JP4436653B2 - Weigher - Google Patents

Description

The present invention is a compression type load cell mainly used for a large-scale industrial weighing machine such as a truck scale. When the load cell receives a large lateral load or a lift load, the load cell having a function of blocking those loads is provided. It relates to weighers.

Conventionally, the method shown in FIG. 5 is implemented as a method for protecting the weigher and the load cell when a large lateral load that adversely affects the load cell used in the weigher is generated. 5A and 5B are applied to a track scale. FIG. 5A is a plan view and FIG. 5B is a side view. In this figure, a pit is dug to form the platform 30 of the track scale at the same height as the ground, and a foundation 34 is formed. As shown in the figure, four load cell units 31 are installed between the platform and the foundation. . In addition, there are at least eight stoppers 32 on the platform side and four foundation pads 33 on the foundation side in the advancing direction indicated by the arrows and four in the direction perpendicular to the advancing direction. And adjusted so that the gap between and becomes b. Accordingly, a large lateral load applied to the weighing machine due to the approaching and retreating of the truck and a lateral load perpendicular to the approaching direction are prevented within the gap b.

However, in the case of a large scale such as the truck scale shown in FIGS. 5 (A) and 5 (B), it is necessary to perform the foundation work for mounting the stopper foundation in addition to the load cell mounting position. It takes a lot of time. In addition, the cost is high due to the large number of parts. As a method for solving the drawbacks of such a system, a load detection device disclosed in Patent Document 1 is disclosed. However, even with this apparatus, since it is difficult to confirm the gap, there is a problem that it takes time to install the apparatus while maintaining a predetermined gap. Moreover, since it is performed visually, it is difficult to confirm the slight inclination of the load cell, and there is a disadvantage that it is difficult to obtain an accurate load cell perpendicularity.

Japanese Utility Model Publication No. 5-57630

Further, as a method for solving the above-described drawbacks, there is Patent Document 2 as an introduced document. Here, a method is disclosed in which when the load cell unit is assembled and installed, the gap is made uniform by visually observing the positional relationship between the hole portion of the load cradle and the regulating shaft for regulating the lateral runout. It is difficult to visually check whether or not a predetermined gap has been secured.

JP 2002-202183 A

As described above, the countermeasures for lateral loads of large scales that have been implemented so far are costly and require a lot of time for installation, and thus workability is poor. For example, in the case of a large scale such as a truck scale, load cell units are usually used at four locations. However, in the conventional structure, even if the unit can be adjusted in the verticality and gaps of a single load cell, There is always a problem that it is difficult to secure the mounting accuracy between the units due to a slight dimensional error in the foundation work, and it takes a long time to obtain a predetermined mounting accuracy. In particular, it is difficult to check the verticality of the load cell. Further, even when the initial state of the related dimensions is changed and readjustment is performed, there is a big problem that accurate adjustment cannot be performed in practice.

The present invention is intended to solve such problems of the prior art, and a weighing machine using a load cell unit that can easily adjust the gap described above even if a beginner can automatically establish the verticality of the load cell. It is to provide.

The weighing machine according to the present invention uses a load cell case that accommodates this load cell using a compression type load cell in which spherical pressure receiving portions are formed on upper and lower parts, a so-called double convex type, and a lower base of the case. In addition, the pressure plate and the pressure plate are fitted and fixed to the upper plate, and a compression type load cell is mounted between the pressure plate and the pressure plate. The pressure receiving pressure and pressure pressing money are located on a vertical line, and the above-mentioned case upper plate has a hole larger in diameter than the diameter of the pressure pressing body on the concentric circle of the pressure receiving pressure and pressure pressing money. A load cell unit having a structure in which a gap adjusting jig is detachably fitted in a gap between a body portion of the pressurizing metal and a hole provided in the upper plate, and the load cell unit is placed at a predetermined position of the weigher. After the installation, the gap adjustment jig is positioned so that it can be easily removed, and the load cell unit is accurately installed at a predetermined position by removing the gap adjustment jig. It is characterized by comprising a load cell unit that is secured at the same time. (Claim 1).

In a large scale weigher, each load cell unit can be mounted with ease by using such a work procedure, so that the gap S2 between the load cell units can be made uniform. Accordingly, since the verticality of the load cell is naturally ensured by making S2 uniform, the error in the detected load due to the change in the amount of bending of the loading table during no load and when loaded is extremely small, and the gap is uniform at the same time. For this reason, the degree of shaking with respect to rolling is constant, and the function as a steady rest device with good resilience against shaking is exhibited.

Since the present invention is a weighing machine having a function as a steady rest device, for example, when weighing a vehicle such as a truck (lorry vehicle), the truck brakes on the platform of the weighing machine. In such a case, the time required for weight measurement can be shortened because the platform sways quickly and converges. Further, even when the weigher is installed by a plurality of workers, there is no operator's sensory error with respect to the installation dimensional accuracy, and the gap S2 of the load cell unit becomes uniform. Can be made a weigher with excellent durability and dispersed without being concentrated in one place.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a structural diagram of a weigher using the load cell unit of the present invention. FIG. 2 is a plan view taken along line AA in FIG. 1 is a load cell unit, 2 is a strain gauge type compression load cell in which spherical pressure receiving portions are formed at upper and lower ends, and is substantially cylindrical, and 3 is a pressurizing contact abutting against the upper spherical pressure receiving portion of the load cell 2, 4 is inserted into the center of the upper base 5 that receives the load directly from the main girder 21 of the weighing machine platform 20 through the mounting seat 19, and 4 is a pressure receiving abutting contact with the lower spherical pressure receiving portion of the load cell 2. 5 is an upper base, 6 is a lower base, 7 is an upper plate, and 8 is a case side plate. The lower base 6 is attached to the base base plate 23 installed on the foundation 22 of the heavy machine. The lower base 6 and the upper plate 7 form a space vertically spaced by the case side plate 8, and the load cell 2 is vertically installed and accommodated in this space. Further, the shaft center of the pressure receiving drum body 3 a fitted into the upper base 5, the center of the hole 10 provided in the upper plate 7, and the shaft of the pressure receiving drum body 4 a fitted into the lower base 6. The center is located on the same axis. 9 can be divided into two or more by a gap adjusting jig. 3A and 3B show the gap adjusting jig 9 according to the present invention, in which FIG. 3A is a plan view showing two parts, and FIG. 3B is a sectional view thereof. As shown in (B), the cross section is L-shaped and has a structure in which a step of t1 is provided in the thickness direction and a flange of S1 is provided. The flange S1 is fitted into a circumferential gap S2 generated by the difference between the hole 10 provided in the center of the upper plate 7 and the diameter of the body 3a of the pressurizing metal 3 and can be easily attached and detached. It has become.

Next, assembly of the load cell unit of the present invention will be described. As shown in FIG. 1, the load cell 2 is inserted from the notch 12 (FIG. 2) of the case side plate 8 of the load cell unit 1, and the load cell is inserted into the recess 4 b of the pressure receiving metal 4 inserted in the center of the lower base 6. In this state, the load cell 2 will fall, but by tilting the gap between the lower end portion 2a of the load cell 2 and the upper end portion 4c of the recessed portion of the pressure receiving metal 4, some inclination during assembly is allowed. The gap adjusting jig 9 divided in this state is inserted into a hole provided in the central portion of the upper plate 7, and the body 3a of the pressurizing metal 3 fitted in the upper base is divided. Insertion is made so as to penetrate through the hole formed by the tool 9, and at this time, the load cell 2 is inserted while adjusting the inclination of the load cell 2 so that the upper pressure receiving portion of the load cell is in contact with the recess 3 b of the pressurizing metal 3. If the upper and lower pressure receiving portions of the load cell 2 are in contact with the concave portion 3b of the pressure receiving metal 3 and the concave portion 4b of the pressure receiving metal 4, respectively, the load cell 2 is aligned with the axis of the case 8 so that the verticality is secured. It has become.

  Next, a description will be given of a lift prevention device when the upper base of the load cell unit receives a lift load. This lifting prevention device is performed by using a bolt 13 for preventing lifting between the upper plate 7 and the upper base 5 of the case 1. As shown in FIG. 1, 14 holes are provided at predetermined positions on the upper plate 7 as shown in FIG. 1, and the bolts further pass through the holes and are provided with bolt mounting holes 15 for preventing lifting that are provided at predetermined positions on the upper base 5. The nut 16 penetrates and is fixed. A predetermined gap S4 is secured between the lower neck portion of the bolt 13 and the lower surface of the upper plate 7. Further, the diameter of 14 holes provided at a predetermined position of the upper plate 7 is larger than the diameter of the bolt, and the gap is S3. The gap S3 may be the same as or larger than S2.

  An example in which the load cell unit having such a structure is applied to an actual weighing machine will be described. 1 and FIG. 5, the case of newly installing will be described. As shown in FIG. 1, foundations 22 dug from the ground (not shown) are constructed, and load cell units are provided at four corners of the foundation 22. A base base plate 23 is installed at a predetermined interval. First, the load cell unit used in the present invention is placed at a predetermined position on the base base plate 23, and a mounting hole (not shown) of the base base plate 23 and a mounting hole (not shown) of the lower base 6 of the load cell unit are formed. At the same time, the mounting bolts 17 are temporarily fixed. Next, a platform on which an object to be weighed composed of the mounting seat 19, the main girder 21, the mounting platform 20 and the like is placed is placed on the upper base 5 of the load cell unit installed at the four corners, and the mounting holes ( The mounting holes (not shown) and the mounting holes (not shown) of the upper base 5 are aligned and temporarily fixed with the mounting bolts 18. In this process, each mounting bolt may not easily enter a predetermined hole. Therefore, the mounting bolt that has been temporarily fixed is loosened, the load cell unit is moved slightly in the horizontal direction, and then bolted again. If the installation position is accurately ensured at this stage, it becomes easy to attach and detach the gap adjusting jig described later.

Further, when the load cell unit is applied to the conventional track scale for replacement, the load cell unit 31 is installed in a portion where the conventional load cell 31 is installed. In this case, four load cells 31 are removed one by one and replaced with the load cell unit of the present invention, and 32 check rods are also removed at the same time. The basic allowance 33 becomes unnecessary. In this way, all the load cell units of the present invention are replaced after the load cell 31. The relational position between the load cell units may be slightly different depending on the overall work accuracy (dimensional error) including the main girder 21 constituting the platform 20. In particular, when installing on a concrete foundation, a foundation base plate 23 subjected to predetermined machining is laid when the foundation is laid. However, since the positional relationship between the platform and the foundation may be different, the mounting bolt 17 Loosen and 18 and adjust to fix the position.

  In the present invention, the track scale is taken as an example, and the conventional problems are solved by the structure described above. That is, after the load cell unit is installed at a predetermined position, whether or not the gap adjusting jig 9 is installed in a state where it can be easily removed by hand is checked only by the hand force, not visually. Yes. Therefore, in the above example, first, it is confirmed whether or not the gap adjusting jig of any one load cell unit can be easily attached / detached. , 18 is loosened, and either the mounting side or the base side is moved little by little in the horizontal direction to adjust the mounting relationship with the load cell unit, so that the gap adjusting jig can be easily attached or detached. Confirm. If it can be easily attached / detached, the gap adjustment jig is not removed at this stage, and the same operation is performed by moving to the next load cell unit, but the positional relationship of the load cell unit adjusted first is slightly changed and easily changed. It may become impossible to detach. In such a case, the same operation is repeated again. When the gap adjusting jigs of all the load cell units can be easily attached and detached, all the gap adjusting jigs are removed for the first time. Of course, since the gap adjusting jig needs to be easily taken out of the load cell unit, t2 between the upper surface of the gap adjusting jig and the lower surface of the upper base 5 is larger than the step size of t1 in the thickness direction. Therefore, it is desirable to secure a relationship of t1 <t2 by providing a space.

In addition, when a load cell failure is discovered during periodic inspections, the defective load cell is replaced. Even in such a case, after replacing the load cell, the gap adjusting jig removed at the time of installation is prepared again, and the hole provided in the central portion of the upper plate 7 and the body of the pressurizing metal 3 are the same as at the time of installation. A gap adjusting jig is inserted into the gap 3a, and readjustment is performed with the mounting bolts 17 and 18 so that the gap is evenly formed while considering the relationship with other load cell units. When the gaps in the load cell units become uniform, the process is completed by removing all the gap adjusting jigs from the load cell unit. As described above, the gap adjusting jig of the present invention can be used during maintenance inspection.

It is a structural diagram of a weighing machine using the load cell unit of the present invention. FIG. 2 is a plan view of the present invention FIG. (A) of the gap adjusting jig of the present invention is a plan view (B) is a sectional view. It is a perspective view of the gap adjusting jig of the present invention. (A) which applied the conventional load detection apparatus to the track scale is a top view, (B) is a side view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Load cell unit 2 Load cell 3 Pressurizing metal 4 Pressure receiving metal 5 Upper base 6 Lower base 7 Upper plate 8 Case side plate 9 Gap adjustment jig 13 Lifting prevention bolt 19 Mounting seat 20 Mount 21 Main girder 22 Foundation 23 Foundation base Board

Claims (4)

A compression type load cell having spherical pressure receiving portions formed on the upper and lower portions, a lower base to which a pressure receiving metal is fitted and fixed, and a body of the pressure pressing body in which the pressure receiving metal and the pressure metal are concentric. A load cell housing case composed of an upper plate provided with a hole having a diameter larger than the diameter, a case side plate supporting the upper plate , an upper base to which the pressurizing metal is fitted and fixed, and the pressurizing metal A weigher comprising a load cell unit provided with a gap adjusting jig removably fitted in the gap in order to make the gap between the diameter of the body portion and the hole uniform. The gap adjusting jig is divided into at least two parts (divided into two), and when the gap adjusting jig is removed, each gap adjusting jig can be removed for each division. The weigher according to claim 1. The gap adjusting jig is divided into two equal parts and / or fan-shaped gap adjusting jigs, and when the gap adjusting jig is removed, the gap adjusting jig can be removed for each division. The weigher according to claim 1, comprising a load cell unit including an adjustment jig. A stopper bolt for preventing the upper base and the upper plate of the load cell housing case from easily separating and / or separating between the upper base and the upper plate of the load cell housing case is provided with a predetermined gap. The weigher according to claim 1, comprising a load cell unit provided at least at one location.

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