JP2008180559A - Weight testing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a weight testing apparatus capable of performing highly accurately test by holding a plurality of load cells for weight test having different weighing capacities in stable attitudes when load is acting. <P>SOLUTION: The weight testing apparatus is provided with a supporting fixed frame fixed to a foundation in an attitude crossing over a platform scale to be inspected; a load generating device serially arranged in an attitude in a line in a vertical direction between a mounting platform of the platform scale to be inspected and a part of the supporting fixed frame above the mounting platform; and a load cell unit 14 for weight test. The load cell unit 14 is provided with a plurality of load cells 16 and 17 having different weighing capacities and Roberval mechanisms 18 and 19. The Roberval mechanisms 18 and 19 are each arranged correspondingly to the load cells 16 and 17 for supporting them in such a way that they may be serially arranged one on the other in an attitude in a line in a vertical direction and that their loading points may overlap each other in a vertical direction. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a weighing apparatus for inspecting a large scale such as a truck scale.

Conventionally, as an inspection method (referred to as a gravimetric method) for a platform scale, weights of known mass are sequentially placed, and a measurement error between the total mass of the weights and a measurement load by the platform balance is confirmed.
However, when inspecting a large scale weighing over 40 tons, such as a truck scale installed at a predetermined location, it is necessary to procure a large mass and place it on top of it. Each of the work to procure, the work to transport these weights to the place where the weights are installed, and the work to load and unload these weights in a row takes a lot of time and effort and has a very large economic burden. It was done.

  Non-Patent Document 1, Patent Document 1, etc. show a gravimetric apparatus for inspecting a large scale scale without using a mass of mass, in order to omit such weight procurement work, transport work, and loading work. Has been.

  FIG. 18 shows a case of a weight measuring apparatus for inspecting a truck scale as an example of a large platform scale. As shown in FIG. 18, a pit 102 is dug in the base 101, and a platform scale (hereinafter referred to as an object to be inspected) is formed by supporting the four corners of the stage 104 by a plurality of load cells 103 in the pit 102. 105 (referred to as a platform scale) is disposed, and when weighing, a weighing object such as a truck is placed on the platform 104.

  The weighing apparatus for inspecting the inspection table scale 105 has a mountain-shaped support fixing frame 107 in which both ends thereof are fixed to the foundation 1 via fixing bolts 106 such as anchor bolts in a posture over the inspection table scale 105. And a hydraulic cylinder device 108 as a load generating device and a load cell unit 109 for weight detection (inspection) disposed in a state where they are in series contact with each other between the top portion 107a of the support fixing frame 107 and the mounting base 104. It consists of and. In the case shown in FIG. 18, the load cell unit 109 is placed on the mounting table 104, and the piston rod 108 a of the hydraulic cylinder device 108 is disposed so as to contact from above the load cell unit 109.

  When hydraulic pressure is applied to the cylinder of the hydraulic cylinder device 108 at the time of inspection, the pressing force from the hydraulic cylinder device 108 is applied to the inspection table scale 105 via the load cell unit 109. By confirming the weighing error between the total measured load of the load cell 103 and the detected load of the load cell unit 109, the test table scale 105 can be inspected. Note that the upward reaction force generated from the hydraulic cylinder device 108 at this time is received by the mountain-shaped support fixing frame 107 fixed to the foundation 101 by the fixing bolt 106.

  According to this weighing apparatus, it is possible to inspect the inspection table scale 105 which is a large scale without using a mass with a relatively simple equipment, and the weight required when using a weight. Thus, it is not necessary to perform the procurement work, the transport work, and the loading / unloading work, so that the economic burden can be reduced, and much labor and time required for these work can be saved. In addition, a load can be satisfactorily applied to the inspection table scale 105 having the mounting table 104.

  By the way, this type of weighing apparatus is required to have higher accuracy than the platform scale to be inspected. For example, the uncertainty (so-called accuracy) required for a track scale weigher, which is one of these types of weighers, must be less than 1/3 of the verification tolerance of the track scale to be tested. Is determined by law (measurement law).

  For example, the scale tolerance of a scale of 5000 scale (ie, 1 scale (scale) 10 kg) at 50 t is 5 kg from 0 to 5 t, 10 kg from 5 to 20 t, and 15 kg from 20 to 50 t. The required accuracy of the weighing device is required to be about 1.67 kg from 0 to 5 t, about 3.33 kg from 5 to 20 t, and 5 kg from 20 to 50 t.

  However, as a load cell unit 109 of the weighing device, one load cell for weighing, which has high accuracy, that is, as described above, can measure up to 50 t, but has accuracy of about 1.67 kg from 0 to 5 t. If it is to be used, high manufacturing accuracy is required, so that an extremely expensive one is required.

  As a method for dealing with this, a plurality of weighing load cells having different maximum weighing capacities are stacked in series in the vertical direction on a load cell unit 109 interposed between the hydraulic cylinder device 108 and the platform scale 105 to be inspected. It is possible to arrange them side by side. That is, as shown in FIG. 19, a large-scale load cell 111 and a small-scale load cell 112 are arranged so as to be stacked one above the other, and the minimum scale scale (hereinafter referred to simply as scale) in the range of the small scale. The value measured by the small weighing load cell 112 is used, and the value measured by the large weighing load cell 111 having a scale larger than that of the small weighing load cell 112 is adopted in the large weighing range larger than the small weighing. As a result, it is possible to suppress uncertainty within the small weighing range to a small extent (increase accuracy) (Patent Document 2, FIG. 4, etc.).

In FIG. 19, reference numeral 113 denotes a connection beam for connecting the load cells 111 and 112, and reference numeral 114 denotes a mounting table to which a load is applied. The structure is such that the load cells 111 and 112 are connected vertically via the connection beam 113. It is.
1977 Metering Equipment Verification Facility Rationalization Research Report “Vehicle Scale Certification Rationalization Study” (Japan Metrology Instrument Industry Federation, distributed in March 1978), page 23 Japanese Patent Laid-Open No. 55-141629, FIG. 1, etc. JP-A-62-32324, FIG. 4 and the like

  However, as shown in FIG. 19, a load cell unit having a structure in which a plurality of weighing load cells 111 and 112 are simply connected in the vertical direction via a connecting beam 113 is used as a weighing apparatus as shown in FIG. If the load cells 111 and 112 are combined and arranged, the positions of the portions connecting the load cells 111 and 112 are not restricted at all. Therefore, including the portions connecting the load cells 111 and 112, each load cell 111, 112, There is a problem that the posture of 112 is unstable. Therefore, when a load is applied by the hydraulic cylinder device 108 of the weighing device, there is a risk that the load cells 111 and 112 may be inclined so that they do not receive a force directly below. 112 may be affected by bending or twisting due to a lateral load or a force acting in an oblique direction, and it may be difficult to accurately measure the load, and the vertical load is applied to the stage 104 side in the vertical direction. There is a possibility that the load cannot be transmitted well, and there is a high possibility that a good inspection accuracy cannot be obtained.

  That is, a plurality of weighing load cells 111, 112 having different weighings are arranged so as to be stacked one above the other, and at the same time, if each weighing load cell 111, 112 is always maintained in a good posture, it is possible to obtain a large weighing and extremely accurate. Compared with the case where a high load cell is used, the load cell unit can be configured at a relatively low cost, and an extremely high accuracy inspection can be performed. However, with this configuration, each load cell in a plurality of load cells can be placed in a stacking posture in which each load cell receives a load vertically, and can be placed so that it can be measured well by each load cell. Is a problem whether it can be loaded well on the stage side.

  The present invention solves the above problems, and when a load is applied, a plurality of weighing load cells having different weighings can be held in a stable posture, and high-precision inspection can be performed satisfactorily. An object of the present invention is to provide a possible weighing device.

  In order to solve the above-described problems, a weighing apparatus according to the present invention includes a support fixing frame fixed to a fixing unit in a posture straddling the upper side of an inspection table scale to be inspected, a mounting table of the inspection table scale, and a support fixing frame. A load generating device and a load cell unit for weighing arranged in series in a vertically aligned position with an upper part of the mounting table, and a plurality of load cells for weighing different from each other in the load cell unit, A state corresponding to each load cell for weighing, in a posture where each load cell for weighing is stacked in series in the vertical direction, and each load point where a load acts on the load cell for weighing overlaps in the vertical direction And a robust mechanism supported by the

  With this configuration, each load cell for weighing is stably supported by the Roverval mechanism in a posture in which the load points overlap in the vertical direction and are stacked in series in the vertical direction. When the applied load is applied to the load cell unit, each load cell can receive a good force in the vertical direction so that the load can be measured well, and the vertical force can be transmitted to the platform side well. Can do. That is, when a load is applied to the load cell unit, even if the load includes a non-vertical load such as a lateral load, bending, or torsion, the non-vertical load is received by the Roverval mechanism and is detected. Only the vertical load from which the non-vertical load is removed works well on the heavy load cell and can be measured with extremely high accuracy.

  Further, the present invention makes contact when a load that is larger than the weighing of the small weighing load cell in a plurality of weighing load cells is applied, and a load larger than the weighing acts on the thin-walled deformed portion of the small weighing load cell. A load transmitting portion serving as a stopper is provided that prevents the load and transmits the load from the support fixing frame side downward.

  With this configuration, even when a load larger than the weighing of the small weighing load cell is applied to the small weighing load cell, this load can be prevented from acting on the thin deformed portion of the small weighing load cell and being damaged, and the small weighing load cell can be prevented. The load acting on is transmitted downward through the load transmitting portion.

  Further, according to the present invention, a swing mechanism that swings so that a reaction force from the support fixing frame acts directly below is provided between the support fixing frame and the load generator or the load cell unit for weighing. Features.

  With this configuration, when a load, which is a reaction force from the support fixing frame, is received via the swing mechanism, the load from the support fixing frame is automatically adjusted so that it acts directly below the load cell unit. It can be accurately measured.

  Further, the present invention provides a plurality of sets of supporting and fixing frames, load generating devices and weighing load cell units, and the position of the mounting table at the time of instrumental error inspection at the position supported by the weighing load cell provided on the platform to be inspected. Each set is placed at the position of the platform so that the inclination angle is almost equal between when the load is applied by a plurality of load generators and when the weight is applied to the platform in a state of evenly distributed load. A load generator and a load cell unit for weighing are arranged.

  With this configuration, when a load is applied by a plurality of load generators of the inspection device at the time of instrumental error inspection, and when a weight is loaded on the platform in a state of evenly distributed load, it is supported by the weighing load cell. The tilt angle of the mounting table at the position is almost the same, and the weighing load cell can be weighed under conditions very close to those when a weight is used, thereby improving the measurement accuracy.

  Further, according to the present invention, the place where the weighing load cell is disposed on the foundation provided on the ground is constituted by a foundation block portion having a ground strength greater than the force acting on the weighing load cell corresponding to the weighing. A support fixing frame is fixed in the vicinity of the place where the measuring load cell is disposed in the section.

  With this configuration, the block portion having a ground strength that can sufficiently withstand the force acting on the weighing load cell can also be used as the fixing portion of the support fixing frame, and good reliability can be obtained. In addition, since the support fixing frame is disposed in the block portion in the vicinity of the measuring load cell, the moment acting on these portions can be kept small, and the base portion between them can be deformed or inclined. Thus, it is possible to suppress a decrease in inspection accuracy to a small extent.

  In addition, the present invention comprises a foundation block portion having a ground strength greater than the force acting on the weighing load cell corresponding to the weighing, where the weighing load cell is disposed on the foundation provided on the ground, and is supported to the foundation. The support leg portion of the fixed frame is configured in a forked shape so that it lies on both sides centering on the placement point of the weighing load cell provided on the platform to be inspected, and is erected in the foundation block portion. It is characterized by being fixed.

  Also according to this configuration, the block portion having a ground strength that can sufficiently withstand the force acting on the weighing load cell can be used also as the fixing portion of the support fixing frame, and good reliability can be obtained. In addition, since the place where the load cell for measuring the load acts on the foundation is positioned at the approximate center of the fixing part of the supporting and fixing frame where the upward force acts on the foundation from the supporting and fixing frame, these It is possible to prevent the inspection accuracy from deteriorating due to deformation or inclination of the base portion between the two.

  Further, the inspection method using the weighing apparatus according to the present invention includes a support fixing frame fixed to the fixing portion in a posture straddling the upper side of the inspection table scale to be inspected, a mounting table of the inspection table scale, and a mounting table in the support fixing frame A hydraulic cylinder device as a load generating device and a load cell unit for weighing that are arranged in series in a vertically aligned position with an upper portion of the load cell, and a plurality of weight measuring units different in weighing from each other. Load cell and each load cell corresponding to each weighing load, and each load point where the load is applied to the weighing load cell is in the vertical direction with the posture where each weighing load cell is stacked in series in the vertical direction Is an inspection method using a weighing device provided with a robust mechanism that is supported in a state where it is overlapped with a support fixed frame, a hydraulic cylinder device, and a load cell unit for weighing. The amount of protrusion of the retractable rod of the hydraulic cylinder device when the preliminary load is applied in advance and the preliminary load is applied from the state where the preliminary load is applied before the normal instrumental difference test is performed, or the platform The amount of deflection of the support fixing frame is detected, and whether or not the weighing device is properly installed is determined based on the correlation between the amount of protrusion or the amount of deflection and the load measurement value of the weighing device or the measurement value of the platform weight to be inspected. After performing the preliminary inspection to determine the value corresponding to the spring coefficient of the structure composed of the supporting and fixing frame, the weighing platform to be inspected, the hydraulic cylinder device as the load generating device, and the load cell unit for weighing, It is characterized by performing an instrumental error inspection.

  According to this inspection method for the weighing device, it is possible to determine whether or not the weighing device is properly installed at the time when a preload is applied in advance before the regular instrumental error test is performed, and whether the foundation has sufficient durability. It can be confirmed. Further, since an appropriate oil supply amount to the hydraulic cylinder device when performing a regular instrumental difference test can be set, the instrumental difference test can be performed well and efficiently.

  In addition, the method of assembling the weighing apparatus according to the present invention includes a support fixing frame fixed to the fixing unit in a posture straddling the upper side of the inspection table scale to be inspected, a mounting table of the inspection table scale, and a mounting table in the support fixing frame A load generator and a load cell unit for weighing that are arranged in series in a vertically aligned position with the upper part of the load, and a plurality of load cells for weighing different from each other in the load cell unit. It is arranged corresponding to the heavy load cell, and supports each weighing load cell in a posture in which the loading cells are stacked in series in the vertical direction, and each load point where a load acts on the weighing load cell is overlapped in the vertical direction. A method of assembling a gravimetric apparatus provided with a Roverval mechanism, wherein a plurality of Roverval mechanisms are arranged vertically using an assembly jig vertically installed with respect to the base of the load cell unit. After the assembly jig is removed from the Roverval mechanism, the load attachment body and the load cell for weighing are assembled to form a unit as a load cell unit in advance, and the support fixing frame is fixed at the time of inspection, and the support on the platform is supported. A weight measuring device is assembled by disposing the unitized load cell unit and load generating device between a fixed frame.

  According to this assembling method, the load cell unit can be unitized in advance in a state where a plurality of load cells for weighing are favorably supported by a plurality of robust mechanisms, and the load cell unit and the load generating device on the mounting base can be arranged efficiently. Can be done well.

  According to the present invention, a load generating device and a load cell unit for weighing are arranged side by side between a platform of a platform to be inspected and a support fixing frame, and the load cell unit includes a plurality of weighing units different from each other. Weighing load cell and a robotic mechanism that is arranged corresponding to each weighing load cell and supports each weighing load cell in a state where the loading cells are stacked in series in the vertical direction and the load points overlap in the vertical direction Since each load cell for weighing is stably supported by the Roverval mechanism in a posture in which the load points overlap in the vertical direction and are stacked in series in the vertical direction, load generation occurs. When the load generated by the device is applied to the load cell unit, the load is received well in the vertical direction by each load cell for weighing and can be measured well. It can be transmitted only good on the mounting base side, as a result, it is possible to stably perform highly precise inspection. In addition, the load cell unit can be configured at a low cost compared to the case of using one load cell with extremely high accuracy.

  In addition, when a load that is larger than the weighing of the small weighing load cell is applied in the plurality of load cells for weighing, the load larger than the weighing is prevented from acting on the thin deformation portion of the small weighing load cell, By providing a load transmitting portion that also serves as a stopper for transmitting the load from the side of the supporting and fixing frame in the vertical direction, there is no problem even when a load that is larger than the weighing of the small weighing load cell is applied.

  In addition, a swing mechanism that swings so that a reaction force from the support fixing frame acts directly below is provided between the support fixing frame and the load generator or the load cell unit for weighing. Measurement accuracy can be improved.

  In addition, a plurality of sets of support fixing frames, load generators and load cell units for weighing are provided, and the inclination angle of the mounting table at the time of instrumental error inspection at the position supported by the weighing load cell provided on the test table scale is Each set of load generating devices and the positions of the mounting bases that are substantially equal between when the load is applied by a plurality of load generating devices and when the weight is applied to the mounting base in a state of evenly distributed load By arranging the load cell unit for weighing, it is possible to measure with the load cell for measurement under conditions very close to the case of using the weight, and the measurement accuracy is improved.

  In addition, the place where the load cell for weighing is arranged on the ground provided on the ground is composed of a foundation block part that has a greater earth resistance than the force acting on the weighing load cell corresponding to the weighing, and is supported and fixed to this foundation block part By fixing the frame, the foundation block part with sufficient earth resistance that can sufficiently withstand the force acting on the load cell for measurement can also be used as the fixing part of the support fixing frame, and each has a large earth resistance. Good reliability can be obtained while the cost can be reduced compared with the case where the basic block portion is provided. In addition, in this foundation block part, the support fixing frame is arranged close to the place where the weighing load cell is arranged, so that the moment acting on these parts is kept small, and the part of the foundation between them is deformed or inclined. It is possible to suppress the decrease in inspection accuracy.

  In addition, the place where the load cell for weighing on the foundation provided on the ground is arranged is a foundation block portion having a ground strength greater than the force acting on the load cell for weighing corresponding to the weighing, and the support fixing frame supports the foundation. The leg portion is formed in a bifurcated shape so as to be on both sides around the placement point on the foundation of the weighing load cell provided on the platform to be inspected, and is fixed upright in the foundation block portion. Therefore, it is possible to use the foundation block part with sufficient earth resistance enough to withstand the force acting on the weighing load cell as the fixing part of the support fixing frame, and to obtain good reliability. Since the place where the load cell for measuring the load acts downward on the foundation is located at the approximate center of the fixing part of the supporting and fixing frame where an upward force acts on the foundation from the support and fixing frame, this It can be prevented that part of the foundation is deformed or inclined or in inspection accuracy between decreases, thereby improving the safety.

  In addition, with the support fixing frame, hydraulic cylinder device, and load cell unit for weighing being measured, the preliminary load is applied in advance before the normal instrumental error test is performed, and the preliminary load is applied from the state where the preliminary load is not applied. The amount of protrusion of the retractable rod of the hydraulic cylinder device or the amount of deflection of the mounting base and the support fixing frame when it is applied is detected, and the amount of protrusion or deflection and the load measurement value of the weighing device or the inspection target Based on the correlation with the measurement value of the platform scale, the suitability of the weighing apparatus is determined as appropriate, and the supporting and fixing frame, the platform scale to be inspected, the hydraulic cylinder apparatus as the load generating apparatus, the load cell unit for the weighing, After performing a preliminary inspection to obtain a value corresponding to the spring coefficient of the structure consisting of In, or to determine the appropriateness of the mounting condition of the biopsy heavy device, it can check the durability of the foundation is sufficient, the reliability is improved. Further, since an appropriate oil supply amount to the hydraulic cylinder device when performing a regular instrumental difference test can be set, the instrumental difference test can be performed well and efficiently.

  Also, a plurality of Roverval mechanisms were assembled in an up-and-down orientation using an assembly jig that was erected vertically with respect to the base of the load cell unit, and the assembly jig was removed from the Roverval mechanism. A load cell and a load cell for weighing are later assembled into a unit as a load cell unit, the support fixing frame is fixed at the time of inspection, and the unitized load cell unit and load generating device are provided between the support fixing frame on the mounting table. The load cell unit can be unitized in advance in a state where a plurality of load cells for weighing are satisfactorily supported by a plurality of robust mechanisms by assembling the weighing device by arranging the load cell unit and load generation on the platform. The apparatus can be arranged efficiently.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic plan view of a track scale (an example of a large platform scale to be inspected) in which a weighing apparatus according to an embodiment of the present invention is arranged, and FIGS. 2 (a) and 2 (b) are the same. FIG. 3 is a schematic side cross-sectional view and main part side cross-sectional view of the track scale, and FIG. 3 is a front view of the track scale.

  As shown in FIGS. 1 to 3, in this embodiment, the table scale 5 to be inspected is a track scale, and the track scale of this embodiment is a so-called ground-mounted type. (Pitless type that does not require deep pits in the basement). And between the slope parts 7 made from concrete which became a pair, the planar view rectangular shape mounted on the foundation 1 as a fixing | fixed part via the load cell 3 for measurement (4 in this Embodiment) is used. It is arrange | positioned so that the mounting base 4 may be located. The foundation 1 is a foundation block portion 1a embedded at a position corresponding to the lower part of both ends in the longitudinal direction of the mounting table 4 so as to have a sufficient earth strength by digging the ground 6 slightly adjacent to the slope portion 7. And a basic planar portion 1b embedded in the ground by being dug shallowly so as to connect the basic block portions 1a in plan view. The weighing load cell 3 is placed on the base block portion 1a, and the four corners of the mounting table 4 are supported by these four load cells 3. In addition, the foundation block part 1a is provided with sufficient ground strength for supporting the load from the mounting base 4. Reference numeral 8 in FIG. 1 and the like is a position restricting stopper that restricts the platform 4 from excessively moving in the lateral direction.

  In this embodiment, the main girder portion 4a is disposed so as to extend upward at the end portions extending along the longitudinal direction at both end portions in the width direction of the mounting base 4, and the main girder portion 4a is a track. It also functions as a guard that regulates the traveling area of the vehicle. The platform 5 to be inspected is, for example, a track scale having a maximum measurement load of 40 t, and a vehicle (measuring object) such as a truck is placed on the platform 4 during measurement. Further, in this embodiment, the case where the four corners of the mounting table 4 are supported by the four load cells 3 for weighing is not limited to this. For example, the longitudinal direction of the mounting table 4 is illustrated. It may further include left and right load cells 3 that support the central portion with respect to (that is, a configuration in which six platforms 4 are supported by a total of six load cells 3 for weighing). Moreover, 1c, 1d, and 7a in FIG. 2 are interposed between the foundation block portion 1a and the installation surface, between the foundation bottom surface portion 1b and the installation surface, and between the slope portion 7 and the installation surface, respectively. It is the bottom board. Further, in the following description, when simply referred to as “longitudinal direction”, it means the direction along the longitudinal direction of the stage 4, and when simply referred to as “width direction”, It shall mean a direction along the width direction.

  The weighing apparatus 10 for inspecting the table 5 to be inspected is fixed to the foundation 1 as a fixing unit through fixing bolts (not shown) such as anchor bolts in a posture straddling the upper side of the table 5 to be inspected. As a load-generating device disposed in a vertically arranged state between the gate-shaped support and fixing frame 12, the upper frame 12 a of the support and fixing frame 12, and the mounting table 4 of the platform 5 to be inspected. It comprises a hydraulic cylinder device 13 and a load cell unit 14 for weighing (inspection). Note that both ends of the support fixing frame 12 are placed on the base block portion 1a via the installation block portion 12d, and extend in the longitudinal direction outside the main girder portion 6 of the mount 4 in plan view. The base frame 12b arranged so as to extend in the width direction, the support column portion 12c erected from two predetermined locations on each base frame 12b, and the upper end portions of the support column portion 12c in the width direction so as to be connected to each other The upper frame 12a extends. In this embodiment, installation block portions 12d are provided at both ends of the base frame 12b of the support fixing frame 12, and the support fixing frame 12 is attached to the support fixing frames 12 by the installation block portions 12d provided at both ends thereof. I support it. And the arrangement | positioning location of the installation block part 12d which is a fixed part of the support fixing frame 12 to this foundation 1 is on the foundation block part 1a with which the load cell 3 for measurement provided in the to-be-inspected table scale 5 is arrange | positioned. Therefore, it is in the vicinity of the place where the load cell 3 is disposed. In general, the installation block 12d and the base frame 12b are permanently installed, and the support column 12c and the upper frame 12a are attached only at the time of inspection. In addition, you may install the support | pillar part 12c permanently.

  Further, the hydraulic cylinder device 13 and the load cell unit 14 of the weighing apparatus 10 are respectively divided into two regions in the longitudinal direction between the weighing load cells 3 of the mounting table 4 of the platform 5 to be inspected. The supporting and fixing frames 12 are respectively arranged at positions slightly closer to the both ends than the center (detailed positions will be described later), and the supporting and fixing frames 12 respectively correspond to the hydraulic cylinder device 13 and the load cell unit 14. 5 is arranged in a posture straddling the upper side along the width direction (vertical direction on the paper surface of FIG. 1). In the following, a portion where the hydraulic cylinder device 13 and the load cell unit 14 are provided corresponding to the upper frame 12a of the support fixing frame 12 is referred to as a weighing unit 11, and in this embodiment, two detection units are used. The heavy measuring unit 10 is constituted by the heavy unit 11 and the support fixing frame 12. FIG. 3 shows a state in which no hydraulic pressure is applied to the hydraulic cylinder device 13 (that is, a state in which no load is applied).

  As shown in FIGS. 2B and 3, in each weighing unit 11, a load receiving base 41 extending along the width direction is placed on the platform 4, and the load receiving base 41 is interposed through the load receiving base 41. The load cell unit 14 is mounted on the mounting table 4, and the hydraulic cylinder device 13 as a load generating device is mounted thereon in a posture arranged in series in the vertical direction. Further, a swing mechanism 15 for transmitting a force in the vertical direction is placed above the hydraulic cylinder device 13, and the upper end portion of the swing mechanism 15 is provided at the center in the width direction of the upper frame 12 a of the support fixing frame 12. The contacted portion 12f (see FIG. 3) is disposed so as to contact from below.

  As shown in FIGS. 4 to 7, the load cell unit 14 provided in the weighing unit 11 is arranged corresponding to two weighing load cells 16, 17 having different weighings, and corresponding to each weighing load cell 16, 17. The load points (the upper mounting body 24 and the load cell 17 (to be described later)) in which the load is applied to the load cells 16 and 17 in a posture in which the load cells for weight measurement are arranged in series in the vertical direction. The spherical portion 17b) comes into contact with the load and the load is applied to the weighing load cell 17, and the intermediate mounting body 23 and the weighing load cell 16 (the spherical portion 16b), which will be described later, come into contact with the weighing load cell 16. The so-called Roverval mechanism 18, 19 having thin deformed portions 18a, 19a and a bottom surface portion of the weighing unit 11 are supported in a state where the load acts on the vertical direction. And to base 20, and is configured to include a like outer frame portion 21 forming the other rectangular extracorporeal shell portion of the test weight unit 11.

  Specifically, a substantially cylindrical lower mounting body 22 is fitted into a mounting recess 20b formed at the center of the base 20 (see FIG. 8) with almost no gap, and is further attached to the lower mounting body 22. A large weight (for example, 25 t) of the weighing load cell 16 is disposed on the lower side of the load cell unit 14 in a state where the lower end portion of the recessed portion 22a is fitted and placed with a margin. The mounting recess 20b of the base 20 is processed so that the bottom surface of the mounting recess 20b is also satisfactorily horizontal when the base 20 is placed on a horizontal plane.

  Further, a substantially cylindrical intermediate mounting body 23 is fitted and mounted on the upper end portion of the large-scale weighing load cell 16, and the lower end portion of the intermediate mounting body 23 has a margin. In a state of being fitted and placed, a small weighing (for example, 10 t) weighing load cell 17 is disposed on the upper side of the load cell unit 14, and a substantially cylindrical shape is formed at the upper end of the small weighing weighing cell 17. The upper mounting body 24 is fitted and mounted with a margin. In addition, an O-ring is fitted in each fitting inner peripheral portion of the weighing load cells 16 and 17 in each of the attachment bodies 22 to 24, and a vent hole is appropriately formed so that the inside is not sealed.

  On a support portion 20a provided at one end of the base 20, a downwardly mounted Roverval mechanism (also referred to as a lower Roverval mechanism: see FIG. 9) 18 is fixed with a bolt 26 as a coupling means on the lower side of the fixing portion. Has been. Further, a fixing intermediate member (spacer) 27 is placed on the upper side of the fixing portion of the lower roval mechanism 18, and is disposed above and below the lower roval mechanism 18 via the fixing intermediate member 27. A Roverval mechanism (also referred to as an upper Roverval mechanism: see FIG. 10) 19 is fixed so as to be integrated by a bolt 28 as a coupling means. Further, only the movable side upper sides of the respective roval mechanisms 18 and 19 are extended in the longitudinal direction of the beam, and through-holes 18c vertically passing through these extended portions (referred to as movable side extensions) 18b and 19b, 19c is formed. The through holes 18c and 19c and the mounting recess 20b of the base 20 are formed to have the same diameter, and are arranged at the same position in plan view.

  The intermediate mounting body 23 is fitted in the through hole 18c of the movable side extension 18b of the lower Roverval mechanism 18 with almost no gap, and the through hole 19c of the movable side extension 19b of the upper Roverval mechanism 19 is inserted. The upper mounting body 24 is fitted with almost no gap. As a result, the load cells 16 and 17 for weighing are supported in a posture in which the load cells 16 and 17 are arranged in series in the vertical direction and the positions of the load points of the load cells 16 and 17 for weight measurement are vertically regulated. ing.

  In addition, the auxiliary clamping body 29 is coupled to the movable side extension 18b of the lower roval mechanism 18 by a bolt (not shown) in a state where the auxiliary clamping body 29 is put on the large diameter portion of the intermediate mounting body 23 from above. As a result, the intermediate attachment body 23 is fixed in the vertical direction with respect to the movable side extension 18b of the lower roval mechanism 18 as well. In addition, an auxiliary connecting member 30 fixed to the lower end portion of the hydraulic cylinder device 13 with a bolt (not shown) is applied to the upper mounting body 24 with the large-diameter portion of the upper mounting body 24 covered from above. The upper mounting body 24 is fixed to the movable side extension portion 19b of the upper rovalval mechanism 19 in a position-controlled manner in the vertical direction. Further, each of the robust mechanisms 18 and 19 has a wide width so that the position can be satisfactorily corrected to the normal posture when each of the attachment bodies 22 to 24 receives a force in the twisting direction.

  Further, in this embodiment, the large-scale weighing load cell 16 disposed on the lower side uses a strain gauge (not shown) attached to a rocker pin type strain body, Spherical surface portions 16 a and 16 b are formed at the upper and lower ends extending vertically, and the spherical surface portions 16 a and 16 b are in contact with the lower attachment body 22 and the intermediate attachment body 23 in the vertical direction. In addition, a small-weight weighing load cell 17 disposed on the upper side has a flat hole 17c (see FIG. 7) that is flat in the lateral direction in the center and is formed in a thin deformed portion 17h that is hollowed out in a circular shape. The one having the strain gauge 17f attached thereto is used, and spherical portions 17a and 17b are formed at upper and lower ends extending vertically, respectively, and these spherical portions 17a and 17b are formed by the intermediate attachment body 23 and the upper attachment body. 24 in a vertical direction.

  Further, in particular, a stopper body 42 as a load transmitting portion serving also as a stopper is detachably attached to the small-weight weighing load cell 17 in the flat hole 17c. In this embodiment, the stopper body 42 has a flat hole in the flat hole 17c of the weighing load cell 17 in such a posture as to straddle the left and right brackets 25 attached to the lower side surface of the weighing load cell 17 by screws 25a or the like. It is mounted in a posture that is placed on the lower wall portion of 17c and protrudes upward (reversely, it may be arranged in a posture that protrudes downward from the upper wall portion of flat hole 17c). When an excessive load is applied to the weighing load cell 17 (10 t), the upper wall portion 17 g facing the flat hole 17 c of the small weighing load cell 17 comes into contact with the upper end of the stopper body 42. Thus, a load larger than the weighing is prevented from acting on the thin deformed portion 17h of the load cell 17 for weighing and being damaged, and the contacted portion 12f (see FIG. 3) side of the support fixing frame 12 (this embodiment) In the embodiment, the load acting from the hydraulic cylinder device 13) is transmitted to the lower intermediate mounting body 23 side.

  As shown in FIGS. 4, 5, 11, and 12, the hydraulic cylinder device 13 is provided with a hydraulic tip fitting 31 having a spherical upper portion at the tip of a retractable rod 13b that can be moved up and down from the cylinder body 13a. The spherical portion of the hydraulic tip metal fitting 31 is attached to a contact block 32 provided in the swing mechanism 15 and having a substantially tridental shape in plan view from below. A plurality of (three in this embodiment) spherical seats 33 are attached to the upper part of the abutment block 32, and a rectangular frame-shaped connecting bracket that is vertically long via a sphere 34 placed on the spherical seat 33. A spherical seat 36 attached to the upper part of 35 is abutted, and a spherical seat 37 having a spherical concave portion provided on the upper surface is also attached to the lower part of the coupling fitting 35, and a sphere 38 placed on the spherical seat 37. The spherical seat 39 attached to the lower part of the holding member 40 provided on the outer peripheral side of the swinging mechanism 15 is in contact with each other. The contact portion 40a attached to the upper portion of the holding member 40 is provided on the lower surface of the central portion of the upper frame 12a of the support fixing frame 12 when the retracting rod 13b of the hydraulic cylinder device 13 protrudes upward. The contact portion 12f is in contact with the contact portion 12f to transmit the force.

  In general, the holding member 40 has a configuration in which an upper disk-shaped portion 40b and a lower annular portion 40c are connected and integrated by a plurality of connecting rods 40d extending vertically. The hydraulic cylinder device 13 is configured to receive the reaction force from the side of the support fixing frame 12 directly through the swing mechanism 15.

  Further, as shown in FIG. 13 simply, the surface of the foundation 1 is provided with a foundation inclination sensor 45 for monitoring that the surface of the foundation 1 is deformed and inclined during the inspection. In this embodiment, the foundation inclination sensor 45 is provided on the foundation block 1a where the installation block 12d of the load cell 3 and the support fixing frame 12 is installed. In other words, during the inspection, a load acts downward from the mounting table 4 through the load cell 3 for measurement, and at the same time, the pressure of the hydraulic cylinder device 13 tries to pull up through the support fixing frame 12. Since the force acts, it is monitored that the foundation 1 to which the support fixing frame 12 is fixed (for example, the installation block portion 12d of the support fixing frame 12 and the vicinity of the load cell 3 as in this embodiment) is tilted. Thus, when it is detected that the vehicle has tilted more than a predetermined angle, the alarm device 51 of the control unit 50 provided in the weighing device 10 is configured to emit an alarm sound or display an alarm.

  Further, as simply shown in FIG. 13, the contact portion 12 f of the upper frame 12 a of the support fixing frame 12 to which the force from the support fixing frame 12, for example, the hydraulic cylinder device 13 is transmitted via the swing mechanism 15. A supporting and fixing frame inclination sensor 46 for monitoring that the supporting and fixing frame 12 is deformed and inclined during inspection is also provided in the vicinity. The support fixing frame inclination sensor 46 is also used at the time of preliminary loading in which a load is applied in advance before actual inspection. 13, 47 is a horizontal movement monitoring sensor for monitoring the movement of the mounting table 4 in a horizontal plane during inspection and the like, and 48 is a table balance 5 to be inspected for displaying a load measured by the table scale 5 to be inspected. It is an indicator.

  As shown in FIG. 13, in the present embodiment, an electric pump 52a having a large discharge amount (or a manual pump) and a manual pump 52b having a small discharge amount are used as the hydraulic unit 52 that loads the hydraulic cylinder device 13 with hydraulic pressure. The electric pump 52 a is configured to be refueled according to an instruction from the pump drive instruction unit 53 of the control unit 50, and to be able to adjust the supply amount by the control unit 50. Further, it is configured to be able to supply oil manually from the manual pump 52b for fine adjustment. In addition, output data from the load cells 16 and 17 provided in each weighing unit 11 is input to the first and second indicators 54 a and 54 b, and the total value of these is input to the control unit 50 of the weighing device 10. It is displayed on the indicator 55 provided. Further, in this embodiment, one weighing unit 11 is provided with a minute load generator 60 that generates a minute load to be applied to the table scale 5 (this minute load generator 60 includes: (It also has a drive motor that adjusts the minute load and a load cell that measures the generated minute load), and uses the hydraulic cylinder device 13 as a load generating device to generate a load close to the target load for inspection, Thereafter, a minute load is generated by the minute load generator 60 so that a load strictly matching the target load is applied.

  Here, the control unit 50 applies a load corresponding to the difference between the total load value of each weighing unit 11 and the target value in accordance with the input value of the operation unit 58 that also performs setting of the target value and the like. Then, the correction calculation control unit 56 controls the drive motor of the minute load generator 60 so that the final load value becomes the target load.

  Further, in the present invention, in particular, the inclination angle of the mounting table 4 at the time of instrumental error inspection at the position supported by a plurality of (four in this embodiment) weighing load cells 3 provided on the inspection table scale 5 is as follows. The case where a load is applied by a plurality (two in this embodiment) of the hydraulic cylinder device 13 and the case where the weight is loaded on the platform 4 in a state of evenly distributed load are substantially equal. Each set of weighing units 11 is arranged at the position of the mounting table 4.

That is, in the conventional instrumental difference inspection using weights, a plurality of weights are sequentially placed from the center of the stage 4 so as to be added to the both ends of the longitudinal direction of the stage 4 so as to be equally distributed. As schematically shown in FIG. 14 (a), when the weight is reached, the weight is placed on the platform 4 so as to have an equally distributed load, and the instrumental difference inspection is performed. Therefore, in the present embodiment, the weighing load is regarded as an equally distributed load in the range between the supporting points R ₁ and R _{2 in} the weighing load cell 3 (the dimension range A in FIG. 14A). Thus, the inclination angle of the mounting table 4 with respect to the load cell 3 for weighing at this time is the same as the inclination angle of the mounting table 4 with respect to the load cell 3 for measuring when the weighing device 10 according to the present embodiment is used. Thus, the arrangement position of each weighing unit 11 is determined. Thereby, it can measure with the load cell 3 for measurement on the conditions very close to the case where a weight is used, a measurement precision improves and reliability improves.

14 (a) and 14 (b), W is a load, E is a Young's modulus, I is a cross-sectional secondary moment about the axis of the neutral plane, and R ₁ and R ₂ are provided with a load cell 3 for measurement. The positions L ₁ and L ₂ are the distances from the weighing load cell 3 of each weighing unit 11 (therefore, L ₁ + L ₂ = A).

In this embodiment, two weighing units 11 are provided, and a concentrated load P (= W / 2) that is half of the weighing weight W acts on the point where the two weighing units 11 are placed. Will be. Therefore, the inclination angles (for example, the inclination angle i (R ₁ ) of the pedestal 4 at the point R ₁₎ when the equally distributed load is applied as described above and when the concentrated load is applied to the two points are as follows. By calculating as equal, the position where the weighing unit 11 should be disposed can be determined. That may be calculated as the inclination angle at the support points _{R 1, R 2} shown in FIG. 14 (a), and the inclination angle at the support points _{R 1, R 2} shown in FIG. 14 (b) equal. For example, when the distance A between the weighing load cells 3 is 9 m, the position where the distance B between the weighing units 11 is about 5.2 m (positions 1.9 m away from the weighing load cell 3 respectively) That is, the distance between the load cells 3 for measurement is closer to each load cell 3 than the position obtained by dividing the distance between the load cells 3 into four.

  Further, the control unit 50 indicates the value measured by the load cell 17 of the small scale that can measure the load with a small scale within this range as the measurement value of the weighing device 10 within the inspection range (within 20 t). A total of 55 is displayed. On the other hand, in the range of the large scale larger than the small scale (when exceeding 20 t), the value measured by the large scale load cell 16 with a large scale is switched and inputted as the measured value of the weighing device 10 and displayed on the indicator 55 To do.

Here, the assembly work of the load cell unit 14 provided in each weighing unit 11 is performed as follows.
First, the base 20 is placed substantially horizontally, the lower Roverval mechanism 18 is placed on the support portion 20 a of the base 20, and the fixed portion side is connected by the bolt 26. In addition, a fixing intermediate member 27 is mounted on the lower Roverval mechanism 18, and the upper Roverval mechanism 19 is mounted via the fixing intermediate member 27, and these are connected by bolts 28. In this case, the bolts 26 and 28 are loosely connected so that the lower and upper rubber mechanisms 18 and 19 can move slightly in the horizontal plane.

  Next, a guide rod composed of a bar-shaped assembly jig extending linearly up and down is inserted into both the through holes 18c and 19c of the movable side extensions 18b and 19b of the Roverval mechanisms 18 and 19, and the base 20 is erected on the mounting recess 20b. Then, the guide rod 40 is erected so as to be in a vertical posture with respect to the plane 20c. Here, the plane 20c is machined to form one plane. As a result, the Roverval mechanisms 18 and 19 can be adjusted so as to have a proper posture arranged in the vertical direction. In this state, the bolts 26 and 28 are tightened to fix the positions of the Roverval mechanisms 18 and 19.

  Thereafter, the guide rod 40 is pulled out and taken out from the through holes 18c, 19c of the rovalval mechanisms 18, 19, and then the lower mounting body 22 is assembled into the mounting recess 20b of the base 20, and the lower mounting body 22 is mounted on the lower mounting body 22. The weighing cell 16 for weighing is placed. Further, the intermediate attachment body 23 is inserted into the through hole 18 c of the lower roval mechanism 18 from above and set on the weighing load cell 16. Then, the auxiliary attachment body 29 is fitted around the intermediate attachment body 23, and the auxiliary attachment body 29 is fixed to the movable side extension 18 b of the lower Roverval mechanism 18 with a bolt (not shown). In this way, first, a large-scale weighing load cell 16 disposed on the lower side is set.

  Next, a small-weight weighing load cell 17 is placed on the intermediate mounting body 23, and an upper mounting body 24 is inserted into the through-hole 19 c of the upper roval mechanism 19 from above to be placed on the weighing load cell 17. Put it on. Further, the auxiliary mounting member 30 is fitted on the upper mounting body 24, and the auxiliary mounting member 30 is fixed to the movable side extension 19b of the upper roval mechanism 19 with a bolt (not shown). Thereafter, the outer frame portion 21 forming the rectangular outer shell portion of the weighing unit 11 is attached.

  As a result, the load cell unit 14 formed by assembling the Roverval mechanism 18, 19 and the load cell 16, 17 for weighing, the mounting bodies 22-24, etc. on the base 20 in a good posture and relatively simple. Can be assembled efficiently at work.

  In the above configuration, when the inspection (instrument difference test) is performed, the support column 12c and the upper frame 12a are attached to the base frame 12b of the support fixing frame 12 that is permanently installed. Further, with the weighing unit 11 not placed on the platform 4, a level or the like is placed on the platform 4 or the load receiving base 41 to confirm that the platform 4 is maintained in a horizontal posture. After that, the unitized load cell unit 14 is mounted on the load receiving base 41, the hydraulic cylinder device 13 is disposed and fixed on the auxiliary mounting member 30, and the swing mechanism 15 is further disposed. By doing so, as shown in FIGS. 1 to 3, the support fixing frame 12 and the weighing unit 11 are assembled.

  Then, in this assembled state, an operation unit 58 (see FIG. 13) provided in the control unit 50 is operated to drive the electric pump 52a, or the manual pump 52b is used to apply a preliminary load in advance. In this case, when a hydraulic pressure is applied to the hydraulic cylinder device 13, the load 4 acts on the load cell unit 14 and the mount 4 while the mount 4 and the support fixing frame 12 bend accordingly. The amount of bending of the mounting table 4 and the support fixing frame 12 differs depending on the area, structure, etc., and the sum of the bending amount of the mounting table 4 (load receiving base 41) and the bending amount of the support fixing frame 12 at this time is the hydraulic pressure. Measured by regarding the amount of protrusion of the retracting rod 13b of the cylinder device 13 as a measure, and based on the correlation between this result and the measured load value of the weighing device 10 or the measured value of the table balance 5 to be inspected. 10 is roughly determined as to whether or not the installation state is appropriate, and values corresponding to the spring coefficients of these structures are obtained, and the amount of oil supplied by the electric pump 52a when performing a regular instrumental error test is appropriately determined. (Appropriate for manual pumps) Do not view the supply amount). Here, the amount of bending of the mounting table 4 is, for example, a scale formed on the retracting rod 13b of the hydraulic cylinder device 13 so that the protruding amount protruding from the main body 13a of the hydraulic cylinder device 13 can be measured. Although it is good to estimate from the protrusion amount of the rod 13b, it may replace with this and may comprise so that a sensor etc. which measure distortion amount may be provided and measured automatically. At this time, if the load measurement value of the weighing apparatus 10 and the measurement value of the inspection table scale 5 are greatly different, it can be predicted that the weighing apparatus 10 or the inspection table scale 5 is abnormal.

  Thereafter, the hydraulic cylinder device 13 is driven to apply a hydraulic pressure to the hydraulic cylinder device 13 to a load up to a predetermined set target load. In the case where the minute load generating device 60 is provided, the hydraulic cylinder device 13 is loaded with hydraulic pressure, loaded to the vicinity of a predetermined set target load, and then the minute load generating device 60 is operated. Load is applied so that the total value is exactly the set target load. By doing in this way, it is possible to determine (confirm) whether the weighing apparatus is operating normally at the time of the preliminary load, and by appropriately setting the oil supply amount by the electric pump 52a, It is possible to shorten the work time when applying the hydraulic pressure during the main inspection, and to improve the work efficiency.

  Then, in a state where the load is strictly matched to a predetermined target load, the measured load measured by the load cell unit 14 is compared with the measured load of the table balance 5 to be inspected, for example, the predetermined load (for example, 15.000 t, The inspection is performed at 20.000 t, up to 40 t at 5.000 t intervals.

  In this case, since the two load cells 16 and 17 having different weighings are arranged in a vertically stacked state and with the respective load points overlapping in the vertical direction, the measurement accuracy within the small weighing range is set. In addition, the load cell unit 14 can be configured at a relatively low cost as compared with the case of using a load cell with a large scale and extremely high accuracy. In other words, when using a single load cell with large scale and small scale and extremely high accuracy, although there is only one load cell, it becomes very expensive because high manufacturing accuracy is required. However, as in the present invention, two load cells 16 and 17 having different weighings are arranged in series in the vertical direction, and within a small weighing range, By using the load cell 17 with a small scale and a small scale, while using a relatively inexpensive load cell, a measurement with a small scale can be stably performed within the small scale range, and a single load cell with high accuracy is used. It can be configured at a lower cost than the case.

  In addition, according to the present embodiment, the load cells 16 and 17 for weighing are respectively provided with corresponding load mechanism 16 and 17 so that their load points overlap in the vertical direction and are connected in series in the vertical direction. Since it is stably supported in a stacked posture, when a load generated by the hydraulic cylinder device 13 serving as a load generating device acts on the load cell unit 14, a bending load caused by a lateral load or a force acting in an oblique direction can be obtained. The influence of torsion can be minimized, and each load cell 16, 17 can measure the load with good force in the vertical direction, and can measure the force in the vertical direction well. As a result, high-precision inspection can be performed stably. That is, when a load is applied to the load cell unit 14, even if it is assumed that the load includes a non-vertical load such as a lateral load, bending or twisting, the non-vertical load is applied by the Roverval mechanism 18, 19. As a result, only the vertical load from which the non-vertical load is removed works well on the load cells 16 and 17 for weighing, and can be measured with extremely high accuracy.

  Further, a plurality of spherical seats 33, 36, 37, 39 and spheres (steel balls) 34, 38 are provided between the contact portion 12 f (see FIG. 3) of the support fixing frame 12 and the hydraulic cylinder device 13. Since the swing mechanism 15 that swings so that the reaction force from the support fixing frame 12 acts directly below is provided, when the load that is the reaction force from the support fixing frame 12 is received, the support mechanism 15 is supported. The load from the fixed frame 12 is automatically adjusted so that it acts directly below the hydraulic cylinder device 13, and as a result, the load cell unit 14 can measure the load more accurately.

  In addition, the inclination angle of the mounting table 4 at the time of the instrumental error inspection at the position supported by the weighing load cell 3 provided on the platform 5 to be inspected causes a load to be applied by the hydraulic cylinder device 13 as a load generating device. In this case, the hydraulic cylinder device 13 and the load cell unit 14 for weighing are disposed at the positions of the mounting table 4 that are almost equal between the case where the weight is applied to the mounting table 4 in a state of evenly distributed load. When the weight is used at the time of the instrumental difference inspection, the inclination angle of the mounting table 4 is substantially equal, and the weighing load cell 3 can be weighed under the same conditions as when the weight is used, and the measurement accuracy is improved. In other words, when the weighing is loaded, the mounting table 4 is deformed so that the center is depressed in the arcuate shape at the lowest position. In this case, the weighing load cell 3 depends on the inclination angle of the mounting table 4. Since it will also be inclined from the vertical state, there is a tendency to reduce the measurement load, but it is possible to realize the same situation as when using a weight by configuring as described above, It is possible to perform measurement with the same inspection status and high accuracy, thereby further improving the inspection accuracy.

  The inspection of the platform 5 to be inspected includes a two-corner inspection. In this case, a weight having a mass that is 1/2 of the weight of the weighing platform 3 is placed between the center position in the longitudinal direction of the platform 4 and the weighing load cell 3 on one side. (For example, equidistributed between the center position in the longitudinal direction of the table 4 and the supporting point of the weighing load cell 3 on one side) Therefore, the state of the distributed load in this case and the inclination angle of the stage 4 when a concentrated load is applied by the weighing device are slightly different. However, in this case, since the load is 1/2 of the weighing, the inclination angle of the mounting table 4 at the supporting point of the weighing load cell 3 is smaller than that at the time of the instrumental error inspection for loading the weighing, Inspection accuracy is less affected than instrumental inspection.

  Moreover, in the said structure, the location which arrange | positions the load cell 3 for measurement in the foundation 1 provided in the ground is larger than the force which acts on the load cell 3 for measurement corresponding to weighing, and the foundation block part which has sufficient ground strength 1a, and by fixing the installation block portion 12d of the support fixing frame 12 to the foundation block portion 1a, the foundation block portion 1a having sufficient earth resistance capable of withstanding the force acting on the weighing load cell 3 is supported and fixed. It can also be used as a fixing part of the frame 12 and can be inexpensively compared with the case where a foundation block part having a large earth bearing strength is provided separately, and good reliability can be obtained. . In addition, in this foundation block portion 1a, the support fixing frame 12 is disposed on the foundation block portion 1a and in the vicinity of the location where the measuring load cell 3 is disposed, so that the moment acting on these portions is kept small. Therefore, it is possible to suppress a slight decrease in inspection accuracy due to deformation or inclination of the portion of the foundation 1 between them.

  Moreover, in the said embodiment, since the surface of the foundation 1 is provided with the foundation inclination sensor 45 for monitoring that the surface of the foundation 1 is deformed and inclined during the inspection, Even when the surface is deformed and starts to tilt, this situation is detected by the basic tilt sensor 45, and an alarm sound is generated or an alarm display is made in the alarm device 51 of the control unit 50 provided in the inspection device. As a result, safety is ensured.

  Further, the support fixing frame 12 is also deformed and inclined during inspection at a location near the contact portion 12f of the upper frame 12a of the support fixing frame 12 to which the force from the hydraulic cylinder device 13 is transmitted via the swing mechanism 15. Since the support fixing frame inclination sensor 46 is provided for monitoring the operation, the amount of deformation (inclination) of the support fixing frame 12 is monitored by the support fixing frame inclination sensor 46 even during a nominal load or during inspection. While being able to perform inspections well and safely.

  However, in the above-described configuration, the placement location of the weighing load cell 3 where the load acts on the foundation 1 downward, and the securing location of the support fixing frame 12 where the upward force acts on the foundation 1 (installation block portion 12d). Are located close to each other, but in these locations, force acts in the opposite direction, so a moment acts between them, and the portion of the foundation 1 is deformed or tilted. There is a fear.

  Moreover, in the said structure, the installation block part 12d and the base frame 12b for fixing the support fixing frame 12 are the load cell 3 for a measurement, the foundation 1 (both sides of the foundation block part 1a and the foundation plane part 1b), mounting. Since these members are permanently installed near both sides of the base 4, it is difficult to see the location of the weighing load cell 3 due to these members, and it becomes difficult to manage the weighing load cell 3, or the foundation block portion 1a and the foundation. Even when dust collects on both sides of the planar portion 1b, it may be difficult to perform cleaning.

  As another embodiment of the present invention for coping with this, as shown in FIGS. 15A and 15B, a portion of the support leg 12g of the support fixing frame 12 to the foundation 1 is provided in the platform 5 to be examined. The measuring load cell 3 has a bifurcated shape so as to be on both sides with the arrangement point on the foundation 1 as the center. In addition, 12h in FIG.15 (b) is a leg connection part which connects the upper end parts of the bifurcated support leg 12g, 12i is a connection frame extended in a longitudinal direction and connecting the leg connection parts 12h.

  According to this configuration, the support legs 12g of the support fixing frame 12 are arranged in a bifurcated manner so as to lie on both sides in the longitudinal direction around the installation point of the weighing load cell 3 on the foundation 1. Therefore, as indicated by an arrow in FIG. 15 (b), a load F1 that presses downward acts on the placement location of the weighing load cell 3 on the foundation 1, and the point where this load F1 acts is the center. On both sides, forces F2 and F3, which are about half the size of the load F1, are applied to the foundation 1 with upward forces. As a result, the moments acting on the foundation 1 cancel each other out, so that the portion of the foundation 1 can be minimized from being deformed or inclined.

  Further, by making the support leg 12g into a bifurcated shape, the connection frame 12i is disposed at a high position away from the foundation 1, thereby preventing the weighing load cell 3 from becoming difficult to see. In addition, the weighing load cell 3 can be easily managed, and cleaning can be easily performed even when dust accumulates on both sides of the basic block portion 1a and the basic planar portion 1b.

  In each of the above embodiments, the case where the track scale as the platform 5 to be inspected is a so-called ground installation type (a pitless type in which it is not necessary to provide a deep pit in the basement) has been described. Instead, as shown in FIGS. 16 and 17, it is needless to say that the present invention can also be applied to a base 1 in which deep pits 1 f are formed by the bottom wall 1 h and the side wall 1 g. Note that reference numeral 42 in FIG. 17 denotes a mounting support frame that supports the mounting 4.

  In the above-described embodiment, the load cell unit 14 is provided with the large-scale weighing load cell 16 and the small-weighing weighing load cell 17 that are different in weighing from each other, and the two roval mechanisms 18 and 19 that support them. However, the present invention is not limited to this. Three or more load cells, for example, a large weighing load cell, a medium weighing load cell, and a small weighing load cell are individually supported by a robust mechanism. Within the measuring range of the small scale, the value measured with a small scale load cell that can measure the load with a small scale is displayed on the indicator as the measured value of the weighing device. In this range, the value measured by the load cell of the medium scale that can measure the load with an intermediate scale is displayed on the indicator as the measurement value of the weighing device. It may be configured to display the indicator is switched to a value measured with a large weighing load cell larger scale interval as a measure of the metering device in the range of larger larger weighing than.

It is a top view of the to-be-inspected scale (track scale) in which the weighing apparatus which concerns on embodiment of this invention was arrange | positioned. (A) And (b) is the side view and the principal part side view of the to-be-inspected scale which respectively arrange | positioned the same weighing apparatus. It is a schematic front view of the to-be-inspected balance provided with the weighing apparatus. It is a side view of the weighing unit which comprises the same weighing apparatus. It is a partial cross-section front view of the weighing unit constituting the weighing apparatus. It is a front view of the load cell unit part of the same weighing unit. It is a side view of the load cell unit part of the same weighing unit. (A)-(c) is the top view of the base in the load cell unit of the same weighing unit, front sectional drawing, and a side view. (A)-(d) is a top view, front sectional view (sectional view taken along line IXb-IXb in FIG. 9 (a)), left side view, and right side view of the lower roval mechanism in the load cell unit of the same weighing unit. It is. (A)-(d) is a top view, front sectional view (cross-sectional view taken along the line Xb-Xb in FIG. 10A), left side view, and right side view of the load cell unit of the same weighing unit. It is. It is principal part plane sectional drawing of the rocking | fluctuation mechanism of the same weighing unit. It is a principal part side view of the rocking | fluctuation mechanism of the same weighing unit. It is a schematic block diagram of the same weighing apparatus. (A) And (b) is a figure for demonstrating a load loading state, the amount of bending, etc., respectively. (A) And (b) is the side view and principal part side view of the to-be-inspected scale which respectively arrange | positioned the weighing apparatus which concerns on other embodiment of this invention. (A) And (b) is the top view and side view of the to-be-inspected balance which respectively arrange | positioned the weighing apparatus which concerns on other embodiment of this invention. It is a front view of the to-be-inspected balance provided with the weighing apparatus according to the other embodiment. It is a front view of the to-be-inspected scale provided with the conventional weighing apparatus. It is a figure which shows the conventional load cell unit which piled up and arranged the some load cell for a different weighing capacity mutually in series in the up-down direction.

Explanation of symbols

1 Basic 3 Load cell (for weighing)
Reference Signs List 4 Stand 5 Scale to be inspected 10 Weighing device 11 Weighing unit 12 Supporting fixed frame 13 Hydraulic cylinder device (load generating device)
14 Load cell unit 15 Oscillating mechanism 16 Load cell for weighing (large scale)
17 Load cell for weighing (small scale)
17d Stopper portion 18, 19 Roverval mechanism 20 Base portion 22 Lower mounting body 23 Intermediate mounting body 24 Upper mounting body 25 Lower member for fixing 27 Intermediate member for fixing (spacer)
33, 36, 37, 39 Spherical seat 34, 38 Sphere

Claims (8)

In a posture aligned in the vertical direction between the support fixing frame fixed to the fixed portion in a posture straddling the upper side of the inspection table scale to be inspected, and the mounting base of the inspection table balance and the upper portion of the mounting table in the support fixing frame A load generator arranged in series and a load cell unit for weighing are provided,
In the load cell unit, a plurality of weighing load cells different in weighing from each other, and each weighing load cell are arranged corresponding to each weighing load cell, and each weighing load cell is stacked in series in the vertical direction, and the weighing load cell And a Roverval mechanism for supporting each load point where a load is applied in a state of overlapping in the vertical direction.   A small load in a plurality of weighing load cells abuts when a load that is larger than the weight of the load cell is applied, prevents a load larger than the weight from acting on the thin deformed portion of the small load cell and supports and fixes it 2. The weighing apparatus according to claim 1, further comprising a load transmitting portion serving as a stopper for transmitting a load from the frame side downward.   2. A swinging mechanism is provided between the support fixing frame and the load generating device or the load cell unit for weighing. The swinging mechanism swings so that a reaction force from the support fixing frame acts directly below. Or the weighing apparatus according to 2;   A plurality of sets of supporting and fixing frames, load generators and load cell units for weighing are provided, and the inclination angle of the stage at the time of instrumental inspection at the position supported by the weighing load cell provided on the platform to be inspected is plural. Each set of load generators and weights is placed at the same position on the platform when the load is applied by the load generator and when the weight is applied to the platform in an equally distributed state. The load cell unit according to any one of claims 1 to 3, wherein a load cell unit is provided.   The place where the load cell for weighing in the foundation provided on the ground is arranged is a foundation block portion having a ground strength greater than the force acting on the weighing load cell corresponding to the weighing, and the load cell for weighing in this foundation block portion The weighing apparatus according to any one of claims 1 to 4, wherein a support fixing frame is fixed in the vicinity of the arrangement location.   The place where the load cell for weighing on the foundation provided on the ground is arranged with a foundation block portion having a greater earth resistance than the force acting on the weighing load cell corresponding to the weighing, and the support leg portion of the support fixing frame for the foundation Is formed in a bifurcated shape so as to be on both sides centering on the placement point on the foundation of the weighing load cell provided on the platform to be inspected, and is fixed upright in the foundation block portion. The weighing apparatus according to any one of claims 1 to 4, characterized in that:   In a posture aligned in the vertical direction between the support fixing frame fixed to the fixed portion in a posture straddling the upper side of the inspection table scale to be inspected, and the mounting base of the inspection table balance and the upper portion of the mounting table in the support fixing frame A hydraulic cylinder device as a load generating device arranged in series and a load cell unit for weighing are arranged, and the load cell unit is arranged corresponding to each of the load cells for weighing and a plurality of load cells for weighing different from each other. And a robust mechanism that supports each weighing load cell in a posture in which the load cells are stacked in series in the vertical direction and each load point where a load acts on the weighing load cell overlaps in the vertical direction. This is an inspection method using a heavy equipment, in which a pre-loading is performed in advance with a support instrumentation frame, a hydraulic cylinder device, and a load cell unit for weight measurement before carrying out a regular instrumental error test. The amount of protrusion of the retractable rod of the hydraulic cylinder device or the amount of deflection of the mounting base and the support fixing frame from when the preload is applied to when the preload is applied is detected. Alternatively, based on the correlation between the amount of deflection and the measured weight value of the weighing device or the measured value of the weighing platform, whether or not the weighing device is properly installed is determined, and the supporting and fixing frame and the weighing platform. Weighing device characterized in that after performing a preliminary inspection to obtain a value corresponding to a spring coefficient of a structural body composed of a hydraulic cylinder device as a load generating device and a load cell unit for weighing, a regular instrumental error inspection is performed. Inspection method by.   In a posture aligned in the vertical direction between the support fixing frame fixed to the fixed portion in a posture straddling the upper side of the inspection table scale to be inspected, and the mounting base of the inspection table balance and the upper portion of the mounting table in the support fixing frame A load generator and a load cell unit for weighing are arranged in series. The load cell unit is arranged corresponding to each of the plurality of weighing load cells having different weighings, and each load cell for weighing. A method of assembling the weighing apparatus provided with a robust mechanism that supports the load cells in a state in which the load cells are stacked in series in the vertical direction and in which the load points where the load acts on the load cell for weighing overlap in the vertical direction In addition, a plurality of Roverval mechanisms are assembled in an up-and-down orientation using an assembly jig that is erected vertically with respect to the base of the load cell unit. After the assembly jig is removed, the load mounting body and the load cell for weighing are assembled and unitized in advance as a load cell unit, and the support fixing frame is fixed at the time of inspection, and the unit is formed between the support fixing frame on the mounting table. A method of assembling the weighing apparatus, comprising arranging the load cell unit and the load generating device to assemble the weighing apparatus.

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