Tow system with broken filament detection device

Abstract

The invention provides a traction system with broken wire detection device, and aims to solve the problem of how to realize online detection of broken wire. The traction system comprises a traction wheel, a traction steel belt and a rope head combination, and further comprises a normally open relay and a power supply. Two ends of the coil of the normally open relay are connected to the positive pole of the power supply and the rope head respectively, the negative pole of the power supply is grounded, and the normally open contact of the normally open relay serves as a switch of an alarm circuit. The traction system has the positive effect of realizing online detection of whether the traction system has the phenomenon of broken wire, and eliminating the hidden danger of the traction system.

Description

TECHNICAL FIELD

[0001] The present application relates to a hoisting system, in particular a hoisting system with a broken wire detection device. BACKGROUND

[0002] The hoisting system of an elevator or a crane comprises a hoisting wheel, a hoisting steel belt and a rope head assembly. The hoisting steel belt is composed of a plurality of parallel steel ropes encapsulated in a plastic coating layer. The steel ropes are conductive materials, and the plastic coating layer is an insulating material. The rope head assembly comprises rope heads exposed from the plastic coating layer. Each steel rope has one rope head. For example, if four steel ropes are encapsulated in the plastic coating layer, the rope head assembly has four rope heads. The hoisting steel belt may have a broken wire during use. If the broken wire is not found in time, the hoisting steel belt may have a broken strand, which may cause a hidden danger to personal safety. Therefore, it is necessary to detect whether the hoisting steel belt has a broken wire in time. The current method for detecting whether the hoisting steel belt has a broken strand is to connect a wire between adjacent rope heads of the rope head assembly to realize the series connection of the steel ropes, and then apply a detection voltage to determine whether the detected steel rope has a broken strand according to the on-off state. The method has the following defects: first, the cost is high; and second, the detection process is relatively troublesome. SUMMARY

[0003] To solve the above technical problems, the purpose of the present application is to provide a hoisting system with a broken wire detection device.

[0004] The purpose of the present application is achieved as follows: it comprises a hoisting wheel, a hoisting steel belt and a rope head assembly. The rope head assembly comprises rope heads. The hoisting system further comprises a normally open relay and a power supply. The two ends of the coil of the normally open relay are connected to the positive electrode of the power supply and the rope head, respectively. The negative electrode of the power supply is grounded. The normally open contact of the normally open relay serves as a switch of an alarm circuit.

[0005] When the hoisting steel belt does not have a broken wire, the hoisting steel belt is insulated, the above circuit is disconnected, the normally open relay is not powered and does not act. When the hoisting steel belt has a broken wire, the broken wire will pierce the coating layer of the hoisting steel belt and damage the insulation of the hoisting steel belt. When the broken wire passes through the hoisting wheel, it is grounded and forms a loop. The above circuit is connected, the coil of the normally open relay is powered, the normally open contact acts (closes), the alarm circuit is connected, and an alarm signal is sent.

[0006] Compared with the prior art, the present application has the following positive effects: it realizes online detection of whether the hoisting system has a broken wire phenomenon, and eliminates the hidden danger of the hoisting system. BRIEF DESCRIPTION OF DRAWINGS

[0007] The present application will be further described below with the application of the hoisting system of an elevator as an example.

[0008] Figure 1 is a schematic view of the present application.

[0009] Figure 2 is Figure 1 schematic diagram of the application.

[0010] Figure 3 is a schematic diagram of the application applied to an elevator traction system with more than two traction sheaves. DETAILED DESCRIPTION

[0011] Referring to Figure 1 , the elevator traction system comprises a car 1, a guide pulley 2, a rope head assembly 3, a guide wire 4, a detection device 5, a traction sheave 6, a traction steel belt 7 and a counterweight 8. Referring to Figure 2 , the detection device 5 comprises a normally open relay 52 and a power supply 51 thereof, the traction steel belt 7 is encapsulated in a plastic coating layer 71 by four parallel steel wires, the rope head assembly 3 comprises four rope heads 31, each of which is connected to one end of a normally open relay coil, the other end of the normally open relay coil is connected to the positive electrode of the power supply, the negative electrode of the power supply is grounded, and the normally open contact of the normally open relay serves as a power switch of the alarm circuit (omitted as it is prior art).

[0012] When the traction steel belt has no broken wire and is insulated, the above-mentioned circuit is disconnected, the normally open relay is not powered and does not act. When the traction steel belt has a broken wire 10, the broken wire will pierce the coating layer of the traction steel belt, thereby damaging the insulation of the traction steel belt. When the broken wire passes through the traction sheave, it is grounded and forms a loop, the above-mentioned circuit is connected, the normally open relay coil is powered, the normally open contact is actuated (closed), the alarm circuit is connected, and an alarm signal is sent.

[0013] The elevator traction system usually uses more than two traction sheaves, as shown in Figure 3 , that is, two or more traction sheaves 6 are installed on the traction sheave shaft 9, and there are corresponding traction steel belts and rope head assemblies. When there are three traction sheaves, there will be three traction steel belts and rope head assemblies. When there are more than two rope head assemblies, the rope head connected to one end of the normally open relay coil means that all the rope heads 31 in the entire rope head assembly (traction steel belt) are connected to the end of the normally open relay coil 52 through a guide wire 4.

Claims

1. A traction system with a broken wire detection device, comprising a traction sheave, a traction steel belt, and a rope end assembly, wherein the rope end assembly includes a rope end, and the traction steel belt is composed of multiple parallel steel wire ropes encapsulated in a plastic coating layer, each steel wire rope having a rope end, characterized in that: It also includes the normally open relay and its power supply, the normally open relay coil is connected to the positive and the end of the rope, the negative power supply is grounded, the normally open contact of the normally open relay as an alarm circuit switch; When the traction steel belt appears broken wire, the broken wire of the traction steel belt cladding through the traction wheel is grounded, forming a loop, the normally open relay coil is powered on, and the normally open contact is closed.

2. Towed system with broken filament detection according to claim 1, characterized in that: When there are two or more rope combinations, all the ropes in all the rope combinations pass through a wire and are connected to the end of the normally open relay coil.

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