JP2015051433A - Hammer head and crush machine having hammer head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hammer head which can adjust abrasion characteristics to impact in crush or pulverization.SOLUTION: A hammer head 24 fixed on the outer periphery of a rotatable rotor to carry out crush or pulverization between a repulsion stationary knife arranged around the rotor and itself, has a body part extending over a prescribed length from the rotor toward the repulsion stationary knife. The body part consists of a casting body part with the top face on the side of the repulsion stationary knife, and keeps a hardening build-up part 36B which constitutes an impact load receiving face on the rotational directional advance side of an end part of the repulsion stationary knife and a soft steel part 38B integral with the hardening build-up part and softer than the hardening build-up part, fixed by welding on the casting body part via the soft steel part. The hardening build-up part forms a first edge 42B of the impact load receiving face and an end face crossing the impact load receiving face on the end part side. The soft steel part has a soft steel part end face adjacent to the end face and flush with the end face so as to abrade by following abrasion of the first edge of the hardening build-up part caused by the crush or the pulverization.

Description

  The present invention relates to a hammer head and a crusher having the hammer head, and more particularly, a hammer head capable of adjusting wear characteristics against impact during crushing or crushing, and crushing or crushing regardless of wear of the hammer head. The present invention relates to a crusher having the hammer head capable of controlling the particle size of an object.

2. Description of the Related Art Conventionally, a crusher or a crusher that crushes or crushes coal for coke, waste plastic, waste material and waste, concrete lump, or the like has been used.
For example, Patent Literature 1 and Patent Literature 2 disclose a crusher that crushes coal for coke.

This crusher has an inlet for charging the object to be crushed or crushed therein, a casing that forms a crushing or pulverizing space inside, a rotor that is provided in the casing, a rotatable rotor, and an outer peripheral portion of the rotor A hammer having a hammer arm fixed at one end and a hammer head fixed at the other end of the hammer arm, and a relative movement with respect to the hammer so as to ensure a predetermined interval with respect to the rotation trajectory of the hammer head The repellent fixed blade provided in a possible manner and a rotation driving means for rotating the hammer are provided, and the hammer head and the repellent fixed blade cooperate to perform crushing or crushing.
In particular, as shown in FIG. 10, the hammer head 100 has a depth of 2 mm to 10 mm on the entire surface of the short side plane 102 at the tip of the crushing side of the hammer head main body 106 and a part of the long side surface 104 subsequent thereto. A thinned portion is formed, and this thinned portion is subjected to hardening build-up welding 101 in an inverted U-shaped manner to eliminate the thinned portion.

According to the hammer head 100 having such a configuration, the entire thickness of the short side plane 102 at the front end of the crushing side of the hammer head main body 106 and a thickness reduction of 2 mm to 10 mm are formed on a part of the long side surface 104 following this. Since the thinned portion is formed by applying the hardfacing weld 101 to the thinned portion and the thinned portion disappears, the entire portion subjected to the impact is covered with the hardened welding having a sufficient thickness of 2 mm to 10 mm. be able to. In addition, since the hardfacing welding is formed in the reduced thickness portion, the end of the hardfacing welding does not protrude and does not peel off due to impact. For this reason, it is possible to maintain an excellent crushing capacity over a long period of time.
However, the following technical problems exist in the conventional hammer head and the crusher having such a hammer head.

First, regarding the hammer head 100, the hardfacing portion 101 constituting the impact receiving surface of the hammerhead 100 is worn with pulverization or crushing, but has a higher wear resistance than when no hardfacing portion is provided. Although it is possible to improve, it is difficult to adjust this wear characteristic.
More specifically, as shown in FIG. 11, the cured built-up portion 101 that receives an impact has a width direction of the cured built-up portion 101 (FIG. 11A) and a height direction of the cured built-up portion 101 (FIG. 11). (B)) Abrasion is performed in a manner in which R is generated (the progress of wear is indicated by a line). In other words, the impact receiving surface of the hardfacing portion 101 is configured in such a manner that the first edge 103 is between the end surfaces and the second edge 105 and the third edge 107 are between the opposite side surfaces, with the edges standing. However, since the constituent surfaces constituting the first edge 103, the second edge 105, and the third edge 107 are constituted by the hardened portion 101 made of the same material, these first edges 103 are formed. Both the second edge 105 and the third edge 107 are worn in such a manner that the corners are rounded.
When such a form of wear occurs, the hammerhead must be replaced, and the efficiency of crushing or crushing is impaired due to the replacement operation.

Secondly, regarding the crusher having such a hammer head 100, it is difficult to control the particle size of the object to be crushed or crushed due to the difficulty in adjusting the wear characteristics of the hammer head 100 described above.
More specifically, the repelling fixed blade is provided so as to be movable relative to the hammer so that a predetermined interval can be secured with respect to the rotation trajectory of the hammer head. The distance between the repellent fixed blade and the tip of the hammer head can be adjusted by moving the blade relative to the hammer head.

However, when the hammer head is worn in the manner shown in FIG. 11, it is technically difficult to keep the particle size of the object to be crushed constant even if the interval between the repellent fixed blade and the tip of the hammer head is adjusted. It causes variation in particle size and causes quality degradation of crushed material.
In particular, the coke coal used for iron making has strict particle size control, and in order to keep the particle size of the object to be crushed constant, if the wear of the hammer head of the above-mentioned mode occurs, the hammer head should be replaced. I must.

More specifically, the particle size adjustment has been conventionally performed by adjusting the rotation speed of the rotor and / or adjusting the distance between the hammer head and the repellent fixed blade. The former is based on the impact load receiving surface of the hammer head. It is a particle size adjustment by striking, a coarse adjustment, and the latter is a fine adjustment, and with the strictness of the particle size management, an emphasis is placed on the adjustment by the latter.
In this case, in comparison with the particle size adjustment by adjusting the rotational speed of the rotor, in the case of the particle size adjustment by adjusting the distance between the hammer head and the repulsive fixed blade, the short side plane 102 at the tip of the crushing side of the hammer head and the rotation direction advance side The first edge portion 103 is exposed to more severe wear conditions.
In this respect, there is a demand in the industry to realize a hammer head capable of adjusting the wear characteristics, and a crusher capable of controlling the particle size of an object to be crushed or crushed by such a hammer head.

Thirdly, it is difficult to efficiently manufacture a hammer head having excellent wear resistance.
More specifically, since the hardfacing welding is performed manually on a hammerhead body that is usually formed of a cast product, it is difficult to efficiently manufacture the hammerhead, and the finished hardened meat is finished. The raised portion, in particular, the impact load receiving surface is uneven and is not flat, and the third edge without the first edge is not formed in a sharp standing state, and the wear resistance of the hammerhead is reduced.

In this regard, the present inventor has proposed an impact blade body which is a hammer head having good workability and relatively low cost, as shown in Patent Document 3.
More specifically, the impact blade is composed of an impact blade body and a cemented carbide chip embedded at the tip of the impact blade body. The impact blade body is made of an impact-resistant material such as alloy steel or mild steel. Is composed of a tip end portion in which a cemented carbide chip is embedded by brazing or the like, and a base end portion having a bolt hole for attaching to a blade base of a rotating drum via a bolt (not shown). And the base end are coupled and fixed to each other by a mating coupling. Carbide inserts are made of a material with better wear resistance than the impact blade body, for example, super hard alloys, ceramics, etc., and brazed to the tip so that it tilts in the direction of rotation of the rotating drum radially outward. The sharp tip portion of the carbide tip is exposed at the boundary line between the front surface and the top surface of the tip portion.

According to this impact blade body, by separating the impact blade body into a distal end portion and a proximal end portion, brazing of the carbide tip to the distal end portion is performed in a relatively light and small and easy to handle state, Thereafter, the impact blade main body can be configured by being combined with the base end portion, so that the workability is good and a relatively low cost can be achieved as compared with the integral impact blade main body.

However, it is necessary to bury the carbide tip manually by brazing or the like at the tip, and it is difficult to efficiently manufacture the impact blade body, and the rotating drum rotates outward in the radial direction. Although it is possible to improve the wear resistance of the tip edge of the impact blade body by embedding a cemented carbide tip at the tip so as to incline in the direction, compared with the case where no cemented carbide chip is buried, The embodiment has been described in the first technical problem unless a carbide tip is provided over the entire first edge between the impact load receiving surface and the distal end surface of the impact blade body from the rotating drum. As well as causing the problem of wear out to generate rounds.
Further, in addition to the first edge, it is difficult to similarly braze the casting body portion with respect to the second edge and the third edge between the impact load receiving surface and the opposing side surfaces of the impact blade body. In particular, carbide tips contain a lot of tungsten components, so they have excellent wear resistance, but they are inferior in impact resistance, have poor weldability, and must be fixed by brazing without melting the base metal. Therefore, the impact resistance is poor, and the possibility of the carbide chip falling off or being damaged is increased. In this regard, the impact blade main body is inclined so that only the sharp tip of the carbide tip is exposed radially at the boundary between the front surface and the top surface of the tip and outwardly in the rotational direction of the rotary drum. Since it is necessary to embed the cemented carbide chip in the solder, it becomes more difficult to provide the carbide chip by brazing.
JP-A-2004-277709 JP 2007-283243 A Utility model registration No. 3028695

In view of the above technical problems, an object of the present invention is to provide a hammer head capable of adjusting the wear characteristics against impacts during crushing or crushing.
In view of the above technical problems, an object of the present invention is to provide a crusher capable of controlling the particle size of an object to be crushed or crushed regardless of wear of the hammerhead.

In order to achieve the above object, the hammer head of the present invention comprises:
In a hammer head fixed to the outer periphery of a rotatable rotor and crushing or crushing between repulsive fixed blades arranged around the rotor,
The hammer head has a main body extending from the rotor toward the repulsive fixed blade over a predetermined length,
The main body portion is composed of a casting main body portion having an upper surface on the repellent fixed blade side,
A hardfacing portion constituting an impact load receiving surface, and a mild steel portion softer than the hardfacing portion, which is integral with the hardfacing portion, are provided on the rotation direction leading side of the end of the repellent fixed blade side, It is fixed by welding to the casting body through a mild steel part,
The cured built-up portion forms a first edge by the impact load receiving surface and an end surface intersecting the impact load receiving surface on the end side,
The mild steel part has a mild steel part end face flush with the end face adjacent to the end face so as to follow the wear of the first edge of the hardfacing part accompanying crushing or grinding. It is said.

In addition, the main body includes a hardfacing portion constituting an impact load receiving surface on the rotation direction delay side of the end opposite to the rotor, and the hardfacing provided inside the hardfacing portion. A soft steel part that is softer than the part, and the main body part such that the impact load receiving surface on the delay side in the rotation direction becomes the advance side in the rotation direction according to the degree of wear of the hardfacing part due to crushing or crushing It is better to change the orientation of the.

Furthermore, the hammer head is fixed to the other end of the hammer arm, one end of which is fixed to the outer periphery of the rotor,
The main body may extend along the longitudinal direction of the hammer arm.

Furthermore, the cured build-up portion further forms a second edge and a third edge, respectively, by the impact load receiving surface and an opposite side surface intersecting the impact load receiving surface,
The mild steel portion is flush with the opposing side surface adjacent to each of the opposing side surfaces so as to follow the wear of the second and third edges of the hardfacing portion due to crushing or crushing. It is good to have a mild steel part opposing side surface.

In addition, the hardfacing portion and the mild steel portion constitute a two-layer plate comprising a hardfacing layer and a mild steel layer, and the boundary surface between the hardfacing layer and the mild steel layer is the plate surface of the two-layer plate. The two-layer plate is preferably provided in a direction in which the plate surface on the hardfacing layer side becomes the impact load receiving surface.

In order to achieve the above object, the crusher of the present invention is:
A casing having an inlet for charging the object to be crushed or crushed, and forming a crushed or crushed space therein;
6. The rotor according to claim 1, wherein the rotor is provided in the casing and is rotatable, a hammer arm having one end fixed to the outer periphery of the rotor, and the other end of the hammer arm. A hammer having a hammer head according to claim 1,
A repulsive fixed blade provided to be movable relative to the hammer so as to ensure a predetermined interval with respect to the rotation trajectory of the hammer head;
Rotation drive means for rotating the hammer,
The repellent fixed blade is disposed on each side of the rotor across the rotor,
Each of the repellent fixed blades has a circular arc shape with a predetermined length concentrically along the outer periphery of the rotor,
The hammer head and the repellent fixed blade cooperate to perform crushing or crushing.

According to the crusher having the above configuration, the hammer head is rotated by rotating the rotor, and the object to be crushed or crushed is crushed or crushed in cooperation with the tip of the hammer head and the repulsive fixed blade. In this case, the first edge constituted by the impact load receiving surface on the rotation direction leading side, particularly the end surface intersecting with the impact load receiving surface is worn over time, and the hardening provided inside the hardened portion. By providing a mild steel part softer than the cladding part so as to form a mild steel part end face that is flush with the end face adjacent to the end face, the mild steel part is formed on the first edge of the hardened part due to crushing or grinding. It is possible to wear following the wear, and thus it is possible to wear the first edge while standing sharply. Fixed blade By relatively moving in a direction closer against Nma, by adjusting the spacing relative to the rotational locus of the hammer head, regardless of the wear of the hammer head are possible granularity management crushing or grinding object.
Furthermore, the repelling fixed blades are arranged on each side of the rotor across the rotor, and each repelling fixed blade is concentric along the outer periphery of the rotor and forms a circular arc with a predetermined length. When crushing or crushing an object to be crushed or crushed in cooperation with the tip of the head and the repulsive fixed blade, not only crushing or crushing the object to be crushed by the impact load receiving surface, Since the tip of the head, that is, between the upper surface of the main body portion on the side of the repellent fixed blade and the repellent fixed blade, has a high ratio of being crushed or crushed, A groove is provided on the rotation direction delay side from the end face of the part, and the groove is provided with an additional hardened part so that it is substantially flush with the upper surface. To be crushed or crushed By crushing or crushing, it is possible to improve the wear resistance of the upper surface of the body portion on the side of the repellent fixed blade, and thus it is possible to further improve the particle size control of the crushing or crushing object. .

Embodiments of a hammer head, a crusher having a hammer head, and a hammer head manufacturing method according to the present invention will be described below in detail with reference to the drawings, taking coke coal as an example for crushing.
FIG. 1 is a conceptual cross-sectional view of a crusher 10. The crusher 10 includes a casing 12 that forms a crushing or crushing space therein, a rotor 18 that is provided in the casing and is rotatable, and a rotor 18. A predetermined interval can be secured with respect to a hammer having a hammer arm 20 having one end fixed to the outer peripheral portion and a hammer head 24 fixed to the other end of the hammer arm 20 and the rotation trajectory of the hammer head 24. The repulsive fixed blade 27 is provided so as to be movable relative to the hammer, and a rotational drive means for rotating the hammer. The hammer head 24 and the repellent fixed blade 27 cooperate to perform crushing or crushing. I have to.
The box-shaped casing 12 is provided with an inlet 14 for introducing coal into the upper portion thereof and an outlet 16 for discharging crushed coal at the lower portion thereof. A rotor 18 that rotates about a horizontal axis is provided in the center of the casing 12 and is rotated by a motor (not shown). The rotational speed and direction of the rotor 18 are variable according to the type of coal.

A large number of hammer arms 20 are pivotally attached to the outer periphery of the rotor 18 by arm pins 22, and a hammer head 24 is attached to the tip of each hammer arm 20. More specifically, a large number of hammer arms 20 are provided at equiangular intervals on the outer peripheral surface of the rotor 18, and the number of hammer arms 20, that is, the number of hammers to be installed depends on the processing required for the crusher 10. What is necessary is just to determine according to capability, the rotation speed of a motor, etc.
As shown in FIG. 1, when the rotor 18 rotates, the hammer arm 20 rotates due to centrifugal force. However, a concave arc-shaped cross section is formed on both sides of the rotor 18 close to the rotation trajectory of the hammer head 24. A grinding plate 26 is provided so that it can be advanced and retracted by the upper and lower cylinders 28 (in the horizontal direction in the drawing).
A plurality of such sets of hammer arms 20 are provided in the longitudinal direction of the rotor 18 at an appropriate interval from each other.

More specifically, the grinding plate 26 is positioned so as to surround both sides of the hammer 4 provided on the rotor 18, is provided so as to be movable in the direction of the arrow, and the inside (surface facing the rotor 18) is recessed. A plurality of repulsive fixed blades 27 are formed and a base portion is fixed to the casing 12, and a cylinder 28 having a cylinder rod head is connected to the grinding plate 26. The gap between the head 24 and the grinding plate 26 is adjusted.
More specifically, the repelling fixed blade 27 is disposed on each side of the rotor 18 with the rotor 18 in between, and each repelling fixed blade 27 is concentrically formed along the outer peripheral portion of the rotor 18 and has a predetermined length. It has an arc shape.
The length of the arc of the grinding plate 26, that is, the repulsion fixed blade 27, may be appropriately determined according to the type of object to be crushed or crushed, the target particle size, the number of rotations of the rotor 18, the number of hammers 4 installed, and the like.
As described above, the coal introduced into the casing 12 from the coal inlet 14 is pulverized by impact by the rotating hammer head 24 and grinding on the surface of the grinding plate 26 to become coke raw coal and the outlet 16. To be discharged from.

Next, the hammer head 24 will be described. As shown in FIGS. 2 and 3, the hammer head 24 is fixed to the other end of the hammer arm 20 whose one end is fixed to the outer peripheral portion of the rotor 18. It has a main body 32 extending over a predetermined length toward the repellent fixed blade 27.
The main body 32 is a soft steel that is softer than the hardfacing portion 36 that forms the impact load receiving surface 34 and the hardfacing portion 36 that is provided inside the hardfacing portion 36 on the advancing direction side of the end portion 13. Part 38.
Here, the hardened part means an arc welded part, and the hardened part means that a hard metal layer is welded to the base material surface for the purpose of improving wear resistance by arc welding. As the material of the hardened portion, pearlite, martensite, 13% chromium stainless steel, semi-austenite, and high manganese / austenite are preferred from the viewpoint of excellent wear resistance and impact resistance.
Similarly, the main body 32 is softer than the hardfacing portion 36 constituting the impact load receiving surface 34 and the hardfacing portion 36 provided on the inner side of the hardfacing portion 36 on the side of the end portion 13 in the rotation direction delay side. Of the main body 32 so that the impact load receiving surface 34 on the rotation direction lagging side becomes the advance side in the rotation direction in accordance with the degree of wear of the hardfacing portion 36 due to crushing or crushing. The orientation is changed.

The hardfacing portion 36 forms a first edge 42 by the impact load receiving surface 34 and the end surface 40 intersecting the impact load receiving surface 34, and intersects the impact load receiving surface 34 and the impact load receiving surface 34. The opposing side surface 44 further forms a second edge 46 and a third edge 48, respectively. The impact load receiving surface 34 and the end surface 40, and the impact load receiving surface 34 and the opposite side surface 44 are orthogonal to each other, whereby the first edge 42, the second edge 46, and the third edge 48 are sharp. It is formed in a standing state.
The mild steel portion 38 has a mild steel portion end surface 41 that is adjacent to the end surface 40 and is flush with the end surface 40 so as to follow the wear of the first edge 42 of the hardfacing portion 36 accompanying crushing or crushing. The opposite side surfaces 44 are adjacent to the opposite side surfaces 44 so as to follow the wear of the second edge 46 and the third edge 48 of the hardfacing portion 36 due to crushing or crushing. It has a side surface 47.
The material of the mild steel portion 38 may be any material as long as it is easy to weld and softer than the hardfacing portion 36, and is preferably a mild steel having a carbon content of 0.13% to 0.20%. Any of special soft mild steel, ultra mild steel having a low content, or semi-soft steel having a higher carbon content may be used, and may be appropriately selected in consideration of the wear resistance of the mild steel portion determined in relation to the object to be crushed.

As shown in FIGS. 4 and 5, the main body portion 32 includes a casting main body portion 32, and the hardfacing portion 36 and the mild steel portion 38 constitute a two-layer plate 50 including a hardfacing layer and a mild steel layer. As will be described later, the two-layer plate 50 is welded and fixed to the casting main body portion 32 via the mild steel portion 38.
The casting main body 32 is made of, for example, Cr—Mn low alloy cast steel, and has a pair of opposed side surfaces 66 opposed to each other, a pair of opposed front surfaces 62 and an upper surface 64 respectively provided with impact load receiving surfaces 34. On the rotor side, there is a hollow portion in which the tip of the hammer arm 20 is fitted and a pin hole 53 is provided. The grinding plate side, that is, the tip portion is a solid portion 67 having a turtle-like cross section. And is integral with the hollow portion. Reference numeral 89 denotes a weight adjusting projection.
The solid portion 67 has a band-shaped butting surface 52 with respect to the two-layer plate 50, and the two-layer plate 50 is fixed to the casting main body 32 by welding in such a manner that the butting surface 52 is sandwiched on each side of the butting surface 52. A concave weld 54 is provided.

As shown in FIGS. 4 and 5, the upper surface 64 of the casting main body 32 on the side of the repulsive fixed blade 27 has a mild steel portion end surface 41 </ b> A provided on the delay side of the end portion 13 in the rotational direction and a rotational direction advance side of the end portion 13. The groove 200 is provided between the end surface 41B of the mild steel portion provided in the upper surface 64, and the additional hardened portion 201 is provided in the groove 200 so as to be substantially flush with the upper surface 64.
More specifically, the upper surface 64 on the side of the repulsive fixed blade 27 of the casting main body 32 is rectangular, and a rectangular groove 200 defined by the outer peripheral edge of the upper surface 64 is provided, as shown in FIG. In the rectangular groove 200, the additional hardened portion 201 is provided so as to be substantially flush with the upper surface 64.
From the viewpoint of improving wear, the rectangular groove 200 is preferably provided over the entire upper surface 64 so that the upper surface 64 does not expose the portion of the casting main body 32.
As shown in FIG. 9, as a modification, the rectangular groove 200 may be divided into a plurality of sections by the wall of the casting main body 32. As shown in FIG. 9 (A), it may be divided into two sections by a wall 203 of the casting main body portion 32 that intersects each other at right angles, and as shown in FIG. 204 may be divided into four sections.
In any case, the depth of the rectangular groove 200 may be determined according to the amount of the additional hardened portion 201 from the viewpoint of wear resistance, and the depth of the groove between the rectangular grooves 200A to 200D. May be different.

According to the above configuration, it is possible to ensure wear of the hardened built-up portion 36 in a state where the first edge 42 is standing, and the upper surface 64 is protected by the additional hardened built-up portion 201, thereby crushing or Wear resistance of the upper surface 64 when the object to be crushed is crushed or crushed by being positioned between the top surface 64 of the hammer head 24, that is, the upper surface 64 on the repellent fixed blade 27 side of the casting main body 32 and the repellent fixed blade 27. It is possible to improve the property.
In particular, when the particle size control is performed by fine adjustment by adjusting the distance between the upper surface 64 on the side of the repellent fixed blade 27 and the repellent fixed blade 27 of the casting main body 32 by the movement of the grinding plate 26, the upper surface 64 and The first edge 42 on the rotational advance side is exposed to severe wear conditions, which is technically advantageous.

The butting surface 52 is provided on the central axis XX of the casting main body 32, and the concave welded portion 54 is provided symmetrically with respect to the central axis. Each of the concave welded portions 54 is constituted by a plate surface on the mild steel layer side and an inclined surface 68 of the casting main body 32 by abutting the two-layer plate 50 against the abutting surface 52. It is provided so as to extend toward the opposing side surface 66 of the portion 32 and to come out to the opposing side surface 66.
The width D2 of each concave weld 54 is preferably one-tenth to one-fifth of the width D1 of the casting body 32, and the depth W2 of each concave weld 54 is the height h of the two-layer plate 50. It is preferable that it is 1/2 or more. If it is 1/10 or less, the width of the abutting surface 52 is widened, and accordingly, during welding, positioning of the two-layer plate 50 with respect to the casting main body 32 is facilitated, but the welding area is narrowed and the two-layer plate is reduced. 50, the fixing property to the casting main body portion 32 deteriorates. Conversely, if it is 1/5 or more, the welding region is widened, and the fixing property of the two-layer plate 50 to the casting main body portion 32 is good. Further, the width of the abutting surface 52 is narrowed, and accordingly, it is difficult to position the two-layer plate 50 with respect to the casting main body 32 during welding. Fixability to 32 deteriorates. In this regard, as will be described later, by welding the lower end portion of the two-layer plate 50 to the front surface 62 of the casting main body portion 32 from the outside, the depth W2 of each concave welded portion 54 is set to the height of the two-layer plate 50. It may be about one half of the length h.

Next, the two-layer plate 50 will be described. As shown in FIGS. 6 and 7, the boundary surface between the hardfacing layer 36 and the mild steel layer 38 is parallel to the plate surface of the two-layer plate 50. The two-layer plate 50 is provided in such a direction that the plate surface on the hardfacing layer 36 side becomes the impact load receiving surface 34 when being fixed to the casting body 32 by welding. The size of the two-layer plate 50, particularly the height h, may be determined according to the magnitude of impact load affected by the amount of coal crushed, the rotational speed of the rotor, etc. The two-layer plate 50 needs to be welded and fixed to the casting main body 32 so that the impact resistance against the impact load generated at the time can be secured. From this viewpoint, the size of the concave welded portion 54 needs to be determined. There is.
When the thickness of the two-layer plate 50 is constant, the thicker the hardfacing layer 36 is, the thinner the mild steel layer 38 is. Accordingly, the wear resistance is improved, but once the wear proceeds, the mild steel The degree to which the wear of the layer 38 follows the wear of the hardfacing layer 36 is reduced, and it is difficult for the wear in an edged state to occur, and the hardfacing 36 is welded to the mild steel layer 38 as a base material. When it is provided, thermal strain or the like is likely to occur on the base material due to the thermal effect on the base material.
On the other hand, as the thickness of the mild steel layer 38 increases, the thickness of the hardfacing layer 36 decreases accordingly, so that the wear resistance decreases, but once the wear progresses, the wear of the mild steel layer 38 becomes hardened. The degree of follow-up of the build-up layer 36 increases, and wear in an edged state is likely to occur, and when the hardened build-up 36 is provided by welding to the mild steel layer 38 that is the base material, Due to the thermal effect, thermal distortion or the like is less likely to occur on the base material.
From the above viewpoint, the thickness of each of the hardfacing layer 36 and the mild steel layer 38 may be determined. In particular, the thickness of the hardfacing layer 36 is preferably equal to or less than the thickness of the mild steel layer 38.

The two-layer plate is available as, for example, the product name ALCOPLATE of Hardface Weld Company, Ltd., and is a flat plate whose surface is hardened by a non-gas welding method with a predetermined welding material on a carbon steel plate (equivalent to SS400). The plate is cut into a rectangular shape by a plasma cutting machine, for example, and has a high cooling rate at the time of welding, and therefore has excellent wear resistance.
The component of the hardfacing portion is cast iron of 30% Cr + 5 to 6% C, and the wear resistance by the so-called rubber wheel test under the following test conditions is as follows.
Test load: 8.8 kilograms Test time: 25 minutes Rotation speed: 120 RPM
Rubber wheel disk dimensions: Thickness 15 mm, outer shape 250 mm Powder: Silica sand No. 6 powder fall amount: 300 g / min

Regarding wear loss, since mild steel material (SS400) is 1.5911 and ALCOPLATE is 0.1117, ALCOPLATE is used as the wear resistance ratio (the mild steel material is 1). 14.2. Regarding the hardness of ALCOPLATE, the Rockwell hardness is 60 to 65, the Shore hardness is 80 to 91, and the Vickers hardness is 690 to 830.

The widths of the opposed front surfaces 62 of the casting main body 32 are tapered so as to become thicker toward the repulsive fixed blade 27, and the impact load receiving surface 34 of the hardfacing layer 36 corresponds to the casting main body 32. It is good to protrude outside in the range of 10 mm or less with respect to the front surface 62. Further, the lower end portion of the impact load receiving surface 34 of the hardfacing layer 36 may be welded and fixed to the casting main body portion 32 from the outside.

Next, a method for manufacturing the hammerhead 24 having the above configuration will be described below.
First, a two-layer plate 50 composed of a hardfacing layer 36 and a mild steel layer 38 is prepared, a butt surface 52 for the two-layer plate 50 and a concave welded portion 54 with the two-layer plate 50 are provided, and a rectangular shape is formed on the upper surface 64. The casting main body 32 provided with the groove 200 is prepared.
In this case, the preparation steps of the two-layer plate 50 include a step of preparing a mild steel plate having a predetermined thickness, a step of performing a build-up of a predetermined thickness over one flat portion of the mild steel plate, Cutting the piled mild steel plate into a predetermined rectangular shape, and finishing the edge of the hardfacing layer with an edge standing.
For example, when cutting is performed by plasma cutting so that the peripheral side surface of the hardfacing layer 36 and the peripheral side surface of the mild steel layer 38 are adjacent and flush with each other on the peripheral side surface of the two-layer plate 50, It is possible to finish with the edge standing sharper than the finish with the edge of the impact load receiving surface being dull.
Next, the two-layer plate 50 is butted against the butting surface 52 of the casting main body portion 32 with the mild steel layer side and welded and fixed via the mild steel layer 38, whereby the hardfacing layer 36 of the two-layer plate 50 is fixed. It is formed as an impact load receiving surface 34.
More specifically, by using the inclined surface 68 and the inclined surface 63 which are oblique groove surfaces, a torch using a wire is provided inside the concave welded portion 54 and between the lower surface of the two-layer plate 50 and the inclined surface 63. Insert and weld by arc welding.
As described above, when the two-layer plate 50 is welded to the casting main body portion 32, it can be easily welded by abutting the mild steel layer side and welding via the mild steel layer 38. The mild steel portion 38 that wears following the wear of the hardened built-up portion 36 due to the accompanying impact load is also effectively used for ease of welding.
Thus, each of the two-layer plate 50 is welded and fixed to the cast main body portion 32 at the inner surface and the lower surface of the plate on the mild steel layer side, so that the two-layer plate 50 is cast into the cast main body portion 32 by an impact load at the time of crushing. It is possible to fix firmly without falling off.
Subsequently, additional hardening build-up is performed on the rectangular groove 200 provided on the upper surface 64 so that the build-up portion is flush with the upper surface 64, and the hammer head 24 is completed.

According to the manufacturing method of the hammer head 24 described above, the plate surface on the side of the soft steel layer of the two-layer plate 50 made of the hardened layer 36 and the softened steel layer 38 softer than the hardened layer 36 is used as the butt surface of the casting main body 32. The two-layer plate 50 is welded and fixed to the casting main body 32 via the mild steel layer 38 using the concave welded portion 54 in a state where the two-layer plate 50 is abutted and positioned. The hammerhead 24 can be easily and efficiently manufactured by using the mild steel layer 38 that can be easily welded while quickly positioning with respect to the armature, and the hardfacing layer 36 of the two-layer plate 50 can be subjected to an impact load. While forming as the receiving surface 34, the peripheral side surface of the hardfacing layer 36 and the peripheral side surface of the mild steel layer 38 are adjacent to and flush with each other on the peripheral side surface of the two-layer plate 50. From the fact that the first edge 42, the second edge 46 and the third edge 48 constituted by the end face 40 and the opposite side face 44 intersecting with the impact load receiving surface 34 are worn over time, the mild steel layer 38 is It is possible to follow the wear of the first edge 42, the second edge 46, and the third edge 48 of the hardfacing layer 36 due to crushing or crushing, thereby improving the wear resistance. It is possible to manufacture a simple hammer head 24.

In the hammer head 24 having the above configuration, as shown in FIG. 8 (the progress of wear is indicated by a line), a soft steel portion 38 that is softer than the hardfacing portion 36 is provided inside the edge portion of the hardfacing portion 36. In this case, the wear characteristics of the hammer head 24 can be adjusted by utilizing the property that the mild steel portion 38 wears following the wear of the hardfacing portion 36 due to the impact load accompanying crushing or crushing. It is.

That is, according to the hammer head 24 having the above-described configuration, the hammer head 24 is rotated by rotating the rotor 18, and the tip of the hammer head 24 and the repulsive fixed blade 27 cooperate to be crushed or crushed. When crushing or crushing an object, a first edge 42, a second edge 46, and a side face 44 that intersect with the impact load receiving surface 34, particularly the end face 40 that intersects the impact load receiving surface 34, are provided. As the third edge 48 wears over time, a soft steel portion 38 that is softer than the hardfacing portion 36 provided inside the hardfacing portion 36 is adjacent to the end surface 40 and is flush with the end surface 40. By providing each of the end faces of the mild steel portion and the opposite side surfaces 44 so as to form the opposite side surfaces 44 and the opposite side surfaces 44, respectively, the mild steel portion 38 is broken. Alternatively, it is possible to follow the wear of the first edge 42, the second edge 46, and the third edge 48 of the hardened built-up portion 36 accompanying the grinding, so that the first The first edge 42, the second edge 46, and the third edge 48 are each worn in a sharp state without being worn in such a manner that the first edge 42, the second edge 46, and the third edge 48 are rounded. It is possible.
Further, the repelling fixed blades 27 are arranged on each side of the rotor 18 with the rotor 18 interposed therebetween, and each repulsive fixing blade 27 has a circular arc shape of a predetermined length concentrically along the outer peripheral portion of the rotor 18. Therefore, when the object to be crushed or crushed is crushed or pulverized in cooperation with the tip of the hammer head 24 and the repulsive fixed blade 27, not only crushing or pulverizing the object to be crushed by the impact load receiving surface 34 is performed. Since the object to be crushed or crushed is located between the top end portion 64 of the hammer head 24, that is, the upper surface 64 of the repellent fixed blade 27 side of the main body and the repellent fixed blade 27, the ratio of the crushed or crushed object is high. A groove 200 is provided on the upper surface 64 on the side of the repulsive fixed blade 27 of the portion on the side delayed in the rotational direction from the end surface 41 of the mild steel portion, and the additional hardfacing portion 201 is substantially flush with the upper surface 64 in the groove 200. Set in By collaborating with the tip of the hammer head 24 and the repellent fixed blade 27, the object to be crushed or crushed is crushed or pulverized, thereby improving the wear resistance of the upper surface 64 on the side of the repellent fixed blade 27 of the main body. It is possible to improve.

According to the crusher having the above-described configuration, the hammer head 24 is rotated by rotating the rotor, and the object to be crushed or crushed is crushed or collaborated with the tip of the hammer head 24 and the repulsive fixed blade 27. When pulverizing, the first load 42, the second edge 46, and the third edge 48 constituted by the impact load receiving surface 34 on the rotation direction leading side, in particular, the end surface 40 and the opposite side surface 44 intersecting the impact load receiving surface 34. Is gradually worn over time, the soft steel part 38 softer than the hardened part 36 provided inside the hardened part 36 is adjacent to the end face 40 and the end face 40 of the soft steel part is flush with the end face 40, Further, the hard steel portion 38 is hardened by crushing or crushing by being provided so as to form each of the opposite side surfaces 44 and the opposite side surface 44 so as to form the same mild steel portion opposite side surface. 36 to follow the wear of each of the first edge 42, the second edge 46, and the third edge 48, whereby the first edge 42, the second edge 46, and the third edge. Since each 48 can be worn while standing sharply, the hammer head 24 is moved by moving the repulsive fixed blade 27 relative to the hammer in accordance with the wear situation. By adjusting the interval with respect to the rotation trajectory, the particle size of the object to be crushed or crushed can be controlled regardless of the wear of the hammer head 24.
More specifically, by moving the repulsive fixed blade 27 in accordance with the wear state of the first edge 42, it is possible to keep the crushing particle size constant over a long period of time, or the rotational speed of the rotor 18 is increased. It is possible to cope with this by moving the repulsive fixed blade 27 against the wear situation of the first edge 42 while securing the crushing efficiency by raising it from the conventional level.
Further, the repelling fixed blades 27 are arranged on each side of the rotor 18 with the rotor 18 interposed therebetween, and each repulsive fixing blade 27 has a circular arc shape of a predetermined length concentrically along the outer peripheral portion of the rotor 18. Therefore, when the object to be crushed or crushed is crushed or pulverized in cooperation with the tip of the hammer head 24 and the repulsive fixed blade 27, not only crushing or pulverizing the object to be crushed by the impact load receiving surface 34 is performed. Since the object to be crushed or crushed is located between the top end portion 64 of the hammer head 24, that is, the upper surface 64 of the repellent fixed blade 27 side of the main body and the repellent fixed blade 27, the ratio of the crushed or crushed object is high. A groove 200 is provided on the upper surface 64 on the side of the repulsive fixed blade 27 of the portion on the side delayed in the rotational direction from the end surface 41 of the mild steel portion, and the additional hardfacing portion 201 is substantially flush with the upper surface 64 in the groove 200. Set in By collaborating with the tip of the hammer head 24 and the repellent fixed blade 27, the object to be crushed or crushed is crushed or pulverized, thereby improving the wear resistance of the upper surface 64 on the side of the repellent fixed blade 27 of the main body. Therefore, the particle size control of the object to be crushed or crushed can be further improved.

The embodiments of the present invention have been described in detail above, but various modifications or changes can be made by those skilled in the art without departing from the scope of the present invention.
For example, in the present embodiment, the object to be crushed has been described as coal for iron making. However, the present invention is not limited to this. For example, as long as wear on the impact load receiving surface of the hammer head is a problem with pulverization or crushing, for example, disposal Plastics, waste materials and wastes, and concrete blocks may be used.
For example, in the present embodiment, the case where the two-layer plate 50 is welded to the casting main body portion 32 has been described. However, the present invention is not limited to this, and mild steel is provided inside the hardfacing portion 36 constituting the impact load receiving surface. As long as the portion 38 is provided, the hardfacing portion 36 and the mild steel portion 38 may be separately provided for the casting main body portion.

For example, in the present embodiment, the mild steel portion has been described as a plate-like one as the mild steel layer 38, but the first edge 42, the second edge 46, and the third edge of the hardfacing portion 36 are not limited thereto. 48, as long as it is possible to wear with the edges standing, only the first edge 42, the second edge 46 and the third edge of the hardfacing portion 36 are U-shaped or annular mild steel portions. 38 may be provided.
For example, in the present embodiment, the cast main body has been described as being made of Cr-Mn low alloy cast steel as in the conventional case, but since it is possible to employ a lower impact wear resistance than in the past, A cheaper cast product may be adopted as long as the frictional wear resistance of the pin connecting portion can be ensured.

It is the schematic of the crusher 10 which concerns on 1st Embodiment of this invention. It is a perspective view of hammer head 24 concerning a 1st embodiment of the present invention. It is a side view of hammerhead 24 concerning a 1st embodiment of the present invention. It is a perspective view of the casting main-body part 32 which concerns on 1st Embodiment of this invention. FIG. 4 is a sectional view taken along line AA in FIG. 3. It is sectional drawing of the 2 layer plate 50 which concerns on 1st Embodiment of this invention. It is a perspective view which shows the state which faced the 2 layer plate 50 with respect to the casting main-body part 32 which concerns on 1st Embodiment of this invention. It is a schematic diagram which shows the wear condition of the casting main-body part 32 which concerns on 1st Embodiment of this invention. It is a fragmentary figure which shows the modification of the groove | channel provided in the upper surface of the casting main-body part 32 in 1st Embodiment of this invention. It is a perspective view of the conventional hammerhead. It is a schematic diagram which shows the wear condition of the conventional hammer head.

T1 Thickness of hardfacing part T2 Thickness H of mild steel part Overhang amount D1 Width of butt face D2 Width of concave welded part W Depth of welded part H Height of concave welded part XX Center line S Fixed Interval between blade 27 and hammer head 10 Crusher 12 Casing 14 Input port 16 Discharge port 18 Rotor 20 Hammer arm 22 Arm pin 24 Hammer head 25 Crushing space 26 Grinding plate 28 Cylinder 32 Casting body 34 Impact load receiving surface 36 Hardened meat Embossed portion 38 Mild steel portion 40 End surface 40 Mild steel end surface 42 First edge 43 Inner surface 44 Mild steel opposing side surface 44 Opposing side surface 44 Opposing side surface 46 Second edge 48 Third edge 50 Two-layer plate 52 Abutting surface 53 Pin hole 54 Concave welded portion 57 Edge 59 Edge 62 Opposing side surface 63 Inclined surface 64 Upper surface 66 Opposing front surface 67 Solid portion 68 Inclined surface 70 Mild steel welded portion 72 Additional hardfacing portion 7 End face part 79 of hardfacing part End face part 80 of soft steel part Hammer head part 81 Side face part 82 of hardfacing part Pin hole 83 Side face part 85 of soft steel part Side face part 87 of hard steel part Side face part 89 of hardfacing part Part 100 Hammer head 101 Hardened part 102 Short side plane 103 First edge 104 Long side side 105 Second edge 106 Main body 107 Third edge 108 Pin hole 200 Rectangular groove 201 Additional hardened part 203 Wall 204 Wall

Claims (6)

In a hammer head fixed to the outer periphery of a rotatable rotor and crushing or crushing between repulsive fixed blades arranged around the rotor,
The hammer head has a main body extending from the rotor toward the repulsive fixed blade over a predetermined length,
The main body portion is composed of a casting main body portion having an upper surface on the repellent fixed blade side,
A hardfacing portion constituting an impact load receiving surface, and a mild steel portion softer than the hardfacing portion, which is integral with the hardfacing portion, are provided on the rotation direction leading side of the end of the repellent fixed blade side, It is fixed by welding to the casting body through a mild steel part,
The cured built-up portion forms a first edge by the impact load receiving surface and an end surface intersecting the impact load receiving surface on the end side,
The mild steel part has a mild steel part end face flush with the end face adjacent to the end face so as to follow the wear of the first edge of the hardfacing part accompanying crushing or crushing. Hammer head characterized by The main body portion includes a hardfacing portion constituting an impact load receiving surface on the rotation direction delay side of the end opposite to the rotor, and the hardfacing portion provided inside the hardfacing portion. A soft mild steel part, and depending on the degree of wear of the hardfacing part due to crushing or crushing, the main body part is arranged so that the impact load receiving surface on the delay side in the rotation direction becomes the advance side in the rotation direction The hammerhead of claim 1, wherein the hammerhead changes direction. The hammer head is fixed to the other end of the hammer arm, one end of which is fixed to the outer periphery of the rotor,
The hammer head according to claim 1, wherein the main body portion extends along a longitudinal direction of the hammer arm. The cured build-up part further forms a second edge and a third edge, respectively, by the impact load receiving surface and an opposite side surface intersecting the impact load receiving surface,
The mild steel portion is flush with the opposing side surface adjacent to each of the opposing side surfaces so as to follow the wear of the second and third edges of the hardfacing portion due to crushing or crushing. The hammerhead according to any one of claims 1 to 3, wherein the hammerhead has a side facing the mild steel portion.         The hardfacing portion and the mild steel portion constitute a two-layer plate composed of a hardfacing layer and a mild steel layer, and the boundary surface between the hardfacing layer and the mild steel layer is parallel to the plate surface of the two-layer plate. The hammerhead according to claim 1, wherein the two-layer plate is provided in a direction in which a plate surface on the hardfacing layer side becomes the impact load receiving surface. A casing having an inlet for charging the object to be crushed or crushed, and forming a crushed or crushed space therein;
6. The rotor according to claim 1, wherein the rotor is provided in the casing and is rotatable, a hammer arm having one end fixed to the outer periphery of the rotor, and the other end of the hammer arm. A hammer having a hammer head according to claim 1,
A repulsive fixed blade provided to be movable relative to the hammer so as to ensure a predetermined interval with respect to the rotation trajectory of the hammer head;
Rotation drive means for rotating the hammer,
The repellent fixed blade is disposed on each side of the rotor across the rotor,
Each of the repellent fixed blades has a circular arc shape with a predetermined length concentrically along the outer periphery of the rotor,
The crusher characterized in that the hammer head and the repulsive fixed blade cooperate to crush or crush.

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