CN101986404A

CN101986404A - Electric rotating limiting mechanism

Info

Publication number: CN101986404A
Application number: CN 201010543495
Authority: CN
Inventors: 田学光; 张德龙; 贺甲
Original assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Current assignee: Changchun Institute of Optics Fine Mechanics and Physics of CAS
Priority date: 2010-11-15
Filing date: 2010-11-15
Publication date: 2011-03-16
Anticipated expiration: 2030-11-15
Also published as: CN101986404B

Abstract

The invention relates to an electric rotating limiting mechanism. The electric rotating limiting mechanism comprises two electric limiting switches and two separation blades which are fixed on the circumference of a substrate, and two stirring forks fixed on a rotating shaft, wherein the stirring fork consists of a fixed arm, a swinging arm, a pin shaft and an extension spring. In the clockwise rotation of the rotating shaft, when the first stirring fork collides with a contact terminal of the second electric limiting switch, a return circuit is disconnected to realize positive 180-degree limiting; and under the action of the first separation blade, the second swinging arm rotates an angle relative to the second fixed arm. In the counterclockwise rotation of the rotating shaft, when the second stirring fork collides with the contact terminal of the first electric limiting switch, the return circuit is disconnected to realize negative 180-degree limiting; and under the action of the second separation blade, the first swinging arm rotates the angle relative to the first fixed arm. As the swinging arms of the stirring forks can rotate uniaxially relative to the corresponding fixed arms, the electric rotating limiting mechanism realizes the limiting of the rotating shaft in the range of more than or equal to 360 degrees.

Description

Rotate electric position-limit mechanism

Technical field

The present invention relates to the electric position-limit mechanism of a kind of rotation.

Background technology

Rotary bodies such as turntable all need the rotational angle restriction within the specific limits usually, therefore need electric position-limit mechanism and mechanical position limitation mechanism to be rotated spacing.Common simple and reliable electric position-limit mechanism is that two electric limit switches are installed on the circumference of rotary table base, from the contact of forward and opposite direction collisions electricity limit switch corresponding circuit is disconnected respectively by the shift fork that is connected on the rotating shaft, realizes spacing.Because the contact and the shift fork of electric limit switch have taken certain space angle, make the spacing scope of electric position-limit mechanism be less than 360 °.Generally speaking, rotary bodies such as turntable adopt above-mentioned simple electric position-limit mechanism just can meet the demands, and equal 360 ° and require the spacing scope of electric position-limit mechanism to be greater than under special occasions.

Summary of the invention

The technical problem to be solved in the present invention provides a kind of spacing scope more than or equal to the electric position-limit mechanism of 360 ° rotation.

In order to solve the problems of the technologies described above, the electric position-limit mechanism of rotation of the present invention comprises first, second electric limit switch, first, second catch, first, second shift fork; First, second electric limit switch and first, second catch are fixed on the circumference of rotary table base; First, second shift fork is fixed on the excircle of rotating shaft; Described first shift fork and the second electric limit switch, second catch are positioned at sustained height; Second shift fork and the first electric limit switch, first catch are positioned at sustained height; When 0 ° of position, first shift fork and the first electric limit switch, first catch stagger up and down, and second shift fork and the second electric limit switch, second catch stagger up and down; First shift fork is made up of first fixed arm, first swing arm, first bearing pin and first extension spring; One end of first extension spring is fixedlyed connected with first swing arm, the other end is fixedlyed connected with first fixed arm, the length of first swing arm is greater than the distance of thoughtful first catch of the cylindrical of rotating shaft, the length of first fixed arm is less than the distance of thoughtful first catch of the cylindrical of rotating shaft, first swing arm can be around first bearing pin with respect to the first fixed arm folk prescription to rotation; Second shift fork is made up of second fixed arm, second swing arm, second bearing pin and second extension spring; One end of second extension spring is fixedlyed connected with second swing arm, the other end is fixedlyed connected with second fixed arm, the length of second swing arm is greater than the distance of thoughtful second catch of the cylindrical of rotating shaft, and the length of second fixed arm is less than the distance of thoughtful second catch of the cylindrical of rotating shaft; Second swing arm can around second bearing pin with respect to the second fixed arm folk prescription to rotation.

Rotating shaft clockwise rotates, and when first shift fork collided the contact of the second electric limit switch, cutoff circuit realized that 180 ° of forwards are spacing; At this moment, do not relatively rotate between first swing arm and first fixed arm, because the effect of first catch, relative second fixed arm of second swing arm turns over an angle.Rotating shaft rotates counterclockwise, when second shift fork collides the contact of the first electric limit switch, cutoff circuit, realize reverse 180 ° spacing; At this moment, do not relatively rotate between second swing arm and second fixed arm, because the effect of second catch, relative first fixed arm of first swing arm turns over an angle.In this process, since the swing arm of shift fork can be around bearing pin with respect to the fixed arm folk prescription to rotation, the angle of rotating is more than or equal to electric limit switch, catch and shift fork occupation space angle, the angle that rotating shaft rotates is more than or equal to 360 °, the scope that realized spacing more than or equal to 360 °.

Description of drawings

Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.

Fig. 1 is the electric position-limit mechanism stereogram of rotation of the present invention.

Fig. 2 is the stereogram of first shift fork, second shift fork.

Fig. 3 a, 3b are front view and the vertical view of the electric position-limit mechanism of rotation when 0 ° of position.

Fig. 4 a, 4b are front view and the vertical view of the electric position-limit mechanism of rotation when+180 ° of positions.

Fig. 5 a, 5b are front view and the vertical view of the electric position-limit mechanism of rotation when-180 ° of positions.

Embodiment

As shown in Figure 1, 2, the electric position-limit mechanism of rotation of the present invention comprises first, second

electric limit switch

11,21, first,

second catch

13,23, first,

second shift fork

12,22; First, second

electric limit switch

11,21 and first,

second catch

13,23 are fixed on the circumference of rotary table base 2; First,

second shift fork

12,22 is fixed on the excircle of rotating shaft 1, can rotate along with rotating shaft 1; Described first shift fork 12 and the second electric limit switch 21, second catch 23 are positioned at sustained height; Second shift fork 22 and the first electric limit switch 11, first catch 13 are positioned at sustained height; First shift fork 12 is made up of first fixed arm 122, first swing arm 121, first bearing pin 125 and first extension spring 124; One end of first extension spring 124 is fixedlyed connected with first swing arm 121, the other end is fixedlyed connected with first fixed arm 122, first swing arm 121 can clockwise rotate with respect to first fixed arm 122 around first bearing pin 125 under the effect of second catch 23, be subjected to the pulling force restriction of first extension spring 124 simultaneously, angle of rotation is less than 90 °; Second shift fork 22 is made up of second fixed arm 222, second swing arm 221, second bearing pin 225 and second extension spring 224; One end of second extension spring 224 is fixedlyed connected with second swing arm 221, the other end is fixedlyed connected with second fixed arm 222, second swing arm 221 can rotate counterclockwise with respect to second fixed arm 222 around second bearing pin 225 under the effect of first catch 13, be subjected to the pulling force restriction of second extension spring 224 simultaneously, angle of rotation is less than 90 °.

The length of described first swing arm 121 is greater than the distance of thoughtful first catch of the cylindrical of rotating shaft 1 13, the first electric limit switch 11, and the length of first fixed arm 122 is less than the distance of thoughtful first catch of the cylindrical of rotating shaft 1 23, the first electric limit switch 11; The length of second swing arm 221 is greater than the distance of thoughtful second catch of the cylindrical of rotating shaft 1 23, the second electric limit switch 21, and the length of second fixed arm 222 is less than the distance of thoughtful second catch of the cylindrical of rotating shaft 1 23, the second electric limit switch 21; The upper surface of first fixed arm 122 has first projection 123, and when first swing arm 121 and first fixed arm 122 did not relatively rotate, because the effect of first extension spring 124, first projection 123 was close to the inboard of first swing arm 121; The upper surface of second fixed arm 222 has second projection 223, and when second swing arm 221 and second fixed arm 222 did not relatively rotate, because the effect of second extension spring 224, second projection 223 was close to the inboard of second swing arm 221.

Shown in Fig. 3 a, 3b, the first electric limit switch 11, first catch 13 and second shift fork 22 are positioned at sustained height; The second electric limit switch 21, second catch 23 and first shift fork 12 are positioned at sustained height.In the time of 0 ° of position, first shift fork 12 and the first electric limit switch 11, first catch 13 stagger up and down, and second shift fork 22 and the second electric limit switch 21, second catch 23 stagger up and down.Angle between the lateral surface 126 of first swing arm 121 and the contact 211 of the second electric limit switch 21 is more than or equal to 180 °.Angle between the lateral surface 226 of second swing arm 221 and the contact 111 of the first electric limit switch 11 is more than or equal to 180 °.

Shown in Fig. 4 a, 4b; when rotating shaft 1 clockwise rotates 180 °; the lateral surface 126 of first swing arm 121 is run into the contact 211 of the second electric limit switch 21; because first projection 123 on first fixed arm 122 is close to the inboard of first swing arm 121; first swing arm 121 can only clockwise rotate; thereby first swing arm 121 contact of the second electric limit switch 21 is depressed, the loop of second electric limit switch 21 correspondences is disconnected, play the position limitation protection effect.Second swing arm 221 can only rotate counterclockwise, so under the effect of first catch 13, second swing arm 221 is rotated counterclockwise, can not run into the contact 111 of the first electric limit switch 11, and therefore the loop of first electric limit switch 11 correspondences does not disconnect.

Shown in Fig. 5 a, 5b; when rotating shaft 1 rotates counterclockwise 180 °; the lateral surface 226 of second swing arm 221 is run into the contact 111 of the first electric limit switch 11; because second swing arm 221 can only rotate counterclockwise; thereby the contact 111 of the first electric limit switch 11 depressed; the loop of first electric limit switch 11 correspondences is disconnected, play the position limitation protection effect.And first swing arm 121 can only clockwise rotate, so under the effect of second catch 23, first swing arm 121 turns clockwise, can not run into the contact 211 of the second electric limit switch 21, and therefore the loop of second electric limit switch 21 correspondences does not disconnect.

Claims

1. A rotary electric limit mechanism, comprising first and second electric limit switches (11), (21), first and second shift forks (12), (22); said first and second Electric limit switches (11), (21) are installed and fixed on the circumference of the turntable base (2); the first and second shift forks (12), (22) are installed and fixed on the outer circumference of the rotating shaft (1) ; It is characterized in that it also includes first and second blocking pieces (13), (23); the first and second blocking pieces (13), (23) are installed and fixed on the circumference of the turntable base (2); The first shift fork (12) is located at the same height as the second electric limit switch (21) and the second catch (23); the second shift fork (22) is at the same height as the first electric limit switch (11) The pieces (13) are located at the same height; at the 0° position, the first shift fork (12) and the first electric limit switch (11) and the first stop piece (13) are staggered up and down, and the second shift fork (22) and The second electric limit switch (21), the second catch (23) are staggered up and down; ) and the first tension spring (124); one end of the first tension spring (124) is fixedly connected with the first swing arm (121), and the other end is fixedly connected with the first fixed arm (122), and the first swing arm The length of (121) is greater than the distance from the outer circumference of the rotating shaft (1) to the first blocking plate (13), and the length of the first fixed arm (122) is less than the outer circumference of the rotating shaft (1) to the first blocking plate (23). ), the first swing arm (121) can rotate in one direction around the first pin shaft (125) relative to the first fixed arm (122); the second shift fork (22) is composed of the second fixed arm (222), the second Two swing arms (221), the second bearing pin (225) and the second extension spring (224) are composed; one end of the second extension spring (224) is fixedly connected with the second swing arm (221), and the other end is connected with the second extension spring (221). Two fixed arms (222) are fixedly connected, the length of the second swing arm (221) is greater than the distance from the outer circumference of the rotating shaft (1) to the second catch (23), and the length of the second fixed arm (222) is shorter than the rotating shaft The distance from the outer circumference of (1) to the second blocking piece (23); the second swing arm (221) can rotate in one direction around the second pin shaft (225) relative to the second fixed arm (222).

2. The rotary electric limit mechanism according to claim 1, characterized in that the upper surface of the first fixed arm (122) has a first protrusion (123), when the first swing arm (121) and the first fixed When the arm (122) did not rotate relatively, the first protrusion (123) was close to the inner side of the first swing arm (121); the upper surface of the second fixed arm (222) had a second protrusion (223). When the second swing arm (221) and the second fixed arm (222) do not rotate relative to each other, the second protrusion (223) is close to the inner side of the second swing arm (221).