CN86206085U - Small volume senser with air-pressure automatic compensation - Google Patents

Abstract

The utility model discloses a strain beam type sensor with a small volume. The small volume sensor with air-pressure automatic compensation adopts an upper and a lower layers of membrane sheets and is provided with an adjustable overload protective device, and the adjustable overload protective device and a bearing section are on the same axial line. Therefore, the small volume sensor with air-pressure automatic compensation has the functions of air-pressure automatic compensation and overload prevention, and the small volume sensor with air-pressure automatic compensation has simple and reasonable structure, so the small volume sensor with air-pressure automatic compensation is suitable for a measuring and weighing system with a small volume.

Description

Small volume senser with air-pressure automatic compensation

The utility model relates to a kind of dynamometry and strain beam type low capacity sensor of weighing of being used for.

Strain beam type low capacity sensor in industrial production often changes owing to sensor inner chamber air pressure varies with temperature at present, cause the output at zero point of sensor to change, thereby influenced the measuring accuracy that passes measuring device greatly, also influenced the long-time stability of sensor.In addition, strain beam type low capacity sensor in use owing to the impact of load, vibrates, and in debugging, easily transships and strain beam generation plastic yield in the maintenance, causes the damage of sensor.

Owing to above-mentioned two reasons, the low capacity sensor has been subjected to bigger restriction in application.

The purpose of this utility model is to provide a kind of low capacity sensor with air pressure self compensation ability and overload protection ability, to solve the existing problem of the sensor.

Fig. 1 is an air pressure self compensation sensor.

Fig. 2 is the sectional view along Figure 1A-A.

Fig. 3 is parallel beam sensor.

Fig. 4 is the cross beam sensor.

Sensor of the present utility model as shown in Figure 1; its ingredient is shell (6); pressure bearing head (3); load transfer device (5), overload protection screw (4), strain beam (1) and be pasted on foil gauge (2) on the strain beam; overload regulator (9); on, lower seal diaphragm (10), (8).

In above-mentioned ingredient, pressure bearing head (3), overload protection screw (4) can be fixed together with load transfer device (5) by being threaded, and the axis of pressure bearing head and overload protection screw is on same straight line.Strain beam (1) one end and load transfer device (5) connect together, and the other end links to each other with shell (6).Foil gauge (2) connects into Wheatstone bridge usually and realizes electrical measurement.The overload regulator can be fixed on the shell (6) by dog screw (12).And on, lower seal diaphragm (10), (8) then can be embedded in respectively in pressure bearing head (3) and the overload protection screw (4), and the outer rim of seal membrane then adopts the form of pressure ring (7) or welding to be fixed on the shell (6).On, following diaphragm (10), what adopted (8) is commaterial, arm such as rubber or metal, and area, thickness are all identical.Convenient for the reality use, generally on shell (6) base, open 4 holes (14).

Owing to adopted same material to make; area; the upper and lower seal membrane (10) that thickness is also identical; (8); and the axis of pressure bearing head (3) and overload protection screw (4) is on same straight line; therefore vary with temperature and when changing when the air pressure of inner chamber (15); pressure bearing head (3); load transfer device (5) and overload protection screw (4) are made the as a whole a pair of equal and opposite in direction that is subjected to; direction is opposite; and acting on collinear power, it can not make strain beam (1) deform, thereby has overcome the shortcoming that zero point, output changed.

When rated load; as long as regulate the gap between overload regulator (9) and the overload protection screw (4); can when overload takes place; overload regulator (9) contacts with overload protection screw (4); make pressure bearing head (3) no longer produce displacement; thereby strain beam no longer produces distortion, plays overload protective function.

Sensor forms the lower end of the overload protection screw (4) of part and often does globulate, the stability when it has improved overload protective function.

Strain beam (1) can be made various ways, and the simplest is single semi-girder (17), foil gauge (2) be attached to beam two ends on, on the lower surface.

Saying best from measuring accuracy is parallel girder (18), be beam is scraped out hole, two gardens with single semi-girder difference, and foil gauge (2) is attached to the thinnest part of beam.

Rood beam (19) is another form, and at this moment pressure is the intersection central point that acts on rood beam (19) by pressure bearing head (3), and four external parts of rood beam then link to each other with shell (6) is inboard in the mode of freely-supported respectively.Foil gauge (2) respectively pastes a slice around cross part, four external parts respectively paste a slice.

Claims (3)

1, a kind of low capacity sensor; by shell (6); pressure bearing head (3); load transfer device (5); overload protection screw (4) and strain beam (1) and the foil gauge (2) that is pasted on the strain beam constitute; it is characterized in that containing the upper-lower seal diaphragm (10) that overload regulator (9) is identical with the area of being made by same material, thickness is identical, (8).

2, by the said sensor of claim 1, the lower end that it is characterized in that said overload protection screw (4) is a ball shape.

3, by claim 1 or the said sensor of claim 2, it is characterized in that said strain beam (1) is parallel girder (18) or rood beam (19).

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