JPH0741946B2 - Double type feeding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial field of use" The present invention relates to a double-type input device for inputting a large amount of an object to be weighed into a weighing hopper of a weighing scale and subsequently for small-scale input.

[Prior Art] A dosing device for a weighing hopper of a weighing scale has conventionally been provided with a large dosing fan-shaped gate in which a dosing hole is formed in the dosing hopper, and the material flow is cut laterally by the gate from one direction. Since the injection control was performed (Fig. 5), there were the following problems.

(1) Since the gate cuts at a right angle to the flow of material, the flowing material is rolled up and clogging occurs, and biting occurs between the hopper and the gate, and a gap of the thickness of the biting is required. Then, leakage occurs from the gap, and material scatters at the time of cutting.

(2) Leakage and scattering also occur between the large throw and small throw gates due to the gap between the hopper and the large throw gate.

(3) Large and small throws cannot be adjusted.

(4) The small throwing opening is made by opening a small hole in the lower surface of the large throwing gate, but the material temporarily stops in the hopper where the material flows, and the upper pressure is gradually applied so that the internal pressure of the hopper is always constant. Instead, it flows into the small pouring port and becomes a complicated flow of the material, which is not constant and the small pouring port is clogged with the material.

Generally, in a quantitative scale, since the amount of head (the amount in the middle of the air) is all input, if the flow rate is not constant, the accuracy and time will vary.

[Problems to be Solved by the Invention] The present invention solves the problems (1), (2), (3) and (4) described above, and the upper space of the object to be weighed in the weighing hopper is small and the weighing hopper is small. The purpose is to improve the accommodation rate.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the present invention extends downward from the lower end opening of a square-tube-shaped object-to-be-measured loading hopper provided in a machine frame to the front and rear facing plates of the hopper. , These facing plates are formed with vertically symmetrical left and right sloping downward sloping edges directed toward the center line from the left and right sides, respectively, and an opening and closing plate in the front-rear direction is provided on the lower sloping downward edges, and the opening and closing plates An adjusting device is provided so that a small insertion port can be formed by the gap between the opening and closing plates,
In addition, a guide slanting plate in the front-rear direction is installed on the left and right upper sloping downward edges to form a large charging opening between the lower edges of the guiding slanting plate, and the spacing between the guiding slanting plates is adjustable to form the above-mentioned charging. Double type throwing device with adjustable mouth The double type throwing device according to the above invention is provided with a safety gate which is rotatable right and left from directly below the middle of the left and right opening / closing plates.

"Operation" Therefore, the object 10 to be weighed, such as powder or granular material, is supplied to the input hopper 2. Of course, in that state, FIG. 3 (a) and FIG. 4 (a)
As shown in the figure, the front-rear direction opening / closing plates 4 and 4 are closed. In that state, when the opening / closing plates 4 and 4 are opened to the left and right and the safety gate 9 is rotated to the left or right at the same time, it is surrounded by the front and rear facing plates 3 and 3 and the left and right front and rear direction tilting plates 7 and 7. The object 10 to be weighed is thrown into the weighing hopper 11 from the charging port 8 (FIGS. 3 and 4 (b)). When the opening adjusting device 5 is operated, the opening / closing plates 4 and 4 are closed to a width narrower than the width of the large charging port 8 and stopped to start small charging (Figs. 3 and 4 (c)). (Fig.), Weighing is started. Immediately after closing the opening / closing plates 4 and 4 by the operation of the adjusting device 5, the safety gate 9 is located at the original position (the opening / closing plates 4 and 4) immediately above the drop amount 10 '(Fig. 4D). Just below the closed bottom of
After that, the weighing operation of the weighing hopper 11 is completed. After weighing, the lower gate of the hopper 11
12 opens and closes, the object 10 to be weighed falls from the hopper 11, and the same operation as described above is repeated. The large charging port 8 can adjust the large charging amount by adjusting the distance between the lower edges of the left and right guide slanted plates 7, 7, and the impurities can be added between the lower facing edges of the opening / closing plates 4, 4. The safety gate 9 can catch the leak and prevent it from falling.

"Embodiment" The machine frame 1 is provided with a square tube-shaped object loading hopper 2, and front and rear facing plates 3 and 3 are extended downward from a rectangular lower end opening 2 '. The facing plates 3 and 3 are formed by forming vertically symmetrical left and right sloping edges 3 ', 3'and 3 ", 3" from the left and right sides of the opening 2'toward the upright center line c in two steps. Guide slanting plates 7, 7 extending in the front-rear direction are installed on the upper downward slanted edges 3 ″, 3 ″, and a large input port 8 surrounded by the lower edges of the guide slanting plates 7, 7 and the facing plates 3, 3. Is formed. The width of the large insertion opening 8 in the left-right direction is such that the opposite-sided screw rods 15 on both sides are screwed into the female screws 14, 14 rotatably provided on the guide inclined plates 7, 7 by the pins 13. By rotating, the lower edges of the inclined plates 7, 7 can be adjusted by moving them in the left-right direction, and the area of the large insertion port 8 can be expanded / contracted. Further, front and rear opening / closing plates 4 and 4 are arranged on the lower left and right lower sloping edges 3'and 3 ', respectively, and the upper end portions of the arm plates 4'and 4'provided in front of and behind the opening / closing plates 4 and 4, respectively. Is pivotally attached to the side surface of the input hopper 2 by pins 16 and 16, and the pins 16 and 16 are moved from the closed position shown in FIG. 3 (a) to the open position shown in FIG. 3 (b). It can be opened and closed, and its opening and closing operation can be performed by the hydraulic cylinders 17, 17. An opening adjusting device 5 is slidably adjusted along the cylinder 17 on the cylinders 17, 17. This adjusting device 5 is formed by a proximity switch for detecting the lowering of the piston 17 'in the cylinder 17, and when the piston 17' descends to a certain position, it issues a command signal to control the solenoid valve to make the lowering. The arm plates 4 ', 4'are stopped at the stop position.
And the rotation of the left and right open / close 4, 4 is stopped, and the gap between the lower edges of the open / close plates 4, 4 is held at the stop position, and the small opening 6 is provided by the gap (Fig. 4 (c)). Can be formed. On the side surface of the hopper 2, fan-shaped arm plates 9 ', 9'
And a safety gate 9 is erected on the lower ends of the arm plates 9'and 9 ', and the operating arm is provided on the upper ends of the arm plates 9'and 9'.
A drive cylinder 20 is connected to 19, and the safety gate 9 can be rotated by the cylinder 20 from the position shown in FIG. 3 (a) to the position shown in FIG. 3 (b). The opening / closing device for the opening / closing plates 4 and 4 is the hydraulic cylinders 17 and 17 described above.
Not limited to the electric cylinder, the opening adjustment device 5
It is possible to use a limit switch for. The reference numeral 21 in the figure denotes an electronic scale (load cell) of the weighing hopper 11.

"Effects of the Invention" Since the present invention is configured as described above, the object 10 to be weighed is placed between the lower end opening 2'of the input hopper 2 and the front and rear facing plates 3 and 3 along the facing plates 3 and 3 in the vertical direction. The opening and closing plates 4 and 4, which are rectified in the downward direction and symmetrically arranged, open and close, so that the internal pressure is maintained in a uniform state in the feeding hopper 2, and material clogging, scattering, and leakage at the time of closing are prevented. Not only is it possible to measure, but also large and small batches to be weighed.
10 is supplied at a constant flow rate to improve the measurement accuracy. Further, the small charging port 6 is formed by the gap between the lower edges of the opening and closing plates 4 and 4 facing each other, and the upper surface of the object 10 to be metered into the weighing hopper 11 forms an angle of repose on both sides of a substantially horizontal top. Therefore, unlike the conventional conical upper surface, there is an effect that a wasteful space in the hopper 11 can be reduced, and that a small input amount can be adjusted by the opening adjustment device 5.

In addition, the large amount can be adjusted by adjusting the interval between the lower edges of the guide slant plates 7 and 7, and there is an effect that it can correspond to the size of the measurement.

[Brief description of drawings]

FIG. 1 is a front view showing a double throwing device of the present invention, FIG. 2 is a partially cutaway side view of FIG. 1, and FIG. 3 (a) (b) (c)
The figures show the front view of the closed, full throw, and small throw states, respectively.
Figures (a), (b), (c), and (d) are front views of the state before charging, large charging, small charging, and cutting, respectively, and FIG. 5 is a front view of a conventional charging device. 1 ... Machine frame, 2 ... Loading hopper to be weighed, 2 '... Lower end opening, 3 ... Counter plate, c ... Center line, 3', 3 "... Sloping edge, 4 ... Opening / closing plate, 5 …… Opening adjustment device, 6 ……
Small input port, 7 ... Guide ramp, 8 ... Large input port, 9 ...
Safety gate.

Claims (2)

[Claims] 1. A square-cylindrical object-loading hopper provided on a machine frame extends downward from front and rear facing plates of the hopper, and these facing plates face the center line from both left and right sides. Left and right downward sloping edges are formed in two steps, upper and lower sloping edges are provided with an opening / closing plate in the front-rear direction, and an opening adjustment device for the opening / closing plate is provided so that a small gap is provided between the opening / closing plates. It is not possible to form the mouth, and the front and rear guide slanting plates are installed on the upper and lower downward slanted edges to form a large insertion opening between the lower edges of the guide slanting plate, and the spacing between the guide slanting plates is adjusted. A double dosing device that can be freely formed to adjust the large dosing port. 2. The double dosing device according to claim 1, further comprising a safety gate which is rotatable rightward and leftward from directly below the middle of the left and right opening / closing plates.