CN203631009U - Contour line generation demonstration device for disc cam of pointed translating follower - Google Patents

Abstract

The utility model discloses a demonstration device for generating a profile of a disc-shaped cam of a pointed direct-moving follower, which includes a frame, a moving rack is arranged in the upper frame of the frame, a sliding groove is arranged in the moving rack, and a roller is arranged in the sliding groove , the rollers are connected to the upper frame of the rack, there is a drawing groove in the upper frame of the rack corresponding to the middle part of the upper end of the moving rack, and there is a displacement curve template on one side of the drawing groove, and a gear is provided on the upper frame of the rack corresponding to the middle part of the lower end of the moving rack. There is a movable crossbeam between the left and right frames of the frame, and there is a mounting and fixing groove in the movable crossbeam. The gear is connected to the upper end of the flexible transmission system through a rotating shaft, and the lower end of the flexible transmission system is connected to another rotating shaft. The rotating shaft passes through the installation and fixed. The groove is connected with the drawing disk. The profile generation demonstration device of the utility model simulates the rotation of the disc cam with the drawing disk, simulates the movement of the pointed direct-moving follower with the displacement curve template, and sets the structural size of the cam with a flexible transmission system to generate the profile of the cam. More intuitive and vivid.

Description

Demonstration device for profile generation of disc cam with pointed linear follower

technical field

The utility model belongs to the technical field of teaching appliances, and in particular relates to a device for generating and demonstrating a profile of a disc cam of a pointed direct-moving follower.

Background technique

The principle of mechanics is an important basic course for mechanical majors, which must involve the cam mechanism. Teachers often need to make the following choices when teaching the design of the cam contour: (1) First use the analytical method to directly obtain the coordinates of the cam contour, and then It is processed by CNC machine tools, but the establishment of coordinate equations is difficult to break away from the generation principle of the cam profile; (2) It is used to draw the cam profile using the graphic method. Although this method is simple and intuitive, it can profoundly express the cam angle and the follower The movement relationship between the displacements, but the movement must be reversed, that is, the cam is used as the frame, and the original frame is rotated in the opposite direction. Although it will increase the difficulty of understanding, it has evolved the principle of generating the contour line of the graph. Due to the lack of suitable Teaching aids are used to assist teaching, so it is necessary to explore new methods that can help students better grasp the cam profile generation in a real, visual and manipulable way.

Utility model content

The purpose of the utility model is to provide a device for demonstrating the profile generation of the disc cam of the pointed direct-moving follower, which realizes the generation of the cam profile by means of dynamic demonstration.

The technical scheme adopted by the utility model is that the demonstration device for generating the profile of the disc-shaped cam of the pointed direct-moving follower includes a frame, the frame is a rectangular frame, and the middle part of the upper frame of the frame is horizontally provided with a moving rack , the middle part of the moving rack is provided with a sliding groove, and a pair of rollers are arranged in the sliding groove, and the pair of rollers are respectively connected with the upper frame of the frame through a rotating pair, and a scale plate is arranged on the moving rack at the upper part of the sliding groove, and the moving rack A drawing slot is arranged vertically in the upper frame of the rack corresponding to the middle part of the upper end, a displacement curve template is arranged on one side of the drawing slot, teeth are arranged at the lower end of the moving rack, and a gear is arranged on the upper frame of the rack corresponding to the middle part of the lower end of the moving rack. A movable crossbeam is arranged between the left and right frames of the frame, and the middle part of the movable crossbeam is provided with an installation fixing groove. The gear is connected with the upper end of the flexible transmission system through the first rotating shaft, and the lower end of the flexible transmission system is connected with the second rotating shaft. One end is connected, and the second rotating shaft passes through the installation fixing groove and is connected with the drawing disk.

The utility model is also characterized in that,

A machine base is respectively arranged at two bottom corners of the lower frame of the rack.

The center of the drawing disk is provided with a corner scale plate.

The movable crossbeam includes a horizontally arranged crossbeam, and a movable locking device is respectively arranged at both ends of the crossbeam, and the two ends of the movable crossbeam are respectively connected with the left and right frame of the frame through the movable locking device.

The flexible transmission system includes an upper link and a lower link. The lower end of the upper link and the upper end of the lower link are connected to a toothed pulley through a rotating pair. The upper end of the upper link and the lower end of the lower link are respectively A toothed pulley is connected through the rotating pair, the toothed pulley at the upper end of the upper link is connected with the first rotating shaft, the lower end of the lower connecting rod is connected with the second rotating shaft, and one of the three toothed pulleys are connected by a toothed belt.

The lower end of the moving rack is provided with teeth meshing with the gear.

A pen tip is arranged in the drawing groove.

The beneficial effects of the utility model are:

(1) The demonstration device for generating the profile of the disc-shaped cam of the pointed direct-acting follower of the utility model can establish the relationship between the cam rotation angle and the displacement of the follower in an intuitive way, and deeply understand the decisive role of the displacement curve in the design of the cam , with the help of the point of contact between the cam and the follower, by observing and demonstrating the dynamic generation process of the cam profile, a deep understanding of the principle of the graph profile controlling the movement of the follower, and on this basis, learning and researching the various aspects of the cam class processing method.

(2) The utility model’s profile generation demonstration device of the pointed direct-moving follower disc cam can inspire students to think and practice, make the abstract and complex geometric relationship of motion intuitive and simple, and can reduce the teacher’s need to explain the outline of the diagram. Difficulty of design.

(3) The demonstration device for generating the profile of the disc-shaped cam of the pointed direct-acting follower of the utility model can also be used as an example for training students to design motion schemes, and it is a very good auxiliary tool for mastering the combination skills of various mechanisms. teaching aids.

Description of drawings

Fig. 1 is a structural diagram of a demonstration device for generating a profile of a disc cam of a pointed direct-acting follower of the present invention.

In the figure, 1. Drawing plate, 2. Movable beam, 3. Flexible transmission system, 4. Gear, 5. Moving rack, 6. Displacement curve template, 7. Rack, 8. Base, 9. Angle scale Plate, 10. Mobile locking device, 11. Installation and fixing groove, 12. Toothed belt, 13. Toothed belt wheel, 14. Upper link, 15. Sliding groove, 16. Roller, 17. Template scale, 18. Drawing slot, 19. Lower link.

Detailed ways

The utility model will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The profile generation demonstration device of the pointed direct-acting follower disk cam of the utility model has a structure as shown in Figure 1, including a frame 7, which is a rectangular frame, and the middle part of the upper frame of the frame 7 is horizontal A moving rack 5 is provided, and the middle part of the moving rack 5 is provided with a sliding groove 15, and a pair of rollers 16 are arranged in the sliding groove 15, and a pair of rollers 16 are respectively connected with the upper frame of the frame 7 through a rotating pair, and the upper part of the sliding groove 15 Scale plate 17 is arranged on the movable rack 5, and drawing groove 18 is arranged vertically in the corresponding frame 7 upper frame of moving rack 5 upper middle part, and drawing groove 18 one side is provided with displacement curve template 6, and moving rack 5 The lower end is provided with teeth, and a gear 4 is provided on the frame 7 upper frame corresponding to the middle part of the lower end of the movable rack 5. A movable crossbeam 2 is provided between the left and right frames of the frame 7, and the middle part of the movable crossbeam 2 is provided with a mounting bracket. Fixed groove 11, gear 4 is connected with the upper end of flexible transmission system 3 through the first rotating shaft, the lower end of flexible transmission system 3 is connected with one end of the second rotating shaft, and the second rotating shaft passes through installation fixing groove 11 and is connected with drawing disk 1.

A rectangular window is arranged in the frame 7 , and a machine base 8 is respectively arranged at two bottom corners of the lower frame of the frame 7 .

The center of the drawing disk 1 is provided with a corner scale plate 9 .

The movable crossbeam 2 includes a horizontally arranged crossbeam, and a mobile locking device 10 is respectively arranged at both ends of the crossbeam. The mobile locking device 10 is installed on both ends of the movable crossbeam 2, so that the movable crossbeam 2 can move up and down along the left and right frames of the frame 7, and lock the crossbeam on the frame 7 at a suitable position. And the fixing groove 11 is used to connect and fix the second rotating shaft connected with the drawing disk 1, and the position adjustment of the drawing disk 1 can be realized by changing the fixed position.

The flexible transmission system 3 includes an upper connecting rod 14 and a lower connecting rod 19 connected up and down, the lower end of the upper connecting rod 14 and the upper end of the lower connecting rod 19 are connected with a toothed pulley 13 through a rotating pair, To form a telescopic open chain, the upper end of the upper connecting rod 14 and the lower end of the lower connecting rod 19 are respectively connected to a toothed pulley 13 through a rotating pair, and the toothed pulley 13 at the upper end of the upper connecting rod 14 passes through the first rotating shaft and the gear 4 connected, the toothed belt pulley 13 at the lower end of the lower connecting rod 19 is connected with the second rotating shaft, and the three toothed belt pulleys 13 are connected by the toothed belt 12 to form a two-stage toothed belt transmission mechanism. Wherein, a toothed pulley 13 is respectively housed between the two ends of the upper connecting rod 14 and the lower connecting rod 19, between the upper connecting rod 14 and the lower connecting rod 19, and forms a toothed belt mechanism together with the toothed belt 12. The connecting rod 14 and the lower connecting rod 19 form an open chain, so that the flexible transmission system 3 can not only be transmitted through two serial toothed belt mechanisms, but also can be adjusted in position through the open chain formed by the upper connecting rod 14 and the lower connecting rod 19 .

The lower end of the moving rack 5 is provided with teeth meshed with the gear 4 .

The slide groove 15 and a pair of rollers 16 arranged in the frame 7 form a moving pair, which can realize the movement of the mobile rack 5 relative to the frame 7, and the movement of the template scale 17 relative to the drawing groove 18 corresponds to the rotation angle of the cam. Groove 18 is used for putting in nib, can draw figure outline on drawing disc 1.

In the profile generation demonstration device of the pointed direct-moving follower disk cam of the utility model, the corner scale plate 9 can fix the circular drawing paper on the drawing disk 1, and can read the rotation angle when the drawing disk 1 is rotated; The drawing board 1 is connected to the lower end of the flexible transmission system 3 through the second rotating shaft, and is fixed at a suitable position of the movable crossbeam 2. The movable crossbeam 2 can move along the frame of the frame 7 and can be connected with the frame 7 at a suitable position. As a whole, the flexible transmission system 3 is connected to the gear 4 at the upper end with the first rotating shaft and fixed on the frame 7, the moving rack 5 fixes the displacement curve template 6, and meshes with the gear 4 to move relative to the frame 7. Put a pen in the drawing slot 18 on the frame 7, and close to the displacement curve template 6, and rotate the drawing disk 1 to draw the desired cam profile.

Because the diameters of each toothed pulley 13 in the flexible transmission system 3 are the same, so the transmission ratio of the flexible transmission system 3 is 1, the drawing disk 1 and the gear 4 that are connected with the flexible transmission system 3 must have the same rotation angle, according to the circumference of the gear 4 Carry out 360 ° of scales to the displacement curve template 6, that is, the template scale 17, and a strict corresponding relationship can be established between the rotation angle on the drawing board 1 and the displacement on the displacement curve template 6, that is, the scale on the corner scale plate 9 and the template scale 17 One to one correspondence. The scale on the corner scale plate 9 can be read relative to the mounting groove 11, and the template scale 17 should be read relative to the drawing groove 18.

The specific operation process of the utility model for the profile generation demonstration device of the pointed direct-moving follower disc cam is as follows: first fix the suitable circular drawing paper on the drawing disk 1 with the corner scale plate 9, and then connect the drawing disk 1 The second rotating shaft is fixed in the installation and fixing groove 11 of the movable crossbeam 2, and is connected with the toothed pulley 13 at the lower end of the flexible transmission system 3, and the position of the second rotating shaft connected between the movable crossbeam 2 and the drawing disk 1 is adjusted. , you can set the required base circle radius and offset distance, select the appropriate displacement curve template 6, fix it on the moving rack 5 according to the template scale 17, and put a pen in the drawing groove 18 on the frame 7, the pen tip must be close to Tighten the displacement curve template 6, and rotate the drawing disk 1 to draw the desired cam profile on the drawing paper.

Claims (7)

1. The demonstration device for generating the profile of the disc-shaped cam of the pointed linear follower, which is characterized in that it includes a frame (7), the frame (7) is a rectangular frame, and the upper part of the frame (7) A moving rack (5) is horizontally arranged in the middle of the frame, and a sliding groove (15) is arranged in the middle of the moving rack (5). A pair of rollers (16) are arranged in the sliding groove (15). A pair of rollers (16) are respectively connected to the upper frame of the frame (7) through the rotating pair, and the moving rack (5) on the upper part of the sliding groove (15) is provided with a scale plate (17), and the moving rack ( 5) A drawing slot (18) is vertically provided in the upper frame of the upper frame (7) corresponding to the middle part of the upper end, and a displacement curve template (6) is provided on one side of the drawing slot (18), and the moving rack (5) The lower end is provided with teeth, and the upper frame of the frame (7) corresponding to the middle part of the lower end of the mobile rack (5) is provided with a gear (4), and a movable The beam (2), the middle part of the movable beam (2) is provided with a fixing groove (11), the gear (4) is connected with the upper end of the flexible transmission system (3) through the first rotating shaft, and the flexible transmission The lower end of the system (3) is connected to one end of the second rotating shaft, and the second rotating shaft is connected to the drawing disk (1) through the installation fixing groove (11). 2. The demonstration device for generating the profile of the pointed linear follower disc cam according to claim 1, characterized in that, the two bottom corners of the lower frame of the frame (7) are respectively provided with a base ( 8). 3. The demonstration device for generating a profile of a disc cam of a pointed linear follower according to claim 1, characterized in that a rotation angle scale plate (9) is arranged in the center of the drawing disk (1). 4. The demonstration device for generating the profile of the pointed linear follower disc cam according to claim 1, characterized in that, the movable beam (2) includes a horizontally arranged beam, and the two beams of the beam are A mobile locking device (10) is provided at each end, and the two ends of the movable beam (2) are respectively connected with the left and right frames of the frame (7) through the mobile locking device (10). 5. The demonstration device for generating the profile of the pointed linear follower disk cam according to claim 1, characterized in that the flexible transmission system (3) includes an upper link (14) and a lower link (19), the lower end of the upper link (14) and the upper end of the lower link (19) are connected to a toothed pulley (13) through a rotating pair, and the upper link (14) The upper end and the lower end of the lower connecting rod (19) are respectively connected with a toothed pulley (13) through a rotating pair, and the toothed pulley (13) at the upper end of the upper connecting rod (14) is connected with the first rotating shaft connection, the toothed pulley (13) at the lower end of the lower link (19) is connected to the second rotating shaft, and the three toothed pulleys (13) are connected by a toothed belt (12). 6. The demonstration device for generating the profile of the pointed linear follower disc cam according to claim 1, characterized in that, the lower end of the moving rack (5) is provided with a tooth that meshes with the gear (4) . 7 . The demonstration device for generating a profile of a pointed linear follower disk cam according to claim 1 , wherein a pen tip is arranged in the drawing groove ( 18 ). 8 .

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