阅读说明：本技术 一种验证二力平衡条件的装置 (Device for verifying two-force balance condition ) 是由 毛佳琦 嵇明军 周剑波 韩学廷 于 2019-10-25 设计创作，主要内容包括：本发明涉及一种验证二力平衡条件的装置。所述验证二力平衡条件的装置包括展示板、力臂杆、铅锤组件、拉力组件与显示屏,所述展示板的顶部边缘设置有横向刻度部,所述展示板上还设置有弧形导轨部,所述力臂杆的一端转动地设置于所述展示板的顶角处,所述力臂杆的另一端朝所述弧形导轨部延伸,并滑动地设置于所述弧形导轨部上,所述铅锤组件包括重力块、拉绳与第一激光器,所述重力块通过所述拉绳连接于所述力臂杆的中部。所述验证二力平衡条件的装置直观且方便教学。(The invention relates to a device for verifying a two-force balance condition. Verify the device of two balanced conditions of two forces including show board, power armed lever, plummet subassembly, pulling force subassembly and display screen, the top edge of show board is provided with horizontal scale portion, still be provided with arc guide rail portion on the show board, the one end of power armed lever set up with rotating in the apex angle department of show board, the other end court of power armed lever arc guide rail portion extends to set up with sliding in arc guide rail portion is last, the plummet subassembly includes gravity piece, stay cord and first laser instrument, the gravity piece passes through the stay cord connect in the middle part of power armed lever. The device for verifying the two-force balance condition is visual and convenient for teaching.)

1. A device for verifying a two-force balance condition is characterized by comprising a display board, a force arm rod, a plumb bob component, a tension component and a display screen, wherein a transverse scale part is arranged at the edge of the top of the display board, an arc-shaped guide rail part is further arranged on the display board, one end of the force arm rod is rotatably arranged at the vertex angle of the display board, the other end of the force arm rod extends towards the arc-shaped guide rail part and is slidably arranged on the arc-shaped guide rail part, the plumb bob component comprises a gravity block, a pull rope and a first laser, the gravity block is connected to the middle part of the force arm rod through the pull rope, the tension component comprises a tension meter and a sensor, the tension meter is buckled at the end part of the force arm rod to vertically pull the force arm rod, the sensor is used for sensing the numerical value of the tension meter, and the display screen is arranged at the top of the display board, and for receiving a value indicative of the value sensed by the sensor.

2. The device for verifying the condition of two force balance as claimed in claim 1, wherein the top corner of said display board is located at the center of said arc-shaped guide rail portion, and said arc-shaped guide rail portion is concavely disposed on said display board.

3. The device for verifying the condition of two force balance as claimed in claim 2, wherein a first bearing is disposed at a top corner of the display board, the arm lever comprises a hinge end and a pull end disposed opposite to each other, the hinge end is rotatably disposed on the first bearing, the pull end is disposed with a second bearing, and the second bearing is disposed in the arc-shaped guide rail portion.

4. The device for verifying a condition of two force balance as claimed in claim 3, wherein said arc-shaped rail portion is a groove-shaped rail portion comprising a bottom groove and an upper groove communicating with each other, said upper groove penetrating the surface of said display board, said pulling end being provided with a pivot rod, said pivot rod being inserted into said upper groove.

5. The device for verifying a two-force balance condition of claim 4, wherein said second bearing is sleeved on said pivot rod and located in said bottom recess, and said tension meter is snap-fit to an end of said pivot rod away from said second bearing.

6. The device for verifying a condition of two force balance as claimed in claim 5, wherein said hinged end is provided with a redundant segment protruding outward in a direction away from said pulling end, a third bearing is provided at a middle position of a connecting line of said pulling end and said hinged end, a distance between a center of said third bearing and said pulling end is defined as a first distance, a distance between said third bearing and said hinged end is defined as a second distance, said second distance is equal to a sum of said first distance and a length of said redundant segment, and said pulling rope is connected to said third bearing.

7. The device for verifying a two-force balance condition of claim 6, wherein said first laser is mounted at an upper end of said bearing for maintaining an upward irradiation of said lateral scale portion to mark a lateral moment arm length of said gravity block.

8. The device for verifying a two-force equilibrium condition according to claim 7, wherein the side of the display board is further provided with a longitudinal scale, and the pulling end is further provided with a second laser for emitting laser light towards the longitudinal scale to indicate the length of the longitudinal arm of the pulling end.

9. An apparatus for verifying a condition of two force balance according to claim 8, wherein the lateral scale and the longitudinal scale are scales fixed to or ruled on the edge of the display board.

10. The device for verifying the condition of two force balance as claimed in claim 9, wherein the light emitting direction of the first laser or the second laser is inclined with respect to the display board and perpendicular to the horizontal scale portion or the vertical scale portion.

Technical Field

The invention relates to a device for verifying a two-force balance condition.

Background

In the teaching field, lines on textbooks are generally expressed and described in order to explain the problems of two-force balance and the like. For example by F₁L₁＝F₂L₂The product of force multiplied by force arm is moment, and the two moments are equal to each other, so that the two forces can reachAnd (4) balancing. However, such interpretation of lines through books is prone to poor clarity, unintuitive and inconvenient for teaching.

Disclosure of Invention

Based on this, there is a need for an intuitive and easy-to-teach device for verifying the balance condition of two forces.

A device for verifying the balance condition of two forces comprises a display board, a force arm rod, a plumb bob component, a tension component and a display screen, the top edge of the display board is provided with a transverse scale part, the display board is also provided with an arc-shaped guide rail part, one end of the arm-of-force lever is rotatably arranged at the top corner of the display board, the other end of the arm-of-force lever extends towards the arc-shaped guide rail part, and is slidably disposed on the arc-shaped guide rail part, the plumb bob assembly comprises a gravity block, a pull rope and a first laser, the gravity block is connected to the middle part of the arm-of-force rod through the pull rope, the tension assembly comprises a tension meter and a sensor, the tension meter is buckled at the end part of the arm-force rod to vertically pull the arm-force rod, the sensor is used for sensing the value of the tension meter, the display screen is arranged at the top of the display board and used for receiving and displaying the numerical value sensed by the sensor.

In one embodiment, the top corner of the display board is located at the center of the arc-shaped guide rail part, and the arc-shaped guide rail part is concavely arranged on the display board.

In one embodiment, a first bearing is disposed at a top corner of the display board, the arm-of-force lever includes a hinged end and a pulling end, the hinged end and the pulling end are oppositely disposed, the hinged end is rotatably disposed on the first bearing, the pulling end is disposed with a second bearing, and the second bearing is disposed in the arc-shaped guide rail portion.

In one embodiment, the arc-shaped guide rail portion is in a groove shape and includes a bottom groove and an upper groove which are communicated with each other, the upper groove penetrates through the surface of the display board, the pulling end is provided with a pivot rod, and the pivot rod is inserted into the upper groove.

In one embodiment, the second bearing is sleeved on the pivot rod and located in the bottom groove, and the tension meter is pulled and buckled at one end of the pivot rod away from the second bearing.

In one embodiment, the hinged end is provided with a redundant segment protruding outwards in a direction away from the pulling end, a third bearing is arranged in the middle of a connecting line between the pulling end and the hinged end, a distance between the center of the third bearing and the pulling end is defined as a first distance, a distance between the third bearing and the hinged end is defined as a second distance, the second distance is equal to the sum of the first distance and the length of the redundant segment, and the pulling rope is connected to the third bearing.

In one embodiment, the first laser is mounted at the upper end of the bearing for maintaining an upward illumination of the lateral scale to indicate a lateral moment arm length of the gravity block.

In one embodiment, the side of the display board is further provided with a longitudinal scale portion, and the pulling end is further provided with a second laser, wherein the second laser is used for emitting laser towards the longitudinal scale portion so as to mark the length of a longitudinal force arm of the pulling end.

In one embodiment, the transverse scale and the longitudinal scale are scales fixed on the edge of the display board or scale lines marked on the edge of the display board.

In one embodiment, the light emitting direction of the first laser or the second laser is inclined with respect to the display board and perpendicular to the horizontal scale portion or the longitudinal scale portion.

When the device for verifying the two-force balance condition is used, a teacher holds the tension meter by hand and then vertically pulls the arm lever to rotate, in the pulling process, the gravity of the gravity block is inconvenient, but the arm of force is continuously increased, so that the moment of the gravity block is continuously increased, and the tension meter is always vertical to the arm lever because the length of the arm of force is unchanged, so that the tension of the tension meter needs to be continuously increased in order to overcome the moment of the gravity block, and then the tension is displayed through the display screen. The student can understand the principle of two forces balance through the numerical value that the display screen shows, directly perceived and convenient teaching.

Drawings

FIG. 1 is a schematic perspective view of an apparatus for verifying a two-force balance condition according to an embodiment.

FIG. 2 is a perspective view of another perspective of the apparatus for verifying a two-force balance condition shown in FIG. 1.

Fig. 3 is a partially enlarged view of a portion a in fig. 1.

Detailed Description

To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The invention relates to a device for verifying a two-force balance condition. For example, the device for verifying the condition of two force balance comprises a display board, a force arm rod, a plumb bob component, a tension component and a display screen, wherein the top edge of the display board is provided with a transverse scale part. For example, still be provided with arc guide rail portion on the show board, the one end of power armed lever set up with rotating in the apex angle department of show board, the other end of power armed lever court arc guide rail portion extends to set up with sliding in on the arc guide rail portion, the plummet subassembly includes gravity piece, stay cord and first laser instrument. For example, the gravity block is connected to the middle of the arm lever through the pull rope, the tension assembly comprises a tension meter and a sensor, and the tension meter is buckled at the end of the arm lever to vertically pull the arm lever. For example, the sensor is used for sensing the value of the tension meter, and the display screen is arranged on the top of the display board and used for receiving and displaying the value sensed by the sensor.

Referring to fig. 1 and 2, a device for verifying a two-force balance condition includes a display board 10, a force arm 201, a plumb bob assembly 30, a pull assembly 40 and a display screen 50, wherein a transverse scale portion 12 is disposed at a top edge of the display board 10, an arc-shaped rail portion 11 is further disposed on the display board 10, one end of the force arm 201 is rotatably disposed at a vertex angle of the display board 10, the other end of the force arm 201 extends toward the arc-shaped rail portion 11 and is slidably disposed on the arc-shaped rail portion 11, the plumb bob assembly 20 includes a gravity block 21, a pull rope 22 and a first laser 23, the gravity block 21 is connected to a middle portion of the force arm 201 through the pull rope 22, the pull assembly 40 includes a pull meter 41 and a sensor, the pull meter 41 is fastened to an end portion of the force arm 201 to vertically pull the force arm 201, the sensor is configured to sense a value of the pull meter 41, the display screen 50 is disposed on the top of the display board 10 and is used for receiving and displaying the value sensed by the sensor.

When the device for verifying the two-force balance condition is used, a teacher holds the tension meter 41 by hand, and then vertically pulls the arm 201 to rotate, in the pulling process, the gravity of the gravity block 21 is inconvenient, but the moment arm is continuously increased, so that the moment of the gravity block is continuously increased, and because the length of the arm 201 is unchanged, and the tension meter 41 is always vertical to the arm 201, in order to overcome the moment of the gravity block 21, the tension of the tension meter 41 needs to be continuously increased, and then the tension is displayed through the display screen 50. Students can understand the principle of two-force balance through the numerical values displayed by the display screen 50, and the teaching is visual and convenient.

For example, in order to avoid the arc-shaped guide rail part 11 from affecting the movement of the tension meter 41, the top corner of the display board 10 is located at the center of the arc-shaped guide rail part 11, and the arc-shaped guide rail part 11 is concavely arranged on the display board 10. The top corner of the display board 10 is provided with a first bearing 15, the arm-of-force lever 201 comprises a hinged end 24 and a pulling end 25 which are oppositely arranged, the hinged end 24 is rotatably arranged on the first bearing 15, the pulling end 25 is provided with a second bearing 251, and the second bearing 251 is arranged in the arc-shaped guide rail part 11. The arc-shaped guide rail 11 is a groove-shaped guide rail, and comprises a bottom groove 113 and an upper groove 115 which are communicated with each other, the upper groove 115 penetrates through the surface of the display board 10, the tension end 25 is provided with a pivot rod 252, and the pivot rod 252 is inserted into the upper groove 115. The second bearing 251 is sleeved on the pivot rod 252 and located in the bottom recess 113, and the tension meter 41 is pulled and fastened to an end of the pivot rod 252 away from the second bearing 251. The arc-shaped guide rail part 11 is concavely arranged, so that the arc-shaped guide rail part 11 is prevented from influencing the movement of the tension meter 41, and the second bearing 251 is arranged to facilitate the movement of the tension end 25.

For example, in order to compensate for errors in the actual manufacturing process, the hinged end 24 is provided with a redundant segment 256 protruding outward in a direction away from the tension end 25, a third bearing 28 is disposed at a middle position of a connecting line between the tension end 25 and the hinged end 24, a distance between a center of the third bearing 28 and the tension end 25 is defined as a first distance, a distance between the third bearing 28 and the hinged end 24 is defined as a second distance, and the second distance is equal to the sum of the first distance and the length of the redundant segment 256. By setting the position of the third bearing 28, the installation of the pull rope 22 is further facilitated, and the gravity block 21 can be located at the gravity center position of the arm lever 201. In this process, the means to verify a two-force balance condition is a means to verify a two-force balance condition that does not ignore the mass of the shaft.

For example, to facilitate the student to observe the change of the arm length of the weight block 21, the pull rope 22 is connected to the third bearing 28. The first laser 23 is mounted at the upper end of the bearing and is used for keeping the transverse scale portion 12 irradiated upwards so as to mark the length of the transverse moment arm of the gravity block 21. Through setting up the first laser 23 to make the student pass through the transmission of laser, compare horizontal scale portion 12, with the scale of understanding the arm-length of power of gravity piece 21.

For example, in another situation, the tension meter 41 is always kept parallel to the ground, the side of the display board 10 is further provided with a longitudinal scale 17, the tension end 25 is further provided with a second laser 257, and the second laser 257 is used for emitting laser light to the longitudinal scale 17 to indicate the length of the longitudinal arm of the tension end 25. The transverse scale 12 and the longitudinal scale 17 are scales fixed on the edge of the display board 10 or scale marks engraved on the edge of the display board 10. The light emitting direction of the first laser 23 or the second laser 257 is inclined relative to the display board 10, and is perpendicular to the horizontal scale portion or the longitudinal scale portion 17. Through setting up the second laser 257 for the student can with the laser that second laser 257 sent with vertical scale portion 17 compares, thereby knows the change of arm of force length of tensiometer 41. The light emitting direction of the first laser 23 or the second laser 257 is inclined relative to the display board 10, so that the laser emitted by the lasers can be reflected on the longitudinal scale portion 17 or the transverse scale portion 12, and the laser can be conveniently recognized without being emitted in parallel, which causes the situation that the comparison is difficult.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.