A welding connection tool for a cutter head of a shield tunneling machine

Abstract

The utility model discloses a kind of welding connection tool for shield machine cutterhead, belong to welding tool technical field;Including base, center plate, positioning mechanism and locking mechanism, the positioning mechanism includes the first fixed block that is driven by first threaded rod and moves radially, the locking mechanism is integrally arranged above the first fixed block, and the locking mechanism includes the second fixed block fixed on the first fixed block, and the second threaded rod is threadedly connected in the second fixed block, and the bottom is connected with the locking plate.

Description

Technical Field

[0001] This utility model relates to the field of welding tooling technology, and in particular to a welding connection tooling for the cutterhead of a tunnel boring machine. Background Technology

[0002] The cutterhead of a tunnel boring machine (TBM) is a core working component, characterized by its large size, numerous components, and extremely high manufacturing precision. Welding is a crucial process in the cutterhead's production, connecting its various structural parts; the quality of the welding directly determines the overall structural strength and service life of the cutterhead. To ensure welding precision, specialized welding fixtures are typically used to accurately position and securely clamp the cutterhead components.

[0003] In existing technologies, common welding fixtures typically employ integrated positioning and clamping devices. These devices achieve positioning by using radially moving positioning blocks to press against the sidewalls of the workpiece. To resist the enormous thermal stress generated during welding and prevent workpiece deformation, the operator needs to apply a very large final locking force to the positioning blocks after positioning is complete.

[0004] However, in this integrated design, the precise positioning function and the powerful locking function are often coupled and interfere with each other. When the operator applies a large locking torque to the positioning mechanism to obtain sufficient clamping force, this process inevitably generates additional lateral forces or torques. These additional forces react on the workpiece and positioning block, which are already in precise positions, easily causing slight displacement or tilting of the workpiece, thus destroying the precise positioning achieved in the previous step. This loss of positioning accuracy at the moment of locking directly affects the final welding quality and assembly accuracy.

[0005] Therefore, this utility model proposes a welding connection fixture for the cutterhead of a tunnel boring machine to overcome the shortcomings of the prior art. Utility Model Content

[0006] To overcome the above deficiencies, this utility model provides a welding connection fixture for the cutterhead of a tunnel boring machine, which aims to improve the problems in the prior art where positioning and locking interfere with each other when welding and fixing large workpieces, resulting in decreased accuracy, and the clamping force is insufficient to suppress thermal deformation.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a welding connection fixture for a tunnel boring machine cutterhead, comprising: a base, and a center plate disposed above the base, wherein the center plate has an insertion hole, a positioning mechanism, the positioning mechanism comprising a center ring, an insertion rod fixedly connected below the center ring, a fixing plate fixedly connected to the outer wall of the center ring, a first threaded rod threadedly connected to a first fixing block, and a locking mechanism.

[0008] The insertion rod is inserted into the insertion hole, and the first threaded rod is rotatably mounted on the fixing plate, so that the first fixing block can move along the axial direction of the first threaded rod.

[0009] The locking mechanism is positioned above the first fixing block, and includes a second fixing block that is fixedly connected to the first fixing block by bolts, and a second threaded rod that is threaded inside the second fixing block, with a locking plate connected to the bottom of the second threaded rod.

[0010] Preferably, there are multiple positioning mechanisms and locking mechanisms, and they are arranged in a ring array around the center of the central plate.

[0011] Preferably, the positioning mechanism further includes a fixing frame, which is fixedly connected to the end of the fixing plate away from the central ring.

[0012] Preferably, the positioning mechanism further includes a fixing ring, which is rotatably connected to the inner wall of the fixing frame, and one end of the first screw passes through and is connected to the fixing ring.

[0013] Preferably, a handle is fixedly connected to the end of the first threaded rod away from the fixed ring.

[0014] Preferably, the top of the second threaded rod is provided with a slot, and the locking mechanism further includes a detachable locking rod, one end of which is fixedly connected to a locking block that can be inserted into the slot.

[0015] Preferably, the card block is provided with an eccentric structure, the outline of which abuts against the top end face of the second threaded rod.

[0016] Preferably, the locking plate is rotatably connected to the bottom of the second threaded rod.

[0017] This utility model has the following beneficial effects: 1. In this utility model, by setting the locking mechanism for final locking on the movable fixed block for radial positioning, the positioning action and the locking action are structurally separated. This solves the problem in the prior art where the huge locking force when clamping the workpiece easily causes the positioned workpiece to shift, thereby reducing the clamping accuracy. It achieves the technical effect of accurate positioning first and then strong locking, ensuring the positional stability of the workpiece throughout the clamping process and significantly improving the assembly accuracy before welding.

[0018] 2. This utility model, by using a detachable eccentric locking rod and the slot at the top of the second threaded rod to achieve final locking using the principle of eccentric wheel, solves the problems of insufficient clamping force, cumbersome operation and low efficiency of traditional bolt locking methods. It achieves the technical effects of labor-saving operation, rapid locking and huge clamping force, which can effectively suppress the deformation of the workpiece caused by thermal stress during welding, and at the same time greatly improve the clamping efficiency.

[0019] 3. This utility model solves the problem of uneven distribution of support points and clamping points when clamping large annular workpieces such as shield machine cutterheads by distributing multiple sets of positioning and locking mechanisms in a circular array around the central plate. This results in unstable fixing and difficulty in controlling overall deformation. It achieves the technical effect of uniform, balanced and stable distribution of radial positioning force and vertical locking force applied to the workpiece in the circumferential direction, ensuring the overall clamping rigidity and stability of large workpieces. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of a welding connection fixture for a tunnel boring machine cutterhead proposed in this utility model; Figure 2 This is a schematic diagram of the central ring portion of a welding connection fixture for a tunnel boring machine cutterhead proposed in this utility model; Figure 3 This is a schematic diagram of the fixing plate part of a welding connection tooling for a tunnel boring machine cutterhead proposed in this utility model; Figure 4 for Figure 2 Enlarged view of point A in the middle.

[0021] Legend: 1. Base; 2. Positioning mechanism; 201. Central ring; 202. Insert rod; 203. Fixing plate; 204. First threaded rod; 205. First fixing block; 206. Fixing frame; 207. Fixing ring; 208. Handle; 3. Locking mechanism; 301. Locking rod; 302. Second fixing block; 303. Second threaded rod; 304. Locking plate; 305. Locking block; 306. Locking groove; 4. Workpiece; 5. Center plate; 6. Insertion hole. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please refer to Figures 1 to 4This utility model provides a welding connection fixture for the cutterhead of a tunnel boring machine, which aims to solve the problems in the prior art where positioning and locking interfere with each other when welding and fixing large objects, resulting in a decrease in accuracy, and the clamping force is insufficient to suppress thermal deformation.

[0024] The shield machine cutterhead welding connection fixture includes a base 1 and a center plate 5 set above the base 1. The center plate 5 is used to support the workpiece 4 to be processed. The fixture also includes a plurality of positioning mechanisms 2 and locking mechanisms 3 arranged in a ring array around the center of the center plate 5, which position and clamp the workpiece 4 in a multi-point coordinated manner.

[0025] Specifically, the upper surface of the center plate 5 is provided with an insertion hole 6 for realizing the center positioning reference of the workpiece 4. The structure of the positioning mechanism 2 includes a center ring 201, and an insertion rod 202 is fixedly connected to the lower part of the center ring 201. In use, the insertion rod 202 is inserted into the insertion hole 6 of the center plate 5 to accurately determine the center position of the entire positioning mechanism 2 and even the workpiece 4. On the outer wall of the center ring 201, a fixing plate 203 extending radially outward is fixedly connected. The fixing plate 203 serves as a platform for installing subsequent moving and locking structures.

[0026] To achieve radial positioning of workpiece 4, the positioning mechanism 2 also includes a first fixed block 205 as a radial moving platform and a first threaded rod 204 that drives the first fixed block 205 to move. To ensure stable installation of the first threaded rod 204, a fixed frame 206 is fixedly connected to the end of the fixed plate 203 away from the central ring 201. A fixed ring 207 is rotatably connected to the inner wall of the fixed frame 206. One end of the first threaded rod 204 passes through the fixed ring 207 and is connected to the fixed ring 207. This structure allows the first threaded rod 204 to rotate freely but its axial position is fixed. The other end of the first threaded rod 204 is fixedly connected to a handle 208 for easy operation. The rod body of the first threaded rod 204 is threaded through the inside of the first fixed block 205. Therefore, when the handle 208 is rotated to drive the first threaded rod 204 to rotate, the first fixed block 205 will move smoothly inward or outward along the axial direction of the first threaded rod 204 until the inner end face of the first fixed block 205 abuts against the side wall of the workpiece 4, thus completing the radial positioning.

[0027] The core innovation of this utility model lies in the fact that the locking mechanism 3, used for final strong locking, is integrally and independently set above the first fixed block 205, which serves as a moving platform. This achieves the separation and cooperation of the positioning and locking functions in the structure. The locking mechanism 3 includes a second fixed block 302, which is fixedly connected to the upper surface of the first fixed block 205 by bolts, so that it moves radially together with the first fixed block 205. Inside the second fixed block 302, a second threaded rod 303 is threadedly connected. This threaded connection allows the second threaded rod 303 to adjust its vertical height relative to the second fixed block 302 by rotating itself, in order to accommodate workpieces 4 of different thicknesses. At the bottom of the second threaded rod 303, a locking plate 304 is connected for directly pressing the upper surface of the workpiece 4. The locking plate 304 is rotatably connected to the bottom of the second threaded rod 303 to prevent torque from being transmitted to the workpiece 4 during locking.

[0028] The locking mechanism 3 also includes a locking lever 301 as an operating tool. One end of the locking lever 301 is fixedly connected to a locking block 305. Correspondingly, a slot 306 for receiving and guiding the locking block 305 is provided on the top of the second threaded rod 303. During the locking operation, the locking block 305 of the locking lever 301 is inserted into the slot 306 of the second threaded rod 303. The key point here is that the locking block 305 is provided with an eccentric structure. The contour surface of the eccentric structure abuts against the top end face of the second threaded rod 303 or the bottom surface of the slot 306.

[0029] Once the clamping rod 301 is inserted into place, the operator rotates it at a specific angle, such as 90 degrees. During this rotation, due to the geometric characteristics of the eccentric structure, which has a continuously varying radius from low to high, the rotation causes the high point or part with a larger radius on the eccentric structure's contour to press down and act on the top end face of the second threaded rod 303. This downward pressure is transmitted directly downward through the rigid body of the second threaded rod 303, ultimately driving the locking plate 304 connected to the bottom of the second threaded rod 303 to move downward. This applies a huge and uniform clamping force to the upper surface of the workpiece 4, achieving a secure lock. This force-amplifying design using the principle of the eccentric wheel allows the operator to obtain a clamping force several times amplified by applying only a small torque to rotate the clamping rod 301. Furthermore, the entire locking action can be completed in a very short time, greatly improving clamping efficiency. After welding is completed, rotating the clamping rod 301 in the opposite direction quickly releases the clamping force, and then the clamping rod 301 can be pulled out of the slot 306.

[0030] As a preferred overall layout, in order to provide uniform and stable support and clamping force for large ring-shaped objects, thereby effectively suppressing overall deformation during the welding process, the number of positioning mechanisms 2 and locking mechanisms 3 is multiple, and these positioning mechanisms 2 and locking mechanisms 3 are evenly distributed in a ring array around the center of the center plate 5, ensuring that the radial positioning force and vertical locking force acting on the workpiece 4 are balanced in the circumferential direction.

[0031] As a specific implementation of the driving part in the positioning mechanism 2, in order to provide stable and reliable rotational support for the first threaded rod 204 and accurately constrain its axial position, a fixed frame 206 is fixedly connected to the end of the fixed plate 203 away from the central ring 201. The fixed frame 206 serves as a sturdy mounting base. Inside the fixed frame 206, a fixed ring 207 is further rotatably connected. One end of the first threaded rod 204 passes through and is connected to the fixed ring 207. The presence of the fixed ring 207 allows the first threaded rod 204 to rotate freely without obstruction, while firmly restricting the axial movement of the first threaded rod 204, ensuring a smooth and accurate transmission process. Furthermore, to facilitate efficient manual operation, a handle 208 is fixedly connected to the end of the first threaded rod 204 away from the fixed ring 207. The operator can directly hold and rotate the handle 208 to quickly adjust the radial position of the first fixed block 205.

[0032] As a preferred implementation of the quick locking function of the locking mechanism 3, in order to achieve efficient and labor-saving strong locking, a slot 306 for quick connection of operating tools is specially provided on the top of the second threaded rod 303. The locking mechanism 3 is correspondingly equipped with a detachable locking rod 301. One end of the locking rod 301 is fixedly connected to a locking block 305 that can precisely match the shape of the slot 306 and be inserted therein. In order to achieve a significant force-increasing effect, an eccentric structure is provided on the locking block 305. The outline of the eccentric structure abuts against the top end face of the second threaded rod 303. By rotating the locking rod 301, a huge downward force can be generated by lever and eccentric principle.

[0033] As another optimization of the locking mechanism 3, in order to avoid unnecessary frictional torque or surface scratches on the upper surface of the workpiece 4 while applying vertical locking force, the bottom of the locking plate 304 and the second threaded rod 303 are rotatably connected, for example by setting a thrust bearing or a simple pin structure. This design allows the locking plate 304 to stop rotating after contacting the surface of the workpiece 4 when the second threaded rod 303 is driven to press down, transmitting only pure vertical downward pressure and protecting the surface finish of the workpiece 4.

[0034] Working principle: When performing clamping operations, the workpiece 4 is first placed on the upper surface of the center plate 5. Then, the insertion rod 202 of the positioning mechanism 2 is inserted into the insertion hole 6 of the center plate 5. Through the insertion and engagement of the insertion rod 202 and the insertion hole 6, the initial center positioning of the workpiece 4 is completed.

[0035] After center positioning is completed, the operator turns the handle 208, which drives the first threaded rod 204 to rotate. Due to the threaded transmission relationship between the first threaded rod 204 and the first fixed block 205, multiple first fixed blocks 205 will move smoothly inward along the axis of their respective first threaded rods 204 until they simultaneously press against the side wall of the workpiece 4 from multiple radial directions. This step completes the precise radial positioning and initial fixation of the workpiece 4.

[0036] After the radial position of workpiece 4 is completely fixed, a final vertical forceful locking is performed. Before locking, the second threaded rod 303 can be rotated according to the specific thickness of workpiece 4. The initial height of the locking plate 304 can be precisely pre-adjusted using the threaded connection between the second threaded rod 303 and the second fixing block 302. After adjustment, the locking block 305 of the locking rod 301 is inserted into the locking groove 306 at the top of the second threaded rod 303, and the locking rod 301 is rotated. During the rotation, the eccentric structure on the locking block 305 acts on the top end face of the second threaded rod 303. A strong axial thrust is generated, which is directly transmitted to the locking plate 304 below through the second threaded rod 303. This causes the locking plate 304 to press tightly against the upper surface of the workpiece 4 with great pressure. Since the locking mechanism 3 is set on the first fixed block 205 that has been positioned, the process of applying a huge vertical locking force will not interfere with the radial position of the workpiece 4 that has been determined, thus ensuring the stability and high precision of the entire clamping process. After the above steps, the workpiece 4 is firmly fixed on the center plate 5, providing stable and reliable support for subsequent welding operations.

Claims

1. A welding connection fixture for a tunnel boring machine cutterhead, used for positioning and clamping a workpiece (4), comprising: A base (1) and a center plate (5) disposed above the base (1), wherein the center plate (5) has an insertion hole (6) and a positioning mechanism (2), wherein the positioning mechanism (2) includes a center ring (201), wherein a plug rod (202) is fixedly connected to the lower part of the center ring (201) and engages with the insertion hole (6), wherein a radially extending fixing plate (203) is fixedly connected to the outer wall of the center ring (201), and the positioning mechanism (2) further includes a first threaded rod (204) threadedly connected to a first fixing block (205), wherein the first threaded rod (204) is rotatably mounted on the fixing plate (203), such that the first The fixing block (205) is axially movable along the first threaded rod (204) to abut against the side wall of the workpiece (4). The shield machine cutterhead welding connection fixture further includes a locking mechanism (3). The locking mechanism (3) is integrally disposed above the first fixing block (205). The locking mechanism (3) includes a second fixing block (302) fixedly connected to the first fixing block (205) by bolts, and a second threaded rod (303) threadedly connected inside the second fixing block (302). The bottom of the second threaded rod (303) is connected to a locking plate (304) for pressing the workpiece (4).

2. The welding connection fixture for the cutterhead of a tunnel boring machine according to claim 1, characterized in that, The number of the positioning mechanism (2) and the locking mechanism (3) is multiple, and they are arranged in a ring array around the center of the center plate (5).

3. The welding connection fixture for the cutterhead of a tunnel boring machine according to claim 1, characterized in that, The positioning mechanism (2) further includes a fixing frame (206), which is fixedly connected to one end of the fixing plate (203) away from the central ring (201).

4. The welding connection fixture for the cutterhead of a tunnel boring machine according to claim 3, characterized in that, The positioning mechanism (2) further includes a fixing ring (207), which is rotatably connected to the inner wall of the fixing frame (206). One end of the first threaded rod (204) passes through the fixing ring (207) and is connected to it.

5. The welding connection fixture for the cutterhead of a tunnel boring machine according to claim 4, characterized in that, A handle (208) is fixedly connected to the end of the first threaded rod (204) away from the fixed ring (207).

6. The welding connection fixture for the cutterhead of a tunnel boring machine according to claim 1, characterized in that, The second threaded rod (303) has a slot (306) at its top. The locking mechanism (3) also includes a detachable lever (301). One end of the lever (301) is fixedly connected to a lever (305) that can be inserted into the slot (306).

7. The welding connection fixture for the cutterhead of a tunnel boring machine according to claim 6, characterized in that, The card block (305) is provided with an eccentric structure, the outline of which abuts against the top end face of the second threaded rod (303).

8. The welding connection fixture for the cutterhead of a tunnel boring machine according to claim 1, characterized in that, The locking plate (304) is rotatably connected to the bottom of the second threaded rod (303).

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