Welding method for shovel teeth in shield tunneling machine

Abstract

The invention provides a welding method for relieved teeth in a shield tunneling machine, and belongs to the technical field of shield tunneling machines. Comprising the steps that the inner contour surface of the relieved tooth is attached to the outer contour surface of an anterior shield notch ring in the shield tunneling machine; a first welding layer is welded between the inner contour surface of the form relieved tooth and the outer contour surface of the anterior shield notch ring in a surfacing manner; a second welding layer is arranged between the shovel teeth and the upper end face of the anterior shield notch ring; a third welding layer is arranged between the shovel teeth and the lower end face of the anterior shield notch ring. The inner contour surface of the form relieved tooth and the outer contour surface of the anterior shield notch ring are arranged in an attached mode, so that it is guaranteed that the form relieved tooth can be attached to the anterior shield notch ring; the first wear-resistant welding layer is arranged between the inner contour surface of the form relieved tooth and the outer contour surface of the anterior shield notch ring, and the thickness of the form relieved tooth is combined and can be adjusted according to the tunneling distance of a shield tunneling machine, tunnel environment characteristics and the like, so that the manufacturing cost of the first wear-resistant welding layer in the welding process is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of shield machines and relates to a welding method for shovel teeth in a shield machine. Background Art

[0002] During the tunneling process of the shield machine, the front shield cut ring contacts the tunnel wall and is easily worn, which affects the slag guiding ability of the cut ring; damages the front shield cylinder, and makes it difficult to repair and renovate the shield body later. At present, the main method to solve this problem is to weld a whole circle of wear-resistant layer on the front shield cut ring, but this method is not easy to replace after the wear-resistant layer is worn, and the thicker the welded wear-resistant layer, the higher the cost and the longer it takes; if the thickness is low, it is difficult to meet the wear-resistant requirements. Summary of the invention

[0003] In view of the deficiencies in the prior art, the present invention provides a method for welding shovel teeth in a shield machine, aiming to solve the problem that the current cut ring cladding is wear-resistant and difficult to replace.

[0004] The present invention provides a method for welding shovel teeth in a shield machine, comprising the following steps:

[0005] Step 1: fit the inner contour surface of the shovel tooth to the outer contour surface of the front shield cutout ring in the shield machine;

[0006] Step 2: Weld the shovel teeth and the front shield cutout ring together; the specific process is as follows:

[0007] ①, a first welding layer is welded between the inner contour surface of the shovel tooth and the outer contour surface of the front shield cutout ring by surfacing welding;

[0008] ② A second welding layer is provided between the shovel teeth and the upper end surface of the front shield cutout ring;

[0009] ③. A third welding layer is provided between the shovel teeth and the lower end surface of the front shield cutout ring.

[0010] Furthermore, the first welding layer is configured as a first wear-resistant welding layer formed by welding with a wear-resistant flux-cored welding wire.

[0011] Furthermore, the thickness of the first wear-resistant welding layer is set to 5mm-10mm.

[0012] Furthermore, the second welding layer is formed by fillet welding, and the upper end surface of the second welding layer is flush with the upper end surface of the skiving teeth.

[0013] Furthermore, the third welding layer is a second wear-resistant welding layer formed by surfacing welding.

[0014] Furthermore, the upper end surface of the third welding layer is flush with the lower end surface of the skiving teeth, and the third welding layer extends 10 mm-50 mm along the lower end surface of the front shield cutout ring in a direction away from the skiving teeth.

[0015] Furthermore, the third welding layer is formed by surfacing with wear-resistant flux-cored welding wire.

[0016] Furthermore, a plurality of shovel teeth are arranged along the circumferential direction of the front shield cutout ring, and two adjacent shovel teeth are welded by wear-resistant flux-cored welding in a surfacing manner.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] (1) The present invention arranges the inner contour surface of the shovel tooth and the outer contour surface of the front shield cut ring in a fitting manner (that is, the inner contour surface of the shovel tooth and the outer contour surface of the front shield cut ring are matched with each other) to ensure that the shovel tooth can fit on the front shield cut ring; and a first wear-resistant welding layer is arranged between the inner contour surface of the shovel tooth and the outer contour surface of the front shield cut ring. The thickness of the shovel tooth can be adjusted according to the excavation distance of the shield machine, the environmental characteristics of the tunnel, etc., so as to reduce the production cost of the first wear-resistant welding layer during the welding process; the overall structure (shovel tooth and front shield cut ring) welded by the welding method of the present invention has the characteristics of less time-consuming production and less wear-resistant, which can save time cost.

[0019] (2) The present invention welds the shovel teeth to the front shield cut ring. When the shovel teeth are severely worn, they can be planed off and re-welded with new shovel teeth to achieve rapid replacement; the front end of the shovel teeth is narrow, which can improve the slag guiding ability of the front shield cut ring. The top of the front shield cut ring is less worn than the bottom, and no slag guiding is required, so the top can be treated by surfacing welding to resist wear.

[0020] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0022] Figure 1 Schematic diagram of the arrangement between the front shield cutout ring and the shovel teeth in an embodiment of the present invention;

[0023] Figure 2 for Figure 1 Axonometric diagram of

[0024] Figure 3 yes Figure 1Schematic diagram of the AA section;

[0025] Figure 4 yes Figure 1 Schematic diagram of the middle BB section;

[0026] Figure 5 yes Figure 3 Schematic diagram of the CC section.

[0027] in:

[0028] 1. Shovel teeth, 2. Front shield cut ring, 3. First welding layer, 4. Second welding layer, 5. Third welding layer. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present invention more clear and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings. It should be noted that the drawings of the present invention are all simplified and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the implementation of the present invention; the "number" mentioned in the present invention is not limited to the specific number in the examples in the accompanying drawings; the directions or positional relationships indicated by "front", "middle", "back", "left", "right", "up", "down", "top", "bottom", "middle", etc. mentioned in the present invention are based on the directions or positional relationships shown in the drawings of the present invention, and do not indicate or imply that the devices or components referred to must have a specific direction, nor can they be understood as limitations on the present invention.

[0030] Example:

[0031] See also Figure 1 and Figure 2 As shown, a method for welding shovel teeth in a shield machine provided by the present invention comprises the following steps:

[0032] Step 1: Fit the inner contour surface of the shovel tooth 1 to the outer contour surface of the front shield cutout ring 2 in the shield machine (see Figure 3 shown);

[0033] Step 2: Weld the shovel teeth 1 and the front shield cutout ring 2 together; the specific process is as follows:

[0034] ①, the inner contour surface of the shovel tooth 1 and the outer contour surface of the front shield cutout ring 2 are welded with a first welding layer 3 by surfacing welding (see Figure 4 As shown), the first welding layer 3 is preferably configured as a first wear-resistant welding layer welded by a wear-resistant flux-cored welding wire;

[0035] ②, a second welding layer 4 is provided between the shovel teeth 1 and the upper end surface of the front shield cutout ring 2, and the second welding layer 4 is preferably welded by fillet welding;

[0036] ③. A third welding layer 5 is provided between the shovel teeth 1 and the lower end surface of the front shield cutout ring 2. The third welding layer 5 is preferably a second wear-resistant welding layer formed by surfacing welding.

[0037] Preferably, the thickness of the first wear-resistant welding layer between the inner contour surface of the shovel tooth 1 and the outer contour surface of the front shield cutout ring 2 is set to 5mm-10mm.

[0038] Preferably, the thickness of the second welding layer 4 is equal to the thickness of the shovel tooth 1; specifically, after the upper end surface of the shovel tooth 1 and the upper end surface of the front shield cutout ring 2 are welded by fillet welding, the upper end surface of the second welding layer 4 and the upper end surface of the shovel tooth 1 are flush with each other.

[0039] Preferably, the upper end surface of the third welding layer 5 is flush with the lower end surface of the shovel tooth 1, and the third welding layer 5 extends 10mm-50mm along the lower end surface of the front shield cutout ring 2 in a direction away from the shovel tooth 1. Further preferably, the third welding layer 5 is formed by surfacing with wear-resistant flux-cored wire.

[0040] Furthermore, after the shovel tooth 1 is welded to the bottom area of ​​the front shield cutout ring 2, the front end face size (L1) of the shovel tooth 1 is narrower than the front end face size (L2) of the front shield cutout ring 2; after the shovel tooth 1 is welded, the end face size (L3) is narrower than the front end face size (L4) of the front shield cutout ring 2, so that the overall structure (shovel tooth 1 and front shield cutout ring 2) after welding by the welding method provided by the present invention has better slag guiding ability.

[0041] As a further embodiment of the present invention, see Figure 5 As shown, a plurality of shovel teeth 1 are provided along the circumferential direction of the front shield cutout ring 2, and two adjacent shovel teeth 1 are welded by wear-resistant flux-cored welding using a surfacing method to prevent debris from accumulating in the gap between the two shovel teeth 1 during excavation.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for welding shovel teeth in a shield machine, characterized in that: The following steps are involved: Step 1: fit the inner contour surface of the shovel tooth to the outer contour surface of the front shield cutout ring in the shield machine; Step 2: Weld the shovel teeth and the front shield cutout ring together; the specific process is as follows: ①, a first welding layer is welded between the inner contour surface of the shovel tooth and the outer contour surface of the front shield cutout ring by surfacing welding; ② A second welding layer is provided between the shovel teeth and the upper end surface of the front shield cutout ring; ③. A third welding layer is provided between the shovel teeth and the lower end surface of the front shield cutout ring.

2. The method for welding shovel teeth in a shield machine according to claim 1, characterized in that: The first welding layer is configured as a first wear-resistant welding layer formed by welding with a wear-resistant flux-cored wire.

3. The method for welding shovel teeth in a shield machine according to claim 2, characterized in that: The thickness of the first wear-resistant welding layer is set to 5mm-10mm.

4. The method for welding shovel teeth in a shield machine according to any one of claims 1 to 3, characterized in that: The second welding layer is formed by fillet welding, and the upper end surface of the second welding layer is flush with the upper end surface of the skiving teeth.

5. The method for welding shovel teeth in a shield machine according to claim 4, characterized in that: The third welding layer is a second wear-resistant welding layer formed by surfacing welding.

6. The method for welding shovel teeth in a shield machine according to claim 5, characterized in that: The upper end surface of the third welding layer is flush with the lower end surface of the skiving teeth, and the third welding layer extends 10mm-50mm along the lower end surface of the front shield cutout ring in a direction away from the skiving teeth.

7. The method for welding shovel teeth in a shield machine according to claim 5 or 6, characterized in that: The third welding layer is formed by surfacing with wear-resistant flux-cored welding wire.

8. The method for welding shovel teeth in a shield machine according to claim 7, characterized in that: A plurality of shovel teeth are arranged along the circumferential direction of the front shield cutout ring, and two adjacent shovel teeth are welded by wear-resistant flux-cored welding in a surfacing manner.

Images