Long-stroke cycloid tooth single-head cutter type cutting pick and roller

Abstract

The present application relates to a long-amplitude cycloid tooth single-head cutter type pick and drum, the single-head cutter type pick is provided with a cutter head body, the blade curve of the cutter head body is long-amplitude cycloid, the cutter head body is generally made of tungsten carbide; the drum includes a drum body and a plurality of tooth seats and cutter type picks, one end of the drum body is fixed with an end disc, the outer cylindrical surface of the drum body is fixed with helically extending blades, the cutter type picks are dispersedly arranged on the tooth seats of the end disc and the blades, part or all of the cutter type picks adopt the long-amplitude cycloid tooth single-head cutter type pick. The contact area of the cutter type pick with the ore rock body is increased by nearly ten times or more than ten times compared with the conventional conical or pyramid cutter head, so that the pressure intensity borne by the cutter type pick cutter head is significantly reduced, and the service life of the cutter type pick cutter head and even the corresponding drum is obviously prolonged.

Description

Technical Field

[0001] The present invention relates to a cutting tooth for a mining (coal) machine drum and a drum equipped with such a cutting tooth, wherein the cutting tooth is in particular a single-headed blade-type cutting tooth with a long-amplitude cycloidal tooth shape. Background Technology

[0002] Cutting teeth are widely used on the drums of mining (coal) machinery and are key and vulnerable parts of the cutting actuators in mining (coal) machinery. Cutting teeth act directly on the ore and rock mass to break and cut off the ore and rock, and their structural performance directly affects the production capacity and efficiency of mining (coal) machinery.

[0003] The cutting tip 1 of a conventional cutting tool is a cone or pyramid inlaid with hard alloys such as tungsten carbide, such as... Figure 1 As shown. The embedded alloy cone needs to have sufficient strength and good wear resistance, and maintain good adhesion with the cutting tooth body. Conventional cutting teeth with conical or pyramidal tips are acceptable for use in soft rock machinery such as coal mining machines, but their wear is extremely high when used for cutting hard rock. The main reasons for their rapid wear are: first, compared to coal, most hard rock has incomplete joint development, meaning it is essentially an isotropic material, and the cutting tooth tip is constantly in contact with the rock mass during cutting; second, the conical or pyramidal carbide tip is too small, resulting in extremely high local stress. Summary of the Invention

[0004] The present invention aims to provide a long-amplitude cycloidal toothed single-headed cutting tooth and a roller, which can significantly improve the service life and can be used for cutting hard rocks.

[0005] The main technical solutions of this invention are as follows:

[0006] A long-amplitude cycloidal toothed single-headed cutting tooth is provided, on which a cutting head body is mounted, the cutting edge of which is a long-amplitude cycloidal curve.

[0007] The cutter head body is made of cemented carbide.

[0008] The cutter head body is made of tungsten carbide.

[0009] The cutter head body is brazed onto the cutter body of the blade-shaped cutting tooth.

[0010] The long-amplitude cycloid is a base circle with diameter R that rolls purely along the X-axis at a rotational speed n, while simultaneously being superimposed with a speed v. o The trajectory traced by any point on the base circle during translation along the X-axis, assuming the initial position of the center of the base circle is at the origin, and the base circle rolls counterclockwise, the equation of the long-amplitude cycloid corresponding to the intersection of the base circle and the positive Y-axis (i.e., the reference point) in the Cartesian coordinate system XY is:

[0011]

[0012] wherein x, y are the coordinates of a point on the long amplitude cycloid;

[0013] R is the diameter of the drum where the cutter picks are located;

[0014] n is the rotational speed of the drum where the cutter picks are located;

[0015] v o v is the traction speed of the mining machine where the cutter picks are located;

[0016] t is time.

[0017] 2πnt is the angle θ turned by the reference point at time t.

[0018] A drum comprises a drum body, a plurality of tooth seats and cutter picks, one end of the drum body is fixed with an end disc, a helically extending vane is fixed on the outer cylindrical surface of the drum body, the tooth seats are dispersedly installed on the end disc and the vane, one cutter pick is installed on each tooth seat, and part or all of the cutter picks adopt the long amplitude cycloid single-head cutter pick.

[0019] The extension direction of the blade curve of the cutter head body is arranged along the circumferential direction of the drum body, and the higher end of the blade curve is close to the front in the rotation direction of the drum, and the lower end of the blade curve is close to the rear in the rotation direction of the drum.

[0020] The beneficial effects of the present application are:

[0021] Since any point on the cutter pick rotates around the drum axis on the drum while the mining (coal) machine horizontally advances, the motion trajectory is a long amplitude cycloid, therefore, the blade curve of the cutter head body of the cutter pick of the present application adopts the long amplitude cycloid, so that the entire blade curve can always maintain contact friction with the cut coal rock body during rotary cutting of the coal rock, therefore, the contact area between the cutter head body of the cutter pick of the present application and the coal rock body is increased by nearly ten times or more than ten times than that of the conventional conical or pyramid-shaped cutter head body, so that the pressure on the blade part of the cutter head body of the cutter pick of the present application is significantly reduced, the severe wear of the cutter pick is reduced, and the service life of the cutter head body of the cutter pick of the present application is obviously prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of a conventional cutter pick;

[0023] Figure 2 is a structural schematic view of an embodiment of the cutter pick of the present application;

[0024] Figure 3 is a schematic view of the long amplitude curve;

[0025] Figure 4 is a structural schematic view of an embodiment of the assembly of the pick and the tooth seat of the present application;

[0026] Figure 5 is a structural schematic view of an embodiment of the drum equipped with the pick of the present application;

[0027] Figure 6 is an axial view of Figure 5 .

[0028] Reference signs: 1. a bit of a conventional pick; 2. a bit body of the present application; 2-1. a blade curve; 3. a drum body; 4. a pick; 5. an end disc; 6. a blade; 7. a tooth seat. DETAILED DESCRIPTION

[0029] The present application discloses a long-amplitude cycloid single-head pick, as shown in Figure 2 , 3 , which is equipped with a bit body 2, and the blade curve 2-1 of the bit body is a small section of long-amplitude cycloid.

[0030] Since the tooth tip of the pick rotates around the drum axis while the mining (coal) machine advances horizontally, the trajectory of the pick is a long-amplitude cycloid, so the blade curve of the bit body of the present application adopts long-amplitude cycloid to ensure that the entire curved arc bit of the pick maintains contact with the mined (coal) rock during the rotation of the pick. The contact area of the pick of the present application with the mined (coal) rock is nearly ten times or more than ten times larger than that of the conventional conical or pyramidal bit, so the pressure on the long-amplitude cycloid curved arc bit of the pick is reduced, thereby significantly increasing the service life of the long-amplitude cycloid pick bit.

[0031] The bit body can be made of cemented carbide.

[0032] Further, the bit body is preferably made of tungsten carbide.

[0033] The bit body is usually brazed to the bit body of the pick.

[0034] As shown in Figure 3 , in the rectangular coordinate system XY, the long-amplitude cycloid can be regarded as a base circle with a diameter of R that rolls along the X-axis direction at a speed n while an arbitrary point on the base circle translates along the X-axis direction at a speed v o , and the trajectory of the arbitrary point is a spiral curve. In order to simplify the expression, it is assumed that the initial position of the center of the base circle is at the coordinate origin, the base circle rolls counterclockwise, and the trajectory of the intersection point (which can be referred to as a reference point) of the base circle and the positive half of the Y-axis is the curve equation of the long-amplitude cycloid corresponding to the reference point in the plane rectangular coordinate system, which is:

[0035]

[0036] wherein x, y are the coordinates of the point on the long-throw cycloid;

[0037] t is time;

[0038] 2πnt is the angle θ turned by the reference point at time t.

[0039] Specifically, in the long-throw cycloid tooth single-head cutter-type pick of the present application, R is the diameter of the drum where the cutter-type pick is located, n is the rotating speed of the drum where the cutter-type pick is located, and v o is the traction speed of the mining machine where the cutter-type pick is located.

[0040] It can be seen that the long-throw cycloid is determined by the diameter of the drum of the mining machine where the corresponding long-throw cycloid tooth single-head cutter-type pick is located, the rotating speed of the drum, and the traction speed of the mining machine.

[0041] As for the specific arc length of the blade curve, it is mainly determined according to the one-way cutting force of the pick on the corresponding drum. The blade curve is longer and more wear-resistant, but the resistance received by the pick is also increased accordingly due to the long cutting, so the size of the cutting power also needs to be considered to finally determine the arc length of the blade curve.

[0042] The cutter-type pick of the present application can be used for the drum of the mining machine, and is particularly suitable for cutting gangue or fault and other harsh working conditions.

[0043] The present application also discloses a drum, as shown in Figures 4-6 which comprises a drum body 3, a plurality of tooth seats 7, and a plurality of cutter-type picks 4. One end of the drum body is fixed with an end disc 5, and a helically extending blade 6 is fixed on the outer cylindrical surface of the drum body. The tooth seats are dispersedly installed on the end disc and the blade. One cutter-type pick is installed on each tooth seat. Part or all of the cutter-type picks adopt the long-throw cycloid tooth single-head cutter-type pick. The Figure 5 , 6 figure only shows the installation of one cutter-type pick and the corresponding tooth seat, and only expresses the installation position and direction of the cutter-type pick of the present application.

[0044] The extension direction of the blade curve of the cutter head body of the cutter-type pick of the present application is arranged along the circumferential direction of the drum body, and the higher end of the blade curve is close to the front in the rotating direction of the drum, and the lower end of the blade curve is close to the rear in the rotating direction of the drum, i.e. when the drum is cutting, the higher end of the blade of the cutter head body cuts into the ore first. The so-called height of the point on the blade curve refers to the distance of the point from the center axis of the drum, and the farther distance is the higher.

Claims

1. A long width cycloid single head cutter type cutting pick, characterized in that: A cutter head body is mounted thereon, and a blade part of the cutter head body is a long amplitude cycloid, which is a base circle with a diameter of R rolling along the X axis direction at a speed of n and superimposed with a speed of v o A trajectory of any point on the long amplitude cycloid when translating along the X axis direction, assuming that an initial position of a center of the base circle is on the coordinate origin and the base circle rolls counterclockwise, a curve equation of the long amplitude cycloid corresponding to a reference point, which is an intersection of the base circle and a positive half axis of the Y axis, in a plane rectangular coordinate system XY is: Wherein, x, y are the coordinates of the point on the long amplitude cycloid; R takes the diameter of the drum where the cutter tooth is located; n takes the rotating speed of the drum where the cutter tooth is located; v o taking the drawbar speed of the mining machine in which the pick is located; t is time; 2πnt is the angle θ turned by the reference point at time t.

2. The long width cycloidal single head cutter type pick according to claim 1, characterized in that: The cutter head body is made of hard alloy.

3. The long width cycloidal single head cutter type pick according to claim 2, characterized in that: The cutter head body is made of tungsten carbide.

4. The long width cycloidal single head cutter type pick according to claim 3, characterized in that: The cutter head body is brazed on the cutter body of the cutter tooth.

5. A drum, characterized by: The drum body has an end disc fixed at one end, and a spiral extending blade fixed on the outer cylindrical surface of the drum body, and a plurality of tooth seats and cutter teeth are dispersedly installed on the end disc and the blade, one cutter tooth is installed on each tooth seat, and part or all of the cutter teeth are long amplitude cycloid single-head cutter teeth according to claim 1, 2, 3 or 4.

6. The drum of claim 5, wherein: The extension direction of the blade curve of the cutter head body is arranged along the circumferential direction of the drum body, and the higher end of the blade curve is close to the front of the rotating direction of the drum, and the lower end of the blade curve is close to the rear of the rotating direction of the drum.

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