CN2298514Y

CN2298514Y - Lever-type bend tester

Info

Publication number: CN2298514Y
Application number: CN 97239792
Authority: CN
Inventors: 刘雅儒; 王继龙
Original assignee: NORTHWEST BUILDING ENGINEERING COLLEGE
Current assignee: NORTHWEST BUILDING ENGINEERING COLLEGE
Priority date: 1997-07-18
Filing date: 1997-07-18
Publication date: 1998-11-25
Anticipated expiration: 2007-07-18

Abstract

The utility model discloses a lever type bend tester. The utility model is characterized in that both ends of a test piece are supported by bearing shafts on two bearing seats fixed to a cast iron base board, wherein a first stage stress application rod and a second stage stress application rod apply load to the middle upper part of the test piece through four turn-buckles, wire cables and a load sensor; a reduction gear is of a worm wheel screw rod type, a hand wheel is fixedly connected with the screw rod, and thus, the utility model has the function of load locking. The utility model has the advantages of safety design, simple manufacturing technique, low cost and wide application range, and is especially suitable for the teaching and the test of colleges and universities.

Description

The lever Apparatus for Bending at low-temp

The utility model relates to a kind of charger of non-destructive stress determination experiment of beam, particularly a kind of lever Apparatus for Bending at low-temp.

In the category of the mechanics of materials, the non-destructive normal stress of beam and principle stress determination test, requirement to loading equipemtn is relatively harsher, promptly require loading equipemtn to have " load locking " function of long period, had only for 30 seconds and be mainly universal hydraulic testing machine " load locking " time index that stretching, compression, crooked destructive test design and produce.At present, domestic authority's material mechanics experiment teaching material is hydraulic universal experimental machine or pressing machine to above-mentioned two test appointed equipment, but because the time of the said equipment " load locking " is too short, impacts so just for offering of above-mentioned two laboratories.The nineties; the Jinan experimental machine is made main office and is introduced day island proper Tianjin technology; the WAW series universal testing machine of associating manufacturing has good " permanent experiment power " (i.e. " load locking ") function; (more than 40 ten thousand yuan in the separate unit main frame but it costs an arm and a leg; total price reaches five after adding random; 600,000 yuan); the general unable purchase of teaching unit; according to the minimum requirements (the table of equipment tricks that be every experiment will reach 5 covers) of State Education Commission, more make general ordinary higher learning school laboratory feel to be difficult to finish above-mentioned two experiments according to the standard of State Education Commission to colleges and universities' basic course Laboratory Evaluation.On the other hand, the power precision of showing of high-power test machine is one of its key technical indexes.Traditional load maintainer is made up of high-pressure oil pump and operating cylinder, piston etc., it shows that force signal takes out by dual mode, a kind of is (for example to take out from oil cylinder, the WE Series Hydraulic formula universal testing machine that Jinan testing machine factory produces), another kind is (for example to take out from the oil-out of high-pressure oil pump, the JYE-2000A type fluid pressure type building materials pressure testing machine that Jinan testing machine factory produces), its show the relative error of power value be ± 1% (from design load 20%), its test accuracy is not high.

The purpose of this utility model provides a kind of lever Apparatus for Bending at low-temp, the principle stress of I-beam, the normal stress of pure bending beam, the multiple tests such as deflection deformation of beam both can have been measured, also can improve and measure precision, reduction equipment cost, fully overcome the deficiencies in the prior art.

Realization of the present utility model: describe below in conjunction with accompanying drawing.

Accompanying drawing 1 is a structural representation of the present utility model.

As shown in the figure, two Pressure Blocks (4) that are fixed on the cast iron base plate (16) are supporting type connection alive by two backup rolls (5) that are provided with thereon to test specimen (15) two ends respectively, two locksets (7) lower end that is distributed in test specimen (15) both sides is fixed on the cast iron base plate (16), the end of its upper end by axle (9) and secondary boosting-rod (13) is rotary type and is solidly connected, two locksets (14) lower end that is distributed in the test specimen both sides is fixed on the cast iron base plate, the end of its upper end by axle (12) and one-level boosting-rod (8) is rotary type and is solidly connected, secondary boosting-rod (13) is by power transmission pressure head (11) and one-level boosting-rod (8) and contacts, and be by load sensor (10) and test specimen (15) middle and upper part and contact, the steel cable (6) that an end of one-level boosting-rod (8) fixedly installs feeds worm gear screw reduction gear (3).This reduction gear (3) is fixedly set on the cast iron base plate (16), and the screw rod in the handwheel of its outer setting (2) and the reduction gear (3) is and is solidly connected, and makes this reduction gear have auto-lock function.Cast iron base plate (16) bottom is provided with mounting (1).Lockset (7), (14) are selected four wire tensioners for use.

Below in conjunction with the course of work the utility model is described further.At first test specimen (15) is positioned on the backup rolls (5) on Pressure Block (4) top; Adjust the lockset (14) of one-level boosting-rod (8) both sides and the lockset (7) of secondary boosting-rod (13) both sides more respectively and make vertical test specimen (15) middle and upper part that compresses of load sensor (10); Secondly by handwheel (2) worm gear screw reduction gear (3) is started.Because what reduction gear adopted is the worm gear screw, screw rod and handwheel (2) are power source, therefore have AutoLock feature.When rotating handwheel (2) when starting reduction gear (3) and making steel cable (6) reinforcing causes certain numerical value to test specimen (15) by one-level boosting-rod (8), transmission pressure head (11), secondary boosting-rod (13), load sensor (10), automatically lock.The data that gathered by load sensor (10) this moment can be read by digital watch (17), can be read by deflection measuring apparatus by the data that the clock gauge (19) that is arranged at test specimen (15) middle part is gathered.

Advantage of the present utility model and good effect: 1. the lever Apparatus for Bending at low-temp shows the power value when design load 50KN, relative error index ± 0.8%, and degree of accuracy is higher; In whole working except that deadweight, externally be not show power, that is to say that to the big load test of test specimen, the staff is safer; 3. adopt worm gear screw reduction gear, can " lock load "; 4. manufacturing process is simple, and production cost is extremely low, is suitable for and applies, and is particularly suited for the teaching test of colleges and universities.

Claims

1, a kind of lever Apparatus for Bending at low-temp, it is characterized in that: two Pressure Blocks (4) that are fixed on the cast iron base plate (16) are supporting type connection alive by two backup rolls (5) that are provided with thereon to test specimen (15) two ends respectively, two locksets (7) lower end that is distributed in test specimen (15) both sides is fixed on the cast iron base plate (16), the end of its upper end by axle (9) and secondary boosting-rod (13) is rotary type and is solidly connected, two locksets (14) lower end that is distributed in the test specimen both sides is fixed on the cast iron base plate, the end of its upper end by axle (12) and one-level boosting-rod (8) is rotary type and is solidly connected, secondary boosting-rod (13) is by power transmission pressure head (11) and one-level boosting-rod (8) and contacts, and be by load sensor (10) and test specimen (15) middle and upper part and contact, the steel cable (6) that an end of one-level boosting-rod (8) fixedly installs feeds worm gear screw reduction gear (3).

2, testing machine according to claim 1 is characterized in that: lockset (7), (14) are selected four wire tensioners for use.

3, testing machine according to claim 1 is characterized in that: the screw rod of reduction gear (3) and handwheel (2) are solidly connected.