A dynamic detection device and method for shield scraper weld strength

Abstract

The application provides a shield scraper weld joint strength dynamic detection equipment and a detection method. In the detection, the contact state of the relative rotation and mutual extrusion between the shield scraper and the actual tunneling face is simulated, the alternating load resistance is applied to the shield scraper, the weld joint failure of the shield scraper is observed, and whether the weld joint strength can meet the requirements is judged. The detection equipment comprises a support frame, the support frame is provided with a mounting disc for mounting the shield scraper, further comprises a load disc for contacting the shield scraper, at least one of the load disc and the mounting disc is a rotating disc, at least one rotating disc is connected with an adjustable resistance loading device, at least one rotating disc is connected with a rotating power device, and at least one of the load disc and the support frame is connected with a propelling power device. In the detection of the shield scraper weld joint strength, the detection environment is closer to the actual working condition of the cutter head in different strata tunneling, so that the detection result is more accurate.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of shield cutter, and particularly relates to a shield cutter welding seam strength dynamic detection device and method. BACKGROUND

[0002] The shield cutter is an important component for realizing shield tunneling, and is a structure of steel base body welded with hard alloy. In the process of shield tunneling, the force acting on the cutter is constantly changing due to different rock layers at different depths. Under the action of alternating load, when the welding seam strength between the hard alloy and the steel base body is insufficient, the hard alloy is prone to fall off in whole, the shield cutter fails, and the construction is forced to stop.

[0003] In the prior art, the shield cutter welding seam strength detection is mostly static detection, that is, the shield cutter is fixed at a certain angle, a press machine is used to apply pressure to the welded hard alloy, and the welding seam strength is judged according to the pressure condition. This method is simple to operate, but the detection environment is quite different from the actual tunneling process, and the detection result has insufficient reliability.

[0004] Therefore, it is necessary to develop a shield cutter welding seam strength dynamic detection device and method to detect the welding seam strength of the shield cutter under alternating load closer to the actual working condition, and to provide a basis for reliable construction of the shield cutter in different rock layers. SUMMARY

[0005] The application aims to provide a shield cutter welding seam strength dynamic detection device and method, which is convenient for detecting the welding seam strength of the shield cutter under a condition closer to the actual working condition, and improves the welding seam strength detection precision.

[0006] To achieve the above-mentioned purpose, the technical scheme of the shield cutter welding seam strength dynamic detection method provided by the application is as follows:

[0007] A shield cutter welding seam strength dynamic detection method, in which, during detection, the contact state of the shield cutter and the actual tunneling face is simulated to keep relative rotation and mutual extrusion, alternating load resistance is applied to the shield cutter, the welding seam failure of the shield cutter is observed, and whether the welding seam strength meets the requirement is judged.

[0008] The application has the beneficial effect that the detection environment is closer to the actual working condition of the cutter head in different strata during detection of the shield cutter welding seam strength, so that the detection result is more accurate.

[0009] As a further improvement, the installation direction of the shield cutter is consistent with the installation direction of the cutter head.

[0010] The application has the beneficial effect that the consistency between the overall stress condition of the shield cutter during detection and the actual working condition is higher, and the detection result precision is improved.

[0011] As a further improvement, the load surface for contacting the shield cutter is a profiled surface, which is used to simulate the cutting helix surface of the shield cutter.

[0012] The beneficial effect is that the profiled surface moves with the cutter, which is consistent with the cutting helix movement in the actual working condition, further improving the detection result accuracy, and there is no cutting debris in the process, which is convenient for observation.

[0013] To achieve the above object, the technical scheme of the shield cutter weld strength dynamic detection equipment provided by the application is:

[0014] A shield cutter weld strength dynamic detection equipment, comprising a support frame provided with a mounting disc for mounting a shield cutter, and a load disc for contacting the shield cutter, at least one of the load disc and the mounting disc is a rotating disc, at least one rotating disc is connected with an adjustable resistance loading device, at least one rotating disc is connected with a rotating power device, and at least one of the load disc and the support frame is connected with a propulsion power device.

[0015] The beneficial effect is that the mounting disc and the load disc rotate relative to each other and press each other, simulating the contact and cooperation of the cutter head of the shield machine and the working surface in the actual working condition, the adjustable force loading device can output alternating load, simulating the force condition of the shield cutter in different rock layers, and realizing the dynamic detection of the shield cutter weld strength in an environment closer to the actual working condition, and the detection result accuracy is higher.

[0016] As a further improvement, the surface for contacting the shield cutter to be detected in the load disc is provided with a profiled structure, which is used to simulate the cutting helix surface of the shield cutter.

[0017] The beneficial effect is that the cutter moves with the profiled structure, which is consistent with the cutting helix movement in the actual working condition, further improving the detection result accuracy, and there is no cutting debris in the process, which is convenient for observation.

[0018] As a further improvement, the profiled structure comprises at least one profiled block, and the convex curved surface of the profiled block is a profiled surface.

[0019] The beneficial effect is that the convex profiled block frictionally contacts the shield cutter during the detection process, without affecting the overall strength of the load disc. At the same time, it is also convenient for processing and arrangement.

[0020] As a further improvement, the adjustable resistance loading device comprises a loading hydraulic cylinder and a loading block, the loading hydraulic cylinder is used to output alternating load, and the loading block is used to frictionally contact the load disc or the mounting disc.

[0021] The beneficial effect is that the hydraulic cylinder is convenient to control, and the alternating compression force output by the hydraulic cylinder is converted into alternating frictional resistance between the loading block and the load disc or the mounting disc, realizing that the shield cutter is subjected to variable resistance.

[0022] As a further improvement, the mounting plate is provided with a clamping device for mounting the shield tunneling cutter blade to be tested. The clamping device includes a positioning block for engaging with the mounting surface of the shield tunneling cutter blade and a clamping structure for engaging with the positioning block to lock the shield tunneling cutter blade.

[0023] The beneficial effects are: the positioning block simulates the scraper mounting position in the cutterhead of the tunnel boring machine, and the clamping structure realizes the installation and fixation of the scraper, making the overall stress of the scraper during the test more consistent with the actual working conditions, thus improving the accuracy of the test results.

[0024] As a further improvement, the clamping structure includes a pressure plate, one end of which is connected to a hydraulic cylinder for transmission, and the other end is fixedly connected to a push rod, which is used to engage with the positioning hole of the shield scraper.

[0025] The advantages are: this solution can provide greater clamping force, while also facilitating installation and disassembly.

[0026] As a further improvement, a force-equalizing cross is provided between the pressure plate and the hydraulic cylinder.

[0027] The beneficial effects are: the uniform force cross makes the clamping force acting on the shield cutter more evenly distributed on the contact surface, the shield cutter is less likely to deviate, and the overall structure is more reliable. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the dynamic testing equipment for the strength of the shield tunneling scraper weld in this invention;

[0029] Figure 2 for Figure 1 Schematic diagram of the medium load disk;

[0030] Figure 3 for Figure 2 Schematic diagram of the explosion from the main view in the direction of A;

[0031] Figure 4 for Figure 1 Enlarged diagram of the installation disk;

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Frame; 2. Shield scraper; 3. Mounting plate; 31. Mounting base; 32. Clamping hydraulic cylinder; 33. Force equalizing cross; 34. Pressure plate; 35. Push rod; 36. Positioning block; 37. Guide frame; 4. Support frame; 5. Loading plate; 51. Contouring block; 52. Bearing; 53. Bearing cover; 54. Screw; 61. Loading hydraulic cylinder; 62. Loading block; 71. Motor; 72. Motor mounting bracket; 81. Propulsion hydraulic cylinder; 82. Propulsion bracket; 9. Guide rail. Detailed Implementation

[0034] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not intended to limit the present application, i.e., the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. The components of the embodiments of the present application generally described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0035] Therefore, the detailed description of the embodiments of the present application provided below in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without making creative efforts fall within the scope of the present application.

[0036] It should be noted that the relationship terms such as "first" and "second" and the like that can appear are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any actual relationship or order between the entities or operations. Moreover, terms such as "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the elements defined by the statement "including a" or the like do not exclude processes, methods, articles or devices including the elements from the process, method.

[0037] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" that can appear should be understood broadly, for example, can be fixed connection, can be detachable connection, or integral connection; can be mechanical connection, can be electrical connection; can be direct connection, or indirect connection through intermediate medium, or can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the term "provided with" that can appear should be understood broadly, for example, the object "provided with" can be a part of the body, or arranged separately from the body and connected to the body, and the connection can be detachable connection, or non-detachable connection. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] The present invention will be further described in detail below with reference to the embodiments.

[0040] Specific embodiment 1 of the dynamic testing equipment for the strength of shield tunnel cutter welds provided by the present invention:

[0041] like Figure 1 As shown, a support frame 4 is provided on the frame 1, and the mounting plate 3 is rotatably supported on the support frame 4. The shield scraper 2 to be tested is clamped on the mounting plate 3. A load plate 5 is provided on the side opposite to the welded hard alloy surface of the shield scraper 2. In this embodiment 1, the rotational power device is a motor 71, whose power output shaft is connected to the mounting plate 3 for transmission, and can output torque to drive the mounting plate 3 to rotate. The motor 71 housing is fixedly connected to the support frame 4 through a motor fixing bracket 72. The support frame 4 is slidably engaged with the guide rail 9 provided on the frame 1. The guide rail 9 is an I-beam with extremely strong bending resistance, which can ensure the stability of the support frame 4 during the testing process. A propulsion bracket 82 is connected to the side of the support frame 4 away from the mounting plate 3. In this embodiment 1, the propulsion power device is a propulsion hydraulic cylinder 81. Under the action of the propulsion hydraulic cylinder 81, the propulsion bracket 82 drives the support frame 4 to move linearly along the guide rail 9, so that the mounting plate 3 presses the load plate 5 forward, and the two plates are in relative rotation and mutual pressing contact. In this embodiment 1, the load disk 5 is used to simulate the tunnel face of the tunnel boring machine, the support frame 4 and the propulsion support 5 are used to simulate the shield body of the tunnel boring machine, and the motor 71 and the motor fixing frame 72 are used to simulate the main drive of the tunnel boring machine.

[0042] like Figure 2 and Figure 3 As shown, the circular load disk 5 is rotatably supported on the frame 1 by a bearing 52, and the other end of the bearing 52 is closed by a bearing cover 53 and a screw 54. The load disk 5 is driven by an adjustable force loading device. In this embodiment 1, the adjustable force loading device includes a loading hydraulic cylinder 61 and a loading block 62. The loading hydraulic cylinder 61 is fixed on the frame 1, and the loading block 62 has a clamp-shaped structure with an arc-shaped surface that rubs against the outer peripheral surface of the load disk 5, providing a relatively large contact area and making the structure more reliable. The other end of the loading block 62 is driven by the loading hydraulic cylinder 61. The loading hydraulic cylinder 61 can output an alternating clamping force acting on the loading block 62, thereby realizing the alternating frictional force between the loading block 62 and the load disk 5 to simulate the alternating load of the load disk 5 on the shield scraper 2. The surface of the load disk 5 that contacts the shield scraper 2 is provided with two centrally symmetrical contour blocks 51. The protruding surface of the contour block 51 is a contour surface, specifically a spiral curved surface structure, such as... Figure 2 As shown in the diagram, the mounting plate rotates counterclockwise. The shield scraper 2 moves along the contour block 51, and its movement trajectory is consistent with the actual rock-breaking trajectory. No rock fragments are generated during the process. At the same time, it is also convenient to observe the weld failure situation, so as to determine whether the weld strength meets the requirements.

[0043] like Figure 4As shown, the clamping device provided on the mounting disc includes a mounting base 31, which is fixedly connected with the mounting disc 3 by screws. A positioning block 36 is further provided on the mounting base 31, which is matched with the installation surface of the shield scraper 2 to realize positioning. A pressing hydraulic cylinder 32 is further provided on the mounting base 31, which can provide a large pressing force and is convenient to control, so that the mounting and dismounting are convenient. The pressing hydraulic cylinder 32 pushes a pressing plate 34 and a push rod 35 provided on the pressing plate 34 along a guide frame 37 provided on the mounting base 31 to press the shield scraper 2, the push rod 35 passes through the positioning hole of the shield scraper 2, and the pressing plate 34 and the push rod 35 jointly complete the locking and pressing of the shield scraper 2. Meanwhile, a uniform force cross frame is further provided between the pressing plate 34 and the pressing hydraulic cylinder 32, so that the pressure acting on the pressing plate 34 is more uniform, the deflection is not easy to occur in the detection process, and the overall structure is more stable.

[0044] The difference between the specific embodiment 2 of the shield scraper weld seam strength dynamic detection equipment provided by the application and the embodiment 1 is mainly that, in the embodiment 1, the mounting disc 3 is rotatable under the driving action of the motor 71, and the loading hydraulic cylinder 61 and the loading block 62 provide an alternating load acting on the shield scraper 2. In the embodiment, the mounting disc is not rotatable, and is only pressed towards the load disc under the action of the advancing hydraulic cylinder, the load disc is connected with the motor, at this time, the motor serves as a rotary power device to drive the load disc, the relative rotation of the load disc and the mounting disc is maintained, and the mounting disc outputs an alternating load under the action of the loading hydraulic cylinder and the loading block.

[0045] The difference between the specific embodiment 3 of the shield scraper weld seam strength dynamic detection equipment provided by the application and the embodiment 1 is mainly that, in the embodiment 1, the advancing hydraulic cylinder 81 pushes the mounting disc 3 to press the load disc 5. In the embodiment, the load disc is slidable along the rack, and the advancing hydraulic cylinder is connected to the side of the load disc away from the mounting disc, the mounting disc is fixedly arranged in the horizontal direction, and the load disc serves as a driving part to press the mounting disc.

[0046] The difference between the specific embodiment 4 of the shield scraper weld seam strength dynamic detection equipment provided by the application and the embodiment 1 is mainly that, in the embodiment 1, the loading hydraulic cylinder 61 and the loading block 62 are combined to form an adjustable force loading device. In the embodiment, the load disc is connected with the hydraulic motor, the hydraulic motor serves as an adjustable force loading device to drive the load disc to rotate in the direction opposite to the mounting disc, the load disc is loaded on the shield scraper, and the variable load is realized by controlling the output torque of the hydraulic motor.

[0047] The difference between the specific embodiment 5 of the shield scraper weld seam strength dynamic detection equipment provided by the application and the embodiment 1 is mainly that, in the embodiment 1, the shield scraper 2 is locked under the action of the pressing hydraulic cylinder 32. In the embodiment, the shield scraper is fixed by the bolt passing through the positioning hole.

[0048] The embodiment 6 of the shield cutter weld seam strength dynamic detection equipment provided by the application is mainly different from the embodiment 1 in that the load disc 5 is provided with a profiling block 51 in the embodiment 1. In the embodiment, the surface of the load disc in contact with the shield cutter is provided with a profiling groove, the bottom of the profiling groove is a profiling surface, the curved surface structure of the bottom of the profiling groove is consistent with the convex curved surface structure of the profiling block 51, and the profiling groove is used for simulating the spiral surface cutting of the shield cutter.

[0049] The embodiment 7 of the shield cutter weld seam strength dynamic detection equipment provided by the application is mainly different from the embodiment 1 in that the rotating power device is a motor 71 in the embodiment 1, and the rotating power device is a hydraulic motor in the embodiment.

[0050] The embodiment 8 of the shield cutter weld seam strength dynamic detection equipment provided by the application is mainly different from the embodiment 1 in that the propelling power device is a propelling hydraulic cylinder 81 in the embodiment 1. In the embodiment, the propelling power device is a motor and a screw nut mechanism, the screw rod is connected with a propelling support 82, and the motor drives the screw rod to advance or retreat, so that the extrusion and separation of the mounting disc and the load disc are realized.

[0051] The embodiment 9 of the shield cutter weld seam strength dynamic detection equipment provided by the application is mainly different from the embodiment 1 in that the load disc 5 is provided with a profiling block 51 in the embodiment 1. In the embodiment, the load disc is only a disc, so that the shield cutter has a cutting effect on the load disc in the detection process, but the dynamic detection purpose can still be achieved.

[0052] The embodiment 10 of the shield cutter weld seam strength dynamic detection equipment provided by the application is mainly different from the embodiment 1 in that the loading hydraulic cylinder 61 and the loading block 62 act on the load disc 5 in the embodiment 1. In the embodiment, the loading hydraulic cylinder and the loading block act on the mounting disc, and the loading hydraulic cylinder and the loading block have a resistance effect on the rotation of the mounting disc.

[0053] The embodiment 11 of the shield cutter weld seam strength dynamic detection equipment provided by the application is mainly different from the embodiment 1 in that the load disc 5 includes two center-symmetric profiling blocks 5 in the embodiment 1. In the embodiment 1, the load disc only has one profiling block, and the spiral cutting movement of the shield cutter can still be simulated.

[0054] The embodiment of the shield cutter weld seam strength dynamic detection method provided by the application is as follows:

[0055] The shield scraper weld strength dynamic detection method simulates the relative rotation and mutual extrusion contact state of the shield scraper and the actual tunneling working face under the working face, applies alternating load to the shield scraper, simulates the force in different strata, makes the detection environment closer to the actual working condition of the cutterhead in different strata tunneling, and the detection result is more accurate. In order to realize the method, the detection equipment described in any one of embodiments 1-11 of the shield scraper weld strength dynamic detection equipment can be used. Taking embodiment 1 as an example, the specific use includes the following steps:

[0056] S1: clamping the shield scraper, placing the shield scraper 2 into the clamping device, positioning the mounting surface of the shield scraper 2 with the positioning block 36, controlling the pressing hydraulic cylinder 32 to push the pressing plate 34 and the push rod 35 arranged on the pressing plate 34 to press the shield scraper 2 along the guide frame 37, and inserting the push rod 35 into the positioning hole of the shield scraper 2 to realize the pressing and locking of the shield scraper 2;

[0057] S2: simulating the tunneling action of the shield scraper, starting the motor 71 and the advancing hydraulic cylinder 81 to make the mounting disc 3 rotate and move linearly along the guide rail 9 to press the load disc 5, and the shield scraper 2 interacts with the profiling block 51 on the load disc 5;

[0058] S3: simulating the tunneling resistance, starting the loading hydraulic cylinder 61 to push the resistance block 62 to press the outer peripheral surface of the load disc 5 to provide the friction resistance acting on the load disc 5 to simulate the tunneling resistance, and adjusting the pushing force of the loading hydraulic cylinder 61 based on the working condition to make the environment closer to the real working environment;

[0059] S4: judging the weld strength, the shield scraper 2 and the raised profiling surface of the profiling block 51 keep relative rotation and mutual extrusion, no cutting powder slag is generated in the process, which is convenient for observing the weld failure, and the weld strength of the shield scraper 2 is judged whether it can meet the use according to the failure;

[0060] S5: completing the detection, stopping the equipment, and removing the shield scraper 2 for the next round of detection.

[0061] Finally, it should be noted that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments without creative labor, or replace some technical features with equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for dynamically detecting the strength of a weld seam of a shield cutter, characterized in that, In the detection, the shield scraper is installed on the mounting disc, the mounting disc is kept rotating and pressed to the load disc to simulate the relative rotation and mutual pressing contact state of the shield scraper and the actual tunneling working face, the load disc is a disc and is rotatably supported on the rack through bearings, the load disc is connected with an adjustable resistance loading device, the adjustable resistance loading device comprises a loading hydraulic cylinder and a loading block, the loading hydraulic cylinder is used to output an alternating load to the loading block, the loading block is used to frictionally contact the outer circumferential surface of the load disc, the load surface of the load disc used to contact the shield scraper is a profiled surface, the profiled surface is used to simulate the spiral surface cut by the shield scraper, the alternating load resistance is applied to the shield scraper through the load disc, the weld failure of the shield scraper is observed, and whether the weld strength can meet the requirements is determined.

2. The method for dynamically detecting the weld strength of a shield cutter according to claim 1, wherein, The installation orientation of the shield scraper is consistent with the installation orientation on the cutter head.

3. A shield cutter weld seam strength dynamic detection device, characterized in that, The support frame is provided with a mounting disc for mounting the shield scraper, and the support frame is connected with a propelling power device to linearly move the support frame along the guide rail.

4. The shield-journal weld-strength dynamic detection apparatus of claim 3, wherein, The profiled structure comprises at least one profiled block, and the convex curved surface of the profiled block is a profiled surface.

5. The shield-journal weld-strength dynamic detection apparatus of claim 3, wherein, The mounting disc is provided with a clamping device for mounting the shield scraper to be detected, and the clamping device comprises a positioning block for cooperating with the mounting surface of the shield scraper and a pressing structure for cooperating with the positioning block to lock the shield scraper.

6. The shield-journal weld-strength dynamic detection apparatus of claim 5, wherein, The pressing structure comprises a pressing plate, one end of the pressing plate is in transmission connection with a pressing hydraulic cylinder, the other end of the pressing plate is fixedly connected with a push rod, and the push rod is used to cooperate with a positioning hole of the shield scraper.

7. The shield-journal weld-strength dynamic detection apparatus of claim 6, wherein, A uniform force cross is further arranged between the pressing plate and the pressing hydraulic cylinder.

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