Novel wear-resistant inserted tooth cutter ring

Abstract

The utility model provides a novel wear-resistant inserted tooth cutter ring which comprises a cutter body. The cylindrical tooth alloy teeth are arranged on the periphery of the cutter body at equal intervals in a surrounding manner; the two circles of wear-resistant layers are symmetrically arranged on the two end surfaces of the cutter body; the grooves are formed in the periphery of the cutter body at equal intervals in a surrounding mode and located between every two columnar tooth alloy teeth, and the wear-resisting strips are arranged in the grooves. The integral wear resistance and structural stability of the cutter body can be remarkably improved, wear stress is uniformly distributed, local excessive wear is avoided, the impact resistance of the cutter body under high-load and high-wear working conditions is enhanced, the service life is prolonged, meanwhile, thermal stress and deformation are effectively reduced through the synergistic effect of the wear-resistant layer and the wear-resistant strips, and the service life of the cutter body is prolonged. The stable operation of the cutter body under high-temperature and complex working conditions is ensured, and the maintenance cost and the production loss are reduced.

Description

Technical Field

[0001] This utility model relates to a novel wear-resistant toothed cutter ring. Background Technology

[0002] Toothed cutterheads are key components used in tunnel boring machines (TBMs) and other similar machines during tunneling, used to break up underground rock and soil layers. TBMs are the most commonly used mechanical equipment in urban underground rail transit construction projects, and the performance of the toothed cutterheads directly affects the performance and working efficiency of the TBM, thus impacting the efficiency and cost of the tunneling project.

[0003] Existing toothed cutterheads consist of a cutterhead body with a ring of alloy teeth mounted on its outer circumference. Tunneling is achieved through the collision of these alloy teeth with the rock and soil layers as the cutterhead rotates. However, when excavating through highly abrasive rock formations, such as those with high quartz content, existing toothed cutterheads suffer from several problems. Firstly, the end faces and outer circumference of the cutterhead body are prone to cracking or other damage due to prolonged high-speed friction caused by the continuous high-speed rotation of the cutterhead body. Secondly, the alloy teeth are also susceptible to loosening due to continuous collision and friction with the rock during rock breaking. This can lead to severe wear on the cutterhead body as the alloy teeth remain in continuous contact with the highly abrasive rock, causing them to detach from the tooth holes and resulting in damage to the toothed cutterhead. Both of these factors result in insufficient strength and service life of the existing toothed cutter rings during use, leading to frequent damage and replacement of the toothed cutter rings during tunnel boring machine (TBM) operations. This reduces the efficiency of the TBM and results in higher production costs for underground rail transit projects. Utility Model Content

[0004] This invention provides a novel wear-resistant toothed cutter ring that can effectively solve the above-mentioned problems.

[0005] This utility model is implemented as follows:

[0006] A novel wear-resistant toothed cutter ring, comprising

[0007] Blade body;

[0008] A plurality of cylindrical alloy teeth are arranged at equal intervals around the outer periphery of the cutter body;

[0009] Two wear-resistant layers are symmetrically arranged on both ends of the blade body;

[0010] Wear-resistant strips are disposed within a plurality of grooves that are equally spaced around the outer periphery of the cutter body and between every two of the cylindrical alloy teeth.

[0011] The beneficial effects of this utility model are:

[0012] (1) This utility model has a number of columnar alloy teeth evenly spaced around the outer periphery of the cutter body, and wear-resistant strips are set in the grooves between every two columnar alloy teeth. At the same time, two rings of wear-resistant layers are symmetrically set on both ends of the cutter body. This design can significantly improve the overall wear resistance and structural stability of the cutter body, evenly distribute wear stress, avoid excessive local wear, enhance the impact resistance of the cutter body under high load and high wear conditions, and extend its service life. At the same time, through the synergistic effect of the wear-resistant layers and wear-resistant strips, thermal stress and deformation are effectively reduced, ensuring the stable operation of the cutter body under high temperature and complex working conditions, and reducing maintenance costs and production losses. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0014] Figure 1 This is the front view of this utility model.

[0015] Figure 2 This is the left view of this utility model.

[0016] Figure 3 This is a plan view of the present invention.

[0017] Figure 4 This is an enlarged view of utility model A.

[0018] Explanation of icon numbers:

[0019] 10. Blade body; 20. Columnar alloy teeth; 30. Induction coil; 40. Wear-resistant layer; 50. Groove; 60. Wear-resistant strip. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Therefore, the following detailed description of the embodiments of this utility model provided in the accompanying drawings is not intended to limit the scope of the claimed utility model, but merely to represent selected embodiments of this utility model.

[0021] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0022] Reference Figure 1-4 As shown, a novel wear-resistant toothed cutter ring includes...

[0023] Blade body 10;

[0024] A plurality of cylindrical alloy teeth 20 are evenly spaced and arranged around the outer periphery of the cutter body 10; the cylindrical alloy teeth 20 are either spherical crown alloy teeth or flat crown alloy teeth. This design does not impose any limitations, and appropriate cylindrical alloy teeth 20 can be selected according to actual needs.

[0025] Two wear-resistant layers 40 are symmetrically arranged on both ends of the cutter body 10. The reason for this arrangement is that during operation, the two ends of the cutter body 10 are usually subjected to uneven wear stress. If only one wear-resistant layer is set, the wear stress may be concentrated in a certain area, accelerating local wear. Therefore, setting two wear-resistant layers 40 can evenly distribute the wear stress, avoid excessive local wear, and extend the service life of the cutter body 10.

[0026] The wear-resistant layer 40 has a thickness of 3-5mm, and the width between the inner and outer rings of the wear-resistant layer 40 along the radial direction of the blade body 10 is 1 / 10 to 1 / 8 of the radius of the blade body 10; the outer edge of the wear-resistant layer 40 has a distance D from the outer circumference of the blade body 10, where 3mm≤D≤5mm, which can ensure that the wear-resistant layer 40 covers the main wear area of ​​the blade body 10, while avoiding material waste due to excessive width.

[0027] When the wear-resistant layer 40 is 3-5mm thick, it can provide sufficient wear resistance without significantly increasing the weight of the blade body 10. If it is too thin, it may result in insufficient wear resistance, while if it is too thick, it may increase the inertia of the blade body 10 and affect its performance.

[0028] Wear-resistant strips 60 are disposed within grooves 50, which are equally spaced around the outer circumference of the blade body 10 and between every two cylindrical alloy teeth 20. The length of the wear-resistant strips 60 extending beyond both ends of the blade body 10 and beyond the outer circumference of the blade body 10 does not exceed 2mm. This prevents the wear-resistant strips 60 from breaking or falling off during operation due to excessive length, while ensuring a tight fit between the wear-resistant strips 60 and the blade body 10.

[0029] In one example, the cylindrical alloy tooth 20 is made of GD30G with an average grain size greater than 4μm.

[0030] In one example, both the wear-resistant strip 60 and the wear-resistant layer 40 are made of HPFe1200; the compressive strength of the wear-resistant layer 40 is greater than 3000MPa, and the flexural strength is greater than 1500MPa.

[0031] The outer periphery of the cutter body 10 is also provided with radial tooth holes for mounting the cylindrical alloy teeth 20.

[0032] There is a distance B between the edge of the radial toothed hole and the wear-resistant strip 60, where 3mm ≤ B ≤ 15mm. This is because during brazing, the induction coil 30 heats the radial toothed hole and the cylindrical alloy tooth 20 to temperatures as high as 900-950℃. If the distance between the edge of the radial toothed hole and the wear-resistant strip 60 is too small (e.g., less than 3mm), the heated area may overlap with the heat-affected zone of the wear-resistant strip 60, leading to a decrease in the material properties of the wear-resistant strip 60 (e.g., reduced hardness or cracking), affecting its wear resistance and service life. Therefore, when B ≥ 3mm, it prevents the heat-affected zone from overlapping, protecting the performance of the wear-resistant strip 60. Simultaneously, it avoids stress concentration, improves the strength and reliability of the tool body 10, ensures brazing quality, and enhances the bonding strength of the cylindrical alloy tooth 20.

[0033] Each of the radial toothed holes has a brazing filler metal sheet at its bottom. The brazing filler metal sheet has a thickness of 0.5-0.7 mm and a diameter smaller than the diameter of the radial toothed hole. Further, the diameter of the brazing filler metal sheet is 0.4-0.6 mm smaller than the diameter of the radial toothed hole. Furthermore, the design of the thickness and diameter of the brazing filler metal sheet ensures that the brazing filler metal, after melting, can fully fill the gap between the columnar alloy tooth 20 and the radial toothed hole, forming a strong bond. Too thin or too small a brazing filler metal may result in insufficient bond strength, while too thick or too large a brazing filler metal may affect the installation accuracy of the columnar alloy tooth 20.

[0034] Both the radial toothed holes and the cylindrical alloy teeth 20 are uniformly coated with flux. The diameter of the radial toothed holes is larger than the diameter of the cylindrical alloy teeth 20. Furthermore, the diameter of the radial toothed holes is 0.1-0.15 mm larger than the diameter of the cylindrical alloy teeth 20, thereby ensuring that the brazing filler metal can uniformly fill the gaps, while avoiding weak bonding due to excessively large gaps or installation difficulties due to excessively small gaps.

[0035] An induction coil 30 is arranged around one side of the cutter body 10. It is used to connect to a medium-frequency brazing induction device and heat the columnar alloy tooth 20. The heating temperature of the induction coil 30 is 900-950℃, thereby melting the brazing copper sheet. At the same time, a copper hammer is used to strike the crown of the columnar alloy tooth 20, so that the molten brazing metal fills the gap between the columnar alloy tooth 20 and the radial tooth hole, thereby brazing the columnar alloy tooth 20 into the radial tooth hole.

[0036] In one embodiment, during the brazing process, a gradient heating method can be adopted, that is, the radial tooth hole is preheated first, and then the temperature is gradually increased to the brazing temperature (900-950℃) to reduce the influence of thermal stress on the tool body 10, avoid deformation or cracking of the tool body 10, and improve the brazing quality.

[0037] This embodiment also includes a method for manufacturing a novel wear-resistant toothed cutter ring, the steps of which are as follows:

[0038] S1. Multiple grooves 50 are machined on the outer circumference of the cutter body 10. All grooves 50 are opened along the axial direction of the cutter body 10 and extend to both ends of the cutter body 10. All grooves 50 have the same width and are evenly spaced along the circumference of the cutter body 10.

[0039] S2. Wear-resistant strips 60 are welded in grooves 50. Each groove 50 has a wear-resistant strip 60 welded along the length direction. The length of the wear-resistant strip 60 extending beyond the two end faces of the cutter body 10 and the length of the wear-resistant strip 60 extending beyond the outer circumference of the cutter body 10 do not exceed 2mm.

[0040] S3. Two wear-resistant layers 40 are symmetrically welded on both ends of the blade body 10. The thickness of the wear-resistant layer 40 is 3-5mm. The width between the inner and outer rings of the wear-resistant layer 40 along the radial direction of the blade body 10 is 1 / 10 to 1 / 8 of the radius of the blade body 10. The distance between the outer edge of the wear-resistant layer 40 and the outer circumference of the blade body 10 is 3-5mm.

[0041] S4. A radial tooth hole for mounting the columnar alloy tooth 20 is machined on the outer circumference of the cutter body 10. A tooth hole is machined between each two adjacent wear-resistant strips 60. The distance between the edge of the tooth hole and the wear-resistant strip 60 is greater than 3mm.

[0042] S5. Fit the blade body 10 onto a horizontally positioned rotating shaft. The outer circumference of the rotating shaft matches the inner hole of the blade body 10, so that the blade body 10 is placed in a horizontal position along the axis and can rotate synchronously with the rotating shaft.

[0043] S6. Place the induction coil 30 on one side of the cutter body 10 so that the induction coil 30 can heat the tooth hole on one side of the cutter body 10 simultaneously in the radial and axial directions. The distance between the induction coil 30 and the two end faces of the cutter body 10 is 3-5cm, and the distance between the induction coil 30 and the outer circumference of the cutter body 10 is 1-2cm. This improves heating efficiency, reduces energy loss, and ensures the uniformity of brazing temperature.

[0044] S7. Place a piece of brazing copper sheet (not shown in the figure) at the bottom of one of the tooth holes of the tool body 10. The thickness of the brazing copper sheet is 0.5-0.7mm, and the diameter of the brazing copper sheet is 0.4-0.6mm smaller than the diameter of the tooth hole. Apply flux evenly to the inner wall of the tooth hole. Select a columnar alloy tooth 20 and apply flux evenly to the surface of the columnar alloy tooth 20. Insert the columnar alloy tooth 20 into the tooth hole. The diameter of the columnar alloy tooth 20 is 0.4-0.6mm smaller than the diameter of the tooth hole. 1-0.15mm, so that the columnar alloy tooth 20 and the tooth hole are in clearance fit. Rotate the cutter body 10 until the columnar alloy tooth 20 is in the position corresponding to the induction coil 30. Start the medium frequency brazing induction equipment to heat to 900-950℃ through the induction coil 30, so that the brazing copper sheet melts. At the same time, use a copper hammer to strike the tooth crown of the columnar alloy tooth 20, so that the molten brazing metal fills the gap between the columnar alloy tooth 20 and the tooth hole, thereby brazing the columnar alloy tooth 20 into the tooth hole.

[0045] S8. Repeat the operation in S7, and braze a cylindrical alloy tooth 20 in each of the tooth holes of the cutter body 10 in sequence, so that there is a gap of 0.2-0.3mm between the bottom of the crown of the cylindrical alloy tooth 20 and the outer circumference of the cutter body 10, and make the length of the part of all cylindrical alloy teeth 20 outside the tooth hole equal, thus completing the production of the wear-resistant insert tooth cutter ring.

[0046] In step S8, the bottom of the cylindrical alloy tooth 20 crown and the outer circumference of the cutter body 10 are designed with a gap of 0.2-0.3mm to ensure that the cylindrical alloy tooth 20 can withstand sufficient impact force during operation, while avoiding stress concentration due to excessive gap or uneven wear due to insufficient gap.

[0047] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A novel wear resistant tipped cutter ring characterized in that, Comprising a cutter body (10) ; a plurality of columnar alloy teeth (20) equidistantly arranged around the outer periphery of the cutter body (10) ; two circles of wear-resistant layers (40) symmetrically arranged on the two end faces of the cutter body (10) ; a plurality of grooves (50) equidistantly arranged around the outer periphery of the cutter body (10) and between every two columnar alloy teeth (20), and a wear-resistant strip (60) arranged inside the plurality of grooves (50).

2. A new type of wear-resistant insert ring according to claim 1, characterized in that, The outer periphery of the cutter body (10) is further provided with radial tooth holes for mounting the columnar alloy teeth (20).

3. A new type of wear-resistant insert ring according to claim 2, characterized in that, The edge of the radial tooth hole and the wear-resistant strip (60) have a distance B, 3mm≤B≤15mm.

4. A new type of wear-resistant insert ring according to claim 1, characterized in that, The thickness of the wear-resistant layer (40) is 3-5mm, and the width of the wear-resistant layer (40) between the inner and outer circles along the radial direction of the cutter body (10) is 1 / 10-1 / 8 of the radius of the cutter body (10).

5. A new type of wear-resistant insert ring according to claim 1, characterized in that, The outer edge of the outer circle of the wear-resistant layer (40) and the outer periphery of the cutter body (10) have a distance D, 3mm≤D≤5mm.

6. A new type of wear-resistant insert ring according to claim 2, characterized in that, The bottom of any radial tooth hole is provided with a brazing copper sheet, the thickness of the brazing copper sheet is 0.5-0.7mm, and the diameter of the brazing copper sheet is smaller than the diameter of the radial tooth hole.

7. A new type of wear-resistant insert ring according to claim 2, characterized in that, The radial tooth hole and the columnar alloy tooth (20) are uniformly coated with a flux, and the diameter of the radial tooth hole is larger than the diameter of the columnar alloy tooth (20).

8. A new type of wear-resistant insert ring according to claim 1, characterized in that, An induction coil (30) is arranged around one side of the cutter body (10), which is used to connect a medium-frequency brazing induction device and heat the columnar alloy teeth (20).

9. A new type of wear-resistant insert ring according to claim 1, characterized in that, The columnar alloy teeth (20) are spherical crown alloy teeth or flat crown alloy teeth.

10. A new type of wear-resistant insert ring according to claim 8, characterized in that, The heating temperature of the induction coil (30) is 900-950℃.

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