Oil cylinder structure of aluminum alloy die-casting die

Abstract

The utility model discloses an oil cylinder structure of an aluminum alloy die-casting die, which relates to an oil cylinder design for precision equipment and an automatic system and comprises a connecting plate, a cylinder body, a piston rod, a cylinder sleeve and a plurality of unloading blocks. Through the design of the unloading blocks stacked up and down in the cylinder sleeve, uniform dispersion of pressure in the oil cylinder is achieved, the phenomenon of pressure movement caused by lack of a wedging device is avoided, and then looseness of the oil cylinder connecting structure is prevented. Meanwhile, the exhaust steel plate and the exhaust hole are arranged at the upper end of the cylinder sleeve, gas in the oil cylinder can be effectively exhausted, and pressure stability in the working process is ensured. In addition, a pin pulling hole is designed in the center of each force unloading block, so that maintenance personnel can conveniently and quickly disassemble and replace parts, and the daily maintenance efficiency of equipment is improved. The utility model has the advantages of uniform pressure dispersion, convenience in maintenance, safety and reliability, and is suitable for being applied to the die-casting mould oil cylinder in a high-pressure working environment.

Description

Technical Field

[0001] The utility model relates to an oil cylinder structure, in particular to an oil cylinder structure for an aluminum alloy die-casting mold. Background Art

[0002] Most of the existing oil cylinder structures for aluminum alloy die-casting molds adopt a wedging device to ensure the pressure stability during pressurization and the reliability of the oil cylinder connection. Usually, when the oil cylinder bears pressure, the wedging device can effectively disperse the pressure transmitted to the cylinder block and the piston rod, avoiding the loosening of components caused by pressure imbalance. However, this traditional design has obvious limitations in some specific environments:

[0003] 1. Pressure crosstalk problem: When there is no effective pressure dispersion mechanism inside the oil cylinder, the pressurized pressure often crosstalks in the oil cylinder and the connection structure. This crosstalk will cause the connection part of the oil cylinder to loosen, thus reducing the stability of the entire system, increasing the possibility of failures during the operation of the equipment, and further causing safety hazards such as oil leakage.

[0004] 2. Difficult maintenance: Although the design of the traditional wedging device can provide certain pressure stability, its complex mechanical structure also makes maintenance difficult. Especially after long-term operation, the wear of the wedging device will affect the operation efficiency of the system. The process of disassembling, installing, and replacing components is often time-consuming and laborious, increasing the downtime of the equipment. Summary of the Invention

[0005] The purpose of the utility model is to solve the limitations of the wedging device in the existing oil cylinder structure, and provide an oil cylinder structure for an aluminum alloy die-casting mold, which can maintain pressure stability under the condition of a compact structure, avoid the connection loosening problem caused by pressure crosstalk, and at the same time greatly improve the convenience of equipment maintenance and component replacement.

[0006] The utility model is realized through the following technical solutions: An oil cylinder structure for an aluminum alloy die-casting mold includes a connecting plate, a cylinder block, a piston rod, a cylinder sleeve, and a plurality of pressure relief blocks. A positioning pin is provided at the lower end of the connecting plate, a lifting hole is provided on the outer surface of the connecting plate, the upper end of the connecting plate is fixedly connected to the lower end of the cylinder block 1, the upper end of the piston rod passes through the central hole of the connecting plate and enters the cylinder block, the lower end of the piston rod remains outside the cylinder block, a piston is provided on the piston rod, the piston divides the interior of the cylinder block into a front chamber and a rear chamber, a front chamber oil pipe docking port is provided on the front chamber, a rear chamber oil pipe docking port is provided on the rear chamber, a through hole is provided at the upper end of the cylinder block, a plurality of sealing rings are installed in the through hole, the upper end of the piston rod passes through the through hole and contacts the sealing rings, the upper end of the cylinder block is connected to the lower end of the cylinder sleeve, a plurality of pressure relief blocks stacked up and down are provided in the cylinder sleeve, an exhaust steel plate is installed at the upper end of the cylinder sleeve, and uniformly distributed exhaust holes are provided on the exhaust steel plate.

[0007] A pull pin hole is provided at the center position of each pressure relief block.

[0008] A pull pin hole is provided at the center position of each unloading block, and the number of unloading blocks can be adjusted according to the pressure requirement.

[0009] The utility model has the following advantages compared with the prior art:

[0010] By canceling the wedging device and adopting the stacking of unloading blocks and the exhaust design, the utility model not only greatly reduces the pressure fluctuation in the oil cylinder, avoids the loosening of the connection structure, but also greatly improves the maintenance convenience of the equipment through the setting of the pull pin hole. This structure is particularly suitable for working occasions with limited space and complex structures, such as the oil cylinder structures of precision equipment and automation systems, and has a wide application prospect. The sealing ring is made of oil-resistant and high-temperature-resistant materials to ensure reliable sealing performance in a high-pressure working environment. The exhaust holes on the exhaust steel plate are designed as uniformly distributed micropores, which can gradually discharge the gas accumulated inside the oil cylinder and maintain the pressure stability inside the cylinder body. The material of the unloading block is selected as a high-pressure-resistant material, which can effectively disperse the pressure from the oil cylinder in a high-pressure environment, avoid pressure concentration, prevent the loosening of the oil cylinder connection structure. This stacking design can not only improve the uniform distribution of pressure, but also reduce the structural instability problem caused by pressure fluctuation inside the oil cylinder. Description of the Drawings

[0011] Figure 1 It is a schematic structural diagram of the utility model.

[0012] Figure 2 It is a schematic top view structural diagram of the utility model.

[0013] Reference numerals in the figure: cylinder block - 1, piston rod 2, cylinder liner - 3, positioning pin - 4, lifting hole - 5, piston - 6, front chamber - 7, rear chamber - 8, connecting plate - 9, front chamber oil pipe docking port - 10, rear chamber oil pipe docking port - 11, sealing ring - 12, unloading block - 13, pull pin hole - 14, exhaust steel plate - 15. Specific Embodiments

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below. Apparently, the described embodiments are some, but not all, of the embodiments of the utility model. The elements and features described in one embodiment of the utility model can be combined with the elements and features shown in one or more other embodiments. It should be noted that, for the sake of clarity, the representation and description of components and processes that are irrelevant to the utility model and known to those of ordinary skill in the art are omitted in the description. Based on the embodiments of the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the utility model.

[0015] An oil cylinder structure for an aluminum alloy die-casting mold, comprising a connecting plate 9, a cylinder block 1, a piston rod 2, a cylinder sleeve 3 and a plurality of force-relieving blocks 13. A positioning pin 4 is provided at the lower end of the connecting plate 9, and a lifting hole 5 is provided on the outer surface of the connecting plate 9 for lifting operations during installation and maintenance, simplifying the assembly and debugging of the equipment.

[0016] The upper end of the connecting plate 9 is fixedly connected to the lower end of the cylinder block 1. The upper end of the piston rod 2 passes through the central hole of the connecting plate 9 and enters the cylinder block 1, and the lower end of the piston rod 2 remains outside the cylinder block 1. A piston 6 is provided on the piston rod 2, and the piston 6 divides the interior of the cylinder block 1 into a front chamber 7 and a rear chamber 8. A front chamber oil pipe docking port 10 is provided on the front chamber 7, and a rear chamber oil pipe docking port 11 is provided on the rear chamber 8. A through hole is provided at the upper end of the cylinder block 1, and a plurality of sealing rings 12 are installed in the through hole. The upper end of the piston rod 2 passes through the through hole and contacts the sealing rings 12. The sealing rings 12 are made of oil-resistant and high-temperature-resistant materials to ensure the sealing effect in a high-pressure working environment and avoid oil leakage.

[0017] The upper end of the cylinder block 1 is connected to the lower end of the cylinder sleeve 3. A plurality of force-relieving blocks 13 stacked vertically are provided in the cylinder sleeve 3. The material of the force-relieving blocks 13 is selected as a high-pressure-resistant material, which can effectively disperse the pressure from the oil cylinder in a high-pressure environment, avoid pressure concentration, and prevent the loosening of the oil cylinder connection structure. This stacked design can not only improve the uniform distribution of pressure but also reduce the structural instability problems caused by pressure crosstalk inside the oil cylinder.

[0018] An exhaust steel plate 15 is installed at the upper end of the cylinder sleeve 3, and uniformly distributed exhaust holes are provided on the exhaust steel plate 15 to effectively discharge the gas accumulated in the oil cylinder during the operation of the oil cylinder and maintain the pressure stability of the oil cylinder system.

[0019] A pin-pulling hole 14 is provided at the center position of each force-relieving block 13, greatly improving the maintenance convenience of the equipment.

[0020] A pin-pulling hole 14 is provided at the center position of each force-relieving block 13, and the number of force-relieving blocks 13 can be adjusted according to the pressure requirements.

[0021] Working principle:

[0022] After the oil cylinder starts to work, the hydraulic system alternately supplies pressure oil to the front chamber 7 and the rear chamber 8 of the oil cylinder through the front chamber oil pipe docking port 10 and the rear chamber oil pipe docking port 11. When the hydraulic oil enters the front chamber 7 or the rear chamber 8 of the oil cylinder, it pushes the piston rod 2 to make a reciprocating linear motion.

[0023] The traditional wedging device inside the oil cylinder is cancelled, and the unloading blocks 13 stacked up and down are used to replace the traditional pressure transmission mechanism. Multiple unloading blocks are stacked up and down inside the cylinder liner 3. These unloading blocks can evenly distribute the pressure from the hydraulic oil to the inner wall of the entire cylinder block 1, avoiding the phenomenon of excessive local pressure. To better describe the pressure dispersion effect of the unloading blocks, the unit pressure F after pressure dispersion can be calculated by the following formula:

[0024] P 总 =P / n

[0025] where P 总 is the total pressure inside the oil cylinder, n is the number of unloading blocks. By increasing the number n of unloading blocks, the pressure borne by a single unloading block can be effectively reduced, thereby reducing the local stress and protecting the stability of the oil cylinder structure.

[0026] The thrust F of the oil cylinder is the core index of the system working performance. There is a direct relationship between the thrust, the pressure P and the effective area A of the piston. The calculation formula for the thrust is:

[0027] F 推 =P·n·A

[0028] where, A is the effective area of the piston, n is the number of unloading blocks, and P is the pressure after the unloading blocks disperse the pressure.

[0029] In addition, there is also an association between the flow rate Q of the hydraulic oil inside the oil cylinder and the movement speed v of the piston. The relationship is:

[0030] V=Q / A

[0031] This formula describes that under the condition of a certain flow rate Q, the movement speed of the piston is inversely proportional to its effective area. By adjusting the flow rate Q of the hydraulic system, the movement speed v of the piston can be adjusted, thereby controlling the output power of the oil cylinder.

[0032] During the working process of the oil cylinder, especially when the hydraulic system suddenly changes or the pressure suddenly changes, an impact force F may be generated inside the system 冲击 . The magnitude of the impact force can be calculated by the following formula:

[0033] F 冲击 =m·a

[0034] where, m is the mass of the liquid or the piston, and a is its acceleration. To avoid the damage of the impact force to the oil cylinder structure, the design of the unloading blocks helps to disperse this instantaneous pressure concentration and reduce the negative impact of the impact force on the structure.

[0035] By integrating the relationships of thrust, flow rate, speed and impact force, the total force formula of the entire oil cylinder system can be obtained, comprehensively describing the influence of each parameter of the system on the performance of the oil cylinder:

[0036] F = P·n·Q / v + m·a

[0037] Wherein, F is the total acting force in the system, which includes the superposition of the thrust force and the impact force; P is the unit pressure after dispersion; n is the number of force-relieving blocks; Q is the flow rate of the hydraulic oil; v is the moving speed of the piston; and m·a represents the impact force in the system.

[0038] This formula can effectively describe the functions of the force-relieving blocks in terms of dispersing pressure, regulating the thrust force and speed of the system, and reducing the impact force, thereby ensuring the stability and high efficiency of the oil cylinder in a high-pressure working environment.

[0039] During the working process of the oil cylinder, the high-pressure oil in the hydraulic system will squeeze the air inside the cylinder block. If this air cannot be discharged in time, it may affect the stability of the system and even lead to faults in the hydraulic system. For this reason, the present utility model designs an exhaust steel plate 15 at the upper end of the cylinder liner 3, and a plurality of exhaust holes are provided on the steel plate.

[0040] During the use of the equipment, if any component wears or malfunctions, the maintenance personnel can quickly disassemble and replace the force-relieving block 13 through the pin removal hole 14, which simplifies the maintenance operation of the equipment. This design greatly shortens the downtime of the equipment and improves the operating efficiency of the equipment.

[0041] Through the comprehensive application of the above detailed working principle and formula, the present utility model can, without using a wedging device, achieve uniform pressure distribution, control the impact force, and ensure the high-efficiency working performance of the oil cylinder through the dispersed design of the force-relieving blocks. This design greatly improves the stability and maintenance convenience of the equipment, and is particularly suitable for high-pressure and complex working environments.

[0042] Finally, it should be noted that: Although the present utility model and its advantages have been described in detail above, it should be understood that various changes, substitutions, and transformations can be made without exceeding the spirit and scope of the present utility model as defined by the appended claims. Moreover, the scope of the present utility model is not limited to the specific embodiments of the processes, equipment, means, methods, and steps described in the specification. Those of ordinary skill in the art will readily understand from the disclosure of the present utility model that processes, equipment, means, methods, or steps that can perform substantially the same functions as the corresponding embodiments described herein or achieve substantially the same results can be used according to the present utility model, both existing and to be developed in the future. Therefore, the appended claims are intended to cover such processes, equipment, means, methods, or steps within their scope.

Claims

1. An oil cylinder structure for an aluminum alloy die-casting mold, comprising a connecting plate (9), a cylinder block (1), a piston rod (2), a cylinder liner (3) and a plurality of unloading blocks (13). A positioning pin (4) is provided at the lower end of the connecting plate (9), and a lifting hole (5) is provided on the outer surface of the connecting plate (9). The upper end of the connecting plate (9) is fixedly connected to the lower end of the cylinder block (1). The upper end of the piston rod (2) passes through the central hole of the connecting plate (9) and enters the cylinder block (1), and the lower end of the piston rod (2) remains outside the cylinder block (1). A piston (6) is provided on the piston rod (2), and the piston (6) divides the interior of the cylinder block (1) into a front chamber (7) and a rear chamber (8). A front chamber oil pipe docking port (10) is provided on the front chamber (7), and a rear chamber oil pipe docking port (11) is provided on the rear chamber (8). A through hole is provided at the upper end of the cylinder block (1), and a plurality of sealing rings (12) are installed in the through hole. The upper end of the piston rod (2) passes through the through hole and contacts the sealing ring (12). It is characterized in that: The upper end of the cylinder block (1) is connected to the lower end of the cylinder liner (3). A plurality of unloading blocks (13) stacked up and down are arranged in the cylinder liner (3). An exhaust steel plate (15) is installed at the upper end of the cylinder liner (3), and uniformly distributed exhaust holes are provided on the exhaust steel plate (15).

2. The oil cylinder structure of an aluminum alloy die-casting mold according to claim 1, characterized in that: A pin extraction hole (14) is provided at the central position of each unloading block (13).

3. The oil cylinder structure of an aluminum alloy die-casting mold according to claim 1, wherein: A pin extraction hole (14) is provided at the central position of each unloading block (13), and the number of the unloading blocks (13) can be adjusted according to the pressure requirement.

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