Low-pressure casting equipment and using method thereof

Abstract

The invention discloses low-pressure casting equipment and a using method thereof, and relates to the field of low-pressure casting, the low-pressure casting equipment comprises a bottom plate and sliding rods symmetrically and fixedly connected to the top of the bottom plate, a top plate is fixedly connected to the tops of the sliding rods, a lifting plate is slidably connected to the surfaces of the two sliding rods, and a movable mechanism is mounted on one side of the lifting plate; and a material receiving mechanism is mounted on one side of the top of the movable mechanism. A driving motor is started, a rotating shaft is accurately controlled to rotate, a crank is driven to swing, the crank enables a rack to slide in a limiting frame, a gear is driven to rotate, then a movable sleeve is driven to rotate, the special design of the gear enables a limiting block to move along the track of a limiting hole, and a lifting rod is driven to ascend and descend firstly, then rotate by 180 degrees and ascend and descend again. The complex movement is achieved through cooperation of a limiting groove and a limiting rod, stability is ensured, a lifting rod drives a first swing rod and a second swing rod to move cooperatively, a sealing plate is matched with a liquid outlet, plugging is completed, and dust and impurities are prevented from entering the liquid outlet tank.

Description

Technical Field

[0001] The invention relates to the technical field of low-pressure casting, in particular to a low-pressure casting device and a use method thereof. Background Art

[0002] Low-pressure casting refers to a casting method in which the mold is generally placed above a sealed crucible, and compressed air is passed into the crucible to create a low pressure (0.06-0.15MPa) on the surface of the molten metal, causing the molten metal to rise from the riser to fill the mold and control solidification. This casting method has good shrinkage compensation, dense casting structure, and is easy to cast large, thin-walled, complex castings without the need for risers.

[0003] For example, the "a casting core box mold with a low-pressure pouring system" with publication number: CN118122994A comprises: a base plate; a core box, which consists of a left half mold and a right half mold, the core box is vertically placed on the base plate, the left half mold and the right half mold have the same structure, the opposite surfaces of the left half mold and the right half mold are provided with a recessed cavity, the opposite surfaces of the left half mold and the right half mold are fitted, and the cavities of the left half mold and the right half mold are combined to form a filling chamber, the side of the core box is provided with a flange opening, the flange opening is formed by the left half mold and the right half mold being combined, and the top of the core box is provided with a filling opening; a casting channel, which is arranged in the core box.

[0004] However, in the prior art, when low-pressure casting is performed, the raw material flows upward under the action of pressure and enters the mold for casting. However, after the casting is completed, when the raw material flows back to the container below, impurities are easily introduced into the connection between the mold and the container. Once these impurities enter the mold, they will mix with the molten metal raw material, resulting in inclusions or pores in the casting, thereby reducing the mechanical properties and surface quality of the casting. In addition, impurities mixed into the molten metal will also reduce the purity of the casting, which will have an adverse effect on its performance and reliability. Summary of the invention

[0005] The object of the present invention is to provide a low-pressure casting device and a method for using the same, so as to solve the problem that impurities are easily introduced into the connection between the mold and the container as mentioned in the background art.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: a low-pressure casting device, comprising a bottom plate and a sliding rod symmetrically fixedly connected to the top of the bottom plate, a top plate fixedly connected to the top of the sliding rod, and lifting plates slidably connected to the surfaces of the two sliding rods, a movable mechanism is installed on one side of the lifting plate, and a material receiving mechanism is installed on one side of the top of the movable mechanism; The movable mechanism comprises a mounting frame, a fixed block is fixedly connected to the top center of the mounting frame, the mounting frame is rotatably connected to a movable sleeve, the bottom of the movable sleeve is fixedly connected to a gear, the gear is not fixedly connected to a limiting frame, the bottom of the limiting frame is rotatably connected to the bottom of the inner cavity of the mounting frame, and the inner side of the limiting frame is slidably connected to a rack, one end of the rack is rotatably connected to a crank, the inner wall of one end of the crank is fixedly connected to a rotating shaft, the inner side of the movable sleeve is slidably connected to a lifting rod, the top of the lifting rod passes through the fixing block in sequence, and the lifting rod is slidably connected to the fixed block, a limiting hole is provided on one side of the movable sleeve, the bottom end of the lifting rod is fixedly connected to the limiting block, the limiting block is slidably connected to the limiting hole, a limiting groove is provided on the outer surface of the lifting rod, the limiting rod is fixedly connected to the inner side of the fixing block, and one end of the limiting rod is slidably connected to the limiting groove.

[0007] Preferably, a driving motor is installed on one side of the bottom of the mounting frame, the output end of the driving motor is fixedly connected to the rotating shaft, the rack is meshingly connected to the gear, the top of the lifting rod is fixedly connected to a first swing rod, and the top of the first swing rod is fixedly connected to a second swing rod.

[0008] Preferably, one end of the second swing arm is fixedly connected to a fixing plate, and one end of the first swing arm is fixedly connected to a sealing plate.

[0009] Preferably, the material receiving mechanism includes a support platform, three fixed rods are fixedly connected to the top of the support platform, the tops of the three fixed rods are fixedly connected to the material receiving platform, the top of the support platform is fixedly connected to a guide block, and a lifting block is installed in the center of the top of the support platform.

[0010] Preferably, the bottom of the support platform is fixedly connected to the fixed plate, a cylinder is installed at the bottom of the fixed plate, an output end of the cylinder passes through the support platform, and the top of the support platform is fixedly connected to the bottom of the lifting block.

[0011] Preferably, a driving block is fixedly connected to the bottom of the lifting block, and a driving rod is slidably connected inside the driving block.

[0012] Preferably, a movable rod is slidably connected inside the guide block, and the inner side of one end of the movable rod is fixedly connected to the driving rod.

[0013] Preferably, the surface of the receiving platform is provided with three guide holes, one end of the movable rod is fixedly connected with a clamping plate, the top end of the clamping plate is located on the surface of the receiving platform, and the clamping plate is slidably connected to the guide hole.

[0014] Preferably, an upper mold base is installed in the center of the bottom of the top plate, a lower mold base is installed in the center of the top of the lifting plate, and a liquid outlet tank is fixedly connected to the center of the bottom of the lifting plate. Two hydraulic cylinders are fixedly connected to the top of the bottom plate, and the top of the hydraulic cylinder is fixedly connected to the bottom of the lifting plate.

[0015] A method for using a low pressure casting device comprises the following steps: Step 1: Casting preparation and execution: Use a hydraulic cylinder to control the lifting and lowering of the lifting plate, so that the liquid outlet of the liquid outlet tank is connected with the inner cavity of the upper die base and the lower die base, reduce the pressure of the lower die base and the upper die base, and make the raw material in the liquid outlet tank flow into the inner cavity of the die base for casting; Step 2: Blocking after casting is completed. After casting is completed, the movement of the lifting rod controls the bottom of the sealing plate to match the liquid outlet through the first swing rod and the second swing rod to complete the blocking. The sealing plate blocks the liquid outlet in time. Step 3: The fixed plate controls the material receiving mechanism to receive the material. The cylinder controls the lifting block to move up and down. Through the linkage of the driving block, driving rod and movable rod, the three clamping plates move at the same time to clamp and position the finished product. Step 4: Reset. The fixed plate and sealing plate are reset under the continued rotation of the drive motor to prepare for the next round of casting. Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, the rotation of the rotating shaft is accurately controlled by starting the driving motor, driving the crank to swing, and the crank makes the rack slide in the limit frame, driving the gear to rotate, and then driving the movable sleeve to rotate. The special design of the gear makes the limit block move along the trajectory of the limit hole, driving the lifting rod to first lift, then rotate 180 degrees, and then lift. This complex movement is achieved by the limit groove and the limit rod to ensure stability. The lifting rod drives the first swing rod and the second swing rod to move in coordination, so that the sealing plate matches the liquid outlet, completes the plugging, and prevents dust and impurities from entering the liquid outlet tank.

[0016] 2. In the present invention, after the cylinder is started, it pushes the lifting block to lift vertically, driving the driving block to move. The driving block applies force to the driving rod to drive the movable rod to move. The guide block ensures that the movable rod moves in a straight line to improve accuracy. The movement of the movable rod drives the three clamps to move synchronously toward the finished product to improve clamping efficiency. The guide holes accurately limit the moving trajectory of the clamps to prevent skewing or deviation, ensuring stable clamping of the finished product. At the same time, the three material receiving tables also maintain stable movement, improving the reliability and accuracy of the entire material receiving mechanism. The entire mechanism is exquisitely designed to ensure the smooth clamping and transportation of the finished casting.

[0017] 3. In the present invention, during the casting operation, the hydraulic cylinder accurately controls the lifting and lowering of the lifting plate to ensure that the liquid outlet is connected to the inner cavity of the mold base, reducing the pressure to allow the raw material to flow in for casting. After the casting is completed, the sealing plate accurately blocks the liquid outlet to prevent leakage and impurities from entering. The fixed plate and the material receiving mechanism work together to accurately adjust the position to receive the finished product, thereby improving production efficiency. As the drive motor rotates, the fixed plate and the sealing plate are reset to prepare for the next round of casting, making it easy to quickly remove the finished product and achieve continuous and efficient casting operations. During the entire process, the various components work together to ensure the smooth progress of the casting operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of a low-pressure casting device of the present invention; Figure 2 It is a front view structural schematic diagram of a low pressure casting device of the present invention; Figure 3 It is a structural schematic diagram of a movable mechanism of a low-pressure casting equipment of the present invention; Figure 4 It is a cross-sectional structural schematic diagram of a movable mechanism of a low-pressure casting device of the present invention; Figure 5 It is a schematic diagram of the disassembled structure of the movable mechanism of a low-pressure casting equipment of the present invention; Figure 6 It is a schematic diagram of a partially disassembled structure of a movable mechanism of a low-pressure casting device of the present invention; Figure 7 It is a structural schematic diagram of a material receiving mechanism of a low-pressure casting equipment of the present invention; Figure 8 The present invention is a schematic diagram of the disassembled structure of a material receiving mechanism of a low-pressure casting device.

[0019] In the figure: 1, bottom plate; 11, hydraulic cylinder; 12, slide bar; 2, lifting plate; 21, lower die seat; 22, liquid outlet tank; 3, top plate; 31, upper die seat; 4, movable mechanism; 41, mounting frame; 411, fixing block; 412, limiting rod; 42, driving motor; 43, movable sleeve; 431, limiting hole; 432, gear; 433, limiting frame; 44, rotating shaft; 441, crank; 45, rack; 4 6. Lifting rod; 461. Limiting groove; 462. Limiting block; 47. First swing rod; 471. Sealing plate; 48. Second swing rod; 481. Fixed plate; 5. Material receiving mechanism; 51. Cylinder; 511. Fixed rod; 512. Guide block; 52. Support table; 53. Lifting block; 531. Drive block; 54. Movable rod; 541. Drive rod; 55. Clamp; 56. Material receiving table; 561. Guide hole. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Example 1: Reference Figure 1 - Figure 6 As shown: a low-pressure casting device, comprising a bottom plate 1 and a sliding rod 12 symmetrically fixedly connected to the top thereof, a top plate 3 fixedly connected to the top of the sliding rod 12, and a lifting plate 2 slidably connected to the surfaces of the two sliding rods 12, a movable mechanism 4 is installed on one side of the lifting plate 2, and a material receiving mechanism 5 is installed on one side of the top of the movable mechanism 4; The movable mechanism 4 includes a mounting frame 41, a fixed block 411 is fixedly connected to the center of the top of the mounting frame 41, a movable sleeve 43 is rotatably connected to the inner side of the mounting frame 41, a gear 432 is fixedly connected to the bottom of the movable sleeve 43, the gear 432 is loosely connected to a limiting frame 433, the bottom of the limiting frame 433 is rotatably connected to the bottom of the inner cavity of the mounting frame 41, and a rack 45 is slidably connected to the inner side of the limiting frame 433, one end of the rack 45 is rotatably connected to a crank 441, and the inner wall of one end of the crank 441 is fixedly connected to a rotating shaft 44 A lifting rod 46 is slidably connected to the inner side of the movable sleeve 43, and the top of the lifting rod 46 passes through the fixed block 411 in sequence, and the lifting rod 46 is slidably connected to the fixed block 411. A limiting hole 431 is provided on one side of the movable sleeve 43, and the bottom end of the lifting rod 46 is fixedly connected to the limiting block 462, and the limiting block 462 is slidably connected to the limiting hole 431. A limiting groove 461 is provided on the outer surface of the lifting rod 46, and the limiting rod 412 is fixedly connected to the inner side of the fixed block 411, and one end of the limiting rod 412 is slidably connected to the limiting groove 461.

[0022] In this embodiment, at the final stage of the casting process, the lifting plate 2 moves downward according to a preset program to prepare for the next step of packaging. At this time, the driving motor 42 is started, which accurately controls the rotation of the rotating shaft 44. As the rotating shaft 44 rotates, the crank 441 connected thereto also begins to swing accurately around the rotating shaft 44.

[0023] Each swing of the crank 441 drives the rack 45 to slide stably inside the limit frame 433. In this process, the meshing relationship between the rack 45 and the gear 432 plays a key role. The force applied by the rack 45 to the gear 432 causes the gear 432 to start rotating, thereby driving the movable sleeve 43 to rotate together.

[0024] At the same time, the rotation of the gear 432 not only causes its own rotation, but also generates a specific force on the limit block 462 through its special tooth design. This force enables the limit block 462 to move stably along the track defined by the limit hole 431. In this process, the lifting rod 46 starts a complex motion track due to the combined action of the gear 432 and the limit block 462.

[0025] The movement process of the lifting rod 46 is cleverly designed to first lift, then rotate 180 degrees, and then lift again. This movement mode is achieved through the precise cooperation of the limit slot 461 and the limit rod 412. The limit slot 461 provides a clear path for the movement of the lifting rod 46, while the limit rod 412 ensures the stability and accuracy of the lifting rod 46 during the movement.

[0026] With the precise movement of the lifting rod 46, the first swing rod 47 and the second swing rod 48 connected thereto also begin to move in coordination. This movement ultimately enables the sealing plate 471 to accurately match the liquid outlet of the liquid outlet tank 22, thereby completing the work of blocking the liquid outlet. Throughout the entire process, the coordinated work between the various components ensures the accuracy and efficiency of the operation, providing a strong guarantee for the smooth completion of the casting process.

[0027] Embodiment 2: Figure 7 and Figure 8 As shown, the material receiving mechanism 5 includes a support platform 52, three fixed rods 511 are fixedly connected to the top of the support platform 52, a material receiving platform 56 is fixedly connected to the top of the three fixed rods 511, a guide block 512 is fixedly connected to the top of the support platform 52, and a lifting block 53 is installed at the center of the top of the support platform 52. The bottom of the support platform 52 is fixedly connected to the fixed plate 481, a cylinder 51 is installed at the bottom of the fixed plate 481, the output end of the cylinder 51 passes through the support platform 52, and the top of the support platform 52 is fixedly connected to the bottom of the lifting block 53. A driving block 531 is fixedly connected to the bottom of the lifting block 53, and a driving rod 541 is slidably connected inside the driving block 531. A movable rod 54 is slidably connected inside the guide block 512, and the inner side of one end of the movable rod 54 is fixedly connected to the driving rod 541. There are three guide holes 561 on the surface of the material receiving platform 56 , and a clamping plate 55 is fixedly connected to one end of the movable rod 54 . The top end of the clamping plate 55 is located on the surface of the material receiving platform 56 , and the clamping plate 55 is slidably connected to the guide hole 561 .

[0028] In this embodiment, first, after the cylinder 51 is started, it will push the lifting block 53 to perform vertical lifting movement. The lifting block 53 not only moves up and down itself, but also drives the driving block 531 connected thereto to move together. During the movement of the driving block 531, a force is applied to the driving rod 541. This force causes the driving rod 541 to move, and then drives the movement of the movable rod 54.

[0029] The movement of the movable rod 54 is not random. The guide block 512 limits the movement range and direction of the movable rod 54, ensuring the accuracy and stability of the movement.

[0030] As the movable rod 54 moves, the clamping plates 55 connected thereto also start to move. These clamping plates 55 are grouped in three and move to the position of the finished product at the same time. This design not only improves the clamping efficiency, but also ensures the stability and safety of the finished product during the clamping process.

[0031] In order to ensure that there is no skewing or deviation during the clamping process, the design of the guide holes 561 plays a key role. These guide holes 561 accurately limit the movement trajectory of the clamping plate 55, ensuring that it always remains in the correct position during the movement. At the same time, the three receiving tables 56 also maintain stable movement through this design.

[0032] Embodiment 3: According to Figure 1-6 As shown, a driving motor 42 is installed at one side of the bottom of the mounting frame 41, the output end of the driving motor 42 is fixedly connected to the rotating shaft 44, the rack 45 is meshed with the gear 432, the top of the lifting rod 46 is fixedly connected to the first swing rod 47, and the top of the first swing rod 47 is fixedly connected to the second swing rod 48. One end of the second swing rod 48 is fixedly connected to a fixed plate 481, and one end of the first swing rod 47 is fixedly connected to a sealing plate 471. An upper die seat 31 is installed at the center of the bottom of the top plate 3, a lower die seat 21 is installed at the center of the top of the lifting plate 2, and a liquid outlet tank 22 is fixedly connected to the center of the bottom of the lifting plate 2, and two hydraulic cylinders 11 are fixedly connected to the top of the bottom plate 1, and the top of the hydraulic cylinder 11 is fixedly connected to the bottom of the lifting plate 2.

[0033] In this embodiment, the hydraulic cylinder 11 plays a vital role in the casting operation. By accurately controlling the extension and contraction of the hydraulic cylinder 11, the lifting height of the lifting plate 2 can be accurately adjusted. When the lifting plate 2 moves upward, it ensures that the liquid outlet at the top of the liquid outlet tank 22 is fully connected with the inner cavity formed by the upper die seat 31 and the lower die seat 21. This action reduces the pressure inside the lower die seat 21 and the upper die seat 31, thereby allowing the casting raw material inside the liquid outlet tank 22 to flow smoothly into the inner cavity of the lower die seat 21 and the upper die seat 31 under the action of the internal and external pressure difference, and carry out the subsequent casting process.

[0034] After casting is completed, the role of the sealing plate 471 becomes particularly critical. It moves precisely to the liquid outlet position of the liquid outlet tank 22 to ensure that the liquid outlet is completely blocked. This step not only effectively avoids the leakage of casting raw materials, but also prevents external impurities from entering the casting system, ensuring the quality and purity of the casting product.

[0035] At the same time, the cooperation between the fixed plate 481 and the material receiving mechanism 5 also brings convenience to the casting process. When the casting is completed, the fixed plate 481 will drive the material receiving mechanism 5 to make precise position adjustments to ensure that the material receiving mechanism 5 can accurately receive the finished product after casting. This step not only improves production efficiency, but also reduces the tediousness of manual operation.

[0036] As the driving motor 42 continues to rotate, the fixing plate 481 and the sealing plate 471 will be reset. This step is ready for the next round of casting operation, and it is also convenient for the staff to quickly take away the finished product after casting, so as to achieve the continuity and efficiency of the casting operation.

[0037] Embodiment 4: A method for using a low-pressure casting device, comprising the following steps: 1) Casting preparation and execution: Use the hydraulic cylinder 11 to control the lifting and lowering of the lifting plate 2, so that the liquid outlet of the liquid outlet tank 22 is connected with the inner cavity of the upper die base 31 and the lower die base 21, reduce the pressure of the lower die base 21 and the upper die base 31, and make the raw material in the liquid outlet tank 22 flow into the inner cavity of the die base for casting; 2) Blocking after casting is completed. After casting is completed, the movement of the lifting rod 46 controls the bottom of the sealing plate 471 to match the liquid outlet through the first swing rod 47 and the second swing rod 48 to complete the blocking. The sealing plate 471 blocks the liquid outlet in time; 3) The fixed plate 481 controls the material receiving mechanism 5 to receive the material. The cylinder 51 controls the lifting block 53 to rise and fall. Through the linkage of the driving block 531, the driving rod 541 and the movable rod 54, the three clamping plates 55 move simultaneously to clamp and position the finished product; 4) Reset: the fixing plate 481 and the sealing plate 471 are reset under the continued rotation of the driving motor 42 to prepare for the next round of casting.

[0038] The use method and working principle of the device: When performing casting operations, the hydraulic cylinder 11 is used to control the lifting and lowering of the lifting plate 2, so that the liquid outlet at the top of the liquid outlet tank 22 is connected to the inner cavity composed of the upper die seat 31 and the lower die seat 21, thereby reducing the pressure of the lower die seat 21 and the upper die seat 31. Under the action of this pressure difference, the raw material in the liquid outlet tank 22 will smoothly flow into the inner cavity of the lower die seat 21 and the upper die seat 31 to perform the casting operation. After the casting is completed, the sealing plate 471 will promptly block the liquid outlet to prevent leakage and impurities from entering.

[0039] After the casting is completed, the lifting plate 2 moves downward. At this time, the driving motor 42 is started, driving the rotating shaft 44 to rotate. The rotation of the rotating shaft 44 will cause the crank 441 to move and rotate around the center of the rotating shaft 44. The movement of the crank 441 will further push the rack 45 to slide inside the limiting frame 433. The rack 45 applies a force to the gear 432 to rotate the gear 432. The rotation of the gear 432 will drive the movable sleeve 43 to rotate together. During the rotation process, the force applied by the gear 432 to the limit block 462 causes the limit block 462 to move along the trajectory of the limit hole 431, thereby causing the lifting rod 46 to rotate and complete a 180-degree rotation. At the same time, due to the movement of the gear 432, the lifting rod 46 will also perform a lifting movement.

[0040] During the movement of the lifting rod 46, due to the synergistic effect of the limiting groove 461 and the limiting rod 412, the lifting rod 46 will first be lifted, then rotated 180 degrees, and then be lifted again, and this process will be repeated. The movement of the lifting rod 46 will further control the movement of the first swing rod 47 and the second swing rod 48. When the lifting rod 46 moves downward, it will push the bottom of the sealing plate 471 to match the liquid outlet of the liquid outlet tank 22, thereby completing the blocking action.

[0041] In addition, the fixed plate 481 can control the material receiving mechanism 5 to receive the material. When the drive motor 42 continues to rotate, it will control the fixed plate 481 and the sealing plate 471 to reset so as to carry out the next round of casting operations and quickly take away the finished product. During the material receiving process, the cylinder 51 controls the lifting block 53 to perform lifting and lowering movements. When the lifting block 53 moves upward, it will drive the driving block 531 to move together. During the movement, the driving block 531 will apply a force to the driving rod 541, so that the driving rod 541 drives the movable rod 54 to move in a straight line (due to the limitation of the guide block 512). The movement of the movable rod 54 will cause the three clamps 55 to move at the same time, clamping and positioning the finished product. During the clamping process, the guide hole 561 ensures that the clamp 55 moves along a predetermined trajectory, avoiding the three material receiving platforms 56 from being skewed or offset during movement.

[0042] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-pressure casting device, comprising a bottom plate (1) and a sliding rod (12) symmetrically fixedly connected to the top thereof, wherein the top of the sliding rod (12) is fixedly connected to a top plate (3), and two surfaces of the sliding rods (12) are slidably connected to lifting plates (2), characterized in that: A movable mechanism (4) is installed on one side of the lifting plate (2), and a material receiving mechanism (5) is installed on one side of the top of the movable mechanism (4); The movable mechanism (4) comprises a mounting frame (41), a fixed block (411) is fixedly connected to the center of the top of the mounting frame (41), a movable sleeve (43) is rotatably connected to the inside of the mounting frame (41), a gear (432) is fixedly connected to the bottom of the movable sleeve (43), the gear (432) is loosely connected to a limiting frame (433), the bottom of the limiting frame (433) is rotatably connected to the bottom of the inner cavity of the mounting frame (41), and a rack (45) is slidably connected to the inside of the limiting frame (433), one end of the rack (45) is rotatably connected to a crank (441), and one end of the crank (441) is fixedly connected to the inner wall of a rotating shaft (44). A lifting rod (46) is slidably connected to the inner side of the movable sleeve (43); the top of the lifting rod (46) passes through the fixed block (411) in sequence, and the lifting rod (46) is slidably connected to the fixed block (411); a limiting hole (431) is provided on one side of the movable sleeve (43); the bottom end of the lifting rod (46) is fixedly connected to the limiting block (462); the limiting block (462) is slidably connected to the limiting hole (431); a limiting groove (461) is provided on the outer surface of the lifting rod (46); the limiting rod (412) is fixedly connected to the inner side of the fixed block (411); one end of the limiting rod (412) is slidably connected to the limiting groove (461).

2. A low pressure casting device according to claim 1, characterized in that: A driving motor (42) is mounted on one side of the bottom of the mounting frame (41); an output end of the driving motor (42) is fixedly connected to a rotating shaft (44); the rack (45) is meshingly connected to a gear (432); a first swinging rod (47) is fixedly connected to the top of the lifting rod (46); and a second swinging rod (48) is fixedly connected to the top of the first swinging rod (47).

3. A low pressure casting device according to claim 2, characterized in that: One end of the second swing rod (48) is fixedly connected to a fixing plate (481), and one end of the first swing rod (47) is fixedly connected to a sealing plate (471).

4. A low pressure casting device according to claim 1, characterized in that: The material receiving mechanism (5) comprises a support platform (52), three fixed rods (511) are fixedly connected to the top of the support platform (52), the tops of the three fixed rods (511) are fixedly connected to the material receiving platform (56), the top of the support platform (52) is fixedly connected to a guide block (512), and a lifting block (53) is installed in the center of the top of the support platform (52).

5. A low pressure casting device according to claim 4, characterized in that: The bottom of the support platform (52) is fixedly connected to the fixing plate (481), a cylinder (51) is installed at the bottom of the fixing plate (481), an output end of the cylinder (51) passes through the support platform (52), and the top of the support platform (52) is fixedly connected to the bottom of the lifting block (53).

6. A low pressure casting device according to claim 5, characterized in that: The bottom of the lifting block (53) is fixedly connected to a driving block (531), and the interior of the driving block (531) is slidably connected to a driving rod (541).

7. A low pressure casting device according to claim 6, characterized in that: A movable rod (54) is slidably connected inside the guide block (512), and the inner side of one end of the movable rod (54) is fixedly connected to the driving rod (541).

8. A low pressure casting device according to claim 7, characterized in that: The surface of the receiving platform (56) is provided with three guide holes (561); one end of the movable rod (54) is fixedly connected to a clamping plate (55); the top end of the clamping plate (55) is located on the surface of the receiving platform (56), and the clamping plate (55) is slidably connected to the guide hole (561).

9. A low pressure casting device according to claim 1, characterized in that: An upper die seat (31) is installed at the center of the bottom of the top plate (3), a lower die seat (21) is installed at the center of the top of the lifting plate (2), and a liquid outlet tank (22) is fixedly connected to the center of the bottom of the lifting plate (2). Two hydraulic cylinders (11) are fixedly connected to the top of the bottom plate (1), and the top of the hydraulic cylinder (11) is fixedly connected to the bottom of the lifting plate (2).

10. A method for using a low pressure casting device, characterized in that: A low pressure casting device according to any one of claims 1 to 9 is used, comprising the following steps: S1, preparing and carrying out casting, using a hydraulic cylinder (11) to control the lifting and lowering of the lifting plate (2), so that the liquid outlet of the liquid outlet tank (22) is connected with the inner cavity of the upper die base (31) and the lower die base (21), reducing the pressure of the lower die base (21) and the upper die base (31), so that the raw material in the liquid outlet tank (22) flows into the inner cavity of the die base for casting; S2, sealing after casting is completed. After casting is completed, the movement of the lifting rod (46) controls the bottom of the sealing plate (471) to match the liquid outlet through the first swing rod (47) and the second swing rod (48), thereby completing the sealing. The sealing plate (471) seals the liquid outlet in time; S3, receiving the material and clamping the finished product, the fixed plate (481) controls the material receiving mechanism (5) to receive the material, the cylinder (51) controls the lifting block (53) to rise and fall, and through the linkage of the driving block (531), the driving rod (541) and the movable rod (54), the three clamping plates (55) move simultaneously to clamp and position the finished product; S4, resetting, the fixing plate (481) and the sealing plate (471) are reset under the continued rotation of the driving motor (42), and are ready for the next round of casting.

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