A dual-drum adaptive coal mining machine cutter head

Abstract

This invention discloses a dual-drum adaptive coal mining machine cutting head, including a main cutting drum, a secondary cutting drum, a transmission box, a tracked cutting section, an automatic telescopic mechanism, and a first-section drill rod box, etc., which is used in conjunction with the drive unit of a long-distance spiral drill rod coal mining machine. The spiral drill rod drives the main cutting drum to rotate and cut through a bevel gear transmission system. The main cutting drum drives the secondary cutting drum to rotate and cut through a chain transmission system. The secondary cutting drum adjusts its mining height through a rear automatic telescopic mechanism. The automatic telescopic mechanism is equipped with a pneumatic spring system, which can automatically adjust the height of the secondary drum according to the undulation of the coal seam, realizing the adaptive adjustment of the coal mining machine's mining height. This invention's cutting head can effectively handle complex coal seams with thicknesses between 0.5 meters and 1.3 meters and with undulating surfaces, effectively solving the problem of coal residue at the edges and corners of traditional drill-type coal mining machines, improving coal mining efficiency and resource recovery rate, and reducing damage to the coal roadway floor caused by the coal mining machine by using a drill rod box.

Description

Technical Field

[0001] This invention relates to the field of coal mining machinery and equipment, and in particular to a double-drum adaptive coal mining machine cutting head. Background Technology

[0002] Coal, as one of the most important energy sources for humankind, has made a tremendous contribution to the progress of global material civilization and provided a strong guarantee for the improvement of social productivity. In recent years, my country's total coal mining volume has continued to rise, indicating a growing domestic demand for coal. It is expected that coal will remain my country's main energy source for the next few decades.

[0003] With coal resources dwindling, coal mining technology for complex coal seams will see even greater development potential and prospects. Existing thin-seam coal mining machines, such as continuous miners and drill miners, each have their own advantages and disadvantages under different coal seam conditions. Continuous miners are suitable for thicker coal seams, but because their tracks must withstand cutting forces and the machine's own weight during operation, frequent movement can damage the coal roadway floor, making them unsuitable for mining extremely thin coal seams. While drill miners are suitable for mining extremely thin coal seams, their mining height is limited by the drill bit diameter, making it impossible to adjust the mining height according to needs. Furthermore, coal pillars and corner coal are often left between boreholes, resulting in low resource recovery rates.

[0004] Therefore, existing technologies have failed to effectively solve the problems of height adjustment and resource recovery in complex coal seam mining, and there is an urgent need for a new type of coal mining machine cutting head to adapt to coal seams of different thicknesses and undulations. Summary of the Invention

[0005] The problem to be solved by this invention is to provide a double-drum adaptive coal mining machine cutting head, which adapts to coal seam conditions of different thicknesses through the double-drum structure, improves the adaptability of the equipment, and effectively solves the problems caused by coal seam undulations during complex coal seam mining.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a dual-drum adaptive coal mining machine cutting equipment, comprising: a main cutting drum, a secondary cutting drum, a transmission box, a tracked cutting section, an automatic telescopic mechanism, and a first section drill rod box, etc.

[0007] The first section of the drill rod box is equipped with a spiral drill rod. The torque from the coal mining machine drive unit is transmitted to the transmission box through the spiral drill rod, and then to the main cutting shaft in the main cutting drum through the bevel gear transmission system in the transmission box. The main cutting shaft drives the main cutting drum to rotate and cut the coal seam.

[0008] The main cutting drum is equipped with a sprocket in the middle. The torque of the main cutting drum is transmitted to the auxiliary cutting drum through the sprocket drive, which drives the auxiliary cutting drum to rotate and cut the coal seam.

[0009] The secondary cutting drum adjusts the coal mining height through an automatic telescopic mechanism located at the rear. The automatic telescopic mechanism is equipped with a pneumatic spring, which automatically adjusts the height of the secondary cutting drum according to the undulation of the coal seam, so as to realize the adaptive adjustment of the coal mining height by the coal mining machine.

[0010] The main cutting drum and the auxiliary cutting drum are equipped with cutting teeth, and the main cutting drum and the auxiliary cutting drum are responsible for cutting the coal seam.

[0011] The main cutting drum includes a main cutting shaft, a main cutting intermediate drum, and main cutting side drums; the auxiliary cutting drum includes an auxiliary cutting shaft, an auxiliary cutting intermediate drum, and auxiliary cutting side drums; the transmission box includes a transmission box body, a bevel gear input shaft, and a bevel gear train; the tracked cutting section includes a drive sprocket, a driven sprocket, a track beam, tracks, and a tensioning device; the automatic telescopic mechanism includes a first connecting rod, a second connecting rod, a pin shaft, a pneumatic telescopic device, and a spring damping device; the first drill pipe box includes a drill pipe box body, a support flange, a spiral drill pipe, and an automatic telescopic mechanism mounting beam.

[0012] Preferably, the main cutting roller is divided into a main cutting intermediate roller and main cutting side rollers. The two ends of the main cutting intermediate roller are clamped by the round ends of the transmission box body. The main cutting intermediate roller is provided with an internal spline and connected to the main cutting shaft. One side of the main cutting side rollers is connected to the main cutting intermediate roller, and an oil seal is provided at the connection. The other side of the main cutting side rollers is connected to the main cutting shaft.

[0013] Preferably, the main intermediate cutting drum and the main two side cutting drums are each equipped with blades, and their rotation directions are opposite. The main cutting drum is not only responsible for cutting the coal seam, but also for conveying coal blocks. The main cutting drum can convey the broken coal blocks to the vicinity of the drill pipe box through the spiral blades. Since the main intermediate cutting drum and the main two side cutting blades rotate in opposite directions, the conveyed coal blocks are more concentrated, which makes it easier for the subsequent spiral drill pipe to be transported.

[0014] Preferably, the secondary cutting shaft is connected to the driven sprocket via a spline, and the secondary cutting intermediate roller and the secondary cutting side rollers are mounted on the secondary cutting shaft; the secondary cutting side rollers have a slot in the middle position to connect with the automatic telescopic mechanism.

[0015] Preferably, one end of the transmission box is bolted to the drill rod box, the bevel gear input shaft is connected to the spiral drill rod via an internal spline, and the bevel gear train is connected to the bevel gear input shaft at one end via an external spline and to the main cutting shaft inside the main cutting drum at the other end. The transmission box is not only responsible for transmitting torque, but also for supporting the rotation and cutting of the main cutting drum.

[0016] Preferably, the drive sprocket is installed in the middle of the main cutting intermediate drum, and the track cutting section is equipped with a track beam. One end of the track beam is installed on both sides of the drive sprocket, and the other end is installed on both sides of the driven sprocket. The driven sprocket is installed in the middle of the auxiliary cutting intermediate drum, and transmits the torque of the main cutting drum to the auxiliary cutting drum through chain drive. A tensioning device is provided on the inner side of the track beam. Chains are arranged on the drive sprocket and the driven sprocket, and a track is provided on the outside of the chain. Cutting teeth are provided on the track. While the main and auxiliary cutting drums are rotating, the track cutting section is responsible for cutting the coal in the middle section.

[0017] Preferably, one end of the first connecting rod is installed at the circular groove position of the rollers on both sides of the secondary cutting roller and connected to the secondary cutting roller, and the other end is connected to the second connecting rod; the second connecting rod is connected to the pneumatic telescopic device through a pin; the other end of the pneumatic telescopic device is connected to a spring damping device, and the spring damping device is welded to the mounting beam of the automatic telescopic mechanism.

[0018] The pneumatic telescopic device and the spring damping device constitute a pneumatic spring system, which adaptively adjusts its length according to pressure; the pneumatic telescopic device can extend or shorten, and the spring damping device can absorb vibration and perform vibration reduction.

[0019] Preferably, a pressure sensor is also arranged on the automatic telescopic mechanism, and a pressure allowable range is provided, which can detect changes in the propulsion resistance of the secondary cutting drum.

[0020] Preferably, the auger drill rod is supported by a drill rod box. The auger drill rod is connected to the drill rod box body through a support flange. A bearing is provided between the auger drill rod and the support flange. The support flange and the drill rod box body are connected by bolts or welding. The thrust or pull force of the cutting head in the front and rear directions is borne by the drill rod box body. The drill rod box can effectively absorb the cutting resistance and gravity of the main and auxiliary cutting rollers, and can adapt to more complex base plate conditions. The auger drill rod only needs to transmit torque, which improves the transmission efficiency.

[0021] Furthermore, the power from the auger drill rod is transmitted to the bevel gear input shaft via a spline, and then to the main cutting shaft via the bevel gear transmission system in the transmission box; the main cutting shaft drives the main cutting drum to rotate and cut the coal seam.

[0022] The main cutting intermediate roller drives the drive sprocket to rotate, and the rotation of the drive sprocket drives the crawler cutting section to rotate and cut the coal seam.

[0023] The driven sprocket of the tracked cutting unit drives the secondary cutting shaft to rotate, and the secondary cutting shaft drives the secondary cutting drum to rotate and cut the coal seam.

[0024] Furthermore, the transmission box, main cutting roller, track beam, auxiliary cutting roller, and automatic telescopic mechanism constitute a composite crank-slider mechanism.

[0025] Furthermore, the main cutting drum and the auxiliary cutting drum can be disassembled. When the thickness of the coal seam being mined is less than 0.8m, the auxiliary cutting drum can be disassembled, and only the main cutting drum can be used for cutting.

[0026] Furthermore, when the secondary cutting drum encounters changes in the coal seam or increases in cutting resistance, the propulsion resistance increases, the pneumatic spring system is compressed, the automatic telescopic mechanism is shortened, and the height of the secondary cutting drum is reduced to adapt to changes in the coal seam.

[0027] As the mineable area of ​​the coal seam increases, the pneumatic spring system slowly lengthens, and the secondary cutting drum gradually rises to the predetermined position. The specific steps are as follows:

[0028] S1. The pressure sensor obtains the cutting resistance of the secondary cutting drum and has a pressure allowable range.

[0029] S2. When the secondary cutting drum encounters large undulations in the coal seam and increases cutting resistance during the cutting process, the sensor detects the change and inputs a signal.

[0030] S3. The automatic telescopic mechanism will shorten, thereby reducing the coal mining height to adapt to changes in the coal seam;

[0031] S4. When the propulsion resistance of the secondary cutting drum is lower than the set allowable range, the automatic telescopic mechanism will slowly extend until it returns to the pressure allowable range, ensuring the stability and efficiency of the cutting operation.

[0032] The beneficial effects of the present invention, compared with the prior art, are as follows:

[0033] 1. The present invention relates to a double-drum adaptive coal mining machine cutting head, which adopts a double-drum form. The transmission box, main cutting drum, crawler beam, auxiliary cutting drum and automatic telescopic mechanism constitute a composite crank-slider mechanism. The auxiliary drum is supported by a pneumatic spring and adopts an elastic variable mining height process, which solves the problem of adapting to the undulation of coal seams during complex coal seam mining.

[0034] 2. The cutting head of the dual-drum adaptive coal mining machine of the present invention adopts the method of rear-mounted power head, which solves the problem of the traditional drilling coal mining machine with front-mounted power head, which causes the cutting head to be too heavy and damage the bottom plate.

[0035] 3. Traditional long-distance drilling coal mining machines require a hydraulic motor at the cutting head position, necessitating the continuous advancement of hydraulic lines as the cutting head moves forward, making operation very cumbersome. The present invention, a double-drum adaptive coal mining machine, uses a combination of bevel gear transmission system and chain transmission system for the cutting head, replacing the front-mounted hydraulic motor and eliminating the need for advancing hydraulic lines, thus simplifying operation.

[0036] 4. The cutting head of the double-drum adaptive coal mining machine of this invention adopts horizontal axis milling, which solves the problem of coal leaving at the corners of traditional drill coal mining machines. It also adopts the drill rod box method to reduce the damage of the coal mining machine to the coal roadway floor, and has strong adaptability and safety.

[0037] 5. The dual-drum adaptive coal mining machine cutting head of the present invention adopts two cutting drums, a main one and a secondary one, which has a larger cutting cross-section and higher efficiency. The secondary cutting drum can be disassembled, and a thinner coal seam can be mined through the main cutting drum. Attached Figure Description

[0038] Figure 1 This is a diagram showing the installation position of the cutting head of the dual-drum adaptive coal mining machine of the present invention;

[0039] Figure 2 This is a structural diagram of the main body of the cutting head of the dual-drum adaptive coal mining machine of the present invention;

[0040] Figure 3 This is an assembly drawing of the cutting head parts for the dual-drum adaptive coal mining machine of the present invention;

[0041] Figure 4 This is a sectional view of the transmission box of the cutting head of the dual-drum adaptive coal mining machine of the present invention;

[0042] Figure 5 This is a schematic diagram of the variable mining height of the cutting head of the dual-drum adaptive coal mining machine of the present invention;

[0043] Figure 6 This is a flowchart illustrating the variable mining height control process of the cutting head of the dual-drum adaptive coal mining machine of the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Main cutting drum, 2. Secondary cutting drum, 3. Transmission box, 4. Tracked cutting section, 5. Automatic telescopic mechanism, 6. First section of drill pipe box; 1-1 Main cutting shaft, 1-2 Main cutting intermediate drum, 1-3 Main cutting side drums; 2-1 Secondary cutting shaft, 2-2 Secondary cutting intermediate drum, 2-3 Secondary cutting side drums; 3-1 Transmission box housing, 3-2 Bevel gear input shaft, 3-3 Bevel gear train; 4-1 Drive sprocket, 4-2 Driven sprocket, 4-3 Track beam, 4-4 Track, 4-5 Tensioning device; 5-1 First connecting rod, 5-2 Second connecting rod, 5-3 Pin, 5-4 Pneumatic telescopic device, 5-5 Spring damping device; 6-1 Drill pipe box housing, 6-2 Support flange, 6-3 Spiral drill pipe, 6-4 Automatic telescopic mechanism mounting beam. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the application will be further described in detail below with reference to the accompanying drawings. The described embodiments are only a part of the embodiments involved in this invention. All non-innovative embodiments based on these embodiments by other researchers in the art are within the protection scope of this invention. Furthermore, the step numbers in the embodiments of this invention are only set for ease of explanation and do not limit the order of the steps. The execution order of each step in the embodiments can be adaptively adjusted according to the understanding of those skilled in the art.

[0047] In one embodiment of the present invention, such as Figure 1 As shown, the double-drum adaptive coal mining machine cutting head is used in conjunction with a long-distance spiral drill rod coal mining machine. The long-distance spiral drill rod coal mining machine includes a drive unit, a conveying unit, and a traveling unit. The double-drum adaptive coal mining machine cutting head is installed at the front end of the coal mining machine's conveying unit and connected to the drive unit of the coal mining machine. The double-drum adaptive coal mining machine cutting head is responsible for breaking coal and conveying coal at the head, while the spiral drill rod is responsible for conveying coal outwards.

[0048] like Figure 2 As shown in this embodiment, the dual-drum adaptive coal mining machine cutting head includes: a main cutting drum 1, an auxiliary cutting drum 2, a transmission box 3, a tracked cutting section 4, an automatic telescopic mechanism 5, and a first section drill rod box 6.

[0049] Among them, such as Figure 3 and Figure 4 As shown, the main cutting roller 1 includes: a main cutting shaft 1-1, a main cutting intermediate roller 1-2, and main cutting side rollers 1-3; the auxiliary cutting roller 2 includes: an auxiliary cutting shaft 2-1, an auxiliary cutting intermediate roller 2-2, and auxiliary cutting side rollers 2-3; the transmission box 3 includes: a transmission box body 3-1, a bevel gear input shaft 3-2, and a bevel gear train 3-3; the tracked cutting section 4 includes: a drive sprocket 4-1, a driven sprocket 4-2, a track beam 4-3, a track 4-4, and a tensioning device 4-5; the automatic telescopic mechanism 5 includes: a first connecting rod 5-1, a second connecting rod 5-2, a pin 5-3, a pneumatic telescopic device 5-4, and a spring damping device 5-5; and the first drill pipe box 6 includes: a drill pipe box body 6-1, a support flange 6-2, a spiral drill pipe 6-3, and an automatic telescopic mechanism mounting beam 6-4.

[0050] In this embodiment, specifically, the spiral drill rod 6-3 is connected to the drill rod box 6-1 via a support flange 6-2. A bearing is provided between the spiral drill rod 6-3 and the support flange 6-2. The support flange 6-2 and the drill rod box 6-1 are connected by bolts or welding.

[0051] The forward and backward thrust or pull of the cutting head is borne by the drill rod box 6-1, and the spiral drill rod 6-3 only needs to transmit torque. This can solve the problem that the drill rod is prone to deviation during the operation of the spiral drill rod coal mining machine, and improve the transmission efficiency.

[0052] One end of the transmission box 3-1 is bolted to the drill rod box 6-1. The bevel gear input shaft 3-2 is connected to the spiral drill rod 6-3 via an internal spline. The bevel gear train 3-3 is connected to the bevel gear input shaft 3-2 via an external spline at one end and to the main cutting shaft 1-1 at the other end.

[0053] The two ends of the main cutting intermediate roller 1-2 are clamped by the round ends of the transmission box 3-1. The main cutting intermediate roller 1-2 is provided with an internal spline and is connected to the main cutting shaft 1-1. One side of the main cutting side rollers 1-3 is connected to the main cutting intermediate roller 1-2, and an oil seal is provided at the connection. The other side of the main cutting side rollers 1-3 is connected to the main cutting shaft 1-1.

[0054] The drive sprocket 4-1 is installed in the middle of the main cutting intermediate roller 1-2. One end of the track beam 4-3 is installed on both sides of the drive sprocket 4-1, and the other end is installed on both sides of the driven sprocket 4-2. The driven sprocket 4-2 is installed in the middle of the secondary cutting intermediate roller 2-2. The track beam 4-3 is equipped with a tensioning device 4-5. Chains are arranged on the drive sprocket 4-1 and the driven sprocket 4-2, and a track 4-4 is provided on the outside of the chain.

[0055] The secondary cutting shaft 2-1 is connected to the driven sprocket 4-2 via a spline. The secondary cutting intermediate roller 2-2 and the secondary cutting side rollers 2-3 are mounted on the secondary cutting shaft 2-1. The secondary cutting side rollers 2-3 have a slot in the middle position to connect with the automatic telescopic mechanism 5.

[0056] One end of the first connecting rod 5-1 is installed in the circular groove of the rollers 2-3 on both sides of the secondary cutting, and the other end is connected to the second connecting rod 5-2; the second connecting rod 5-2 is connected to the pneumatic telescopic device 5-4 through the pin 5-3; the other end of the pneumatic telescopic device 5-4 is connected to the spring damping device 5-5; the spring damping device 5-5 is welded to the automatic telescopic mechanism mounting beam 6-4.

[0057] Cutting teeth are also arranged on the main cutting roller 1 and the auxiliary cutting roller 2, and cutting teeth are also arranged on the track outside the track of the track cutting section 4 chain.

[0058] In use, the power from the auger drill rod 6-3 is transmitted to the bevel gear input shaft 3-2 via a spline, and then transmitted to the main cutting shaft 1-1 via the bevel gear transmission system in the transmission box 3. The main cutting shaft 1-1 drives the main cutting drum 1 to rotate and cut the coal seam.

[0059] The main cutting intermediate roller 1-2 drives the drive sprocket 4-1 to rotate, and the rotation of the drive sprocket 4-1 drives the crawler cutting section 4 to rotate and cut the coal seam.

[0060] The driven sprocket 4-2 of the track cutting section 4 drives the secondary cutting shaft 2-1 to rotate, and the secondary cutting shaft 2-1 drives the secondary cutting drum 2 to rotate and cut the coal seam.

[0061] The main cutting intermediate drum 1-2 and the main cutting side drums 1-3 are equipped with blades. The main cutting drum 1 is not only responsible for cutting the coal seam, but also for transporting the cut coal blocks to the vicinity of the drill pipe box at the rear, and then the auger drill pipe 6-3 transports the coal outward.

[0062] During the cutting process, such as Figure 5 As shown, the main cutting roller 1, the auxiliary cutting roller 2, the transmission box 3, the track cutting section and the automatic telescopic mechanism 5 form a composite crank-slider mechanism, which is responsible for adjusting the height of the auxiliary cutting roller 2.

[0063] Methods for adjusting the coal mining height using the cutting head, such as... Figure 6 As shown, specifically: During operation, the automatic telescopic mechanism 5 is equipped with a pressure sensor and has a set allowable pressure range. When the auxiliary cutting drum 2 encounters significant coal seam undulations and increased cutting resistance during the cutting process, the sensor detects the change and inputs a signal. The automatic telescopic mechanism 5 then shortens, thereby reducing the coal mining height to adapt to changes in the coal seam. When the propulsion resistance falls below the set allowable range, the automatic telescopic mechanism 5 slowly extends until it returns to the allowable pressure range, ensuring the stability and efficiency of the cutting operation.

[0064] The main cutting drum 1 and the auxiliary cutting drum 2 can be disassembled. When the thickness of the coal seam being mined is less than 0.8m, the auxiliary cutting drum 2 can be disassembled, and only the main cutting drum 1 can be used for cutting.

[0065] In summary, this invention provides a dual-drum adaptive coal mining head, employing a dual-drum structure to adapt to coal seam conditions of varying thicknesses (mining range of 500-1300mm), effectively solving the problems caused by coal seam undulations during complex coal seam mining. Furthermore, the auger drill rod is responsible for coal seam transport, while the first drill rod box is responsible for propulsion, avoiding the drill rod offset problem of traditional auger coal mining machines and effectively improving power transmission efficiency. The use of a bevel gear transmission system and a chain drive system further solves the problem of excessive cutting head weight and downward drill rod offset during cutting, which is often caused by the front-mounted hydraulic motor in traditional auger coal mining machines. Moreover, the mechanical transmission method effectively solves the problem of cumbersome progressive hydraulic pipelines required during propulsion due to the front-mounted cutting motor, ensuring efficient power transmission, reducing energy loss, and improving the stability of coal mining operations.

[0066] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A double drum self-adapting coal cutter head connected to a long distance auger rod coal cutter drive unit, characterized in that, The cutting head comprises a main cutting drum (1), a secondary cutting drum (2), a transmission box (3), a caterpillar cutting part (4), an automatic telescopic mechanism (5), and a first drill rod box (6); The first drill rod box (6) is provided with a spiral drill rod (6-3) therein, and torque from a driving part of the coal mining machine is transmitted to a bevel gear transmission system in the transmission box (3) through the spiral drill rod (6-3), and then transmitted to a main cutting shaft (1-1) in the main cutting drum (1), so that the main cutting drum (1) is driven to rotate to cut the coal seam; The main cutting drum (1) is provided with a sprocket in the middle, and torque of the main cutting drum (1) is transmitted to the secondary cutting drum (2) through the sprocket, so that the secondary cutting drum (2) is driven to rotate to cut the coal seam; The secondary cutting drum (2) adjusts the coal mining height through the automatic telescopic mechanism (5) arranged at the rear, and the automatic telescopic mechanism (5) is provided with a pneumatic spring, which automatically adjusts the height of the secondary cutting drum (2) according to the ups and downs of the coal seam, so that the coal mining machine automatically adjusts the coal mining height; The secondary cutting drum (2) comprises a secondary cutting shaft (2-1), a secondary cutting middle drum (2-2), and secondary cutting side drums (2-3); the secondary cutting middle drum (2-2) and the secondary cutting side drums (2-3) are installed on the secondary cutting shaft (2-1); the secondary cutting side drums (2-3) are provided with grooves in the middle positions and connected with the automatic telescopic mechanism (5); and the secondary cutting shaft (2-1) is connected with the driven sprocket (4-2) through a spline; The caterpillar cutting part (4) comprises a driving sprocket (4-1), a driven sprocket (4-2), a caterpillar beam (4-3), a caterpillar (4-4), and a tension device (4-5); the driving sprocket (4-1) is installed in the middle position of the main cutting middle drum (1-2); one end of the caterpillar beam (4-3) is installed on both sides of the driving sprocket, and the other end is installed on both sides of the driven sprocket (4-2); the driven sprocket (4-2) is installed in the middle position of the secondary cutting middle drum (2-2); the tension device (4-5) is arranged in the caterpillar beam (4-3); and the driving sprocket (4-1) and the driven sprocket (4-2) are provided with chains, and the chains are provided with the caterpillar (4-4) outside; The automatic telescopic mechanism (5) comprises a first connecting rod (5-1), a second connecting rod (5-2), a pin shaft (5-3), a pneumatic telescopic device (5-4), and a spring group device (5-5); one end of the first connecting rod (5-1) is installed in the round groove position of the secondary cutting side drum (2-3), and the other end is connected with the second connecting rod (5-2); the second connecting rod (5-2) is connected with the pneumatic telescopic device (5-4) through the pin shaft (5-3); the other end of the pneumatic telescopic device (5-4) is connected with the spring group device (5-5) for damping; and the spring group device (5-5) is welded on the automatic telescopic mechanism mounting beam (6-4); During the cutting process, the main cutting drum (1), the secondary cutting drum (2), the transmission box (3), the caterpillar cutting part (4), and the automatic telescopic mechanism (5) constitute a composite crank slider mechanism; The automatic telescopic mechanism (5) is further provided with a pressure sensor, which senses the cutting resistance of the secondary cutting drum (2) to control the secondary cutting drum (2) to adaptively adjust the coal mining height according to the change of the coal seam, and specifically includes the following steps: S1, the pressure sensor obtains the cutting resistance of the secondary cutting drum (2), and a pressure threshold range is set; S2, when the pressure sensor detects that the coal seam undulates and the cutting resistance exceeds or is lower than the threshold range during cutting, a signal is output to the automatic telescopic mechanism (5); S3, the automatic telescopic mechanism (5) automatically adjusts the coal mining height to adapt to the change of the coal seam by the elongation or shortening of the pneumatic telescopic device (5-4) and the spring group device (5-5), until the cutting resistance of the secondary cutting drum (2) returns to the pressure threshold range.

2. The dual drum self-adapting coal cutter head of claim 1, wherein, The main cutting drum (1) comprises a main cutting shaft (1-1), a main cutting intermediate drum (1-2), and main cutting two-side drums (1-3); The main cutting intermediate drum (1-2) is provided with an inner spline connected with the main cutting shaft (1-1), and the two ends of the main cutting intermediate drum (1-2) are clamped by the round ends of the transmission box body (3-1); One side of the main cutting two-side drum (1-3) is connected with the main cutting shaft (1-1), and the other side is connected with the main cutting intermediate drum (1-2), and an oil seal is arranged at the connection position.

3. The dual drum self-adapting coal cutter head of claim 2, wherein, The transmission box (3) comprises a transmission box body (3-1), a bevel gear input shaft (3-2), and a bevel gear train (3-3); The square head of the transmission box body (3-1) is connected to the drill rod box body (6-1) by bolts; the bevel gear input shaft (3-2) is connected to the auger (6-3) by an inner spline; one end of the bevel gear train (3-3) is connected to the bevel gear input shaft (3-2) by an outer spline, and the other end is connected to the main cutting shaft (1-1); the bevel gear input shaft (3-2) and the bevel gear train (3-3) constitute a bevel gear transmission system.

4. The dual drum self-adapting coal cutter head of claim 3, wherein, The first joint drill rod box (6) comprises a drill rod box body (6-1), a support flange (6-2), an auger (6-3), and an automatic telescopic mechanism mounting beam (6-4); The auger (6-3) is connected to the drill rod box body (6-1) through the support flange (6-2); a bearing is arranged between the auger (6-3) and the support flange (6-2), and the support flange (6-2) is connected to the drill rod box body (6-1) by bolts or welding; the cutting head front and rear direction thrust or tension is borne by the drill rod box body (6-1), and the torque is transmitted through the auger (6-3).

5. The dual drum self-adapting coal cutter head of claim 4, wherein: The main cutting drum (1), the secondary cutting drum (2), and the track cutting part (4) chain outside the track are provided with cutting teeth for cutting the coal seam; The power from the auger rod (6-3) is transmitted to the bevel gear input shaft (3-2) through the spline, and is transmitted to the main cutting shaft (1-1) through the bevel gear transmission system of the transmission box (3), which drives the main cutting drum (1) to rotate to cut the coal seam; the main cutting intermediate drum (1-2) drives the driving sprocket (4-1) to rotate, which drives the track cutting part (4) to rotate and cut; the track cutting part (4) drives the driven sprocket (4-2) to rotate, which drives the auxiliary cutting shaft (2-1) to rotate, and the auxiliary cutting shaft (2-1) drives the auxiliary cutting drum (2) to rotate and cut.

6. The dual drum self-adapting coal cutter head of claim 1, wherein, The main cutting drum (1) and the auxiliary cutting drum (2) are detachable, and when the thickness of the coal seam is less than 0.8m, the auxiliary cutting drum (2) is detached, and only the main cutting drum (1) is used for cutting; The main cutting intermediate drum (1-2) and the main cutting drum (1-3) on the two sides are also respectively provided with blades with opposite rotation directions, and the cut coal is sent to the rear first joint drill rod box (6) through the auger rod (6-3) to transport the coal.

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