CN217386552U

CN217386552U - Portable pressure bar stabilization experiment teaching aid

Info

Publication number: CN217386552U
Application number: CN202220308539.3U
Authority: CN
Inventors: 胡亚东
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-02-14
Filing date: 2022-02-14
Publication date: 2022-09-06
Anticipated expiration: 2032-02-14

Abstract

The utility model relates to the field of experiment teaching equipment, in particular to a portable pressure bar stabilization experiment teaching aid, which comprises a base; a top plate is arranged above the base, and two supporting side plates are connected between the top plate and the base; mounting holes are formed in the two supporting side plates, and fixed pulleys are arranged on the inner sides of the two mounting holes; a moving plate is arranged below the top plate, and a linear driving mechanism for driving the moving plate to ascend and descend is arranged on the top plate; the lower part of the moving plate is connected with an installation plate, a pressure sensor is arranged between the installation plate and the moving plate, a three-jaw chuck B is arranged on the lower end surface of the installation plate, and a three-jaw chuck A is arranged on the base; a circular ring is arranged between the three-jaw chuck A and the three-jaw chuck B; two groups of connecting components are symmetrically arranged on the circular ring, and each group of connecting components comprises a connecting wire and a balance weight; the balance weight is provided with a displacement sensor. The utility model discloses can fix the test piece of equidimension not, strong adaptability to the deformation degree that can also quantify the test piece.

Description

Portable pressure bar stabilization experiment teaching aid

Technical Field

The utility model relates to an experiment teaching equipment field especially relates to a portable depression bar stable experiment teaching aid.

Background

When the pressure reaches a certain value, the slender pressure rod may be suddenly bent and damaged, i.e. a destabilization phenomenon is generated. The stability of the compression bar means the stability of the equilibrium state of the compression bar. When the pressure P is less than a certain value, the equilibrium of the straight line state is stable, and when P is greater than the value, the equilibrium is unstable, and the limit value P is called a critical force. When the plunger is in an unstable equilibrium state, it is said to lose stability or simply destabilize. Obviously, the compression bars in the load bearing structure must not be allowed to collapse. Because the support of the rod end plays a role in restraining the deformation of the rod, and different support forms have different restraining effects on the deformation of the rod piece, the critical force values which can be applied to the same compression rod are necessarily different when the support conditions of the two ends of the same compression rod are different. The engineering generally reflects the factor of the stability of the compression bar by using the 'calculated length' according to the support condition of the bar. The compression bars made of different materials have different reduction coefficients of bearing capacity and different names under different supporting conditions, the steel compression bars are called slenderness ratios, the reinforced concrete columns are called height-to-width ratios, and masonry walls and columns are called height-to-thickness ratios, but the stability of the compression bars is considered.

In the mechanics of materials teaching, there is the depression bar stability test experiment to the steel depression bar specially, in the experimentation, slowly exert pressure to the steel depression bar along the axis, pressure when the balance of pressurized test piece loses the stability is just critical pressure, need be with the help of special depression bar stability test appearance in the experimentation, the steel depression bar test piece that pastes the resistance strain gauge, and must carry out the collection and the demonstration of data acquisition with the help of data acquisition instrument and computer, but also there is the structure complicacy, the preparation degree of difficulty is big, with high costs, it is bulky, it is difficult to remove, it is troublesome etc. not enough to change the sample.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the technical problem who exists among the background art, the utility model provides a portable depression bar stable experiment teaching aid.

The technical scheme of the utility model: a portable pressure bar stabilization experiment teaching aid comprises a base; a top plate is arranged above the base, and two supporting side plates are fixedly connected between the top plate and the base; mounting holes are formed in the two supporting side plates, fixed pulleys are arranged on the inner sides of the two mounting holes, mounting shafts are arranged on the fixed pulleys, and the fixed pulleys are rotatably connected with the supporting side plates through the mounting shafts; a moving plate is arranged below the top plate, and a linear driving mechanism for driving the moving plate to ascend and descend is arranged on the top plate; the lower part of the moving plate is connected with an installation plate, a pressure sensor is arranged between the installation plate and the moving plate, a three-jaw chuck B is arranged on the lower end surface of the installation plate, a three-jaw chuck A is arranged on the upper end surface of the base, and the three-jaw chuck A is positioned right below the three-jaw chuck B; a circular ring is arranged between the three-jaw chuck A and the three-jaw chuck B, and two groups of clamping assemblies are arranged on the circular ring; two groups of connecting components are symmetrically arranged on the circular ring, each group of connecting components comprises a connecting wire and a balance weight, two ends of the connecting wire are respectively connected with the circular ring and the balance weight, and the connecting wire is wound on the fixed pulley on one corresponding side; a displacement sensor is arranged on the balance weight; the base is provided with a controller.

Preferably, each group of clamping assemblies comprises an arc limiting plate, a pulling block, a connecting rod and a spring, the pulling block is arranged on the outer side of the ring, the arc limiting plate is connected with the pulling block through the connecting rod, the connecting rod movably penetrates through the side wall of the ring, and the spring is sleeved on the connecting rod.

Preferably, a plurality of guide rods are vertically connected to the mounting plate, and the top ends of the guide rods penetrate through the movable plate and are connected with limiting blocks.

Preferably, the controller comprises a processor, a display screen and control keys; the controller is electrically connected with the linear driving mechanism, the pressure sensor and the displacement sensor.

Preferably, a plurality of self-locking universal wheels are installed at the bottom end of the base.

Preferably, the linear driving mechanism is any one of a pneumatic cylinder, a hydraulic cylinder or an electric push rod.

Compared with the prior art, the above technical scheme of the utility model following profitable technological effect has: the utility model has simple operation and low experiment cost, can conveniently complete the experiment task, and changes the value detected by the displacement sensor when the test piece is bent through the arranged circular ring, the connecting component, the balance weight, the displacement sensor and the controller, thereby quantifying the deformation degree of the test piece; the three-jaw chuck A and the three-jaw chuck B can be used for fixing different types of test pieces, and the adaptability is strong.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural view of the connection relationship between the middle ring and the clamping assembly of the present invention.

Reference numerals are as follows: 1. a base; 2. supporting the side plates; 201. mounting holes; 31. a three-jaw chuck A; 32. a three-jaw chuck B; 4. a top plate; 5. a linear drive mechanism; 6. moving the plate; 7. mounting a plate; 8. a guide bar; 9. a limiting block; 10. a pressure sensor; 11. a circular ring; 12. a fixed pulley; 121. installing a shaft; 13. a connecting wire; 14. balancing weight; 15. a displacement sensor; 16. a controller; 17. self-locking universal wheels; 18. an arc limiting plate; 19. pulling the block; 20. a connecting rod; 21. a spring.

Detailed Description

Example one

As shown in fig. 1-2, the utility model provides a portable pressure bar stabilization experiment teaching aid, which comprises a base 1; a plurality of self-locking universal wheels 17 are mounted at the bottom end of the base 1, and the device can be moved conveniently through the self-locking universal wheels 17; a top plate 4 is arranged above the base 1, and two supporting side plates 2 are fixedly connected between the top plate 4 and the base 1; mounting holes 201 are formed in the two supporting side plates 2, fixed pulleys 12 are arranged on the inner sides of the two mounting holes 201, mounting shafts 121 are arranged on the fixed pulleys 12, and the fixed pulleys 12 are rotatably connected with the supporting side plates 2 through the mounting shafts 121; a moving plate 6 is arranged below the top plate 4, a linear driving mechanism 5 for driving the moving plate 6 to ascend and descend is arranged on the top plate 4, and the linear driving mechanism 5 is any driving piece of an air cylinder, a hydraulic cylinder or an electric push rod; an installation plate 7 is connected below the moving plate 6, a plurality of guide rods 8 are vertically connected to the installation plate 7, and the top ends of the guide rods 8 movably penetrate through the moving plate 6 and are connected with limit blocks 9; a pressure sensor 10 is arranged between the mounting plate 7 and the moving plate 6, a three-jaw chuck B32 is arranged on the lower end face of the mounting plate 7, a three-jaw chuck A31 is arranged on the upper end face of the base 1, and the three-jaw chuck A31 is positioned right below the three-jaw chuck B32; a circular ring 11 is arranged between the three-jaw chuck A31 and the three-jaw chuck B32, and two groups of clamping components are arranged on the circular ring 11; two groups of connecting components are symmetrically arranged on the circular ring 11, each group of connecting components comprises a connecting wire 13 and a counterweight 14, two ends of the connecting wire 13 are respectively connected with the circular ring 11 and the counterweight 14, and the connecting wire 13 is wound on the fixed pulley 12 on one corresponding side; a displacement sensor 15 is arranged on the counterweight 14; the base 1 is provided with a controller 16; the controller 16 comprises a processor, a display screen and control keys; the controller 16 is electrically connected with the linear driving mechanism 5, the pressure sensor 10 and the displacement sensor 15.

Example two

As shown in fig. 2, the utility model provides a teaching aid is stabilized to portable depression bar compares in embodiment one, and every a set of centre gripping subassembly all includes arc limiting plate 18 in this embodiment, draws piece 19, connecting rod 20 and spring 21, draws piece 19 to arrange the outside of ring 11 in, arc limiting plate 18 with draw and be connected through connecting rod 20 between the piece 19, and the connecting rod 20 activity runs through the lateral wall of ring 11, and the spring 21 cover is established on connecting rod 20.

The utility model discloses a theory of operation and application method as follows: before testing, the arc limiting plates 18 on the two sides are pulled open, the test piece penetrates through the center of the circular ring 11, the bottom end of the test piece is arranged on the inner side of the three-jaw chuck A31, then the arc limiting plates 18 are loosened, the test piece is clamped between the two arc limiting plates 18 under the action of the elastic force of the spring 21, then the three-jaw chuck A31 is adjusted to clamp the bottom end of the test piece, then the linear driving mechanism 5 is started to work to drive the moving plate 6 to move downwards, the moving plate 6 drives the mounting plate 7 and the three-jaw chuck B32 to move until the top end of the test piece is contacted with the mounting plate 7, the top end of the test piece is clamped through the arranged three-jaw chuck B32, then the linear driving mechanism 5 is started again to work, the linear driving mechanism 5 applies pressure to the test piece, when the test piece is bent and deformed, the circular ring 11 is driven to move, the balance weight can move in the vertical direction under the matching action of the connecting wire 13 and the fixed pulley 12, the displacement sensor 15 that sets up can detect the displacement distance of counter weight 14, and displacement sensor 15 feeds back the signal to controller 16 to through the display screen display that sets up the data that record, thereby can quantify the deformation degree of test piece.

The embodiments of the present invention have been described in detail with reference to the drawings, but the present invention is not limited thereto, and various changes can be made without departing from the gist of the present invention within the knowledge of those skilled in the art.

Claims

1. A portable pressure bar stabilization experiment teaching aid is characterized by comprising a base (1); a top plate (4) is arranged above the base (1), and two supporting side plates (2) are fixedly connected between the top plate (4) and the base (1); mounting holes (201) are formed in the two supporting side plates (2), fixed pulleys (12) are arranged on the inner sides of the two mounting holes (201), mounting shafts (121) are arranged on the fixed pulleys (12), and the fixed pulleys (12) are rotatably connected with the supporting side plates (2) through the mounting shafts (121); a moving plate (6) is arranged below the top plate (4), and a linear driving mechanism (5) for driving the moving plate (6) to lift is arranged on the top plate (4); the lower part of the moving plate (6) is connected with an installation plate (7), a pressure sensor (10) is arranged between the installation plate (7) and the moving plate (6), a three-jaw chuck B (32) is arranged on the lower end face of the installation plate (7), a three-jaw chuck A (31) is arranged on the upper end face of the base (1), and the three-jaw chuck A (31) is positioned under the three-jaw chuck B (32); a circular ring (11) is arranged between the three-jaw chuck A (31) and the three-jaw chuck B (32), and two groups of clamping components are arranged on the circular ring (11); two groups of connecting components are symmetrically arranged on the circular ring (11), each group of connecting components comprises a connecting wire (13) and a counterweight (14), two ends of the connecting wire (13) are respectively connected with the circular ring (11) and the counterweight (14), and the connecting wire (13) is wound on the fixed pulley (12) on one corresponding side; a displacement sensor (15) is arranged on the counterweight (14); the base (1) is provided with a controller (16).

2. The portable pressure bar stabilization experiment teaching aid of claim 1, wherein each group of clamping assemblies comprises an arc-shaped limiting plate (18), a pulling block (19), a connecting rod (20) and a spring (21), the pulling block (19) is arranged on the outer side of the circular ring (11), the arc-shaped limiting plate (18) and the pulling block (19) are connected through the connecting rod (20), the connecting rod (20) movably penetrates through the side wall of the circular ring (11), and the spring (21) is sleeved on the connecting rod (20).

3. The portable pressure bar stabilization experiment teaching aid according to claim 1, wherein a plurality of guide rods (8) are vertically connected to the mounting plate (7), and the top ends of the guide rods (8) movably penetrate through the moving plate (6) and are connected with limit blocks (9).

4. A portable compression bar stabilization experiment teaching aid as claimed in claim 1, wherein the controller (16) comprises a processor, a display screen and control keys; the controller (16) is electrically connected with the linear driving mechanism (5), the pressure sensor (10) and the displacement sensor (15).

5. A portable compression bar stabilization experiment teaching aid according to claim 1, characterized in that a plurality of self-locking universal wheels (17) are mounted at the bottom end of the base (1).

6. The portable pressure bar stabilization experiment teaching aid according to claim 1, wherein the linear driving mechanism (5) is any driving part of an air cylinder, a hydraulic cylinder or an electric push rod.