JP3679225B2 - Load cell support structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a load cell support structure, and more particularly to a load cell support structure used as a weighing element in a raw material storage structure of a food plant, a sewage tank, a storage tank, a hopper or a platform scale of a water treatment facility.
[0002]
[Prior art]
When measuring the weight of storage structures for raw materials for food plants, sewage tanks for water treatment facilities, hoppers for storing powder as feed in poultry farms or ranches, or tanks for storing liquids such as fuel, the foundation and these Measured with a load cell set on a load cell support structure interposed between a hopper and a tank. The structure that supports the load cell has an earthquake-resistant structure. An example of such a load cell support structure, may be mentioned those described in the actual fair 8-4576 JP example.
[0003]
Next, the weighing support structure, which is the above structure, will be briefly described with reference to FIGS. 10 and 11. The conventional weighing support structure 30 is fixed to an upper mounting plate 39 on which a support fitting 37 attached to an outer wall of an object to be weighed such as a hopper is placed and fixed to a beam 31 which is a base body such as a base. The upper mounting plate 39 and the lower mounting plate 34 have a parallel positional relationship with each other. Between the upper mounting plate 39 and the lower mounting plate 34, a load cell 70 for detecting the weight of the object to be weighed is disposed. To prevent the upper mounting plate 39 from separating in the Y direction shown in FIG. 11 due to an external force such as an earthquake, the rod-shaped member 60 is screwed into the screw hole 61 on the lower mounting plate 34 as shown in FIG. The upper end of the support fitting 37 is mounted and fixed on the upper mounting plate 39, and the upper end of the support fitting 37 is inserted through and freely fitted into a hole. A washer 80 and a nut 81 The horizontal nut 37-1 is prevented from coming off by the lock nut 82.
[0004]
Further, the upper mounting plate 39 is erected on the upper surfaces of the rectangular metal plate 45 and the lower mounting plate 34 provided on the lower surface of the upper mounting plate 39 so that the upper mounting plate 39 is not separated in the X direction shown in FIG. Between the metal plate 41 fixed to the upper end of the bracket 40, there is provided a connecting means rotatably attached to these. The connecting means includes a link 42 rotatably supported in a vertical plane direction by a shaft 43 with respect to the metal plate 41, and a link 46 rotatably supported in a vertical plane direction by a shaft 47 with respect to the rectangular metal plate 45. And the drive screw 51. Screws in opposite directions are cut at the ends of the links 42 and 46, and a drive screw 51 in which screws in opposite directions are cut from both ends inside the cylindrical drive screw 51 with respect to these screws. Screwed. When the head 50 of the drive screw 51 is rotated in one direction, the links 42 and 46 move in a direction approaching each other, and when rotated in the opposite direction, these move in a direction away from each other.
[0005]
The connecting means holds the upper mounting plate 39 so as not to move in the X direction with respect to the lower mounting plate 34 when an external force such as an earthquake or strong wind is applied to the upper mounting plate 39. The links 42 and 46 are rotatable in the vertical plane direction as described above, but when the upper mounting plate 39 and the lower mounting plate 34 are displaced in the horizontal direction (Z direction) due to thermal expansion or the like. In order to prevent the bearing portion of each link 42, 46 from being damaged, a ball joint mechanism such as a rod end bearing is used in this portion to allow some horizontal rotation. And the hopper etc. which are to-be-measured objects are supported by the base etc. by the support structure of the some load cell comprised in this way.
[0006]
[Problems to be solved by the invention]
As described above, the conventional load cell support structure has the following problems.
(1) There are many gaps, such as fittings, in the bearings of the rod end parts (links) 42 and 46, and when the contents are easily corroded by metal, this can enter the bearing part or be washed. The corrosion of the rod end part (link) is likely to proceed at an accelerated rate because the cleaning chemicals used at times or rainwater invades due to capillary action and easily collects.
(2) When installing the load cell support structure, the connecting means has a screw structure in order to absorb the dimensional error in the X direction of the upper mounting plate 39 and the lower mounting plate 34. In order to eliminate the distortion between the upper mounting plate 39 and the lower mounting plate 34, it is possible to perform pseudo weighing and judge by the size of the error, or to adjust the support structure of one load cell. As the support state of the thing changes, adjustment of the state of patrol such as readjustment continues, requiring considerable labor and experience for installation,
(3) When the load cell support structure is installed, if the dimensional accuracy of the mounting hole formed in the hopper or the like is poor and the position does not match the mounting hole opened in the upper mounting plate 39, the drive screw 51 is rotated to position it. Have to match,
(4) The horizontal plate 37-1 of the support bracket 37 fixed to the upper mounting plate 39 is provided with a hole through which the rod-like member 60 for restricting movement of the hopper or the like in the Y direction is inserted. Even if the relative displacement between the upper mounting plate 39 and the lower mounting plate 34 is large, this hole must be enlarged so that the rod-shaped member 60 can be inserted, and a thick and durable washer is inevitably formed in the rod-shaped member. Must be prepared to hold 60.
[0007]
The present invention is intended to eliminate the above-mentioned conventional drawbacks, and its object is to provide a first plate fixed in parallel to a foundation such as a base, and a distance from the first plate. A load cell support structure comprising: a second plate that receives the weight of an object to be weighed; and a load cell that is interposed between the first and second plates and measures a weight value applied to the second plate. , The part where corrosion progresses at an accelerated rate due to the invasion of rainwater and cleaning chemicals is reduced as much as possible, and the movement of the first and second plates can be restricted relative to the parallel and vertical directions and set. An object of the present invention is to obtain a load cell support structure that can be adjusted as easily as possible.
[0008]
[Means for Solving the Problems]
In order to achieve the object of the present invention as described above, the present invention includes a first plate, a second plate that faces the first plate at a distance and receives the weight of an object to be weighed, A load cell support structure comprising a load cell interposed between the first and second plates for weighing a weight value loaded on the second plate, and is supported by a side wall portion of the first plate. The second plate is supported by the side wall portion, and at least one of the bearing portions is loosely fitted to the corresponding plate to limit the distance between the first and second plates, and the second plate A connecting means for restricting the movement of the plate in the three axial directions, each of which includes the first plate, the second plate, the load cell, and the connecting means, and is arranged around the object to be weighed. A plurality of load cell support portions for supporting an object, the plurality of load cells; Of sandwiching member, providing a supporting structure of the load cell, characterized that you restrict the movement of two-axis direction of the objects to be weighed attached to different directions of the connecting plate between the load cell support portion disposed adjacent To do.
[0009]
Further, the present invention is the above invention, wherein the connecting means is provided with long through holes in the longitudinal direction at both ends of the connecting means. The through holes are inserted through pins protruding from the plates, and the pins abut against the outer edges of the through holes. It has a structure that limits the distance to be separated, and one end of the connecting means is rotatably supported by the plate, the other end is provided with a long through hole in the longitudinal direction, and a pin protruding from the plate is inserted into this through hole The load cell indicating structure is characterized in that the pin has a structure that abuts the outer edge of the through hole to limit the distance between the two plates.
[0010]
Furthermore, the invention is characterized in that, in the above invention, the connecting means is provided in two planes on both sides of the plate centering on the load cell, and the connecting means is substantially on the plane of the plate centering on the load cell. The load cell support structure is characterized in that three places are provided in the direction of 120 degrees, and the connecting means is provided in four places in the direction of approximately 90 degrees on the plane of the plate with the load cell as the center. I will provide a.
[0011]
Further, according to the present invention, when a ball provided at one end of a rod-like connecting means and a rod-like portion of the connecting means are inserted and the plates are separated from each other, the balls abut on the periphery and the two plates are separated. Provided is a load cell support structure having holes provided in a plate for limiting the distance.
[0012]
In addition, the present invention provides a load cell support structure in which connecting means inclined with respect to two plates arranged in parallel connect the two plates.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a load cell support structure according to the present invention. In FIG. 1, the load cell support structure includes an upper plate 101 attached to a support fitting provided on an object to be weighed such as a hopper and a lower plate 102 fixed to a supporter such as a beam fixed to a foundation such as a base. Have. The upper plate 101 and the lower plate 102 are formed in a square shape and are arranged in parallel to each other. A load cell 103 is disposed between the upper plate 101 and the lower plate 102.
[0014]
A connecting plate 106 is disposed between the side surfaces of the upper plate 101 and the lower plate 102. At the upper and lower ends of the connecting plate 106, rectangular through holes 107 and 108 that are long in the longitudinal direction of the connecting plate 106 are formed. Pins 109 and 110 pass through these through holes 107 and 108 and are screwed to the side surfaces of the upper plate 101 and the lower plate 102. Further, heads 111 and 112 for preventing the connecting plate 106 from coming off are formed at the heads of these pins 109 and 110. In addition, since the length from the upper end of the through-hole 107 to the lower end of the through-hole 108 is formed a little longer than the space | interval of the pins 109 and 110, the connection board 106 can move a little slidably in the longitudinal direction.
[0015]
FIG. 2 is a front view showing a state in which the load cell support structure configured as described above is mounted on the measurement structure of the object to be weighed. In the figure, reference numeral 113 denotes an object to be weighed such as a hopper for storing granular solid such as powder, liquid, or plastic chip. Two support plates 114, 115, 116 (not shown) and 117 (not shown) are provided on both side surfaces of the object to be weighed 113, respectively. A supporter 120 such as an H-shaped steel is hung around the edge of the interval 119 opened in the foundation 118 such as a base. The load cell support structures 121, 122, 123, and 124 according to the present invention are respectively attached between the upper surface of the supporter 120 and the support plates 114 to 117 provided on the side surface of the object to be weighed 113. The weight of the object to be weighed 113 is transmitted from the support plates 114 to 117 to the upper plate 101 of the support structure of each load cell, and a load is applied to the load cell 103 between the lower plate 102 and the weight detection element. The weight of the weighing object is detected.
[0016]
The arrows shown in FIG. 3 indicate the mounting directions of the load cell support structure. The directions of these arrows indicate that the upper plate 101 and the lower plate 102 move relative to each other while rotating the connecting plate 106 with respect to the pins. Shows direction. Assuming that an external force is applied to the object to be weighed in the X direction shown in FIG. 3 in the mounting state of the load cell support structure, as shown in FIG. Even if the lower plate 102 moves in any X direction, the pins 109 and 110 come into contact with the outer edges of the through holes 107 and 108, respectively, so that a tensile force acts on the connecting plate 106. Therefore, the load cell support structure, the object to be weighed, and the supporter 120 are not damaged even if the object to be weighed 113 is largely displaced.
[0017]
Further, if an external force is applied to the object 113 in the Z direction shown in FIG. 3, the upper plate 101 and the lower plate 102 of the support structures 121 and 124 are in any Z direction as shown in FIG. Even if it moves, the pins 109 and 110 abut against the outer edges of the through holes 107 and 108, respectively, so that a tensile force acts on the connecting plate 106. Therefore, the object to be weighed 113 is not greatly displaced and the load cell support structure, the object to be weighed, and the supporter 120 are not damaged. Further, even if an external force is applied obliquely in the intermediate direction between the X direction and the Z direction, the load cell support structure arranged by changing the angle of 90 degrees causes the object to be weighed 113 to be The load cell support structure, the object to be weighed, and the support structure 120 are not greatly displaced and damaged. Further, even if the upper plate 101 is lifted upward, there is no accident that the pins 109 and 110 abut against the outer edge of the through hole and the upper plate 101 and the lower plate 102 are separated.
[0018]
FIG. 5 is a perspective view showing a second embodiment of the present invention. As can be seen from this figure, the load cell support structure is substantially the same as in the first embodiment, but the lower end of the connecting plate 106 is not provided with a through hole, and is pivotally attached by a pin 110. In addition, the corner portion at the lower end thereof is a semicircular arc shape 125. For this reason, even if the thickness of the lower plate 102 is thin, the lower end portion of the connecting plate 106 does not protrude below the edge of the lower surface of the lower plate 102 when the connecting plate 106 rotates. Further, since the operation and effect when the upper plate 101 moves in the X direction, the Y direction, and the Z direction are substantially the same as those in the first embodiment, detailed description thereof is omitted.
[0019]
FIG. 6 is a perspective view showing a third embodiment of the load cell support structure according to the present invention. In FIG. 6, the load cell support structure includes an upper plate 401 attached to a support fitting provided on an object to be weighed such as a hopper and a lower plate 402 fixed to a supporter fixed to a foundation such as a base. The upper plate 401 and the lower plate 402 are arranged in parallel to each other. A load cell 403 is disposed between the upper plate 401 and the lower plate 402.
[0020]
Between the side surfaces of the upper plate 401 and the lower plate 402, two connecting plates 406 and 406 are arranged in a “C” shape of katakana. Rectangular through holes 407 and 408 that are long in the longitudinal direction of the connecting plate 406 are formed at the upper and lower ends of the connecting plates 406 and 406. Pins 409 and 410 pass through these through holes 407 and 408, and are screwed to the side surfaces of the upper plate 401 and the lower plate 402. Further, heads 411 and 412 are formed at the heads of these pins 409 and 410 to prevent the connecting plate 406 from coming off. The connecting plate 406 is inclined with respect to the upper plate 401 and the lower plate 402, and the distance from the upper end of the through hole 407 to the lower end of the through hole 408 is formed slightly longer than the interval between the pins 409 and 410. Therefore, the connecting plate 106 can move slightly in the longitudinal direction. Needless to say, a plurality of load cell support structures are arranged with respect to the object to be weighed in the same manner as in the first embodiment so that the horizontal strength becomes average.
[0021]
FIG. 7 is a perspective view showing a fourth embodiment of the load cell support structure according to the present invention. This embodiment is different from that shown in FIG. 6 only in that the connecting plate 406 is pivotally supported at both ends in the holes 501 and 502 formed in the upper plate 401 and the lower plate 402. The detailed explanation is omitted.
[0022]
In the load cell support structure shown in FIGS. 6 and 7, it is assumed that an external force is applied to the object to be measured in the + X direction, and the upper plate 401 moves in the + X direction as shown in FIG. The pins 409 and 410 are brought into contact with the lower ends of the through holes 407 and 408 of the right connecting plate 406 to apply a compressive force to the right connecting plate 406, and the upper ends of the through holes 407 and 408 of the left connecting plate 406 Pins 409 and 410 are brought into contact with the lower ends to apply a tensile force to the left connecting plate 406. It is assumed that the upper plate 401 has moved in the −X direction. Pins 409 and 410 are brought into contact with the lower ends of the through holes 407 and 408 of the left connecting plate 406 to apply a compressive force to the left connecting plate 406, and the upper ends of the through holes 407 and 408 of the right connecting plate 406 and Pins 409 and 410 are brought into contact with the lower ends, respectively, and a tensile force is applied to the right connecting plate 406. Therefore, the object to be weighed is not greatly displaced and the load cell support structure, the object to be weighed, and the supporter are not damaged. Furthermore, even if an external force acts diagonally in the middle direction between the X direction and the Z direction, the load cell support structure placed at a 90 degree angle is greatly limited by the pulling restriction of the connecting plate, so that The load cell support structure, the object to be weighed, and the support structure are not damaged due to displacement. Further, even if the upper plate 401 is lifted upward, the accident that the pins 409 and 410 abut against the outer edge of the through hole and the upper plate 401 and the lower plate 402 are separated does not occur.
[0023]
FIG. 9 is a partial front view showing a fifth embodiment of the load cell support structure according to the present invention. 9, the load cell support structure includes an upper plate 601 attached to a support fitting provided on an object to be weighed such as a hopper and a lower plate 602 fixed to a supporter fixed to a foundation such as a base. The upper plate 601 and the lower plate 602 are arranged in parallel to each other. A load cell 603 is disposed between the upper plate 601 and the lower plate 602. A bowl-shaped receiving hole 604 is formed in the upper plate 601, and a ball 606 provided at one end of a connecting rod 605 serving as a connecting means is fitted therein. The lower end of the connecting rod 606 is rotatably supported by a screw 607.
[0024]
In this embodiment, when the upper plate 601 and the lower plate 602 are in a normal position, the ball 606 of the connecting rod 605 is slightly lifted from the receiving hole 604, but the upper plate 601 is moved in the X direction. The connecting rod 605 rotates a little around the screw 607, and the ball 606 gets stuck in the receiving hole 604, exerts a tensile force on the connecting rod 605, and does not allow the upper plate 601 to move further. Needless to say, a plurality of load cell support structures are arranged with respect to the object to be weighed in the same manner as in the first embodiment so that the horizontal strength becomes average.
[0025]
Although the present invention has been described so far by the above-described embodiments, various modifications and applications are possible within the scope of the present invention, and these modifications and applications are excluded from the scope of the present invention. is not.
[0026]
【The invention's effect】
As described above in detail, according to the present invention, two plates are coupled to each other by a coupling means, and the coupling means is supported by each plate, and at least one of the bearing portions is free from the plate. Since it has a structure that limits the distance that the two plates separate from each other by the loose fitting part, there is no screw part etc. that adjusts the length of the connecting means as in the conventional case, so it is a simple structure. Even if it touches rainwater, these do not accumulate in the connecting means, and therefore, corrosion does not proceed at an accelerated rate on the connecting member. Further, even if the connecting means does not have a screw portion for adjusting the length, the load cell mounting structure can be positioned and mounted, so that the adjustment work can be saved. In addition, since the connecting means has a function of limiting the moving distance of the two plates in the separating direction, an accident due to jumping of the object to be weighed can be prevented with a simple structure.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a first embodiment of the present invention.
FIG. 2 is a front view showing a state in which a load cell support structure according to the present invention is attached to an object to be weighed.
FIG. 3 is a top view showing a state in which a load cell support structure according to the present invention is attached to an object to be weighed.
FIG. 4 is an explanatory diagram for explaining the operation of the first embodiment;
FIG. 5 is a perspective view showing a second embodiment.
FIG. 6 is a perspective view showing a third embodiment.
FIG. 7 is a perspective view showing a fourth embodiment.
FIG. 8 is an explanatory diagram for explaining the operation of the fourth embodiment;
FIG. 9 is a partial front view showing a fifth embodiment.
FIG. 10 is a front view showing a conventional example.
FIG. 11 is a perspective view showing a part of a conventional example.
[Explanation of symbols]
101 ... Upper plate 102 ... Lower plate 103 ... Load cell 106 ... Connection plate 107 ... Through hole 108 ... Through hole 109 ... Pin 110 ... Pin 111 ... Head 112 ... head 113 ... object 114 ... support plate 115 ... support plate 116 ... support plate 117 ... support plate 118 ... base 119 ... interval 120 ... Supporter 121 ... support structure 122 ... support structure 123 ... support structure 124 ... support structure 125 ... corner portion 201 ... upper plate 202 ... lower plate 203 ... load cell 204 · ..Case 205 ... Load receiving stand 206 ... Hole 207 ... Support shaft 208 ... Head 209 ... Support shaft 210 ... Head 211 ... Connecting plate 212 ... Through hole 213 ... Through hole 214 ... Nut 21 ... Nut 401 ... Upper plate 402 ... Lower plate 403 ... Load cell 406 ... Connecting plate 407 ... Through hole 408 ... Through hole 409 ... Pin 410 ... Pin 411 ... Head 412 ... Head 413 ... Measurement object 414 ... Support plate 415 ... Support plate 416 ... Support plate 417 ... Support plate 418 ... Base 419 ... Interval 501 ... Hole 502 ... Hole 601 ... Upper plate 602 ... Lower plate 603 ... Load cell 604 ... Reception hole 605 ... Connecting rod 606 ... Ball 607 ... Screw

Claims (9)

A first plate;
A second plate for receiving the weight of the object to be weighed with a distance from the first plate;
A load cell support structure comprising a load cell interposed between the first plate and the second plate for weighing a weight value applied to the second plate;
The first and second plates are supported on the side wall of the first plate and on the side wall of the second plate , and at least one of the bearing portions is loosely fitted to the corresponding plate. And a connecting means for restricting the movement of the second plate in the three-axis direction, while limiting the distance of the second plate ,
There are provided a plurality of load cell support portions each having the first plate, the second plate, the load cell, and the connecting means and arranged around the object to be weighed to support the object to be weighed,
The load cell support is characterized in that, among the plurality of load cell support portions, the connection plates of the load cell support portions arranged adjacent to each other are attached in different directions to restrict the movement of the object to be measured in two axial directions. Construction. Comprising at least four load cell support portions having the first plate, the second plate, the load cell and the connecting means;
The object to be weighed has support plates formed at four locations on opposite side surfaces,
The support structure according to claim 1, wherein the four second plates included in each of the four load cell support portions are positioned so as to support the corresponding support plates.   The connecting means is provided with long through holes in the longitudinal direction at both ends, and these through holes have a structure in which pins protruding from the plates are inserted, and the pins abut against the outer edges of the through holes to limit the distance between the two plates. The load cell support structure according to claim 1, wherein the load cell support structure is provided.   One end of the connecting means is rotatably supported by the plate, and the other end is provided with a through hole that is long in the longitudinal direction. A pin protruding from the plate is inserted into the through hole, and the pin contacts the outer edge of the through hole. 3. The load cell support structure according to claim 1, wherein the load cell support structure has a structure that limits a distance of separation of the plates.   The load cell support structure according to claim 1 or 2, wherein the connecting means is provided at two locations on both sides of the plane of the plate with the load cell as a center.   3. The load cell support structure according to claim 1 or 2, wherein the connecting means is provided at three locations in a direction of approximately 120 degrees in the plane of the plate centering on the load cell.   The load cell support structure according to claim 1 or 2, wherein the connecting means is provided at four locations in a direction of approximately 90 degrees in a plane of the plate centering on the load cell.   When the ball provided at one end of the rod-shaped connecting means and the rod-shaped portion of the connecting means are inserted and the plates are separated from each other, the ball abuts the periphery and limits the distance at which the two plates separate The load cell support structure according to claim 1, further comprising a hole provided therein.   3. The load cell support structure according to claim 1, wherein connecting means inclined with respect to the two plates arranged in parallel connect the two plates.

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