CN105751007A - Push type indexing mechanism - Google Patents

Abstract

The invention discloses a pushing type indexing mechanism, which comprises an indexing mechanism body, a ratchet mounted on the indexing mechanism body, a movable cylinder and a spring lifting block; the ratchet is fixedly connected with the movable rod of the movable cylinder, and Moving under the drive of the movable rod, a plurality of pulleys are uniformly installed on the ratchet along the circumference; the top of the spring lifting block is against the pulley, and the up and down movement of the spring lifting block is controlled by the extrusion of the pulley to the spring lifting block. The present invention adopts the push-pull action of the conventional movable cylinder to cooperate with the ratchet with the pulley to complete a rotary indexing, and the ratchet is oriented to stop the rotation through the ratchet, so that the ratchet can only rotate clockwise; number, and one stroke of the movable cylinder matched with the number of pulleys, so that the rotation angle of each indexing ratchet can be easily and conveniently changed; the invention has simple structure, low machining cost and more convenient position control.

Description

push indexing mechanism

technical field

The invention relates to a push-type indexing mechanism, which belongs to the technical field of indexing mechanisms.

Background technique

At present, in some fixture design structures that require indexing processing, many of them use manual or electric indexing, and the structure is also commonly used in the fixed type, ratchet type, gear or worm gear type. Among these indexing transmission structures, the manual structure has low efficiency and low precision; the electric structure has a large position control cost and a long machining cycle.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a push-type indexing mechanism with simple structure and simple operation.

In order to solve the above-mentioned technical problems, the technical solution of the present invention is: a push-type indexing mechanism, which includes an indexing mechanism body, and a ratchet, a movable cylinder and a spring lifting block installed on the indexing mechanism body;

The ratchet is fixedly connected with the movable rod of the movable cylinder, and moves under the drive of the movable rod, and a plurality of pulleys are uniformly installed on the ratchet along the circumference;

The top of the spring lifting block is against the pulley, and the up and down movement of the spring lifting block is controlled by the extrusion of the spring lifting block by the pulley.

Further, in order to prevent the reverse rotation of the ratchet, a pawl for preventing the reverse rotation of the ratchet is also installed on the body of the indexing mechanism.

Further provide a connection structure between the ratchet and the movable cylinder, the indexing mechanism body is provided with a guide rail groove, the ratchet is slidably installed on the guide rail groove through a slider, the slider is connected with the movable rod of the movable cylinder, and Driven by the movable rod, it moves left and right along the guide rail groove, and the ratchet is also installed on the above-mentioned slide block.

Furthermore, in order to facilitate the connection with the workpiece to be clamped, an output shaft for outputting the movement of the ratchet is fixedly installed on the central axis of the ratchet.

Further provide a specific structure of the spring lifting block, the spring lifting block includes a lifting block, a moving guide rod and a spring;

The lifting block is fixedly connected to the top of the moving guide rod;

The lower end of the spring abuts against the body of the indexing mechanism, and the upper end abuts against the moving guide rod.

Further, in order to prevent the lifting block from rotating and guide it, the indexing mechanism body is provided with a detent pin, and one end of the lifting block is provided with a through hole matched with the detent pin, and the detent pin is movably inserted in the above-mentioned through hole.

Further, the body of the indexing mechanism is provided with a through hole for passing through and guiding the moving guide rod, and a guide sleeve is fixed in the through hole.

Further, the ratchet is fixed on the slider through axial screws, and the pulley is fixed on the ratchet through axial screws.

Further, there are four pulleys, and the central angle corresponding to the arc where two adjacent pulleys are located is 90°.

Further, the movable rod is an air cylinder.

After adopting the above technical scheme, the present invention has the following beneficial effects:

1) The push-pull action of the conventional movable cylinder is used to cooperate with the ratchet wheel with a pulley to complete a rotary index, and the ratchet wheel is oriented to stop rotation through the ratchet, so that the ratchet wheel can only rotate clockwise;

2) The present invention can simply and conveniently change the rotation angle of each indexing ratchet by changing the number of pulleys and one stroke of the movable cylinder matched with the number of pulleys;

3) The present invention has simple structure, low machining cost and more convenient position control.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the A-A sectional enlarged view of Fig. 1;

In the figure, 1. movable cylinder, 2. slide block, 3. ratchet, 4. pawl, 5. indexing mechanism body, 6. spring, 7. moving guide rod, 8. lifting block, 9. stop pin, 10, shaft screw, 11, output shaft, 13, guide sleeve, 14, pulley.

detailed description

In order to make the content of the present invention more clearly understood, the present invention will be further described in detail below based on specific embodiments and in conjunction with the accompanying drawings.

As shown in Figure 1 and Figure 2, a push-type indexing mechanism includes an indexing mechanism body 5, and a ratchet 3, a movable cylinder 1 and a spring lifting block installed on the indexing mechanism body 5;

The ratchet 3 is fixedly connected with the movable rod of the movable cylinder 1, and moves under the drive of the movable rod, and four pulleys 14 are evenly installed along the circumference on the ratchet 3;

The top of the spring lifting block is against the pulley 14, and the extrusion of the spring lifting block by the pulley 14 moves up and down of the spring lifting block.

Preferably, as shown in FIG. 1 , a pawl 4 for preventing the reverse rotation of the ratchet 3 is installed on the body 5 of the indexing mechanism, and the pawl 4 prevents the ratchet from rotating directionally, so that the ratchet 3 can only rotate clockwise.

Preferably, the indexing mechanism body 5 is provided with a guide rail groove, and the ratchet 3 is slidably installed on the guide rail groove by a slide block 2. The slide block 2 is connected with the movable rod of the movable cylinder 1, and is driven along the guide rail groove Move left and right, ratchet 4 is also installed on the above-mentioned slide block 2.

Optionally, as shown in Figure 2, the central axis of the ratchet 3 is fixedly installed with an output shaft 11 for outputting the action of the ratchet, the output shaft 11 is positioned on the ratchet 3 and fixed together with screws, and the output shaft 11 is installed to be clamped The workpiece drives the workpiece to be clamped to rotate together.

Preferably, as shown in Figure 1 and Figure 2, the spring lifting block includes a lifting block 8, a moving guide rod 7 and a spring 6;

The lifting block 8 is fixedly connected to the top of the moving guide rod 7;

The lower end of the spring 6 abuts on the index mechanism body 5 , and the upper end abuts on the moving guide rod 7 .

Further, the indexing mechanism body 5 is provided with a detent pin 9, and one end of the lifting block 8 has a through hole matched with the detent pin 9, and the detent pin 9 is movably inserted in the above-mentioned through hole, and the detent pin 9 It is used to prevent the lifting block 8 from rotating and guide the lifting block 8 so that the lifting block 8 can only move in the vertical direction.

Optionally, the indexing mechanism body 5 is provided with a through hole for passing through the moving guide rod 7 and guiding the moving guide rod 7, and a guide sleeve 13 is fixed in the through hole for reducing the distance between the moving guide rod 7 and the indexing. The friction of mechanism body 5.

Specifically, as shown in FIG. 2 , the ratchet 3 is fixed on the slider 2 through the axial screw 10 , and the pulley 14 is fixed on the ratchet 3 through the axial screw 10 .

Further, there are four pulleys 14, which are distributed as pulley a, pulley d, pulley b, and pulley e. The central angle corresponding to the circular arc where two adjacent pulleys 14 are located is 90°, so that each time the ratchet 3 completes the indexing, Rotate 90°; Of course, the pulley 14 can also be provided with five or six or eight according to actual needs, by changing the number of pulleys 14, and a stroke of the movable cylinder matched with the number of pulleys to change each indexing Rotation angle of ratchet 3.

The movable rod 1 is an air cylinder, and certainly can be a hydraulic cylinder.

The working principle of the present invention is as follows:

As shown in Figure 1, when the movable rod of the cylinder 1 is stretched out, the slider 2 and the ratchet 3 on the slider 2 are pushed to move to the left, and the pulley d on the ratchet 3 squeezes the lifting block 8, so that the lifting block 8 is always at the Below the pulley d, until the pulley d is out of contact with the lifting block 8, when the pulley d is separated from the lifting block 8, the lifting block 8 is lifted up by a certain distance by moving the guide rod 7 under the action of the spring 6, and the pulley d is stuck in the lifting block. block 8 left;

When the moving rod of the cylinder 1 is retracted, the moving rod pulls the slider 2 and the ratchet 3 on the slider 2 to move to the right, the pulley d on the ratchet 3 is restricted by the lifting block 8 and cannot move to the right with the ratchet 3, the pulley d It is stuck on the left side of the lifting block 8, so that the ratchet 3 and the output shaft 11 fixed on it rotate clockwise until the pulley b presses on the lifting block 8 and squeezes the lifting block 8 to gradually descend. The movable rod continues to retract, and the pulley d begins to slide on the lifting block 8, so that the pulley d is released from the restriction, the ratchet 3 and the output shaft 11 no longer rotate, and they move to the right along the upper surface of the lifting block 8 to stop, when the pulley d reaches At the position of a, the pulley b reaches the position of d, and one indexing is completed.

The present invention adopts the push-pull action of the conventional movable cylinder 1 to cooperate with the ratchet 3 with the pulley 14 to complete a rotary index, and the ratchet is oriented to stop rotation through the ratchet, so that the ratchet 3 can only rotate clockwise; the present invention can pass Change the number of pulleys 14 and one stroke of the movable cylinder matched with the number of pulleys, thereby simply and conveniently changing the rotation angle of each indexing ratchet 3; the present invention has simple structure, low machining cost and more convenient position control .

The specific embodiments described above have further described the technical problems, technical solutions and beneficial effects solved by the present invention in detail. It should be understood that the above descriptions are only specific embodiments of the present invention and are not intended to limit the present invention. Inventions, any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. A push-type indexing mechanism, characterized in that: it comprises an indexing mechanism body (5), and a ratchet (3), a movable cylinder (1) and a spring lifting block installed on the indexing mechanism body (5) ; The ratchet (3) is fixedly connected with the movable rod of the movable cylinder (1), and moves under the drive of the movable rod, and a plurality of pulleys (14) are uniformly installed along the circumference of the ratchet (3); The top of the spring lifting block is against the pulley (14), and the up and down movement of the spring lifting block is controlled by the extrusion of the spring lifting block by the pulley (14). 2. The push-type indexing mechanism according to claim 1, characterized in that: the indexing mechanism body (5) is further equipped with a ratchet (4) for preventing the ratchet (3) from rotating in reverse. 3. The push-type indexing mechanism according to claim 2, characterized in that: the indexing mechanism body (5) is provided with guide rail grooves, and the ratchet (3) is slidably installed through a slider (2) On the guide rail groove, the slider (2) is connected with the movable rod of the movable cylinder (1), and moves left and right along the guide rail groove under the drive of the movable rod, and the pawl (4) is also installed on the above slider (2) superior. 4. The push-type indexing mechanism according to claim 3, characterized in that: the central axis of the ratchet (3) is fixedly installed with an output shaft (11) for outputting the movement of the ratchet. 5. The push-type indexing mechanism according to any one of claims 1 to 4, characterized in that: the spring lifting block includes a lifting block (8), a moving guide rod (7) and a spring (6); The lifting block (8) is fixedly connected to the top of the moving guide rod (7); The lower end of the spring (6) abuts on the indexing mechanism body (5), and the upper end abuts on the moving guide rod (7). 6. The push-type indexing mechanism according to claim 5, characterized in that: the indexing mechanism body (5) is provided with a detent pin (9), and one end of the lifting block (8) is provided with a stop pin. The through hole that revolving pin (9) cooperates, and anti-rotating pin (9) is movably inserted in above-mentioned through hole. 7. The push-type indexing mechanism according to claim 6, characterized in that: said indexing mechanism body (5) is provided with an opening for passing through the moving guide rod (7) and guiding the moving guide rod (7). The through hole is fixed with a guide sleeve (13) in the through hole. 8. The push-type indexing mechanism according to claim 1, characterized in that: the ratchet (3) is fixed on the slider (2) by an axial screw (10), and the pulley (14) is Bit screw (10) is fixed on the ratchet (3). 9. The push-type indexing mechanism according to any one of claims 1 to 4, characterized in that: the pulleys (14) are provided with four, and the centers of the arcs where two adjacent pulleys (14) are located correspond to The angle is 90°. 10. The push type indexing mechanism according to any one of claims 1 to 4, characterized in that: the movable rod (1) is an air cylinder.