Hydraulic locking device of pressure machine

Abstract

The invention discloses a hydraulic locking device of a pressure machine. The hydraulic locking device of the pressure machine comprises a connecting rod with a stepped hole, a locknut installed on the stepped hole, and a screw located in the stepped hole, the screw can stretch out of the stepped hole in the length direction, a screw ball head is formed at the stretching end of the screw and connected with a sliding block, the top plane of the locknut has a certain axial clearance relative to a step, the screw and the locknut have a certain thread clearance when screwed together, and the axial clearance is larger than the thread clearance. A seal end cover with a radial through hole is installed on the bottom end face of the connecting rod, an axial separation cavity is formed between the seal end cover and the locknut and communicated with the radial through hole, and when hydraulic oil is injected into the radial through hole and the axial separation cavity is filled with the hydraulic oil, the screwed section of the locknut and the screw rod has elastic deformation. By the adoption of the technical scheme, the thread clearance can be eliminated, the screw is high in movement precision and long in service life, the precision of the sliding block moving to a bottom dead centre working position is improved, and therefore a stamped workpiece has high quality and precision.

Description

【Technical field】 [0001] The invention relates to a hydraulic locking device of a press, belonging to the technical field of press locking. 【Background technique】 [0002] Such as figure 1 Shown, the locking device of existing press comprises connecting rod 1 ', screw rod 2 ' and screw sleeve 3 ', and screw rod 2 ' and screw sleeve 3 ' are all located in the stepped hole 10 ' of connecting rod 1 '. Among them, the screw sleeve 3' is fixed in the stepped hole 10' through the pressure plate H', the screw sleeve 3' and the screw rod 2' are screwed together through internal and external threads, and the end of the screw rod 2' protruding from the stepped hole 10' forms a A screw ball head 21', the screw ball head 21' is connected to the slider 5'. [0003] Slider 5' up and down reciprocating process is as follows: [0004] When the press is working, the movement of the known crankshaft and connecting rod mechanism makes the connecting rod 1' drive the screw ball head 21' to m...

AI Technical Summary

Problems solved by technology

[0004] When the press is working, the movement of the known crankshaft and connecting rod mechanism makes the connecting rod 1' drive the screw ball head 21' to move, so that the movement is transformed into the slider 5' moving up and down at the upper dead center position and the lower dead center working position, There is an objective thread gap between the screw 2' and the screw sleeve 3', which affects the accuracy of the slider 5' reaching the bottom dead point, resulting in low quality and accuracy of the stamping workpiece, and also reduces the service life of the screw 2' and the press die

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