JP3866644B2 - Rotating crusher and operation method of rotatory crusher - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary crusher and a method of operating a rotary crusher, and more specifically, even if a slidable dust seal ring constituting a dust seal structure expands and deforms due to frictional heat, dust from the crushing chamber is generated. The present invention relates to a rotary crusher and a method of operating a rotary crusher that can prevent intrusion into a lubricating oil circulation part under a main shaft such as an eccentric bearing or a lower body bearing.
[0002]
[Prior art]
FIG. 7 is a cross-sectional view showing a configuration of a main part of a conventional rotary crusher.
[0003]
The rotary crusher includes a spindle assembly head that is provided with a mantle on the upper part of the spindle, and the spindle assembly head is eccentrically swiveled inside the fixed cone cave to feed the crushing material supplied from above to the cone cable. And crushing in the gap between the mantle and the mantle. 7 is an example of a cone crusher. In FIG. 7, reference numeral 16 denotes an upper body frame, and the upper body frame 16 is continuously provided on a lower body frame 17 placed on a gantry (not shown). On the upper body frame 16, an inlet hopper (not shown) serving as an inlet for crushing raw materials such as raw stones and rocks is provided. In the upper body frame 16, a cone cave 18 having a truncated conical tube shape is mounted.
[0004]
An eccentric (eccentric shaft) 19 having an eccentric shaft hole penetrating in the vertical direction is rotatably fitted in the boss portion 17a of the lower body frame 17. The lower part of the main shaft 12 is inserted into the eccentric shaft hole of the eccentric 19. An eccentric bearing (eccentric bearing) 20 is provided between the lower portion of the main shaft 12 and the eccentric 19. Further, a lower body bearing 21 is provided between the eccentric 19 and the boss portion 17a. The lower end of the main shaft 12 is supported by a lower bearing 22 such as a thrust bearing, and the lower bearing 22 is supported by a piston 24 of a main shaft elevating hydraulic cylinder 23 provided continuously with the lower end of the boss portion 17a. The upper end of the main shaft 12 is supported by an upper bearing (spider bearing) 25 such as a radial bearing, and the upper bearing 25 is supported by a plurality of spider arms 26 provided on the upper body frame 16.
[0005]
A mantle 14 having a truncated conical tube shape is mounted on the main shaft 12 via a head center (mantle turret) 13 on an upper portion of the main shaft that performs an eccentric turning motion. Thereby, the spindle assembly head 11 including the spindle 12, the head center 13, and the mantle 14 is configured. A crushing chamber 15 is formed between the mantle 14 and the corn cave 18. The spindle assembly head 11 may have a structure in which the spindle 12 and the head center 13 are integrated.
[0006]
A driven bevel gear 27 is attached to the lower end of the eccentric 19 through which the main shaft 12 is inserted. A driven bevel gear 29 provided at the inner end of the horizontal rotating shaft 28 is attached to the driven bevel gear 27. Meshed. The horizontal rotary shaft 28 is supported by a casing attached to the lower body frame 17 via a bearing, and is connected to an outer end of the horizontal rotary shaft 28 in conjunction with an electric motor (not shown) via a belt (not shown). A belt wheel 30 is attached.
[0007]
In the rotary crusher, the lubricating oil from the lubricating oil tank is sent to each bearing through a lubricating pump, an oil filter, an oil cooler, etc., and then returned to the lubricating oil tank (not shown). Equipped with equipment. By this circulation type lubrication device, the lubricating oil from the lubricating oil tank is supplied to the eccentric bearing 20 and the lower body bearing 21, and through a route different from the oil supply route to these bearings 20, 21. Lubricating oil is also supplied to the lower bearing 22 from the lubricating oil tank. In this rotary crusher, the eccentric bearing 20, the lower body bearing 21, and the lower bearing 22 constitute a lubricating oil circulation section below the main shaft.
[0008]
Next, the dust seal structure will be described. The dust seal structure blocks the communication between the crushing chamber 15 and the above-described lubricating oil circulation portion below the main shaft, thereby preventing dust from crushing the raw material in the crushing chamber 15 from entering the lubricating oil circulation portion below the main shaft. Is for. The dust seal structure includes a cylindrical body (dust color) 1, an engagement groove 2, and a dust seal ring 4.
[0009]
The cylindrical body 1 is provided immediately below the head center 13 so as to surround the outer periphery of the lower portion of the main shaft 12 and its bearings 20 and 21, and the lower end is attached to the lower body frame 17. The engagement groove 2 provided in the vicinity of the lower end of the head center 13 is formed in an annular shape by the annular stepped portion of the head center 13 and the annular retainer ring 3 and extends downward while inclining radially inward. Thus, the groove space is formed. The dust seal ring 4 has an annular shape and extends downward while inclining radially inward, the outer peripheral side engages with the engaging groove 2, the inner peripheral surface abuts on the outer peripheral surface of the cylindrical body 1, and the lower surface Is in contact with the lower surface of the engagement groove 2 (the upper surface of the retainer ring 3) and is slidable with respect to the cylindrical body 1 and the engagement groove 2.
[0010]
In this case, the material of the dust seal ring 4 is required to have excellent self-lubricating properties, low sliding resistance, and hardness sufficient to ensure wear resistance. In consideration of cost, generally, a polyamide resin is used. Hard nylon material such as is used.
[0011]
The operation of the rotary crusher configured as described above will be described. The horizontal rotary shaft 28 is rotated, thereby rotating the eccentric 19 via the driven bevel gear 27. By rotating the eccentric 19, the axis of the eccentric 19 (the axis of the airframe) and the axis of the main shaft 12 are shifted so as to intersect at an eccentric center point located above the main shaft assembly head 11. The assembly head 11 performs an eccentric turning motion (eccentric turning motion), which is a “slashing motion”. In this case, when viewed in a cross-sectional view, the movement of the spindle assembly head 11 is a swinging movement. When the eccentric rotation movement of the spindle assembly head 11 causes the gap between the cone cave 18 and the mantle 14 to be reduced or increased repeatedly, the crushing raw material supplied to the crushing chamber 15 has a reduced gap. When it is crushed and the gap becomes large, it moves downward along the inclination of the mantle 14. Such operations are repeated several times to obtain a predetermined particle size, which is discharged outside the apparatus. The number of swinging motions of the spindle assembly head 11 is about 240 to 360 times / minute, although it varies depending on the machine size. During crushing of the crushing raw material, the spindle assembly head 11 itself also rotates at a speed of about 10 to 15 times / min due to the reaction force of crushing the crushing raw material.
[0012]
The dust seal structure cuts off the communication between the crushing chamber 15 and the lubricating oil circulation part at the lower part of the main shaft, and prevents dust from being crushed in the crushing chamber 15 from entering the lubricating oil circulation part at the lower main shaft. Like to do. In this case, the dust seal ring 4 slides in the engagement groove 2 in the radial direction while the inner peripheral surface is in contact with the outer peripheral surface of the cylindrical body 1 by the swinging motion of the spindle assembly head 11. At this time, the dust seal ring 4 is in contact with the lower surface of the engaging groove 2, that is, the upper surface of the retainer ring 3 for forming the engaging groove 2 by its own weight. Further, the dust seal ring 4 slides in the circumferential direction in contact with the outer peripheral surface of the cylindrical body 1 and the upper surface of the retainer ring 3 by the rotational movement of the spindle assembly head 11.
[0013]
In some cone crushers, the spindle assembly head is supported by a spherical thrust bearing disposed on the lower surface of the head center. In this structure, the spherical thrust bearing is fixed to the upper end to support the spherical thrust bearing, and the thrust support attached to the lower body frame at the lower end corresponds to the cylindrical body 1 in FIG. The thrust bearing, the eccentric bearing, the lower fuselage bearing, and the eccentric thrust bearing constitute a lubricating oil circulation section below the main shaft.
[0014]
[Patent Document 1]
Japanese Patent No. 314519 (FIG. 1)
[Patent Document 2]
JP-A-5-345136 (FIG. 3)
[0015]
[Problems to be solved by the invention]
However, in the above-described conventional rotary crusher, the frictional heat generated by the sliding is generated in the dust seal ring 4 that slides due to the eccentric turning motion of the spindle assembly head 11, and the inner diameter of the dust seal ring 4 made of hard nylon is generated. Expanded due to thermal expansion, and a gap was formed between the inner peripheral surface of the dust seal ring 4 and the outer peripheral surface of the cylindrical body 1.
[0016]
For this reason, the dust seal effect is impaired, and as shown in FIG. 8, dust from the crushing chamber 15 enters the inside of the cylindrical body 1 through the gap and is mixed into the lubricating oil in the main spindle lower lubricating oil circulation section. However, there has been a problem that deterioration of the lubricating oil, seizure of the bearing, premature wear of the lubrication pump of the circulating lubrication device, and the like are caused. The dust seal ring 4 made of a hard nylon material is excellent in impact resistance, wear resistance, self-lubrication, etc., but has a large degree of expansion and contraction due to temperature change (thermal expansion coefficient: about 100 to 150). × 10 ^-6 / ° C).
[0017]
Accordingly, an object of the present invention is to provide a lubricating oil circulating portion of the main spindle lower side of dust from the crushing chamber even if the slidable dust sealing ring constituting the dust sealing structure expands and deforms due to frictional heat due to the eccentric swiveling motion of the main spindle assembly head. It is an object to provide a rotary crusher and a method of operating a rotary crusher that can prevent intrusion.
[0018]
[Means for Solving the Problems]
In order to achieve the object, the present invention takes the following technical means.
[0019]
The invention of claim 1 includes a main shaft (12) the spindle assembly head (11) formed by providing a mantle (14) on top of, provided so as to surround the main shaft (12) at the underside of the mantle (14) A cylindrical body (1) attached to the lower body frame (17); an engagement groove formed at the lower end of the spindle assembly head (11) and extending downward while inclining radially inward. (2) and an annular shape extending downward while inclining inward in the radial direction, the outer peripheral side is engaged with the engagement groove (2) through a minute gap upward, and the inner peripheral surface is the cylinder The lower surface of the cylindrical body (1) is opposed to the lower surface of the engagement groove (2) and is slidable with respect to the cylindrical body (1) and the engagement groove (2). a provided a dust seal ring (5), the crushing chamber (15) with the lubricating oil circulating section (20 Comprising a dust seal structure for blocking the communication between the 2), the inner with the spindle assembly head (11) eccentric pivot while small vertical movement to the main shaft assembly head (11) is generated a fixed Konkebu (18) In a rotary crusher that moves and crushes crushing raw material supplied from above in a crushing chamber (15) between a corn cave (18) and a mantle (14) , the dust seal ring ( 5) has an annular groove (5a) along the circumferential direction on the inner peripheral surface thereof, and an annular groove is formed in the annular groove (5a) at one end of the ring body. 6a) is integrally formed of an elastic material with a V-shaped cross section, and the lip portion (6a) is elastically in close contact with the outer peripheral surface of the cylindrical body (1) on the inner peripheral side. The opposite side of the body (1) A seal ring (6) that contacts the groove surface of the groove (5a) is mounted, and the annular groove (5a) is located between the seal ring (6) when the seal ring (6) is mounted. The spindle assembly head (11) generates a clearance in the vertical direction, and the dust seal ring (5) follows the minute vertical movement of the spindle assembly head (11) to lower the engagement groove (2). The rotary crusher is characterized in that it is formed with a groove width that can hold the contact state with .
[0020]
The invention of claim 2 comprises a spindle assembly head (11) having a mantle (14) provided on the upper part of the spindle (12), and the spindle assembly head (11) is placed inside the fixed cone cave (18). The assembly head (11) is eccentrically swung while generating a minute vertical movement, and the crushing material supplied from above is crushed in the crushing chamber (15) between the cone cave (18) and the mantle (14). When operating the dynamic crusher, a cylindrical body (1) provided to surround the main shaft (12) below the mantle (14) and attached to the lower fuselage frame (17); An engaging groove (2) formed at the lower end of the spindle assembly head (11) and extending downward while forming an annular shape and inclining radially inward, and downwardly forming an annular shape and inclining radially inward And the outer peripheral side is slightly upward Engaging with the engaging groove (2) through a gap, and having an annular groove (5a) along the circumferential direction on the inner peripheral surface, the inner peripheral surface being the outer peripheral surface of the cylindrical body (1) A dust seal ring (5) which faces the lower surface of the engagement groove (2) and is slidable with respect to the cylindrical body (1) and the engagement groove (2). The ring-shaped cylindrical lip portion (6a) is integrally formed at one end of the ring body and is made of an elastic material with a V-shaped cross section. The lip portion (6a) is cylindrical on the inner peripheral side. The dust seal ring (5) is elastically in close contact with the outer peripheral surface of the body (1) and the surface opposite to the cylindrical body (1) is in contact with the groove surface of the annular groove (5a). Mounted in the annular groove (5a), and the mounting creates a vertical gap between the annular groove (5a). The dust seal structure comprising a seal ring (6) that causes the dust seal ring (5) to follow the minute vertical movement of the spindle assembly head (11) and engage with the dust seal ring (5). The contact state with the lower surface of the groove (2) is maintained, the communication between the crushing chamber (15) and the lubricating oil circulation section (20-22) is blocked, and the dust from the crushing chamber (15) is circulated in the lubricating oil. It is the operation method of the rotation type crusher characterized by crushing a crushing raw material, preventing intrusion into a part (20-22) .
[0022]
In the rotary crusher and the operation method thereof according to the present invention, when the communication between the crushing chamber and the lubricating oil circulation part at the lower part of the main shaft is cut off by the dust seal structure, the inner circumferential surface as a dust seal ring is circular along the entire circumference. A dust seal ring with a groove is provided, and a seal ring made of an elastic material is mounted in the annular groove of the dust seal ring so as to be in close contact with the outer peripheral surface of the cylindrical body. It seems to be elastically intimate. As a result, even if the inner diameter of the dust seal ring is enlarged by frictional heat due to the eccentric swiveling motion of the spindle assembly head and a gap is generated between the inner peripheral surface of the dust seal ring and the outer peripheral surface of the cylindrical body, Can prevent dust from entering the inside of the cylindrical body.
[0023]
By the way, in the rotary crusher, the action of the load on the spindle assembly head generated at the time of crushing and the hydraulic operation sealed in the hydraulic part (the spindle lifting hydraulic cylinder 23) supporting the spindle assembly head at the lower end of the spindle. Due to the influence of the bulk modulus of the oil, the spindle assembly head causes a minute vertical movement separately from the eccentric swivel motion. Thus, a minute vertical movement occurs in the spindle assembly head.
[0024]
Therefore, in the present invention, the seal ring mounted in the annular groove of the dust seal ring is sized so as to have a clearance in the machine body axial direction (vertical direction) with respect to the annular groove (FIGS. 2 and 2). 3). The surface of the seal ring opposite to the cylindrical body is in contact with the groove surface of the annular groove.
[0025]
Here, when the seal ring is mounted without providing the clearance in the annular groove of the dust seal ring, when the spindle assembly head is slightly lowered, the dust seal ring is slightly lowered by its own weight, and the lower surface of the dust seal ring is the head center. Even if it tries to contact the lower surface of the engagement groove, the dust seal ring cannot follow the slight descent of the spindle assembly head and is lifted by the seal ring because of the large sliding resistance against the cylindrical body of the seal ring (See FIG. 6). As a result, a minute gap is generated between the lower surface of the dust seal ring and the lower surface of the engagement groove, and dust may enter through this gap.
[0026]
On the other hand, in the present invention, since the seal ring is mounted with the clearance in the annular groove of the dust seal ring, even if the spindle assembly head is slightly lowered, the dust seal ring is small in the spindle assembly head. Following the downward movement, the contact state with the lower surface of the engagement groove can be maintained without being interrupted by the seal ring (see FIG. 4). The dimension of the play in the machine body axis direction (vertical direction) is determined so that the dust seal ring can follow the minute vertical movement of the spindle assembly head.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. 1 is a cross-sectional view showing a configuration of a main part of a rotary crusher according to an embodiment of the present invention, FIG. 2 is a cross-sectional view for explaining a dust seal structure in FIG. 1, and FIG. 3 is an enlarged main part of FIG. FIG. Here, the same parts as those of the conventional rotary crusher shown in FIG.
[0028]
As shown in FIGS. 1 to 3, the dust seal structure in the rotary crusher includes a cylindrical body 1, an engagement groove 2, a dust seal ring 5, and a seal ring (V ring) 6. The cylindrical body 1 is provided so as to surround the outer periphery of the lower portion of the main shaft 12 and its bearings 20 and 21 immediately below the head center 13 (a component of the main shaft assembly head 11), and the lower end of the cylindrical member 1 It is attached. The engagement groove 2 provided in the vicinity of the lower end of the head center 13 is formed in an annular shape by an annular stepped portion of the head center 13 and an annular retainer ring 3 (a component of the spindle assembly head 11). The groove space is formed so as to extend downward while inclining inward.
[0029]
The dust seal ring 5 is made of polyamide resin (nylon), has an annular shape, and extends downward while inclining radially inward. The outer peripheral side engages with the engaging groove 2, the inner peripheral surface faces the outer peripheral surface of the cylindrical body 1, and the lower surface abuts on the lower surface of the engaging groove 2 (the upper surface of the retainer ring 3); The cylindrical body 1 and the engaging groove 2 are slidably provided.
[0030]
The seal ring (V ring) 6 is positioned in the annular groove 5a of the dust seal ring 5 in such a manner that the inner peripheral side is in close contact with the outer peripheral surface of the cylindrical body 1, and the machine body axis line with respect to the annular groove 5a It is mounted with a clearance S in the direction (vertical direction). That is, the annular groove 5a of the dust seal ring 5 is formed with an opening width (groove width) that creates a gap in the vertical direction with the seal ring (V ring) 6 when the seal ring (V ring) 6 is mounted. Has been. In this embodiment, as an example of the seal ring, a rubber V ring 6 made of elastic chloroprene rubber is used. The V ring 6 has a V-shaped cross section formed by integrally forming a truncated cone-shaped lip portion 6a at one end of the ring body, and the lip portion 6a is elastically in close contact with the outer peripheral surface of the cylindrical body 1. The surface opposite to the cylindrical body 1 is in contact with the groove surface of the annular groove 5a.
[0031]
According to the rotary crusher of this embodiment configured as described above, the V ring 6 is mounted in the annular groove 5a of the dust seal ring 5 so as to elastically contact the outer peripheral surface of the cylindrical body 1. Therefore, even if the inner diameter of the dust seal ring 5 is expanded by frictional heat due to the eccentric turning motion of the spindle assembly head 11 and a gap is generated between the inner peripheral surface of the dust seal ring 5 and the outer peripheral surface of the cylindrical body 1, V The ring 6 and the cylindrical body 1 are in close contact with each other, and dust from the crushing chamber can be prevented from entering the inside of the cylindrical body 1.
[0032]
In this case, as shown in FIG. 5, when the V ring 6 is mounted without providing a clearance in the annular groove 31a of the dust seal ring 31, when the spindle assembly head 11 is slightly lowered, the dust seal ring 31 is Even if the dust seal ring 31 is lowered slightly by its own weight and the lower surface of the dust seal ring 31 attempts to contact the lower surface of the engagement groove 2 (the upper surface of the retainer ring 3), the dust seal ring 31 has a large sliding resistance against the cylindrical body 1 of the V ring 6. Cannot follow the slight descent of the spindle assembly head 11 and may be lifted by the V-ring 6 as shown in FIG. As a result, a minute gap is formed between the lower surface of the dust seal ring 31 and the lower surface of the engagement groove 2, and dust may enter through this gap.
[0033]
On the other hand, in the rotary crusher of this embodiment, since the V-ring 6 is mounted with the play S in the annular groove 5a of the dust seal ring 5 (see FIG. 3), the spindle assembly head 11 The dust seal ring 5 can follow the minute descent of the spindle assembly head 11 without being obstructed by the V ring 6 and can maintain the contact state with the lower surface of the engagement groove 2 even if it is slightly lowered. (See FIG. 4).
[0034]
Next, a description will be given of test operation results obtained by operating the rotary crusher of the present embodiment and specifically examining the effect of the dust seal structure.
[0035]
Normally, an oil filter is installed in the lubrication line of the circulating lubricator, and dust that is larger than the opening of the oil filter is collected and removed from the dust mixed in the lubricating oil. Yes. Also, clogging of the oil filter
This can be determined by a differential pressure switch between the lubricating oil inlet and outlet of the oil filter. The test operation was carried out in a state where the oil filter was intentionally clogged using a finer one than that normally used as an oil filter.
[0036]
As a result, clogging occurred in the oil filter of the circulating lubrication device in about 40 hours during the operation with the conventional crusher having the dust seal structure. On the other hand, in the operation using the rotary crusher provided with the dust seal structure according to the present invention, the continuous operation could be performed without causing clogging for 480 hours or more.
[0037]
In addition, although the example of the cone crusher was described in this embodiment, this invention is applicable also to a gyratory crusher.
[0038]
【The invention's effect】
As described above, according to the operation method of the rotary crusher and the rotary crusher according to the present invention, even if the slidable dust seal ring constituting the dust seal structure is expanded and deformed by frictional heat , Even if a slight vertical movement occurs in the spindle assembly head that is eccentrically swiveling , dust from the crushing chamber enters the lubricating oil circulation section under the spindle, such as eccentric bearings and lower fuselage bearings that support the spindle assembly head. This reduces the time and effort required for maintenance of the bearings that support the spindle assembly head, lubricating oil, and the lubrication pump of the circulating lubrication system, and improves the operating rate of the rotary crusher. Can contribute.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a main part of a rotary crusher according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view for explaining a dust seal structure in FIG.
FIG. 3 is an enlarged view of a main part of FIG. 2;
FIG. 4 is a cross-sectional view for explaining a dust seal structure according to the present invention.
FIG. 5 is a cross-sectional view for explaining a dust seal structure when there is no play.
FIG. 6 is a cross-sectional view for explaining that dust enters when there is no play.
FIG. 7 is a cross-sectional view showing a configuration of a main part of a conventional rotary crusher.
FIG. 8 is a cross-sectional view for explaining dust intrusion in a conventional rotary crusher.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Cylindrical body 2 ... Engagement groove 3 ... Retainer ring 5 ... Dust seal ring 5a ... Annular groove 6 ... V ring 6a ... Lip part 11 ... Main shaft assembly head 12 ... Main shaft 13 ... Head center 14 ... Mantle 15 ... Crushing chamber 16 ... Upper fuselage frame 17 ... Lower fuselage frame 17a ... Boss part of lower fuselage frame 18 ... Cone cave 19 ... Eccentric 20 ... Eccentric bearing 21 ... Lower fuselage bearing 22 ... Lower bearing 23 ... Hydraulic cylinder for elevating shaft 24 ... Piston 25 ... Upper bearing 26 ... Spider arm 27 ... Driven bevel gear 28 ... Horizontal rotating shaft 29 ... Drive bevel gear 30 ... V belt wheel

Claims (2)

Spindle and mantle (14) is provided and becomes spindle assembly head (11) at the top (12), the mantle (14) so provided as to surround the main shaft (12) at the lower side of the lower body frame (17) A cylindrical body (1) attached to the shaft, an engagement groove (2) formed at the lower end of the spindle assembly head (11) and extending downward while inclining radially inward, and a circle It has an annular shape and extends downward while inclining inward in the radial direction. The outer peripheral side engages with the engagement groove (2) through a minute gap upward, and the inner peripheral surface is the outer periphery of the cylindrical body (1). A dust seal ring (5) facing the surface and having a lower surface in contact with a lower surface of the engagement groove (2) and slidable with respect to the cylindrical body (1) and the engagement groove (2). ) a, shielding the communication of the crushing chamber (15) the lubricating oil circulating section (20 to 22) To provided a dust seal structure, and with inner small vertical movement in the spindle assembly head (11) of the main shaft assembly head (11) is eccentrically orbiting movement while generating at a fixed Konkebu (18), supplied from above In a rotary crusher that crushes the crushing raw material to be crushed in a crushing chamber (15) between a corn cave (18) and a mantle (14) ,
The dust seal ring (5) constituting the dust seal structure has an annular groove (5a) along the circumferential direction on the inner peripheral surface thereof. A lip portion (6a) having a truncated cone shape integrally formed at one end is made of an elastic material with a V-shaped cross section, and the lip portion (6a) is an outer peripheral surface of the cylindrical body (1) on the inner peripheral side. A seal ring (6), which is elastically in close contact with the cylindrical body (1) and is in contact with the groove surface of the annular groove (5a), is mounted on the annular groove (5a). When the seal ring (6) is mounted, a clearance is generated in the vertical direction of the spindle assembly head (11) with the seal ring (6), and the dust seal ring (5) is assembled with the spindle assembly. The engagement groove follows the minute vertical movement of the head (11). Gyratory crusher, characterized in that only formed by the groove width of may retain contact between the lower surface of 2). A spindle assembly head (11) having a mantle (14) provided on the upper part of the spindle (12) is provided, and the spindle assembly head (11) is minutely attached to the spindle assembly head (11) inside a fixed cone cave (18). The rotary crusher is operated to crush the crushing raw material supplied from above in the crushing chamber (15) between the corn cave (18) and the mantle (14) by causing an eccentric swivel movement while generating vertical movement. On the occasion
A cylindrical body (1) provided on the lower side of the mantle (14) so as to surround the main shaft (12) and attached to the lower body frame (17), and a lower end of the main shaft assembly head (11) An engaging groove (2) formed in a circular portion and extending downward while inclining inward in the radial direction, and extending downward while inclining inwardly in the radial direction, with the outer peripheral side being minute upward It engages with the engagement groove (2) through a gap, and has an annular groove (5a) along the circumferential direction on the inner peripheral surface, and the inner peripheral surface faces the outer peripheral surface of the cylindrical body (1). And a dust seal ring (5) provided with a lower surface in contact with a lower surface of the engagement groove (2) and slidable with respect to the cylindrical body (1) and the engagement groove (2), A cross section V formed by integrally forming a circular truncated cone-shaped lip portion (6a) at one end of the ring body. The mold is made of an elastic material, and the lip portion (6a) is elastically in close contact with the outer peripheral surface of the cylindrical body (1) on the inner peripheral side, and the surface opposite to the cylindrical body (1) is Mounted in the annular groove (5a) of the dust seal ring (5) so as to contact the groove surface of the annular groove (5a), and in the vertical direction between the annular groove (5a) by the mounting The dust seal structure including a seal ring (6) that generates play allows the dust seal ring (5) to follow the minute vertical movement of the spindle assembly head (11), thereby the dust seal ring (5). And the lower surface of the engagement groove (2) are kept in contact with each other, the communication between the crushing chamber (15) and the lubricating oil circulation part (20-22) is blocked, and dust from the crushing chamber (15) Prevents the oil from entering the lubricating oil circulation section (20-22) Reluctant, operating method of the gyrating-type crusher and performing crushing the crushed material.

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