Power-distributable cantilever type heading machine cutting head

Abstract

The invention provides a power-distributable cantilever type heading machine cutting head which comprises a mounting frame mounted on a cantilever of a cantilever type heading machine, a shell is rotatably mounted on the outer side of the mounting frame, and a plurality of spirally-distributed cutting teeth are mounted on the outer side of the shell through cutting tooth seats. The shell comprises a rear section shell rotationally mounted on the rear section of the mounting frame, a middle section shell rotationally mounted on the middle section of the mounting frame and a front section shell rotationally mounted on the front section of the mounting frame; the rear-section shell is connected with a first hydraulic motor through a first gear transmission mechanism; the middle shell is connected with a second hydraulic motor through a second gear transmission mechanism; and the front-section shell is connected with a third hydraulic motor through a third gear transmission structure. By adjusting the loop flow of the hydraulic motor corresponding to each section of shell, the output torque is controlled and adjusted, different torques are distributed to each section of shell in real time, and the power distributable tunneling operation of the cutting head of the tunneling machine is realized, so that the problem of power waste of the cutting head in the tooth entering stage is solved, and the tunneling efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of cantilever type roadheaders, and in particular to a cantilever type roadheader cutting head capable of distributing power. Background Art

[0002] A roadheader is a combined unit that can simultaneously complete rock cutting, loading and transportation. According to the different cutting methods of the working face, roadheaders can be divided into full-face roadheaders and partial-face roadheaders. With the development of automation, intelligence and informatization of roadheaders, people have higher and higher requirements for the tunneling performance of roadheaders. The cutting head is the main operating component of the roadheader. The traditional cutting head is an integrated structure, consisting of a cutting head body, spiral blades and a pick seat. The pick seat and spiral blades are welded to the head body, and the pick is installed in the tooth seat. When the cutting head is in operation, the telescopic cantilever propulsion cylinder pushes the groove into the teeth longitudinally, and then the lifting mechanism and the slewing mechanism drive it to swing and cut the working face in the vertical and horizontal directions. When cutting longitudinally, the front end of the rotating cutting head cuts the rock wall, and the rear end idles outside the working face and does not participate in cutting. At this time, the front end needs a large power output to enter the teeth, and the idling of the rear end disperses part of the power and causes waste. After entering the teeth, when cutting horizontally, the front end of the cutting head also idles at the rear end, causing power output loss. To this end, it is necessary to design a segmented power-distributable cutting head that can meet different cutting depths, avoid power output waste, and improve the cutting efficiency and adaptability of the tunnel boring machine. Summary of the invention

[0003] The purpose of the present invention is to provide a cantilevered roadheader cutting head with distributable power, by designing the housing on the outside of the mounting frame into a multi-section structure, and each section of the housing is driven by a hydraulic motor and a gear transmission mechanism, and the output torque is adjusted by flow control, and different torques are distributed to each section of the housing in real time, so as to achieve the roadheader cutting head power distributable roadheading operation, thereby solving the problem of cutting head power waste in the tooth entry stage and improving roadheading efficiency. In order to achieve the above technical features, the purpose of the present invention is achieved as follows: A power distributable cantilever roadheader cutting head, comprising a mounting frame mounted on the cantilever of the cantilever roadheader, a shell rotatably mounted on the outer side of the mounting frame, a plurality of picks distributed in a spiral shape mounted on the outer side of the shell through a pick seat, the shell comprising a rear section shell rotatably mounted on the rear section of the mounting frame, a middle section shell rotatably mounted on the middle section of the mounting frame, and a front section shell rotatably mounted on the front section of the mounting frame; The rear section housing is connected to the first hydraulic motor via a first gear transmission mechanism; The middle section housing is connected to the second hydraulic motor via a second gear transmission mechanism; The front section housing is connected to the third hydraulic motor via a third gear transmission structure; The first hydraulic motor, the second hydraulic motor and the third hydraulic motor are connected to the hydraulic system through hydraulic pipelines respectively.

[0004] The first gear transmission mechanism includes a first planet carrier, a first sun gear, and a first planet gear; The mounting frame includes a rear-section mounting frame connected to the cantilever of the cantilever type tunnel boring machine, the first planetary carrier is installed on the top of the rear-section mounting frame, the first sun gear installed on the first planetary carrier is connected to the output shaft of the first hydraulic motor installed on the first planetary carrier, and the first slewing support bearing is installed on the top of the rear-section mounting frame, the inner side of the support inner ring of the first slewing support bearing is provided with a first gear part meshing with the first planetary gear, the first planetary gear is meshed with the first sun gear, and the support inner ring of the first slewing support bearing is connected to the rear-section housing.

[0005] The second gear transmission mechanism includes a second planet carrier, a second sun gear, and a second planet gear; The mounting frame includes a middle-section mounting frame installed on the top of the first planetary carrier, the second planetary carrier is installed on the top of the middle-section mounting frame, the second sun gear installed on the second planetary carrier is connected to the output shaft of the second hydraulic motor installed on the second planetary carrier, and a second slewing support bearing is installed on the top of the middle-section mounting frame. The inner side of the supporting inner ring of the second slewing support bearing is provided with a second gear part meshing with the second planetary gear, the second planetary gear is meshed with the second sun gear, and the supporting inner ring of the second slewing support bearing is connected to the middle-section housing.

[0006] The third gear transmission mechanism includes a third planet carrier, a third sun gear, and a third planet gear; The mounting frame includes a front-section mounting frame installed on the top of the second planetary frame, the third planetary frame is installed on the top of the front-section mounting frame, the third sun gear installed on the third planetary frame is connected to the output shaft of the third hydraulic motor installed on the third planetary frame, and a third slewing support bearing is installed on the top of the front-section mounting frame. The inner side of the supporting inner ring of the third slewing support bearing is provided with a third gear part meshing with the third planetary gear, the third planetary gear is meshed with the third sun gear, and the supporting inner ring of the third slewing support bearing is connected to the middle-front section housing.

[0007] A first shock-absorbing pad is provided between the first hydraulic motor and the first planetary carrier, a second shock-absorbing pad is provided between the second hydraulic motor and the second planetary carrier, and a third shock-absorbing pad is provided between the third hydraulic motor and the third planetary carrier.

[0008] A power distribution method for the cutting head of an allocatable power cantilever roadheader, comprising the following steps: Step1: When the roadheader is working, the hydraulic power system controls the first hydraulic motor, the second hydraulic motor, and the third hydraulic motor respectively, and then drives the housing to rotate through the corresponding gear transmission mechanisms respectively, so that the picks on the housing cut and break the rock. According to the speed of breaking the rock, adjust the speed and torque of the hydraulic motor, control the speed and torque on the housing, concentrate the system power, and improve the pick efficiency of the cut-in groove; Step2: When the roadheader breaks the section rock, first complete the cut-in groove of the rock face, and then move the cutting head along the rock face direction. During the cut-in groove operation, the hydraulic power will be distributed according to the cut-in groove depth Ht: If 0 < Ht < H1, when the cut-in groove depth Ht is less than the maximum working depth H1 of the picks on the front section housing, control the hydraulic power system to supply oil only to the third hydraulic motor and adjust according to the requirements of Step1; If H1 < Ht < H2, when the cut-in groove depth Ht is greater than the maximum working depth H1 of the picks on the front section housing but less than the maximum working depth H2 of the picks on the middle section housing, control the hydraulic power system to supply oil only to the third hydraulic motor and the second hydraulic motor and adjust according to the requirements of Step1; If H2 < Ht < H3, when the cut-in groove depth Ht is greater than the maximum working depth H2 of the picks on the middle section housing but less than the maximum working depth H3 of the picks on the rear section housing, control the hydraulic power system to supply oil to all hydraulic motors and adjust according to the requirements of Step1; Among them, the cut-in groove depth Ht is the distance from the broken rock face to the section rock face; the maximum working depth H1 of the picks on the front section housing is the maximum vertical distance from the pick head on the front section housing to the end face of the front section housing; the maximum working depth H2 of the picks on the middle section housing is the maximum vertical distance from the pick head on the front section housing to the far end face of the middle section housing; the maximum working depth H3 of the picks on the rear section housing is the maximum vertical distance from the pick head on the front section housing to the far end face of the rear section housing; Step3: After completing the cut-in groove operation, it is necessary to perform transverse crushing operation on the groove surface. The roadheader moves the cutting head horizontally or vertically along the rock face direction, and compares the thickness Hp of the broken section with the maximum working depth H1 of the picks on the front section housing, the maximum working depth H2 of the picks on the middle section housing, and the maximum working depth H3 of the picks on the rear section housing; If 0 < Hp < H1, when the thickness of the broken section is less than the maximum working depth of the front cutting head mechanism, control the hydraulic power system to supply oil only to the third hydraulic motor and adjust according to the requirements of Step1; If H1 < Hp < H2, where the thickness of the broken section is greater than the maximum working depth of the front cutting head mechanism but less than that of the middle cutting head mechanism, then control the hydraulic power system to supply oil only to the third hydraulic motor and the second hydraulic motor, and adjust according to the requirements of Step1; If H2 < Hp < H3, where the thickness of the broken section is greater than the maximum working depth of the middle cutting head mechanism but less than that of the rear cutting head mechanism, then control the hydraulic power system to supply oil to all hydraulic motors for operation, and adjust according to the requirements of Step1; Among them, the thickness Hp of the broken section is the vertical distance from the point on the groove hole surface formed after cutting to the section rock; Step4: After completing the work of the broken section rock once, repeat the above Steps 1 to 3 for the next tunneling operation.

[0009] The device of the present invention includes a mounting frame installed on the boom of a roadheader. A housing is rotatably installed on the outside of the mounting frame. A plurality of cutters distributed in a spiral shape are installed on the outside of the housing through cutter seats. The housing includes a rear housing rotatably installed on the rear section of the mounting frame, a middle housing rotatably installed on the middle section of the mounting frame, and a front housing rotatably installed on the front section of the mounting frame. The rear housing is connected to the first hydraulic motor through a first gear transmission mechanism. The middle housing is connected to the second hydraulic motor through a second gear transmission mechanism. The front housing is connected to the third hydraulic motor through a third gear transmission structure. The first hydraulic motor, the second hydraulic motor, and the third hydraulic motor are respectively connected to the hydraulic system through hydraulic pipelines. The housing outside the mounting frame of the present invention is designed as a multi-section structure, and each section of the housing is driven by a hydraulic motor and a gear transmission mechanism. By adjusting the circuit flow of the hydraulic motor corresponding to each section of the housing, the output torque is controlled and adjusted, and different torques are allocated to each segmented housing in real time, realizing the power-distributable tunneling operation of the roadheader cutting head, thereby solving the problem of power waste of the cutting head during the tooth entry stage and improving the tunneling efficiency. Description of the Drawings

[0010] The present invention will be further described below with reference to the drawings and embodiments.

[0011] Figure 1 It is the overall view of a power-distributable cantilever roadheader cutting head provided by an embodiment of the present invention; Figure 2 It is the external view of a power-distributable cantilever roadheader cutting head provided by an embodiment of the present invention; Figure 3 It is the cross-sectional view of a power-distributable cantilever roadheader cutting head provided by an embodiment of the present invention; Figure 4 It is the exploded front view of the front section structure of a power-distributable cantilever roadheader cutting head provided by an embodiment of the present invention; Figure 5 An exploded isometric diagram of the front section structure of a cantilevered roadheader cutting head capable of distributing power provided by an embodiment of the present invention; Figure 6 It is an exploded front view of a middle section structure of a cutting head of a cantilever type roadheader with distributable power provided by an embodiment of the present invention; Figure 7 It is an exploded isometric diagram of a mid-section structure of a cutting head of a cantilevered roadheader with distributable power provided by an embodiment of the present invention; Figure 8 It is an exploded front view of a rear section structure of a cutting head of a cantilever type roadheader with distributable power provided by an embodiment of the present invention; Fig. 9 It is an exploded isometric diagram of a rear section structure of a cutting head of a cantilever roadheader with distributable power provided by an embodiment of the present invention; In the figure: hydraulic system 101, hydraulic pipeline 102, first hydraulic motor 301, first shock absorbing pad 302, first planetary carrier 303, first slewing bearing outer ring 304, first slewing bearing inner ring, first planetary gear 306, first rotating shaft 307, first sun gear 308, rear section housing 309, first bolt 310, second bolt 311, third type bolt 312, fourth bolt 313, first pin 314, first bearing 315, rear section mounting frame 201, second hydraulic motor 401, second shock absorbing pad 402, middle section mounting frame 403, second slewing bearing inner ring 404, second slewing bearing outer ring 405, second planetary carrier 406, second planetary gear 407, second rotating shaft 408, second sun gear 409, middle section outer ring Shell 410, first pin shaft 411, second pin shaft 412, fifth bolt 413, sixth bolt 414, seventh bolt 415, eighth bolt 416, ninth bolt 417, second bearing 418, third hydraulic motor 501, front section mounting frame 502, third shock absorbing pad 503, third planetary carrier 504, third planetary gear 505, third sun gear 506, third slewing bearing outer ring 507, third slewing bearing inner ring 508, baffle 509, planetary carrier baffle 510, front section housing 511, tenth bolt 512, eleventh bolt 513, twelfth bolt 514, thirteenth bolt 515, fourteenth bolt 516, third bearing 517, wear-resistant baffle 202, pick seat 601, pick 602, spiral baffle 603; The maximum working depth H1 of the pick on the front shell is the maximum vertical distance from the head of the pick on the front shell to the end face of the front shell; The maximum working depth H2 of the pick on the middle shell is the maximum vertical distance from the head of the pick on the front shell to the distal end of the middle shell; The maximum working depth H3 of the pick on the rear shell section is the maximum vertical distance from the head of the pick on the front shell section to the distal end surface of the rear shell section. DETAILED DESCRIPTION

[0012] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.

[0013] See attached Figure 1-9 , a distributable power cantilever roadheader cutting head, comprising a mounting frame installed on the cantilever of the cantilever roadheader, a shell being rotatably installed on the outer side of the mounting frame, a plurality of spirally distributed cutting teeth 602 being installed on the outer side of the shell through a cutting tooth seat 601, the shell comprising a rear section shell 309 rotatably installed on the rear section of the mounting frame, a middle section shell rotatably installed on the middle section of the mounting frame, and a front section shell 511 rotatably installed on the front section of the mounting frame; the rear section shell 309 is connected to the first hydraulic motor 301 through a first gear transmission mechanism; the middle section shell is connected to the second hydraulic motor 401 through a second gear transmission mechanism; the front section shell 511 is connected to the third hydraulic motor 501 through a third gear transmission structure; the first hydraulic motor 301, the second hydraulic motor 401 and the third hydraulic motor 501 are respectively connected to the hydraulic system 101 through hydraulic pipelines 102. The present invention designs the shell on the outside of the mounting frame as a multi-section structure, and each section of the shell is driven by a corresponding hydraulic motor and a gear transmission mechanism. The output torque is controlled and adjusted by adjusting the circuit flow of the hydraulic motor corresponding to each section of the shell, and different torques are allocated to each section of the shell in real time, so that the power of the cutting head of the tunnel boring machine can be allocated to the tunneling operation, thereby solving the problem of power waste of the cutting head in the tooth entering stage and improving the tunneling efficiency.

[0014] Furthermore, the first gear transmission mechanism includes a first planetary carrier 303, a first sun gear 308, and a first planetary gear 306; the mounting frame includes a rear section mounting frame 201 connected to the cantilever of the cantilever tunneling machine, the first planetary carrier 303 is installed on the top of the rear section mounting frame 201, the first sun gear 308 installed on the first planetary carrier 303 is connected to the output shaft of the first hydraulic motor 301 installed on the first planetary carrier 303, and a first slewing support bearing is installed on the top of the rear section mounting frame 201, and the inner side of the supporting inner ring of the first slewing support bearing is provided with a first gear part meshing with the first planetary gear 306, the first planetary gear 306 is meshed with the first sun gear 308, and the supporting inner ring of the first slewing support bearing is connected to the rear section housing 309. When the first hydraulic motor 301 drives the first sun gear 308 to rotate, power is transmitted to the supporting inner ring of the first slewing bearing through the first planetary gear 306 in the fixed first planetary carrier 303, thereby driving the rear section housing 309 to rotate, and its rotation direction is opposite to that of the first hydraulic motor 301.

[0015] Furthermore, the second gear transmission mechanism includes a second planetary carrier 406, a second sun gear 409, and a second planetary gear 407; the mounting frame includes a middle mounting frame 403 mounted on the top of the first planetary carrier 303, the second planetary carrier 406 is mounted on the top of the middle mounting frame 403, the second sun gear 409 mounted on the second planetary carrier 406 is connected to the output shaft of the second hydraulic motor 401 mounted on the second planetary carrier 406, the second slewing support bearing is mounted on the top of the middle mounting frame 403, and the second slewing support shaft The inner side of the support inner ring 404 of the bearing is provided with a second gear portion meshing with the second planetary gear 407, the second planetary gear 407 meshes with the second sun gear 409, and the support inner ring 404 of the second slewing support bearing is connected to the middle section housing. When the second hydraulic motor 401 drives the second sun gear 409 to rotate, the second planetary gear 407 meshing therewith rotates, and the second slewing support inner ring 404 meshing with the second planetary gear 407 also rotates, thereby driving the middle section housing 410 to rotate, and its rotation direction is opposite to that of the second hydraulic motor 401.

[0016] Furthermore, the third gear transmission mechanism includes a third planetary carrier 504, a third sun gear 506, and a third planetary gear 505; the mounting frame includes a front section mounting frame 502 mounted on the top of the second planetary carrier 406, the third planetary carrier 504 is mounted on the top of the front section mounting frame 502, the third sun gear 506 mounted on the third planetary carrier 504 is connected to the output shaft of the third hydraulic motor 501 mounted on the third planetary carrier 504, and a third slewing support bearing is mounted on the top of the front section mounting frame 502, and the inner side of the support inner ring 508 of the third slewing support bearing is provided with a third gear part meshing with the third planetary gear 505, the third planetary gear 505 is meshed with the third sun gear 506, and the support inner ring 508 of the third slewing support bearing is connected to the middle and front section housing 511. When the third hydraulic motor 501 drives the third sun gear 506 to rotate, the third planetary gear 505 meshing therewith rotates, and the third slewing bearing inner ring 508 meshing with the third planetary gear 505 also rotates, thereby driving the front section housing 511 to rotate in a direction opposite to that of the third hydraulic motor 501.

[0017] Furthermore, a first shock-absorbing pad 302 is provided between the first hydraulic motor 301 and the first planetary carrier 303 , a second shock-absorbing pad 402 is provided between the second hydraulic motor 401 and the second planetary carrier 406 , and a third shock-absorbing pad 503 is provided between the third hydraulic motor 501 and the third planetary carrier 504 .

[0018] Furthermore, the spiral baffle 603 is fixed to the outer shell between the pick seats 601 by welding to guide the debris and reduce the generation of dust.

[0019] A method for distributing power to a cutting head of a cantilever type roadheader capable of distributing power comprises the following steps: Step 1: When the roadheader is working, the hydraulic power system controls the first hydraulic motor 301, the second hydraulic motor 401, and the third hydraulic motor 501 respectively, and then drives the outer shell to rotate through the corresponding gear transmission mechanisms, so that the pick teeth on the outer shell cut and crush the rock, and adjusts the speed and torque of the hydraulic motor according to the speed of crushing the rock, controls the speed and torque of the outer shell, concentrates the system power, and improves the efficiency of cutting and cutting teeth; Step 2: The tunnel boring machine breaks the rock on the cross section. First, it cuts the grooves on the rock surface and then moves the cutting head along the rock surface. During the cutting operation, the hydraulic power will be allocated according to the cutting depth Ht: If 0 <ht<h1,掏槽入齿深度ht小于前段外壳上截齿最大工作深度h1时，则控制液压动力系统仅为第三液压马达501供油，按照step1要求调整；If H1 <ht<h2，掏槽入齿深度ht大于前段外壳上截齿最大工作深度h1，但小于中段外壳上截齿最大工作深度h2时，则控制液压动力系统仅为第三液压马达501和第二液压马达401供油，按照step1要求调整；If H2 <ht<h3，掏槽入齿深度ht大于中段外壳上截齿最大工作深度h2，但小于后段外壳上截齿最大工作深度h3时，则控制液压动力系统为所有液压马达供油，并按照step1要求调整；Among them, the cutting depth Ht is the distance from the rock surface after crushing to the rock surface of the cross section; the maximum working depth H1 of the upper pick of the front shell is the maximum vertical distance from the head of the upper pick of the front shell to the end face of the front shell; the maximum working depth H2 of the upper pick of the middle shell is the maximum vertical distance from the head of the upper pick of the front shell to the distal end face of the middle shell; the maximum working depth H3 of the upper pick of the rear shell is the maximum vertical distance from the head of the upper pick of the front shell to the distal end face of the rear shell; Step 3: After the slotting operation is completed, the slot surface needs to be transversely crushed. The roadheader moves the cutting head horizontally or vertically along the rock surface, and compares the thickness Hp of the crushed section with the maximum working depth H1 of the cutting teeth on the front shell, the maximum working depth H2 of the cutting teeth on the middle shell, and the maximum working depth H3 of the cutting teeth on the rear shell; If 0 <hp<h1, 破碎断面的厚度小于前段截割头机构的最大工作深度，则控制液压动力系统仅为第三液压马达501供油，按照step1要求调整；If H1 <hp<h2，破碎断面的厚度大于前段截割头机构的最大工作深度，但小于中段截割头机构的最大工作深度，则控制液压动力系统仅为第三液压马达501和第二液压马达401供油，按照step1要求调整；If H2 <hp<h3，破碎断面的厚度大于中段截割头机构的最大工作深度，但小于后段截割头机构的最大工作深度，则控制液压动力系统为所有液压马达供油工作，并按照step1要求调整；Among them, the thickness of the broken section Hp is the vertical distance from the point on the slot surface formed after the slotting to the rock of the section; Step 4: After completing the rock crushing work, repeat the above Step 1 to Step 3 to carry out the next excavation operation.

Claims

1. A power distributable cantilever roadheader cutting head, comprising a mounting frame mounted on a cantilever of the cantilever roadheader, a housing rotatably mounted on the outer side of the mounting frame, a plurality of helically distributed cutting teeth (602) mounted on the outer side of the housing via a cutting tooth seat (601), characterized in that: The housing comprises a rear section housing (309) rotatably mounted on the rear section of the mounting frame, a middle section housing (410) rotatably mounted on the middle section of the mounting frame, and a front section housing (511) rotatably mounted on the front section of the mounting frame; The rear section housing (309) is connected to the first hydraulic motor (301) via a first gear transmission mechanism; The middle section housing (410) is connected to the second hydraulic motor (401) via a second gear transmission mechanism; The front section housing (511) is connected to the third hydraulic motor (501) via a third gear transmission structure; The first hydraulic motor (301), the second hydraulic motor (401) and the third hydraulic motor (501) are respectively connected to the hydraulic system (101) via hydraulic pipelines (102).

2. The power-distributable cantilever-type roadheader cutting head according to claim 1, characterized in that: The first gear transmission mechanism comprises a first planet carrier (303), a first sun gear (308), and a first planet gear (306); The mounting frame comprises a rear section mounting frame (201) connected to the cantilever of the cantilever type tunnel boring machine, the first planetary carrier (303) is mounted on the top of the rear section mounting frame (201), the first sun gear (308) mounted on the first planetary carrier (303) is connected to the output shaft of the first hydraulic motor (301) mounted on the first planetary carrier (303), the first slewing support bearing is mounted on the top of the rear section mounting frame (201), the inner side of the support inner ring (305) of the first slewing support bearing is provided with a first gear portion meshing with the first planetary gear (306), the first planetary gear (306) is meshed with the first sun gear (308), and the support inner ring (305) of the first slewing support bearing is connected to the rear section housing (309).

3. The power-distributable cantilever-type roadheader cutting head according to claim 2, characterized in that: The second gear transmission mechanism comprises a second planet carrier (406), a second sun gear (409), and a second planet gear (407); The mounting frame comprises a middle section mounting frame (403) mounted on the top of the first planetary frame (303); the second planetary frame (406) is mounted on the top of the middle section mounting frame (403); the second sun gear (409) mounted on the second planetary frame (406) is connected to the output shaft of the second hydraulic motor (401) mounted on the second planetary frame (406); a second slewing support bearing is mounted on the top of the middle section mounting frame (403); a second gear portion meshing with the second planetary gear (407) is provided on the inner side of the supporting inner ring (404) of the second slewing support bearing; the second planetary gear (407) is meshed with the second sun gear (409); and the supporting inner ring (404) of the second slewing support bearing is connected to the middle section housing (410).

4. The power-distributable cantilever-type cutting head for a roadheader according to claim 3, characterized in that: The third gear transmission mechanism comprises a third planet carrier (504), a third sun gear (506), and a third planetary gear (505); The mounting bracket includes a front mounting bracket (502) mounted on the top of the second planet carrier (406). The third planet carrier (504) is mounted on the top of the front mounting bracket (502). The third sun gear (506) mounted on the third planet carrier (504) is connected to the output shaft of the third hydraulic motor (501) mounted on the third planet carrier (504). A third slewing bearing is mounted on the top of the front mounting bracket (502). A third gear portion meshing with the third planet gear (505) is provided on the inner side of the support inner ring (508) of the third slewing bearing. The third planet gear (505) meshes with the third sun gear (506). The support inner ring (508) of the third slewing bearing is connected to the middle front housing (511).

5. The power-distributable cantilever-type roadheader cutting head according to claim 4, characterized in that: A first shock pad (302) is provided between the first hydraulic motor (301) and the first planet carrier (303). A second shock pad (402) is provided between the second hydraulic motor (401) and the second planet carrier (406). A third shock pad (503) is provided between the third hydraulic motor (501) and the third planet carrier (504).

6. The power distribution method for a cantilever type roadheader cutting head capable of distributing power according to any one of claims 1 to 5, characterized in that It includes the following steps: Step1: When the roadheader is working, the hydraulic power system controls the first hydraulic motor (301), the second hydraulic motor (401), and the third hydraulic motor (501) respectively, and then drives the housing to rotate through the respective corresponding gear transmission mechanisms, so that the picks on the housing cut and break the rock. According to the speed of breaking the rock, the speed and torque of the hydraulic motor are adjusted to control the rotation speed and torque on the housing, concentrate the system power, and improve the pick efficiency of the cut. Step2: When the roadheader breaks the rock of the cross-section, first complete the pick of the rock face, and then move the cutting head along the direction of the rock face. During the pick operation of the rock face, the hydraulic power will be distributed according to the pick depth Ht of the rock face: If 0 < Ht < H1, that is, when the pick depth Ht of the rock face is less than the maximum working depth H1 of the picks on the front housing, the hydraulic power system is controlled to supply oil only to the third hydraulic motor (501) and adjusted according to the requirements of Step1; If H1 < Ht < H2, that is, when the pick depth Ht of the rock face is greater than the maximum working depth H1 of the picks on the front housing but less than the maximum working depth H2 of the picks on the middle housing, the hydraulic power system is controlled to supply oil only to the third hydraulic motor (501) and the second hydraulic motor (401) and adjusted according to the requirements of Step1; If H2 < Ht < H3, that is, when the pick depth Ht of the rock face is greater than the maximum working depth H2 of the picks on the middle housing but less than the maximum working depth H3 of the picks on the rear housing, the hydraulic power system is controlled to supply oil to all hydraulic motors and adjusted according to the requirements of Step1; Among them, the slotting tooth penetration depth Ht is the distance from the broken rock surface to the cross-section rock surface; the maximum working depth H1 of the pick on the front section housing is the maximum vertical distance from the tip of the pick on the front section housing to the end face of the front section housing; the maximum working depth H2 of the pick on the middle section housing is the maximum vertical distance from the tip of the pick on the front section housing to the far end face of the middle section housing; the maximum working depth H3 of the pick on the rear section housing is the maximum vertical distance from the tip of the pick on the front section housing to the far end face of the rear section housing; Step3: After completing the slotting operation, it is necessary to perform a transverse crushing operation on the slot surface. The roadheader horizontally or vertically moves the cutting head along the rock surface direction, and compares the thickness Hp of the crushing cross-section with the maximum working depth H1 of the pick on the front section housing, the maximum working depth H2 of the pick on the middle section housing, and the maximum working depth H3 of the pick on the rear section housing; If 0 < Hp < H1, that is, the thickness of the crushing cross-section is less than the maximum working depth of the front cutting head mechanism, then control the hydraulic power system to supply oil only to the third hydraulic motor (501) and adjust according to the requirements of Step1; If H1 < Hp < H2, that is, the thickness of the crushing cross-section is greater than the maximum working depth of the front cutting head mechanism but less than the maximum working depth of the middle cutting head mechanism, then control the hydraulic power system to supply oil only to the third hydraulic motor (501) and the second hydraulic motor (401) and adjust according to the requirements of Step1; If H2 < Hp < H3, that is, the thickness of the crushing cross-section is greater than the maximum working depth of the middle cutting head mechanism but less than the maximum working depth of the rear cutting head mechanism, then control the hydraulic power system to supply oil to all hydraulic motors for operation and adjust according to the requirements of Step1; Among them, the thickness Hp of the crushing cross-section is the vertical distance from the point on the slot hole surface formed after slotting to the cross-section rock; Step4: After completing the work of crushing the cross-section rock once, repeat the above Steps 1 to 3 for the next tunneling operation.

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