Vacuum decompression exhaust assembly and vacuum decompression casting device

Abstract

The present invention relates to a vacuum decompression exhaust assembly and a vacuum decompression casting device. When starting to inject molten metal into the cavity of the mold, the exhaust valve is opened and the vacuum pumping device is started. The vacuum pumping device evacuates the cavity, so that the gas in the cavity enters the first exhaust passage through the first air inlet. A part of the gas in the first exhaust passage directly enters the vacuum pumping device through the first exhaust port, and another part of the gas enters the second exhaust passage through the second air inlet and then enters the vacuum pumping device through the second exhaust port. When ending the injection of molten metal into the cavity, the exhaust valve is closed. Under the suction of the vacuum pumping device, the last part of the gas in the high-speed area in the cavity enters the vacuum pumping device through the first air inlet, the first exhaust passage, the second air inlet, the second exhaust passage and the second exhaust port, avoiding problems such as cold shuts caused by the unsmooth flow of the molten metal in the cavity due to incomplete exhaust of the gas in the cavity, and improving the quality of the casting.

Description

Technical Field

[0001] The present invention relates to the technical field of casting equipment, and particularly to a vacuum decompression exhaust assembly and a vacuum decompression casting device. Background Art

[0002] Some parts of an automotive engine can be obtained by a vacuum decompression casting process. During vacuum decompression casting, after the mold is closed, the molten metal is poured into the pressure chamber and the pressure chamber is sealed. The gas in the mold cavity is extracted by a vacuum pumping device, so that the molten metal fills the mold cavity under a vacuum state to obtain a metal casting. However, some metal castings obtained by the vacuum decompression casting process have quality problems such as cold shuts. Summary of the Invention

[0003] Based on this, it is necessary to provide a vacuum decompression exhaust assembly and a vacuum decompression casting device that can improve the quality of castings.

[0004] A vacuum decompression exhaust assembly includes:

[0005] A first exhaust main body, the first exhaust main body is provided with a first air inlet, a first air outlet and a first exhaust passage communicating the first air inlet and the first air outlet. The first air inlet is used for communicating with the cavity of the mold, and the first air outlet is used for communicating with a vacuum pumping device;

[0006] An exhaust valve, the exhaust valve is used to control the on-off between the first air outlet and the vacuum pumping device;

[0007] A second exhaust main body, the second exhaust main body is provided with a second air inlet, a second air outlet and a second exhaust passage communicating the second air inlet and the second air outlet. The second exhaust passage is communicated with the first exhaust passage through the second air inlet, and the second air outlet is used for communicating with the vacuum pumping device.

[0008] In one embodiment, the first exhaust main body is further provided with a third exhaust port, and the third exhaust port is communicated with the second air inlet so that the second exhaust passage is communicated with the first exhaust passage.

[0009] In one embodiment, the first exhaust main body includes a first exhaust pipe, the first exhaust pipe includes a first pipe body and a second pipe body communicated with the first pipe body. The second pipe body is inclined relative to the first pipe body. One end of the first pipe body away from the second pipe body is provided with the first air inlet, one end of the second pipe body away from the first pipe body is provided with the first air outlet, and the third exhaust port is arranged on the second pipe body.

[0010] In one embodiment, the first exhaust pipe further includes a third pipe body, the third pipe body is disposed on the side of the first pipe body and is communicated with the second pipe body; the first exhaust main body further includes a second exhaust pipe, the second exhaust pipe includes a fourth pipe body and a fifth pipe body, the fourth pipe body is disposed on the side of the third pipe body away from the first pipe body, the fifth pipe body is inclined relative to the fourth pipe body and is communicated with the fourth pipe body, the first air inlet is provided at one end of the fourth pipe body away from the fifth pipe body, and the first exhaust port is provided at one end of the fifth pipe body away from the fourth pipe body.

[0011] In one embodiment, there are two first exhaust pipes and two second exhaust pipes, the two first exhaust pipes and the two second exhaust pipes are symmetrically arranged about a perpendicular line passing through the first exhaust port, the second pipe bodies of the two first exhaust pipes and the fifth pipe bodies of the two second exhaust pipes are communicated through a second connecting pipe; there are two third exhaust ports, and the two third exhaust ports are respectively disposed 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 correspondingly opposite and communicated with the two third exhaust ports.

[0012] A vacuum pressure reducing casting device includes:

[0013] A mold, the mold is provided with a cavity and a pressure reducing cavity communicated with the cavity;

[0014] A vacuum pumping device; and

[0015] The vacuum pressure reducing exhaust assembly, the vacuum pressure reducing exhaust assembly is disposed in the pressure reducing cavity, the first air inlet is communicated with the cavity, and the first exhaust port and the second exhaust port are both communicated with the vacuum pumping device.

[0016] In one embodiment, the vacuum pumping device includes a first vacuum pumping pipe, a second vacuum pumping pipe, a vacuum pump and a vacuum tank, the vacuum tank is communicated with the first exhaust port and the second exhaust port respectively through the first vacuum pumping pipe, and the vacuum pump is communicated with the vacuum tank through the second vacuum pumping pipe.

[0017] In one embodiment, the vacuum pumping device further includes a vacuum valve, and the vacuum valve is disposed on the first vacuum pumping pipe.

[0018] In one embodiment, the vacuum pressure casting device further includes a shot piston and a shot sleeve. The shot sleeve is provided with an opening and a pouring cavity communicating with the cavity. The opening is provided on a side of the shot sleeve away from the mold and communicates with the pouring cavity. The shot piston is provided on a side of the shot sleeve away from the mold. The shot piston is inserted into the pouring cavity through the opening and can move in the pouring cavity in a direction close to or away from the mold.

[0019] In one embodiment, the shot sleeve has a shot start position and a shot end position relatively closer to the mold than the shot start position. The shot piston can move between the shot start position and the shot end position. The vacuum pressure casting device further includes a controller. The controller is respectively communicatively connected to the exhaust valve and the vacuum valve. The controller is configured to control the vacuum valve and the exhaust valve to open when the shot piston is at the shot start position, and to control the exhaust valve to close and the vacuum valve to close with a time delay when the shot piston is at the shot end position.

[0020] For the above-mentioned vacuum pressure exhaust assembly and vacuum pressure casting device, when starting to inject molten metal into the cavity of the mold, the exhaust valve is opened and the vacuum pumping device is started. The vacuum pumping device evacuates the cavity, so that the gas in the cavity enters the first exhaust passage through the first air inlet. A part of the gas in the first exhaust passage directly enters the vacuum pumping device through the first exhaust port, and another part of the gas enters the second exhaust passage through the second air inlet and then enters the vacuum pumping device through the second exhaust port, realizing the pressure reduction and exhaust of the cavity. When ending the injection of molten metal into the cavity, the exhaust valve is closed. At this time, the vacuum pumping device is communicated with the cavity through the first exhaust passage and the second exhaust passage. Under the suction of the vacuum pumping device, the last part of the gas in the high-speed area of the cavity enters the first exhaust passage through the first air inlet, then enters the second exhaust passage through the second air inlet, and finally enters the vacuum pumping device through the second exhaust port, avoiding problems such as incomplete discharge of the gas in the cavity resulting in poor flow of the molten metal in the cavity and cold shuts, and improving the quality of the casting. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 Schematic structural diagram of a vacuum decompression exhaust assembly according to an embodiment of the present invention;

[0024] Figure 2 Simplified structural diagram of a vacuum decompression casting device according to an embodiment of the present invention.

[0025] Explanation of reference numerals in the drawings: 10, vacuum decompression exhaust assembly; 11, first exhaust main body; 111, first air inlet; 112, first exhaust port; 113, first exhaust passage; 114, third exhaust port; 115, first exhaust pipe; 1151, first pipe body; 1152, second pipe body; 1153, third pipe body; 116, second exhaust pipe; 1161, fourth pipe body; 1162, fifth pipe body; 117, first connecting pipe; 118, second connecting pipe; 12, exhaust valve; 13, second exhaust main body; 131, second air inlet; 132, second exhaust port; 133, second exhaust passage; 20, mold; 22, fixed mold; 23, movable mold; 30, vacuum pumping device; 31, first vacuum pumping pipe; 32, second vacuum pumping pipe; 33, vacuum tank; 34, vacuum pump; 35, vacuum valve; 40, pressure chamber; 41, pouring cavity; 42, pouring port; 50, injection punch; 60, controller. Detailed implementation manners

[0026] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0027] Please refer to Figure 1 and Figure 2 , a vacuum decompression exhaust assembly 10 according to an embodiment of the present invention includes a first exhaust main body 11, an exhaust valve 12 and a second exhaust main body 13. The first exhaust main body 11 is provided with a first air inlet 111, a first exhaust port 112 and a first exhaust passage 113 connecting the first air inlet 111 and the first exhaust port 112. The first air inlet 111 is used to communicate with the cavity of the mold 20, the first exhaust port 112 is used to communicate with the vacuum pumping device 30, and the exhaust valve 12 is used to control the on-off between the first exhaust passage 113 and the vacuum pumping device 30. The second exhaust main body 13 is provided with a second air inlet 131, a second exhaust port 132 and a second exhaust passage 133 connecting the second air inlet 131 and the second exhaust port 132. The second exhaust passage 133 is connected to the first exhaust passage 113 through the second air inlet 131, and the second exhaust port 132 is used to communicate with the vacuum pumping device 30.

[0028] Optionally, the exhaust valve 12 is provided at the first exhaust port 112; alternatively, the exhaust valve 12 is provided on the first evacuation pipe 31 between the first exhaust port 112 and the evacuation device 30.

[0029] For the above-mentioned vacuum decompression exhaust assembly, when starting to inject molten metal into the cavity of the mold 20, the exhaust valve 12 is opened and the evacuation device 30 is started. The evacuation device 30 evacuates the cavity, so that the gas in the cavity enters the first exhaust passage 113 through the first air inlet 111. Part of the gas in the first exhaust passage 113 directly enters the evacuation device 30 through the first exhaust port 112, and another part of the gas enters the second exhaust passage 133 through the second air inlet 131, and then enters the evacuation device 30 through the second exhaust port 132, realizing the decompression exhaust of the cavity. When ending the injection of molten metal into the cavity, the exhaust valve 12 is closed. At this time, the evacuation device 30 is communicated with the cavity through the first exhaust passage 113 and the second exhaust passage 133. Under the suction of the evacuation device 30, the last part of the gas in the high-speed area of the cavity enters the first exhaust passage 113 through the first air inlet 111, then enters the second exhaust passage 133 through the second air inlet 131, and finally enters the evacuation device 30 through the second exhaust port 132, avoiding problems such as cold shuts caused by the unsmooth flow of molten metal in the cavity due to incomplete evacuation of the gas in the cavity, and improving the quality of the casting.

[0030] In one embodiment, referring to Figure 1 , the first exhaust body 11 is further provided with a third exhaust port 114, and the third exhaust port 114 is communicated with the second air inlet 131 to communicate the second exhaust passage 133 with the first exhaust passage 113. In this way, 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 air inlet 131.

[0031] It should be noted that the shape and size of the third exhaust port 114 can be set according to actual needs and are not specifically limited herein. In this embodiment, the third exhaust port 114 is a strip-shaped port, and the strip-shaped port extends along the length direction of the first exhaust passage 113, and the width of the strip-shaped port is 0.2 mm.

[0032] In one embodiment, referring to Figure 1, the first exhaust main body 11 includes a first exhaust pipe 115. The first exhaust pipe 115 includes a first pipe body 1151 and a second pipe body 1152 communicating with the first pipe body 1151. The second pipe body 1152 is inclined relative to the first pipe body 1151. One end of the first pipe body 1151 away from the second pipe body 1152 is provided with a first air inlet 111, one end of the second pipe body 1152 away from the first pipe body 1151 is provided with a first exhaust port 112, and a third exhaust port 114 is arranged on the second pipe body 1152. In this way, the second pipe body 1152 is inclined relative to the first pipe body 1151, and the third exhaust port 114 is arranged on the second pipe body 1152, which can avoid air leakage and improve the decompression exhaust effect.

[0033] Further, referring to Figure 1 , the first exhaust pipe 115 further includes a third pipe body 1153. The third pipe body 1153 is arranged on the side of the first pipe body 1151 and communicates with the second pipe body 1152. In this way, the exhaust volume of the first exhaust main body 11 can be increased, and the decompression exhaust efficiency can be improved.

[0034] Furthermore, the first exhaust main body 11 further includes a second exhaust pipe 116. The second exhaust pipe 116 includes a fourth pipe body 1161 and a fifth pipe body 1162. The fourth pipe body 1161 is arranged on the side of the third pipe body 1153 away from the first pipe body 1151. The fifth pipe body 1162 is inclined relative to the fourth pipe body 1161 and communicates with the fourth pipe body 1161. One end of the fourth pipe body 1161 away from the fifth pipe body 1162 is provided with a first air inlet 111, and one end of the fifth pipe body 1162 away from the fourth pipe body 1161 is provided with a first exhaust port 112. Specifically, the first pipe body 1151, the third pipe body 1153, and the fourth pipe body 1161 are connected through a first connecting pipe 117. In this way, the exhaust volume of the first exhaust main body 11 can be increased, and the decompression exhaust efficiency can be improved.

[0035] In this embodiment, referring to Figure 1 , there are two first exhaust pipes 115 and two second exhaust pipes 116. The two first exhaust pipes 115 are symmetrically arranged about the perpendicular line passing through the first exhaust port 112, and the two second exhaust pipes 116 are also symmetrically arranged about the perpendicular line passing through the first exhaust port 112. The second pipe bodies 1152 of the two first exhaust pipes 115 and the fifth pipe bodies 1162 of the two second exhaust pipes 116 are all connected through a second connecting 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 and communicated with the two third exhaust ports 114 one by one.

[0036] Referring to Figure 1 and Figure 2, A vacuum decompression casting device according to an embodiment of the present invention includes a mold 20, a vacuum pumping device 30, and the vacuum decompression exhaust assembly 10 of any one of the above embodiments. The mold 20 is provided with a cavity and a decompression cavity communicating with the cavity. The vacuum decompression exhaust assembly 10 is disposed in the decompression cavity. The first air inlet 111 communicates with the cavity, and both the first exhaust port 112 and the second exhaust port 132 communicate with the vacuum pumping device.

[0037] Specifically, the mold 20 includes a fixed mold 22 and a movable mold 23. The movable mold 23 and the fixed mold 22 cooperate to form a cavity, and the decompression cavity is disposed in the fixed mold 22.

[0038] In the above-mentioned vacuum decompression casting device, when starting to inject molten metal into the cavity of the mold 20, open the exhaust valve 12 and start the vacuum pumping device 30. The vacuum pumping device 30 evacuates the cavity, so that the gas in the cavity enters the first exhaust passage 113 through the first air inlet 111. Part of the gas in the first exhaust passage 113 directly enters the vacuum pumping device 30 through the first exhaust port 112, and another part of the gas enters the second exhaust passage 133 through the second air inlet 131, and then enters the vacuum pumping device 30 through the second exhaust port 132, realizing the decompression exhaust of the cavity. When ending the injection of molten metal into the cavity, close the exhaust valve 12. At this time, the vacuum pumping device 30 communicates with the cavity through the first exhaust passage 113 and the second exhaust passage 133. Under the suction of the vacuum pumping device 30, the last part of the gas in the high-speed area of the cavity enters the first exhaust passage 113 through the first air inlet 111, then enters the second exhaust passage 133 through the second air inlet 131, and finally enters the vacuum pumping device 30 through the second exhaust port 132, avoiding problems such as incomplete discharge of gas in the cavity leading to unsmooth flow of molten metal in the cavity and cold shuts, and improving the quality of castings.

[0039] In one embodiment, refer to Figure 1 and Figure 2 , The vacuum pumping device 30 includes a first vacuum pumping pipe 31, a second vacuum pumping pipe 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 pumping pipe 31, and the vacuum pump 34 is communicated with the vacuum tank 33 through the second vacuum pumping pipe 32. Specifically, the vacuum tank 33 is provided with a first communication port and a second communication port. The first vacuum pumping pipe 31 is disposed at the first communication port, and the second vacuum pumping pipe 32 is disposed at the second communication port. When vacuum decompression is required, turn on the vacuum pump 34 to pump the gas in the cavity into the vacuum tank 33 for storage through the first exhaust passage 113 and the second exhaust passage 133 respectively.

[0040] Further, refer to Figure 2, the vacuum pumping device 30 further includes a vacuum valve 35, and the vacuum valve 35 is provided on the first vacuum pumping pipe 31. Optionally, the vacuum valve 35 is a vacuum solenoid valve. When starting to inject molten metal into the cavity of the mold 20, the exhaust valve 12 and the vacuum valve 35 are opened, and the vacuum pump 34 is started. The vacuum pump 34 evacuates the cavity, so that the gas in the cavity enters the first exhaust passage 113 through the first air inlet 111. A part of the gas in the first exhaust passage 113 directly enters the vacuum tank 33 through the first exhaust port 112, and another part of the gas enters the second exhaust passage 133 through the second air inlet 131, and then enters the vacuum tank 33 through the second exhaust port 132, realizing the decompression and exhaust of the cavity. When the injection of molten metal into the cavity is completed, the exhaust valve 12 is closed. Under the suction of the vacuum pump 34, the last part of the gas in the high-speed area of the cavity enters the first exhaust passage 113 through the first air inlet 111, then enters the second exhaust passage 133 through the second air inlet 131, and finally enters the vacuum tank 33 through the second exhaust port 132, avoiding problems such as cold shuts caused by the unsmooth flow of molten metal in the cavity due to incomplete exhaust of the gas in the cavity, and improving the quality of the casting.

[0041] Furthermore, the vacuum pumping device 30 further includes a vacuum pressure detector for detecting the vacuum pressure in the vacuum tank 33. In this way, by setting the vacuum pressure detector, the vacuum pressure detector can detect the vacuum pressure in the vacuum tank 33 in real time, so as to grasp the vacuum pressure in the vacuum tank 33 in real time and avoid excessive vacuum pressure in the vacuum tank 33.

[0042] In one embodiment, refer to Figure 2 , the vacuum decompression casting device further includes a shot piston 50 and a shot sleeve 40. The shot sleeve 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 the side of the shot sleeve 40 away from the mold 20 and is communicated with the pouring cavity 41. The shot piston 50 is provided on the side of the shot sleeve 40 away from the mold 20. The shot piston 50 is inserted into the pouring cavity 41 through the opening and can move in the pouring cavity 41 in a direction close to or away from the mold 20. Further, the shot sleeve 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 mold 20 is closed to make the cavity a well-sealed space. Molten metal is injected into the pouring cavity 41 through the pouring gate 42. After pouring is completed, the shot piston 50 is started. The shot piston 50 moves in a direction close to the mold 20, first closes the pouring gate 42, and then gradually injects the molten metal into the cavity to form.

[0043] Furthermore, refer to Figure 2, the shot sleeve 40 has a shot start position and a shot end position closer to the mold 20 relative to the shot start position, and the shot piston 50 is capable of moving between the shot start position and the shot end position. The vacuum pressure reduction casting device further includes a controller 60, and the controller 60 is configured to control the vacuum valve 35 and the exhaust valve 12 to open when the shot piston 50 is at the shot start position, and to control the exhaust valve 12 to close and the vacuum valve 35 to close with a time delay when the shot piston 50 is at the shot end position. During die casting, the mold 20 is closed to form a well-sealed cavity. Molten metal is injected into the pouring cavity 41 through the pouring gate 42. After pouring is completed, the shot piston 50 is started, and the shot piston 50 moves in a direction closer to the mold 20 to close the pouring gate 42. At this time, the controller 60 controls the exhaust valve 12 and the vacuum valve 35 to open, and the vacuum pump 34 evacuates the cavity, so that the gas in the cavity enters the first exhaust passage 113 through the first air inlet 111. A part of the gas in the first exhaust passage 113 directly enters the vacuum tank 33 through the first exhaust port 112, and another part of the gas enters the second exhaust passage 133 through the second air inlet 131 and then enters the vacuum tank 33 through the second exhaust port 132, realizing pressure reduction and exhaust of the cavity. During the evacuation process, when the shot piston 50 continues to move in a direction closer to the mold 20 to reach the position where molten metal is injected into the cavity, the controller 60 controls the exhaust valve 12 to close immediately and the vacuum valve 35 to close with a time delay. Under the suction of the vacuum pump 34, the last part of the gas in the high-speed section of the cavity enters the first exhaust passage 113 through the first air inlet 111, then enters the second exhaust passage 133 through the second air inlet 131, and finally enters the vacuum tank 33 through the second exhaust port 132, avoiding problems such as uneven flow of molten metal in the cavity and cold shut caused by incomplete evacuation of the gas in the cavity, and improving the quality of the casting.

[0044] It can be understood that the vacuum valve 35 has a time delay function. Among them, the time delay of the vacuum valve 35 can be set according to actual needs and is not specifically limited here.

[0045] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0046] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0047] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0049] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it may be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0050] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as falling within the scope described in this specification.

[0051] The above-described embodiments merely represent several implementation manners of the present invention. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A vacuum decompression exhaust assembly, characterized in that, Comprising: A first exhaust body, the first exhaust body is provided with a first air inlet, a first exhaust port and a first exhaust passage communicating the first air inlet with the first exhaust port, the first air inlet is used for communicating with the cavity of the mold, and the first exhaust port is used for communicating with a vacuum pumping device; An exhaust valve, the exhaust valve is used for controlling the on-off between the first exhaust port and the vacuum pumping device; A second exhaust body, the second exhaust body is provided with a second air inlet, a second exhaust port and a second exhaust passage communicating 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 used for communicating with the vacuum pumping device; The first exhaust body is further provided with a third exhaust port, the third exhaust port is a strip-shaped port, the strip-shaped port extends along the length direction of the first exhaust passage, the third exhaust port is communicated with the second air inlet so that the second exhaust passage is communicated with the first exhaust passage; the first exhaust body includes a first exhaust pipe, the first exhaust pipe includes a first pipe body and a second pipe body communicated with the first pipe body, the second pipe body is inclined relative to the first pipe body, the first air inlet is arranged at one end of the first pipe body away from the second pipe body, the first exhaust port is arranged at one end of the second pipe body away from the first pipe body, and the third exhaust port is arranged on the second pipe body; the first exhaust pipe further includes a third pipe body, the third pipe body is arranged at the side of the first pipe body and communicated with the second pipe body; the first exhaust body further includes a second exhaust pipe, the second exhaust pipe includes a fourth pipe body and a fifth pipe body, the fourth pipe body is arranged at one side of the third pipe body away from the first pipe body, the fifth pipe body is inclined relative to the fourth pipe body and communicated with the fourth pipe body, the first air inlet is arranged at one end of the fourth pipe body away from the fifth pipe body, and the first exhaust port is arranged at one end of the fifth pipe body away from the fourth pipe body.

2. The vacuum decompression exhaust assembly according to claim 1, characterized in that There are two of the first exhaust pipes and the second exhaust pipes, the two first exhaust pipes and the two second exhaust pipes are symmetrically arranged about a perpendicular line passing through the first exhaust port, the second pipe bodies of the two first exhaust pipes and the fifth pipe bodies of the two second exhaust pipes are communicated through a second connecting pipe; there are two of the third exhaust ports, and the two third exhaust ports are respectively arranged on the two second pipe bodies; the second exhaust 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 one-to-one correspondence.

3. A vacuum pressure casting device, characterized in that, Comprising: A mold, the mold is provided with a cavity and a decompression cavity communicated with the cavity; A vacuum pumping device; And The vacuum decompression exhaust assembly as claimed in claim 1 or 2, 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 both communicated with the vacuum pumping device.

4. The vacuum pressure reduction casting device according to claim 3, wherein, The vacuum pumping device 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 respectively through the first vacuum pumping tube, and the vacuum pump is communicated with the vacuum tank through the second vacuum pumping tube.

5. The vacuum pressure-reducing casting device according to claim 4, wherein, The vacuum pumping device further includes a vacuum valve, and the vacuum valve is arranged on the first vacuum pumping tube.

6. The vacuum pressure reduction casting device according to claim 5, wherein, The vacuum pressure casting device further includes a shot sleeve and a pressure chamber. The pressure chamber is provided with an opening and a pouring cavity communicated with the cavity. The opening is arranged on the side of the pressure chamber away from the mold and is communicated with the pouring cavity. The shot sleeve is arranged on the side of the pressure chamber away from the mold. The shot sleeve is inserted into the pouring cavity through the opening and can move in the pouring cavity in a direction close to or away from the mold.

7. The vacuum pressure reducing casting device according to claim 6, characterized in that, The pressure chamber has a shot start position and a shot end position closer to the mold relative to the shot start position. The shot sleeve can move between the shot start position and the shot end position.

8. The vacuum pressure reducing casting device according to claim 7, characterized in that, The vacuum pressure casting device further includes a controller. The controller is respectively communicatively connected with the exhaust valve and the vacuum valve. The controller is used to control the opening of the vacuum valve and the exhaust valve when the shot sleeve is at the shot start position, and to control the closing of the exhaust valve and the delayed closing of the vacuum valve when the shot sleeve is at the shot end position.

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