Tearing knife device for shield machine

Abstract

The present invention discloses a tearing knife device for a shield machine, comprising a shell, a tearing knife group, two support beams and a driving device; a knife box chamber and a driving chamber arranged on one side of the knife box chamber are arranged in the shell, and the upper part of the knife box chamber has an opening; the tearing knife group comprises a cross knife seat and four tearing knives respectively installed at the four side ends of the cross knife seat, the center of the cross knife seat is rotatably installed in the knife box chamber through a rotating shaft, and the tearing knife at the upper end of the cross knife seat extends out of the opening at the upper part of the knife box chamber; the two support beams pass through the knife box chamber, and are respectively arranged on both sides of the lower part of the cross knife seat and supported on the lower sides of the two sides of the cross knife seat; the driving device is arranged in the driving chamber. Compared with the prior art, the present invention has a more stable structure, a stronger overall bearing capacity, and is not prone to deformation and damage.

Description

Technical Field

[0001] The invention relates to the technical field of shield machines, and in particular to a tearing knife device for a shield machine. Background Art

[0002] The tools of the shield machine include rollers, scrapers, tearing knives, etc. Among them, the tearing knives are the advanced tools of the shield machine. They are installed at the front end of the shield cutter head. Under the action of the thousand-ton thrust of the shield machine, the tip of the knife is directly inserted into the soil layer. With the rotation of the cutter head, the soil layer is directly torn and loosened. It is often used for excavation in soft soil below 20Mpa or fully weathered rock geological layers. It is the main tool for shield machines to excavate in soft soil layers.

[0003] The tearing cutter is the main tool and its service life is about 1 kilometer under normal conditions. Its service life will be greatly reduced when encountering sudden changes in the stratum or improper operation. If the cutter is not replaced in time after being worn out, the shield machine will not be able to excavate normally.

[0004] Chinese invention patent CN110886615A discloses a tearing knife device for a shield machine, which includes a knife box, a knife seat, at least two tearing knives, a rotation drive mechanism and a locking mechanism; the knife seat is rotatably connected to the knife box through a rotating shaft; the tearing knife is installed on the knife seat along the rotation direction of the rotating shaft; the rotation drive mechanism is connected to the rotating shaft to drive the rotating shaft to rotate so that the corresponding tearing knife rotates to the working position; the locking mechanism is connected to the rotating shaft to lock the rotating shaft after the corresponding tearing knife rotates to the working position. The present invention can achieve the knife replacement without manual entry into the soil bin, has the characteristics of fast knife replacement speed and high safety, and improves its continuous excavation life.

[0005] The rotating shaft needs to bear greater pressure and torque, but the tearing knife of the tearing knife device for the shield machine is mainly loaded by the rotating shaft, and the rotating shaft is locked by extending the clamping rod into the clamping hole. The overall load-bearing capacity is relatively weak, and the structure is prone to deformation and damage. Summary of the invention

[0006] In view of the defects in the prior art, the present invention provides a tearing knife device for a shield machine, so that the structure is more stable, the overall bearing capacity is stronger, and it is not easy to be deformed and damaged.

[0007] The present invention provides a tearing knife device for a shield machine, comprising:

[0008] A housing, wherein a knife box chamber and a driving chamber are arranged on one side of the knife box chamber, and an upper portion of the knife box chamber has an opening;

[0009] A tearing knife assembly, the tearing knife assembly comprising a cross knife seat and four tearing knives respectively mounted on four side ends of the cross knife seat, the center of the cross knife seat being rotatably mounted in the knife box chamber via a rotating shaft, and the tearing knife at the upper end of the cross knife seat extending out of an opening at the upper part of the knife box chamber;

[0010] Two support beams, the two support beams pass through the knife box chamber, and are respectively arranged on both sides of the lower part of the cross knife seat and supported on the lower sides of the two side parts of the cross knife seat;

[0011] And a driving device, which is arranged in the driving chamber. When switching the tearing knife, the two supporting beams are first driven to exit the knife box chamber by the driving device, and then the tearing knife group is driven to rotate by the driving device, so that the corresponding tearing knife rotates out of the opening at the upper part of the knife box chamber, and finally the two supporting beams are driven to penetrate into the knife box chamber by the driving device and re-supported on the lower sides of the two sides of the cross knife seat.

[0012] Furthermore, the driving device comprises:

[0013] A first transmission mechanism, the first transmission mechanism comprising a first transmission rod rotatably mounted in the driving chamber, a first gear coaxially mounted on one end of the first transmission rod, a first bevel gear coaxially mounted on the other end of the first transmission rod, and a second bevel gear coaxially mounted on one end of the rotating shaft and meshing with the first bevel gear;

[0014] A second transmission mechanism, the second transmission mechanism comprising a second transmission rod rotatably mounted in the driving chamber, a second gear coaxially mounted on one end of the second transmission rod, two racks extending along the two support beams respectively, and two third gears coaxially mounted on the second transmission rod and respectively meshing with the two racks, the second transmission rod being parallel to the first transmission rod;

[0015] A first driving mechanism, the first driving mechanism comprising a motor and a fourth gear, the motor being fixed in the driving chamber, the output end of the motor being provided with a driving shaft coaxial with the second transmission rod, the fourth gear being coaxially mounted on an end of the driving shaft close to the second gear;

[0016] And a second driving mechanism, the second driving mechanism includes a telescopic cylinder and a fifth gear, the telescopic cylinder is fixed in the driving chamber, the output shaft of the telescopic cylinder is arranged parallel to the first transmission rod and the second transmission rod, the fifth gear is coaxially installed on the output shaft of the telescopic cylinder, when the telescopic cylinder drives the fifth gear to move to the first position, the fifth gear is respectively engaged with the first gear and the fourth gear, when the telescopic cylinder drives the fifth gear to move to the second position, the fifth gear is respectively engaged with the second gear and the fourth gear.

[0017] Further, a spline is provided at one end of the first transmission rod, a spline matching groove is provided in the first gear, the spline is inserted into the spline matching groove, a boss and a retaining ring are provided at one end of the first gear away from the first transmission rod, the boss is provided with a polished rod section and a spline section in sequence from the first gear to the end, a locking groove is provided at the rear of the first gear, the notch of the locking groove faces the first gear and is provided with a convex ring, the inner wall of the convex ring forms a spline groove matching the spline section, a compression spring supported between the bottom of the locking groove and the boss is provided in the locking groove, and the retaining ring protrudes radially from the periphery of the first gear;

[0018] A sixth gear is coaxially mounted on the first transmission rod, and a seventh gear is coaxially mounted on the second transmission rod between the second gear and the third gear. When the telescopic cylinder drives the fifth gear to move to the third position, the fifth gear meshes with the sixth gear and the seventh gear respectively.

[0019] Furthermore, a sliding block adapted to fit in the locking groove is provided at the end of the boss.

[0020] Furthermore, the driving chamber is divided into a power chamber and a transmission chamber by a partition;

[0021] The motor and telescopic cylinder of the driving device are placed in the power chamber, and other components are placed in the transmission chamber.

[0022] Furthermore, the two racks are respectively arranged on the sides of the two support beams, and each of the third gears is supported under the corresponding rack. The tool box chamber is located outside the sliding path of each of the support beams and is also provided with a guide groove for guiding the upper part of each support beam.

[0023] Furthermore, the cross section of the support beam is rectangular, and two side surfaces of the support beam respectively abut against the side and lower portion of the cross knife seat.

[0024] Furthermore, the upper sides of the tearing knives on both sides of the cross knife seat are located below the opening of the upper part of the knife box chamber.

[0025] The beneficial effects of the present invention are embodied in:

[0026] Four tearing knives are installed on a cross knife seat of the present application. When one tearing knife is worn, it is only necessary to switch the tearing knife. When switching the tearing knife, the two supporting beams are first driven out of the knife box chamber by the driving device, and then the tearing knife group is driven to rotate by the driving device to make the corresponding tearing knife rotate out of the opening at the upper part of the knife box chamber, and finally the two supporting beams are driven into the knife box chamber by the driving device and re-supported on the lower sides of the two sides of the cross knife seat, thereby realizing the switching of the tearing knives. When switching, there is no need to manually enter the soil bin to change the knife, and the continuous excavation life of the shield machine is increased by four times.

[0027] During the operation, the present application supports the cross knife seat through two support beams. Compared with the prior art, its structure is more stable, its overall bearing capacity is stronger, and it is not easy to deform or damage. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0029] Figure 1 It is a front view of the tearing knife assembly according to an embodiment of the present invention;

[0030] Figure 2 A side view of a support beam of an embodiment of the present invention when inserted into a tool box chamber;

[0031] Figure 3 A side view of the support beam of the embodiment of the present invention when exiting the tool box chamber;

[0032] Figure 4 It is a schematic structural diagram of the driving device when the fifth gear is located at the first position according to an embodiment of the present invention;

[0033] Figure 5 It is a schematic structural diagram of the driving device when the fifth gear is located at the second position according to an embodiment of the present invention;

[0034] Figure 6 It is a schematic structural diagram of the driving device when the fifth gear is located at the third position according to an embodiment of the present invention.

[0035] In the accompanying drawings, 100-housing; 110-knife box chamber; 111-opening; 120-driving chamber; 121-power chamber; 122-transmission chamber; 130-partition plate; 140-guide groove; 200-tearing knife group; 210-cross knife seat; 220-tearing knife; 230-rotating shaft; 300-support beam; 400-driving device; 410-first transmission mechanism; 411-first transmission rod; 4111-spline; 412-first gear; 413-first bevel gear; 414-second bevel gear; 415-protruding column; 416-second bevel gear; 417-second bevel gear; 418-second bevel gear; 419-second bevel gear; 420-second bevel gear; 421-second bevel gear; 422-second bevel gear; 423-second bevel gear; 424-second bevel gear; 425-second bevel gear; 426-second bevel gear; 427-second bevel gear; 428-second bevel gear; 429-second bevel gear; 430-second bevel gear; 431-second bevel gear; 432-second bevel gear; 433-second bevel gear; 434-second bevel gear; 435-second bevel gear; 436-second bevel gear; 437-second bevel gear; 438-second bevel gear; 439-second bevel gear; 440-second bevel gear; 441-second bevel gear; 442-second bevel gear; 443-second bevel gear; 444-second bevel gear; 445-second bevel gear; 446-second bevel gear; 447-second be 51-bare rod section; 4152-spline section; 416-retaining ring; 417-locking groove; 418-convex ring; 419-compression spring; 4110-sixth gear; 4111-slider; 420-second transmission mechanism; 421-second transmission rod; 422-second gear; 423-rack; 424-third gear; 425-seventh gear; 430-first drive mechanism; 431-motor; 432-fourth gear; 433-drive shaft; 440-second drive mechanism; 441-telescopic cylinder; 442-fifth gear. DETAILED DESCRIPTION

[0036] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0037] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in this application should have the common meanings understood by those skilled in the art to which the present invention belongs.

[0038] like Figure 1-Figure 6 As shown, an embodiment of the present invention provides a tearing knife device for a shield machine, including a housing 100 , a tearing knife assembly 200 , two support beams 300 and a driving device 400 .

[0039] A tool box chamber 110 and a driving chamber 120 disposed at one side of the tool box chamber 110 are disposed in the housing 100 . An opening 111 is formed at an upper portion of the tool box chamber 110 .

[0040] The tearing knife assembly 200 includes a cross knife seat 210 and four tearing knives 220 respectively installed at the four side ends of the cross knife seat 210. The center of the cross knife seat 210 is rotatably installed in the knife box chamber 110 through a rotating shaft 230, and the tearing knife 220 at the upper end of the cross knife seat 210 extends out of the opening 111 at the upper part of the knife box chamber 110.

[0041] Two support beams 300 pass through the tool box chamber 110 , and are respectively disposed on both sides of the lower portion of the cross tool holder 210 and supported on the lower sides of both sides of the cross tool holder 210 .

[0042] The driving device 400 is arranged in the driving chamber 120. When switching the tearing knife 220, the driving device 400 is first used to drive the two support beams 300 to exit the knife box chamber 110, and then the driving device 400 is used to drive the tearing knife group 200 to rotate so that the corresponding tearing knife 220 rotates out of the opening 111 at the upper part of the knife box chamber 110. Finally, the driving device 400 is used to drive the two support beams 300 to penetrate into the knife box chamber 110 and re-support on the lower side of the two sides of the cross knife seat 210.

[0043] like Figure 1 and Figure 2 As shown, four tearing knives 220 are installed on a cross knife seat 210 of the present application. When a tearing knife 220 is worn, it is only necessary to switch the tearing knife 220. When switching the tearing knife 220, the two support beams 300 are first driven to exit the knife box chamber 110 by the driving device 400, and then the tearing knife group 200 is driven to rotate by the driving device 400, so that the corresponding tearing knife 220 rotates out of the opening 111 at the upper part of the knife box chamber 110, and finally the two support beams 300 are driven by the driving device 400 to penetrate into the knife box chamber 110 and re-supported on the lower sides of the two sides of the cross knife seat 210, thereby realizing the switching of the tearing knife 220. There is no need to manually enter the soil bin to change the knife during switching, and the continuous excavation life of the shield machine is increased by four times.

[0044] During operation, the present application supports the cross knife seat 210 through two support beams 300. Compared with the prior art, its structure is more stable, its overall bearing capacity is stronger, and it is not easy to deform or damage.

[0045] Reference Figure 4-Figure 6 In a specific embodiment, the driving device 400 includes a first transmission mechanism 410 , a second transmission mechanism 420 , a first driving mechanism 430 and a second driving mechanism 440 .

[0046] The first transmission mechanism 410 includes a first transmission rod 411 rotatably installed in the driving chamber 120, a first gear 412 coaxially installed at one end of the first transmission rod 411, a first bevel gear 413 coaxially installed at the other end of the first transmission rod 411, and a second bevel gear 414 coaxially installed at one end of the rotating shaft 230 and meshing with the first bevel gear 413.

[0047] The second transmission mechanism 420 includes a second transmission rod 421 rotatably installed in the driving chamber 120, a second gear 422 coaxially installed at one end of the second transmission rod 421, two racks 423 extending along two support beams 300 respectively, and two third gears 424 coaxially installed on the second transmission rod 421 and respectively meshing with the two racks 423. The second transmission rod 421 is parallel to the first transmission rod 411.

[0048] The first driving mechanism 430 includes a motor 431 and a fourth gear 432 . The motor 431 is fixed in the driving chamber 120 . The output end of the motor 431 is provided with a driving shaft 433 coaxial with the second transmission rod 421 . The fourth gear 432 is coaxially installed at one end of the driving shaft 433 close to the second gear 422 .

[0049] The second driving mechanism 440 includes a telescopic cylinder 441 and a fifth gear 442. The telescopic cylinder 441 is fixed in the driving chamber 120. The output shaft of the telescopic cylinder 441 is arranged parallel to the first transmission rod 411 and the second transmission rod 421. The fifth gear 442 is coaxially installed on the output shaft of the telescopic cylinder 441. When the telescopic cylinder 441 drives the fifth gear 442 to move to the first position, the fifth gear 442 is respectively meshed with the first gear 412 and the fourth gear 432. When the telescopic cylinder 441 drives the fifth gear 442 to move to the second position, the fifth gear 442 is respectively meshed with the second gear 422 and the fourth gear 432.

[0050] When the driving device 400 drives the tearing knife group 200 to rotate, the fifth gear 442 is first driven to move to the first position through the telescopic cylinder 441. At this time, the fifth gear 442 is respectively engaged with the first gear 412 and the fourth gear 432, and then the fourth gear 432 is driven to rotate through the motor 431. The fourth gear 432 then drives the first gear 412 to rotate through the fifth gear 442, thereby driving the first transmission rod 411 to rotate. The first transmission rod 411 then drives the second bevel gear 414 to rotate through the first bevel gear 413, thereby driving the tearing knife group 200 to rotate.

[0051] When the driving device 400 drives the support beam 300 to move, the fifth gear 442 is first driven to move to the second position through the telescopic cylinder 441. At this time, the fifth gear 442 is respectively engaged with the second gear 422 and the fourth gear 432, and then the fourth gear 432 is driven to rotate through the motor 431. The fourth gear 432 then drives the second gear 422 to rotate through the fifth gear 442, thereby driving the second transmission rod 421 to rotate. The second transmission rod 421 then drives the racks 423 on the two support beams 300 to move through the two third gears 424, thereby driving the support beam 300 to move.

[0052] Preferably, a spline 4111 is provided at one end of the first transmission rod 411, a spline adaptation groove is provided in the first gear 412, the spline 4111 is inserted into the spline adaptation groove, and a boss 415 and a retaining ring 416 are provided at one side end of the first gear 412 away from the first transmission rod 411, and the boss 415 is provided with a light rod section 4151 and a spline section 4152 in sequence from the first gear 412 to the end, and a locking groove 417 is provided at the rear of the first gear 412, the notch of the locking groove 417 faces the first gear 412 and is provided with a convex ring 418, the inner wall of the convex ring 418 forms a spline groove adapted to the spline section 4152, and a compression spring 419 supported between the bottom of the locking groove 417 and the boss 415 is provided in the locking groove 417, and the retaining ring 416 protrudes radially from the periphery of the first gear 412.

[0053] A sixth gear 4110 is coaxially mounted on the first transmission rod 411, and a seventh gear 425 is coaxially mounted on the second transmission rod 421 between the second gear 422 and the third gear 424. When the telescopic cylinder 441 drives the fifth gear 442 to move to the third position, the fifth gear 442 meshes with the sixth gear 4110 and the seventh gear 425 respectively.

[0054] like Figure 6 As shown, during normal operation, under the action of the compression spring 419, the spline section 4152 of the boss 415 is adapted to the spline groove in the convex ring 418, and the rotation of the first transmission rod 411 is locked. At this time, the fifth gear 442 is respectively engaged with the sixth gear 4110 and the seventh gear 425, so that the rotation of the second transmission rod 421 is also locked, and then the two support beams 300 are locked in the tool box chamber 110, which can prevent the support beam 300 from coming out of the tool box chamber 110 due to vibration and other reasons during operation. When exiting and driving the tearing knife group 200 to rotate, the fifth gear 442 is driven to move toward the tail end through the telescopic cylinder 441, and the fifth gear 442 first engages with the first gear 412, and then pushes the first gear 412 backward through the retaining ring 416, so that the spline section 4152 of the boss 415 is disengaged from the spline groove in the convex ring 418, and the light rod section 4151 of the boss 415 is adapted in the spline groove in the convex ring 418, and then the first transmission rod 411 can be driven to rotate by the motor 431, thereby driving the tearing knife group 200 to rotate.

[0055] In order to improve the sliding stability of the first gear 412 , a sliding block 4111 adapted to fit in the locking groove 417 is provided at the end of the protruding column 415 .

[0056] In this embodiment, the driving chamber 120 is divided into a power chamber 121 and a transmission chamber 122 by a partition 130. The motor 431 and the telescopic cylinder 441 of the driving device 400 are placed in the power chamber 121, and other components are arranged in the transmission chamber 122, so that the motor 431 and the telescopic cylinder 441 can be isolated and protected.

[0057] In this embodiment, two racks 423 are respectively arranged on the sides of two support beams 300, and each third gear 424 is respectively supported under the corresponding rack 423. A guide groove 140 for guiding the upper part of each support beam 300 is also arranged outside the tool box chamber 110 on the sliding path of each support beam 300. With the above design, on the one hand, the support beam 300 can be supported by the gear rack, and on the other hand, the upper part of the support beam 300 can be guided by the guide groove 140, so that the stability of the movement of the support beam 300 can be improved.

[0058] In this embodiment, the cross-section of the support beam 300 is rectangular, and the two side surfaces of the support beam 300 are respectively against the side and lower parts of the cross knife seat 210 , so that the contact area between the support beam 300 and the cross knife seat 210 can be increased, which is beneficial to improving the stability of the tearing knife group 200 .

[0059] In this embodiment, the upper sides of the tearing knives 220 on both sides of the cross knife seat 210 are located below the opening 111 at the upper part of the knife box chamber 110 , which can reduce the wear of the unused tearing knives 220 in the knife box chamber 110 .

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A tearing knife device for a shield machine, characterized in that: include, A housing, wherein a knife box chamber and a driving chamber are arranged on one side of the knife box chamber, and an upper portion of the knife box chamber has an opening; A tearing knife assembly, the tearing knife assembly comprising a cross knife seat and four tearing knives respectively mounted on four side ends of the cross knife seat, the center of the cross knife seat being rotatably mounted in the knife box chamber via a rotating shaft, and the tearing knife at the upper end of the cross knife seat extending out of an opening at the upper part of the knife box chamber; Two support beams, the two support beams pass through the knife box chamber, and are respectively arranged on both sides of the lower part of the cross knife seat and supported on the lower sides of the two side parts of the cross knife seat; and a driving device, the driving device being arranged in the driving chamber, and when the tearing knife is switched, the driving device is used to first drive the two support beams to exit the knife box chamber, and then the driving device is used to drive the tearing knife group to rotate, so that the corresponding tearing knife rotates out of the opening at the upper part of the knife box chamber, and finally the driving device is used to drive the two support beams to penetrate into the knife box chamber and be supported again on the lower sides of the two sides of the cross knife seat; The driving device comprises: A first transmission mechanism, the first transmission mechanism comprising a first transmission rod rotatably mounted in the driving chamber, a first gear coaxially mounted on one end of the first transmission rod, a first bevel gear coaxially mounted on the other end of the first transmission rod, and a second bevel gear coaxially mounted on one end of the rotating shaft and meshing with the first bevel gear; A second transmission mechanism, the second transmission mechanism comprising a second transmission rod rotatably mounted in the driving chamber, a second gear coaxially mounted on one end of the second transmission rod, two racks extending along the two support beams respectively, and two third gears coaxially mounted on the second transmission rod and respectively meshing with the two racks, the second transmission rod being parallel to the first transmission rod; A first driving mechanism, the first driving mechanism comprising a motor and a fourth gear, the motor being fixed in the driving chamber, the output end of the motor being provided with a driving shaft coaxial with the second transmission rod, the fourth gear being coaxially mounted on an end of the driving shaft close to the second gear; And a second driving mechanism, the second driving mechanism includes a telescopic cylinder and a fifth gear, the telescopic cylinder is fixed in the driving chamber, the output shaft of the telescopic cylinder is arranged parallel to the first transmission rod and the second transmission rod, the fifth gear is coaxially installed on the output shaft of the telescopic cylinder, when the telescopic cylinder drives the fifth gear to move to the first position, the fifth gear is respectively engaged with the first gear and the fourth gear, when the telescopic cylinder drives the fifth gear to move to the second position, the fifth gear is respectively engaged with the second gear and the fourth gear.

2. The tearing knife device for a shield machine according to claim 1, characterized in that: A spline is provided at one end of the first transmission rod, a spline matching groove is provided in the first gear, the spline is inserted into the spline matching groove, a convex column and a retaining ring are provided at one end of the first gear away from the first transmission rod, the convex column is provided with a polished rod section and a spline section in sequence from the first gear to the end, a locking groove is provided at the rear of the first gear, the notch of the locking groove faces the first gear and is provided with a convex ring, the inner wall of the convex ring forms a spline groove matching the spline section, a compression spring supported between the bottom of the locking groove and the convex column is provided in the locking groove, and the retaining ring protrudes radially from the periphery of the first gear; A sixth gear is coaxially mounted on the first transmission rod, and a seventh gear is coaxially mounted on the second transmission rod between the second gear and the third gear. When the telescopic cylinder drives the fifth gear to move to the third position, the fifth gear meshes with the sixth gear and the seventh gear respectively.

3. The tearing knife device for a shield machine according to claim 2, characterized in that: A sliding block adapted to fit in the locking groove is provided at the end of the convex column.

4. The tearing knife device for a shield machine according to claim 2, characterized in that: The driving chamber is divided into a power chamber and a transmission chamber by a partition; The motor and telescopic cylinder of the driving device are arranged in the power chamber, and other components are arranged in the transmission chamber.

5. The tearing knife device for a shield machine according to claim 1, characterized in that: The two racks are respectively arranged on the sides of the two support beams, and each of the third gears is supported under the corresponding rack. The tool box chamber is located outside the sliding path of each support beam and is also provided with a guide groove for guiding the upper part of each support beam.

6. The tearing knife device for a shield machine according to claim 1, characterized in that: The cross section of the support beam is rectangular, and two side surfaces of the support beam respectively abut against the side and lower portion of the cross knife seat.

7. The tearing knife device for a shield machine according to claim 1, characterized in that: The upper sides of the tearing knives on both sides of the cross knife seat are located below the opening on the upper part of the knife box chamber.

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