Double-roller self-adaptive cutting head of coal mining machine

Abstract

The invention discloses a double-drum self-adaptive cutting head of a coal mining machine, which comprises a main cutting drum, an auxiliary cutting drum, a transmission case, a crawler belt cutting part, an automatic telescopic mechanism, a first-section drill rod box and the like, and is combined with a driving part of a long-distance spiral drill rod coal mining machine for use. The spiral drill rod drives the main cutting roller to conduct rotary cutting through the bevel gear transmission system, the main cutting roller drives the auxiliary cutting roller to conduct rotary cutting through the chain transmission system, the auxiliary cutting roller adjusts the coal mining height through the automatic telescopic mechanism on the rear portion, and the pneumatic spring system is arranged on the automatic telescopic mechanism. The height of the auxiliary roller can be automatically adjusted according to fluctuating changes of a coal seam, and the coal mining height of the coal mining machine can be adjusted in a self-adaptive mode. The cutting head provided by the invention can effectively cope with fluctuating complex coal seams with the thickness between 0.5 m and 1.3 m, effectively solves the problem of corner coal retention of a traditional drilling type coal mining machine, improves the coal mining efficiency and the resource recovery rate, and adopts a drill rod box mode to reduce the damage of the coal mining machine to a coal roadway bottom plate.

Description

Technical Field

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

[0002] As one of the most important energy sources for mankind, coal has made great contributions to the progress of global material civilization and provided a strong guarantee for the improvement of social productivity. In recent years, the total amount of coal mining in my country has continued to rise, showing that the domestic demand for coal is growing. It is expected that coal will remain the main energy source in my country in the next few decades.

[0003] As coal resources are becoming increasingly scarce, coal mining machine technology for complex coal seams will usher in a broader development space and prospects. Existing thin coal seam coal mining machines, such as continuous mining machines and drill mining machines, have their own advantages and disadvantages under different coal seam conditions. Continuous mining machines are suitable for thicker coal seams, and because their crawlers need to withstand the cutting force and the weight of the machine during operation, frequent movement will cause damage to the coal roadway floor, and they cannot be used for mining extremely thin coal seams. Although drill mining machines are suitable for mining extremely thin coal seams, their coal mining height is limited by the diameter of their drill bits, and the coal mining height cannot be adjusted according to demand. In addition, there are often coal pillars and coal left in the corners between the drill holes, resulting in a low resource recovery rate.

[0004] Therefore, the existing technology has 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 the present invention is to provide a double-drum adaptive coal mining machine cutting head, which can adapt to coal seam conditions of different thicknesses through the double-drum structure, thereby improving the adaptability of the equipment and effectively solving the problem caused by coal seam fluctuations during complex coal seam mining.

[0006] To achieve the above objectives, the present invention adopts the following technical solution, a double-drum adaptive coal mining machine cutting equipment, including: a main cutting drum, an auxiliary cutting drum, a transmission box, a crawler cutting part, an automatic telescopic mechanism, a first section drill rod box, etc.

[0007] The first drill rod box is equipped with a spiral drill rod. The torque from the driving part of the coal mining machine is transmitted to the transmission box through the spiral drill rod, and then transmitted 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] A sprocket is provided in the middle of the main cutting drum. The torque of the main cutting drum is transmitted to the auxiliary cutting drum through the sprocket drive, driving the auxiliary cutting drum to rotate and cut the coal seam.

[0009] The auxiliary cutting drum adjusts the coal mining height through an automatic telescopic mechanism arranged at the rear; a pneumatic spring is arranged on the automatic telescopic mechanism to automatically adjust the height of the auxiliary cutting drum according to the fluctuation of the coal seam, so as to realize the coal mining machine to adaptively adjust the coal mining height.

[0010] Cutting teeth are arranged on the main cutting drum and the auxiliary cutting drum, 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 middle drum, and main cutting drums on both sides; the auxiliary cutting drum includes an auxiliary cutting shaft, an auxiliary cutting middle drum, and auxiliary cutting drums on both sides; the transmission box includes a transmission box body, a bevel gear input shaft, and a bevel gear train; the crawler cutting part includes a driving sprocket, a driven sprocket, a crawler beam, a crawler, 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 group system; the first section drill rod box includes a drill rod box body, a support flange, a spiral drill rod, and an automatic telescopic mechanism mounting beam.

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

[0013] Preferably, the main middle cutting drum and the main side cutting drums are respectively provided with blades, and the rotation directions are opposite; the main cutting drum is not only responsible for cutting the coal seam, but also for transporting coal blocks. The main cutting drum can transport the crushed coal blocks to the vicinity of the rear drill rod box through spiral blades. Since the main middle cutting drum and the main side cutting blades rotate in opposite directions, the transported coal blocks are more concentrated, which is more convenient for subsequent spiral drill rod transportation.

[0014] Preferably, the auxiliary cutting shaft is connected to the driven sprocket through a spline, and the auxiliary cutting middle roller and the auxiliary cutting side rollers are installed on the auxiliary cutting shaft; the auxiliary cutting side rollers are grooved in the middle and connected to the automatic telescopic mechanism.

[0015] Preferably, one end of the square head of the transmission box body is connected to the drill rod box body by bolts, the bevel gear input shaft is connected to the spiral drill rod through an internal spline, and the bevel gear train is connected to the bevel gear input shaft through one end of the external spline, and the other end is connected to the main cutting shaft in the main cutting drum; the transmission box is not only responsible for transmitting torque, but also can support the main cutting drum to rotate and cut.

[0016] Preferably, the driving sprocket is installed in the middle position of the main cutting intermediate drum, and the crawler cutting part is provided with a crawler beam, one end of the crawler beam is installed on both sides of the driving sprocket, and the other end is installed on both sides of the driven sprocket; the driven sprocket is installed in the middle position of the auxiliary cutting intermediate drum, and the torque of the main cutting drum is transmitted to the auxiliary cutting drum through chain transmission, and a tensioning device is provided on the inner side of the crawler beam; chains are arranged on the driving sprocket and the driven sprocket, and a crawler is provided on the outside of the chain, and cutting teeth are provided on the crawler, and when the main and auxiliary cutting drums rotate, the crawler cutting part is responsible for cutting the middle section of the coal.

[0017] Preferably, one end of the first connecting rod is installed at the circular groove position of the drum on both sides of the auxiliary cutting drum, connected to the auxiliary cutting drum, 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 shaft; the other end of the pneumatic telescopic device is connected to the spring group device, and the spring group device is welded on the mounting beam of the automatic telescopic mechanism;

[0018] The pneumatic expansion device and the spring group device constitute a pneumatic spring system, which can adjust the length according to the pressure. The pneumatic expansion device can be extended or shortened, and the spring group system can absorb vibration and play a vibration reduction role.

[0019] Preferably, a pressure sensor is also arranged on the automatic telescopic mechanism and is provided with an allowable pressure range so as to detect changes in the propulsion resistance of the auxiliary cutting drum.

[0020] Preferably, the auger drill rod is supported by a drill rod box, which 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, and the support flange and the drill rod box body are connected by bolts or welding; the forward and backward thrust or pulling force of the cutting head is borne by the drill rod box body, and the drill rod box can absorb the cutting resistance and gravity of the main and auxiliary cutting drums well, and can adapt to more complex bottom plate conditions. The auger drill rod only needs to transmit torque, which improves the transmission efficiency.

[0021] Furthermore, the power from the auger is transmitted to the bevel gear input shaft through the spline, and then transmitted to the main cutting shaft 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.

[0022] The main cutting intermediate drum drives the driving sprocket to rotate, and the rotation of the driving sprocket drives the crawler cutting part to rotate and cut the coal seam;

[0023] The driven sprocket of the crawler cutting part drives the auxiliary cutting shaft to rotate, and the auxiliary cutting shaft drives the auxiliary cutting drum to rotate and cut the coal seam.

[0024] Furthermore, the transmission box, the main cutting drum, the crawler beam, the auxiliary cutting drum and the automatic telescopic mechanism form a composite crank slider mechanism.

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

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

[0027] When the mining range of the coal seam becomes higher, the pneumatic spring system slowly lengthens, and the height of the auxiliary cutting drum slowly rises and gradually reaches the predetermined position. The specific steps are as follows:

[0028] S1, the pressure sensor obtains the cutting resistance of the auxiliary cutting drum and sets the pressure allowable range;

[0029] S2. When the auxiliary cutting drum encounters large coal seam fluctuations and increased cutting resistance during the cutting process, the sensor detects the change and inputs a signal;

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

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

[0032] The beneficial effects of the present invention, compared with the prior art, the present invention has the following advantages:

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

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

[0035] 3. In traditional long-distance drilling coal mining machines, since a hydraulic motor is set at the position of the cutting head, it is necessary to continuously advance the hydraulic pipeline when moving forward, which makes the operation very cumbersome. The double-drum adaptive coal mining machine cutting head of the present invention adopts a combination of a bevel gear transmission system and a chain transmission system to replace the front hydraulic motor, and there is no need to advance the hydraulic pipeline, making the operation easier.

[0036] 4. The double-drum adaptive coal mining machine cutting head of the present invention adopts transverse axis milling to solve the problem of coal retention in corners of traditional drilling coal mining machines, and adopts a drill rod box to reduce the damage of the coal mining machine to the bottom plate of the coal roadway, and has strong adaptability and safety.

[0037] 5. The double-drum adaptive coal mining machine cutting head of the present invention adopts two main and auxiliary cutting drums, which has a large cutting section and higher efficiency. The auxiliary cutting drum can be disassembled, and thinner coal seams can be mined through the main cutting drum. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0040] Figure 3 It is the parts assembly diagram of the double-drum adaptive coal mining machine cutting head of the present invention;

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

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

[0043] Figure 6 This is a control flow chart of the variable mining height of the cutting head of the double-drum adaptive coal mining machine of the present invention;

[0044] Description of reference numerals:

[0045] 1 main cutting drum, 2 auxiliary cutting drum, 3 transmission box, 4 crawler cutting part, 5 automatic telescopic mechanism, 6 first section drill pipe box; 1-1 main cutting shaft, 1-2 main cutting middle drum, 1-3 main cutting drums on both sides; 2-1 auxiliary cutting shaft, 2-2 auxiliary cutting middle drum, 2-3 auxiliary cutting drums on both sides; 3-1 transmission box body, 3-2 bevel gear input shaft, 3-3 bevel gear train; 4-1 driving sprocket, 4-2 driven sprocket, 4-3 crawler beam, 4-4 crawler, 4-5 tensioning device; 5-1 first connecting rod, 5-2 second connecting rod, 5-3 pin shaft, 5-4 pneumatic telescopic device, 5-5 spring group ni device; 6-1 drill pipe box body, 6-2 supporting flange, 6-3 spiral drill rod, 6-4 automatic telescopic mechanism mounting beam. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the application is further elaborated in detail below in conjunction with the accompanying drawings. The described embodiments are only a part of the embodiments involved in the present invention. All non-innovative embodiments of other researchers in the field on this embodiment belong to the protection scope of the present invention. At the same time, for the step numbering in the embodiment of the present invention, it is only set for the convenience of explanation, and the order between the steps is not limited in any way. The execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0047] In one embodiment of the present invention, Figure 1 As shown, the double-drum adaptive shearer cutting head is used in conjunction with the long-distance spiral drill rod shearer. The long-distance spiral drill rod shearer includes a driving part, a conveying part and a walking part. The double-drum adaptive shearer cutting head is installed at the front end of the shearer conveying part and connected to the driving part of the shearer. The double-drum adaptive shearer cutting head is responsible for breaking coal and conveying coal at the head, and the spiral drill rod is responsible for conveying coal outward.

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

[0049] Among them, Figure 3 and Figure 4 As shown, the main cutting drum 1 includes: a main cutting shaft 1-1, a main cutting middle drum 1-2, and main cutting drums on both sides 1-3; the auxiliary cutting drum 2 includes: an auxiliary cutting shaft 2-1, an auxiliary cutting middle drum 2-2, and auxiliary cutting drums on both sides 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 crawler cutting part 4 includes: a driving sprocket 4-1, a driven sprocket 4-2, a crawler beam 4-3, a crawler 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 shaft 5-3, a pneumatic telescopic device 5-4, and a spring group ni device 5-5; the first section drill rod box 6 includes: a drill rod box body 6-1, a support flange 6-2, a spiral drill rod 6-3, and an automatic telescopic mechanism mounting beam 6-4.

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

[0051] The thrust or pulling force in the front and rear directions of the cutting head is borne by the drill rod box body 6-1, and the spiral drill rod 6-3 only needs to transmit torque, which can solve the problem that the drill rod of the spiral drill rod coal mining machine is prone to deviation during operation and improve the transmission efficiency.

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

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

[0054] The driving 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 driving 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 auxiliary cutting intermediate roller 2-2; a tensioning device 4-5 is provided inside the track beam 4-3, chains are arranged on the driving sprocket 4-1 and the driven sprocket 4-2, and a track 4-4 is provided outside the chain.

[0055] The auxiliary cutting shaft 2-1 is connected to the driven sprocket 4-2 through a spline, and the auxiliary cutting middle roller 2-2 and the auxiliary cutting side rollers 2-3 are installed on the auxiliary cutting shaft 2-1; the auxiliary cutting side rollers 2-3 are grooved in the middle position and connected to the automatic telescopic mechanism 5.

[0056] One end of the first connecting rod 5-1 is installed in the circular groove position of the roller 2-3 on both sides of the auxiliary 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 shaft 5-3; the other end of the pneumatic telescopic device 5-4 is connected to the spring group device 5-5; the spring group device 5-5 is welded on the automatic telescopic mechanism mounting beam 6-4.

[0057] Picking teeth are also arranged on the main cutting drum 1 and the auxiliary cutting drum 2, and picking teeth are also arranged on the crawler belt outside the chain of the crawler belt cutting part 4.

[0058] When in use, the power from the auger rod 6-3 is transmitted to the bevel gear input shaft 3-2 through the spline, and then transmitted to the main cutting shaft 1-1 through 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 drum 1-2 drives the driving sprocket 4-1 to rotate, and the rotation of the driving sprocket 4-1 drives the crawler cutting part 4 to rotate and cut the coal seam.

[0060] The driven sprocket 4-2 of the crawler cutting part 4 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 the coal seam.

[0061] The main cutting middle drum 1-2 and the main cutting side drums 1-3 are provided with blades. The main cutting drum 1 is not only responsible for cutting the coal seam, but also needs to transport the cut coal blocks to the vicinity of the rear drill rod box, and then the spiral drill rod 6-3 transports the coal outward.

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

[0063] Methods for adjusting the coal mining height of the cutting head, such as Figure 6 As shown, the details are as follows: During the operation of the cutting head, a pressure sensor is installed on the automatic telescopic mechanism 5, and a pressure allowable range is set. When the auxiliary cutting drum 2 encounters large fluctuations in the coal seam and increased cutting resistance during the cutting process, the sensor detects the change and inputs a signal, and the automatic telescopic mechanism 5 will shorten, thereby reducing the coal mining height to adapt to the change in the coal seam. When the propulsion resistance is lower than the set allowable range, the automatic telescopic mechanism 5 will slowly extend until it returns to the pressure allowable 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 mined coal seam is less than 0.8m, the auxiliary cutting drum 2 is disassembled and only the main cutting drum 1 is used for cutting.

[0065] In summary, the present invention is a double-drum adaptive coal mining machine cutting head, which adopts a double-drum structure and can adapt to coal seam conditions of different thicknesses (the mining range is 500-1300mm), effectively solving the problem of coal seam fluctuations during complex coal seam mining. In addition, the spiral drill rod is responsible for the transportation of the coal seam, and the first section of the drill rod box is responsible for the propulsion, which avoids the problem of drill rod deviation of the traditional spiral drill coal mining machine and effectively improves the power transmission efficiency. The bevel gear transmission system and the chain transmission system are further adopted to solve the problem of the cutting head being too heavy and the overall downward deviation of the drill rod during the cutting process caused by the front hydraulic motor of the traditional spiral drill coal mining machine. And the mechanical transmission method is adopted to effectively solve the problem of the need for cumbersome progressive hydraulic pipelines during the propulsion process due to the front cutting motor, ensuring the efficient transmission of power, reducing energy loss, and improving the stability of coal mining operations.

[0066] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A double-drum adaptive shearer cutting head connected to a long-distance spiral drill rod shearer drive unit, characterized in that: The cutting head comprises: a main cutting drum (1), an auxiliary cutting drum (2), a transmission box (3), a crawler cutting part (4), an automatic telescopic mechanism (5), and a first section drill rod box (6); The first drill rod box (6) is provided with a spiral drill rod (6-3), and the torque from the coal mining machine driving unit is transmitted to the bevel gear transmission system in the transmission box (3) through the spiral drill rod (6-3), and then transmitted to the main cutting shaft (1-1) in the main cutting drum (1), and the main cutting shaft (1-1) drives the main cutting drum (1) to rotate and cut the coal seam; A sprocket is provided in the middle of the main cutting drum (1), and the torque of the main cutting drum (1) is transmitted to the auxiliary cutting drum (2) through the sprocket, thereby driving the auxiliary cutting drum (2) to rotate and cut the coal seam; The auxiliary cutting drum (2) adjusts the coal mining height through an automatic telescopic mechanism (5) arranged at the rear; the automatic telescopic mechanism (5) is provided with a pneumatic spring, which automatically adjusts the height of the auxiliary cutting drum (2) according to the fluctuation of the coal seam, thereby realizing the coal mining machine's adaptive adjustment of the coal mining height.

2. The double-drum adaptive coal mining machine cutting head according to claim 1 is characterized in that: The main cutting drum (1) comprises: a main cutting shaft (1-1), a main cutting middle drum (1-2), and main cutting drums on both sides (1-3); The main cutting intermediate drum (1-2) is provided with an internal spline and connected to the main cutting shaft (1-1); 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 rollers (1-3) is connected to the main cutting shaft (1-1), and the other side is connected to the main cutting middle roller (1-2), and an oil seal is provided at the connection.

3. The double-drum adaptive coal mining machine cutting head according to claim 2 is characterized in that: The auxiliary cutting drum (2) comprises: an auxiliary cutting shaft (2-1), an auxiliary cutting middle drum (2-2), and auxiliary cutting drums on both sides (2-3); The auxiliary cutting middle roller (2-2) and the auxiliary cutting side rollers (2-3) are installed on the auxiliary cutting shaft (2-1); the auxiliary cutting side rollers (2-3) are slotted in the middle and connected to the automatic telescopic mechanism (5); the auxiliary cutting shaft (2-1) is connected to the driven sprocket (4-2) via a spline.

4. The double-drum adaptive coal mining machine cutting head according to claim 3 is characterized in that: 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); One end of 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 spiral drill rod (6-3) by internal splines; one end of the bevel gear train (3-3) is connected to the bevel gear input shaft (3-2) by external splines, 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.

5. The double-drum adaptive coal mining machine cutting head according to claim 4 is characterized in that: The crawler cutting part (4) comprises: a driving sprocket (4-1), a driven sprocket (4-2), a crawler beam (4-3), a crawler (4-4), and a tensioning device (4-5); The driving sprocket (4-1) is installed at the middle position of the main cutting intermediate roller (1-2); one end of the crawler beam (4-3) is installed on both sides of the driving sprocket of the crawler beam (4-3), and the other end is installed on both sides of the driven sprocket (4-2); the driven sprocket (4-2) is installed at the middle position of the auxiliary cutting intermediate roller (2-2); a tensioning device (4-5) is arranged on the inner side of the crawler beam (4-3); chains are arranged on the driving sprocket (4-1) and the driven sprocket (4-2), and a crawler (4-4) is arranged outside the chain.

6. The double-drum adaptive coal mining machine cutting head according to claim 5, characterized in that: 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 system (5-5); One end of the first connecting rod (5-1) is installed at the circular groove position 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 a pin shaft (5-3); the other end of the pneumatic telescopic device (5-4) is connected to a spring group device (5-5) for vibration reduction; the spring group device (5-5) is welded to the automatic telescopic mechanism mounting beam (6-4); During the cutting process, the main cutting drum (1), the auxiliary cutting drum (2), the transmission box (3), the crawler cutting part (4) and the automatic telescopic mechanism (5) form a composite crank slider mechanism.

7. The double-drum adaptive coal mining machine cutting head according to claim 6 is characterized in that: The first section drill rod box (6) comprises: a drill rod box body (6-1), a support flange (6-2), a spiral drill rod (6-3), and an automatic telescopic mechanism mounting beam (6-4); The spiral drill rod (6-3) is connected to the drill rod box body (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 body (6-1) are connected via bolts or welding; the thrust or pulling force of the cutting head in the front and rear directions is borne by the drill rod box body (6-1), and the torque is transmitted via the spiral drill rod (6-3).

8. The double-drum adaptive coal mining machine cutting head according to claim 7, characterized in that: The main cutting drum (1), the auxiliary cutting drum (2) and the crawler belt outside the crawler belt cutting part (4) chain are provided with cutting teeth for cutting the coal seam; The power from the spiral drill rod (6-3) is transmitted to the bevel gear input shaft (3-2) through the spline, and the power is transmitted to the main cutting shaft (1-1) through the bevel gear transmission system of the transmission box (3), and the main cutting shaft (1-1) drives the main cutting drum (1) to rotate and cut the coal seam; the main cutting intermediate drum (1-2) drives the driving sprocket (4-1) to rotate, and the driving sprocket (4-1) rotates to drive the crawler cutting part (4) to rotate and cut; the crawler cutting part (4) drives the auxiliary cutting shaft (2-1) to rotate through the driven sprocket (4-2), and the auxiliary cutting shaft (2-1) drives the auxiliary cutting drum (2) to rotate and cut.

9. The double-drum adaptive coal mining machine cutting head according to claim 8, characterized in that: The automatic telescopic mechanism (5) is also provided with a pressure sensor, which senses the cutting resistance of the auxiliary cutting drum (2) and controls the auxiliary cutting drum (2) to adaptively adjust the coal mining height according to the change of the coal seam, specifically comprising the following steps: S1, a pressure sensor obtains the cutting resistance of the auxiliary cutting drum (2) and sets a pressure threshold range; S2. When the pressure sensor detects that the coal seam fluctuates during the cutting process and the cutting resistance exceeds or falls below a threshold range, it outputs a signal 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 extending or shortening the pneumatic telescopic device (5-4) and the spring group device (5-5), until the cutting resistance of the auxiliary cutting drum (2) returns to the pressure threshold range.

10. The double-drum adaptive coal mining machine cutting head according to claim 1, characterized in that: The main cutting drum (1) and the auxiliary cutting drum (2) are detachable. When the thickness of the coal seam is less than 0.8 m, the auxiliary cutting drum (2) is detached and cutting is performed only by the main cutting drum (1); The main cutting middle roller (1-2) and the main cutting side rollers (1-3) are also provided with blades respectively, and the blades rotate in opposite directions, so as to send the cut coal blocks to the first drill rod box (6) at the rear, and transport the coal blocks through the spiral drill rod (6-3).

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