An experimental device for the vibration response of shield cutterhead

Abstract

The invention relates to the technical field of shield machines, and discloses an experimental device for the vibration response of a shield cutter disc. The experimental device for the vibration response of a shield cutter disc comprises a soil box, a bracket, a tunnel mold, a cutter disc, a driving member, and a vibration response measurement component. A soil layer is laid in the soil box, and a through hole is opened in the side wall thereof. The bracket is arranged on the outer side of the soil box. The tunnel mold can be movably inserted into the through hole and extended into the soil layer. The outer end of the tunnel mold is arranged on the bracket, and the position on the bracket is adjustable to adjust the inclination angle of the tunnel mold. The cutter disc is rotatably arranged in the tunnel mold and can slide along the tunnel mold. The driving member is connected to the cutter disc in a transmission manner. The vibration response measurement component can measure the vibration response of the cutter disc and the soil layer. The position of the tunnel mold on the bracket is adjustable, so that the vibration response measurement component can measure the vibration response of the cutter disc and the soil layer under different excavation angles, thereby improving the simulation range and simulation effect of the experimental device for the vibration response of the shield cutter disc.

Description

Technical Field

[0001] The invention belongs to the technical field of shield machines, and in particular relates to an experimental device for vibration response of a shield cutter head. Background Art

[0002] The shield machine is used to drive the tunnel by rotating the cutter head of the shield machine to cut the rock and soil of the tunnel excavation surface. The shield method has gradually become one of the main construction methods for underground engineering due to its safety, high efficiency and environmental protection.

[0003] During the tunneling process of the shield machine, the interaction between the cutterhead and the stratum in front will cause significant vibration responses in both the cutterhead and the stratum in front, such as total tunneling thrust, total torque, acceleration of key parts of the cutterhead, acceleration of the stratum in front, etc. The parameters of the vibration response directly affect the tunneling efficiency of the shield construction and the safety of the cutterhead structure.

[0004] At present, model tests are usually used to simulate the shield process to analyze the vibration response of the cutterhead and the vibration response of the formation. Since the excavation angle of the existing experimental models adopts idealized horizontal excavation, and due to the complexity of the formation environment, the shield excavation angle needs to be adjusted in real time. Under different excavation angles, the states of the cutterhead vibration response and the formation vibration response will be quite different, resulting in poor simulation effects of the existing experimental models, and only the cutterhead vibration response and the formation vibration response of a single excavation angle can be obtained. Summary of the invention

[0005] The purpose of the present invention is to provide an experimental device for shield cutter head vibration response, which can measure the cutter head vibration response and stratum vibration response under various excavation angles and improve the simulation range and simulation effect.

[0006] To achieve this purpose, the technical solution adopted by the present invention is:

[0007] An experimental device for the vibration response of a shield cutterhead, comprising:

[0008] A soil box, wherein a soil layer is laid inside the soil box and a through hole is opened on the side wall thereof;

[0009] A bracket, arranged on the outside of the soil box;

[0010] A tunnel mold can be movably inserted into the through hole and extended into the soil layer, wherein the outer end of the tunnel mold is arranged on the bracket and the position on the bracket is adjustable to adjust the inclination angle of the tunnel mold;

[0011] A cutter disc is rotatably disposed in the tunnel mold and is capable of sliding along the tunnel mold;

[0012] A driving member drivingly connected to the cutter disc; and

[0013] The vibration response measurement component is configured to measure the vibration response of the cutterhead and the soil layer.

[0014] Furthermore, the support comprises:

[0015] Support beams; and

[0016] An arc-shaped slide rail is arranged at the top end of the support beam, and the outer end of the tunnel mold can be slidably arranged on the arc-shaped slide rail.

[0017] Furthermore, the support further comprises:

[0018] The locking piece is provided with a plurality of positioning holes along the extending direction of the arc-shaped slide rail, and the locking piece can be selectively inserted into one of the positioning holes and fixedly connected to the tunnel mold.

[0019] Furthermore, the arc-shaped slide rail has an angle indicating line along its extension direction, and the angle indicating line corresponds one-to-one with the corresponding positioning hole.

[0020] Furthermore, the support further comprises:

[0021] A buckle, arranged at the outer end of the tunnel mold;

[0022] The arc-shaped slide rail is provided with a plurality of slots along its extension direction, and the buckle can be selectively engaged with one of the slots.

[0023] Furthermore, the vibration response measurement component includes:

[0024] a torque sensor configured to measure the torque of the cutter head;

[0025] A thrust sensor configured to measure the thrust of the cutter head;

[0026] A first acceleration sensor configured to measure the acceleration of the cutter head; and

[0027] The second acceleration sensor is configured to measure its acceleration at the location of the soil layer.

[0028] Furthermore, the experimental device for the vibration response of the shield cutter head also includes:

[0029] The protective sleeve is sleeved on the tunnel mould and is sealingly clamped between the through hole and the tunnel mould.

[0030] Furthermore, the soil box is a transparent box.

[0031] Furthermore, the experimental device for the vibration response of the shield cutter head also includes:

[0032] A base, the soil box and the bracket are both arranged on the base.

[0033] The beneficial effects of the present invention are:

[0034] The experimental device for the vibration response of the shield cutter disc proposed by the present invention has a soil layer laid in a soil box to simulate the shield environment. The tunnel mold extends into the soil box, and a cutter disc is arranged at the end extending into the soil box. The driving member can drive the cutter disc to rotate and slide along the tunnel mold to simulate the excavation operation. Since the position of the tunnel mold on the bracket is adjustable, the inclination angle of the tunnel mold is adjustable, so that the cutter disc has different excavation angles. The vibration response measurement component can measure the vibration response of the cutter disc and the soil layer at different excavation angles, which improves the simulation range and simulation effect of the experimental device for the vibration response of the shield cutter disc, and is conducive to improving the accuracy of the vibration response measurement of the cutter disc and the soil layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is an end view of an experimental device for the vibration response of a shield cutter head provided in an embodiment of the present invention;

[0036] Figure 2 It is a top view of an experimental device for the vibration response of a shield cutter head provided in an embodiment of the present invention.

[0037] The names and numbers of the components in the figure are as follows:

[0038] 1. Soil box; 2. Bracket; 21. Support beam; 22. Arc slide rail; 3. Tunnel mold; 31. Cylinder; 32. Mounting plate; 33. Screw hole block; 4. Cutter head; 41. Cutter head body; 42. Connecting rod; 5. Driving member; 51. Screw rod; 6. Locking member; 7. Torque sensor; 8. First acceleration sensor; 9. Protective cover; 10. Base. DETAILED DESCRIPTION

[0039] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0040] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0042] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0043] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0044] At present, the shield tunneling process is usually simulated by model test to analyze the vibration response of the cutterhead 4 and the stratum. Since the excavation angle of the existing experimental model adopts idealized horizontal excavation, and due to the complexity of the stratum environment, the shield tunneling angle needs to be adjusted in real time. Under different excavation angles, the vibration response of the cutterhead 4 and the stratum will be quite different. The existing experimental model can only simulate and obtain the vibration response of the cutterhead 4 and the stratum under a single excavation angle, and the effect is poor.

[0045] To solve the above problems, Figure 1 As shown, this embodiment discloses an experimental device for the vibration response of a shield cutter head to simulate the shield process at different excavation angles, thereby measuring the vibration response of the cutter head 4 and the soil layer at different excavation angles.

[0046] Specifically, the experimental device for the vibration response of the shield cutterhead includes a soil box 1, a bracket 2, a tunnel mold 3, a cutterhead 4, a driving member 5 and a vibration response measurement assembly. A soil layer is laid in the soil box 1, and a through hole is opened in its side wall. The bracket 2 is arranged on the outside of the soil box 1. The tunnel mold 3 is movably inserted into the through hole and extends into the soil layer. The outer end of the tunnel mold 3 is arranged on the bracket 2, and the position on the bracket 2 is adjustable to adjust the inclination angle of the tunnel mold 3. The cutterhead 4 is rotatably arranged in the tunnel mold 3 and can slide along the tunnel mold 3. The driving member 5 is connected to the cutterhead 4 in a transmission manner. When the cutterhead 4 rotates, the vibration response measurement assembly can measure the vibration response of the cutterhead 4 and the soil layer at different excavation angles.

[0047] In this embodiment, a soil layer is laid in the soil box 1 to simulate the shield environment. The tunnel mold 3 extends into the soil box 1, and a cutterhead 4 is provided at the end extending into the soil box 1. The driving member 5 can drive the cutterhead 4 to rotate and slide along the tunnel mold 3 to simulate the excavation operation. Since the position of the tunnel mold 3 on the bracket 2 is adjustable, the inclination angle of the tunnel mold 3 is adjustable, so that the cutterhead 4 has different excavation angles. The vibration response measurement component can measure the vibration response of the cutterhead 4 and the soil layer at different excavation angles, which improves the simulation range and simulation effect of the experimental device for the vibration response of the shield cutterhead, and is conducive to improving the accuracy of the vibration response measurement of the cutterhead 4 and the soil layer.

[0048] like Figure 1 and Figure 2 As shown, the experimental device for the vibration response of the shield cutter head also includes a base 10, and the soil box 1 and the bracket 2 are both arranged on the base 10. The projection of the soil box 1 in the vertical direction all falls on the base 10, that is, the length and width of the base 10 are respectively greater than the length and width of the soil box 1. When the cutter head 4 is excavating, the soil overflowing from the soil box 1 all falls on the base 10, which is convenient for collection and sorting, and avoids affecting the environment around the experimental device for the vibration response of the shield cutter head.

[0049] The soil box 1 of this embodiment is a transparent box, which is convenient for operators to visually observe the vibration and deformation of the soil layer in the soil box 1 during excavation.

[0050] Specifically, the soil box 1 is made of organic glass, which is easy to process and has low cost. The top of the soil box 1 is open to facilitate laying of soil layers and placement of vibration response measurement components.

[0051] like Figure 1 and Figure 2As shown, the tunnel mold 3 includes a cylinder 31, a mounting plate 32 and a screw hole block 33. The cylinder 31 is a cylindrical structure to simulate the tunnel created by the excavation of the cutter head 4. The mounting plate 32 is located in the cylinder 31 and is integrally formed with the cylinder 31. A through hole is provided on the mounting plate 32, and the screw hole block 33 has a threaded hole that penetrates the screw hole block 33. The screw hole block 33 is fixedly mounted on the mounting plate 32 by bolts, and the through hole and the threaded hole are coaxially arranged.

[0052] The cutterhead 4 of this embodiment includes a cutterhead body 41 and a connecting rod 42, one end of which is fixedly connected to the center of the cutterhead body 41. The driving member 5 is a variable frequency speed regulating motor, which has the advantages of high transmission efficiency, low noise and good reliability, and can accurately control and adjust the rotation speed of the cutterhead 4. The output shaft of the variable frequency speed regulating motor is connected to the screw 51, and the screw 51 passes through the through hole and the threaded hole in turn, and is connected to the connecting rod 42 through a flange structure. Through the threaded connection between the screw 51 and the screw hole block 33, the driving member 5 can drive the cutterhead body 41 to rotate along the barrel 31 of the tunnel mold 3, and can also dig forward, thereby truly simulating the shield process.

[0053] Continue as Figure 1 and Figure 2 As shown, the experimental device for the vibration response of the shield cutter head also includes a protective cover 9. The protective cover 9 is sleeved on the tunnel mold 3, and the sealing clamp is arranged between the through hole and the tunnel mold 3. When the tunnel mold 3 adjusts the angle, the protective cover 9 avoids excessive wear between the tunnel mold 3 and the soil box 1, and plays a protective role.

[0054] Specifically, the protective sleeve 9 is a rubber sleeve with good elasticity. When the tunnel mold 3 is excavated in the horizontal direction, the excavation angle is zero, and the gap between the tunnel mold 3 and the through hole of the soil box 1 is the largest. When the tunnel mold 3 is excavated in the inclined direction, the excavation angle is not zero, and the gap between the tunnel mold 3 and the through hole of the soil box 1 will become smaller. It can be understood that the larger the absolute value of the excavation angle, the smaller the gap between the tunnel mold 3 and the through hole of the soil box 1. Therefore, the elastic rubber sleeve can adapt to the change in the gap between the tunnel mold 3 and the through hole of the soil box 1 when the tunnel mold 3 adjusts its angle, so that a good seal is maintained between the tunnel mold 3 and the soil box 1.

[0055] During the actual measurement process, applying a proper amount of vaseline between the protective cover 9 and the tunnel mold 3 can achieve a good sealing effect, and can further prevent the soil in the soil box 1 from overflowing from the through hole, the protective cover 9 and the tunnel mold 3.

[0056] It should be noted that the vibration response of the cutterhead 4 includes the total thrust and torque of the cutterhead 4 and the acceleration response of the cutterhead 4, and the vibration response of the formation includes the acceleration response in the formation ahead of the excavation and on the surface.

[0057] The vibration response measurement assembly of this embodiment includes a torque sensor 7, a thrust sensor, a first acceleration sensor 8 and a second acceleration sensor. The torque sensor 7 is arranged on the screw rod 51 to measure the torque of the cutter head 4. The thrust sensor is arranged inside the connecting rod 42 to measure the thrust of the cutter head 4. The first acceleration sensor 8 is arranged on the cutter head body 41 to measure the acceleration of the cutter head 4. The second acceleration sensor is placed in the soil layer to measure its acceleration at the soil layer position.

[0058] Specifically, the thrust sensor is a fiber Bragg grating sensor, which can accurately measure the total thrust of the cutterhead 4. There are multiple second acceleration sensors, at least one second acceleration sensor is installed in front of the end of the tunnel mold 3 in the soil layer, and at least one second acceleration sensor is installed on the surface of the soil layer.

[0059] In order to accurately measure the acceleration of the cutter disc 4 , the first acceleration sensor 8 is arranged at a location where stress is concentrated on the cutter disc body 41 .

[0060] It should be noted that the connecting rod 42 of the cutter head 4 of this embodiment is detachably connected to the screw rod 51 through a bolt. Therefore, a cutter head 4 with different opening ratios can be selected according to measurement requirements to increase the measurement range.

[0061] Now combined Figure 1 and Figure 2 The structure of the bracket 2 is described. Figure 1 and Figure 2 As shown, the bracket 2 includes a support beam 21 and an arc-shaped slide rail 22. The bottom end of the support beam 21 is fixedly arranged on the base 10, the arc-shaped slide rail 22 is arranged on the top end of the support beam 21, and the outer end of the tunnel mold 3 is slidably arranged on the arc-shaped slide rail 22 to adjust the inclination angle of the tunnel mold 3.

[0062] Specifically, a slide groove is provided on the side of the arc-shaped slide rail 22 facing the soil box 1, and a sliding part is provided at the outer end of the tunnel mold 3. Through the sliding cooperation between the sliding part and the slide groove, the position of the tunnel mold 3 on the arc-shaped slide rail 22 can be quickly adjusted.

[0063] In the present embodiment, there are two brackets 2, which are spaced apart along the width direction of the base 10. The outer end of the tunnel mold 3 has two sliding parts correspondingly, and the two sliding parts are respectively slidably arranged in the corresponding sliding grooves, which improves the connection strength and stability between the tunnel mold 3 and the bracket 2, and is conducive to improving the accuracy of adjusting the angle of the tunnel mold 3.

[0064] like Figure 2As shown, the bracket 2 further includes a locking member 6, and the arc-shaped slide rail 22 is provided with a plurality of positioning holes along its extension direction, and the locking member 6 can be selectively inserted into one of the positioning holes and fixedly connected to the tunnel mold 3. The locking member 6 of this embodiment is a bolt, and the locking member 6 is threadedly connected to the sliding part of the tunnel mold 3, so that the connection strength between the arc-shaped slide rail 22 and the tunnel mold 3 is high, and the stability and adjustment efficiency of the tunnel mold 3 on the arc-shaped slide rail 22 are improved.

[0065] Specifically, a positioning hole is provided at the center of the arc-shaped slide rail 22. When the locking member 6 is inserted into the positioning hole and is threadedly connected to the sliding portion of the tunnel mold 3, the inclination angle of the tunnel mold 3 is 0°, and the cutterhead 4 excavates in the horizontal direction, that is, the excavation angle is 0°. Taking the center of the arc-shaped slide rail 22 as the base point, a plurality of positioning holes are provided at equal intervals on the left and right sides along the extension direction of the arc-shaped slide rail 22, so that the inclination angle (excavation angle) of the tunnel mold 3 can be adjusted in the forward and reverse directions.

[0066] In order to adjust the excavation angle of the cutter head 4 more intuitively and conveniently, the arc-shaped slide rail 22 of this embodiment has an angle indicator line along its extension direction, and the angle indicator line corresponds to the corresponding positioning hole one by one. The indication range of the angle indicator line of this embodiment is -15° to 15°. Of course, the indication range of the angle indicator line can also be adaptively adjusted according to the test requirements, which is not specifically limited here.

[0067] In other embodiments, the bracket 2 further includes a buckle, which is arranged at the outer end of the tunnel mold 3. The arc-shaped slide rail 22 is provided with a plurality of slots along its extension direction, and the buckle can be selectively engaged with one of the slots. The position adjustment of the tunnel mold 3 on the arc-shaped slide rail 22 can be quickly achieved through the engagement of the buckle with the slot, which is easy to operate and improves the adjustment efficiency of the excavation angle.

[0068] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. An experimental device for the vibration response of a shield cutterhead, characterized in that: include: A soil box (1), wherein a soil layer is laid inside the soil box (1) and a through hole is opened on the side wall thereof; A bracket (2) is arranged outside the soil box (1); A tunnel mold (3) is movably arranged in the through hole and extends into the soil layer. The outer end of the tunnel mold (3) is arranged on the support (2), and the position on the support (2) is adjustable to adjust the inclination angle of the tunnel mold (3); A cutter disc (4) is rotatably disposed in the tunnel mold (3) and is capable of sliding along the tunnel mold (3); a connecting rod (42) of the cutter disc (4) is detachably connected to a screw rod (51) via a bolt; A driving member (5) is drivingly connected to the cutter disc (4); and A vibration response measurement component configured to measure the vibration response of the cutterhead (4) and the soil layer; The support (2) comprises: a support beam (21); and An arc-shaped slide rail (22) is arranged at the top end of the support beam (21), and the outer end of the tunnel mold (3) can be slidably arranged on the arc-shaped slide rail (22); the arc-shaped slide rail (22) is provided with a slide groove on the side facing the soil box (1), and the outer end of the tunnel mold (3) is provided with a sliding part, and the position of the tunnel mold (3) on the arc-shaped slide rail (22) can be quickly adjusted through the sliding cooperation between the sliding part and the slide groove; The support (2) further comprises: A locking member (6), wherein the arc-shaped slide rail (22) is provided with a plurality of positioning holes along its extension direction, and the locking member (6) can be selectively inserted into one of the positioning holes and fixedly connected to the tunnel mold (3).

2. The experimental device for the vibration response of the shield cutterhead according to claim 1 is characterized in that: The arc-shaped slide rail (22) has an angle indicating line along its extension direction, and the angle indicating line corresponds one-to-one with the corresponding positioning hole.

3. The experimental device for the vibration response of the shield cutterhead according to claim 1 is characterized in that: The support (2) further comprises: A buckle, arranged at the outer end of the tunnel mold (3); The arc-shaped slide rail (22) is provided with a plurality of slots along its extension direction, and the buckle can be selectively engaged with one of the slots.

4. The experimental device for the vibration response of the shield cutterhead according to claim 1 is characterized in that: The vibration response measurement assembly comprises: A torque sensor (7) configured to measure the torque of the cutter head (4); A thrust sensor configured to measure the thrust of the cutter disc (4); A first acceleration sensor (8) configured to measure the acceleration of the cutter head (4); and The second acceleration sensor is configured to measure its acceleration at the location of the soil layer.

5. The experimental device for the vibration response of the shield cutterhead according to claim 1 is characterized in that: The experimental device for the shield cutterhead vibration response also includes: A protective sleeve (9) is sleeved on the tunnel mould (3) and is sealingly clamped between the through hole and the tunnel mould (3).

6. The experimental device for the vibration response of the shield cutterhead according to claim 1 is characterized in that: The soil box (1) is a transparent box.

7. The experimental device for the vibration response of the shield cutterhead according to claim 1 is characterized in that: The experimental device for the shield cutterhead vibration response also includes: A base (10), the soil box (1) and the bracket (2) are both arranged on the base (10).

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