CN209843006U

CN209843006U - Circular shaft internal force teaching model

Info

Publication number: CN209843006U
Application number: CN201920181361.9U
Authority: CN
Inventors: 陈海霞; 肖青战
Original assignee: Shaanxi Polytechnic Institute
Current assignee: Shaanxi Polytechnic Institute
Priority date: 2019-02-01
Filing date: 2019-02-01
Publication date: 2019-12-24
Anticipated expiration: 2029-02-01

Abstract

The utility model provides a circle axle internal force teaching mode, including column pole, vertical board, two right-hand type pieces. The longitudinal plate is perpendicular to the length direction of the columnar rod, a hole is formed in the longitudinal plate, the columnar rod can just penetrate through the hole, when an external force couple acts on the columnar rod and enables the columnar rod to rotate anticlockwise and clockwise when viewed from the normal line of the longitudinal plate to the longitudinal plate, the side face of the curved surface at any end of the columnar rod is held by four fingers of the right-hand-shaped sheet, the torque of the thumb pointing to the direction deviating from the longitudinal plate is positive, and the torque of the thumb pointing to the longitudinal plate is negative. The utility model has the advantages of simple structure, easy operation, small volume, light weight, low cost and the like, is easy for students to understand, and can be used for teaching and scientific knowledge demonstration of civil engineering and material mechanics major.

Description

Circular shaft internal force teaching model

[ technical field ] A method for producing a semiconductor device

The invention relates to the field of teaching aids, in particular to a teaching and scientific knowledge demonstration model for civil engineering and material mechanics major, and specifically relates to a circular shaft internal force teaching model.

[ background of the invention ]

Many colleges and universities will develop mechanics courses of "architectural mechanics" and "civil engineering mechanics" for building construction technology, road and bridge engineering, rail transit technology and other specialties in the second-level discipline of civil engineering. In these courses, when a student grasps the internal force of the circular shaft, i.e., calculates the internal force of the circular shaft, the positive and negative rules of the internal force of the circular shaft are not well understood, which affects the correctness of the result. However, in the teaching process, the principle and the shaft rotation effect can only be displayed by utilizing a simple right-hand spiral rule and a schematic diagram, a slide show, a graph and the like of the principle, but the positive and negative regulations of the internal force of the circular shaft of the external couple acting on the cross section cannot be displayed comprehensively, students do not have the opportunity and time to practice, operate, think and understand, and the teaching effect is not ideal. At present, a demonstration teaching aid model which can show and practice positive and negative judgment of internal force of a circular shaft at the cross section of a judgment shaft, and is simple in structure, convenient to operate and low in price is lacked.

Chinese utility model patent CN102353489A discloses a method for testing bidirectional torque of eddy current dynamometer "

The change of the number of the weights is utilized to enable different positive and negative voltage values generated by the tension and the pressure of the tension and pressure sensor to be calibrated to the stress of the tension and pressure sensor with the variable sheet type structure through A/D conversion to generate bidirectional torque, a computer reads a torque signal, the steering of a prime motor is judged through the positive and negative of the torque voltage, and the corresponding positive and negative torque values are calculated by calling the zero point and the full scale of the positive and negative torque voltage and combining the positive and negative voltage. Although the structure can obtain positive and negative values of the torque, the structure is complex, the operation is not easy, the cost is high, the calculation process is complicated, and the structure is not suitable for teaching and scientific knowledge demonstration processes. Chinese utility model patent CN108490376A discloses "a rotatory electro-magnet torque test frock and operation method thereof", this frock includes base, bottom plate and carrier board, installs two guide pillars on the bottom plate, and the carrier board that can reciprocate is installed to the guide pillar upper end, installs positive negative pole copper billet on the carrier board, half surrounds the locating piece. The tested product passes through the thrust of rising the cylinder, and its pivot inserts in the moment of torsion test post, and the motor drives the pivot and removes, and torque sensor carries out the torsion test to the product to select unqualified product through the computer. This utility model discloses carrying out the torsion test to the product, its structure is complicated, difficult operation, and the cost is higher, is not suitable for teaching and scientific knowledge demonstration process, and in addition, above patent also can not demonstrate the positive negative judgement of circle axle internal force of circle axle cross-section department directly perceived portably.

[ Utility model ] content

To prior art still lack about the positive and negative judgement of circle axle internal force to student's development to easily understand and simple structure, low price, the teaching demonstration model of easy operation, the utility model provides a circle axle internal force teaching model has the advantage that the expense is low, small, demonstration is convenient, simple structure, easy student understand the positive and negative judgement method of circle axle internal force. The utility model discloses a concrete technical scheme as follows:

a circular shaft internal force teaching model comprises a columnar rod, a longitudinal plate and a right-hand template; the right-hand slice has flexibility; the longitudinal plate is provided with a hole, and the size of the hole is just right for the columnar rod to pass through; the right-hand sheet is fixed on the curved side surface of the columnar rod, wherein the curved side surface of the columnar rod is held by four fingers, and the thumb points to the length direction of the columnar rod.

Furthermore, the number of the columnar rods is two, and an external thread is arranged at one end of each columnar rod; internal threads are arranged in the holes on the longitudinal plates; the internal thread can simultaneously cooperate with both external threads.

Further, the longitudinal plate can be split into two concave plates; at least one sub concave plate with the size and the shape matched with the concave plate is arranged in the concave plate, and the sub concave plate can be taken out or put back.

Further, the device also comprises a central shaft; the columnar rod is hollow, and two end faces of the columnar rod are provided with round holes matched with the central shaft; the central shaft penetrates through the round hole and is arranged in the columnar rod, and the length of the central shaft is greater than that of the columnar rod; the central shaft can rotate in the cylindrical rod; a groove is formed in the side face of the curved surface of the columnar rod; the right-hand profile is connected with the central shaft and can extend out of the groove through the notch; and a fixing object capable of being fixed with the columnar rod is arranged on the finger of the right-hand section bar.

The utility model discloses following beneficial effect has: the utility model has the advantages of simple structure, convenient operation, low price not only can clearly demonstrate the positive and negative process of judging of circle axle internal force of circle axle cross-section department, is convenient for moreover the student and moves the operation exercise, changes in the student and understands and master the knowledge of studying.

[ description of the drawings ]

FIG. 1 is a schematic structural view showing that the torque of embodiment 1 of the present invention is positive

FIG. 2 is a schematic view of the structure of embodiment 1 of the present invention with negative torque

FIG. 3 is a schematic view of the structure of the threaded rod and the longitudinal plate of embodiment 2 of the present invention

Fig. 4 is a schematic structural view of embodiment 2 of the present invention with positive torque

Fig. 5 is a schematic structural view showing that the torque of embodiment 2 of the present invention is negative

Fig. 6 is a schematic structural view of the detachable longitudinal plate and the sub-concave plate according to embodiment 3 of the present invention

Fig. 7 is a side view of embodiment 3 of the present invention

FIG. 8 is a plan view of embodiment 3 of the present invention

Fig. 9 is a side elevation sectional view of embodiment 3 of the present invention

Fig. 10 is a schematic structural view of embodiment 3 of the present invention showing a positive torque on the detachable longitudinal plate 6

Fig. 11 is a schematic structural view of the detachable longitudinal plate 6 of embodiment 3 of the present invention with negative torque

Fig. 12 is a schematic structural view of embodiment 3 of the present invention showing a positive torque on two sub-concave plates 7

Fig. 13 is a schematic structural view of the two sub-concave plates 7 according to embodiment 3 of the present invention with negative torque

Illustration of the drawings: 1-a cylindrical rod; 2-longitudinal plates; 3-hole, 4-right hand type piece, 5-threaded columnar rod, 6-detachable longitudinal plate, 7-sub concave plate, 8-central shaft, 9-groove, 10-telescopic right hand type piece and 11-fixture (the fixture is preferably magic tape).

[ detailed description ] embodiments

The present invention will be further described with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.

Example 1: referring to fig. 1-2, a teaching model of internal force of a circular shaft comprises a columnar rod 1, a longitudinal plate 2, a hole 3 and 2 right-hand type pieces 4.

Wherein the cylindrical rod 1 represents a circular shaft and the longitudinal plate 2 represents a cross section within the circular shaft. The longitudinal plates 2 are provided with holes 3, and the columnar rods 1 just pass through the holes 3.

The using method comprises the following steps: when the columnar rod 1 is manually rotated along the counterclockwise direction seen from the normal line of the longitudinal plate 2 to the longitudinal plate, a right-hand sheet 4 is adhered to the curved side surface of the left half side of the columnar rod 1 by glue, wherein four fingers are held along the rotating direction of the columnar rod 1, a thumb is adhered to the columnar rod 1 along the length direction of the columnar rod, and at the moment, the thumb points to the direction departing from the longitudinal plate 2, so that the external couple torque on the cross section is positive. Similarly, when the columnar bar 1 is manually rotated clockwise when viewed from the normal line of the longitudinal plate 2 to the longitudinal plate, the other right-hand sheet 4 is adhered to the curved side surface of the right half side of the columnar bar 1 by glue, wherein the four fingers are held along the rotating direction of the columnar bar 1, the thumb is adhered to the columnar bar 1 along the length direction of the columnar bar, and at the moment, the thumb points to the longitudinal plate 2, so that the external couple torque on the cross section is negative.

Example 2: referring to fig. 3-5, a circular shaft internal force teaching model comprises 2 threaded cylindrical rods 5, a longitudinal plate 2, a hole 3, and 2 right-hand blades 4.

Wherein the cylindrical rod 5 represents a circular axis and the longitudinal plate 2 represents a cross section within the circular axis. The longitudinal plate 2 is provided with a hole 3, and the two columnar rods 5 are respectively connected with the internal thread in the hole 3 through rotating external threads from the two sides of the longitudinal plate 2.

Example 3: referring to fig. 6-13, a teaching model of internal force of a circular shaft comprises a column-shaped rod 1, a detachable longitudinal plate 6, a sub-concave plate 7, a central shaft 8, 2 holes 3, 4 grooves 9, 4 telescopic right-hand-shaped sheets 10 and a magic tape 11.

Wherein the cylindrical rod 1 represents a circular shaft and the detachable longitudinal plate 6 represents a cross section within the circular shaft. The detachable longitudinal plate 6 consists of two detachable concave plates, the two concave plates are respectively provided with a sub concave plate 7 with the size and the shape matched with the size and the shape, the two concave plates of the detachable longitudinal plate 6 are respectively connected with the left section of the columnar rod 1, the two sub concave plates 7 are connected with the right section of the columnar rod, and the columnar rod 1 just passes through the two holes 3. The columnar rod 1 is hollow, round holes are formed in two end faces of the columnar rod 1, the central shaft 8 penetrates through the round holes to be located in the columnar rod 1, and two end heads of the central shaft 8 are located on the left round bottom face and the right round bottom face of the columnar rod 1. The central shaft 8 can rotate in the columnar rod 1, and when two ends of the central shaft 8 are rotated, the columnar rod 1 rotates along with the central shaft 8. The central shaft 8 is connected with 4 telescopic right-hand profiles 10 at different positions respectively. There are four grooves 9 on the curved surface side of column pole 1, and scalable right hand type piece 10 can be pulled out from groove 9 to it is fixed with column pole 1 through magic subsides 11 on the finger. When the telescopic right-hand matrix 10 needs to be retracted into the groove, the central shaft 8 can be rotated.

The using method comprises the following steps: a telescopic right-hand type piece 10 is pulled out of a groove 9, in the pulling-out process, a central shaft 8 drives a columnar rod 1 to rotate anticlockwise when viewed from the normal line of the detachable longitudinal plate 6 to the longitudinal plate, at the moment, a magic tape 11 on the telescopic right-hand type piece 10 is pasted on the curved side face of the columnar rod 1, four fingers are held in the rotating direction of the columnar rod 1, a thumb is pasted on the columnar rod along the length direction of the columnar rod 1, at the moment, the thumb points to the direction deviating from the detachable longitudinal plate 6, and the external force couple torque on the cross section is positive. Rotating the central shaft 8, fixing the first telescopic right-hand sheet to the central shaft 8, pulling out the second telescopic right-hand sheet 10 from the groove 9, wherein in the pulling-out process, the central shaft 8 drives the columnar rod 1 to rotate clockwise when viewed from the normal line of the detachable longitudinal plate 6 to the longitudinal plate, at the moment, the magic tape 11 on the telescopic right-hand sheet 10 is pasted on the curved side surface of the columnar rod 1, wherein four fingers are held along the rotating direction of the columnar rod 1, and a thumb is pasted on the columnar rod along the length direction of the columnar rod 1, at the moment, the thumb points to the direction of the detachable longitudinal plate 6, and the external couple torque on the cross section is negative. Rotation center axle 8, fix the scalable right hand type piece of second on center axle 8, pull out third scalable right hand type piece 10 from groove 9, at the in-process of pulling out, center axle 8 drives the column pole 1 and follows the anticlockwise rotation of the line of normal of the vertical board of two sub-concave plate 7 constitutions to vertical board, at this moment, paste magic subsides 11 on scalable right hand type piece 10 on the curved surface side of column pole 1, wherein four fingers are held along the direction of rotation of column pole 1, the thumb pastes on the column pole along 1 length direction of column pole, at this moment, the directional direction that deviates from this vertical board of thumb, the external force couple moment of torsion that this cross section department received is positive. The center shaft 8 rotates, fix the third scalable right hand type piece to the center shaft 8 on, pull out fourth scalable right hand type piece 10 from groove 9 in, at the in-process that pulls out, center shaft 8 drives column pole 1 and rotates to the clockwise direction that vertical board was seen along the normal line of the vertical board that two sub-concave plates 7 are constituteed, at this moment, paste magic subsides 11 on scalable right hand type piece 10 on the curved surface side of column pole 1, wherein four fingers are held along the direction of rotation of column pole 1, the thumb pastes on column pole along 1 length direction of column pole, at this moment, the thumb points to the direction of this vertical board, the external force couple moment of torsion that this cross section department received is the burden.

In the model, a plurality of longitudinal plates can be arranged for displaying the torque stress conditions on the cross sections of a plurality of circular shafts. The longitudinal plate can be a PVC plastic plate, but is not limited to the materials. The columnar rod can be made of light materials, such as easily-processed EPE pearl cotton, foam cotton and the like.

The invention has simple structure, convenient processing, small volume, light weight and low price, can visually reflect the stress phenomenon on the cross section of the circular shaft, reflects the positive and negative judgment of the internal force of the circular shaft at the cross section of the circular shaft, is very favorable for students with insufficient imagination to learn abstract concepts, and achieves ideal teaching effect.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be considered as the protection scope of the present invention.

Claims

1. The utility model provides a circular shaft internal force teaching mode which characterized in that: comprises a columnar rod, a longitudinal plate and a right-hand template; the right-hand slice has flexibility; the longitudinal plate is provided with a hole, and the size of the hole is just right for the columnar rod to pass through; the right-hand sheet is fixed on the curved side surface of the columnar rod, wherein the curved side surface of the columnar rod is held by four fingers, and the thumb points to the length direction of the columnar rod.

2. The circular shaft internal force teaching model of claim 1, wherein: the number of the columnar rods is two, and one end of each columnar rod is provided with an external thread; internal threads are arranged in the holes on the longitudinal plates; the internal thread can simultaneously cooperate with both external threads.

3. The circular shaft internal force teaching model of claim 1, wherein: the longitudinal plate can be split into two concave plates; at least one sub concave plate with the size and the shape matched with the concave plate is arranged in the concave plate, and the sub concave plate can be taken out or put back.

4. The circular shaft internal force teaching model of claim 1, wherein: also comprises a central shaft; the columnar rod is hollow, and two end faces of the columnar rod are provided with round holes matched with the central shaft; the central shaft penetrates through the round hole and is arranged in the columnar rod, and the length of the central shaft is greater than that of the columnar rod; the central shaft can rotate in the cylindrical rod; a groove is formed in the side face of the curved surface of the columnar rod; the right-hand profile is connected with the central shaft and can extend out of the groove through the notch; and a fixing object capable of being fixed with the columnar rod is arranged on the finger of the right-hand section bar.