CN204405447U - A kind of crooked test teaching mode - Google Patents

Abstract

The utility model belongs to the technical field of mechanical equipment for teaching, and in particular relates to a bending test teaching model, which includes a support assembly for installing experimental materials. The support assembly is provided with a display device. scale beam. The utility model has the advantages of simple structure and intuitive display.

Description

A Bending Test Teaching Model

technical field

The utility model belongs to the technical field of mechanical equipment for teaching, in particular to a bending test teaching model.

Background technique

At present, in middle and higher schools, in order to help students deeply understand the theoretical knowledge of mechanics learned and cultivate students' hands-on ability, it is necessary to observe the changes in the bending state of mechanical materials after being stressed. However, most of the existing experimental analysis instruments are used for high-precision measurement. Most of these equipment are expensive and have a large volume and weight. It is impossible for ordinary users to intuitively display the process of material force change analysis for simple manual operations.

Chinese utility model patent CN203165295U discloses a material mechanics multi-functional combination test bench, as shown in Figure 2, including a rectangular frame 1, a load-bearing platform 2 is arranged on the upper end of the rectangular frame 1, and a bracket 3 is installed on the load-bearing platform 2 , the top of the bracket 3 is equipped with an experimental beam 4, a pair of loading booms 6 are connected to the experimental beam 4, the loading boom 6 is connected to the weighing beam 7, the weighing beam 7 is connected to the loading lifting mechanism 8, and the loading lifting mechanism 8 is connected to the loading Handwheel 9, the axle of loading handwheel 9 is fixed on the middle beam 10 of rectangular frame. This test bench can carry out many experiments of material mechanics textbooks, but there are the following problems: First, it adopts loading handwheel, loading lifting mechanism, weighing beam and loading boom as the loading device, and the structure is complex, so that the whole test bench The weight is increased; the second is that when the load is applied to the experimental beam by turning the loading handwheel, the magnitude of the loading force cannot be displayed intuitively, so students cannot form an intuitive impression of the relationship between the force and deformation of the experimental beam, and the visual display effect is poor , or an additional loading force display device needs to be added, thereby increasing the size and cost of the entire test bench.

Contents of the invention

The purpose of the utility model is to solve the above technical problems and provide a bending test teaching model with simple structure and intuitive display.

The technical scheme of the utility model is: a bending test teaching model, including a support assembly for installing experimental materials, a display device is provided on the support assembly, and a scale beam for installing weights is connected to the experimental materials.

The beam is connected with the experimental material. During the experiment, different weights are placed on the beam, and the weight exerts a certain pressure on the experimental material through the beam, so that the experimental material is bent and deformed. During the experiment, students can continuously place weights of different weights on the beam, and the operation can be interrupted or continued at any time, which is convenient to use and easy to record; at the same time, the experimental materials will have different bending deformation due to the force of different weights , the deformation of the experimental material can be visually displayed through the display device, which is convenient for observation. Through the weight and the display device, students can directly observe the different bending deformations of the experimental materials under different forces during the experiment. There is no need to set up a separate loading force display mechanism, and the structure is simple and the display is intuitive.

Preferably, the number of the beam is one, and the beam is connected to the middle of the experimental material. Three-point bending test for materials.

Preferably, the number of the beams is two, and the two beams are symmetrically arranged around the center line of the experimental material. Four-point bending test for materials.

Preferably, the beam is in an "L" shape, the horizontal part of the beam is overlapped with the experimental material, and the end of the vertical part of the beam is provided with a weight seat.

Furthermore, the display device is a dial indicator, and the dial indicator is fixed on the support assembly through a dial indicator bracket. The dial indicator can accurately display the data change status of the experimental material in the radial direction, the connection structure is simple and the performance is reliable.

Preferably, the support assembly includes a bracket body, a mobile mounting seat is provided above the bracket body, and a support seat is provided at the top of the mobile mounting seat.

Furthermore, the bracket body includes a left support plate and a right support plate, the lower part of the left support plate is connected to the lower part of the right support plate through the lower connecting beam, and the upper part of the left supporting plate is connected to the upper part of the right supporting plate through the upper connecting beam .

The beneficial effects of the utility model are: by using the weight marked with the weight as the power source to exert pressure on the material, the structure is simple and compact, easy to operate and record; at the same time, the high-precision dial gauge is used to display, measure and record the bending deformation value of the material , the experiment is accurate and reliable. In addition, the bending test teaching model of the utility model also has the advantages of small volume, light weight, compact structure, and easy operation during the experiment process.

Description of drawings

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

Fig. 2 is a schematic structural diagram of the prior art.

In the figure, 1. Bracket body, 11. Left supporting plate, 12. Right supporting plate, 13. Lower connecting beam, 14. Upper connecting beam, 2. Mobile mounting seat, 3. Supporting seat, 4. Dial indicator support, 5. Scale beam, 6. Experimental material, 7. Dial indicator, 8. Weight, 9. Weight seat.

Detailed ways

The technical solution of the utility model is described in detail below in conjunction with the accompanying drawings.

As shown in FIG. 1 , a bending test teaching model of the present invention includes a supporting component that plays a supporting role. Specifically, the support assembly includes a bracket body 1, the bracket body includes a left support plate 11 and a right support plate 12 on both sides, the bottom of the left support plate 11 is connected with the bottom of the right support plate 12 through a lower connecting beam 13, and the left support plate The top of 11 is connected with the top of right support plate 12 by upper connecting beam 14 . The upper connecting beam 14 is provided with a movable mounting base 2, which can be fixed at different positions of the upper connecting beam to perform bending tests on experimental materials of different lengths. The top of the mobile mounting base 2 is provided with a supporting base 3, and the experimental material 6 is placed on the supporting base 3 during the experiment.

The dial indicator 7 is fixed on the upper connecting beam through the dial indicator bracket 4, and the measuring head of the dial indicator 7 is in contact with the experimental material 6 to display the bending deformation of the experimental material. Of course, it is also possible to set a resistance strain gauge on the experimental material 6, and use the resistance strain gauge to display the bending deformation of the experimental material.

A beam 5 for installing a weight 8 is connected to the experimental material 6, and the beam 5 is designed in an "L" shape to facilitate overlapping with the experimental material. Specifically, the horizontal part of the scale beam is overlapped on the test material, and the end of the vertical part of the scale beam is provided with a weight base 9. By applying weights of different weights on the weight base, different pressures are applied to the test material. It makes the experimental materials undergo different bending deformations, the operation is simple and convenient to record, and the display is intuitive. In addition, a corresponding number of beams can be set according to the experimental requirements. For example, when performing a material three-point bending test, set a beam 5 and connect the beam to the middle of the experimental material 6; when performing a material four-point bending test, set two beams. The balance beam 5 and the balance beam are symmetrically arranged on the experimental material 6 along the center line, so as to meet the requirements of the applied load in the experiment.

In order to visually display the change state of the bending deformation of the experimental material due to the force, you can also use a spring scale with a hook, hook the experimental material at one end, and pull the other end to apply pressure by hand, you can see the reading of the spring scale The bending deformation of the experimental material also changes.

During the experiment, first place experimental materials such as aluminum alloy, brass, and nylon plate on the support base, adjust the dial indicator to zero; then connect the scale beam to the experimental material, and fix the dial indicator on the bracket body; then, Place weights of different weights on the beam, observe the bending deformation of the experimental material, and record the weight of the weights and the readings of the dial indicator, so as to have a deep understanding of the state of bending deformation changes caused by the force on the material.

Although the specific implementations of the present utility model have been described above, those skilled in the art should understand that these are only examples, and the protection scope of the present utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the present utility model, but these changes and modifications all fall within the protection scope of the present utility model.

Claims (7)

1. a crooked test teaching mode, comprising the supporting component for installing experiment material, it is characterized in that: described supporting component is provided with display device, and experiment material is connected with the arm beam of steelyard for installing counterweight.

2. a kind of crooked test teaching mode as claimed in claim 1, is characterized in that: the quantity of the described arm beam of steelyard is one, and the arm beam of steelyard is connected with the centre position of experiment material.

3. a kind of crooked test teaching mode as claimed in claim 1, is characterized in that: the quantity of the described arm beam of steelyard is two, and two arm beams of steelyard are arranged symmetrically with centered by the center line of experiment material.

4. a kind of crooked test teaching mode as described in as arbitrary in claims 1 to 3, is characterized in that: the described arm beam of steelyard is in " L " type, and the lateral part of the arm beam of steelyard and experiment material overlaps, and the arm beam of steelyard vertically end is partly provided with counterweight seat.

5. a kind of crooked test teaching mode as claimed in claim 4, is characterized in that: described display device is dial gauge, and dial gauge is fixed on supporting component by dial indicator bracket.

6. a kind of crooked test teaching mode as claimed in claim 1, is characterized in that: described supporting component comprises rack body, and the top of rack body is provided with mobile mount pad, and the top of mobile mount pad is provided with supporting seat.

7. a kind of crooked test teaching mode as claimed in claim 6, it is characterized in that: described rack body comprises left support plate and right support plate, the bottom of left support plate is connected with the bottom of right support plate by lower tie-beam, and the top of left support plate is connected with the top of right support plate by upper tie-beam.