JP3624150B2 - Impact member fixing structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a structure for fixing an impact crushing tool in a centrifugal collision crusher.
[0002]
[Prior art]
A centrifugal collision type crusher is well known as a crusher for crushing a lump of rock or the like for aggregates for concrete, etc., and the applicant of the present invention has also proposed in JP-A-10-309484, And it is a well-known structure. Since the structure of this centrifugal collision type crusher is described in the above-mentioned publication, detailed explanation is omitted. Briefly described, this centrifugal collision type crusher is based on the principle that a crushing object such as rock to be crushed is supplied to the central portion of the rotor, accelerated by centrifugal force and discharged from the periphery of the rotor.
[0003]
A rotor for effectively applying centrifugal force to an object to be crushed has a rotary blade structure. In principle, the rotating blade structure is provided with a guide body (also called a liner) extending radially in a disc, and the object to be crushed to which the circumferential speed (rotation direction) is given by this guide body gives a centrifugal force. It is done. The object to be crushed is discharged from the rotor at a speed obtained by synthesizing the circumferential speed component (tangential direction) and the centrifugal direction component.
[0004]
In order to increase the impact force when the object to be crushed collides with a dead stock or an anvil colliding body, the radius of the rotor and the rotational angular velocity of the rotor are designed to be large. Increasing the rotor radius is designed to increase the rotational angular velocity due to design limitations. For this reason, a high speed is required, and a structure having high rigidity that can withstand this demand is demanded.
[0005]
In recent centrifugal collision type crushers, which are becoming more efficient, a rotational angular velocity is given so that the Coriolis force cannot be ignored. A large frictional force is generated during A Coriolis force having a magnitude proportional to the speed generates a larger frictional force on the outer side of the guide body. The presence of such frictional forces that cause wear of the rotor member erodes certain portions of the rotor. The erosion part expands geometrically and destroys a part of the rotor.
[0006]
Centrifugal collision type crushers are roughly divided into anvil type and dead stock type from crushing forms of rocks and the like. In the dead stock type, the object to be crushed such as rock inserted from the insertion hole in the upper center of the crusher is crushed by the rotor blades of the rotating rotor. It is discharged into dead stock and crushed by the high angular velocity of the rotor blades.
[0007]
The rotor can be rotated in forward and reverse directions, and can be crushed in any direction. An impact crushing tool for colliding with and crushing an object to be crushed is attached to the outer peripheral edge of the rotor. Since this impact crushing tool is composed of a chip plate and an impact member, and the impact member is consumed, various measures are taken. A wear resistant material such as cemented carbide or ceramic is used for the impact member.
[0008]
The impact member is fixed to the outer peripheral edge of the rotor by silver brazing or an adhesive on a chip plate directly attached to the rotor. Since a large impact force is applied at the portion where the object to be crushed collides, it is necessary to be firmly fixed. For example, the tip plate on the rotor body side is formed in a concave shape, and the impact member is fitted in the concave portion.
[0009]
However, this method complicates the mounting configuration of the impact member and requires high accuracy for mounting. Further, when the object to be crushed collides with the chip plate in some cases. In this case, the tip plate is worn earlier because the hardness is lower than that of the impact member. As a result, the impact member may be detached from the tip plate before the impact member is consumed due to wear of the tip plate.
[0010]
When the impact member is fixed to the chip plate by silver brazing, it can be attached without complicating the shape, but the thermal effect during brazing is large, and it is difficult to apply to large parts. For this reason, the impact member to be attached must be subdivided and attached by combining small parts, and attachment with strong strength cannot be achieved.
[0011]
[Problems to be solved by the invention]
The present invention has been made based on the technical background as described above, and achieves the following object.
An object of the present invention is to provide an impact member fixing mechanism that increases the fixing strength of the impact member, enables high-speed rotation of the rotor, and increases the crushing efficiency.
Another object of the present invention is to provide an impact member fixing mechanism in which the residual thermal stress and strain of the chip plate to which the impact member is fixed are removed to improve the crushing efficiency.
Still another object of the present invention is to provide an impact member fixing mechanism capable of attaching an impact member at low cost without requiring special attachment in consideration of thermal influence.
[0012]
[Means for Solving the Problems]
The impact member fixing structure of the present invention is an impact crushing tool fixed to a rotor portion of a centrifugal collision crusher, and includes a tip plate (20) attached to an outer peripheral edge of the rotor portion, and the tip plate (20 ), A substantially L-shaped impact member (19) that is tightly bonded via an adhesive, a plurality of first pin holes (26) provided in the chip plate (20), and the substantially L-shaped The chip plate is inserted into a plurality of second pin holes (25) provided on the surface sides (A, B) having different directions, the first pin holes (26), and the second pin holes (25). (20) and a pin (27) for fixing the impact member (19).
Further, in the impact member fixing structure, the impact member may be a chip selected from cemented carbide, cermet, ceramic, or the like.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings, but a conventional example will be described first for comparison. FIG. 4 shows a conventional example and is a plan view of a rotor 2 to which an impact crushing tool 1 is attached. A tip plate 4 is provided symmetrically on the wing body 3 of the rotor 2 provided at three equal intervals. The structure of this conventional centrifugal collision type crusher is described in Japanese Patent Application Laid-Open No. 10-309484, filed by the same applicant as the present invention, and is well known.
[0014]
The basic configuration is as follows. A crushing object input hole is provided at the upper center of the centrifugal collision type crusher, and a crushing object such as a rock is inserted through the input hole. A rotatable rotor 2 is provided below the charging hole, and the object to be crushed falls onto the center cap 5 at the center of the rotor 2 and is discharged toward the outer dead stock 6 as the rotor 2 rotates. Is done. During the discharge, the object to be crushed collides with the impact crushing tool 1 provided on the wing body 3 and is crushed.
[0015]
Although the impact crushing tool 1 is provided outside the rotor 2 as shown in the figure, a second impact crushing tool 7 is also provided on the center cap 5 side inside the rotor 2. The impact crushing tool 1 is basically configured such that a cemented carbide chip 8 (impact member) is attached to a chip plate 4 as a base material, and the detailed configuration of the impact crushing tool alone is shown in FIGS. 6. The tip of the chip plate 4 is a recess 9, and a cemented carbide chip 8 is silver-brazed to the recess 9.
[0016]
The chip plate 4 is divided into two parts, and each chip plate 4 is attached to the wing body 3 by bonding or bolts 10. When the cemented carbide chip 8 is attached to the chip plate 4 having this configuration, there is a drawback that the thickness of the chip plate is reduced and the rigidity is lowered. Further, the object to be crushed collides with the A surface and the B surface on the chip plate 4, and this surface is worn. In particular, the surface A is the surface of the chip plate 4 itself and has not been subjected to special hardening treatment, and since the thickness is thin, it is reinforced by applying a hardfacing weld 11 to prevent wear. As a result, the attachment of the cemented carbide tip 8 and the hard welding 11 are affected by heat.
[0017]
7 and 8 are also conventional embodiments, and the chip plate 12 is divided into two parts in the same manner as described above, except that the hardfacing welding is omitted, and the cemented carbide chips 13a, 13b, 13c are divided into three chip plates. This is an example in which 12 is attached by silver brazing. Although the A surface and the B surface are covered with the cemented carbide chips 13a, 13b, and 13c, the chip mounting configuration is complicated, the rigidity is low, and a large impact crushing tool configuration is difficult.
[0018]
9 and 10 are also conventional examples. 7 and FIG. 8 are developed, and the chip plate 14 is integrated. However, the cemented carbide chip 15 itself is divided into two parts, and is bonded to the chip plate 14 by bonding or silver brazing. It is attached. Even in this case, the cemented carbide chip 15 is damaged by an impact caused by the collision of the object to be crushed. If the crushing impact is large, it will be damaged by the effect of internal residual stress. If the bonding strength is insufficient or the internal stress remains, a cemented carbide tip will be applied when a large object to be crushed is thrown into the crusher or when a foreign object such as metal is mixed. End up.
[0019]
[Embodiment 1]
Next, examples of the present invention will be described. FIG. 1 is a plan view of a rotor of a centrifugal collision type crusher to which a chip plate of the present invention is attached. As described above, the rotor 2 has three wing bodies 3, and two impact crushing tools 16 are attached to the outer peripheral edge of the wing body 3 symmetrically. A second impact crushing tool 7 is also provided on the center cap 5 side of the center of the rotor 2.
[0020]
In the second impact crushing tool 7, a tip plate 18 is pasted across the dead stock 17 side on the left and right of one wing body 3, and a cemented carbide tip 18 a is brazed with silver on the tip plate 18. It is configured. The second impact crushing tool 7 needs to withstand the impact of rocks and the like falling from above, and also applies impacts to the rocks and the like as the rotor 2 rotates.
[0021]
The left and right tip plates 20 are sandwiched between tip cover plates 22 so as to embrace the end portions 21 of the wing body 3 and attached by bolts 23 to the dead stock 17 side of the outer periphery of the wing body 3 as described above. A cemented carbide chip 19 (impact member) on the chip plate 20 is opposed to an object to be crushed which is introduced from the inlet and dropped and released to the rotor 2. Since the second impact crushing tool 7 is attached to the inner peripheral side of the wing body 3 as described above, the object to be crushed before the second impact crushing tool 16 collides with the second impact crushing tool 16. The impact crushing tool 7 also collides and is crushed.
[0022]
However, the impact force is weaker than the outer impact crushing tool 16. The rotor 2 can rotate forward and backward, but the object to be crushed collides with the impact crushing tool 16 on the C side when rotated in the X direction in the figure, and the object to be crushed is D side when the rotor rotates in the Y direction. It collides with the impact crushing tool 16. It is against the cemented carbide tip 19 that actually collides.
[0023]
The object to be crushed by the collision or released by rubbing is blown outward from the space of the protector 24 between the wing bodies 3. In the case of the dead stock method, the crushed object to be crushed collides with the dead stock in the casing body, and the crushed object is crushed with each other and simultaneously polished with each other to produce crushed sand.
[0024]
After the start of operation, the objects to be crushed accumulate in the dead stock space. When the accumulated amount of dead stock reaches the limit, a circumferential motion is applied directly from the dead stock and the flow path forming member to receive a centrifugal force. In this way, the cemented carbide tip 19 is worn when the object to be crushed is discharged outward. As described above, the cemented carbide tips 19 arranged symmetrically on both sides of the blade body 3 can be evenly worn by forward and reverse rotation of the rotor 2.
[0025]
2 and 3 show the impact member fixing structure of the present invention. The chip plate 20 was integrated without being divided, and the cemented carbide chip 19 was also integrated without being divided. The cemented carbide chip 19 has a substantially L-shape and is bonded to a chip plate 20 whose mounting surface is matched to the mounting shape of the cemented carbide chip 19 via an adhesive.
[0026]
In the present embodiment, the cemented carbide chip 19 is described as being attached to the chip plate 20, but the same applies to ceramics. Any material may be used as long as it is a wear-resistant member. Further, the cemented carbide chip 19 is provided with two pin holes 25 on each of the A surface side and the B surface side, and the chip plate to be attached is also provided with pin holes 26 at the same positions.
[0027]
The cemented carbide chip 19 is fixed to the chip plate 20 together with an adhesive by pins 27 inserted into these pin holes 25 and 26. In the present invention, adhesion by silver brazing is not performed. This is to avoid thermal effects. As for the thermal effect, when the bonding area is large, the degree of distortion increases and stress remains. Disturbances caused by this distortion also occur in the manufacturing process and are a bottleneck in production.
[0028]
The method using an adhesive has the disadvantage that the bonding force is slightly inferior to that of silver brazing, but has the advantage that it is not affected by heat and is easy to manufacture. The material of the pin 27 is a cemented carbide like the cemented carbide tip 19. Since the material of the pin 27 is the same as that of the cemented carbide chip 19, only the pin 27 is not worn first when the object to be crushed collides.
[0029]
Therefore, it is possible to avoid only the pin 27 being altered or falling off due to corrosion or the like. Further, since the insertion direction of the pin 27 is perpendicular to the A and B surfaces, it is effective for impacts from either the A or B surface. This is effective for impacts in a plurality of directions as long as the number of surfaces increases and pins 27 are provided accordingly.
[0030]
In order to increase the efficiency of the centrifugal collision type crusher, it is necessary to increase the speed. However, according to the configuration of the present invention described above, the cemented carbide chip 19 is firmly attached and the fixing strength is increased. Also, the cemented carbide chip 19 can be prevented from being peeled off from the chip plate 20 due to the insertion of the pin 27 and the large bonding surface against an impact or load in a direction parallel to the bonding surface.
[0031]
Moreover, although demonstrated by inserting the pin 27 in the cemented carbide chip 19, a volt | bolt may be sufficient. In this case, a screw hole may be provided on the tip plate 20 and the cemented carbide tip 19 may be fastened and fixed. The hole 28 is a bolt hole for attaching the tip plate 20 to the wing body 3. Further, a counterbore hole may be provided on the surface of the cemented carbide tip so that the head of the bolt does not protrude from the surface of the cemented carbide tip, or a pin-shaped screw rod may be used.
[0032]
[Embodiment 2]
As mentioned above, although embodiment of this invention has been described, the object of this invention is not limited to this. For example, the cemented carbide chip may be attached to the chip plate by providing a screw hole on the cemented carbide chip side and bolting from the chip plate side at the portion where the pin is to be installed. Moreover, you may join a cemented carbide chip | tip directly to a rotor not via a chip | tip plate.
[0033]
Furthermore, it is possible to join the cemented carbide chip only with pins or bolts which are detachable fixing means without using an adhesive, as long as there is no problem in strength. Further, the fixing member may be configured to be detachably attached with one touch so that the cemented carbide chip can be easily removed.
[0034]
【The invention's effect】
As explained above, the heat treatment such as brazing is not required, so there is no risk of internal residual stress and distortion, and there are no restrictions on the shape and size of the crushing tool and the selection of wear-resistant materials. This makes it possible to supply reliable and low-priced parts. In addition, the cemented carbide chip is bonded to the chip plate with an adhesive and reinforced with pins or bolts, resulting in a strong crushing tool and high speed operation of the applied centrifugal collision crusher. It was.
[0035]
In addition, as the crushing tool, the cemented carbide chip and the chip plate are integrated, not divided, the rigidity of the crushing tool itself can be increased, the life can be extended, and it is safe against the biting of foreign matter. It was decided to increase the crushing efficiency.
[Brief description of the drawings]
FIG. 1 is a plan sectional view showing a rotor portion of a centrifugal collision type crusher equipped with a crushing tool of the present invention.
FIG. 2 is a plan view of the crushing tool of the present invention.
FIG. 3 is a side view of the crushing tool of the present invention.
FIG. 4 is a plan sectional view showing a rotor portion of a centrifugal collision type crusher equipped with a conventional crushing tool.
FIG. 5 is a plan view of a conventional crushing tool.
FIG. 6 is a side view of a conventional crushing tool.
FIG. 7 is a plan view of a conventional crushing tool.
FIG. 8 is a side view of a conventional crushing tool.
FIG. 9 is a plan view of a conventional crushing tool.
FIG. 10 is a side view of a conventional crushing tool.
[Explanation of symbols]
2 ... rotor 3 ... wing body 16 ... impact crushing tool 19 ... cemented carbide tip 20 ... tip plate 22 ... tip cover plate 27 ... pin

Claims (2)

A tool for impact crushing fixed to the rotor of a centrifugal collision crusher,
A chip plate (20) attached to the outer periphery of the rotor portion;
A substantially L-shaped impact member (19) which is tightly bonded to the chip plate (20) via an adhesive;
A plurality of first pin holes (26) provided in the chip plate (20);
The generally L-shaped orientation different side and (A, B) a plurality of second pin holes (25) respectively provided,
An impact member fixing structure comprising a pin (27) inserted into the first pin hole (26) and the second pin hole (25 ) and fixing the impact member (19) to the chip plate (20). The impact member fixing structure according to claim 1,
The impact member fixing structure, wherein the impact member is a wear-resistant material and is a chip composed of one or more selected from cemented carbide, cermet, and ceramic.

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