JPS6241784B2 - - 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. The present invention relates to an improvement in a grinding material particle shape adjusting device that adjusts the particle size and shape by applying a crushing action to produce ground material having a particle shape close to the natural particle shape of construction aggregate, etc.

(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 body is tilted to a position that closes the outlet of the grinding gap. A grinding material discharge gap is provided to extend laterally and is connected to an outlet of the grinding gap.

FIG. 2 shows the structure of the main part of an example of the crushed 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, thereby periodically expanding and contracting the grinding gap B. 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 optimally closed, thereby obtaining the most favorable particle shape adjustment. Further, 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 order for this grinding material particle shape adjustment device to exhibit the above-mentioned effect, it is an essential condition that the grinding gap B is always filled with the primary grinding material, and the filling state must be kept constant. This is an essential condition for obtaining constant particle shape control. Therefore,
Since the adjustment face piece 3 must be adjusted every time there is a change in conditions, the operating rate is poor and it is extremely difficult to obtain a consistent product. Immediately after the supply of the primary crushed material is started, the grinding gap B is empty, so the primary crushed material easily passes through without being subjected to grinding, which is also a cause of variations in the products.

(Objective of the Invention) The present invention has been made to eliminate such drawbacks, and is capable of performing a grinding action even when the grinding gap is always filled with primary crushed materials, and also enables grinding of a certain range of particle shapes. In addition to making it possible to constantly produce crushed materials, it is possible to make the power consumption of the motor that drives the grinding member almost constant, and furthermore, it is possible to prevent the phenomenon of primary crushed materials passing through immediately after the supply of primary crushed materials to the grinding gap is started. It is an object of the present invention to provide a grinding material particle shape adjusting device that can prevent the above.

(Structure of the Invention) The grinding material particle shape adjusting device of the present invention is based on the above-mentioned
The basic structure of the grinding material particle shape adjusting device described in Japanese Patent No. 58-26975 is such that the grinding material can be adjusted by providing an adjusting face at the outlet of a grinding gap formed by a pair of opposing grinding members. It is the same as before that the discharge of the particles is delayed and accumulated, the grinding gap is filled with the material to be ground, and the grain shape is adjusted by the grinding action of grinding, compressing, crushing, etc. the particles.

The crushed material particle shape adjusting device of the present invention further provides a dedicated space for storing the primary crushed material above the entrance of the grinding gap, a level detector in the storage space, and a level detector for the primary crushed material supply feeder. A control device for adjusting the driving force is provided to automatically maintain the level of the primary crushed material stored in the storage space within a certain range and fill the grinding gap with the primary crushed material, The degree of grinding is always kept constant, the grinding action of the primary crushed material is constant, and the crushed material has a substantially constant range of particle shapes.

In addition, a power consumption detector is provided to detect the power consumption of the motor that swings the grinding member, and this detection signal operates the adjustment face piece control device to automatically control the displacement of the adjustment face piece, thereby increasing the grinding gap. The amount of primary crushed material in the grinder is adjusted to keep the electric power of the motor consumed for grinding the primary crushed material approximately constant.

Furthermore, the adjustment facepiece control device is operated by the level detection signal of the level detector, and when the level of the primary crushed material in the storage space is below a certain level, the adjustment facepiece is automatically closed and the discharge of the crushed material is completely stopped. This is intended to prevent the primary crushed material from passing through immediately after the supply of the primary crushed material to the grinding gap is started.

(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, and 5 is a power consumption detector for detecting the power consumption of the motor 4. Reference numeral 6 denotes a fulcrum of the adjustment face 3, and the adjustment face 3 swings vertically about the fulcrum 6 by driving a cylinder 7 connected to one end on the fixed grinding member 1 side. Reference numeral 8 denotes a hydraulic device that drives the cylinder 7. This hydraulic device 8 is operated by an adjustment face piece control device 9, and the adjustment face piece control device 9 responds to a detection signal from the power consumption detector 5 of the motor 4. It is now working properly. A dedicated storage space E for storing primary crushed materials is provided above the entrance A of the grinding gap B between the pair of opposing grinding members 1 and 2, and a feeder 10 is provided above the storage space E. It is provided. In the storage space E, a level sensor 1 is installed to detect the storage level of primary crushed materials.
1, 12, 13 are provided, and the level sensors 11, 12, 13 are connected to the feeder control device 1. Also, this level sensor 11, 12, 1
3 is also connected to an adjustment face piece control device 9, and the adjustment face piece control device 9 is configured to operate when the level of the primary crushed material in the storage space E is below a certain fixed value.

In the embodiment configured as described above, the primary crushed material supplied from the feeder 10 to the storage space E falls into the grinding gap B, but it is possible that the primary crushed material in the storage space E has not reached a certain level. It is detected by the level sensors 11, 12, and 13, and the detection signal is sent to the adjustment face piece control device 9, which operates the adjustment face piece control device 9, which operates the hydraulic device 8 and operates the cylinder 7. As a result, the adjustment face piece 3 rotates upward and closes the outlet C of the grinding gap B, and as a result, the primary crushed material fills the grinding gap B, and the grinding member 1 and the grinding member 3, which is rotated by the fixed grinding member 1 and the motor 4, The crushing member 2 provides sufficient crushing action. Then, the primary crushed material is continuously supplied to the storage space E above the grinding gap B, and when it comes to be stored in the storage space E, its level is detected by one of the level sensors 11, 12, and 13, The detection signal is sent to the feeder control device 14, which operates the feeder control device 14, causing the feeder 10 to
The driving force of is adjusted. As a result, the amount of primary crushed material supplied to the storage space E is adjusted, the level of the primary crushed material in the storage space E becomes constant, and the degree of filling of the primary crushed material in the grinding gap B is kept constant. Therefore, the degree of grinding is kept constant and a ground product with a constant grain shape can be obtained.

However, as mentioned above, the level sensors 11, 12,
13, when the level of the primary crushed material in the storage space E is detected, the detection signal is also sent to the adjustment face piece control device 9, the adjustment face piece control device 9 is activated, and the hydraulic system is thereby activated. 8 is operated,
The cylinder 7 operates in the opposite direction to the above, and the adjustment face 3 rotates downward, opening the outlet C of the grinding gap B by a predetermined amount and opening the discharge gap D. As a result, the grinding gap B remains constant at The ground material ground into particles falls from the outlet C and is discharged from the discharge gap D.

On the other hand, the power consumption of the motor 4, which is a driving source for swinging the grinding member 2 due to the grinding action of the primary crushed material in the grinding gap B, is detected by the power consumption detector 5, and the detection signal is adjusted. The adjustment facepiece control device 9 operates according to the detection signal, that is, according to the power consumption of the motor 4, the hydraulic device 8 is operated, the cylinder 7 is operated, and the adjustment facepiece 3 is moved upward. Alternatively, the amount of ground material discharged from the discharge gap D is adjusted by rotating downward. As a result, the amount of primary crushed material in the grinding gap B is adjusted, and the electric power of the motor 4 consumed to grind this becomes approximately constant.

The feeder 10 in the grinding material particle shape adjusting device of the above embodiment is a vibrating feeder, but any feeder such as a belt feeder that can adjust the feed rate may be used. Further, in the ground material particle shape adjusting device of the above embodiment, the level sensors 11, 1
2 and 13 are provided only in the storage space E,
Installed in the grinding gap B to detect the level there,
The adjustment face piece 3 can also be controlled based on the level.

(Effects of the Invention) As can be seen from the above explanation, the grinding material particle shape adjusting device of the present invention rotates the displaceable adjusting face piece provided below the outlet of the grinding gap upward immediately after supplying the primary crushed material. This prevents primary crushed materials from passing through. Therefore, the discharge of the crushed material can be delayed and retained, the grinding gaps can be filled with the primary crushed material, and the mutual abrasion, compression, and crushing effects among the particles can be sufficiently performed. In addition, a primary crushed material storage space is provided above the grinding gap, and the level of the primary crushed material supplied there is maintained within a certain range, so that a constant level of primary crushed material is always kept in the grinding gap. By adjusting the time and amount of filling and grinding, a ground product having a substantially constant range of particle shapes can be obtained. In addition, the power consumption of the motor that swings the grinding member is detected, and the displacement of the adjustment face piece is controlled by this, and the amount of primary crushed material in the grinding gap is adjusted. The electric power consumed by the motor can be kept approximately constant, and therefore the mutual abrasion, compression, and crushing action of particles during grinding can be kept constant, resulting in effects such as a significant improvement in grinding efficiency.

[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...Detector, 6...Fully point, 7...Cylinder, 8...Hydraulic system, 9...Adjustment face piece control device, 10...Feeder, 11, 12, 13...Level sensor, 14... Feeder control device, A...
...Entrance of the grinding gap, B...Grinding gap, C...Exit of the grinding gap, D...Grind material discharge gap, E...Storage space.

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 grinding material particle shape adjusting device comprising a displaceably disposed adjustment surface that forms a discharge gap on the side, a primary crushed material storage space is provided above the entrance of the grinding gap, and a level is formed in the storage space. A detector is provided, a feeder control device is provided for adjusting the driving force of the feeder for supplying the primary crushed material, a power consumption detector is provided for detecting the power consumption of the motor for swinging the grinding member, and An adjustment facepiece control device for controlling displacement is provided, and the feeder control device and the adjustment facepiece control device are operated by the level detection signal of the primary crushed material from the level detector in the storage space, and the power consumption of the motor is controlled by the power consumption detector. A grinding material particle shape adjusting device characterized in that an adjusting facepiece control device is operated by a detection signal of