A fully automatic screen pipe device for mines and a screen pipe control method

Abstract

The application provides a full-automatic mine screen pipe lowering device and a method thereof, which comprises a booster, a shield, an elastic pressure measuring device and a hole protection pipe; the two sides of the shield are connected with the booster through circumferential bolts, the elastic pressure measuring device is fixedly connected with the booster through a base, and the hole protection pipe is connected with the booster through a connecting pipe. The hole protection pipe of the full-automatic mine screen pipe lowering device has an openable and closable state, and its length can be connected through plug-in connection according to actual hole spacing requirements; when the full-automatic mine screen pipe lowering device conveys the screen pipe upward, the hole protection pipe is connected with the booster through plug-in connection, the hole is protected, and the screen pipe in the hole is prevented from moving downward to hurt people; after the screen pipe is lowered, the single hole protection pipe can be disassembled, the screen pipe is left in the hole, and assembly and disassembly are simple. The booster of the full-automatic mine screen pipe lowering device can meet the lowering of screen pipes with different specifications.

Description

Technical Field

[0001] This invention belongs to the technical field of coal mine machinery and equipment, and particularly relates to a mechanized screen lowering device and a screen lowering control method for mining. Background Technology

[0002] Coal seam geological conditions are complex, and open-hole completion can easily lead to wellbore collapse, which in turn blocks gas flow channels. Using non-metallic screen pipes for completion in coal seams can effectively support the borehole walls in soft coal seams, solving the problem of wellbore collapse, without damaging the coal seam. Therefore, non-metallic screen pipe completion is being increasingly used in coalbed methane development.

[0003] With the continuous development of gas control equipment technology, tunnel drilling rigs are becoming increasingly mechanized, automated, and intelligent, which not only reduces the labor intensity of workers but also effectively protects their personal safety. The increasing automation of drilling rigs has significantly improved drilling efficiency. However, the development of other supporting processes after drilling has not kept pace, with the efficiency and safety issues of conveying the borehole screen becoming increasingly prominent.

[0004] In order to improve the gas extraction concentration in cross-layer boreholes, the Huainan mining area commonly adopts a process of sealing the borehole with 1-inch screens under the coal seam, 1.5-inch screens under the rock strata, and 2-inch screens at the borehole opening. For this screen-down process, existing methods rely on manual lowering, which is not only labor-intensive and inefficient, but also results in insufficient borehole depth, failing to meet the requirements for tiered screen lowering in deeper cross-layer boreholes. Furthermore, when transporting screens upwards into the borehole, there is a significant safety risk of screen slippage and injury, severely restricting the overall efficiency of gas extraction during drilling. In addition, while some mining areas have used mechanized screen-down devices, these are complex in structure, large in size, and unable to automatically transport multiple screen sizes simultaneously, nor do they consider rapid integration with drilling rigs.

[0005] For example, the existing technology, titled "Equipment and Conveying Method for Drilling Screen Pipes in Soft Coal Seams Underground in Coal Mines" (publication number CN105239971A), includes a frame body, a clamping mechanism, a conveying mechanism, and a driving mechanism. The frame body comprises a frame base and a screen pipe straightening plate located at one end of the frame base. The screen pipe straightening plate is detachably fixed to the clamping mechanism. The driving mechanism includes a first belt drive pair and a second belt drive pair arranged opposite to each other, supported on the frame base. The first and second belt drive pairs are provided with opposing belts to achieve accurate clamping and conveying of the screen pipes. The screen pipe straightening plate has holes for the screen pipes to pass through, as well as fixing plates and through holes located above and below the holes. The clamping mechanism includes at least a first tensioning ring and a second tensioning ring, with the upper ends of the first and second tensioning rings... The first belt drive is fixed in the through hole of the screen tube straightening plate by a first pin, and the lower end is adjusted by a lead screw passing through the fixed plate of the screen tube straightening plate. The lower ends of the first tension ring and the second tension ring are respectively set on both sides of the fixed plate. One end of the lead screw is connected to a cam through a second pin, and the other end of the lead screw is screw-engaged with an adjusting nut. The first belt drive includes a first upper fixed plate, a first driven pulley, a first lower fixed plate, a first driving pulley, and a first belt. The first belt is clamped between the first upper fixed plate and the first lower fixed plate and wraps around the first driving pulley and the first driven pulley. The second belt drive includes a second upper fixed plate, a fourth driven pulley, a second lower fixed plate, a second driving pulley, and a second belt. The second belt is clamped between the second upper fixed plate and the second lower fixed plate and wraps around the second driving pulley and the fourth driven pulley. The existing technical solution does not have an adaptive function and can only lower one size screen tube at a time. When lowering the screen tube, this device cannot prevent the screen tube from slipping downwards and injuring people. Summary of the Invention

[0006] The technical problem to be solved by this invention is how to improve the effect of the lower screen tube and increase the safety factor.

[0007] The present invention solves the above-mentioned technical problems through the following technical means:

[0008] The first aspect of the present invention provides a fully automatic screen lowering device for mining, including a booster, a protective cover, an elastic pressure measuring device, and a hole protection pipe; the two sides of the protective cover are connected to the booster by four bolts, the elastic pressure measuring device is fixedly connected to the booster by base bolts, and the hole protection pipe is connected to the booster by a connecting pipe.

[0009] Beneficial effects: The protective tube of the fully automatic screen pipe lowering device for mining applications has an openable and closable state. Its length can be connected by plugging according to the actual hole spacing requirements. When the fully automatic screen pipe lowering device for mining applications conveys the screen pipe upwards, the protective tube is plugged into the booster to protect the hole opening and prevent the screen pipe inside the hole from sliding down and injuring people. After the screen pipe is lowered, a single protective tube can be disassembled, leaving the screen pipe inside the hole. Assembly and disassembly are simple. The booster of the fully automatic screen pipe lowering device for mining applications can meet the needs of lowering screen pipes of different specifications.

[0010] Preferably, the booster includes a drive sprocket, an encoder, a first return spring assembly, a welded housing, a hydraulic motor, a drive wheel, a retaining ring, a drive shaft, a bearing end cover, a driven sprocket, a bearing, a driven wheel, a driven shaft, a connecting key, and a second return spring assembly;

[0011] The hydraulic motor is fixed to the welded housing by screws. The hydraulic motor shaft is driven to the drive sprocket via a key. The encoder is fixed to the hydraulic motor shaft by screws. Two rows of drive wheels and driven wheels are symmetrically installed on the lower side of the hydraulic motor. Bearings are embedded in both sides of the drive wheels. The drive wheels, retaining rings, and driven sprockets pass through the drive shaft and are installed on the welded housing in sequence. The bearing end caps with embedded bearings on both sides of the drive shaft are pressed onto both sides of the welded housing by screws. Bearings are embedded in both sides of the driven wheels. The driven wheels pass through the driven shaft and are installed on the slide groove of the welded housing. The driven wheels are limited by retaining springs on both sides. The first return spring assembly and the second return spring assembly are symmetrically installed on both sides of the welded housing by screws.

[0012] Beneficial Effects: The fully automatic screen pipe lowering device for mining applications utilizes chain drive, employing upper and lower sets of drive wheels and driven wheels to clamp and transport the intermediate screen pipe. Based on the device's structural characteristics, an automatic screen pipe conveying process was designed: During operation, a hydraulic motor drives the chain on the drive sprocket, which meshes with the two sets of driven sprockets, rotating the two sets of drive wheels. This, combined with the two sets of driven wheels, conveys the screen pipe. Simultaneously, the two sets of driven wheels compress springs under the push of cylinders on both sides, thereby changing the opening of the upper and lower sets of drive wheels and driven wheels, thus meeting the passage requirements of multi-level screen pipes.

[0013] Preferably, it also includes a tilting assembly, and the tilting assembly and the booster are connected by bolts on a welded mounting bracket. The fully automatic mining screen lowering device is connected to the fully hydraulic tunnel drilling rig through the tilting assembly.

[0014] Beneficial effects: The fully automatic screen pipe lowering device for mining applications can be quickly integrated with a fully hydraulic tunnel drilling rig. When lowering the screen pipe, the screen pipe is fed in through the rear end hole of the power head and quickly transported to the bottom of the hole through the device. The hydraulic power source of the device is drawn from the original hydraulic system of the tunnel drilling rig. After the screen pipe is completed, the booster is rotated away from the feed machine body by the flipping component, and drilling can proceed normally.

[0015] Preferably, the first reset spring assembly and the second reset spring assembly have the same structure. The first reset spring assembly includes a cylinder bracket, a cylinder, a spring cover, a first spring, a slider, a bracket, an adjusting bolt, and a retaining ring.

[0016] The upper end of the cylinder is connected to the cylinder bracket by screws. The piston rod at the lower end of the cylinder passes through the mounting holes on both sides of the driven wheel, the spring cover, the retaining ring, and the nut in sequence to fix it to the driven wheel. The threaded hole in the center of the slider is tightened with the adjusting bolt. Then the adjusting bolt is inserted into the through hole of the bracket. The bottom of the adjusting bolt is limited by the retaining ring. The first spring is stuck between the spring cover and the slider.

[0017] Beneficial effects: The screen tube specifications are determined based on the pressure sensor data. The hydraulic motor rotates at a constant speed and drives two sets of drive wheels and driven wheels to rotate and transport the screen tube. The encoder calculates the screen tube insertion depth based on the motor rotation data. The cylinder air pressure and the encoder data correspond one-to-one. Therefore, the controller controls the cylinder air pressure to control the clamping force on the screen tube, thus achieving the purpose of adaptive automatic adjustment of the clamping force of this fully automatic screen tube lowering device for mining.

[0018] Preferably, the flipping assembly includes a welding baffle, a welding mounting bracket, a hydraulic cylinder, screws, washers, nuts, a welding cylinder, and a limiting plate;

[0019] The fixed end of the hydraulic cylinder is connected to the welding baffle and the welding cylinder by screws, and the rotating end of the hydraulic cylinder is connected to the welding mounting bracket and the limiting plate by screws. The limiting plate is embedded in the circular through hole at one end of the welding baffle, and the welding cylinder is embedded in the circular through hole at the other end of the welding mounting bracket.

[0020] Preferably, the elastic pressure measuring device includes a roller, a support rod, a sleeve, a second spring, a pressure sensor, and a base; the roller is located in the groove of the support rod, the sleeve is open at one end and closed at the other end, and has U-shaped grooves on both sides of its surface for mounting the retractable protruding shafts on both sides of the support rod; the pressure sensor, the second spring, and the lower end of the support rod are located inside the sleeve; and the base is used to fix the sleeve and connect to the booster.

[0021] Preferably, the protective tube includes a semi-circular tube, a welding block, a bolt, a hinge, and a joint;

[0022] The two sides of the semicircular tube are welded together from the side by a row of hinges to enable it to open and close. At the other end of the side of the semicircular tube corresponding to the hinges, a row of perforated welding blocks is welded to facilitate the bolts to fasten the upper and lower semicircular tubes together.

[0023] Preferably, it also includes a controller, which is connected to an encoder and a pressure sensor, and the encoder is connected to a hydraulic motor.

[0024] A second aspect of the present invention provides a method for controlling the lower screen tube applied to the above-mentioned fully automatic lower screen tube device for mining, comprising the following steps:

[0025] A. The pressure value collected by the pressure sensor through the elastic pressure measuring device is transmitted to the controller in real time. The controller compares the value with the preset value in real time to confirm the specifications of the screen tube.

[0026] B. The controller sends a signal to the cylinder in the first reset spring assembly, and the corresponding cylinder extends to open the driven wheel a certain distance and wait for the first screen tube to pass through;

[0027] C. The controller simultaneously sends signals to the cylinders in the first and second reset spring assemblies. The cylinder in the first reset spring assembly retracts and clamps the first screen tube, while the cylinder in the second reset spring assembly extends, causing the driven wheel to open a certain distance to wait for the first screen tube to pass through.

[0028] D. The controller sends a signal to the hydraulic motor, and the hydraulic motor rotates at a constant speed, thereby driving the two sets of drive wheels and driven wheels to rotate and convey the screen tube.

[0029] E. The controller continues to send signals to the cylinder in the second reset spring assembly, and the corresponding cylinder retracts to clamp the screen tube, and the screen tube is continuously conveyed under the drive of the hydraulic motor.

[0030] F. The encoder records the rotation distance of the hydraulic motor in real time, i.e. the insertion depth of the screen tube, and feeds it back to the controller. The controller gradually increases the air pressure of the cylinder according to the insertion depth of the screen tube to ensure the clamping force of the screen tube.

[0031] Beneficial effect: In the control method of the lower screen tube in this application, the controller determines whether the screen tube is broken or blocked by an obstacle by observing the rotation of the hydraulic motor.

[0032] Preferably, the hydraulic motor is controlled to rotate via a motor rotation control valve; the cylinder is controlled to move via an electromagnetic proportional pressure reducing valve.

[0033] Preferably, the hydraulic motor is equipped with a motor rotation pressure detection device.

[0034] Beneficial effects: When the motor rotation pressure suddenly increases, it indicates that an obstacle or blockage has been encountered during the lowering of the screen pipe; when the motor rotation pressure suddenly decreases, it indicates that the screen pipe inside the well has broken.

[0035] The advantages of this invention are:

[0036] The protective tube of the fully automatic screen pipe lowering device for mining applications has an openable and closable state. Its length can be connected by plugging according to the actual hole spacing requirements. When the fully automatic screen pipe lowering device for mining applications conveys the screen pipe upwards, the protective tube is plugged into the booster to protect the hole opening and prevent the screen pipe inside the hole from sliding down and injuring people. After the screen pipe is lowered, a single protective tube can be disassembled, leaving the screen pipe inside the hole. Assembly and disassembly are simple. The booster of the fully automatic screen pipe lowering device for mining applications can meet the needs of lowering screen pipes of different specifications.

[0037] The fully automatic screen pipe lowering device for mining applications described in this application uses chain drive. It employs upper and lower sets of drive wheels and driven wheels to clamp and transport the intermediate screen pipe. Based on the structural characteristics of this device, an automatic screen pipe conveying process was designed: During operation, a hydraulic motor drives the chain on the drive sprocket, which meshes with the two sets of driven sprockets to rotate the two sets of drive wheels, thus transporting the screen pipe. Simultaneously, the two sets of driven wheels compress springs under the push of cylinders on both sides, thereby changing the opening of the upper and lower sets of drive wheels and driven wheels to meet the passage requirements of multi-stage screen pipes.

[0038] The fully automatic screen pipe lowering device for mining applications described in this application can be quickly integrated with a fully hydraulic tunnel drilling rig. When lowering the screen pipe, the screen pipe is fed in through the rear end hole of the power head and quickly transported to the bottom of the hole through the device. The hydraulic power source of the device is drawn from the original hydraulic system of the tunnel drilling rig. After the screen pipe is completed, the booster is rotated away from the feed machine body by the flipping component, and drilling can proceed normally.

[0039] The screen tube specifications are determined based on the pressure sensor data. The hydraulic motor rotates at a constant speed and drives two sets of drive wheels and driven wheels to rotate and transport the screen tube. The encoder calculates the screen tube insertion depth based on the motor rotation data. The cylinder air pressure and the encoder data correspond one-to-one. Therefore, the controller controls the cylinder air pressure to control the clamping force on the screen tube, thereby achieving the purpose of adaptive automatic adjustment of the clamping force of this fully automatic screen tube lowering device for mining.

[0040] In the control method for lowering the screen pipe in this application, the controller determines whether the screen pipe is broken or blocked by an obstacle by monitoring the rotation of the hydraulic motor. A sudden increase in the motor rotation pressure indicates that an obstacle was encountered during the lowering of the screen pipe; a sudden decrease in the motor rotation pressure indicates that the screen pipe inside the well is broken. Attached Figure Description

[0041] Figure 1 This is a diagram of the fully automatic screen lowering device for mining, as described in Example 1.

[0042] Figure 2 This is a front view of the booster in a fully automatic screen lowering device for mining.

[0043] Figure 3 This is a side sectional view of the booster in a fully automatic screen lowering device for mining.

[0044] Figure 4 This is a top view of the booster in a fully automatic screen lowering device for mining.

[0045] Figure 5 This is a diagram of the tilting component in a fully automatic screen lowering device for mining.

[0046] Figure 6 This is an exploded view of the tilting component in a fully automatic screen lowering device for mining.

[0047] Figure 7 This is Figure I of the reset spring assembly in a fully automatic screen lowering device for mining.

[0048] Figure 8 This is a diagram of the elastic pressure measuring device in a fully automatic screen lowering device for mining.

[0049] Figure 9 This is a diagram of the protective pipe in a fully automatic screen lowering device for mining.

[0050] Figure 10 This is a schematic diagram of the installation and rotation of the fully hydraulic tunnel drilling rig and the tilting component in a fully automatic screen pipe lowering device for mining.

[0051] Figure 11 This is a flowchart of the lower screen tube control method;

[0052] The markings in the diagram are as follows: 1—Tilting assembly; 2—Booster; 3—Guard; 4—Drive sprocket; 5—Encoder; 6—First return spring assembly; 7—Welded housing; 8—Hydraulic motor; 9—Drive wheel; 10—Retaining ring; 11—Drive shaft; 12—Bearing end cover; 13—Driven sprocket; 14—Bearing; 15—Driven wheel; 16—Driven shaft; 17—Connecting key; 18—Second return spring assembly; 19—Welded baffle; 20—Welded mounting bracket; 21—Hydraulic cylinder; 22—Screw; 23—Washer ; 24—Nut; 25—Welding cylinder; 26—Limiting plate; 27—Cylinder bracket; 28—Cylinder; 29—Spring cover; 30—First spring; 31—Slider; 32—Bracket; 33—Adjusting bolt; 34—Retaining ring; 35—Elastic pressure measuring device; 36—Roller; 37—Support rod; 38—Sleeve; 39—Second spring; 40—Pressure sensor; 41—Base; 42—Protective tube; 43—Semi-circular tube; 44—Welding block; 45—Bolt; 46—Hinge; 47—Connecting pipe; 48—Joint. Detailed Implementation

[0053] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, 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.

[0054] Example 1

[0055] according to Figure 1-10 As shown, this embodiment provides a fully automatic screen lowering device for mining, including a booster 2, a protective cover 3, an elastic pressure measuring device 35, a hole protection pipe 42, and a controller; the two sides of the protective cover 3 are connected to the booster 2 by bolts around the perimeter, the elastic pressure measuring device 35 is fixedly connected to the booster 2 by bolts on the base 41, and the hole protection pipe 42 is connected to the booster 2 by a connecting pipe 47.

[0056] The booster 2 includes a drive sprocket 4, an encoder 5, a first return spring assembly 6, a welded housing 7, a hydraulic motor 8, a drive wheel 9, a retaining ring 10, a drive shaft 11, a bearing end cover 12, a driven sprocket 13, a bearing 14, a driven wheel 15, a driven shaft 16, a connecting key 17, and a second return spring assembly 18.

[0057] The hydraulic motor 8 is fixed to the welded housing 7 by screws. The shaft end of the hydraulic motor 8 is driven by the drive sprocket 4 through the key of the hydraulic motor 8. The encoder 5 is fixed to the shaft end of the hydraulic motor 8 by screws. Two rows of drive wheels 9 and driven wheels 15 are symmetrically installed on the lower side of the hydraulic motor 8. Bearings 14 are embedded in both sides of the drive wheels 9. The drive wheels 9, retaining rings 10, and driven sprockets 13 pass through the drive shaft 11 and are installed on the welded housing 7. The bearing end caps 12 with bearings 14 embedded in both sides of the drive shaft 11 are pressed onto both sides of the welded housing 7 by screws. Bearings 14 are embedded in both sides of the driven wheels 15. The driven wheels 15 pass through the driven shaft 16 and are installed on the slide groove of the welded housing 7. The driven wheels 15 are limited by retaining springs on both sides. The first return spring assembly 6 and the second return spring assembly 18 are symmetrically installed on both sides of the welded housing 7 by screws.

[0058] The elastic pressure measuring device includes a roller 36, a support rod 37, a sleeve 38, a spring 39, a pressure sensor 40, and a base 41;

[0059] The roller 36 is located in the groove of the support rod 37. The sleeve 38 is open at one end and closed at the other end. U-shaped grooves are provided on both sides of the surface for mounting the retractable protruding shafts on both sides of the support rod 37. The pressure sensor 40, the spring 39 and the lower end of the support rod 37 are located inside the sleeve 38. The base 41 is used to fix the sleeve 38 and is connected to the booster 2.

[0060] The two sides of the semicircular tube 43 are welded together from the side by a row of hinges 46 to enable it to open and close. At the other end of the side of the semicircular tube 43 corresponding to the hinges 46, a row of perforated welding blocks 44 are welded to facilitate the bolts 45 to fasten the upper and lower semicircular tubes 43 together.

[0061] The controller is connected to encoder 5 and pressure sensor 40, and encoder 5 is connected to hydraulic motor 8.

[0062] Working Principle: The lower screen tube device uses a chain drive. The hydraulic motor 8 drives the chain on the drive sprocket 4, which meshes with the two sets of driven sprockets 13, thereby rotating the two sets of drive wheels 9 to provide power for the screen tube conveying. Simultaneously, the cylinders 28 in the first and second return spring assemblies 6 and 18 on both sides extend to compress the springs, causing the two sets of driven wheels 15 below to move away from the two sets of drive wheels 9 above, awaiting the passage of the screen tube. When the screen tube is between the upper and lower sets of drive wheels 9 and driven wheels 15, the cylinders 28 in the first and second return spring assemblies 6 and 18 retract, causing the two sets of driven wheels 15 below to move closer to the two sets of drive wheels 9 above, providing clamping force for the screen tube. Furthermore, due to the restoring force of the springs in the first and second return spring assemblies 6 and 18, even if the air supply is suddenly stopped, the restoring force of the springs will still cause the two sets of driven wheels 15 below to move closer to the two sets of drive wheels 9 above, clamping the screen tube and preventing it from sliding downwards and injuring people.

[0063] The protective tube 42 of the fully automatic screen lowering device for mining in this embodiment has an openable and closable state. Its length can be connected by plugging according to the actual hole spacing requirements. When the fully automatic screen lowering device for mining conveys the screen pipe upward, the protective tube 42 is plugged into the booster 2 to protect the hole opening and prevent the screen pipe inside the hole from falling down and injuring people. After the screen pipe is lowered, a single protective tube 42 can be disassembled to leave the screen pipe inside the hole. Assembly and disassembly are simple.

[0064] The fully automatic screen pipe lowering device for mining in this embodiment uses chain drive. It employs upper and lower sets of drive wheels 9 and driven wheels 15 to clamp and transport the intermediate screen pipe. Based on the structural characteristics of this device, an automatic screen pipe conveying process was designed: During operation, the hydraulic motor 8 drives the chain on the drive sprocket 4, which meshes with the two sets of driven sprockets 13, thus rotating the two sets of drive wheels 9. This, combined with the two sets of driven wheels 15, conveys the screen pipe. Simultaneously, the two sets of driven wheels 15 compress springs under the push of the cylinders 28 on both sides, thereby changing the opening of the upper and lower sets of drive wheels 9 and driven wheels 15, which can meet the passage requirements of multi-level screen pipes.

[0065] The screen tube specifications are determined based on the data from the pressure sensor 40. The hydraulic motor 8 rotates at a constant speed and drives the two sets of drive wheels 9 and driven wheels 15 to rotate and transport the screen tube. The encoder 5 calculates the screen tube insertion depth based on the motor rotation data. The air pressure of the cylinder 28 corresponds one-to-one with the data from the encoder 5. Therefore, the controller controls the air pressure of the cylinder 28 to control the clamping force on the screen tube, thereby achieving the purpose of adaptive automatic adjustment of the clamping force of the fully automatic screen tube lowering device for mining.

[0066] Example 2

[0067] This embodiment provides a fully automatic screen lowering device for mining. The difference between this embodiment and embodiment 1 is that it also includes a flipping component 1. The flipping component 1 and the booster 2 are connected by bolts on the welding mounting bracket 20. The fully automatic screen lowering device for mining is connected to the fully hydraulic tunnel drilling rig through the flipping component 1.

[0068] The flipping assembly 1 includes a welding baffle 19, a welding mounting bracket 20, a hydraulic cylinder 21, screws 22, washers 23, nuts 24, a welding cylinder 25, and a limiting plate 26. The fixed end of the hydraulic cylinder 21 is connected to the welding baffle 19 and the welding cylinder 25 by screws, and the rotating end of the hydraulic cylinder 21 is connected to the welding mounting bracket 20 and the limiting plate 26 by screws. The limiting plate 26 is embedded in a circular through hole at one end of the welding baffle 19, and the welding cylinder 25 is embedded in a circular through hole at the other end of the welding mounting bracket 20.

[0069] In this embodiment, the fully automatic screen pipe lowering device for mining is quickly integrated with the fully hydraulic tunnel drilling rig. When lowering the screen pipe, the screen pipe is fed in through the rear end hole of the power head and quickly transported to the bottom of the hole through the device. The hydraulic power source of the device is drawn from the original hydraulic system of the tunnel drilling rig. After the screen pipe is completed, the booster is rotated away from the feed machine body by the flipping component, and drilling can proceed normally.

[0070] Example 3

[0071] This embodiment provides a screen lowering tube control method applied to the above-mentioned fully automatic screen lowering tube device for mining, including the following steps:

[0072] A. The pressure value collected by the elastic pressure measuring device 35 and pressure sensor 40 is transmitted to the controller in real time. The controller compares the value with the preset value in real time to confirm the specifications of the screen tube.

[0073] B. The controller sends a signal to the cylinder 28 in the first reset spring assembly 6, and the corresponding cylinder 28 extends so that the driven wheel 15 opens a certain distance and waits for the first screen tube to pass through.

[0074] C. The controller simultaneously sends signals to the cylinders 28 in the first reset spring assembly 6 and the second reset spring assembly 18. The cylinder 28 in the first reset spring assembly 6 retracts to clamp the first screen tube, while the cylinder 28 in the second reset spring assembly 18 extends to allow the driven wheel 15 to open a certain distance to wait for the first screen tube to pass through.

[0075] D. The controller sends a signal to the hydraulic motor 8, and the hydraulic motor 8 rotates at a constant speed, thereby driving the two sets of drive wheels 9 and driven wheels 15 to rotate and convey the screen tube.

[0076] E. The controller continues to send a signal to the cylinder 28 in the second reset spring assembly 18, and the corresponding cylinder 28 retracts to clamp the screen tube, and the screen tube is continuously conveyed under the drive of the hydraulic motor 8.

[0077] F. Encoder 5 records the rotation distance of hydraulic motor 8 in real time, i.e. the insertion depth of screen tube, and feeds it back to controller. The controller gradually increases the air pressure of cylinder 28 according to the insertion depth of screen tube to ensure the clamping force of screen tube.

[0078] The hydraulic motor 8 is controlled to rotate via a motor rotation control valve; the cylinder 28 is controlled to move via an electromagnetic proportional pressure reducing valve. The hydraulic motor 8 is equipped with a motor rotation pressure detection system.

[0079] In this embodiment, the control method for lowering the screen pipe uses the rotational changes of the hydraulic motor 8 to determine whether the screen pipe is broken or blocked by an obstacle. A sudden increase in the motor's rotational pressure indicates that an obstacle has been encountered during the lowering of the screen pipe; a sudden decrease in the motor's rotational pressure indicates that the screen pipe inside the well has broken.

[0080] 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 the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fully automatic screen lowering device for mining, characterized in that, It includes a booster, a protective cover, an elastic pressure measuring device, and a protective tube; the two sides of the protective cover are connected to the booster by bolts around the perimeter, the elastic pressure measuring device is fixedly connected to the booster by base bolts, and the protective tube is connected to the booster by a connecting pipe. The booster includes a drive sprocket, an encoder, a first return spring assembly, a welded housing, a hydraulic motor, a drive wheel, a retaining ring, a drive shaft, a bearing end cover, a driven sprocket, a bearing, a driven wheel, a driven shaft, a connecting key, and a second return spring assembly. The hydraulic motor is fixed to the welded housing with screws. The shaft end of the hydraulic motor is driven by the drive sprocket via the key of the hydraulic motor. The encoder is fixed to the shaft end of the hydraulic motor with screws. Two rows of drive wheels and driven wheels are symmetrically installed on the lower side of the hydraulic motor. Bearings are embedded in both sides of the drive wheels. The drive wheels, retaining ring, and driven sprocket are sequentially installed on the welded housing through the drive shaft. The bearing end covers with embedded bearings on both sides of the drive shaft are pressed onto both sides of the welded housing with screws. Bearings are embedded in both sides of the driven wheels. The driven wheels are installed on the slide groove of the welded housing through the driven shaft. The driven wheels are limited by retaining springs on both sides. The first return spring assembly and the second return spring assembly are symmetrically installed on both sides of the welded housing with screws. The first reset spring assembly and the second reset spring assembly have the same structure. The first reset spring assembly includes a cylinder bracket, a cylinder, a spring cover, a first spring, a slider, a bracket, an adjusting bolt, and a retaining ring. The upper end of the cylinder is connected to the cylinder bracket by a screw. The piston rod at the lower end of the cylinder passes through the mounting holes on both sides of the driven wheel, the spring cover, the retaining ring, and the nut in sequence and is fixed to the driven wheel. The central threaded hole of the slider is tightened with the adjusting bolt. The adjusting bolt is then inserted into the through hole of the bracket. The bottom of the adjusting bolt is limited by the retaining ring. The first spring is stuck between the spring cover and the slider. The elastic pressure measuring device includes a roller, a support rod, a sleeve, a second spring, a pressure sensor, and a base. The roller is located in the groove of the support rod. The sleeve is open at one end and closed at the other end. U-shaped grooves are provided on both sides of the surface for clamping the retractable protruding shafts on both sides of the support rod. The pressure sensor, the second spring, and the lower end of the support rod are located inside the sleeve. The base is used to fix the sleeve and is connected to the booster. It also includes a controller, which is connected to an encoder and a pressure sensor, and the encoder is connected to a hydraulic motor.

2. The fully automatic screen lowering device for mining according to claim 1, characterized in that, It also includes a tilting assembly, which is connected to the booster by bolts on a welded mounting bracket. The fully automatic screen lowering device for mining is connected to the fully hydraulic tunnel drilling rig via the tilting assembly.

3. The fully automatic screen lowering device for mining according to claim 2, characterized in that, The flipping assembly includes a welding baffle, a welding mounting bracket, a hydraulic cylinder, screws, washers, nuts, a welding cylinder, and a limiting plate. The fixed end of the hydraulic cylinder is connected to the welding baffle and the welding cylinder by screws, and the rotating end of the hydraulic cylinder is connected to the welding mounting bracket and the limiting plate by screws. The limiting plate is embedded in a circular through hole at one end of the welding baffle, and the welding cylinder is embedded in a circular through hole at the other end of the welding mounting bracket.

4. The fully automatic screen lowering device for mining according to claim 1, characterized in that, The protective tube includes a semi-circular tube, welding blocks, bolts, hinges, and joints. The two sides of the semi-circular tube are welded together from the side by a row of hinges to enable it to open and close. At the other end of the side of the semi-circular tube corresponding to the hinges, a row of perforated welding blocks is welded to facilitate the bolts to fasten the upper and lower semi-circular tubes together.

5. A method for controlling a lower screen tube applied to the fully automatic lower screen tube device for mining as described in any one of claims 1-4, characterized in that, Includes the following steps: A. The pressure value collected by the pressure sensor through the elastic pressure measuring device is transmitted to the controller in real time. The controller compares the value with the preset value in real time to confirm the specifications of the screen tube. B. The controller sends a signal to the cylinder in the first reset spring assembly, and the corresponding cylinder extends to open the driven wheel a certain distance and wait for the first screen tube to pass through; C. The controller simultaneously sends signals to the cylinders in the first and second reset spring assemblies. The cylinder in the first reset spring assembly retracts to clamp the first screen tube, while the cylinder in the first reset spring assembly extends to open the driven wheel a certain distance to wait for the first screen tube to pass through. D. The controller sends a signal to the hydraulic motor, and the hydraulic motor rotates at a constant speed, thereby driving the two sets of drive wheels and driven wheels to rotate and convey the screen tube. E. The controller continues to send signals to the cylinder in the second reset spring assembly, and the corresponding cylinder retracts to clamp the screen tube, and the screen tube is continuously conveyed under the drive of the hydraulic motor. F. The encoder records the rotation distance of the hydraulic motor in real time, i.e. the insertion depth of the screen tube, and feeds it back to the controller. The controller gradually increases the air pressure of the cylinder according to the insertion depth of the screen tube to ensure the clamping force of the screen tube.

6. The control method according to claim 5, characterized in that, The hydraulic motor is controlled to rotate by a motor rotation control valve; the cylinder is controlled to move by an electromagnetic proportional pressure reducing valve.

7. The control method according to claim 5, characterized in that, The hydraulic motor is equipped with motor rotation pressure detection.

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