A split top mold structure

Abstract

The present invention relates to the technical field of wheel hub casting molds, and discloses a split top mold structure, including a top mold, a negative pressure chamber, a temperature rise ejection component, and an exhaust self-compensation component. The present invention uses a mechanically linked automatic compensation mechanism to accurately fill the actual gap after the bubble overflows, thereby realizing closed-loop control of the casting, effectively ensuring uniform density of the casting, and ensuring product dimensional accuracy and stable internal quality; using the residual heat of the aluminum liquid to heat the distilled water to generate steam to push the components to discharge excess aluminum liquid, without the need for additional energy, while achieving negative pressure self-circulation, without the need for external exhaust equipment, significantly reducing equipment purchase, operation and maintenance costs, and conforming to the concept of green manufacturing; relying on the collaborative operation of the cooling pipe and the negative pressure chamber based on the ideal gas state equation, a stable negative pressure cycle is achieved, ensuring that the negative pressure chamber is in an ideal negative pressure state before each casting, thereby improving the stability of the casting process.

Description

Technical Field

[0001] The invention belongs to the technical field of wheel hub casting molds, and in particular relates to a split top mold structure. Background Art

[0002] In the field of aluminum alloy wheel casting, the split mold structure is widely used due to its easy disassembly and maintenance. The top mold and the bottom mold form a complete casting space.

[0003] However, existing split top molds still face numerous technical challenges in practical use. Most traditional split top molds simply exhaust air from the mold cavity by creating exhaust channels. This is ineffective in removing bubbles from the molten aluminum, making it difficult to effectively prevent casting defects such as porosity and shrinkage. This leads to uneven quality within the casting, seriously affecting the mechanical properties and service life of the aluminum alloy wheel. Furthermore, some split top molds rely on external vacuum equipment to achieve negative pressure exhaust, which not only increases the complexity and purchase cost of the equipment, but also requires separate exhaust for each use, which is complex and hinders efficiency.

[0004] In view of this, the present invention is proposed. Summary of the Invention

[0005] In order to solve the technical problems that most traditional split top molds simply open exhaust channels to exhaust the air in the mold cavity, which is not effective in exhausting bubbles inside the aluminum liquid, making it difficult to effectively avoid casting defects such as pores and shrinkage, resulting in uneven quality of the internal casting, seriously affecting the mechanical properties and service life of the aluminum alloy wheel hub; and some split top molds rely on external exhaust equipment to achieve negative pressure exhaust, which not only increases the complexity and purchase cost of the equipment, but also requires separate exhaust each time it is used, which is complicated to operate and is not conducive to improving efficiency, the basic concept of the technical solution adopted by the present invention is:

[0006] A split top mold structure comprises a top mold.

[0007] The top mold is provided with a negative pressure cavity for absorbing bubbles and filled with distilled water, and the negative pressure cavity is covered with a cover plate;

[0008] The cover plate is provided with a connecting pipe connected to the bottom of the top mold, and a temperature-raising ejection assembly is provided on the connecting pipe. The temperature-raising ejection assembly includes a piston inserted in the negative pressure chamber and a diverter inserted in the inner cavity of the connecting pipe.

[0009] After the pressure in the negative pressure chamber increases, the piston slides until it moves to the pressure relief hole connected to the negative pressure chamber, and drives the diverter to push out the excess aluminum liquid in the connecting pipe. After the temperature of the negative pressure chamber recovers, the steam is cooled to generate a negative pressure state inside.

[0010] An air extraction self-compensating component is installed inside the negative pressure chamber, and the air extraction self-compensating component includes a turntable for sealing the negative pressure port inside the negative pressure chamber, and a notch is provided on the turntable for opening the negative pressure port. A guide block is installed at the bottom of the turntable for squeezing excess aluminum liquid into the mold cavity, thereby compensating for the holes caused by bubble overflow.

[0011] As a preferred embodiment of the present invention, four positioning grooves are provided at the bottom corners of the top mold, positioning rods are installed inside the four positioning grooves, and the positioning rods are in a vertical state, the positioning rods and the bottom mold adapted to the top mold are plugged into each other, the side wall of the top mold is provided with a mounting hole, and the bottom of the mounting hole is provided with a mounting groove that is interconnected with the bottom mold, and the mounting groove is used to connect bolts.

[0012] As a preferred embodiment of the present invention, a mold core is provided at the bottom of the top mold, a countersunk groove is opened on the negative pressure cavity, the cover plate is installed on the countersunk groove, and the sizes of the two are adapted, and a cooling pipe connected to the bottom mold is installed inside the top mold, and the cooling pipe runs through the internal chamber of the negative pressure cavity.

[0013] As a preferred embodiment of the present invention, a positioning sleeve connected to the negative pressure chamber is installed on the cover plate, a sliding cavity is opened inside the positioning sleeve, and the end of the sliding cavity is connected to the installation cavity, a pressure relief hole for pressure relief is opened on the side wall of the sliding cavity, and the bottom of the sliding cavity is movably connected to the piston.

[0014] As a preferred embodiment of the present invention, a sliding rod is installed on the piston, and the sliding rod movably passes through the positioning sleeve. A limiting plate is installed on the side wall of the sliding rod, and the limiting plate is overlapped above the positioning sleeve. A return spring is provided on the side wall of the sliding rod, and one end of the return spring is clamped on the inner side wall of the mounting cavity, and the other end of the return spring is clamped on the upper surface of the piston.

[0015] As a preferred embodiment of the present invention, a connecting plate is installed on the top of the sliding rod, the connecting plate is placed above the connecting pipe, and a guide cover is installed on the bottom of the connecting plate. The guide cover is conical, and the bottom is inserted into the bottom of the connecting pipe. Two vertical poles are connected to the bottom of the guide cover, the two vertical poles are parallel to each other, and the bottom of the vertical poles are connected to the surface of the diversion table.

[0016] As a preferred embodiment of the present invention, a conical arc surface is provided at the bottom of the connecting pipe, the surface of the diverter table is inclined, and the connecting pipe and the diverter table are adapted to each other, an inner groove is provided on the cover plate, and the inner groove is annular. A collecting cover is installed on the inner groove by bolts, and the collecting cover is sleeved on the outside of the connecting pipe, and the top of the connecting pipe and the top of the collecting cover are on the same plane, and the outer edge of the top of the collecting cover is chamfered.

[0017] As a preferred embodiment of the present invention, a rotating shaft is installed on the turntable, and the rotating shaft movably passes through the cover plate. A knob is installed at the end of the rotating shaft, and an adapting protrusion is installed on the knob. A torsion spring is sleeved on the rotating shaft, and one end of the torsion spring is clamped to the bottom of the cover plate, and the other end is clamped to the turntable.

[0018] As a preferred embodiment of the present invention, a negative pressure tube is connected to the bottom of the negative pressure chamber, and the surface of the turntable is attached to the negative pressure port of the negative pressure tube, and the size of the gap is larger than the size of the negative pressure tube.

[0019] As a preferred embodiment of the present invention, a compensation cover is installed at the bottom of the negative pressure chamber, a push plate is sliding inside the compensation cover, and a push rod is installed on the push plate. The push rod moves through the compensation cover, and a rolling ball is installed at the end of the push rod. The rolling ball is slidably connected to the slope opened on the surface of the guide block.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The present invention uses a mechanically linked automatic compensation mechanism to accurately fill the actual gaps after the bubbles overflow, realize closed-loop control of the casting, effectively ensure the uniform density of the casting, and ensure the dimensional accuracy and internal quality stability of the product; use the waste heat of the aluminum liquid to heat the distilled water to generate steam to drive the components to discharge excess aluminum liquid, without the need for additional energy, and at the same time realize negative pressure self-circulation, without the need for external exhaust equipment, significantly reducing the equipment purchase, operation and maintenance costs, and conforming to the concept of green manufacturing; relying on the coordinated operation of the cooling pipe and the negative pressure chamber based on the ideal gas state equation, a stable negative pressure circulation is achieved, ensuring that the negative pressure chamber is in an ideal negative pressure state before each casting, thereby improving the stability of the casting process.

[0022] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In the attached figure:

[0024] Figure 1 It is a bottom view of a split top mold structure;

[0025] Figure 2 It is a three-dimensional diagram of a split top mold structure;

[0026] Figure 3 It is a cross-sectional view of a split top mold structure;

[0027] Figure 4 for Figure 3 Enlarged view of point A in the middle;

[0028] Figure 5 This is a diagram of the turntable connection structure of a split top mold structure;

[0029] Figure 6 for Figure 3 Enlarged view of point B in the middle;

[0030] Figure 7 for Figure 3 Front view of

[0031] Figure 8 This is a schematic diagram of the internal structure of a negative pressure chamber with a split top mold structure.

[0032] In the picture:

[0033] 1. Top mold; 11. Positioning rod; 111. Positioning groove; 12. Mold core; 13. Mounting hole; 131. Mounting groove; 14. Negative pressure chamber; 141. Countersunk groove; 15. Cooling pipe;

[0034] 2. Cover plate; 21. Connecting pipe; 211. Conical arc surface; 212. Collecting cover; 213. Inner groove; 22. Positioning sleeve; 221. Sliding cavity; 222. Mounting cavity; 223. Pressure relief hole; 23. Piston; 231. Sliding rod; 232. Return spring; 233. Limiting plate; 24. Diverter platform; 241. Vertical rod; 242. Guide cover; 244. Connecting plate;

[0035] 3. Turntable; 31. Rotating shaft; 311. Knob; 312. Torsion spring; 32. Notch; 321. Negative pressure tube; 33. Guide block; 331. Push rod; 332. Ball; 333. Push plate; 334. Ramp; 335. Compensating cover. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention.

[0037] Example 1, as Figures 1 to 8 As shown, a split top mold structure includes a top mold 1.

[0038] The top mold 1 is provided with a negative pressure chamber 14 for absorbing bubbles and filled with distilled water, and the negative pressure chamber 14 is covered with a cover plate 2; a connecting pipe 21 connected to the bottom of the top mold 1 is installed on the cover plate 2, and a temperature-raising ejection assembly is installed on the connecting pipe 21. The temperature-raising ejection assembly includes a piston 23 inserted in the negative pressure chamber 14 and a diverter 24 inserted in the inner cavity of the connecting pipe 21; the piston 23 slides after the pressure in the negative pressure chamber 14 increases until it moves to the pressure relief hole connected to the negative pressure chamber 14 223, and drives the diversion platform 24 to push out the excess aluminum liquid in the connecting pipe 21, and after the temperature of the negative pressure chamber 14 is restored, the steam is cooled to generate a negative pressure state inside; the negative pressure chamber 14 is installed with a vacuum self-compensating component, which includes a turntable 3 for sealing the negative pressure port inside the negative pressure chamber, and a notch 32 is provided on the turntable 3 for opening the negative pressure port. A guide block 33 is installed at the bottom of the turntable 3 for squeezing excess aluminum liquid into the mold cavity, thereby compensating for the holes caused by bubble overflow. Compared with the traditional top mold structure, this solution actively absorbs bubbles through the negative pressure chamber 14, avoiding defects such as porosity and looseness in the casting caused by residual bubbles, and significantly improving the mechanical properties and surface quality of the casting. At the same time, the negative pressure adsorption method does not require additional vacuum equipment and vacuuming processes, effectively reducing equipment investment costs and production cycles, increasing output per unit time, and enhancing the company's competitiveness in the market.

[0039] like Figures 1 to 8 As shown, in a specific embodiment, four positioning grooves 111 are provided at the bottom corners of the top mold 1. Positioning rods 11 are installed inside the four positioning grooves 111, and the positioning rods 11 are in a vertical position. The positioning rods 11 are plugged into the bottom mold that matches the top mold 1. The side wall of the top mold 1 is provided with a mounting hole 13. The bottom of the mounting hole 13 is provided with a mounting groove 131 that is interconnected with the bottom mold, and the mounting groove 131 is used to connect bolts. The coordinated design of the positioning grooves 111 and the positioning rods 11 can ensure the rapid and accurate positioning of the top mold 1 and the bottom mold, avoid problems such as aluminum liquid leakage and casting dimensional deviation caused by installation errors, and improve assembly efficiency and product qualification rate. The bolt connection method ensures the firmness of the connection between the top mold and the bottom mold, which can withstand the high temperature and pressure changes during the casting process.

[0040] like Figures 1 to 8As shown, further, a mold core 12 is provided at the bottom of the top mold 1, a countersunk groove 141 is provided on the negative pressure chamber 14, and the cover plate 2 is installed on the countersunk groove 141, and the sizes of the two are adapted. A cooling pipe 15 is installed inside the top mold 1 and is interconnected with the bottom mold. The cooling pipe 15 runs through the internal chamber of the negative pressure chamber 14. The arrangement of the mold core 12 can be replaced according to different casting requirements, which enhances the versatility of the top mold structure; the adaptive installation of the countersunk groove 141 and the cover plate 2 can effectively prevent the leakage of distilled water and ensure the functional stability of the negative pressure chamber 14; the cooling pipe 15 runs through the negative pressure chamber 14, which can not only quickly cool the aluminum liquid and shorten the casting molding time, but also cool the negative pressure chamber and realize the stable operation of the negative pressure self-circulation.

[0041] Example 2, based on Example 1, is different from this example in that: Figures 1 to 8 As shown, a positioning sleeve 22 is mounted on the cover plate 2 and communicates with the negative pressure chamber 14. A sliding cavity 221 is defined within the positioning sleeve 22, and the distal end of the sliding cavity 221 communicates with the mounting cavity 222. A pressure relief hole 223 is defined on the sidewall of the sliding cavity 221 for pressure relief. The bottom of the sliding cavity 221 is movably connected to the piston 23. The design of the positioning sleeve 22 provides a stable sliding track for the piston 23, ensuring precise movement of the piston 23 during pressure changes, thereby improving the controllability and accuracy of the discharge of excess aluminum liquid.

[0042] like Figures 1 to 8 As shown, in a specific embodiment, a slide rod 231 is mounted on the piston 23. The slide rod 231 movably extends through the positioning sleeve 22. A limit plate 233 is mounted on the side wall of the slide rod 231. The limit plate 233 overlaps the top of the positioning sleeve 22. A return spring 232 is sleeved on the side wall of the slide rod 231. One end of the return spring 232 is clamped to the inner wall of the mounting cavity 222, and the other end of the return spring 232 is clamped to the upper surface of the piston 23. The limit plate 233 prevents the piston 23 from disengaging from the positioning sleeve 22, ensuring the integrity and reliability of the device structure. The return spring 232 automatically pushes the piston 23 back to its original position after the pressure in the negative pressure chamber 14 drops, achieving automatic circulation of the device, reducing manual intervention, and improving production efficiency and stability.

[0043] like Figures 1 to 8As shown, further, a connecting plate 244 is installed on the top of the sliding rod 231, and the connecting plate 244 is placed above the connecting pipe 21. A guide cover 242 is installed at the bottom of the connecting plate 244. The guide cover 242 is conical, and the bottom is inserted into the bottom of the connecting pipe 21. Two vertical rods 241 are connected to the bottom of the guide cover 242. The two vertical rods 241 are parallel to each other, and the bottoms of the vertical rods 241 are connected to the surface of the diverter 24. A conical arc surface 211 is opened at the bottom of the connecting pipe 21, and the surface of the diverter 24 is in an inclined state. The connecting pipe 21 and the diverter 24 are adapted to each other. An inner groove 213 is opened on the cover plate 2. The inner groove 213 is annular. A collection cover 212 is installed on the inner groove 213 by bolts. The collection cover 212 is sleeved on the outside of the connecting pipe 21, and the top of the connecting pipe 21 and the top of the collection cover 212 are on the same plane. The outer edge of the top of the collection cover 212 is chamfered. The cooperation between the guide cover 242 and the conical arc surface 211 can effectively guide the discharge of excess aluminum liquid, avoid splashing of aluminum liquid, ensure a clean working environment and the safety of operators; the collection cover 212 can collect the discharged aluminum liquid for easy recycling and reuse, reduce the waste of raw materials, and comply with the concept of green production.

[0044] Example 3, based on Example 2 and different from this example: Figures 1 to 8 As shown, a rotating shaft 31 is mounted on the turntable 3, which movably extends through the cover plate 2. A knob 311 is mounted on the end of the rotating shaft 31, and an adapting protrusion is mounted on the knob 311. A torsion spring 312 is sleeved on the rotating shaft 31, one end of which is clamped to the bottom of the cover plate 2 and the other end is clamped to the turntable 3. The adapting protrusion on the knob 311 facilitates the operator to apply force, achieving rapid rotation of the turntable 3. The torsion spring 312 not only provides reset force, but also cushions the rotation of the turntable 3, reducing mechanical wear and extending the service life of the device.

[0045] like Figures 1 to 8 As shown, in this embodiment, a negative pressure tube 321 is connected to the bottom of the negative pressure chamber 14, and the surface of the turntable 3 is in contact with the negative pressure port of the negative pressure tube 321, with the notch 32 being larger than the size of the negative pressure tube 321. This design ensures that the negative pressure port can be fully opened and closed when the turntable 3 rotates, achieving precise control of the negative pressure adsorption of bubbles and ensuring the reliability of the bubble removal effect.

[0046] like Figures 1 to 8As shown, a compensation cover 335 is mounted at the bottom of the negative pressure chamber 14. A push plate 333 slides within the compensation cover 335, and a push rod 331 is mounted on the push plate 333. The push rod 331 movably extends through the compensation cover 335. A ball 332 is mounted at the end of the push rod 331. The ball 332 is slidably connected to a ramp 334 on the surface of the guide block 33. The contact between the ball 332 and the ramp 334 converts sliding friction into rolling friction, effectively reducing friction, improving the smoothness and response speed of the compensation process, and making the compensation of the molten aluminum more timely and accurate, further improving the quality of the casting.

[0047] The implementation principle of a split top mold structure of the present invention is as follows:

[0048] First, when using the device, the top mold 1 and the bottom mold are assembled first, where the bottom mold is not drawn in the figure. When the two are assembled, a hub-shaped cavity is formed. Then the operator injects molten aluminum liquid into the interior through the connecting pipe 21, and the negative pressure cavity 14 is in a negative pressure state (why the negative pressure cavity is in a negative pressure state will be explained later). The above structure enables the use of negative pressure to absorb bubbles immediately after the aluminum liquid is injected, avoiding the residual bubbles affecting the quality of the casting. Compared with the traditional mold which requires an additional vacuum step, the production efficiency is greatly improved.

[0049] When the internal chamber is fully filled, the aluminum liquid will lift the push plate 333 to move to the top of the compensation cover 335, and then fill the entire compensation cover 335 to facilitate subsequent compensation operations.

[0050] When the aluminum liquid is filled, the operator turns the knob 311 , wherein the knob 311 drives the turntable 3 to rotate via the rotating shaft 31 . At this time, the torsion spring 312 on the turntable 3 is twisted synchronously, and the torsion spring 312 facilitates the subsequent reset operation.

[0051] During the rotation of the turntable 3, when the notch 32 on the turntable 3 and the negative pressure tube 321 correspond to each other, the negative pressure inside the negative pressure chamber 14 will absorb the bubbles in the aluminum liquid and move them toward the negative pressure chamber 14, thereby achieving the purpose of removing bubbles from the aluminum liquid.

[0052] However, after the bubbles are removed, the molten aluminum still doesn't fully fill the cavity. Therefore, as turntable 3 rotates, the guide block 33 at its bottom rotates with it, and the slope 334 on the surface of the guide block 33 contacts the ball 332. As the guide block 33 rotates, the slope 334 pushes the ball 332, which in turn drives the push rod 331 and push plate 333 to slide downward within the compensation cover 335. The push plate 333 squeezes the molten aluminum, which has been pre-filled by the molten aluminum in the compensation cover 335, into the mold cavity, compensating for the holes caused by the bubbles and ensuring that the molten aluminum fully fills the cavity. This mechanically linked compensation mechanism automatically fills the actual gaps after the bubbles are expelled, achieving closed-loop control of the casting process, ensuring uniform density of the casting, and improving product yield.

[0053] Then the operator resets the turntable 3 via the torsion spring 312 .

[0054] The operator then leaves the chamber 14 to rest for a while. The heat from the molten aluminum itself heats the distilled water in the negative pressure chamber 14, and the boiling distilled water produces steam, which increases the pressure inside the negative pressure chamber 14. This increased pressure pushes the piston 23 to slide within the sliding chamber 221. The piston 23, via the sliding rod 231, drives the connecting plate 244, the guide cover 242, and the vertical rod 241 to move synchronously, thereby pushing the diverter table 24 upward. When the piston 23 moves to the pressure relief hole 223 connected to the negative pressure chamber 14, it prevents excessive pressure in the chamber caused by the vaporization of the distilled water, which affects the stability of the device. The diverter table 24 pushes out the excess molten aluminum in the connecting pipe 21 and discharges the excess aluminum to ensure casting accuracy. This fully utilizes the waste heat of the molten aluminum without consuming additional energy, which is both environmentally friendly and cost-effective. The piston-diverter table linkage structure accurately controls the discharge of excess molten aluminum, ensuring that the amount of molten aluminum injected meets casting requirements and improves product consistency.

[0055] As cold water is introduced into cooling tube 15 (which is conventional technology and whose operating principle is not detailed here), the molten aluminum gradually cools and solidifies. With the introduction of cooling tube 15, the temperature of the molten aluminum decreases, and simultaneously, cooling tube 15 cools negative pressure chamber 14. At this point, the water vapor within negative pressure chamber 14 begins to cool and condense into liquid water. According to the ideal gas state equation PV=nRT (where P represents pressure, V represents gas volume, n represents the amount of gas, R is the ideal gas constant, and T represents the thermodynamic temperature), if the chamber volume V remains unchanged, the amount of gas n decreases due to condensation of water vapor, and the temperature T decreases, the pressure P will significantly decrease, causing negative pressure to re-establish within negative pressure chamber 14, preparing for bubble adsorption during the next casting process (this state explains why negative pressure chamber 14 is initially in a negative pressure stage). This structure achieves self-circulating negative pressure, eliminating the need for external exhaust equipment and simplifying the equipment structure. The coordinated design of the cooling tube and negative pressure chamber ensures that the negative pressure chamber is at an ideal negative pressure before each casting, improving process stability.

[0056] At the same time, the return spring 232 is deformed when the piston 23 moves under the steam pressure. When the pressure in the negative pressure chamber 14 decreases, the return spring 232 provides a restoring force to push the piston 23 back to its original state, so that the device returns to its initial state for the next casting cycle.

Claims

1. A split top mold structure, comprising a top mold (1), characterized in that: The top mold (1) is provided with a negative pressure cavity (14) for absorbing bubbles and filled with distilled water, and the negative pressure cavity (14) is covered with a cover plate (2); A connecting pipe (21) is mounted on the cover plate (2) and is in communication with the bottom of the top mold (1). A temperature-raising ejection assembly is mounted on the connecting pipe (21). The temperature-raising ejection assembly comprises a piston (23) inserted into the negative pressure cavity (14) and a diverter (24) inserted into the inner cavity of the connecting pipe (21). The piston (23) slides after the pressure in the negative pressure chamber (14) increases until it moves to the pressure relief hole (223) connected to the negative pressure chamber (14), and drives the diverter (24) to push out the excess aluminum liquid in the connecting pipe (21), and after the temperature of the negative pressure chamber (14) is restored, the steam is cooled to generate a negative pressure state inside; An air extraction self-compensation component is installed inside the negative pressure chamber (14), and the air extraction self-compensation component includes a turntable (3) for sealing the negative pressure port inside the negative pressure chamber, and a notch (32) for opening the negative pressure port is provided on the turntable (3), and a guide block (33) for squeezing excess aluminum liquid into the mold cavity is installed at the bottom of the turntable (3), thereby compensating for holes caused by air bubble overflow; A positioning sleeve (22) is mounted on the cover plate (2) and is in communication with the negative pressure chamber (14). A sliding chamber (221) is provided inside the positioning sleeve (22), and the end of the sliding chamber (221) is in communication with the mounting chamber (222). A pressure relief hole (223) for pressure relief is provided on the side wall of the sliding chamber (221), and the bottom of the sliding chamber (221) is movably connected to the piston (23). A slide rod (231) is installed on the piston (23), and the slide rod (231) is movable through the positioning sleeve (22). A limit plate (233) is installed on the side wall of the slide rod (231), and the limit plate (233) is overlapped above the positioning sleeve (22). A return spring (232) is sleeved on the side wall of the slide rod (231), and one end of the return spring (232) is clamped on the inner wall of the installation cavity (222), and the other end of the return spring (232) is clamped on the upper surface of the piston (23); A connecting plate (244) is installed on the top of the sliding rod (231), and the connecting plate (244) is placed above the connecting pipe (21). A guide cover (242) is installed on the bottom of the connecting plate (244). The guide cover (242) is conical, and the bottom is inserted into the bottom of the connecting pipe (21). Two vertical rods (241) are connected to the bottom of the guide cover (242). The two vertical rods (241) are parallel to each other, and the bottoms of the vertical rods (241) are connected to the surface of the diverter (24).

2. A split top mold structure according to claim 1, characterized in that: Four positioning grooves (111) are provided at the bottom corners of the top mold (1), positioning rods (11) are installed inside the four positioning grooves (111), and the positioning rods (11) are in a vertical state. The positioning rods (11) and the bottom mold adapted to the top mold (1) are plugged into each other, and a mounting hole (13) is provided on the side wall of the top mold (1), and a mounting groove (131) is provided at the bottom of the mounting hole (13) and is communicated with the bottom mold, and the mounting groove (131) is used for connecting bolts.

3. A split top mold structure according to claim 1, characterized in that: A mold core (12) is provided at the bottom of the top mold (1), a countersunk groove (141) is provided on the negative pressure cavity (14), the cover plate (2) is mounted on the countersunk groove (141), and the two are adapted in size, and a cooling pipe (15) is installed inside the top mold (1) and is interconnected with the bottom mold, and the cooling pipe (15) passes through the internal chamber of the negative pressure cavity (14).

4. A split top mold structure according to claim 1, characterized in that: The bottom of the connecting pipe (21) is provided with a conical arc surface (211), the surface of the diverter platform (24) is in an inclined state, and the connecting pipe (21) and the diverter platform (24) are adapted to each other. The cover plate (2) is provided with an inner groove (213), the inner groove (213) is annular, and a collecting cover (212) is mounted on the inner groove (213) by bolts. The collecting cover (212) is sleeved on the outside of the connecting pipe (21), and the top of the connecting pipe (21) and the top of the collecting cover (212) are on the same plane, and the outer edge of the top of the collecting cover (212) is chamfered.

5. The split top mold structure according to claim 1, characterized in that: A rotating shaft (31) is mounted on the turntable (3), the rotating shaft (31) movably passing through the cover plate (2), a knob (311) is mounted on the end of the rotating shaft (31), and an adapting protrusion is mounted on the knob (311), a torsion spring (312) is sleeved on the rotating shaft (31), one end of the torsion spring (312) is clamped to the bottom of the cover plate (2), and the other end is clamped to the turntable (3).

6. A split top mold structure according to claim 1, characterized in that: The bottom of the negative pressure chamber (14) is connected to a negative pressure tube (321), and the surface of the turntable (3) is fitted on the negative pressure port of the negative pressure tube (321), and the size of the notch (32) is larger than that of the negative pressure tube (321).

7. The split top mold structure according to claim 1, characterized in that: A compensation cover (335) is installed at the bottom of the negative pressure chamber (14), a push plate (333) is slidably provided inside the compensation cover (335), and a push rod (331) is installed on the push plate (333), the push rod (331) movably passes through the compensation cover (335), and a rolling ball (332) is installed at the end of the push rod (331), and the rolling ball (332) is slidably connected to a slope (334) provided on the surface of the guide block (33).

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