JPS6241783B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention provides a method for 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 crushed material particle shape adjusting device that adjusts the particle size and shape by applying a crushing action to produce a ground material with 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. Virtually no grinding action occurs during grinding, compression, etc., and therefore particles often have a flat or oblong shape along the crushing gap, and the raw materials are in a coarsely crushed state, and secondary crushing This method had the disadvantage of producing irregularly shaped fragments with many sharp points.

Therefore, when this type of produced and crushed material is used, for example, as concrete aggregate, the amount of water,
This can lead to various problems such as the need to increase the amount of cement or water rising to the surface during curing, so this kind of crushed material cannot be used as a final product such as construction aggregate. It cannot be used as a product.

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 installed 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 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 adjustment face body 3 through the discharge gap D. In this process, since the adjustment face piece 3 is in a position that closes the outlet C, the ground material is not discharged immediately, but accumulates there, and the accumulation extends into the grinding gap B, causing the grinding Gap B will be filled with ground material. When the grinding gap B is expanded or contracted when the grinding gap B is filled with the ground material, the weak points of the ground material are crushed by the mutual abrasion, compression, and crushing action of the ground material, and the flat oblong particles and acute-angled protrusions are prioritized. The grain size is adjusted by grinding. 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. 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 order for this grinding material particle shape adjustment device to exhibit the above-mentioned effect, it is essential that the grinding gap B is always filled with the grinding material, and that the filled 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 constant 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.

(Object of the Invention) The present invention has been made in order to eliminate such drawbacks, and it is possible to adjust the amount of crushed material discharged from the discharge gap, thereby maintaining a state in which the grinding gap is always filled with primary crushed materials. But it can be used for grinding action.
In addition, by adjusting the time and amount of the primary crushed material being crushed in the grinding gap, it is possible to constantly produce crushed materials with a certain range of particle shapes, and the power consumption of the motor that drives the grinding member can be reduced. The object of the present invention is to provide a device for adjusting the particle shape of ground material that can be made uniform.

(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 gaps are filled with the material to be crushed, and the mutual rubbing, compression, and crushing effects of the particles are increased, thereby adjusting the particle shape. The grinding material particle shape adjusting device of the present invention further includes a detector that detects power consumption of a motor that swings the grinding member, and an adjusting face piece control device that controls displacement of the adjusting face piece, and detects the control device. The displacement of the adjustment face piece is controlled by operating the power consumption detection signal of the motor by the device.

(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 detector for detecting the power consumption of the motor 4. 6
is the fulcrum of the adjustment facepiece 3, and the adjustment facepiece 3 is attached to this fulcrum 6.
It is designed to swing in the vertical direction by driving a cylinder 7 connected to one end of the fixed grinding member 1 side. Reference numeral 8 denotes a hydraulic device that drives the cylinder 7, and this hydraulic device 8 is operated by an adjustment surface body control device 9. The adjustment face piece control device 9 is adapted to operate based on a detection signal of the power consumption of the motor 4 from the detector 5.

In the embodiment configured as described above, the primary crushed material supplied and filled in the grinding gap B is sufficiently grinded by the fixed grinding member 1 and the grinding member 2 which is oscillated by the motor 4. receive. The power consumption of the motor 4, which is the driving source for swinging one of the grinding members 2 that grinds the primary crushed material, is detected by the detector 5, and the detection signal is sent to the adjustment facepiece control device 9. , 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 rotated upward or downward. The amount of ground material discharged from the discharge gap D is adjusted. As a result, the particle shape of the primary crushed material ground within the grinding gap B falls within a substantially constant range, and the electric power consumed by the motor 4 to grind this becomes substantially constant.

(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 detector that detects the power consumption of the motor that swings the grinding member, and an adjusting face piece that controls the displacement of the adjusting face piece. Since the control device is operated by a detection signal of the power consumption of the motor by the detector to control the displacement of the adjustment face piece, the amount discharged from the discharge gap of the ground material is adjusted, and the As a result, the grinding gap is filled with the primary crushed material, and the time and amount of grinding are adjusted, so that the particle shape of the primary crushed material falls within a substantially constant range. The electric power consumed by the motor for grinding can be kept approximately constant, and therefore the mutual rubbing, compression, and crushing actions of particles during grinding can be kept constant, resulting in improved 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...Adjusting facepiece control device, A...Inlet of grinding gap, B... Grinding gap, C
...Exit of the grinding gap, D...Discharge gap of the 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 Next, in the grinding material particle shape adjusting device which is provided with a movable adjustment facepiece that forms a discharge gap on the side, a detector for detecting the power consumption of the motor that swings the grinding member, and a detector for detecting the power consumption of the motor that swings the grinding member, and a An adjusting facepiece control device for controlling displacement, and the control device is operated by a detection signal of power consumption of a motor by a detector to control displacement of the adjusting facepiece. Shape adjustment device.