A low pressure casting machine

Abstract

This utility model discloses a low-pressure casting machine, relating to the technical field of low-pressure casting machines. The utility model includes a low-pressure casting machine body, a holding furnace, a transport mechanism, and a lifting mechanism. The low-pressure casting machine body is equipped with a mold. A riser pipe is located at the top of the holding furnace. The transport mechanism transports the holding furnace laterally to a position below the low-pressure casting machine body. The lifting mechanism is used to lift the holding furnace, connecting the riser pipe to the mold cavity. A sleeve is provided on the low-pressure casting machine body. A cylinder is located at the top of the holding furnace, and the cylinder is inserted into the sleeve. A guide groove is provided on the cylinder, including a connected spiral groove and a vertical groove. A ring is fitted onto the cylinder. A sliding pin is provided on the inner wall of the ring, engaging with the guide groove. A baffle is provided on the outer wall of the ring. When the sliding pin is at the top of the spiral groove, the baffle blocks the riser pipe. An elastic element is provided on the cylinder to lift the ring upwards. This utility model prevents dust and debris from falling into the riser pipe.

Description

Technical Field

[0001] This utility model relates to the field of low-pressure casting machine technology, and specifically to a low-pressure casting machine. Background Technology

[0002] Low-pressure casting is an advanced process widely used in the forming of metal parts such as aluminum alloys and magnesium alloys. Its basic principle is to introduce compressed gas into a sealed, insulated furnace chamber, creating pressure on the surface of the molten metal. This forces the molten metal to rise along the riser pipe, fill the mold cavity, and solidify under pressure, ultimately forming a casting.

[0003] Existing low-pressure casting machines typically include a frame, a mold mounted on the frame, a holding furnace, and a mechanism for transporting and lifting the holding furnace below the frame. Before casting, the holding furnace needs to be transported to the working position and lifted by the lifting mechanism so that the riser pipe on the holding furnace connects with the gating system of the mold (such as the lower mold or insert pipe), thereby forming a complete molten metal filling channel.

[0004] However, this connection method has drawbacks. During the transportation and placement of the holding furnace, the upper end of the riser pipe is usually directly exposed, making it easy for dust, impurities, or accidentally dropped foreign objects in the environment to fall into the riser pipe. These contaminants will enter the mold cavity along with the molten metal during the casting process, causing defects such as slag inclusions and porosity in the castings, affecting the yield and quality of the castings. Utility Model Content

[0005] To address the aforementioned shortcomings of existing technologies, this invention proposes a low-pressure casting machine. This invention can prevent dust and debris from falling into the riser pipe, thereby avoiding defects in castings caused by foreign matter from the source and improving the yield and quality of castings.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A low-pressure casting machine includes a low-pressure casting machine body, a holding furnace, a transport mechanism, and a lifting mechanism. The low-pressure casting machine body is equipped with a mold. The top of the holding furnace is equipped with a riser pipe. The transport mechanism transports the holding furnace laterally to a position below the low-pressure casting machine body. The lifting mechanism is used to lift the holding furnace, connecting the riser pipe to the cavity of the mold. The low-pressure casting machine body is equipped with a sleeve. The top of the holding furnace is equipped with a cylinder, which is inserted into the sleeve. The cylinder is equipped with a guide groove, including a spiral groove and a vertical groove. A ring is fitted onto the cylinder. The inner wall of the ring is equipped with a sliding pin, which engages with the guide groove. The outer wall of the ring is equipped with a baffle plate. When the sliding pin is at the top of the spiral groove, the baffle plate blocks the riser pipe. An elastic element is provided on the cylinder to lift the ring upwards.

[0007] Furthermore, the heat preservation furnace includes a furnace body and a furnace cover, and the furnace cover is provided with the liquid riser pipe and the cylinder.

[0008] Furthermore, a flexible curtain is provided around the periphery of the shield.

[0009] Furthermore, the ring body includes two semi-rings that are detachably connected, and one semi-ring is provided with the sliding pin and the cover plate.

[0010] Furthermore, the low-pressure casting machine body includes a frame, a worktable is provided in the middle of the frame, the mold and mold clamping mechanism are provided above the worktable, and an insertion tube is provided at the bottom of the worktable. The insertion tube communicates with the cavity of the mold. When the sliding pin is located in the vertical groove, the insertion tube is inserted into the liquid riser pipe.

[0011] Furthermore, the mold includes an upper mold and a lower mold, and the mold clamping mechanism includes a top plate, a top plate guide, a top plate drive, a side plate, a side plate guide, and a side plate drive. The top plate is vertically slidably connected to the frame through the top plate guide. The top plate drive is used to drive the top plate to rise and fall. The bottom of the top plate is provided with the upper mold, and two side plates are symmetrically provided. Both side plates are longitudinally slidably connected to the frame through the side plate guide. The side plate drive is used to drive the side plates to move longitudinally, and the two side plates are used to clamp the lower mold.

[0012] Furthermore, the transport mechanism includes a transport vehicle, a transport guide, and a transport drive. The transport vehicle is used to carry the heat preservation furnace. The transport vehicle is laterally slidably connected to the bottom of the frame through the transport guide. The transport drive is used to drive the transport vehicle to move laterally.

[0013] Furthermore, lifting plates are provided on both longitudinal sides of the heat preservation furnace. The lifting mechanism includes a lifting support frame, a lifting drive component, a lifting frame, and a lifting guide component. The lifting support frame is located at the bottom of the frame. The lifting drive component is provided on the lifting support frame. The lifting drive component is used to drive the lifting frame to lift and lower. The lifting frame is used to lift the lifting plate. The lifting frame is vertically slidably connected to the lifting support frame through the lifting guide component.

[0014] The beneficial effects of this utility model are: 1. The automatic opening and closing function of the upper opening of the riser pipe is achieved through a ring body, a baffle plate, and a sliding pin structure that cooperates with the guide groove on the cylinder. When the holding furnace has not risen to the working position (the sliding pin is located at the top of the spiral groove), the baffle plate blocks the riser pipe under the action of the elastic element, forming a physical barrier. This effectively prevents dust, debris, etc. from falling into the riser pipe, thus avoiding defects in the casting caused by foreign matter from the source, and improving the yield and quality of the casting.

[0015] 2. The insertion and connection of the cylinder and sleeve constitutes the initial coarse positioning. During the lifting mechanism's process of raising the holding furnace, the cylinder inserts into the sleeve, and the sliding pin moves relative to it along the spiral groove, forcing the ring and the baffle to rotate and descend. This process automatically corrects minor circumferential and radial deviations between the holding furnace and the low-pressure casting machine body. When the sliding pin enters the vertical groove, it signifies that the alignment is complete. At this point, the holding furnace can be finally vertically lifted, allowing the insertion tube to be precisely inserted into the riser pipe. This guiding structure greatly reduces the stringent requirements for the positioning accuracy of the transport mechanism, avoids collision damage caused by misalignment between the riser pipe and the insertion tube, protects the equipment, and improves the reliability and safety of the docking.

[0016] 3. The entire anti-fouling and guiding alignment process is completed automatically by the mechanical structure, without the need for additional sensors or driving components. The structure is simple, reliable, and inexpensive.

[0017] 4. The ring body uses two detachable half-rings for easy installation, maintenance and replacement.

[0018] 5. Flexible curtains are installed around the baffle, which can more effectively fit the surface of the furnace cover, forming a more complete seal and protection, and further enhancing the dust prevention effect. Attached Figure Description

[0019] Figure 1 This is a 3D diagram of a low-pressure casting machine; Figure 2 This is a front view of a low-pressure casting machine; Figure 3 This is a left view of a low-pressure casting machine; Figure 4 It is a 3D diagram of a low-pressure casting machine after removing the heat preservation furnace; Figure 5 This is a front view of a low-pressure casting machine after removing the heat preservation furnace; Figure 6 It is a 3D view of the heat preservation furnace; Figure 7 It is a 3D view of the furnace lid; Figure 8 This is the front view of the furnace lid; Figure 9 It is a three-dimensional view of the furnace cover after removing the baffle and the ring body; Figure 10 It is a three-dimensional diagram of the ring and the shield.

[0020] Explanation of reference numerals in the attached figures: 1-Low-pressure casting machine body; 11-Frame; 12-Worktable; 13-Mold clamping mechanism; 131-Top plate; 132-Top plate guide; 1321-Upper synchronous plate; 133-Top plate drive; 134-Side plate; 135-Side plate guide; 1351-Side synchronous plate; 136-Side plate drive; 14-Insertion tube; 15-Sleeve. 2-Insulation furnace, 21-Furnace body, 22-Furnace cover, 23-Liquid riser pipe, 24-Cylinder, 241-Guide groove, 241a-Spiral groove, 241b-Vertical groove, 25-Ring body, 251-Sliding pin, 252-Blinding plate, 253-Flexible curtain, 26-Elastic element, 27-Lifting plate 3-Transportation mechanism, 31-Transport vehicle, 32-Transportation guide, 33-Transportation drive component, 4-Lifting mechanism, 41-Lifting support frame, 42-Lifting drive component, 43-Lifting frame, 44-Lifting guide component. Detailed Implementation

[0021] To better understand this utility model, it will be further described below with reference to the accompanying drawings. It is worth noting that in the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings. They are used for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0022] Example: See Figures 1 to 10 A low-pressure casting machine includes a low-pressure casting machine body 1, a holding furnace 2, a transport mechanism 3, and a lifting mechanism 4.

[0023] See Figure 1 The low-pressure casting machine body 1 includes a frame 11. A worktable 12 is fixedly installed in the middle of the frame 11. A mold and a mold clamping mechanism 13 are provided above the worktable 12.

[0024] The mold consists of an upper mold and a lower mold.

[0025] See Figure 1 The mold clamping mechanism 13 includes a top plate 131, a top plate guide 132, a top plate drive 133, a side plate 134, a side plate guide 135, and a side plate drive 136.

[0026] See Figure 1The top plate 131 is vertically slidably connected to the frame 11 via top plate guide members 132. Specifically, the top plate guide member 132 is a rod structure, and four top plate guide members 132 are provided. All four top plate guide members 132 are fixedly installed on the top surface of the top plate 131, and the same upper synchronous plate 1321 is fixedly installed on the top of the four top plate guide members 132. The four top plate guide members 132 are vertically slidably engaged with the frame 11.

[0027] See Figure 1 The top plate drive component 133 is used to drive the top plate 131 to rise and fall. Specifically, the top plate drive component 133 (such as a hydraulic cylinder) is fixedly installed on the upper part of the frame 11, the piston rod of the top plate drive component 133 is set upward, and the piston rod of the top plate drive component 133 is fixedly installed on the upper synchronous plate 1321.

[0028] The top plate 131 has an upper mold fixedly installed at its bottom.

[0029] When the piston rod of the top plate drive component 133 extends upward, it pushes the upper synchronous plate 1321 upward. The upper synchronous plate 1321 drives the four top plate guide components 132 to move upward together, and the four top plate guide components 132 drive the top plate 131 to move upward. The top plate 131 then drives the upper mold to move upward together. Conversely, when the piston rod of the top plate drive component 133 retracts downward, the upper synchronous plate 1321, the four top plate guide components 132, the top plate 131, and the upper mold all move downward together.

[0030] See Figure 3 Two side plates 134 are symmetrically arranged. Both side plates 134 are longitudinally slidably connected to the frame 11 through side plate guide members 135. Specifically, the side plate guide members 135 are also rod structures, and four side plate guide members 135 are provided. The four side plate guide members 135 are fixedly installed on the side plates 134, and the other end of the four side plate guide members 135 is fixedly installed on the same side synchronous plate 1351. The four side plate guide members 135 slide in cooperation with the frame 11 in the longitudinal direction.

[0031] See Figure 3 The side plate drive component 136 (such as a hydraulic cylinder) is used to drive the side plate 134 to move longitudinally. Specifically, the side plate drive component 136 is fixedly mounted on the frame 11, and the piston rod of the side plate drive component 136 is fixedly mounted together with the side synchronization plate 1351.

[0032] See Figure 3When the piston rods of both side plate drive members 136 extend longitudinally, the distance between the two side synchronization plates 1351 increases, and the side synchronization plates 1351 drive the side plates 134 to move longitudinally together, thus increasing the distance between the two side plates 134. Conversely, when the piston rods of both side plate drive members 136 retract longitudinally, the distance between the two side synchronization plates 1351 decreases, thus decreasing the distance between the two side plates 134, so that the two side plates 134 can clamp the lower mold placed on the top surface of the worktable 12.

[0033] See Figure 4 and Figure 5 A tube 14 is fixedly installed at the bottom of the worktable 12. The tube 14 is connected to the cavity of the mold (the gate of the lower mold) through an internal flow channel. In addition, a sleeve 15 is fixedly installed on the frame 11 or the worktable 12. Preferably, in this embodiment, a sleeve 15 is fixedly installed at the bottom of the worktable 12.

[0034] See Figure 6 The heat preservation furnace 2 includes a furnace body 21 and a furnace cover 22.

[0035] See Figure 7 , Figure 8 and Figure 9 A riser pipe 23 and a cylinder 24 are fixedly installed on the furnace cover 22. A guide groove 241 is machined on the outer wall of the cylinder 24. This guide groove 241 consists of a spiral groove 241a and a vertical groove 241b connected to the bottom of the spiral groove 241a. A ring 25 is fitted over the cylinder 24. See also... Figure 10 A sliding pin 251 is fixed to the inner wall of the ring body 25, which extends into and can slide within the guide groove 241. A baffle 252 is fixed to the outer wall of the ring body 25, and the shape and size of the baffle 252 are preferably designed to completely cover the upper opening of the riser tube 23.

[0036] The ring body 25 includes two detachably connected half-rings for easy installation, maintenance, and replacement. Specifically, the two half-rings can be assembled together using bolts and nuts, and separated by unscrewing the nuts and bolts. The sliding pin 251 and the cover plate 252 are fixedly mounted on one of the half-rings.

[0037] See Figure 6 To further enhance the dustproof effect, a flexible curtain 253 (such as a high-temperature resistant silicone brush or ceramic fiber cloth) can be installed around the perimeter of the cover 252 to allow it to better fit the surface of the furnace cover 22.

[0038] See Figure 6An elastic element 26 is also provided on the cylinder 24. The elastic element 26 can be a compression spring sleeved on the cylinder 24, with its lower end abutting against the connection position between the cylinder 24 and the furnace cover 22, and its upper end abutting against the bottom surface of the ring 25. The elastic element 26 provides a continuous upward pushing force to the ring 25. Lifting plates 27 are also fixed on both longitudinal sides of the heat preservation furnace 2.

[0039] See Figure 1 and Figure 5 The transport mechanism 3 includes a transport vehicle 31, a transport guide 32, and a transport drive 33. The transport vehicle 31 carries the holding furnace 2. The transport vehicle 31 is laterally slidably connected to the bottom of the frame 11 via the transport guide 32 (such as a guide rail slider structure). The transport drive 33 (such as a motor-driven lead screw and nut structure) drives the transport vehicle 31 to move laterally, thereby transporting the holding furnace 2 into or out of the working position below the low-pressure casting machine body 1.

[0040] See Figure 1 and Figure 2 The lifting mechanism 4 includes a lifting support frame 41, a lifting drive component 42, a lifting frame 43, and a lifting guide component 44. The lifting support frame 41 is fixedly installed at the bottom of the frame 11. The lifting drive component 42 (such as a hydraulic cylinder or electric push rod) is fixedly installed on the lifting support frame 41, and its piston rod is used to drive the lifting frame 43 to perform lifting movements. The lifting frame 43 is used to hold the lifting plates 27 on both sides of the holding furnace 2 when it is raised. The lifting frame 43 is vertically slidingly connected to the lifting support frame 41 through the lifting guide component 44 (such as a guide column and guide sleeve structure) to ensure a smooth lifting process.

[0041] The working process of this embodiment is as follows: Initial state: The transport mechanism 3 transports the holding furnace 2 to the working position directly below the frame 11. At this time, under the elastic force of the elastic element 26, the ring 25 is pushed to its highest position, and the sliding pin 251 on the ring 25 is located at the top of the spiral groove 241a in the guide groove 241. At the same time, the baffle 252 blocks the riser pipe 23 from falling in, preventing foreign objects from entering and avoiding defects caused by foreign objects in the casting from the source, thus improving the yield and quality of the casting.

[0042] Docking Process: The lifting mechanism 4 is activated, driving the lifting frame 43 to rise and lift the lifting plate 27, thereby causing the entire insulation furnace 2 to move upward. The sleeve 15 fixed on the worktable 12 begins to engage with the cylinder 24 on the insulation furnace 2 for initial alignment. As the insulation furnace 2 continues to rise, the cylinder 24 cannot move laterally due to the restriction of the sleeve 15, so the sliding pin 251 on the ring 25 moves downward relative to the guide groove 241. Under the guidance of the spiral groove 241a, the sliding pin 251 drives the entire ring 25 to rotate and move downward. The rotation of the ring 25 causes the baffle 252 to rotate synchronously, thereby gradually opening the opening of the riser pipe 23. At the same time, this rotational descent process automatically corrects the circumferential position of the insulation furnace 2.

[0043] Operating status: When the sliding pin 251 moves from the spiral groove 241a to the vertical groove 241b, it means that the baffle 252 has been fully opened and the alignment has been completed. Afterward, the holding furnace 2 continues to be vertically lifted, and the sliding pin 251 simply slides down within the vertical groove 241b. Finally, the insertion tube 14 on the worktable 12 is precisely inserted into the riser pipe 23 of the holding furnace 2, and the equipment enters the operating state where low-pressure casting can be performed.

[0044] Reset process: After casting is completed, the lifting mechanism 4 drives the holding furnace 2 to descend, and the insertion tube 14 exits from the riser pipe 23. During the descent of the holding furnace 2, the sliding pin 251 moves upward along the vertical groove 241b. When it reaches the connection between the vertical groove 241b and the spiral groove 241a, under the elastic force of the elastic element 26, the sliding pin 251 is forced into the spiral groove 241a, pushing the ring 25 to rotate and rise, finally causing the cover plate 252 to rotate back to its original position and cover the riser pipe 23, completing the automatic protection.

[0045] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A low-pressure casting machine, comprising a low-pressure casting machine body, a holding furnace, a conveying mechanism, and a lifting mechanism, wherein a mold is mounted on the low-pressure casting machine body, a riser pipe is mounted on the top of the holding furnace, the conveying mechanism transports the holding furnace laterally to a position below the low-pressure casting machine body, and the lifting mechanism is used to lift the holding furnace, thereby connecting the riser pipe with the cavity of the mold, characterized in that, The low-pressure casting machine body is provided with a sleeve, and the top of the heat preservation furnace is provided with a cylinder. The cylinder and the sleeve are inserted and matched. The cylinder is provided with a guide groove, which includes a spiral groove and a vertical groove that are connected. A ring is fitted on the cylinder. The inner side wall of the ring is provided with a sliding pin, which matches the guide groove. The outer side wall of the ring is provided with a baffle. When the sliding pin is located at the top of the spiral groove, the baffle blocks the liquid riser pipe. The cylinder is provided with an elastic element, which is used to lift the ring upward.

2. The low-pressure casting machine according to claim 1, characterized in that, The heat preservation furnace includes a furnace body and a furnace cover, and the furnace cover is provided with the liquid riser pipe and the cylinder.

3. A low-pressure casting machine according to claim 1, characterized in that, The periphery of the baffle is provided with a flexible curtain.

4. A low-pressure casting machine according to claim 1, characterized in that, The ring body includes two semi-rings that are detachably connected, and one semi-ring is provided with the sliding pin and the cover plate.

5. A low-pressure casting machine according to any one of claims 1-4, characterized in that, The low-pressure casting machine body includes a frame, a worktable in the middle of the frame, a mold and a mold clamping mechanism above the worktable, and an insertion tube at the bottom of the worktable. The insertion tube communicates with the cavity of the mold. When the sliding pin is located in the vertical groove, the insertion tube is inserted into the liquid riser pipe.

6. A low-pressure casting machine according to claim 5, characterized in that, The mold includes an upper mold and a lower mold. The mold clamping mechanism includes a top plate, a top plate guide, a top plate drive, a side plate, a side plate guide, and a side plate drive. The top plate is vertically slidably connected to the frame through the top plate guide. The top plate drive is used to drive the top plate to rise and fall. The bottom of the top plate is provided with the upper mold. Two side plates are symmetrically provided. Both side plates are longitudinally slidably connected to the frame through the side plate guide. The side plate drive is used to drive the side plates to move longitudinally. The two side plates are used to clamp the lower mold.

7. A low-pressure casting machine according to claim 5, characterized in that, The transport mechanism includes a transport vehicle, a transport guide, and a transport drive. The transport vehicle is used to carry the heat preservation furnace. The transport vehicle is laterally slidably connected to the bottom of the frame through the transport guide. The transport drive is used to drive the transport vehicle to move laterally.

8. A low-pressure casting machine according to claim 5, characterized in that, The heat preservation furnace is provided with lifting plates on both longitudinal sides. The lifting mechanism includes a lifting support frame, a lifting drive component, a lifting frame, and a lifting guide component. The lifting support frame is located at the bottom of the frame. The lifting drive component is provided on the lifting support frame. The lifting drive component is used to drive the lifting frame to lift. The lifting frame is used to lift the lifting plate. The lifting frame is vertically slidably connected to the lifting support frame through the lifting guide component.

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