Mining flame-proof and intrinsic safety type PLC (Programmable Logic Controller) control box

Abstract

The utility model belongs to the technical field of automatic control equipment for a coal mine, and particularly relates to a mining flame-proof and intrinsic safety type PLC (Programmable Logic Controller) control box, which is applied to automatic integrated control equipment in an underground coal mine and comprises a PLC control box body consisting of an intrinsic safety control box body and a flame-proof box body which are vertically arranged from top to bottom, the intrinsic safety control box body comprises a first base and a cover body; the explosion-proof box body comprises a second seat body, and the second seat body is divided into an explosion-proof power supply cavity and an explosion-proof battery cavity by a partition plate; on the basis that the intrinsic safety control box body and the explosion-proof box body are processed in a split mode, the explosion-proof power source cavity and the explosion-proof battery cavity are processed in a split mode, steel made of SUS304 materials is used for replacing thickened steel plates made of common materials to manufacture the explosion-proof plates, the problem that in the prior art, a PLC control box is heavy is solved, meanwhile, a storage battery is arranged in the PLC control box, and the PLC control box is convenient to use. And power can be supplied to the equipment under the condition that an external power supply is powered off.

Description

Technical Field

[0001] The utility model belongs to the technical field of automatic control equipment for coal mines, in particular to a flameproof and intrinsically safe PLC control box for mines. Background Art

[0002] PLC refers to a programmable logic controller, which is mainly used with various circuit components to form a complete PLC control box. It has the advantages of compact structure, stable operation and complete functions. It can be combined according to the actual control scale. It can realize automatic control of a single cabinet, or multiple cabinets can be connected through industrial Ethernet or industrial field bus network to form a distributed control system (DCS).

[0003] The PLC control box used in coal mines needs to integrate the detection results of multiple sensors and use them to control the corresponding equipment. It is one of the most important devices. Due to the special production conditions in coal mines, the existing PLC control box must be flameproof and waterproof. The existing PLC control box only has an integral flameproof box body. The flameproof treatment is usually that the box body is made of thickened steel plates of ordinary materials or thickened stainless steel. Although such a setting can meet the flameproof requirements, it will make the entire PLC control box too bulky and does not isolate the internal power supply and other equipment. Once a power failure or other problems occur, it will bring safety hazards. In addition, coal mines often need to shut down equipment for maintenance or accidental power outages. For some safety equipment such as dampers, once a power outage occurs, it will cause hidden dangers to the safe production of coal mines. The existing PLC control box cannot still play its control role after a power outage, which is not conducive to the safe production of coal mines. Utility Model Content

[0004] In view of this, the utility model provides a flameproof and intrinsically safe PLC control box for mining. On the basis of separating the intrinsically safe control box body and the flameproof box body, the flameproof power supply cavity and the flameproof battery cavity are also divided, and SUS304 steel is used to replace the thickened steel plate of ordinary material to make the flameproof plate, thereby solving the problem of the bulky PLC control box in the prior art. At the same time, a battery is also arranged in the PLC control box, which can also power the equipment when the external power supply is cut off.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] Mining flameproof and intrinsically safe PLC control box, used in underground coal mine automation integrated control equipment, including:

[0007] The PLC control box body is composed of an intrinsically safe control box body and a flameproof box body arranged vertically from top to bottom, wherein:

[0008] The intrinsically safe control box includes a first base, which is a rectangular box without a cover. Both sides of the first base are provided with a plurality of aviation plugs. The opening of the first base is connected to the cover through a hinge;

[0009] The flameproof box includes a second base body, which is also a rectangular coverless box body, and the second base body is composed of a flameproof panel. On this basis, a vertically arranged partition is provided inside the second base body, and the partition is also a flameproof panel. The partition divides the second base body into two cavities, namely, a flameproof power supply cavity and a flameproof battery cavity. In addition, the second base body is respectively provided with a first cover and a second cover at the opening to match the flameproof power supply cavity and the flameproof battery cavity, and the first cover and the second cover are connected to the second base body by fixing bolts. The first cover and the second cover are also flameproof panels.

[0010] In addition, a group of L-shaped support bases are symmetrically provided on both sides of the flameproof box. The L-shaped support base consists of a vertical portion and a horizontal portion connected in one piece. The vertical portion is connected to the flameproof box, and a fixing groove is provided on the horizontal portion. An anchor bolt is provided inside the fixing groove. On this basis, in the flameproof box, the partition plate is provided with a flameproof through-wall terminal block, and the flameproof through-wall terminal block is also provided on the flameproof plate between the flameproof power supply cavity and the intrinsically safe control box.

[0011] Based on the above structure, the interior of the intrinsically safe control box and the flameproof power supply cavity are both provided with a plurality of circuit elements, and the plurality of circuit elements are electrically connected and electrically connected across the cavity through the flameproof through-wall terminal block. In addition, a battery is provided inside the flameproof battery cavity, and a knob switch is provided on the battery. The knob switch passes through the bottom end of the second base body through a copper sleeve and is placed on the outside of the bottom of the second base body.

[0012] In addition, in the intrinsically safe control box, the first base and the cover are both made of Q235A material; in the explosion-proof box, the explosion-proof plate is made of SUS304 material.

[0013] Preferably, the circuit elements located inside the intrinsically safe control box include a PLC control module, a solid-state relay output circuit board, and an optocoupler isolation input circuit board. The cover is also provided with a touch screen, which is used to display the operation screen of the PLC control box. The optocoupler isolation input circuit board is used to isolate and convert the detection signal of the external sensor equipment, and the PLC control module outputs the control signal to the outside through the solid-state relay output circuit board.

[0014] Furthermore, in the flameproof box, a plurality of A1 type explosion-proof cable entry devices are provided on the side of the flameproof power supply cavity;

[0015] The circuit elements inside the flameproof power supply cavity include a switching power supply module, an intrinsically safe circuit module, and a charging circuit module. The switching power supply module converts the AC127V AC voltage into a DC24V DC voltage, and then powers the intrinsically safe circuit module and the charging circuit module; the charging circuit module uses the flameproof through-wall wiring terminal to power the battery; the intrinsically safe circuit module converts the DC24V DC voltage into an intrinsically safe DC12V DC voltage, and then powers the PLC control module and the touch screen through the flameproof through-wall wiring terminal.

[0016] Preferably, in the intrinsically safe control box, a sealing ring is provided on the cover, and the sealing ring cooperates with the opening of the first base. In addition, a locking buckle is provided on the cover, and the cover is locked to the opening of the first base through the locking buckle.

[0017] More preferably, sealing gaskets are provided between the first cover plate, the second cover plate and the second base.

[0018] Preferably, the dust and water resistance level of the PLC control box body is IP54.

[0019] Preferably, an identification plate is also provided on the first cover plate.

[0020] The beneficial effects of the present invention are:

[0021] In general, the utility model provides a flameproof and intrinsically safe PLC control box for mining, which divides the entire PLC control box into an intrinsically safe control box body and a flameproof box body. The intrinsically safe control box body is made of Q235A material. On the basis of intrinsic safety, it is lighter than materials such as thickened steel plates. On the one hand, the flameproof box body is made of SUS304 steel to replace the thickened steel plates of ordinary materials. On the other hand, it is divided into a flameproof power supply cavity and a flameproof battery cavity by flameproof panels. Such a setting can greatly reduce the use of flameproof materials compared with the PLC control box, achieving a precise flameproof effect while reducing the overall weight of the PLC control box, which is convenient for maintenance and transportation by staff. On this basis, the utility model also arranges a battery in the flameproof battery cavity, which is used to temporarily power ventilation equipment such as dampers when the power is off in the mine, which is beneficial to safe production and reflects the practicality of the utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the utility model;

[0024] Figure 2 This is a side structural diagram of the present utility model;

[0025] Figure 3 This is a partial cross-sectional view of the front structure of the present invention. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the devices or components referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limiting the present invention. The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. In addition, unless otherwise expressly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, they can be fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections, indirect connections through an intermediate medium, or internal connections between two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] The technical solution of the present utility model will be described in detail below with reference to the accompanying drawings.

[0029] In this technical solution, the mine flameproof and intrinsically safe PLC control box is used in the underground automation integrated control equipment of coal mines, such as Figure 1 As shown, the mine flameproof and intrinsically safe PLC control box includes: a PLC control box body composed of an intrinsically safe control box body 1 and a flameproof box body 2 arranged vertically from top to bottom. The PLC control box body is used to carry the necessary circuit components for installing the automation control equipment.

[0030] Among them, Figure 1-2As shown, the intrinsically safe control box 1 includes a first base 101, which is a rectangular box without a cover as a whole. Several aviation plugs 102 are provided on both sides of the first base 101. The opening of the first base 101 is connected to a cover body 104 through a hinge 103. The cover body 104 is also provided with a sealing ring 105, which cooperates with the opening of the first base 101. In addition, the cover body 104 is also provided with a locking buckle, which locks the cover body 104 to the opening of the first base 101 through the locking buckle. In the installed state, the setting of the sealing ring 105 is used for the sealing cooperation between the first base 101 and the cover body 104. On this basis, the first base 101 and the cover body 104 are both made of Q235A material.

[0031] Based on the above embodiment, the use of the aviation plug 102 facilitates the wiring process of the staff and avoids multiple unpacking and wiring. In addition, the intrinsically safe control box 1 is made of Q235A material, which is lighter than materials such as thickened steel plates on the basis of intrinsic safety.

[0032] In this technical solution, if Figure 1-3 As shown, the flameproof box 2 includes a second base 201, which is also a rectangular coverless box, and the second base 201 is composed of a flameproof plate. On this basis, a vertically arranged partition plate 202 is provided inside the second base 201. The partition plate 202 is also a flameproof plate. The partition plate 202 divides the second base 201 into two cavities, namely the flameproof power supply cavity 3 and the flameproof battery cavity 4. In addition, the second base 201 has an opening. The flameproof power supply cavity 3 and the flameproof battery cavity 4 are respectively provided with a first cover plate 203 and a second cover plate 204, and the first cover plate 203 and the second cover plate 204 are connected to the second base body 201 by fixing bolts 205. The first cover plate 203 and the second cover plate 204 are also flameproof plates. Sealing gaskets are provided between the first cover plate 203, the second cover plate 204 and the second base body 201. The sealing gaskets are not shown in the figure. The flameproof plates are made of SUS304.

[0033] Based on the above embodiment, on the one hand, the explosion-proof box body 2 is made of SUS304 steel instead of thickened steel plates of ordinary materials. When the material area remains unchanged, the good plasticity, toughness and corrosion resistance of SUS304 steel are utilized in the mine environment to ensure the explosion-proof and corrosion-resistant performance while reducing the weight of the explosion-proof box body 2; on the other hand, the explosion-proof panel is used to divide it into a explosion-proof power supply cavity 3 and a explosion-proof battery cavity 4. Such a setting can greatly reduce the use of explosion-proof materials compared with the PLC control box as a whole, achieving a precise explosion-proof effect while reducing the overall weight of the PLC control box, which is convenient for staff to inspect and carry; in addition, an identification plate 209 is also provided on the first cover plate 203 for filling in the production date, equipment model, and maintenance time of the PLC control box, which is convenient for staff to check.

[0034] In addition, if Figure 1 As shown, a group of L-shaped support seats are symmetrically provided on both sides of the explosion-proof box 2. The L-shaped support seats are composed of a vertical part 206 and a horizontal part 207 that are connected as one piece. The vertical part 206 is connected to the explosion-proof box 2. A fixing groove 208 is provided on the horizontal part 207. An anchor bolt is provided inside the fixing groove 208. In this application, a group of L-shaped support seats are used to support the entire PLC control box, and the PLC control box is fixed to the ground of the tunnel under the mine through the cooperation of the fixing groove 208 and the anchor bolt. The anchor bolt is not shown in the figure.

[0035] It should also be noted in this application that in the flameproof box 2, if Figure 3 As shown, a flameproof through-wall terminal 5 is provided on the partition plate 202 , and a flameproof through-wall terminal 5 is also provided on the flameproof plate between the flameproof power supply cavity 3 and the intrinsically safe control box 1 .

[0036] Corresponding to the above structure, Figure 3 As shown, a number of circuit elements are provided inside the intrinsically safe control box 1 and the flameproof power supply cavity 3, and the several circuit elements are electrically connected and electrically connected across the cavity through the flameproof wall-through terminal 5; in addition, a number of A1-type explosion-proof cable entry devices 304 are provided on the side of the flameproof power supply cavity 3 for connecting cables to provide power for the PLC control box; a battery 401 is provided inside the flameproof battery cavity 4, and a knob switch 402 is provided on the battery 401. The knob switch 402 passes through the bottom end of the second base body 201 through a copper sleeve 403 and is placed on the outside of the bottom of the second base body 201.

[0037] Specifically, such as Figure 3As shown, the circuit elements located inside the intrinsically safe control box 1 include a PLC control module 106, a solid-state relay output circuit board 107, and an optocoupler isolation input circuit board 108. A touch screen display 109 is also provided on the cover 104, and the touch screen display 109 is used to display the operation screen of the PLC control box; the optocoupler isolation input circuit board 108 is used to isolate and convert the detection signal of the external sensor equipment, and the PLC control module 106 outputs the control signal to the outside through the solid-state relay output circuit board 107.

[0038] In addition, if Figure 3 As shown, the circuit components inside the flameproof power supply cavity 3 include a switching power supply module 301, an intrinsically safe circuit module 302, and a charging circuit module 303. When the external power supply is powered on, the switching power supply module 301 converts the AC127V AC voltage into a DC24V DC voltage, and then supplies power to the intrinsically safe circuit module 302 and the charging circuit module 303; the charging circuit module 303 uses the flameproof through-wall terminal 5 to supply power to the battery 401; the intrinsically safe circuit module 302 converts the DC24V DC voltage into the intrinsically safe DC 12V DC voltage, and then power the PLC control module 106 and the touch display screen 109 through the flameproof wall-through terminal 5; when the external power supply is cut off, the battery 401 powers the intrinsically safe circuit module 302 through the diode, and the intrinsically safe circuit module 302 converts the DC21.9V DC voltage of the battery 401 into an intrinsically safe DC12V DC voltage, and then power the PLC control module 106 and the touch display screen 109 through the flameproof wall-through terminal 5; the diode is a common device in the circuit to prevent current reverse flow.

[0039] Based on the above embodiments, the facilities in the explosion-proof box 2 of this application all adopt an explosion-proof design. The use of explosion-proof wall-penetrating terminal 5 and explosion-proof plate reduces the risk of explosion failure of the explosion-proof box 2 to a minimum, reflecting the practicality of the present invention. In addition, the present invention also arranges a battery 401 in the explosion-proof battery cavity 4, which is used to temporarily power ventilation equipment such as dampers when the power is cut off in the mine, which is beneficial to safe production. On this basis, the setting of the knob switch 402 is used to conveniently control the on and off state of the battery 401, that is, when the PLC control box is transported, the knob switch 402 is used to cut off the electrical connection between the battery 401 and the circuit elements in the PLC control box to prevent power loss. When the PLC control box is installed and used, the battery 401 is connected to the circuit elements in the PLC control box, and power supply is started when the external power is cut off; and the copper sleeve 403 matched with the knob switch 402 also provides protection for the explosion-proof effect of the explosion-proof battery cavity 4 to prevent damage to the battery 401.

[0040] In addition, the external sensor equipment mentioned in this application is a necessary facility for the automatic control equipment in the mine, and can be connected to the PLC control box through the aviation plug 102. On this basis, the dust and water resistance level of the PLC control box body is IP54, which is mainly reflected in the setting of the sealing ring 105 and the sealing gasket. The characteristics of the aviation plug 102 and the A1 type explosion-proof cable introduction device 304 themselves have no effect on the IP54 level sealing effect of the PLC control box body.

[0041] Specifically, the utility model provides a flameproof and intrinsically safe PLC control box for mining, which divides the entire PLC control box into an intrinsically safe control box body 1 and a flameproof box body 2 and arranges them in an upper and lower structure, with the flameproof box body 2 located on the lower layer and the intrinsically safe control box body 1 located on the upper layer. The intrinsically safe control box body 1 is made of Q235A material, which is lighter than materials such as thickened steel plates on the basis of intrinsic safety. The flameproof box body 2 is made of SUS304 steel instead of thickened steel plates of ordinary materials on the one hand, and is divided into a flameproof power supply cavity 3 and a flameproof battery cavity 4 by flameproof panels on the other hand. Such a setting can greatly reduce the use of flameproof materials compared to the PLC control box, achieving precise flameproof effect while reducing the overall weight of the PLC control box, making it convenient for staff to inspect and carry.

[0042] On this basis, the utility model also sets a battery 401 in the flameproof battery cavity 4, and uses a knob switch 402 to temporarily power ventilation equipment such as dampers when there is a power outage in the mine, which is beneficial to safe production and reflects the practicality of the utility model.

[0043] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. The mine flameproof and intrinsically safe PLC control box is used in the underground automation integrated control equipment of coal mines. It is characterized by: include: The PLC control box body is composed of an intrinsically safe control box body and a flameproof box body arranged vertically from top to bottom, wherein: The intrinsically safe control box includes a first base, which is a rectangular box without a cover. Both sides of the first base are provided with a plurality of aviation plugs. The opening of the first base is connected to the cover through a hinge; The flameproof box includes a second base body, which is also a rectangular coverless box body, and the second base body is composed of a flameproof panel. On this basis, a vertically arranged partition is provided inside the second base body, and the partition is also a flameproof panel. The partition divides the second base body into two cavities, namely, a flameproof power supply cavity and a flameproof battery cavity. In addition, the second base body is respectively provided with a first cover and a second cover at the opening to match the flameproof power supply cavity and the flameproof battery cavity, and the first cover and the second cover are connected to the second base body by fixing bolts. The first cover and the second cover are also flameproof panels. In addition, a group of L-shaped support bases are symmetrically provided on both sides of the flameproof box. The L-shaped support base consists of a vertical portion and a horizontal portion connected in one piece. The vertical portion is connected to the flameproof box, and a fixing groove is provided on the horizontal portion. An anchor bolt is provided inside the fixing groove. On this basis, in the flameproof box, the partition plate is provided with a flameproof through-wall terminal block, and the flameproof through-wall terminal block is also provided on the flameproof plate between the flameproof power supply cavity and the intrinsically safe control box. Based on the above structure, the interior of the intrinsically safe control box and the flameproof power supply cavity are both provided with a plurality of circuit elements, and the plurality of circuit elements are electrically connected and electrically connected across the cavity through the flameproof through-wall terminal block. In addition, a battery is provided inside the flameproof battery cavity, and a knob switch is provided on the battery. The knob switch passes through the bottom end of the second base body through a copper sleeve and is placed on the outside of the bottom of the second base body. In addition, in the intrinsically safe control box, the first base and the cover are both made of Q235A material; in the explosion-proof box, the explosion-proof plate is made of SUS304 material.

2. The flameproof and intrinsically safe PLC control box for mining according to claim 1 is characterized in that: The circuit elements located inside the intrinsically safe control box include a PLC control module, a solid-state relay output circuit board, and an optocoupler isolation input circuit board. The cover is also provided with a touch screen, which is used to display the operation screen of the PLC control box. The optocoupler isolation input circuit board is used to isolate and convert the detection signals of external sensor equipment, and the PLC control module outputs the control signal to the outside through the solid-state relay output circuit board.

3. The flameproof and intrinsically safe PLC control box for mining according to claim 2 is characterized in that: In the flameproof box, a plurality of A1 type explosion-proof cable entry devices are provided on the side of the flameproof power supply cavity; The circuit elements inside the flameproof power supply cavity include a switching power supply module, an intrinsically safe circuit module, and a charging circuit module. The switching power supply module converts the AC127V AC voltage into a DC24V DC voltage, and then powers the intrinsically safe circuit module and the charging circuit module; the charging circuit module uses the flameproof through-wall wiring terminal to power the battery; the intrinsically safe circuit module converts the DC24V DC voltage into an intrinsically safe DC12V DC voltage, and then powers the PLC control module and the touch screen through the flameproof through-wall wiring terminal.

4. The flameproof and intrinsically safe PLC control box for mining according to claim 3 is characterized by: In the intrinsically safe control box, a sealing ring is provided on the cover, and the sealing ring cooperates with the opening of the first base. In addition, a locking buckle is provided on the cover, and the cover is locked and fastened to the opening of the first base through the locking buckle.

5. The flameproof and intrinsically safe PLC control box for mining according to claim 4 is characterized in that: Sealing gaskets are provided between the first cover plate, the second cover plate and the second base body.

6. The flameproof and intrinsically safe PLC control box for mining according to claim 5 is characterized by: The dust and water resistance level of the PLC control box body is IP54.

7. The flameproof and intrinsically safe PLC control box for mining according to claim 1 is characterized by: The first cover plate is also provided with an identification plate.

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