Mechanical efficiency experimental apparatus for pulley block

Abstract

The utility model relates to the field of physical experiment instruments, and discloses a mechanical efficiency experiment instrument of a pulley block, which comprises a measuring hanging plate, a fixed pulley, a movable pulley and a spring tension meter, a first connecting wire wound and connected through a spiral method is arranged between the fixed pulley and the movable pulley, an adjusting sliding hole is formed in the supporting plate, the upper end of the supporting plate is rotationally connected with a winding roller, the supporting plate is provided with a first motor for driving the winding roller to rotate, and the winding roller is fixedly connected with a second connecting wire; the end, penetrating through the adjusting sliding hole, of the second connecting line is fixedly connected with a spring tension meter, the lower end of the spring tension meter is fixedly connected with the first connecting line, a sliding block is slidably connected into the adjusting sliding hole, and the lower end of the sliding block is fixedly connected with a guide plate located on one side of the spring tension meter. Compared with the prior art, the device provided by the utility model has the advantages that an object can be conveniently driven to do uniform linear motion, and a single person can conveniently mark in an experiment process.

Description

Technical Field

[0001] The utility model relates to the technical field of physical experiment instruments, in particular to a mechanical efficiency experiment instrument for a pulley block. Background Art

[0002] In the process of middle school physics teaching, the mechanical efficiency of the pulley group is an important experimental lesson. The traditional experimental tools include a bracket, a pulley group, a weight, and a spring dynamometer. The experimenter needs to manually make the spring dynamometer move in a uniform linear motion to lift the spring dynamometer, and finally measure the lifting height of the spring dynamometer and the lifting height of the weight to calculate the mechanical efficiency of the pulley group. This experimental method is difficult to control the object to make a slow uniform linear motion, and also requires manual operation by the experimenter. When there is only one experimenter, it is also easy to be inconvenient to mark the measurement points, which brings certain difficulties to the conclusion and data analysis. Utility Model Content

[0003] 1. Technical issues to be resolved

[0004] The technical problem to be solved by the utility model is that it is difficult to control an object to perform slow uniform linear motion during an experiment, and it is inconvenient to record measurement points during the experiment.

[0005] (II) Technical solution

[0006] To solve the above technical problems, the utility model provides a technical solution as follows: a mechanical efficiency experimental device of a pulley group, comprising a measuring hanging plate, a fixed pulley, a movable pulley, and a spring dynamometer, the upper end of the measuring hanging plate is fixedly connected to a support plate, the fixed pulley is fixedly connected to the lower end of the support plate, a first connecting wire connected by spiral winding is arranged between the fixed pulley and the movable pulley, an adjusting slide hole is arranged on the support plate, a winding roller is rotatably connected to the upper end of the support plate, a first motor for driving the winding roller to rotate is arranged on the support plate, a second connecting wire is fixedly connected to the winding roller, one end of the second connecting wire passes through the adjusting slide hole and is fixedly connected to a spring dynamometer, the lower end of the spring dynamometer is fixedly connected to the first connecting wire, a slider is slidably connected in the adjusting slide hole, and a guide plate located on one side of the spring dynamometer is fixedly connected to the lower end of the slider.

[0007] As an improvement, the upper end of the support plate is fixedly connected to a second motor between the adjustment slide hole and the winding roller, the output end of the second motor is fixedly connected to an electric push rod, and the output end of the electric push rod is fixedly connected to a support pulley that cooperates with the second connecting line.

[0008] As an improvement, one side of the support plate is provided with a strip hole arranged along the length direction and connected to the adjustment sliding hole, and one side of the sliding block is threadedly connected with a fixing bolt slidably connected to the strip hole.

[0009] As an improvement, the upper end of the sliding block is fixedly connected to a limiting plate which is slidably connected to the upper end surface of the supporting plate.

[0010] As an improvement, the measuring hanging plate is provided with scale markings.

[0011] The guide plate is provided with at least one sliding roller on one side close to the spring dynamometer.

[0012] (III) Beneficial effects

[0013] Compared with the prior art, the utility model has the following advantages: the first motor drives the winding roller to reel in the second connecting wire, thereby achieving uniform lifting of the object, and the spring dynamometer can be positioned by the guide plate to adjust the spring dynamometer to a vertical state, thereby achieving uniform linear motion, and at the same time, the experimenter does not need to operate manually, which facilitates the experimenter to record the experimental data during the experiment. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a schematic diagram of the structure of a mechanical efficiency experiment device of a pulley block.

[0015] Figure 2 The utility model discloses an exploded diagram of a mechanical efficiency test apparatus of a pulley block.

[0016] Figure 3 It is a front view of a mechanical efficiency experimental device of a pulley block of the utility model.

[0017] As shown in the figure: 1. Measuring hanging plate; 2. Support plate; 3. Fixed pulley; 4. Movable pulley; 5. Spring dynamometer; 6. First connecting line; 7. Second connecting line; 8. First motor; 9. Winding roller; 10. Support pulley; 11. Electric push rod; 12. Second motor; 13. Adjusting slide hole; 14. Sliding block; 15. Guide plate; 16. Sliding roller; 17. Fixing bolt; 18. Strip hole; 19. Limiting plate. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments; based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0019] like Figures 1 to 3As shown, a mechanical efficiency experimental equipment of a pulley group includes a measuring hanging plate 1, a fixed pulley 3, a movable pulley 4, and a spring dynamometer 5. The measuring hanging plate 1 is provided with scale marks, the upper end of the measuring hanging plate 1 is fixedly connected to a support plate 2, the fixed pulley 3 is fixedly connected to the lower end of the support plate 2, a first connecting line 6 connected by spiral winding is provided between the fixed pulley 3 and the movable pulley 4, an adjusting slide hole 13 is provided on the support plate 2, a winding roller 9 is rotatably connected to the upper end of the support plate 2, a first motor 8 for driving the winding roller 9 to rotate is provided on the support plate 2, a second connecting line 7 is fixedly connected to the winding roller 9, the second connecting line 7 passes through the adjusting slide hole 13 and one end is fixedly connected to the spring dynamometer 5, and the lower end of the spring dynamometer 5 is fixedly connected to the first connecting line 6.

[0020] A slider 14 is slidably connected in the adjusting slide hole 13, and a strip hole 18 arranged along the length direction and connected to the adjusting slide hole 13 is provided on one side of the support plate 2. A fixing bolt 17 slidably connected to the strip hole 18 is threadedly connected on one side of the slider 14. A limit plate 19 slidably connected to the upper end surface of the support plate 2 is fixedly connected to the upper end of the slider 14, and a guide plate 15 located on one side of the spring dynamometer 5 is fixedly connected to the lower end of the slider 14. At least one sliding roller 16 is provided on the guide plate 15 close to the side of the spring dynamometer 5.

[0021] The upper end of the support plate 2 is located between the adjustment slide hole 13 and the winding roller 9 and is fixedly connected to a second motor 12. The output end of the second motor 12 is fixedly connected to an electric push rod 11. The output end of the electric push rod 11 is fixedly connected to a support pulley 10 that cooperates with the second connecting line 7.

[0022] In specific use, after the device is connected, the weight is connected to the lower end of the movable pulley 4, the second motor 12 is started to drive the electric push rod 11 to swing, and at the same time, the electric push rod 11 is driven to push the supporting pulley 10 to extend and retract forward and backward, and the position of the second connecting line 7 is adjusted to keep the spring dynamometer 5 in a vertical state as much as possible, and the fixing bolt 17 is loosened, and the slider 14 is pushed left and right to move along the adjusting slide hole 13. The slider 14 drives the guide plate 15 to move left and right so that the guide plate 15 moves to the side of the spring dynamometer 5, so that one side of the spring dynamometer 5 is close to the sliding roller 16 on the side of the guide plate 15, and then the second motor 12 and the electric push rod 1 are finely adjusted. 1, keep the spring dynamometer 5 parallel to the guide plate 15, tighten the fixing bolt 17, make the nut of the fixing bolt 17 rest on one side of the support plate 2, fix the position of the guide plate 15, reduce the friction between the guide plate 15 and the spring dynamometer 5 by the sliding roller 16, start the first motor 8 to drive the winding roller 9 to rotate to reel the second connecting line 7, and the second connecting line 7 passes through the supporting pulley 10 to pull the spring dynamometer 5 slowly upward along one side of the positioning plate, so as to realize the slow uniform linear motion of the spring dynamometer 5. During the experiment, the measuring point can be marked by controlling the start and stop of the first motor 8.

[0023] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0024] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0025] The above describes the utility model and its implementation methods, which are not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and do not deviate from the purpose of the invention of the utility model, they can creatively design a structure and embodiment similar to the technical solution, which should belong to the protection scope of the utility model.

Claims

1. A mechanical efficiency test apparatus for a pulley block, comprising a measuring hanging plate (1), a fixed pulley (3), a movable pulley (4), and a spring dynamometer (5), characterized in that: The upper end of the measuring hanging plate (1) is fixedly connected to a support plate (2), the fixed pulley (3) is fixedly connected to the lower end of the support plate (2), a first connecting line (6) connected by spiral winding is arranged between the fixed pulley (3) and the movable pulley (4), an adjusting sliding hole (13) is arranged on the support plate (2), a winding roller (9) is rotatably connected to the upper end of the support plate (2), a first motor (8) for driving the winding roller (9) to rotate is arranged on the support plate (2), a second connecting line (7) is fixedly connected to the winding roller (9), one end of the second connecting line (7) passes through the adjusting sliding hole (13) and is fixedly connected to a spring tension meter (5), the lower end of the spring tension meter (5) is fixedly connected to the first connecting line (6), a slider (14) is slidably connected in the adjusting sliding hole (13), and the lower end of the slider (14) is fixedly connected to a guide plate (15) located on one side of the spring tension meter (5).

2. The mechanical efficiency test device of a pulley block according to claim 1, characterized in that: The upper end of the support plate (2) is located between the adjusting slide hole (13) and the winding roller (9) and is fixedly connected to a second motor (12); the output end of the second motor (12) is fixedly connected to an electric push rod (11); the output end of the electric push rod (11) is fixedly connected to a support pulley (10) that cooperates with the second connecting line (7).

3. The mechanical efficiency test device of a pulley block according to claim 1, characterized in that: One side of the support plate (2) is provided with a strip hole (18) arranged along the length direction and communicating with the adjusting sliding hole (13); one side of the sliding block (14) is threadedly connected with a fixing bolt (17) in a sliding connection with the strip hole (18).

4. The mechanical efficiency test device of a pulley block according to claim 1, characterized in that: The upper end of the sliding block (14) is fixedly connected to a limiting plate (19) which is slidably connected to the upper end surface of the supporting plate (2).

5. The mechanical efficiency test device of a pulley block according to claim 1, characterized in that: The measuring hanging plate (1) is provided with scale markings.

6. The mechanical efficiency test device of a pulley block according to claim 1, characterized in that: The guide plate (15) is provided with at least one sliding roller (16) on one side close to the spring dynamometer (5).

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