Underground remote control frequency conversion cabinet for mining elevator

Abstract

The invention relates to the technical field of frequency conversion cabinets, in particular to an underground remote control frequency conversion cabinet for a mining elevator. The device comprises a cabinet body and a gas injection module used for injecting carbon monoxide gas, and a plurality of layers of placing jigs used for placing carbon monoxide alarms to be detected are arranged in the cabinet body. According to the device, the calibrated toxic gas is adsorbed and purified through the honeycomb-shaped activated carbon, the harm to the underground environment and the health of operators caused by direct emission of carbon monoxide is avoided, and the adsorbed harmful gas can be subjected to secondary treatment after being desorbed through the electrode plate; the arrangement of the filter screen effectively intercepts impurities in gas, prevents the impurities from blocking pores of the activated carbon, prolongs the service life of the honeycomb-shaped activated carbon, reduces the replacement frequency of consumables, and meanwhile, due to a quick disassembly structure consisting of the clamping groove body, the cross-shaped clamping body, the pushing column and the auxiliary spring body, an operator does not need to disassemble a large number of fixing parts, and the cost is reduced. The maintenance process is greatly simplified, and the maintenance time and the labor cost are saved.

Description

Technical Field

[0001] This invention relates to the field of frequency converter cabinet technology, and more specifically, to a remote control frequency converter cabinet for underground mining elevators. Background Technology

[0002] Mining elevators, as core equipment for transporting personnel and materials underground, operate in environments with significant uniqueness and complexity. Underground spaces are enclosed, with high humidity, high dust concentrations, and are prone to the presence of corrosive and flammable / explosive gases such as hydrogen sulfide and methane. These factors not only threaten the safe operation of the mining elevators themselves but also pose potential risks to the lives of underground personnel. Carbon monoxide, a common toxic gas underground, is generated through various pathways, including incomplete combustion due to equipment malfunctions, spontaneous combustion and oxidation of coal, and residual gases after blasting operations. Once the carbon monoxide concentration exceeds the safety threshold, it can rapidly cause poisoning and even endanger lives. Therefore, mining elevators must be equipped with high-precision carbon monoxide alarms to monitor gas concentrations in real time and issue timely warnings, forming the first line of defense for underground operational safety.

[0003] Existing devices often use fixed fixtures for placing alarms to be calibrated. Operators must penetrate deep into the cabinet to retrieve or place the alarms, which is inconvenient. Furthermore, fixed fixtures cannot guarantee that multiple alarms are in identical gas contact environments. Some alarms may be exposed to high-concentration gases due to their proximity to the gas inlet, while others may be exposed to low-concentration gases due to their distance. This results in inconsistent calibration conditions and poor consistency of calibration results, making it impossible to accurately determine the actual detection accuracy of each alarm. Regarding gas flow control, existing devices often use fixed-speed exhaust fans, which cannot adjust the fan speed according to the gas distribution inside the cabinet. This easily leads to uneven local gas concentrations, such as gas stagnation in cabinet corners, further affecting calibration accuracy. Summary of the Invention

[0004] This invention provides a remote control frequency converter cabinet for underground mining elevators to solve the problems mentioned in the background art. To achieve the above objectives, the remote control frequency converter cabinet for underground mining elevators includes a cabinet body and a gas injection module for injecting carbon monoxide gas. The cabinet body is equipped with multiple layers of fixtures for placing carbon monoxide alarms to be tested. These fixtures are multi-layered and pull-out connected to the inner cavity of the cabinet. A main control panel electrically connected to the gas injection module is located on the top of the cabinet body. An exhaust fan is located on the side of the fixtures away from the cabinet door, and the exhaust fan is fixedly connected to the inner panel of the cabinet body, corresponding to the number of layers of the fixtures. The gas injection module can accurately inject carbon monoxide, providing a stable gas source that meets the testing requirements for alarm calibration. The multi-layer pull-out fixtures not only facilitate operators in placing and removing alarms to be tested without having to go deep into the cabinet, but also allow for the simultaneous calibration of multiple alarms, improving testing efficiency. Furthermore, the pull-out design facilitates subsequent maintenance.

[0005] According to one embodiment of the present invention, a positioning plate is attached to the side of the exhaust fan away from the placement fixture. A device carrier is fixedly connected inside the positioning plate, and honeycomb activated carbon is fixedly connected inside the device carrier. The honeycomb activated carbon is made of a conductive material. An electrode plate is fixedly connected to the outside of the device carrier. The electrode plate is electrically connected to the main control panel. Two electrode plates are symmetrically arranged about the vertical axis of the device carrier. The symmetrically arranged electrode plates are electrically connected to the main control panel. When energized, the harmful gases adsorbed by the activated carbon can be desorbed, facilitating secondary treatment. The symmetrical layout ensures uniform heating and more stable desorption effect, eliminating the need for frequent replacement of activated carbon and reducing consumable costs.

[0006] According to one embodiment of the present invention, a filter screen for intercepting particulate matter and high molecular weight impurities is fixedly connected to one end of the device carrier near the exhaust fan. The filter screen is made of fiber material. The fiber material filter screen can accurately intercept particulate matter in the gas, effectively maintain the adsorption capacity of activated carbon, and extend the service life of activated carbon. At the same time, it reduces the ineffective consumption of activated carbon caused by the accumulation of impurities, reduces the frequency of consumable replacement, reduces the number of maintenance times, and the fiber material is low in cost and easy to replace, which is suitable for the complex maintenance needs downhole.

[0007] According to one embodiment of the present invention, the positioning plate has cylindrical cavities at each of the four corners of the side near the device carrier. A snap-fit ​​groove is fixedly connected inside the cylindrical cavity. The snap-fit ​​groove has an inner cavity, and a straight groove is formed in the middle of the side near the positioning plate, which communicates with the inner cavity. The straight groove facilitates the quick insertion of the cross snap-fit ​​body, and the inner cavity achieves snap-fit ​​fixation without the need for bolts or other fixing components. This lays the foundation for the quick assembly and disassembly of the device carrier, greatly simplifies the subsequent process of replacing activated carbon or filter screen, and saves downhole maintenance time.

[0008] According to one embodiment of the present invention, at the four corners of the positioning plate that are parallel to the column cavity, a bonding plate is fixedly connected, and a column shell is fixedly connected to the side of the bonding plate away from the snap-fit ​​groove. The column shell wraps around the outside of the bonding plate, which can effectively block the entry of impurities such as dust and water vapor in the well, protect the internal push column, auxiliary spring and other components, prevent the components from rusting or jamming, extend the service life of these vulnerable components, reduce the probability of equipment failure, and adapt to the harsh environment of humid and dusty downhole.

[0009] According to one embodiment of the present invention, a push post is slidably connected inside the bonding plate, and a cross-shaped snap-fit ​​body is fixedly connected to one end of the push post near the bonding plate. An auxiliary spring body is slidably sleeved on the outer ring of the push post, and both ends of the auxiliary spring body are fixedly connected to the push post and the cross-shaped snap-fit ​​body, respectively. The cross-shaped snap-fit ​​body can precisely fit with the snap-fit ​​groove, and is firmly fixed after snap-fit ​​to prevent the device carrier from loosening. The auxiliary spring body is fixed at both ends, stores elastic potential energy when compressed, and can make the cross-shaped snap-fit ​​body and the inner cavity of the snap-fit ​​groove tightly fit when restored to avoid loosening. Moreover, no additional tools are required, and it can be operated by simply pushing, pulling, and rotating the push post, which greatly saves maintenance manpower and time.

[0010] According to one embodiment of the present invention, a through groove is provided in the middle of the bonding plate, the push post is composed of a post body and a knob, and the cross-shaped snap-fit ​​body is snapped into the inner cavity of the snap-fit ​​groove body; the through groove of the bonding plate provides a smooth sliding channel for the push post, ensuring that the push post moves without obstruction and improving the efficiency of disassembly and assembly.

[0011] According to one embodiment of the present invention, the cabinet is provided with a frequency conversion mechanism, the frequency conversion mechanism includes a frequency converter fixedly connected inside the cabinet, the motor used by the exhaust fan is a frequency conversion motor, and the frequency conversion motor is electrically connected to the frequency converter; the frequency converter can precisely adjust the output frequency, thereby controlling the speed of the frequency conversion motor, realizing stepless adjustment of the exhaust fan air volume, and can dynamically adapt the air volume according to the gas concentration inside the cabinet, ensuring uniform gas concentration on each floor and improving the calibration accuracy of the alarm.

[0012] According to one embodiment of the present invention, the cabinet is provided with a frequency conversion mechanism, which includes a frequency converter fixedly connected inside the cabinet, a frequency conversion motor adapted to the exhaust fan, and a speed sensor; the exhaust fan is driven by the frequency conversion motor, and the frequency conversion motor is electrically connected to the frequency converter.

[0013] According to one embodiment of the present invention, the frequency converter can control the speed of the variable frequency motor in the range of 500-3000 r / min by changing the output frequency; the speed sensor is electrically connected to the main control panel and is used to collect the speed data of the variable frequency motor in real time and transmit it to the main control panel. The main control panel can compare the actual speed with the target speed, and finely adjust the output frequency of the frequency converter when the deviation exceeds ±%.

[0014] According to one embodiment of the present invention, a carbon monoxide sensor is fixedly installed inside the cabinet, and the carbon monoxide sensor is electrically connected to the main control panel; the carbon monoxide sensor is used to monitor the concentration of carbon monoxide gas inside the cabinet in real time and to feed back the concentration monitoring data to the main control panel.

[0015] Compared with existing technologies, this invention uses honeycomb activated carbon to adsorb and purify calibrated toxic gases, avoiding the harm to the downhole environment and operator health caused by direct carbon monoxide emissions. Furthermore, the heating and desorption function of the electrode plate allows for secondary treatment of the adsorbed harmful gases after desorption. The filter effectively intercepts impurities in the gas, preventing them from clogging the activated carbon pores, extending the service life of the honeycomb activated carbon, and reducing the frequency of consumable replacement. The quick-disassembly structure, composed of a snap-fit ​​groove, a cross snap-fit ​​body, a push column, and an auxiliary spring, allows operators to disassemble the device carrier simply by rotating and pulling the push column, eliminating the need to disassemble numerous fixed components. This facilitates convenient replacement of the honeycomb activated carbon or filter, significantly simplifying the maintenance process, saving maintenance time and labor costs, and substantially improving equipment maintenance efficiency. It better adapts to the rapid maintenance needs of complex downhole environments. Attached Figure Description

[0016] Figure 1 This is a structural diagram of the present invention;

[0017] Figure 2 This is an internal structural view of the cabinet of the present invention;

[0018] Figure 3 This is a structural diagram of the cabinet from the rear view angle of the present invention;

[0019] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0020] Figure 5 This is a partial disassembly diagram of the present invention;

[0021] Figure 6 This is a partially dissected structural diagram of the present invention;

[0022] Figure 7 This is a partial structural diagram of the present invention;

[0023] Figure 8 This is a flowchart illustrating the frequency converter controlling the rotation frequency of the exhaust fan in this invention.

[0024] The meanings of the labels in the diagram are as follows:

[0025] 1. Cabinet; 2. Gas injection module; 3. Fixture; 4. Main control panel; 5. Exhaust fan; 6. Positioning plate; 7. Device carrier; 8. Honeycomb activated carbon; 9. Electrode plate; 10. Filter screen; 11. Column cavity; 12. Snap-fit ​​groove; 13. Adhesive plate; 14. Column shell; 15. Cross snap-fit ​​body; 16. Push column; 17. Auxiliary spring body; 18. Frequency converter. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] To address the issues mentioned in the technical solution, see [link / reference]. Figure 1 - Figure 3 As shown, this embodiment of the invention provides a remote control frequency converter cabinet for a mining elevator, including a cabinet 1 and a gas injection module 2 for injecting carbon monoxide gas. The cabinet 1 is provided with multiple layers of placement fixtures 3 for placing carbon monoxide alarms to be detected. The placement fixtures 3 are provided with multiple layers and are pulled out and connected to the inner cavity of the cabinet 1.

[0028] The top of the cabinet 1 is equipped with a main control panel 4 that is electrically connected to the gas injection module 2. The side of the fixture 3 away from the cabinet door of the cabinet 1 is equipped with an exhaust fan 5. The exhaust fan 5 is fixedly connected to the inner panel of the cabinet 1 and is set in accordance with the number of layers of the fixture 3.

[0029] Among them, cabinet 1 provides a closed testing environment to prevent interference; gas injection module 2 accurately injects gas to meet calibration; fixture placement 3 facilitates the placement and removal of alarms, and multiple layers improve efficiency; main control panel 4 controls the module to display data; and layered exhaust fans 5 ensure uniform gas distribution in each layer.

[0030] A positioning plate 6 is attached to the side of the exhaust fan 5 away from the fixture 3. A device carrier 7 is fixedly connected inside the positioning plate 6, and honeycomb activated carbon 8, made of conductive material, is fixedly connected inside the device carrier 7. An electrode plate 9 is fixedly connected to the outside of the device carrier 7 and electrically connected to the main control panel 4. Two electrode plates 9 are symmetrically arranged about the vertical axis of the device carrier 7. Furthermore, the device carrier 7 facilitates the installation of activated carbon; the honeycomb activated carbon 8 adsorbs carbon monoxide to prevent pollution; and the symmetrical electrode plates 9, when energized, desorb gas from the activated carbon, achieving secondary treatment and convenient operation.

[0031] See Figure 7As shown, a filter screen 10, made of fiber material, is fixedly connected to one end of the device carrier 7 near the exhaust fan 5 to intercept particulate matter and large molecular weight impurities. The fiber filter screen 10 can prevent impurities from clogging the pores of activated carbon, extend the service life of activated carbon, reduce the frequency of consumable replacement, and ensure subsequent purification efficiency.

[0032] See Figure 4 - Figure 6 As shown, each of the four corners of the positioning plate 6 near the device carrier 7 has a column cavity 11. A snap-fit ​​groove 12 is fixedly connected within each column cavity 11. The snap-fit ​​groove 12 has an inner cavity, and a straight groove is formed in the center of its side near the positioning plate 6, communicating with the inner cavity. The column cavity 11 provides installation space for the snap-fit ​​groove 12; the snap-fit ​​groove 12, through its straight groove and cross-shaped snap-fit ​​body 15, facilitates quick disassembly of the carrier and simplifies maintenance.

[0033] At each of the four corners of the positioning plate 6, which is flush with the column cavity 11, a bonding plate 13 is fixedly connected. A column shell 14 is fixedly connected to the side of the bonding plate 13 away from the snap-fit ​​groove 12. A push column 16 is slidably connected inside the bonding plate 13. A cross snap-fit ​​body 15 is fixedly connected to one end of the push column 16 near the bonding plate 13. An auxiliary spring 17 is slidably sleeved on the outer ring of the push column 16. Both ends of the auxiliary spring 17 are fixedly connected to the push column 16 and the cross snap-fit ​​body 15, respectively. The bonding plate 13 ensures the stable sliding of the push column 16; the column shell 14 protects the internal push column 16 and auxiliary spring 17 from impurities, extending the component's lifespan.

[0034] A through groove is provided in the middle of the bonding plate 13. The push post 16 consists of a post body and a knob. The cross-shaped locking body 15 is locked into the inner cavity of the locking groove 12. The through groove provides a sliding channel for the push post 16; the push post 16 with a knob is easy to rotate; the cross-shaped locking body 15 is locked into the inner cavity to ensure a stable connection of the carrier and prevent it from falling off.

[0035] A high-precision carbon monoxide sensor, specifically an electrochemical sensor, is installed inside cabinet 1 to monitor the gas concentration inside cabinet 1 in real time and transmit the data to the main control panel 4.

[0036] The honeycomb activated carbon 8 has an embedded pressure sensor that detects the activated carbon adsorption saturation. When the preset value is reached, the sensor sends a signal to the main control panel 4 to replace the activated carbon.

[0037] Filter 10 is used to intercept particulate matter and large molecular weight impurities, reducing the load on honeycomb activated carbon 8.

[0038] The snap-fit ​​groove 12 and cross snap-fit ​​body 15 and other components are designed for quick disassembly and replacement of honeycomb activated carbon 8.

[0039] When the main control panel 4 determines that the purification efficiency has decreased by comparing the concentration values ​​of the inlet and outlet gases, the electrode plate 9 is energized through the cabinet 1, which causes Joule heating to be generated inside the honeycomb activated carbon 8, so that the adsorbed harmful gases are removed to the next module for secondary treatment.

[0040] Furthermore, the cabinet 1 is equipped with a frequency conversion mechanism, which includes a frequency converter 18 fixedly connected inside the cabinet 1. The motor used by the exhaust fan 5 is a frequency conversion motor, and the frequency conversion motor is electrically connected to the frequency converter 18.

[0041] The inverter 18 can control the speed of the variable frequency motor in the range of 500-3000 r / min by changing the output frequency; the speed sensor is electrically connected to the main control panel 4 to collect the speed data of the variable frequency motor in real time and transmit it to the main control panel 4. The main control panel 4 can compare the actual speed with the target speed, and finely adjust the output frequency of the inverter 18 when the deviation exceeds ±5%.

[0042] A carbon monoxide sensor is fixedly installed inside the cabinet 1 and is electrically connected to the main control panel 4. The carbon monoxide sensor is used to monitor the concentration of carbon monoxide gas inside the cabinet 1 in real time and to feed back the concentration monitoring data to the main control panel 4.

[0043] The inverter 18 can precisely control the speed of the variable frequency motor within the range of 500-3000 r / min by changing the output frequency, thereby achieving "stepless adjustment" of the air volume. For example, when the concentration sensor detects that the concentration in the cabinet 1 is lower than the set value by 5%, the main control panel 4 can instruct the inverter 18 to reduce the output frequency (e.g., from 50Hz to 30Hz), and the speed of the variable frequency motor will decrease synchronously (e.g., from 3000 r / min to 1800 r / min), reducing the air volume to reduce gas discharge and allowing the concentration to rise back to the set value. Conversely, when the concentration is too high, the frequency and speed will be increased to increase the air volume and balance the concentration.

[0044] The inverter 18 controls the variable frequency motor, which can precisely match different concentration calibration requirements through stepless speed adjustment, stabilize the carbon monoxide concentration in the cabinet, and ensure the calibration accuracy of the alarm. It dynamically adjusts the speed according to the cubic relationship between speed and power consumption, which greatly reduces power consumption and reduces the frequency of gas replenishment to save consumable costs. It has soft start and soft stop functions to reduce mechanical shock, and with overcurrent and overload protection, it extends the life of the motor and exhaust fan 5. It can independently control the speed of multi-layer exhaust fans 5, improve the concentration uniformity and calibration consistency of each layer, and can also be combined with closed-loop control to correct speed deviations, resist interference from voltage fluctuations and load changes, and improve the reliability of equipment operation.

[0045] The working principle of this device is as follows:

[0046] In use, the carbon monoxide alarm to be tested is installed on the placement fixture 3 inside the cabinet 1. The sealed door of the cabinet 1 is closed to prevent outside air from infiltrating and interfering with the testing environment. Then, the gas injection module 2 is activated to deliver carbon monoxide into the cabinet 1 to test the alarm. When the testing program ends, the main control panel 4 uses the internally installed carbon monoxide sensor to determine whether the carbon monoxide concentration in the cabinet is higher than the safety threshold. If it is higher than the threshold, the exhaust fan 5 is activated to discharge the carbon monoxide inside. During the discharge process, the carbon monoxide first enters the filter 10 module. Under the action of its fiber material, it physically intercepts and adsorbs particulate matter and large molecular weight impurities carried in the gas, such as dust falling off the surface of the alarm and volatile organic compounds, to prevent clogging of subsequent purification components.

[0047] The pretreated gas enters the honeycomb activated carbon 8. The honeycomb structure adsorbs carbon monoxide molecules through the pores, and the catalyst components on its surface can convert some of the adsorbed carbon monoxide into harmless carbon dioxide, thus improving the purification efficiency.

[0048] Furthermore, when the main control screen 4 detects a decrease in purification efficiency by comparing the concentration difference between the inlet and outlet air, the main control screen 4 controls the electrode plate 9 to be energized, and Joule heating is generated inside the honeycomb activated carbon 8, causing the adsorbed carbon monoxide to desorb and be transferred to the subsequent purification module, and the honeycomb activated carbon 8 to restore its adsorption capacity.

[0049] If the honeycomb activated carbon 8 becomes saturated during use and is regenerated to its maximum cycle, the operator will be prompted to replace it under the warning on the main control panel 4. During installation, the positioning plate 6 is attached to the surface of the exhaust fan 5. The cross-shaped snap-fit ​​body 15 is initially in an axially straight state. The operator pushes the push column 16 to slide it towards the snap-fit ​​groove 12 within the attachment plate 13. Under the push transmission, the cross-shaped snap-fit ​​body 15 is inserted into the slot on the surface of the snap-fit ​​groove 12. The auxiliary spring 17 is compressed to store elastic potential energy until the cross-shaped snap-fit ​​body 15 reaches the inner cavity of the snap-fit ​​groove 12. Under the feedback of the inner cavity surface of the snap-fit ​​groove 12, the cross snap-fit ​​body 15 on the surface slides to the bottom of the snap-fit ​​groove 12. At this time, the push column 16 is rotated 90 degrees. Under this rotation, the cross snap-fit ​​body 15 changes from parallel to the slot of the snap-fit ​​groove 12 to a perpendicular state. Under the contact of the inner wall of the snap-fit ​​groove 12, the movement of the cross snap-fit ​​body 15 is limited. Under the restoring force of the auxiliary spring body 17, the cross snap-fit ​​body 15 is in close contact with the inner cavity wall of the snap-fit ​​groove 12, avoiding the deflection of the cross snap-fit ​​body 15. This completes the quick disassembly process of the device carrier 7 without the need for additional power drive.

[0050] By setting up filter 10, dust and metal debris in the air, such as tiny particles, grease particles, and volatile organic molecules generated during the installation or testing of the alarm in cabinet 1, such as small amounts of plasticizers released from the material of cabinet 1, are pre-intercepted. This prevents such impurities from directly entering the activated carbon, occupying its pore space, reducing the effective adsorption sites for carbon monoxide, and causing premature saturation. Intercepting such impurities maintains the permeable structure of the activated carbon, enabling it to continuously and efficiently adsorb carbon monoxide, reducing the ineffective consumption of activated carbon, and extending its replacement or regeneration cycle.

[0051] The honeycomb activated carbon 8 has a regular honeycomb structure, which reduces gas flow resistance compared to traditional granular or columnar activated carbon. This allows carbon monoxide-containing gas discharged from cabinet 1 to flow quickly and evenly over the surface and internal micropores of the activated carbon, avoiding incomplete local purification caused by airflow congestion. Simultaneously, the honeycomb structure has a large specific surface area, providing ample adsorption sites to ensure efficient capture of carbon monoxide and meet the rapid response requirements of exhaust purification in cabinet 1. The conductive honeycomb activated carbon 8 itself acts as a conductive medium; when the electrode plate 9 is energized, the current directly flows through the interior of the honeycomb activated carbon 8, forming a circuit and generating Joule heating within it. This internal heating method results in low heat loss and high energy utilization, quickly raising the temperature of the honeycomb activated carbon 8 to the desorption threshold, thus enabling regeneration.

[0052] By combining components such as the snap-fit ​​groove 12 and the cross snap-fit ​​body 15, the replacement time of the honeycomb activated carbon 8 due to adsorption saturation or local impurity accumulation is shortened. This makes it easier for operators to quickly and regularly replace the honeycomb activated carbon 8, or to perform offline deep treatment on the regenerable honeycomb activated carbon 8, ensuring that the purification system is always in a highly efficient state.

[0053] The working process of inverter 18 is as follows:

[0054] After calibration begins, the main control panel 4 controls the solenoid valve to inject gas. The concentration sensor transmits the concentration signal inside the cabinet in real time. When the concentration reaches 80% of the set value, the main control panel 4 calculates the target speed and corresponding output frequency of the inverter 18 according to the "concentration-speed mapping table" and sends a command to the inverter 18. The inverter 18 soft-starts, converting AC power into the corresponding frequency voltage to drive the motor and exhaust fan 5 to rotate. The speed sensor provides real-time feedback of the speed. The main control panel 4 compares the actual speed with the target speed. If the deviation exceeds ±5%, the inverter 18 frequency is finely adjusted for correction. During calibration, when the concentration fluctuates, the main control panel 4 finely adjusts the inverter 18 frequency according to the concentration change to maintain stable speed and concentration. When calibration ends, the main control panel 4 commands the inverter 18 to reduce the frequency, and the motor soft-stops.

[0055] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A remote control frequency converter cabinet for a mining elevator, comprising a cabinet (1) and a gas injection module (2) for injecting carbon monoxide gas, characterized in that: The cabinet (1) is provided with multiple layers of placement fixtures (3) for placing carbon monoxide alarms to be tested. The placement fixtures (3) are provided with multiple layers and are pulled out and connected to the inner cavity of the cabinet (1). The top of the cabinet (1) is provided with a main control panel (4) electrically connected to the gas injection module (2). The side of the placement fixture (3) away from the cabinet door of the cabinet (1) is provided with an exhaust fan (5). The exhaust fan (5) is fixedly connected to the inner panel of the cabinet (1) and is set in accordance with the number of layers of the placement fixture (3).

2. The mine elevator underground remote control frequency converter cabinet according to claim 1, characterized in that: The exhaust fan (5) has a positioning plate (6) attached to the side away from the fixture (3). A device carrier (7) is fixedly connected inside the positioning plate (6). A honeycomb activated carbon (8) is fixedly connected inside the device carrier (7). The honeycomb activated carbon (8) is made of conductive material. An electrode plate (9) is fixedly connected to the outside of the device carrier (7). The electrode plate (9) is electrically connected to the main control panel (4). There are two electrode plates (9) symmetrically arranged around the vertical axis of the device carrier (7).

3. The mine elevator underground remote control frequency converter cabinet according to claim 2, characterized in that: The device carrier (7) is fixedly connected to a filter screen (10) that intercepts particulate matter and high molecular weight impurities at one end near the exhaust fan (5). The filter screen (10) is made of fiber material.

4. The mine elevator underground remote control frequency converter cabinet according to claim 2, characterized in that: The positioning plate (6) has four corners with column cavities (11) on the side near the device carrier (7). A snap-fit ​​groove (12) is fixedly connected in the column cavity (11). The snap-fit ​​groove (12) has an inner cavity and a straight groove is opened in the middle of the side near the positioning plate (6) to communicate with the inner cavity.

5. The mine elevator underground remote control frequency converter cabinet according to claim 4, characterized in that: The positioning plate (6) is fixedly connected to the four corners of the column cavity (11) at which it is parallel to the column cavity (11). The side of the adhesive plate (13) away from the snap-fit ​​groove (12) is fixedly connected to the column shell (14).

6. The mine elevator underground remote control frequency converter cabinet according to claim 5, characterized in that: A push post (16) is slidably connected inside the bonding plate (13). A cross-shaped snap-fit ​​body (15) is fixedly connected to one end of the push post (16) near the bonding plate (13). An auxiliary spring body (17) is slidably sleeved on the outer ring of the push post (16). Both ends of the auxiliary spring body (17) are fixedly connected to the push post (16) and the cross-shaped snap-fit ​​body (15) respectively.

7. The mine elevator underground remote control frequency converter cabinet according to claim 6, characterized in that: The bonding plate (13) has a through groove in the middle, the push column (16) is composed of a column body and a knob, and the cross-shaped snap-fit ​​body (15) is snapped into the inner cavity of the snap-fit ​​groove body (12).

8. The mine elevator underground remote control frequency converter cabinet according to claim 1, characterized in that: The cabinet (1) is equipped with a frequency conversion mechanism, which includes a frequency converter (18) fixedly connected inside the cabinet (1), a frequency conversion motor adapted to the exhaust fan (5), and a speed sensor; the exhaust fan (5) is driven by the frequency conversion motor, and the frequency conversion motor is electrically connected to the frequency converter (18).

9. The mine elevator underground remote control frequency converter cabinet according to claim 8, characterized in that: The inverter (18) can control the speed of the variable frequency motor in the range of 500-3000 r / min by changing the output frequency; the speed sensor is electrically connected to the main control panel (4) and is used to collect the speed data of the variable frequency motor in real time and transmit it to the main control panel (4). The main control panel (4) can compare the actual speed with the target speed, and finely adjust the output frequency of the inverter (18) when the deviation exceeds ±5%.

10. The mine elevator underground remote control frequency converter cabinet according to claim 9, characterized in that: A carbon monoxide sensor is fixedly installed inside the cabinet (1) and is electrically connected to the main control panel (4). The carbon monoxide sensor is used to monitor the concentration of carbon monoxide gas inside the cabinet (1) in real time and feed the concentration monitoring data back to the main control panel (4).

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