Linkage mechanism for ejector core and mold opening and closing for core box mold

Abstract

The invention relates to a linkage mechanism for core pulling and ejecting and die opening and closing of a core shooting box die, which is characterized in that the linkage mechanism comprises a push plate which is pushed by an oil cylinder and on which the lower end of a core ejecting rod is fixed; two guide rods which are arranged parallelly with an interval and have lower ends fixed on the push plate; a left push rod connected with a left core-pulling part, a right push rod connected with a right core-pulling part, and a rear push rod connected with a rear core-pulling part, wherein the push rods are sleeved with springs for maintaining the push rods to be in an outward moving state; a left driving cam, a right driving cam and a rear driving cam which are rotatably disposed on a lower die holder, wherein the outer ends of the push rods are abutted against the circumferential surfacesof the driving cams, the left driving cam is connected with the rear driving cam through a connecting rod, the right driving cam is also connected with the rear driving cam through a connecting rod, and the push plate is connected with the rear driving cam through a transmission structure. The linkage mechanism of the invention adopts only one hydraulic cylinder as a driving element, completes actions of core pulling, core ejecting, and die opening smoothly without stopping, saves hydraulic cylinders, reduces energy consumption, and simplifies electrical control.

Description

technical field [0001] The present invention relates to a large and medium-sized integral core-shooting box mold, in particular to a linkage mechanism for ejecting cores and opening and closing molds of a core-shooting box mold. box mold. Background technique [0002] Existing products that use core box molds to make cores all have complex shapes and porous structures, especially involving the overall core box mold of the central guide frame of the side frame of a railway vehicle. For example, a Chinese utility model patent "A Kind of Integral Core Shooting Box Mold for the Central Guide Frame of Railway Vehicle Side Frame" with the patent number ZL200920308283.0 (authorized announcement number CN 201470833U) discloses such an integral core shooting for the central pedestal frame of the railway vehicle side frame. box mold. Including mold frame group, core box, sand shooting board, air blowing board and core ejector mechanism. The core box body includes upper and lower cor...

AI Technical Summary

Problems solved by technology

[0003] Existing core-shooting box mold equipment has fewer options for core-pulling directions. Generally, it can only provide core-pulling in the front and rear directions at the same time, and cannot provide core-pulling force in the left-right direction. If core-pulling in other (left-right) directions requires Additional installation of oil cylinder to assist core pulling

The use of oil cylinders to achieve core pulling in other (left and right) directions has the following defects: 1. The oil cylinder is expensive, and it is necessary to connect and install the device in the mold design, such as increasing the oil cylinder installation frame, increasing the design difficulty of the mold, increasing the design cost, and increasing 2. The core-pulling mechanism is completely independent from the mold opening and closing structure, which will cause the oil cylinder to be out of sync with the core-pulling during the mold opening process, resulting in mold damage and oil leakage from the oil cylinder resulting in 3. The core pulling force provided by the oil cylinder is not easy to be consistent, resulting in inconsistent core pulling speed. The sand core on one side is broken; 4. Long-term use of the oil cylinder will lead to poor sealing of the oil cylinder, resulting in oil leakage and oil pollution entering the sand shooting machine, thereby affecting the overall quality of the sand core; 5. It is inconvenient to disassemble and replace the auxiliary oil cylinder device; 6. Auxiliary cylinders will be subject to great environmental factors, resulting in decreased accuracy, insensitive operation, and a waste of time

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