Pulley combination device for physics teaching

Abstract

The utility model relates to the technical field of physics teaching aids, in particular to a pulley combination device for physics teaching, which comprises a base, a fixing plate is arranged at the top end of the base, the front end of the fixing plate is rotatably connected with a rotating column through a bearing, and the outer wall of the rotating column is fixedly sleeved with a lever. A plurality of fixing rings are arranged at the bottom end of the lever, a top plate is arranged at the front end of the fixing plate, a rack is arranged at the bottom end of the top plate, a lifting assembly is arranged in an inner cavity of the rack, and a lifting plate is arranged at the bottom end of the lifting assembly. According to the pulley combination device for physics teaching, the lifting assembly drives the lifting plate to slide downwards to abut against the top end of the lever, then the lever can be kept horizontal all the time, pulleys can be conveniently hung on the fixing ring for pulley combination demonstration, and the problems that in the prior art, a fixed pulley teaching aid can be single in the actual using process, and the teaching efficiency is high are solved. Only the principle of the fixed pulley can be demonstrated, and the limitation is large.

Description

TECHNICAL FIELD

[0001] The utility model relates to physical teaching aid technical field, concretely is a pulley combination device for physical teaching. BACKGROUND

[0002] When using pulley, the position of the shaft of the pulley that does not move is called a fixed pulley. The fixed pulley does not save effort, for example, 2N = 2N, but can change the direction of the force. It belongs to the application of pulley principle and the discussion of mechanical work. In essence, it is a lever with a power arm equal to a resistance arm, and the central shaft of the fixed pulley is fixed and does not move. The function of the fixed pulley is to change the direction of the force, but it cannot save effort. When pulling the weight, the fixed pulley can change the direction of the force to the direction of easy effort. When using the fixed pulley, the distance of the force pulling is equal to the distance of the object rising, and it cannot save effort or energy. The tension at both ends of the rope is equal, so the output force is equal to the input force, and the mechanical efficiency of the fixed pulley is close to 1 when friction is not considered.

[0003] In the process of demonstrating the principle of the fixed pulley in physical teaching, special teaching aids will be used, but the fixed pulley teaching aid of the prior art can only be used in actual use, and can only demonstrate the principle of the fixed pulley, which has great limitations. To solve this problem, a pulley combination device for physical teaching is provided. CONTENT OF THE UTILITY MODEL

[0004] The utility model aims at providing a pulley combination device for physical teaching to solve the problems in the background art. To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a pulley combination device for physical teaching, comprising a base, a fixed plate is arranged at the top end of the base, a rotating column is rotatably connected to the front end of the fixed plate through a bearing, a lever is fixedly sleeved on the outer wall of the rotating column, a plurality of fixed rings are arranged at the bottom end of the lever, a top plate is arranged at the front end of the fixed plate, a rack is arranged at the bottom end of the top plate, a lifting assembly is arranged in the inner cavity of the rack, and a lifting plate is arranged at the bottom end of the lifting assembly.

[0005] Preferably, an anti-skid pad is arranged at the bottom end of the base.

[0006] Preferably, the lifting assembly comprises a telescopic assembly, a lead screw, a moving cylinder, a worm gear, a worm and a knob, the telescopic assembly is arranged between the lifting plate and the top plate, one end of the lead screw is rotatably connected to the bottom end of the top plate through a bearing, the moving cylinder is screwed on the outer wall of the lead screw and is fixedly connected to the top end of the lifting plate, the worm gear is fixedly sleeved on the outer wall of the lead screw, one end of the worm is rotatably connected to the left side of the inner cavity of the rack through a bearing, and the other end of the worm extends to the right end of the rack and is fixedly connected with the knob.

[0007] Preferably, the worm is engaged with the worm gear.

[0008] Preferably, the telescopic assembly comprises a telescopic cylinder, a telescopic rod and a connecting assembly, the telescopic cylinder is arranged at the top end of the lifting plate, the telescopic rod is slidably inserted into the inner cavity of the telescopic cylinder and is fixedly connected with the bottom end of the top plate, and the connecting assembly is arranged in the inner cavity of the telescopic cylinder and is fixedly connected with the outer wall of the telescopic rod.

[0009] Preferably, the connecting assembly comprises a connecting groove and a connecting block, the connecting groove is arranged on one side of the inner wall of the telescopic cylinder, and the connecting block is slidably embedded in the inner cavity of the connecting groove and is fixedly connected with the outer wall of the telescopic rod.

[0010] Preferably, the inner cavity of the connecting groove and the outer wall of the connecting block are matched and are dovetail-shaped.

[0011] Compared with the prior art, the present application has the following beneficial effects:

[0012] 1. The rotating column rotatably connected to the front end of the fixed plate through the bearing and the lever fixedly sleeved on the rotating column can realize the demonstration of the lever principle, the weight can be fixed through the fixed ring, the lifting plate is driven by the lifting assembly to slide downward and abut against the top end of the lever, so that the lever can always remain horizontal, the fixed ring can be conveniently hung with the pulley for the demonstration of the pulley combination, and the problem that the fixed pulley teaching aid in the prior art can only demonstrate the principle of the fixed pulley in the actual use process and has great limitations is solved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a perspective view of the present application;

[0014] Figure 2 It is a bottom view of the present application;

[0015] Figure 3 It is a front sectional view of the telescopic cylinder of the present application;

[0016] Figure 4 It is an enlarged view of A of the present application. Figure 2

[0017] In the drawing: 1, base; 2, fixed plate; 3, rotating column; 4, lever; 5, fixed ring; 6, top plate; 7, rack; 8, lifting plate; 9, telescopic cylinder; 10, telescopic rod; 11, connecting groove; 12, connecting block; 13, screw rod; 14, moving cylinder; 15, worm; 16, knob. DETAILED DESCRIPTION

[0018] ​The technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings of the embodiments of the present utility model. Obviously, the described embodiments are only part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by the ordinary technical personnel in the field without creative labor belong to the scope of protection of the present utility model.

[0019] Please refer to Figures 1 to 4 The utility model provides a kind of technical scheme: a pulley combination device for physical teaching, including pedestal 1, the top of pedestal 1 is provided with fixed plate 2, the front end of fixed plate 2 is rotatably connected with rotating column 3 by bearing, the outer wall of rotating column 3 is fixedly sleeved with lever 4, the bottom of lever 4 is provided with a plurality of fixed rings 5, the front end of fixed plate 2 is provided with top plate 6, the bottom of top plate 6 is provided with rack 7, the inner chamber of rack 7 is provided with lifting assembly, the bottom of lifting assembly is provided with lifting plate 8, through the rotating column 3 of fixed plate 2 front end rotatably connected by bearing and the lever 4 of fixed sleeve on rotating column 3, the demonstration of lever 4 principle can be realized, through fixed ring 5 can be fixed to weight, through lifting assembly drives lifting plate 8 to slide down and rest on the top of lever 4, further can make lever 4 always keep horizontal, can be conveniently hung pulley on fixed ring 5 and carry out pulley combination demonstration, solve the problem that the fixed pulley teaching aid of prior art can be single in actual use process, only the principle of fixed pulley can be demonstrated, the problem of greater limitation.

[0020] In the embodiment, the bottom of the pedestal 1 is provided with a non-slip pad, which can improve the roughness of the bottom of the pedestal 1, and further improve the friction between the support plate and the ground.

[0021] In the embodiment, the lifting assembly includes a telescopic assembly, a lead screw 13, a moving cylinder 14, a worm gear, a worm 15, and a knob 16. The telescopic assembly is arranged between the lifting plate 8 and the top plate 6. One end of the lead screw 13 is rotatably connected to the bottom of the top plate 6 through a bearing. The moving cylinder 14 is screwed to the outer wall of the lead screw 13 and fixedly connected to the top of the lifting plate 8. The worm gear is fixedly sleeved on the outer wall of the lead screw 13. One end of the worm 15 is rotatably connected to the left side of the inner chamber of the rack 7 through a bearing. The other end of the worm 15 extends to the right end of the rack 7 and is fixedly connected to the knob 16. Rotating the knob 16 makes the knob 16 rotate the worm 15. Since the worm 15 is engaged with the worm gear, when the worm 15 rotates, the worm gear can drive the lead screw 13 to rotate. Under the action of the thread rotation force on the outer wall of the lead screw 13, when the lead screw 13 rotates, the moving cylinder 14 can push the lifting plate 8 to slide downward along a straight line under the limiting action of the telescopic cylinder 9 and the telescopic rod 10 and rest on the top of the lever 4, so that the lever 4 remains horizontal, avoiding tilting of the lever 4 during pulley combination demonstration.

[0022] In the embodiment, the worm 15 is engaged with the worm gear, so that the worm 15 can drive the worm gear to rotate when the worm 15 rotates.

[0023] In the embodiment, the telescopic assembly comprises the telescopic barrel 9, the telescopic rod 10 and the connecting assembly, the telescopic barrel 9 is arranged at the top end of the lifting plate 8, the telescopic rod 10 is slidably inserted into the inner cavity of the telescopic barrel 9 and is fixedly connected with the bottom end of the top plate 6, the connecting assembly is arranged in the inner cavity of the telescopic barrel 9 and is fixedly connected with the outer wall of the telescopic rod 10, so that the telescopic rod 10 can slide up and down in the inner cavity of the telescopic barrel 9 when the lifting plate 8 slides up and down, and the lifting plate 8 can always slide up and down along a straight line.

[0024] In the embodiment, the connecting assembly comprises the connecting groove 11 and the connecting block 12, the connecting groove 11 is arranged on one side of the inner wall of the telescopic barrel 9, and the connecting block 12 is slidably embedded in the inner cavity of the connecting groove 11 and is fixedly connected with the outer wall of the telescopic rod 10, so that one end of the telescopic rod 10 can always be inserted into the inner cavity of the telescopic barrel 9 under the joint action of the connecting groove 11 and the connecting block 12.

[0025] In the embodiment, the inner cavity of the connecting groove 11 and the outer wall of the connecting block 12 are matched and are dovetail-shaped, so that one end of the connecting block 12 can always be embedded in the inner cavity of the connecting groove 11.

[0026] The basic principle, main features and advantages of the utility model are shown and described above. It should be understood by the technical workers in the industry that the utility model is not limited by the above embodiments, the above embodiments and the description in the specification are only preferred examples of the utility model and are not used to limit the utility model, various changes and improvements of the utility model can be made without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A pulley assembly device for physical education, comprising a base (1), characterized in that: The top end of the base (1) is provided with a fixed plate (2), the front end of the fixed plate (2) is rotatably connected with a rotating column (3) through a bearing, the outer wall of the rotating column (3) is fixedly sleeved with a lever (4), the bottom end of the lever (4) is provided with a plurality of fixed rings (5), the front end of the fixed plate (2) is provided with a top plate (6), the bottom end of the top plate (6) is provided with a rack (7), the inner cavity of the rack (7) is provided with a lifting assembly, and the bottom end of the lifting assembly is provided with a lifting plate (8).

2. The pulley assembly of claim 1, wherein: The bottom end of the base (1) is provided with a non-slip pad.

3. The pulley assembly of claim 1, wherein: The lifting assembly comprises a telescopic assembly, a lead screw (13), a moving cylinder (14), a worm wheel, a worm (15) and a knob (16), the telescopic assembly is arranged between the lifting plate (8) and the top plate (6), one end of the lead screw (13) is rotatably connected to the bottom end of the top plate (6) through a bearing, the moving cylinder (14) is screwed on the outer wall of the lead screw (13) and is fixedly connected with the top end of the lifting plate (8), the worm wheel is fixedly sleeved on the outer wall of the lead screw (13), one end of the worm (15) is rotatably connected to the left side of the inner cavity of the rack (7) through a bearing, and the other end of the worm (15) extends to the right end of the rack (7) and is fixedly connected with the knob (16).

4. The pulley assembly of claim 3, wherein: The worm (15) is engaged with the worm wheel.

5. The pulley assembly of claim 3, wherein: The telescopic assembly comprises a telescopic cylinder (9), a telescopic rod (10) and a connecting assembly, the telescopic cylinder (9) is arranged at the top end of the lifting plate (8), the telescopic rod (10) is slidably inserted into the inner cavity of the telescopic cylinder (9) and is fixedly connected with the bottom end of the top plate (6), and the connecting assembly is arranged in the inner cavity of the telescopic cylinder (9) and is fixedly connected with the outer wall of the telescopic rod (10).

6. The pulley assembly of claim 5, wherein: The connecting assembly comprises a connecting groove (11) and a connecting block (12), the connecting groove (11) is formed in one side of the inner wall of the telescopic cylinder (9), and the connecting block (12) is slidably embedded in the inner cavity of the connecting groove (11) and is fixedly connected with the outer wall of the telescopic rod (10).

7. The pulley assembly of claim 6, wherein: The inner cavity of the connecting groove (11) and the outer wall of the connecting block (12) are matched and both are dovetail-shaped.

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