CN108071763B

CN108071763B - Intermittent linear power mechanism for driving cam to move by roller

Info

Publication number: CN108071763B
Application number: CN201711209182.3A
Authority: CN
Inventors: 刘涛; 焦满岱; 柴衡山; 孟慧媚; 郝显福; 张海磊
Original assignee: Northwest Research Institute of Mining and Metallurgy
Current assignee: Northwest Research Institute of Mining and Metallurgy
Priority date: 2017-11-27
Filing date: 2017-11-27
Publication date: 2020-09-25
Anticipated expiration: 2037-11-27
Also published as: CN108071763A

Abstract

The invention relates to the field of intermittent power mechanisms, and discloses an intermittent linear power mechanism for pushing a cam to move by a roller, which comprises a driving shaft, a turntable, rollers and a cam, wherein the driving shaft is provided with the turntable; the free end of the cam is connected with the upper end of a turnbuckle, the lower end of the turnbuckle is connected with the front section of a rocker, the front end of the rocker is mounted on the supporting shaft, the rear end of the rocker is lapped above a sliding block, the sliding block is connected with the lower end of a spring, and the upper end of the spring is fixed on a third rack. The invention solves the problem that the cam type intermittent mechanism in the prior art can not directly provide linear power for the actuating mechanism under the condition of a long distance.

Description

Intermittent linear power mechanism for driving cam to move by roller

Technical Field

The invention relates to the field of intermittent power mechanisms, in particular to an intermittent linear power mechanism with a cam pushed by a roller to move.

Background

The traditional cam type intermittent mechanism is a mechanism which pushes a plurality of rollers distributed on a rotating disc through the circular motion of a cam so as to enable the rotating disc to rotate intermittently. When the actuating mechanism is far away from the power source, the traditional cam type intermittent mechanism is used as power, a series of transmission mechanisms are required to be added, unnecessary energy loss is caused, the requirements on the manufacturing and assembling precision of the traditional cam type intermittent mechanism are generally high, certain requirements on the environmental cleanliness are also met, the cost is relatively high, and the cam type intermittent mechanism is generally suitable for special occasions. Therefore, the intermittent mechanism which has simple structure and low cost, can directly provide linear power for the actuating mechanism at a longer distance and is suitable for common occasions is designed, and has important use value and popularization value.

Disclosure of Invention

The invention provides an intermittent linear power mechanism for pushing a cam to move by a roller, aiming at solving the problem that a cam type intermittent mechanism in the prior art cannot directly provide linear power for an actuating mechanism under the condition of a long distance.

The invention adopts the following technical scheme: an intermittent linear power mechanism for pushing a cam to move by a roller comprises a driving shaft, a turntable, rollers and a cam, wherein the turntable is mounted on the driving shaft, a plurality of rollers are uniformly distributed on the turntable along the circumferential direction, a driven shaft is arranged above the turntable, the cam is mounted on the driven shaft, and the rollers are intermittently contacted with the cam in the moving process of the turntable; the free end of the cam is connected with the upper end of a turnbuckle, the lower end of the turnbuckle is connected with the front section of a rocker, the front end of the rocker is mounted on the supporting shaft, the rear end of the rocker is lapped above a sliding block, the sliding block is connected with the lower end of a spring, and the upper end of the spring is fixed on a third rack.

The traditional cam roller mechanism is reversely applied, namely, the roller pushes the cam to move, and the rocker mechanism is matched to realize long-distance linear transmission; a plurality of rollers are circumferentially distributed on the side surface of the disc-shaped part, and the rollers sequentially push the cam, so that intermittent transmission can be realized; the swing of the cam is transmitted to the rocker by adopting the turnbuckle screw, and the initial position of the cam, the initial position of the rocker and the torque conversion proportion can be preset by adjusting the position and the length of the turnbuckle screw.

Drawings

FIG. 1 is a schematic view of the present invention;

description of the symbols

1. The mechanism comprises a first frame 2, a roller 3, a rotary disc 4, a bolt 5, a cam 6, a driven shaft 7, a turnbuckle screw 8, a rocker 9, a spring 10, a sliding block 11, a guide rail 12, a supporting shaft 13, a driving shaft 14, a second frame 15 and a third frame.

Detailed Description

The invention is further described with reference to the following figures and detailed description.

Referring to the attached drawings, the invention provides an intermittent linear power mechanism for pushing a cam to move by rollers, a driving shaft 13 is fixed on a first frame 1, a rotary table 3 is installed on the driving shaft 13, a plurality of rollers 2 are uniformly distributed on the rotary table 3 along the circumferential direction, a driven shaft 6 is fixed on a second frame 14 above the rotary table 3, a cam 5 is installed on the driven shaft 6, the free end of the cam 5 is connected with the upper end of a turnbuckle screw 7, the lower end of the turnbuckle screw 7 is connected with the front section of a rocker 8, the front end of the rocker 8 is installed on a supporting shaft 12, the rear end of the rocker 8 is lapped above a sliding block 10, and the sliding block 10 is. The slide block 10 is arranged in a guide rail 11, and the guide rail 11 is fixed on the machine frame 1. The lower end of the spring 9 is fixed on the upper part of the sliding block 10, the upper end of the spring is fixed on the third frame 15, and the number of the rotors is preferably 10.

Threaded holes are vertically processed at the edges of the rotary table 3, bolts 4 are installed in the threaded holes, and rollers 2 are sleeved in the middle of the bolts 4. The slide 10 is located within the guide rail 11.

In a preferred embodiment, the free end of the cam 5 is connected with the upper end of a turnbuckle 7 through a hinge, and the lower end of the turnbuckle 7 is connected with the front section of a rocker 8 through a hinge.

The working process is as follows:

1. executing: the driving shaft 13 is driven anticlockwise, the rotary disc 3 rotates anticlockwise, and the cam 5 is pushed forwards after the roller 2 rotates to the edge of the cam 5 along with the rotary disc 3. Then, the cam 5 rotates clockwise about the driven shaft 6. Since the free end of the cam 5 is connected to the rocker lever 8 by means of the turnbuckle 7, the rocker lever 8 is rotated clockwise about the bearing shaft 12. At this time, the free section of the cam 5 and the rocker 8 form a double-rocker mechanism. The rear end of the rocker 8 applies downward pressure to the slider 10, and the slider 10 moves downward at a certain speed in the track 11 against the pulling force of the spring 9.

2. Intermittent operation: the turntable (3) continues to rotate, the roller (2) disengages from the cam (5), the pressure acting on the slider (10) disappears, and therefore the slider (10) rapidly returns to the original position upwards under the action of the tension of the spring (9). When the other rollers 2 on the turntable 3 rotate to the edge of the cam 5, the above process is repeated in sequence. This is the basic principle of the present invention to provide intermittent linear power.

The invention applies the traditional cam roller mechanism reversely, namely the roller pushes the cam to move, and then the rocker mechanism is matched, so that the long-distance linear transmission can be realized; the rollers are distributed on the side surface of the disc-shaped part along the circumferential direction, the rollers sequentially push the cam, so that intermittent transmission can be realized, and if the rollers are respectively arranged on the two side surfaces of the disc-shaped part, intermittent linear power with certain correlation can be simultaneously provided for the two actuating mechanisms; the swing of the cam is transmitted to the rocker by adopting the turnbuckle, and the initial position of the cam, the initial position of the rocker and the torque conversion proportion can be preset by adjusting the position and the length of the turnbuckle; the spring is used as the return power of the actuating element, so that the intermittent time can be fully prolonged, and the established function can be better realized. The invention can provide different speed forms for the executing part by changing the shape of the cam, and can change the motion track of the executing part by changing the guide rail form. The roller can be a common roller bearing, and is low in price and easy to replace.

Claims

1. An intermittent linear power mechanism for pushing a cam to move by a roller comprises a driving shaft (13), a rotary table (3), rollers (2) and a cam (5), and is characterized in that the driving shaft (13) is provided with the rotary table (3), a plurality of rollers (2) are uniformly distributed on the rotary table (3) along the circumferential direction, a driven shaft (6) is arranged above the rotary table (3), the cam (5) is arranged on the driven shaft (6), and the rollers (2) are intermittently contacted with the cam (5) in the moving process of the rotary table (3); the free end of the cam (5) is connected with the upper end of a turnbuckle (7), the lower end of the turnbuckle (7) is connected with the front section of a rocker (8), the front end of the rocker (8) is installed on a supporting shaft (12), the rear end of the rocker is lapped above a sliding block (10), the sliding block (10) is connected with the lower end of a spring (9), and the upper end of the spring (9) is fixed on a third rack (15).