CN216213070U

CN216213070U - Rotary limit switch

Info

Publication number: CN216213070U
Application number: CN202122472457.0U
Authority: CN
Inventors: 赵玉坤; 唐志强; 卢磊磊; 张聪; 孟凡超
Original assignee: Qingdao Big Herdsman Machinery Co Ltd
Current assignee: Qingdao Big Herdsman Machinery Co Ltd
Priority date: 2021-10-14
Filing date: 2021-10-14
Publication date: 2022-04-05
Anticipated expiration: 2031-10-14

Abstract

The utility model discloses a rotary limit switch, which comprises a base, a middle layer box and a sealing cover which are sequentially connected from bottom to top, wherein an encoder or a potentiometer is arranged in the middle layer box, a driving shaft rod, a main driving gear connected to a driving shaft, a limit large gear meshed with the main driving gear, and an encoder or a potentiometer gear meshed with the main driving gear and coaxially connected with the encoder or the potentiometer are respectively arranged in the base, at least one group of micro switches, cams corresponding to the micro switches, a gear set connected to the cams, an adjusting knob connected to the top end of the gear set and arranged at the outer top of the sealing cover, and a limit small gear integrally formed with the limit large gear and meshed with the gear set are respectively arranged in the middle layer box. The rotary limit switch has the functions of stroke limit setting and signal feedback, and the adjusting knob for adjusting the output stroke is external, simple to operate and convenient to use.

Description

Rotary limit switch

Technical Field

The utility model belongs to the technical field of switches, and particularly relates to a rotary limit switch.

Background

The limit switch is also called a travel switch and can be arranged on a relatively static object or a moving object. When the animal approaches a stationary object, the linkage of the switch drives the contacts of the switch causing the closed contacts to open or the open contacts to close. The circuit and the motor are controlled by the change of the on-off state of the switch contact, so that a certain control purpose is achieved. In general, a limit switch is used to limit the position or stroke of the movement of a machine, so that the moving machine can automatically stop, move in a reverse direction, move at a variable speed, automatically reciprocate, etc. according to a certain position or stroke.

The limit switch commonly used at present is a rotary cam type limit switch, in which a contact is mounted on a static bracket, a cam for operating the contact is mounted on a rotating shaft, the position of the cam is adjustable, and the rotating shaft is coupled with a starting motor implementation machine through a transmission chain or a gear mechanism, so that the rotation of a driving motor is transmitted to the rotating shaft of the rotary cam type limit switch, and the contact can be triggered at a required time interval by adjusting the shape and position of the cam on the rotating shaft. The stroke limit of the machine can be adjusted by changing the position of the cam. But current rotatory cam type limit switch only can carry out mechanical motion's position or stroke regulation in inside, and the governing speed is slow and operate inconveniently, simultaneously because it does not possess the signal feedback function, is not convenient for carry out the data acquisition and the safety monitoring of host computer, can't realize accurate control.

Accordingly, further improvements and enhancements are needed in the art.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems, a rotary limit switch is proposed, which has both stroke limit setting and signal feedback functions, a micro switch is provided to control the switch of the motor, an adjusting knob for adjusting the output stroke is externally arranged to increase the adjusting speed and simplify the operation, an encoder or a potentiometer is provided to output a pulse signal or an analog signal to a controller, and the number of rotations of an output shaft is fed back in real time to realize precise control.

In order to achieve the purpose, the utility model provides the following technical scheme:

the utility model provides a rotatory limit switch, it includes the base that connects gradually from bottom to top, middle level box and closing cap, be provided with encoder or potentiometre in the middle level box, be provided with the driving shaft pole in the base respectively, connect the main gear that drives in the drive shaft, with the spacing gear wheel of the main gear meshing of driving, with the main gear meshing of driving and with encoder or potentiometre coaxial coupling's encoder or potentiometre gear, still be provided with at least a set of micro-gap switch in the middle level box respectively, the cam that corresponds the micro-gap switch setting, connect the gear train on the cam, connect in the gear train top and arrange the adjust knob at closing cap outer top in, with spacing gear wheel integrated into one piece and with the spacing pinion of gear train meshing.

Further, the gear train includes the base gear with spacing pinion engagement, rotates the pinion of connecting in base gear top, integrated into one piece contact internal gear on the cam inner wall, sets up the spacing adjusting gear between contact internal gear and adjust knob, and the external tooth meshing of the internal tooth of the outside of pinion and contact internal gear and pinion is located to the contact internal gear cover, and the top of spacing adjusting gear is connected in adjust knob's bottom and the pinion meshing of spacing adjusting gear.

Furthermore, the number of the small gears is three, the small gears are evenly arranged along the top of the base gear, and the bottom of the limiting adjusting gear is located at the centers of the three small gears and is respectively meshed with the three small gears.

Furthermore, the limiting adjusting gear comprises a connecting block, a connecting column, a connecting disc and a connecting gear which are integrally formed from top to bottom, the connecting block is connected to the inner bottom of the adjusting knob, the connecting disc is slidably connected to the inner top of the contact internal gear, and the connecting gear is connected to the center of the bottom of the connecting disc and meshed with the pinion.

Furthermore, the micro switch, the cam, the gear sets and the adjusting knob are correspondingly provided with two groups, and base gears in the two groups of gear sets are respectively meshed with the limiting pinion.

Preferably, each group of the micro switches consists of two to four micro switches which are superposed up and down.

Furthermore, an encoder or a potentiometer support is arranged in the middle layer box corresponding to the encoder or the potentiometer, and the encoder or the potentiometer is detachably connected to the inner bottom of the middle layer box through the encoder or the potentiometer support.

Furthermore, a fixing support used for fixing the adjusting knob and the micro switch is further arranged in the middle layer box, a first limiting sleeve is arranged at the top of the fixing support corresponding to the adjusting knob, the adjusting knob is sleeved on the first limiting sleeve, and the end of the fixing support is in compression joint with the top of the micro switch.

Furthermore, at least one waterproof joint for wiring of the power transmission line is arranged on the outer wall of the middle box.

Furthermore, the base, the middle layer box and the sealing cover are detachably connected from top to bottom.

In summary, compared with the prior art, the utility model has the following beneficial effects:

(1) it possesses the spacing setting of stroke and signal feedback function simultaneously, sets up the switch of micro-gap switch in order to control motor, uses the design of level four gear, and the adjust knob of regulation output stroke size is external to make regulating speed fast and easy operation, convenient to use, sets up encoder or potentiometer and gives the controller with output pulse signal or analog signal, feeds back output shaft revolution in real time to realize accurate control.

(2) The motor switch is controlled by arranging two groups of micro switches, and two micro switches are arranged in each group of micro switches, so that the dual-protection effect is achieved.

(3) The utility model has the advantages of high control precision, compact structure, small occupied space, convenient output stroke adjustment, strong universality, convenient maintenance and installation and the like.

Drawings

Fig. 1 is an exploded view of a rotary limit switch according to embodiment 1 of the present invention;

fig. 2 is an exploded view of a rotary limit switch from another view in accordance with embodiment 1 of the present invention;

fig. 3 is a schematic structural view of a rotation limiting switch in an assembled state according to embodiment 1 of the present invention;

fig. 4 is a schematic structural view of a part of the structure of a rotary limit switch in embodiment 1 of the present invention;

fig. 5 is a plan view of another part of the structure of the rotary limit switch in embodiment 1 of the present invention;

fig. 6 is a schematic view of the overall structure of a rotary limit switch in embodiment 1 of the present invention;

fig. 7 is a half-cut view of the overall structure of a rotary limit switch in embodiment 1 of the present invention;

fig. 8 is a front view of the overall structure of a rotary limit switch in embodiment 1 of the present invention;

fig. 9 is a plan view of the entire structure of a rotary limit switch in embodiment 1 of the present invention;

in the drawings: 1. a base; 2. a middle layer box; 3. sealing the cover; 4. an encoder or potentiometer; 5. a drive shaft; 6. a main drive gear; 7. a large limiting gear; 8. a limit pinion; 9. a microswitch; 10. a cam; 11. adjusting a knob; 12. a base gear; 13. a pinion gear; 14. a contact internal gear; 15. a limit adjusting gear; 151. connecting blocks; 152. connecting columns; 153. connecting the disks; 154. a connecting gear; 16. an encoder or potentiometer gear; 17. an encoder or potentiometer support; 18. fixing a bracket; 19. a first limit sleeve; 21. a waterproof joint.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the following description is given for clear and complete description of the technical solution of the present invention with reference to the embodiments of the present invention, and other similar embodiments obtained by those skilled in the art without creative efforts based on the embodiments of the present application shall fall within the protection scope of the present application. In addition, directional terms such as "upper", "lower", "left", "right", etc. in the following embodiments are directions with reference to the drawings only, and thus, the directional terms are used for illustrating the present invention and not for limiting the present invention.

Detailed description of the preferred embodiment 1

A rotary limit switch is shown in figures 1-9 and comprises a base 1, a middle layer box 2 and a sealing cover 3 which are sequentially connected from bottom to top, wherein an encoder or a potentiometer 4 is arranged in the middle layer box 2, a driving shaft rod 5 is respectively arranged in the base 1, a main driving gear 6 connected to a driving shaft, a limit big gear 7 meshed with the main driving gear 6, an encoder or a potentiometer gear 16 meshed with the main driving gear 6 and coaxially connected with the encoder or the potentiometer 4, at least one group of micro switches 9, a cam 10 corresponding to the micro switches 9, a gear set connected to the cam 10, an adjusting knob 11 connected to the top end of the gear set and arranged at the outer top of the sealing cover 3, and a limit small gear 8 integrally formed with the limit big gear 7 and meshed with the gear set. The driving shaft lever 5 is connected with the output end of the motor. The corresponding microswitch 9 is activated when the cam 10 is rotated a certain position under the action of the set of cams 10. The motor drives the driving shaft lever 5 to rotate, drives the main driving gear 6 on the driving shaft lever 5 to rotate, and the limiting large gear 7 and the encoder or potentiometer gear 16 which are respectively meshed with the main driving gear 6 rotate along with the main driving gear 6. The encoder or the potentiometer gear 16 rotates, the encoder or the potentiometer 4 connected with the encoder or the potentiometer gear 16 in an inserting mode outputs a pulse signal or an analog quantity signal to the controller, and then a position signal is output, the revolution of an output shaft is fed back in real time, and accurate control is achieved. The limiting large gear 7 rotates to synchronously drive the limiting small gear 8 integrally formed with the limiting large gear to rotate, so that a gear set meshed with the limiting small gear 8 is driven to rotate, the cam 10 rotates along with the gear set, and when the cam 10 rotates to a certain position, the micro switch 9 is triggered, so that the switch of the motor is controlled; the gear set can be rotated through an external adjusting knob 11, and the position of the cam 10 can be controlled, so that the size of an output stroke is controlled, and the purpose of double-input and single-output of the microswitch 9 is realized.

The gear train includes base gear 12 with spacing pinion 8 meshing, rotate the pinion 13 of connecting in base gear 12 top, integrated into one piece contact internal gear 14 on cam 10 inner wall, set up spacing adjusting gear 15 between contact internal gear 14 and adjust knob 11, contact internal gear 14 cover is located the outside of pinion 13 and the meshing of the internal tooth of contact internal gear 14 and the external tooth of pinion 13, the top of spacing adjusting gear 15 is connected in the bottom of adjust knob 11 and the bottom of spacing adjusting gear 15 meshes with pinion 13. The top of the base gear 12 is provided with a mounting post corresponding to the pinion gear 13, and the pinion gear 13 is rotatably connected to the mounting post. The motor drives the rotation of a limiting large gear 7 through a driving shaft rod 5 and a main driving gear 6, a limiting small gear 8 rotates along with the rotation, the limiting small gear rotates with a base gear 12 meshed with the limiting small gear 8, the base gear 12 rotates to drive a small gear 13 arranged at the top of the base gear to rotate, the small gear 13 drives a contact internal gear 14 meshed with the small gear to rotate, so that a cam 10 rotates, a micro switch 9 is triggered when the cam 10 rotates to a certain position, and the motor is controlled to be switched on and off. When the motor does not rotate, the adjusting knob 11 is rotated, the limiting adjusting gear 15 rotates to drive the pinion 13 meshed with the limiting adjusting gear to rotate, so that the contact internal gear 14 and the cam 10 are driven to rotate, the cam 10 rotates to a certain position, the contact on the cam 10 is adjusted, and the size of an output stroke is controlled.

Preferably, three pinions 13 are uniformly arranged along the top of the base gear 12, and the bottom of the limit adjusting gear 15 is located at the center of the three pinions 13 and is meshed with the three pinions 13 respectively. Through the setting of three pinion 13, rotatory structure is stabilized to the stroke triangle-shaped, improves gear train pivoted stability to improve output stroke size adjustment's accuracy, motor switch control's stability and accuracy.

The limiting adjusting gear 15 comprises a connecting block 151, a connecting column 152, a connecting disc 153 and a connecting gear 154 which are integrally formed from top to bottom, the connecting block 151 is connected to the inner bottom of the adjusting knob 11, the connecting disc 153 is slidably connected to the inner top of the contact internal gear 14, and the connecting gear 154 is connected to the center of the bottom of the connecting disc 153 and meshed with the pinion 13. The connecting post 152 is a quadrangular prism which rotates with the rotation of the adjusting knob 11. In this embodiment, the connecting gear 154 is located at the center of the three pinions 13 and is engaged with the three pinions 13, and the connecting gear 154 rotates with the rotation of the adjusting knob 11 and drives the three pinions 13 to rotate, thereby driving the contact internal gear 14 and the cam 10 to rotate.

The micro switch 9, the cam 10, the gear sets and the adjusting knob 11 are correspondingly provided with two groups, and the base gears 12 in the two groups of gear sets are respectively meshed with the limiting pinion 8. Wherein, the microswitch 9, the cam 10 and the gear set are correspondingly arranged in the middle box 2 in parallel. The size formed by output is controlled by two groups of micro switches 9, a cam 10, a gear set and an adjusting knob 11, and the switch of the motor is controlled.

Preferably, each group of micro switches 9 is composed of two to four micro switches 9 stacked up and down, so that each group of micro switches 9 has multiple protection functions. In this embodiment, each group of micro switches 9 is composed of two micro switches 9 stacked up and down, and has a double protection function.

An encoder or potentiometer support 17 is arranged in the middle layer box 2 corresponding to the encoder or potentiometer 4, and the encoder or potentiometer 4 is detachably connected to the inner bottom of the middle layer box 2 through the encoder or potentiometer support 17.

The middle box 2 is also internally provided with a fixed support 18 for fixing the adjusting knob 11 and the microswitch 9, the top of the fixed support 18 is provided with a first limit sleeve 19 corresponding to the adjusting knob 11, the adjusting knob 11 is sleeved on the first limit sleeve 19, and the end part of the fixed support 18 is pressed on the top of the microswitch 9. In this embodiment, fixed bolster 18 overall structure is the arc, and the top of fixed bolster 18 corresponds two adjust knob 11 and is provided with two first limit sleeve 19 in parallel, corresponds two first limit sleeve 19 on the closing cap 3 and is provided with two mounting holes, and outside the mounting hole was worn out in the limit sleeve correspondence, the fixed cover in bottom of adjust knob 11 was located on the limit sleeve. The both ends of fixed bolster 18 bend downwards respectively and form L type preforming, and the horizontal part crimping of L type preforming is provided with rectangular hole in micro-gap switch 9's top on the L type preforming, corresponds rectangular hole on the bottom in middle level box 2 and is provided with two pegs graft posts side by side, when L type preforming crimping in micro-gap switch 9's top, two peg graft posts peg graft in rectangular downthehole, carry out the fixed of position to micro-gap switch 9.

Each gear and the encoder or the potentiometer 4 in the corresponding gear set on the middle layer box 2 are provided with a second limiting sleeve, and a rotating shaft of the encoder or the potentiometer 4 penetrates through the corresponding second limiting sleeve to be fixedly connected to the center of the encoder or the potentiometer gear 16, so that the encoder or the potentiometer gear 16 is limited and can only rotate but can not move. In addition, the main driving gear 6 can only rotate and cannot move under the action of the driving shaft rod 5 and the limiting large gear 7 under the action of the limiting small gear 8, so that the rotating stability of the main driving gear 6, the limiting large gear 7 and the encoder or potentiometer gear 16 is ensured, and the control precision and stability of the motor and the stability of signal feedback are improved.

The outer wall of the middle box 2 is provided with at least one waterproof joint 21 for the wiring of the power transmission line. In this embodiment, two sets of waterproof joints 21 are disposed on the outer wall of the middle box 2, and the two sets of waterproof joints 21 are respectively disposed near the two sets of micro switches 9.

The base 1, the middle box 2 and the sealing cover 3 are detachably connected from top to bottom. Specifically, the middle layer box 2 and the base 1 of the sealing cover 3 are sequentially buckled and the buckling parts are respectively connected together through fasteners such as bolts, so that the sealing cover is convenient to mount and dismount.

The present invention has been described in detail, and it should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the utility model, are intended for purposes of illustration only and are not intended to limit the scope of the utility model.

Claims

1. A rotary limit switch is characterized in that: including the base that connects gradually from bottom to top, middle level box and closing cap, be provided with encoder or potentiometre in the middle level box, be provided with the driving shaft pole respectively in the base, connect in the epaxial main gear that drives of drive, with the spacing gear wheel of main gear engagement, with main gear engagement that drives and with encoder or potentiometre coaxial coupling's encoder or potentiometre gear, still be provided with at least a set of micro-gap switch respectively in the middle level box, the cam that corresponds micro-gap switch setting, connect the gear train on the cam, connect in the gear train top and arrange the adjust knob at closing cap outer top in, with spacing gear wheel integrated into one piece and with the spacing pinion of gear train meshing.

2. The rotary limit switch of claim 1, wherein: the gear train includes the base gear with spacing pinion engagement, rotates and connects in the pinion at base gear top, integrated into one piece contact internal gear on the cam inner wall, set up the spacing adjusting gear between contact internal gear and adjust knob, the outside of pinion and the external tooth meshing of the internal tooth of contact internal gear and pinion are located to the contact internal gear cover, the top of spacing adjusting gear is connected in adjust knob's bottom and the pinion toothing of spacing adjusting gear.

3. The rotary limit switch of claim 2, wherein: the number of the small gears is three along the top of the base gear, and the bottom of the limiting adjusting gear is located at the center of the three small gears and is meshed with the three small gears respectively.

4. The rotary limit switch of claim 2, wherein: the limiting adjusting gear comprises a connecting block, a connecting column, a connecting disc and a connecting gear which are integrally formed from top to bottom, the connecting block is connected to the inner bottom of the adjusting knob, the connecting disc is slidably connected to the inner top of the contact internal gear, and the connecting gear is connected to the center of the bottom of the connecting disc and meshed with the pinion.

5. The rotary limit switch of claim 2, wherein: the micro switch, the cam, the gear sets and the adjusting knob are correspondingly provided with two groups, and base gears in the two groups of gear sets are respectively meshed with the limiting pinion.

6. The rotary limit switch of claim 5, wherein: each group of micro switches consists of two to four micro switches which are superposed up and down.

7. The rotary limit switch of claim 1, wherein: an encoder or a potentiometer support is arranged in the middle layer box corresponding to the encoder or the potentiometer, and the encoder or the potentiometer is detachably connected to the inner bottom of the middle layer box through the encoder or the potentiometer support.

8. The rotary limit switch of claim 1, wherein: the middle layer box is also internally provided with a fixed support for fixing the adjusting knob and the microswitch, the top of the fixed support is provided with a first limiting sleeve corresponding to the adjusting knob, the adjusting knob is sleeved on the first limiting sleeve, and the end part of the fixed support is pressed on the top of the microswitch.

9. The rotary limit switch of claim 1, wherein: and at least one waterproof joint for wiring of the power transmission line is arranged on the outer wall of the middle box.

10. The rotary limit switch of claim 1, wherein: the base, the middle layer box and the sealing cover are detachably connected from top to bottom.