JPH04115032U - Hoppa scale simple inspection device - Google Patents

Abstract

(57) [Summary] [Purpose] To maintain reliable accuracy and save labor by performing simple inspection of the hopper scale by remote control. [Structure] The load of the hopper 1 is measured by multiple load cells 4 installed on the pedestal 3. In order to easily inspect the hopper scale to be measured, a test weight 8A consisting of a sealed tank is suspended from a support arm 6 attached to the side of the hopper 1 via a cylinder 7, and the tank is filled with water. By changing the liquid level, at least two test load values can be obtained. This allows fixed point inspection and span inspection to be performed simultaneously.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a simple test for hopper scales used for quantitative cutting of powder and granular materials. related to inspection equipment.

0002

[Conventional technology]

Traditionally, hopper scales have been used to measure the weight of weighed objects such as powder and granules. Load cells are often used to detect the load. For example, Figure 4 An example is shown in which a hopper 1 is placed on a pedestal 3 via a support member 2. The pressure inside the hopper is supported by a plurality of compression type load cells 4. The load of the weighed object is measured. Note that hopper 1 is a check rod stretched horizontally. The position in the horizontal plane is semi-fixed by the door 5, and lateral vibration due to vibration etc. is prevented. (For example, Industrial Measurement Handbook (edited by the Japan Society of Precision Machinery and the Society of Instrument and Control Engineers, published in 1982, p. 504) , 505).

0003 By the way, when inspecting such a load cell type hopper scale, It is common for the hopper 1 to be loaded with weights and periodically inspected for scale. but The work of loading weights into the hopper requires handling the heavy weights. It is also very difficult to work because it has to be done in a limited space. As such, it has long been one of the areas in high demand for automation. like this As a solution to this problem, for example, as shown in Figure 5, a By expanding and contracting the cylinder 7 suspended from the supporting arm 6, the cylinder 7 is placed on the ground. There is a method of testing by raising and lowering the attached test weight 8.

0004

[Problem that the idea aims to solve]

However, the device shown in FIG. 5 described above is equipped as shown in FIG. Since only fixed points can be inspected using the weight value A of the inspection weight 8, the inspection load Even if the weight value A is within the allowable error, there will be an error at other load points B. The problem is that the difference may be large. In other words, the test weight load value (standard The relationship between the measured value (output value from the load cell) and the measured value (output value from the load cell) is the relationship shown by the solid line a in Figure 6. However, if only the weight value A is tested, even if the test result is within the allowable error. Even if it is within the range, the error is large at other load points B, for example, the one in Figure 6. There may be a relationship as shown by dotted chain line b or c. Therefore, Normally, the zero point is checked with the hopper empty. However, in this case, it is necessary to check that the weighed object does not adhere to the side wall of hopper 1. It becomes necessary. Alternatively, to test another load point B, change the test weight 8 to a different weight value. One option is to replace it with something else, but it would have to rely on human labor on site. Therefore, it is still a problem. This invention aims to solve the conventional problems as mentioned above. The aim is to provide a simple remote-controlled inspection device for hopper scales. The porpose is to do.

[0005]

[Means to solve the problem]

This invention suspends test weights through a cylinder in the hopper of a hopper scale. A device for easily inspecting the hopper scale, the device being sealed in the inspection weight. A tank is used, and a supply pipe is connected to this tank to supply the liquid through an automatic shut-off valve. At the same time, there is an automatic shut-off valve for draining liquid at the bottom, and a different level on the side. At least two automatic shut-off valves for level adjustment shall be installed in each This is a simple inspection device for hopper scales.

[0006]

[Effect]

According to the present invention, a closed tank is used as a test weight, and the inside of the tank is compared to There are two automatic shields installed at different levels on the sides of a liquid such as water. Since the liquid overflows from one side of the valve, it is added to the hopper. It is possible to secure at least two points as load values during inspection, and this allows hot It is also possible to easily test whether the linearity of the pass scale is good or bad.

[0007]

【Example】 Embodiments of the present invention will be described in detail below with reference to the drawings. Figures 1 and 2 As shown, the test weight 8A of the present invention, which is suspended by the cylinder 7, contains liquid and For example, a closed tank 11 containing water is used. This tank 11 has a horizontal surface. The tank is placed on a tank stand 12, and liquid is supplied from a supply pipe 14 via an automatic shutoff valve 13. In addition, an automatic shutoff valve 15 is provided at the bottom of the tank 11, and a drainage valve is provided on the side of the automatic shutoff valve 15. Automatic shutoff valves 16, 17 are installed at different levels. In addition, measuring the liquid temperature A temperature sensor 18 is also installed.

[0008] Here, the leveling of the tank mount 12 is done to keep the liquid level in the tank 11 level. This is to keep the liquid level constant and prevent the amount of liquid from changing depending on the level. Ru. In addition, two automatic shutoff valves 16 and 17 are installed on the side of tank 11 at different levels. The liquid level is reduced to a low level by opening the lower automatic shut-off valve 16. Since it can be held at LL, the inspection load can be kept at a low value, while the automatic shutoff valve at the bottom 16 and open the upper automatic shut-off valve 17 to increase the liquid level. Since the inspection load can be maintained at HL, the inspection load can be set to a high value, which allows the two constants to be This is to enable inspection to be performed using point load values. In addition, the level of the liquid When calculating the load, it is necessary to correct it using the liquid temperature measured by the temperature sensor 18. There is a point.

Therefore, during inspection, the automatic shutoff valve 13 is opened, a predetermined amount of liquid is supplied from the supply pipe 14, the tank 11 is lifted up by the cylinder 7, and the load on the tank 11 at that time is measured. , its operation will be explained using the time chart of FIG. First, after confirming that the rod of the cylinder 7 is extended, that is, the tank 11 is placed horizontally on the tank frame 12, and the automatic shutoff valve 15 is closed, the inspection is started at time _tB . The automatic shutoff valves 16 and 17 are opened, and after a certain period of time _T1 has elapsed, the automatic shutoff valve 13 is opened to supply liquid from the supply pipe 14 to the tank 11. When the liquid level in tank 11 reaches LL, liquid above that level will overflow from automatic shut-off valve 16. Therefore, when a certain period of time T ₂ has elapsed since the automatic shut-off valve 13 started to be opened, the automatic shut-off valve 13 starts to be closed, and after a time T ₃ has elapsed, the automatic shut-off valves 16 and 17 are closed. When time _T4 has elapsed since the automatic shutoff valve 13 began to close, the cylinder 7 is activated to contract the rod, lift the tank 11, and apply a load to the hopper 1. After time _T5 has elapsed, that is, when time _t1 has elapsed from the start of the test, the first test load value _W1S is measured during time _T6 , and the weighed value _W1 at that time is read. After time T ₆ has elapsed, the cylinder 7 is actuated to extend the rod and the tank 11 is lowered and placed on the tank mount 12. After time T ₇ has elapsed, the automatic shutoff valve 17 is opened, and after time T ₈ elapses, the tank 11 is automatically Shutoff valve 13 is opened to replenish liquid during time _T9 . When the liquid level in the tank 11 reaches HL, the liquid above that level will overflow from the automatic shut-off valve 17, so when the time _T9 has elapsed from the start of opening the automatic shut-off valve 13, the automatic shut-off valve 13 will begin to close. After time _T10 has elapsed, automatic shutoff valves 16 and 17 are closed. When time _T11 has elapsed since the automatic shutoff valve 13 began to close, the cylinder 7 is activated to contract the rod, lift the tank 11, and apply a load to the hopper 1. After time T ₁₂ has elapsed, that is, after time t ₂ has elapsed from the start of the test, a second test load value W _2S is measured during time T ₁₃ and the weighed value W ₂ at that time is read. After the measurement time _T13 has elapsed, the cylinder 7 is actuated to extend the rod and the tank 11 is lowered and placed on the tank mount 12. After the time _T14 elapses, the automatic shutoff valve 17 is opened and the tank 11 is opened for a time _T15 . The liquid in the tank 11 is discharged, and the inspection of the hopper scale is completed after the elapse of time _T16 , that is, at time _tF .

[0010]The measured weight values W ₁ and W ₂ are compared with the inspection load values W _1S and W _2S to calculate the difference between them, and it is determined whether the error is within an allowable range. Determine. If there is a large error such that one or both of the weighed values exceeds the allowable range, the span of the hopper scale may be adjusted, and then the same inspection may be performed again.

[0011] If you program the above steps to automatically perform them, you can automatically perform them remotely. This makes it possible to perform inspections in a consistent manner. In addition, in the above embodiment, the tank 11 Although the explanation has been made assuming that there are two automatic shutoff valves provided on the side, the present invention is not limited to this. For example, between levels HL and LL or below level LL, the automatic shielding 3 or more fixed points, including the inspection load value, with 1 or 2 open valves installed. It is also possible to test with Also, load cell 4 is explained as using a compression type. However, it goes without saying that similar effects can be obtained even if a tensile type is used.

0012

[Effect of the idea]

According to the present invention, a simple inspection of a hopper scale can be carried out at at least two fixed points and at a distance. Since this can be done at intervals, the accuracy of the hopper scale can be maintained reliably. It is also possible to contribute to labor saving.

[Brief explanation of drawings]

FIG. 1 is a side view showing the configuration of an embodiment of the present invention.

FIG. 2 is an enlarged sectional view showing a test weight used in the present invention.

FIG. 3 is a time chart illustrating the operation of the simple inspection device of the present invention.

FIG. 4 is a side view showing a conventional example of a hopper scale.

FIG. 5 is a side view showing a conventional hopper scale inspection device.

FIG. 6 is a characteristic diagram illustrating the relationship between test weight load values and measured values.

[Explanation of symbols]

1 hopper 3 Frame 4 Load cell 6 Support arm 7 cylinder 8A test weight 11 Sealed tank 12 Tank mount 13, 15, 16, 17 automatic shutoff valve 14 Supply pipe

Claims (1)

[Scope of utility model registration request] 1. A device for easily inspecting a hopper scale by suspending an inspection weight from a hopper of the hopper scale via a cylinder, wherein a sealed tank is used for the inspection weight, and an automatic shut-off is installed in the tank. A supply pipe for supplying liquid is connected through a valve, and an automatic shutoff valve for draining the liquid is installed at the bottom of the pipe, and at least two automatic shutoff valves for adjusting the level at different levels are installed on the sides. A simple inspection device for a hopper scale, characterized in that it can be installed.