JPS6241785B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention aims at grinding primary crushed materials that have been subjected to normal crushing action by a geo crusher, cone crusher, etc. using a crushing member such as an oscillating crushing plate. This invention relates to an improvement in a grinding material particle shape adjusting device for producing ground material having a particle shape close to the natural particle shape of construction aggregate, etc. by applying a crushing action to adjust the particle size and particle shape.

(Prior art and its problems) Conventional compression type crushers such as geo-crushers and cone crushers have a pair of opposing crushing members, and by swinging one or both of the crushing members, the crushing between the crushing members is achieved. By periodically expanding and contracting the gap, the material to be crushed, which is introduced into the crushing gap from above, is compressed and crushed to a size smaller than the exit gap, and the produced crushed material particles are quickly released from the outlet gap below by gravity. configured to be ejected.

For this reason, the filling rate of the material to be crushed into the crushing gap is basically low, and the state in which the material to be crushed is inserted into the crushing gap is in a single-layer formation filling and feeding state. Grinding actions such as abrasion, compression, and crushing virtually never occur, and as a result, many of the particles are flat or oblong along the crushing gaps.
In addition, there was a drawback that the raw material was roughly crushed, and irregularly shaped crushed products having many sharp points due to secondary crushing were produced.

Therefore, when this kind of produced crushed material is used, for example, as concrete aggregate, due to the influence of its particle shape, the amount of water and cement must be increased to produce concrete that has the same strength as concrete using natural aggregate. This type of crushed material is not used as it is as a final product such as construction aggregate, as it may be necessary to increase the amount of water or water may rise to the surface during curing, causing various problems. Can not do it.

The grinding material particle shape adjusting device described in Japanese Patent Publication No. 58-26975 filed by the present applicant, which was developed to deal with such problems, has a pair of grinding members facing each other, and the grinding By swinging one or both of the members, the grinding gap between the grinding members is intermittently expanded and contracted, and a member called an adjustment face piece is provided at an angle at a position that closes the outlet of the grinding gap. A ground material discharge gap is formed extending laterally and connected to the outlet of the grinding gap.

FIG. 2 shows the structure of the main part of an example of the grinding material particle shape adjusting device. In the figure, reference numerals 1 and 2 are a pair of grinding members facing each other, and the space between the grinding members 1 and 2 is a grinding gap B. In this example, the grinding member 1 is fixed, and the grinding member 2 swings as shown by the arrow, so that the grinding gap B is periodically expanded and contracted. Reference numeral 3 denotes an adjustment face piece provided at an angle to close the outlet C of the grinding gap B, and a ground material discharge gap D is formed extending laterally and connected to the outlet C by the adjustment face piece 3. . In this example, the inclination angle θ of the adjustment face piece 3 is variable.

In the grinding material particle shape adjusting device configured as described above, when the primary crushed material, which has been crushed by a geo-crusher or the like, is fed from the upper inlet A, the grinding gap B
The ground material passes through the outlet C and is discharged from the discharge gap D via the adjustment face 3. In this process, since the adjustment face piece 3 is in a position to block the outlet C, the ground material is not discharged immediately, but accumulates there, and this accumulation extends into the grinding gap B.
The grinding gap B will be filled with ground material. When the grinding gap B is expanded or contracted with the ground material filled, the weak points of the ground material are crushed due to the grinding action of mutual abrasion, compression, crushing, etc., resulting in flat, oblong particles, and acute angles. The cusps are preferentially ground, and the grain shape is adjusted. Discharge of the ground material is performed intermittently through a lateral discharge gap D connected to the outlet C.

In this way, the grinding material particle shape adjusting device has the adjusting surface body 3.
The particle shape is adjusted by accumulating and filling the grinding gap B by the action of By adjusting the grinding gap B
The outlet C can be brought into an optimal closed state, thereby making it possible to perform the most preferable particle shape adjustment. Furthermore, since the above-mentioned grinding is mainly performed between particles, there is extremely little wear and tear on the grinding members, and maintenance costs are low.

However, in this grinding material particle shape adjustment device,
When attempting to process primary crushed material containing a large amount of water and mud, mud and fine particles generated by the grinding adhere to the grinding surfaces of the grinding members 1 and 2, and the outlet C of the grinding gap B. There was a problem in that the amount of ground material passing through the grinding material was extremely small, and the amount of grinding processed per unit time was significantly reduced.

(Purpose of the Invention) The present invention has been made to solve the above problem, and when processing primary crushed material containing a large amount of water and mud, it is possible to avoid mud and polishing on the grinding surface of the grinding member. It is an object of the present invention to provide a grinding material particle shape adjusting device that can prevent fine particles generated by crushing from adhering to each other and can maintain a constant amount of ground material passing through the outlet of a grinding gap.

(Structure of the Invention) The grinding material particle shape adjusting device of the present invention is based on the above-mentioned
The basic configuration is the grinding material particle shape adjusting device described in Publication No. 58-26975, that is, by providing a displaceable adjusting face at the outlet of the grinding gap formed by a pair of opposing grinding members, As before, the discharge of the ground material is delayed and accumulated, the grinding gap is filled with the material to be ground, and the particle shape is adjusted by the grinding action of mutual abrasion, compression, crushing, etc. of the particles. be.

The grinding material particle shape adjusting device of the present invention further includes a sprinkler that sprays water into the grinding gap above the entrance of the grinding gap, a control device is connected to the sprinkler, and the amount of ground material passing through the grinding gap is set at the outlet of the grinding gap. The system is equipped with a detection device that detects water, and operates the control device according to the amount detected by the detection device to spray the required amount of water into the grinding gap. This grinding material can be ground without adhering to the grinding surface of the grinding member, and the amount of material passing through the grinding gap is maintained within a certain range to increase production per unit time. be.

(Example) An example of the grinding material particle shape adjusting device of the present invention will be described in the first example.
This will be explained using figures. Since the same reference numerals in the figure as in FIG. 2 indicate the same parts, the explanation thereof will be omitted. 4 is a motor for swinging the grinding member 2; 5 is a fulcrum of the adjusting face piece 3; the adjusting face piece 3 has a cylinder 6 with one end connected to the fixed grinding member 1 around the fulcrum 5; It is supposed to swing in the vertical direction by the drive of. A sprinkler 7 is installed above the inlet A of the grinding gap B between the pair of grinding members 1 and 2 facing each other.
A control device 8 is connected to the sprinkler 7 to adjust the amount of water sprinkled. A detection device 9 is provided at the outlet C of the grinding gap B to detect the amount of passing ground material, and the control device 8 is operated in accordance with the amount detected by the detection device 9. The sprinkler 7 is configured, for example, by making holes in a pipe at regular intervals so as to spray water uniformly across the width of the grinding gap B. Reference numeral 10 denotes a feeder provided above the grinding gap B for feeding the material to be ground.

In the embodiment configured as described above, the material to be ground, that is, the primary crushed material containing a large amount of water and mud is supplied from the feeder 10 into the grinding gap B from the inlet A, and the fixed grinding member is 1 and the grinding member 2 which is oscillated by the motor 4, and when water is sprinkled into the grinding gap B from the sprinkler 7,
The amount of ground material passing through the outlet C of the grinding gap B by which the primary crushed material can be ground without mud or fine particles generated by grinding adhering to the grinding surfaces of the grinding members 1 and 2. never decreases. Furthermore, the amount of crushed material passing through is detected by the detection device 9 at the outlet C, and the control device 8 is operated according to this detected amount to adjust the amount of water sprinkled from the sprinkler 7.
The amount of ground material passing through the outlet C can be maintained within a certain range.

(Effects of the Invention) As can be seen from the above explanation, the grinding material particle shape adjusting device of the present invention includes a sprinkler that sprinkles water into the grinding gap above the entrance of the grinding gap, a control device connected to the sprinkler, A detection device is provided at the outlet of the grinding gap to detect the amount of passed ground material, and the control device is operated according to the amount detected by this detection device, so that primary crushing containing a large amount of water and mud can be avoided. When grinding an object, by spraying water from a sprinkler, mud and fine particles generated by grinding do not adhere to the grinding surface of the grinding member, so grinding is carried out effectively and the grinding process is improved. The amount of ground material passing through the outlet of the gap does not decrease. Furthermore, since the amount of ground material passing through the outlet of the grinding gap is detected and the amount of water sprinkled by the sprinkler is adjusted accordingly, the amount of ground material passing through the outlet is maintained within a certain range. Therefore, there is an effect that the amount of primary crushed material containing a large amount of water and mud can be crushed per unit time, and the productivity of the crushed material can be increased.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an embodiment of the grinding material particle shape adjusting device of the present invention, and FIG. 2 is a vertical sectional view schematically showing a conventional ground material particle shape adjusting device. 1, 2... Grinding member, 3... Adjustment face piece, 4...
Motor, 5... Fulcrum, 6... Cylinder, 7... Sprinkler, 8... Control device, 9... Grinding material passing amount detection device, 10... Feeder, A... Inlet of grinding gap, B... Grinding gap, C... Outlet of grinding gap, D... Discharge gap for ground material.

Claims (1)

[Claims] 1. At least one of a pair of grinding members facing each other is made swingable to make the grinding gap variable, and the outlet of the grinding gap is opened and closed, and Subsequently, in a ground material particle shape adjusting device comprising a displaceably displaceable adjustment surface that forms a discharge gap on the side, a sprinkler for sprinkling water into the grinding gap is provided above the entrance of the grinding gap, and the sprinkler A control device is connected to the grinding material, a detection device is provided at the outlet of the grinding gap to detect the amount of the ground material passing through, and the control device is operated according to the amount detected by the detection device. Particle shape adjustment device.