Auxiliary demolding structure of low-pressure casting machine and low-pressure casting machine

Abstract

The invention discloses an auxiliary demolding structure of a low-pressure casting machine, and belongs to the technical field of casting equipment. In order to solve the problems of low efficiency, unstable product quality and the like in the demolding process of an existing low-pressure casting machine, the structure comprises a transition plate, one side of the transition plate is attached and fixed to a mold ejecting equipment plate, a second T-shaped bolt groove is formed in the other side of the transition plate, and a plurality of oil cylinders are evenly distributed on the second T-shaped bolt groove and fixed through T-shaped bolts. The oil cylinder is connected with a hydraulic pump station through a hydraulic pipeline to achieve driving. The transition plate is of a regular polygon plate-shaped structure, the second T-shaped bolt grooves are evenly distributed in a central symmetry mode, and installation notches are formed in the periphery of the transition plate and correspondingly connected with the first T-shaped bolt grooves in the top die equipment plate. The fixed end of the oil cylinder is provided with a fixed disc, and the fixed disc is provided with a waist groove matched with the T-shaped bolt for installation. A receding hole is formed in the center of the transition plate, and the hydraulic pipeline penetrates out of the receding hole. The demolding device can effectively assist the demolding operation of the low-pressure casting machine, and the demolding efficiency and the product quality are improved.

Description

Technical Field

[0001] This invention relates to the field of demolding technology for low-pressure casting machines, specifically an auxiliary demolding structure for low-pressure casting machines and a low-pressure casting machine. Background Technology

[0002] Low-pressure casting technology, as an important metal forming process, is widely used in the production of precision castings in the automotive, aerospace, and other fields. In the low-pressure casting process, the demolding process is a critical step affecting casting quality and production efficiency, requiring a specialized demolding device to eject the casting from the mold.

[0003] Existing low-pressure casting machine demolding systems primarily employ hydraulic drives. Chinese patent CN215566966U discloses a hydraulic system for a low-pressure casting machine, which controls the robotic arm through a hydraulic station, main oil pipe, and a hydraulic-electric hybrid slip ring, enabling remote control of the oil flow proportionally. Chinese patent CN211489602U discloses a mold dismantling mechanism for a low-pressure casting machine, including a multi-layer plate structure and a dismantling pump, which pushes the forming mold for demolding via struts and diagonal braces. Chinese patents CN107876733A and CN207787666U describe a multi-functional aluminum alloy low-pressure casting machine that uses a combination of pneumatic and hydraulic cylinders to achieve demolding functionality. Chinese patent CN207464176U discloses a low-pressure casting machine equipped with a top mold hydraulic cylinder connected to a top mold mounting plate via a limit plate, enabling precise control of the top mold.

[0004] However, existing low-pressure casting machine demolding systems have the following technical defects: First, the effective force range of traditional top mold ejection devices is limited, typically only providing effective ejection force within a central 500mm×500mm area. This narrow ejection range cannot meet the demolding requirements of large castings with a transverse area of ​​1000mm×1000mm or more. Second, due to the structural limitations of the existing top ejection mechanism and bottom platform, the range of transverse products that can be handled is narrow, limiting the equipment's applicability. Third, hydraulic cylinders cannot be directly installed on the existing top mold equipment plate, lacking suitable installation interfaces and fixing structures. Finally, the sizes of molds vary on-site, and interference easily occurs during cylinder installation for different mold sizes, severely affecting the equipment's versatility and adaptability to different molds, thus reducing production efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide an auxiliary demolding structure for a low-pressure casting machine and a low-pressure casting machine, which solves the problem that the range of transverse products that can be handled is narrow due to the limitations of the top ejection mechanism and bottom platform of existing equipment. It also overcomes the shortcomings of the existing top mold equipment plate, which cannot directly install hydraulic cylinders, and the interference phenomenon that occurs when installing hydraulic cylinders for different mold specifications, thus affecting the versatility and adaptability of the equipment.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an auxiliary demolding structure for a low-pressure casting machine, comprising a transition plate, one side of which is attached and fixed to a top mold equipment plate, and the other side of which is provided with a second T-bolt groove, on which multiple hydraulic cylinders are evenly distributed and fixed by T-bolts; the multiple hydraulic cylinders are driven by a hydraulic pump station connected to a hydraulic pipeline.

[0007] Preferably, the transition plate has a regular polygonal plate structure, and the second T-shaped bolt grooves on the side of the transition plate where the oil cylinder is installed are evenly distributed in a centrally symmetrical manner; the transition plate is also provided with mounting slots around its perimeter that correspond to the first T-shaped bolt grooves on the top mold equipment plate, and are fixedly connected and installed by T-shaped bolts.

[0008] Furthermore, four hydraulic cylinders are installed at the four corners of the transition plate, and a fixing plate is provided at the fixed end of the hydraulic cylinder. A waist groove is opened on the circumference of the fixing plate, and the fixing plate is installed on the second T-bolt groove by T-bolts in conjunction with the waist groove.

[0009] Preferably, a clearance hole is provided at the center of the transition plate corresponding to the reserved hole at the top of the top mold equipment plate, and the hydraulic pipeline of the oil cylinder passes through the clearance hole and the reserved hole at the top of the top mold equipment plate.

[0010] Furthermore, the transition plate has a recessed disc-shaped groove at its center, and the clearance holes are evenly distributed within the disc-shaped groove.

[0011] Preferably, the hydraulic pump station includes an oil tank, a level and temperature gauge, a drain valve, an air filter, a level sensor, a temperature gauge, a return oil filter, a motor, a bell-shaped housing, a coupling, and a plunger pump. The hydraulic pipeline is connected to an electro-hydraulic directional valve, a relief valve, a dual-hydraulic control check valve, a throttle valve, and a flow divider. The level and temperature gauge, drain valve, air filter, level sensor, and temperature gauge are all mounted on the oil tank. The return oil filter is installed at the return port of the oil tank. The plunger pump is connected to the outlet port of the oil tank, and the inlet pipe of the plunger pump is inserted into the bottom inner side of the oil tank. The motor is fixedly mounted on the oil tank and connected via a coupling. The coupling is fixedly installed at the input end of the plunger pump. A bell-shaped cover is installed on the outside of the coupling and fixedly installed with the motor. The overflow valve is connected to the oil outlet and return oil filter of the plunger pump through pipes. The overflow valve is connected to the electro-hydraulic directional valve through pipes. The electro-hydraulic directional valve is connected to the dual hydraulic control check valve through pipes. The dual hydraulic control check valve is connected to the throttle valve through pipes. One port of the throttle valve is connected to the distributor through pipes. The four distributor ports on the distributor are connected to the oil inlet of the cylinder through pipes. The other port of the throttle valve is connected to the return oil port of the four cylinders through pipes.

[0012] Furthermore, a pressure gauge is also connected to the overflow valve.

[0013] Preferably, ball valves are connected to the pipes connecting the throttle valve and the flow divider to the oil cylinder.

[0014] Compared with existing technologies, the beneficial effects of this invention are as follows: by installing multiple synchronously operating hydraulic cylinders on the transition plate, effective impact on the mold top plate is achieved, solving the problem of large castings being unable to be demolded smoothly; the casting capacity of the equipment is greatly improved; an independent hydraulic pump station pressure supply system is adopted, avoiding interference with the main system and ensuring the stability of system operation; through synchronous hydraulic cylinder calibration and flow divider design, the coordinated operation of multiple hydraulic cylinders is ensured, improving the reliability of demolding; the range of transverse products that can be undertaken is expanded, enhancing the market adaptability and economic benefits of the metal mold low-pressure casting production line. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the auxiliary demolding structure for a low-pressure casting machine.

[0016] Figure 2 This is a bottom view of a partial structural sample in the auxiliary demolding structure of a low-pressure casting machine.

[0017] Figure 3 This is a top view of the hydraulic cylinder in the auxiliary demolding structure of a low-pressure casting machine.

[0018] Figure 4 This is a partial sectional view of the hydraulic cylinder in the auxiliary demolding structure of a low-pressure casting machine.

[0019] Figure 5 This is a diagram showing the hydraulic pipeline connection in the auxiliary demolding structure of a low-pressure casting machine.

[0020] In the diagram: 1. Transition plate; 2. Mounting slot; 3. Top mold plate; 4. Hydraulic cylinder; 5. Fixing plate; 6. Waist groove; 7. Second T-bolt groove; 8. Clearance hole; 9. Oil tank; 10. Liquid level and temperature gauge; 11. Drain valve; 12. Air filter; 13. Liquid level sensor; 14. Temperature gauge; 15. Return oil filter; 16. Motor; 17. Bell jar; 18. Coupling; 19. Piston pump; 20. Electro-hydraulic directional valve; 21. Overflow valve; 22. Dual-hydraulic check valve; 23. Throttle valve; 24. Flow divider; 25. Pressure gauge; 26. Ball valve; 27. First T-bolt groove. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example

[0022] This embodiment provides an auxiliary demolding structure for a low-pressure casting machine, such as... Figure 1-5 As shown, the main components include a transition plate 1, a top mold equipment plate 3, a hydraulic cylinder 4, and a hydraulic pump station. The transition plate 1 has a regular polygonal plate structure, with one side fixed to the top mold equipment plate 3. This fixed connection method enables the effective modification of the existing top mold equipment and solves the technical problem that the original equipment could not be directly installed with hydraulic cylinders.

[0023] The transition plate 1 has mounting slots 2 around its perimeter, which correspond to the first T-bolt slots 27 on the top mold equipment plate, and are fixedly connected and installed by T-bolts. This connection method ensures reliable fixation between the transition plate and the top mold equipment plate, providing a stable foundation support for the entire demolding structure.

[0024] A second T-bolt groove 7 is provided on the other side of the transition plate 1. This groove is evenly distributed in a centrally symmetrical manner, providing a standardized fixed position for the installation of the hydraulic cylinders. Four hydraulic cylinders 4 are installed at the four corners of the transition plate, and each cylinder has a fixing plate 5 at its fixed end. The fixing plate 5 has a circumferential groove 6, and the fixing plate is installed on the second T-bolt groove 7 using T-bolts that engage with the groove 6. This installation method not only ensures the stable installation of the hydraulic cylinders but also allows for positional adjustments within a certain range, effectively avoiding interference that may occur with molds of different specifications.

[0025] Cylinder 4 uses a high-performance hydraulic cylinder, such as... Figure 4 As shown, the overall dimensions are 310mm in height, 245mm in diameter, 125mm in cylinder diameter, 90mm in rod diameter, and 120mm in stroke. The rated working pressure is 15MPa. Under this pressure, a single cylinder can provide 15 tons of thrust, and the four cylinders together can provide 60 tons of demolding force, far exceeding the 500mm×500mm effective force range of traditional central demolding devices. This effectively handles the demolding needs of large castings with a transverse area of ​​1000mm×1000mm or more. The cylinder seals are made of high-temperature resistant sealing material, capable of withstanding high-temperature environments up to 300℃, meeting the temperature requirements of low-pressure casting processes.

[0026] A clearance hole 8 is provided at the center of the transition plate 1, corresponding to the pre-reserved hole at the top of the top mold equipment plate. The hydraulic pipeline of the oil cylinder passes through the clearance hole and the pre-reserved hole at the top of the top mold equipment plate, realizing the rational arrangement of the pipeline. A recessed disc-shaped groove is provided at the center of the transition plate, and the clearance holes are evenly distributed in the disc-shaped groove. This design not only ensures the orderly arrangement of the pipeline, but also avoids interference between the pipeline and other components.

[0027] The hydraulic pump station provides the power source for the entire demolding system, such as... Figure 5As shown, the system includes an 80L oil tank 9 made of Q235 steel. A level / temperature gauge 10, a drain valve 11, an air filter 12, a level sensor 13, and a temperature gauge 14 are all installed on the oil tank 9, enabling comprehensive monitoring of the hydraulic system's operating status. A return oil filter 15 is installed at the return port of the oil tank 9 to ensure the cleanliness of the hydraulic oil.

[0028] The motor 16, a 4-pole B35 3KW model, is fixedly mounted on the oil tank 9 and is resistant to high temperatures up to 150℃. It is fixedly connected to the input end of the plunger pump 19 via coupling 18. The plunger pump, model 10YCY-14-1B, is connected to the oil outlet of the oil tank, and its inlet pipe is inserted into the inner bottom of the oil tank to ensure sufficient oil suction. A bell-shaped cover 17 is installed on the outside of the coupling 18 and fixedly mounted to the motor, providing protection.

[0029] The hydraulic control system achieves precise control of the cylinder's movement through a sophisticated valve assembly. The relief valve 21 is connected via pipes to the outlet of the plunger pump 19 and the return filter, controlling the system pressure; the rated pressure is 20 MPa, and the operating pressure is 15 MPa. The relief valve is also connected via a pipe to the electro-hydraulic directional valve 20, which controls the flow of hydraulic oil, thus enabling the extension and retraction of the cylinder 4. The electro-hydraulic directional valve 20 is connected via a pipe to a dual-pivot check valve 22, which in turn is connected to a throttle valve 23, used to regulate the cylinder's movement speed.

[0030] One port of the throttle valve is connected to the distributor 24 via a pipe. The four distributor ports on the distributor 24 are respectively connected to the oil inlets of the four hydraulic cylinders 4 via pipes, ensuring the synchronous action of the four hydraulic cylinders. The other port of the throttle valve is connected to the return ports of the four hydraulic cylinders via a pipe, forming a complete hydraulic circuit. This design achieves synchronous control of the four hydraulic cylinders, ensuring uniform force at all points during demolding and preventing the casting from tilting or being damaged during demolding.

[0031] In a preferred embodiment, a pressure gauge 25, model YN-63 40MPA, is also connected to the relief valve to monitor the system pressure in real time and ensure that the hydraulic system operates within a safe pressure range.

[0032] In a preferred embodiment, ball valves 26, model KHB-16SR, are connected to the pipes connecting the throttle valve and the flow divider to the cylinder. These ball valves can independently control the working status of each cylinder, which facilitates system maintenance and troubleshooting.

[0033] The working principle of the entire low-pressure casting machine's auxiliary demolding structure is as follows: When demolding is required, the hydraulic pump station starts, the motor drives the plunger pump, and hydraulic oil is drawn from the oil tank and pressurized. The pressurized hydraulic oil passes through the overflow valve, electro-hydraulic directional valve, dual-hydraulic check valve, and throttle valve, and is finally distributed to the four cylinders through the distributor. The four cylinders extend synchronously, generating a uniform impact force on the mold's top mold ejector plate, achieving effective demolding of large-area castings. After demolding, the electro-hydraulic directional valve reverses, the hydraulic oil returns to the oil tank through the return oil line, and the cylinders retract and reset, completing one work cycle.

[0034] This structure cleverly solves the problem that existing top mold equipment plates cannot directly install hydraulic cylinders through the design of the transition plate. By evenly distributing and synchronously controlling the four hydraulic cylinders, the effective demolding area is expanded from the original 500mm×500mm to more than 1000mm×1000mm, which greatly improves the demolding capacity of low-pressure casting machines for handling large castings. At the same time, through the standardized installation interface design, interference problems between molds of different specifications are effectively avoided, improving the versatility and adaptability of the equipment. Example

[0035] This embodiment provides a low-pressure casting machine, including a top mold equipment plate, on which an auxiliary demolding structure is installed.

[0036] This low-pressure casting machine effectively solves the technical problem of insufficient demolding capacity in traditional low-pressure casting machines when processing large castings by integrating an auxiliary demolding structure into the top mold equipment plate. As the core component of the low-pressure casting machine, the top mold equipment plate bears the functions of mold opening and closing and demolding. Through its use in conjunction with the auxiliary demolding structure, the demolding capacity of the equipment is significantly improved.

[0037] The auxiliary demolding structure adopts the combination configuration of transition plate, hydraulic cylinders, and hydraulic pump station detailed in Example 1. Through a reliable connection between the transition plate and the top mold equipment plate, four high-performance hydraulic cylinders are evenly distributed on the transition plate to form a distributed demolding force application system. This configuration enables the top mold equipment plate, which originally only had central demolding capability, to obtain a large-area distributed demolding capability, expanding the effective demolding range from 500mm×500mm to over 1000mm×1000mm.

[0038] The pre-set T-bolt slots on the top mold plate precisely correspond to the mounting slots around the transition plate, achieving a secure connection between the two via T-bolts. This standardized connection interface design not only ensures the stable installation of the auxiliary demolding structure but also facilitates its application on low-pressure casting machines of different specifications. The pre-drilled holes at the top of the top mold plate provide passageways for hydraulic pipelines, which, in conjunction with the clearance holes in the center of the transition plate, allow for a rational arrangement of the hydraulic system pipelines.

[0039] During the demolding process, the top mold plate and the auxiliary demolding structure work together. High-pressure hydraulic oil supplied by the hydraulic pump station is distributed to four cylinders through a precision control valve group. The four cylinders extend synchronously to generate a uniform impact force on the top mold ejector plate. This distributed demolding method avoids the stress concentration phenomenon that may occur with traditional center demolding, ensuring that large castings can be smoothly and completely removed from the mold, significantly improving the production efficiency and product quality of low-pressure casting machines.

[0040] This low-pressure casting machine, by integrating an auxiliary demolding structure, significantly improves the demolding capability for large and complex castings while maintaining the basic functions of the original equipment, providing strong equipment support for the application of low-pressure casting technology in the field of large casting production.

[0041] Finally, it should be noted that the above descriptions are merely preferred embodiments of this application, and this application is not limited to the above embodiments. It is understood that other improvements and variations directly derived or conceived by those skilled in the art without departing from the spirit and concept of this application should be considered to be included within the protection scope of this application.

Claims

1. A demolding structure for a low-pressure casting machine, comprising a transition plate (1), characterized in that: One side of the transition plate (1) is attached and fixed to the top mold equipment plate (3), and the other side of the transition plate (1) is provided with a second T-shaped bolt groove (7). Multiple oil cylinders (4) are evenly distributed on the second T-shaped bolt groove (7), and the oil cylinders (4) are fixed on the second T-shaped bolt groove (7) by T-shaped bolts. The multiple oil cylinders (4) are connected to the hydraulic pump station through hydraulic pipelines to achieve driving.

2. The low-pressure casting machine auxiliary demolding structure according to claim 1, characterized in that: The transition plate (1) has a regular polygonal plate structure. The second T-shaped bolt groove (7) on the side of the transition plate (1) where the oil cylinder (4) is installed is evenly distributed in a centrally symmetrical manner. The transition plate (1) is also provided with mounting slots (2) around its perimeter, which correspond to the first T-shaped bolt groove (27) on the top mold equipment plate (3) and are fixedly connected and installed by T-shaped bolts.

3. The low-pressure casting machine auxiliary demolding structure according to claim 2, characterized in that: Four hydraulic cylinders (4) are installed at the four corners of the transition plate (1). The fixed end of the hydraulic cylinder (4) is provided with a fixed plate (5). The fixed plate (5) has a waist groove (6) on its circumference. The fixed plate (5) is installed on the second T-bolt groove (7) by T-bolts in conjunction with the waist groove (6).

4. The low-pressure casting machine auxiliary demolding structure according to claim 1, characterized in that: The transition plate (1) has a clearance hole (8) at the center corresponding to the reserved hole at the top of the top mold equipment plate (3). The hydraulic pipeline of the oil cylinder (4) passes through the clearance hole (8) and the reserved hole at the top of the top mold equipment plate (3).

5. The low-pressure casting machine auxiliary demolding structure according to claim 4, characterized in that: The transition plate (1) has a recessed disc-shaped groove at its center, and the clearance holes (8) are evenly distributed in the disc-shaped groove.

6. The low-pressure casting machine auxiliary demolding structure according to claim 4, characterized in that: The hydraulic pump station includes an oil tank (9), a level and temperature gauge (10), a drain valve (11), an air filter (12), a level sensor (13), a temperature gauge (14), a return oil filter (15), a motor (16), a bell-shaped housing (17), a coupling (18), and a plunger pump (19). The hydraulic pipeline is connected to an electro-hydraulic directional valve (20), a relief valve (21), a dual-hydraulic control check valve (22), a throttle valve (23), and a flow divider (24). The level and temperature gauge (10), drain valve (11), air filter (12), level sensor (13), and temperature gauge (14) are all installed on the oil tank (9). The return oil filter (15) is installed at the return port of the oil tank (9). The plunger pump (19) is connected to the outlet of the oil tank (9), and the inlet pipe of the plunger pump (19) is inserted into the bottom of the oil tank (9). The motor (16)... The valve is fixedly installed on the oil tank (9) and fixedly installed on the input end of the plunger pump (19) through the coupling (18). The bell cover (17) is placed on the outside of the coupling (18) and fixedly installed on the motor (16). The overflow valve (21) is connected to the oil outlet end of the plunger pump (19) and the return oil filter (15) through the pipeline. The overflow valve (21) is connected to the electro-hydraulic directional valve (20) through the pipeline. The electro-hydraulic directional valve (20) is connected to the double hydraulic control check valve (22) through the pipeline. The double hydraulic control check valve (22) is connected to the throttle valve (23) through the pipeline. One port of the throttle valve (23) is connected to the distributor (24) through the pipeline. The four distributor ports on the distributor (24) are connected to the oil inlet of the cylinder (4) through the pipeline. The other port of the throttle valve (23) is connected to the return oil port of the four cylinders (4) through the pipeline.

7. The low-pressure casting machine auxiliary demolding structure according to claim 5, characterized in that: A pressure gauge (25) is also connected to the overflow valve (21).

8. The low-pressure casting machine auxiliary demolding structure according to claim 5, characterized in that: Ball valves (26) are connected to the pipes connecting the throttle valve (23) and the flow divider (24) to the oil cylinder (4).

9. A low-pressure casting machine, comprising a top mold equipment plate, characterized in that: An auxiliary demolding structure as described in any one of claims 1-8 is installed on the top mold equipment plate.

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