Wide amplitude cycloid tooth profile multi-head cutter type cutting pick and drum

Abstract

The present application relates to a long-amplitude cycloid tooth-shaped multi-head cutter pick and a drum, the multi-head cutter pick is provided with a plurality of cutter head bodies, the blade curve of the cutter head body is a long-amplitude cycloid, the plurality of cutter head bodies are arranged at intervals, and the cutter head bodies are made of tungsten carbide; the 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 spiral extending blade is fixed on the outer cylindrical surface of the drum body, the tooth seats are dispersedly arranged on the end disc and the blade, one cutter pick is arranged on each tooth seat, and part or all of the cutter picks adopt the long-amplitude cycloid tooth-shaped multi-head cutter pick. The contact area of the cutter pick with the ore rock body is increased by nearly ten times or more than ten times, so that the pressure intensity borne by the cutter head of the cutter pick is significantly reduced, the cutter head body with a higher blade curve can continue to be used after the cutter head body with a lower blade curve is worn, and the service life of the cutter 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 on which such cutting tooth is installed, wherein the cutting tooth is in particular a multi-head cutter type cutting tooth with a long 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 multi-head cutting tooth and 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 multi-head cutting tooth with a long cycloidal tooth shape, on which multiple cutting heads are mounted, the cutting edge of each cutting head being a long cycloidal curve.

[0007] The cutting edge curves of each cutter head are located on different parallel planes. The height of the cutting edge curves of each cutter head is different. The higher the cutting edge curve, the longer the cutting edge curve. The front end of the cutting edge curve is further forward. There is a gap between each cutter head in the extension direction of the cutting edge curve.

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

[0009] The cutter head body is made of tungsten carbide.

[0010] The cutter head body is brazed onto the cutter body of the blade-shaped cutting tooth.

[0011] Preferably, 2-3 cutter heads are provided.

[0012] The long width cycloid is a base circle with a diameter of R, which rolls along the X-axis direction at a rotational speed of n while superimposing a speed of v o The trajectory of any point on the long width cycloid when translating along the X-axis direction, assuming that the initial position of the center of the base circle is at the coordinate origin, and the base circle rolls counterclockwise, the curve equation of the long width cycloid corresponding to the reference point, which is the intersection of the base circle and the positive half-axis of the Y-axis, in the plane rectangular coordinate system XY is:

[0013]

[0014] Wherein, x and y are the coordinates of a point on the long width cycloid.

[0015] The base circle diameter R of the blade curve of the highest blade head body of the long width cycloid is the diameter of the drum on which the blade type cutting tooth is located, the R of the blade curve of other blade head bodies is smaller than the diameter of the drum on which the blade type cutting tooth is located, and the smaller the R of the blade curve of the lower blade head body is.

[0016] n is the rotational speed of the drum on which the blade type cutting tooth is located.

[0017] v o The traction speed of the mining machine on which the blade type cutting tooth is located is taken.

[0018] t is time.

[0019] 2πnt is the angle θ of the reference point when t.

[0020] After sorting according to the height of the blade curve, the difference between the radii of the base circles corresponding to the blade curves of adjacent two heights is preferably greater than or equal to the average feed amount of the blade type cutting tooth.

[0021] A drum comprises a drum body and a plurality of tooth seats and blade type cutting teeth, one end of the drum body is fixed with an end disc, a spiral extending blade 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 blade type cutting tooth is installed on each tooth seat, and part or all of the blade type cutting teeth adopt the long width cycloid tooth profile multi-head blade type cutting tooth.

[0022] The extension direction of the blade curve of the blade head body is arranged along the circumferential direction of the drum body, the front end of the blade head body is close to the front of the drum rotation direction, the rear end of the blade head body is close to the rear of the drum rotation direction, for any blade head body, the end of the blade curve with a higher height is close to the front of the drum rotation direction, and the end of the blade curve with a lower height is close to the rear of the drum rotation direction.

[0023] The beneficial effects of the present application are:

[0024] Since any point on the blade of the cutter picks rotates around the axis of the drum while the mining (coal) machine advances horizontally, the trajectory of the point is a long-amplitude cycloid, so the blade curve of the cutter head body of the cutter pick adopts a long-amplitude cycloid, so that the entire blade curve can be in contact with the cut coal rock at all times during the rotation of the cutter pick, so the contact area between the cutter head body of the cutter pick and the coal rock is increased by nearly ten times or more than ten times compared with the conventional conical or pyramid-shaped cutter head body, so that the pressure on the blade of the cutter head body of the cutter pick 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 is significantly prolonged.

[0025] Since a plurality of cutter head bodies are arranged on the cutter pick, when the cutter head body with the highest blade curve is worn out, the cutter head body with the second highest blade curve can continue to be used without being affected, when the other cutter head bodies are worn out, the cutter head body with the lowest blade curve can continue to be used, and so on, so that the service life of the long-amplitude cycloid tooth-shaped multi-head cutter pick is significantly increased. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a structural schematic view of a conventional cutter pick;

[0027] Figure 2 is a structural schematic view of an embodiment of the cutter pick of the application;

[0028] Figure 3 is a schematic view of the long-amplitude curve;

[0029] Figure 4 is a structural schematic view of an embodiment of an assembly composed of the cutter pick and the tooth seat of the application;

[0030] Figure 5 is a structural schematic view of an embodiment of a drum provided with the cutter pick of the application;

[0031] Figure 6 is Figure 5 an axial view of

[0032] Fig. 1 is a structural schematic view of a conventional cutter pick; DETAILED DESCRIPTION

[0033] The application discloses a long-amplitude cycloid tooth-shaped multi-head cutter pick (which can be simply referred to as a multi-head cutter pick), as shown in Figure 2 , 3 which is provided with a plurality of cutter head bodies 2, and the blade curve 2-1 of the cutter head body is a small section of a long-amplitude cycloid.

[0034] Because the tips of the cutting teeth rotate around the cylinder axis while simultaneously moving horizontally with the mining (coal) machine, their trajectory is a long-amplitude cycloid. Therefore, the use of a long-amplitude cycloid curve in the cutting edge curve of the cutter head of this invention ensures that the entire curved arc of the cutting tooth remains in contact with the ore (coal) rock being cut during rotational cutting. The contact area between the cutting tooth and the ore (coal) rock in this invention is nearly ten times or more than ten times larger than that of conventional conical or pyramidal cutter heads, thus reducing the pressure on the long-amplitude cycloid curved arc cutter head and significantly increasing its service life.

[0035] The cutting edge curves of each cutter head lie on different parallel planes, and the height of each cutter head's cutting edge curve varies. The height of the cutting edge curve refers to its distance from the central axis of the roller; the greater the distance, the higher the cutting edge curve. The higher the cutting edge curve, the longer the cutting edge curve. If we call the ends of the cutter head corresponding to the two ends of the cutting edge curve the front and rear ends, the front end of the cutter head with the higher cutting edge curve is further forward. Along the extension direction of the cutting edge curve, there is a gap between each cutter head. Furthermore, on the same cutting edge curve, the end with the higher height is the front end, and the end with the lower height is the rear end.

[0036] In this way, the cutter head with the higher cutting edge curve participates in cutting first. When it wears out, the cutter head with the lower cutting edge curve can continue to be used without being affected, thus significantly increasing the service life of the long-amplitude cycloidal tooth multi-head cutting tooth. By setting the cutting edge curve length of the cutter head with a lower cutting edge curve height to be shorter, and by setting a gap between each cutter head in the direction of the cutting edge curve extension, it is easier for the cutter head with the lower cutting edge curve to enter the cutting process.

[0037] The cutter head body can be made of cemented carbide.

[0038] Furthermore, the cutter head body is preferably made of tungsten carbide.

[0039] The cutter head body is typically brazed onto the cutter body of the blade-shaped cutting tooth.

[0040] Preferably, 2-3 cutter heads are provided.

[0041] like Figure 3 As shown, in the Cartesian coordinate system XY, the long-amplitude cycloid can be regarded as a base circle with diameter R rolling along the X-axis at a rotational speed n, while simultaneously being superimposed with a speed v. oThe trajectory of any point on the long amplitude trochoid when it is translated along the X-axis direction 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, and 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 trochoid corresponding to the reference point in the plane rectangular coordinate system.

[0042]

[0043] Wherein, x and y are the coordinates of a point on the long amplitude trochoid;

[0044] t is time;

[0045] 2πnt is the angle θ turned by the reference point at time t.

[0046] Specifically, in the long amplitude trochoid tooth profile multi-head cutter type cutting tooth of the present application, the base circle diameter R of the blade curve of the cutter head body with the highest blade curve is the diameter of the drum where the cutter type cutting tooth is located, the R of the blade curve of the other cutter head bodies is smaller than the diameter of the drum where the cutter type cutting tooth is located, and the smaller the R of the blade curve of the cutter head body with the lower blade curve is. o The n is the rotating speed of the drum where the cutter type cutting tooth is located, and v

[0047] It can be seen that the long amplitude trochoid is mainly determined by the diameter of the drum of the mining machine where the corresponding long amplitude trochoid tooth profile multi-head cutter type cutting tooth is located, the rotating speed of the drum, and the traction speed of the mining machine.

[0048] As for the specific arc length of the blade curve, it is mainly determined according to the one-way cutting force of the cutting tooth on the corresponding drum. The blade curve is longer and more wear-resistant, but the resistance received by the cutting is also increased accordingly, so the size of the cutting power also needs to be considered to finally determine the arc length of the blade curve.

[0049] After sorting the blade curves according to their heights, the difference between the radii of the base circles corresponding to the blade curves of two adjacent heights is preferably greater than or equal to the average feed amount of the cutter type cutting tooth, for example, 16 mm.

[0050] The cutter type cutting tooth of the present application can also be used for a coal mining machine drum, and is particularly suitable for cutting gangue or fault and other harsh working conditions.

[0051] The present application also discloses a drum, as shown in Figures 4-6 The drum body 3 has an end disc 5 fixed at one end, and a spiral extending blade 6 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 cutting tooth is installed on each tooth seat. Part or all of the cutter type cutting teeth adopt the long amplitude trochoid tooth profile multi-head cutter type cutting tooth. Figure 5、 6 Only one cutter pick and the installation of the corresponding tooth seat are shown in the figure, which is only to express the installation position and direction of the cutter pick according to the present application.

[0052] The extension direction of the blade curve of the cutter head body of the cutter pick according to the present application is arranged along the circumferential direction of the drum body, and the front end of the cutter head body is close to the front in the drum rotation direction, and the rear end of the cutter head body is close to the rear in the drum rotation direction. That is, when the drum is cutting, the cutter head body with a higher blade cuts into the ore first, and the cutter head body with a lower blade cuts into the ore later. Further, for a single cutter head body, it is preferred that the end with a higher blade curve is close to the front in the drum rotation direction, and the end with a lower blade curve is close to the rear in the drum rotation direction.

Claims

1. A long-amplitude cycloidal toothed multi-head cutting tool, characterized in that: Multiple cutter heads are mounted on it. The cutting edge curve of each cutter head is a long cycloid. The cutting edge curves of each cutter head are located on different parallel planes. The height of the cutting edge curves of each cutter head is different. The higher the cutting edge curve, the longer the cutting edge curve and the more forward the front end of the cutting edge curve. There is a gap between each cutter head in the extension direction of the cutting edge curve. The long cycloid is a base circle with a diameter of 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: Where x and y are the coordinates of a point on the long-amplitude cycloid; The base circle diameter R of the cutting edge curve of the cutting edge body with the highest cutting edge curve is taken as the diameter of the roller where the cutting teeth are located. The R of the cutting edge curve of other cutting edge bodies is smaller than the diameter of the roller where the cutting teeth are located, and the lower the cutting edge curve of the cutting edge body, the smaller the R of its cutting edge curve. n is the rotational speed of the roller where the blade-shaped cutting teeth are located; v o Take the traction speed of the mining machine where the cutting edge is located; t represents time; 2πnt is the angle θ through which the reference point rotates at time t.

2. The long-amplitude cycloidal multi-head cutting tooth as described in claim 1, characterized in that: The cutter head body is made of cemented carbide.

3. The long-amplitude cycloidal multi-head cutting tooth as described in claim 2, characterized in that: The cutter head body is made of tungsten carbide.

4. The long-amplitude cycloidal multi-head cutting tooth as described in claim 3, characterized in that: The cutter head body is brazed onto the cutter body of the blade-shaped cutting tooth.

5. The long-amplitude cycloidal multi-head cutting tooth as described in claim 4, characterized in that: The cutter head has 2-3 parts.

6. The long-amplitude cycloidal multi-head cutting tooth as described in claims 1, 2, 3, 4 or 5, characterized in that: After sorting the cutting edge curves by height, the difference in the radius of the base circle corresponding to the two adjacent cutting edge curve heights is at least equal to the average feed rate of the cutting edge teeth.

7. A roller, characterized in that: It includes a roller body and several tooth holders and blade-shaped cutting teeth. One end of the roller body is fixed with an end plate, and spirally extending blades are fixed on the outer cylindrical surface of the roller body. The tooth holders are distributed on the end plate and the blades. Each tooth holder is equipped with a blade-shaped cutting tooth. Some or all of the blade-shaped cutting teeth are long-amplitude cycloidal tooth multi-head blade-shaped cutting teeth as described in claims 1, 2, 3, 4, 5 or 6.

8. The roller as described in claim 7, characterized in that: The extension direction of the cutting edge curve of the cutter head body is arranged along the circumference of the roller body, and the front end of the cutter head body is close to the front of the roller rotation direction, and the rear end of the cutter head body is close to the rear of the roller rotation direction. For any cutter head body, the end with the higher cutting edge curve is close to the front of the roller rotation direction, and the end with the lower cutting edge curve is close to the rear of the roller rotation direction.

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