CN204807242U - Roof beam distributing of stress law test instrument with adjustable - Google Patents

Abstract

The utility model relates to an adjustable tester for the distribution law of beam stress, which is characterized in that it comprises an experimental beam, an experimental beam support, an experimental bench, a loading rod, a worm lifting mechanism, and a hand wheel for driving the worm lifting mechanism to go up and down and load-bearing beams. The experimental beam is placed on the experimental beam support, the experimental beam support is installed above the experimental bench, and the handwheel and worm lifting mechanism are installed on the experimental bench between the experimental beam and the lower beam. The loading bar includes a height-adjustable experimental beam fixing seat, a tie rod and a bearing capacity lower beam fixing seat. The upper end of the pull rod is detachably connected with the fixed seat of the experimental beam, and the lower end is connected with the fixed seat of the lower beam under bearing capacity. The test beam is installed through the fixed seat of the experimental beam, and the beam under the bearing capacity is installed through the fixed seat of the beam under the bearing capacity; one side of the fixed seat of the experimental beam is movably connected with a positioning scale. The utility model can meet the stress testing requirements of beams of different lengths and sizes.

Description

An Adjustable Beam Stress Distribution Law Test Apparatus

technical field

The utility model relates to the technical field of teaching experiment instruments, in particular to an adjustable beam stress distribution rule tester.

Background technique

In order to allow students in colleges and universities to better learn and master the principles of engineering material mechanics, colleges and universities take the beam stress distribution law test as a compulsory subject for related engineering majors. The beam stress distribution law tester is one of the commonly used engineering material mechanics experimental instruments, which is used to measure the stress distribution law of beams. However, the existing beam stress distribution law tester cannot meet the stress test requirements of beams of different lengths and sizes, and it is very inconvenient to operate, which greatly reduces the scope and effect of experimental teaching.

Utility model content

The purpose of this utility model is to provide an adjustable beam stress distribution law tester, which can solve the deficiencies in the prior art and meet the stress test requirements of beams of different lengths and sizes, and is easy to operate It is simple and convenient, thereby expanding the scope of experimental teaching and enhancing the effect of experimental teaching.

In order to achieve the above object, the utility model adopts the following technical solutions:

An adjustable beam stress distribution law tester includes an experimental beam, an experimental beam support, an experimental bench, a loading rod, a worm lifting mechanism, a hand wheel for driving the worm lifting mechanism, and a bearing capacity lower beam.

The test beam is placed on the test beam support, and the test beam support is installed above the test bench, and the handwheel and worm lifting mechanism are installed on the test bench between the test beam and the lower beam under bearing capacity.

The loading rod includes a height-adjustable test beam fixing seat, a pull rod and a bearing capacity lower beam fixing seat; the upper end of the pulling rod is detachably connected with the experimental beam fixing seat, and the lower end is connected with the bearing capacity lower beam fixing seat; the experiment The beam is installed through the fixed seat of the experimental beam, and the beam under the bearing capacity is installed through the fixed seat of the beam under the bearing capacity; one side of the fixed seat of the experimental beam is movably connected with a positioning scale.

Further, the experimental beam support includes a support body, a U-shaped groove disposed above the support body, and a support beam disposed in the U-shaped groove.

Further, the test bench includes a test bench, a connecting frame and a supporting base sequentially arranged from top to bottom; the test bench is H-shaped, including two limit plates arranged in parallel and arranged between the two limit plates. The support bearing plate between the bearing plates is provided with a waist-shaped hole for the loading rod to pass through and adjust the distance between adjacent loading rods; the connecting skeleton is two longitudinal support beams arranged in parallel. A handwheel bracket is provided between the two longitudinal support beams; the support base includes two load-bearing horizontal beams arranged in parallel and two load-bearing connecting beams vertically arranged between the two load-bearing horizontal beams; An adjustable base for ensuring the level of the device is provided at the two end corners, and the adjustable base includes a base and an adjusting bolt threadedly connected with the base.

Further, the experimental beam fixing seat includes a threaded stress rod, a first threaded connecting rod and two connecting plates arranged in parallel; the middle of the threaded stressed rod is a stressed rod, and the two ends are threaded connection parts; The first threaded connecting rod is a fully threaded connecting rod; the upper and lower ends of the connecting plate are respectively threaded with the threaded stress rod and the first threaded connecting rod, and the connecting plate is provided with several threaded connecting holes.

The bearing capacity lower beam fixing seat includes a U-shaped connecting frame with an opening downward and a second threaded connecting rod installed through the lower end of the U-shaped connecting frame; a threaded connection hole is provided on the side of the U-shaped connecting frame.

Further, the worm lifting mechanism includes a worm connected to the hand wheel, a worm wheel meshed with the worm, a lead screw passing through the middle of the worm wheel and meshed with the worm wheel, and a pressure head connected to the bottom of the lead screw.

Further, the positioning scale is movably connected to one end of the threaded stress rod, and the upper end of the positioning scale is provided with a scale, and the lower end is provided with a waist-shaped hole for moving the positioning scale.

Further, a pressure sensor is provided on the pressure head.

Further, the handwheel includes a wheel rib, a rim and a handle. The handle makes it easy to turn the handwheel.

It can be seen from the above technical scheme that the utility model can realize the stress distribution test of beams of different sizes by setting a plurality of threaded connection holes on the connecting plate; The distance between the two loading rods at both ends of the beam is adjusted, so as to realize the experimental test of the stress distribution of beams of different lengths. The utility model not only has simple and convenient operation and high experiment efficiency, but also expands the teaching experiment scope and enhances the teaching experiment effect.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is the top view of the utility model;

Fig. 3 is the structural representation of experimental beam support;

Fig. 4 is the side view of experimental beam support;

Fig. 5 is the top view of experimental beam support;

Fig. 6 is the structural representation of experimental bench;

Fig. 7 is the top view of experimental bench;

Fig. 8 is a schematic structural view of the loading rod;

Figure 9 is a side view of the loading rod;

Fig. 10 is a schematic structural diagram of the test bench;

Figure 11 is a side view of the test bench;

Fig. 12 is the top view of experimental platform;

Fig. 13 is a structural schematic diagram of a positioning scale;

Fig. 14 is a schematic diagram of the structure of the handwheel.

in:

1. Experimental beam, 2. Experimental beam support, 3. Loading rod, 4. Hand wheel, 5. Experimental bench, 6. Adjustable base, 7. Lower bearing capacity beam, 8. Pressure head, 9. Sensor, 10. Worm lifting mechanism, 11. Positioning scale, 21. Support main body, 22. Support beam, 23. U-shaped groove of support, 31. Thread force rod, 32. Connecting plate, 33. First threaded connecting rod , 34, pull rod, 35, U-shaped connecting frame, 36, the second threaded connecting rod, 41, wheel rib, 42, rim, 43, handle, 111, scale, 112, waist-shaped hole for moving the positioning scale, 51. Experiment bench, 52. Handwheel bracket, 53. Connecting frame, 54. Support base, 511. Limiting plate, 512. Support bearing plate, 513. Used for loading rods to pass through and adjust between adjacent loading rods Spaced waist holes.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described:

An adjustable beam stress distribution law tester as shown in Figures 1-2, including an experimental beam 1, an experimental beam support 2, an experimental bench 5, two loading rods 3, a worm lifting mechanism 10, and Drive the hand wheel 4 and the load-bearing lower beam 7 of the lifting mechanism of the worm. The worm lifting mechanism 10 includes a worm connected to the hand wheel, a worm wheel meshed with the worm, a lead screw passing through the middle of the worm wheel and meshed with the worm wheel, and a pressure head 8 connected to the bottom of the lead screw. A pressure sensor is provided on the pressure head 8 . When the hand wheel rotates, it drives the worm to rotate, and the worm transmits its rotation to the worm wheel, and the worm wheel then transmits it to the lead screw, so that the lead screw can descend with the rotation of the hand wheel, and then the pressure head can move up and down in a straight line driven by the hand wheel , the indenter produces a certain pressure on the lower beam 7 of the bearing capacity, so that the lower beam 7 of the bearing capacity moves downward, and drives the loading rod 3 to pull the experimental beam 1, thereby completing the stress test.

As shown in FIGS. 3-5 , the experimental beam support includes a support body 21 , a U-shaped groove 23 disposed above the support body 21 , and a support beam 22 disposed in the U-shaped groove. The experimental beam 1 is placed in the U-shaped groove 23 . The design of the support beam is to ensure that the force of the experimental beam can fall on the support beam, and thus fall on the main body of the support. Make sure that the test beam does not deflect the supports due to uneven loading.

As shown in FIGS. 6-7 , the test bench 5 includes a test bench 51 , a connecting frame 53 and a supporting base 54 arranged sequentially from top to bottom. As shown in Figures 11 and 12, the test bench 51 is H-shaped, comprising two limiting plates 511 arranged in parallel and a bearing bearing plate 512 arranged between the two limiting plates 511, the bearing The loading plate 512 is provided with two waist-shaped holes 513 for the loading rods to pass through and to adjust the distance between adjacent loading rods. The connecting frame 53 is two longitudinal support beams arranged in parallel, and a handwheel bracket 52 is arranged between the two longitudinal support beams. The handwheel 4 is rotatably connected to the handwheel bracket 52 . The support base 54 includes two load-bearing horizontal beams arranged in parallel and two load-bearing connecting beams vertically arranged between the two load-bearing horizontal beams. The four end corners of the supporting base 54 are provided with adjustable bases 6 for ensuring the level of the device, and the adjustable bases include a base and adjusting bolts threadedly connected with the base. When the experimental device is placed on an uneven surface, the height of the four adjustable bases can be adjusted to ensure the level of the entire device, thereby ensuring the accuracy of the experimental results of material mechanics.

As shown in FIG. 8 and FIG. 9 , the loading bar 3 includes a height-adjustable test beam fixing seat, a pull rod 34 and a bearing capacity lower beam fixing seat. The upper end of the pull rod 34 is detachably connected with the test beam fixing seat, and the lower end is connected with the bearing capacity lower beam fixing seat. The test beam 1 is installed through the test beam fixing seat, and the bearing capacity lower beam 7 is installed through the bearing capacity lower beam fixing seat. One side of the fixed seat of the experimental beam is movably connected with a positioning scale 11 .

The test beam fixing seat includes a threaded stress rod 31 , a first threaded connecting rod 33 and two connecting plates 32 arranged in parallel. The middle of the threaded stressed rod 31 is a stressed polished rod, and the two ends are threaded connection parts. The first threaded connecting rod 33 is a fully threaded connecting rod. The upper and lower ends of the connecting plate 32 are threadedly connected with the threaded stress rod 31 and the first threaded connecting rod 33 respectively, and the connecting plate 32 is provided with several threaded connection holes. By arranging several threaded connection holes on the connecting plate 32, the distance between the threaded stress rod and the threaded connecting rod can be adjusted, so that the experimental beam fixing seat can be applied to various specifications of experimental beams.

The bearing capacity lower beam fixing base includes a U-shaped connecting frame 35 with an opening downward and a second threaded connecting rod 36 installed through the lower end of the U-shaped connecting frame 35 . A threaded connection hole is provided on the side of the U-shaped connecting frame 35 .

As shown in FIG. 13 , the positioning scale 11 is movably connected to one end of the threaded stress rod 31 , and the upper end of the positioning scale 11 is provided with a scale 111 , and the lower end is provided with a waist-shaped hole 112 for moving the positioning scale. The utility model can adjust the position of the positioning scale according to the length of the experimental beam, and accurately read the position point of the experimental test.

The above-mentioned embodiments are only described to the preferred implementation of the utility model, and are not limited to the scope of the utility model. Various modifications and improvements made should fall within the scope of protection determined by the claims of the utility model.

Claims (8)

1. An adjustable beam stress distribution law tester is characterized in that: it comprises an experimental beam, an experimental beam support, an experimental bench, a loading rod, a worm lifting mechanism, a handwheel and a bearing for driving the lifting of the worm lifting mechanism. force lower beam; The test beam is placed on the test beam support, the test beam support is installed above the test bench, and the handwheel and worm lifting mechanism are installed on the test stand between the test beam and the lower beam under the bearing capacity; The loading rod includes a height-adjustable test beam fixing seat, a pull rod and a bearing capacity lower beam fixing seat; the upper end of the pulling rod is detachably connected with the experimental beam fixing seat, and the lower end is connected with the bearing capacity lower beam fixing seat; the experiment The beam is installed through the fixed seat of the experimental beam, and the beam under the bearing capacity is installed through the fixed seat of the beam under the bearing capacity; one side of the fixed seat of the experimental beam is movably connected with a positioning scale. 2. A kind of adjustable beam stress distribution tester according to claim 1, characterized in that: said experimental beam support comprises a support main body, a U-shaped groove arranged above the support main body and a U-shaped groove arranged on the U-shaped groove. Support beams in grooves. 3. a kind of adjustable beam stress distribution rule tester according to claim 1, is characterized in that: described test bench comprises that test bench, connecting skeleton and support base are arranged successively from top to bottom; It is H type, including two limit plates arranged in parallel and a support bearing plate arranged between the two limit plates. Waist-shaped holes at intervals; the connecting skeleton is two longitudinal support beams arranged in parallel, and a handwheel bracket is arranged between the two longitudinal support beams; the support base includes two parallel bearing horizontal beams and a vertical Two load-bearing connecting beams arranged between two load-bearing horizontal beams; the four end corners of the support base are provided with adjustable bases for ensuring the level of the device, and the adjustable base includes a base and a screw threaded connection with the base Adjustment bolt. 4. A kind of adjustable beam stress distribution tester according to claim 1, characterized in that: said experimental beam fixing seat comprises a threaded stress rod, a first threaded connecting rod and two connecting plates arranged in parallel The middle of the threaded force rod is a force-bearing light rod, and the two ends are threaded connection parts; the first threaded connecting rod is a full-threaded connecting rod; the upper and lower ends of the connecting plate are respectively connected with the threaded force rod, the second A threaded connecting rod is threaded, and the connecting plate is provided with several threaded holes; The bearing capacity lower beam fixing seat includes a U-shaped connecting frame with an opening downward and a second threaded connecting rod installed through the lower end of the U-shaped connecting frame; a threaded connection hole is provided on the side of the U-shaped connecting frame. 5. An adjustable beam stress distribution law tester according to claim 1, characterized in that: said worm lifting mechanism comprises a worm connected to the hand wheel, a worm wheel meshed with the worm, passing through the middle of the worm wheel And the leading screw that is engaged with the worm gear and the pressure head that is connected at the bottom of the leading screw. 6. A kind of adjustable beam stress distribution tester according to claim 4, characterized in that: the positioning scale is movably connected to one end of the threaded stress rod, and the positioning scale is provided with a Waist hole for ruler. 7 . The adjustable beam stress distribution law tester according to claim 5 , wherein a pressure sensor is provided on the indenter. 8 . 8 . The adjustable beam stress distribution law tester according to claim 1 , wherein the hand wheel includes a wheel rib, a rim and a handle.