CN113460613A

CN113460613A - Belt conveyor protector

Info

Publication number: CN113460613A
Application number: CN202010245444.7A
Authority: CN
Inventors: 陶中明; 丁海泉; 岳鑫先
Original assignee: Shanghai Meishan Iron and Steel Co Ltd
Current assignee: Shanghai Meishan Iron and Steel Co Ltd
Priority date: 2020-03-31
Filing date: 2020-03-31
Publication date: 2021-10-01
Anticipated expiration: 2040-03-31
Also published as: CN113460613B

Abstract

The invention relates to a belt conveyor protection device, which comprises a basic socket, a movable plug, a trigger button, an operation indicator lamp, a movable cable and a safety switch SB, wherein the basic socket is provided with a left conductive elastic contact and a right conductive elastic contact which are arranged at fixed positions around a belt and are connected with the basic socket in series through a wiring pile; the scheme can carry out shutdown safety protection in various modes, and ensures that the protection device works reliably; the safety switch of the protection device can be fixed and movable, and personnel entering a dangerous area can carry the safety switch with them, so that safety events can be conveniently and quickly handled.

Description

Belt conveyor protector

Technical Field

The invention relates to a protective device, in particular to a protective device for a belt conveyor, and belongs to the technical field of electrical equipment control.

Background

The belt conveyor is widely applied to industrial production environment, at present, the protection measures for personal safety are mainly implemented by means of a pull-cord switch, remote monitoring and the like, and personnel who inspect and overhaul the periphery of the belt are required to strictly follow operation regulations to avoid safety accidents caused by the fact that the personnel touch the running belt.

A belt pull switch or other protective device has a fixed mounting structure, and its electrical schematic is shown in fig. 1. Install SQ1 around the belt, a plurality of stay cord protection switches such as SQ2 … SQn, participate in belt interlock control through the mode of establishing ties with stay cord relay KA, under normal conditions, all stay cord switches are closed, make stay cord relay KA coil electrified, auxiliary contact KA actuation, and then allow the belt operation, in case staff around the stay cord switch discovers that the belt operation appears unusually and triggers the stay cord switch, the normally closed point that will make a stay cord switch breaks, stay cord relay KA coil loses the electricity, auxiliary contact KA disconnection, and then forbid the belt operation, thereby realize safety interlock protection.

Although the belt injury accidents are prevented by measures such as a pull-cord switch and strict operating regulations, a great number of casualty accidents are caused by accidental operation and illegal entry of the belt into a belt operation area every year. The research belt feeder personal safety accident takes place the reason, mainly does:

1. in the process of inspection and maintenance, belt sudden start causes belt contact personnel to be injured, and the root cause is that the start and stop of the belt cannot be reliably controlled due to the lack of intrinsically safe interlocking protection equipment and control method;

2. at the moment after a safety accident happens, injured people cannot control a belt operation signal and cannot save themselves, and if no person is cared around or nursing personnel cannot intervene in the belt operation in time, the injury accident is caused;

3. the existing installation positions of protection equipment such as a pull-cord switch are fixed, and the protection function can be lost due to the fact that an operator cannot trigger the protection equipment in an emergency. Therefore, a new solution to solve the above technical problems is urgently needed.

Disclosure of Invention

The invention provides a belt conveyor protection device aiming at the problems in the prior art, and the technical scheme is mainly to invent the belt conveyor protection device and the method which are suitable for ensuring the personal safety of belt polling and maintenance personnel, and solve the problem that safety protection equipment and operation methods are lacked in the belt polling and maintenance process at present.

In order to achieve the purpose, the technical scheme of the invention is that the protective device for the belt conveyor comprises a basic socket, a movable plug, a trigger button, an operation indicator lamp, a movable cable and a safety switch SB, wherein the basic socket is provided with a left conductive elastic contact and a right conductive elastic contact which are arranged on fixed positions around a belt and are connected with the basic socket in series through a wiring pile, the movable plug comprises a left conductive connector and a right conductive connector which are insulated from each other, the left connector and the right conductive elastic contact are respectively contacted with the elastic contacts after the movable plug is inserted into the basic socket, the safety switch SB is respectively connected with the left connector and the right connector through the movable cable, and the operation indicator lamp Ne lamp is connected with the ground through a high-resistance resistor R.

As an improvement of the invention, the safety switch comprises a movable handle, a fixed contact and a movable contact, the safety switch and a movable plug are connected through a movable cable, the movable handle and the fixed handle are connected through a spring, the fixed contact and the movable contact are respectively arranged on the movable handle, the fixed contact and the movable contact are respectively connected with two lines of the movable cable, the movable handle can be in 3 positions of releasing, home position and pressing along a shaft, wherein in the home position, a certain pressure is required to be applied to the movable handle to keep the fixed contact and the movable contact in contact, and in the releasing (pressure disappearing) and pressing (pressure increasing) states, the fixed contact and the movable contact are separated to disconnect the safety switch.

As an improvement of the invention, a spring is arranged between the movable handle and the fixed handle, the movable handle can keep the safety switch from being triggered only by applying pressure (about 3N) to the direction of the fixed handle, and once the pressure disappears or the pressure is too high (more than 6N), the safety switch is triggered, so that personnel can trigger the safety switch in the case of runaway and emergency.

As an improvement of the invention, the protective device is arranged to be movable, and the safety switch can be carried by workers in an operation range by connecting the movable cable with the basic socket.

The method for protecting the belt conveyor protecting device comprises any one of the following modes: directly loosening or pressing the safety switch or pulling the cable to separate the socket and the plug of the protection device; or other monitoring personnel to trigger the guard nearby. When one or more protective devices are triggered, the belt is stopped for protection, the neon lamp is turned off after the triggered first protective device, the position and the state of the triggered equipment of inspection personnel are prompted, and quick resetting is facilitated.

Compared with the prior art, the invention has the advantages that 1) the technical scheme can carry out shutdown safety protection in multiple modes, thereby ensuring the reliable work of the protection device; 2) the safety switch of the protection device can be fixed and movable, and personnel entering a dangerous area can carry the safety switch with the person, so that safety events can be conveniently and quickly handled; 3) the safety switch conforms to the emergency response action principle of people, the triggering protection action is simple, and the situation that emergency shutdown cannot be carried out due to confusion is avoided; 4) the protection device is provided with a working state indicator light, so that the fault can be conveniently and rapidly positioned and processed; 5) after a human body is rolled into the belt, the switch circuit of the protective device can be pulled off along with the human body to carry out emergency protection; 6) the protection device can be configured according to the actual requirement on site, the working principle is simple, and the installation, debugging and maintenance are convenient.

Drawings

FIG. 1 is a schematic diagram of the operation of a belt pull-cord switch (KA auxiliary contact is closed);

FIG. 2 is a block diagram of a belt conveyor guard;

FIG. 3 is a schematic diagram of the operation of the belt conveyor guard (KA auxiliary contact closed);

FIG. 4 is a schematic diagram of the guard activation (KA auxiliary contact open);

FIG. 5 is a schematic diagram of the safety switch structure and operation;

FIG. 6 is a schematic illustration of a belt conveyor guard installation.

Wherein 1-a base socket; 2-wiring piles; 3-a resilient contact; 4-moving the plug; 5-left joint; 6-right joint; 7-a mobile cable; 8-a movable handle; 9-fixed contact; 10-moving contact; 11-a spring; 12-a holder; 13-fixed handle.

The specific implementation mode is as follows:

for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.

Example 1: referring to fig. 1, a belt conveyor protector comprises a base socket 1, a mobile plug 4, a trigger button, an operation indicator light, a mobile cable 7 and a safety switch SB, wherein the base socket 1 is provided with a left conductive elastic contact and a right conductive elastic contact 3, the left conductive elastic contact and the right conductive elastic contact are arranged at fixed positions around a belt and are connected with the base socket in series through a wiring pile 2, the mobile plug 4 comprises a left conductive connector 5 and a right conductive connector 6 which are insulated from each other, the left connector 5 and the right connector 6 are respectively contacted with the elastic contacts 3 after the mobile plug 4 is inserted into the base socket 1, the safety switch SB is respectively connected with the left connector 5 and the right connector 6 through the mobile cable 7, an operation indicator lamp Ne is connected with the ground through a high-resistance resistor R, the safety switch comprises a mobile handle 8, a fixed handle 13, a fixed contact 9 and a movable contact 10, and the safety switch is connected with the mobile plug 4 through the mobile cable, the movable handle 8 and the fixed handle 13 are connected through a spring 11, a fixed contact 9 and a movable contact 10 are respectively arranged on the movable handle 8, the fixed contact 9 and the movable contact 10 are respectively connected with two wires of the movable cable 7, the movable handle 8 can be in 3 positions of releasing, home position and pressing along the shaft, wherein certain pressure is required to be applied to the movable handle to keep the fixed contact and the movable contact in contact when in the home position, and the fixed contact 9 and the movable contact 10 are separated to disconnect the safety switch when in the releasing (pressure disappears) state and the pressing (pressure increases) state, the spring 11 is arranged between the movable handle 8 and the fixed handle 13, and the protection device is arranged to be movable.

Under the condition that the belt normally runs, the belt conveyor protective device is serially connected into an interlocking protection system of the belt, and the working principle diagram is shown in fig. 3. The mobile plug 4 is inserted into the basic socket 1, the switch SB is closed, the current flows into the left spring contact 3 of the basic socket 1 via the terminal stud 2 as shown by the arrow in figure 3, as the left elastic contact contacts the left connector 5 on the mobile plug 4, the current is conducted, flows through the closed safety switch SB along the mobile cable 7, and then flows into the right connector 6 on the mobile plug 4, because the right elastic contact contacts with the right connector 6 on the movable plug 4 to conduct current, the current continues to flow into the next belt conveyor protective device, a grounding resistor R and a light-emitting neon lamp Ne are arranged between the belt conveyor protective devices, as the circuit is conducted, the light-emitting neon lamp Ne is lighted to indicate that the belt conveyor protection device at the position is in a normal working state, the current finally passes through the coil of the protection relay KA to enable the auxiliary contact to be attracted, and the belt electric control system allows the belt to run.

The staff is at the during operation around the belt, will carry on safety switch SB through the travelling cable, and band conveyer protector will have the chain belt feeder running signal of three kinds of modes to guarantee personnel's safety around the belt: 1. the connection between the basic socket 1 and the movable plug 4 is directly disconnected, as shown by the protection device of SB1 in FIG. 4, at this time, the current is cut off before the first basic socket and the KA coil cannot be driven, and the belt is in chain protection shutdown; 2. the person carrying the safety switch SB opens the normally closed switch, as shown in fig. 4 by the protection device of SB2, at this time the current will be cut off at the front seat of the safety switch SB of the second device and will not drive the KA coil, and the belt will be interlocked to protect the machine. 3. When personnel carry out safety monitoring operation, the staff can enter a working place without carrying a safety switch, and when the monitoring personnel find abnormality, any plug can be disconnected or a safety button placed on the ground is triggered, so that the belt is in chain protection and shutdown. After the protection device is triggered, the corresponding neon bulb is turned off to prompt the maintainers.

The working principle of the safety switch SB conforms to the operation habit of people under emergency operation: the danger of releasing or grasping an object is encountered and the structure and working principle diagram are shown in fig. 5. The safety switch is connected with the movable plug 4 through a movable cable, the movable handle 8 is connected with the fixed handle 13 through a spring 11, a fixed contact 9 and a movable contact 10 are respectively arranged on the movable handle, the fixed contact 9 and the movable contact 10 are respectively connected with two wires of the movable cable 7, the movable handle can be in 3 positions of releasing, home position and pressing along a shaft, wherein certain pressure is required to be applied to the movable handle to keep the fixed contact and the movable contact in contact when the movable handle is in the home position, and the fixed contact 9 and the movable contact 10 are separated when the movable handle is in the releasing (pressure disappears) state and the pressing (pressure increases) state, so that the safety switch is disconnected.

When the safety switch is installed on the ground, the movable handle and the fixed handle are limited by the fixer 12, the movable handle is in the original position and cannot be loosened, the fixed contact 9 and the movable contact 10 on the movable handle are contacted, the switch is closed, and the current can flow through the switch to realize the belt running. In emergency, the person directly presses the movable handle 8 of the safety switch, at this time, the fixed contact 9 and the movable contact 10 are separated, and the current flowing through the switch is interrupted, so that the coil of the safety interlocking relay is powered off to carry out shutdown protection. When a person carries the safety switch with the person, the person can apply a certain force with one hand to hold the movable handle 8 and the fixed handle 13 to keep the fixed contact 9 and the movable contact 10 closed, inspection is carried out around the belt, and the fixed contact 9 and the movable contact 10 are separated by immediately loosening or pressing the handles in case of emergency, so that the belt is stopped emergently. Or the safety switch is arranged in the fixer to be carried with the user, and the movable handle is immediately pulled out or pressed to separate the fixed contact 9 from the movable contact 10 in case of emergency, so that the belt is stopped emergently.

The installation schematic diagram of the belt conveyor protection device is shown in fig. 6, a plurality of protection devices are installed around the belt conveyor, each protection device is provided with a mobile cable, the protection range of the protection device can cover the working area of workers, and the indicating neon lamps Ne on the protection devices are installed at the positions which are convenient for the inspection personnel to observe. When the belt conveyor normally works, each protection device can conduct the current for driving the safety relay KA, and at the moment, neon lamps of all protection devices along the belt are all lightened to indicate that the current flows. When working around the belt, the staff can carry corresponding safety switch, has three kinds of methods and can carry out shutdown protection: 1. directly loosening or pressing the safety switch; 2. pulling the cable to separate the socket and the plug of the protection device; 3. other guardians trigger the protective device nearby. When one or more protective devices are triggered, the belt is stopped for protection, the neon lamp is turned off after the triggered first protective device, the position and the state of the triggered equipment of inspection personnel are prompted, and quick resetting is facilitated.

The application example is as follows: referring to fig. 1-6, and 2 and 5, the belt conveyor protection device is manufactured, a base socket is provided with a left conductive elastic contact and a right conductive elastic contact, the left conductive elastic contact and the right conductive elastic contact can be connected with other base sockets in series through a wiring pile, a movable plug comprises a left conductive connector and a right conductive connector which are mutually insulated, the left conductive connector and the right conductive connector can be respectively contacted with the elastic contacts after the movable plug is inserted into a base socket 1, and the force for separating and combining the plug and the socket is 20N. The safety switch SB is connected to the left joint and the right joint through a movable cable (two wires), respectively. The neon lamp Ne is connected to the ground through a high-resistance resistor R (10M Ω or more). The safety switch is connected with the movable plug through a movable cable, the movable handle is connected with the fixed handle through a spring, a fixed contact and a movable contact are respectively arranged on the movable handle, the fixed contact and the movable contact are respectively connected with two wires on the movable cable, the movable handle can be in 3 positions of loosening, home position and pressing along a shaft, the spring can generate pressure when in the home position, about 10N reverse pressure needs to be applied to the movable handle to keep the fixed contact and the movable contact in contact, and the fixed contact 9 and the movable contact 10 are separated when in loosening (pressure disappears) and pressing (more than 20N) states, so that the safety switch is disconnected. In the embodiment, the length of the belt is 50 meters, 4 protective devices are uniformly arranged along two sides of the belt, and the length of a moving cable of each protective device is not less than 12.5 meters, so that the working area of a person on the belt can be covered. The neon indicator Ne on the protection device is arranged at the position which is convenient for the inspection personnel to observe. When the belt conveyor normally works, each protection device can conduct the current for driving the safety relay KA, and at the moment, neon lamps of all protection devices along the belt are all lightened to indicate that the current flows. When working around the belt, the staff can carry corresponding safety switch, has three kinds of methods and can carry out shutdown protection: 1. directly loosening or pressing the safety switch; 2. pulling the cable to separate the socket and the plug of the protection device; 3. other guardians trigger the protective device nearby. When one or more protective devices are triggered, the belt is stopped for protection, the neon lamp is turned off after the triggered first protective device, the position and the state of the triggered equipment of inspection personnel are prompted, and quick resetting is facilitated.

It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.

Claims

1. The utility model provides a belt conveyor protector, its characterized in that, protector includes basic socket, mobile plug, trigger button, operation pilot lamp, travelling cable and safety switch SB, two electrically conductive elastic contact about having on the basic socket install on the fixed position around the belt, establish ties through wiring stake and basic socket, contain the electrically conductive left side of mutual insulation and connect with the right side on the mobile plug, left side connect with the right side connect respectively with the elastic contact after mobile plug inserts basic socket with the right side connect respectively, and safety switch SB connects left side respectively and connects with the right side through the travelling cable, and the operation instruction is neon lamp Ne and is connected with the ground through high resistance R.

2. The belt conveyor guard of claim 1, wherein the safety switch comprises a movable handle, a fixed contact and a movable contact, the safety switch and the movable plug are connected by a movable cable, the movable handle and the fixed handle are connected by a spring, the fixed contact and the movable contact are respectively mounted on the movable handle and the fixed handle, the fixed contact and the movable contact are respectively connected with two wires of the movable cable, and the movable handle can be in 3 positions of releasing, home position and pressing along the shaft.

3. The belt conveyor guard of claim 1 wherein a spring is disposed between the movable handle and the fixed handle.

4. A belt conveyor guard according to claim 3 characterised in that the guard is provided with a movability, whereby the safety switch is carried along by the staff in the working range by moving the cable connection base socket.

5. A protection method based on the belt conveyor protection device of any one of claims 1-4, characterized in that the method comprises any one of the following modes: directly loosening or pressing the safety switch or pulling the cable to separate the socket and the plug of the protection device; or other monitoring personnel to trigger the guard nearby.