JPH0738933U - Load detector - Google Patents

Abstract

(57) [Abstract] [Purpose] While utilizing the characteristics of the compression type load cell in terms of the degree of freedom against lateral load and its resilience, it has a lateral load blocking function to protect the weighing machine and load cell, and is easy and inexpensive to assemble and adjust. To provide a simple load detection device. [Structure] A compression type load cell 1 having upper and lower spherical pressure receiving portions formed therein, and an upper base 4 and a lower base 5 are respectively fitted to a pressing metal 2 and a pressure metal 3 that are in contact with the spherical pressure receiving portion.
An upper cylindrical case 6 and a lower cylindrical case 7 are integrated with the upper base and the lower base, respectively, in a concentric circle with the pressing metal and the pressure receiving metal to form a pressure plate 8 and a pressure receiving plate 9, respectively. A drawer opening 11 is provided, and a plurality of concavo-convex portions 12 are provided on opposite end faces of both cylindrical cases.
And a plurality of upper and lower connecting fittings 14 that can be hung and removed are provided on the outer circumferences of both cylindrical cases.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention is an industrial weighing machine such as a hopper scale and a truck scale that uses a compression type load cell in which spherical pressure receiving parts are formed in the upper and lower parts, and a lateral load for protecting the weighing machine and the load cell when a large lateral load is applied. The present invention relates to a load detection device having a blocking function.

[0002]

[Prior art]

 Conventionally, when a large lateral load that adversely affects the weighing machine and the load cell is generated, the methods shown in Fig. 2 and Fig. 3 are used to protect the weighing machine and the load cell. 2 is applied to a hopper scale, (A) is a plan view and (B) is a front view. In this figure, three flanges 21 are fixed to the outer circumference of the hopper 20 in three equal parts, the upper surface of the load cell unit 22 is fixed to the lower surface of these flanges, and the lower surface of the load cell unit is fixed to the mount 26 of the hopper. It is fixed on the top surface. On the other hand, the check rod unit 23 is composed of the check rod 24 and the two brackets 25, and the brackets are fixed to the lower surface of the flange and the upper surface of the rack, respectively. It is constructed by adjusting the left and right clearances to b respectively, and when a large lateral load is applied to the hopper, lateral loads are prevented within the range of the clearance b on the left and right respectively.

Further, FIG. 3 is applied to a track scale, (A) is a plan view and (B) is a front view. In this figure, a pit is dug to form the truck scale platform 30 at the same height as the ground, and a foundation 34 is formed, and four load cell units 31 are installed between the platform and the foundation as shown in the figure. . In addition, stoppers 32 are installed on the platform side, and base metal plates 33 are installed on the foundation side in four positions in the traveling direction indicated by the arrow and four positions in the direction perpendicular to the traveling direction. Is adjusted so that it becomes b. Therefore, a large lateral load on the weighing machine and a lateral load in a direction perpendicular to the approach direction due to the entry and retreat of the truck are prevented within the range of the clearance b.

[0004]

[Problems to be solved by the device]

 However, in addition to the load cell mounting device, a check rod or stopper mounting device, a gantry or foundation work is required for the check rod system and the stopper system for countermeasures against these large lateral loads. Moreover, because of the large number of parts, it takes a lot of time during installation and adjustment.

As a method for solving the drawbacks of the check rod method or the stopper method, a load detecting device of Japanese Utility Model Laid-Open No. 5-57630 is disclosed. However, in this device, as shown in FIG. 4, it is necessary to install with a uniform predetermined gap between the inner periphery of the lower end of the cylindrical member 41 and the outer periphery of the lower pressure plate 44. It is covered up close to the plate 46, and the gap between the inner periphery of the lower end of the cylindrical member and the lower pressure plate is t2, but it is difficult to see, and the method shown in FIG. Although the gap t2 with respect to 2 is visible, the gap t1 between the cylindrical member and the lower mounting plate 46 is difficult to see.

Therefore, the present invention makes use of the characteristics of the compression type load cell in terms of the degree of freedom with respect to lateral load and the resilience, and even when a large lateral load that adversely affects the weighing machine and the load cell is generated, the weighing machine and the load cell are The purpose of the present invention is to provide a load detection device that has a lateral load blocking function for protection, eliminates the parts such as the check rod and stopper, and is easy to assemble and adjust and reassemble and adjust after inspection and repair, and is inexpensive in total. is there.

[0007]

[Means for Solving the Problems]

 According to the present invention, a compression type load cell having upper and lower spherical pressure receiving portions is formed, a presser ring is in contact with the upper part of the spherical pressure receiving part of the load cell, and a pressure plate is in contact with the lower part of the load cell. The upper base is fitted to the pressure receiving metal, and the lower base is fitted to each other, and the upper cylindrical case, which is concentric with the pressure metal, is integrally fixed to the upper base to form a pressure plate. The lower cylindrical case is integrally fixed to the lower base to form a pressure receiving plate, and an opening for pulling out the load cell cable is provided in one of the upper and lower cylindrical cases. A plurality of concave and convex parts are provided on the upper and lower sides, and the concave and convex parts are engaged with each other while keeping a constant gap in the vertical and horizontal directions, and further removed to align the pressure plate and the pressure receiving plate on the outer circumference of the upper and lower cylindrical cases. Possible on To constitute a load detection device connecting fitting multiple mounting.

[0008]

[Action]

 To assemble the load detecting device of the present invention, the upper spherical pressure receiving portion of the compression type load cell is fitted into the concave portion of the pressure plate of the pressure plate, and the concave portion of the pressure plate of the pressure receiving plate is fitted with the above-mentioned load cell. Fit the lower spherical pressure receiving part. At the same time, the vertical and horizontal gaps provided in the plurality of concavo-convex portions of the upper and lower cylindrical cases are adjusted to have predetermined dimensions. When fitting the above-mentioned load cell to the pressure plate and pressure receiving plate, pull out the load cell cable from the opening provided in either the upper or lower cylindrical case according to the load cell. In addition, the pressure plate and the pressure receiving plate are fixed by a plurality of upper and lower connecting fittings provided on the outer circumference of the upper and lower cylindrical cases to form an integrated load detecting device.

When actually mounting on a hopper scale as shown in FIG. 2, for example, after mounting the upper base on the flange and the lower base on the frame, loosen the upper mounting bolts of the plurality of upper and lower connecting fittings. By removing the notch in the connecting plate, the pressurizing plate and the pressure receiving plate can maintain the lateral degree of freedom within the range of the lateral gap between the concave and convex portions, and it is possible to shake the hopper scale appropriately, which affects the weighing accuracy. Does not affect It also acts as a stopper in the lateral direction of the uneven part for large lateral loads. Furthermore, for inspection and repair, if the upper and lower connecting fittings are fixed to the upper and lower cylindrical cases, the load detecting device can be easily removed from the weight as a unit.

[0010]

【Example】

 An embodiment of the present invention is shown in FIG. 1A is a front view, FIG. 1B is a cross-sectional view taken along the line X-X ′ of FIG. 1A, and FIG. 1C is a side view showing only the upper and lower connecting fittings. In these figures, reference numeral 1 denotes a strain gauge type compression type load cell in which spherical pressure receiving portions are formed at upper and lower ends, respectively, and which has a substantially cylindrical shape and is provided with a cable 10 for outputting a weight signal. Reference numeral 2 designates a pressure metal fitting in which a concave portion is fitted and brought into contact with the upper spherical pressure receiving portion of the load cell, and is fitted almost in the center of the upper base 4 which receives a load directly from the hopper flange or the track scale mounting base. Reference numeral 6 denotes an upper cylindrical case that is secured to the upper base by welding or the like so as to have a sufficient space larger than the outer diameter of the load cell 1 and is concentric with the above-mentioned pressure contact metal. The eight pressure plates are composed of.

Similarly, 3 is a pressure receiving metal having a concave portion fitted and abutting on the lower spherical pressure receiving portion of the load cell, which is fitted almost in the center of the lower base 5 attached to the base of the hopper or the track scale, and 7 is the pressure receiving metal. A lower cylindrical case having the same diameter as the cylindrical case 6 and concentric with the metal fitting is fixed to the lower base 5 by welding or the like to form a pressure receiving plate 9 together with the pressure receiving metal and the lower base. There is. The cylindrical case 7 has an appropriate opening 11 for taking out the cable 10 of the load cell. This opening may be provided in the upper cylindrical case 6 in connection with the load cell.

Four concavo-convex portions 12 are provided on the end faces of the upper cylindrical case 6 and the lower cylindrical case 7 facing each other so that the longitudinal and lateral gaps 13 are a and b, respectively. After being processed, the concave portion and the convex portion are attached so as to be engaged with each other while maintaining the above-mentioned gap. The lateral gap b is set within the permissible lateral vibration range of the hopper or mounting table. Therefore, when a large lateral load is applied, the twelve concavo-convex portions function as stoppers and protect the weighing machine and load cell. Although the uneven portion is set to four places in the embodiment, it may be three places or five places or more.

Reference numeral 14 is an upper and lower connecting fittings provided in order to correct the positional relationship between the pressure plate 8 and the pressure receiving plate 9 at the time of construction. The connecting plate has a notch 16 on one side and a bolt hole 17 on one side. 15 and upper and lower mounting bolts 18 and 19. The upper cylindrical case 6 and the lower cylindrical case 7 are provided with four screw holes at positions facing each other vertically, and the upper and lower connecting fittings of 14 are attached. Therefore, in this state, the load detection device according to the present invention can be carried together without breaking the vertical positional relationship. Actually, when mounting on a hopper scale or a truck scale, after installing the upper base of 4 and the lower base of 5 at the designated places respectively, loosen the upper and lower bolts 18 and 19 and remove the notch 16 from the bolt 18, Bring the connecting plate of 15 to the position shown by the chain line and tighten the upper and lower bolts 18 and 19. As a result, the lateral freedom between the pressure plate and the pressure receiving plate is maintained, and the vertical load is also transmitted to the load cell. In the above description, the upper and lower connecting fittings are provided at four locations on the outer circumference of the upper and lower cylindrical cases, but they may be provided at two locations in the right angle direction or at locations corresponding to equal fractions on the circumference.

[0014]

[Effect of device]

 The load detection device of the present invention makes use of the characteristics of the compression type load cell in terms of the degree of freedom with respect to lateral load and resilience, and even when a large lateral load that adversely affects the weighing machine and the load cell occurs, parts such as check rods and stoppers are provided. It is possible to protect the weigher and load cell with a function to prevent lateral loads without requiring a load, and it is extremely easy to make assembly adjustments during installation and reassembly adjustments during inspections and repairs. The effect is that heavy machinery can be provided.

[Brief description of drawings]

FIG. 1 is a front view of a load detection device according to an embodiment of the present invention, and FIG. 1A is a sectional view taken along the line XX ′ of FIG. It is the figure (C) showing.

FIG. 2 is a plan view (A) and a front view (B) in which a conventional load detection device is applied to a hopper scale.

FIG. 3 is a plan view (A) and a front view (B) in which a conventional load detection device is applied to a track scale.

FIG. 4 is a cross-sectional view of an example of a conventional load detection device disclosed in Japanese Utility Model Laid-Open No. 5-57630.

FIG. 5 is a cross-sectional view of essential parts of another embodiment of the conventional load detecting device disclosed in Japanese Utility Model Laid-Open No. 5-57630.

[Explanation of symbols]

 1 Compression type load cell 2 Pressurizing metal plate 3 Pressure receiving metal plate 4 Upper base 5 Lower base 6 Upper cylindrical case 7 Lower cylindrical case 8 Pressure plate 9 Pressure plate 10 Load cell cable 11 Opening part 12 Uneven part of upper and lower cylindrical case 13 Uneven part Gap 14 Upper and lower connecting fittings 15 Connecting plate 16 Notch 17 Bolt hole 18 Upper bolt 19 Lower bolt

Claims (1)

[Scope of utility model registration request] 1. A compression type load cell having a spherical pressure receiving portion formed on the upper and lower portions thereof, and an upper base and a lower base fitted to pressurizing and pressure receiving abutments respectively abutting on the upper and lower spherical pressure receiving portions of the load cell. An upper cylindrical case and a lower cylindrical case, which are concentric with the pressure and pressure receiving metal, are integrally fixed to the upper base and the lower base, respectively, to form a pressure plate and a pressure receiving plate, and a load cell is mounted on the lower cylindrical case or the upper cylindrical case. An opening for pulling out the cable of
A plurality of concave and convex portions are formed on the end surfaces of the upper cylindrical case and the lower cylindrical case which face each other, and the concave and convex portions are meshed with each other while maintaining a constant gap in the vertical and horizontal directions, respectively.
Further, a load detecting device comprising a plurality of upper and lower connectable metal fittings which are detachably attached to the outer circumference of the upper cylindrical case and the lower cylindrical case.