CN2109562U

CN2109562U - Micro torque testing instrument

Info

Publication number: CN2109562U
Application number: CN 91233081
Authority: CN
Inventors: 钱向勇
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 1991-12-27
Filing date: 1991-12-27
Publication date: 1992-07-08

Abstract

The utility model relates to a micro torque testing instrument. A measured part is fixed on a working bench. A rotating shaft of a motor is connected with a main shaft of the measured part through a rigid shaft coupling, and the motor is installed in a hole of a force arm support. The swinging of the motor enables force-measuring beads arranged on the force arm support to generate varying contact force on a pressure sensor, so the pressure sensor is deformed, and an electrical measurement signal is generated. After the signal is sent into an electrical measurement component and enlarged, the average value of dynamic friction torque is directly read by a digital display part or the dynamic drift curve of the torque is directly drafted by a recorder. The micro torque testing instrument has the advantages of continuous dynamic measurement and high measuring accuracy. The utility model can be used for micro torque testing instrument of both cylindrical and various non-cylindrical driving devices.

Description

Micro torque testing instrument

The utility model relates to the device of measuring torque, especially a kind of little torque tester.

In the prior art field, widely apply mechanical counter, little torque (being commonly referred to as moment of friction) of this class counter is about 1～50N.mm, and the size of moment of friction is one of important indicator of weighing counter quality quality.The method that moment of friction is measured by the producer that produces at present counter has two kinds substantially: a kind ofly be, static determination, promptly on the arm of force of given length, increase progressively counterweight weight one by one, when the arm of force just begins to rotate, the counterweight weight of this moment and the product of arm of force square as the moment of friction value, what this method was measured is the static friction torque value, it or not the dynamic friction torque value, but also because the characteristics of mechanical counter rising space mechanism, moment of friction is the sudden change formula, therefore this method is difficult to survey the moment of friction value under the accurate various states, more can not reflect the size of the dynamic friction torque under the actual working state.Another kind is that hand pulling type dynamometry table method is promptly in the size of dynamically testing pulling force down, but because the instability of state of tension, the heavy curtain of the mobile and indicator of dynamometry table is moving, so cause the vision reading error big, can only estimate approx and read maximum dynamic friction torque, this method tension line length restriction, can only divide the section test, very bother, this method will be read unsettled indicator value at the utmost point in the short time, can make the testing staff be in the tense situation of height, very easily produce mistake.

The purpose of this utility model provides a kind of little torque tester, measured piece is fixed on the worktable, machine shaft is connected by positive coupling with the measured workpiece main shaft, adopt the method for swing motor, arrive the electrical measurement parts by signal of sensor, can demonstrate the curve of mean kinetic friction force square value or the dynamic change of record moment, thereby overcome the deficiency of prior art.

The technical solution of the utility model is that it comprises power part, dynamometry parts, worktable part.Power part: comprise the motor that is installed in the arm of force frame hole, the dynamometry pearl on the arm of force frame is because the swing of motor, can with pressure transducer clutch mutually, the rotating shaft of motor is connected by positive coupling with the main shaft of measured piece on being installed in worktable; The dynamometry parts: comprise can with dynamometry pearl on being contained in the arm of force frame pressure transducer of clutch mutually, the output terminal of pressure transducer is connected with the electrical measurement parts; Worktable part: by elevating screw that lifting table is moved up and down and the lifting table that is fixed with nut, upper knob that is fixed with pinion wheel and tooth bar that platen is travelled longitudinally can make worktable make the cogged lower knob of being connected of transverse movement and tooth bar is formed.

The utility model has the advantages that: adopt the continuously dynamic method of testing of motor branch counter moment, replaced the manual test method of traditional interrupted, low precision, so the measuring accuracy height; Adopt the test structure of motor swing, the signal that pressure transducer receives behind the electrical measurement parts, can directly be read mean kinetic friction force square value by the digital display part, can directly draw out the moment dynamic changing curve by registering instrument again; Not only can be used for (for example: motor, little speed reduction unit etc.) the little torque measurement, and (for example: little torque measurement various counters etc.) can be used for various non-cylindrical gearings of cylindrical gearing.

The main technical detail of this little torque tester:

Reading sensitivity: 1N.mm

Test specification: 1～200N.mm

Measure revolution: 0～300r.p.m

The utility model will be further described below in conjunction with accompanying drawing.

Fig. 1, front view of the present utility model;

Fig. 2, vertical view of the present utility model;

Fig. 3, A-A of the present utility model are to view.

As shown in Figure 1 and Figure 2, installment work platform parts, dynamometry parts, electrical measurement parts and base etc. on base 1.Worktable part is by upper knob 2, transverse movement gear 3, elevating screw 4, bearing seat 5, lifting table 6, lifting support 7, vertical platen 8, worktable 9, measured piece positioning seat 17, lifting turntable 18 compositions such as grade; Rotary turnplate 18 can drive the gear rotation that is fixed together with screw mandrel 4, thereby screw mandrel 4 is rotated in bearing seat 5, and the nut that is connected with lifting table 6 is subjected to the restriction of bearing 7, forces lifting table 6 to move up and down; Rotation upper knob 2 then drives tooth bar with the pinion wheel that upper knob 2 is connected, and platen 8 is travelled longitudinally; The rotation lower knob then is enclosed within axle in upper knob 2 holes by sky, and gear 3 is rotated, and drives tooth bar, makes worktable 9 do transverse movement; Screw in the positioning of rotating seat 17 can make workpiece be pressed on the rib of worktable 9, and the worktable that this three-dimensional is adjustable mainly is in order to adapt to measured piece profile difference, the inconsistent needs in projecting shaft position.Dynamometry parts: form by the pressure transducer 12 that is contained on the U-shaped frame 13; adjusting lever 10 on the U-shaped frame 13 is by the level of the adjustable seamless force transducer 12 of screw thread; baffle plate 11 is fastened on the pressure transducer 12, can prevent the pressure transducer overload, and protects the foil gauge of its bottom.Power part: be installed in motor force jib 16 holes by trip bolt by motor 14, dynamometry pearl 15 on the arm of force frame 16, because the swing of motor 14, the contact pressure that can change to pressure transducer 12, thereby make the pressure transducer distortion, produce electromotive signal, be sent to the electrical measurement parts and carry out processing and amplifying, by display, can directly read mean kinetic friction force square value or draw the moment dynamic changing curve by registering instrument.The rotating shaft of motor 14 is connected by positive coupling 28 with the main shaft of measured piece 29.Then motor 14 for supporting structure is placed in the supporting 31, at this moment can allow to adopt flexible coupling to connect.

As Fig. 1, shown in Figure 3, V-arrangement carriage 22 slides on the base 25, rotates the tilting mechanism of being made up of eccentric wheel 26 and swing arm 23, can make carriage 22 and motor 14 clutch mutually.When push rod 19 presses down

swing arm

23,24 rotations of eccentric wheel 26 moving axles, thereby carriage 22 is risen, the motor pop-up, the pop-up height is by tip-lever support 20 decisions, the screw mandrel 27 that rotation links to each other with adjustment rack 21 makes tip-lever support 20 move up and down by means of dovetail guide, thus the position of fine-tuning tip-lever support 20.

The output signal of pressure transducer 12 is sent into electrical measurement parts 30, through differential amplification and after after level amplifies, obtain voltage output corresponding to 1mV/10mN, wherein one the tunnel after the RC low-pass filtering, directly reading mean kinetic friction force square value by the digital display part, is 100mm as the test arm of force, and pressure shows 1mV, corresponding to 10mN, i.e. 10mN * 100mm=1000mN.mm=1N.mm; Another road is sent through follower, and the input end of external registering instrument (as: external pen recorder, or light oscillograph) can directly be drawn out the moment dynamic changing curve.

Claims

1, a kind of little torque tester comprises power part, test component, and feature of the present utility model is:

A. power part: comprise the motor [14] that is installed in arm of force frame [16] hole, the dynamometry pearl [15] of arm of force frame [16] is because the swing of motor [14], can with pressure transducer [12] clutch mutually, the rotating shaft of motor [14] is connected by positive coupling [28] with the main shaft of measured piece [29] on being installed in worktable [9];

B. dynamometry parts: comprise can with dynamometry pearl [15] pressure transducer of clutch [12] mutually, the output terminal of pressure transducer [12] is connected with electrical measurement parts [30];

C. worktable part: by elevating screw [4] that lifting table [6] is moved up and down and the lifting table [6] that is fixed with nut, upper knob that is fixed with pinion wheel [2] and tooth bar that platen [8] is travelled longitudinally, the lower knob and the tooth bar that are fixed with gear [3] that can make worktable [9] do transverse movement are formed.

2, little torque tester according to claim 1, it is characterized in that: the V-arrangement carriage (22) of motor (14) slides on the base (25), the tilting mechanism that rotation is made up of eccentric wheel (26) and swing arm (23) can make carriage (22) and motor (14) clutch mutually.