CN115070007A - Vacuum decompression exhaust assembly and vacuum decompression casting device - Google Patents

Abstract

The invention relates to a vacuum decompression exhaust assembly and a vacuum decompression casting device. When molten metal begins to be injected into the cavity of the die, the exhaust valve is opened, the vacuumizing device is started, the cavity is vacuumized by the vacuumizing device, so that gas in the cavity enters the first exhaust channel through the first gas inlet, one part of gas in the first exhaust channel directly enters the vacuumizing device through the first exhaust port, and the other part of gas enters the second exhaust channel through the second gas inlet and then enters the vacuumizing device through the second exhaust port. When the metal liquid is injected into the cavity, the exhaust valve is closed, and under the suction of the vacuumizing device, the last part of gas in the high-speed section in the cavity enters the vacuumizing device through the first air inlet, the first exhaust channel, the second air inlet, the second exhaust channel and the second exhaust port, so that the problems of over cold shut and the like caused by the fact that the metal liquid in the cavity flows unsmoothly due to incomplete exhaust of the gas in the cavity are avoided, and the quality of castings is improved.

Description

Vacuum decompression exhaust assembly and vacuum decompression casting device

Technical Field

The invention relates to the technical field of casting equipment, in particular to a vacuum decompression exhaust assembly and a vacuum decompression casting device.

Background

Part of the parts of the automobile engine can be obtained by adopting a vacuum decompression casting process. When the vacuum pressure reduction casting is carried out, after the mold is closed, the metal liquid is poured into the pressure chamber and the pressure chamber is sealed, the gas in the mold cavity of the mold is pumped out by using a vacuumizing device, so that the metal liquid fills the mold cavity of the mold in a vacuum state, and a metal casting is obtained. However, the quality problems of cold shut and the like exist in part of metal castings obtained by adopting the vacuum decompression casting process.

Disclosure of Invention

Accordingly, there is a need for a vacuum degassing assembly and a vacuum casting apparatus, which can improve the quality of castings.

A vacuum relief exhaust assembly comprising:

the first exhaust main body is provided with a first air inlet, a first exhaust port and a first exhaust channel for communicating the first air inlet with the first exhaust port, the first air inlet is used for communicating with a cavity of a mold, and the first exhaust port is used for communicating with a vacuumizing device;

the exhaust valve is used for controlling the on-off of the first exhaust port and the vacuumizing device;

the second exhaust main part, the second exhaust main part is equipped with second air inlet, second gas vent and intercommunication the second air inlet with the second exhaust passage of second gas vent, the second exhaust passage passes through the second air inlet with first exhaust passage intercommunication, the second gas vent be used for with evacuating device intercommunication.

In one embodiment, the first exhaust body is further provided with a third exhaust port, and the third exhaust port is communicated with the second air inlet so as to communicate the second exhaust passage with the first exhaust passage.

In one embodiment, the first exhaust main body comprises a first exhaust pipe, the first exhaust pipe comprises a first pipe body and a second pipe body communicated with the first pipe body, the second pipe body is obliquely arranged relative to the first pipe body, one end, away from the second pipe body, of the first pipe body is provided with the first air inlet, one end, away from the first pipe body, of the second pipe body is provided with the first exhaust port, and the third exhaust port is arranged on the second pipe body.

In one embodiment, the first exhaust pipe further comprises a third pipe body, the third pipe body is arranged on the side part of the first pipe body and is communicated with the second pipe body; the first exhaust main body further comprises a second exhaust pipe, the second exhaust pipe comprises a fourth pipe body and a fifth pipe body, the fourth pipe body is arranged on one side, away from the first pipe body, of the third pipe body, the fifth pipe body is opposite to the fourth pipe body, the fourth pipe body is obliquely arranged and communicated with the fourth pipe body, the fourth pipe body is away from one end of the fifth pipe body, the first air inlet is formed in the one end, away from the fifth pipe body, of the fourth pipe body, and the first exhaust port is formed in the one end of the fourth pipe body.

In one embodiment, two first exhaust pipes and two second exhaust pipes are provided, the two first exhaust pipes and the two second exhaust pipes are symmetrically arranged with respect to a perpendicular line passing through the first exhaust port, and the second pipes of the two first exhaust pipes and the fifth pipes of the two second exhaust pipes are communicated with each other through a second communication pipe; the number of the third air outlets is two, and the two third air outlets are respectively arranged on the two second pipe bodies; the second exhaust main body is provided with two second air inlets, and the two second air inlets are respectively opposite to and communicated with the two third exhaust ports in a one-to-one correspondence manner.

A vacuum reduced-pressure casting apparatus comprising:

the mould is provided with a cavity and a decompression cavity communicated with the cavity;

a vacuum pumping device; and

the vacuum decompression exhaust assembly is arranged in the decompression cavity, the first air inlet is communicated with the cavity, and the first exhaust port and the second exhaust port are communicated with the vacuumizing device.

In one embodiment, the vacuum pumping device includes a first vacuum tube, a second vacuum tube, a vacuum pump, and a vacuum tank, the vacuum tank is respectively communicated with the first exhaust port and the second exhaust port through the first vacuum tube, and the vacuum pump is communicated with the vacuum tank through the second vacuum tube.

In one embodiment, the vacuum pumping device further comprises a vacuum valve, and the vacuum valve is arranged on the first vacuum pumping pipe.

In one embodiment, the vacuum reduced-pressure casting device further comprises an injection punch and a pressure chamber, the pressure chamber is provided with an opening and a pouring cavity communicated with the cavity, and the opening is arranged on one side of the pressure chamber, which is far away from the die, and is communicated with the pouring cavity; the injection punch is arranged on one side, far away from the die, of the pressure chamber, and the injection punch is inserted into the pouring cavity through the opening and can move in the pouring cavity towards the direction close to or far away from the die.

In one embodiment, the pressure chamber has a shot start position and a shot end position that is close to the mold relative to the shot start position, and the shot punch is movable between the shot start position and the shot end position; the vacuum reduced-pressure casting device further comprises a controller, wherein the controller is respectively in communication connection with the exhaust valve and the vacuum valve, and is used for controlling the vacuum valve and the exhaust valve to be opened when the injection punch is located at the injection starting position, and controlling the exhaust valve to be closed and the vacuum valve to be closed in a delayed mode when the injection punch is located at the injection finishing position.

Foretell vacuum decompression exhaust subassembly and vacuum decompression casting device, when beginning to press the injection molten metal to the die cavity of mould, open discharge valve, start evacuating device, evacuating device carries out the evacuation to the die cavity, make the gas in the die cavity get into first exhaust passage through first air inlet, partly gas in the first exhaust passage directly gets into evacuating device through first exhaust port in, partly gas gets into the second exhaust passage through the second air inlet in addition, get into evacuating device through the second exhaust port in again, realize the decompression of die cavity and exhaust. When the metal liquid is injected into the cavity, the exhaust valve is closed, the vacuumizing device is communicated with the cavity through the first exhaust channel and the second exhaust channel, and under the suction of the vacuumizing device, the last part of gas in the high-speed section in the cavity enters the first exhaust channel through the first air inlet, enters the second exhaust channel through the second air inlet and finally enters the vacuumizing device through the second air outlet, so that the problems that the metal liquid in the cavity is not smoothly flowed due to incomplete discharge of the gas in the cavity, excessive cold shut and the like are avoided, and the quality of a casting is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of a vacuum evacuation assembly according to an embodiment of the present invention;

FIG. 2 is a schematic view of a vacuum reduced pressure casting apparatus according to an embodiment of the present invention.

The reference numbers illustrate: 10. a vacuum pressure reducing exhaust assembly; 11. a first exhaust body; 111. a first air inlet; 112. a first exhaust port; 113. a first exhaust passage; 114. a third exhaust port; 115. a first exhaust pipe; 1151. a first pipe body; 1152. a second tube body; 1153. a third tube; 116. a second exhaust pipe; 1161. a fourth tube body; 1162. a fifth pipe body; 117. a first communication pipe; 118. a second communicating pipe; 12. an exhaust valve; 13. a second exhaust body; 131. a second air inlet; 132. a second exhaust port; 133. a second exhaust passage; 20. a mold; 22. fixing a mold; 23. moving the mold; 30. a vacuum pumping device; 31. a first evacuation tube; 32. a second vacuum tube; 33. a vacuum tank; 34. a vacuum pump; 35. a vacuum valve; 40. a pressure chamber; 41. a pouring cavity; 42. a pouring gate; 50. injecting a punch; 60. and a controller.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Referring to fig. 1 and 2, a vacuum pressure reducing exhaust assembly 10 according to an embodiment of the present invention includes a first exhaust body 11, an exhaust valve 12, and a second exhaust body 13. The first exhaust body 11 is provided with a first air inlet 111, a first exhaust port 112 and a first exhaust channel 113 communicating the first air inlet 111 and the first exhaust port 112, the first air inlet 111 is used for communicating with a cavity of the mold 20, the first exhaust port 112 is used for communicating with the vacuum extractor 30, and the exhaust valve 12 is used for controlling on-off between the first exhaust channel 113 and the vacuum extractor 30. The second exhaust body 13 is provided with a second air inlet 131, a second exhaust port 132 and a second exhaust passage 133 communicating the second air inlet 131 and the second exhaust port 132, the second exhaust passage 133 is communicated with the first exhaust passage 113 through the second air inlet 131, and the second exhaust port 132 is used for being communicated with the vacuum extractor 30.

Optionally, the exhaust valve 12 is provided at the first exhaust port 112; alternatively, the exhaust valve 12 is provided on the first evacuation tube 31 between the first exhaust port 112 and the evacuation device 30.

When the molten metal is injected into the cavity of the mold 20, the exhaust valve 12 is opened, the vacuum extractor 30 is started, the vacuum extractor 30 performs vacuum extraction on the cavity, so that gas in the cavity enters the first exhaust channel 113 through the first gas inlet 111, a part of gas in the first exhaust channel 113 directly enters the vacuum extractor 30 through the first exhaust port 112, and the other part of gas enters the second exhaust channel 133 through the second gas inlet 131 and then enters the vacuum extractor 30 through the second exhaust port 132, thereby realizing the decompression and exhaust of the cavity. When the metal liquid injection into the cavity is finished, the exhaust valve 12 is closed, at the moment, the vacuumizing device 30 is communicated with the cavity through the first exhaust channel 113 and the second exhaust channel 133, under the suction of the vacuumizing device 30, the last part of gas in the high-speed section in the cavity enters the first exhaust channel 113 through the first air inlet 111, then enters the second exhaust channel 133 through the second air inlet 131, and finally enters the vacuumizing device 30 through the second air outlet 132, so that the problems of cold shut and the like caused by the fact that the metal liquid in the cavity is not smoothly flowed due to incomplete discharge of the gas in the cavity are avoided, and the quality of castings is improved.

In one embodiment, referring to fig. 1, the first exhaust body 11 is further provided with a third exhaust port 114, and the third exhaust port 114 communicates with the second intake port 131 to communicate the second exhaust passage 133 with the first exhaust passage 113. In this manner, by providing the third exhaust port 114, the first exhaust passage 113 can be communicated with the second exhaust passage 133 through the third exhaust port 114 and the second intake port 131.

It should be noted that the shape and size of the third exhaust port 114 can be set according to actual requirements, and are not limited in detail here. In the present embodiment, the third exhaust port 114 is a bar-shaped port extending in the length direction of the first exhaust passage 113, wherein the width of the bar-shaped port is 0.2 mm.

In one embodiment, referring to FIG. 1, the first exhaust body 11 includes a first exhaust duct 115. The first exhaust pipe 115 includes a first pipe 1151 and a second pipe 1152 communicating with the first pipe 1151, and the second pipe 1152 is disposed obliquely to the first pipe 1151. The first inlet 111 is disposed at an end of the first tube 1151 away from the second tube 1152, the first outlet 112 is disposed at an end of the second tube 1152 away from the first tube 1151, and the third outlet 114 is disposed at the second tube 1152. Thus, the second tube 1152 is inclined relative to the first tube 1151, and the third exhaust port 114 is disposed in the second tube 1152, so as to avoid air leakage and improve the pressure reducing and exhausting effect.

Further, referring to fig. 1, the first exhaust pipe 115 further includes a third pipe 1153, and the third pipe 1153 is disposed at a side portion of the first pipe 1151 and communicates with the second pipe 1152. Thus, the exhaust amount of the first exhaust body 11 can be increased, and the decompression exhaust efficiency can be improved.

Further, the first exhaust body 11 further includes a second exhaust pipe 116. The second exhaust pipe 116 includes a fourth tube 1161 and a fifth tube 1162, the fourth tube 1161 is disposed on a side of the third tube 1153 away from the first tube 1151, and the fifth tube 1162 is inclined relative to the fourth tube 1161 and is communicated with the fourth tube 1161. A first air inlet 111 is disposed at an end of the fourth tube 1161 away from the fifth tube 1162, and a first air outlet 112 is disposed at an end of the fifth tube 1162 away from the fourth tube 1161. Specifically, the first tube 1151, the third tube 1153 and the fourth tube 1161 communicate through the first communication tube 117. Thus, the exhaust amount of the first exhaust body 11 can be increased, and the decompression exhaust efficiency can be improved.

In the present embodiment, referring to fig. 1, two first exhaust pipes 115 and two second exhaust pipes 116 are provided, the two first exhaust pipes 115 are symmetrically disposed about a vertical line of the first exhaust port 112, and the two second exhaust pipes 116 are also symmetrically disposed about a vertical line of the first exhaust port 112. The second tubes 1152 of the two first exhaust pipes 115 and the fifth tubes 1162 of the two second exhaust pipes 116 are communicated with each other by a second communication pipe 118. The second exhaust main body 13 is provided with two second air inlets 131, and the two second air inlets 131 are respectively opposite to and communicated with the two third exhaust ports 114 in a one-to-one correspondence manner.

Referring to fig. 1 and 2, a vacuum casting apparatus according to an embodiment of the present invention includes a mold 20, a vacuum pumping device 30, and a vacuum exhaust assembly 10 according to any of the embodiments. The mould 20 is provided with a cavity and a decompression cavity communicated with the cavity, the vacuum decompression exhaust assembly 10 is arranged in the decompression cavity, the first air inlet 111 is communicated with the cavity, and the first exhaust port 112 and the second exhaust port 132 are both communicated with the vacuum pumping device.

Specifically, the mold 20 comprises a fixed mold 22 and a movable mold 23, the movable mold 23 and the fixed mold 22 are matched to form a cavity, and the decompression cavity is arranged in the fixed mold 22.

When the molten metal is injected into the cavity of the mold 20, the exhaust valve 12 is opened, the vacuumizing device 30 is started, the vacuumizing device 30 vacuumizes the cavity, so that the gas in the cavity enters the first exhaust channel 113 through the first gas inlet 111, a part of the gas in the first exhaust channel 113 directly enters the vacuumizing device 30 through the first exhaust port 112, and the other part of the gas enters the second exhaust channel 133 through the second gas inlet 131 and then enters the vacuumizing device 30 through the second exhaust port 132, thereby realizing the decompression and exhaust of the cavity. When the metal liquid injection into the cavity is finished, the exhaust valve 12 is closed, at the moment, the vacuumizing device 30 is communicated with the cavity through the first exhaust channel 113 and the second exhaust channel 133, under the suction of the vacuumizing device 30, the last part of gas in the high-speed section in the cavity enters the first exhaust channel 113 through the first air inlet 111, then enters the second exhaust channel 133 through the second air inlet 131, and finally enters the vacuumizing device 30 through the second air outlet 132, so that the problems of cold shut and the like caused by the fact that the metal liquid in the cavity is not smoothly flowed due to incomplete discharge of the gas in the cavity are avoided, and the quality of castings is improved.

In one embodiment, referring to fig. 1 and 2, the evacuation device 30 includes a first evacuation tube 31, a second evacuation tube 32, a vacuum pump 34, and a vacuum tank 33. The vacuum tank 33 is respectively communicated with the first exhaust port 112 and the second exhaust port 132 through the first vacuum pipe 31, and the vacuum pump 34 is communicated with the vacuum tank 33 through the second vacuum pipe 32. Specifically, the vacuum tank 33 is provided with a first communication port and a second communication port, the first evacuation tube 31 is provided at the first communication port, and the second evacuation tube 32 is provided at the second communication port. When vacuum pressure reduction is required, the vacuum pump 34 is turned on, and the gas in the cavity is pumped into the vacuum tank 33 through the first exhaust passage 113 and the second exhaust passage 133, respectively, and stored.

Further, referring to fig. 2, the vacuum pumping device 30 further includes a vacuum valve 35, and the vacuum valve 35 is disposed on the first vacuum pipe 31. Alternatively, the vacuum valve 35 is a vacuum solenoid valve. When the molten metal starts to be injected into the cavity of the mold 20, the exhaust valve 12 and the vacuum valve 35 are opened, the vacuum pump 34 is started, the vacuum pump 34 vacuumizes the cavity, so that gas in the cavity enters the first exhaust channel 113 through the first gas inlet 111, a part of gas in the first exhaust channel 113 directly enters the vacuum tank 33 through the first exhaust port 112, and the other part of gas enters the second exhaust channel 133 through the second gas inlet 131 and then enters the vacuum tank 33 through the second exhaust port 132, so that decompression and exhaust of the cavity are realized. When the metal liquid injection into the cavity is finished, the exhaust valve 12 is closed, under the suction of the vacuum pump 34, the last part of gas in the high-speed section in the cavity enters the first exhaust channel 113 through the first gas inlet 111, enters the second exhaust channel 133 through the second gas inlet 131, and finally enters the vacuum tank 33 through the second exhaust port 132, so that the problems of over cold shut and the like caused by the fact that the metal liquid in the cavity flows unsmoothly due to incomplete exhaust of the gas in the cavity are avoided, and the quality of castings is improved.

Further, the vacuum evacuation device 30 further includes a vacuum pressure detector for detecting the vacuum pressure in the vacuum tank 33. In this way, by providing the vacuum pressure detector, the vacuum pressure detector detects the vacuum pressure in the vacuum tank 33 in real time, so that the vacuum pressure in the vacuum tank 33 can be grasped in real time, and the vacuum pressure in the vacuum tank 33 can be prevented from being too high.

In one embodiment, referring to fig. 2, the vacuum pressure reduction casting apparatus further comprises a shot punch 50 and a pressure chamber 40. The pressure chamber 40 is provided with an opening and a pouring cavity 41, and the pouring cavity 41 is communicated with the cavity. The opening is provided on a side of the pressure chamber 40 remote from the mold 20 and communicates with a pouring cavity 41. The injection punch 50 is provided on a side of the pressure chamber 40 away from the die 20, and the injection punch 50 is inserted into the pouring cavity 41 through the opening and is movable in the pouring cavity 41 in a direction toward or away from the die 20. Further, the pressure chamber 40 is further provided with a pouring gate 42, and the pouring gate 42 is communicated with the pouring cavity 41. During die casting, the die 20 is closed, so that the cavity is a well-sealed space. And injecting molten metal into the pouring cavity 41 through the pouring gate 42, starting the injection punch 50 after pouring, moving the injection punch 50 towards the direction close to the die 20, closing the pouring gate 42, and gradually injecting the molten metal into the die cavity for molding.

Further, referring to fig. 2, the pressure chamber 40 has a shot start position and a shot end position that is close to the die 20 relative to the shot start position, and the shot punch 50 is movable between the shot start position and the shot end position. The vacuum reduced-pressure casting apparatus further comprises a controller 60 for controlling the vacuum valve 35 and the exhaust valve 12 to be opened when the shot punch 50 is located at the shot start position, and for controlling the exhaust valve 12 to be closed and the vacuum valve 35 to be closed with a delay when the shot punch 50 is located at the shot end position. During die casting, the die 20 is closed, so that the cavity is a well-sealed space. The molten metal is poured into the pouring cavity 41 through the pouring gate 42, after pouring is finished, the injection punch 50 is started, the injection punch 50 moves towards the direction close to the mold 20 to seal the pouring gate 42, at the moment, the controller 60 controls the exhaust valve 12 and the vacuum valve 35 to be opened, the vacuum pump 34 vacuumizes the cavity, so that gas in the cavity enters the first exhaust channel 113 through the first gas inlet 111, part of gas in the first exhaust channel 113 directly enters the vacuum tank 33 through the first exhaust port 112, the other part of gas enters the second exhaust channel 133 through the second gas inlet 131, and then enters the vacuum tank 33 through the second exhaust port 132, and decompression and exhaust of the cavity are achieved. During the process of vacuum pumping, when the injection plunger 50 continuously moves towards the direction close to the die 20 to the position where the injection of the molten metal into the die cavity is finished, the controller 60 controls the exhaust valve 12 to be closed immediately and the vacuum valve 35 to be closed in a delayed manner, under the suction of the vacuum pump 34, the last part of gas in the high-speed section in the die cavity enters the first exhaust channel 113 through the first gas inlet 111, then enters the second exhaust channel 133 through the second gas inlet 131, and finally enters the vacuum tank 33 through the second exhaust port 132, so that the problems of unsmooth flow of the molten metal in the die cavity, excessive cold shut and the like caused by incomplete discharge of the gas in the die cavity are avoided, and the quality of the casting is improved.

It will be appreciated that the vacuum valve 35 has a time delay function. The time delay of the vacuum valve 35 may be set according to actual requirements, and is not specifically limited herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A vacuum relief exhaust assembly, comprising:

the first exhaust main body is provided with a first air inlet, a first exhaust port and a first exhaust channel for communicating the first air inlet with the first exhaust port, the first air inlet is used for communicating with a cavity of a mold, and the first exhaust port is used for communicating with a vacuumizing device;

the exhaust valve is used for controlling the on-off of the first exhaust port and the vacuumizing device;

the second exhaust main body is provided with a second air inlet, a second exhaust port and a second exhaust passage communicated with the second air inlet and the second exhaust port, the second exhaust passage is communicated with the first exhaust passage through the second air inlet, and the second exhaust port is communicated with the vacuumizing device.

2. The vacuum reducing exhaust assembly according to claim 1, wherein the first exhaust body is further provided with a third exhaust port, the third exhaust port communicating with the second intake port to communicate the second exhaust passage with the first exhaust passage.

3. The vacuum pressure reducing exhaust assembly according to claim 2, wherein the first exhaust body comprises a first exhaust pipe, the first exhaust pipe comprises a first pipe body and a second pipe body communicated with the first pipe body, the second pipe body is arranged obliquely relative to the first pipe body, the first inlet is arranged at one end of the first pipe body far away from the second pipe body, the first exhaust port is arranged at one end of the second pipe body far away from the first pipe body, and the third exhaust port is arranged at the second pipe body.

4. The vacuum pressure reducing exhaust assembly according to claim 3, wherein the first exhaust pipe further comprises a third pipe body provided at a side portion of the first pipe body and communicating with the second pipe body;

the first exhaust main body further comprises a second exhaust pipe, the second exhaust pipe comprises a fourth pipe body and a fifth pipe body, the fourth pipe body is arranged on one side, away from the first pipe body, of the third pipe body, the fifth pipe body is opposite to the fourth pipe body, the fourth pipe body is obliquely arranged and communicated with the fourth pipe body, the fourth pipe body is away from one end of the fifth pipe body, the first air inlet is formed in the one end, away from the fifth pipe body, of the fourth pipe body, and the first exhaust port is formed in the one end of the fourth pipe body.

5. The vacuum decompression exhaust assembly according to claim 4, wherein there are two of the first exhaust pipes and two of the second exhaust pipes, the two first exhaust pipes and the two second exhaust pipes are symmetrically arranged with respect to a vertical line passing through the first exhaust port, and the second pipes of the two first exhaust pipes and the fifth pipes of the two second exhaust pipes are communicated with each other by a second communication pipe; two third exhaust ports are arranged, and the two third exhaust ports are respectively arranged on the two second pipe bodies; the second exhaust main body is provided with two second air inlets, and the two second air inlets are respectively opposite to and communicated with the two third exhaust ports in a one-to-one correspondence manner.

6. A vacuum reduced pressure casting apparatus, comprising:

the mould is provided with a cavity and a decompression cavity communicated with the cavity;

a vacuum pumping device; and

the vacuum pressure reducing exhaust assembly according to any one of claims 1 to 5, disposed in the pressure reducing chamber, wherein the first air inlet communicates with the pressure reducing chamber, and the first exhaust port and the second exhaust port both communicate with the vacuum extractor.

7. The vacuum reduced-pressure casting apparatus according to claim 6, wherein the vacuum-pumping means includes a first vacuum-pumping tube, a second vacuum-pumping tube, a vacuum pump, and a vacuum tank, the vacuum tank is communicated with the first exhaust port and the second exhaust port through the first vacuum-pumping tube, respectively, and the vacuum pump is communicated with the vacuum tank through the second vacuum-pumping tube.

8. The vacuum reduced-pressure casting apparatus according to claim 7, wherein the evacuation apparatus further comprises a vacuum valve provided in the first evacuation pipe.

9. The vacuum pressure reduction casting apparatus according to claim 8, further comprising a shot punch and a pressure chamber, wherein the pressure chamber is provided with an opening and a pouring cavity communicating with the cavity, and the opening is provided at a side of the pressure chamber away from the mold and communicates with the pouring cavity;

the injection punch is arranged on one side, far away from the die, of the pressure chamber, and the injection punch is inserted into the pouring cavity through the opening and can move in the pouring cavity towards the direction close to or far away from the die.

10. The vacuum reduced-pressure casting apparatus according to claim 9, wherein the pressure chamber has a shot start position and a shot end position that is closer to the mold than the shot start position, the shot punch being movable between the shot start position and the shot end position;

the vacuum reduced-pressure casting device further comprises a controller, wherein the controller is respectively in communication connection with the exhaust valve and the vacuum valve, and is used for controlling the vacuum valve and the exhaust valve to be opened when the injection punch is located at the injection starting position, and controlling the exhaust valve to be closed and the vacuum valve to be closed in a delayed mode when the injection punch is located at the injection finishing position.

Images