JPH0457472B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is a method for producing abrasive materials such as shot and grit that fall in a strip under their own weight using a projection device comprising a plurality of wide plates radially attached to a rotating shaft. This invention relates to a method of projecting an abrasive material by hitting it toward a steel plate.

(Prior Art and Problems) In recent years, the above-mentioned abrasive jetting method has been developed and attempts have been made to use it for cleaning steel plates. By the way, in general, it is easy to remove scale from a steel plate from the center part, but it is relatively difficult to remove scale from the side parts, and therefore, a larger amount of abrasive projection energy is required for the side parts. Therefore, the abrasive material is dropped and supplied to the projection device intermittently in the width direction of the steel plate, and the projection energy of the abrasive material is varied in the width direction of the steel plate. The abrasive material is supplied by dropping the abrasive material by elongating the discharge port of the abrasive material storage hopper in the same direction as the width of the steel plate and partitioning it into multiple sections.Each of the partitioned discharge ports is equipped with a slide gate that can move up and down. This is done by adjusting the opening degree of each outlet. The opening degree of each discharge port of the hopper that can be adjusted in this way is stored in the control panel for several types of steel plates, so that it can be adjusted to correspond to each type of steel plate.
If the abrasive material or parts wear out after long-term use, or if impurities get mixed into the abrasive material, the energy used to project the abrasive material changes, creating a new problem where the steel plate cannot be polished to the desired condition. are doing.

(Object of the invention) The present invention was made in view of the above circumstances, and
It is an object of the present invention to provide an abrasive material projection method that allows the projection energy of the abrasive material to be easily and reliably automatically changed to a desired magnitude.

(Means for Solving the Problems) The present invention provides an abrasive material projection method that uses a projection device comprising a plurality of wide plates radially attached to a rotating shaft, and directs the abrasive material falling in a belt shape onto a steel plate. In the abrasive material projection method, the flow of the abrasive material falling in the band shape is divided into a plurality of parts in the width direction, and the flow rate of each divided abrasive material falling flow can be changed, Before the start of sweeping work, the projected energy associated with each divided abrasive material falling flow is detected, the difference projected energy between each detected projected energy and a preset projected energy is calculated, and the difference projected energy is calculated. The present invention is characterized in that corrected projected energy is calculated by adding each to the actual side projected energy, and the flow rate of the falling abrasive material is changed to an amount corresponding to the corrected projected energy.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings. FIG. 1 schematically shows an apparatus for implementing the present invention, which includes a hopper device 1 that supplies abrasive material to an abrasive material projection device, and a hopper device 1 that supplies abrasive material to an abrasive material projection device (not shown). It is comprised of a detection device 2 that detects projection energy, and a control device 3 that operates the detection device 2 and electrically connects to the hopper device 1. The hopper device 1 and the abrasive material projection device are constructed as shown in FIGS. 2 and 3. That is, the hopper 4, which is installed on the ceiling of a cabinet (not shown) and allows the abrasive material to fall under its own weight in a band that spreads left and right, has a downward slope toward the front (see Figure 3), and a hopper 4 that protrudes slightly forward. A bottom plate 4a is provided.

Further, at the front bottom of the hopper 4, there are a plurality of partition members 5a to 5j each having a cross-sectional shape and having the same length as the protruding portion of the bottom plate 4a of the hopper 4.
are lined up in a row in the left-right direction and are fixed adjacent to each other, and a plurality of discharge ports 6a to 6j are formed at the bottom of the hopper 4. Further, the discharge ports 6a to 6j are opened and closed by a plurality of slide gates 8a to 8j which are vertically movably disposed on the front surface of the hopper 4 via electric cylinders 7a to 7j. Gates 8a-8j
is supported from the front and back by three rollers 9a to 9c rotatably installed between the left and right side plates of the hopper 4. Further, an introduction pipe 10 having a slit extending in the left-right direction is integrally fixed to the lower end of the bottom plate of the hopper 4 so as to be oriented in the vertical direction. 11a to 11j are electric cylinders 7a to 7
This is a limit switch that is fixed to the piston rod of the slide gate 8j and detects the vertical movement of the slide gates 8a to 8j. Further, the electric cylinders 7a to 7j are electrically connected to a control device (not shown). Also,
Below the introduction pipe 10, a rotation shaft 12 extending in the left-right direction along the slit of the introduction pipe 10 is spaced apart from the introduction pipe 10 and rotatably supported by two bearing units 13, 13. A plurality of wide plates 14 are arranged on the rotating shaft 12.
a to 14l are attached radially. Further, a guide pipe 35 for guiding the collected abrasive material faces the upper opening of the hopper 4. Further, the detection device 2 is constructed as shown in FIGS. 4 and 5. That is, the base end of a strip-shaped measurement plate 17 is attached to the upper surface of a rectangular parallelepiped-shaped attachment member 16 that is disposed so as to be movable in the left-right direction via the movable cart 15, and the base end of the measurement plate 17 near the base of the measurement plate 17 is Strain gauges 18 and 19 are attached to the upper and lower surfaces, respectively. Further, a disk-shaped target 20 is fixed to the upper surface near the tip of the measurement plate 17 via a support 21. The upper surface level of the target 20 is the same as the upper surface level of the steel plate to be polished. Further, a case 22 that surrounds the measurement plate 17, the target 20, etc. from both front and rear sides is attached to the mounting member 16 on the right side, and the case 22 has the measurement plate 17, the strain gauge 1
A first cover 23 is attached that surrounds 8, 19, etc. from the upper surface and both left and right side surfaces. An opening 24 through which the projected abrasive material passes is formed in the first cover 23 directly above the target 20. A first shielding member 25 that prevents the material from hitting the target 20 is integrally fixed to the first cover 23, and the first shielding member 25 consists of two sheets as shown in FIG. It has a structure in which two pairs of second shielding plates 26b, 26b are arranged vertically at appropriate intervals between the first shielding plates 26a, 26a, and are arranged in a figure eight shape. Further, at the bottom of the case 22, there is a second M-shaped cross section that surrounds the measurement plate 17, the strain gauge 19, etc. from the bottom side and allows the abrasive material that has entered the case 22, the first cover 23, etc. to slide down and be discharged. A cover 27 is attached. Further, a second shielding member 28 is provided above the strain gauge 18 on the inner surface of the case 21 to prevent abrasive materials that have bounced off the inner surfaces of the second shielding plates 26b, 26b, etc. from hitting the measurement plates 17, etc. is fixed.

Further, the control device 3, as shown in FIG.
Measuring means 29, calculating means 30 and command means 31
It is made up of. The measuring means 29 is provided with a strain gauge measuring circuit.
Further, the calculating means 30 is electrically connected to the measuring means 29, and the calculating means 30 stores target values corresponding to the stress of the measuring plate 17 in the width direction of various objects to be polished. The value is the value of the measurement plate 17 when the abrasive material projected by the high-speed rotating plates 14a to 14l collides with the target 20 at the desired projection speed or amount and the measurement plate 17 is deflected. It's stress. Then, in the calculation means 30, the target value set based on the object to be polished,
The difference is calculated from the actual measured value of the stress on the measuring plate 17 input from the measuring means 29, and further, based on this difference, the required amount of abrasive material, that is, the upward stroke of the electric cylinders 7a to 7j is calculated. do. The calculation means 30 is electrically connected to the electric cylinders 7a to 7j via a command means 31.

Next, the operation of the device configured as described above will be explained. A target value related to the stress of the measurement plate 16 corresponding to the steel plate of the object to be polished is set in advance in the calculating means 30, and a drive device (not shown) is driven to move the plurality of plate materials 14a to 14l through the rotating shaft 12. After rotating the slide gates 8a to 8j at high speed in the direction of the arrow, when a command to start work is input to the control device 3, the slide gates 8a to 8j
are respectively raised to a predetermined height and the discharge ports 6a~
6j are opened all at once, and as a result, the abrasive material whose flow rate is intermittently changed in several types in the width direction of the introduction pipe 10 is allowed to fall by its own weight onto the plates 14a to 14l, and the fallen abrasive material is The scavenging materials are blown away by the plate materials 14a to 14l that rotate at high speed. Therefore, when the steel plate to be polished is flowed in the front-back direction at a position below the rotating shaft 12, the steel plate is bombarded with abrasive materials with different projected energies intermittently along the width direction, and the steel plate is brought into the desired state. be polished.

If the above-mentioned abrasive work is performed on the steel plate or another steel plate for a relatively long period of time, the abrasive material or parts are worn out, or the abrasive material is contaminated with impurities, and the energy of the abrasive material projection changes accordingly. In this step, the abrasive projection energy is checked using the detection device 2, and the opening degrees of the discharge ports 6a to 6j are readjusted. That is, after moving the detection device 2 to the left end, the abrasive material is projected by the operation described above, and the abrasive material supplied from the discharge port 6a is first projected onto the detection device 2. Then, a part of the projected abrasive material passes through the first shielding plate 25 and the opening 24 in order and collides with the upper surface of the target 20, and the collision of the abrasive material causes the measuring plate supported in a cantilevered manner to 17 is deflected, and this deflection is detected by strain gauges 18 and 19 and inputted to measuring means 29 as an electrical signal. By inputting this electric signal, the measuring means 29 calculates the stress of the measuring plate 17 at that time and inputs it to the calculating means 30. Upon input of this stress, the calculation means 30 first calculates a difference from the actual stress value and a preset stress target value, and then adds the difference to the actual stress value to calculate a corrected value.

Next, the corrected value is inputted to the electric cylinder 7a via the specifying means 31. As a result, the electric cylinder 7a is driven forward and backward, and the slide gate 8
a is moved up and down, the opening degree of the discharge port 6a is adjusted and corrected, and the correction is stored in the calculating means 29. Thereafter, the detection device 2 is intermittently moved to the right and the above-described operations are performed for each of the electric cylinders 7b to 7j. As a result, the projection energy of the abrasive material projected from the projection device is corrected to the original target projection energy.

(Effects of the Invention) As is clear from the above description, the present invention provides a polishing device that is divided into a plurality of parts in the width direction of the projection device and projected with different projection energies before starting the polishing work. Detect the projected energy for each projected flow of the scavenging material, add the detected projected energy to each preset projected energy to calculate the corrected projected energy, and then,
Since the falling amount of the abrasive material is corrected and changed in accordance with this corrected projection energy, even if the projection energy of the abrasive material fluctuates after a relatively long period of use, it is possible to easily and accurately adjust the target projection energy. It has an excellent effect that can be corrected.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an apparatus for carrying out the present invention, FIG.
The figure is a front view of the abrasive material projection device, Figure 3 is a partially cross-sectional left side view of Figure 2, Figure 4 is an enlarged detailed view of section A in Figure 1, and Figure 5 is B to B in Figure 4. It is a sectional view of B.

Claims (1)

[Claims] 1. In an abrasive material projection method that uses a projection device consisting of a plurality of wide plate materials attached radially to a rotating shaft and hits the abrasive material falling in a band shape toward a steel plate, the abrasive material falling in the band shape is The flow of the abrasive material is divided into a plurality of parts in the width direction, and the flow rate of each divided abrasive material falling stream can be changed, and the projected energy related to each of the divided abrasive material falling streams is set before the start of the cleaning work. , calculate the difference projection energy between each of the detected projection energies and the preset projection energy, calculate the corrected projection energy by adding each of the difference projection energies to the measured projection energy, and calculate the corrected projection energy. An abrasive material projection method characterized in that the flow rate of the abrasive material falling flow is changed to an amount corresponding to the energy.