CN113482649A - Cutting head for heading machine and heading machine - Google Patents

Cutting head for heading machine and heading machine Download PDF

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Publication number
CN113482649A
CN113482649A CN202110190632.9A CN202110190632A CN113482649A CN 113482649 A CN113482649 A CN 113482649A CN 202110190632 A CN202110190632 A CN 202110190632A CN 113482649 A CN113482649 A CN 113482649A
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CN
China
Prior art keywords
pipe
limiting
heading machine
inner cavity
cutting head
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN202110190632.9A
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Chinese (zh)
Inventor
孙嘉聆
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hangzhou Zhengsheng Safety Technology Co ltd
Original Assignee
Hangzhou Zhengsheng Safety Technology Co ltd
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Publication date
Application filed by Hangzhou Zhengsheng Safety Technology Co ltd filed Critical Hangzhou Zhengsheng Safety Technology Co ltd
Priority to CN202110190632.9A priority Critical patent/CN113482649A/en
Publication of CN113482649A publication Critical patent/CN113482649A/en
Withdrawn legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/10Making by using boring or cutting machines
    • E21D9/1006Making by using boring or cutting machines with rotary cutting tools
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16FSPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • F16F15/06Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs
    • F16F15/067Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with metal springs using only wound springs

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)

Abstract

The invention discloses a cutting head for a heading machine and the heading machine, which comprises a cutting head body, wherein a plurality of cutting edges are fixedly arranged on the surface of the cutting head body, a limiting pipe is arranged on one side of the cutting head body, limiting plates are fixedly arranged on the upper end, the lower end, the front end and the rear end of one side of the cutting head body, one side of each limiting plate penetrates through the limiting pipe and extends to the inner cavity of the limiting pipe, a supporting plate is fixedly arranged on the outer side of the limiting plate in the inner cavity of the limiting pipe, a supporting plate is fixedly arranged on the inner side of the limiting plate in the inner cavity of the limiting pipe, when the cutting edges are worn greatly and need to be replaced, a motor is started, an output shaft of the motor drives a first gear to rotate, the first gear drives a second gear to rotate, the second gear drives a threaded rod to rotate, the threaded rod drives a movable rod to move, and when the movable rod is out of clamping state with the limiting plates, the motor is turned off to stop moving, the cutting head is taken out, and a new cutting head is replaced, so that the replacement efficiency is improved.

Description

Cutting head for heading machine and heading machine
Technical Field
The invention belongs to the technical field of development machines, and particularly relates to a cutting head for a development machine and the development machine.
Background
The heading machine is a machine for cutting a roadway on a flat ground, and has multiple types: dividing the machine into a common machine and a tunnel boring machine according to an operation object; the method is divided into an open-type heading machine and a shield-type heading machine according to the operation mode, and the operation mode is as follows: the rock breaking machine mainly comprises a travelling mechanism, a working mechanism, a loading and transporting mechanism and a transshipping mechanism, wherein the travelling mechanism is pushed forward, a cutting head in the working mechanism continuously breaks rocks and transports the broken rocks away, and the rock breaking machine has the advantages of safety, high efficiency, good roadway forming quality and the like, but is high in manufacturing cost, complex in structure and large in loss.
And current colliery entry driving machine, the cutterhead is not convenient for dismantle, when the great needs of change of cutting edge wearing and tearing on cutterhead surface, because the cutting edge quantity on cutterhead surface is more, can only carry out a dismantlement and change, wastes time and energy, and the cutterhead lacks shock-absorbing function simultaneously, when mining coal, if meet the great rock of hardness, damages the cutting edge easily, for this, provides cutting head and entry driving machine for entry driving machine.
Disclosure of Invention
The invention aims to provide a cutting head for a heading machine and the heading machine, and aims to solve the problems that the cutting head is inconvenient to disassemble and the vibration absorption of the cutting head is lacked in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
cutterhead and entry driving machine for entry driving machine, including the cutterhead body, the fixed surface of cutterhead body installs a plurality of cutting edges, one side of cutterhead body is provided with spacing pipe, the equal fixed mounting in upper and lower both ends and front and back both ends of cutterhead body one side has the limiting plate, one side of limiting plate runs through spacing pipe and extends to the inner chamber of spacing pipe, the outer fixed mounting that the inner chamber of spacing pipe just is located the limiting plate has the backup pad, the inboard fixed mounting that the inner chamber of spacing pipe just is located the limiting plate has the extension board, one side fixed mounting in spacing pipe inner chamber has the motor, the output shaft fixed mounting of motor has first gear, the equal fixed mounting in the opposite side in spacing pipe inner chamber just is located the corresponding department of extension board has the sleeve pipe, sheathed tube inner chamber sliding connection has the carriage release lever, the sheathed tube one end of keeping away from of carriage release lever runs through extension board, extension board in proper order, The limiting plate and the supporting plate extend to the inner cavity of the supporting plate, the inner cavity of the moving rod is connected with a threaded rod in a sliding mode, the inner side of the threaded rod penetrates through the moving rod and the sleeve in sequence and extends to the outer portion of the sleeve to be fixedly provided with a second gear, and the surface of the second gear is meshed with the first gear;
one side of spacing pipe is provided with the commentaries on classics pipe, one side fixed mounting of spacing pipe has the pivot, one side of pivot runs through the commentaries on classics pipe and extends to the inner chamber of commentaries on classics pipe, one side fixed mounting of commentaries on classics pipe inner chamber has the pipe box, the inner chamber sliding connection of pipe box has the telescopic link, one side of telescopic link runs through the pipe box and extends to the outside of pipe box and one side fixed mounting of pivot, one side fixed mounting of pipe box inner chamber has damping spring, one side of damping spring and one side fixed mounting of telescopic link, one side of commentaries on classics pipe is provided with fixed pipe, one side of commentaries on classics pipe and the inner chamber fixed mounting who is located fixed pipe have the bull stick.
Preferably, the both sides of carriage release lever just are located sheathed tube inner chamber fixed mounting and have the stopper, the sheathed tube inner chamber just is located the department that corresponds of stopper and has seted up the spacing groove, the surface of stopper and the inner chamber sliding connection of spacing groove.
Preferably, the shrinkage pool has all been seted up to the inboard of backup pad, limiting plate and extension board, the carriage release lever is located the inner chamber of shrinkage pool and with the inner wall sliding connection of shrinkage pool.
Preferably, the surface of pivot and the inner chamber equidistance fixed mounting that is located the runner have a slider, the inner chamber of runner has just been located the department that corresponds of slider and has seted up the spout, the surface of slider and the inner chamber sliding connection of spout.
Preferably, the fixed surface of spacing pipe installs the spacing ring, the inner chamber sliding connection of spacing ring has the annular plate, one side of annular plate runs through the spacing ring and extends to the spacing ring outside, the surface of rotating-barrel and the inner wall fixed mounting of annular plate.
Preferably, the number of the sliding blocks is six, and the sliding blocks are arranged in an annular shape.
Preferably, one side of the rotating shaft is provided with a notch, and one side of the telescopic rod and one side of the inner cavity of the notch are fixedly installed.
In order to achieve the purpose, the invention also provides a heading machine which comprises the cutting head body for the heading machine.
The invention has the technical effects and advantages that: compared with the prior art, the cutting head for the heading machine and the heading machine provided by the invention have the following advantages:
1. when the cutting edge is worn and changed greatly, the motor is started, the output shaft of the motor drives the first gear to rotate, the first gear drives the second gear to rotate, the second gear drives the threaded rod to rotate, the threaded rod drives the movable rod to move, when the movable rod is separated from a clamping state with the limiting plate, the motor is closed to stop moving, the cutting head is taken out, a new cutting head is replaced, and the replacing efficiency is improved.
2. When the cutting edge is subjected to coal mining and meets rocks, the cutting edge can generate vibration because the cutting edge cannot be broken at one time; the cutting edge drives the cutterhead body to vibrate, the cutterhead body drives the limiting plate to vibrate, the limiting plate drives the limiting pipe to vibrate, the limiting pipe drives the rotating shaft to vibrate, the rotating shaft drives the telescopic rod to vibrate, the telescopic rod drives the damping spring to vibrate, and the damping spring performs damping buffering on the limiting pipe, so that the probability that the cutting edge is damaged due to rocks can be reduced.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic left-side sectional view of the stopper tube of the present invention;
FIG. 3 is a schematic left-side sectional view of the rotary pipe of the present invention;
FIG. 4 is a schematic left-side sectional view of the retainer ring of the present invention.
In the figure: 1. a cutting head body; 2. a limiting pipe; 3. a limiting plate; 4. a support plate; 5. a support plate; 6. a motor; 7. a first gear; 8. a sleeve; 9. a travel bar; 10. a threaded rod; 11. a second gear; 12. Pipe rotation; 13. a rotating shaft; 14. pipe sleeve; 15. a telescopic rod; 16. a damping spring; 17. a fixed tube; 18. A rotating rod; 19. a limiting block; 20. a slider; 21. a limiting ring; 22. an annular plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a cutting head for a heading machine and a heading machine as shown in figures 1-4, which comprises a cutting head body 1, wherein a plurality of cutting edges are fixedly arranged on the surface of the cutting head body 1, a limiting pipe 2 is arranged on one side of the cutting head body 1, limiting plates 3 are fixedly arranged on the upper end, the lower end, the front end and the rear end of one side of the cutting head body 1, one side of each limiting plate 3 penetrates through the limiting pipe 2 and extends to the inner cavity of the limiting pipe 2, a supporting plate 4 is fixedly arranged in the inner cavity of the limiting pipe 2 and is positioned on the outer side of the limiting plate 3, a supporting plate 5 is fixedly arranged in the inner cavity of the limiting pipe 2 and is positioned on the inner side of the limiting plate 3, a motor 6 is fixedly arranged on one side of the inner cavity of the limiting pipe 2, a first gear 7 is fixedly arranged on an output shaft of the motor 6, sleeves 8 are fixedly arranged on the other side of the inner cavity of the limiting pipe 2 and are positioned on the corresponding positions of the supporting plates 5, and the inner cavity of the sleeves 8 is slidably connected with a moving rod 9, one end of the moving rod 9, which is far away from the sleeve 8, sequentially penetrates through the support plate 5, the limiting plate 3 and the support plate 4 and extends to an inner cavity of the support plate 4, the inner cavity of the moving rod 9 is connected with a threaded rod 10 in a sliding manner, the inner side of the threaded rod 10 sequentially penetrates through the moving rod 9 and the sleeve 8 and extends to the outside of the sleeve 8, a second gear 11 is fixedly installed, the surface of the second gear 11 is meshed with the first gear 7, when the cutting edge is worn greatly and needs to be replaced, the motor 6 is started, the output shaft of the motor 6 drives the first gear 7 to rotate, the first gear 7 drives the second gear 11 to rotate, the second gear 11 drives the threaded rod 10 to rotate, the threaded rod 10 drives the moving rod 9 to move, when the moving rod 9 is separated from the clamping state with the limiting plate 3, the motor 6 is closed to stop moving, the cutting head body 1 is taken out, a new cutting head body 1 is replaced, the replacement efficiency is improved, one side of the limiting pipe 2 is provided with a rotating pipe 12, a rotating shaft 13 is fixedly installed on one side of the limiting pipe 2, one side of the rotating shaft 13 penetrates through the rotating pipe 12 and extends to an inner cavity of the rotating pipe 12, a pipe sleeve 14 is fixedly installed on one side of the inner cavity of the rotating pipe 12, an expansion rod 15 is slidably connected to the inner cavity of the pipe sleeve 14, one side of the expansion rod 15 penetrates through the pipe sleeve 14 and extends to the outside of the pipe sleeve 14 and is fixedly installed on one side of the rotating shaft 13, a damping spring 16 is fixedly installed on one side of the inner cavity of the pipe sleeve 14, one side of the damping spring 16 is fixedly installed on one side of the expansion rod 15, a fixed pipe 17 is arranged on one side of the rotating pipe 12, a rotating rod 18 is fixedly installed on one side of the rotating pipe 12 and in the inner cavity of the fixed pipe 17, and when the cutting head body 1 is subjected to coal mining and meets rocks, the cutting edge cannot be broken once, so that the cutting edge can generate vibration; the cutting edge drives the cutting head body 1 to vibrate, the cutting head body 1 drives the limiting plate 3 to vibrate, the limiting plate 3 drives the limiting pipe 2 to vibrate, the limiting pipe 2 drives the rotating shaft 13 to vibrate, the rotating shaft 13 drives the telescopic rod 15 to vibrate, the telescopic rod 15 drives the damping spring 16 to vibrate, and the damping spring 16 damps and buffers the cutting edge, so that the probability of damage of the cutting edge due to rocks can be reduced.
Stoppers 19 are fixedly arranged on two sides of the moving rod 9 and positioned in the inner cavity of the sleeve 8, a limiting groove is arranged in the inner cavity of the sleeve 8 and positioned at a corresponding position of the stopper 19, the surface of the stopper 19 is in sliding connection with the inner cavity of the limiting groove to limit the moving rod 9, the threaded rod 10 is prevented from driving the moving rod 9 to rotate when rotating, so that the normal movement of the moving rod 9 is influenced, concave holes are respectively arranged on the inner sides of the support plate 4, the limit plate 3 and the support plate 5, the moving rod 9 is positioned in the inner cavity of the concave hole and is in sliding connection with the inner wall of the concave hole, so that the moving rod 9 can move conveniently, sliders 20 are fixedly arranged on the surface of the rotating shaft 13 and positioned in the inner cavity of the rotating pipe 12 at equal intervals, sliding grooves are arranged in the inner cavity of the rotating pipe 12 and positioned at corresponding positions of the sliders 20, the surface of the sliders 20 is in sliding connection with the inner cavity of the sliding grooves, so that the rotating shaft 13 can be limited, when the rotating rod 18 drives the rotating pipe 12 to rotate, pivot 13 can follow the rotation, the fixed surface of spacing pipe 2 installs spacing ring 21, the inner chamber sliding connection of spacing ring 21 has annular slab 22, one side of annular slab 22 runs through spacing ring 21 and extends to spacing ring 21 outside, the surface of runner 12 and the inner wall fixed mounting of annular slab 22, can prevent that there is coal fragment to get into between runner 12 and the spacing pipe 2, thereby influence the shock attenuation effect, slider 20's quantity is six and slider 20 is the annular setting, it is more stable when rotating shaft 13 is rotatory to make runner 12 drive, the notch has been seted up to one side of pivot 13, one side of telescopic link 15 and one side fixed mounting of notch inner chamber, save space, be convenient for telescopic link 15 to remove and carry out the shock attenuation to cutterhead body 1.
Based on the cutting head for the heading machine in each embodiment, the invention further provides the heading machine, which comprises the cutting head for the heading machine, and the positive effects of the cutting head for the heading machine in each embodiment are also applicable to the heading machine, and are not described again.
The working principle is as follows: when the cutting edge is worn greatly and needs to be replaced, the motor 6 is started through the external controller, the output shaft of the motor 6 drives the first gear 7 to rotate, the first gear 7 drives the second gear 11 to rotate, the second gear 11 drives the threaded rod 10 to rotate, the threaded rod 10 drives the movable rod 9 to move, when the movable rod 9 is out of a clamping state with the limiting plate 3, the motor 6 is closed to stop moving, the cutting head body 1 is taken out, a new cutting head body 1 is replaced, the replacement efficiency is improved, and when the cutting head body 1 is used for coal mining and meets rocks, the cutting edge cannot be broken once, so that the cutting edge can generate vibration; the cutting edge drives the cutting head body 1 to vibrate, the cutting head body 1 drives the limiting plate 3 to vibrate, the limiting plate 3 drives the limiting pipe 2 to vibrate, the limiting pipe 2 drives the rotating shaft 13 to vibrate, the rotating shaft 13 drives the telescopic rod 15 to vibrate, the telescopic rod 15 drives the damping spring 16 to vibrate, and the damping spring 16 damps and buffers the cutting edge, so that the probability of damage of the cutting edge due to rocks can be reduced.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.

Claims (8)

1. Cutterhead and entry driving machine for entry driving machine, including cutterhead body (1), its characterized in that: the cutting head comprises a cutting head body (1), a limiting pipe (2) is arranged on one side of the cutting head body (1), limiting plates (3) are fixedly mounted at the upper end, the lower end, the front end and the rear end of one side of the cutting head body (1), one side of each limiting plate (3) penetrates through the limiting pipe (2) and extends to the inner cavity of the limiting pipe (2), a supporting plate (4) is fixedly mounted at the outer side of the limiting plate (3) and is positioned in the inner cavity of the limiting pipe (2), a supporting plate (5) is fixedly mounted at the inner side of the limiting plate (3), a motor (6) is fixedly mounted at one side of the inner cavity of the limiting pipe (2), a first gear (7) is fixedly mounted at an output shaft of the motor (6), a sleeve (8) is fixedly mounted at the corresponding position of the supporting plate (5) and is arranged at the other side of the inner cavity of the limiting pipe (2), a moving rod (9) is slidably connected with the inner cavity of the sleeve (8), one end, far away from the sleeve (8), of the moving rod (9) penetrates through the support plate (5), the limiting plate (3) and the support plate (4) in sequence and extends to an inner cavity of the support plate (4), a threaded rod (10) is connected to the inner cavity of the moving rod (9) in a sliding mode, a second gear (11) is fixedly mounted on the outer portion, extending to the sleeve (8), of the inner side of the threaded rod (10) penetrates through the moving rod (9) and the sleeve (8) in sequence, the surface of the second gear (11) is meshed with the first gear (7), and a plurality of cutting edges are fixedly mounted on the surface of the cutting head body (1);
a rotating pipe (12) is arranged at one side of the limiting pipe (2), a rotating shaft (13) is fixedly arranged at one side of the limiting pipe (2), one side of the rotating shaft (13) penetrates through the rotating pipe (12) and extends to the inner cavity of the rotating pipe (12), a pipe sleeve (14) is fixedly arranged on one side of the inner cavity of the rotating pipe (12), an inner cavity of the pipe sleeve (14) is connected with a telescopic rod (15) in a sliding way, one side of the telescopic rod (15) penetrates through the pipe sleeve (14) and extends to the outside of the pipe sleeve (14) to be fixedly installed with one side of the rotating shaft (13), a damping spring (16) is fixedly arranged on one side of the inner cavity of the pipe sleeve (14), one side of the damping spring (16) is fixedly arranged with one side of the telescopic rod (15), one side of rotating pipe (12) is provided with fixed pipe (17), one side of rotating pipe (12) and the inner chamber that is located fixed pipe (17) fixed mounting have bull stick (18).
2. The cutter head for a heading machine and the heading machine according to claim 1, wherein: the inner chamber fixed mounting that just is located sleeve pipe (8) in the both sides of carriage release lever (9) has stopper (19), the inner chamber of sleeve pipe (8) just is located the department that corresponds of stopper (19) and has seted up the spacing groove, the surface of stopper (19) and the inner chamber sliding connection of spacing groove.
3. The cutter head for a heading machine and the heading machine according to claim 1, wherein: the shrinkage pool has all been seted up to the inboard of backup pad (4), limiting plate (3) and extension board (5), carriage release lever (9) are located the inner chamber of shrinkage pool and with the inner wall sliding connection of shrinkage pool.
4. The cutter head for a heading machine and the heading machine according to claim 1, wherein: the surface of pivot (13) and the inner chamber equidistance fixed mounting that is located runner pipe (12) have slider (20), the spout has been seted up to the inner chamber of runner pipe (12) and the department that corresponds that is located slider (20), the surface of slider (20) and the inner chamber sliding connection of spout.
5. The cutter head for a heading machine and the heading machine according to claim 1, wherein: the fixed surface of spacing pipe (2) installs spacing ring (21), the inner chamber sliding connection of spacing ring (21) has annular plate (22), one side of annular plate (22) runs through spacing ring (21) and extends to the outside of spacing ring (21), the surface of commentaries on classics pipe (12) and the inner wall fixed mounting of annular plate (22).
6. The cutter head for a heading machine and the heading machine according to claim 4, wherein: the number of the sliding blocks (20) is six, and the sliding blocks (20) are arranged annularly.
7. The cutter head for a heading machine and the heading machine according to claim 1, wherein: a notch is formed in one side of the rotating shaft (13), and one side of the telescopic rod (15) is fixedly installed with one side of an inner cavity of the notch.
8. A heading machine is characterized in that: comprising a cutting head for a heading machine according to any of claims 1 to 7.
CN202110190632.9A 2021-02-18 2021-02-18 Cutting head for heading machine and heading machine Withdrawn CN113482649A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110190632.9A CN113482649A (en) 2021-02-18 2021-02-18 Cutting head for heading machine and heading machine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110190632.9A CN113482649A (en) 2021-02-18 2021-02-18 Cutting head for heading machine and heading machine

Publications (1)

Publication Number Publication Date
CN113482649A true CN113482649A (en) 2021-10-08

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ID=77933320

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202110190632.9A Withdrawn CN113482649A (en) 2021-02-18 2021-02-18 Cutting head for heading machine and heading machine

Country Status (1)

Country Link
CN (1) CN113482649A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112943280A (en) * 2021-02-05 2021-06-11 胡春花 Tunneling device for coal mining

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112943280A (en) * 2021-02-05 2021-06-11 胡春花 Tunneling device for coal mining

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Application publication date: 20211008