Ratchet wheel stepping mechanism

Abstract

The utility model relates to the technical field of digital design and manufacturing, and discloses a ratchet wheel stepping mechanism which comprises a bottom plate, and the upper surface of the bottom plate is fixedly connected with a box body, a cam support and a ratchet wheel support. Through cooperation of a cam shaft, a large bevel gear, a pushing piece, a step screw, a pawl, a ratchet shaft, a ratchet body and an external thread bearing, kinetic energy is received through a large driving wheel on the cam shaft, then the outer surface of a cam on the cam shaft makes contact with the external thread bearing, and the pushing piece is driven to swing by a fixed angle around the step screw fixed to a box body; when the cam returns, the pushing piece resets, so that rotation of the ratchet wheel body is avoided, fixed-distance rotation of the ratchet wheel body is facilitated, pictures of stepping rotation of the ratchet wheel are conveniently demonstrated, students can conveniently operate the ratchet wheel, and the students can better understand the ratchet wheel stepping principle; the teaching effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of digital design and manufacturing, in particular to a ratchet stepping mechanism. Background Art

[0002] Digital design and manufacturing technology is a new major for intelligent and digital reform and development. It is a popular major in the equipment manufacturing industry. Production training is an important learning link. Its purpose is to enable us to acquire basic production perceptual knowledge, combine theory with practice, and expand our knowledge. At the same time, production training is an important channel for training and cultivating students' abilities and qualities, cultivating students' serious spirit, and cultivating our initial ability to take on technical work. These practical knowledge are very necessary foundations for our study of subsequent courses and even future work. Among them, the ratchet stepping mechanism is a common structure in training;

[0003] The ratchet gear is usually one-way gear, and the pawl is hinged on the rocker. When the rocker swings counterclockwise, the driving pawl is inserted into the ratchet teeth to drive the ratchet to rotate in the same direction; when the rocker swings clockwise, the pawl slides over the ratchet and the ratchet stops rotating. In order to ensure that the ratchet does not reverse, a non-reverse pawl is often installed on the fixed component. The reciprocating swing of the rocker can be achieved by a crank rocker mechanism, a gear mechanism, and a swing cylinder.

[0004] However, most of the existing ratchet stepping mechanisms are driven by driving devices. The driving devices cannot well demonstrate the stepping process to students during teaching, so that students cannot understand the principle of ratchet stepping very well. Therefore, there is room for improvement in the principle demonstration. Therefore, we need to propose a ratchet stepping mechanism. Utility Model Content

[0005] The purpose of the utility model is to provide a ratchet stepping mechanism with a simple structure, which is convenient for demonstrating the ratchet stepping rotation, making it easy for trainees to operate it, thereby improving trainees' understanding of the ratchet stepping principle, so that trainees can use this principle when making their own practical training, thereby improving the teaching effect on trainees and solving the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a ratchet stepping mechanism comprises a base plate, the upper surface of the base plate is fixedly connected to a box body, a cam support and a ratchet support, an upper end of one side of the ratchet support is rotatably connected to a ratchet shaft, one end of the ratchet shaft is fixedly connected to a ratchet body, a camshaft is rotatably connected to the cam support, one end of the camshaft is fixedly connected to a large bevel gear, one side of the box body is rotatably connected to a step screw, one end of the step screw is rotatably connected to a pusher, one end of the pusher is provided with an externally threaded bearing, the outer side of the externally threaded bearing conflicts with the outer side of a cam on the camshaft, the upper end of the pusher is rotatably connected to a pawl through the step screw, and one end of the pawl is inserted into the tooth groove of the ratchet body.

[0007] Preferably, a box cover is fixedly connected to the other side of the box body, and a power input shaft and a driven input shaft are rotatably connected to one side of the box cover. One end of the power input shaft is fixedly connected to a large synchronous pulley, and one end of the driven input shaft is fixedly connected to a small synchronous pulley. The large synchronous pulley and the small synchronous pulley are connected via a belt drive.

[0008] Preferably, one end of the power input shaft is fixedly connected to a turntable, one side of the turntable is fixedly connected to a handle along an edge, and the axis of the power input shaft and the axis of the camshaft are both arranged on the same axis.

[0009] Preferably, an adjustment support is provided on the upper surface of the base plate, a locking bolt is slidably connected to one side of the adjustment support, one end of the locking bolt is threadedly connected to an idle wheel, the outer side of the idle wheel is in conflict with the outer side of the belt, and two groups of sliding grooves are opened on the upper surface of the base plate, and locking bolts threadedly connected to the adjustment support are slidably connected in both groups of sliding grooves.

[0010] Preferably, the other end of the driven input shaft is rotatably connected to one side of the inner cavity of the housing, and a small helical gear is fixedly connected to the outer side of the driven input shaft.

[0011] Preferably, two groups of dynamic shaft bearing supports are symmetrically arranged on the upper surface of the base plate, a transmission shaft is rotatably connected between the two groups of dynamic shaft bearing supports, a large helical gear meshing with a small helical gear is arranged in the middle of the outer side of the transmission shaft, and the transmission shaft and the driven input shaft are vertically arranged in an offset manner.

[0012] Preferably, one end of the transmission shaft is fixedly connected with a small bevel gear, the small bevel gear is meshed with a large bevel gear, and the transmission shaft and the camshaft are vertically arranged in an offset manner.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] The utility model mainly receives kinetic energy through the cooperation between the camshaft, the large bevel gear, the pushing member, the step screw, the pawl, the ratchet shaft, the ratchet body and the external threaded bearing, and then drives the pushing member to swing around the step screw fixed on the box body at a fixed angle through the cooperation between the camshaft, the large bevel gear, the pushing member, the step screw, the pawl, the ratchet shaft, the ratchet body and the external threaded bearing, so as to make the outer surface of the cam on the camshaft contact with the external threaded bearing, thereby making the pushing member drive the ratchet body to make a unidirectional rotation around the pawl on the pushing member, and the pushing member is reset when the cam returns, thereby avoiding the rotation of the ratchet body, so that the ratchet body can rotate at a fixed distance, and the picture of the ratchet stepping rotation can be demonstrated conveniently, so that the trainees can operate conveniently, thereby improving the trainees' understanding of the ratchet stepping principle and improving the teaching effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall front structure of the utility model;

[0016] Figure 2 This is a front view of the internal structure of the box of the utility model;

[0017] Figure 3 This is a schematic diagram of the rear view structure of the interior of the box of the utility model;

[0018] Figure 4 It is a schematic diagram of the cross-sectional structure of the camshaft of the present utility model.

[0019] In the figure: 1. bottom plate; 2. box body; 3. box cover; 4. adjustment support; 5. locking bolt; 6. idler; 7. power input shaft; 8. large synchronous pulley; 9. belt; 10. driven input shaft; 11. small synchronous pulley; 12. small bevel gear; 13. driving shaft bearing support; 14. large bevel gear; 15. transmission shaft; 16. small bevel gear; 17. cam support; 18. camshaft; 19. large bevel gear; 20. ratchet support; 21. ratchet shaft; 22. ratchet body; 23. pusher; 24. external threaded bearing; 25. ratchet pawl; 26. step screw; 27. turntable; 28. handle. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-4The utility model provides a technical solution: a ratchet stepping mechanism includes a base plate 1, a box body 2, a cam support 17 and a ratchet support 20 are fixedly connected to the upper surface of the base plate 1, a ratchet shaft 21 is rotatably connected to the upper end of one side of the ratchet support 20, one end of the ratchet shaft 21 is fixedly connected to a ratchet body 22, a cam shaft 18 is rotatably connected to the cam support 17, one end of the cam shaft 18 is fixedly connected to a large bevel gear 19, a step screw 26 is rotatably connected to one side of the box body 2, one end of the step screw 26 is rotatably connected to a pusher 23, one end of the pusher 23 is provided with an external threaded bearing 24, the outer side of the external threaded bearing 24 conflicts with the outer side of the cam on the cam shaft 18, the upper end of the pusher 23 is rotatably connected to a pawl 25 through the step screw 26, and one end of the pawl 25 is inserted into the tooth groove of the ratchet body 22.

[0022] The other side of the box body 2 is fixedly connected to a box cover 3, and one side of the box cover 3 is rotatably connected to a power input shaft 7 and a driven input shaft 10, one end of the power input shaft 7 is fixedly connected to a large synchronous pulley 8, and one end of the driven input shaft 10 is fixedly connected to a small synchronous pulley 11, and the large synchronous pulley 8 and the small synchronous pulley 11 are connected through a belt 9. The large synchronous pulley 8 can conveniently convert the kinetic energy applied to the turntable 27 to the belt 9, and then input it to the driven input shaft 10 through the belt 9, thereby realizing the output of kinetic energy.

[0023] A turntable 27 is fixedly connected to one end of the power input shaft 7, and a handle 28 is fixedly connected to one side of the turntable 27. The axis of the power input shaft 7 and the axis of the camshaft 18 are arranged on the same axis. Turning the handle 28 can easily drive the turntable 27 to rotate, which is convenient for trainees to operate and improves the training effect of trainees.

[0024] An adjusting support 4 is provided on the upper surface of the base plate 1, and a locking bolt 5 is slidably connected to one side of the adjusting support 4, and an idler wheel 6 is threadedly connected to one end of the locking bolt 5. The outer side of the idler wheel 6 conflicts with the outer side of the belt 9. Two groups of sliding grooves are opened on the upper surface of the base plate 1, and the locking bolts 5 threadedly connected to the adjusting support 4 are slidably connected in both groups of sliding grooves. The idler wheel 6 is used to facilitate the adjustment of the tightness of the belt 9, thereby improving the transmission effect of the belt 9. At the same time, the position of the adjusting support 4 is convenient to move, and the operation is simple.

[0025] The other end of the driven input shaft 10 is rotatably connected to one side of the inner cavity of the box body 2, and a small bevel gear 12 is fixedly connected to the outer side of the driven input shaft 10. The belt 9 drives the small synchronous pulley 11 to rotate and then drives the small bevel gear 12 to rotate through the driven input shaft 10 to realize the input of kinetic energy.

[0026] Two sets of moving shaft bearing supports 13 are symmetrically arranged on the upper surface of the base plate 1, and a transmission shaft 15 is rotatably connected between the two sets of moving shaft bearing supports 13. A large bevel gear 14 meshing with the small bevel gear 12 is arranged in the middle of the outer side of the transmission shaft 15, and the transmission shaft 15 and the driven input shaft 10 are vertically arranged in an offset manner. The moving shaft bearing supports 13 improve the stability of the installation of the transmission shaft 15, thereby improving the stability of the meshing of the small bevel gear 12 and the large bevel gear 14. At the same time, the small bevel gear 12 and the large bevel gear 14 are both arranged in the box body 2 to prevent dust from falling into and causing meshing frustration, thereby improving the service life. At the same time, the box body 2 is transparent, which is convenient for students to observe the meshing condition.

[0027] One end of the transmission shaft 15 is fixedly connected to a small bevel gear 16, which meshes with a large bevel gear 19. The transmission shaft 15 and the camshaft 18 are vertically arranged in an offset manner. The small bevel gear 16 facilitates the output of the kinetic energy of the transmission shaft 15 to the camshaft 18 through the large bevel gear 19, thereby driving the cam to rotate.

[0028] When in use, the handle 28 is turned to drive the turntable 27 to rotate, and the turntable 27 synchronously drives the power input shaft 7 to rotate. The power input shaft 7 drives the belt 9 to mesh with the small synchronous pulley 11 through the large synchronous pulley 8 to rotate, and then the small synchronous pulley 11 drives the driven input shaft 10 to rotate. When the belt 9 is loose, the position of the adjustment support 4 is adjusted to make the idler wheel 6 contact the belt 9 to adjust the tightness. The driven input shaft 10 meshes with the large bevel gear 14 on the transmission shaft 15 through the small bevel gear 12 to complete the power output, thereby driving the transmission shaft 15 to rotate, and the small bevel gear 16 and the cam are connected to the driven input shaft 10 to rotate. The large tapered wheel on the wheel shaft 18 is meshed, so that the cam surface on the camshaft 18 comes into contact with the external threaded bearing 24 on the pusher 23, thereby driving the pusher 23 to swing at a fixed angle around the step screw 26 rotatably connected to the box body 2, and the pusher 23 drives the pawl 25 to push the ratchet body 22 to rotate. During the return stroke, the pusher 23 returns to its previous position, driving the pawl 25 to slide on the tooth back of the ratchet body 22 to the initial position, and repeatedly turning the handle 28 to complete the unidirectional reciprocating rotation of the ratchet body 22, thereby making it easier for trainees to understand the principle of unidirectional rotation of the ratchet and improving the training effect.

[0029] 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.

Claims

1. A ratchet stepping mechanism, comprising a base plate (1), Features: The upper surface of the bottom plate (1) is fixedly connected to a box body (2), a cam support (17) and a ratchet support (20); an upper end of one side of the ratchet support (20) is rotatably connected to a ratchet shaft (21); one end of the ratchet shaft (21) is fixedly connected to a ratchet body (22); a cam shaft (18) is rotatably connected to the cam support (17); one end of the cam shaft (18) is fixedly connected to a large bevel gear (19); and one side of the box body (2) is rotatably connected to the cam support (17). A step screw (26) is connected, one end of the step screw (26) is rotatably connected to a pusher (23), one end of the pusher (23) is provided with an external threaded bearing (24), the outer side of the external threaded bearing (24) contacts the outer side of a cam on the camshaft (18), the upper end of the pusher (23) is rotatably connected to a pawl (25) through the step screw (26), one end of the pawl (25) is inserted into the tooth groove of the ratchet body (22).

2. The ratchet stepping mechanism according to claim 1, Features: The other side of the box body (2) is fixedly connected to a box cover (3), one side of the box cover (3) is rotatably connected to a power input shaft (7) and a driven input shaft (10), one end of the power input shaft (7) is fixedly connected to a large synchronous pulley (8), one end of the driven input shaft (10) is fixedly connected to a small synchronous pulley (11), and the large synchronous pulley (8) and the small synchronous pulley (11) are connected via a belt (9).

3. The ratchet stepping mechanism according to claim 2, Features: One end of the power input shaft (7) is fixedly connected to a turntable (27), one side of the turntable (27) is fixedly connected to a handle (28) along its edge, and the axis of the power input shaft (7) and the axis of the camshaft (18) are both arranged on the same axis.

4. The ratchet stepping mechanism according to claim 3, Features: An adjusting support (4) is arranged on the upper surface of the base plate (1), a locking bolt (5) is slidably connected to one side of the adjusting support (4), an idler wheel (6) is threadedly connected to one end of the locking bolt (5), the outer side of the idler wheel (6) is in contact with the outer side of the belt (9), and two groups of sliding grooves are provided on the upper surface of the base plate (1), and locking bolts (5) threadedly connected to the adjusting support (4) are slidably connected in both groups of sliding grooves.

5. The ratchet stepping mechanism according to claim 3, Features: The other end of the driven input shaft (10) is rotatably connected to one side of the inner cavity of the housing (2), and a small helical gear (12) is fixedly connected to the outer side of the driven input shaft (10).

6. The ratchet stepping mechanism according to claim 5, Features: Two groups of drive shaft bearing supports (13) are symmetrically arranged on the upper surface of the base plate (1), a transmission shaft (15) is rotatably connected between the two groups of drive shaft bearing supports (13), a large bevel gear (14) meshing with a small bevel gear (12) is arranged at the middle of the outer side of the transmission shaft (15), and the transmission shaft (15) and the driven input shaft (10) are vertically arranged in an offset manner.

7. The ratchet stepping mechanism according to claim 6, Features: One end of the transmission shaft (15) is fixedly connected to a small bevel gear (16), the small bevel gear (16) is meshed with a large bevel gear (19), and the transmission shaft (15) and the cam shaft (18) are vertically arranged in an offset manner.

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