Hydraulic system based on alloy die casting

Abstract

The application relates to the technical field of hydraulic systems, and particularly discloses a hydraulic system based on alloy die casting, which comprises a hydraulic cylinder, an electromagnetic valve, a hydraulic pump and an oil tank, further comprises a backflow pipe arranged on the oil tank, a quick connector is arranged in communication between an output end of the hydraulic pump and the hydraulic cylinder, the quick connector is in communication with the backflow pipe, and the quick connector outputs oil to the backflow pipe under pressure spikes. When the hydraulic pump is started, oil first flows to the hose connected with the quick connector, but the hose contains static oil at this time, and the quick connector and the hose will have pressure spikes when pushing the static oil. Especially, the quick connector used for connection is designed for quick docking for convenient maintenance, and is more likely to leak under the condition of pressure spikes. At this time, the quick connector outputs oil to the backflow pipe under the condition of pressure spikes, thereby sharing the pressure at the quick connector and protecting the quick connector.

Description

Technical Field

[0001] This invention relates to hydraulic system technology, specifically a hydraulic system based on alloy die casting. Background Technology

[0002] As is known, a hydraulic system includes power components, actuators, and control components. It outputs oil through a hydraulic pump and delivers fluid to a hydraulic cylinder through the control of a solenoid valve to complete motion control. In the alloy die casting industry, the high pressure of the hydraulic system is used to form parts.

[0003] For example, the invention patent with publication number CN106925742A, publication date July 7, 2017, entitled "A Hydraulic System Based on a Cold Chamber Die Casting Machine," includes a hydraulic system comprising: a top-level unit driving the die casting machine's ejector pin, a feeding unit driving the die casting machine's injection components, and a mold-locking unit driving the die casting mold. The ejector pin unit and mold-locking unit each have one or more dual proportional valves. These dual proportional valves are configured in the actuation circuit to drive the actuation mechanisms of the ejector pin unit and mold-locking unit to perform predetermined actions. This hydraulic system utilizes dual proportional valves to control the movement of the die casting machine, thereby increasing the machine's movement speed during the die casting process. Furthermore, the overall operation is smooth and stable, less prone to vibration, and ensures the successful execution of the die casting process.

[0004] The shortcomings of existing technology are that during alloy die casting, the die casting process is frequent. During the die casting process and the start-up of the hydraulic pump, the oil needs to be suddenly accelerated from a static state. At this time, the pressure in the hydraulic system will rise sharply, forming pressure spikes (water hammer). Pressure spikes are prone to impact at various points, affecting the components of the hydraulic system, especially the hydraulic pipes and joints, which are more likely to leak due to pressure spikes. Summary of the Invention

[0005] The purpose of this invention is to provide a hydraulic system based on alloy die casting to overcome the above-mentioned shortcomings in the prior art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a hydraulic system based on alloy die casting, comprising a hydraulic cylinder, a solenoid valve, a hydraulic pump and an oil tank, and further comprising a return pipe disposed on the oil tank, wherein a quick-connect fitting is connected between the output end of the hydraulic pump and the hydraulic cylinder, the quick-connect fitting is connected to the return pipe, and the quick-connect fitting supplies oil to the return pipe under pressure peaks.

[0007] As a further description of the above technical solution: the quick-connect connector includes a female head and a female head, both of which are provided with movable sealing heads and side end faces. The sealing heads are fitted into the side end faces to seal, and the two sealing heads push against each other to open.

[0008] As a further description of the above technical solution: it also includes a pressure relief mechanism, which includes a clamp on the quick-connect joint to receive a half-ring, the receiving half-ring being connected to the return pipe, and the male and female heads supplying oil to the receiving half-ring under pressure peaks.

[0009] As a further description of the above technical solution: the working end of the female head is movably provided with an outer locking sleeve, the female head is provided with steel balls arranged in a circumferential array, and the outer locking sleeve is provided with a locking ring groove for docking with the steel balls.

[0010] As a further description of the above technical solution: the two ends of the receiving half ring are respectively provided with steel balls and locking ring grooves, so that the two ends of the receiving half ring are respectively engaged with the male head and the female head.

[0011] As a further description of the above technical solution: a side pressure ring is movably provided on the female head, the side pressure ring is driven to fit against the working surface of the female head, and a pressure relief layer is formed between the two. The side pressure ring and the female head are provided with pressure relief chamfers along the axial direction.

[0012] As a further description of the above technical solution: two locking rings are slidably connected to the female head, and the two locking rings lock or unlock the side pressure ring as the outer locking sleeve moves.

[0013] As a further description of the above technical solution: a third spring is provided between the second locking ring and the outer locking sleeve, and an extension block corresponding to the second locking ring is provided on the side pressure ring.

[0014] As a further description of the above technical solution: an extension side piece is provided on one side of the receiving half ring, and the extension side piece is attached to the inner wall of the other receiving half ring.

[0015] As a further description of the above technical solution: a first spring is provided between the outer locking sleeve and the female head.

[0016] In the above technical solution, the present invention provides a hydraulic system based on alloy die casting. When the hydraulic pump is started, the oil first flows to the hose connected by the quick-connect fitting. However, at this time, there is still oil in the hose. When pushing the still oil, there will be pressure spikes in the quick-connect fitting and the hose, especially at the quick-connect fitting used for connection. For the convenience of maintenance, it is designed for quick docking, which makes it more prone to leakage under pressure spikes. At this time, the quick-connect fitting delivers oil to the return pipe under pressure spikes, thereby sharing the pressure at the quick-connect fitting and protecting the quick-connect fitting. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure provided for an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure of the oil cover plate and other components provided in an embodiment of the present invention;

[0020] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 This is a schematic diagram of the structure of the diverter block and quick-connect connector provided in an embodiment of the present invention;

[0022] Figure 5 This is a schematic diagram of the structure of the quick-connect connector provided in an embodiment of the present invention;

[0023] Figure 6 This is a schematic cross-sectional view of the quick-connect connector provided in an embodiment of the present invention;

[0024] Figure 7 This is a schematic cross-sectional view of the quick-connect connector provided in an embodiment of the present invention from another angle;

[0025] Figure 8 for Figure 7 Enlarged view of point B in the middle;

[0026] Figure 9 for Figure 7 Enlarged view of point C in the middle;

[0027] Figure 10 This is an exploded view of the structure of the quick-connect connector provided in an embodiment of the present invention;

[0028] Figure 11 for Figure 10 Enlarged diagram of point D in the middle.

[0029] Explanation of reference numerals in the attached figures:

[0030] 1. Hydraulic pump; 10. Return pipe; 11. Diverter block; 12. Oil cover plate; 121. Sealing screw; 13. Oil tank; 14. Filter; 2. Quick-connect connector; 20. Side plate; 201. Flow hole; 202. Side end face; 21. Female head; 210. Locking end; 22. Female head; 220. Receiving groove; 221. Slot; 23. Hose connector; 24. Outer locking sleeve; 241. First spring; 25. Side pressure ring; 251. Second spring; 252. Extension block; 26. Second locking ring; 261. Third spring; 28. Sealing head; 281. Fourth spring; 3. Pressure relief mechanism; 31. Receiving half ring; 32. Extension side plate; 33. Liquid outlet pipe. Detailed Implementation

[0031] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] Please see Figure 1-11 This invention provides a technical solution: a hydraulic system based on alloy die casting, comprising a hydraulic cylinder, a solenoid valve, a hydraulic pump 1, and an oil tank 13 connected by a quick-connect fitting 2 and a hose to form a hydraulic circuit. It also includes a return pipe 10 disposed on the oil tank 13, which receives oil from the hydraulic circuit. The returned oil is cooled by passing through the ribs of the oil tank 13. An oil cover plate 12 is disposed on the oil tank 13. The hydraulic pump 1 is fixedly connected to the oil cover plate 12 by screws. A sealing screw 121 is threaded onto the oil cover plate 12 for oil changing and observing the oil condition. A filter 14 is disposed at the input end of the hydraulic pump 1 to filter the oil entering the hydraulic pump 1, preventing metal debris from entering the hydraulic oil. In the circuit, the output end of the hydraulic pump 1 is equipped with a flow divider block 11, and the quick-connect connector 2 is connected to the flow divider block 11 to divide the hydraulic oil circuits into different channels. The quick-connect connector 2 has a flow divider port, which is connected to the return pipe 10. When the hydraulic pump 1 starts, the oil first flows from the flow divider block 11 to the hose connected to the quick-connect connector 2. However, at this time, there is still oil in the hose. When pushing the still oil, there will be pressure spikes in the quick-connect connector 2 and the hose, especially at the quick-connect connector 2 used for connection. For the convenience of maintenance, it is designed for quick docking, which makes it more prone to leakage under pressure spikes. At this time, the quick-connect connector 2 supplies oil to the return pipe 10 under pressure spikes, thereby sharing the pressure at the quick-connect connector 2 and protecting the quick-connect connector 2.

[0033] In one embodiment of the present invention, the quick-connect connector 2 includes a male connector 21 and a female connector 22. Both the male connector 21 and the female connector 22 are threadedly connected to a hose connector 23, which is made of metal. Both the male connector 21 and the female connector 22 have side plates 20, each with a flow hole 201 for oil flow. Two sealing heads 28 are slidably connected to the side plates 20 along their axial direction. A fourth spring 281 is provided between the sealing heads 28 and the side plates 20. Both the male connector 21 and the female connector 22 have side end faces 202. The fourth spring 281 pushes the sealing heads 28 to conform to the side end faces 202, sealing the male connector 21 and the female connector 22. During connection, as... Figure 7 As shown, the two sealing heads 28 push against each other to compress the fourth spring 281, causing the two sealing heads 28 to move away from their respective side end faces 202 and open the oil passage.

[0034] Preferably, the female head 22 working end (the working end is...) Figure 10 For reference, at the lower end, an outer locking sleeve 24 is slidably connected. The outer locking sleeve 24 can slide along the outer surface of the female head 22 toward the male head 21. The male head 21 is provided with a locking end 210, on which steel balls 200 are arranged in a circumferential array. The outer locking sleeve 24 is provided with a locking ring groove for mating with the steel balls 200. Figure 8 , Figure 9 As shown, after connecting the male head 21 and the female head 22, the outer locking sleeve 24 slides along the female head 22 to engage the locking ring groove with the steel ball 200 to fix the male head 21 and the female head 22. The male head 21 and the female head 22 will cover the mating surfaces of the male head 21 and the female head 22 to prevent leakage. At this time, the diversion port on the quick-connect connector 2 is not open and cannot supply oil to the return pipe 10. It only serves the function of docking and is suitable for parts with low pressure. Quick docking facilitates disassembly and installation and speeds up the maintenance time of the hydraulic circuit.

[0035] Preferably, the female head 22 is provided with a base that is interference-fitted with the outer locking sleeve 24. A first spring 241 is provided between the outer locking sleeve 24 and the base. The locking ring groove of the outer locking sleeve 24 is provided with an inclined surface. The inclined surface facilitates the coupling of the steel ball 200 and the locking ring groove. The first spring 241 pushes against the outer locking sleeve 24 to maintain the pushing force between the steel ball 200 and the locking ring groove on the outer locking sleeve 24, and prevents the steel ball 200 from falling out of the locking ring groove.

[0036] In another embodiment of the present invention, a pressure relief mechanism 3 is also included, which includes two receiving half-rings 31. Each receiving half-ring 31 covers an area of ​​180°, and the two receiving half-rings 31 form an annular shape. One of the receiving half-rings 31 is provided with an outlet pipe 33 that is connected to the return pipe 10 through a hose. The mating surface between the male head 21 and the female head 22 of the two annular receiving half-rings 31 is used to allow oil to overflow into the receiving half-ring 31 along the mating surface between the male head 21 and the female head 22 when a pressure spike occurs, so as to supply oil to the return pipe 10, thereby playing a role in pressure relief and overload protection, guiding pressure release, and protecting the male head 21, the female head 22, and the hose.

[0037] Preferably, the receiving half-ring 31 is provided with steel balls 200 and locking ring grooves at both ends, such as Figure 8 and Figure 9 As shown, the two ends of the receiving half ring 31 are respectively snapped onto the locking end 210 on the male head 21 and the outer locking sleeve 24 on the female head 22. The receiving half ring 31 is fixed by the locking end 210 and the outer locking sleeve 24 for quick docking. At the same time, the outer locking sleeve 24 is snapped onto the base through interference fit to fix the position of the outer locking sleeve 24.

[0038] Preferably, one side of each of the two receiving half-rings 31 is provided with an extension side piece 32. During installation, both extension side pieces 32 are attached to the inner wall of the other receiving half-ring 31 to cover the joint of the two receiving half-rings 31, reducing the chance of leakage. After the two receiving half-rings 31 are fixed by the locking end 210 and the outer locking sleeve 24 respectively, the extension side pieces 32 can also play a locking role to prevent the two receiving half-rings 31 from loosening.

[0039] In the preferred embodiment of the present invention, a receiving groove 220 is provided on the mating surface of the female head 22, and the side pressure ring 25 is slidably connected in the receiving groove 220. A second spring 251 is provided on both of them. The side pressure ring 25 and the female head 21 are provided with a pressure relief chamfer along the axial direction. The side pressure ring 25 is driven to fit against the working surface of the female head 21, and a pressure relief layer is formed between them. When the oil passes through the pressure relief layer, it enters the pressure relief layer through the small diameter pipe to relieve pressure. When it re-enters the small diameter pipe, the pressure needs to increase. When the pressure is large, the oil squeezes through the pushing force of the second spring 251 along the pressure relief chamfer and enters the receiving half ring 31 to release the oil.

[0040] Preferably, the outer surface of the female head 22 is slidably connected with a second locking ring 26 that can move in the axial direction. When the receiving half ring 31 is not installed, the second locking ring 26 pushes and locks the side pressure ring 25 along with the outer locking sleeve 24. At this time, the side pressure ring 25 is pushed by the second spring 251 and the second locking ring 26, which plays a better locking role. When the receiving half ring 31 is installed, the pushing force of the second locking ring 26 on the side pressure ring 25 disappears, and the side pressure ring 25 can release pressure normally.

[0041] Preferably, a third spring 261 is provided between the second locking ring 26 and the outer locking sleeve 24. When the receiving half ring 31 is not installed, the outer locking sleeve 24 needs to move to fit the locking end 210. When moving, it pushes against the third spring 261 to compress it, thereby increasing the pushing force of the third spring 261 on the second locking ring 26. The side pressure ring 25 is provided with an extension block 252 corresponding to the second locking ring 26. The female head 22 is provided with a slot 221 for the extension block 252 to slide. The second locking ring 26 pushes against the side pressure ring 25 through the extension block 252. When the receiving half ring 31 is installed, the outer locking sleeve 24 is locked onto the base. At this time, the movement range of the outer locking sleeve 24 is limited by the receiving half ring 31. At this time, the third spring 261 is not compressed, thereby ensuring that the side pressure ring 25 can release pressure normally.

[0042] When pressure relief is not required and only the function of quick docking is needed, the mating surfaces of the male head 21 and the female head 22 are brought together. At this time, the two sealing heads 28 push against each other to compress the fourth spring 281, causing the two sealing heads 28 to move away from their respective side end faces 202 and open the oil passage. Then, the outer locking sleeve 24 slides along the female head 22 to engage the locking ring groove with the steel ball 200 to fix the male head 21 and the female head 22. At this time, the side pressure ring 25 is pushed by the second spring 251 and the second locking ring 26, which provides a better locking effect.

[0043] In environments requiring pressure relief, the outer locking sleeve 24 is slidably snapped onto the base along the female head 22. At this time, the two receiving half rings 31 are closed and snapped onto the locking end 210, and the closed receiving half rings 31 are snapped onto the outer locking sleeve 24 to complete the installation. At this time, the movement range of the outer locking sleeve 24 is limited by the receiving half rings 31. At this time, the third spring 261 is not compressed, thereby ensuring that the side pressure ring 25 can properly relieve pressure.

[0044] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A hydraulic system based on alloy die casting, comprising a hydraulic cylinder, a solenoid valve, a hydraulic pump (1), and an oil tank (13), characterized in that, It also includes a return pipe (10) installed on the oil tank (13), and a quick-connect connector (2) is connected between the output end of the hydraulic pump (1) and the hydraulic cylinder. The quick-connect connector (2) is connected to the return pipe (10), and the quick-connect connector (2) supplies oil to the return pipe (10) under pressure peak. The quick-connect connector (2) includes a female connector (21) and a female connector (22), both of which are provided with movable sealing heads (28) and side end faces (202). The sealing heads (28) are fitted to the side end faces (202) to seal, and the two sealing heads (28) push against each other to open. It also includes a pressure relief mechanism (3), which includes a clamp on the quick-connect connector (2) to receive a half ring (31), the receiving half ring (31) being connected to the return pipe (10), and the male head (21) and the female head (22) supplying oil to the receiving half ring (31) under pressure peaks; The working end of the female head (22) is movably provided with an outer locking sleeve (24), and the female head (21) is provided with steel balls (200) arranged in a circular array. The outer locking sleeve (24) is provided with a locking ring groove for docking with the steel balls (200). The receiving half ring (31) is provided with steel balls (200) and locking ring grooves at both ends, so that the two ends of the receiving half ring (31) are respectively engaged with the male head (21) and the female head (22).

2. The hydraulic system based on alloy die casting according to claim 1, characterized in that, A side pressure ring (25) is movably disposed on the female head (22). The side pressure ring (25) is driven to fit against the working surface of the female head (21), and a pressure relief layer is formed between them. The side pressure ring (25) and the female head (21) are provided with pressure relief chamfers along the axial direction.

3. A hydraulic system based on alloy die casting according to claim 2, characterized in that, Two locking rings (26) are slidably connected to the female head (22). The two locking rings (26) move with the outer locking sleeve (24) to lock or unlock the side pressure ring (25).

4. A hydraulic system based on alloy die casting according to claim 3, characterized in that, A third spring (261) is provided between the second locking ring (26) and the outer locking sleeve (24), and an extension block (252) corresponding to the second locking ring (26) is provided on the side pressure ring (25).

5. A hydraulic system based on alloy die casting according to claim 1, characterized in that, An extension side piece (32) is provided on one side of the receiving half ring (31), and the extension side piece (32) is attached to the inner wall of the other receiving half ring (31).

6. A hydraulic system based on alloy die casting according to claim 1, characterized in that, A first spring (241) is provided between the outer locking sleeve (24) and the female head (22).

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