CN202304987U

CN202304987U - Pressing head for weighing apparatus

Info

Publication number: CN202304987U
Application number: CN2011203862581U
Authority: CN
Inventors: 张文波
Original assignee: NINGBO BENYUAN ELECTRONICS CO Ltd
Current assignee: NINGBO BENYUAN ELECTRONICS CO Ltd
Priority date: 2011-10-12
Filing date: 2011-10-12
Publication date: 2012-07-04
Anticipated expiration: 2021-10-12

Abstract

The utility model relates to a pressing head for a weighing apparatus. The pressing head for the weighing apparatus comprises a body, wherein a socket-shaped groove which sinks inwards is formed on the body. The pressing head for the weighing apparatus is characterized in that the socket-shaped groove is elliptic. Compared with the prior art, the pressing head for the weighing apparatus has the advantages that after adoption of an elliptic socket-shaped pressing head, an azimuth error of a sensor can be effectively avoided, so that the azimuth error of an electronic weighing apparatus due to length change caused by temperature change is effectively avoided, and the accuracy and the stability of the electronic weighing apparatus are improved.

Description

A kind of weighing apparatus is used pressure head

Technical field

The utility model relates to a kind of weighing apparatus and uses pressure head.

Background technology

The pressure head that existing weighing apparatus generally uses at present is isometrical ball-and-socket shape, and referring to shown in Figure 1, its effect is single, and activity is poor.With QS bridge type magnetic sensor the most frequently used in the electronic vehicle weighing apparatus is example, and its structure and application are referring to shown in Figure 2, and it comprises pressure head 1 ', steel ball 2 ', attaches cover 3 ', elastic body 4 ', cable 5 ', base 6 '; Mechanical model after the simplification is as shown in Figure 3; Masterpiece is used for pressure head, and cambered surface and steel ball through pressure head act on elastomeric cambered surface again, in theory; Three above-mentioned parts ability automatic alignings, but in actual manual operations, can't reach.Be installed on the sensor more than at least 3 even 10 in the general electronic scale; Has only a sensor ability automatic aligning (lowest part of cambered surface) in theory; If three above-mentioned parts are not on same straight line; Particularly steel ball is not or not the center of elastic body cambered surface, with the precision that obviously influences sensor. and the alignment error like two sensors among Fig. 4 is L.Though can be through on-the-spot adjustment/debugging; Method through machinery and electronics; Weighing apparatus is adjusted in the C3 level national standard; But the scale body temperature with or the power effect length variations (that is to say sensor steel ball position and will change by force direction) of expanding with heat and contract with cold and causing down with flexural deformation, with the precision that influences weighing apparatus.

The utility model content

The utility model technical matters to be solved is to provide a kind of accuracy of weighing apparatus and weighing apparatus of stability of providing to use pressure head to above-mentioned prior art.

The utility model solves the problems of the technologies described above the technical scheme that is adopted: this weighing apparatus is used pressure head, comprises body, and body is provided with inwardly recessed nest shape groove, and it is characterized in that: said nest shape groove is elliposoidal.

As improvement, the horizontal radius of the radian of said elliposoidal nest shape groove is 2～3 times of vertical radius of the radian, is good with 2.5 times.

Improve, said body exterior integral body is cylindrical shape again, and the location when it helps installing can retrain its displacement radially simultaneously.

Improve, said body is provided with two screws again, and the location when it helps installing (major diameter that the location the is oval and direction of minor axis) can be passed through the screw assembling and positioning with the scale body simultaneously.

Compared with prior art; The advantage of the utility model is: the pressure head that adopts oval ball-and-socket shape; Can solve the azimuthal error of sensor effectively, cause that length changes and the azimuthal error that causes in temperature variation, improve the accuracy and the stability of electronic scale thereby solve electronic scale.

Description of drawings

Fig. 1 is the structural representation of existing weighing apparatus with pressure head;

Fig. 2 is the application structure synoptic diagram of existing QS bridge type magnetic sensor;

Fig. 3 is the force diagram of existing QS bridge type magnetic sensor;

Fig. 4 is equipped with the alignment error of two sensors for existing QS bridge type magnetic sensor;

Fig. 5 be among the utility model embodiment weighing apparatus with the perspective view of pressure head;

Fig. 6 be among the utility model embodiment weighing apparatus with the vertical view of pressure head;

Fig. 7 be among Fig. 6 A-A to cut-open view;

Fig. 8 be among Fig. 6 B-B to cut-open view.

Embodiment

Embodiment describes in further detail the utility model below in conjunction with accompanying drawing.

Weighing apparatus shown in Fig. 5～8 is used pressure head, comprises body 1, and body 1 external overall is cylindrical shape, and body 1 is provided with inwardly recessed nest shape groove 2, and this nest shape groove is elliposoidal.In the present embodiment, the horizontal radius of the radian of elliposoidal nest shape groove is 200mm, and vertically radius of the radian is 85mm; Body is provided with two screws 3, and the location when it helps installing (major diameter that the location the is oval and direction of minor axis) can be passed through the screw assembling and positioning with the scale body simultaneously.

Adopt the pressure head of said structure shape,, or absorb most displacement, act on elastomeric cambered surface central point to guarantee steel ball, thereby guaranteed the precision of weighing apparatus in pressure head because the cambered surface of scale body length direction big (approaching the plane).

Because do not adopt the plane in the design but stable based on the mechanical structure of scale body than the cambered surface of long radius, if the plane, the scale body is abandoned so; But automatic movable, this is unfavorable for the assurance of precision and the safety of weighing apparatus equally. likewise adopt oval ball-and-socket shape, be based on the constraint of consideration at the Width (3M place) of scale body; (power effect distortion can be ignored basically, and temperature effect has only 3/7,3/14 but because deflection is less; 3/21), so adopt oval minor axis constraint. to sum up, novel pressure head has strengthened the activity of length direction; Retrain the activity of Width simultaneously, thereby guaranteed the weighing apparatus precision under the different operating modes.

Claims

1. a weighing apparatus is used pressure head, comprises body, and body is provided with inwardly recessed nest shape groove, and it is characterized in that: said nest shape groove is elliposoidal.

2. weighing apparatus according to claim 1 is used pressure head, it is characterized in that: the horizontal radius of the radian of said elliposoidal nest shape groove is 2～3 times of vertical radius of the radian.

3. weighing apparatus according to claim 1 is used pressure head, it is characterized in that: the horizontal radius of the radian of said elliposoidal nest shape groove is 2.5 times of vertical radius of the radian.

4. use pressure head according to any described weighing apparatus of claim in the claim 1～3, it is characterized in that: said body exterior integral body is cylindrical shape.

5. use pressure head according to any described weighing apparatus of claim in the claim 1～3, it is characterized in that: said body is provided with two screws.