A shield scraper using active control of magnetorheological elastomer

Abstract

The present invention discloses a shield scraper which is actively controlled by a magnetorheological elastomer, comprising: a blade body and a blade seat, wherein a plurality of cutting edges are arranged on the top of the blade body, a cavity is arranged in the cutting edge, the cavity is filled with a magnetorheological elastomer, and an electromagnetic coil is wound around the outside of the magnetorheological elastomer; a T-shaped protrusion composed of a horizontal protrusion and a vertical protrusion is arranged on one side of the blade body, a mounting groove which is matched with the vertical protrusion is arranged on the front side of the blade seat, and a welding position is arranged on the back side of the blade seat; a pressure sensor is arranged in the horizontal protrusion, and a power supply and a controller are arranged in the vertical protrusion, the pressure sensor collects a pressure signal and sends it to the controller, and when the pressure value exceeds a threshold value, the controller controls the power supply to supply power to the electromagnetic coil to apply a magnetic field to the magnetorheological elastomer to change the stiffness of the cutting edge.

Description

Technical Field

[0001] The invention belongs to the field of shield machine design and relates to a shield scraper actively controlled by a magnetorheological elastomer. Background Art

[0002] The shield scraper is an indispensable and important part of the tools used in the shield machine. It is arranged on both sides of the cutter disc opening slot. As the shield moves forward, the scraper rotates with the cutter disc to generate axial shear force and radial cutting force on the soil on the excavation surface. Under the rotation of the cutter disc, the blade and the cutter head are inserted into the stratum, continuously cutting off the soil in front of the excavation surface.

[0003] When the shield machine is constructing in a composite stratum, the existing shield scraper is subjected to a large impact load during use, which can easily cause damage to the cutter. In severe cases, it can cause damage to other cutters and equipment, thus causing a significant impact on the safety of the shield construction equipment and the excavation efficiency. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of the present invention is to provide a shield scraper actively controlled by magnetorheological elastomer, which can increase the stiffness of the tool when the shield machine passes through the rock formation, and can effectively prevent the tool from falling off, reduce the wear of the tool, and increase its service life.

[0005] The present invention provides a shield scraper actively controlled by a magnetorheological elastomer, comprising: a blade body and a blade seat, wherein a plurality of cutting edges are arranged on the top of the blade body, a cavity is arranged in the cutting edge, the cavity is filled with a magnetorheological elastomer, and an electromagnetic coil is wound around the outside of the magnetorheological elastomer; a T-shaped protrusion composed of a horizontal protrusion and a vertical protrusion is arranged on one side of the blade body, a mounting groove for matching with the vertical protrusion is arranged on the front side of the blade seat, and a welding clamping position is arranged on the back side of the blade seat;

[0006] A pressure sensor is provided in the horizontal protrusion, and a power supply and a controller are provided in the vertical protrusion. The pressure sensor collects a pressure signal and sends it to the controller. When the pressure value exceeds a threshold, the controller controls the power supply to supply power to the electromagnetic coil to apply a magnetic field to the magnetorheological elastomer to change the stiffness of the cutting edge.

[0007] In the shield scraper actively controlled by magnetorheological elastomer of the present invention, grooves are respectively provided in the middle positions of the two side surfaces of the vertical protrusion, and a first pin hole penetrating the groove of the vertical protrusion is provided on the top of the horizontal protrusion; a protrusion cooperating with the groove is provided in the mounting groove of the tool holder, and a second pin hole is provided on the protrusion, and the T-shaped protrusion is inserted into the mounting groove, and the longitudinal connection between the tool body and the tool holder is realized by inserting the pin into the first pin hole and the second pin hole.

[0008] In the shield scraper actively controlled by magnetorheological elastomer of the present invention, a first bolt hole is provided on the blade body below the horizontal protrusion and on the vertical protrusion, and a second bolt hole is provided at the corresponding position of the blade seat. The T-shaped protrusion is inserted into the installation groove, and the blade body and the blade seat are horizontally connected by inserting bolts into the first bolt hole and the second bolt hole.

[0009] In the shield scraper actively controlled by magnetorheological elastomer of the present invention, the material of the blade body is 42CrMo.

[0010] In the shield scraper actively controlled by magnetorheological elastomer of the present invention, the material of the cutting edge is cemented carbide.

[0011] In the shield scraper actively controlled by magnetorheological elastomer of the present invention, the material of the blade seat is 20Cr.

[0012] The shield scraper actively controlled by magnetorheological elastomer of the present invention has at least the following advantages and beneficial effects:

[0013] (1) The tool can detect the size of the pressure on the blade. When the pressure is large, the controller can control the power supply to the coil outside the elastic body, thereby increasing the strength of the blade and adapting to different geological conditions.

[0014] (2) The cutter is provided with a vertical pin connection, which can provide a tensile force several times greater than that of a bolt connection, thereby improving the impact resistance of the scraper;

[0015] (3) The tool is not only equipped with bolts in the horizontal direction, but also with pins in the vertical direction, which effectively prevents the tool from falling off;

[0016] (4) The tool adopts magnetorheological elastomer to absorb and reduce noise.

[0017] (5) The tool has the advantages of simple structure, good stability and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of a blade body of a shield scraper actively controlled by a magnetorheological elastomer according to the present invention;

[0019] Figure 2 It is a structural schematic diagram of a blade holder of a shield scraper actively controlled by a magnetorheological elastomer according to the present invention;

[0020] Figure 3 It is a cross-sectional view of a shield scraper actively controlled by a magnetorheological elastomer according to the present invention;

[0021] Figure 4 The present invention is a power supply block diagram of an electromagnetic coil of a shield scraper actively controlled by a magnetorheological elastomer. DETAILED DESCRIPTION

[0022] like Figure 1 and Figure 2 As shown, a shield scraper using active control of magnetorheological elastomer of the present invention comprises: a blade body 1 and a blade seat 2, wherein the top of the blade body 1 is provided with a plurality of cutting edges 3, the cutting edges 3 are provided with a cavity, the cavity is filled with magnetorheological elastomer 4, and an electromagnetic coil 5 is wound around the outside of the magnetorheological elastomer 4. A T-shaped protrusion consisting of a horizontal protrusion 6 and a vertical protrusion 7 is provided on one side of the blade body 1, a mounting groove 8 for matching with the vertical protrusion 7 is provided on the front of the blade seat 2, and a welding clamping position is provided on the back of the blade seat 2.

[0023] A pressure sensor 9 is provided in the horizontal protrusion 6, and a power supply 10 and a controller 12 are provided in the vertical protrusion 7. The pressure sensor 9 collects a pressure signal and sends it to the controller 12. When the pressure value exceeds a threshold, the controller 12 controls the power supply 10 to supply power to the electromagnetic coil 5, so as to apply a magnetic field to the magnetorheological elastomer 4 and change the stiffness of the cutting edge 3.

[0024] like Figure 1-3 As shown, grooves 71 are respectively provided in the middle positions of the two side surfaces of the vertical protrusion 7, and a first pin hole 61 penetrating the groove 71 of the vertical protrusion 7 is provided on the top of the horizontal protrusion 6; a protrusion 81 cooperating with the groove 71 is provided in the mounting groove 8 of the knife seat 2, and a second pin hole 82 is provided on the protrusion 81. The T-shaped protrusion is inserted into the mounting groove 8, and the longitudinal connection between the knife body 1 and the knife seat 2 is realized by inserting the pin into the first pin hole 61 and the second pin hole 82.

[0025] A first bolt hole 11 is provided on the blade body below the horizontal protrusion 6 and on the vertical protrusion 7, and a second bolt hole 21 is provided at a corresponding position of the blade holder 2. The T-shaped protrusion is inserted into the mounting groove 8, and the blade body 1 and the blade holder 2 are horizontally connected by inserting bolts into the first bolt hole 11 and the second bolt hole 21.

[0026] In a specific implementation, the material of the tool body is 42CrMo, the material of the cutting edge is cemented carbide, and the material of the tool holder is 20Cr.

[0027] The above description is only a preferred embodiment of the present invention and is not intended to limit the concept of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A shield scraper actively controlled by magnetorheological elastomer, characterized in that: include: A knife body and a knife seat, wherein the top of the knife body is provided with a plurality of cutting edges, a cavity is provided in the cutting edges, the cavity is filled with a magnetorheological elastomer, and an electromagnetic coil is wound around the outside of the magnetorheological elastomer; a T-shaped protrusion consisting of a horizontal protrusion and a vertical protrusion is provided on one side of the knife body, a mounting groove for matching with the vertical protrusion is provided on the front of the knife seat, and a welding position is provided on the back of the knife seat; A pressure sensor is provided in the horizontal protrusion, and a power supply and a controller are provided in the vertical protrusion. The pressure sensor collects a pressure signal and sends it to the controller. When the pressure value exceeds a threshold, the controller controls the power supply to supply power to the electromagnetic coil to apply a magnetic field to the magnetorheological elastomer to change the stiffness of the cutting edge. Grooves are respectively provided at the middle positions of the two side surfaces of the vertical protrusion, and a first pin hole penetrating the groove of the vertical protrusion is provided at the top of the horizontal protrusion; a convex block matching the groove is provided in the installation groove of the knife seat, and a second pin hole is provided on the convex block, and the T-shaped protrusion is inserted into the installation groove, and the knife body and the knife seat are longitudinally connected by inserting the pin into the first pin hole and the second pin hole; The material of the cutter body is 42CrMo.

2. The shield scraper using active control of magnetorheological elastomer as claimed in claim 1, characterized in that: A first bolt hole is provided on the knife body below the horizontal protrusion and on the vertical protrusion, and a second bolt hole is provided at a corresponding position of the knife seat. The T-shaped protrusion is inserted into the installation groove, and the knife body and the knife seat are horizontally connected by inserting bolts into the first bolt hole and the second bolt hole.

3. The shield scraper using active control of magnetorheological elastomer as claimed in claim 1, characterized in that: The material of the cutting edge is hard alloy.

4. The shield scraper using active control of magnetorheological elastomer as claimed in claim 1, characterized in that: The material of the knife seat is 20Cr.

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