CN2231412Y - Claw type elastic sensitive element load cell - Google Patents

Abstract

The utility model relates to a claw spring sensitive element force measuring sensor, which is characterized in that a spring sensitive element forms a claw-shaped structure which is always in compression state no matter pull or pressure is applied. The force measuring mechanism stress state of the structure changes the prior center compression state to eccentric compression state of the bending combination, the sensitivity of the sensor is increased, compressive strength and axial stiffness change little, and the utility model is especially suitable for the force measuring situation which gives attention to both stiffness and sensitivity.

Description

Claw type elastic sensitive element load cell

The utility model belongs to the technical field of design and manufacture of force-measuring sensors, in particular to a strain-type force-measuring sensor.

The structural forms of the elastic sensitive elements inside the existing strain gauge load cells can be roughly divided into two categories. One is the axially stressed elastic sensitive element characterized by a cylindrical or cylindrical type, which is characterized by stiffness Large, but low sensitivity; the other is the bending force type characterized by beam, plate or ring type, this type of elastic sensitive element is characterized by high sensitivity, but low stiffness. Since the above two types of elastic sensitive elements are limited by their structural forms, the stiffness and sensitivity cannot be balanced, so it is difficult to meet some use occasions that have strict requirements on stiffness and sensitivity, resulting in the use of this type of load cell. sex.

The purpose of the utility model is to provide a claw flap type elastic sensitive element force measuring sensor which can meet the requirements of stiffness and sensitivity at the same time.

The utility model is realized by the following technical solutions: turning the waist of the cylinder with a through hole at the bottom to form an annular groove, and after opening a cross or Pozider groove symmetrically in the axial direction from the cylinder mouth, the cylinder wall forms a non-uniform wall thickness. Radial arc-shaped claw structure, the strain gauge is pasted in the groove on the outer surface of the claw to form a full-bridge force measuring mechanism, the core rod with the ball surface passes through the through hole of the elastic sensitive element and the pressure washer, the pressure of the ball table surface The ring is fixed with a lock nut. The threaded end of the core rod is connected with the tension and pressure head. When the tension is applied, the ball table surface at one end of the core rod is stressed and acts on the bottom of the cylinder. When the threaded end of the core rod is under pressure on the surface of the ring, it acts on the end of the claw valve through the pressure washer, and the strain gauge in the groove on the surface is deformed under pressure. This structural form transforms the original state of compression at the center of the bottom of the cylinder into an eccentric pressure state of the combination of claw flaps under compression and bending, which increases the strain of the force-measuring mechanism and improves the sensitivity. , due to the deformation characteristics that the axial displacement is much smaller than the lateral displacement, the force measuring mechanism has a high axial compression stiffness.

Compared with the prior art, the utility model has the effect and advantage that it retains the characteristics of compact structure and high compressive stiffness of the cylindrical or column elastic sensitive elements, and at the same time has the elastic sensitive elements of plate type and beam type bending force The characteristic of high sensitivity is especially suitable for force measurement occasions that need to bear high pressure and high sensitivity.

Description of drawings of the utility model.

Figure 1 is a front sectional view of the utility model.

The figure is an A-A sectional view of the utility model.

The utility model will be further described below through the accompanying drawings. The pressure ring [6], the lock nut [7], the sheath end cover [10], etc. on the surface of the ball table are composed, and the elastic sensitive element [2] is a cylinder with a through hole at the bottom, which is turned into an annular groove. After the cross or Pozi groove is symmetrically opened in the axial direction from the cylinder mouth, the cylinder wall forms a radial arc claw structure with non-uniform wall thickness, and the strain gauges are pasted in the arc groove on the outer surface of the claw to form a full bridge measurement force mechanism. The core rod [1] with the ball table surface passes through the through hole at the bottom of the elastic sensitive element [2], the pressure washer [5], the ball table surface pressure ring [6], and is fixed with the lock nut [7] The sleeve end cover [10] and the nail [8] are packaged in the sheath [3], and the sensor installation hole [9] can be fixed with the booster head bracket, but there is a gap between the pressure ring [6] and the pressure washer [5]. 1 to 2 mm gap, the elastic sensitive element [2] and the pressure washer [5] are in a clearance fit with the inner wall of the sheath [3], the bottom end surface of the elastic sensitive element [2] is in contact with the bottom of the sheath [3] There is a gap of 1 to 2 millimeters, and the gap is pushed to death when the core rod [1] is under pressure. Therefore, regardless of the tension or pressure applied, the elastic sensitive element is always in a compressed state, but the strain measured by the strain gauge is two parameters of equal magnitude and opposite direction due to the different eccentric pressure bearing state of the force measuring mechanism.

Claims (2)

1. claw flap type elastic sensing element force cell, mainly by core bar, sheath, pressure-bearing packing ring, playing surface of the table pressure rings, elastic sensing element, compositions such as foil gauge, it is characterized in that elastic sensing element is the radial strut claw flap type structure of non-homogeneous wall thickness, foil gauge sticks on the interior full-bridge force measuring machine of forming of pawl lobe outside surface arc groove of elastic sensing element, the core bar thread end passes elastic sensing element bottom through-hole and pressure-bearing packing ring, playing surface of the table pressure rings, fixes with set nut.

2. claw flap type elastic sensing element force cell according to claim 1 is characterized in that elastic sensing element is eccentric bearing structure.

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