CN2233579Y

CN2233579Y - Bending stress and pressure bar stabilizing tester

Info

Publication number: CN2233579Y
Application number: CN 95211860
Authority: CN
Inventors: 吕荣坤; 柳新法; 黄玎玎
Original assignee: Zhejiang University ZJU
Current assignee: Zhejiang University ZJU
Priority date: 1995-05-18
Filing date: 1995-05-18
Publication date: 1996-08-21
Anticipated expiration: 2005-05-18

Abstract

The utility model relates to a bending stress and pressure rod stabilizing test machine. A frame composed of four vertical columns is arranged between a working platform and a cross beam; a supporting seat provided with a supporting roller is respectively arranged on a left and a right vertical columns at the same height; the center of the cross beam is provided with a threaded rod which forms a screw pair with a worm gear hole; a worm gear drives the threaded rod to move up and down; one end of the threaded rod is provided with a force sensor connected with a force display through a leading wire; the force sensor can be provided with a squeeze head, or a V-shaped supporting seat, or a flat squeeze head; the tests of bending positive stress, pressure rod critical pressure, and small sample compression failure can be carried out. The machine has compact structure, safe and convenient operation and high testing precision, and the utility model can be used for teaching experiments.

Description

The dual-purpose testing machine of bending stress and pressure bar stabilization

The real novel device that relates to mechanical force test solid material intensity of this usefulness.

Bending normal stresses distribution electrical testing inspection and depression bar emergent pressure are measured, be that institution of higher learning, special secondary school and the student of technical school are lecturing the education experiment project that must carry out behind the mechanics of materials course, this binomial nondestructive test of past is all at fluid pressure type or carry out on having than the universal testing machine of large space, but there is the problem of following several respects in it:

(1) common hydraulic universal testing machine all adopts manual the loading, and it is bigger to accomplish steadily to load difficulty when the student operates the computer, and has both influenced test accuracy, and the overload failure test piece easily takes place again the work careless manipulation, and the past, this class accident occurred repeatedly.The workpiece size of bending test is big, carry out grinding, the machining precision height, and to post strainometer in advance, and be difficult for obtaining in a short time changing in case damage, influence teaching efficiency.

(2) the present unit price of homemade hydraulic universal testing machine is all more than several ten thousand yuan, acquire difficult to the school that generally has quite modest financial resources, be fit to do the testing machine that the depression bar test has big test space even the more important thing is, tonnage is all higher, and the depression bar test only needs the test power of hundreds of kilogram, and test error is bigger.

Though the miniaturization testing machine is arranged on market, function singleness or modelling too are unfavorable for promoting the use of.

The purpose of this utility model is: provide a kind of bending stress and pressure bar stabilization dual-purpose testing machine, be suitable for mechanics of materials education experiment and use, have the miniaturization testing machine of certain advance, so that overcome the problem that exists in the background technology.

The technical solution adopted in the utility model is: the main frame load bearing component: comprise the framework that four columns are formed is housed between workbench on the base and crossbeam, the bearing of making bending test is housed respectively on the sustained height of left and right pillar, one group of roller of settling sample is housed respectively on the bearing; Loading component: be included in the crossbeam center screw rod is housed, screw rod and worm wheel aperture form screw pair, and rotating worm couple drive screw rod can move up and down; Dynamometry parts: be included in screw rod one end force transducer is housed, be connected with the power display through lead-in wire.

Pressure head is housed on force transducer, or the V-type bearing is housed on force transducer, another V-type bearing with the same axis of V-type bearing is housed on the workbench; Or the concora crush head is housed on force transducer, the hoistable platform with the same axis of concora crush head is housed on the workbench.

The utility model is compared the useful effect that is had with background technology:

1. adopt the loading system of manual worm gear worm gear pair, can slowly observe the mechanical behavior that shows in the sample loading process for non-destructive testing (NDT), both laborsaving, safety, convenience, and obtain result accurately easily;

2. power value display digitization, reading is accurate;

3. corresponding specimen size is dwindled, and is convenient to processing, and expense reduces;

4. the employing portable structure can make full use of the test site;

5. suitably expand annex, also can do stretching, compression, the fail in bending test of small-sized sample.

Therefore, the utility model can be done the use of mechanics of materials education experiment to the student in institution of higher learning, special secondary school and technical school.

Below in conjunction with accompanying drawing,, provide details of the present utility model by description to embodiment.

Fig. 1, structural representation of the present utility model;

Fig. 2, A-A cut-open view of the present utility model;

Fig. 3, left view of the present utility model;

Fig. 4, bending normal stresses test synoptic diagram;

Fig. 5, depression bar emergent pressure test synoptic diagram;

Fig. 6, small sample fail in compression test synoptic diagram.

As Fig. 1, Fig. 2, shown in Figure 3, the main frame load bearing component is the framed structure that four columns 5 are formed, this structure is not only stable but also can have higher loading space, so that realize the stability test of elongated depression bar, one end of column 5 is fixed on the workbench 2 of base 1, and the other end of column 5 is with crossbeam 11 and fixing with nut 7.The screw rod 9 that is contained in crossbeam 11 centers drives worm couple 8 rotations by rotating handwheel 12, and screw rod 9 is moved up and down, and realizes sample is loaded.Bearing 3 is housed respectively on the sustained height of left and right pillar, and on column, fixes, can reduce to load the length of screw rod 9 like this, one group of roller 4 of settling sample is housed respectively on the bearing 3.One end of screw rod 9 is equipped with force transducer 6, is connected with power display 10 with lead-in wire.

As shown in Figure 4, about settle the sample 15 that posts strainometer 16 on the roller 4, pressure head 13 is housed on the force transducer 6, rotate worm couple 8, exert pressure by

pressure head

13,14 pairs of samples 15 of reinforcing girder, show, can carry out the bending normal stresses test through power display 10.

As shown in Figure 5, at V-type bearing 17, a 17 ' dress depression bar sample 18, force transducer 6 is contacted with bearing 17, rotate worm couple 8, depression bar degree sample 18 is exerted pressure, show the power value through power display 10, with the amount of deflection of dial gauge 19 pressure measuring rod, can carry out the test of depression bar emergent pressure.

As shown in Figure 6, dress compression sample 21 on hoistable platform 22, dress concora crush head 20 on force transducer 6, concora crush head 20 is contacted with compression sample 21, rotate worm couple 8, exert pressure by 20 pairs of compressions of concora crush head sample, show, can carry out the test of small sample fail in compression through power display 10.

Claims

1. bending stress and the dual-purpose testing machine of pressure bar stabilization, it comprises main frame load bearing component, loading component and dynamometry parts, it is characterized in that:

1) main frame load bearing component: comprise the framework that four columns [5] are formed is housed between workbench [2] on the base [1] and crossbeam [11], the bearing [3] of making bending test is housed respectively on the sustained height of left and right pillar [5], one group of roller [4] of settling sample is housed respectively on the bearing [3];

2) loading component: be included in crossbeam [11] center screw rod [9] is housed, screw rod [9] forms screw pair with worm wheel aperture, and rotating worm couple [8] drive screw rod [9] can move up and down;

3) dynamometry parts: be included in screw rod [9] one ends force transducer [6] is housed, be connected with power display [10] through lead-in wire.

2. bending stress according to claim 1 and the dual-purpose testing machine of pressure bar stabilization is characterized in that: pressure head [13] is housed on force transducer [6].

3. bending stress according to claim 1 and the dual-purpose testing machine of pressure bar stabilization is characterized in that: V-type bearing [17] is housed on force transducer [6], another V-type bearing [17 '] with the same axis of V-type bearing [17] is housed on the workbench [2].

4. bending stress according to claim 1 and the dual-purpose testing machine of pressure bar stabilization is characterized in that: concora crush head [20] is housed on force transducer [6], the hoistable platform [22] with the same axis of concora crush head [20] is housed on the workbench [2].