 A control principle diagram of the pouring system provided by the embodiment of the present application;

[0042] Figure 6 A flow schematic diagram of the pouring method provided by the embodiment of the present application.

[0043] The meanings of various reference signs in the drawings are as follows:

[0044] 10 is a runner, 11 is a horizontal runner, 12 is a slit runner, 121 is a sub-slit runner, 13 is an inlet runner, 131 is a vertical runner, 132 is a connecting runner, 14 is a pouring part, and 15 is a riser;

[0045] 20 is a flow interception device, 21 is a flow interception valve, 211 is a flow interception valve cover, 212 is a hole core, 213 is a connecting rod, 214 is a driven wheel, 215 is a positioning rod, and 22 is a motor;

[0046] 30 is a control unit, 31 is a controller, 32 is a signal line; 40 is a casting cavity; 50 is a casting. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0048] The pouring system for low-pressure casting provided by the embodiments of the present application is applied to pouring of aluminum alloy castings, such as Figures 1-6 as shown in the figure,

[0049] The runner 10 includes multiple horizontal runners 11, multiple groups of gap runners 12 and at least one group of liquid inlet runners 13. The multiple horizontal runners 11 are arranged in a uniform and spaced manner from bottom to top, and adjacent horizontal runners 11 are connected through a group of gap runners 12.

[0050] The first end of the gap runner 12 located at the top end is connected to the horizontal runner 11 located at the top end, and the second end is provided with a riser 15. The number of groups of gap runners 12 is equal to the number of horizontal runners 11, and each gap runner 12 is provided with a pouring part 14 in communication with the casting cavity 40.

[0051] The liquid inlet runner 13 includes a vertical runner 131 and multiple connection runners 132. The number of connection runners 132 corresponds to the number of horizontal runners 11 one by one. One end of each connection runner 132 is connected to the liquid outlet end of the vertical runner 131, and the other end is connected to the corresponding horizontal runner 11, respectively. The liquid inlet end of the vertical runner 131 is used to be connected with the pouring gate.

[0052] The number of the flow cutoff device 20 corresponds to the number of the connection runner 132 one by one, and each connection runner 132 is provided with a corresponding flow cutoff device 20.

[0053] The control unit 30 is used to control the closing of each flow cutoff device 20, so that each flow cutoff device 20 is closed from bottom to top during the pouring process, so as to realize that each horizontal runner 11 no longer flows into the metal liquid from bottom to top after being filled with the metal liquid.

[0054] When any horizontal runner 11 above the horizontal runner 11 located at the bottom is filled with the metal liquid, the flow cutoff device 20 corresponding to the horizontal runner 11 located below is closed under the control of the control unit 30. When the riser 15 is filled with the metal liquid, the control unit 30 controls the closing of the last flow cutoff device 20 to complete the pouring process.

[0055] In the above scheme, the basic principle of the pouring process is that each shutoff device 20 is opened at the beginning of pouring, and when the molten metal successively flows from the pouring gate through the vertical sprue 131, the connecting sprue 132, the horizontal sprue 11, and the gap sprue 12, and finally fills the casting cavity 40 from the pouring section 14, the flow direction of the molten metal is shown by the arrow in Figure 2 During the above pouring process, the control unit 30 controls (closes) the shutoff device 20 arranged on the connecting sprue 132, so that the shutoff device 20 is sequentially closed from bottom to top, so that the casting cavity 40 is regularly filled from bottom to top (to avoid the pouring gate area at the bottom of the casting cavity being eroded by high-temperature molten metal for a long time), and the solidification process of the casting cavity 40 is regularly solidified from bottom to top, thereby avoiding the formation of a local overheating zone during the solidification process of the casting, thereby avoiding the generation of defects such as porosity, segregation, and even hot cracking.

[0056] In an alternative embodiment, as shown in Figure 2 and Figure 3 Each group of gap sprues 12 includes a plurality of sub-gap sprues 121, which are arranged around the circumference of the casting cavity 40, and each sub-gap sprue 121 is provided with a pouring section 14. In this technical solution, the multi-angle filling of the casting cavity 40 can be achieved by arranging a plurality of sub-gap sprues 121, so that the casting is uniformly heated and solidified, and further avoiding defects such as porosity, segregation, and even hot cracking after solidification.

[0057] Optimizing the above technical solution, as shown in Figure 2 and Figure 3 The projections of the sub-gap sprues 121 in one group of gap sprues 12 and the sub-gap sprues 121 in an adjacent group of gap sprues 12 in the vertical direction are staggered. In this way, the sub-gap sprues 121 in each group are not arranged in a straight line in the vertical direction, which can prevent the molten metal from flowing too fast during the flow process, thereby preventing the sand mold from being damaged. This arrangement also allows the casting cavity 40 to be uniformly filled with liquid, and can supplement the solidification process of the casting below to achieve better metallurgical quality.

[0058] Optimizing the above technical solution, the number of sub-gap sprues 121 is four, and the included angle between adjacent sub-gap sprues 121 is 90 degrees, so that the casting cavity 40 is uniformly filled with liquid from four directions, which is beneficial to the filling of the casting cavity 40 and the solidification of the casting 50.

[0059] Optimizing the above technical solution, as shown in Figure 2 The height of the pouring section 14 is equal to the height of the sub-gap sprue 121, which can quickly fill the casting cavity 40 and avoid the molten metal flowing too fast, thereby preventing the sand mold from being damaged.

[0060] In an alternative embodiment, the horizontal runner 11 is in the shape of a circular ring, which is beneficial for the filling of the casting cavity 40, but in actual industrial applications, the specific shape of the horizontal runner 11 can be adjusted according to the shape of the casting cavity 40, and no limitation is made thereto.

[0061] In an alternative embodiment, as shown in Figures 4a-4b The shut-off device 20 includes a shut-off valve 21 and a motor 22.

[0062] The shut-off valve 21 is arranged on the connecting runner 132, and the rotating switch of the shut-off valve 21 is connected with the motor 22, and the motor 22 receives and executes the instructions of the control unit 30 to control the closing of the shut-off valve 21, and in the technical solution, the sequential closing of the shut-off device 20 is realized by controlling the shut-off valve 21; in addition, the control unit 30 can also issue instructions to control the opening of the shut-off valve 21 as needed.

[0063] In an alternative embodiment, as shown in Figure 4a The shut-off valve 21 includes a shut-off valve cover body 211, a hole core 212, a connecting rod 213 and a driven wheel 214.

[0064] The shut-off valve cover body 211 has a liquid inlet and a liquid outlet;

[0065] The hole core 212 is located on the flow channel formed between the liquid inlet and the liquid outlet,

[0066] The hole core 212 is located on the flow channel formed between the liquid inlet and the liquid outlet, and the hole core 212 is connected with the driven wheel 214 outside the shut-off valve cover body 211 through the connecting rod 213, and the motor 22 controls the rotation of the hole core 212 through the driven wheel 214 to control the flow-through and disconnection of the flow channel, and in the technical solution, when the motor 22 receives and executes the instructions of the control unit 30, the motor 22 controls the disconnection of the flow channel through the driven wheel 214 to realize the closing of the shut-off valve 21.

[0067] In an alternative embodiment, as shown in Figures 4a-4c The hole core 212 is composed of a circular iron ball or steel ball with a central through hole, and a positioning rod 215 is installed below the hole core 212 for positioning in the sand mold; the shut-off valve cover body 211 is composed of a left cover body and a right cover body, and the left cover body and the right cover body are respectively installed on the semicircular structures on the two sides of the hole core 212, and the upper part is reserved with a through hole for the connecting rod 213 to pass through, and the lower part is reserved with a through hole for the positioning rod 215 to insert; the left cover body and the right cover body are respectively reserved with a cover body through hole (i.e. the liquid inlet and the liquid outlet are cover body through holes) with the same inner diameter as the central through hole of the hole core 212, so that the molten metal can pass through.

[0068] In an alternative embodiment, the control unit 30 includes a controller 31 and a plurality of groups of signal lines 32.

[0069] The signal line 32 comprises a first wire and a second wire, and the first end of the first wire and the first end of the second wire of the signal line 32 are connected to the controller 31; the second end of the first wire and the second end of the second wire constitute liquid connection ends, and the second end of the first wire and the second end of the second wire are arranged apart so that when the horizontal runner 11 or the riser 15 is not filled with the molten metal, the second end of the first wire and the second end of the second wire are disconnected and not connected.

[0070] The liquid connection ends of each group of signal lines 32 are respectively arranged in each horizontal runner 11 above the lowest horizontal runner 11; when the horizontal runner 11 provided with the liquid connection end is filled with the molten metal, a loop is formed between the first wire, the second wire and the controller 31, the controller 31 receives the signal that the horizontal runner 11 is filled with the molten metal, thereby controlling the corresponding flow blocking device 20 of the horizontal runner 11 below to be closed;

[0071] The liquid connection ends of the uppermost group of signal lines 32 are arranged in the riser 15, and when the riser 15 is filled with the molten metal, a loop is formed between the first wire, the second wire and the controller 31, the controller receives the signal that the riser 15 is filled with the molten metal, thereby controlling the last flow blocking device 20 to be closed to complete the pouring process.

[0072] In the above technical solution, the second end of the first wire and the second end of the second wire cooperate with the molten metal to enable the controller 31 to receive the information that the corresponding horizontal runner 11 is filled with the molten metal, and then the flow blocking device 20 is used to complete the sequential filling of the casting cavity 40 from bottom to top, thereby avoiding the gate area at the bottom of the casting cavity 40 from being subjected to long-time high-temperature molten metal (i.e. the molten metal) during the pouring process. It should be noted that the gate area can be understood as the area connected between the pouring part 14 and the casting cavity 40.

[0073] In the optimized above technical solution, the control unit 30 further comprises an execution module, and the execution module is used to control the pouring of the molten metal; when the controller receives the signal that the riser 15 is filled with the molten metal, in addition to controlling the last flow blocking device 20 to be closed, the execution module is also controlled to stop the pouring of the molten metal.

[0074] On the basis of any of the above embodiments, the number of liquid inlet runners 13 is multiple, and as a preferred embodiment, the number of liquid inlet runners 13 is two, and the two groups of liquid inlet runners 13 are symmetrically arranged.

[0075] A pouring method applied to the above low-pressure casting pouring system, the low-pressure casting pouring system comprising:

[0076] S1. After coating the mold of the low-pressure casting gating system with a layer of release agent, the sand is mixed and molded using a sand mixer to form a sand mold;

[0077] Among them, after the mold is coated with a layer of release agent, it is dried and then assembled. It should also be noted that the sand mold can be shaped in sections according to actual needs. After the sections are shaped, the sand molds are assembled from bottom to top on the moving platform.

[0078] S2. Install the interceptor 20 in the preset position inside the sand mold, and connect the liquid inlet end of the vertical gating channel 131 to the pouring port through the pouring channel.

[0079] S3. The molten metal is poured into the casting cavity 40 through the pouring port, the pouring channel, the liquid inlet gate 13, the slit gate 12, and the pouring part 14 in sequence. The pouring process is completed when the last shut-off device 20 is closed. After the molten metal cools and solidifies, the casting 50 is formed.

[0080] Using the above-mentioned casting method, it is possible to achieve stable bottom-up filling and sequential solidification of large aluminum alloy hanging castings, thus solving the problems of porosity, segregation, and cracks that easily occur at the bottom of large castings.

[0081] In one specific embodiment, such as Figure 1 As shown, the casting 50, cast using this low-pressure casting gating system or method, is placed on an aircraft. The dimensions of the casting 50 are: height 2500 mm, diameter 500-1100 mm, and overall wall thickness 3-5 mm. After casting using this low-pressure casting gating system or method, the casting 50 undergoes X-ray inspection, and the internal metallurgical quality meets the requirements of HB963-2005 Class I parts. The cutting performance of the designated area 3 on the casting 50 reaches a tensile strength σb = 480 MPa and an elongation δ = 13%. It should also be noted that the casting 50 has both large and small diameters.

[0082] In another specific embodiment, such as Figures 1-5As shown, the number of horizontal runners 11 is four, from bottom to top, they are the first horizontal runner, the second horizontal runner, the third horizontal runner and the fourth horizontal runner, the number of intercepting devices 20 is four, from bottom to top, they are the first intercepting device, the second intercepting device, the third intercepting device and the fourth intercepting device; the number of connecting runners 132 is four, from bottom to top, they are the first connecting runner, the second connecting runner, the third connecting runner and the fourth connecting runner; when the second horizontal runner is filled with molten metal, the control unit 30 receives the information that the second horizontal runner is filled with molten metal, and then controls the first intercepting device (arranged on the first connecting runner) corresponding to the first horizontal runner to close; when the third horizontal runner is filled with molten metal, the control unit 30 receives the information that the third horizontal runner is filled with molten metal, and then controls the second intercepting device (arranged on the second connecting runner) corresponding to the second horizontal runner to close; when the fourth horizontal runner is filled with molten metal, the control unit 30 receives the information that the fourth horizontal runner is filled with molten metal, and then controls the third intercepting device (arranged on the third connecting runner) corresponding to the third horizontal runner to close; when the riser 15 is filled with molten metal, the control unit 30 receives the information that the riser 15 is filled with molten metal, and then controls the fourth intercepting device (arranged on the fourth connecting runner) corresponding to the fourth horizontal runner to close.

[0083] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0084] The above description of the disclosed embodiments enables a person skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A low pressure casting gating system applied to the gating of an aluminum alloy casting, characterized by, The application relates to a gating system for a casting machine, which comprises: a gating system (10) comprising a plurality of horizontal gates (11), a plurality of groups of slit gates (12) and at least one group of liquid inlet gates (13); the plurality of horizontal gates (11) are arranged in a uniform manner from bottom to top, and adjacent horizontal gates (11) are connected through a group of slit gates (12); a first end of the slit gate (12) at the top is connected to the horizontal gate (11) at the top, and a second end is provided with a riser (15); the number of groups of slit gates (12) is equal to the number of horizontal gates (11), and each slit gate (12) is provided with a pouring part (14) which is connected to a casting cavity (40); the liquid inlet gate (13) comprises a vertical gate (131) and a plurality of connecting gates (132), the number of connecting gates (132) corresponds to the number of horizontal gates (11); one end of each connecting gate (132) is connected to the liquid outlet end of the vertical gate (131), and the other end is connected to the corresponding horizontal gate (11); the liquid inlet end of the vertical gate (131) is used for being connected to a pouring gate; a cutoff device (20), the number of cutoff devices (20) corresponds to the number of connecting gates (132), and each connecting gate (132) is provided with a corresponding cutoff device (20); a control unit (30) for controlling the closing of each cutoff device (20); when any horizontal gate (11) above the horizontal gate (11) at the bottom is filled with metal liquid, the corresponding cutoff device (20) of the horizontal gate (11) below is controlled to close by the control unit (30); when the riser (15) is filled with metal liquid, the last cutoff device (20) is controlled to close by the control unit (30) to complete the pouring process.

2. The gating system of claim 1, wherein Each group of slit gates (12) comprises a plurality of sub-slit gates (121), the plurality of sub-slit gates (121) are arranged around the circumference of the casting cavity (40), and each sub-slit gate (121) is provided with the pouring part (14).

3. The gating system of claim 2, wherein, The sub-slit gates (121) in one group of slit gates (12) are staggered with the projections of the sub-slit gates (121) in an adjacent group of slit gates (12) in the vertical direction.

4. The gating system of claim 2, wherein, The number of sub-slit gates (121) is four, and the included angle between adjacent sub-slit gates (121) is 90 degrees.

5. The gating system of claim 2, wherein, The height of the pouring part (14) is equal to the height of the sub-slit gate (121).

6. The gating system of claim 1, wherein The shape of the horizontal gate (11) is a circular ring.

7. The gating system of claim 1, wherein The cutoff device (20) comprises a cutoff valve (21) and a motor (22); the cutoff valve (21) is arranged on the connecting gate (132), and the rotating switch of the cutoff valve (21) is connected to the motor (22); the motor (22) receives and executes the instruction of the control unit (30) to control the closing of the cutoff valve (21).

8. The gating system of claim 7, wherein, The intercept valve (21) comprises an intercept valve cover (211), a hole core (212), a connecting rod (213) and a driven wheel (214); The intercept valve cover (211) has a liquid inlet and a liquid outlet; The hole core (212) is located on a flow channel formed between the liquid inlet and the liquid outlet, and the hole core (212) is connected to the driven wheel (214) outside the intercept valve cover (211) through the connecting rod (213), and the motor (22) controls the rotation of the hole core (212) through the driven wheel (214) to control the disconnection of the flow channel.

9. The gating system according to any one of claims 1 to 8, characterized in that The control unit (30) comprises a controller (31) and a plurality of signal lines (32); The signal line (32) comprises a first wire and a second wire, and the first end of the first wire and the first end of the second wire of the signal line (32) are connected to the controller (31); the second end of the first wire and the second end of the second wire constitute a liquid receiving end, and the second end of the first wire and the second end of the second wire are arranged apart; Wherein, the liquid receiving end of each group of signal lines (32) is respectively preset in each horizontal runner (11) above the lowest horizontal runner (11); when the horizontal runner (11) preset with the liquid receiving end is full of metal liquid, a loop is formed between the first wire, the second wire and the controller (31), and the controller (31) receives the signal that the horizontal runner (11) is full of metal liquid, thereby controlling the corresponding intercept device (20) of the horizontal runner (11) below to close; The liquid receiving end of the uppermost group of signal lines (32) is preset in the riser (15), and when the riser (15) is full of metal liquid, a loop is formed between the first wire, the second wire and the controller (31), and the controller receives the signal that the riser (15) is full of metal liquid, thereby controlling the last intercept device (20) to close to complete the pouring process.

10. A casting method, characterized by, The low-pressure casting pouring system of any one of claims 1-9, the pouring method comprising: After coating the mold of the low-pressure casting pouring system with a release agent, mixing sand with a sand mixer to form a sand mold; The intercept device (20) is installed at a preset position in the sand mold, and the liquid inlet of the vertical runner (131) is connected to the pouring gate through a pouring channel; Based on the pouring gate pouring metal liquid, the metal liquid sequentially passes through the pouring gate, the pouring channel, the liquid inlet runner (13), the gap runner (12), the pouring part (14) to pour the casting cavity (40), and the pouring process is completed when the last intercept device (20) is closed. After the metal liquid cools and solidifies, a casting (50) is formed.

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