Hydraulic drive for a die casting machine

Abstract

The utility model provides a kind of hydraulic drive device of die casting machine, belong to hydraulic drive device technical field, including hydraulic cylinder, the one side outer wall central position of hydraulic cylinder is provided with piston post sleeve, the end embedding setting of piston post sleeve away from hydraulic cylinder is provided with piston post, hydraulic drive self-locking assembly is arranged on the piston post sleeve and piston post;The hydraulic drive self-locking assembly includes embedding and being provided in the fixed bevel gear of piston post outer periphery, the outer periphery of piston post sleeve is provided with fixed frame, the inside bottom of fixed frame is provided with driving sleeve;The utility model is formed by fixed bevel gear and movable bevel gear cooperation after tooth-like one-way movement limiting structure, to limit support after the piston post of one-way movement, realize piston post self-locking, so that when hydraulic system appears leakage, piston post can still keep this position, avoid piston post reset unloading force to cause metal casting liquid in mould to leak.

Description

Technical Field

[0001] This utility model belongs to the technical field of hydraulic drive devices, specifically relating to a hydraulic drive device for a die-casting machine. Background Technology

[0002] Die casting machines are used for pressure casting. They inject molten metal into a mold under high pressure to cool and solidify it. During die casting operations, the die casting machine requires a hydraulic drive device to open and close the mold, thereby achieving workpiece forming and demolding.

[0003] When the existing hydraulic drive device drives the die-casting machine to complete the mold closing operation, the hydraulic system is under high pressure, which poses a safety failure problem. There is a lack of effective structure to restrict the hydraulic drive end. Therefore, if the hydraulic system fails during the mold closing support, it will cause the hydraulic drive end to move, thereby losing the support effect and easily causing molten metal leakage, which poses certain safety hazards.

[0004] Therefore, a hydraulic drive device for a die-casting machine is proposed. Summary of the Invention

[0005] This utility model provides a hydraulic drive device for a die-casting machine, the purpose of which is to solve the problems mentioned above.

[0006] This utility model provides a hydraulic drive device for a die-casting machine, including a hydraulic cylinder. A piston sleeve is disposed at the center of one outer wall of the hydraulic cylinder, and a piston rod is embedded in the piston sleeve at one end away from the hydraulic cylinder. A hydraulic drive self-locking assembly is disposed on the piston sleeve and the piston rod. The hydraulic drive self-locking assembly includes a fixed bevel tooth embedded in the outer circumferential surface of the piston rod. A fixing frame is disposed on the outer circumferential surface of the piston sleeve, and a drive sleeve is disposed at the bottom of the fixing frame. A drive mechanism is embedded in the center of the top of the drive sleeve. The drive column has a vertical lifting frame at its top, a spring between its bottom and the top of the drive sleeve, a second vertical lifting frame and a horizontal moving cover slidably connected to the inner wall of the fixed frame, the second vertical lifting frame being located below the horizontal moving cover, and a linkage rod movably connected between the second vertical lifting frame and the first vertical lifting frame, a second spring between one outer wall of the horizontal moving cover and one inner wall of the fixed frame, and a rotating platform rotatably connected to the inner wall of the horizontal moving cover, with a movable bevel tooth on one side of the rotating platform.

[0007] Furthermore, an external hydraulic pump is provided at the bottom of the fixed frame, and an oil inlet pipe is provided at the output end of the external hydraulic pump. The oil inlet pipe is connected and fixed to the drive sleeve. A hydraulic oil pressure sensor is embedded on one side of the outer wall of the hydraulic cylinder, and a hydraulic pipe is provided on the outer circumferential surface of the hydraulic cylinder.

[0008] Furthermore, the second vertical lifting frame and the first vertical lifting frame are rotatably connected to both ends of the linkage rod, respectively;

[0009] By adopting the above technical solution, the two ends of the linkage rod can rotate inside the vertical lifting frame 2 and the vertical lifting frame 1, thereby changing the tilt angle of the linkage rod between the vertical lifting frame 2 and the vertical lifting frame 1, and achieving the purpose of linkage.

[0010] Furthermore, one end of the piston rod performs piston-like movement inside the piston rod sleeve, and a flange is provided at one end of the piston rod;

[0011] By adopting the above technical solution, the flange is used to facilitate the connection between the piston rod and the moving mold on the die-casting machine, thereby enabling the moving mold to move and realize mold closing and opening operations.

[0012] Furthermore, parallel inclined surfaces are provided on the side walls of both the fixed bevel teeth and the movable bevel teeth facing each other, and the fixed bevel teeth and the movable bevel teeth are engaged and locked together.

[0013] By adopting the above technical solution, the fixed bevel teeth on the piston rod can push the movable bevel teeth to move when the piston rod is in linear motion. By using the meshing snap-fit ​​structure, the fixed bevel teeth and the movable bevel teeth form a one-way motion limiting structure, thereby limiting and supporting the piston rod after the one-way motion and realizing the self-locking of the piston rod.

[0014] Furthermore, the sliding directions of the horizontally moving cover and the vertical lifting frame are perpendicular to each other;

[0015] By adopting the above technical solution, the horizontal moving cover can move horizontally in a straight line, and the vertical lifting frame can move vertically in a straight line.

[0016] Furthermore, the input end of the external hydraulic pump is connected to an external oil tank;

[0017] By adopting the above technical solution, and using an external oil tank as an independent storage structure, independent hydraulic power can be provided for the drive sleeve, thereby controlling the unlocking of the piston rod after self-locking.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. This utility model uses a lifting frame that fits against the bottom of a horizontally moving cover to limit the rotation of the rotating platform inside the cover, preventing it from rotating. The fixed and movable bevel teeth work together to form a unidirectional movement limiting structure, thereby limiting and supporting the piston rod after unidirectional movement. This achieves piston rod self-locking, ensuring that the piston rod remains in this position even if there is a leak in the hydraulic system, preventing the piston rod from resetting and releasing force, which could cause leakage of molten metal in the mold.

[0020] 2. This utility model forms an independent hydraulic system through the oil inlet pipe and the external hydraulic pump, so that the self-locking structure and the unlocking structure are not affected by the original hydraulic system, and the piston column can be controlled to unlock, thereby allowing the piston column to perform a reset movement, thus realizing the mold opening on the die casting machine.

[0021] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures particularly pointed out in the description and the drawings. Attached Figure Description

[0022] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0023] Figure 1 This is a schematic diagram of the structure of an embodiment of the present utility model;

[0024] Figure 2 This is a three-dimensional cross-sectional view of an embodiment of the present utility model;

[0025] Figure 3 This is a schematic diagram of the piston column structure according to an embodiment of the present utility model;

[0026] Figure 4 This is a schematic diagram of the fixing frame structure according to an embodiment of the present utility model;

[0027] Figure 5 This is a schematic diagram of the linkage structure of an embodiment of the present utility model;

[0028] Figure 6 This is a schematic diagram of the horizontally moving cover structure according to an embodiment of the present utility model;

[0029] Figure 7 This is an embodiment of the present utility model. Figure 4 Enlarged diagram of point A in the diagram;

[0030] Reference numerals: 1. Hydraulic cylinder; 2. Piston sleeve; 3. Piston rod; 4. Hydraulic drive self-locking assembly; 41. Fixed bevel gear; 42. Fixed frame; 43. Drive sleeve; 431. Drive column; 432. Vertical lifting frame one; 433. Spring one; 44. Vertical lifting frame two; 45. Linkage rod; 46. Horizontal moving cover; 461. Spring two; 462. Rotating table; 463. Movable bevel gear; 5. External hydraulic pump; 6. Oil inlet pipe; 7. Hydraulic oil pressure sensor; 8. Hydraulic pipeline. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0032] Example 1

[0033] Reference Figure 1-7 This utility model embodiment proposes a hydraulic drive device for a die casting machine, including a hydraulic cylinder 1. A piston sleeve 2 is provided at the center of one side outer wall of the hydraulic cylinder 1. A piston 3 is embedded in the piston sleeve 2 at the end away from the hydraulic cylinder 1. One end of the piston 3 performs piston-like movement inside the piston sleeve 2, and a flange is provided at one end of the piston 3. The flange facilitates the connection between the piston 3 and the moving mold on the die casting machine, thereby pulling the moving mold to realize mold closing and mold opening operations. A hydraulic drive self-locking component 4 is provided on the piston sleeve 2 and the piston 3.

[0034] The hydraulically driven self-locking assembly 4 includes a fixed bevel tooth 41 embedded in the outer circumferential surface of the piston rod 3, a fixed frame 42 on the outer circumferential surface of the piston rod sleeve 2, a drive sleeve 43 at the bottom of the fixed frame 42, a drive column 431 embedded in the center of the top of the drive sleeve 43, a vertical lifting frame 432 at the top of the drive column 431, a spring 433 between the bottom of the vertical lifting frame 432 and the top of the drive sleeve 43, a second vertical lifting frame 44 and a horizontal moving cover 46 slidably connected to the inner side wall of the fixed frame 42, the sliding directions of the horizontal moving cover 46 and the second vertical lifting frame 44 being perpendicular, allowing the horizontal moving cover 46 to move horizontally and the second vertical lifting frame 44 to move vertically, the second vertical lifting frame 44 being located below the horizontal moving cover 46, and a linkage rod 45 movably connecting the second vertical lifting frame 44 and the first vertical lifting frame 432, the second vertical lifting frame 44 and the first vertical lifting frame 432 being rotatably connected to the two ends of the linkage rod 45 respectively, allowing... This causes both ends of the linkage rod 45 to rotate inside the vertical lifting frame 44 and the vertical lifting frame 432, thereby changing the tilt angle of the linkage rod 45 between the vertical lifting frame 44 and the vertical lifting frame 432 to achieve the purpose of linkage. A spring 461 is provided between an outer wall of the horizontal moving cover 46 and an inner wall of the fixed frame 42, and a rotating platform 462 is rotatably connected to the inner wall of the horizontal moving cover 46. A movable bevel tooth 463 is provided on one side of the rotating platform 462, and a fixed bevel tooth 463 is provided on the inner wall of the horizontal moving cover 46. Parallel inclined surfaces are provided on the side walls of the fixed bevel tooth 41 and the movable bevel tooth 463 facing each other. The fixed bevel tooth 41 and the movable bevel tooth 463 are engaged and locked together, so that when the fixed bevel tooth 41 on the piston rod 3 moves in a straight line, the fixed bevel tooth 41 can push the movable bevel tooth 463 to move. The engaging and locking structure makes the fixed bevel tooth 41 and the movable bevel tooth 463 form a one-way movement limiting structure, thereby limiting and supporting the piston rod 3 after one-way movement, and realizing the self-locking of the piston rod 3.

[0035] Specifically, when the die-casting machine performs hydraulic mold closing operation, the drive sleeve 43 is connected to the hydraulic cylinder 1 through a pipeline. Hydraulic oil enters the hydraulic cylinder 1, increasing the hydraulic oil pressure. A portion of the hydraulic oil enters the drive sleeve 43. Under the hydraulic pressure, the drive column 431 is pushed, causing a portion of it to push out of the drive sleeve 43. The drive column 431 pushes the vertical lifting frame 432 to move vertically. Under the linkage of the linkage rod 45, one end of the linkage rod 45 pulls the vertical lifting frame 44 to move vertically until the vertical lifting frame 44 is in contact with the horizontal moving... At the bottom of the cover 46, the rotating platform 462 inside the horizontally moving cover 46 is limited and cannot rotate. Under the action of the hydraulic oil pressure in the hydraulic cylinder 1, the piston rod 3 is pushed. The moving mold connected to one end of the piston rod 3 is pushed to move in order to perform the mold closing operation. As the piston rod 3 moves linearly, the fixed bevel tooth 41 on the piston rod 3 contacts the movable bevel tooth 463. Under the action of pressure, the movable bevel tooth 463, the rotating platform 462 and the horizontally moving cover 46 are pushed. The horizontally moving cover 46 moves away from the piston rod 3, and the spring 461 is compressed.

[0036] After the mold closing operation is completed, the piston rod 3 stops moving. Under the rebound force of the spring 461, the movable bevel tooth 463 is always in the state of engaging with the fixed bevel tooth 41. The movable bevel tooth 463 limits the fixed bevel tooth 41, thereby realizing the self-locking of the piston rod 3. When the hydraulic system leaks, the piston rod 3 can still maintain this position, avoiding the leakage of molten metal in the mold caused by the piston rod 3 resetting and unloading the force.

[0037] Example 2

[0038] Reference Figure 1 and Figure 4 Based on the above embodiments, this utility model embodiment also proposes a hydraulic drive device for a die casting machine, including a hydraulic cylinder 1, a piston sleeve 2 is provided at the center of one side outer wall of the hydraulic cylinder 1, a fixing frame 42 is provided on the outer circumferential surface of the piston sleeve 2, an external hydraulic pump 5 is provided at the bottom of the fixing frame 42, the input end of the external hydraulic pump 5 is connected to an external oil tank, and the external oil tank serves as an independent storage structure to provide independent hydraulic power to the drive sleeve 43, thereby controlling the unlocking of the piston 3 after self-locking, an oil inlet pipe 6 is provided at the output end of the external hydraulic pump 5, the oil inlet pipe 6 is connected and fixed to the drive sleeve 43, a hydraulic oil pressure sensor 7 is embedded on one side outer wall of the hydraulic cylinder 1, the hydraulic oil pressure sensor 7 adopts an MPM388 type pressure sensor, and a hydraulic pipe 8 is provided on the outer circumferential surface of the hydraulic cylinder 1;

[0039] Specifically, the oil inlet pipe 6 and the external hydraulic pump 5 are used to replace the pipe used to connect the drive sleeve 43 and the hydraulic cylinder 1 in Embodiment 1. When the piston column 3 is unlocked, the external hydraulic pump 5 is used to extract the hydraulic oil from the drive sleeve 43. Under the action of the return force of the spring 433, the spring 433 pulls the vertical lifting frame 432 to reset. Under the connection of the linkage rod 45, one end of the linkage rod 45 pulls the vertical lifting frame 44 to move. The vertical lifting frame 44 separates from the horizontal moving cover 46. After the rotating platform 462 inside the horizontal moving cover 46 loses its limit, when the piston column 3 resets, the fixed bevel tooth 41 on the piston column 3 pulls the horizontal moving cover 46 to move linearly and the rotating platform 462 to rotate. The movable bevel tooth 463 on the rotating platform 462 disengages from the fixed bevel tooth 41. At this time, the piston column 3 can reset, thereby realizing the mold opening on the die casting machine.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A hydraulic drive device for a die-casting machine, characterized in that: Includes a hydraulic cylinder (1), a piston sleeve (2) is provided at the center of one side outer wall of the hydraulic cylinder (1), a piston rod (3) is embedded on the piston sleeve (2) away from the hydraulic cylinder (1), and a hydraulically driven self-locking assembly (4) is provided on the piston sleeve (2) and the piston rod (3). The hydraulically driven self-locking assembly (4) includes a fixed bevel tooth (41) embedded in the outer peripheral surface of the piston rod (3). A fixed frame (42) is provided on the outer peripheral surface of the piston rod sleeve (2). A drive sleeve (43) is provided at the bottom of the fixed frame (42). A drive rod (431) is embedded at the top center of the drive sleeve (43). A vertical lifting frame (432) is provided at the top of the drive rod (431). A spring (433) is provided between the bottom of the vertical lifting frame (432) and the top of the drive sleeve (43). The fixed frame (42) A vertical lifting frame two (44) and a horizontal moving cover (46) are slidably connected on the inner side wall of the horizontal moving cover (46). The vertical lifting frame two (44) is located below the horizontal moving cover (46), and a linkage rod (45) is movably connected between the vertical lifting frame two (44) and the vertical lifting frame one (432). A spring two (461) is provided between an outer side wall of the horizontal moving cover (46) and an inner side wall of the fixed frame (42). A rotating platform (462) is rotatably connected on the inner side wall of the horizontal moving cover (46), and a movable bevel tooth (463) is provided on one side end of the rotating platform (462).

2. The hydraulic drive device for a die-casting machine according to claim 1, characterized in that: An external hydraulic pump (5) is provided at the bottom of the fixed frame (42). An oil inlet pipe (6) is provided at the output end of the external hydraulic pump (5). The oil inlet pipe (6) is connected to and fixed to the drive sleeve (43). A hydraulic oil pressure sensor (7) is embedded on one side of the outer wall of the hydraulic cylinder (1), and a hydraulic pipe (8) is provided on the outer circumferential surface of the hydraulic cylinder (1).

3. The hydraulic drive device for a die-casting machine according to claim 1, characterized in that: The vertical lifting frame two (44) and vertical lifting frame one (432) are rotatably connected to both ends of the linkage rod (45).

4. The hydraulic drive device for a die-casting machine according to claim 1, characterized in that: One end of the piston rod (3) moves in a piston-like motion inside the piston rod sleeve (2), and a flange is provided at one end of the piston rod (3).

5. The hydraulic drive device for a die-casting machine according to claim 1, characterized in that: The fixed bevel tooth (41) and the movable bevel tooth (463) have parallel inclined surfaces on their opposite side walls, and the fixed bevel tooth (41) and the movable bevel tooth (463) are engaged and locked together.

6. The hydraulic drive device for a die-casting machine according to claim 1, characterized in that: The sliding directions of the horizontal moving cover (46) and the vertical lifting frame (44) are perpendicular.

7. The hydraulic drive device for a die-casting machine according to claim 2, characterized in that: The input end of the external hydraulic pump (5) is connected to the external oil tank.

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