Mud cake resistant nested shield cutter head

Abstract

The utility model discloses a mud cake resistant nested shield cutter head which comprises a shield cutter head body which is in a circular ring shape and is fixed on a mother cutter holder, and the mother cutter holder is connected with a first main drive; the embedded small cutter head is located in the center of the shield cutter head body, the shield cutter head body and the embedded small cutter head are independent of each other, the embedded small cutter head is fixed to a sub-cutter holder, and the sub-cutter holder is connected with a second main drive through an automatic telescopic rod. And the washing assembly is connected with the nested small cutter head. The shield cutterhead is composed of the shield cutterhead body and the nested small cutterhead, the shield cutterhead body and the nested small cutterhead are jointly stressed in the shield tunneling process, the shield cutterhead body and the nested small cutterhead are provided with independent main drives, independent control can be achieved, nested small operation is driven by means of the time when segments are assembled, and accelerated cleaning of mud cakes in the center of the cutterhead is achieved.

Description

Technical Field

[0001] The utility model belongs to the technical field of shield machines, and in particular relates to a mud cake-resistant nested shield cutterhead. Background Art

[0002] The shield machine is a kind of engineering machinery used for underground tunnel excavation, which uses mechanical force and soil pressure to realize the excavation and advancement of underground tunnels. The shield machine has a wide range of applications and can be used for construction under various geological conditions. It has been widely used in urban subways, transportation tunnels, water conservancy projects and other fields due to its high safety and low environmental interference.

[0003] During the tunneling process of the shield machine, due to the low flow rate in the center of the shield cutter disc, mud residue is easily retained. Therefore, the shield mud cake is generally formed at the center of the cutter disc first, and then gradually spreads outward. The existence of mud cake will form additional cutting resistance, increase shield energy consumption and mechanical load, and reduce the working efficiency of the shield. Therefore, the control of slag cake is the main technical measure to ensure the smooth progress of shield tunneling.

[0004] At present, the devices for removing mud cake mostly adopt physical and chemical methods: using low temperature cooling, high pressure gas flushing, ultrasonic vibration to decompose and remove mud residue, and acid solution to soften and decompose clay. The shield cutterhead structure involved in this patented technology can be overlapped with the above-mentioned different cleaning technologies, or used independently according to actual conditions to achieve a more comprehensive and in-depth cleaning effect, thereby ensuring that the cutterhead can maintain the best operating state under complex and changeable geological conditions. Utility Model Content

[0005] In order to solve the above problems, the utility model proposes a nested shield cutter head that resists mud cake.

[0006] The utility model discloses a nested shield cutter disc that resists mud cake, comprising: a shield cutter disc body, which is in the shape of a circular ring and fixed on a main cutter seat, which is connected to a first main drive; a nested small cutter disc, which is located at the center of the shield cutter disc body, the shield cutter disc body and the nested small cutter disc are independent of each other, and the nested small cutter disc is fixed on a sub-cutter seat, which is connected to a second main drive via an automatic telescopic rod; and a flushing assembly, which is connected to the nested small cutter disc.

[0007] Optionally, the shield cutter head body includes a plurality of first main arms in a circular array, and the plurality of first main arms are connected by an outer ring reinforcement beam and an inner ring reinforcement beam.

[0008] Optionally, the first main arm is in a fan ring shape, a plurality of first shield cutters are arranged on the first main arm, and an end of the first main arm away from the center is fixed on the large support ring.

[0009] Optionally, there is a gap between the shield cutter head body and the nested small cutter head.

[0010] Optionally, the nested small cutter disc is in the shape of a disc, comprising a central disc and a plurality of second main arms distributed in a circular array on the outer circumference of the central disc, the second main arms being in the shape of a fan ring, the end of the second main arm away from the center being fixed on a small support ring, and a plurality of flushing holes being evenly installed on the outer side of the small support ring.

[0011] Optionally, the flushing assembly includes a flushing hole and a nozzle located on the nested small cutter disc, and the flushing hole and the nozzle are both connected to the water supply pipeline.

[0012] Optionally, the water pipeline is formed by connecting a first water pipeline, a second water pipeline, a third water pipeline and a fourth water pipeline.

[0013] Optionally, a nozzle is provided on the second main arm of the nested small cutter disc, and the nozzle includes a protective shell and a cross rubber sheet.

[0014] Optionally, a plurality of second shield cutters are provided on the second main arm of the nested small cutter disc, and the height of the nozzle is lower than the height of the second shield cutters on the nested small cutter disc.

[0015] Optionally, the rotation speed of the nested small cutter disc is higher than the rotation speed of the shield cutter disc body.

[0016] Optionally, the support method of the shield cutter head body is peripheral support, and the support method of the nested small cutter head is central support.

[0017] The beneficial effect of the utility model is that the shield cutterhead of the utility model is composed of a shield cutterhead body and a nested small cutterhead, and the two are subjected to force together during the shield excavation process, spatially dividing the excavation surface, reducing the load of each part, and reducing the wear of related components; the shield cutterhead body and the nested small cutterhead have independent main drives and can be controlled separately. When the pipe segments are assembled, the shield cutterhead body stops running, and the nested small cutterhead moves backward and continuously rotates to clean the mud cake in the center of the cutterhead. During shield excavation, the shield cutterhead body and the nested small cutterhead run simultaneously, and the rotation speed of the nested small cutterhead is higher than that of the shield cutterhead body, thereby accelerating the cleaning of the mud cake in the center of the cutterhead. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is the front view of the utility model.

[0019] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0020] Figure 3It is a structural schematic diagram of the utility model when it is in the first working state.

[0021] Figure 4 It is a structural schematic diagram of the utility model when it is in the second working state.

[0022] Figure 5 yes Figure 2 Schematic diagram of the BB cross section.

[0023] Figure 6 yes Figure 2 Schematic diagram of the CC section.

[0024] Figure 7 yes Figure 3 Enlarged view of the second water pipeline.

[0025] Reference numerals:

[0026] 1-shield cutter body, 11-first main arm, 12-first shield cutter, 13-large support ring, 14-mother cutter seat, 2-nested small cutter disc, 21-second main arm, 22-second shield cutter, 23-scouring hole, 24-nozzle, 241-protective shell, 242-cross rubber sheet, 243-first water pipeline, 244-second water pipeline, 245 third water pipeline, 246-fourth water pipeline, 2441-inner pipeline, 2442-outer pipeline, 2443-sealing gasket, 25-small support ring, 26-sub-cutter seat, 31-outer ring reinforcement beam, 32-inner ring reinforcement beam, 4-automatic telescopic rod, 51-thrust jack, 52-second main drive, 53-first main drive, 61-driving cabin, 62-soil bin partition, 63-soil pressure bin, 7-screw conveyor. DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0028] like Figure 1-Figure 6 As shown, the anti-mud cake nested shield cutter disc of the utility model comprises a shield cutter disc body 1, a nested small cutter disc 2 and a flushing assembly. The shield cutter disc body 1 is in a circular ring shape, and the shield cutter disc body 1 is fixed on a mother cutter seat 14, and the mother cutter seat 14 is connected to the first main drive 53. The support method of the shield cutter disc body 1 is a peripheral support type.

[0029] The nested small cutter disc 2 is located at the center of the shield cutter disc body 1. The shield cutter disc body 1 and the nested small cutter disc 2 are independent of each other, and there is a gap between the shield cutter disc body 1 and the nested small cutter disc 2. The shield cutter disc body 1 and the nested small cutter disc 2 do not affect each other.

[0030] The nested small cutter disc 2 is fixed on the sub-cutter seat 26, and the sub-cutter seat 26 is connected to the second main drive 52 through the automatic telescopic rod 4; the support mode of the nested small cutter disc 2 is a central support type. The nested small cutter disc 2 can move forward and backward relative to the shield cutter disc body 1 under the action of the automatic telescopic rod 4.

[0031] The shield cutter body 1 includes a plurality of first main arms 11 in a circular array, and the plurality of first main arms 11 are connected by an outer ring reinforcement beam 31 and an inner ring reinforcement beam 32. The first main arms 11 are connected to the outer ring reinforcement beam 31 and the inner ring reinforcement beam 32 by welding to make up for the missing center panel of the shield cutter body 1 to enhance the overall stability and strength.

[0032] The first main arm 11 is in the shape of a fan ring. A plurality of first shield cutters 12 are arranged on the first main arm 11 . One end of the first main arm 11 away from the center is fixed on the large support ring 14 .

[0033] The nested small cutter disc 2 is in the shape of a disc, and includes a central disc and a plurality of second main arms 21 distributed in a circular array on the outer circumference of the central disc. The second main arms 21 are in the shape of a fan ring, and one end of the second main arm 21 away from the center is fixed on a small support ring 25, and a plurality of flushing holes 23 are evenly installed on the outer side of the small support ring 25.

[0034] The flushing assembly is connected to the nested small cutter disc 2, and the flushing assembly includes a flushing hole 23 and a nozzle 24 located on the nested small cutter disc 2, and the flushing hole 23 and the nozzle 24 are both connected to the water pipeline. The water in the water pipeline can be replaced by high-pressure gas or acidic solution. The water pipeline is a steel pipeline, and the other end of the water pipeline is connected to the faucet through a sealed rotating pipe joint.

[0035] The water pipeline is formed by connecting the first water pipeline 243, the second water pipeline 244, the third water pipeline 245 and the fourth water pipeline 246. The water outlet of the first water pipeline 243 is connected to the water inlet of the flushing hole 23 and the nozzle 24. The water pipeline passes through the nested small cutter head 2, the telescopic rod 4 and the center position of the bearing of the second main drive 52 in sequence. The water pipeline is perpendicular to the shield cutter head and is located at the center of the shield cutter head. The second water pipeline 244 is threadedly connected to the first water pipeline 243 and the third water pipeline 245, and the third water pipeline 245 is welded to the fourth water pipeline 246.

[0036] The second water delivery pipeline 244 is a telescopic structure, including an inner layer pipeline 2441 and an outer layer pipeline 2442. The second water delivery pipeline 2444 is located at the center of the telescopic rod. The telescopic rod 4 is welded to the inner layer pipeline 2441 and the outer layer pipeline 2442 at both ends to form a whole. The outer rod of the telescopic rod 4 is welded to the outer layer pipeline 2442, and the inner rod of the telescopic rod is welded to the inner layer pipeline 2441. When the inner rod and the outer rod of the telescopic rod 4 are telescoped, the inner layer pipeline 2441 and the outer layer pipeline 2442 are also telescoped. The diameter of the pipe opening of the inner layer pipeline 2441 is smaller than the diameter of the pipe opening of the outer layer pipeline 2442. A sealing gasket 2443 for anti-seepage lubrication is installed at the tail of the inner layer pipeline 2441 to prevent water leakage.

[0037] The flushing holes 23 are supplied with water by a water pipeline and are kept in a normally open state, so as to flush the soil debris in the gap between the shield cutter head body 1 and the nested small cutter head 2.

[0038] A nozzle 24 is provided on the second main arm 21 of the nested small cutter disc 2, and the nozzle 24 includes a protective shell 241 and a cross rubber sheet 242. The cross rubber sheet 242 in the nozzle 24 and the outlet of the water pipe are both oriented toward the center of the nested small cutter disc 3, and the cross rubber sheet 242 is bolted to the protective shell 241. As the nested small cutter disc 2 rotates, the water flow ejected from the nozzle 24 separates the slag-metal contact surface outside the center of the nested small cutter disc 2, further reducing the generation rate of mud cake.

[0039] A plurality of second shield cutters 22 are arranged on the second main arm 21 of the nested small cutter disc 2 , and the height of the nozzle 24 is lower than the height of the second shield cutters 22 on the nested small cutter disc 2 .

[0040] The first main drive 53 is used to drive the shield cutter head body 1 to rotate, and the second main drive 52 is used to drive the nested small cutter head 2 to rotate. The rotation speeds of the shield cutter head body 1 and the nested small cutter head 2 are different, and the rotation speed of the nested small cutter head 2 is higher than the rotation speed of the shield cutter head body 1.

[0041] An earth pressure bin 63 is formed between the shield cutter body 1, the nested small cutter disc 2, the first main drive 53, and the second main drive 52, and the lower end of the earth pressure bin 63 is connected to the screw conveyor 7. The earth pressure bin 63 is separated from the first main drive 53 and the second main drive 52 by an earth bin partition 62. The cab 61 is located above the first main drive 53, which can provide a working space for the staff to observe and operate the control system of the shield machine to ensure the normal operation of the shield machine.

[0042] The utility model of the nested shield cutter head for resisting mud cake has a first working state and a second working state. When in the first working state, the shield machine excavates and the segment assembly machine stops running, and the thrust jack 51 overcomes the soil pressure to push the shield machine forward. Figure 4As shown, the shield cutter head body 1 and the nested small cutter head 2 are kept flush and rotated to excavate the soil layer, and the cut soil enters the soil pressure bin 63 and is sent out through the screw conveyor 7. When the soil in the soil pressure bin 63 reaches the threshold, the anti-mud cake nested shield cutter head of the present application is switched from the first working state to the second working state, referring to Figure 3 , the shield machine stops excavating and the segment assembling machine starts to operate to assemble the segments. At this time, the shield cutter body 1 stops rotating, and the automatic telescopic rod 4 contracts to drive the nested small cutter disc 2 to move backward and continue to rotate to clean the mud cake in the center of the cutter disc. The automatic telescopic rod 4 moves backward a distance slightly higher than the thickness of the mother cutter seat of the shield cutter body 1. At this time, a relatively sealed space is formed by the soil bin partition 62, the soil in the soil pressure bin 63, the stopped shield cutter body 1 and the continuously rotating nested small cutter disc 2, and the passive soil pressure is balanced with the excavation surface. When the segment assembly is completed, the nested shield cutter disc of the present application is converted from the second working state to the first working state, the shield cutter body 1 starts to rotate, and the automatic telescopic rod 4 extends to drive the nested small cutter disc 2 to move forward and keep it flush with the shield cutter body 1, and the shield machine re-enters the excavation state.

[0043] When the anti-mud cake nested shield cutter head of the present application switches from the first working state to the second working state, the threshold value in the soil pressure bin is a soil pressure value in the soil pressure bin that is squeezed by the backward movement of the nested small cutter head.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are illustrative and cannot be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A nested shield cutterhead with mud cake resistance, characterized in that: include: The shield cutterhead body is in a ring shape and is fixed on a mother cutter seat, which is connected to the first main drive; A nested small cutter disc, wherein the nested small cutter disc is located at the center of the shield cutter disc body, the shield cutter disc body and the nested small cutter disc are independent of each other, and the nested small cutter disc is fixed on a sub-cutter seat, and the sub-cutter seat is connected to the second main drive through an automatic telescopic rod; A flushing assembly is connected to the nested small cutter disc.

2. The anti-mud cake nested shield cutterhead according to claim 1, characterized in that: The shield cutter head body comprises a plurality of first main width arms in a circumferential array, and the plurality of first main width arms are connected by an outer ring reinforcement beam and an inner ring reinforcement beam.

3. The anti-mud cake nested shield cutterhead according to claim 2, characterized in that: The first main arm is in the shape of a fan ring, a plurality of first shield cutters are arranged on the first main arm, and one end of the first main arm away from the center is fixed on the large support ring.

4. The anti-mud cake nested shield cutterhead according to claim 1, characterized in that: There is a gap between the shield cutter disc body and the nested small cutter disc.

5. The anti-mud cake nested shield cutterhead according to claim 1, characterized in that: The nested small cutter disc is in the shape of a disc, and includes a central disc and a plurality of second main arms distributed in a circular array on the outer circumference of the central disc. The second main arms are in the shape of a fan ring, and one end of the second main arm away from the center is fixed on a small support ring, and a plurality of flushing holes are evenly installed on the outer side of the small support ring.

6. The anti-mud cake nested shield cutterhead according to claim 1, characterized in that: The flushing assembly includes a flushing hole and a nozzle located on the nested small cutter disc, and the flushing hole and the nozzle are both connected to a water pipeline, and the water pipeline includes a first water pipeline, a second water pipeline, a third water pipeline and a fourth water pipeline.

7. The anti-mud cake nested shield cutterhead according to claim 5, characterized in that: A nozzle is arranged on the second main arm of the nested small cutter disc, and the nozzle comprises a protective shell and a cross rubber sheet.

8. The anti-mud cake nested shield cutterhead according to claim 7, characterized in that: A plurality of second shield cutters are arranged on the second main arm of the nested small cutter disc, and the height of the nozzle is lower than the height of the second shield cutters on the nested small cutter disc.

9. The anti-mud cake nested shield cutterhead according to claim 1, characterized in that: The rotation speed of the nested small cutter disc is higher than the rotation speed of the shield cutter disc body.

10. The anti-mud cake nested shield cutterhead according to claim 1, characterized in that: The support method of the shield cutter head body is peripheral support, and the support method of the nested small cutter head is central support.

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