JPS621931A - Method and apparatus for optimizing dipper cutting force of mining shovel - 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] Ml ± 9 Feathers 1 Supplement The present invention relates to a power mining excavator, and particularly to a power mining excavator that effectively uses the dimensions of the front end of the excavator and the extrusion and lifting power to reduce the cutting force of the optimum dipper. Concerning methods and devices for obtaining power consumption.

The power mining excavator has a lower stationary part coupled with an upper rotating part. The upper rotating part has a boom whose legs are attached to the front of the mining shovel body, and an arm that is rotatably supported around the boom's shipper shaft and applies a pushing force to the dipper. The lifting force is applied by connecting the cable from the boom point to the boom point. Dipper cutting force is determined by three separate and interrelated functions. (1) Boom geometry, especially the position of the second shipper axis, (2) Lifting force, (
3) Extrusion force. To obtain maximum dipper filling and fast cycle times, the cutting force in the dipper must be optimized. In order to obtain the required cutting force with little power loss, it is necessary to optimize the use of lifting extrusion horsepower.

In the known device, the operator adjusts the pushing force acting on the dipper and the lifting force of the cable by increasing or decreasing the output of the motor that generates the pushing force on the car and the motor that generates the pulling force of the cable as he deems correct. I adjusted it as follows. Extrusion force is O~105
It has a horizontal component force and a vertical component force within the range of 0° and 90°. The cable tension force also has horizontal and vertical components depending on the angle at which the lifting force occurs. It is clear from the conventional design of the front end of a power mining excavator that there is a point where the vertical or horizontal force components cancel each other out if the operator controls both forces. Detrimental or beneficial depending on the point at which the force offset occurs. For this reason, operator skill is required to effectively use the available power to obtain maximum cutting efficiency.

The point at which the shovel arm is pivoted to the boom, that is, the sipper shaft position is set at a position of 42χ of the distance from the boom leg to the boom point,
If the ratio between the maximum pushing force and the maximum lifting force is kept at approximately 1/2,
The optimum cutting force acts on the dipper. In other words, one operator does not need to be skilled in order to obtain the maximum cutting force, and
The maximum pushing force acting on the cable is kept at 172 of the maximum lifting force acting on the cable. This is done manually by the operator or automatically using a sensor to know the maximum extrusion force and maximum lifting force, and uses this information to control the maximum extrusion force acting on the extrusion motor, and the maximum extrusion force acting on the cable motor. Lifting force 1
Do not exceed 72.

The object of the present invention is to optimize the cutting force of a dipper in a powered mining machine.

Another object of the invention is to optimize the front end geometry of a power mining machine in conjunction with the extrusion force lifting force.

Another object of the present invention is to mount the shipper shaft at a point approximately 42x apart from the boom leg of the boom and the boom point.

The distance from the boom leg to the boom point is 39 to 45x.

Another object of the present invention is to determine the ratio between the maximum pushing force and the maximum lifting force,
The maximum extrusion force is maintained at about 172 of the maximum lifting force, and the maximum extrusion force is maintained within a range of 0.45 to 0.55 of the maximum lifting force.

A method of optimizing the cutting force of the dipper of a mining excavator according to the present invention is to have an arm that applies a pushing force to the dipper, and to make the arm rotatable on the boom about the sipper shaft. The boom has an outer boom point, the legs are attached to the mining excavator body, and a cable is connected to the excavator from the boom point to apply lifting force, and the pushing force and lifting force are the combined cutting force. In order to optimize the cutting force of the mining excavator's dipper, which forms The ratio of the maximum extrusion force to the value of the maximum lifting force is
Keep the value equal to 172;
Optimize l@power.

The device for optimizing the cutting force of the dipper of a mining excavator according to the present invention has an arm that applies a pushing force to the dipper, the arm is rotatably pivoted to the boom about the sipper shaft, and the boom is externally mounted. The legs are attached to the main body of the mining excavator, and the cable is connected to the digging shovel from the boom point to apply lifting force, and the pushing force and lifting force form a composite cutting force. - A device that optimizes the cutting force, attaches the sipper shaft to the boom at a point in the range of 39 to 45χ of the distance from the boom leg to the boom point, and determines the ratio of the maximum extrusion force to the maximum lifting force to the maximum extrusion force. is maintained at a value equal to the maximum lifting force value of 172, thereby optimizing the dipper cutting force.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples and drawings illustrating the present invention will be described.

Figure 1 shows a side view of a typical power mining excavator IO.
A rotating frame 14 is coupled to the lower part 12. A boom 16 is attached to the front end of the rotating frame 14, and is supported and held in place by cables or ronds 18, and has a shovel 22 at the end of an arm 20 attached to the boom. Arm 20 exerts a pushing force in the direction of arrow 32 and is pivoted on boom 16 at a point 24 known as the shipper axis. A pulley 27 is supported on the boom end 25 and a cable 28
passes through pulley 27 and connects to point 30 of dipper 22 to exert a lifting force in the direction of arrow 34. The resultant cutting force resulting from the geometrical relationship between the push force in the direction of arrow 32 and the lifting force in the direction of arrow 34 is indicated by arrow 36. A required motor (not shown) pushes the arm 20 in the direction of arrow 32 to obtain the required pushing force.

Cable 28 is connected to the required motor, not shown, to provide the required lifting force in the direction of arrow 34.

When the sipper shaft position 24 moves up or down along the boom 16, the angle between the pushing effect 32 and the lifting force 34 changes and the resulting cutting force 36 changes. Ditsupa - Arm 20 is at an angle of 38
If (θ) is at a position other than 0° or 90°, the extrusion force has a vertical component force and a horizontal component force. Angle 38 is greater than 0°9
When it is smaller than 0°, the vertical component of the extrusion force is downward,
If the angle O of the arm 20 is greater than 90°, the vertical component of the pushing force is directed upward.

Similarly, if the attachment point 30 on the dipper 22 is behind the perpendicular line drawn from the point 26 on the boom, the horizontal component of the lifting force acting on the dipper 22 of the cable 28 is to the left, or forward, and vertical. The component force is upward. If point 30 of dipper 22 is forward of the perpendicular from point 26, the horizontal component of the lifting force will be to the right or rear in FIG. 1 and the vertical component will be upward. If the rearward horizontal component of the cable lifting force 34 is greater than the forward horizontal component of the pushing force 32, the handle 20
move backwards from the surface of the material to be worked on. Thus, when the dipper handle angle is around 90 degrees, if the horizontal component of the cable lifting force 34 is to the right or rear of the machine.

This force increases rapidly and causes power loss when the pushing force 32 is low. On the other hand, when the extrusion force is excessively high, the resultant cutting force is more than necessary, resulting in power loss in the extrusion and lifting directions.

For maximum or optimum cutting force for the full range of dipper handle angles from 0 to 105 degrees, a maximum push force of 3
2 is approximately 1/2 of the maximum cable lifting force 34, and the shipper axis position 24 of the dipper handle 20 is approximately 42x the distance between the boom leg 17 and the boom point 26. Shipper axis position is approximately 39-45 of the distance from boom leg to boom point 26
It can be changed within a small range of χ. On either side of this range the power loss or deficit increases rapidly.

Furthermore, when the maximum push force 32 is low relative to the maximum lift force 34, the force available as a resultant cutting force 36 at the cutter 22a decreases rapidly as the dipper handle angle increases. On the other hand, when the maximum pushing force 32 is larger than the maximum cable pulling force 34, power loss occurs at all handle angles. The ratio of maximum extrusion force to maximum cable force ranges from 0.45 to 0.55, with the optimum value being 0.5 or 1/2.

When the sipper pivot point 24 is in the proper position on the boom, the ratio between the optimum push force and the cable pull force can be determined by the operator by looking at a display device that visually displays the maximum push force and the maximum pull force, or A sensor is installed in the motor that receives the extrusion force and tensile force, and the motor output is used to automatically maintain the ratio of the maximum extrusion force to the tensile force at 1:2 ±10χ. As shown in FIG. 2, according to the present invention, the optimum force and front end dimensions are set to the above-mentioned values.

The cutting force is almost constant over the entire range of the dipper handle angle from 0 to 05 degrees.

Thus, in order to optimize the cutting force of the shovel of a powered mining machine, the present invention provides a sipper shaft on the boom with a distance of about 42χ from the boom leg to the boom point, and the maximum pushing force and maximum tensile force are The ratio of the maximum extrusion force to the maximum tensile force is determined to be approximately 172 times the maximum tensile force.

Although the present invention has been described with reference to preferred embodiments, the embodiments and drawings are illustrative and do not limit the invention.

[Brief explanation of the drawing]

Fig. 1 is a side view of a power mining excavator showing the front end including the sipper shaft position, extrusion force, cable tension force, and composite cutting force; Fig. 2 is a side view of a power mining excavator; This is a graph to obtain the cutting force.

Claims (1)

[Scope of Claims] 1. It has an arm that applies a pushing force to the dipper, and the arm is rotatably supported on the boom about the shipper shaft,
The boom has an outer boom point, and the legs are attached to the mining excavator body, and a cable is connected to the dipper from the boom point to apply lifting force, and the pushing force and lifting force form a composite cutting force. To optimize the dipper cutting force of , install the sipper shaft on the boom at a point in the range of 39-45% of the distance from the boom leg to the boom point, and calculate the ratio of the maximum push force to the maximum lifting force as the maximum push force. A method for optimizing the dipper cutting force of a mining excavator, characterized in that the dipper cutting force is kept at a value equal to 1/2 of the value of the maximum lifting force, thereby optimizing the dipper cutting force. 2. The method for optimizing the dipper cutting force of a mining shovel according to claim 1, characterized in that the sipper shaft is attached to the boom at a point 42% of the distance from the boom leg to the boom point. 3. The method for optimizing the dipper cutting force of a mining shovel as set forth in claim 2, characterized by maintaining the ratio of the extrusion force to the lifting force in the range of 0.45 to 0.55. . 4. It has an arm that applies a pushing force to the dipper, and the arm is rotatably supported on the boom about the shipper shaft,
The boom has an outer boom point, the legs are attached to the mining excavator body, and a cable is connected to the dipper from the boom point to apply lifting force, and the pushing force and lifting force form a composite cutting force. A device that optimizes the dipper cutting force of Extrusion force is 1 of the maximum lifting force value
A device for optimizing the dipper cutting force of a mining excavator, characterized in that the device comprises: a device for maintaining the dipper cutting force at a value equal to /2, thereby optimizing the dipper cutting force. 5. Optimizing the dipper cutting force of the mining excavator according to claim 1, further comprising a device for attaching the sipper shaft to the boom at a point 42% of the distance from the boom leg to the boom point. Device. 6. Optimizing the dipper cutting force of the mining shovel according to claim 2, further comprising a device that maintains the ratio of the extrusion force to the lifting force within a range of 0.45 to 0.55. A device that does this.