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Safety plant for a cable stretching machine, corresponding method and stretching machine using said plant

A stretching machine and equipment technology, applied in the direction of overhead line/cable equipment, mechanical equipment, brake actuators, etc., can solve problems such as damage, loss of cable tension, uncoordinated stop, etc.

Active Publication Date: 2015-10-07
TESMEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the action to preserve the tension is not coordinated with the stop of the moving device
[0017] Thus, there is an overload on the cable, and the possibility of damaging or breaking the cable, which has serious implications for operators, especially those on overhead or railway equipment, and also for everything connected to or under the cable. Obvious safety risk and problem: this defeats the safety function of negative brakes in practice
[0022] In particular, when electrical or hydraulic components of the stretching machine fail, and if the distributor valve is of the non-holding action type, the pressure of the working fluid generated by the pressure energy accumulator prevents the capstan rotation from being suddenly blocked, thereby following The negative recoil is cleared, but in any case opening the maximum pressure valve will cause a loss of tension in the cable

Method used

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  • Safety plant for a cable stretching machine, corresponding method and stretching machine using said plant
  • Safety plant for a cable stretching machine, corresponding method and stretching machine using said plant
  • Safety plant for a cable stretching machine, corresponding method and stretching machine using said plant

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Embodiment Construction

[0043] The invention relates to a safety device 10 for a stretching machine 11 of a cable ( figure 1 ), this cable is wound on the corresponding capstan, in this case a pair of capstans.

[0044] The stretching machine 11 is of the type having a braking function and configured to control the tension with which the cable is unwound from the pair of winches.

[0045] The stretching machine 11 comprises at least one hydraulic motor 13 configured to be drawn in rotation by the pair of winches 12, operating as a hydraulic pump to keep the cable under tension during normal stretching operations.

[0046] The hydraulic motor 13 is connected to a hydraulic circuit comprising a suction branch 14 through which working fluid is drawn from a tank 17 , and a delivery branch 16 or pipe connected to a maximum pressure valve 18 . The maximum pressure valve 18 is configured to maintain a substantially constant pressure in the delivery branch 16 and subsequently in the hydraulic motor 13 even ...

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PUM

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Abstract

Safety plant for a stretching machine (1 1) of the brake type comprising a negative brake (22) which can be selectively activated and de-activated so as to constrain and respectively allow the rotation of at least one capstan (12) which supports cables, a pumping device (24) connected to the negative brake (22) and configured to de-activate the latter during the normal use of the stretching machine (11), putting a working fluid under pressure, pressure energy accumulation means (32) of said working fluid, and a maximum pressure valve (18) configured to regulate the working pressure of a hydraulic motor (13) for controlling the twisting torque applied to the capstan (12). The plant also comprises a motorized drive device (19) connected to the maximum pressure valve (18) and provided to selectively regulate the action of the latter on the hydraulic motor (13), even in a breakdown condition of at least the pumping device (24), in order to maintain the working pressure of the hydraulic motor (13) and to maintain the negative brake (22) de-activated by the intervention of the pressure energy accumulation means (32).

Description

technical field [0001] The invention relates to a safety device for a cable tensioning machine. [0002] In particular, the safety device consists of a hydraulic circuit, preferably but not exclusively applied to a stretching machine of the brake type suitable for applying a controlled tension to the wire during the stretching step. According to the invention, the safety device is provided with a safety device which intervenes in the event of failure of a device component or in an emergency situation. [0003] The invention also relates to a corresponding method for safety control of a cable drawing machine, and a drawing machine using said safety device. Background technique [0004] Stretching machines are known, for example for stretching high voltage electric lines, railway lines or other lines, usually overhead lines; this stretching machine provides so-called "brake" stretching of cables by means of a plurality of winches, The cables to be stretched or respectively r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G1/04B60M1/28
CPCH02G1/04B60M1/28F16D59/00F16D65/28
Inventor 莫里吉奥·维塔利阿尔贝托·奥斯卡
Owner TESMEC
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