JPS63270556A - Roll crusher - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a roll crusher for crushing rocks, ores, etc.

As shown in FIGS. 7 and 8, a conventional roll crusher has a pair of rolls 2.3 facing each other and rotating in opposite directions, and a space formed between the pair of rolls. A type of crushing material such as rocks and ores is supplied into the crushing chamber 6 through the supply port 5, and the supplied material is compressed and crushed while being rolled up by the pair of rolls 2.3. be.

In this type of roll crusher, as shown in FIGS. 9a and 9b, the longitudinal side surfaces 6a+6b of the crushing chamber (area indicated by chain lines) 6 are defined by the outer circumferential surfaces of the pair of rolls 2.3, while the end surfaces thereof 6c and 6d coincide with the openings formed between the respective opposite end surfaces 2a, 2b and 3a, 3b of the pair of rolls 2.3. However, the illustrated crushing chamber 6 is a diagram for convenience of explanation, and does not always correspond to the illustrated area, but changes to an appropriate spatial area depending on the crushing conditions.

By the way, in the conventional roll crusher, the crushing chamber 6
The end faces 6 ce 6 d of were left open as an opening. Therefore, among the materials to be crushed supplied into the crushing chamber 6, those supplied near the end openings 6c+'6d are crushed during the crushing operation by the rolls 2.3.
c and 6d to the outside of the crushing chamber 4, resulting in a phenomenon in which the pressure applied to both rolls 2.3 is high at the center of the rolls and low at both ends.

If the crushing operation is repeated in this state, both rolls 2 and 3 will wear unevenly, resulting in an unevenly worn shape with a small diameter in the center and large diameters at both ends, as shown in Figure 10. There was a risk. When such uneven wear occurs, it becomes impossible to maintain the set or roll gap uniformly in the axial direction, making it extremely difficult to meet the demands of crushing objects with relatively small sets, such as in the production of crushed sand. become.

In addition, by making the set between the rolls relatively large and interposing a film number of particles to be crushed between the rolls, the particles to be crushed can interfere with each other (compress), thereby increasing the crushing effect. The present applicant has already proposed a crushing method that utilizes the so-called interference crushing effect to further increase the crushing effect (Japanese Patent Application No. 8140/1982). In this crushing method, the gap between rolls 2 and 3 (crushing gap) is set relatively wide, 0.6 to 1.8 times the particle size through which 80% of the crushed material passes, and The amount of material to be crushed is adjusted so that the amount of material passing through the crushing chamber 6 is in the range of 0.5 to 0.8 times the theoretical passing capacity of the crusher (passing amount of about 173 of roll width x roll circumferential speed x roll gap). Supply is limited. According to this method, the particles of the material to be crushed are mutually compressed in the crushing chamber 6, and the crushing processing capacity for fine-grained products is improved compared to the case where crushing is simply performed by direct compression from the rolls 2.3. This has been dramatically improved, and the shape of the crushed product particles can be made into a good shape (cubic shape with rounded corners). In this crushing method, as described above, if the roll pressure fluctuates between the center and both ends of the roll, the interference compressive force between the objects to be crushed will correspondingly decrease at both ends of the crushing chamber 6. Put it away. In addition, in a crushing method that utilizes this interference crushing effect,
Since the pressure for compressing the material to be crushed in the crushing chamber is particularly high, the amount of material to be crushed is likely to be pushed out from the ends of the crushing chamber, and therefore the degree of decrease in compression force at both ends is also large. As a result, there was a fear that the initial objective of improving the crushing effect could not be sufficiently achieved.

Problems to be Solved by the Present Invention In view of the above points, the present invention has been developed in the longitudinal direction (
11! To make the pressure distribution uniform in the axial direction of the rolls and to prevent uneven wear of the rolls and non-uniform compressive force between the particles of the crushed material in a crushing method that utilizes the interference crushing effect. :, as a problem to be solved.

A means for solving the above problems, that is, the present invention has a pair of rolls facing each other, and supplies the material to be crushed into a crushing chamber which is a space formed between these rows. , a roll crusher that crushes the supplied material to be crushed while being rolled up by the pair of rolls rotating in opposite directions, which covers the openings of the crushing chamber formed at both end faces of the pair of rolls, and includes a crusher in the crushing chamber. This roll crusher is characterized in that it is provided with a restraining member that prevents the supplied material to be crushed from being pushed out of the crushing chamber by closing the entire opening of the crushing chamber.

By providing the suppressing member, the objects to be crushed near the openings at both ends of the crushing chamber will not be pushed out through the openings, and therefore the roll pressure will not decrease at both ends of the roll. As a result, uneven wear of the rolls does not occur, and uniform crushing can be carried out over a long period of time. It is particularly effective for crushing into crushed sand.

In addition, in the above-mentioned interference crushing in which the set is relatively wide, the compressive force acting between the particles of the material to be crushed in the crushing chamber is uniform over the entire lengthwise direction (roll axis direction). The crushing fIJ can be reliably compressed and crushed in the entire range, and the crushing effect is improved.

Embodiment FIGS. 1 and 2 show one embodiment. In these figures, the same members as those in the conventional device shown in FIG. 7 are designated by the same reference numerals. The difference between this embodiment and the conventional roll crusher is that the crushing chamber 6 has openings 6c and 6d (
9b)) is provided with a restraining member 4i.

These restraining members 4 are attached to both ends 2a*2b of the rolls 2 and 3.
and 3a * 3b (Fig. 9a), and in some cases come into contact (sliding contact) with the rollers 2.3 and 3a * 3b (Fig. 9a), and while the material to be crushed is being crushed by the rolls 2.3, the The objects to be crushed are placed in the openings 6c and 6d at both ends of the crushing chamber 6 (No. 9b).
(Figure) to prevent leakage to the outside. As a result, the pressure applied to both ends of the rolls 2 and 3 does not decrease,
In addition, in the case of interference crushing in which the set '1 between the rolls 2 and 3 is relatively wide, the compression force between the particles of the crushed material does not decrease at both ends of the crushing chamber 6.

Note that a fixed gate 7 and a slide gate 8 are provided at the supply port 5 for the material to be crushed. A rod 9 is connected to the slide gate 8 as shown in FIG. 3, and by moving this rod 9 in the direction of arrows A to A', the space between the fixed gate 7 and the slide gate 8 is expanded. You can adjust the spacing. Thereby, the amount of material to be crushed sent from the supply port 5 to the crushing chamber 6 can be adjusted. The tip of the slide gate 8 is curved, and the cross-sectional shape of the supply port 5 is wide at both end regions of the crushing chamber 6 and narrow at the center region, which is due to the side wall of the supply port 5 (i.e., the crushing This is to supply the material to be crushed sufficiently to both ends of the chamber 6 and uniformly supply the material to be crushed over the entire longitudinal direction of one crushing chamber 6.

Further, the length of the supply port 5 in the longitudinal direction is approximately equal to the inner dimension of both restraining members 4, that is, slightly smaller than the axial length L' of the roll 2.3, as shown in FIG. It has a long length. This, in combination with the curved tip of the slide gate 8 as described above, makes it possible for the roll 2
．． This is to uniformly supply the material to be crushed over the entire length of 3. Reference numeral Bg in FIG. 2 is a bearing for supporting the roll 2.3.

FIGS. 5 and 6 show other embodiments.

In this embodiment, the restraining member 14 consists of a fixed part 1 fixed to the frame l and a flange part 12 fixed to the shaft of one of the rolls 3 and rotating together with the roll 3. 14 are both ends 6c, 6 of the crushing chamber 6
Preventing the material to be crushed from flowing out from d is the same as in the embodiment shown in FIGS. 1 and 2. Particularly in this embodiment, since the flange portion 12 as a holding member rotates in accordance with the rotation of the rolls 2.3, the relative displacement between the flange portion and the object to be crushed is small, and therefore the flange portion 12, that is, the holding member 14 has less wear.

Effects of the Invention As described above, according to the present invention, the flow of the material to be crushed from the crushing chamber is prevented by the suppressing member, so that the pressure applied to the rolls and the compressive force acting between the particles of the material to be crushed in the crushing chamber are reduced. becomes uniform over the entire lengthwise direction (roll axis direction), and as a result, improvement of the crushing effect and prevention of uneven wear of the rolls are achieved.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view of one embodiment, Fig. 2 is a plan sectional view of the embodiment, Fig. 3 is a top view of the embodiment, and Fig. 4 is taken along the IT-■ line in Fig. 1. 5 is a side sectional view of another embodiment, FIG. 6 is a plan sectional view of the embodiment, FIGS. 7 and 8 are sectional views of a conventional roll crusher, and FIGS. 9a and 9b. The figure is a perspective view showing the crushing chamber, and FIG. 10 is a schematic diagram showing the wear state of the rolls. 2.3... Roll, 6... Crushing chamber, 2 a, 2
b, 3a, 3b-roll end face, 6ce6
d...Crushing chamber opening, 4.14...Suppressing member Hi Hi procedure amendment (voluntary) February 24, 1988

Claims (5)

[Claims] (1) It has a pair of rolls facing each other, supplies the material to be crushed into a crushing chamber which is a space formed between these rolls, and compresses and crushes the material while being rolled up by the pair of rolls. In the roll crusher, a suppressing member that covers the crushing chamber opening formed between the end faces of the respective rolls and prevents the crushed material supplied into the crushing chamber from being pushed out of the crushing chamber through the crushing chamber opening. A roll crusher characterized by being equipped with. (2) Claim 1, wherein the holding member is attached to at least one of the rolls and rotates together with the roll, and has a flange having a diameter larger than that of the roll. Roll crusher described in. (3) It has a crushed material supply port for supplying the crushed material, and the length of the crushed material supply port in the roll axis direction is approximately equal to the internal dimension between the respective restraining members. A roll crusher according to claim 1 or 2. (4) Claims characterized in that at least a part of the supply path for supplying the material to be crushed is wide in regions corresponding to both ends of the crushing chamber and narrow in a region corresponding to the center part. The roll crusher according to any one of Items 1 to 3. (5) Any one of claims 1 to 4, characterized in that the size of the opening area of at least a portion of the supply path for supplying the material to be crushed is adjustable. Roll crusher described in.