Exhaust block for die-casting die

Abstract

The utility model relates to an exhaust block which comprises a block-shaped fixed die part, the fixed die part is provided with an exhaust channel for exhausting fluid such as molten metal and gas in a die, and the tail end of the exhaust channel is connected with a vacuum valve to form negative pressure for driving the fluid to flow along the exhaust channel. The vacuum valve is characterized by further comprising slow flow channels which are arranged between the exhaust channel and the vacuum valve and used for slowing down the flowing speed of fluid, the extending direction of the slow flow channels intersects with the extending direction of the exhaust channel, and the slow flow channels are located on the two sides of the exhaust channel respectively and provided with first wall faces for restraining the fluid from being exhausted in the opposite direction. The exhaust block has the advantages that molten metal can be prevented from directly impacting the vacuum valve by arranging the flow slowing channels between the exhaust channel and the vacuum valve, the flow slowing channels are located on the two sides of the exhaust channel respectively, the scheme that the flow slowing channels are connected with the exhaust channel is replaced, and therefore the overall length of the exhaust block is limited; and the space occupied by the exhaust block is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of die casting, in particular to an exhaust block for exhausting gas in a mold cavity. Background Art

[0002] Die casting is a process that uses a movable die and a fixed die to form a casting cavity. Molten metal is then poured into the cavity and cooled to form a correspondingly shaped casting. Therefore, if gas remains in the casting cavity during the die casting process and is entrained by the molten metal, the gas will occupy the space of the molten metal, causing defects such as porosity, bubbles, and poor filling in the resulting casting.

[0003] To this end, the applicant has proposed a venting structure. For details, please refer to the Chinese utility model application number CN202322304699.8 (publication number CN220992764U), "A Slag Ladle Venting Structure." Existing venting blocks typically consist of a movable mold portion connected to the movable mold and a fixed mold portion connected to the fixed mold. The movable and fixed mold portions combine to form an exhaust channel, which connects the casting cavity to a vacuum machine to exhaust gas within the cavity.

[0004] However, the above-mentioned exhaust block still has certain defects during actual use: First, the exhaust channel of the exhaust block is connected by an exhaust section and a buffer section, wherein the buffer section plays a role in reducing the impact force of the molten metal on the valve core of the vacuum machine, but it is equivalent to extending the length of the exhaust section, resulting in the exhaust block having a longer overall length and requiring a larger installation space; Second, during the exhaust process, the molten metal often adheres to and solidifies on the exhaust block to form metal residues. Since the ejection mechanism of the mold is usually located on the movable mold, the metal residues on the movable mold part of the exhaust block can be removed with the help of the ejection mechanism, while the metal residues adhered to the fixed mold part of the exhaust block are difficult to remove. Currently, operators usually need to remove them manually with handheld tools, which is inefficient and may scratch the mold. Therefore, there is still a need for further improvement of the existing exhaust block. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide an exhaust block which can avoid extending the exhaust section length while maintaining the buffering effect in view of the above-mentioned existing technical status.

[0006] The second technical problem to be solved by the present invention is to provide an exhaust block which can avoid the operator from manually removing the metal residue on the fixed mold part in response to the above-mentioned existing technical status.

[0007] The technical solution adopted by the present invention to solve the first technical problem is as follows: the exhaust block for the die-casting mold includes: a block-shaped fixed mold part, the fixed mold part is provided with an exhaust channel for exhausting the previous molten metal, gas and other fluids in the mold, and a vacuum valve is connected to the end of the exhaust channel to form a negative pressure to drive the above-mentioned fluid to flow along the exhaust channel, characterized in that:

[0008] It also includes a slow flow channel arranged between the exhaust channel and the vacuum valve and used to slow down the flow speed of the fluid. The extension direction of the slow flow channel intersects with the extension direction of the exhaust channel. The slow flow channels are respectively located on both sides of the exhaust channel. The slow flow channel is equipped with a first wall surface. The first wall surface inhibits the discharge of the above-mentioned fluid in the reverse direction, thereby causing the above-mentioned fluid to flow out toward the exhaust channel.

[0009] To guide the fluid from the reverse direction toward the exhaust passage, the first wall surface is preferably a flat or curved surface. Specifically, the first wall surface can be configured as an inclined plane opposite the inlet to block a portion of the fluid and guide it toward the exhaust passage, or as a curved surface connected to the inlet to deflect the fluid and slow its flow.

[0010] In order to further slow down the flow of the fluid, preferably, along the flow direction of the fluid, the slow flow channel is blocked by a second wall at the far downstream end to form a corner, and the second wall is provided on the opposite side of the first wall. Because the second wall forms a corner that blocks the fluid, the fluid turns again after slowly flowing through the first wall, further slowing down the flow of the fluid, and finally intersecting with the fluid in the exhaust channel and being discharged, forming resistance to the fluid in the exhaust channel, and also having a slow flow effect to slow down the flow speed. Therefore, the corner realizes a double slow flow effect, which can effectively slow down the flow of the fluid.

[0011] In order to remove the metal residues adhering to the exhaust channel, preferably, the fixed mold part is further provided with an ejection mechanism for ejecting the entire piece of metal residues on the exhaust channel and the slow-flow channel. The ejection mechanism includes a first rod. Correspondingly, a first through hole is provided at the corner for the first rod to pass through the corner from bottom to top. When the first rod passes through the corner from bottom to top, the entire piece of metal residues on the exhaust channel and the slow-flow channel can be ejected. The reason why the first rod is set at the corner is that compared with other positions, the corner will give the metal residue at this position a greater holding force due to its "corner". Therefore, if the first rod is set at other positions, the metal residue is prone to breakage due to uneven force. After the breakage, some of the metal residue still remains on the exhaust channel and needs to be manually removed by the operator.

[0012] To improve the flow-slowing effect of the slow-flow channel within a limited length, the slow-flow channel preferably includes at least two sub-channels, each of which has an open end on its corresponding first wall surface and is fluidically connected through its open end, while the first rod passes through the corner of the centrally located sub-channel. This design has a similar effect to placing the first rod at a corner, both of which aim to ensure that the force exerted by the first rod when ejecting metal residue is properly distributed, thereby preventing the metal residue from breaking.

[0013] In order to prevent the first rod from blocking the flow of fluid in the slow-flow channel during the exhaust process, preferably, a movable mold portion that can be moved downward to mate with the fixed mold portion is further provided above the fixed mold portion, and the ejection mechanism includes a second rod disposed on the periphery of the slow-flow channel. Correspondingly, the fixed mold portion is provided with a second through-hole for the second rod to pass through from bottom to top, and the lower end of the second rod is fixedly connected to the lower end of the first rod via a connecting member, so that when the second rod is in contact with the movable mold portion, the second rod can drive the first rod to retract downward into the first through-hole. When the movable mold portion is in contact with the fixed mold portion, the second rod contacts the movable mold portion, thereby driving the first rod to retract into the first through-hole. On the one hand, this can prevent the first rod from blocking the flow of fluid in the slow-flow channel during the exhaust process, and on the other hand, it can provide a precondition for the first rod to eject metal residue from bottom to top.

[0014] To prevent the first rod from potentially affecting fluid flow while retracted into the first through-hole, preferably, a first preset distance is maintained between the upper end of the first rod and the bottom of the slow-flow channel, and a second preset distance is maintained between the upper end of the second rod and the surface of the fixed mold portion relative to the movable mold portion, with the first preset distance being equal to the second preset distance. This design ensures that after the fixed mold portion and the movable mold portion mate, the first and second rods move the same distance, effectively retracting the first rod into the first through-hole and aligning with the bottom surface of the slow-flow channel, thereby minimizing any impact on fluid flow in the slow-flow channel.

[0015] To enable the first rod to eject metal residue from the bottom up, a vent block sleeve for connecting to the mold is preferably sleeved below the fixed mold portion. A driving member is provided between the vent block sleeve and the connecting member to drive the connecting member and the first rod upward. The driving member can be a push rod, an elastic member, or other component, and the vent block sleeve provides support for the driving member to generate the force.

[0016] Furthermore, in order to achieve the function of the driving member with an extremely simple structure, the driving member is preferably an elastic member that causes the connecting member to always have a tendency to move away from the exhaust block sleeve, and the driving member is connected to the exhaust block sleeve via a mounting seat. Using an elastic member such as a spring as the driving member, when the fixed mold portion and the movable mold portion are aligned, the second rod member contacts the movable mold portion and moves downward together with the connecting member, generating pressure on the driving member. Since the driving member is an elastic member, it will deform to "store energy." When the movable mold portion moves upward and separates from the fixed mold portion, the driving member will return to its original shape, thereby driving the connecting member and the first rod member to be ejected from the bottom up.

[0017] To prevent the connecting member from shifting in its movement direction under the force of the driving member, the connecting member is preferably plate-shaped, and the fixed mold portion further includes an accommodating space for accommodating the connecting member, the driving member, and the mounting seat. The inner walls of the accommodating space restrict the connecting member to vertical movement only along the length of the first rod. In fact, the inner walls of the accommodating space not only restrict the movement direction of the connecting member, but also leave space for the connecting member to move, thereby limiting the distance the connecting member can move.

[0018] The "fluid communication" referred to in the present invention refers to the spatial positional relationship between two components or parts (hereinafter collectively referred to as the first part and the second part), that is, the fluid (gas, liquid or a mixture of the two) can flow from the first part along the flow path and / or be transported to the second part. The first part and the second part can be directly connected, or the first part and the second part can be indirectly connected through at least one third party. The third party can be a fluid channel such as a pipe, channel, conduit, guide member, hole, groove, etc., or it can be a chamber allowing fluid to flow through, or a combination of the above.

[0019] Compared with the existing technology, the advantages of the present invention are: by providing a slow flow channel between the exhaust channel and the vacuum valve, the molten metal can be prevented from directly impacting the vacuum valve, and the slow flow channels are located on both sides of the exhaust channel, replacing the solution of connecting the slow flow channel and the exhaust channel in the existing technology, thereby limiting the overall length of the exhaust block and reducing the space occupied by the exhaust block. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic structural diagram of the exhaust block in an embodiment of the present utility model;

[0021] Figure 2 This is a schematic diagram of the explosion structure of the exhaust block in the embodiment of the present utility model;

[0022] Figure 3 This is a schematic structural diagram of the exhaust channel and the slow flow channel on the fixed mold part in an embodiment of the present utility model;

[0023] Figure 4 This is a schematic structural diagram of the accommodating space on the fixed mold part in an embodiment of the present utility model;

[0024] Figure 5 This is a schematic diagram of the cross-sectional structure of the exhaust block in the embodiment of the present utility model;

[0025] Figure 6 This is a schematic structural diagram of the ejection mechanism in an embodiment of the present utility model;

[0026] Figure 7 This is a schematic diagram of the exploded structure of the ejection mechanism in the embodiment of the present utility model;

[0027] Figure 8 This is a schematic diagram of the cross-sectional structure of the exhaust block in another angle in an embodiment of the present utility model;

[0028] Figure 9 This is a schematic diagram of the ejection mechanism in the embodiment of the present utility model in a retracted state;

[0029] Figure 10 This is a schematic diagram of the ejection mechanism in the embodiment of the present invention in the ejection state. DETAILED DESCRIPTION

[0030] The present invention will be described in further detail below with reference to specific embodiments.

[0031] like Figures 1 to 8 Shown is a preferred embodiment of the present utility model. Figures 1-2 As shown in FIG. 1 , the exhaust block for the die-casting mold in this embodiment includes a block-shaped fixed mold portion 1, on which an exhaust channel 2 is provided for exhausting the previous molten metal, gas and other fluids in the mold. A vacuum valve 3 is connected to the end of the exhaust channel 2 to form a negative pressure that drives the above-mentioned fluids to flow along the exhaust channel 2. Figure 3 As shown, the exhaust block also includes a slow flow channel 21 arranged between the exhaust channel 2 and the vacuum valve 3 and used to slow down the flow speed of the fluid. The extension direction of the slow flow channel 21 intersects with the extension direction of the exhaust channel 2, and the slow flow channel 21 is respectively located on both sides of the exhaust channel 2. The slow flow channel 21 is also equipped with a first wall 22. The first wall 22 inhibits the discharge of the above-mentioned fluid in the reverse direction, thereby causing the above-mentioned fluid to flow out toward the exhaust channel 2.

[0032] The specific structure of the slow flow channel 21 is as follows Figure 3As shown, the slow flow channel 21 in this embodiment has two sub-channels, and each sub-channel is provided with an open end 221 at its corresponding first wall 22 and is fluidically connected through its own open end 221, thereby improving the slow flow effect of the slow flow channel 21 within a limited length. Furthermore, the sub-channel closer to the exhaust channel 2 of the two sub-channels may be called the first sub-channel 211', and the sub-channel away from the exhaust channel 2 may be called the second sub-channel 211". The first wall 22 of the first sub-channel 211' is a plane wall, and the first wall 22 of the second sub-channel 211" is an arc-shaped curved wall to bypass the first wall 22 of the first sub-channel 211', but the functions of the first walls 22 of the above two sub-channels are the same, both of which guide the fluid from the reverse direction to be discharged toward the exhaust channel 2. Furthermore, along the flow direction of the fluid, the slow-flow channel 21 is blocked at its downstream distal end by a second wall 23, forming a corner 24. The second wall 23 is provided on the opposite side of the first wall 22. Because the second wall 23 forms the corner 24 that blocks the fluid, the fluid, after slowly flowing through the first wall 22, turns again, further slowing the flow rate of the fluid. The fluid eventually intersects with the fluid in the exhaust channel 2 and is discharged, creating resistance to the fluid in the exhaust channel 2 and also having a slow-flow effect that slows the flow rate. Therefore, the corner 24 achieves a double slow-flow effect, effectively slowing the flow rate of the fluid.

[0033] Regarding the problem that the molten metal easily adheres to the exhaust channel 2 and the slow flow channel 21 and forms metal residue after cooling, see Figures 5-7 The fixed mold portion 1 is also provided with an ejection mechanism 4 for ejecting the entire piece of metal residue on the exhaust channel 2 and the slow-flow channel 21. The ejection mechanism 4 includes a first rod 41. Correspondingly, a first through-hole 241 is provided at the corner 24 for the first rod 41 to pass through the corner 24 from bottom to top. The first rod 41 passes through the corner 24 from bottom to top, thereby ejecting the entire piece of metal residue on the exhaust channel 2 and the slow-flow channel 21. The reason why the first rod 41 is set at the corner 24 is that compared with other positions, the corner 24 has a greater holding force on the metal residue at this position due to its "corner". Therefore, if the first rod 41 is set at other positions, the metal residue is prone to uneven force and breakage. After the breakage, some of the metal residue still remains on the exhaust channel 2 and needs to be manually removed by the operator. Since the slow flow channel 21 in this embodiment has two sub-channels, the first rod 41 passes through the corner 24 of the sub-channel located in the center, that is, the corner of the first sub-channel 211' close to the exhaust channel 2, so that the force applied by the first rod 41 when ejecting the metal residue can be reasonably distributed to avoid the metal residue from breaking.

[0034] In addition, the design of the ejection mechanism 4 also needs to take into account avoiding affecting the function of the slow-flow channel 21 itself. Specifically, a movable mold part 11 that can move downward to mate with the fixed mold part 1 is provided above the fixed mold part 1. The ejection mechanism 4 also includes a second rod 42 arranged on the periphery of the slow-flow channel 21. Correspondingly, the fixed mold part 1 is provided with a second through hole 12 for the second rod 42 to pass through from bottom to top, and the lower end of the second rod 42 is fixedly connected to the lower end of the first rod 41 through a connecting member 43, so that when the second rod 42 is in conflict with the movable mold part 11, the second rod 42 can drive the first rod 41 to retract downward into the first through hole. When the movable mold part 11 and the fixed mold part 1 are aligned, the second rod 42 can contact the movable mold part 11 to drive the first rod 41 to retract into the first through hole 241. On the one hand, it can prevent the first rod 41 from blocking the fluid flow in the slow flow channel 21 during the exhaust process. On the other hand, it can also provide the precondition for the first rod 41 to push out the metal residue from the bottom up. Figure 8 As shown, the upper end of the first rod 41 is spaced a first predetermined distance d1 from the bottom of the slow-flow channel 21, while the upper end of the second rod 42 protrudes from the fixed mold portion 1 and is spaced a second predetermined distance d2 from the surface of the fixed mold portion 1 opposite the movable mold portion 11. The first predetermined distance d1 is equal to the second predetermined distance d2. In this embodiment, when the first rod 41 is in the ejected state, the first predetermined distance d1 and the second predetermined distance d2 are both 5 mm. This design ensures that after the fixed mold portion 1 and the movable mold portion 11 are aligned, the first rod 41 and the second rod 42 move the same distance, allowing the first rod 41 to retract into the first through-hole 241 and coincide with the bottom surface of the slow-flow channel 21. In this embodiment, since the first rod 41 is positioned on the first sub-channel 211' of the slow-flow channel 21, the cross-sectional shape of the corner 24 of the first sub-channel 211' is maintained as much as possible, minimizing the impact on the fluid flow in the first sub-channel 211'.

[0035] Finally, an exhaust block sleeve 13 for connection to the mold is sleeved beneath the fixed mold portion 1. A driver 44 is disposed between the exhaust block sleeve 13 and the connector 43, thereby driving the connector 43 and the first rod 41 upward. In this embodiment, the driver 44 is an elastic member, specifically a spring structure, which ensures that the connector 43 always tends to move away from the exhaust block sleeve 13. The driver 44 is connected to the exhaust block sleeve 13 via a mounting seat 45. The use of an elastic member such as a spring as the driver 44 ensures that when the fixed mold portion 1 and the movable mold portion 11 mate, the second rod 42 contacts the movable mold portion 11 and moves downward along with the connector 43, generating pressure on the driver 44. Because the driver 44 is an elastic member, it deforms and "stores energy." When the movable mold portion 11 moves upward and separates from the fixed mold portion 1, the driver 44 returns to its original shape, thereby driving the connector 43 and the first rod 41 to eject upward. The connecting member 43 in this embodiment is in the shape of a plate. Figure 4 A receiving space 14 for accommodating the connecting member 43, the driving member 44 and the mounting seat 45 is also provided on the fixed mold part 1. The inner wall of the receiving space 14 limits the connecting member 43 to move up and down only along the length direction of the first rod 41, and also leaves space for the connecting member 43 to move, thereby limiting the distance that the connecting member 43 moves.

[0036] The specific working process of the ejection mechanism 4 in this embodiment is as follows:

[0037] like Figure 9 As shown, at this time, the fixed mold part 1 and the movable mold part 11 are aligned, so the first rod 41 moves downward along with the second rod 42 that contacts the movable mold part 11, retracts into the first through hole 241 and enters the retracted state, and the driving member 44 is pressed by the connecting member 43 to store energy, and the exhaust channel 2 and the slow flow channel 21 work together to discharge the fluid in the mold; after the die casting work is completed, as shown Figure 10 As shown, the movable mold part 11 moves upward and separates from the fixed mold part 1, the driving member 44 restores its original shape and drives the first rod 41 from bottom to top through the first through hole 241, thereby ejecting the entire piece of metal residue adhering to the exhaust channel 2 and the slow flow channel 21.

Claims

1. An exhaust block for a die-casting mold, comprising: a block-shaped fixed mold portion (1), an exhaust channel (2) provided on the fixed mold portion (1) for exhausting fluids such as molten metal, gas, etc. previously contained in the mold, and a vacuum valve (3) connected to the end of the exhaust channel (2) to form a negative pressure for driving the fluid to flow along the exhaust channel (2), characterized in that: The invention also includes a slow-flow channel (21) arranged between the exhaust channel (2) and the vacuum valve (3) and used to slow down the flow speed of the fluid. The extension direction of the slow-flow channel (21) intersects with the extension direction of the exhaust channel (2). The slow-flow channel (21) is respectively located on both sides of the exhaust channel (2). The slow-flow channel (21) is equipped with a first wall surface (22). The first wall surface (22) inhibits the discharge of the above-mentioned fluid in the reverse direction, thereby causing the above-mentioned fluid to flow out toward the exhaust channel (2).

2. The exhaust block according to claim 1, characterized in that: The first wall surface (22) is a wall surface having a flat surface or a curved surface shape.

3. The exhaust block according to claim 2, characterized in that: Along the flow direction of the fluid, the slow flow channel (21) is blocked by a second wall (23) at the far end downstream to form a corner (24), and the second wall (23) is provided on the opposite side of the first wall (22).

4. The exhaust block according to claim 3, characterized in that: The fixed mold portion (1) is further provided with an ejection mechanism (4) for ejecting the entire piece of metal residue on the exhaust channel (2) and the slow flow channel (21); the ejection mechanism (4) comprises a first rod (41); and correspondingly, a first through hole (241) is provided at the corner (24) for the first rod (41) to pass through the corner (24) from bottom to top.

5. The exhaust block according to claim 4, characterized in that: The slow-flow channel (21) includes at least two sub-channels (211'; 211"), each of the sub-channels (211'; 211") is provided with an open end (221) at its corresponding first wall surface (22) and is fluidically connected through its respective open ends (221), and the first rod (41) passes through the corner (24) of the sub-channel (211'; 211") located at the center.

6. The exhaust block according to claim 4 or 5, characterized in that: A movable mold part (11) is also provided above the fixed mold part (1) and can be moved downward to mate with the fixed mold part (1). The ejection mechanism (4) includes a second rod (42) arranged on the periphery of the slow-flow channel (21). Correspondingly, the fixed mold part (1) is provided with a second through hole (12) for the second rod (42) to pass through from bottom to top, and the lower end of the second rod (42) is fixedly connected to the lower end of the first rod (41) through a connecting member (43), so that when the second rod (42) is in conflict with the movable mold part (11), the second rod (42) can drive the first rod (41) to retract downward into the first through hole (241).

7. The exhaust block according to claim 6, characterized in that: A first preset distance (d1) is left between the upper end of the first rod (41) and the bottom of the slow-flow channel (21); an upper end of the second rod (42) protrudes from the fixed mold part (1) and a second preset distance (d2) is left between the upper end of the second rod (42) and the surface of the fixed mold part (1) relative to the movable mold part (11); the first preset distance (d1) is equal to the second preset distance (d2).

8. The exhaust block according to claim 7, characterized in that: An exhaust block sleeve (13) for connecting to the mold is also sleeved below the fixed mold part (1), and a driving member (44) is provided between the exhaust block sleeve (13) and the connecting member (43), thereby driving the connecting member (43) and the first rod member (41) to move upward.

9. The exhaust block according to claim 8, characterized in that: The driving member (44) is an elastic member that allows the connecting member (43) to always have a tendency to move away from the exhaust block sleeve (13), and the driving member (44) is connected to the exhaust block sleeve (13) through a mounting seat (45).

10. The exhaust block according to claim 9, characterized in that: The connecting member (43) is plate-shaped, and the fixed mold part (1) is further provided with an accommodating space (14) for accommodating the connecting member (43), the driving member (44) and the mounting seat (45). The inner wall of the accommodating space (14) restricts the connecting member (43) from moving up and down only along the length direction of the first rod (41).

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