CN210836747U

CN210836747U - Force disc tester

Info

Publication number: CN210836747U
Application number: CN201921161583.0U
Authority: CN
Inventors: 王知非
Original assignee: Jiangsu Suweier Science Technology Co ltd
Current assignee: Jiangsu Suweier Science Technology Co ltd
Priority date: 2019-07-23
Filing date: 2019-07-23
Publication date: 2020-06-23
Anticipated expiration: 2029-07-23

Abstract

The utility model particularly relates to a force plate tester, which comprises a base and a supporting upright rod; the surface of the circular dial is provided with angle scales, and the back surface of the circular dial is fixed on the supporting upright stanchion; the first force arm, the second force arm and the third force arm are all strip-shaped; the first force arm, the second force arm and the third force arm are arranged on the back of the dial; the inner end vertexes of the first, second and third parts are overlapped and rotatably fixed at the circle center position of the dial; the first force arm and the second force arm can be fixed on the edge of the dial, and force sensors are arranged at the outer end of the dial; the output ring of the force sensor is buckled with one end of the thin wire, and the other end of the thin wire is tied on the circular ring; the circular ring is arranged at the circle center of the disc; the third force arm can be fixed at the edge of the disc through a clamping structure, and two fixed pulleys which rotate the same on the same surface are fixed in parallel; one end of a thin line passing through the fixed pulley is connected to the circular ring, and the other end of the thin line is tied to the hook code. The utility model discloses can provide the synthesis and the decomposition of the ascending power of arbitrary direction.

Description

Force disc tester

Technical Field

The utility model relates to a teaching experiment equipment technical field, concretely relates to power disc experiment ware.

Background

The synthesis and the decomposition of the force are key points in the middle school physics teaching, and the parallelogram rule for verifying the force is important content in the physics experiment teaching and the student theoretical learning, and the experiment is also one of the necessary experiments for high school students. When the two forces are combined, a line segment representing the two forces is taken as a leading edge to form a parallelogram, and the diagonal line of the parallelogram represents the magnitude and the direction of the resultant force. The experimental methods for the parallelogram rule are equivalent and equilibrium. The equivalent method is that two component forces act on the same point of an object together to make the object generate certain deformation or acceleration. Then a force is acted on the action point when the two partial forces act independently, and the magnitude and the direction of the force are adjusted, so that the stressed object generates the same deformation or acceleration when the two partial forces act together. Because the measurement of the acceleration is complex, the same deformation of the stressed object is usually adopted by the component force and the resultant force, and the equivalence of the combined action of the two component forces and the independent action of the resultant force is realized. In this case, a force equivalent to the combined action of the two component forces represents the resultant of the two component forces. Generally, a rubber band is selected as a stressed object, one end of the rubber band is fixed, and the other end of the rubber band is simultaneously pulled by two forces F1 and F2 which form an angle with each other, so that the rubber band generates a certain extension. Then, the rubber band is pulled by a force F alone to generate the same elongation as the two pulling forces, and the resultant force of the two component forces is the same as F. F is the measured resultant force. Then, the resultant force of F1 and F2 is obtained by using the parallelogram rule. The resultant force of F, F1 and F2 are compared to see if they are equal in magnitude and same in direction. The key of success or failure of the experiment is the control of equivalence and error. The equivalence is realized, namely the two elongations of the rubber band are equal, and the tail end of the rubber band is required to be pulled to the same position twice. The balance method is that three constant forces act on the same point of the object at the same time, when the stressed object is in a static state or a uniform linear motion state, the three forces are balanced, wherein the resultant force of any two forces is equal to the third force in magnitude and opposite in direction. If any two forces are taken as component forces, the magnitude of the third force represents the magnitude of the resultant force of the first two forces, and the opposite direction of the third force represents the direction of the resultant force. In the experiment, one ends of three light rope sleeves are generally tied together, and the knot points are used as stressed objects. Then a weight is hung on one of the rope sleeves, the other two rope sleeves are respectively pulled in two directions which form an angle with each other in a vertical plane by using two spring load cells, and when the weight is at rest, the three forces are balanced. For convenience of experiment and measurement, the stressed particles are usually kept in a static state, so that the balance of three forces is realized. The key point of the experiment is to control the stressed particles to be in a static state.

The prior art Chinese patent application numbers are: 201210013709.6 the invention name is: a moment disk experiment device with force and angle measurement function is disclosed, which verifies the parallelogram rule in the mechanics law through a sensor force arm moment disk, a cotton rope, a weight data collector and a computer. However, there are the following problems: (1) only the component force of gravity can be measured; (2) the angle of the component force is inconvenient to change.

Disclosure of Invention

1. The technical problem to be solved is as follows:

to foretell technical problem, the utility model discloses improve current scheme, provide a power disc experiment ware. The experimental device does not overcome the problem that the experimental device only can carry out synthesis and decomposition experiments on vertical upward force in the prior art, and the experimental conclusion can be more universal.

2. The technical scheme is as follows:

the utility model provides a force plate experiment ware which characterized in that: comprises a base component, a dial, a force arm component, a pulley component and a hook component; the base body assembly comprises a base and a supporting upright rod vertically arranged on the upper surface of the base; the dial is a disc; the surface of the dial is provided with angle scales; the back of the dial is fixed on the supporting upright stanchion; the graduated surface of the dial faces the outer end; the moment arm assembly comprises a first moment arm, a second moment arm and a third moment arm; the first force arm, the second force arm and the third force arm are all strip-shaped; the first force arm, the second force arm and the third force arm are arranged on the back of the dial; the vertexes of the inner ends of the first force arm, the second force arm and the third force arm are overlapped and rotatably fixed at the circle center position of the dial; the middle position of the first force arm and the second force arm can be fixed on the edge of the dial through a clamping structure; force sensors are arranged at the outer ends of the dial of the first force arm and the second force arm; the output ring of the force sensor is buckled with one end of the thin wire, and the other end of the thin wire is tied on the circular ring; the circular ring is arranged at the circle center of the disc; the third force arm can be fixed at the edge of the disc through a clamping structure, two same fixed pulleys are fixed at the outer end of the third force arm in parallel and rotate on the same surface; one end of a thin line passing through the fixed pulley is connected to the circular ring, and the other end of the thin line is tied to the hook code.

Furthermore, the force sensor is provided with a USB interface, and the measured force is transmitted to the computer through the USB interface during the experiment.

Further, the thin thread is a fishing line; the thin line is connected with the circular ring through a fishhook.

3. Has the advantages that:

the utility model discloses an adopt a set of fixed pulley of the third arm of force, provide the pulling force to the arbitrary ascending direction of ring, realize the change to the component direction through the clamping structure of the first arm of force and the second arm of force. The utility model discloses in gather the size of two component forces through force transducer, read out the angle between two component forces through the angle scale on moment dish surface, calculate the parallelogram through the computer synthesis or oneself to verify the parallelogram rule of mechanics.

Drawings

Fig. 1 is a structural diagram of a first embodiment of the present invention;

FIG. 2 is a diagram of a second embodiment of the present invention;

fig. 3 is a connection diagram of the ring of the present invention.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings.

The utility model provides a force plate experiment ware which characterized in that: comprises a base component, a dial, a force arm component, a pulley component and a hook component; the base body component comprises a base 11 and a supporting upright rod 12 vertically arranged on the upper surface of the base; the dial 2 is a disc; the surface of the dial is provided with angle scales; the back of the dial is fixed on the supporting upright stanchion; the graduated surface of the dial faces the outer end; the moment arm assembly comprises a first moment arm 31, a second moment arm 32 and a third moment arm 33; the first force arm 31, the second force arm 32 and the third force arm 33 are all long strips; the first force arm, the second force arm and the third force arm are arranged on the back of the dial; the vertexes of the inner ends of the first force arm, the second force arm and the third force arm are overlapped and rotatably fixed at the circle center position of the dial; the middle position of the first force arm and the second force arm can be fixed on the edge of the dial through a clamping structure; force sensors 4 are arranged at the outer ends of the first force arm and the second force arm, which extend out of the dial; the output ring of the force sensor is buckled with one end of the thin wire, and the other end of the thin wire is tied on the circular ring; the circular ring is arranged at the circle center of the disc; the third force arm can be fixed at the edge of the disc through a clamping structure, two identical fixed pulleys 5 are fixed at the outer end of the third force arm in parallel and rotate on the same surface; one end of a thin wire passing through the fixed pulley is connected to the circular ring 6, and the other end of the thin wire is tied to the hook code 7.

Further, the thin thread is a fishing line; the thin line is connected with the circular ring through a fishhook. As shown in figure 3, two force arms are sleeved on the ring through the fishhook, and the other force arm can also be sleeved through the fishhook. The left and right of the figure are a first force arm and a second force arm, and the upper end of the cylindrical structure is a connecting rod with the force sensor. In the experiment process, the position of the circular ring is fixed at the circle center of the dial by adjusting the length of the thin wire.

In the specific embodiment 1, the resultant force is in an obliquely upward direction as shown in fig. 1, as can be seen from the figure, the direction of the resultant force is obliquely upward, the magnitude of the resultant force is controlled by the number of hook codes, and the angle of the resultant force is determined by observing the angle on the dial; the magnitude of the two force components is obtained by a force sensor connected with a thin line, and the angle of the force components can be determined by observing the angle of the dial surface. In this device, the ring is used as the force-receiving object, and the ring is in a static state, so that the resultant force applied to the ring is zero. The parallelogram rule can be verified by calculating the resultant force of the first and second force arms and comparing the resultant force with the gravity of the hook code of the third force arm.

In the specific embodiment 2, as shown in fig. 2, the resultant force is in a diagonally downward direction, as can be seen from the figure, the direction of the resultant force is diagonally downward, the magnitude of the resultant force is controlled by the number of hook codes, and the angle of the resultant force is determined by observing the angle on the dial; the magnitude of the two force components is obtained by a force sensor connected with a thin line, and the angle of the force components can be determined by observing the angle of the dial surface. In this device, the ring is used as the force-receiving object, and the ring is in a static state, so that the resultant force applied to the ring is zero. The parallelogram rule can be verified by calculating the resultant force of the first and second force arms and comparing the resultant force with the gravity of the hook code of the third force arm.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a force plate experiment ware which characterized in that: comprises a base component, a dial (2), a force arm component, a pulley component and a hook component;

the base body component comprises a base (11) and a supporting upright rod (12) vertically arranged on the upper surface of the base (11);

the dial (2) is a disc; the surface of the dial (2) is provided with angle scales; the back of the dial (2) is fixed on the supporting upright rod (12); the graduated surface of the dial (2) faces the outer end;

the moment arm assembly comprises a first moment arm (31), a second moment arm (32) and a third moment arm (33); the first force arm (31), the second force arm and the third force arm (33) are all strip-shaped; the first force arm (31), the second force arm (32) and the third force arm (33) are arranged on the back of the dial (2); the vertexes of the inner ends of the first force arm (31), the second force arm (32) and the third force arm (33) are overlapped and rotatably fixed at the circle center position of the dial (2); the middle position of the first force arm (31) and the second force arm (32) can be fixed on the edge of the dial (2) through a clamping structure; the outer ends of the first force arm (31) and the second force arm (32) extending out of the dial (2) are provided with force sensors (4); the output ring of the force sensor (4) is buckled with one end of a thin wire, and the other end of the thin wire is tied on the circular ring (6); the circular ring (6) is arranged at the circle center of the disc; the third force arm (33) can be fixed at the edge of the disc through a clamping structure, two identical fixed pulleys (5) are fixed in parallel at the outer end of the third force arm (33) extending out of the dial (2), and the two fixed pulleys (5) rotate on the same surface; one end of a thin line passing through the fixed pulley (5) is connected to the circular ring (6), and the other end is tied to the hook code (7).

2. The force plate tester of claim 1, wherein: the force sensor (4) is provided with a USB interface, and the measured force is transmitted to the computer through the USB interface during the experiment.

3. The force plate tester of claim 1, wherein: the thin line is a fish wire; the thin line is connected with the circular ring (6) through a fishhook.