A power-distributable cantilever-type cutting head for a roadheader

Abstract

The present invention provides a power-distributable cantilevered roadheader cutting head, comprising a mounting frame mounted on the cantilever of a cantilevered roadheader, a housing rotatably mounted on the outside of the mounting frame, a plurality of spirally distributed cutting teeth mounted on the outside of the housing via a cutting tooth holder, the housing comprising a rear section housing rotatably mounted on the rear section of the mounting frame, a middle section housing rotatably mounted on the middle section of the mounting frame, and a front section housing rotatably mounted on the front section of the mounting frame; the rear section housing is connected to a first hydraulic motor via a first gear transmission mechanism; the middle section housing is connected to a second hydraulic motor via a second gear transmission mechanism; and the front section housing is connected to a third hydraulic motor via a third gear transmission mechanism. By adjusting the circuit flow of the hydraulic motor corresponding to each section housing to control and adjust the output torque, different torques are distributed to each section housing in real time, thereby achieving power-distributable roadheader cutting head excavation operations, thereby resolving the problem of power waste of the cutting head during the tooth insertion phase and improving roadheading efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of cantilever roadheaders, in particular to a power-distributable cantilever roadheader cutting head. Background Art

[0002] A roadheader (TBM) is a combined machine capable of simultaneously cutting, loading, and transporting rock. Based on the cutting method used to cut the working face, TBMs can be divided into full-face and partial-face TBMs. With the advancement of automation, intelligence, and information technology in TBMs, demands for TBM performance are becoming increasingly stringent. The cutting head is the primary operating component of a TBM. Traditionally, the cutting head is a one-piece structure consisting of a cutting head body, spiral blades, and a pick holder. The pick holder and spiral blades are welded to the head body, and the picks are mounted in the holder. During operation, the cutting head is longitudinally propelled by a telescopic boom propulsion cylinder to cut the groove and insert the cutters. The lifting and slewing mechanisms then drive the cutting head to swing vertically and horizontally to cut the working face. During longitudinal cutting, the front end of the rotating cutting head cuts the rock wall, while the rear end idles outside the working face and does not participate in cutting. This requires a high power output to insert the cutters, but the idle operation of the rear end dissipates this power, resulting in wasted power. After inserting the cutters, during lateral cutting, the front end of the cutting head also cuts while the rear end idles, resulting in power 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 present invention aims to provide a cantilevered roadheader cutting head with distributable power. By designing the outer shell of the mounting frame into a multi-segment structure, with each segment driven by a hydraulic motor and gear transmission mechanism, and adjusting the output torque through flow control, different torques are distributed to each segment in real time, enabling the roadheader cutting head to distribute power during tunneling operations, thereby solving the problem of cutting head power waste during the tooth entry phase and improving tunneling efficiency. To achieve the above-mentioned technical features, the present invention achieves the following objectives:

[0004] A power-distributable cantilever roadheader cutting head, comprising a mounting frame mounted on the cantilever of the cantilever roadheader, a housing rotatably mounted on the outside of the mounting frame, a plurality of helically distributed cutting teeth mounted on the outside of the housing via a cutting tooth holder, the housing comprising a rear section housing rotatably mounted on the rear section of the mounting frame, a middle section housing rotatably mounted on the middle section of the mounting frame, and a front section housing rotatably mounted on the front section of the mounting frame;

[0005] The rear housing is connected to the first hydraulic motor via a first gear transmission mechanism;

[0006] The middle section housing is connected to the second hydraulic motor via a second gear transmission mechanism;

[0007] The front section housing is connected to the third hydraulic motor via a third gear transmission mechanism;

[0008] The first hydraulic motor, the second hydraulic motor and the third hydraulic motor are respectively connected to the hydraulic system through hydraulic pipelines.

[0009] The first gear transmission mechanism includes a first planet carrier, a first sun gear, and a first planet gear;

[0010] The mounting frame includes a rear-section mounting frame connected to the cantilever of the cantilever tunneling machine, the first planetary carrier is mounted on the top of the rear-section mounting frame, the first sun gear mounted on the first planetary carrier is connected to the output shaft of the first hydraulic motor mounted on the first planetary carrier, the first slewing support bearing is mounted 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 portion 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.

[0011] The second gear transmission mechanism includes a second planet carrier, a second sun gear, and second planet gears;

[0012] The mounting frame includes a middle mounting frame mounted on the top of the first planetary carrier, the second planetary carrier is mounted on the top of the middle mounting frame, the second sun gear mounted on the second planetary carrier is connected to the output shaft of the second hydraulic motor mounted on the second planetary carrier, a second slewing support bearing is mounted on the top of the middle mounting frame, the inner side of the support inner ring of the second slewing support bearing is provided with a second gear portion meshing with the second planetary gear, the second planetary gear is meshed with the second sun gear, and the support inner ring of the second slewing support bearing is connected to the middle housing.

[0013] The third gear transmission mechanism includes a third planet carrier, a third sun gear, and third planet gears;

[0014] The mounting frame includes a front-section mounting frame mounted on the top of the second planetary carrier, the third planetary carrier is mounted on the top of the front-section mounting frame, the third sun gear mounted on the third planetary carrier is connected to the output shaft of the third hydraulic motor mounted on the third planetary carrier, and a third slewing support bearing is mounted 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 portion 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.

[0015] A first shock pad is provided between the first hydraulic motor and the first planet carrier, a second shock pad is provided between the second hydraulic motor and the second planet carrier, and a third shock pad is provided between the third hydraulic motor and the third planet carrier.

[0016] A power distribution method for the cutting head of a power-distributable cantilever roadheader includes the following steps:

[0017] 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 outer shell to rotate through their respective corresponding gear transmission mechanisms, so that the cutting teeth on the outer shell 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 speed and torque on the outer shell, concentrate the system power, and improve the tooth-entering efficiency of the cut.

[0018] Step2: When the roadheader breaks the section rock, first complete the tooth-entering of the rock face cutting, and then move the cutting head along the rock face direction. During the tooth-entering operation of the cut, the hydraulic power will be distributed according to the tooth-entering depth Ht of the cut:

[0019] If 0 < Ht < H1, that is, when the tooth-entering depth Ht of the cut is less than the maximum working depth H1 of the cutting teeth on the front-section outer shell, control the hydraulic power system to supply oil only to the third hydraulic motor and adjust according to the requirements of Step1;

[0020] If H1 < Ht < H2, that is, when the tooth-entering depth Ht of the cut is greater than the maximum working depth H1 of the cutting teeth on the front-section outer shell but less than the maximum working depth H2 of the cutting teeth on the middle-section outer shell, 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;

[0021] If H2 < Ht < H3, that is, when the tooth-entering depth Ht of the cut is greater than the maximum working depth H2 of the cutting teeth on the middle-section outer shell but less than the maximum working depth H3 of the cutting teeth on the rear-section outer shell, control the hydraulic power system to supply oil to all hydraulic motors and adjust according to the requirements of Step1;

[0022] Among them, the tooth-entering depth Ht of the cut is the distance from the broken rock face to the section rock face; the maximum working depth H1 of the cutting teeth on the front-section outer shell is the maximum vertical distance from the head of the cutting teeth on the front-section outer shell to the end face of the front-section outer shell; the maximum working depth H2 of the cutting teeth on the middle-section outer shell is the maximum vertical distance from the head of the cutting teeth on the front-section outer shell to the far end face of the middle-section outer shell; the maximum working depth H3 of the cutting teeth on the rear-section outer shell is the maximum vertical distance from the head of the cutting teeth on the front-section outer shell to the far end face of the rear-section outer shell;

[0023] Step 3: After completing the cut - ting operation, it is necessary to perform a transverse crushing operation on the cut surface. The roadheader moves the cutting head horizontally or vertically along the rock surface direction, and compares the thickness Hp of the crushing section with the maximum working depth H1 of the cutting teeth on the front - section outer shell, the maximum working depth H2 of the cutting teeth on the middle - section outer shell, and the maximum working depth H3 of the cutting teeth on the rear - section outer shell;

[0024] If 0 < Hp < H1, that is, the thickness of the crushing section is less than the maximum working depth of the front - section cutting - head mechanism, then control the hydraulic power system to supply oil only to the third hydraulic motor and adjust according to the requirements of Step 1;

[0025] If H1 < Hp < H2, that is, the thickness of the crushing section is greater than the maximum working depth of the front - section cutting - head mechanism but less than the maximum working depth of the middle - section cutting - head mechanism, then control the hydraulic power system to supply oil to only the third hydraulic motor and the second hydraulic motor and adjust according to the requirements of Step 1;

[0026] If H2 < Hp < H3, that is, the thickness of the crushing section is greater than the maximum working depth of the middle - section cutting - head mechanism but less than the maximum working depth of the rear - section cutting - head mechanism, then control the hydraulic power system to supply oil to all hydraulic motors for work and adjust according to the requirements of Step 1;

[0027] Among them, the thickness Hp of the crushing section is the vertical distance from the point on the cut - hole surface formed after cutting to the section rock;

[0028] Step 4: After completing the work of crushing the section rock once, repeat the above Steps 1 - 3 for the next tunneling operation.

[0029] 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 cutting teeth distributed in a spiral shape are installed on the outside of the housing through cutting - tooth seats. The housing includes a rear - section outer shell rotatably installed on the rear section of the mounting frame, a middle - section outer shell rotatably installed on the middle section of the mounting frame, and a front - section outer shell rotatably installed on the front section of the mounting frame. The rear - section outer shell is connected to the first hydraulic motor through a first gear - transmission mechanism. The middle - section outer shell is connected to the second hydraulic motor through a second gear - transmission mechanism. The front - section outer shell is connected to the third hydraulic motor through a third gear - transmission mechanism. The first hydraulic motor, the second hydraulic motor, and the third hydraulic motor are respectively connected to the hydraulic system through hydraulic pipelines. The present invention designs the housing outside the mounting frame 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 loop flow of the hydraulic motors corresponding to each section of the housing, the output torque is controlled and adjusted, and different torques are allocated to each segmented outer shell in real - time, realizing the power - distributable tunneling operation of the roadheader cutting head, thus solving the problem of power waste of the cutting head in the tooth - entering stage and improving the tunneling efficiency. Description of the Drawings

[0030] The present invention will be further described below with reference to the accompanying drawings and examples.

[0031] Figure 1 An overall diagram of a power-distributable cantilever-type roadheader cutting head provided in an embodiment of the present invention;

[0032] Figure 2 An external view of a power-distributable cantilever-type roadheader cutting head provided in an embodiment of the present invention;

[0033] Figure 3 A cross-sectional view of a power-distributable cantilever-type roadheader cutting head provided in an embodiment of the present invention;

[0034] Figure 4 An exploded front view of the front section structure of a cutting head of a cantilever roadheader with distributable power provided by an embodiment of the present invention;

[0035] Figure 5 An exploded isometric diagram of the front section structure of a cutting head of a cantilever roadheader with distributable power provided by an embodiment of the present invention;

[0036] Figure 6 This is an exploded front view of a mid-section structure of a cutting head of a cantilever roadheader with distributable power provided by an embodiment of the present invention;

[0037] Figure 7 This is an exploded isometric diagram of the mid-section structure of a cutting head of a cantilever roadheader with distributable power provided by an embodiment of the present invention;

[0038] Figure 8 This is an exploded front view of a rear section structure of a cutting head of a cantilever roadheader with distributable power provided by an embodiment of the present invention;

[0039] Figure 9 This is an exploded isometric diagram of the rear section structure of a cutting head of a cantilever roadheader with distributable power provided by an embodiment of the present invention;

[0040] 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 Housing 410, first pin 411, second pin 412, fifth bolt 413, sixth bolt 414, seventh bolt 415, eighth bolt 416, ninth bolt 417, second bearing 418, third hydraulic motor 501, front mounting frame 502, third shock-absorbing pad 503, third planetary carrier 504, third planetary gear 505, third sun gear 506, third slewing support outer ring 507, third slewing support inner ring 508, baffle 509, planetary carrier baffle 510, front 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 holder 601, pick 602, spiral baffle 603;

[0041] 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;

[0042] 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;

[0043] The maximum working depth H3 of the pick on the rear section shell is the maximum vertical distance from the head of the pick on the front section shell to the distal end surface of the rear section shell. DETAILED DESCRIPTION

[0044] The embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0045] See attached Figure 1-9, a distributable power cantilever tunneling machine cutting head, including a mounting frame installed on the cantilever of the cantilever tunneling machine, a shell being rotatably mounted on the outside of the mounting frame, and a plurality of spirally distributed cutting teeth 602 being mounted on the outside of the shell through a cutting tooth seat 601, the shell including a rear section shell 309 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 511 rotatably mounted 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 mechanism; 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 into a multi-section structure, and each section of the shell is driven by its own corresponding hydraulic motor and gear transmission mechanism. By adjusting the circuit flow of the hydraulic motor corresponding to each section of the shell to control and adjust the output torque, different torques are distributed to each segmented shell in real time, so that the power of the tunnel boring machine cutting head can be distributed 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.

[0046] 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, 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 306, the first planetary gear 306 is meshed with the first sun gear 308, and the support 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, the power is transmitted to the support 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.

[0047] 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 which meshes with the second planetary gear 407. The second planetary gear 407 meshes with the second sun gear 409. 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 meshed with it rotates, and the second slewing support inner ring 404 which meshes 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.

[0048] 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 portion 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-front section housing 511. When the third hydraulic motor 501 drives the third sun gear 506 to rotate, the third planetary gear 505 meshing with it 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, and the rotation direction is opposite to the rotation direction of the third hydraulic motor 501.

[0049] 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 .

[0050] Further, 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.

[0051] A power distribution method for the cutting head of a power-distributable cantilever roadheader, comprising the following steps:

[0052] 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 outer shell to rotate through the respective corresponding gear transmission mechanisms, so that the picks on the outer shell 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 speed and torque on the outer shell, concentrate the system power, and improve the pick efficiency of the cuttings;

[0053] Step2: When the roadheader breaks the cross-section rock, first complete the cuttings into the rock face of the cuttings, and then move the cutting head along the direction of the rock face. During the operation of cutting into the rock face, the hydraulic power will be distributed according to the depth Ht of cutting into the rock face of the cuttings:

[0054] If 0 < Ht < H1, when the depth Ht of cutting into the rock face of the cuttings is less than the maximum working depth H1 of the picks on the front-section outer shell, then control the hydraulic power system to supply oil only to the third hydraulic motor 501 and adjust according to the requirements of Step1;

[0055] If H1 < Ht < H2, when the depth Ht of cutting into the rock face of the cuttings is greater than the maximum working depth H1 of the picks on the front-section outer shell but less than the maximum working depth H2 of the picks on the middle-section outer shell, 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;

[0056] If H2 < Ht < H3, when the depth Ht of cutting into the rock face of the cuttings is greater than the maximum working depth H2 of the picks on the middle-section outer shell but less than the maximum working depth H3 of the picks on the rear-section outer shell, then control the hydraulic power system to supply oil to all hydraulic motors and adjust according to the requirements of Step1;

[0057] Wherein, the depth Ht of cutting into the rock face of the cuttings is the distance from the broken rock face to the cross-section rock face; the maximum working depth H1 of the picks on the front-section outer shell is the maximum vertical distance from the head of the picks on the front-section outer shell to the end face of the front-section outer shell; the maximum working depth H2 of the picks on the middle-section outer shell is the maximum vertical distance from the head of the picks on the front-section outer shell to the far end face of the middle-section outer shell; the maximum working depth H3 of the picks on the rear-section outer shell is the maximum vertical distance from the head of the picks on the front-section outer shell to the far end face of the rear-section outer shell;

[0058] Step 3: After the cut is completed, a transverse rock breaking operation needs to be carried out on the cut surface. The roadheader moves the cutting head horizontally or vertically along the rock surface, and compares the thickness Hp of the broken section with the maximum working depth H1 of the cutting teeth on the front section of the outer shell, the maximum working depth H2 of the cutting teeth on the middle section of the outer shell, and the maximum working depth H3 of the cutting teeth on the rear section of the outer shell;

[0059] If 0 < Hp < H1, that is, the thickness of the broken section is less than the maximum working depth of the cutting head mechanism in the front section, then control the hydraulic power system to supply oil only to the third hydraulic motor 501 and adjust according to the requirements of Step 1;

[0060] If H1 < Hp < H2, that is, the thickness of the broken section is greater than the maximum working depth of the cutting head mechanism in the front section but less than the maximum working depth of the cutting head mechanism in the middle section, 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 Step 1;

[0061] If H2 < Hp < H3, that is, the thickness of the broken section is greater than the maximum working depth of the cutting head mechanism in the middle section but less than the maximum working depth of the cutting head mechanism in the rear section, then control the hydraulic power system to supply oil to all hydraulic motors for operation and adjust according to the requirements of Step 1;

[0062] Among them, the thickness Hp of the broken section is the vertical distance from the point on the cut surface formed after cutting to the rock of the section;

[0063] Step 4: After completing the rock breaking work of one broken section, repeat the above Steps 1 to Step 3 for the next tunneling operation.

Claims

1. A power distributable cantilever roadheader cutting head, comprising a mounting frame mounted on the 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 mechanism; 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); The first gear transmission mechanism comprises a first planetary carrier (303) and a first sun gear (308); the mounting frame comprises a rear mounting frame (201) connected to the boom of the cantilever type roadheader; the first planetary carrier (303) is mounted on the top of the rear 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 second gear transmission mechanism includes a second planetary carrier (406) and a second sun gear (409); 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 third gear transmission mechanism includes a third planetary carrier (504) and a third sun gear (506); the mounting frame includes a front 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 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).

2. The power-distributable cantilever roadheader cutting head according to claim 1, characterized in that: The first gear transmission mechanism includes a first planetary gear (306), a first slewing support bearing is installed on the top of the rear section mounting frame (201), a first gear portion meshing with the first planetary gear (306) is provided on the inner side of the supporting inner ring (305) of the first slewing support bearing, the first planetary gear (306) is meshed with the first sun gear (308), and the supporting inner ring (305) of the first slewing support bearing is connected to the rear section housing (309).

3. The power-distributable cantilever roadheader cutting head according to claim 2, characterized in that: The second gear transmission mechanism includes a second planetary gear (407). A second slewing bearing is mounted on the top of the middle section mounting frame (403). On the inner side of the support inner ring (404) of the second slewing bearing, there is a second gear portion meshing with the second planetary gear (407). The second planetary gear (407) meshes with the second sun gear (409). The support inner ring (404) of the second slewing bearing is connected to the middle section housing (410).

4. The power-distributable cantilever-type roadheader cutting head according to claim 3, characterized in that: The third gear transmission mechanism includes a third planetary gear (505). A third slewing bearing is mounted on the top of the front section mounting frame (502). On the inner side of the support inner ring (508) of the third slewing bearing, there is a third gear portion meshing with the third planetary gear (505). The third planetary gear (505) meshes with the third sun gear (506). The support inner ring (508) of the third slewing bearing is connected to the front section housing (511).

5. The power-distributable cantilever-type cutting head for a roadheader 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 cutting head of a cantilevered roadheader 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 works, 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 their 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 speed and torque on the housing, concentrate the system power, and improve the efficiency of slotting into the teeth. Step2: When the roadheader breaks the section rock, first complete the rock face slotting into the teeth, and then move the cutting head along the rock face direction. When slotting into the teeth, the hydraulic power will be distributed according to the slotting depth Ht: If 0 < Ht < H1, that is, when the slotting 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 (501) and adjust according to the requirements of Step1. If H1 < Ht < H2, that is, when the slotting 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 (501) and the second hydraulic motor (401) and adjust according to the requirements of Step1. If H2 < Ht < H3, that is, when the slotting 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 cutting depth Ht of the cut groove is the distance from the rock surface after crushing 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 head 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 head 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 head of the pick on the front section housing to the far end face of the rear section housing; Step3: After completing the cut groove operation, it is necessary to perform a transverse crushing operation on the groove surface. The roadheader moves the cutting head horizontally or vertically 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 groove surface formed after cutting the groove to the cross-section rock; Step4: After completing the work of crushing the cross-section rock once, repeat the above Steps 1 to Step3 to perform the next tunneling operation.

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