Alloy coal cutting tooth for coal mining

Abstract

The utility model relates to the technical field of coal mining equipment, and particularly discloses an alloy coal cutting tooth for coal mining. The tooth comprises a tooth tip, and the tooth tip is composed of a root spiral conical surface, a middle spiral conical surface and a tip spiral conical surface. The tooth tip is designed into a three-section variable angle, and the front angle of the tooth tip is sequentially increased from the root to the tip, so that the tooth tip can adapt to different coal caving rules. And the lead angle is 25-30 degrees, so that the adhesion of pulverized coal can be reduced, and the cutting resistance is reduced by 12-15%. And the single-tooth cutting amount can be increased to 1.8 times of that of a traditional cutting tooth.

Description

TECHNICAL FIELD

[0001] The utility model relates to coal mining equipment technical field, especially alloy coal cutting tooth for coal mining. BACKGROUND

[0002] With the continuous use of large-scale coal mining machinery in coal mining production, coal mining machines and well drilling machines have gradually replaced the original ball tooth drill bits, and the coal cutting teeth are widely used in coal mining machinery, which are favored by users due to the characteristics of economic applicability and raw material saving.

[0003] The current coal cutting tooth has the following problems when cutting hard coal or gangue: 1. Large cutting resistance: the traditional cutting tooth edge is of a single angle, which easily leads to poor coal body collapse; 2. Abrasion layer is easy to fall off: the surface coating and the base body have insufficient bonding strength, which fails after long-term use. UTILITY MODEL CONTENTS

[0004] The utility model provides alloy coal cutting tooth for coal mining with small cutting resistance to make up for the defects of prior art.

[0005] The utility model is realized through the following technical schemes:

[0006] An alloy coal cutting tooth for coal mining, comprising a tooth body, the tooth body comprising a tooth tip, characterized in that the tooth tip is a spiral cone surface composed of three conical surfaces of a root portion, a middle portion and a tip portion, and the rake angles of the root portion, the middle portion and the tip portion increase in turn.

[0007] The rake angles of the three conical surfaces are 15°, 18° and 20° in turn from the root portion to the tip portion.

[0008] The spiral angle is 25°-30°.

[0009] The tooth body surface is covered with a coating, and the coating is of a gradient structure: the bottom layer is a NiCrAlY transition layer, and the surface layer is a WC-10Co4Cr coating.

[0010] The thickness of the bottom layer is 0.1 mm, and the thickness of the surface layer is 0.3 mm.

[0011] The tooth body is connected with the cutter holder through a conical positioning pin, the positioning pin is made of GCr15, and the hardness is HRC58-62.

[0012] The lengths of the root portion, the middle portion and the tip portion account for 30%, 40% and 30% of the tooth tip degree respectively.

[0013] The utility model has the advantages that:

[0014] The tooth tip is designed to be a three-section variable-angle type, the rake angles of which increase in turn from the root portion to the tip portion, and it can adapt to different coal body collapse rules.

[0015] The helix angle is 25-30°, which can reduce the adhesion of coal powder and reduce the cutting resistance by 12-15%.

[0016] The single-tooth cutting amount can be increased to 1.8 times of that of a conventional cutting tooth. BRIEF DESCRIPTION OF DRAWINGS

[0017] The utility model will be further described in connection with the drawings:

[0018] Fig. 1 It is the front structure schematic diagram of the utility model;

[0019] Fig. 2 It is the section structure schematic diagram of the utility model.

[0020] In the drawing, 1 tooth body, 2 tooth tip, 201 root, 202 middle part, 203 tip, 3 positioning pin, 4 helix, alpha rake angle. DETAILED DESCRIPTION

[0021] The drawings are specific embodiments of the utility model.

[0022] In order to more clearly understand the above purpose, features and advantages of the utility model, the utility model will be further described in detail in connection with the drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0023] In the following description, a lot of specific details are set forth in order to fully understand the utility model, however, the utility model can also be implemented in other ways different from the description herein, therefore, the protection scope of the utility model is not limited by the specific embodiments disclosed below.

[0024] As Figs. 1-2 The alloy coal cutting tooth for coal mining, as shown in the drawing, comprises a tooth body 1, and the tooth body 1 comprises a tooth tip 2 composed of a helical taper surface formed by three taper surfaces:

[0025] The root 201 accounts for 30% of the length of the tooth tip 2, and the rake angle alpha is 15°, which provides stable support and prevents large coal blocks from falling off in the initial cutting stage, and enhances the bending strength of the tooth tip 2.

[0026] The middle part 202 accounts for 40% of the length of the tooth tip 2, and the rake angle alpha is 18°, which balances the cutting resistance and the coal powder discharge efficiency, and adapts to the falling law of the medium cutting depth coal body.

[0027] The tip 203 accounts for 30% of the length of the tooth tip 2, and the rake angle alpha is 20°, which improves the sharpness and reduces the cutting specific energy consumption, and promotes the sliding discharge of the coal powder along the taper surface.

[0028] The helical taper has a helical angle of 25-30 degrees.

[0029] The helix 4 can be a protrusion or a groove.

[0030] The tooth body 1 is connected with the tool holder through the conical positioning pin 3, and the interference amount is 0.02-0.05mm, the positioning pin 3 is made of GCr15, and the hardness is HRC58-62.

[0031] The tooth body 1 is coated with a coating, and the coating is a gradient structure composed of a bottom layer and a surface layer, wherein the bottom layer is a NiCrAlY transition layer with a thickness of 0.1mm; the surface layer is a WC-10Co4Cr coating with a thickness of 0.3mm.

[0032] In the present application, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "a plurality of" refers to two or more than two, unless otherwise explicitly limited. The terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integrally connected; "connected" can be directly connected, or indirectly connected through an intermediate medium. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", "front", "back" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or units referred to must have a particular direction, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0034] In the description of the present application, the terms "one embodiment", "some embodiments", "a specific embodiment" and the like mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0035] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. 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.

[0036] All other technical features not described in the specification are known to those skilled in the art.

Claims

1. An alloy coal cutting pick for coal mining comprising a pick body (1) comprising a pick tip (2), characterized in that, The tooth tip (2) is a spiral cone surface composed of three conical surfaces of a root (201), a middle part (202) and a tip (203), and the rake angles (α) of the root (201), the middle part (202) and the tip (203) are increased in turn.

2. The alloy coal cutting pick for coal mining according to claim 1, characterized by The rake angles (α) of the three conical surfaces are 15°, 18° and 20° in turn from the root (201) to the tip (203).

3. The alloy coal cutting pick for coal mining according to claim 1, characterized in that, The helix angle is 25°-30°.

4. The alloy coal cutting pick for coal mining according to claim 1, characterized by The tooth body (1) is coated with a coating, and the coating is a gradient structure: the bottom layer is a NiCrAlY transition layer, and the surface layer is a WC-10Co4Cr coating.

5. The alloy coal cutting pick for coal mining according to claim 4, characterized in that, The thickness of the bottom layer is 0.1 mm, and the thickness of the surface layer is 0.3 mm.

6. The alloy coal cutting pick for coal mining according to claim 1, characterized by The tooth body (1) is connected with the tool holder through a conical positioning pin (3), the positioning pin (3) is made of GCr15, and the hardness is HRC58-62.

7. The alloy coal cutting pick for coal mining according to claim 1, characterized by The lengths of the root (201), the middle part (202) and the tip (203) account for 30%, 40% and 30% of the length of the tooth tip (2) respectively.

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