A shield machine cutter head anti-mud cake cutter

Abstract

The present invention discloses a shield machine cutterhead anti-mud cake tool, comprising a cutterhead and a disc-shaped hob; the disc-shaped hob is arranged on the cutterhead, and the disc-shaped hob comprises two blades and two brackets, the two blades are both funnel-shaped and symmetrically combined together, and the outer side surface of each blade is provided with an eccentric support, and the eccentric support is arranged offset from the center of the blade; the two brackets are respectively located on the outer sides of the two blades, and each bracket comprises a fixed center rod, a fixed oblique rod, a movable center rod and a movable oblique rod. By providing the disc-shaped hob, the disc-shaped hob can be split into two identical blades. When the shield machine is operating normally, the two blades are tightly fixed and rotate together with the center of the cutter as the center of the circle under the support of the movable center rod. When breaking the mud cake, the two blades rotate relative to each other with the eccentric support as the center of the circle, so that the mud cake attached to the cutter falls off, thereby achieving the purpose of preventing the cutterhead from forming mud cake.

Description

Technical Field

[0001] The invention relates to the technology of shield construction field, in particular to a shield machine cutter head anti-mud cake cutter. Background Art

[0002] Mud cake formation on the shield cutterhead is a common problem encountered when tunneling through cohesive strata such as weathered mudstone, argillaceous siltstone, argillaceous sandstone, silt, silty soil, and silty clay. This occurs when the debris removed by the cutterhead becomes trapped between the cutterhead and the shield excavation face during tunneling. The extrusion of the shield machine transforms the debris into solid or semi-solid blocks that adhere to the cutterhead. When mud cake forms on the shield cutterhead, the cutting tools gradually become encrusted with the solid clay, reducing penetration. When the cutting tools are completely covered in mud cake, the cutterhead becomes a blunt cylinder, completely losing its cutting capability. This significantly reduces the controllability of tunneling risks and poses a significant threat to equipment safety.

[0003] Currently, there are several ways to prevent the cutter disc from forming mud cakes:

[0004] 1. Slag improvement: In engineering projects, the amount of foaming agent injected is often increased to achieve the purpose of removing mud cakes. However, increasing the amount of foam injection will not only increase costs, but also increase environmental pollution.

[0005] 2. Manually entering the front of the cutterhead for cleaning: The workers are very labor-intensive and risky, and they also face the risk of face collapse.

[0006] Therefore, it is necessary to study a solution to solve the above problems. Summary of the Invention

[0007] In view of this, the present invention aims to address the deficiencies in the prior art, and its main purpose is to provide a shield machine cutter head anti-mud cake tool, which does not pollute the soil and does not require manual entry into the warehouse to clean the mud cake as much as possible.

[0008] To achieve the above object, the present invention adopts the following technical solutions:

[0009] A shield machine cutter disc anti-mud cake tool includes a cutter disc and a disc-shaped hob; the disc-shaped hob is arranged on the cutter disc, and the disc-shaped hob includes two blades and two brackets, the two blades are funnel-shaped and symmetrically combined together, and the outer side surface of each blade is provided with an eccentric support, and the eccentric support is arranged offset from the center of the blade; the two brackets are respectively located on the outside of the two blades, and each bracket includes a fixed center rod, a fixed oblique rod, a movable center rod and a movable oblique rod, the fixed center rod extends horizontally, the fixed oblique rod extends obliquely and is fixed on the fixed center rod, the movable center rod is telescopically arranged on the fixed center rod, the outer end face of the movable center rod abuts against the center end face of the blade, the movable oblique rod is telescopically arranged on the fixed oblique rod, and the outer end of the movable oblique rod is provided with a positioner that cooperates with the eccentric support.

[0010] Preferably, there are multiple disc-shaped cutters, which are arranged in two rows longitudinally and transversely.

[0011] Preferably, the cutter disc is further provided with a cutter, which is located beside the disc-shaped hob.

[0012] Preferably, a monitoring device is provided on the cutter disc.

[0013] Preferably, the eccentric support extends outward integrally from the outer side surface of the blade.

[0014] Preferably, the fixed central rod and the fixed oblique rod are integrally formed and connected together.

[0015] Preferably, the movable central rod is located inside the fixed central rod, and the movable central rod and the fixed central rod are coaxially arranged.

[0016] Preferably, the movable oblique rod is located inside the fixed oblique rod, and the movable oblique rod and the fixed oblique rod are coaxially arranged.

[0017] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical solution that:

[0018] By setting up a disc cutter, the disc cutter can be split into two identical blades. When the shield machine is operating normally, the two blades are tightly fixed and rotate together with the center of the cutter as the center of the circle under the support of the movable center rod. When breaking the mud cake, they rotate relative to each other with the eccentric support as the center of the circle, so that the mud cake attached to the cutter falls off, thereby preventing the cutter disc from forming mud cake. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view of a preferred embodiment of the present invention;

[0020] Figure 2 This is a front view of the disc cutter in the preferred embodiment of the present invention in the working state;

[0021] Figure 3 This is a front view of the mud cake breaking state in a preferred embodiment of the present invention;

[0022] Figure 4 It is a three-dimensional diagram of the mud cake breaking state in a preferred embodiment of the present invention.

[0023] Description of the accompanying drawings:

[0024] 10. Cutterhead 20. Disc cutter

[0025] 21. Blade 22. Bracket

[0026] 221, fixed center rod 222, fixed diagonal rod

[0027] 223. Movable center rod 224. Movable diagonal rod

[0028] 201, eccentric support 202, positioner

[0029] 30. Cutter 40. Monitoring device DETAILED DESCRIPTION

[0030] Please refer to Figures 1 to 4 As shown, it shows the specific structure of a preferred embodiment of the present invention, including a cutter head 10 and a disc-shaped hob 20.

[0031] The cutter disc 10 is disc-shaped. The disc-shaped hob 20 is arranged on the cutter disc 10 and includes two blades 21 and two brackets 22. The two blades 21 are funnel-shaped and symmetrically assembled together. The outer side of each blade 21 is provided with an eccentric support 201, and the eccentric support 201 is arranged away from the center of the blade 21; the two brackets 22 are respectively located on the outer sides of the two blades 21, and each bracket 22 includes a fixed center rod 221, a fixed oblique rod 222, a movable center rod 223 and a movable oblique rod 224. The fixed center rod 221 Extending horizontally, the fixed oblique rod 222 extends obliquely and is fixed on the fixed center rod 221, the movable center rod 223 is telescopically arranged on the fixed center rod 221, and the outer end face of the movable center rod 223 abuts against the center end face of the blade 21, and the movable oblique rod 224 is telescopically arranged on the fixed oblique rod 222. The outer end of the movable oblique rod 224 is provided with a positioner 202 that cooperates with the eccentric support 201 to ensure that the movable oblique rod 224 and the eccentric support 201 are in the same straight line when the disc cutter 20 idles.

[0032] In this embodiment, the eccentric support 201 extends outward as a whole from the outer side surface of the blade 21, the fixed center rod 221 and the fixed oblique rod 222 are integrally formed and connected together, the movable center rod 223 is located in the fixed center rod 221, and the movable center rod 223 is coaxially arranged with the fixed center rod 221, and the movable oblique rod 224 is located in the fixed oblique rod 222, and the movable oblique rod 224 is coaxially arranged with the fixed oblique rod 222.

[0033] In addition, there are multiple disc cutters 20, which are arranged in two rows longitudinally and transversely; the cutter head 10 is also provided with a cutter 30, which is located on the side of the disc cutter 20; the cutter head 10 is provided with a monitoring device 40, which is protected by rigid material and will not be damaged by the soil on the tunnel face when the cutter head 10 rotates. The monitoring device 40 is used to monitor whether mud cakes are formed on the disc cutters 20.

[0034] The working principle of this embodiment is described in detail as follows:

[0035] When the shield machine is in operation, the two blades 21 are in a retracted state by the movable central rod 223 on both sides and the movable oblique rods 224 on both sides. At this time, the two blades 21 rotate with the tool center as the origin to cut the soil on the tunnel face.

[0036] When the monitoring device 40 arranged on the cutter head 10 detects that mud cakes are generated on the surfaces of the two blades 21, the shield cutter head stops running and retreats a distance in the opposite direction of the excavation direction; the shield machine stops excavating, and the disc cutter 20 idles at this time until the positioner 202 installed on the movable inclined rod 224 detects that the movable inclined rod 224 and the eccentric supports 201 on the two blades 21 are in the same straight line, and the disc cutter 20 stops idling; the movable inclined rod 224 extends and is connected and fixed with the eccentric supports 201 on the two blades 21, the movable center rod 223 is retracted, and the two blades 21 rotate relative to each other with the eccentric support 201 as the center, so that the mud cakes attached to the blades 21 fall off, thereby preventing the cutter head from forming mud cakes.

[0037] The distance that the shield machine cutterhead retreats in the opposite direction of the excavation direction is the maximum height of the blade 21 from the cutterhead surface when the two blades 21 rotate relative to each other. The cutters of the present invention can be arranged as much as possible at the center of the cutterhead according to actual engineering needs to solve the serious problem of mud cake at the center of the cutterhead. It can also work together with the high-pressure water flushing device on the cutterhead to more efficiently solve the problem of mud cake on the cutterhead.

[0038] The design focus of the present invention is: by setting a disc-shaped hob, the disc-shaped hob can be split into two identical blades. When the shield machine is operating normally, the two blades are tightly fixed and rotate together with the center of the cutter as the center of the circle under the support of the movable center rod. When breaking the mud cake, they rotate relative to each other with the eccentric support as the center of the circle, so that the mud cake attached to the cutter falls off, thereby achieving the purpose of preventing the cutter disc from forming mud cake.

[0039] The technical principles of the present invention have been described above with reference to specific embodiments. These descriptions are intended solely to illustrate the principles of the present invention and are not to be construed in any way as limiting the scope of protection of the present invention. Based on the explanations herein, those skilled in the art will readily conceive of other specific embodiments of the present invention without inventive effort, and such embodiments will fall within the scope of protection of the present invention.

Claims

1. A shield machine cutter head anti-mud cake cutter, characterized by: The cam is provided with a plurality of support brackets, each of which is provided with an eccentric support, and the eccentric support is arranged away from the center of the blade; the two brackets are respectively located on the outside of the two blades, and each bracket includes a fixed center rod, a fixed oblique rod, a movable center rod and a movable oblique rod. The fixed center rod extends horizontally, the fixed oblique rod extends obliquely and is fixed on the fixed center rod. The movable center rod is telescopically arranged on the fixed center rod, and the outer end face of the movable center rod abuts the center end face of the blade. The movable oblique rod is telescopically arranged on the fixed oblique rod, and the outer end of the movable oblique rod is provided with a positioner cooperating with the eccentric support, the eccentric support extends outward as a whole on the outer side face of the blade, the fixed center rod and the fixed oblique rod are integrally formed and connected together, the movable center rod is located in the fixed center rod, and the movable center rod is coaxially arranged with the fixed center rod.

2. The shield machine cutter head anti-mud cake cutter according to claim 1, characterized in that: There are multiple disc-shaped hobs, which are arranged in two rows longitudinally and transversely.

3. The shield machine cutter head anti-mud cake cutter according to claim 1, characterized in that: The cutter disc is also provided with a cutter, which is located beside the disc-shaped hob.

4. The shield machine cutter head anti-mud cake cutter according to claim 1, characterized in that: A monitoring device is provided on the cutter head.

5. The shield machine cutter head anti-mud cake cutter according to claim 1, characterized in that: The movable oblique rod is located inside the fixed oblique rod, and the movable oblique rod and the fixed oblique rod are coaxially arranged.

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