JPH04180846A - Roll press - Google Patents

Abstract

PURPOSE:To facilitate the replacement of a liner by constituting each of both rolls of annular liners each of which has the central part whose inner diameter is smaller than that of each of both shaft end parts and a pair of the left and right bosses fitted to the liners and having a truncated cone shape whose central part has an outer diameter smaller than that of each of the shaft end parts. CONSTITUTION:The raw material to be ground freely falling from the discharge port of a hopper is supplied to a pair of rolls 3, 4 rotating around horizontal shafts. A pair of left and right bearings 3a supporting the rotary shaft of one roll are fixed and a pair of left and right bearings 4a supporting the rotary shaft of the other roll are arranged in a slidable manner in the direction right-angled to the shaft, and hydraulic cylinders 5 are connected to compress and grind the aforementioned raw material to be ground between the peripheral surfaces close to each other of the rolls 3, 4. Each of the rolls 3, 4 is constituted of annular liners 3B each of which has a central part whose inner diameter is smaller than that of each of both shaft end parts and a pair of left and right bosses 3A fitted to the liners 3B and having a truncated cone shape whose central part has an outer diameter smaller than that of each of the shaft end parts. As a result, the mounting or detaching work of the bosses and the liners can be easily performed.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a roll press for pulverizing blast furnace slag, cement clinker, limestone, cement raw materials, and various chemicals, and in particular improves the workability of attaching and detaching the boss of the roll and the liner. This is about a roll press that has been improved.

[Prior Art] A pair of cylindrical rolls that rotate in opposite directions around a horizontal axis of rotation are used for pulverizing blast furnace slag, cement clinker, and other pulverized raw materials, or for preliminary pulverization when obtaining powder as a final product. Roll presses are widely used.

In this roll press, the pulverized raw material is placed directly below the hopper that stores the pulverized raw material, and the pulverized raw material that fills the hopper discharge port and falls is supplied directly above the center between the two rolls, and is lowered at the boundary between the two rolls. The circumferential gap between the two rolls (hereinafter referred to as the roll roll The particle size of the product is determined by the properties of the pulverized raw material (ability to be pulverized), the raw material particle size distribution, and the pressing force between the two rolls. It is regulated by factors such as the gap and the amount of raw material supplied (weight of crab/time).

By the way, as shown in FIG. 4, a roll of a conventional roll press is usually made by fitting a liner 3B having the same inner diameter to a boss 3A having the same outer diameter, and then tightening it by applying presser plates 3C to both left and right ends. It is often fixed with a 3D bolt.

L Problems to be Solved by the Invention] However, in a roll consisting of a boss and a liner having such a structure, precise machining is required to tightly fit the outer diameter of the boss and the inner diameter of the liner. Moreover, since a minute interference must be provided between the boss and the liner to integrate the boss and the liner, a great deal of labor is required in manufacturing and assembling.

In addition, since the raw material, which is a hard material to be crushed, is held between both rolls and subjected to strong pressure, the outer circumferential surface of the liner is worn out, and it becomes impossible to obtain a roll gap in the axial direction, so that the particle size of the product after crushing is reduced to the desired particle size. It would be out of range. As a countermeasure for this, repair work is carried out by applying wear-resistant build-up welding to the liner surface, especially in areas where there is a lot of wear, but in order to remove the liner in use from the boss,
Stopping operation requires a lot of time and effort. Furthermore, even if the liner is repaired as a single unit without being separated from the boss, there is a problem in that the downtime of the roll press for repair can last several hours, resulting in a decrease in production efficiency.

For this reason, when it is time to repair liner wear, the liner is quickly removed from the boss and replaced with a spare new or repaired liner to minimize downtime and reduce production efficiency due to repairs. A roll press was requested.

[Means for Solving the Problems] In order to solve the above-mentioned problems and to minimize the downtime by attaching and detaching the liner from the boss in a short time, the present invention provides the following methods: It is equipped with a pair of rolls that rotate around a horizontal axis, a pair of left and right bearings that support the rotation axis of one roll are fixedly installed, and a pair of left and right bearings that support the rotation axis of the other roll are installed in a direction perpendicular to the axis. In a roll press for compressing and pulverizing the pulverized raw material on the adjacent peripheral surfaces of both rolls by connecting hydraulic cylinders that are arranged so as to be slidable, the inner diameter of the center portion of the two rolls is the same as the inner diameter of the end portions of both shafts. It has a structure consisting of an annular liner with a relatively small diameter and a pair of left and right bosses that are fitted into the liner and have a truncated conical shape with the outer diameter of the shaft end larger than the outer diameter of the center part. It was made into a roll press.

[Function] The roll press of the present invention has a liner having an equal outer diameter and a smaller inner diameter at the center, and a boss fitted to the liner has a pair of left and right truncated conical bosses. Each end is charged as a single unit, and when the liner surface wear progresses and it is time for liner repair, the boss can be removed from both sides of the liner in a short time. Liner replacement work can be easily completed.

[Example] Hereinafter, an example of the present invention will be described in detail based on the drawings.

1 to 3 show embodiments of the present invention, FIG. 1 is a plan view of a roll press, FIG. 2 is a longitudinal sectional view of a roll, and FIG. 3 is a longitudinal sectional view of a roll showing another embodiment. 4 are longitudinal sectional views of a roll showing a conventional example.

In the figure, 1 is a roll press, 2 is a casing, 2a
is a raw material input port, 3 is a fixed roll, 3a is a bearing, 3b is a speed reducer, 3c is an electric motor, 4 is a movable roll, 4a is a bearing, 4bii speed reducer, 4c is an electric motor, 5 is a hydraulic cylinder,
20 is a coupling.

The fixed roll 3 and the movable roll 4 have the same structure, and for example, taking the roll 3 as a representative, as shown in FIG. 2, the boss 3 is made of forged steel such as 5F55.
Consisting of liner A, 3A and liner 3B outside it, liner 3
B has a smaller inner diameter at the center than at both ends, and the wall thickness changes in a tapered shape, becoming thicker at the center. On the other hand, the boss has a large diameter at the shaft end and a small diameter at the center, and has a tapered truncated conical shape similar to the liner 3B. Each part has a concave and convex fitting part and is integrated into one body. Boss 3 from the left and right shaft ends on liner 3B
After inserting A and 3A and matching the concave and convex fitting parts at the tips,
By fastening the tightening bolt 3D via the holding plates 3C, 3C, the bosses 3A, 3A and the liner 3B are integrated. The whole is formed into a cylindrical shape.

FIG. 3 shows another embodiment of the roll in the roll press of the present invention, which differs from the embodiment in FIG. 2 in that there is a horizontal cylindrical portion in the center of the liner 3B and bosses 3A, 3A. is the same as in Figure 2. In this case, compared to the embodiment shown in FIG. 2, there is an advantage that the axis of the bearings 3a at both ends can be easily exposed, but it becomes somewhat difficult to attach and detach the boss and the liner.

The fixed roll 3 and the movable roll 4 configured as described above both have a pair of bearings 3a, 3a, and 4a that support a rotating shaft that rotates around a horizontal axis.

4a are arranged in parallel in the casing 2, and are driven via an electric motor 3c, a V-belt, and a speed reducer 3b, and an electric motor 4c, a V-belt, and a speed reducer 4b, respectively. Two upper and lower hydraulic cylinders 5L, 5L are connected to the bearing 4a of the movable roll 4 on the left side when viewed from the movable side, and the other end is fixed to the frame 2c of the casing 2. Similarly, on the right side, two upper and lower hydraulic cylinders 5R, 5R are connected to the bearing 4a on the right side, and the other end is fixed to the frame 2C of the casing 2. The bearings 4a of the movable roll 4 are configured such that their bottom plates can slide on the frame 2d of the casing 2.

The rolls 3.4 have approximately the same diameter and width, are driven to rotate in opposite directions, and are set to rotate downwardly on adjacent peripheral surfaces so that the caught raw material moves downwardly. The movable roll 4 has bearings 4a, 4a arranged so as to be slidable in the direction perpendicular to the axis, and two hydraulic cylinders 5L, 5 on the left and right sides.
The forward and backward movements of the piston rods L, 5R, and 5R apply a pressing force to the biting material, and the roll gap δ between the two rolls can be adjusted.

In addition, both rolls are operated by hydraulic cylinders 5L, 5L and 5R,
A mechanical stopper is provided to prevent damage to the roll circumferential surface even if the roll is approached by a pressing force of 5R, that is, to prevent metal contact, and is configured to maintain a clearance of, for example, at least 7 mm. Since this minimum clearance increases due to wear of the circumferential surface during use, a separate adjustment device is provided that can adjust this clearance.

As explained above, the roll press 1 has both rolls 3 and 4.
The raw material is compressed and pulverized using a pulverizer, but the roll surface wears out over several months or years due to continuous use, making it impossible to continue normal operation to obtain the desired particle size distribution. There is a need to repair or replace with a new one.

In this case, in the rolls 3 and 4 of the roll press of the present invention, the truncated conical bosses 3A, 3A are fitted from the left and right to the single liner 3B along the tapered portion of the inner diameter of the liner 3B. boss 3A in the axial direction along this taber.
, 3A easily from the liner 3B to the boss 3A.

3A can be removed.

Therefore, after removing the bosses 3A and 3A from the liner 3B, immediately attach a new spare liner or a repaired liner that has been restored to the state before use by applying wear-resistant weld overlay to the worn parts to the boss, and then start operation. can be restarted. Also,
Even if the repair liner is thermally deformed due to local heating during repair, the liner of the present invention having a tapered inner diameter is attached to the tapered part of the boss, so attachment is easy and the work can be completed in a short time.

[Effects of the Invention] As explained above, in the roll press of the present invention, attachment and detachment of the roll boss and liner are easy and can be done in a short time, so the downtime of the roll press is reduced.
There is little decrease in production efficiency due to liner replacement or repair.
Moreover, it has excellent maintainability.

[Brief explanation of drawings]

1 to 3 show embodiments of the present invention, FIG. 1 is a plan view of a roll press, FIG. 2 is a longitudinal sectional view of a roll, and FIG. 3 is a longitudinal sectional view of a roll showing another embodiment. 4 are longitudinal sectional views of a roll showing a conventional embodiment. l...Roll press, 2...Casing, 3...Fixed side roll, 3a...Bearing, 3b...Reducer, 3C...Electric motor, 3A
...Boss, 3B...Raina, 3C...
・Holding plate, 3D...Tightening bolt, 4...
...Movable side roll, 4a...Bearing, 4b...Reducer, 4C...Electric motor, 4d...Rod,
20...Coupling. Patent applicant: Ube Industries, Ltd. Figure 1 Figure 2 Figure 3A JA Figure 4

Claims (1)

[Scope of Claims] A pair of rolls are supplied with pulverized raw material that falls freely from a hopper discharge port and rotate around a horizontal axis. A roll press for compressing and pulverizing the pulverized raw material on the adjacent peripheral surfaces of both rolls, wherein a pair of left and right bearings supporting a roll rotation shaft are arranged so as to be slidable in a direction perpendicular to the axis, and a hydraulic cylinder is connected to the roll press. The roll includes an annular liner whose inner diameter at the center is smaller than the inner diameter at both ends of the shaft, and a conical liner fitted into the liner and whose outer diameter at the shaft ends is larger than the outer diameter at the center. A roll press characterized by being comprised of a pair of left and right trapezoidal bosses.