JPH0760113B2 - Static load inspection device for weighing machine - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention inspects the accuracy of a weighing machine that weighs mixed materials such as water, cement, sand, gravel, and crushed stone, or various raw materials in a ready-mixed concrete manufacturing plant. The present invention relates to a static load inspection device for a weighing machine.

[0002]

2. Description of the Related Art For example, a measuring machine incorporated in a ready-mixed concrete manufacturing plant, a so-called batcher plant, is required to be inspected for its accuracy twice a year by law. For this reason,
Conventionally, a weight shelf is assembled to the weighing hopper each time an inspection is performed, a reference weight of a predetermined weight is loaded on the shelf until a predetermined static load is reached, and the static load applied to the weighing load cell is displayed on the indicator. Thus, the accuracy of the load cell for measurement is inspected.

A method of setting a static load using a hydraulic cylinder instead of the reference weight (Japanese Patent Laid-Open No. 64-47915).
Or a method of rotating a male screw rod screwed with a female screw member by a ratchet mechanism (JP-A-2-32220).
No. publication) is known.

[0004]

However, in the prior art using the reference weight, it is necessary to assemble and disassemble the weight shelves, and the minimum unit weight is 20 kg. Loading 200 pieces on the weight shelf,
The loading and unloading work requires a large number of inspectors, and is extremely heavy labor for inspectors, which is disadvantageous in that it involves danger. Also, in the method using a hydraulic cylinder, it is difficult to quickly set the static load to a desired value due to the nature of the fluid, and it takes time to perform the setting operation, and maintenance such as hydraulic oil leakage inspection is required. Has the disadvantage that is required.

Further, in the method using a female screw member, a male screw rod, a ratchet mechanism, etc., since the female screw member rotates together with the male screw rod, the inspector fixes the female screw member with one hand and the other hand. Therefore, the ratchet mechanism must be operated, workability is poor, inspection time is long, and highly accurate inspection is extremely difficult. Moreover, in any of the conventional techniques, it is impossible to measure an intermediate value in which the numerical value of the minimum unit of the indicator changes, and there is a limit to the inspection accuracy.

The present invention has been made in view of the above-mentioned prior art. Since a desired static load can be set with high accuracy in a short time by a simple operation, a static load for a weighing machine capable of performing highly accurate inspection. An object is to provide an inspection device.

[0007]

Means for Solving the Problems The means of the present invention configured to solve the above-mentioned problems includes a base body having a shaft support portion midway in the height direction and a fixed connection portion on the lower end side, and a shaft. A state in which a male screw portion is provided on the upper side from the middle of the direction, and a lower side is rotatably supported by a shaft supporting portion of the base body in a vertically rotatable manner and a load setting shaft which is vertically movable and non-rotatably engaged with the base body. The load cell for inspection, which is screwed to the male screw part of the load setting shaft, has a lower part connected to the elevating member, has a measuring device connecting part on the upper side, and is electrically connected to a digital indicator. And a ratchet lever provided on the load setting shaft to raise and lower the elevating member to apply a static load to the inspection load cell, and a static load adjusting device for finely adjusting the load applied to the inspection load cell. And the static load adjusting device A worm wheel fitted to the weight setting shaft, a drive shaft support located laterally of the worm wheel, axially supported by the base body, and detachable from and attachable to the worm wheel; A worm that is provided on a supported drive shaft and that removably meshes with the worm wheel, an operation handle that is provided at the shaft end of the drive shaft to rotate the worm, and an integral body with the operation handle. It is composed of a rotating pointer and a scale plate which is fixed to the drive shaft support body so as to face the pointer and has scales provided on the front surface at predetermined intervals.

[0008]

The upper end side of the inspection load cell is connected to the weighing machine to be inspected, and the lower end side of the base is fixed to a fixed mating member such as a floor or a deck. The mesh release lever is operated to release the mesh between the worm wheel and the worm, and the ratchet lever is operated to rotate the load setting shaft in a predetermined way to lower the elevating member and the load on the inspection load cell is close to the desired load. Set the value load. Then, the mesh release lever is operated to mesh the worm wheel with the worm, and the operation handle is rotated to rotate the load setting shaft by a small amount to apply a desired load to the inspection load cell. Read the intermediate value before and after the change of the numerical value of the digital indicator when setting the load from the scale plate and the pointer.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. In the figure, 1 indicates a substrate. The base 1 is a vertical plate 2
And a shaft support plate 3 which is located midway in the longitudinal direction of the vertical plate 2 so as to project horizontally in the front direction and has a shaft insertion hole 3A formed in the center thereof, and which faces the shaft support plate 3. The lower plate 4 protruding forward from the lower end of the vertical plate 2 and having a bolt insertion hole 4A in the center, and a fixing bolt 5 inserted in the bolt insertion hole 4A of the lower plate 4. A planer substantially U-shaped detent guide member 6 located on the upper side of the vertical plate 2 and projecting forward.
The vertical plate 2 has a substantially dog-legged bracket 7 which is located midway in the longitudinal direction and is provided on the back surface so as to protrude. The reinforcing plates 8 and 9 are provided between the shaft support plate 3 and the lower plate 4. They are fixed facing each other.

Reference numeral 10 denotes a load setting shaft which is vertically supported by the base body 1. The load setting shaft 10 is formed with a chamfering engaging portion 10A which is located in the axial direction and has six faces.
A nut threaded portion 10B is formed at the lower end side, and a load setting male screw portion 10C is formed from the middle in the axial direction to the upper side.

The load setting shaft 10 has the shaft support plate 3
And a nut 1 which is rotatably inserted into a shaft insertion hole 3A via a washer 11 and is screwed to a nut screwing portion 10B.
A thrust ball bearing 14 fitted in a bearing holder 13 is fitted between the shaft 2 and the shaft support plate 3.

Reference numeral 15 denotes an elevating member slidably fitted in the rotation preventing guide member 6 of the base body 1. The elevating member 15 has a shaft penetrating portion 16A recessed on the lower side and a bifurcated shape on the upper side. The connecting portion 16B is integrally formed with the elevating body 16, and the screwing member 17 is located inside the shaft intruding portion 16A and is fixed to the elevating body 16 and has a female screw 17A at its center.

Reference numeral 18 denotes an inspection load cell for detecting a tensile load. The load cell 18 is provided with a load cell main body 18A and a connecting portion 16B of the elevating member 15 which is protruded from a lower portion of the load cell main body 18A. The lower eyebolt 18B connected to the load cell body 18A and the upper eyebolt 18C protruding from the upper side of the load cell body 18A are connected to each other. The load cell body 18A has a digital indicator 20 having a summing function via a signal line 19. (See FIG. 7).

Reference numeral 21 denotes a chamfering engagement portion 10A of the load setting shaft 10 for applying a static load to the inspection load cell 18.
2 shows the ratchet lever fitted in the. The ratchet lever 21 includes a ratchet wheel that rotates integrally with the load setting shaft 10 and a ratchet mechanism 21 that engages with the ratchet wheel in a disengageable manner.
The load setting shaft 10 can be rotationally driven in a fixed direction by pushing the lever main body 21B in the direction of the arrow A, which is a publicly known device including an A and a lever main body 21B that rotationally drives the ratchet mechanism 21A. Has become.

Next, reference numeral 22 denotes a static load adjusting device for finely adjusting the static load applied to the inspection load cell 18 by using the ratchet lever 21. 23 is the adjusting device 22
The worm wheel that composes the worm wheel 2
3 is located above the ratchet lever 21 and fitted in the middle of the load setting shaft 10, and the key 24 is used to load the load setting shaft 1.
It is connected so as to rotate with 0. 25 is the base 1
The wheel cover 25 is fixedly attached to the worm wheel 23 and covers the worm wheel 23. The wheel cover 25 has a substantially U-shaped vertical cross section and is open on the front right side.

On the other hand, 26 is a cover main body 26A formed in a substantially inverted U-shaped cross section, flanges 26B and 26C fixed to both ends of the cover main body 26A in the longitudinal direction, and a mounting bracket protruding from the rear flange 26C. 26D shows a worm cover consisting of 26D. The worm cover 26 is located on the right side of the wheel cover 25 and is connected to the bracket 7 of the base body 1 through a pin 27.
It is rotatably supported in the direction of arrow B in FIG.

Numeral 28 is a drive shaft whose axial ends are supported by the worm cover 26 via radial thrust ball bearings 29, 29, and numeral 30 is fitted in the axial middle of the drive shaft 28 and meshes with the worm wheel 23. Indicates a worm.
A pair of sleeves 31, 31 are fitted to the drive shaft 28 at both ends of the worm 30 in the axial direction, and the thrust force acting on the worm 30 is transmitted to the bearings 29, 29. There is. Reference numeral 32 denotes an operation handle for rotationally driving the worm 30 in forward and reverse directions, and the operation handle 32 is attached to the shaft end of the drive shaft 28.

Further, 33 is a worm meshing means for meshing the worm 30 with the worm wheel 23 in a disengageable manner. The worm meshing means 33 is a worm cover 2
6, a support piece 34 protrudingly provided, and an interlocking piece 36 rotatably connected to the support piece 34 via one side support pin 35,
A supporting arm 37 protruding from the reinforcing plate 9 of the base body 1 and rotatably attached to the supporting arm 37 via another side supporting pin 38,
The distal end side is composed of a mesh release lever 40 connected to the interlocking piece 36 via a connection pin 39, and an eccentric spring 41 stretched between the wheel cover 25 and the mesh release lever 40. Then, when the engagement release lever 40 is operated to rotate in the arrow C direction in FIG. 3, the worm cover 26 rotates in the arrow B direction via the interlocking piece 36, and the worm 30 separates from the worm wheel 23. .

Numeral 42 is a graduation 42A, 42 with equal intervals on the front surface.
A scale plate provided with B, 42C, ..., The scale plate 4
Reference numeral 2 is fixed to the front flange 26B of the worm cover 26, and a reading needle 43 that can be fixed by a screw 43A is attached to the outer peripheral edge. Reference numeral 44 is a pointer fixed to the operation handle 32 so as to face the scale plate 42 and rotate integrally.

The apparatus of this embodiment has the above-mentioned configuration, and the accuracy of the inspection equipment is not different from the conventional inspection equipment in that it is pre-verified by using a reference weight at a weighing station or the like. .

Next, the operation of the weighing machine of the batcher plant will be described by taking an example of inspecting the weighing machine of the batcher plant. FIG. 7 shows a part of the batcher plant. 51 in the figure
Is a fixed horizontal beam, and 52, 52, and 52 are three load cells for measurement, which are hung on the fixed horizontal beam 51 on the left and right sides and on one side in a direction orthogonal to the right and left sides, respectively.
Is electrically connected to an indicator 53 installed in an operation room (not shown). 54 is the load cell 52 for measurement,
52, a weighing hopper suspended from the 52, the weighing hopper 5
A pair of brackets 54A, 54A are provided on the upper end side of the protrusion 4. Reference numeral 55 is a deck arranged around the weighing hopper 54.

Now, the measuring load cells 52, 52,
Since at least two inspection devices are used when performing the accuracy inspection of 52, in the following description, the inspection device on the front right side will be referred to as No. 1 device, and the inspection device on the left side will be referred to as No. 2 device.

First, the connection shackle 56, the chain 57 and the like are used to load the inspection load cell 18 of each device into the weighing hopper 5.
4 is connected to the bracket 54A, while the fixing bolt 5 of each base 1 is fixed to the deck 55. Thereafter, the mesh release lever 40 is operated in the direction of arrow C to move the worm wheel 23.
The worm 30 and the worm 30 are disengaged, and the ratchet lever 21 is pushed in a predetermined direction to rotate the load setting shaft 10 so-called rough feed. As a result, the elevating member 15 descends, and eventually the No. 1 and No. 2 devices are stretched between the weighing hopper 54 and the deck 55.

Then, the ratchet lever 21 is further operated to apply a load of, for example, 50 kg to the inspection load cells 18 of the No. 1 and No. 2 devices, and the digital indicator 20 displays the combined load of 100 kg, The displayed numerical value is once set to zero. At this time, the weighing load cell 5
The indicator 53 on the operation room side connected to 2 is also set to zero.

Thereafter, the ratchet lever 21 is operated again to apply a load of 150 kg to the inspection load cell 18 of the No. 1 device, and then a load of 150 kg is similarly applied to the inspection load cell 18 of the No. 2 device. , Digital indicator 2
When the display value of 0 reaches 295 kg, for example, the mesh release lever 40 is operated to move the worm 30 to the worm wheel 2.
Mesh with 3.

Next, the operation handle 32 is rotated to slowly rotate the load setting shaft 10 through the worm 30 and the worm wheel 23 in sequence, while gradually checking the load cell 18 for inspection while observing the display of the digital indicator 20. Apply a load. When the display value reaches 300 kg when the pointer 44 is at the position of the scale 42B as shown in FIG. 6, the reading placement needle 43 is aligned with the position of the scale 42B, and the operation handle 32
When the displayed value reaches 301 kg by rotating the, the position of the pointer 44 (shown by the broken line in FIG. 6) and the reading placement needle 4 at this time
The position intermediate with 3 is read from the scales 42A, 42B, ... And the operating handle 32 is reversely rotated to return the pointer 44 to the intermediate scale. In this state, the display value of the indicator 53 on the operation room side is confirmed.

For the above inspection work, for example, 600 kg, 90
0kg, 1,200kg, ... 3,000kg with different load, and digital indicator 20 for inspection at maximum weighing.
Indicates 3,000 kg, but when the weighing indicator 53 on the operating room side displays a different numerical value, the indicator 53 should be corrected to display 3,000 kg. Thus, the static load inspection of the weighing hopper 54 can be accurately performed.

[0028]

The present invention is as described above in detail, and since the load is finely adjusted by using the worm wheel and the worm, the structure is simple, there is no failure, and maintenance is easy. Can be a small inspection device. In addition, the operation handle is excellent in workability because it can be rotated by simply applying a rotational force that is about 1/1000 of the set load.
Moreover, highly accurate inspection can be performed quickly.

[Brief description of drawings]

FIG. 1 is a front view of a static load inspection device for a weighing machine according to an embodiment of the present invention.

FIG. 2 is a right side view of the example device.

FIG. 3 is an enlarged sectional view taken along the line III-III in FIG.

FIG. 4 is an enlarged vertical cross-sectional view of a main part of the embodiment apparatus.

FIG. 5 is an enlarged transverse cross-sectional view of a main part of the device according to the embodiment.

FIG. 6 is a partially enlarged view of a scale plate and a pointer.

FIG. 7 is an explanatory diagram showing a state in which the apparatus of the embodiment is assembled in a batcher plant.

[Explanation of symbols]

 1 Base Body 3 Shaft Support Plate 5 Fixed Connection Section 10 Load Setting Shaft 10C Load Setting Male Thread Section 15 Elevating Member 18 Inspection Load Cell 20 Digital Indicator 21 Ratchet Lever 22 Static Load Adjusting Device 23 Worm Wheel 26 Worm Cover 28 Drive Shaft 30 Worm 32 operation handle 42 scale plate 44 pointer

Claims (1)

[Claims] 1. A base having a shaft support part midway in the height direction and a fixed connection part on the lower end side, and a male screw part on the upper side from the middle part in the axial direction, and the lower side being the shaft support part of the base body. A load setting shaft rotatably supported in a vertical state, an elevating member screwed to a male screw part of the load setting shaft in a state of being vertically movable and non-rotatably engaged with the base body, and a lower side of the elevating member. A load cell for inspection, which is connected to a member and has a weighing machine connecting portion on the upper side, is electrically connected to a digital indicator, and the lifting member is moved up and down to apply a static load to the load cell for inspection. A ratchet lever provided on the load setting shaft and a static load adjusting device for finely adjusting the load applied to the inspection load cell, and a worm wheel fitted with the static load adjusting device on the load setting shaft. Located on the side of the worm wheel Is provided on the drive shaft supported by the drive shaft supported by the drive shaft support body and supported by the drive shaft support body and supported by the drive shaft support body, and engageably and disengageably engaged with the worm wheel. A worm, an operating handle provided on the shaft end of the drive shaft for rotating the worm, a pointer that rotates integrally with the operating handle, and a handle fixed to the drive shaft support member facing the pointer. For a weighing machine configured with a graduation plate provided with graduations at predetermined intervals on the front surface, and reading an intermediate value in which the numerical value of the minimum unit of the digital indicator changes from the graduation of the graduation plate. Static load inspection device.