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Circuit arrangements for operating torque wrenches or similar devices

A technology of circuit layout and torque wrench, which is applied in the direction of wrench, fluid pressure actuator, servo motor, etc., and can solve the problems that the final pressure cannot, cannot maintain pressure, maintain, etc.

Inactive Publication Date: 2015-11-25
罗素麦特拧紧技术公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The set final pressure cannot be maintained by this method
[0006] The first above-mentioned proposal of preselecting the pressure by means of a pressure gauge has the disadvantage that the operator himself has to carry out every adjustment or correction of the pressure directly at the hydraulic unit
[0007] Although the second above-mentioned version ("pressure preselection via pressure switch") enables the pressure to be adjusted separately from the hydraulic unit, the disadvantage here is that due to the switch interrupting the hydraulic supply and thus to some extent the "flow pressure" , so the pressure cannot be maintained
Creep of threaded connections cannot be compensated in this way

Method used

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  • Circuit arrangements for operating torque wrenches or similar devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] The hydraulic torque wrench has a piston-cylinder unit 18 with a piston 19 arranged in a cylinder 26 , with a pressure chamber 20 arranged on the piston rod side on the side of the piston rod 21 and with a cylinder chamber 28 .

[0016] The pressure chamber 20 on the piston rod side and the cylinder chamber 28 are connected to the tank 10 by hydraulic lines (hydraulic return line 13 and hydraulic supply line 14) which open up to the pressure chamber on the piston rod side 20, and the hydraulic supply line 14 opens to the cylinder cavity. A single-stage or multi-stage pump 11 driven by a motor M is arranged in the water tank 10 . The pump 11 itself and the motor M of the pump 11 may be arranged in hydraulic fluid for cooling.

[0017] A proportional valve 12 , controllable by a control device 16 via an electrical control cable 27 , is connected between the piston-cylinder unit and the water tank 10 . The control device 16 in turn can be set by the remote control unit 3...

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Abstract

The invention relates to a circuit arrangement for operating a hydraulic torque wrench or similar, comprising a piston-cylinder unit (18) that can be controlled at a predetermined pressure by a pump (11). Said arrangement is characterized in that the piston-cylinder unit (18) can be controlled by the pump (11) by means of a proportional valve (12) which acts both as a reversing unit between the forward and return travel and as a pressure control valve.

Description

technical field [0001] The invention relates to a circuit arrangement for operating a torque wrench or similar device having a piston-cylinder unit which can be controlled by a pump at a prescribable pressure. Background technique [0002] Such hydraulic torque wrenches are usually connected by hoses up to 10m to a hydraulic unit, which includes a pump. In this way, the hydraulic unit is no longer visible to the operator operating the hydraulic torque wrench. However, when visually checking to determine that the set pressure has actually been reached, observation of the pressure gauge, which is arranged near the hydraulic unit, is necessary. Therefore, the operator wishes to be able to adjust and read all the functions of the hydraulic unit through the remote controller without having to find out the current position of the hydraulic unit, for example, the hydraulic unit is far away from the torque wrench. [0003] Various possible solutions have been provided in the prior...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B25B21/00B25B23/145
CPCB25B23/145B25B21/005B25B23/1456F15B9/09F15B13/0442
Inventor 马克·加赖斯
Owner 罗素麦特拧紧技术公司