Automatic Protection System and Method for Maintaining Safe Ventilation Distance Between Air Supply Duct and Face in Tunneling

Abstract

This invention relates to an automatic system and method for ensuring safe ventilation distance between the ventilation duct and the face in a fully mechanized tunneling face. The system includes a telescopic ventilation duct, a positive pressure ventilation duct, a supply ventilation duct, hydraulic supports, a slide rail, and a self-propelled tracked platform. The slide rail is supported by hydraulic supports and is located on one side of the coal face. The supply ventilation duct and the telescopic ventilation duct are connected in series and suspended on the slide rail. The slide rail moves along the slide rail to adjust the position of the ventilation duct. A hydraulic cylinder is installed on the tracked platform and fixedly connected to a connecting rod. Driven by the tracked platform, the supply ventilation duct moves along the slide rail to ensure a safe ventilation distance. The system is equipped with lidar ranging, a hydraulic pump station, and a control system. It can automatically measure the distance between the ventilation duct and the face, the position of the tracked platform, and the height of the ventilation duct. Based on the data, it controls the tracked walking device, hydraulic supports, and cylinders to make precise adjustments, ensuring that the distance between the ventilation duct outlet and the face is always maintained within 5-10 meters. This invention improves ventilation, gas dilution, and dust removal efficiency by ≥80% through an automated adjustment mechanism, reduces labor intensity and labor costs, and enhances system stability and adaptability, resulting in significant safety benefits and economic value.

Description

Technical Field

[0001] This invention belongs to the field of coal mine ventilation and dust removal technology, and relates to an automatic system and method for ensuring the safe ventilation distance between the air supply duct and the face of a fully mechanized tunneling face. Background Technology

[0002] In the development and tunneling process of coal mine longwall faces, ventilation ducts are essential facilities for local ventilation, dilution of methane gas at the face, and dust removal. Maintaining the safe ventilation distance between the ventilation duct outlet and the face is crucial to the effectiveness of these ventilation and dust removal measures. Studies show that only when the distance between the ventilation duct outlet and the face is maintained within the standard range of 5-10 meters can the needs for local ventilation, methane dilution, and dust removal be met, achieving an efficiency of ≥80%. Compared to the approximately 60% of traditional methods, this represents an improvement of over 20%. Currently, the control of the distance L between the ventilation duct outlet and the face is typically achieved by 3-4 people periodically pulling the duct. This method suffers from high labor costs, high labor intensity, difficulty in guaranteeing the standard range L, and low efficiency in methane dilution and dust removal, generally resulting in an efficiency of ≤60%. Summary of the Invention

[0003] In view of this, the purpose of this invention is to solve the above problems and provide an automatic protection system and method for the safe ventilation distance between the ventilation duct and the face of a tunneling face. This system can monitor and automatically adjust the safe ventilation distance between the ventilation duct and the face in real time, ensuring that the efficiency of ventilation dilution of methane and ventilation dust removal reaches the expected standard, reducing labor costs and improving operational safety.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] An automatic safety protection system for the ventilation distance between the ventilation duct and the face of a tunneling face includes a telescopic ventilation duct, a positive pressure ventilation duct, a ventilation duct, a hydraulic support, a slide rail, and a self-moving tracked platform;

[0006] The slide rail is supported at both ends by hydraulic supports and is located on one side of the coal face. Multiple sliders are provided on the slide rail. The positive pressure ventilation duct, telescopic ventilation duct, and air supply duct are connected in series and suspended on the sliders. The sliders that suspend the telescopic ventilation duct are connected by connecting chains, and the sliders that suspend the air supply duct are fixedly connected by connecting rods.

[0007] The self-propelled tracked platform is located below the air supply duct. Hydraulic cylinders are fixed at both ends of the self-propelled tracked platform. The hydraulic cylinders are fixedly connected to the connecting rods. When the self-propelled tracked platform moves along the length of the slide rail, the hydraulic cylinders drive the air supply duct to move along the slide rail through the connecting rods, thereby adjusting the safe ventilation distance between the air supply duct and the frontal area.

[0008] Furthermore, the self-propelled tracked platform includes a tracked walking device, a control system, and a lidar. The hydraulic cylinders are fixedly mounted at both ends of the tracked walking device. The tracked walking device is equipped with multiple lidars, which are used to measure the safe ventilation distance between the air supply duct outlet and the face, the distance between the tracked walking device and the two sides of the roadway, and the height of the air supply duct. The control system controls the tracked walking device, hydraulic supports, and hydraulic cylinders to operate independently based on the lidar measurement data.

[0009] Furthermore, the tracked walking device is equipped with a hydraulic pump station and a cable retraction device. The hydraulic support, hydraulic cylinder, and tracked walking device are all powered by the hydraulic pump station. The cable retraction device is used to retract and extend the connecting cable during movement.

[0010] Furthermore, the hydraulic cylinder has a built-in displacement transmitter for real-time monitoring of the cylinder's extension and retraction distance, and the control device performs independent or coordinated control on each hydraulic cylinder.

[0011] Furthermore, the top of the hydraulic cylinder is equipped with a hydraulic locking device, which locks the hydraulic cylinder to the slide rail.

[0012] Furthermore, a ventilation duct storage device is provided below the slide rail; the telescopic ventilation duct is located in the ventilation duct storage device and its length can be extended or retracted under the drive of the self-propelled tracked platform.

[0013] An automatic method for ensuring safe ventilation distance between the ventilation duct and the face of a tunneling face is provided. The method employs the aforementioned automatic system for ensuring safe ventilation distance between the ventilation duct and the face of a tunneling face. The system utilizes lidar to monitor the distance between the ventilation duct and the face in real time. The control system adjusts the tracked walking device based on the data, driving the hydraulic cylinder to move the ventilation duct synchronously, ensuring that the distance between the ventilation duct and the face is maintained within 5 to 10 meters.

[0014] Furthermore, when it is necessary to adjust the distance between the tracked walking device and the two sides of the roadway, the control system controls the lower end of the hydraulic support to retract, and the air supply duct and the slide rail are supported on the self-moving tracked platform by the hydraulic cylinder. The laser radar detects the distance between the tracked device and the two sides of the roadway, and the control system automatically adjusts the position of the tracked walking device according to the measurement results, and then controls the hydraulic support to extend, and supports the fixed slide rail through the hydraulic support.

[0015] Furthermore, when it is necessary to adjust the height of the air supply duct, the control system adjusts the hydraulic support to achieve height adjustment based on the height data of the air supply duct measured by the lidar.

[0016] The beneficial effects of this invention are as follows:

[0017] 1) This invention utilizes a lidar ranging and control system. The system can monitor and adjust the ventilation distance between the ventilation duct and the face, the height of the ventilation duct, and the distance between the tracked device and the two sides of the roadway in real time. After the data is fed back to the control system, the tracked device and hydraulic cylinders can quickly complete the adjustment to ensure that the safe ventilation distance remains stable within a reasonable range.

[0018] 2) Automated systems effectively reduce the risk of human error, reduce manpower input and frequent equipment wear and tear, thereby reducing the operating costs of coal mining enterprises and improving overall economic efficiency.

[0019] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, wherein:

[0021] Figure 1 This is a schematic diagram of the automatic safety ventilation distance protection system between the ventilation duct and the face in the tunneling face in this invention.

[0022] Reference numerals: 1-Air supply duct; 2-Slide rail; 3-Slider; 4-Connecting rod; 5-Telescopic air duct; 6-Positive pressure air duct; 7-Hydraulic support; 8-Hydraulic support; 9-Connecting chain; 10-Hydraulic cylinder; 11-Hydraulic cylinder; 12-Hydraulic locking device; 13-Hydraulic pump station; 14-Cable winding and unwinding device; 15-Control system; 16-LiDAR; 17-LiDAR; 18-LiDAR; 19-Crawler walking device. Detailed Implementation

[0023] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can be modified or changed 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 are only schematic representations of the basic concept of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0024] The accompanying drawings are for illustrative purposes only and are schematic diagrams, not actual pictures. They should not be construed as limiting the invention. To better illustrate the embodiments of the invention, some parts in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0025] In the accompanying drawings of the embodiments of the present invention, the same or similar reference numerals correspond to the same or similar components. In the description of the present invention, it should be understood that if terms such as "upper," "lower," "left," "right," "front," and "rear" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting the present invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0026] Please see Figure 1 This is an automatic protection system for the safe ventilation distance between the ventilation duct and the face of a tunneling face, including a telescopic ventilation duct 5, a positive pressure ventilation duct 6, a ventilation duct 1, a hydraulic support 7, a hydraulic support 8, a slide rail 2, and a self-moving tracked platform;

[0027] The slide rail 2 is supported at both ends by hydraulic supports 7 and 8 and is set on one side of the coal face. Multiple sliders 3 are set on the slide rail 2. The positive pressure air duct 6, the telescopic air duct 5, and the air supply duct 1 are connected in series and suspended on the sliders 3. The sliders 3 that suspend the telescopic air duct 5 are connected by connecting chains 9, and the sliders 3 that suspend the air supply duct 1 are fixedly connected by connecting rods 4.

[0028] The self-propelled tracked platform is located below the air supply duct 1. Hydraulic cylinders 10 and 11 are fixedly installed at both ends of the self-propelled tracked platform. The hydraulic cylinders 10 and 11 are fixedly connected to the connecting rod 4. When the self-propelled tracked platform moves along the length of the slide rail 2, the hydraulic cylinders 10 and 11 drive the air supply duct 1 to move along the slide rail 2 through the connecting rod 4, thereby adjusting the safe ventilation distance between the air supply duct 1 and the frontal area.

[0029] The self-propelled tracked platform includes a tracked walking device 19, a control system 15, and a lidar. Hydraulic cylinders are fixedly installed at both ends of the tracked walking device 19. Lidar 16, lidar 17, and lidar 18 are installed on the tracked walking device 19. The lidars can rotate 360°. Lidar 16, lidar 17, and lidar 18 are used to measure the safe ventilation distance L from the air outlet of the air supply duct 1 to the face, the distance of the tracked walking device 19 from the two sides of the roadway, and the height of the air supply duct 1, respectively. The control system 15 is programmed with PLC and controls the tracked walking device 19, hydraulic supports, and hydraulic cylinders to move according to the lidar measurement data.

[0030] The tracked traveling device 19 is equipped with a hydraulic pump station 13 and a cable retraction device 14. The hydraulic support, hydraulic cylinder, and tracked traveling device 19 are all powered by the hydraulic pump station 13. The cable retraction device 14 is used to retract the connecting cable during movement. The tracked traveling device 19 is hydraulically driven, 2m long and 1.5m wide. The tracked traveling device 19 moves the connecting rod 4 connected to it forward or backward, which in turn moves the telescopic ventilation duct 5 and the air supply duct 1 suspended below forward or backward, thus ensuring a safe ventilation distance between the air outlet of the air supply duct 1 and the front. Its automatic adjustment range is 0-10m.

[0031] The hydraulic cylinders are equipped with built-in displacement sensors to monitor the cylinder extension and retraction distance in real time. The control device can independently or in conjunction with other devices control each hydraulic cylinder. The hydraulic cylinders are 1.5m long and have an adjustable extension and retraction range of 0 to 1.2m, which can be used to adjust the levelness of the telescopic ventilation duct 5 and the air supply duct 1.

[0032] The top of the hydraulic cylinder is equipped with a hydraulic locking device 12, which locks the hydraulic cylinder to the slide rail 2. When the air supply duct 1 needs to be moved, the hydraulic locking device 12 is opened.

[0033] A ventilation duct storage device is installed below the slide rail 2; the telescopic ventilation duct 5 is installed in the ventilation duct storage device and its length can be extended or retracted by the self-propelled tracked platform. The ventilation duct storage section can store telescopic ventilation ducts 5 with a length of 15m and a diameter of φ600mm~φ1000mm. The telescopic ventilation duct 5 is connected to multiple sliders 3 by connecting chains 9, and each slider 3 is connected to the others by connecting chains 9 (with a telescopic length of 1m).

[0034] The hydraulic prop has a designed length of 1.3m and a telescopic length of 0.5m, with its upper end fixed to the slide rail 2. Under normal operating conditions, the prop is fully extended under control, supporting the slide rail 2. The self-propelled tracked platform moves forward or backward along the slide rail 2 under the control of the control system 15. During overall movement, the prop is fully retracted under the control of the control system 15, with the hydraulic cylinder supporting the slide rail 2. Under the control of the control system 15, the hydraulic locking device 12 locks to prevent the slider 3 from sliding. The self-propelled tracked platform uses the hydraulic cylinder to support the slide rail 2, thus allowing the entire device to move forward or backward along the tunnel direction.

[0035] An automatic method for ensuring the safe ventilation distance between the ventilation duct 1 and the face of a tunneling face is provided. The method employs the aforementioned automatic system for ensuring the safe ventilation distance between the ventilation duct 1 and the face of a tunneling face. The system utilizes lidar 16, lidar 17, and lidar 18 to monitor the distance L between the ventilation duct 1 and the face of the face in real time. The control system 15 adjusts the tracked walking device 19 according to the data, driving the hydraulic cylinder to move the ventilation duct 1 synchronously, ensuring that the distance L between the ventilation duct 1 and the face of the face is maintained within the range of 5 to 10 meters.

[0036] When it is necessary to adjust the distance between the tracked walking device 19 and the two sides of the roadway, the control system 15 controls the lower ends of the hydraulic props 7 and 8 to retract. The ventilation duct 1 and the slide rail 2 are supported on the self-moving tracked platform by the hydraulic cylinders 10 and 11. The laser radar detects the distance between the tracked device and the two sides of the roadway. The control system 15 automatically adjusts the position of the tracked walking device 19 according to the measurement results, and then controls the hydraulic props 7 and 8 to extend, supporting and fixing the slide rail 2 through the hydraulic props.

[0037] When the height of the air supply duct 1 needs to be adjusted, the control system 15 adjusts the hydraulic support to achieve the height adjustment based on the height data of the air supply duct 1 measured by the lidar.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A kind of face supply air cylinder distance automatic guarantee system of safety ventilation, it is characterized by: It comprises telescopic air duct, positive pressure air duct, air supply duct, hydraulic prop, slide rail, self-moving caterpillar platform; The slide rail is supported by the hydraulic props at both ends and arranged on one side of the coal wall, and a plurality of sliding blocks are arranged on the slide rail; the positive pressure air duct, the telescopic air duct and the air supply duct are sequentially connected and hoisted on the sliding blocks; the sliding blocks hoisting the telescopic air duct are connected by connecting chains, and the sliding blocks hoisting the air supply duct are fixedly connected by connecting rods; The self-moving caterpillar platform is arranged below the air supply duct, and hydraulic oil cylinders are fixedly arranged at both ends of the self-moving caterpillar platform; the hydraulic oil cylinders are fixedly connected with the connecting rods, and when the self-moving caterpillar platform moves along the length direction of the slide rail, the hydraulic oil cylinders drive the air supply duct to move along the slide rail through the connecting rods, so as to adjust the distance between the air supply duct and the heading safety ventilation distance. The self-moving caterpillar platform comprises a caterpillar walking device, a control system and a laser radar, and the hydraulic oil cylinders are fixedly arranged at both ends of the caterpillar walking device; a plurality of laser radars are arranged on the caterpillar walking device and used for measuring the distance between the air outlet of the air supply duct and the heading safety ventilation distance, the distance between the caterpillar walking device and the two sides of the roadway, and the height of the air supply duct; the control system controls the caterpillar walking device, the hydraulic props and the hydraulic oil cylinders according to the measurement data of the laser radars; The top end of the hydraulic oil cylinder is provided with a hydraulic locking device for locking the hydraulic oil cylinder and the slide rail; The laser radar is used for real-time monitoring of the distance between the air supply duct and the heading, and the control system adjusts the caterpillar walking device according to the data to drive the hydraulic oil cylinders to synchronously move the air supply duct, so as to ensure that the distance between the air supply duct and the heading is kept within the range of 5-10 meters.

2. The automatic protection system for the distance of the safe ventilation of the face supplied with air against the heading according to claim 1, characterized in that: The caterpillar walking device is provided with a hydraulic pump station and a cable winding and unwinding device, and the hydraulic props, the hydraulic oil cylinders and the caterpillar walking device are all powered by the hydraulic pump station; the cable winding and unwinding device is used for winding and unwinding the connecting cable during movement.

3. The automatic protection system for the distance of the safe ventilation of the face supplied with air against the heading according to claim 1, characterized in that: The hydraulic oil cylinder is provided with a displacement transmitter for real-time monitoring of the extension distance of the oil cylinder, and the control system controls each hydraulic oil cylinder independently or in linkage.

4. The automatic protection system for the distance of the safe ventilation of the face supplied with air against the heading according to claim 1, characterized in that: A wind duct storage device is arranged below the slide rail; the telescopic air duct is arranged in the wind duct storage device and realizes length extension under the driving of the self-moving caterpillar platform.

5. The automatic protection system for the distance of the safe ventilation of the face supplied with air against the heading according to claim 1, characterized in that: When it is necessary to adjust the distance between the caterpillar walking device and the two sides of the roadway, the control system controls the lower end of the hydraulic prop to be retracted, the air supply duct and the slide rail are supported on the self-moving caterpillar platform by the hydraulic oil cylinders, the laser radars detect the distance between the caterpillar device and the two sides of the roadway, the control system automatically adjusts the position of the caterpillar walking device according to the measurement results, and then controls the hydraulic props to be extended to support and fix the slide rail.

6. The automatic protection system for the distance of the safe ventilation of the face supplied with air against the heading according to claim 1, characterized in that: When it is necessary to adjust the height of the air supply duct, the control system adjusts the hydraulic props according to the height data of the air supply duct measured by the laser radars to realize height adjustment.

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