CN220306950U

CN220306950U - Anti-over-rotation electric actuator

Info

Publication number: CN220306950U
Application number: CN202321241551.8U
Authority: CN
Inventors: 戎凯波; 戎士杰; 张鑫; 张晔辉
Original assignee: Cixi Kaiye Electric Co ltd
Current assignee: Cixi Kaiye Electric Co ltd
Priority date: 2023-05-21
Filing date: 2023-05-21
Publication date: 2024-01-05
Anticipated expiration: 2033-05-21

Abstract

An anti-over-rotation electric actuator comprises a shell assembly, a motor, a speed reduction transmission assembly and an output part which are sequentially connected in a transmission way, wherein the motor is electrically connected with a control circuit board; the transmission assembly or the output part is fixedly provided with a position feedback piece, and the position feedback piece at least has a full-open position state and a full-closed position state; the shell component is also provided with a limiting component, and the position feedback piece is propped against the limiting component and forms limiting fit when in a fully-opened position state and a fully-closed position state; when the position feedback piece is propped against the limiting component, the instantaneous current of the motor is increased, and the control circuit board controls the motor to stop rotating after monitoring the current increase. According to the utility model, through detecting that the current is larger than the current in normal operation when the motor is locked, the motor is stopped, and the accurate position is stopped. The position sensing of the output component is realized by utilizing the monitoring of the current in the circuit, so that the parts such as a micro switch or a light-sensitive switch are omitted, the wiring complexity is reduced, and the fault probability is reduced.

Description

Anti-over-rotation electric actuator

Technical Field

The utility model relates to the technical field of flow instrument control devices, in particular to an anti-over-rotation electric actuator.

Background

The flow metering instrument, such as water meter, ammeter, gas meter, etc. is an indispensable device in daily life and production, taking water meter as an example, traditional water meter includes water meter shell and metering movement set in water meter shell, where the metering movement is basically a mechanical digital wheel disc, and the metering value can be recorded.

The intelligent instrument combines the executor and the traditional instrument together, thereby realizing the function of intelligent control instrument switch. The actuator is an actuator and control valve combination in an automatic control system, which functions in the automatic control system to receive signals from the regulator to regulate the flow of process medium in accordance with its position and characteristics in the process line, thereby controlling the controlled quantity within the range required by the production process.

An actuator is usually additionally arranged on the intelligent water meter, and the actuator is used for controlling the opening or closing of a meter in the water meter, namely, when a metering signal recorded on a display control circuit of a server end or a mobile end of an operator reaches a threshold value, the actuator can be driven to execute closing or opening actions, so that the intelligent water meter at the present stage basically comprises three large components, namely a collector, a PCB and the actuator.

See patent document CN208381442U, a small-sized electric actuator with good sealing performance is disclosed, which comprises a housing, a gear reduction group and a motor, wherein the gear reduction group and the motor are arranged in the housing, an input gear of the gear reduction group is connected with the motor in a transmission way, an output gear of the gear reduction group is connected with an output shaft for controlling the valve to open and close, a partition plate is further arranged in the housing, the partition plate divides the housing into an independent motor chamber and a reduction chamber, the motor is positioned in the motor chamber, the gear reduction group is positioned in the reduction chamber, two micro switches with 90-degree intervals are arranged on the partition plate, a guide groove is formed in the partition plate, the guide groove is positioned between the two micro switches, a switch deflector rod is arranged on the output gear of the gear reduction group in a protruding way, and the switch deflector rod penetrates through the guide groove and is in contact connection with the micro switches.

As described in the above patent, in the conventional electric actuator technology, in order to control the stroke of the motor (output shaft), a combination of a micro switch and a switch lever is adopted, and once the motor touches the electric actuator, a signal that the electric actuator has been fully opened or fully closed is fed back, which means that the maximum movement stroke is reached, and the motor is stopped in time. However, such solutions also have certain drawbacks, such as: 1. 1 micro switch is correspondingly arranged at the beginning and the end of the travel, so that at least 2 power consumption parts are increased, the complexity of wiring is increased, and the probability of faults is increased; 2. the original shape can be changed due to the increase of parts, and meanwhile, the installation space is required to be set aside, so that the size of the whole electric actuator is increased, and the subsequent assembly is not facilitated; 3. the contact piece on the contact switch has material fatigue, and irreversible deformation appears after repeated use, so that the subsequent contact position change and the positioning precision decline, and further the phenomenon that the motor is stopped too early or too late, namely the problem of leakage or motor locked-rotor can appear.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model provides the anti-over-rotation electric actuator, the control of the motor is realized through the detection feedback of the current, and meanwhile, a contact switch is canceled to reduce the volume and the failure rate.

The technical scheme for solving the technical problems is as follows: an anti-over-rotation electric actuator comprises a shell component, a motor, a speed reduction transmission component and an output component, wherein the motor, the speed reduction transmission component and the output component are arranged in the shell component and are sequentially connected in a transmission mode, and the motor is electrically connected with a control circuit board;

the transmission assembly or the output part is fixedly provided with a position feedback piece, and the position feedback piece at least has a full-open position state and a full-closed position state;

the shell assembly is also provided with a limiting member, and the position feedback piece is propped against the limiting member and forms limiting fit when in a fully-opened position state and a fully-closed position state;

when the position feedback piece is propped against the limiting component, the instantaneous current of the motor is increased, and the control circuit board controls the motor to stop rotating after detecting the current increase.

The beneficial effects of this embodiment are: the motor running characteristic and the circuit characteristic are combined, the motor running characteristic and the circuit characteristic are applied to a product of the electric actuator, once the motor encounters limit locked-rotor, the instantaneous current at the motor in the circuit can be obviously increased, so that a signal of abnormal current is captured by the control circuit board, and a command for stopping rotation is immediately sent to the motor.

In the above technical scheme, the housing assembly is divided into a first chamber and a second chamber by a framework plate, the motor is installed in the first chamber, the reduction transmission assembly and the output component are arranged in the second chamber, and the motor is arranged in the first chamber.

The beneficial effects of this embodiment are: the dry and wet partition is not affected by each other, and ensures stable use for a long time.

Further, the limiting component is a track groove formed in the skeleton plate, the position feedback piece is inserted into the track groove and forms clearance fit with the side wall of the track groove, and the position feedback piece can abut against the head end and the tail end of the track groove to form limiting fit.

The beneficial effects of this embodiment are: the integrated level is high, the whole thickness dimension is compressed, and under the condition of realizing functions, the production process is simplified, and the cost is reduced.

Further, the speed reduction transmission assembly is a gear transmission assembly, the gear transmission assembly comprises an input gear, a plurality of stages of speed reduction gears and an output gear, the output gear is connected with the output part, and the position feedback piece is arranged on the output gear.

Further, the position feedback piece is a positioning rod, the positioning rod is fixed at the non-tooth center of the output gear, and the positioning rod is inserted into the track groove.

In the technical scheme, the output component is a rotary output shaft, the position feedback component is a positioning rod, the positioning rod is fixed at a non-rod center of the rotary output shaft, and the positioning rod is inserted into the track groove.

In some embodiments of the present utility model, the housing assembly includes an upper housing and a lower housing, wherein the upper housing has a screw hole therein, and the screw hole is filled with a fastener to assemble the upper housing and the lower housing together, and the upper housing is attached to the bone plate.

With respect to the technical scheme, a circle of concave area is arranged on the outer side of the upper shell, the screw hole is arranged at the concave area, and sealing glue is injected into the concave area.

The beneficial effects of this embodiment are: the glue filling amount is reduced, and the effect of reducing the cost is achieved under the condition of ensuring the tightness.

With respect to the technical scheme, the upper shell is provided with the avoidance area, and the position feedback member can enter the avoidance area.

With respect to the above technical scheme, the lower end of the lower shell is convexly provided with a butt joint part, the butt joint part is provided with a butt joint hole, the output part at least partially stretches into the butt joint hole, and the butt joint hole is internally provided with a sheath.

The beneficial effects of this embodiment are: the existence of sheath and butt joint portion can prevent output part and valve rod exposure to the outside, plays better protective effect.

The utility model has the beneficial effects that:

1. the motor stall and the accurate position stop are realized by detecting that the current is larger than the current in normal operation when the motor stalls.

2. The position sensing of the output component is realized by utilizing the monitoring of the current in the circuit, so that the parts such as a micro switch or a light-sensitive switch are omitted, the wiring complexity is reduced, and the fault probability is reduced.

3. The reduction of spare part makes skeleton board and last casing can laminate in a large scale, and then reduces the overall dimension of moving the executor to follow-up assembly and use.

4. The defect of material fatigue does not exist, so that the detection precision and the operation precision can be kept stable and unchanged after repeated use, the operation of the motor can be continuously and accurately controlled, and the problems of leakage, motor locked-rotor and the like are solved.

Drawings

Fig. 1 is a schematic view of the assembly of the present utility model.

Fig. 2 is an exploded view of the present utility model.

Fig. 3 is a schematic view of the structure of the upper housing in the present utility model.

Fig. 4 is a schematic view of an assembly of the present utility model at another angle.

Fig. 5 is a cross-sectional view of the present utility model.

Fig. 6 is a schematic view of the structure of the bone plate according to the present utility model.

Fig. 7 is a schematic view of the internal structure of the present utility model.

In the figure: 1. a housing assembly; 101. an upper housing; 102. a lower housing; 103. a recessed area; 104. a screw hole; 105. an avoidance zone; 106. a butt joint part; 1061. a butt joint hole; 2. a motor; 3. a reduction transmission assembly; 301. an input gear; 302. a reduction gear, 303, an output gear; 4. an output member; 5. a position feedback member; 5a, a fully open position state; 5b, a fully closed position state; 6. a limiting member; 7. a bone plate; 701. a first chamber; 702. a second chamber; 703. a track groove; 8. and (3) a sheath.

Detailed Description

The utility model will be further described with reference to the drawings and specific examples. It should be noted that the examples are only specific to the present utility model and are for the purpose of better understanding of the technical solutions of the present utility model to those skilled in the art, and should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, as the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like are used for convenience of description and simplicity of description, only as to the orientation or positional relationship shown in the drawings, and not as an indication or suggestion that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model.

In the description of the present utility model, it should be noted that unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases to those skilled in the art.

Example 1

Referring to fig. 1 to 7, an anti-over-rotation electric actuator comprises a shell component 1, a motor 2, a reduction transmission component 3 and an output component 4, wherein the motor 2, the reduction transmission component 3 and the output component 4 are arranged in the shell component 1 and are sequentially in transmission connection, and the motor 2 is electrically connected with a control circuit board;

the transmission assembly or the output part 4 is fixedly provided with a position feedback piece 5, and the position feedback piece 5 at least has a full-open position state 5a and a full-closed position state 5b;

the shell assembly 1 is also provided with a limiting member 6, and the position feedback piece 5 is propped against the limiting member 6 and forms limiting fit when in a fully-opened position state 5a and a fully-closed position state 5b;

when the position feedback piece 5 is propped against the limiting component 6, the instantaneous current of the motor 2 increases, and the control circuit board controls the motor 2 to stop rotating after detecting the current increase.

The above-mentioned matters are basic scheme of the utility model, the operation characteristic of the motor 2 is combined with the circuit characteristic, and the motor 2 is applied to the product of the electric actuator, once the motor 2 encounters limit locked-rotor, the instantaneous current at the motor 2 in the circuit can be obviously increased, so that the signal of abnormal current is captured by the control circuit board, and the command for stopping rotation is immediately sent to the motor 2.

The circuit for detecting the current of the motor 2 is widely available in the market, and is not particularly limited herein. In order to capture the current increasing signal of the locked rotor of the motor 2, for example, a preferred scheme is that an operational amplifier circuit is integrated in the control circuit board, the operational amplifier circuit amplifies the detected locked rotor current to a required degree, and the control circuit board controls the operation of the whole set of circuit by detecting the current detected by the operational amplifier, so that the accurate position of the motor 2 is stopped.

The control circuit board is mostly external to the housing assembly 1 and is therefore not shown in the figures.

Example two

The internal partition structure of the housing assembly 1 is preferably: referring to fig. 5 to 6, the housing assembly 1 is divided into a first chamber 701 and a second chamber 702 by a frame plate 7, the motor 2 is installed in the first chamber 701, the reduction transmission assembly 3 and the output member 4 are disposed in the second chamber 702, and the motor 2 is disposed in the first chamber 701. The effect similar to a dry-wet partition is formed, the electric components such as the motor 2 are arranged in the dry partition, the reduction transmission assembly 3 and the output component 4 are arranged in the wet partition, and the reduction transmission assembly and the output component are not affected by each other, so that the reduction transmission assembly is ensured to be used stably for a long time.

Preferably, the limiting member 6 is a track groove 703 directly formed on the framework plate 7, the position feedback element 5 is inserted into the track groove 703 and forms clearance fit with a side wall of the track groove 703, so as to prevent abnormal current signals caused by erroneous contact, and the position feedback element 5 can abut against the front end and the rear end of the track groove 703 to form limit fit, so that the current can be increased while the maximum opening and closing position is ensured. The limiting member 6 (namely the track groove 703) is formed on the framework plate 7, and has the advantages that firstly, the original 2 independent component limiting members 6 and the framework plate 7 are combined into one, the integration level is high, and under the condition of realizing functions, the production process is simplified, and the cost is reduced; secondly, can make space structure part reuse, and then can compress holistic thickness size for the size of whole electric actuator is littleer, in order to carry out follow-up installation.

Example III

On the basis of the second embodiment, this embodiment makes further preferable structural limitations, specifically as follows: referring to fig. 2, 5 and 7, the reduction gear assembly 3 is a gear assembly, and the gear assembly includes an input gear 301, a plurality of stages of reduction gears 302, and an output gear 303, where the output gear 303 is connected to the output member 4, and the input gear 301 and the plurality of stages of reduction gears 302 corresponding to the output member 4 may need to rotate for a plurality of turns in a switching stroke due to a transmission ratio, so it is not suitable to provide the position feedback member 5 on the input gear 301 and the reduction gears 302. In this embodiment, the position feedback member 5 is selectively provided on the output gear 303 by means of the same rotational amplitude of the output member 4 as the output gear 303. The position feedback member 5 is a positioning rod, the positioning rod is fixed at the non-tooth center of the output gear 303, and the positioning rod is inserted into the track groove 703, so that the positioning rod performs eccentric movement, and further, the movement of the positioning rod against the limiting member 6 is realized.

Example IV

This embodiment is similar to the third embodiment, except that: the output part 4 is a rotary output shaft, the rotary output shaft is in transmission connection with a valve rod on the flow meter so as to achieve the function of controlling the flow meter, the position feedback piece 5 is a positioning rod, the positioning rod is fixed at a non-rod center of the rotary output shaft, and the positioning rod is inserted into the track groove 703, so that the positioning rod can perform eccentric movement, and further the movement propped against the limiting member 6 is achieved.

Example five

In this embodiment, referring to fig. 1, 4 and 5, the housing assembly 1 includes an upper housing 101 and a lower housing 102, a screw hole 104 is provided in the upper housing 101, a fastener (such as a screw) is installed in the screw hole 104 to assemble the upper housing 101 and the lower housing 102 together, and the upper housing 101 is attached to the framework plate 7, so as to reduce the overall size of the actuator for subsequent assembly and use.

Further, a circle of concave area 103 is provided on the outer side of the upper housing 101, the screw hole 104 is provided at the concave area 103, and sealant is injected into the concave area 103. Firstly, can fill up the gap everywhere between upper casing 101 and lower casing 102 after the sealant is poured into, secondly, the setting of concave region 103 can significantly reduce the volume of encapsulating, under the circumstances of guaranteeing the leakproofness, reaches the effect of reduce cost.

With respect to the upper housing 101, the upper housing 101 is further provided with a relief area 105, and the position feedback member 5 can enter the relief area 105 to provide sufficient installation and movement space for the position feedback member 5.

Regarding the lower housing 102, a docking portion 106 is protruding from the lower end of the lower housing 102, a docking hole 1061 is formed in the docking portion 106, the output member 4 at least partially extends into the docking hole 1061, and a sheath 8 is disposed in the docking hole 1061. In use, the valve stem of the flow meter is inserted into the docking portion 106 and connected to the output member 4 to achieve a driven fit. At the same time, the existence of the sheath 8 and the butt joint part 106 can prevent the output part 4 and the valve rod from being exposed to the outside, thereby achieving better protection effect.

It should be noted that other technical solutions of the present utility model belong to the prior art, and are not described in detail.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the concept of the present utility model, and such modifications and adaptations are intended to be comprehended within the scope of the present utility model.

Claims

1. An anti-over-rotation electric actuator comprises a shell component (1), a motor (2), a speed reduction transmission component (3) and an output component (4), wherein the motor (2), the speed reduction transmission component (3) and the output component (4) are arranged in the shell component (1) and are sequentially connected in a transmission mode, and the motor (2) is electrically connected with a control circuit board;

the method is characterized in that: the transmission assembly or the output part (4) is fixedly provided with a position feedback piece (5), and the position feedback piece (5) at least has a full-open position state (5 a) and a full-closed position state (5 b);

a limiting component (6) is further arranged in the shell component (1), and the position feedback piece (5) is propped against the limiting component (6) and forms limiting fit when in a fully-opened position state (5 a) and a fully-closed position state (5 b);

when the position feedback piece (5) is propped against the limiting component (6), the instantaneous current of the motor (2) is increased, and the control circuit board controls the motor (2) to stop rotating after detecting the current increase.

2. The anti-over-rotation electric actuator of claim 1, wherein: the shell assembly (1) is divided into a first cavity (701) and a second cavity (702) through a skeleton plate (7), the motor (2) is arranged in the first cavity (701), the reduction transmission assembly (3) and the output component (4) are arranged in the second cavity (702), and the motor (2) is arranged in the first cavity (701).

3. The anti-over-rotation electric actuator of claim 2, wherein: the limiting component (6) is a track groove (703) formed in the skeleton plate (7), the position feedback piece (5) is inserted into the track groove (703) and forms clearance fit with the side wall of the track groove (703), and the position feedback piece (5) can abut against the head end and the tail end of the track groove (703) to form limiting fit.

4. The anti-over-rotation electric actuator of claim 3, wherein: the speed reduction transmission assembly (3) is a gear transmission assembly, the gear transmission assembly comprises an input gear (301), a plurality of stages of speed reduction gears (302) and an output gear (303), the output gear (303) is connected with the output component (4), and the position feedback piece (5) is arranged on the output gear (303).

5. The anti-over-rotation electric actuator of claim 4, wherein: the position feedback piece (5) is a positioning rod, the positioning rod is fixed at the non-tooth center of the output gear (303), and the positioning rod is inserted into the track groove (703).

6. The anti-over-rotation electric actuator of claim 3, wherein: the output part (4) is a rotary output shaft, the position feedback part (5) is a positioning rod, the positioning rod is fixed at a non-rod center of the rotary output shaft, and the positioning rod is inserted into the track groove (703).

7. The anti-over-rotation electric actuator of claim 2, wherein: the shell assembly (1) comprises an upper shell (101) and a lower shell (102), a screw hole (104) is formed in the upper shell (101), a fastener is arranged in the screw hole (104) so as to assemble the upper shell (101) and the lower shell (102) together, and the upper shell (101) is attached to the framework plate (7).

8. The anti-over-rotation electric actuator of claim 7, wherein: the outer side of the upper shell (101) is provided with a circle of concave area (103), the screw hole (104) is arranged at the concave area (103), and sealing glue is injected into the concave area (103).

9. The anti-over-rotation electric actuator of claim 7, wherein: the upper shell (101) is provided with an avoidance area (105), and the position feedback piece (5) can enter the avoidance area (105).

10. The anti-over-rotation electric actuator of claim 7, wherein: the lower end of the lower shell (102) is convexly provided with a butt joint part (106), the butt joint part (106) is provided with a butt joint hole (1061), the output part (4) at least partially stretches into the butt joint hole (1061), and the butt joint hole (1061) is internally provided with a sheath (8).