JPH0266846U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a hydraulic circuit diagram of a chuck device for a vibrohammer according to an embodiment of the present invention. FIG. 2 is a sectional view showing details of the pressure increasing cylinder and the device for detecting the end of its stroke in this embodiment. FIG. 3 is a circuit diagram of the operation and display section of the chuck device in this embodiment. FIG. 4 is a diagram showing the relationship between pressure and time during the chuck closing operation in this embodiment. FIG. 5 is a diagram showing the relationship between pressure and time during block operation in this embodiment. 6th
The figure is a front view of the chuck device. FIG. 7 shows a conventional chuck hydraulic circuit. FIG. 8 is a diagram showing the relationship between pressure and time in a conventional chuck hydraulic circuit. 1: Chuck body, 3, 11: Chuck claw, 5
: Opening/closing cylinder, 10: Chuck block, 2
1, 32: Hydraulic pump, 22: Electromagnetic directional valve, 23, 24, 37: Pilot operation check valve, 25: Accumulator, 26, 33: Relief valve, 31: Pressure increase cylinder, 31b: Low pressure chamber, 31
c: High pressure chamber, 34: Pressure switch (pressure detection means), 36: Accumulator, 38: Proximity switch (stroke detection means), 39, 40: Push button switch, 41: Latch relay, 43: Lamp, 4
4: Buzzer.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A chuck claw for grasping an object to be grasped, an opening/closing cylinder for opening and closing the chuck claw, and a direction switching means for switching the direction of hydraulic pressure supplied to the opening/closing cylinder. In the chuck device of the vibro hammer, the chuck device for the vibro hammer is configured to block the opening/closing cylinder by the direction switching means when gripping the object to be gripped, wherein high pressure is applied to the cylinder chamber of the opening/closing cylinder which is on the high pressure side when the opening/closing cylinder is blocked. a pressure booster cylinder to which the chamber is connected; a hydraulic source connected to the low pressure chamber of the pressure booster cylinder to maintain the low pressure chamber at a predetermined pressure; and a hydraulic source connected to the low pressure chamber of the pressure booster cylinder to maintain the pressure of the hydraulic source. A chuck device for a vibratory hammer, comprising: an accumulator that compensates for the pressure in the low pressure chamber even if the pressure decreases. (2) It comprises a pressure detection means for detecting the pressure in the high pressure chamber of the pressure boosting cylinder, and an alarm means for issuing an alarm when the pressure detection means detects that the pressure in the high pressure chamber has decreased to a predetermined value. A chuck device for a vibrohammer according to claim 1. (3) Stroke detection means for detecting the stroke position of the piston rod of the pressure increase cylinder; and an alarm that issues an alarm when the stroke detection means detects that the stroke amount of the piston rod of the pressure increase cylinder exceeds a predetermined value. A chuck device for a vibrohammer according to claim 1, comprising means. (4) pressure detection means for detecting the pressure in the high pressure chamber of the pressure increase cylinder; stroke detection means for detecting the stroke position of the piston rod of the pressure increase cylinder; and the pressure detection means reduces the pressure in the high pressure chamber to a predetermined value. 2. The chuck device for a vibro hammer according to claim 1, further comprising an alarm means for issuing an alarm when the stroke amount of the piston rod of the pressure boosting cylinder is detected by the stroke detection means to exceed a predetermined value.