CN2301709Y

CN2301709Y - Non-foundation-pit track bridge type weighing sensor

Info

Publication number: CN2301709Y
Application number: CN 97222649
Authority: CN
Inventors: 李金彪
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-09-05
Filing date: 1997-09-05
Publication date: 1998-12-23
Anticipated expiration: 2007-09-05

Abstract

The utility model relates to a non-foundation-pit track bridge type weighing sensor, composed of a beam 3 and supporting bodies 1 arranged on both ends of the beam and connected with the beam into integration. Transverse grooves are dug on the load bearing faces of both ends of the beam, transition blocks 2 are arranged in the grooves, and the side surface of the beam of the just lower part between two supporting points 6 of a filtering block is provided with symmetrical blind holes 5 in which strain foils are pasted. The utility model adopts the mechanical principle of the simply supporting beam so as to have the advantages of long sampling time, stable signal output, accurate measurement, simple structure and low processing cost; the upper part of a strain zone is provided with a transition device which can prevent the strain zone from being impacted and destroyed by loading wheels and can extend the service life of the sensor; when the utility model is used as a railroad track scale, the utility model can be conveniently installed and used without needing to dig foundation pits.

Description

No foundation ditch rail bridge-type LOAD CELLS

The utility model relates to a kind of resistance strain weighing transducer that is used for weighing system.

In the prior art, CN85203326U discloses a kind of by semi-girder, the supporter that is connected in Liang Yiduan and base constitutes and three parts fuse whole shear beam type sensor, this sensor has insensitivity, the temperature variation insensitivity of simple in structure, non-measurement load, good reproducibility, and precision is than advantages such as height, because this sensor stress point is single, when being applied on the track scale, girder table top, pressure bearing head and load-bearing rail must be installed, therefore cause foundation ditch darker, install, use all inconvenient.CN2087781U discloses a kind of full weighing section does not have foundation ditch rail type weighing and force-measuring transducer, its structure is that two above-mentioned shear beam type sensors oppositely are produced on together, and in two bearing end stack carrier bars formations, the electric signal that the two ends foil gauge produces output in parallel.This sensor carrier bar and two bearing ends constitute free beam, two stressed sums in bearing end are constantly equal to the wheel dead weight capacity when load-carrying wheel process carrier bar, thereby has a long advantage of sampling time, and need not dig foundation ditch, but, because strain regions is positioned on the cantilever of below, bearing end, it is quite high to make that this structure two ends symmetry requires, the machine work difficulty is big, error is arranged slightly, promptly cause two ends asymmetric, make that the each point signal is inconsistent on the total length weighing section, often at mid point section precision height, and the two ends precision is low; When particularly load-carrying wheel is pressed in sensor one end, the stressed sinking of this end, the other end is warpage upwards then, and foil gauge produces a negative signal, and the force side positive signal is offset a part, and therefore, total superposed signal can not reflect the wheel load-carrying fully, and measuring accuracy is low.

It is a kind of simple in structure, easy for installation that the purpose of this utility model is to provide, and need not dig foundation ditch, can directly substitute the LOAD CELLS that rail uses.

The utility model sensor is made of the supporter at beam and beam two ends, and beam and supporter are made by same block of resilient material and fused, and make beam become free beam, and foil gauge is pasted on the beam side faces at both ends, the electric signal that the two ends foil gauge produces output in parallel.On the loading end of square beam on the foil gauge, have transverse concave groove, the transition block that matches with it is arranged in groove.Use for convenience, this sensor can be made I-rail, and base plate is clipped in its stage casing, two ends are supporter, and it is beam that bottom parts is removed in the centre.

The utility model sensor compared with prior art, the advantage that has kept former shear beam type sensor, because the strain sample region is positioned at the free beam two ends, when the load-carrying wheel is on lintel, strain regions suffered scissors in two ends is linear change, both sums are constantly equal to the wheel dead weight capacity, thereby the sampling time is long, and simultaneously, the two ends symmetry is less demanding, it is inconsistent to have overcome on the full weighing section of prior art precision, particularly an end is stressed, and the make progress phenomenon of warpage of the other end is in weighing section, stable output signal, measuring accuracy improves; It is fast that the beam two ends are provided with transition, can avoid wheel to the impact failure that sensor produces, and can prolong the serviceable life of sensor; Adopt the I-rail structure, can directly substitute rail and use, and not have foundation ditch, install, use is all very convenient, and simple in structure, easy to process, can reduce production costs.

Fig. 1 is this practical new construction synoptic diagram.

Below in conjunction with accompanying drawing the utility model is described in detail:

Sensor shown in Fig. 1, be rolled into I-rail by same block of resilient material, and clip the base plate of its interlude, make that two ends are supporter 1, the interlude that removes base plate is a beam 3, dug transverse concave groove on the loading end of beam two ends and supporter connecting place, place the associated transition block 2 of shape in the groove, transition block is  shape along the axial cross section of beam, and there is projection 4 at two ends, and the stopper slot with projection 4 form fit is arranged on supporter 1 adjacent with the transition block two ends and the beam 3, stopper slot cooperates with projection can prevent that transition block from laterally moving, transition block and supporter, leave the gap between the beam,, influence the zero return of its sensor to guarantee that transition block is not stuck.The flat blind hole 5 of coaxial symmetrical circular has been dug in the web two sides of beam under between transition block two strong points 6, foil gauge sticks in the blind hole 5, and its method of attaching and electric connection mode are existing in prior art CN85203326U and CN2087781U clearly to be described.Because strain regions is between 2 liang of strong points 6 of transition block, the wheel dead weight capacity is not directly born in the strain regions top, thereby can prevent that the load-carrying wheel to the impact failure that the strain transducer district causes, can prolong the serviceable life of sensor.Have the through hole 7 that connects usefulness with rail on the web of two end supports body 1.During use, this sensor is placed on the roadbed, supporter is fixed on the roadbed, the former circuit in two ends connects with rail and can use, and installs, safeguards all very convenient.

Claims

1, a kind of no foundation ditch rail bridge-type LOAD CELLS, comprise by beam (3), supporter (1) and stick on the foil gauge of beam side surface, beam is an elastic body, it is characterized in that supporter (1) is positioned at the two ends of beam (3), and fuse with beam (3), make beam become free beam, foil gauge sticks on side, beam two ends.

2, sensor according to claim 1 is characterized in that having transverse concave groove on the loading end of beam (3) two ends foil gauge top, places the transition block (2) with the groove shapes coupling in the groove.

3, sensor according to claim 2 it is characterized in that transition block (2) is  shape along the beam axial cross section, and two strong points (6) lays respectively at the strain regions both sides.

4, sensor according to claim 3 is characterized in that above-mentioned groove both sides have stopper slot, and the projection (4) with the stopper slot coupling is arranged on the transition block (2).

5, according to claim 1,2,3 or 4 described sensors, it is characterized in that supporter (1) xsect is I-shaped, beam (3) xsect is T-shaped.

6, sensor according to claim 5 is characterized in that having through hole (7) on beam two end supports body (1) web.