JPH0641873B2 - Weighing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Field of Application> The present invention relates to a weighing device, and in particular, a plurality of weighing machines having different maximum weighing values or weighing accuracy can be selectively used for weighing. Regarding a weighing device.

<Prior Art> Conventional weighing machines used in liquids, powders, solids, or a mixture line of these materials have different maximum weighing values (maximum weight measurable range), that is, weighing accuracy (weight measurement). It is desirable that a plurality of products with different accuracy) be prepared. This is because the weighing machine has different reading limits, that is, weighing accuracy corresponding to the maximum weighing value.

For example, the reading limits are 100 g, 10 g, and 1 g for the maximum weighing values of 6000 kg, 600 kg, and 60 kg, respectively.
The reading limit changes by about the same percentage as the maximum weight value.

Therefore, when the amount of the object to be weighed is different, various weighing machines suitable for the expected weighing error are selected and used.

On the other hand, as an example of a supply line for liquid, powder, solid or a mixture thereof using a weighing machine, there is a liquid preparation system as shown in FIG.

This liquid preparation system is used for adjusting the colors of inks, paints, fragrances, cosmetics, general chemicals, etc. Various stock solutions stored in a plurality of stock solution tanks 1 are dispensed from a dispenser unit 2 onto a weighing machine 3. The container 4 which is the object to be weighed and placed and supported is discharged and supplied to the control unit 5
The reading of the weighing machine 3 is fed back to the dispenser unit 2 to control the discharge of the liquid so as to obtain a high weighing accuracy.

In such a system, various color adjustments and blending as described above are performed on the same pass line, so that the amount of the object to be weighed is different each time. Therefore, as mentioned above,
Various weighing machines suitable for the expected weighing error are selected and used.

<Problems to be Solved by the Invention> In this case, conventionally, as shown in FIG. 8, weighing machines 6 and 7 having different maximum and small weighing values or weighing accuracy are separately installed, and selected and used. I have to. In this case, the containers 8 and 9 are carried in manually into the weighing machines 6 and 7,
I try to carry it out. Of course, it is also possible to carry the containers 8 and 9 into the weighing machines 6 and 7 via a conveyor or the like, and to carry out the containers 8 and 9 from the weighing machines 6 and 7 to a desired location, but the containers can be automated. It is difficult to accurately mount 8 and 9 on the center of the weighing machines 6 and 7 or to mount them on the conveyor.

Further, even if the automation can be completed completely, a complicated mechanism is required, and it is necessary to separately provide a transport system for the weighing machines 6 and 7 having different maximum weighing values or weighing precisions. Inevitable.

Further, conventionally, as shown in FIG. 9, the weighing machine is also replaced.

In this method, a weighing machine 12 having a small maximum weighing value or a high weighing accuracy (hereinafter, referred to as a small weight) is mounted on a supporting table 11 capable of traveling on the rail 10, and the supporting table 11 is run. The maximum weighing value is large or the weighing accuracy is low (hereinafter, these are referred to as heavy weight) weighing machine 13
By arranging the weighing machine 12 to be moved and placed on the upper surface of, the two weighing machines 12 and 13 can be selectively used in one system.

However, in this method, the weighing machine 1 for small weight with high accuracy is used.
Since 2 is forcibly moved and placed on the weighing machine 13 for large weights each time, the installation state of the weighing machine 12 of the support base 11 is not constant, and the weighing accuracy is increased due to instability of installation or vibration. Cause trouble. Furthermore, the weighing machine 12 for small weight
Only the moving machine and the weighing machine 12 for small weights and the weighing machine 13 for large weights have level differences in installation position, so that automation is more difficult than the method described in FIG.

Therefore, in view of the above conventional problems, the present invention is capable of continuously performing weighing when selecting and using various weighing machines that match the expected maximum weighing value or weighing error in advance, and automation is also possible. An object is to provide a weighing device that can be easily performed.

<Means for Solving the Problems> Therefore, in the weighing device of the first invention, a plurality of weighing machines having different maximum weighing values or weighing accuracy are stacked from bottom to top in descending order of maximum weighing value or in descending order of weighing accuracy. And a plurality of placing members that are provided above the stacked weighing machines in parallel with each other at predetermined intervals in parallel with each other and extend upward and are movable up and down. A weighing table for placing and supporting, and a supporting surface that is installed above the stacked weighing machines and that supports and places the objects to be weighed on standby above the weighing machines, and the supporting surface constitutes the weighing table. A roller conveyor type supporting means movable up and down so as to be selectively positioned above or below the weighing object mounting support surface of the mounting member, wherein each roller is placed in a gap between the rollers. Mounting member can be inserted A roller conveyor type supporting means arranged as described above, and a support which is attached to the roller conveyor type supporting means so as to be movable integrally with the supporting means, and which supports the weighing table from below in a state where the supporting means moves upward. An arm, elevating means for elevating and lowering the roller conveyor type supporting means, and a plurality of arms provided corresponding to each of the weighing machines, and between the lower surface of the weighing table and the upper surface of each of the weighing machines when supporting an object to be weighed by a weighing table. An intervening spacer is included, and a spacer corresponding to a weighing machine other than the weighing machine at the bottom of the plurality of weighing machines is provided between the lower surface of the weighing table and the upper surface of the weighing machine. It is configured to be selectively moved to the retracted position.

Further, the weighing device of the second aspect of the invention is configured to include a spring that supports the weighing table above the weighing machine at the uppermost stage, instead of the support arm of the weighing device.

<Operation> In the first invention, first, the roller conveyor type supporting means is set in the raised position.

At this time, the support arm is in a state of supporting the weighing table.

Then, in a state where the object to be weighed is placed and supported on the roller conveyor type supporting means at a position corresponding to the weighing object placing and supporting surface of the weighing table, the elevating means is driven to descend the roller conveyor type supporting means. Move to position.

As the roller conveyor type supporting means descends, the weighing platform also descends, and the weighing platform is supported in contact with a spacer interposed between the lower surface of the weighing platform and the upper surface of each weighing machine. Then, the object to be weighed down together with the roller conveyor type supporting means comes into contact with the weighing table. That is, the supporting state of the weighing platform by the support arm is released, and instead the weighing platform shifts to the state of being supported by the spacer, and at the same time, the placement support state of the weighing object by the roller conveyor type supporting means is released, and the weighing platform is released. The object moves to a state where it is placed and supported by the weighing table.

Therefore, the load of the object to be weighed is applied to the weighing machine via the weighing platform and the spacer. That is, even when weighing is performed by a weighing machine other than the weighing machine at the uppermost stage, the weighing machine for small weight mounted on the weighing machine for measurement does not receive a load, and therefore the weighing machine for small weight is used. It is possible to weigh with a weighing machine without damaging it.

Next, when the weighing object is a container and another weighing object such as a liquid, a powder, a solid or a mixture thereof is charged into the container during weighing, the weighing object is The weighing is started by the weighing machine before or after the tare weight is erased or allowed to be erased before the weighing is started.

When the weighing value reaches a predetermined value and the input of the object to be weighed is stopped, the elevating means moves the roller conveyor type supporting means to the raised position. As a result, the supporting arm again comes into contact with the lower surface of the weighing table to move the weighing table upward, the container moves upward, and the supporting state of the container placed by the weighing table is released, and the container is again supported by the roller conveyor. It shifts to a state of being placed and supported by the means.

When not measuring the object to be weighed into the container during weighing and simply measuring the object to be weighed that has already been put into the container or directly using the container, before and after this weighing operation Is weighed without placing the object to be weighed on
Measure the tare weight applied to the weighing machine such as the weighing platform and the spacer, and subtract the tare weight to obtain the weight.

In the second aspect of the invention, first, with the roller conveyor type supporting means set in the raised position, the weighing platform is supported by the weighing machine via the spring.

Then, in a state where the object to be weighed is placed and supported on the roller conveyor type supporting means at a position corresponding to the weighing object placing and supporting surface of the weighing table, the elevating means is driven to descend the roller conveyor type supporting means. Move to position.

When the roller conveyor type support means moves to the lowered position,
The state in which the object to be weighed is placed and supported by the supporting means is released, and the object to be weighed shifts to the state in which it is placed and supported by the weighing platform. This causes the spring to flex significantly,
The weighing platform moves downward to come into contact with the upper surface of the spacer, and is stably supported by the spacer.

Therefore, most of the weight of the object to be weighed is applied to the weighing machine via the weighing platform and the spacer, and the rest is applied via the spring. That is, even when the weighing is performed by a weighing machine other than the uppermost weighing machine, most of the load is applied to the weighing machine performing the measurement through the spacer, and the remaining slight load is applied to the spring and the weighing machine. Since all the loads are applied to the weighing machine for measurement through the placed weighing machine for small weight, the weighing machine for small weight receives only a small load. It is possible to weigh with a weighing machine without damaging it.

When the weighing is completed, the roller conveyor type supporting means is moved to the raised position. By the rise of the roller conveyor type supporting means, the supporting means contacts the bottom surface of the object to be weighed,
Since the state of placing and supporting the object to be weighed is shifted and the state of placing and supporting the object to be weighed by the weighing table is released, the weighing table is pushed upward by the spring force of the spring and separated from the spacer, Transition to the state of. The procedure for deleting the tare weight is the same as in the first invention.

According to the weighing device having such a configuration, it is possible to selectively perform weighing with a plurality of weighing machines having different maximum weighing values or weighing accuracy with one device, and it is possible to match an error in weighing that is expected in advance on the same pass line or the like. When various weighing machines to be used are selected and used, it is possible to continuously weigh with the various weighing machines.

<Example> Hereinafter, an example of the present invention is described based on a drawing.

In FIG. 1 showing an embodiment of the first invention and FIG. 2 schematically showing the apparatus of this embodiment, a weighing machine 15 for large weight is installed on an installation surface 14, and an upper surface (weighing machine 15) of the weighing machine 15 is installed. A weighing machine 16 for small weight is installed in the center of the surface. The main bodies of these weighing machines 15 and 16 are formed in a flat rectangular shape, and the outer surface parallel to the installation surface 14 of the main body of the weighing machine 15 for heavy weight has the main body of the weighing machine 16 for small weight. It is formed larger than that. These weighing machines 1
A force balance type of 5 and 16 can be preferably used, and for example, only electronic stands are commercially available from METTLER, SAUTER, SAUTERUS and the like.

Above the stacked weighing machines 15 and 16, a weighing platform 1 for mounting and supporting various containers 17 and 18 as objects to be weighed.
9 is arranged to be movable up and down.

In this weighing platform 19, four plates 19a whose plate surfaces extend at right angles to the installation surface 14 are assembled in a square shape, and three plates 19b are arranged between a pair of plates 19a facing each other. The plate 19a is connected to the frame 19A in parallel with each other at a predetermined interval and extends vertically at a right angle to the installation surface 14, and the lower end thereof is inserted inside the frame 19A. A plurality of plate-shaped members (mounting members) 19B joined together
And consists of. Each plate-shaped member 19B is provided with a plurality of openings 19c at the upper and lower intermediate positions of the plate member surface, and a cover 20 is placed on the upper end of each plate-shaped member 19B. The containers 17 and 18 are placed and supported. Further, the plates 19a and 19b of the frame 19A have a concave shape in the vicinity of the roller 22 so as not to come into contact with the outermost peripheral surface of the roller 22 of the roller conveyor 21 even when the roller conveyor 21 described later moves to the lower position. Has become.

The container 17 is provided above the weighing machines 15 and 16 which are stacked, and has a support surface on which the containers 17 and 18 are placed and supported so as to stand by above the weighing machines 15 and 16. The support surface is the container 17 of the weighing table 19. , 18 is provided with a roller conveyor type supporting means movable up and down so as to be selectively positioned above or below the mounting support surface. The roller conveyor 21 includes a large number of rollers 22 arranged in parallel at predetermined intervals, and a rotary drive shaft 23 of the rollers 22.
Is rotatably supported by frame bodies 24 provided on both sides of the rotary drive shaft 23. A sprocket (not shown) is attached to the end of each roller 22, and a chain (not shown) is wound around each sprocket. Then, the roller 22 located at one end is rotationally driven by a driving device such as a motor, so that the other rollers 22 are also rotationally driven in synchronism with each other by transmitting the rotational driving force via the sprocket and the chain. ing.

In the roller conveyor 21, the direction of the rotation drive shaft 23 of the roller 22 matches the surface direction of the plate-shaped member 19B of the weighing platform 19, and the plate-shaped members 19B are provided in the gaps between the rollers 22.
Are arranged so that they can be inserted. In this case, each roller 2
It is set so that the pitch between the two and the pitch between the plate-shaped members 19B are the same.

Then, the roller conveyor 21 includes the roller conveyor 2
1 is attached so as to be movable integrally with the roller conveyor 21.
A supporting arm 25 for supporting the weighing table 19 from the lower side when moving upward is attached.

Four support arms 25 are prepared, each of which has a short side 2
5a and the long side portion 25b are formed in a substantially L shape. The support arms 25 are arranged at two positions spaced apart from each other in the longitudinal direction of the pair of frame bodies 24 of the roller conveyor 21, and the short side portions 25a are fixed to the bottom surface of the frame body 24 of the roller conveyor 21, respectively, and the long side portions thereof. 25b is the weighing table 1
It extends in the direction of the lower surface of 9 and can contact the lower surface of the weighing table 19.

Further, an elevating means for elevating the roller conveyor 21 is provided.

In this embodiment, the lifting means is composed of four cylinders 26 that support the frame 24 of the roller conveyor 21.

Each of the cylinders 26 is provided with a piston 26b slidably in a cylinder body 26a, and oil or air is controlled to flow in and out of two chambers in the cylinder body 26a partitioned by the piston 26b, so that the piston 26b is hydraulically or pneumatically controlled. The piston rod 26c is slid by sliding.

The base end portion of each cylinder body 26a is erected on the installation surface 14, and the tip end portion of each piston rod 26c is connected to the lower surface of the front and rear end portions of the pair of frame bodies 24 of the roller conveyor 21.

The frame 24 slides, that is, moves up and down by the piston rod 25c so that the supporting surface of the roller conveyor type supporting means, that is, the uppermost outer peripheral surface of each roller 22 is more than the supporting surface on which the containers 17, 18 of the plate member 19B are mounted. Is also moved up and down so as to be selectively positioned above or below. That is, when each roller 22 is in the upper position, the containers 17, 1
8 is supported by the roller 22, and when the roller 22 is at the lower position, the containers 17 and 18 are moved up and down so as to be supported by the plate member 19B.

In addition, the movement control of the roller conveyor 21 to the ascending position and the descending position by the cylinder 26 is performed by the limit switch 27 for detecting the ascending position and the limit switch 28 for detecting the descending position, which are arranged in the movement path of the frame 24. The detection signal is sent to the drive control device of the cylinder 26.

Further, a plurality of spacers 29 are provided corresponding to the weighing machines 15 and 16 and are selectively interposed between the lower surface of the weighing table 19 and the upper surfaces of the weighing machines 15 and 16 when the container is supported by the weighing table 19. , 30 are provided.

Spacer 29 provided corresponding to a weighing machine for heavy weight
Is a fixed spacer, and is composed of an attachment portion 29a fixedly attached to the upper surface of the weighing machine 15 by a fixture, and a support portion 29b fixed to the inside of the tip of the attachment portion 29a so as to be vertically movable. It Four such spacers 29 are prepared, and are set at the left and right intermediate positions of the front and rear ends and the front and rear intermediate positions of the left and right ends of the upper surface of the weighing machine 15 in FIG. 1 (a).

On the other hand, the spacer 30 provided corresponding to the weighing machine 16 for small weight selectively moves to a position interposed between the lower surface of the weighing table 19 and the upper surface of the weighing machine 16 at the uppermost stage and a retracted position. This is a movable spacer having the above-mentioned configuration, and is configured as shown in FIGS. 3 and 4. In these drawings, the spacer 30 is rotatably supported by the mounting portion 30a fixedly mounted on the side surface of the weighing machine 16 by a fixture, the bearing portion 30b provided on the mounting portion 30a, and the bearing portion 30b. And a supporting portion 30c. That is,
A rotating shaft 30d extending vertically is supported by the bearing portion 30b. At the upper end of the rotating shaft 30d, a supporting portion 30 made of a rod-shaped member having a substantially T-shaped vertical section is formed.
One end of c is fixed. The support portion 30c is constantly urged in the upward direction by a spring 30e interposed between the lower surface of the support portion 30c and the upper surface of the bearing portion 30b. Support part 3
0c indicates a position extending to the upper surface of the weighing machine 16 and the weighing machine 16
A position extending from the upper surface and extending parallel to the side surface of the weighing machine 16,
Can be selectively rotated.

Four such spacers 30 are prepared, and are installed at two spaced positions on both side surfaces parallel to the container conveying direction by the roller conveyor 21 of the weighing machine 16.

The upper surface heights of the supporting portion 30c of the spacer 30 and the supporting portion 29b of the spacer 29 are both higher than the upper surface of the weighing machine 16, and the supporting portion 30c of the spacer 30 is located in the weighing machine 1.
6 When reaching the position extending to the upper surface, the lower surface of the weighing table 19 is in contact with only the supporting portion 30c but not the supporting portion 29b of the spacer 29 when the container is supported by the weighing table 19.

The rotation of the support portion 30c is performed by the pressure of the compressed air blown onto the support portion 30c, and the support portion 30c has two vanes 31, 32 for receiving the pressure of the compressed air. Is fixedly attached. One of the vanes 32 is a plate-shaped member that extends in the opposite direction to the supporting portion 30c along the surface of the supporting portion 30c in the extending direction. The other vane 31 is made of a plate-shaped member extending along a surface orthogonal to the surface in the extending direction of the support portion 30c. These vanes 3
Stoppers 31a and 32a for positioning and locking the support portion 30c at the respective rotational positions are attached to 1 and 32, respectively. These stoppers 31a and 32a are pin-shaped members penetratingly attached to the vanes 31 and 32.

A contact member 33 is joined to each of the lower surfaces of the weighing platform 19 at which the spacers 29 and 30 come into contact with each other.

Here, the compressed air supply device for rotating the support portion 30c will be described. Both sides of the vane 31 when the support portion 30c is in a position extending from the upper surface of the weighing machine 16 and extending parallel to the side surface of the weighing machine 16 will be described. Discharge nozzles 34 and 35 for compressed air are arranged at positions facing each other. The one discharge nozzle 35 discharges compressed air for rotating the vane 31 to the position where the support portion 30c extends to the upper surface of the weighing machine 16 as much as possible, and the other discharge nozzle 34.
Is for discharging compressed air for rotating the vane 32 to a position where the support portion 30c deviates from the upper surface of the weighing machine 16 as much as possible. Piping 36a from compressed air supply source 36
Is connected to the inlet port of a switching valve 37 that supplies and stops compressed air, and the outlet port of the switching valve 37 is connected to the inlet port of a switching valve 38 that switches the supply of compressed air to the discharge nozzles 34, 35. This switching valve 3
The 8 outlet ports are connected to the discharge nozzles 34 and 35, respectively, via pipes 38a and 38b.

A non-contact type that is provided with a pair of sensor portions for detecting the rotational position of the support portion 30c at the positions near the tips of the vanes 31 and 32 when the support portion 30c comes to a position where it comes off the upper surface of the weighing machine 16. Position sensors 39 and 40 are installed respectively. These position sensors 39 and 40 are adapted to output position detection signals when the plate member 41 attached to the tip of the vane 32 is positioned at each sensor position.

A slide guide 42 that guides the vertical movement of the weighing table 19 is attached to the weighing machine 16 for small weights. Four slide guides are prepared and fixedly attached to both side surfaces of the weighing machine 16 which are orthogonal to the container transport direction.

That is, the slide guide 42 includes a fixing portion 42a fixed to the side surface of the weighing machine 16 by a fixing tool and the fixing portion 4a.
2a, a substantially U-shaped frame portion 42b horizontally extending to a lower position in the vicinity of a corner portion of the weighing platform 19, and a corner portion of the weighing platform 19 extending upward from an upper edge of a tip portion of the frame portion 42b. And a guide portion 42c facing the side surface.
Pads 43 made of Teflon are fixed to the inner surface of the guide portion 42c and the adjacent side surfaces of the corner portion, respectively.

A fixed roller conveyor 44 (not shown) for transporting the containers 17 and 18 to the roller conveyor 21 is arranged in front of the roller conveyor 21.

Next, the weighing operation of the weighing device having such a configuration will be described.

In order to clarify the operation of each part, this explanation will be given with reference to FIG. 2 schematically showing the apparatus of FIG. However, in order to make the movement of the support arm 25 easy to understand, the position of the support arm 25 shown in FIG. 1 is written at a position rotated by 180 degrees on the plane from the correct position shown in FIG. is there.

First, the weighing operation by the weighing machine 15 for heavy weight will be described.

As shown in FIG. 2 (a), the roller conveyor 21 is set to the above-mentioned raised position. In this case, the height level of the roller conveyor 21 is the same as that of the fixed roller conveyor 44. At this time, the support arm 25 is in a state of supporting the weighing platform 19.

Then, the container 17 is placed on the fixed roller conveyor 44, and the roller conveyor 44 and the roller conveyor 21 are driven. In this case, both the roller conveyors 44 and 21 are not driven unless the limit switch 27 detects the raised position of the roller conveyor 21.

When the container 17 reaches a position on the roller conveyor 21 that matches the container support surface of the weighing platform 19, a container detection means such as a photoelectric tube (not shown) detects this and stops driving the roller conveyors 44, 21.

Next, when the position sensor 40 confirms that the support portion 30c of the spacer 30 is located off the upper surface of the weighing machine 16 as shown in FIG. 3 (a), as shown in FIG. 2 (b). , The cylinder 26 is driven to move the piston rod 26c downward, and the roller conveyor 21 is moved to the above-described lowered position.

When the roller conveyor 21 moves to the lowered position, the limit switch 28 detects this and the driving of the cylinder 26 is stopped. With the lowering of the roller conveyor 21, the weighing platform 19 also descends, and the weighing platform 19 moves toward the spacer 29.
Touch. Next, the container 17 descended together with the roller conveyor 21 comes into contact with the upper end of the plate-shaped member 19B of the weighing platform 19. That is, the support state of the weighing platform 19 by the support arm 25 is released, and instead, the weighing platform 19 is replaced by the spacer 29.
Simultaneously with the transition to the state of being supported by, the placement support state of the container 17 by the roller conveyor 21 is released,
The container 17 moves to a state where it is placed and supported by the weighing table 19.

Therefore, the load of the container 17 is applied to the weighing machine 15 via the weighing platform 19 and the spacer 29.

That is, the weighing machine 15 for heavy weight can perform weighing.

Next, when an object to be weighed such as liquid, powder, solid or a mixture thereof is put into the container 17, the weighing by the weighing machine 15 is started. A weighing detection signal (not shown) is output from the weighing machine 15 to the control device, and when a predetermined weighing is detected, the loading of the object to be weighed is stopped based on this signal.

In addition, the weight of the weighing platform 19, the spacer 29, the weighing machine 16 for small weights, and the container 17 is added to the weighing machine 15, which is automatically initialized by the control device to which the weighing detection signal is input. It can be set and erased, that is, it can be automatically tare erased.

When the loading of the object to be weighed is stopped, the cylinder 26 is driven to move the piston rod 26c upward, and the roller conveyor 2
1 is moved to the above-mentioned raised position. When the limit switch 27 detects the movement to the raised position, the drive of the cylinder 26 is stopped. Such roller conveyor 21
As a result, the supporting state of the container 17 placed on the weighing table 19 is released, the container 17 moves to the state of being placed and supported by the roller conveyor 21 again, and the supporting arm 25 again contacts the lower surface of the weighing table 19. The weighing platform 19 moves upward.

Then, the roller conveyor 21 and the fixed roller conveyor 4
4 and drive the container 17 to a predetermined position on the roller conveyor 44, a container detecting means such as a photoelectric tube (not shown) detects this and stops driving the roller conveyors 21 and 44.

Next, the weighing operation of the weighing machine 16 for small weights will be described.

From the setting of the roller conveyor 21 to the above-described raised position, until the container 17 is detected on the roller conveyor 21 and the driving of the roller conveyors 44 and 21 is stopped, the weighing operation by the weighing machine 15 for large weight is the same. Is.

After the above operation, as shown in FIG. 4 (a), the switching valve 3
When 8 is turned on and then the switching valve 37 is turned on,
Compressed air is supplied from the compressed air supply source 36 to the discharge nozzle 35 through the pipe 38b, and the vane 31 of the spacer 30 at the position shown in FIG.
Compressed air is blown out toward. As a result, a pressure is applied to the vane 31 to rotate the support portion 30c from the position shown in FIG. 3 to the position shown in FIG. Support part 30c
Stops when the stopper 31a comes into contact with the side surface of the weighing machine 16 and reaches a position extending to the upper surface of the weighing machine 16, which is detected by the position sensor 39.

The movement of the spacer 30 is not performed unless the limit switch 27 detects the raised position of the roller conveyor 21.

Next, when the position sensor 39 confirms the position of the support portion 30c, as shown in FIG. 2 (c), the cylinder 26 is driven to move the piston rod 26c downward, and the roller conveyor 21 is moved to the above-described lowered position. Moving.

When the limit switch 28 detects the movement to the lowered position, the cylinder 26 is stopped from being driven, the switching valves 37 and 38 are turned off, and the supply of compressed air is stopped.

As the roller conveyor 21 descends, the weighing platform 19
Is also lowered, and the weighing platform 19 supports the support portion 30c of the spacer 30.
Touch. Next, the container 18 descended together with the roller conveyor 21 comes into contact with the upper end of the plate-shaped member 19B of the weighing platform 19. That is, the supporting state of the weighing platform 19 by the support arm 25 is released, and instead, the weighing platform 19 is replaced by the spacer 30.
At the same time when the state is changed to the state where the container 18 is supported by the roller conveyor 21,
The container 18 moves to a state where it is placed and supported by the weighing table 19. Therefore, the load of the container 18 is applied to the weighing machine 16 via the weighing platform 19 and the spacer 30. That is, it becomes possible to weigh with the weighing machine 16 for small weights.

Next, weighing is performed in the same manner as the weighing operation by the weighing machine 15 for large weight.

The weight of the weighing platform 19, the spacer 30 and the container 18 is added to the weighing machine 16, and the tare is automatically erased in the same manner.

When the weighing of the object to be weighed is completed, the cylinder 26 is driven to move the piston rod 26c upward, and the roller conveyor 21
Is moved to the above-mentioned raised position. When the limit switch 27 detects the movement to the raised position, the drive of the cylinder 26 is stopped. As the roller conveyor 21 is lifted, the state in which the container 18 is placed and supported by the weighing table 19 is released, the container 18 is transferred to the state in which it is placed and supported by the roller conveyor 21, and the support arm 25 is again moved to the weighing table 19. The weighing table 19 moves up by contacting the lower surface. Simultaneously with the above-described upward movement of the roller conveyor 21, as shown in FIG. 3 (a), when the switching valve 38 is turned off and the switching valve 37 is turned on, compressed air is supplied from the compressed air supply source 36 to the pipe. 38a, the compressed air is supplied to the discharge nozzle 34, and the compressed air is blown from the discharge nozzle 34 toward the vane 32 at the position shown in FIG. As a result, a pressure is applied to the vane 32, and the spacer is rotated from the position shown in FIG. 4 to the position shown in FIG. The support portion 30c is stopped by the stopper 32a coming into contact with the side surface of the weighing machine 16, and comes to a position in which it is separated from the upper surface of the weighing machine 16 and extends parallel to the side surface of the weighing machine 16. When the roller conveyor 21 is in the raised position, the switching valve 37 is turned off.
The FF is performed and the supply of compressed air is stopped.

Then, similarly, the roller conveyor 21 and the fixed roller conveyor 44 are driven so that the container 18 moves to the roller conveyor 44.
When it reaches the above predetermined position, a container detecting means such as a photoelectric tube (not shown) detects this and stops the driving of the roller conveyors 21 and 44.

Next, an example of the second invention will be described.

The second aspect of the invention has a structure in which a spring for supporting the weighing platform 19 on the uppermost weighing machine 16 is provided in place of the support arm 25 of the weighing apparatus of the first aspect of the invention described above, and other portions are generally the first aspect. This is the same as the embodiment shown in FIGS.

Therefore, in the following description, the same elements as those in FIGS. 1 and 2 are designated by the same reference numerals, and the description thereof will be omitted. Only the parts different from the embodiment of FIGS. 1 and 2 will be described.

5 and 6, the weighing platform 45 of this embodiment is shown.
Is composed of a plurality of plates 45a each having a plate surface extending at right angles above the installation surface 14 in a substantially rectangular shape, and the plurality of plates 45b are arranged between the pair of plates 45a facing each other. Board 4
A plurality of frame members 45A having a structure in which 5a are connected to each other are arranged in parallel at a predetermined interval and extend upward at right angles to the installation surface, and the lower end portions thereof are inserted into the inside of the frame member 45A and joined. And a plate-shaped member (mounting member) 45B.

Then, four of the above-mentioned springs, in the present embodiment, four coil springs 46 are prepared and mounted as follows.

That is, the lower spring receiving members 47 are fixedly attached to both ends of both sides of the weighing machine 16 parallel to the container conveying direction by the roller conveyor 21. An end of the coil spring 46 is fitted on the upper surface of the bottom wall of the lower spring receiving member 47 so that the projection 4 is positioned and set.
7a is formed.

On the other hand, upper spring receiving members 48 are fixedly attached to the lower surfaces of the four corners of the weighing platform 45.

On the lower surface of the top wall of the upper spring receiving member 48, there is formed a convex portion 48a in which the end portion of the coil spring 46 is fitted and positioned and set.

The coil spring 46 is inserted between the upper and lower spring receiving members 47 and 48, and the upper and lower ends thereof are respectively the protrusions 4
7a and 48a are fitted and positioned and set.

In this embodiment, eight fixed spacers 29 are prepared, and the front and rear end portions of the upper surface of the weighing machine 15 are spaced apart from each other.
It is installed in two positions apart from each other and the left and right ends.

On the other hand, the movable spacer 30 is installed at a position substantially similar to that of the embodiment shown in FIGS. 1 and 2.

The rotating structure of the support portion 30a of the spacer 30 is the same as that of the embodiment shown in FIGS. 1 and 2.

The slide guides 49 for guiding the vertical movement of the weighing platform 45 are fixedly attached to both side surfaces of the weighing machine 16 which face each other in the direction orthogonal to the container transport direction.

That is, the slide guide 49 includes a fixing portion 49a fixed to the side surface of the weighing machine 16 by a fixing tool and the fixing portion 4a.
9a, a plate-like portion 49b extending horizontally to a lower position in the vicinity of a corner portion of the weighing platform 45, extending upward from the tip of the plate-shaped portion 49b, and facing an adjacent side surface of the corner portion of the weighing platform 45. And a guide portion 49c. Pads 50 made of Teflon are fixed to the inner surface of the guide portion 49c and the adjacent side surfaces of the corner portion.

Next, the weighing operation of the weighing device having such a configuration will be described.

In order to clarify the operation of each part, this description will be given with reference to FIG. 6 which schematically shows the device of FIG.

First, the weighing operation by the weighing machine 15 for heavy weight will be described.

As shown in FIG. 6 (a), the weighing platform 45 is supported by the weighing machine 15 via the coil spring 46 when the roller conveyor 21 is set to the above-described raised position.

Then, after the container 17 comes to a position on the roller conveyor 21 that matches the container support surface of the weighing platform 45 and the driving of the roller conveyors 44 and 21 is stopped, the cylinder 26
To move the piston rod 26c downward to move the roller conveyor 21 to the lowered position.

As shown in FIG. 6 (b), when the roller conveyor 21 is moved to the lowered position, the container 17 by the roller conveyor 21 is moved.
The mounting and supporting state of 1 is released, and the container 17 shifts to the state of being mounted and supported by the weighing platform 45. by this,
The coil spring 46 largely bends, and the weighing platform 45 moves downward to come into contact with the upper surface of the spacer 29 and be supported by the spacer 29. Therefore, most of the load of the container 17 is applied to the weighing machine 15 via the weighing platform 45 and the spacer 29, and the rest is applied to the weighing machine 15 via the coil spring 46 and the weighing machine 16 for small weight. That is, the weighing machine 15 for heavy weight can perform weighing.

The weighing machine 45 is added with the weighing table 45, the spacer 29, the weighing machine 15 for small weight, the spring load of the coil spring 46 and the weight of the container 17, which is a control for inputting a weighing detection signal. The device is designed so that it can be automatically initialized and erased, that is, it can be automatically tare erased.

When the feeding of the object to be weighed is stopped, the roller conveyor 21
Move to the raised position. As the roller conveyor 21 rises, the roller conveyor 21 comes into contact with the bottom surface of the container 17 and moves to a state where the container is placed and supported.
Since the state in which the container 17 is placed and supported by 5 is released, the weighing table 45 is pushed upward by the spring force of the coil spring 46 and separated from the spacer 29, and shifts to the initial state. After that, the roller conveyor 21 and the fixed roller conveyor 44 are driven to carry out the container 17.

The weighing operation by the weighing machine 16 for small weights is performed by moving the roller conveyor 21 to the lowered position and releasing the mounting support state of the container 18 by the roller conveyor 21, so that the container 18 is placed by the weighing platform 45. Until the state in which the coil spring 46 is placed and supported is the same as the weighing operation by the above-described weighing machine 15 for heavy weight, after that, as shown in FIG. Then, the weighing platform 45 is rotated to a position where it comes into contact with the upper surface of the weighing machine 16.
It is in contact with the upper surface of the support part 30c of 0 and is in a state of being supported by the support part 30c. Therefore, all the load of the container 18 is applied to the weighing machine 16 via the weighing platform 45, the spacer 30 and the coil spring 46. That is, it becomes possible to weigh with the weighing machine 16 for small weights.

The weighing machine 45 is added with the weighing table 45, the spacer 30, the spring load of the coil spring 46 and the weight of the container 18, which can be automatically tare erased.

After the object to be weighed is stopped, the roller conveyor 2
1 moves to the raised position, and similarly, the weighing platform 45 is pushed upward by the spring force of the coil spring 46 to separate from the spacer 30, and shifts to the initial state.

According to the weighing device of each of the embodiments described above, one device can selectively perform the weighing with the weighing machine 15 for large weight and the weighing with the weighing machine 16 for small weight.

Therefore, in the liquid preparation system as shown in FIG. 2, when various weighing machines suitable for the expected weighing error are selected and used, it is possible to continuously weigh with various weighing machines. Since it is not necessary to separately provide a transport system for large and small weighing machines with different maximum weighing values or weighing accuracy, it is possible to prevent the equipment from becoming complicated and the weighing machine can be installed in a constant state at all times. Never come.

Further, the containers 17 and 18 can be accurately placed on the weighing machines 15 and 16 by moving the roller conveyor 21 up and down, or placed on the roller conveyor 21, and no complicated mechanism is required. In particular, as shown in this example,
A roller conveyor 21 is used as a means for supporting the containers 17 and 18.
As a result of applying, the loading and unloading of the containers 17 and 18 can be easily automated.

In that case, it is needless to say that the fixed roller conveyor 44 may be dedicated to carry-in by providing a carry-out conveyor for carrying out the objects to be weighed such as the containers 17 and 18 from the roller conveyor 21 at one end.

Further, in the above-mentioned embodiment, two kinds of weighing machines 15 and 16 for small weight and large weight are stacked so that two kinds of weighing can be performed. However, the maximum weighing value or the weighing accuracy is different.
It is also possible to arrange the weighing machines of four kinds, four kinds, etc. in a descending order of the maximum weighing value or in an ascending order of weighing accuracy.

In addition, the plate-shaped members 19B and 45B are used as the weighing platforms 19 and 45.
The cylinders 25 are used as the lifting means, but the invention is not limited to these embodiments.

Further, the structure of moving or fixing the spacer, the form, the operating means and the like are not limited to those in the embodiment, and the point is that a plurality of spacers are provided corresponding to each weighing machine, and the lower surface of the weighing table is supported when the weighing object is supported by the weighing table. And the upper surface of each of the weighing machines,
The spacers corresponding to the weighing machines other than the lowermost one may be configured to be selectively moved to a position interposed between the lower surface of the weighing table and the upper surface of the weighing machine and a retracted position.

Further, in the above embodiment, an example is shown in which the objects to be weighed are put into containers of different sizes, but if the container can be placed on a weighing platform, the size is particularly limited. Of course, if the object to be weighed is a solid or the like, it may be directly weighed without using a container. In this case, the weight of the object to be weighed may be obtained by measuring the tare weight applied to the measuring and weighing machine such as a weighing platform and a spacer without placing the object to be weighed, and subtracting the tare weight.

<Effects of the Invention> As described above, according to the weighing device of the present invention,
From bottom to top The maximum weighing value or the weighing machine that weighs the objects to be weighed by the roller conveyor type supporting means installed above a plurality of weighing machines with different weighing accuracy that are stacked in descending order By standing by above the machine and lowering this roller conveyor type supporting means, it is normally supported by a supporting arm provided on the supporting means, or supported above the weighing machine at the uppermost stage via a spring, and in parallel. An object to be weighed is placed and supported on a weighing table configured to include placing members arranged in parallel, and a plurality of weighing tables are provided corresponding to each weighing machine. The object to be weighed is weighed by each corresponding weighing machine by supporting each weighing machine through a spacer interposed between the lower surface of the weighing table and the upper surface of each weighing machine when supporting the object. Because the way, in a single apparatus,
It is possible to selectively perform weighing with a weighing machine having different maximum weighing values or weighing accuracy.

In addition, when selecting and using various weighing machines that match the expected weighing error in advance on the same pass line, etc., it is possible to continuously weigh with various weighing machines, simplifying the transportation system, equipment In addition to simplifying and improving weighing accuracy,
The loading and unloading of the objects to be weighed can be easily automated, and the accuracy can be stably maintained for a long period of time without damaging the small-weight weighing machine or disturbing its accuracy.
Further, there is an advantage that the size of the container can be freely selected without any limitation as long as it can be placed on the weighing table.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the weighing device of the first invention,
(a) is a plan view, (b) is a view from AA in (a), (c) is B in (a).
-C arrow view, FIGS. 2 (a) to 2 (c) are schematic views of the apparatus of the embodiment of FIG. 1, and FIGS. 3 and 4 are views showing the operation structure of the movable spacer in the embodiment. And each (a)
Is a plan view, (b) is a front view, FIG. 5 is a view showing an embodiment of a weighing device of the second invention, (a) is a plan view, (b) is a front view, (c)
Is a view from the arrow D-E in (a), and FIGS. 6 (a) to 6 (c) are respectively the fifth view.
FIG. 7 is a schematic view of an apparatus of the embodiment shown in the figure, FIG. 7 is a schematic view showing an application system of a conventional weighing device, and FIGS. 8 and 9 are schematic diagrams showing how to use the conventional weighing device. 15 ... Large weighing scale, 16 ... Small weighing scale, 17,18 ... Container (weighing object), 19,45 ...
... Weighing stand, 21 ... Roller conveyor, 25 ... Support arm, 26 ... Cylinder (elevating means), 29, 30 ... Spacer, 46 ... Coil spring

Claims (2)

[Claims] 1. A plurality of weighing machines having different maximum weighing values or weighing accuracy are stacked from bottom to top in the order of the largest weighing value or in the order of lowest weighing accuracy. The weighing machines are stacked at predetermined intervals above the weighing machines. A weighing table configured to include a plurality of placing members which are arranged in parallel with each other, extend upward, and are movable up and down. The weighing platform for placing and supporting an object to be weighed and the upper side of the stacked weighing machines. Installed on the weighing machine, the supporting surface for placing and supporting the object to be weighed above the weighing machine is provided, and the supporting surface is above the weighing object placement supporting surface of the placing member constituting the weighing table or A roller conveyor type supporting means that can move up and down so as to be selectively located below, and in which each roller is arranged so that the respective mounting members can be inserted into the gap between the rollers. Type support means, A support arm, which is attached to the roller conveyor type support means so as to be movable integrally with the support means, supports the weighing table from the lower side in a state where the support means moves upward, and an elevating means for elevating the roller conveyor type support means And a spacer provided corresponding to each of the weighing machines and interposed between the lower surface of the weighing table and the upper surface of each of the weighing machines when the weighing target is supported by the weighing table, A structure in which a spacer corresponding to a weighing machine other than the weighing machine at the bottom of the weighing machine is selectively moved between a position interposed between the lower surface of the weighing table and an upper surface of the weighing machine and a retracted position. A weighing device characterized in that 2. A plurality of weighing machines having different maximum weighing values or weighing accuracy are stacked in a descending order from the largest weighing value or the smallest weighing accuracy, and the weighing machines are stacked at predetermined intervals above the weighing machines. A weighing platform configured to include a plurality of loading members arranged parallel to each other, extending upward and movably up and down, for placing and supporting an object to be weighed, and the weighing platform at the uppermost stage. It comprises a spring supporting above the weighing machine, and a supporting surface which is installed above the stacked weighing machines and places and supports the object to be weighed above the weighing machine, and the supporting surface constitutes the weighing table. Is a roller conveyor type supporting means movable up and down so as to be selectively positioned above or below the weighing object mounting support surface of the mounting member, wherein each roller is located in the gap between the rollers. Insert each mounting member Roller conveyor type supporting means arranged as much as possible, elevating means for raising and lowering the roller conveyor type supporting means, and a plurality of units provided corresponding to each of the weighing machines, the weighing at the time of supporting an object to be weighed by a weighing platform. A spacer interposed between the lower surface of the platform and the upper surface of each of the weighing machines, and a spacer corresponding to a weighing machine other than the weighing machine at the bottom of the plurality of weighing machines, and A weighing device characterized in that the weighing device is selectively moved to a position interposed between the weighing machine upper surface and a retracted position.