JPS591703Y2 - Protection device for swing transmission system in cone crusher - Google Patents

Description

[Detailed description of the invention] This invention protects the bearings and other rotation transmission systems of cone crushers from the dust that accompanies crushing, and the structure of the dust seal completely and smoothly absorbs the rotation. This invention relates to a protection device for a rotational transmission system which is devised to obtain a perfect sealing effect and which can be provided with excellent durability based on the simplest structure.

As is well known, a cone crusher for crushing rocks and ores has a conical cone cape 2 fitted in the upper part of a side fixed frame 1, as shown in FIG. By rotating the mantle 3 in the created space, compression and crushing are performed between them.

In this case, there is a problem in that a large amount of dust generated due to the crushing enters the bearing section formed below the mantle, so countermeasures have been taken in the past.

For example, if we look at the main shaft rotation type crusher shown in Fig. 1, the seal structure in this case is such that a deep groove-shaped recess 5 is provided around the bottom of the Herad sensor 4 for externally fitting the mantle 3, and the mantle 3 is fixed. A cylindrical fixed side seal 6 is installed upright from the inside of the frame 1, and a seal ring 7 is interposed between the outer periphery of this seal 6 and the bottom inner periphery of the head center 4. It is something.

In this crusher, a cylindrical eccentric 10 that rotates integrally is installed upright on a driven gear 9 that is rotated around a vertical axis by a drive pinion 8. The rotating body 14 is pivoted according to the eccentric movement of the eccentric 10 by being supported by the fixed frame 1 and by supporting the lower portion of the crusher main shaft 13 through an inner bearing 12 in an eccentric hole formed on the inner periphery. .

This rotation is called gyratory motion, and the main shaft 13
That is, the rotating body 14 is given a combination of vertical motion, rotation, and eccentric motion.

In such a device, the seal ring 7 absorbs the compound movement by sliding on the rotating body 14 on a spherical surface and maintains close contact with its inner periphery always fitting the outer surface of the stationary side seal 6. In actual operation with a similar structure, the seal ring 7 itself constantly rubs against the spherical groove 15 of the rotating body 14, resulting in considerable abrasion of both sides, and this, combined with the impact crushing vibration, causes this. The parts will wear out quickly, and the dust from the crushing process will enter through the resulting gaps.

Furthermore, the inner periphery of the seal ring 7 only needs to be completely fixed to the stationary side seal 6, but in this type of crusher, the outlet gap 16 is controlled to obtain food products, or for product use or to prevent wear of the mantle or cone cape. Since it is essential to raise and lower the main shaft 13 using the hydraulic lifting device 17 in order to meet the
In such a case, it is preferable to form the seal ring 7 in complete contact with the stationary side seal 6 without any gaps.

However, in reality, if the gap is too small, wear will progress prematurely due to fine dust intervening here. Especially, if the curvature of the seal ring 7 matches the center of rotation P at the upper end as designed, the fixed side Although the sliding friction between the seal ring 6 and the seal ring 6 is small, in reality, friction occurs as it moves up and down depending on various situations, so it is difficult to avoid the progress of wear. Using a seal would not have sufficient durability, so a hard resin was selected with lubrication in mind, but even with this, wear was unavoidable due to the above-mentioned structural reasons.

If a gap is created in this way at an early stage, dust can easily enter.In particular, since the seal ring 7 itself temporarily moves along with the eccentric movement caused by the rotation, for example, when the rotating body 14 moves away in the outer radial direction, the dust easily enters. Since the seal ring 7 also tends to follow suit, a floating gap is created between the seal ring 7 and the fixed side seal 6, making it easier for dust to enter.

At this time, the air in the recessed part 5 acts to suck in dust because the space near the outer periphery of the stationary side seal 6 expands, and the subsequent movement of the rotating body 14 in the inner radial direction further sucks the invading dust into the bearing 11. , 12 side, and on the other hand, since the sealed internal space exhibits a contraction effect after operation, external dust further intrudes due to the suction force, causing early damage to bearings and other related parts due to dust. Not only does this cause damage to the durability of the crusher drive system, but a large amount of this dust gets mixed into the oil that constantly lubricates the drive system and contaminates it, making it necessary to change the oil at an early stage.

Moreover, from a structural point of view, it is quite complex as described above, and in particular, since it is attached with the other fixed side seal 6 of the seal ring 7, it is very disadvantageous in terms of cost and maintenance. there were.

This idea was devised to effectively solve these problems, and its purpose is to protect the internal bearings by installing elastically expandable protective tubes in areas where there is a risk of dust intrusion. We have developed a protection device for the rotational transmission system in a cone crusher that has an extremely simple structure and completely seals the system, thereby improving the durability of the crusher drive system and making oil changes longer. The main purpose of this service is to provide the following:
Between the bottom of the fluid and the mounting part of the fixed frame that corresponds to the bottom of the fluid from below, there is an elastic expansion type protection that disconnects the lower bearing part of the rotating body from the inside and outside of the crushed stone discharge zone and absorbs rotational movement. a cylinder is disposed, the upper end of the protective part is fixed to the bottom of the fluid, the mounting part is provided with a bearing in which an outer ring rotates around a vertical axis, the lower end of the protector is fixed to the outer ring, and the outer circumferential surface of the bearing is fixed. in that it is provided with a seal covering the side to the crushed stone discharge zone.

This invention will be explained below with reference to an illustrated example.

FIG. 2 is an example of a drive type similar to that in FIG. 1.

The upper body 1 is a cylindrical fixed frame having an upper bearing 18 at the center of the top, and a charging hopper 19 is fitted to the top of the frame, and a conical cone cape 2 is fitted to the lower part of the frame.

A fixed cylinder 22 whose center is vertically oriented is integrally formed in the center of the interior of the lower body 21, and a drive pinion 8 is installed inside the fixed cylinder 22.
An eccentric 10 having a driven gear 9 at its lower end that is rotated about a vertical axis is supported.

This eccentric 10 includes an outer bearing 11 between the outer periphery aligned with the crusher center O and the inner and outer sides of the fixed cylinder 22,
An inner bearing 12 is interposed between the inner peripheral hole aligned with the main shaft center O' and the main shaft 13, and the crusher main shaft 14 moves eccentrically with respect to the crusher center O by these lower bearings 11,12.

23 is a thrust metal that receives the bottom of the lower end of the main shaft 13 with a spherical surface, and the metal 23 and the hydraulic lifting device 17
The main shaft 13 can be moved up and down via the.

Reference numeral 14 denotes a rotating body constructed by fitting the head center 4 on the middle outer periphery of the main shaft 13 and fitting the mantle 3 on the outer periphery. Rotates about center P.

In this specific example, as shown in detail in FIG. 3, an inverted saucer-shaped recess 24 is formed at the bottom of the rotating body 14, and an upper retaining ring 26 is attached to the bottom wall 25 of the recess 24 as a main shaft. 13
While protruding downward and fixed in a concentric position around the outer periphery,
The outer periphery of the top of the fixed cylinder 22 is used as a mounting part, and an idling type bearing 27 in which an outer ring rotates around a vertical axis is fitted into the mounting part, and the outer ring of the bearing 27 is fitted into the outer periphery of the bearing 27. A lower retaining ring 29 is removably provided along the retaining ring 28.

In this way, a protective cylinder 30 formed of a rubber bellows is stretched between the upper and lower retaining rings 26 and 29 with its center facing upward and downward, and the vertical movement and rotation caused by the rotation of this protective cylinder 30・Constructed to absorb eccentric motion in a complex manner.

As shown in FIG. 3, in order to seal between the inner and outer rings due to the structure of the free-rotating type bearing 27, the outer peripheral surface of the bearing 27 is crushed and discharged between the entire lower end fixed cylinder 22 of the holding ring 28. A labyrinth-type auxiliary seal 31 is configured to cover the zone 32. In this case, sealing without resistance can be achieved by sealing in grease, water, oil, or other blocking agent at location a of the seal 31. can be obtained effectively.

Therefore, since the protective cylinder 30 is configured as described above, the rotating body 14
The entire area around the lower bearings 11 and 12 is completely disconnected from the discharge zone 32, and wear occurs due to the complex elastic expansion and contraction and rotation of the bearing 27, especially when the rotating body 14 moves in multiple directions. A perfect dust seal is possible without any dust sealing, and even if expansion and compression occur inside the protective cylinder 30, it is completely absorbed by the free deformation of the protective cylinder 30 itself, and as a result, dust is removed from the outside. It does not cause the inconvenience of inhaling.

Furthermore, even if the main shaft 13 is adjusted up and down by the hydraulic lifting device 17, this is absorbed by the expansion and contraction action of the protective tube 30 itself, and a perfect sealing condition can always be ensured.

Furthermore, a recessed portion 5 and a fixed side seal 6 as shown in FIG.
etc. can be omitted as much as possible as shown in Figure 2,
Accordingly, the rotating body 14 itself can be made even stronger and heavier, so the compressive crushing action is very strong and stable, and the structure is simple and advantageous in manufacturing.

Furthermore, since such a perfect seal is obtained, there is no contamination of the internal lubricating oil, making it possible to extend the oil change interval considerably, and therefore bearing wear and tear to a very small degree.

Furthermore, the rotating body 14 may rotate synchronously due to bearing friction during no-load operation, but this can be prevented by the resistance moment of the protective cylinder 30 and the bearing 27, so that the lower bearing is prevented from rotating due to the reverse rotation that is likely to occur when loading materials. System damage is avoided.

This invention is as described above, and therefore, it is possible to sufficiently achieve the intended purpose and provide a protective device that is inexpensive and has excellent maintainability.

In particular, in the present invention, the mounting portion corresponding to the bottom of the fluid in the fixed frame from below is provided with a bearing for rotating the outer ring around the vertical axis, and the lower end of the protection is fixed to the outer ring.
Even if the rotating body rotates on its own axis due to eccentric rotation when no load is applied, or in the opposite direction to the above-mentioned rotational direction due to interaction with crushing rocks when loaded, the protective cylinder and the outer ring of the bearing will rotate together with the rotating body. The protection tube suitably follows the rotation of the rotating body, and the rotation follow-up mechanism of the protection tube is constituted by a simple bearing, and the mechanism is simple and inexpensive.

Further, since the bearing is provided with a seal that covers the outer circumferential surface of the bearing with respect to the crushed stone discharge zone, the bearing can be protected from dust caused by crushing by the seal, and the life of the bearing can be extended.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a crusher showing a conventional example, FIG. 2 is a vertical cross-sectional view of a crusher showing an example of this invention, and FIG. 3 is a cross-sectional view showing an enlarged seal structure thereof. 1...Fixed frame, 10...Eccentric, 11.12...Lower bearing, 14.
... Rotating body, 17 ... Lifting device, 30.
...Protective tube, 32...Ejection zone.

Claims (1)

[Scope of claim for utility model registration] A crusher fixing frame having a cone cape on the inner periphery of the upper part and an eccentric with an eccentric rotation part on the lower part;
A cone crusher comprising: a rotating body that rotates within a cone cape to receive eccentric rotation; a lifting device that allows the rotating body to be raised and lowered by hydraulic pressure or the like with respect to the cone cape side; An elastically expandable protective cylinder is arranged between the bottom of the rotating body in the fixed frame and the mounting part corresponding to it from below, which disconnects the lower bearing part of the rotating body from the inside and outside of the crushed stone discharge zone and absorbs rotational movement. , the upper end of the protection part is fixed to the bottom of the rotating body, the mounting part is provided with a bearing whose outer ring rotates around a vertical axis, the lower end of the protection is fixed to the outer ring, and the outer peripheral surface of the bearing is arranged in a crushed stone discharge zone. A protection device for a rotational transmission system in a cone crusher, characterized by comprising a seal covering the cone crusher.