1. The utility model provides a straight stroke mechanism of gyration valve executor, includes the pedestal, rotates to be connected driving piece and cooperation on the pedestal are installed and are used for turning into linear motion's output spare, its characterized in that with circular motion on the driving piece: the output member is fixed with a supporting member, the outer side wall of the supporting member is provided with a plurality of limiting grooves, the straight stroke mechanism of the rotary valve actuator further comprises a limiting device, the limiting device comprises a positioning seat fixedly installed on the base body, a plurality of rollers and a monitor, the rollers are rotatably installed on the positioning seat, the rollers are uniformly distributed on the positioning seat along the circumferential direction of the positioning seat, the rollers correspond to the limiting grooves and are arranged in a plurality, the rollers are matched and supported in the limiting grooves in a one-to-one correspondence mode, and the monitor is used for being electrically connected with the corresponding rotary valve actuator and monitoring the running condition of the rollers so as to judge whether the rollers are separated from the supporting member.

2. A linear travel mechanism for a rotary valve actuator as claimed in claim 1, wherein: the limiting groove is arranged on the abutting piece along the axial direction of the abutting piece.

3. A linear travel mechanism for a rotary valve actuator as claimed in claim 1, wherein: the outer side wall of the abutting part forms an abutting surface vertical to the radial direction of the abutting part and circumferential limiting surfaces respectively positioned on two sides of the abutting surface through the arrangement of the limiting groove, and the circumferential limiting surfaces are distributed on the abutting part along the approximate radial direction of the abutting part.

4. A linear travel mechanism for a rotary valve actuator as claimed in claim 1, wherein: the limiting grooves are three.

5. A linear travel mechanism for a rotary valve actuator as claimed in claim 4, wherein: the number of the rollers is three corresponding to the limiting grooves.

6. A linear travel mechanism for a rotary valve actuator as claimed in claim 3, wherein: the rolling contact surface is arranged along the arc end surface of the roller, and the two end surfaces of the roller, which are adjacent to the rolling contact surface, are respectively provided with a limiting surface.

7. A linear travel mechanism for a rotary valve actuator as claimed in claim 6, wherein: the rolling contact surface of the roller is abutted against the abutting surface on the abutting piece, and the limiting surface of the roller is abutted against the circumferential limiting surface on the abutting surface.

8. A linear travel mechanism for a rotary valve actuator as claimed in claim 1, wherein: the monitor is connected with the rotating shaft of the roller.

9. A linear travel mechanism for a rotary valve actuator as claimed in claim 1, wherein: the monitor is a potentiometer.

10. A linear travel mechanism for a rotary valve actuator as claimed in claim 1, wherein: the straight stroke mechanism of the rotary valve actuator further comprises a mounting frame, and the mounting frame is fixedly mounted on the base body.

Background

The rotary valve actuator can only output circular motion, namely can only drive a rotary valve, so that a straight stroke mechanism of the rotary valve actuator appears. However, the conventional straight stroke mechanism of the rotary valve actuator does not have an over-stroke protection structure, and the straight stroke mechanism or a matched valve is easily damaged when the straight stroke mechanism is over-stroke due to out-of-control of a circuit of the valve actuator or deviation generated by resetting of the straight stroke mechanism.

It is therefore desirable to provide a new linear travel mechanism for a rotary valve actuator that addresses the above-mentioned problems.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the straight stroke mechanism of the rotary valve actuator can carry out overtravel protection and eliminate the hidden trouble caused by overtravel.

The technical scheme adopted by the invention for solving the technical problems is as follows: a straight stroke mechanism of a rotary valve actuator comprises a base body, a driving piece rotationally connected to the base body and an output piece which is arranged on the driving piece in a matching mode and used for converting circular motion into linear motion; the output member is fixed with a supporting member, the outer side wall of the supporting member is provided with a plurality of limiting grooves, the straight stroke mechanism of the rotary valve actuator further comprises a limiting device, the limiting device comprises a positioning seat fixedly installed on the base body, a plurality of rollers and a monitor, the rollers are rotatably installed on the positioning seat, the rollers are uniformly distributed on the positioning seat along the circumferential direction of the positioning seat, the rollers correspond to the limiting grooves and are matched and supported in the limiting grooves in a one-to-one correspondence mode, and the monitor is used for being electrically connected with the corresponding rotary valve actuator and monitoring the running condition of the rollers so as to judge whether the rollers are separated from the supporting member.

Furthermore, the limiting groove is arranged on the abutting piece along the axial direction of the abutting piece.

Furthermore, the arrangement of the limit groove enables the outer side wall of the abutting piece to form an abutting surface perpendicular to the radial direction of the abutting piece and circumferential limit surfaces respectively positioned on two sides of the abutting surface, and the circumferential limit surfaces are distributed on the abutting piece along the approximate radial direction of the abutting piece.

Further, the limiting grooves are three.

Furthermore, the number of the rollers is three corresponding to the limiting grooves.

Furthermore, rolling contact surfaces are arranged along the arc end surfaces of the rollers, and two limit surfaces are respectively arranged on the two end surfaces of the rollers, which are adjacent to the rolling contact surfaces.

Furthermore, the rolling contact surface of the roller is abutted against the abutting surface on the abutting piece, and the limiting surface of the roller is abutted against the circumferential limiting surface on the abutting surface.

Further, the monitor is connected with the rotating shaft of the roller.

Further, the monitor is a potentiometer.

Furthermore, the straight stroke mechanism of the rotary valve actuator further comprises an installation frame, and the installation frame is fixedly installed on the seat body.

The invention has the beneficial effects that: the output member is fixed with a supporting member, the outer side wall of the supporting member is provided with a plurality of limiting grooves, the straight stroke mechanism of the rotary valve actuator also comprises a limiting device, the limiting device comprises a positioning seat fixedly arranged on the base body, a plurality of rollers and a monitor, the rollers are rotatably arranged on the positioning seat, the rollers are uniformly distributed on the positioning seat along the circumferential direction of the positioning seat, the rollers correspond to the limiting grooves, the rollers are correspondingly supported in the limiting grooves in a one-to-one manner, the monitor is electrically connected with the corresponding rotary valve actuator and used for monitoring the running condition of the rollers so as to judge whether the rollers are separated from the supporting member or not, when the output member moves and exceeds the set stroke, the supporting member is separated from the contact with the rollers, the rollers stop rotating, the monitor monitors that the rollers stop rotating and can send signals to the corresponding rotary valve actuator, the rotary valve actuator is controlled to stop rotating, so that the overtravel protection function is realized.

Drawings

The invention is further illustrated by the following figures and examples.

In the figure: FIG. 1 is a perspective view of a linear travel mechanism of a rotary valve actuator of the present invention;

FIG. 2 is an exploded view of the linear travel mechanism of the rotary valve actuator shown in FIG. 1, with the mounting bracket omitted;

FIG. 3 is a schematic structural view of the holding member shown in FIG. 2;

FIG. 4 is a schematic structural view of the stop device in FIG. 2;

FIG. 5 is a schematic view of the structure of the roller of the position limiting device shown in FIG. 4;

FIG. 6 is a schematic view of the engagement of the limiting device with the output member;

FIG. 7 is a cross-sectional view of FIG. 6, with the cross-sectional view being coplanar with the axes of the plurality of rollers;

fig. 8 is a schematic of the linear travel mechanism of the rotary valve actuator of the present invention showing the output member moving upward to an over-travel condition.

100. A base body; 110. a through hole; 120. a shaft sleeve; 200. a drive member; 300. an output member; 310. a holding member; 311. a limiting groove; 3111. a propping surface; 3112. a circumferential limiting surface; 400. a limiting device; 410. positioning seats; 411. avoiding holes; 420. a roller; 4201. a rotating shaft; 421. a rolling contact surface; 422. a limiting surface; 430. a monitor; 500. and (7) mounting frames.

Detailed Description

The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, and merely illustrates the basic structure of the present invention in a schematic manner, and therefore it shows only the constitution related to the present invention.

As shown in fig. 1, the present invention provides a straight stroke mechanism of a rotary valve actuator, which includes a seat 100, a driving element 200 rotatably connected to the seat 100, and an output element 300 for cooperating with the driving element 200 to implement circular linear motion, wherein the driving element 200 is connected to an output end of the rotary valve actuator, and the output element 300 is connected to a valve rod of a linear motion valve, so that the rotary valve actuator can drive the linear motion valve to move.

Further, the linear stroke mechanism of the rotary valve actuator further comprises a limiting device 400.

As shown in fig. 2, in a specific embodiment, the housing 100 is a disc-shaped structure, and a through hole 110 for allowing the output element 300 to pass through the housing 100 is opened at the center of the housing 100 along the axial direction of the housing 100.

In one embodiment, a shaft sleeve 120 is fixedly installed on one end surface of the housing 100 along the axial direction of the housing 100 in order to allow the driving member 200 to be rotatably coupled to the housing 100, and in this embodiment, a ball bearing is installed inside the shaft sleeve 120 in order to allow the driving member 200 to rotate more smoothly.

The driving member 200 is rotatably mounted on the housing 100, specifically, the driving member 200 is rotatably received in the shaft sleeve 120, and in the present embodiment, the driving member 200 is disposed coaxially with the housing 100.

The output member 300 is cooperatively mounted on the driving member 200 to form a screw nut structure, and the output member 300 is fixedly mounted with the supporting member 310, as shown in fig. 3, an outer sidewall of the supporting member 310 has a plurality of limiting grooves 311, the limiting grooves 311 are disposed on the supporting member 310 along an axial direction of the supporting member 310, the outer sidewall of the supporting member 310 forms a supporting surface 3111 perpendicular to a radial direction of the supporting member 310 and circumferential limiting surfaces 3112 respectively disposed on two sides of the supporting surface 3111, the circumferential limiting surfaces 3112 are disposed on the outer sidewall of the supporting member 310 along a substantially radial direction of the supporting member 310, and the plurality of limiting grooves 311 are uniformly distributed on the supporting member 310 along the circumferential direction of the supporting member 310.

In the present embodiment, the output member 300 is a lead screw, and the corresponding driving member 200 is a lead screw nut engaged with the lead screw, and the lead screw is engaged with the lead screw nut through the through hole 110 of the seat body 100.

It will be appreciated that in other embodiments not shown, the output member 300 may be a lead screw nut, the corresponding driving member 200 is a lead screw engaged with the lead screw nut, the lead screw is rotatably mounted on the housing 100, and the lead screw nut is engaged with the lead screw.

The limiting device 400 is disposed at an end of the base 100 away from the shaft sleeve 120, and as shown in fig. 4, the limiting device 400 includes a positioning seat 410, a plurality of rollers 420 rotatably mounted on the positioning seat 410, and a monitor 430 fixedly mounted on the positioning seat 410.

The positioning seat 410 is a disc-shaped structure, an avoiding hole 411 is formed in the center of the positioning seat 410 along the axial direction of the positioning seat 410, the positioning seat 410 is fixedly connected to an end face, away from the shaft sleeve 120, of the base body 100, the avoiding hole 411 and the output member 300 are coaxially arranged, and the output member 300 penetrates through the avoiding hole 411 of the positioning seat 410.

The roller 420 is rotatably installed on an end surface of the positioning seat 410 away from the base body 100, the rollers 420 are correspondingly supported in the limiting grooves 311, as shown in fig. 5, more precisely, a rolling contact surface 421 is provided along an arc end surface of the roller 420, a limiting surface 422 is respectively provided on two end surfaces of the roller 420 adjacent to the rolling contact surface 421, in a specific embodiment, a bearing seat (not shown) is provided on the base body 100 corresponding to the roller 420, a rotating shaft 4201 rotatably connected with the bearing seat is fixedly installed at the center of the roller 420, an axial line of the roller 420 is parallel to the end surface of the positioning seat 410, the axial line of the roller 420 is perpendicular to a radial direction of the positioning seat 410, and the rollers 420 are uniformly distributed on the positioning seat 410 along a circumferential direction of the positioning seat 410.

Referring to fig. 7, the rolling contact surface 421 of each roller 420 contacts with the supporting surface 3111 of the supporting member 310, and the limiting surface 422 of the roller 420 contacts with the circumferential limiting surface 3112 of the supporting surface 3111, in this embodiment, three limiting grooves 311 of the roller 420 corresponding to the supporting member 310 are provided. Therefore, when the driving element 200 rotates, the abutting between the limiting surface 422 and the circumferential limiting surface 3112 can limit the output element 300 to rotate along the circumferential direction, and when the output element 300 performs a linear motion along the axial direction of the seat body 100 in cooperation with the rotation motion of the driving element 200, the rolling contact surface 421 of the roller 420 contacts with the abutting surface 3111 on the abutting element 310, so that the roller 420 is driven to perform a circular motion along with the output element 300, and on the other hand, the roller 420 abutting against the side surface of the output element 300 can also perform a positioning and guiding function on the output element 300.

The monitor 430 is connected to the rotating shaft 4201 of the roller 420, and the monitor 430 is used for electrically connecting to a corresponding rotary valve actuator and for monitoring the operating condition of the roller 420, in this embodiment, the monitor 430 is connected to the rotating shaft 4201 of one of the rollers 420, in this embodiment, the monitor 430 is a potentiometer connected to the rotating shaft 4201 of the roller 420, so that when the roller 420 rotates, the potentiometer can determine the operating condition of the roller 420 through the change of resistance, and when the roller 420 of the limiting device 400 is out of contact with the abutting member 310 on the output member 300, the potentiometer will detect the roller 420 to stop, so as to determine whether the output member 300 is over-traveled, and thus can send a stop signal to the corresponding rotary valve actuator to control the valve actuator to stop.

In other embodiments not shown, the monitor 430 may also be an absolute value encoder or other angular displacement sensor.

In one embodiment, as shown in fig. 1, the linear stroke mechanism of the rotary valve actuator further includes a mounting bracket 500, the mounting bracket 500 is fixedly mounted at one end of the housing 100 close to the limiting device 400, and the mounting bracket 500 is used for fixedly mounting the linear stroke mechanism of the rotary valve actuator at a designated position.

The working process of the linear stroke mechanism of the rotary valve actuator of the invention is described below with reference to the accompanying drawings:

referring to fig. 1 or 8, when the driving member 200 rotates to drive the output member 300 to move linearly in the axial direction, the abutting member 310 on the output member 300 is in contact with the roller 420 on the limiting device 400, so that the roller 420 rotates along with the output member 300, and when the output member 300 moves beyond a set stroke, the abutting member 310 is separated from the contact with the roller 420, so that the roller 420 stops rotating, and the monitor 430 on the limiting device 400 monitors that the roller 420 stops rotating, and can control the rotation of the rotary valve actuator to stop by sending the model number to the corresponding rotary valve actuator, thereby playing a role of over-travel protection.

Therefore, the straight stroke mechanism of the rotary valve actuator has the following beneficial effects:

the output member 300 is fixed with a supporting member 310, the outer side wall of the supporting member 310 is provided with a plurality of limiting grooves 311, the straight stroke mechanism of the rotary valve actuator further comprises a limiting device 400, the limiting device 400 comprises a positioning seat 410 fixedly installed on the base body 100, a plurality of rollers 420 rotatably installed on the positioning seat 410 and a monitor 430, the plurality of rollers 420 are uniformly distributed on the positioning seat 410 along the circumferential direction of the positioning seat 410, the plurality of rollers 420 are corresponding to the limiting grooves 311, the plurality of rollers 420 are correspondingly supported in the plurality of limiting grooves 311 in a one-to-one matching manner, the monitor 430 is used for electrically connecting with the corresponding rotary valve actuator and monitoring the operating condition of the rollers 420 to judge whether the rollers 420 are separated from the supporting member 310, so that when the output member 300 moves and exceeds the set stroke, the supporting member 310 is separated from the contact with the rollers 420 at the moment, and the rollers 420 stop rotating, the monitor 430 will monitor the roller 420 stalling and can control the slewing valve actuator to stall by sending a signal to the corresponding slewing valve actuator, thereby performing the overtravel protection function.

In light of the foregoing description of preferred embodiments in accordance with the invention, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and must be determined according to the scope of the claims.