CN115949421A - Cutter head structure for micro shield machine - Google Patents
Cutter head structure for micro shield machine Download PDFInfo
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- CN115949421A CN115949421A CN202310047613.XA CN202310047613A CN115949421A CN 115949421 A CN115949421 A CN 115949421A CN 202310047613 A CN202310047613 A CN 202310047613A CN 115949421 A CN115949421 A CN 115949421A
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- hob
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- cutter head
- limiting
- mounting seat
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Abstract
The invention discloses a cutter head structure for a miniature shield machine, relates to the technical field of miniature shield machines, and solves the problem that the working efficiency of the miniature shield machine is low because the working tracks of hobbing cutters are overlapped when the miniature cutter head rolls because the angle between the hobbing cutters arranged on the cutter head of the miniature shield machine and the cutter head is ninety degrees. The utility model provides a miniature shield constructs machine blade disc structure, includes the shield and constructs the quick-witted blade disc, the center department that the shield constructs the quick-witted blade disc is provided with the bar groove, inlay in the middle of bar groove and be provided with central hobbing cutter assembly. According to the invention, the plurality of hobbing cutters are arranged on the surface of the miniature shield machine, the hobbing cutters are divided into a double-edge hobbing cutter and a single-edge hobbing cutter, the two hobbing cutters are arranged on the cutter head of the miniature shield machine at different inclination angles, and the movement tracks of the hobbing cutters are not overlapped when the cutter head of the miniature shield machine moves, so that the soil layer on the inner wall of the tunnel is better crushed, and the working efficiency of the miniature shield machine is effectively improved.
Description
Technical Field
The invention relates to the technical field of miniature shield tunneling machines, in particular to a cutter head structure for a miniature shield tunneling machine.
Background
The shield machine is a tunnel tunneling machine using a shield method, the shield construction method is that the tunneling machine constructs (lays) a 'shield' (referring to a supporting segment) of a tunnel while tunneling, the shield machine is generally divided into a hand-tunneling type shield, a squeezing type shield, a semi-mechanical type shield (local air pressure and global air pressure) and a mechanical type shield (a chest-opening type cutting shield, an air pressure type shield, a muddy water pressurizing shield, an earth pressure balance shield, a mixed type shield and a special type shield) according to the working principle;
the miniature shield machine is a shield machine with a smaller size than a shield machine with a normal use, and when the miniature shield machine is used for tunneling, a cutter head is arranged at the end of the miniature shield machine to rotate so as to crush a soil layer, and the miniature shield machine moves towards the inside of the soil layer while crushing.
When the miniature shield machine is used for tunneling, a cutter on a cutter disc of the miniature shield machine is used for crushing a soil layer, and an angle between a hob arranged on the cutter disc of the miniature shield machine and the cutter disc is a ninety-degree angle, so that the working tracks of the hobs are mutually overlapped when the miniature cutter disc rolls, and the working efficiency of the miniature shield machine is lower; therefore, the existing requirements are not met, and the cutter head structure for the micro shield tunneling machine is provided for the requirements.
Disclosure of Invention
The invention aims to provide a cutter head structure for a miniature shield machine, which aims to solve the problems that the working tracks of hobs are overlapped when a miniature cutter head rolls because the angle between the hob and the cutter head arranged on the miniature shield machine cutter head provided in the background technology is ninety degrees, the working efficiency of the miniature shield machine is low and the like.
In order to achieve the purpose, the invention provides the following technical scheme: a cutter head structure for a miniature shield machine comprises a shield machine cutter head, wherein a strip-shaped groove is formed in the center of the shield machine cutter head, a central hobbing cutter assembly is embedded in the middle of the strip-shaped groove, five central hobbing cutter tools are installed in the middle of the central hobbing cutter assembly, three edge scraper installation clamping grooves which are distributed at equal angles are formed in the outer side of the shield machine cutter head, and three central scraper installation clamping grooves are formed in the middle of the three edge scraper installation clamping grooves and the central hobbing cutter assembly;
ten peripheral hob installation clamping grooves are formed in the surface of a cutter disc of the shield machine, the positions of the peripheral hob installation clamping grooves are randomly distributed, four peripheral hob installation clamping grooves are located on the surface of the cutter disc of the shield machine and are distributed on the periphery of a central hob assembly, the other six peripheral hob installation clamping grooves are distributed on the periphery of the cutter disc of the shield machine and form different inclination angles with the cutter disc of the shield machine, a peripheral hob mechanism is arranged in the middle of each peripheral hob installation clamping groove and comprises a peripheral hob installation seat, the peripheral hob installation seats are embedded in the middle of the peripheral hob installation clamping grooves, side limiting plates are arranged in the middle of the peripheral hob installation seats, peripheral hob positioning shaft rods penetrate through the middle of the side limiting plates, and a peripheral hob positioning mechanism is arranged on one side of each peripheral hob positioning shaft rod;
the peripheral hobbing cutter positioning mechanism comprises a limiting supporting block, a limiting pressing block is arranged between one end of the limiting supporting block and the inner wall of the central hobbing cutter, one end of a peripheral hobbing cutter positioning shaft rod penetrating through a peripheral hobbing cutter mounting seat penetrates through the limiting pressing block and the limiting supporting block, two limiting supporting block mounting pins are arranged below the limiting supporting block, the limiting supporting block mounting pins penetrate through the bottom end of the peripheral hobbing cutter mounting seat, a hobbing cutter mounting seat internal connecting block is arranged below the limiting pressing block, two limiting nuts are arranged below the hobbing cutter mounting seat, and a limiting bolt penetrates through the middle of the limiting pressing block.
Preferably, the edge scraper is installed in the middle of the edge scraper installation clamping groove, the center scraper is installed in the middle of the center scraper installation clamping groove, and the edge scraper and the center scraper are perpendicular to the cutter head of the shield tunneling machine.
Preferably, the bottom surface of the peripheral hob mounting seat is provided with a hob connecting block, the hob connecting block is embedded in the bottom surface of the peripheral hob mounting clamping groove, and a hob fixing screw penetrates through the middle of the hob connecting block.
Preferably, the threaded end of the cutter head fixing screw penetrates through the bottom of the cutter head connecting block and is screwed into the bottom surface of the peripheral hob mounting clamping groove, and the cutter head connecting block is fixedly connected with the peripheral hob mounting seat.
Preferably, single-edge hobs are arranged between the two peripheral hob positioning shaft levers and the limiting support blocks and between the two peripheral hob positioning shaft levers and the limiting press blocks, and double-edge hobs are arranged between the other eight peripheral hob positioning shaft levers and the limiting support blocks and between the other eight peripheral hob positioning shaft levers and the limiting press blocks.
Preferably, the middle of the single-edge hob and the middle of the double-edge hob are provided with positioning holes in a penetrating mode, the peripheral hob positioning shaft rod penetrates through the middle of the positioning holes, and the ball bearings are arranged between the peripheral hob positioning shaft rod and the inner walls of the positioning holes.
Preferably, the two ends of the lateral limiting plate are provided with connecting pins in a penetrating mode, and two symmetrical connecting pressing plates are arranged above the peripheral hob installing seat.
Preferably, the top end of the connecting pin penetrates through the upper surface of the peripheral hob mounting seat, a fastening pin hole penetrates through the middle of the upper surface and the lower surface of the connecting pressing plate, and the connecting pin penetrates through the top end of the surface of the peripheral hob mounting seat and is inserted into the fastening pin hole.
Preferably, the bottom surface of the limit support block is provided with two fixing holes, and the top end of the limit support block mounting pin penetrates through the bottom end of the peripheral hob mounting seat and is inserted into the fixing holes.
Preferably, a positioning hole penetrates through the middle of the internal connecting block of the hob mounting seat, and the bottom end of the limiting bolt penetrates through the middle of the positioning hole and penetrates through the middle of the two limiting nuts in a spiral mode.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, the plurality of hobbing cutters are arranged on the surface of the miniature shield machine, the hobbing cutters are divided into a double-edge hobbing cutter and a single-edge hobbing cutter, the two hobbing cutters are arranged on the cutter head of the miniature shield machine at different inclination angles, and the movement tracks of the hobbing cutters are not overlapped when the cutter head of the miniature shield machine moves, so that the soil layer on the inner wall of the tunnel is better crushed, and the working efficiency of the miniature shield machine is effectively improved.
Drawings
FIG. 1 is a schematic structural view of the present invention as a whole;
FIG. 2 is a partial structural sectional view of a cutter head of the shield tunneling machine of the present invention;
FIG. 3 is a schematic view of the peripheral hob mechanism according to the present invention;
FIG. 4 is a schematic view of a partial structure of the peripheral hob mechanism of the present invention;
FIG. 5 is a schematic view of a partial structure of a single-edged hob according to the present invention;
fig. 6 is a schematic structural diagram of the peripheral hob positioning mechanism of the present invention.
In the figure: 1. a cutter head of the shield tunneling machine; 2. a central hob assembly; 3. a central hob cutter; 4. a peripheral hob mechanism; 401. a peripheral hob positioning shaft lever; 402. a lateral limiting plate; 403. a peripheral hob mounting seat; 404. connecting the pressing plate; 405. connecting pins; 406. a cutter head connecting block; 407. a cutter head fixing screw; 5. a peripheral hob positioning mechanism; 501. a limiting supporting block; 502. a limiting pressing block; 503. a connecting block is arranged in the hob mounting seat; 504. a limit bolt; 505. a pin is installed on the limiting supporting block; 506. a limit nut; 6. the central scraper is provided with a clamping groove; 7. a single-edge hob; 8. a double-edged hob; 9. a clamping groove is formed in the peripheral hob; 10. the edge scraper is provided with a clamping groove; 11. an edge scraper; 12. a center scraper.
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.
Referring to fig. 1 to 6, an embodiment of the present invention: a cutter head structure for a miniature shield machine comprises a shield machine cutter head 1, wherein a strip-shaped groove is formed in the center of the shield machine cutter head 1, a central hob assembly 2 is embedded in the middle of the strip-shaped groove, five central hob cutters 3 are installed in the middle of the central hob assembly 2, three edge scraper installation clamping grooves 10 which are distributed at equal angles are formed in the outer side of the shield machine cutter head 1, and three central scraper installation clamping grooves 6 are formed in the middles of the three edge scraper installation clamping grooves 10 and the central hob assembly 2;
ten peripheral hob installation clamping grooves 9 are formed in the surface of a cutter head 1 of the shield machine, the positions of the peripheral hob installation clamping grooves 9 are randomly distributed, wherein four peripheral hob installation clamping grooves 9 are located on the surface of the cutter head 1 of the shield machine and are distributed on the periphery of a central hob assembly 2, the other six peripheral hob installation clamping grooves 9 are distributed on the periphery of the cutter head 1 of the shield machine and have different inclination angles with the cutter head 1 of the shield machine, a peripheral hob mechanism 4 is arranged in the middle of the peripheral hob installation clamping grooves 9, each peripheral hob mechanism 4 comprises a peripheral hob installation seat 403, the peripheral hob installation seats 403 are embedded in the middle of the peripheral hob installation clamping grooves 9, a side limiting plate 402 is arranged in the middle of each peripheral hob installation seat 403, a peripheral hob positioning shaft rod 401 penetrates through the middle of each side limiting plate 402, and a peripheral hob positioning mechanism 5 is arranged on one side of each peripheral hob positioning shaft rod 401;
peripheral hobbing cutter positioning mechanism 5 includes limit support block 501, be provided with limit briquetting 502 in the middle of the inner wall of limit support block 501's one end and central hobbing cutter 3, peripheral hobbing cutter location axostylus axostyle 401 runs through the one end of peripheral hobbing cutter mount pad 403 and passes from limit briquetting 502 and limit support block 501's centre, the below of limit support block 501 is provided with two limit support block erection pins 505, limit support block erection pin 505 passes from the bottom of peripheral hobbing cutter mount pad 403, the below of limit briquetting 502 is provided with hobbing cutter mount pad internal connection piece 503, hobbing cutter mount pad internal connection piece 503 is located the below and the below of peripheral hobbing cutter mount pad 403 and is provided with two limit nut 506, the centre of limit briquetting 502 runs through and is provided with limit bolt 504.
An edge scraper 11 is arranged in the middle of the edge scraper mounting clamping groove 10, a center scraper 12 is arranged in the middle of the center scraper mounting clamping groove 6, and both the edge scraper 11 and the center scraper 12 are perpendicular to the shield tunneling machine cutter head 1.
Wherein a single-edge hob 7 is arranged between the two peripheral hob positioning shaft rods 401 and the limiting support block 501, and the limiting pressing block 502, a double-edge hob 8 is arranged between the eight peripheral hob positioning shaft rods 401 and the limiting support block 501, and the limiting pressing block 502, positioning holes are arranged between the single-edge hob 7 and the double-edge hob 8 in a penetrating manner, the peripheral hob positioning shaft rods 401 pass through the positioning holes, and ball bearings are arranged between the peripheral hob positioning shaft rods 401 and the inner walls of the positioning holes.
Through adopting above-mentioned technical scheme, the crushing effect of the different single-edged hob 7 of sword number and twolip hob 8 when carrying out the breakage to the soil layer is different, and the intercombination can be better, more efficient carries out the breakage to the soil layer.
The bottom surface of the peripheral hob mounting seat 403 is provided with a hob connecting block 406, the hob connecting block 406 is buried in the bottom surface of the peripheral hob mounting groove 9, a hob fixing screw 407 penetrates through the middle of the hob connecting block 406, a threaded end of the hob fixing screw 407 penetrates through the bottom of the hob connecting block 406 and is screwed into the bottom surface of the peripheral hob mounting groove 9, and the hob connecting block 406 is fixedly connected with the peripheral hob mounting seat 403.
By adopting the above technical scheme, the peripheral hob mounting seat 403 embedded in the peripheral hob mounting slot 9 can be fixed in position, and it is ensured that the peripheral hob mounting seat 403 cannot be easily separated from the peripheral hob mounting slot 9.
Two fixing holes are formed in the bottom surface of the limit support block 501, and the top end of the limit support block mounting pin 505 penetrates through the bottom end of the peripheral hob mounting seat 403 and is inserted into the fixing holes.
Through adopting above-mentioned technical scheme, carry out position fixing to limit support block 501, can not appear the position removal or not hard up when guaranteeing limit support block 501 to the tip support of peripheral hob positioning shaft pole 401.
The middle of the hob mounting seat internal connection block 503 is provided with a positioning hole in a penetrating manner, and the bottom end of the limit bolt 504 penetrates through the middle of the positioning hole and penetrates through the middle of the two limit nuts 506 in a spiral manner.
Through adopting above-mentioned technical scheme, pass the bottom of spacing bolt 504 from the centre of hobbing cutter mount pad internal connection piece 503 and be connected with stop nut 506, can apply decurrent pulling force to spacing briquetting 502 for spacing briquetting 502 extrudees peripheral hobbing cutter location axostylus axostyle 401, makes peripheral hobbing cutter location axostylus axostyle 401 tip unable removal.
The two ends of the side limiting plate 402 are provided with connecting pins 405 in a penetrating mode, two symmetrical connecting pressing plates 404 are arranged above the peripheral hob installing seat 403, the top ends of the connecting pins 405 penetrate through the upper surface of the peripheral hob installing seat 403, fastening pin holes are formed in the middles of the upper surface and the lower surface of the connecting pressing plates 404 in a penetrating mode, and the top ends of the connecting pins 405 penetrating through the surface of the peripheral hob installing seat 403 are inserted into the fastening pin holes.
By adopting the technical scheme, the position of the side limiting plate 402 in the middle of the peripheral hob mounting seat 403 can be fixed by the connecting pin 405 and the connecting pressing plate 404, and the side limiting plate 402 is guaranteed not to move or loosen.
The working principle is as follows: when in use, firstly the peripheral hob positioning shaft lever 401 passes through the middle of the single-edge hob 7 or the double-edge hob 8, then the peripheral hob mounting seat 403 is turned over, the side limiting plate 402 is mounted in the middle of the peripheral hob mounting seat 403, the two connecting pressing plates 404 are mounted in place, then the two connecting pins 405 pass through the two ends of the side limiting plate 402 and are assembled with the connecting pressing plates 404, after the assembly is finished, one end of the peripheral hob positioning shaft lever 401 is inserted in the middle of the side limiting plate 402, then the limiting supporting block 501 is mounted at the other end of the peripheral hob positioning shaft lever 401, the limiting supporting block 501 is fixed through the limiting supporting block mounting pin 505, after the fixing of the limiting supporting block 501 is finished, the limiting pressing block 502 is mounted in the middle of the inner walls of the peripheral hob positioning shaft lever 401 and the central hob cutter 3, and the hob mounting seat internal connection block 503 is placed below the peripheral hob mounting seat 403, at this time, the limit bolt 504 penetrates through the limit pressing block 502 and the hob mounting seat internal connection block 503 and is assembled and connected with the limit bolt 504 by using the limit nut 506 and is tightened, finally, the assembled peripheral hob mounting seat 403 is embedded in the peripheral hob mounting slot 9 and is fixed by the hob fixing screw 407, at this time, the micro shield machine can be started to work, the driving mechanism of the micro shield machine drives the shield machine cutterhead 1 to rotate to crush the soil layer, because the peripheral hob mounting seat 403 installed in the peripheral hob mounting slot 9 has different-angle inclinations, the single-edge hob 7 or the double-edge hob 8 rotating with the shield machine cutterhead 1 and working can incline with the soil layer, so that the movement trajectories of the single-edge hob 7 and the double-edge hob 8 do not coincide with each other, the crushing to the soil layer is more thorough, and the working efficiency of the strip micro shield machine is effective.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. The utility model provides a miniature shield constructs machine blade disc structure, includes shield constructs quick-witted blade disc (1), its characterized in that: a strip-shaped groove is formed in the center of the shield tunneling machine cutter disc (1), a central hob assembly (2) is embedded in the middle of the strip-shaped groove, five central hob cutters (3) are installed in the middle of the central hob assembly (2), three equal-angle-distribution edge scraper installation clamping grooves (10) are formed in the outer side of the shield tunneling machine cutter disc (1), and three central scraper installation clamping grooves (6) are formed in the middle of the edge scraper installation clamping grooves (10) and the central hob assembly (2);
ten peripheral hob installation clamping grooves (9) are formed in the surface of the shield machine cutter head (1), the positions of the peripheral hob installation clamping grooves (9) are randomly distributed, wherein four peripheral hob installation clamping grooves (9) are located on the surface of the shield machine cutter head (1) and distributed on the periphery of the central hob assembly (2), the other six peripheral hob installation clamping grooves (9) are distributed at the periphery of the shield machine cutter head (1) and form different inclination angles with the shield machine cutter head (1), a peripheral hob mechanism (4) is arranged in the middle of each peripheral hob installation clamping groove (9), each peripheral hob mechanism (4) comprises a peripheral hob installation seat (403), each peripheral hob installation seat (403) is embedded in the middle of each peripheral hob installation clamping groove (9), a limiting plate (402) is arranged on the lateral side of the middle of each peripheral hob installation seat (403), a peripheral hob positioning shaft lever (401) penetrates through the middle of each limiting plate (402), and a peripheral hob positioning mechanism (5) is arranged on one side of each peripheral hob positioning shaft lever (401);
the peripheral hob positioning mechanism (5) comprises a limiting support block (501), a limiting pressing block (502) is arranged between one end of the limiting support block (501) and the inner wall of the central hob cutter (3), one end of the peripheral hob positioning shaft rod (401) penetrating through the peripheral hob mounting seat (403) penetrates through the limiting pressing block (502) and the limiting support block (501), two limiting support block mounting pins (505) are arranged below the limiting support block (501), the limiting support block mounting pins (505) penetrate through the bottom end of the peripheral hob mounting seat (403), a hob mounting seat internal connection block (503) is arranged below the limiting pressing block (502), the hob mounting seat internal connection block (503) is located below the peripheral hob mounting seat (403) and two limiting nuts (506) are arranged below the hob mounting seat, and a limiting bolt (504) penetrates through the middle of the limiting pressing block (502).
2. The cutter head structure for the micro shield tunneling machine according to claim 1, wherein: edge scraper (11) are installed to the centre of edge scraper mounting groove (10), center scraper (12) are installed to the centre of center scraper mounting groove (6), edge scraper (11) and center scraper (12) all are perpendicular with shield structure machine blade disc (1).
3. The cutter head structure for the micro shield tunneling machine according to claim 1, wherein: the bottom surface of peripheral hobbing cutter mount pad (403) is provided with blade disc connecting block (406), blade disc connecting block (406) bury in the bottom surface of peripheral hobbing cutter installation draw-in groove (9) and the middle cutter head set screw (407) of interlude.
4. The cutter head structure for the micro shield tunneling machine according to claim 3, wherein: the thread end of the cutter head fixing screw (407) penetrates through the bottom of the cutter head connecting block (406) and is screwed into the bottom surface of the peripheral hob mounting clamping groove (9), and the cutter head connecting block (406) is fixedly connected with the peripheral hob mounting seat (403).
5. The cutter head structure for the micro shield tunneling machine according to claim 1, wherein: the middle of the two peripheral hob positioning shaft rods (401), the limiting support blocks (501) and the limiting pressing blocks (502) is provided with a single-edge hob (7), and the middle of the other eight peripheral hob positioning shaft rods (401), the limiting support blocks (501) and the limiting pressing blocks (502) is provided with a double-edge hob (8).
6. The cutter head structure for the micro shield tunneling machine according to claim 5, wherein: the middle of the single-edge hob (7) and the middle of the double-edge hob (8) are provided with positioning holes in a penetrating mode, the peripheral hob positioning shaft rod (401) penetrates through the middle of the positioning holes, and a ball bearing is arranged between the peripheral hob positioning shaft rod (401) and the inner wall of the positioning holes.
7. The cutter head structure for the micro shield tunneling machine according to claim 1, wherein: and connecting pins (405) penetrate through two ends of the lateral limiting plate (402), and two symmetrical connecting pressing plates (404) are arranged above the peripheral hob mounting seat (403).
8. The cutter head structure for the micro shield tunneling machine according to claim 7, wherein: the top end of the connecting pin (405) penetrates through the upper surface of the peripheral hob mounting seat (403), a fastening pin hole penetrates through the middle of the upper surface and the lower surface of the connecting pressing plate (404), and the top end of the connecting pin (405) penetrating through the surface of the peripheral hob mounting seat (403) is inserted into the fastening pin hole.
9. The cutter head structure for the micro shield tunneling machine according to claim 1, wherein: the bottom surface of the limiting support block (501) is provided with two fixing holes, and the top end of the limiting support block mounting pin (505) penetrates through the bottom end of the peripheral hob mounting seat (403) and is inserted into the fixing holes.
10. The cutter head structure for the micro shield tunneling machine according to claim 1, wherein: the middle of the hob mounting seat inner connecting block (503) is provided with a positioning hole in a penetrating mode, and the bottom end of the limiting bolt (504) penetrates through the middle of the positioning hole and penetrates through the middle of the two limiting nuts (506) in a spiral mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310047613.XA CN115949421A (en) | 2023-01-31 | 2023-01-31 | Cutter head structure for micro shield machine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310047613.XA CN115949421A (en) | 2023-01-31 | 2023-01-31 | Cutter head structure for micro shield machine |
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| CN115949421A true CN115949421A (en) | 2023-04-11 |
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| CN202310047613.XA Pending CN115949421A (en) | 2023-01-31 | 2023-01-31 | Cutter head structure for micro shield machine |
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