CN218472886U

CN218472886U - Electric push-pull mechanism

Info

Publication number: CN218472886U
Application number: CN202222328096.7U
Authority: CN
Inventors: 马戎
Original assignee: Shenzhen Rongma Yisheng Technology Co ltd
Current assignee: Shenzhen Rongma Yisheng Technology Co ltd
Priority date: 2022-08-31
Filing date: 2022-08-31
Publication date: 2023-02-10
Anticipated expiration: 2032-08-31

Abstract

The utility model relates to the technical field of electric push-pull devices, and discloses an electric push-pull mechanism with multistage stroke control and low cost, which comprises a mounting bracket, a driving unit and a control unit, wherein the mounting bracket is provided with a guide rod which is slidably sleeved with a motion bracket; the driving unit comprises a motor, a power supply, a screw rod connected with the motor and a transmission part provided with a positioning piece, in threaded connection with screw rod threads and connected with the moving support; the control unit comprises a control circuit board and a plurality of groups of photoelectric correlation assemblies which are arranged in rows and electrically connected with the control circuit board, correlation areas are formed between transmitting tubes and receiving tubes of the photoelectric correlation assemblies, stroke areas are formed between adjacent photoelectric correlation assemblies, and the correlation areas and the stroke areas form induction channels; the tail end of the positioning piece is inserted into the induction channel and moves along the induction channel to shield or leave the opposite-incidence area; the transmission part shields a stroke position of the photoelectric correlation component corresponding to the moving support; when the level of the photoelectric correlation component corresponding to the preset stroke position changes, the motor is controlled to rotate reversely.

Description

Electric push-pull mechanism

Technical Field

The utility model relates to an electronic push-and-pull technical field especially relates to an electronic push-and-pull mechanism that can realize multistage stroke control, low cost.

Background

For consumer electronics products with an electric push-pull function, such as electric tools (e.g., electric drills), electric toys, smart homes, or massagers (e.g., fascial guns), the push-pull function of the products is usually achieved by using a scheme of combining a motor and a reversing transmission device, wherein the motor generally adopts a direct current brush motor, a direct current brushless motor, a stepping motor, a servo motor or the like to provide rotary power output, and the reversing transmission device adopts a crankshaft transmission or screw transmission mode to convert rotary motion of the motor into linear push-pull motion.

However, the dc brush/brushless motor rotates continuously after being energized, and cannot precisely control the angular position of the output of the motor, that is, the linear position of the output mechanism in real time cannot be precisely controlled after the linear push-pull motion reversing transmission device is superimposed. Although the stepping motor or the servo motor can accurately control the output stroke of the product and realize the multi-stage stroke control of the product, the cost is high, and the development difficulty and the size of a control system are large, so that the stepping motor or the servo motor is difficult to popularize and apply in consumer electronic products with high requirements on the aspects of mass production cost, development cost, size, portability and the like.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is desirable to provide an electric push-pull mechanism that can realize multistage stroke control and is low in cost.

An electric push-pull mechanism comprising:

the mounting bracket is fixedly provided with a guide rod, and the guide rod is sleeved with a moving bracket in a sliding manner;

the driving unit comprises a motor arranged on the mounting bracket, a power supply electrically connected with the motor and supplying power to the motor, a screw rod connected with the output end of the motor and driven by the motor to rotate, and a transmission part in threaded connection with the screw rod and capable of reciprocating along the length direction of the screw rod, wherein the transmission part is fixedly connected with the moving bracket and is provided with a positioning part; and

the control unit comprises a plurality of groups of photoelectric correlation components which are arranged in a row at intervals along the moving direction of the moving support, a correlation area is formed between a transmitting tube and a receiving tube of each group of photoelectric correlation components, a stroke area is formed between two adjacent groups of photoelectric correlation components, and the correlation area and the stroke area jointly form a sensing channel; the free end of the positioning piece is inserted into the induction channel and moves in the induction channel under the driving of the transmission piece so as to shield or leave the opposite-shooting area; when the transmission part shields the group of photoelectric correlation components, the transmission part corresponds to one stroke position of the moving support;

the control unit further comprises a control circuit board used for controlling the motor to rotate reversely when the level of the photoelectric correlation assembly corresponding to the preset stroke position changes, and the control circuit board is used for bearing a plurality of groups of photoelectric correlation assemblies and is respectively and electrically connected with each group of photoelectric correlation assemblies.

In one embodiment, the optoelectronic correlation assembly is disposed on the control circuit board at a side adjacent to the positioning member.

In one embodiment, the photoelectric correlation component is arranged on the control circuit board on a side surface back to the positioning element, a guide hole communicated with the induction channel is formed in a position, corresponding to the induction channel, on the control circuit board, and the tail end of the positioning element penetrates through the guide hole and is inserted into the induction channel.

In one embodiment, the mounting bracket comprises an arc-shaped fixing plate, a motor mounting shell connected with the convex arc surface of the arc-shaped fixing plate, two power supply mounting plates arranged at two sides of the motor mounting shell and respectively fixedly connected with the convex arc surface of the arc-shaped fixing plate and the motor mounting shell, and an insertion pipe arranged between the motor mounting shell and the power supply mounting plates;

set up the cross-under hole that extends along arc fixed plate length direction on the arc fixed plate, the motor is acceptd in motor installation shell, the lead screw is worn to establish motor installation shell and is connected with motor drive, the power is fixed on the power mounting panel, the intubate respectively with arc fixed plate, motor installation shell and power mounting panel fixed connection, the guide bar is inserted and is located in the intubate, the motion support is acceptd in the region that arc fixed plate's concave cambered surface encloses, and the bottom of motion support is equipped with the stabilizer blade that wears to establish the cross-under hole and cup joint with the guide bar slip.

In one embodiment, the motor mounting shell is positioned at one end of the arc-shaped fixed plate and is fixedly connected with the arc-shaped fixed plate, the mounting bracket further comprises a sealing plate which is positioned at the other end of the arc-shaped fixed plate and is respectively and fixedly connected with the motor mounting shell and the power supply mounting plate, the sealing plate, the motor mounting shell and the power supply mounting plate jointly enclose a sliding area, and the screw rod, the transmission part and the positioning part are accommodated in the sliding area; the photoelectric correlation subassembly sets up on control circuit board when a side of back to the setting element, offers the jack with the guiding hole intercommunication on the shrouding.

In one embodiment, the transmission piece comprises a nut in threaded fit with the screw rod, a limiting plate fixedly connected with the nut and a positioning piece fixed on the limiting plate; the outer surface of one end, far away from the insertion tube, of the moving support is provided with a lug, the lug is provided with a slot, and the limiting plate is inserted into the slot and is in limiting fit with the moving support.

In one embodiment, the limiting plate is further connected with the lug screw or pin.

In one embodiment, the positioning member comprises a light blocking part which faces away from the limiting plate and blocks or leaves the opposite-incidence area.

In one embodiment, the electric push-pull mechanism further comprises a positioning end cover, the positioning end cover is located at one end, opposite to the insertion pipe, of the mounting bracket and is fixedly connected with the sealing plate and the power supply mounting plate respectively, and a first limiting slot used for inserting the tail end of the guide rod and a second limiting slot used for rotatably inserting the tail end of the lead screw are formed in the positioning end cover.

In one embodiment, a bearing sleeve is arranged in the second limiting slot, and a bearing matched with the tail end of the screw rod is arranged on the bearing sleeve.

Implement the utility model discloses an electronic push-and-pull mechanism, set up multiunit photoelectricity correlation subassembly on control circuit board in order to form the response passageway of constituteing by correlation region and stroke region, and set up the setting element on the driving medium with lead screw thread fit, rotate through the motor drive lead screw, the driving medium will drive the setting element and remove in the response passageway in order to shelter from or leave the correlation region, when electronic push-and-pull mechanism sets up to different stroke position during operation, control circuit board is after the change signal of telecommunication of receiving the photoelectricity correlation subassembly transmission that corresponds with corresponding stroke position, control motor antiport, so, only need choose for use the direct current to have brush/brushless motor this type low-cost motor, can realize the accurate control to the multistage formation of electronic push-and-pull mechanism, the production and use cost of electronic push-and-pull mechanism have been reduced.

Drawings

Fig. 1 is a schematic structural view of an electric push-pull mechanism according to an embodiment of the present invention;

fig. 2 is a schematic structural view of the electric push-pull mechanism according to an embodiment of the present invention after the housing is removed;

fig. 3 is an exploded view of the electric push-pull mechanism according to an embodiment of the present invention;

FIG. 4 is an enlarged partial view of the portion A in the embodiment shown in FIG. 3;

fig. 5 is a schematic view of a mounting bracket according to an embodiment of the present invention;

fig. 6 is a schematic structural view of another perspective of the mounting bracket according to an embodiment of the present invention;

fig. 7 is a schematic structural view of a motion bracket according to an embodiment of the present invention;

fig. 8 is a schematic circuit diagram of a main control circuit according to an embodiment of the present invention;

fig. 9 is a schematic circuit diagram of a transmitting circuit in an embodiment of the present invention;

fig. 10 is a schematic circuit diagram of a receiving circuit according to an embodiment of the present invention;

fig. 11 is a schematic circuit diagram of a switching circuit according to an embodiment of the present invention.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.

Please combine fig. 1 to fig. 3, the utility model discloses a can realize multistage stroke control, low-cost electronic push-pull mechanism 10, this electronic push-pull mechanism 10 is based on the mode that screw drive and photoelectricity geminate transistor location combine, realized having the ordinary low-cost direct current brush/brushless motor as drive power, realize the accurate controllable rectilinear push-pull motion of real-time motion position, specifically through setting up the multiunit photoelectricity correlation subassembly that corresponds different stroke gears, the level that produces when the photoelectricity signal according to the photoelectricity correlation subassembly of specific position is blocked changes, judge the position of motion support, and then control circuit board 410 control motor reversal, make electronic push-pull mechanism 10 under the stroke gear of predetermineeing, control circuit board 410 controls motor 310 reciprocating motion in the region between stroke position that the stroke gear corresponds and the initial position all the time, so, through adjusting the stroke gear of control circuit board 410 input, can realize the control of the multistage stroke of electronic push-pull mechanism 10, in this mechanism, need not to carry out programming setting to the motor, can be used ordinary low-cost direct current motor, be favorable to reducing the production and the use cost of electronic push-pull mechanism 10, and relevant product.

The utility model discloses an electronic push-and-pull mechanism 10 can be used to electric drill, electronic first electric tool of wholesale, also can be used to intelligent house products such as alarm clock, still can be used to electronic products such as manadesma rifle or other massagers and electronic toy, and it has a plurality of different stroke gears, and in every different stroke gear, the push-and-pull part (the motion support promptly) of electronic push-and-pull mechanism 10 is at the stroke range reciprocating motion of predetermineeing to export vibration drive power outward. Specifically, referring to fig. 1 to 4, the electric push-pull mechanism 10 includes a housing 100, a mounting bracket 200, a driving unit 300, and a control unit 400, wherein the housing 100 is surrounded by an upper half-shell 110 and a lower half-shell 120, the upper half-shell 110 and the lower half-shell 120 are connected by a snap-fit connection or a screw connection, a mounting space is provided between the upper half-shell 110 and the lower half-shell 120, and the mounting bracket 200, the driving unit 300, and the control unit 400 are all accommodated in the mounting space. The mounting bracket 200 is fixedly provided with a guide rod 210, the guide rod 210 is slidably sleeved with a moving bracket 220, the mounting bracket 200 is used for providing a framework of the electric push-pull mechanism 10 and supporting the driving unit 300 and the control unit 400, and the moving bracket 220 is used as an output part of the electric push-pull mechanism 10 and used for mounting a part to be vibrated or directly used as a vibrating part.

The driving unit 300 includes a motor 310 disposed on the mounting bracket 200, a power source 320 electrically connected to the motor 310 and supplying power to the motor 310, a lead screw 330 connected to an output end of the motor 310 and driven by the motor 310 to rotate, and a transmission member 340 threadedly connected to the lead screw 330 and reciprocating along a length direction of the lead screw 330, wherein the transmission member 340 is fixedly connected to the moving bracket 220, and a positioning member 350 is disposed on the transmission member 340. In this embodiment, the motor 310 is a dc brush motor or a dc brushless motor, the motor 310 may be used to directly drive the screw 330 to rotate, or the power may be transmitted to the screw 330 after speed change by a speed change device such as a gear set. Preferably, a motor gearbox (reduction gear set) engaged by a plurality of gears is further disposed between the output end of the motor 310 and the screw rod 330, and is used for adjusting the rotation speed of the screw rod 330, and further adjusting the vibration frequency of the motion bracket 220.

The control unit 400 includes a plurality of sets of photo-electric correlation assemblies arranged in a row at intervals along the moving direction of the moving support 220, and a correlation area is formed between the transmitting tube 420 and the receiving tube 430 of each set of photo-electric correlation assembly, in this embodiment, the transmitting tube 420 and the receiving tube 430 are an infrared transmitting tube and an infrared receiving tube respectively, a stroke area is formed between two adjacent sets of photo-electric correlation assemblies, and each correlation area and the stroke area jointly form a sensing channel 440; the free end of the positioning member 350 is inserted into the sensing channel 440 and moves in the sensing channel 440 under the driving of the transmission member 340 to block or leave the opposite-emitting area; when the transmission member 340 shields a group of photoelectric correlation components, a stroke position of the motion bracket 220 is corresponded; the control unit 400 further includes a control circuit board 410 for controlling the motor to rotate reversely when the level of the photo-electric correlation component corresponding to the preset stroke position changes, and the control circuit board 410 receives a plurality of sets of photo-electric correlation components and is electrically connected to each set of photo-electric correlation components 410. When the positioning member 350 moves linearly along with the moving rack 220, the optical path (i.e., the correlation area) of each set of the photo-electric correlation components can be cut off, so that the control circuit board 410 can determine the real-time position of the moving rack 220 by detecting the working state (level signal transmitted by the receiving tube 430) of the receiving tube 430 of each photo-electric correlation component in real time. In this embodiment, the control circuit board 410 may be a single piece, or may be a plurality of sub circuit boards separately disposed, so as to adapt to the structure of the electric push-pull mechanism 10, and it only needs to ensure that at least one sub circuit board is adjacent to the transmission member 340 on the moving bracket 220, and the plurality of sets of the optical-electrical correlation components are disposed on the sub circuit board.

In addition, the plurality of control buttons 130 are arranged on the housing 100 of the electric push-pull mechanism 10, and by pressing the control buttons 130, the level of the preset pins on the control circuit board 410 can be triggered to change, that is, a start-stop signal or a stroke level adjustment signal is sent to the control circuit board 410, so that when the level of the pins representing the state of the photoelectric correlation assembly associated with the pins corresponding to the stroke level on the control circuit board 410 changes, the control circuit board 410 judges that the moving support 220 reaches the preset position.

In the above-mentioned electric push-pull mechanism 10, a plurality of sets of photoelectric correlation components are disposed on the control circuit board 410 to form a sensing channel 440 composed of a correlation region and a stroke region, and the positioning member 350 is disposed on the transmission member 340 in threaded fit with the lead screw 330, the lead screw 330 is driven to rotate by the motor 310, the transmission member 340 drives the positioning member 350 to move in the sensing channel 440 to shield or leave the correlation region, when the electric push-pull mechanism 10 is set to work at different stroke positions, the control circuit board 410 controls the motor 310 to rotate in the opposite direction after receiving a change electric signal sent by the photoelectric correlation component corresponding to the corresponding stroke position, so that the electric push-pull mechanism 10 moves in the region between the initial position and the preset stroke position after being set to the preset stroke position. In this embodiment, the corresponding travel position when the alignment area of the first or last group of the plurality of groups of the photo-electric alignment assemblies is blocked by the positioning element 350 is set as the initial position.

Referring to fig. 3-6, the mounting bracket 200 includes an arc-shaped fixing plate 230, a motor mounting case 240 connected to the convex arc surface of the arc-shaped fixing plate 230, two power mounting plates 250 disposed at both sides of the motor mounting case 240 and fixedly connected to the convex arc surface of the arc-shaped fixing plate 230 and the motor mounting case 240, respectively, and an insertion tube 260 disposed between the motor mounting case 240 and the power mounting plates 250. In this embodiment, the arc fixing plate 230 is a plate with an upward opening and a circular arc-shaped cross section, the convex arc surface of the arc fixing plate 230 is the outer side of the opening of the arc fixing plate 230, and the concave arc surface of the arc fixing plate 230 is the inner side of the opening of the arc fixing plate 230. The portion of the motion frame 220 adjacent to the arc-shaped fixing plate 230 is of an arc surface structure, for example, the motion frame 220 is of a tubular structure, and when the motion frame 220 is of a tubular structure, the interface of the motion frame 220 may also be of different shapes, for example, an assembly bayonet 221 is provided at the interface of the motion frame 220 to adapt to various application structural components, for example, an electric tool bit with a corresponding interface shape is clamped into the assembly bayonet 221, or a cup-shaped cavity with a cushion at the head and an adaptive shape is installed into the assembly bayonet 221, so that an electric pneumatic cupping cup can be formed. The motor mounting case 240 is located at one end of the arc-shaped fixing plate 230 and is fixedly connected to the arc-shaped fixing plate 230, the motor mounting case 240 is located in the middle of the outer side of the opening of the arc-shaped fixing plate 230, that is, is connected to the outer side of the lowest point on the arc-shaped fixing plate 230, and the motor mounting case 240 has a cylindrical structure adapted to the shape of the motor 310.

The arc fixing plate 230 is provided with a through hole 231 extending along the length direction of the arc fixing plate 230, the through hole 231 may penetrate through the end surface of the arc fixing plate 230, and of course, the through hole 231 may not penetrate through the end surface of the arc fixing plate 230 when the movement of the motion bracket 220 is allowed. It should be noted that the motor 310 and the guide bar 210 are both mounted on the mounting bracket 200 to ensure that the moving bracket 220 moves linearly on the track defined by the screw 330 and the guide bar 210. The motor 310 is accommodated in the motor mounting shell 240, in this embodiment, the motor 310 is stably clamped in the motor mounting shell 240, the front end cover of the gearbox of the motor 310 or the motor 310 is provided with a screw positioning hole, and the screw rod 330 and the connecting body of the motor 310 are further fastened on the motor mounting shell 240 through screws, so as to prevent the motor 310 from loosening during operation. The screw 330 penetrates through the motor mounting case 240 and is connected with the motor 310 in a driving manner, the power source 320 is fixed on the power source mounting plates 250, in this embodiment, two power source mounting plates 250 are respectively provided with one power source 320, so as to ensure that the electric push-pull mechanism has enough electric quantity.

The insertion tube 260 is respectively fixedly connected with the arc-shaped fixing plate 230, the motor mounting case 240 and the power supply mounting plate 250, the guide rod 210 is inserted into the insertion tube 260, the moving bracket 220 is accommodated in an area defined by the concave arc surface of the arc-shaped fixing plate 230, and the bottom of the moving bracket 220 is provided with a support leg 222 penetrating through the through hole 231 and slidably sleeved with the guide rod 210. In this embodiment, two support legs 222 are symmetrically disposed at the bottom of the moving bracket 220, a circular hole is disposed on each support leg 222, two through holes 231 are spaced apart from each other on the arc-shaped fixing plate 230, two insertion tubes 260 are disposed on two sides of the motor mounting housing 240, a guide rod 210 is inserted into each of the two insertion tubes 260, and each support leg 222 on the moving bracket 220 correspondingly penetrates through one through hole 231 and is sleeved on one guide rod 210, so as to achieve sliding connection between the moving bracket 220 and the guide rod 210. It should be noted that, the support legs 222 at the bottom of the moving rack 220 may be directly punched, or a fixed shaft sleeve assembly may be assembled at the bottom of the moving rack 220, in this embodiment, the moving rack 220 is formed by POM wear-resistant material, so that holes are directly punched on the support legs 222, in practice, an additional wear-resistant assembly with holes may be assembled to achieve the same function, that is, to support the moving rack 220 to prevent it from rotating and wear-resistant relative to the guide bar 210. In addition, it should be emphasized that, during the process that the screw rod 330 and the transmission member 340 rotate relatively to drive the motion bracket 220 to reciprocate, the screw rod 330 will generate a torsional force to the motion bracket 220 along the rotation direction of the screw rod 330, and by providing the guide rod 210, on one hand, positioning, guiding and supporting of the motion bracket 220 are achieved, and the screw rod 330 is prevented from being broken or damaged due to overload, and on the other hand, the motion bracket 220 is prevented from rotating, so as to ensure the reliability of motion control of the motion bracket 220.

In one embodiment, the mounting bracket 200 further includes a sealing plate 270 located at the other end of the arc-shaped fixing plate 230 and fixedly connected to the motor mounting shell 240 and the power mounting plate 250, respectively, the sealing plate 270, the motor mounting shell 240 and the power mounting plate 250 together enclose a sliding region, and the screw 330, the transmission member 340 and the positioning member 350 are accommodated in the sliding region; when the optoelectronic correlation assembly is disposed on the control circuit board 410 on a side opposite to the positioning element 350, the sealing plate 270 is provided with an insertion hole 271 communicating with the guide hole, the insertion hole 271 serves as a passage through which the end of the positioning element 350 passes, so that when the moving bracket 220 and the transmission member 340 drive the positioning element 350 to move, the end of the positioning element 350 can move in the sensing passage 440, thereby shielding a correlation area between the transmitting tube 420 and the receiving tube 430 of the optoelectronic correlation assembly when moving to a predetermined stroke position.

It should be noted that the transmission member 340 may be disposed separately from the moving bracket 220, or the transmission member 340 and the moving bracket 220 may be an integrated structure, and of course, the transmission member 340 may also be a part of the moving bracket 220, for example, a protrusion is disposed at the bottom of the moving bracket 220, a threaded hole in threaded engagement with the screw 330 is formed in the protrusion, and the positioning member 350 is mounted at the bottom of the protrusion. Referring to fig. 3 and 7, when the transmission member 340 and the moving bracket 220 are separately disposed, the transmission member 340 includes a nut in threaded engagement with the screw 330, a limiting plate fixedly connected to the nut, and a positioning member 350 fixed on the limiting plate; the outer surface of the end, far away from the insertion tube 260, of the moving support 220 is provided with a lug 223, the lug 223 is provided with a slot 224, and the limiting plate is inserted into the slot 224 and is in limiting fit with the moving support 220, so that when the transmission piece 340 moves on the screw 330, the moving support 220 can be driven to move through the matching of the limiting plate and the inner wall of the slot 224, and the moving support 220 is driven. Further, the limiting plate still with lug 223 screwed connection or pin joint to further improve the stability that driving medium 340 and motion bracket 220 are connected, avoid motion bracket 220 to produce at the vibration in-process and rock.

In this embodiment, the positioning element 350 includes a light blocking portion facing away from the limiting plate and blocking or leaving the opposite-incidence region, for example, the positioning element 350 is designed to be an L-shaped structure, a transverse portion of the L-shaped structure of the positioning element 350 is fixedly connected to the transmission member 340, and a vertical portion of the L-shaped structure of the positioning element 350 serves as the light blocking portion and is used for blocking the opposite-incidence region of the photoelectric opposite-incidence assembly at the preset position. The positioning member 350 may be a hardware or plastic member disposed separately from the transmission member 340, or may be integrally formed with the motion bracket 220 or form a part of the motion bracket 220.

Further, the electric push-pull mechanism further comprises a positioning end cover 500, the positioning end cover 500 is located at one end of the mounting bracket 200, which is opposite to the insertion tube 260, and is respectively and fixedly connected with the sealing plate 270 and the power supply mounting plate 250, and the positioning end cover 500 is provided with a first limiting slot for inserting the tail end of the guide rod 210 and a second limiting slot for rotating the tail end of the insertion lead screw 330. Through setting up location end cover 500, can carry on spacingly to the end of guide bar 210, prevent that guide bar 210 from producing the drunkenness, in this embodiment, the end of lead screw 330 is equipped with the locating pin, and this locating pin is connected with the spacing slot pin of second. Furthermore, a bearing sleeve is arranged in the second limiting slot, and a bearing matched with the tail end of the screw rod 330 is arranged on the bearing sleeve and used for improving the wear-resisting property of the tail end of the screw rod 330.

In this embodiment, by integrating multiple sets of the optical-electrical correlation components on the control circuit board 410, each set of the optical-electrical correlation components includes the transmitting tube 420 and the receiving tube 430, preferably, when the electric push-pull mechanism works, the control circuit board detects whether the receiving tube 430 is irradiated by infrared rays to determine whether the optical path (i.e., the correlation area) of each set of the optical-electrical correlation components is cut off.

Please refer to fig. 8-11, the electric push-pull mechanism of this embodiment includes a main control circuit, a transmitting circuit, a receiving circuit and a switch circuit, which are disposed on a control circuit board, the main control circuit includes an MCU controller U5, the transmitting circuit includes an NMOS transistor Q5 for driving the transmitting transistor to operate, the current on-off of the NMOS transistor Q5 is controlled by the MCU controller U5 through a signal IR _ LED, an emitter signal of the receiving circuit is connected to an independent IO of the MCU controller U5, and the intensity of light absorbed by each receiving transistor can be determined through level change.

When the control button 130 is operated to send a signal to the MCU controller U5 on the control circuit board 410 so that the electric push-pull mechanism enters the M-range, the MCU controller U5 needs to receive a level-changing signal sent by the photoelectric correlation assembly corresponding to the M-range, when the positioning member 350 does not move to the set of photoelectric correlation assemblies, the receiving tube 430 of the set of photoelectric correlation assemblies can normally receive the infrared signal sent by the transmitting tube 420, the receiving tube 430 sends a high level signal to the control circuit board 410, when the positioning member 350 moves to the set of photoelectric correlation assemblies, the receiving tube 430 cannot receive the infrared signal sent by the transmitting tube 420 due to the blocking of the positioning member 350, the receiving tube 430 sends a low level signal to the control circuit board 410, so that the control circuit board 410 determines whether the moving bracket 220 moves to the preset stroke according to the change of the level signal sent by the receiving tube 430 of the photoelectric correlation assembly corresponding to the preset stroke position, and controls the control circuit board 410 to reverse the motor 310, so that the moving bracket 220 moves within the preset stroke range.

In this embodiment, the arrangement of the optical-electrical correlation component on the control circuit board 410 includes two arrangements, one is that the optical-electrical correlation component is arranged on the control circuit board 410 on a side surface adjacent to the positioning member 350 (as shown in fig. 3); secondly, the photoelectric correlation component is disposed on a side surface of the control circuit board 410 opposite to the positioning element 350, a guide hole communicated with the sensing channel 440 is disposed at a position of the control circuit board 410 corresponding to the sensing channel 440, and the end of the positioning element 350 penetrates through the guide hole and is inserted into the sensing channel 440.

The utility model discloses an electronic push-and-pull mechanism has following beneficial effect at least:

1. in the aspect of cost: in the electric push-pull mechanism, the motor 310 part can adopt a low-cost direct current brush motor or a direct current brushless motor, and the cost of single product or research and development is obviously reduced; the driving unit 300, the control unit 400 and other related core components can be compactly assembled on the same mounting bracket 200, so that the usage amount of plastic parts and the assembly cost can be effectively saved.

2. Controllable aspect of motion position: the electric push-pull mechanism is high in movement positioning precision, can realize real-time control of movement positions by matching with a motor 310 control system, and can effectively replace a high-cost large-size stepping motor system and a servo motor system in low-cost small-size application.

3. Development difficulty: compared with a stepping motor and a servo motor system, the development difficulty of the control circuit is smaller, and the product research and development period can be greatly shortened.

4. In terms of size: the mechanism adopts a direct current brush motor or a direct current brushless motor with more simplified size, and the requirements on a power supply 320 system and a motor 310 control system are correspondingly reduced, so the size of the whole machine can be smaller under the same function condition.

5. Performance aspects: compared with a direct current brush motor or a direct current brushless motor control system controlled by an open loop, the mechanism is a feedback control system with a real-time positioning function, and the motion control capability is remarkably improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims

1. An electric push-pull mechanism, comprising:

the control unit comprises a plurality of groups of photoelectric correlation components which are arranged in a row at intervals along the moving direction of the moving support, a correlation area is formed between a transmitting tube and a receiving tube of each group of photoelectric correlation components, a stroke area is formed between two adjacent groups of photoelectric correlation components, and the correlation area and the stroke area jointly form a sensing channel; the free end of the positioning piece is inserted into the induction channel and is driven by the transmission piece to move in the induction channel so as to shield or leave the opposite-shooting area; when the transmission part shields the group of photoelectric correlation components, the transmission part corresponds to one stroke position of the moving support;

the control unit further comprises a control circuit board used for controlling the motor to reversely rotate when the level of the photoelectric correlation assembly corresponding to the preset stroke position changes, and the control circuit board is used for bearing a plurality of groups of photoelectric correlation assemblies and is electrically connected with each group of photoelectric correlation assemblies respectively.

2. An electric push-pull mechanism according to claim 1, wherein the electro-optical correlation module is disposed on the control circuit board at a side adjacent to the positioning member.

3. An electric push-pull mechanism according to claim 2, wherein the photo-electric correlation component is disposed on a side of the control circuit board opposite to the positioning element, and a guiding hole communicated with the sensing channel is disposed at a position of the control circuit board corresponding to the sensing channel, and the end of the positioning element penetrates through the guiding hole and is inserted into the sensing channel.

4. An electric push-pull mechanism according to claim 2 or 3, wherein the mounting bracket comprises an arc-shaped fixing plate, a motor mounting shell connected with the convex arc surface of the arc-shaped fixing plate, two power supply mounting plates arranged at two sides of the motor mounting shell and fixedly connected with the convex arc surface of the arc-shaped fixing plate and the motor mounting shell respectively, and an insertion tube arranged between the motor mounting shell and the power supply mounting plates;

set up the cross-under hole that extends along arc-shaped fixing plate length direction on the arc-shaped fixing plate, the motor is acceptd in motor installation shell, the lead screw is worn to establish motor installation shell is connected with motor drive, the power is fixed on the power mounting panel, the intubate respectively with arc-shaped fixing plate, motor installation shell and power mounting panel fixed connection, the guide bar is inserted and is located in the intubate, the motion support is acceptd in the region that arc-shaped fixing plate's concave arc face encloses, and the bottom of motion support is equipped with wears to establish the cross-under hole and slides the stabilizer blade that cup joints with the guide bar.

5. An electric push-pull mechanism according to claim 4, wherein the motor mounting housing is located at one end of the arc-shaped fixing plate and is fixedly connected with the arc-shaped fixing plate, the mounting bracket further comprises a sealing plate located at the other end of the arc-shaped fixing plate and is respectively fixedly connected with the motor mounting housing and the power supply mounting plate, the sealing plate, the motor mounting housing and the power supply mounting plate together enclose a sliding region, and the screw rod, the transmission member and the positioning member are accommodated in the sliding region; the photoelectric correlation subassembly sets up on control circuit board when a side of back to the setting element, offers the jack with the guiding hole intercommunication on the shrouding.

6. An electric push-pull mechanism according to claim 5, wherein the transmission member comprises a nut in threaded fit with the lead screw, a limiting plate fixedly connected with the nut, and a positioning member fixed on the limiting plate; the outer surface of one end, far away from the insertion tube, of the moving support is provided with a lug, the lug is provided with a slot, and the limiting plate is inserted into the slot and is in limiting fit with the moving support.

7. An electric push-pull mechanism according to claim 6, wherein the limiting plate is further connected with the lug by a screw or a pin.

8. An electric push-pull mechanism according to claim 7, wherein the positioning element comprises a light blocking part facing away from the position-limiting plate and blocking or leaving the opposite-emission area.

9. An electric push-pull mechanism according to claim 8, further comprising a positioning end cap, wherein the positioning end cap is located at an end of the mounting bracket facing away from the insertion tube and is fixedly connected to the sealing plate and the power supply mounting plate, and the positioning end cap is provided with a first limiting slot for inserting the tail end of the guide rod and a second limiting slot for rotatably inserting the tail end of the lead screw.

10. An electric push-pull mechanism according to claim 9, wherein a bearing sleeve is arranged in the second limiting slot, and a bearing matched with the tail end of the screw rod is arranged on the bearing sleeve.