Locking device for a mine scraper conveyor

Abstract

The utility model relates to a coal mine fully mechanized coal mining face electric control system, concretely relates to a locking device of mine scraper conveyor, it includes intrinsic safety power module, communication module, wiring terminal, locking switch, pilot lamp, wire inlet and shell composition. The device uses locking switch and communication module in cooperation through locking device inside, when pulling out the pull ring of locking switch, locking switch contact breaks, makes the emergency stop of slide, realizes the locking, and communication module receives locking switch action signal transmission to programmable controller PLC a communication address, and programmable controller PLC is accurately positioned according to communication address which locking device locked and shows on display screen, safe and reliable, reasonable in design, the device has popularization value.

Description

Technical Field

[0001] This utility model relates to the electrical control system of a fully mechanized coal mining face, specifically to a locking device for a mining scraper conveyor. Background Technology

[0002] Scraper conveyors are important equipment for coal mine transportation. A scraper conveyor consists of a head frame and a tail frame. The head frame and tail frame are equipped with head wheel assembly and tail wheel assembly, respectively. The head wheel assembly is connected to a transmission device, which is driven by a motor. The start and stop of the motor indicate the start and stop of the scraper conveyor.

[0003] With the increasing coal production in fully mechanized mining faces in coal mines, the length of scraper conveyors is also getting longer. In the current technology, the length of scraper conveyors from head to tail is about 300 meters. Several workers are on hand to maintain its operation during the process. In the event of a movement accident, the workers need to shut down the conveyor in time. However, it would obviously waste a lot of time for the workers to walk from the middle of the conveyor to the head to manually shut down the motor.

[0004] According to the requirements of the "Coal Mine Safety Regulations", interlocking devices are installed along the scraper conveyor to facilitate on-site control by staff to stop the scraper conveyor in a timely manner. The spacing between the interlocking devices shall not exceed one every 15 meters. The interlocking devices are connected in series with the control power circuit of the motor, so that power can be cut off from any interlocking device, so that the scraper conveyor can be shut down in a timely manner after a problem is discovered.

[0005] A single longwall mining face can have more than twenty scraper conveyors installed along its entire length. Activation of any one of these switches will cause the scraper conveyor to stop. The coal mining face environment is harsh, and accidental activation frequently occurs. When an accident occurs or damage occurs, it is difficult to directly determine which switch caused the accident, or which switch is the normal interlock. This causes problems for production control. To restore operation, personnel need to be dispatched to check the scraper conveyor one by one to find the cause of the problem, seriously affecting safety and production. Utility Model Content

[0006] The technical problem this invention aims to solve is that when the locking device of a scraper conveyor is accidentally activated, the position of the action switch cannot be quickly determined.

[0007] The technical solution adopted by this utility model to solve the aforementioned problem is: A locking device for a mining scraper conveyor includes a housing. A locking switch is provided on the surface of the housing. The locking switch is a double-pole switch with contacts A and B; the opening of contact A triggers the opening of contact B. An inlet and an outlet are respectively provided on opposite outer walls of the housing surface. An indicator light, a power module, a communication module, and terminal blocks are provided inside the housing. The indicator light is mounted on the top of the housing and is used to reflect the circuit status. The first output terminal of the power module is connected to the indicator light, and the second output terminal is connected to the communication module. The terminal blocks have five connection points, numbered ① to ⑤, where connection point ① and connection point ②... Connection point 1 is connected to the input terminal of the power module via a wire; connections points 3 and 4 are connected to the communication module via wires; connection point 5 is connected to the negative terminal of contact a of the interlock switch via a wire; the input terminal of the communication module is connected to contact b, and the output terminal is connected to connections points 3 and 4; the cable, a five-core cable, enters the housing from the inlet, with the break points of two power lines connected to connections points 1 and 2; the break points of two signal lines connected to connections points 3 and 4; the break point of one control line connected to the positive terminal of both connection point 5 and contact a; the end of the cable away from the inlet is connected to the PLC controller, and the end of the cable away from the outlet is connected to the inlet of the next housing.

[0008] Compared with the prior art, the advantages of this utility model with the above structure are: This interlocking device can lock the chute and achieve precise positioning through communication with the programmable logic controller (PLC). When the interlocking device is activated or malfunctions, the PLC can accurately lock the activated interlocking device, thereby quickly restoring production.

[0009] As a preferred option, a further technical solution to the above structure is: The indicator light is a light panel with evenly distributed lamp cores in the central area and an outer edge plate. Mounting holes are provided on the top surface of the housing, and fitting platforms are provided within the inner edges of the mounting holes. The lamp core areas are embedded in the mounting holes, and the edge plates are fixedly connected to the fitting platforms with bolts. A sealing gasket is placed between the edge plates and the fitting platforms. The light panel can display the circuit status of the interlocking device locally, allowing workers to quickly identify the location of accidental activation of the interlocking device and facilitating construction.

[0010] The LED panel can display both red and green light, making it easy to distinguish between power-on and power-off states.

[0011] The monitoring center is equipped with display screens that show the circuit status of each interlocking device. These screens allow for a direct and centralized observation of the status of all interlocking switches, enabling rapid identification of any abnormal switch actions based on the current production and operational conditions. Attached Figure Description

[0012] Figure 1This is an installation diagram of this utility model; Figure 2 This is a top-down structural schematic diagram of the present invention; Figure 3 This is a structural schematic diagram of the present invention from an elevation view. Figure 4 This is a schematic diagram of the circuit connection structure of each component of this utility model; Figure 5 This is a schematic diagram of the overall electrical control layout of this utility model.

[0013] Explanation of reference numerals in the attached drawings: 1 - Locking device; 2 - Hydraulic support; 3 - Indicator light; 4 - Cable inlet; 5 - Cable outlet; 6 - Locking switch; 7 - Housing; 8 - Power module; 9 - Communication module; 10 - Terminal block; 11 - Cable; 12 - Display screen; 13 - PLC controller. Detailed Implementation

[0014] The present invention will be further described below with reference to embodiments, the purpose of which is only to better understand the content of the present invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0015] The underground coal mining face uses hydraulic support. A single fully mechanized mining face consists of hundreds of sets of hydraulic supports, each of which includes multiple hydraulic telescopic props. A scraper conveyor is installed under the coal face to transport the coal ore excavated by the rotary drilling rig to the outside of the working face, and then transported to a designated location by a belt conveyor. The scraper conveyor travels approximately 200 meters in length. Workers move within the space created by the hydraulic support, between the scraper conveyor and the hydraulic telescopic props.

[0016] See Figure 1 The locking device 1 of the mining scraper conveyor provided by this utility model is part of the electronic control of the scraper conveyor. It is installed on the hydraulic support 2, and on average, one locking device 1 is installed every 10 sets of hydraulic supports 2.

[0017] See Figures 2 to 5 The locking device for a mining scraper conveyor provided by this utility model includes: Housing 7 is used to assemble the following electronic components; housing 7 has a locking switch 6, a wire inlet 4, and a wire outlet 5 on its surface. The interlocking switch 6 is a double-pole switch with contacts a and b. When contact a is open, contact b is opened. The inlet nozzle 4 and the outlet nozzle 5 are respectively located on the opposite outer wall surfaces of the housing 7, and are used to connect the external cable 11.

[0018] The housing 7 contains indicator lights 3, a power module 8, a communication module 9, and terminal blocks 10. Indicator light 3 is mounted on the top of housing 7 to reflect the circuit status; The first output terminal of the power module 8 is connected to the indicator light 3, and the second output terminal is connected to the communication module 9. Terminal block 10 has five connection points from ① to ⑤. Connection points ① and ② are connected to the input terminal of power module 8 via wires, connection points ③ and ④ are connected to communication module 9 via wires, and connection point ⑤ is connected to the negative terminal of contact a of interlocking switch 6 via wires. The input terminal of communication module 9 is connected to contact b, and the output terminal is connected to connection points ③ and ④.

[0019] Cable 11 enters the housing 7 through inlet 4. It is a five-core cable. The two power lines are connected to terminals ① and ②. The two signal lines are connected to terminals ③ and ④. The control line is connected to terminals ⑤ and the positive terminal of contact a. Cable 11 is connected to PLC controller 13, which is connected to the monitoring center.

[0020] Depending on its length, a fully mechanized mining face has approximately 20 interlocking devices 1, including the head light, intermediate light, and tail light. These interlocking devices 1 are connected to a PLC controller 13 via a 5-core cable. The PLC controller 13 is connected to a monitoring center, which is equipped with a display screen 12. The display screen 12 is used to display the circuit status of all interlocking devices 1.

[0021] Specifically, indicator light 3 is a light-emitting panel with evenly distributed lamp cores in its central area and an outer edge plate; the top surface of the housing 7 has mounting holes, and an inner edge of the mounting holes has a fitting platform. The lamp core area is embedded in the mounting holes, and the edge plate is fixedly connected to the fitting platform by bolts. A sealing gasket is placed between the edge plate and the fitting platform. The light-emitting panel can display both red and green lights. The display screen 12 displays the circuit status of each locking device 1.

[0022] A 5-core cable enters the interlocking device through the inlet port 4 and is connected to the terminal 10. Then it is connected to the next interlocking device 1 through the outlet port 5. In this way, more than 20 interlocking devices 1 are connected together.

[0023] The intrinsically safe power module 8 is connected to a two-phase 127V AC power supply and outputs two 12V DC power supplies. One of them supplies power to indicator light 3 to make it light up, and the other supplies power to communication module 9 as its working power supply.

[0024] When the interlock switch 6 is accidentally activated, the power supply circuit of the scraper conveyor is cut off. If the scraper conveyor is currently in motion, it will stop immediately, and the staff will be able to know that an accident has occurred. If the scraper conveyor is currently in a stopped state, it will not be able to start normally when restarting.

[0025] When this utility model is configured, in the event of accidental activation, contact a of the interlocking switch 6 will disconnect, and at the same time, contact b, which is linked by contact a, will also disconnect. The communication module 9 will receive an electrical signal and trigger the action. The communication module 9 will generate a communication address and transmit a signal to the PLC controller 13 through the 485 communication lines of terminals ③ and ④. The PLC controller 13 will use the communication address to make the corresponding light spot representing the interlocking device 1 on the display screen 12 display the corresponding status.

[0026] Operators can visually identify which interlocking device 1 has disengaged via the screen, allowing them to quickly direct on-site personnel to the designated location to restore it.

[0027] The above description is only a preferred embodiment of the present utility model and does not limit the scope of the present utility model. All equivalent changes made based on the content of the present utility model specification and its drawings are included within the scope of the present utility model.

Claims

1. A locking device for a mining scraper conveyor, comprising a housing (7), wherein a locking switch (6) is provided on the surface of the housing (7), characterized in that, The interlocking switch (6) is a double switch with a contact and a contact (b). When the a contact is open, the b contact is opened. The outer walls of the opposite sides of the housing (7) are respectively provided with an inlet (4) and an outlet (5). Inside the housing (7) are an indicator light (3), a power module (8), a communication module (9) and a terminal block (10). Indicator light (3) is mounted on the top of housing (7) to reflect the circuit status; The first output terminal of the power module (8) is connected to the indicator light (3), and the second output terminal is connected to the communication module (9); The terminal block (10) has five connection points from ① to ⑤. Connection points ① and ② are connected to the input terminal of the power module (8) via wires, connection points ③ and ④ are connected to the communication module (9) via wires, and connection point ⑤ is connected to the negative terminal of the a contact of the interlocking switch (6) via wires. The input terminal of the communication module (9) is connected to contact b, and the output terminal is connected to connection point ③ and connection point ④. The cable (11) enters the housing (7) from the inlet (4). It is a five-core cable. The connection points of the two power lines are connected to connection points ① and ②. The connection points of the two signal lines are connected to connection points ③ and ④. The connection point of the control line is connected to the positive terminal of connection point ⑤ and contact a. The cable (11) is connected to the PLC controller (13), and the PLC controller (13) is connected to the monitoring center.

2. The locking device for a mining scraper conveyor according to claim 1, characterized in that: The indicator light (3) is a light-emitting panel with a uniform arrangement of lamp cores in the middle area and a side plate on the outer periphery; the top surface of the outer shell (7) is provided with mounting holes, and a fitting platform is provided on the inner edge of the mounting holes. The lamp core area is embedded in the mounting holes, and the side plate is fixedly connected to the fitting platform by bolts. A sealing gasket is provided between the side plate and the fitting platform.

3. The locking device for a mining scraper conveyor according to claim 1, characterized in that: The light panel can display both red and green light.

4. The locking device for a mining scraper conveyor according to claim 1, characterized in that: The monitoring center is equipped with a display screen (12), which displays the circuit status of each interlocking device (1).

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