JP4870099B2 - Load cell with steady rest - Google Patents

Description

  The present invention relates to a load cell with a steady rest mechanism. More specifically, the present invention relates to a load cell with an anti-sway mechanism that is excellent in absorbability of a horizontal load caused by an earthquake, wind pressure, or the like, can be easily attached to a main body, and can easily center a sensitive portion.

Conventionally, as an industrial weighing machine such as a hopper scale or a tank scale capable of storing a large volume of powder or the like, a load detection device including a compression load cell is used for load detection.
In the case of a structure that measures the weight by supporting such a large weight with a load detection device, it can measure the hopper scale, etc. by absorbing the horizontal load (lateral shake) caused by wind pressure, earthquake, etc. A horizontal load absorbing mechanism (an anti-sway mechanism) is provided to prevent the target side from falling and to continue the load detection satisfactorily. For example, Patent Literatures 1 and 2 are known as a load detection device including such a horizontal load absorption mechanism.

Japanese Utility Model Publication No. 5-57630 Noto 3034534

However, conventionally known load detection apparatuses including Patent Documents 1 and 2 have a large number of parts constituting the apparatus main body, so that the apparatus installation method is complicated, and installation takes a long time. In addition, there was a problem of high cost. In addition, there is a problem that it cannot be easily visually recognized from the surroundings whether or not the sensitivity part of the load cell is in an appropriate posture.
Therefore, there is a demand for a structure that is simpler and easier to mount, can sufficiently absorb a large horizontal load, and can easily center the sensitive portion in the load cell. Yes.

  The present invention has been made in view of the above circumstances, and is excellent in absorbability of horizontal loads caused by earthquakes, wind pressures, and the like, can be easily attached to the main body, and can easily center the sensitive portion. An object is to provide a load cell with a steady rest mechanism.

  As a result of intensive research, the inventors have improved a portion corresponding to a conventional load cell cover and the like, and when a large horizontal load is generated, the head of the sensitivity portion or the load receiving portion in the load cell is By using a mechanism that directly absorbs the horizontal load by the sensitive part and load receiving part corresponding to the steady rest part corresponding to the cover, the horizontal load can be absorbed sufficiently, and the number of components of the main body Has been found to be able to be reduced and can be installed at low cost, and the present invention has been completed.

The present invention is as follows.
[1] (1) A fixing base attached to the fixed side, (2) a load receiving base attached to the load receiving side, and (3) a sensitivity unit interposed between the fixing base and the load receiving base. And,
The fixed base is provided with a cylindrical steady rest portion that covers the outer peripheral surface of the sensitivity portion at a predetermined interval (t ₂ ) , and the load receiving base includes a head portion of the sensitivity portion. Is formed, and a predetermined interval (t ₁ ) is formed between the inner surface of the notch and the outer peripheral surface of the head of the sensitivity portion,
The sensitivity part is a dumbbell shape composed of the head part, the strain generating part and the bottom part,
The strain-generating portion is smaller in diameter than the head and the bottom,
In the strain generating portion, a bridge circuit using a strain gauge is formed,
The detection signal of the bridge circuit is output via a lead cable,
When a horizontal load is generated, the head and the steady portion are brought into contact with each other to be steady .
An interval (t ₃ ) of _{3 to 30} mm is formed between the load cradle and the steady rest portion, and the head can be visually recognized from the outside from the interval (t ₃ ). And the load cell with an anti-sway mechanism characterized in that the strain-generating portion cannot be seen from the outside .
[2] The distance between the inner surface of the notch and the outer peripheral surface of the head of the sensitivity part is larger than the distance between the inner surface of the cylindrical hole of the steadying part and the outer peripheral surface of the sensitivity part. A large load cell with a steady rest mechanism according to [1] above.
[3] The load cell with an anti-sway mechanism according to the above [1] or [2], wherein a predetermined interval is formed between a back surface of the load receiving base and an upper surface of the anti-sway part.
[4] The load cell with an anti-sway mechanism according to any one of [1] to [3], wherein an upper end and a lower end of the sensitivity portion are spherical.
The reference invention includes (1) a fixing base attached to the fixed side, (2) a load receiving base attached to the load receiving side, and (3) a sensitivity interposed between the fixing base and the load receiving base. And (4) a load receiving portion that is disposed on the load receiving base and transmits the load in contact with the head of the sensitivity portion, and the fixed base includes the sensitivity portion and the load. The present invention relates to a load cell with an anti-sway mechanism characterized in that a cylindrical anti-skid part that covers the outer peripheral surface of the cradle with a predetermined interval is provided upright.

According to the load cell with an anti-sway mechanism of the present invention, the horizontal load caused by an earthquake or wind pressure can be sufficiently absorbed, the main body can be easily attached to the installation location, and the sensitivity part is centered. It can be done easily. Further, in the present invention, the portion corresponding to the conventional load cell cover is configured as an anti-rest portion, and the sensitivity portion directly absorbs a horizontal load by the head of the sensitivity portion accommodated against the anti-rest portion or the like. Therefore, the number of components is smaller than that of a conventional load cell equipped with a load cell containing a sensitivity part and a steady-state fitting for absorbing a horizontal load, reducing installation costs and manufacturing costs of the main body. Can be suppressed. Furthermore, it can be made smaller than the conventional load cell, and the floor area required for installation can be made smaller than before.
Further, the interval between the inner surface of the notch and the outer peripheral surface of the head of the sensitivity portion is made larger than the interval between the inner surface of the cylindrical hole of the steadying portion and the outer peripheral surface of the sensitivity portion. Thereby, it can be set as the load cell with the steadying mechanism which can absorb a horizontal load more reliably.
Furthermore, when a predetermined interval is formed between the back surface of the load receiving base and the top surface of the steady rest portion, the head position of the sensitivity portion can be visually confirmed from around the load cell. Therefore, the sensitivity part can be easily centered. Furthermore, it is possible to easily check whether the sensitivity part is in an appropriate posture, that is, whether it is in contact with the inner side surface of the notch part of the load cradle and the inner side surface of the steady rest part. Later periodic inspections can be easily performed in a short time.
Moreover, when the upper end and the lower end of the sensitivity part are spherical, the sensitivity part can be a load cell having an automatic alignment function.
According to the load cell with an anti-sway mechanism of the reference invention, the horizontal load generated by an earthquake or wind pressure can be sufficiently absorbed, the main body can be easily attached to the installation location, and the sensitivity part is centered. It can be done easily. Further, in the present invention, the portion corresponding to the conventional load cell cover is configured as a steadying portion, and the load receiving portion directly hits the steadying portion and the load receiving portion directly absorbs the horizontal load. Therefore, the number of components is smaller than that of a conventional load cell having a load cell in which a sensitivity part is stored and a steady-state fitting for absorbing a horizontal load, and the installation cost and the manufacturing cost of the main body can be suppressed. . Furthermore, it can be made smaller than the conventional load cell, and the floor area required for installation can be made smaller than before.

Hereinafter, embodiments of the present invention will be described in detail.
The load cell with an anti-sway mechanism according to the present invention includes a fixing base attached to the fixed side, a load receiving base attached to the load receiving side, and a sensitivity unit interposed therebetween.

The “fixing base” in the load cell with a steady stop mechanism of the present invention is attached to a fixed side such as a mounting base, and is usually fixed to the fixed side with a bolt or the like.
As the material of the fixing base, for example, steel materials such as ordinary steel such as general structural rolled steel and rolled steel for welded structure, and special steel such as carbon steel for mechanical structure and alloy steel for mechanical structure are used.
The shape of the fixed base is usually a flat plate shape, and the cross section thereof is a polygon such as a square, a rectangle, a hexagon and an octagon, a circle, or an ellipse.
Furthermore, the dimensions such as the thickness of the fixed base are appropriately adjusted according to the maximum load necessary for the load cell, the horizontal load resistance, the anti-lifting force, etc., and by increasing the dimensions such as the thickness of the fixed base, It is possible to increase the maximum load, horizontal load resistance, lift prevention force, and the like that can be obtained.

The fixed base is provided with a cylindrical steady rest portion, and this steady rest portion covers an outer peripheral surface of a later-described sensitivity portion with a predetermined interval.
Examples of the material of the steady rest include steel materials such as ordinary steel such as general structural rolled steel and welded rolled steel, and special steel such as carbon steel for mechanical structure and alloy steel for mechanical structure.
The cross-sectional shape of the cylindrical hole in the cylindrical steadying portion may be a polygon such as a square, a rectangle, a hexagon, and an octagon, a circle, or an ellipse. Among these, a circular shape is preferable. Further, as long as it has a cylindrical hole having such a cross-sectional shape, the cross-sectional shape of the steady rest is not particularly limited, for example, a polygon such as a square, a rectangle, a hexagon and an octagon, a circle, or an ellipse It can be.

  The thickness of the anti-rest portion is appropriately adjusted according to the horizontal load resistance required for the load cell. By increasing the thickness of the anti-rest portion, the obtained horizontal load resistance can be increased. The thickness of the steady rest portion does not need to be constant, and the steady rest portion is designed to increase in thickness as it approaches the fixed side (for example, a truncated cone shape having a cylindrical hole or the like). Thereby, it can be set as the load cell which can absorb a bigger horizontal load, without changing another dimension. It should be noted that the height of the steady rest is appropriately adjusted according to the size of the sensitivity part accommodated.

The fixed base on which the steadying portion is formed may be an integrally molded product, or may be a product obtained by separately manufacturing the stationary base and the steadying portion and then joining them by a known method such as welding. Good.
For example, the fixed base is manufactured by fitting a substantially cylindrical steady-state portion to a fixed base having a notch portion into which the steady-state portion can be fitted, and welding as necessary. be able to. At this time, the horizontal load resistance obtained can be increased as the depth at which the steady rest is fitted to the fixed base is increased, that is, as the volume of the fitted portion in the steady rest is increased.

In addition, the fixing base is usually provided with a mounting hole for attaching the fixing base to the fixing side with a bolt or the like. Furthermore, a lift prevention shaft mounting hole for inserting a lift prevention shaft for increasing the lift prevention force may be formed in the fixed base.
In addition, a cable discharge port for discharging a lead cable for outputting a signal detected by a sensitivity unit, which will be described later, to the outside is usually formed on the outer side surface of the steady rest portion.

In the load cell with an anti-sway mechanism of the present invention, the “load receiving base” is attached to the load receiving side, that is, the object to be measured such as a hopper scale or a tank scale. Fixed.
As the material of the load cradle, for example, steel materials such as ordinary steel such as general structural rolled steel and rolled steel for welded structure, and special steel such as carbon steel for mechanical structure and alloy steel for mechanical structure are used.
Moreover, the shape of a load receiving stand is a flat plate shape normally, and the cross section is circular, an ellipse, or a polygon.
Furthermore, the dimensions such as the thickness of the load cradle are appropriately adjusted according to the maximum load required for the load cell, the horizontal load resistance, the lifting prevention force, etc., and the thickness such as the thickness of the load cradle should be increased. Thus, it is possible to increase the maximum load, the horizontal load resistance, the lifting prevention force, and the like that can be obtained.

On the back side (fixed base side) of the load receiving base, a concave notch is formed, through which the head of the sensitivity part described later is inserted, and the inner surface of the notch and the outer periphery of the sensitivity part head A predetermined interval is formed between the surfaces.
The cross-sectional shape of the notch may be a polygon such as a square, a rectangle, a hexagon and an octagon, a circle, or an ellipse. Among these, a circular shape is preferable.
Further, the depth of the notch is appropriately adjusted depending on the dimension of the head of the sensitivity part to be inserted.

  The load receiving base in which the notch is formed may be an integrally molded product, or, as shown in FIG. 1, a load receiving portion 32 and a notch 31 formed so that the load receiving portion can be fitted. It may be comprised from the load receiving stand 3 provided with.

  The load cradle is usually provided with a mounting hole for mounting the load cradle on the load receiving side with a bolt or the like. Furthermore, a lift prevention shaft mounting hole for inserting a lift prevention shaft for increasing the lift prevention force may be formed in the load receiving base.

As the sensitivity section (strain generating body) in the load cell with a steady stop mechanism of the present invention, a bridge circuit is formed using a strain gauge 44 in the strain generating section 43 as shown in FIG. A sensitivity unit 4 capable of outputting a detection signal via a lead cable (not shown) is used.
Further, as shown in FIG. 1, a dumbbell shape in which the strain generating portion 43 is smaller in diameter than the head portion 41 and the bottom portion 42 is used. The outer diameters of the head 41 and the bottom 42 may be the same or different, but are preferably the same. Further, the volume of the head 41 and the bottom 42 may be the same or different, but the volume of the head 41 that directly absorbs the horizontal load is larger than the bottom 42 and becomes high strength. It is preferable.
Furthermore, the surface shape of at least the lower end of the upper and lower ends of the sensitivity part is preferably spherical, and the surface shape of both ends is more preferably spherical. In this case, an automatic alignment action can be imparted to the sensitivity part.

Further, in the load cell with a steadying mechanism of the present invention, the sensitivity part is interposed between the fixed base and the load receiving base. Specifically, as shown in FIG. The head 41 is inserted into the notch 34 formed in the load receiving base 3, and the sensitivity part bottom 42 is supported in a form inserted through the cylindrical hole of the steady rest 21 in the fixed base 2.
At this time, as shown in FIG. 3, a predetermined interval [hereinafter referred to as “interval (t ₁ )” is defined between the outer peripheral surface of the head 41 of the sensitivity unit 4 and the inner surface of the notch 34. ] Between the outer peripheral surfaces of the head 41 and the bottom 42 of the sensitivity part 4 and the inner surface of the cylindrical hole of the steadying part 21 [hereinafter referred to as “interval (t ₂ ) ". ] Is formed.
Since the distances (t ₁ ) and (t ₂ ) are formed, when a horizontal load is generated, the head of the sensitivity unit is supported by the inner surface of the steadying portion corresponding to the load cell cover and the load receiving portion. Since the sensitivity part is a mechanism that directly absorbs the horizontal load when it hits the inner surface of the notch formed in the base, the horizontal load can be sufficiently absorbed with a smaller number of parts than in the past.

The distance (t ₁ ) can be adjusted as appropriate depending on the allowable run-out width of the load cell and the required horizontal load resistance, and is, for example, 2 to 50 mm, particularly 2.5 to 40 mm, and more preferably 3 to 30 mm. be able to.
Further, the distance _{(t 2),} which can be appropriately adjusted by the amplitude and required water plane load of the load cell to be acceptable, for example, 1 to 20 mm, in particular 2 to 15 mm, more and 2~10mm be able to.
Furthermore, in the present invention, it is preferable that the interval t ₁ is larger than the interval t ₂ . In particular, the ratio (t ₂ : t ₁ ) between the interval t ₂ and the interval t ₁ is preferably 1: (1.2-3), more preferably 1: (1.3-2.5). More preferably, it is 1: (1.5 to 2.5). Thus when distance t ₁ is larger than the interval t ₂ can sufficiently absorb the horizontal load.

Moreover, in the load cell with a steady-rest mechanism of the present invention, as shown in FIG. 3, the load receiving base 3, the steady-rest portion 21, and the head of the sensitive portion can be visually confirmed from the surroundings. _{3 to 30} mm interval [hereinafter also referred to as “interval (t ₃ )”. ] Is formed.
From this interval (t ₃ ), the head of the sensitive part can be visually recognized from the outside, and the strain-generating part of the sensitive part cannot be visually recognized from the outside.

In addition, the load cell with a steady rest mechanism according to the reference invention is disposed on the fixed base attached to the fixed side, the load base attached to the load receiving side, the sensitivity part interposed therebetween, and the load receiving base. And a load receiving portion that contacts the head of the sensitivity portion and transmits the load. The above description can be applied as it is to the “fixing base” and the “sensitivity section”.

The "load receiving platform" in the load cell with a steady stop mechanism according to the reference invention is attached to the load receiving side, i.e., the object to be measured such as a hopper scale or a tank scale. Fixed.
As the material of the load cradle, for example, steel materials such as ordinary steel such as general structural rolled steel and rolled steel for welded structure, and special steel such as carbon steel for mechanical structure and alloy steel for mechanical structure are used.
Moreover, the shape of a load receiving stand is a flat plate shape normally, and the cross section is circular, an ellipse, or a polygon.
Furthermore, the dimensions such as the thickness of the load cradle are appropriately adjusted according to the maximum load required for the load cell, the horizontal load resistance, the lifting prevention force, etc., and the thickness such as the thickness of the load cradle should be increased. Thus, it is possible to increase the maximum load, the horizontal load resistance, the lifting prevention force, and the like that can be obtained.

The load receiving base is provided with a load receiving portion that contacts the head of the sensitivity portion and transmits the load, and the bottom side of the load receiving portion is inserted into the cylindrical hole of the steady stop portion of the fixed base.
A predetermined gap is formed between the outer peripheral surface on the bottom side of the load receiving portion and the inner surface of the cylindrical hole in the steadying portion. In addition, the length of the load receiving part bottom part inserted in the cylindrical hole in the steadying part is appropriately adjusted according to the dimensions of other members.
Moreover, the structure of the said load receiving part will not be specifically limited if it is formed so that fitting to a load receiving stand is possible, and it can also be set as a split type (the 1st load receiving part 321 in FIG. 9, 2nd load receiving part). Part 322). When the load receiving portion is a split type, the upper end side of the load receiving portion (see the second load receiving portion 322 in FIG. 9) that absorbs the horizontal load is preferably spherical, and the lower end side is sensitive. It is preferable to have a shape that can be fitted to the top surface of the part.

  The load cradle is usually provided with a mounting hole for mounting the load cradle on the load receiving side with a bolt or the like. Furthermore, a lift prevention shaft mounting hole for inserting a lift prevention shaft for increasing the lift prevention force may be formed in the load receiving base.

In the load cell with an anti-sway mechanism of the reference invention, the sensitivity part is interposed between the fixed base and the load receiving part in the load base, specifically, as shown in FIG. The entire sensitivity part 4 is inserted into the cylindrical hole of the steadying part 21 in the fixing base 2 and the bottom side of the load receiving part 32 arranged in the load receiving base 3 is in contact with the sensitivity part head 41. 2 is supported in the form of being inserted through the cylindrical hole of the steady rest 21 in FIG.
At this time, as shown in FIG. 8, a predetermined interval [hereinafter referred to as “interval (t ₄ ) ". ] Is formed.
By being this distance (t ₄₎ is formed, when the horizontal load occurs, steadying outer peripheral surface of the load receiving part to be inserted into the cylindrical bore of the bracing portion 21 corresponds to the load cell cover Since the load receiving portion is a mechanism that directly absorbs the horizontal load, the horizontal load can be sufficiently absorbed with fewer parts than in the past.

The interval (t ₄ ) can be adjusted as appropriate depending on the allowable run-out width of the load cell and the required horizontal load resistance. it can.

Further, in the load cell with a steady rest mechanism of the reference invention , as shown in FIG. 8, the back surface of the load receiving base 3 and the load receiving section 3 and the sensitivity section head can be visually confirmed from the surroundings. A predetermined interval [hereinafter referred to as “interval (t ₅ )” between the upper surface of the steady rest portion 21. ] Is formed.
The interval _{(t 5),} which can be suitably adjusted to the dimensions of the overall load cell, for example, 3 mm or more, particularly 5 to 30 mm, more may be 5 to 15 mm.

Furthermore, when the load receiving portion 32 is a split type, the sensitivity portion is specifically inserted through the cylindrical hole of the steady rest portion 21 in the fixed base 2 as shown in FIG. In addition, the bottom side of the second load receiving portion 322 fitted between the first load receiving portion 321 and the sensitivity portion 4 disposed on the load receiving base 3 is fixed so as to contact the sensitivity portion head 41. It is supported in the form of being inserted through the cylindrical hole of the steady rest portion 21 in the table 2.
At this time, as shown in FIG. 10, a predetermined interval [hereinafter referred to as “interval (t ₆ )” is defined between the upper outer peripheral surface of the second load receiving portion 322 and the inner surface of the notch portion 34. . ] Is formed, and a predetermined interval [hereinafter, referred to as a gap between the outer peripheral surface of the sensitivity portion 4 and the outer peripheral surface of the lower portion of the second load receiving portion 322 and the inner surface of the cylindrical hole of the steady rest portion 21]. Also referred to as “interval (t ₇ )”. ] Is formed.
Since the distances (t ₆ ) and (t ₇ ) are formed, when a horizontal load is generated, the lower side of the second load receiving portion is the inner surface of the steady portion corresponding to the load cell cover, Since the load receiving part is a mechanism that directly absorbs the horizontal load when it hits the inner surface of the notch formed in the load cradle, the horizontal load can be absorbed sufficiently with fewer parts than before. .

The distance (t ₆ ) can be appropriately adjusted depending on the allowable load cell swing width and necessary horizontal load resistance, and is, for example, 2 to 50 mm, particularly 2.5 to 40 mm, and more preferably 3 to 30 mm. be able to.
Further, the distance _{(t 7),} which can be appropriately adjusted by the amplitude and required water plane load of the load cell to be acceptable, for example, 1 to 20 mm, in particular 2 to 15 mm, more and 2~10mm be able to.
Further, in this configuration, it is preferred spacing t ₆ is larger than the interval t _7. In particular, the ratio (t ₇ : t ₆ ) between the interval t ₇ and the interval t ₆ is preferably 1: (1.2-3), more preferably 1: (1.3-2.5). More preferably, it is 1: (1.5 to 2.5). Thus when distance t ₆ is larger than the interval t ₇ can be sufficiently absorbed horizontal load.

Further, in the configuration including the split type load receiving portions (321, 322), as shown in FIG. 10, the states of the sensitivity portion 4 and the second load receiving portion 322 can be visually confirmed from the surroundings. A predetermined interval [hereinafter also referred to as “interval (t ₈ )” between the back surface of the load receiving base 3 and the upper surface of the steady rest 21. ] Is formed.
The interval _{(t 8),} which can be suitably adjusted to the dimensions of the overall load cell, for example, 3 mm or more, particularly 5 to 30 mm, more may be 5 to 15 mm.

In addition, the maximum load (anti-vertical load) of the load cell with the anti-sway mechanism in the present invention can be adjusted as appropriate by adjusting the dimensions of the entire load cell. For example, it is 1T or more, particularly 5 to 200T, more preferably 10 It can be set to ~ 100T.
Furthermore, the horizontal load resistance of the load cell with a steadying mechanism according to the present invention can be adjusted as appropriate by adjusting the dimensions of the entire load cell. For example, 5T or more, particularly 10 to 100T, more preferably 15 to 100T. be able to.

Hereinafter, the present invention will be described in detail with reference to the drawings.
[1] Example 1
In the first embodiment, a 20T load cell (withstand horizontal load; 15T or more) is exemplified as the “load cell with a steady rest mechanism” according to the present invention.

(1) Configuration of Load Cell with Stabilization Mechanism FIG. 1 [Disassembled perspective view explaining the configuration of the load cell of the first embodiment] and FIG. 2 [Schematic diagram explaining the cross section (diagonal cross section) of the load cell of the first embodiment] As shown in FIG. 1, the load cell 1 with a steady-rest mechanism according to the first embodiment is attached to a fixed base 2 made of special steel (size: length 200 × width 300 × thickness 36 mm) attached to the fixed side, and attached to the load receiving side. And a special steel load receiving base 3 (size: length 200 × width 300 × thickness 36 mm), and a special steel sensitivity section 4 interposed therebetween.

  The fixing base 2 has mounting holes 23 (diameter: about 28 mm) for mounting on the fixing side via bolts at four corners. Further, on the surface side (load receiving side) of the fixed base 2, a cylindrical steady rest portion 21 (outer diameter: about 127 mm, inner diameter: about 67 mm, height: 74 mm) made of special steel is erected. A lead cable discharge port 22 for transmitting a detection signal in the sensitivity unit 4 is formed on the outer peripheral surface of the steady rest portion 21.

  A notch 34 (diameter: about 73 mm) through which the head 41 of the sensitivity part 4 is inserted is formed in the load receiving base 3 by fitting a load receiving part 32 made of special steel into the notch 31. Has been. In addition, mounting holes 33 (diameter: about 28 mm) for mounting on the load receiving side via bolts are formed in the load receiving base 3 at four corners.

  The sensitivity part 4 includes a head 41, a strain generating part 43, and a bottom part 42. The strain generating part 43 is smaller in diameter than the head 41 (diameter: about 60 mm) and the bottom part 42 (diameter: about 60 mm). Dumbbell shape. Moreover, the surface shape of the upper end and the lower end of the sensitivity part 4 is both spherical. Further, a bridge circuit is formed in the strain generating portion 43 using a strain gauge 44, and a load detection signal of the bridge circuit is output to the outside by a lead cable (not shown).

(2) Installation of Load Cell with Stabilizing Mechanism As shown in FIG. 2, the load cell 1 with the steady rest mechanism of the present invention is inserted into the notch 34 formed in the load receiving base 3 at the head 41 of the sensitivity unit 4. In addition, the fixed base 2 is supported on the fixed side 5 such as the mounting base via the mounting hole 23 so that the bottom 42 of the sensitivity section 4 is supported by being inserted into the cylindrical hole of the steady rest 21 in the fixed base 2. It is fixed by a bolt (not shown), and the load receiving base 3 is fixed to the measuring object side 6 such as a hopper scale by a bolt (not shown) through the attachment hole 33.
At this time, as shown in FIG. 3, an interval t ₁ (about 6.5 mm) is formed between the outer peripheral surface of the head portion 41 of the sensitivity portion 4 and the inner side surface of the notch portion 34. Further, an interval t ₂ (about 3.5 mm) is formed between the outer peripheral surfaces of the head portion 41 and the bottom portion 42 of the sensitivity portion 4 and the inner surface of the cylindrical hole of the steady rest portion 21. Furthermore, an interval t ₃ (about 5 mm) is formed between the back surface of the load receiving base 3 and the top surface of the steady rest 21.
Further, between the sensitivity part 4 and the steadying part 21 is usually filled with a moisture-proofing agent or the like and sealed with a sealing material such as an O-ring or a lid (not shown).
Further, in order to prevent the position shift of the sensitivity section 4 inserted through the cylindrical hole of the steady rest section 21, a position shift prevention material (not shown) such as an O-ring is provided around the sensitivity section head 41 and the bottom section 42. May be provided. At this time, a sealing material such as the above-described O-ring may function as a displacement prevention material.

(3) Effects of Example 1 According to the load cell 1 with the steadying mechanism of Example 1, the distances (t ₁ ) and (t ₂ ) are formed (see FIG. 3), earthquakes, wind pressures, etc. 4 and 5, when the horizontal load is generated, (i) the head portion 41 of the sensitivity portion 4 hits the upper side of the steady portion 21 corresponding to the load cell cover (portion X in FIG. 4). Or (ii) the head 41 of the sensitivity unit 4 hits the inner surface of the steady rest 21 corresponding to the load cell cover (see X in FIG. 5), and the head 41 of the sensitivity unit 4 is the load receiving base. 3 (see the Y portion in FIG. 5), the sensitivity portion 4 itself is a mechanism that directly absorbs the horizontal load, so that the horizontal load can be sufficiently absorbed.

Further, in the load cell of the first embodiment, as described above, since the sensitivity part itself is a mechanism that absorbs the horizontal load, the steady rest restricting part is not provided in another place, and it is more than conventional. The main body can be configured with a small number of parts. Therefore, the main body can be easily attached to the installation location in a short period of time, and the installation cost can be suppressed.
Furthermore, as shown in FIG. 3, since a space (t ₃ ) is formed between the back surface of the load receiving base 3 and the top surface of the steadying portion 21, the sensitivity portion 4 is surrounded by the load cell 1. The position of the head 41 can be visually confirmed. As a result, the sensitivity unit 4 can be easily centered. Furthermore, the sensitivity unit 41 is in an appropriate posture, that is, the inner surface of the notch 34 of the load receiving base 3 and the steady-state unit. It can be easily confirmed whether it is in contact with the inner surface of 21, and periodic inspection after installation can be easily performed in a short time. Further, since the shim can be easily inserted into the head, the level can be easily adjusted.
Moreover, since the sensitivity part in the load cell of the first embodiment has a spherical shape at the upper end and the lower end surface, it has an automatic alignment function.

  Further, in the load cell with a steadying mechanism according to the first embodiment (see FIG. 2), the bolt (not shown) fixing the load receiving base 3 is removed for level adjustment of the main body at the time of installation or inspection. Without this, it is possible to easily carry out by simply jacking up the load receiving base 3 as the upper plate and inserting a shim plate (not shown) between the load receiving portion 32 and the sensitivity portion head 41. As a result, it is possible to greatly reduce the time required for the conventional level adjustment, which is performed by removing the fixing bolt and removing the upper plate (load receiving base) when installing or inspecting the load cell.

[2] Examples 2 to 10
(1) Configuration of load cell with steady rest mechanism By changing the dimensions of the constituent members in FIGS. 6 (a) and 6 (b) as shown in Table 1, the rated capacity (anti-vertical load) is 1 to 100T, The load cell with each steady rest mechanism of Examples 2-10 whose horizontal load is 5-100T was manufactured. 6A is an explanatory view schematically showing an upper surface with the load receiving base 3 removed, and FIG. 6B is an explanatory view schematically showing a cross section of the load cell 1. FIG.

In the figure, “A” is the horizontal length of the fixing base 2 and the load receiving base 3, “B” is the vertical length of the fixing base 2 and the load receiving base 3, and “C” is the thickness of the fixing base 2. , “D” is the thickness of the load receiving base 3, “E” is the distance between the fixed base 2 and the load receiving base 3, “F” is the height of the load cell 1, and “G” and “J” are the mounting holes 23. (33) The distance between them, “H” and “I” are the distance from the mounting hole 23 (33) to the end, “K” is the outer diameter of the cylindrical steady rest 21, and “L” is the mounting hole 23 ( 33). Note that predetermined intervals (t ₁ ) and (t ₂ ) (see FIG. 3) are formed in accordance with the inner diameter of the sensitivity unit 4 and the cylindrical steady rest 21 in each embodiment. Further, the configuration other than the dimensions of the load cell 1 with the steady rest mechanism is the same as that of the first embodiment.

(2) Effects of Examples 2 to 10 According to Examples 2 to 10, in addition to the effects of Example 1, the floor area required for installation can be greatly reduced compared to the conventional load cell. It can be made smaller than before.

  In addition, in this invention, it can restrict to what is shown to a specific Example, It can be set as the Example variously changed within the range of this invention according to the objective and the use. For example, in the load cell with an anti-sway mechanism (see FIG. 1) of the first embodiment, lift prevention shaft mounting holes 35 (load receiving side) and 24 (on the load receiving side) and 24 ( By providing a fixing base side) and inserting a lifting prevention shaft (not shown) through these mounting holes from the load receiving side and fixing, a lifting prevention force of the main body can be increased.

Moreover, the structure of the load receiving base 3 is changed, and as shown in FIGS. 7 and 8, the lower side of the load receiving portion 32 hits the upper inner surface of the steady rest portion 21 corresponding to the load cell cover, and the load receiving portion is horizontally loaded. It can also be set as the mechanism which absorbs (reference invention) . Further, as shown in FIG. 9 and FIG. 10, the load receiving portion has a split structure, and (i) the inner side surface of the steady rest portion 21 in which the lower side of the second load receiving portion 322 corresponds to the load cell cover. Or (ii) the lower side of the second load receiving portion 322 hits the inner surface of the steady rest portion 21 corresponding to the load cell cover, and the upper side of the second load receiving portion 322 is the notch 34 of the load receiving base 3 By hitting the inner surface, the load receiving portion can also be configured to absorb a horizontal load (reference invention) .

  The load cell with an anti-sway mechanism according to the present invention can be suitably used in the field of industrial weighers such as a hopper scale and a tank scale.

It is a disassembled perspective view explaining the structure of the load cell with a steadying prevention mechanism. It is a schematic diagram explaining the cross section of a load cell with a steadying prevention mechanism. It is a schematic diagram explaining the principal part cross section of a load cell with a steadying prevention mechanism. It is a schematic diagram explaining the cross section of the load cell with a steadying mechanism when a horizontal load arises. It is a schematic diagram explaining the cross section of the load cell with a steadying mechanism when a horizontal load arises. It is a schematic diagram explaining the upper surface and cross section of the load cell. It is a schematic diagram explaining the cross section of the load cell with a steady rest mechanism of another form. It is a schematic diagram explaining the principal part cross section of the load cell with a steadying mechanism of another form. It is a schematic diagram explaining the cross section of the load cell with a steady rest mechanism of another form. It is a schematic diagram explaining the principal part cross section of the load cell with a steadying mechanism of another form.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1; Load cell with an anti-sway mechanism, 2; Fixing stand, 21; Anti-sway part, 22; Discharge port, 23; Mounting hole, 24; Lifting prevention shaft attaching hole, 3; Load receiving base, 31; ; Load receiving portion, 321; First load receiving portion, 322; Second load receiving portion, 33; Mounting hole, 34; Notch portion, 35; Lifting prevention shaft mounting hole, 4; Sensitivity portion, 41; Part, 42; sensitivity part bottom part, 43; strain generating part, 44; strain gauge, 5; fixed side, 6; load receiving side.

Claims (4)

(1) a fixed base mounted on the fixed side;
(2) a load receiving base attached to the load receiving side;
(3) a sensitivity unit interposed between the fixed base and the load receiving base,
The fixed base is provided with a cylindrical steady rest portion that covers the outer peripheral surface of the sensitivity portion at a predetermined interval (t ₂ ) , and the load receiving base includes a head portion of the sensitivity portion. Is formed, and a predetermined interval (t ₁ ) is formed between the inner surface of the notch and the outer peripheral surface of the head of the sensitivity portion,
The sensitivity part is a dumbbell shape composed of the head part, the strain generating part and the bottom part,
The strain-generating portion is smaller in diameter than the head and the bottom,
In the strain generating portion, a bridge circuit using a strain gauge is formed,
The detection signal of the bridge circuit is output via a lead cable,
When a horizontal load is generated, the head and the steady portion are brought into contact with each other to be steady .
An interval (t ₃ ) of _{3 to 30} mm is formed between the load cradle and the steady rest .
From the space (t ₃ ), the load cell with an anti-sway mechanism is characterized in that the head can be seen from the outside and the strain-generating portion cannot be seen from the outside .   The distance between the inner surface of the notch and the outer peripheral surface of the head of the sensitivity portion is larger than the distance between the inner surface of the cylindrical hole of the steadying portion and the outer peripheral surface of the sensitivity portion. 2. A load cell with a steady rest mechanism according to 1.   The load cell with an anti-sway mechanism according to claim 1 or 2, wherein a predetermined interval is formed between a back surface of the load cradle and an upper surface of the anti-sway part.   The load cell with an anti-sway mechanism according to any one of claims 1 to 3, wherein an upper end and a lower end of the sensitivity portion are spherical.

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