JP6552818B2 - Refueling structure of rotary crusher - Google Patents

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a rotary crusher that supplies and crushes an object to be crushed, such as raw stone, between a rotating mantle and a cone cave, and in particular to a refueling structure of the rotary crusher.

  A rotary crusher such as a cone crusher or a gyratory crusher is formed between a funnel-shaped mantle fixed to the upper part of the main spindle assembly to be rotated and a cone cave provided to cover the mantle. It is a machine equipped with a crushing chamber.

  A lower frame assembly having an outer cylinder bush portion is disposed below the cone cave, and an inner cylinder bush portion of an eccentric sleeve assembly is fitted to the outer cylinder bush portion of the lower frame assembly. At the eccentric position of the inner cylinder bush part, a hole extending in a direction inclined with respect to the rotation axis of the inner cylinder bush part is formed, and the spindle assembly with the mantle fixed is fitted into the hole of the inner cylinder bush part Has been. Further, a flange portion extending outward from the outer cylinder bush portion is fixed to an end portion of the inner cylinder bush portion, and a rotational power transmission system is connected to the tip of the flange portion. The main shaft assembly and the mantle are integrally rotated around the rotation axis of the inner cylinder bush portion by rotating the flange portion and the inner cylinder bush portion integrally around the rotation axis of the inner cylinder bush portion by the rotational power from the rotational power transmission system. It is rotated around.

  When the raw stone is supplied to the crushing chamber from a hopper provided in the upper part of the rotary crusher, the raw stone captured between the mantle and the corn cave to be rotated is crushed to a predetermined particle size and discharged.

  By the way, regarding the positional relationship between the inner cylinder bush part and the flange part of the eccentric sleeve assembly, the type in which the flange part is fixed to the upper part of the inner cylinder bush part (hereinafter referred to as the upper open maintenance type), the flange part is the inner cylinder. A type fixed to the lower portion of the bush portion (hereinafter referred to as a lower open maintenance type) is known. For example, Patent Document 1 discloses a top open maintenance type rotary crusher, and Patent Document 2 discloses a bottom opening maintenance type rotary crusher.

  An open top maintenance type rotary crusher is excellent in maintainability, but it is difficult to control the amount of oil supplied to maintain a healthy oil film in each bearing portion. On the other hand, the lower open maintenance type rotary crusher is easy to control the amount of oil supplied to maintain a healthy oil film in each bearing portion, but has low maintainability.

JP 2014-108390 A Unexamined-Japanese-Patent No. 5-345136

  The present invention has been made in consideration of such points. An object of the present invention is to provide an oil supply structure of a rotary crusher that enables an oil supply amount control for maintaining a healthy oil film in a bearing portion while being an upper open maintenance type excellent in maintainability.

The fueling structure according to the invention is
A lower frame assembly having an outer cylinder bush portion, an eccentric sleeve assembly having an inner cylinder bush portion which is engaged with the outer cylinder bush portion and rotated and a flange portion fixed to an upper portion of the inner cylinder bush portion; A spindle assembly that holds a mantle that is rotated by being fitted to the inner cylinder bush portion, and a rotational power transmission system that transmits rotational power to the flange portion, and between the rotating mantle and the cone cable In a rotary type crusher for crushing an object to be crushed, a first bearing portion between the main shaft assembly and the inner cylinder bush portion and a second bearing portion between the inner cylinder bush portion and the outer cylinder bush portion Each of which has a lubricating structure for supplying lubricating oil,
An annular thrust seal disposed inside the lower frame assembly and supporting the lower end of the inner cylinder bush from below;
A first refueling inlet opening at the bottom of the lower frame assembly to refuel the first bearing portion;
A second refueling inlet opening in an inner peripheral surface of the outer cylinder bush so as to refuel the second bearing;
Have
The thrust seal includes a flow passage of lubricating oil supplied from the first oil supply inlet to the first bearing portion, and a flow passage of lubricating oil supplied from the second oil supply inlet to the second bearing portion. It is separated.

  In the oil supply structure according to the present invention, the upper end portion of the outer cylinder bush portion may be provided with a thrust bearing which supports the flange portion from below.

  In the oil supply structure according to the present invention, the upper end portion of the outer cylinder bush portion may not be provided with a thrust bearing for supporting the flange portion from below.

  In the fueling structure according to the present invention, a stepped portion is convexly provided on the outer diameter side of the thrust seal, and an inner peripheral surface of the stepped portion surrounds an outer peripheral surface of a lower end portion of the inner cylinder bush portion. Also good.

The rotary crusher according to the invention is
A lower frame assembly having an outer cylinder bush part;
An eccentric sleeve assembly having an inner cylinder bush part that is fitted and rotated in the outer cylinder bush part and a flange part fixed to the upper part of the inner cylinder bush part;
A main shaft assembly for holding a mantle which is engaged with the inner cylinder bush and rotated;
A rotational power transmission system for transmitting rotational power to the flange portion;
Equipped with
A rotary crusher for crushing an object to be crushed between a rotating mantle and a cone cave, comprising:
The oil supply structure for supplying lubricating oil to the first bearing between the main shaft assembly and the inner cylinder bush and the second bearing between the inner cylinder bush and the outer cylinder bush is further provided. Equipped
The fueling structure is
An annular thrust seal disposed inside the lower frame assembly and supporting the lower end of the inner cylinder bush from below;
A first refueling inlet opening at the bottom of the lower frame assembly to refuel the first bearing portion;
A second refueling inlet opening in an inner peripheral surface of the outer cylinder bush so as to refuel the second bearing;
Have
The thrust seal includes a flow passage of lubricating oil supplied from the first oil supply inlet to the first bearing portion, and a flow passage of lubricating oil supplied from the second oil supply inlet to the second bearing portion. It is separated.

  According to the present invention, it is possible to control the amount of oil supply for maintaining a healthy oil film in the bearing portion while being an open top type with excellent maintainability.

FIG. 1 is a longitudinal sectional view showing a rotary crusher according to an embodiment of the present invention. FIG. 2 is an enlarged schematic view showing an oil supply structure in the rotary crusher of FIG. FIG. 3 is a schematic view showing a comparative example of an oil supply structure in an upper open type rotary crusher.

  Specific examples of embodiments of the present invention will be described below with reference to the drawings. In the drawings attached to the present specification, for the sake of illustration and ease of understanding, the scale, the vertical / horizontal dimension ratio, and the like are appropriately changed and exaggerated from those of the actual ones.

  FIG. 1 is a longitudinal sectional view showing a rotary crusher according to an embodiment of the present invention.

  As shown in FIG. 1, the rotary crusher 10 according to the present embodiment includes an upper frame assembly 11 that holds a cone cable 12 and a lower frame that includes an outer cylinder bush portion 13 a that is disposed below the upper frame assembly 11. The assembly 13, the eccentric sleeve assembly 14 that is rotated inside the outer cylinder bush portion 13 a, the main shaft assembly 15 that holds the mantle 17 that is fitted and rotated in the eccentric sleeve assembly 14, and the eccentric sleeve assembly 14 rotates. And a rotational power transmission system 20 that transmits power.

  Among these, the eccentric sleeve assembly 14 includes an inner cylinder bush portion 14a that is rotated by being fitted to the outer cylinder bush portion 13a of the lower frame assembly 13, and a flange portion 14b that is fixed to the upper portion of the inner cylinder bush portion 14a. Have. The flange part 14b extends from the upper part of the inner cylinder bush part 14a to the gear space 40 outside the outer cylinder bush part 13a, and is supported from below by a thrust bearing 19 provided at the upper end part of the outer cylinder bush part 13a. Has been. In the present embodiment, the flange portion 14 b is fixed to the upper portion of the inner cylinder bush portion 14 a, so that the eccentric sleeve assembly 14 can be pulled upward from the lower frame assembly 13. A bevel gear 21a is fixed to the distal end portion of the flange portion 14b. The bevel gear 21a is disposed coaxially with the rotation axis of the inner cylinder bush portion 14a.

  The rotational power transmission system 20 includes a horizontal shaft 22 connected to a drive motor (not shown), and a bevel pinion 21 b fixed to one end of the horizontal shaft 22. The horizontal shaft 22 is oriented in a direction perpendicular to the rotation axis of the inner cylinder bush portion 14a. The bevel pinion 21b fixed to one end of the horizontal shaft 22 is disposed so as to mesh with the bevel gear 21a fixed to the flange portion 14b. When the horizontal shaft 22 and the bevel pinion 21b are rotated together by the rotational power of the drive motor, the rotational power is transmitted from the bevel pinion 21b to the bevel gear 21a, and the bevel gear 21a, the flange portion 14b, and the inner cylinder bush portion 14a. It is integrally driven to rotate around the rotation axis of the inner cylinder bush portion 14a.

  A through-hole extending in a direction inclined with respect to the rotation axis of the inner cylinder bush portion 14a is formed at an eccentric position of the inner cylinder bush portion 14a, and the main shaft assembly 15 is inserted into the through hole of the inner cylinder bush portion 14a. Has been. A funnel-shaped mantle 17 is fixed to the upper part of the main shaft assembly 15.

  In the illustrated example, the rotary crusher 10 is a so-called hydraulic cone crusher, and the upper end of the spindle assembly 15 is supported by a bearing 23 held by the upper frame assembly 11. On the other hand, a spindle step 15a having a convex spherical surface is fixed to the lower end portion of the spindle assembly 15. Under the spindle step 15a, a step washer 13c having a concave spherical surface and wear for supporting the back surface of the step washer 13c. The plates 13 b are stacked and arranged. The wear plate 13 b is fixed to the bottom of the lower frame assembly 13, more specifically, to the ram of the hydraulic cylinder assembly installed below the lower frame assembly 13. A sliding portion in which the convex spherical surface of the main spindle step 15a and the concave spherical surface of the step washer 13c slide is formed.

  When the flange portion 14b of the eccentric sleeve assembly 14 and the inner cylinder bush portion 14a are integrally rotated by the rotational power transmission system 20, the main shaft assembly 15 moves around the rotation axis of the inner cylinder bush portion 14a with the bearing 23 as a fulcrum. The difference is exercised. The mantle 17 is precessed with respect to the cone cave 12 according to the precession of the main shaft assembly 15 so as to crush the object to be crushed supplied to the crushing chamber 18 sandwiched between the mantle 17 and the cone cave 12. It has become.

  During the operation of the rotary crusher 10, the first bearing portion 41 and the inner cylinder bush between the main shaft assembly 15 and the inner cylinder bush portion 14a are used to smoothly precess the main spindle assembly 15 that is subjected to a large load. It is necessary to supply a proper amount of lubricating oil to the second bearing portion 42 between the portion 14a and the outer cylinder bush portion 13a to maintain a healthy oil film. Therefore, the rotary crusher 10 is provided with an oil supply structure 30 for supplying lubricating oil to the first bearing portion 41 and the second bearing portion 42, respectively.

  FIG. 2 is an enlarged schematic view showing the oil supply structure 30. In FIG. 2, the arrow indicates the direction in which the lubricating oil flows.

  As shown in FIG. 2, the oil supply structure 30 is installed inside the lower frame assembly 13 and supplies an annular thrust seal 33 for supporting the lower end portion of the inner cylinder bush portion 14 a from below and the first bearing portion 41. Open to the bottom of the lower frame assembly 13, more specifically, the first oil inlet 31 that opens to the center of the ram of the hydraulic cylinder assembly, and the inner peripheral surface of the outer cylinder bush portion 13 a to supply oil to the second bearing portion 42. And a second refueling inlet 32.

  Specifically, the thrust seal 33 is, for example, a metal ring (ring) having a parallel plate-like longitudinal section. In the illustrated example, an annular thrust seal mounting frame 34 is fixed to the bottom of the lower frame assembly 13 so as to surround the outside of the first oil supply inlet 31. An annular step 35 is protruded from the upper end of the thrust seal mounting frame 34, and the thrust seal 33 is fitted to the inner diameter side of the step 35 and supported from below. The lower end surface of the inner cylinder bush portion 14 a is pressed against the upper surface of the thrust seal 33 by its own weight of the eccentric sleeve assembly 14 and is in surface contact. The lower end surface of the inner cylinder bush portion 14 a is preferably chamfered or planarized in order to widen the contact area with the upper surface of the thrust seal 33.

  In the illustrated example, the through hole 36 is formed to penetrate the central portion of the wear plate 13b and the central portion of the step washer 13c, respectively, and the first oil inlet 31 is opened to the inside of the through hole 36. Yes. As shown in FIG. 2, the lubricating oil introduced into the through hole 36 from the first oil supply inlet 31 is the inner diameter side end of the sliding portion between the wear plate 13b and the step washer 13c, the step washer 13c and the main spindle step. It flows into the inner diameter side end of the sliding part between 15a and lubricates each sliding part. Then, the lubricating oil that has passed through each sliding portion flows out from the outer diameter side end portion of each sliding portion into the annular space 37 outside the lower end portion of the spindle assembly 15, and from the annular space 37, the first bearing portion 41. The first bearing portion 41 is lubricated. The lubricating oil that has passed through the first bearing portion 41 flows out from the upper end portion of the first bearing portion 41 into the gear housing space 40 outside the outer cylinder bush portion 13a, and the lubricating oil that accumulates on the floor of the gear housing space 40 is , And is recovered from the fuel outlet 39 shown in FIG.

  On the other hand, a part of the lubricating oil introduced from the second oil supply inlet 32 to the second bearing portion 42 flows into a region below the second oil supply inlet 32 in the second bearing portion 42 and lubricates the lower region. Let Then, the lubricating oil that has passed through the lower region of the second bearing portion 42 flows out from the lower end portion of the second bearing portion 42 into the annular space 38 provided below, and the lubricating oil that accumulates on the floor of the annular space 38 is , And is recovered from the fuel outlet 39 shown in FIG. Further, the remaining part of the lubricating oil directly introduced from the second oil supply inlet 32 to the second bearing portion 42 flows into the area above the second oil supply inlet 32 in the second bearing portion 42 and the upper area Lubricate. Then, the lubricating oil that has passed through the upper region of the second bearing portion 42 flows out from the upper end portion of the second bearing portion 42 into the gear housing space 40 outside the outer cylinder bush portion 13a and accumulates on the floor of the gear housing space 40. The lubricating oil is recovered from the oil supply outlet 39 shown in FIG.

  Incidentally, FIG. 4 is a schematic view showing a comparative example of an oil supply structure in an upper open type rotary crusher. In FIG. 4, the arrow indicates the direction in which the lubricating oil flows. In the upper open maintenance type rotary crusher as shown in FIG. 4, the flange portion 114b is supported from below by a thrust bearing 119 provided at the upper end portion of the outer cylinder bush portion 113a. A thrust seal is not installed at the lower end of 115a, and is supplied from the first oil supply inlet 131 to the first bearing part 141 and from the second oil supply inlet 132 to the second bearing part 142. The lubricating oil flow path is not structurally separated. In particular, the oil supply outlet side 152 of the second bearing portion 142 and the oil supply inlet side 151 of the first bearing portion 141 are in communication with each other. Therefore, the oil distribution amount to each bearing part 141 and 142 is unstable, and it may be difficult to maintain a healthy oil film especially under adverse conditions.

  On the other hand, as shown in FIG. 2, in the present embodiment, the lower end surface of the inner cylinder bush portion 14 a is in surface contact with the upper surface of the thrust seal 33, thereby forming an annular space 37 outside the lower end portion of the main shaft assembly 15. The annular space 38 provided below the lower end portion of the second bearing portion 42 is structurally separated. Thereby, the flow path of the lubricating oil supplied from the first oil supply inlet 31 to the first bearing portion 41 and the flow path of the lubricating oil supplied from the second oil supply inlet 32 to the second bearing portion 42 are substantially As a result, it is possible to control the amount of oil supply for maintaining a healthy oil film in the first bearing portion 41 and the second bearing portion 42.

  Further, in the present embodiment, the inner peripheral surface of the step portion 35 protruding from the outer diameter side of the thrust seal 33 surrounds the outer peripheral surface of the lower end portion of the inner cylinder bush portion 14 a supported by the thrust seal 33. Yes. The gap between the inner peripheral surface of the step 35 and the outer peripheral surface of the lower end of the inner cylinder bush 14a is preferably narrow. For the lubricating oil infiltrated between the lower end surface of the inner cylinder bush portion 14a and the upper surface of the thrust seal 33, the stepped portion 35 provided on the outer diameter side of the thrust seal 33 functions as a flow resistance. Therefore, even if an outward force is applied to the lubricating oil infiltrated between the lower end surface of the inner cylinder bush portion 14a and the upper surface of the thrust seal 33 with an eccentric motion of the main shaft assembly 15, the lubricating oil is ejected to the outside. This can be suppressed.

  Next, the operation of the rotary crusher 10 according to the present embodiment will be described.

  First, the lubricating oil is supplied from the first oil supply inlet 31 to the first bearing portion 41, and the lubricating oil is supplied from the second oil supply inlet 32 to the second bearing portion 42. In the present embodiment, since the thrust seal 33 structurally separates the flow path of the lubricating oil supplied to the first bearing portion 41 and the flow path of the lubricating oil supplied to the second bearing portion 42, It is possible to supply oil to the first bearing 41 and the second bearing 42 independently, and control the amount of oil supply such that a healthy oil film is maintained in the first bearing 41 and the second bearing 42. Is possible.

  Next, rotational power is transmitted from the rotational power transmission system 20 to the flange portion 14b of the eccentric sleeve assembly 14, and the flange portion 14b and the inner cylinder bush portion 14a are integrally rotated around the rotation axis of the inner cylinder bush portion 14a. . Along with the rotation of the inner cylinder bush portion 14a, the main shaft assembly 15 fitted to the inner cylinder bush portion 14a is precessed about the bearing 23 as a fulcrum. The mantle 17 fixed to the main shaft assembly 15 is precessed with respect to the cone cave 12 according to the precession of the main shaft assembly 15, and the gap between the mantle 17 and the cone cave 12 is changed in a wide and narrow manner with each rotation. .

  Next, an object to be crushed such as a rough stone is fed from the hopper 25 at the upper part of the upper frame assembly 11. The charged material to be crushed falls into a crushing chamber 18 formed between the mantle 17 and the cone cave 12 and is captured between the mantle 17 and the cone cave 12. When the mantle 17 is rotated and the gap between the mantle 17 and the corn cave 12 becomes narrow, the object to be crushed is crushed.

  Thereafter, when the gap between the mantle 17 and the corn cave 12 is widened, the material to be crushed falls in the crushing chamber 18 to a portion where the gap between the mantle 17 and the corn cave 12 becomes wider, and the mantle 17 and the corn cave 12. When the gap between is narrowed again, it is further crushed. The material to be crushed gradually becomes fine by repeating crushing and dropping, becomes a product of a predetermined particle size, falls to the floor through the gap between the mantle 17 and the corn cave 12, and is discharged from the opening of the floor to the outside of the machine. Is done.

  During operation of the rotary crusher 10, the oil supply amount is controlled so that a healthy oil film is maintained in the first bearing portion 41 and the second bearing portion 42, thereby reducing the replacement frequency of the lubricating oil. At the same time, the bearing portions 41 and 42 can be prevented from being damaged due to seizure or the like.

  According to the present embodiment as described above, since the flange portion 14b of the eccentric sleeve assembly 14 is fixed to the upper portion of the inner cylinder bush portion 14a, the eccentric sleeve assembly 14 can be pulled upward from the lower frame assembly 13. If the bearing portions 41 and 42 and the gears 21a and 21b are damaged, the eccentric sleeve assembly 14 can be pulled upward to perform maintenance work on the bearing portions 41 and 42 and the gears 21a and 21b. it can. Therefore, it is not necessary to disassemble the hydraulic cylinder assembly arranged below the lower frame assembly 13, and there is no need for a dangerous work performed by an operator under the suspended load, which is superior to the lower open maintenance type. Maintainability is obtained.

  Further, according to the present embodiment, the annular thrust seal 33 installed inside the lower frame assembly 13 and supporting the lower end portion of the inner cylinder bush portion 14a from below is the first bearing portion from the first fuel inlet 31. Since the flow path of the lubricating oil supplied to 41 and the flow path of the lubricating oil supplied from the second oil supply inlet 32 to the second bearing portion 42 are separated, the first bearing portion 41 and the second bearing are separated. Oil supply amount control for maintaining a healthy oil film in the unit 42 is possible. As a result, the frequency of replacement of the lubricating oil is reduced, and breakage of the bearing portions 41, 42 due to seizing or the like can be prevented.

  Further, according to the present embodiment, the inner peripheral surface of the stepped portion 35 surrounds the outer peripheral surface of the lower end portion of the inner cylindrical portion 14 a, and between the lower end surface of the inner cylindrical bush portion 14 a and the upper surface of the thrust seal 33. The step portion 35 functions as a flow resistance for the lubricating oil infiltrated into. Therefore, even if an outward force is applied to the lubricating oil infiltrated between the lower end surface of the inner cylinder bush portion 14a and the upper surface of the thrust seal 33 with the eccentric motion of the main shaft assembly 15, the lubricating oil jets outward. This can be suppressed.

  In addition, according to the present embodiment, since the thrust bearing 19 that supports the flange portion 14b from below is provided at the upper end portion of the outer cylinder portion 13a, the load of the eccentric sleeve 14 causes the thrust seal 33 and the thrust bearing 19 to load. And distributed. Thereby, the wear of the thrust seal 33 can be delayed.

  Note that the thrust bearing 19 is not necessarily provided at the upper end portion of the outer cylindrical portion 13a. That is, the thrust bearing 19 can be omitted from the upper end portion of the outer cylinder portion 13a.

  In the aspect in which the thrust bearing 19 is provided at the upper end portion of the outer cylinder portion 13a, in some cases, the load applied from the lower end surface of the inner cylinder portion 14a to the upper surface of the thrust seal 33 may be insufficient, or the inner tolerance may be increased due to assembly tolerances. There is a possibility that a gap may be formed between the lower end surface of the cylindrical portion 14a and the upper surface of the thrust seal 33.

  On the other hand, in a mode in which the thrust bearing 19 is omitted from the upper end portion of the outer cylinder portion 13a, a sufficient load is applied from the lower end surface of the inner cylinder portion 14a to the upper surface of the thrust seal 33, so that the first bearing portion 41 is supplied. It can be ensured more reliably that the flow path of the lubricating oil and the flow path of the lubricating oil supplied to the second bearing portion 42 are separated.

  In the example shown in FIG. 1, the rotary crusher 10 is a so-called hydraulic cone crusher, but is not limited thereto. For example, it is possible to apply the oil supply structure 30 according to the present embodiment also to a mechanical (Simon's type) cone crusher.

DESCRIPTION OF SYMBOLS 10 Rotating type crusher 11 Upper frame assembly 12 Cone cave 13 Lower frame assembly 13a Outer cylinder bush part 13b Wear plate 13c Step washer 14 Eccentric sleeve assembly 14a Inner cylinder bush part 14b Flange part 15 Spindle assembly 15a Spindle step 17 Mantle 18 Crushing chamber 19 Thrust bearing 20 Rotational power transmission system 21a Bevel gear 21b Bevel pinion 22 Horizontal shaft 23 Bearing 25 Hopper 30 Oil supply structure 31 First oil inlet 32 Second oil inlet 33 Thrust seal 34 Thrust seal mounting frame 35 Step portion 36 Through hole 37 Annular space 38 annular space 39 oil supply outlet 40 gear space 41 first bearing portion 42 second bearing portion

Claims (5)

A lower frame assembly having an outer cylinder bush part and a bottom part , an eccentric sleeve assembly having an inner cylinder bush part that is fitted and rotated in the outer cylinder bush part, and a flange part fixed to the upper part of the inner cylinder bush part A spindle assembly for holding a mantle that is rotated by being fitted to the inner cylinder bush portion, and a rotational power transmission system that transmits rotational power to the flange portion, and a rotating mantle and a cone cable In a rotary crusher for crushing the object to be crushed, a first bearing part between the main shaft assembly and the inner cylinder bush part and a second between the inner cylinder bush part and the outer cylinder bush part An oil supply structure for supplying lubricating oil to the bearing parts,
Cyclic said supported from below by the upper end portion of the thrust seal mounting frame ring that is fixed to the bottom portion of Oite the lower frame assembly on the inside of the lower frame assembly, for supporting the lower end of the inner cylinder bush from below Thrust seal, and
A first refueling inlet opening at the bottom of the lower frame assembly to refuel the first bearing portion;
A second refueling inlet opening in an inner peripheral surface of the outer cylinder bush so as to refuel the second bearing;
Have
The thrust seal includes a flow path of lubricating oil supplied from the first oil supply inlet to the first bearing portion, and a flow path of lubricating oil supplied from the second oil supply inlet to the second bearing portion. Oiling structure characterized by being separated. The oil supply structure according to claim 1, wherein a thrust bearing for supporting the flange portion from below is provided at an upper end portion of the outer cylinder bush portion. The oil supply structure according to claim 1, wherein a thrust bearing that supports the flange portion from below is not provided at an upper end portion of the outer cylinder bush portion. A step is convexly provided on the outer diameter side of the thrust seal, and an inner peripheral surface of the step surrounds the outer peripheral surface of the lower end of the inner cylinder bush. Refueling structure according to any one of 1 to 3. A lower frame assembly having an outer cylinder bush part and a bottom part ;
An eccentric sleeve assembly having an inner cylinder bush part that is fitted and rotated in the outer cylinder bush part and a flange part fixed to the upper part of the inner cylinder bush part;
A main shaft assembly that holds a mantle that is rotated by being fitted to the inner cylinder bush portion; a rotational power transmission system that transmits rotational power to the flange portion;
Equipped with
A rotary crusher for crushing an object to be crushed between a rotating mantle and a cone cave, comprising:
The oil supply structure for supplying lubricating oil to the first bearing between the main shaft assembly and the inner cylinder bush and the second bearing between the inner cylinder bush and the outer cylinder bush is further provided. Equipped
The fueling structure is
Cyclic said supported from below by the upper end portion of the thrust seal mounting frame ring that is fixed to the bottom portion of Oite the lower frame assembly on the inside of the lower frame assembly, for supporting the lower end of the inner cylinder bush from below Thrust seal, and
A first refueling inlet opening at the bottom of the lower frame assembly to refuel the first bearing portion;
A second refueling inlet opening in an inner peripheral surface of the outer cylinder bush so as to refuel the second bearing;
Have
The thrust seal includes a flow passage of lubricating oil supplied from the first oil supply inlet to the first bearing portion, and a flow passage of lubricating oil supplied from the second oil supply inlet to the second bearing portion. A rotary crusher characterized by separation.

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