JPS6039U - Hydraulic clamping device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

1 to 6 show a first embodiment of the present invention, FIG. 1 is a hydraulic system diagram with a hydraulic pressure supply device connected to a hydraulic clamp device, and FIG. 2 is a longitudinal side view of a directional control valve. , Fig. 3 is a partial side view thereof, Fig. 4 is a partial longitudinal sectional front view thereof, Fig. 5 is a longitudinal sectional side view of a pair of male and female self-sealing joints, and Fig. 6 is a longitudinal sectional view of a modified example of the pressure relief shutoff valve. Side view, Figures 7 to 1
Figure 0 shows a second embodiment of the present invention, Figure 7 is a hydraulic system diagram of a hydraulic clamping device, Figure 8 is a perspective view of a hydraulic clamping device, Figure 9 is a longitudinal side view of a directional control valve, FIG. 10 is a cross-sectional view taken along the line X--X. ■... Directional switching valve, 1... Support frame, 4... Hydraulic cylinder, 4a... Hydraulic oil chamber, 7a... Oil filler port, 7b
...Oil drain port, 8a/8b...Self-seal joint, 1
1a... Oil supply path, 11C... Oil path, 18... Pressure port, 20... Cylinder port, 22... Return port, 23a
, 23b...Shutoff valve.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. Hydraulic cylinder 4 in support frame 1 of hydraulic clamp device,
A directional switching valve ■, an oil supply lower a and an oil drain lower b are provided, and the hydraulic oil chamber 4a of the hydraulic cylinder 4 is connected to the cylinder port 20 of the directional switching valve ■ by an oil passage 11C, and the pressure port 18 of the directional switching valve is connected to the oil supply lower a by the oil supply path 11a, and the return port 22 is connected to the oil drain lower b by the oil drain path 11b, and the directional control valve ■ is switchable between the oil supply position and the oil drain position. The directional switching valve (■) is a poppet valve, and in its refueling position, allows flow from the pressure port 18 to the cylinder port 20 and from the return port 22 to the cylinder port 20, but is designed to prevent flow in the opposite direction. When self-sealing joints 8a and 8b with check valve materials are attached to the oil supply lower a and oil drain lower b, respectively, and the directional control valve V is in the oil supply position, the pressure in the hydraulic oil chamber 4a is Add oil to cylinder port 2
The oil passage from 0 to the oil supply lower a and the oil passage from the cylinder port 20 to the oil discharge lower b are double sealed by the poppet valve check mechanism and the check valves of the self-sealing joints 8a and 8b. A hydraulic clamping device characterized in that cutoff valves 23a and 23b for pressure relief are interposed in the oil supply passage 11a and the oil discharge passage 11a in a branched manner, respectively. 2 Scope of Claims for Utility Model Registration In the hydraulic clamping device described in paragraph 1, the hydraulic clamping device C is a vertical NC.
A workpiece fixing plate for replacing workpieces on machine tools. 3. Scope of Claim for Utility Model Registration In the hydraulic clamping device described in paragraph 1, the hydraulic clamping device C is a square-shaped workpiece fixing block for exchanging workpieces in a horizontal mechanism.