Accessory quick change device

Abstract

The invention discloses an accessory quick change device. The accessory quick change device comprises a fixing part, guiding parts and a locking part, wherein the fixing part is hinged to a movable arm, the guiding parts are fixedly connected with the fixing part, and the locking part locks or unlocks an accessory under the guide of the guiding parts; and the locking part comprises a locking oil cylinder, a ladder sleeve, a ladder shaft, a locking pin and an inner spring, the locking part is laid on the fixing part through an oil cylinder installation seat. According to the accessory quick change device, guiding type surface-to-surface contact is adopted to transmit force, the piston rod of the locking oil cylinder does not bear torque any more, the locking pin are capable of rotating withthe accessory, the force influence of the locking part is removed. The accessory quick change device has a simple structure, the machining accuracy of parts is low, and the locking part occupies a smaller space, overall arrangement is convenient, and the application of a hydraulic quick change device is expanded at a large scale.

Description

technical field [0001] The invention relates to a hydraulic quick-change device for construction machinery, in particular to a quick-change device for attachments, which belongs to the technical field of construction machinery. Background technique [0002] As a working tool for the whole machine, the diversity of tools can effectively broaden the scope of use of the whole machine and improve the utilization rate. In order to improve working efficiency, higher requirements are put forward for the quick replacement of tools and the reliability of connection. [0003] At present, there are two ways to replace tools, traditional manual operation and hydraulic quick change. Manual operation is mostly done by a link mechanism. Press the handle of the link mechanism, and the link will drive the two positioning pins to slide out of the machine locking hole. After replacing the machine, loosen the handle, and the connecting rod will push the two positioning pins into the machine lo...

AI Technical Summary

Problems solved by technology

Manual operation is mostly done by a link mechanism. Press the handle of the link mechanism, and the link will drive the two positioning pins to slide out of the machine locking hole. After replacing the machine, loosen the handle, and the connecting rod will push the two positioning pins into the machine locking hole. This method requires at least two people to complete the tool replacement, which has low operating efficiency, high labor intensity, and requires the cooperation of lifting tools.

Hydraulic quick change: One method is an improvement on the basis of manual operation, using an oil cylinder instead of manual power to complete the action of the connecting rod mechanism. This method has a small specification of the oil cylinder and requires special customization, which is difficult to process and has poor reliability in the movement of the mechanism. ;Another way is to use the hydraulic cylinder to drive the locking pin to lock the machine tool. This method requires precise positioning of the hydraulic cylinder piston rod and the locking pin. Common hydraulic cylinders cannot meet the positioning requirements, and the scrap rate is extremely high, and the hydraulic cylinder bears attachments. The torque transmitted by the movement seriously affects the service life and reliability

In the follow-up improvement design, a connecting block with a T-shaped groove is added in the middle of the piston rod of the hydraulic cylinder and the locking pin. In this way, the parts and components are mostly irregular-shaped parts, which is difficult to manufacture, high in cost, and takes up a lot of space.

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