CN2220638Y

CN2220638Y - Device for dynamically calibrating force sensor

Info

Publication number: CN2220638Y
Application number: CN 94246366
Authority: CN
Inventors: 张于北
Original assignee: No304 Inst Chinese Aviation Industry General Co
Current assignee: No304 Inst Chinese Aviation Industry General Co
Priority date: 1994-12-28
Filing date: 1994-12-28
Publication date: 1996-02-21
Anticipated expiration: 2004-12-28

Abstract

The utility model belongs to sensor test field relates to the improvement to force sensor developments calibration device. The utility model discloses a frame, fix the pneumatic cylinder 3 in frame one end, by the pressure head 6 that the pneumatic cylinder promoted, fixed at the other end of frame by the force transducer 11 of maring, have one to lay the ring flange 12 of maring force transducer on the base, have the vertical long and thin shaft-like test piece 7 of laying between the sensor of maring and pressure head 6, by both ends to the test piece loading. The utility model discloses produced burden step power value's size can be adjusted by a wide margin, adaptable in various different shapes, the dynamic calibration of the force sensor of different weight.

Description

Device to making dynamic calibration for force sensor

The utility model belongs to the sensor test field, relates to the improvement to the force transducer dynamic calibration apparatus.

To making dynamic calibration for force sensor is crucial.Timing signal need act on sensor with a negative step force.Adopt in the existing method and drop hammer or shaking table or the negative step force of shock tube generation, they have shortcoming separately.The frequency range of the power that produces of dropping hammer is narrow.Shaking table can't drive the big sensor of quality.Shock tube is all inapplicable to sensor, the quality of frequency below 5KHz big sensor and sensor in irregular shape.There is one piece of article " research of the Dynamic Repeatability of force transducer, the linearity and improvement in performance " (hereinafter to be referred as " research ") 1994 the 8th the 2nd phases of volume of " test journal " supplementary issue that China military engineering meeting measuring technology association publishes, and wherein the P53-54 page or leaf discloses a kind of method and apparatus that produces negative step force.This method is that the hard brittle material sheet is clipped in by between calibration sensor and the charger, when the hard brittle material sheet hold can't stand load fracture after, force transducer just obtains a negative step force.Change the step force value by the physical dimension that changes the hard brittle material sheet.It is which kind of material and available minimum force value that this article does not indicate used.The load mode that adopts in the literary composition is to apply resistance to bending to the hard brittle material sheet, promptly loads between two fulcrums that holding in the palm the hard brittle material sheet.The frequency range of the sensor that this kind caliberating device is demarcated is narrow, can not satisfy the needs of various sensors.

The purpose of this utility model is: provide a kind of wide frequency range, the power value is changeable, be applicable to the dynamic calibration apparatus of various sensors.

The technical solution of the utility model is: a kind of force transducer dynamic calibration apparatus, the pressure head 6 that comprise frame, be fixed on the hydraulic cylinder 3 of frame one end, is promoted by hydraulic cylinder, the force transducer of being demarcated 11 are fixed on the other end of frame, it is characterized in that, frame by base 13, perpendicular to two columns 1 of base be connected with column and can form along the crossbeam 2 that column is adjusted up and down; On base, there is one to lay the ring flange 12 of being demarcated force transducer, the test specimen 7 of the elongated rod-shaped of vertically laying is arranged between sensor of being demarcated and pressure head 6; Have 8, two carriage holders of carriage of location test specimen a test specimen posting 9 with test specimen 7 corresponding positions on each column 1, the upper end joined with pressure head after test specimen 7 passed pilot hole on the test specimen posting, and lower end and sensor join.The utility model is that the application people is the matching used device of disclosed method in the application for a patent for invention " to the method for making dynamic calibration for force sensor ", when therefore using the utility model to demarcate the dynamic perfromance of force transducer, needs to use above-mentioned patented method.The choice criteria of the material of test specimen 7 is to get

Be worth high material, particularly stupalith.The anti-pressure ability of pottery is very strong, so can produce and transmit the more negative step of value; The bending resistance of pottery is very weak, so can produce and transmit the negative step than small value force again, it is the good material of making test specimen.Compared with prior art, principal feature of the present utility model is that test specimen is taked the mode of vertically laying, and loads from its two ends along its length direction.When adopting the mode of vertically-arranged test specimen, test specimen be done the growth thin rod shape, slenderness ratio is 5: 1～20: 1.In this load mode, test specimen is subjected to the pressure along its length direction, and when reaching certain numerical value, test specimen bends, ruptures.Change the physical dimension or the cross sectional shape of test specimen, can obtain different negative step force values.Often the test specimen cross section of using is square or rectangle.Also can be circular, annular polygon.Use device of the present utility model, also can take the mode of horizontal loading, at this moment the mode with prior art is identical.

The utility model has the advantages that the size of the negative step force value that it produced can be regulated in significantly, can adapt to the requirement of various sensors, the wide frequency range of its demarcation, can reach more than the 100KHz, and be applicable to various difformities, the demarcation of the force transducer of Different Weight.

Description of drawings.Fig. 1 is the utility model structural drawing.Fig. 2 is the front view of test specimen posting.Fig. 3 is the vertical view of test specimen posting.Fig. 4 is a 5KN piezoelectric force transducer dynamic calibration curve of output.Fig. 5 is a 10KN strain force sensor dynamic calibration curve of output.Fig. 6 is a 30KN strain force sensor dynamic calibration curve of output.Fig. 7 is the frequency characteristic that the 5KN piezoelectric force transducer obtains after demarcating.The utility model is described in further detail below in conjunction with accompanying drawing.

Provide oil cylinder required hydraulic power by hydraulic workstation among Fig. 1.The output signal of the force transducer of being demarcated is write down and is analyzed by instantaneous state recorder and computer system.The sensor of being demarcated among Fig. 1 deposits portion, also can put top, and at this moment, oil cylinder deposits portion.In order to keep the verticality of test specimen 7,, flat by two carriages again by a test specimen posting 9 the holder of test specimen posting with the test specimen location, can guarantee that the verticality of test specimen meets the demands.The test specimen posting can have different structures.Fig. 2,3 provides a kind of embodiment, adopts a rectangular frame, and there is the pilot hole 15 of perforation at its center, and there is the edge 14 of protrusion the framework top, can hang on carriage 8.For the fragment that prevents test specimen at timing signal splashes, can also increase protective device.For example be lined with pad 10 between sensor of being demarcated 11 and test specimen 7, between pressure head 6 and the hydraulic cylinder 3 dividing plate 5 arranged, protective housing 4 on the frame outer cover.These unit protection sensors, oil cylinder are also protected operating personnel's safety not by the damage of the fragment in the test.Use the Fig. 4 to Fig. 7 that the results are shown in of dynamic calibration that the utility model does different force transducers.The utlity model has good result of use as can be seen.

Claims

1, a kind of force transducer dynamic calibration apparatus, the pressure head (6) that comprise frame, be fixed on the hydraulic cylinder (3) of frame one end, is promoted by hydraulic cylinder, the force transducer of being demarcated (11) are fixed on the other end of frame, it is characterized in that,

(1), frame by base (13), perpendicular to two columns (1) of base be connected with column and can form along the crossbeam (2) that column is adjusted up and down;

(2), on base, have one to lay the ring flange (12) of being demarcated force transducer, the test specimen (7) of the elongated rod-shaped of vertically laying is arranged between sensor of being demarcated and pressure head (6);

(3), go up with the corresponding position of test specimen (7) at each column (1) carriage (8) of locating test specimen is arranged, a test specimen posting (9) in two carriage holders, the upper end joined with pressure head after test specimen (7) passed pilot hole on the test specimen posting, and lower end and sensor join.

2, caliberating device according to claim 1 is characterized in that, is lined with pad (10) between sensor of being demarcated (11) and the test specimen (7), between pressure head (6) and the hydraulic cylinder (3) dividing plate (5) is arranged.

3, caliberating device according to claim 1 and 2 is characterized in that, is with protective housing (4) in the frame outside.