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Overload limit alarm device

An alarm device and alarm technology, applied in the field of hydraulic cranes and towing winches, can solve the problems of long maintenance time and low efficiency, and achieve the effect of safe and reliable performance, simple principle, and easy maintenance

Active Publication Date: 2016-09-14
SOUTH CHINA MARINE MACHINERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an overload limit alarm device, which can solve the problems of long maintenance time and low efficiency when the overload alarm device of a hydraulic crane fails

Method used

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  • Overload limit alarm device

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Embodiment Construction

[0008] Below in conjunction with accompanying drawing and embodiment the present invention is described in further detail:

[0009] figure 1 The overload limit alarm device shown is composed of a pressure relay PS, a first relay K1, a second relay K2, a neutral switch SB1 of the operating handle, an ascending electromagnetic reversing valve PV, an overload alarm indicator light H, and an overload alarm buzzer HA , Self-locking with light mute button switch SB2 composition.

[0010] Under normal working conditions, the pressure of the oil circuit in the lifting hydraulic pipeline is below the preset pressure value, the normally closed contact of the pressure relay PS does not act, the normally closed contact of the PS remains on, and the first relay K1 The coil of the second relay K2 is energized, the normally closed contact of the first relay K1 is disconnected, the second relay K2 is in the state of de-energization, the normally closed contact of the second relay K2 is conne...

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PUM

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Abstract

The invention discloses an overload limit alarming device and relates to the technical field of manufacturing of hydraulic cranes and dragging winches. The overload limit alarming device comprises a pressure relay arranged in a hydraulic oil path, and a middle-position switch and a audible and visual alarming element which are arranged on an operation handle; a normally closed contact of the pressure relay is connected with a coil of a first relay; a normally closed contact of the first relay is connected with a coil of the second relay; and a normally closed contact of the second relay is connected with a coil of an ascending electromagnetic directional valve. By virtue of the overload limit alarming device, the problems that when the overload limit alarming device of the hydraulic crane has a fault, the maintenance time is long and the efficiency is low can be solved.

Description

technical field [0001] The invention relates to the technical field of manufacturing hydraulic cranes and towing winches, in particular to an overload limit alarm device for hydraulic crane overload. Background technique [0002] At present, in the application of hydraulic cranes and towing winches, the overload limit alarm device generally uses a load cell to detect the tension signal on the wire rope. This signal is generally an analog signal, and the analog signal is transmitted to the computer CPU processing center. After processing by various mathematical logic operations, the center outputs a switch signal, and connects this signal in series to the control lifting circuit of the crane. When the lifting tonnage of the crane exceeds the set value, the power source of the lifting circuit is cut off. Stop the lifting action of the crane; at the same time, use the output switch signal to drive the light, buzzer and other audible and visual alarm devices to work, and send ou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B66C15/06
CPCB66C15/06
Inventor 胡凌
Owner SOUTH CHINA MARINE MACHINERY