Lever scientific small experiment device

Abstract

The utility model is applicable to the technical field of experimental equipment, and provides a lever scientific small experimental device which comprises a base, a vertical rod and a rod ruler, marked lines are arranged on two sides of the rod ruler, a plurality of hanging rings are arranged at the bottom of one side of the rod ruler, a long groove is formed in the other side of the rod ruler, a row of groove positions are formed in the long groove, and connecting pieces are hung on the groove positions. A sliding seat is arranged on the base, a locking mechanism, an electronic tension meter and a fixed pulley are arranged on the sliding seat, a pull rope is led out of the acting end of the electronic tension meter, and the pull rope is connected to the connecting piece after bypassing the fixed pulley. In the structure of the device, the fixed pulley and the electronic tension meter are simultaneously arranged on the sliding seat and can synchronously move, and the sliding seat can be quickly moved and locked along the sliding chute through the locking mechanism without adjusting the length of the pull rope, so that the connection operation of the pull rope at different positions of the rod ruler can be quickly completed. And the structural design of the positions of the long groove and the groove is also convenient to adjust and limit the position of the connecting piece.

Description

Technical Field

[0001] This utility model belongs to the field of experimental equipment technology, and in particular relates to a lever science small experimental device. Background Technology

[0002] When learning and researching the relationship between force and lever arm, lever experimental devices can provide a visual demonstration and aid in understanding the knowledge. Currently, lever experimental devices generally include a support frame with a lever mounted on it. There are two types of structures: one where weights are hung on both sides of the lever, and the other where weights are hung on one side of the lever and a force gauge on the other.

[0003] In the first structure, the bottom of the pole has several fixed hanging rings. By hanging weights of different weights on different hanging rings, the pole remains balanced on both sides. In the second structure, a weight is hung on one side of the pole, and the other side is directly connected to a tension gauge. One end of the tension gauge is connected to the base, or via a guide wheel. A tension cable is led out from the tension gauge, passes around the guide wheel, and connects to the other side of the pole.

[0004] Using a fixed pulley can avoid the influence of the pull gauge's weight. However, in this structure, when the pull rope is connected to different positions on the rod, the position of the pull gauge is generally fixed. Therefore, it is necessary to move the position of the fixed pulley accordingly and adjust the pull rope's position, which increases the complexity of operation. Moreover, the movement position of the fixed pulley is not easy to control accurately. Utility Model Content

[0005] In view of the above problems, the purpose of this utility model is to provide a lever science small experimental device to solve the above technical problems.

[0006] The present invention adopts the following technical solution:

[0007] The lever science experimental device includes a base with a vertical rod on it. A lever ruler is rotatably mounted on the top of the vertical rod. Markings are provided on both sides of the lever ruler. Several hanging rings are provided at the bottom of one side of the lever ruler. A long groove is opened on the other side of the lever ruler, and a row of groove positions is formed downward on the long groove. Connectors are hung in the groove positions. A sliding groove parallel to the lever ruler is opened on the base. A sliding seat is provided on the sliding groove. The sliding seat is equipped with a locking mechanism, an electronic tension gauge, and a fixed pulley. A pull rope is led out from the working end of the electronic tension gauge, and the pull rope passes around the fixed pulley and connects to the connector.

[0008] Furthermore, the base has a scale line on the front side of the slide, and the front side of the slide also has an indicator block facing the scale line.

[0009] Furthermore, the locking mechanism includes a pair of T-shaped rods that pass through the slide groove, and an eccentric roller is rotatably disposed between the tops of the two T-shaped rods, with an operating part formed on the surface of the eccentric roller.

[0010] Further, the sliding seat is further provided with a placing groove, the electronic tension meter is clamped into the placing groove, and the side wall of the placing groove is further provided with a notch.

[0011] Further, the connecting piece comprises an L-shaped piece, a short column is arranged on the inner side of the L-shaped piece, a stop block is arranged on the outer end of the short column, and a connecting ring is arranged on the bottom of the L-shaped piece.

[0012] Further, the top of the vertical rod is further provided with a limiting part moving up and down, the limiting part and the opposite end of the vertical rod are both provided with a half-ring groove, guide rods are arranged on the two sides of the limiting part, guide parts are arranged on the two sides of the vertical rod, the guide rods pass through the guide parts, and springs are arranged between the guide rods and the guide parts.

[0013] Further, a rotating shaft piece is arranged at the position of the rotating shaft of the ruler, and one end of the rotating shaft piece is a circular block arranged between the half-ring grooves.

[0014] The device has the advantages that: in the device structure, the fixed pulley and the electronic tension meter are arranged on the sliding seat to be synchronously moved, the sliding seat is quickly moved along the sliding groove and locked through the locking mechanism, the length of the pull rope does not need to be adjusted, and therefore the connection operation of the pull rope at different positions of the ruler can be quickly completed. In the preferred structure, the base is further provided with scale lines, the front side of the sliding seat is provided with an indicating block, the position of the scale line indicated by the indicating block can be used to accurately adjust the position of the sliding seat, the pull rope can be kept in a vertical state, and the result accuracy is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a perspective view of the lever scientific small experiment device provided by the embodiment of the present application Figure 1 ;

[0016] Figure 2 is a perspective view of the lever scientific small experiment device provided by the embodiment of the present application Figure 2 ;

[0017] Figure 3 is a perspective view of the lever scientific small experiment device provided by the embodiment of the present application Figure 3 ;

[0018] Figure 4 is a partial enlargement of the connecting piece position Figure 1 ;

[0019] Figure 5 is a partial enlargement of the connecting piece position Figure 2 ;

[0020] Figure 6 is a partial sectional view of the vertical rod position. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be further described in detail by combining with the drawings and examples.

[0022] In order to illustrate the technical scheme of the utility model, the following will be described by specific examples.

[0023] As Figures 1-5 The lever scientific experiment device provided by the embodiment comprises a base 1, the base 1 is provided with a vertical rod 2, the vertical rod 2 is provided with a rod ruler 3 rotatably at the top, the rod ruler 3 is provided with a scale line 31 on both sides, a plurality of hanging rings 32 are arranged at the bottom of one side of the rod ruler 3, a long slot 6 is formed on the other side of the rod ruler 3, a plurality of recessed groove positions 61 are formed downwardly on the long slot 6, a connecting piece 7 is hung on the recessed groove positions 61, a sliding slot 11 parallel to the rod ruler is formed on the base 1, a sliding seat 8 is arranged on the sliding slot 11, a locking mechanism 9, an electronic tension meter 4 and a fixed pulley 5 are arranged on the sliding seat 8, the electronic tension meter 4 is provided with a pulling rope 41, and the pulling rope 41 is connected to the connecting piece 7 after passing through the fixed pulley 5.

[0024] In the structure, a plurality of hanging rings 32 are arranged at the bottom of the left side of the rod ruler, the hanging rings are used for hanging hanging weights of different weights, and one of the hanging rings is hung in each experiment. The right side of the rod ruler is provided with a long slot, and a plurality of recessed groove positions are formed equidistantly on the long slot. The connecting piece is controlled to be arranged at different recessed groove positions, so that different lengths of force arms are formed. The left and right surfaces of the rod ruler are provided with scale lines, which are used for indicating the distance from the rotating shaft position of the rod ruler, that is, the length of the force arm.

[0025] The sliding slot is a pair, the sliding seat is perpendicular to the sliding slot, the rod ruler and the like, and the electronic tension meter and the fixed pulley are arranged on the sliding seat and can be adjusted synchronously. Figure 1 As shown in the specific operation, the base 1 is provided with a scale line 12 on the front side of the sliding seat, and the sliding seat 8 is further provided with an indicating block 81 facing the scale line 12. After the position of the connecting piece is adjusted, the sliding seat is adjusted so that the indicating block points to the same position of the scale line, so that the pulling rope can be kept vertical after the pulling rope is connected to the connecting piece.

[0026] In the experiment, a hanging weight of a certain weight is hung on the hanging ring on the left side, and the force arm reading of the hanging ring is recorded at the same time. After the position of the connecting piece and the sliding seat is adjusted, the pulling rope is connected to the connecting piece. Under the weight of the hanging weight, the rod ruler is horizontal, and the pulling rope is straight, the reading of the electronic tension meter is read out, and the force arm reading corresponding to the connecting piece is recorded. Through a plurality of experiments, the relationship among the tension, the gravity of the hanging weight and the force arm can be learned and researched. The length of the pulling rope does not need to be adjusted in the whole experiment process, and the operation is relatively simple. Moreover, the recessed groove positions are arranged, so that the position of the connecting piece is limited.

[0027] Need to explain, this structure by locking mechanism locking slide. As a specific structure, combined Figures 1-3 As shown, the locking mechanism 9 includes a pair of T-shaped rod 91 into the chute, the top of the two T-shaped rod 91 between the rotation of the eccentric roller 92, the surface of the eccentric roller 92 is formed with the operating part 93. The state shown is the locked state, the thicker position of the eccentric roller 92 and the slide extrusion to achieve slide compression base and then complete the fixed. When you need to release the slide, turn the operating part 93 up, simple operation.

[0028] In addition, the slide 8 is also provided with a placement slot 82, the electronic tensile tester 4 is inserted into the placement slot 82, and the side wall of the placement slot 82 has a notch 83. In this embodiment, the electronic tensile tester can be directly inserted into the placement slot 82, and the two notches 83 of the side wall are used for facilitating the taking out of the electronic tensile tester.

[0029] As Figure 4 , 5 As a specific structure, the connecting piece 7 includes an L-shaped piece 71, the inside of the L-shaped piece 71 has a short column 72, the outer end of the short column 72 is provided with a stop block 73, and the bottom of the L-shaped piece 71 has a connecting ring 74. Through the front and back limiting of the L-shaped piece 71 and the stop block 73, the connecting piece 7 will not be separated from the long groove and the groove position. The connecting piece 7 is made of plastic material, which is relatively light in texture and does not affect the conclusion statistics.

[0030] As shown in Figure 6 Further, the top of the stand 2 also has a limiting part 21 that moves up and down, the limiting part 21 and the opposite end of the stand 2 both have a half-ring groove 22, the two sides of the limiting part 21 have a guide rod 24, the two sides of the stand 2 have a guide part 25, the guide rod 24 penetrates the guide part 25, and a spring 26 is arranged between the distal end of the guide rod 24 and the guide part 25. The spring has a small spring constant.

[0031] In the figure, the ruler has different lengths on the left and right sides, and the left side is shorter than the right side. As shown in Figure 6 The left end of the ruler has a slot, the slot has a screw rod, the screw rod has a adjusting block screwed into it, and the adjusting block is arranged to adjust the counterweight, so that the ruler is balanced on the left and right sides under no load. Further, the pivot position of the ruler 3 is rotationally provided with a pivot piece 33, one end of the pivot piece 33 being a circular block 34 for mounting between the half-ring grooves. The stand is inserted into the base in the form of resistance, the limiting part 21 is pulled upward, the spring 26 is compressed, and the pair of half-ring grooves 22 is opened, so that the ruler can be directly taken off, which is convenient for storage. Moreover, the stand can also be directly taken off, which is further convenient for storage.

[0032] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A lever science experiment device, comprising a base, a vertical rod on the base, a rod ruler rotatably arranged at the top of the vertical rod, and a scale mark arranged on both sides of the rod ruler, characterized in that, The one side bottom of the rod ruler is provided with a plurality of hanging rings, the other side of the rod ruler is provided with a long slot, a row of recessed positions are formed downward on the long slot, a connecting piece is hung on the recessed positions, a sliding groove parallel to the rod ruler is formed on the base, a sliding seat is arranged on the sliding groove, a locking mechanism, an electronic tension meter and a fixed pulley are arranged on the sliding seat, the action end of the electronic tension meter is led out with a pull rope, the pull rope is connected to the connecting piece after winding around the fixed pulley.

2. The lever science experimental apparatus as described in claim 1, characterized in that, The base is provided with a scale line on the front side of the sliding seat, and the front side of the sliding seat is also provided with an indicating block facing the scale line.

3. The lever science experimental apparatus as described in claim 2, characterized in that, The locking mechanism comprises a pair of T-shaped rods penetrating into the sliding groove, an eccentric roller is rotatably arranged between the top portions of the two T-shaped rods, and the surface of the eccentric roller is formed with an operating portion.

4. The lever science experiment apparatus of claim 3, wherein the lever science experiment apparatus further comprises a lever arm, a fulcrum, and a weight. The sliding seat is also provided with a placing groove, the electronic tension meter is clamped into the placing groove, and the side wall of the placing groove is also provided with a notch.

5. The lever science experiment apparatus of claim 4, wherein the lever is a lever arm. The connecting piece comprises an L-shaped piece, the inner side of the L-shaped piece is provided with a short column, the outer end of the short column is provided with a stop block, and the bottom of the L-shaped piece is provided with a connecting ring.

6. The lever science experiment apparatus of any one of claims 1-5, wherein, The top of the vertical rod is also provided with a limiting portion moving up and down, the opposite ends of the limiting portion and the vertical rod are both provided with a half ring groove, the two sides of the limiting portion are provided with guide rods, the two sides of the vertical rod are provided with guide portions, the guide rods penetrate out of the guide portions, and springs are arranged between the guide rods and the guide portions.

7. The lever science experiment apparatus of claim 6, wherein the lever is a lever arm. The pivot position of the rod ruler is rotatably provided with a pivot piece, and one end of the pivot piece is a circular block for being installed between the half ring grooves.

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