Manual unlocking circuit and unlocking method for airborne and vehicle-mounted methane breaker

Abstract

The invention relates to a manual unlocking circuit and an unlocking method for airborne and vehicle-mounted methane power-off instruments, and belongs to the field of coal mine safety. The invention discloses a non-contact unlocking circuit and unlocking method based on a reed switch and a strong magnet. According to the scheme, the non-explosion-proof shell design is adopted, the explosion-proof type is simplified, the size and the weight of equipment are reduced, and installation and maintenance are convenient. Meanwhile, through non-contact connection of the reed switch and the magnet, unlocking can be carried out when the equipment is powered off or breaks down, and the use convenience is improved. In addition, the anti-cheating function is achieved, when the manual unlocking tool is located at the unlocking position for a long time, an alarm signal can be sent out, a manual unlocking control loop is disconnected, the risk of manual cheating is avoided, meanwhile, it can be ensured that equipment can be normally powered off under the condition that methane exceeds the limit, and coal mine production safety is effectively guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of coal mine safety and relates to a manual unlocking circuit and unlocking method of an airborne and vehicle-mounted methane power-off instrument. Background Art

[0002] Article 539 of the "Safety Regulations for Coal Mines" stipulates that coal mining machines, tunneling machines, integrated mining and anchoring machines, continuous coal mining machines, etc. must be equipped with a methane power-off device with a power-off locking function; shuttle cars, anchor drilling vehicles, and transportation equipment that use explosion-proof batteries or explosion-proof diesel engines as power units must be equipped with a methane power-off device with a power-off locking function (hereinafter referred to as a power-off device) or a portable methane detection alarm.

[0003] A power-off meter is a device or apparatus for monitoring the concentration of methane gas. It is installed on coal mining, tunneling, drilling machinery and other equipment in coal mines. It can automatically and continuously monitor the methane concentration around the equipment. When the concentration exceeds the preset alarm point, it will send out an audible and visual alarm signal. When the concentration exceeds the preset power-off point, it can output a power-off signal and automatically cut off the power supply to the equipment to ensure safe production. When the methane concentration falls back below the alarm point or the power-on point, the alarm can be lifted or the device can be automatically unlocked.

[0004] The coal industry standards "MT / T 282-94 General Technical Conditions for Mobile Methane Power Cutoff Devices for Coal Mines" and "MT / T1101-2009 Vehicle-mounted Methane Power Cutoff Devices for Mines" clearly stipulate that after the power cutoff device is powered off, it is in a locked state and must be manually unlocked using special tools.

[0005] like Figure 1 As shown, the manual unlocking operation of the onboard or vehicle-mounted methane power cut-off device is mainly achieved through a knob or a remote control.

[0006] 1) Knob unlock

[0007] The knob unlocking is mainly done by manually rotating the knob. When the breaker outputs a power-off signal, the knob is manually rotated to short-circuit the power-off signal, and then a power-on signal can be output to unlock the controlled device.

[0008] The knob unlocking is mainly composed of a knob, a connecting rod, a switch contact, etc. When the knob is rotated, the connecting rod drives the switch contact in the flameproof casing of the power cutter to rotate, thereby closing or opening the contact.

[0009] 2) Remote control unlock

[0010] Remote control unlocking mainly uses a wireless remote control such as infrared or Bluetooth to control the power-off control relay of the power-off instrument to perform the unlocking operation. When the power-off instrument outputs the power-off contact, operate the remote control. After the power-off instrument receives the remote control signal, it flips the relay contact to achieve manual unlocking.

[0011] The existing coal mine safety monitoring system has relatively mature functions, but has the following disadvantages:

[0012] 1) The power-off device using the knob unlocking method needs to be designed as a flameproof type. A copper sleeve is installed between the knob connecting rod and the flameproof cavity inside the equipment to form a flameproof surface to ensure safety. After the product is formed, it is large in size and heavy in weight, which is not conducive to on-site installation and maintenance;

[0013] 2) The knob unlocking method can be used to cheat and keep the power-off instrument in the unlocked position. When the knob is always in the manual unlocking position, the power-off contact is always in the connected state. Therefore, the power cannot be cut off when the methane exceeds the limit or other conditions, which poses a safety hazard;

[0014] 3) When using the remote control unlocking method, the device must be powered and in normal working state. When the device is powered off or the device fails, manual unlocking operation cannot be performed, which is inconvenient for on-site use.

[0015] This scheme analyzes the principles and shortcomings of manual unlocking of existing airborne or vehicle-mounted methane power-off devices, and proposes a simple and easy-to-use unlocking circuit and unlocking method to improve the shortcomings of the complex design of the manual unlocking mechanism of the power-off device and the possibility of cheating in manual unlocking. Summary of the invention

[0016] In view of this, an object of the present invention is to provide a manual unlocking circuit and unlocking method for an airborne and vehicle-mounted methane power cut-off instrument.

[0017] In order to achieve the above object, the present invention provides the following technical solutions:

[0018] A manual unlocking circuit for an airborne and vehicle-mounted methane power-off instrument, comprising:

[0019] at least one magnetic latching relay K2 having a closing contact and an opening contact;

[0020] at least one common relay K1 having a normally closed contact;

[0021] At least one reed switch S1 connected in series with the normally closed contact of K1 and in parallel with the open contact of K2;

[0022] At least one reed switch S2 for detecting whether the manual unlocking tool is in the unlocking state for a long time;

[0023] The control unit is used to control the closing and opening of K2 according to the detected methane concentration, and to control the closing and opening of K1 according to the switch state of S2, and to send out an alarm signal.

[0024] Further, the manual unlocking tool comprises:

[0025] At least one remote controller for remotely controlling the closing and opening of K2;

[0026] At least one permanent magnet is used to control the closing of K1 when the power-off device is in the power-off state.

[0027] A method for manually unlocking an airborne or vehicle-mounted methane power-off instrument comprises the following steps:

[0028] Control the closing and opening of K2 according to the detected methane concentration to realize power off and power on of the controlled equipment;

[0029] Detect the switch state of S2. When S2 is in the closed state, control the normally closed contact of K1 to open. When the methane exceeds the limit, control the open contact of K2 to open, so as to cut off the power supply to the controlled equipment.

[0030] When manual unlocking is required, use the manual unlocking tool to control the closing of K1 or K2 to restore power to the controlled device;

[0031] When the equipment works normally and the manual unlocking tool is in the unlocking position for more than a certain time, an alarm signal is issued.

[0032] The beneficial effects of the present invention are:

[0033] 1) The contactless unlocking method of reed switch + strong magnet is adopted, so that the explosion-proof type of the power cutter can be designed as a non-explosion-proof type. The non-explosion-proof shell is adopted, which greatly reduces the volume and weight of the equipment, and the product is easy to install and maintain;

[0034] 2) It has a manual unlocking anti-cheating function. When the manual unlocking tool is always in the unlocking position, an alarm signal can be issued and the manual unlocking control circuit can be disconnected. When the methane exceeds the limit, the power-off instrument can normally control the power-off of the controlled equipment, avoiding the defect of power-off failure of the controlled equipment caused by the equipment being in the manual unlocking position when working normally.

[0035] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and to some extent, will be obvious to those skilled in the art based on the following examination and study, or can be taught from the practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be described in detail below in conjunction with the accompanying drawings, wherein:

[0037] Figure 1 Unlock the structure diagram for the knob;

[0038] Figure 2This is the normal working state of the manual unlocking method using a reed switch;

[0039] Figure 3 It is the manual unlocking state after power failure of the manual unlocking method using a reed switch. DETAILED DESCRIPTION

[0040] The following describes the embodiments of the present invention by specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that the illustrations provided in the following embodiments only illustrate the basic concept of the present invention in a schematic manner, and the following embodiments and features in the embodiments can be combined with each other without conflict.

[0041] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on the present invention. In order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of actual products. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0042] The same or similar numbers in the drawings of the embodiments of the present invention correspond to the same or similar parts; in the description of the present invention, it should be understood that if the terms "upper", "lower", "left", "right", "front", "rear", etc. indicate the orientation or position relationship, they are based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the terms describing the position relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] The present invention belongs to the field of coal mine safety monitoring system and coal mine electronic technology, and proposes a manual unlocking circuit and unlocking method for airborne and vehicle-mounted methane power-off instruments. A non-contact unlocking method using a reed switch + magnet is adopted. When the power-off instrument controls the controlled equipment to be powered off, a special unlocking tool made of a magnet can be used to unlock the power-off instrument and restore the power supply to the controlled equipment.

[0044] The functional block diagram of the trusted power-off control method based on real-time hierarchical control is as follows: Figure 2 and Figure 3As shown. K1 is the normally closed contact of a common relay, K2 is the disconnect contact of a magnetic latching relay, and S1 and S2 are reed switches. The normally closed contact of K1 and the reed switch S1 are connected in series to form a manual unlocking control contact, which is connected in parallel at both ends of the contact of K2. S2 is a manual unlocking state detection switch, which is used to detect whether the manual unlocking tool is in the unlocking state for a long time, so as to avoid the controlled equipment from being powered off due to being in the manual unlocking state during normal operation.

[0045] When the power-off instrument works normally, K2 is closed, K1 and S1 are disconnected, and the output NO+ / NO- closed contacts connect the controlled equipment.

[0046] When the power-off instrument detects that methane exceeds the limit, it controls the K2 contact to disconnect, and the output NO+ / NO- contacts will cut off the power to the controlled equipment. At the same time, the power supply of the power-off instrument itself is disconnected, K1 is closed due to the loss of power to the relay, and K2 remains in the disconnected state because it is a magnetic holding relay contact.

[0047] When the circuit breaker needs to be manually unlocked in the power-off state, a special unlocking tool is used to unlock it. This manual unlocking tool is in the form of a remote control + permanent magnet. The remote control can be used for manual unlocking when the circuit breaker is powered on, and the permanent magnet is used for manual unlocking when the circuit breaker is powered off. When the permanent magnet of the unlocking tool approaches the reed switch S1, S1 is closed. Since K2 is automatically closed, the output NO+ / NO- closed contacts are connected to the controlled device to achieve manual unlocking.

[0048] After the power-off instrument is manually unlocked, power is supplied, the power-off instrument works normally, the single-chip microcomputer inside the power-off instrument controls the K2 relay contacts to close, and the controlled equipment is powered on. When the manual unlocking tool is in the manual unlocking position, S2 is closed at the same time, and JSJC outputs a high level. When the single-chip microcomputer inside the power-off instrument detects that S2 has been closed, that is, the manual unlocking tool has been in the unlocking position, it can send out an alarm signal and control the normally closed contact of the K1 relay to disconnect. When the manual unlocking circuit is disconnected, when methane exceeds the limit, the power-off instrument can normally control the K2 relay contacts to disconnect, and the controlled equipment is powered off, avoiding the defect of being unable to cut off the power due to methane exceeding the limit due to cheating in manual unlocking.

[0049] The present invention proposes a novel manual unlocking circuit and unlocking method, which adopts a non-contact, non-electrical unlocking method, which is simple and reliable. The manual unlocking circuit in this scheme adopts a reed switch as a control switch, and other non-contact switches can also be used to control the on and off of the manual unlocking circuit.

[0050] Embodiment 1

[0051] The manual unlocking circuit of the airborne and vehicle-mounted methane power-off instrument of this embodiment includes:

[0052] Magnetic holding type relay K2: It has a closing contact and an opening contact.

[0053] Ordinary relay K1: It has normally closed contacts.

[0054] Reed switch S1: It is connected in series with the normally closed contact of K1 and in parallel with the open contact of K2.

[0055] Switch S2: used to detect whether the manual unlocking tool is in the unlocking state for a long time.

[0056] Control unit: used to control the closing and opening of K2 according to the detected methane concentration, and to control the closing and opening of K1 according to the switch state of S2, and to send out an alarm signal.

[0057] Manual unlocking tools include:

[0058] Remote controller: used to remotely control the closing and opening of K2.

[0059] Permanent magnet: used to control the closing of K1 when the power-off device is in the power-off state.

[0060] Working principle:

[0061] Normal operation: When the power-off instrument detects that the methane concentration is lower than the preset value, the control unit controls K2 to close and outputs NO+ / NO- closed contacts to connect the controlled equipment.

[0062] Power off: When the power off instrument detects that the methane concentration exceeds the preset value, the control unit controls K2 to disconnect, and the output NO+ / NO- contacts will cut off the power of the controlled equipment. At the same time, the power supply of the power off instrument itself is disconnected, K1 is closed due to the loss of power to the relay, and K2 remains in the disconnected state because it is a magnetic holding relay contact.

[0063] Manual unlocking: When the circuit breaker needs to be manually unlocked in the power-off state, it can be unlocked using a remote control or a permanent magnet.

[0064] Remote control unlocking: The remote control sends a signal to control K2 to close, thereby restoring power to the controlled device.

[0065] Permanent magnet unlocking: Place the permanent magnet close to the reed switch S1 to close S1. Since K2 is automatically closed, the output NO+ / NO- closed contacts connect the controlled device to achieve manual unlocking.

[0066] Anti-cheating: When the manual unlocking tool is in the unlocking position, switch S2 is closed. The control unit detects that S2 has been in the closed state, then it sends out an alarm signal and controls the normally closed contacts of the K1 relay to open. When the manual unlocking circuit is disconnected, when methane exceeds the limit, the power-off instrument can normally control the K2 relay contacts to open, and the controlled equipment is powered off, avoiding the defect of being unable to cut off the power due to methane exceeding the limit caused by manual unlocking cheating.

[0067] Embodiment 2

[0068] This embodiment is basically the same as the first embodiment, except that:

[0069] The manual unlocking tool uses only permanent magnets and no remote control.

[0070] Working principle:

[0071] When the power-off instrument detects that the methane concentration is lower than the preset value, the control unit controls K2 to close and outputs NO+ / NO- closed contacts to connect the controlled equipment.

[0072] When the power-off instrument detects that the methane concentration exceeds the preset value, the control unit controls K2 to disconnect, and the output NO+ / NO- contacts cut off the power to the controlled equipment. At the same time, the power supply of the power-off instrument itself is disconnected, K1 is closed due to the loss of power to the relay, and K2 remains in the disconnected state because it is a magnetic holding relay contact.

[0073] When the breaker needs to be manually unlocked in the power-off state, use a permanent magnet to approach the reed switch S1 to close S1. Since K2 has been automatically closed, the output NO+ / NO- closed contacts connect the controlled device to achieve manual unlocking.

[0074] When the manual unlocking tool is in the unlocking position, switch S2 is closed. The control unit detects that S2 has been in the closed state, then it sends out an alarm signal and controls the normally closed contacts of the K1 relay to open. When the manual unlocking circuit is disconnected, when methane exceeds the limit, the power-off instrument can normally control the K2 relay contacts to open, and the controlled equipment is powered off, thus avoiding the defect of being unable to cut off the power due to methane exceeding the limit caused by cheating in manual unlocking.

[0075] Embodiment 3

[0076] This embodiment is basically the same as the first embodiment, except that:

[0077] The control unit adopts a single chip microcomputer and has data storage and communication functions.

[0078] Working principle:

[0079] When the power-off instrument detects that the methane concentration is lower than the preset value, the single-chip microcomputer controls K2 to close and outputs NO+ / NO- closed contacts to connect the controlled equipment.

[0080] When the power-off instrument detects that the methane concentration exceeds the preset value, the single-chip microcomputer controls K2 to disconnect, and the output NO+ / NO- contacts cut off the power to the controlled equipment. At the same time, the power supply of the power-off instrument itself is disconnected, K1 is closed due to the loss of power to the relay, and K2 remains in the disconnected state because it is a magnetic holding relay contact.

[0081] When the circuit breaker needs to be manually unlocked when it is in the power-off state, it can be unlocked using a remote control or a permanent magnet.

[0082] When the manual unlocking tool is in the unlocking position, the single-chip microcomputer detects that S2 has been in the closed state, and then sends out an alarm signal and controls the normally closed contacts of the K1 relay to open. When the manual unlocking circuit is disconnected, when methane exceeds the limit, the single-chip microcomputer can normally control the K2 relay contacts to open, and the controlled equipment is powered off, avoiding the defect of being unable to cut off the power due to methane exceeding the limit due to cheating in manual unlocking.

[0083] The single chip microcomputer stores the working status of the power-off instrument, unlocking records and other information in the memory, and can exchange data with the host computer through the communication interface.

[0084] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the present invention.

Claims

1. A manual unlocking circuit for an airborne and vehicle-mounted methane power-off instrument, Features: include: at least one magnetic latching relay K2 having a closing contact and an opening contact; at least one common relay K1 having a normally closed contact; At least one reed switch S1 connected in series with the normally closed contact of K1 and in parallel with the open contact of K2; At least one reed switch S2 for detecting whether the manual unlocking tool is in the unlocking state for a long time; The control unit is used to control the closing and opening of K2 according to the detected methane concentration, and to control the closing and opening of K1 according to the switch state of S2, and to send out an alarm signal.

2. The manual unlocking circuit of the airborne and vehicle-mounted methane power cut-off device according to claim 1, Features: The manual unlocking tool comprises: At least one remote controller for remotely controlling the closing and opening of K2; At least one permanent magnet is used to control the closing of K1 when the power-off device is in the power-off state.

3. A method for manually unlocking an airborne or vehicle-mounted methane power-off instrument. Features: The following steps are involved: Control the closing and opening of K2 according to the detected methane concentration to realize power off and power on of the controlled equipment; Detect the switch state of S2. When S2 is in the closed state, control the normally closed contact of K1 to open. When the methane exceeds the limit, control the open contact of K2 to open, so as to cut off the power supply to the controlled equipment. When manual unlocking is required, use the manual unlocking tool to control the closing of K1 or K2 to restore power to the controlled device; When the equipment works normally and the manual unlocking tool is in the unlocking position for more than a certain time, an alarm signal is issued.

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