Electric push rod limit position control structure

Abstract

The utility model relates to the technical field of electric push rods, and discloses an electric push rod limit position control structure which comprises an outer pipe, a push rod movably arranged in the outer pipe in a penetrating mode, a motor driving the push rod to axially move relative to the outer pipe and a driving circuit structure driving the motor to rotate forwards or reversely. When the motor rotates forwards or backwards, the motor drives the push rod to move relative to the outer pipe; a control circuit structure for cutting off or connecting the driving circuit structure and the motor is connected in series between the motor and the driving circuit structure, and the control circuit structure, the driving circuit structure and the motor are independently arranged; the drive circuit structure can control the motor to rotate, the motor drives the push rod to move relative to the outer pipe, the control circuit structure is connected between the drive circuit structure and the motor in series and controls the drive circuit structure and the motor to be connected or disconnected, the control circuit structure, the drive circuit structure and the motor are independently arranged, maintenance is convenient, and the maintenance cost is low.

Description

TECHNICAL FIELD

[0001] The utility model discloses a technical field of electric push rod, specifically, relates to electric push rod limit position control structure. BACKGROUND

[0002] Electric push rod is also called linear driver, which converts the rotary motion of motor into the linear reciprocating motion of push rod, and can be used as an execution machine in various simple or complex process to realize remote control, centralized control or automatic control.

[0003] The electric push rod comprises an outer tube and a push rod arranged in the outer tube, and a motor drives the push rod to move relative to the outer tube through a transmission structure, so as to realize the linear driving of the push rod.

[0004] In the prior art, the movement of the push rod needs to be position-limited, that is, limited to the limit position. A rubber strip is arranged in the inner part of the outer tube, a travel switch is arranged on the rubber strip, and the travel switch is connected with the driving circuit structure by a wire, so that when the push rod moves to the limit position relative to the outer tube, the travel switch is contacted, and the driving circuit structure controls the motor to stop driving the push rod to move, thereby realizing the control of the limit position.

[0005] Since the limit position switching is realized by the travel switch, the control precision is low, and when a control fault occurs, since the travel switch and the control circuit structure are combined into an integral structure, the maintenance cost is high, and the maintenance difficulty is great, and the electric push rod can only be scrapped as a whole. CONTENT OF THE UTILITY MODEL

[0006] The utility model discloses an electric push rod limit position control structure, and aims to solve the problem of high maintenance cost of the electric push rod in the prior art.

[0007] The utility model discloses an electric push rod limit position control structure, and aims to solve the problem of high maintenance cost of the electric push rod in the prior art.

[0008] The control circuit structure, the driving circuit structure and the motor are arranged independently.

[0009] Further, the outer tube is provided with an inductor that sends a control signal to the control circuit structure and is non-contact, and when the push rod moves to the limit position relative to the outer tube, the inductor sends a control signal to the control circuit structure, and the control circuit structure disconnects the driving circuit structure and the motor.

[0010] Further, the control circuit structure comprises a circuit board arranged in the inner tube.

[0011] Further, the inductor is arranged in the outer tube and electrically connected with the circuit board.

[0012] Further, the inductor comprises a wireless inductor part, when the push rod moves to the limit position relative to the outer tube, the wireless inductor part sends a control signal to the control circuit structure, and the control circuit structure disconnects the driving circuit structure from the motor.

[0013] Further, the wireless inductor part comprises an infrared emitter.

[0014] Further, the wireless inductor part comprises a laser emitter.

[0015] Further, the electric push rod limit position control structure comprises a base, the base has an outwardly arranged front surface, the motor and the outer tube are connected on the front surface of the base in parallel, the motor is connected with a transmission structure, the transmission structure is connected with the push rod, and the motor drives the push rod to move relative to the outer tube through the transmission structure.

[0016] Further, the transmission structure comprises a driving gear plate and a driven gear plate, the motor has a rotating shaft, the rotating shaft is connected with the driving gear plate, and the driving gear plate is engaged with the driven gear plate.

[0017] A lead screw is arranged in the push rod, the lead screw is threadedly connected with the push rod, and the lead screw is fixedly connected with the driven gear plate; when the motor drives the rotating shaft to rotate, the driving gear plate drives the driven gear plate to rotate, the lead screw synchronously rotates with the driven gear plate, and the push rod synchronously moves relative to the outer tube.

[0018] Further, the base has an inwardly arranged back surface, the back surface is arranged away from the front surface, and a fixing seat for external fixing connection is arranged on the back surface, and the fixing seat is arranged away from the outer tube.

[0019] Compared with the prior art, the electric push rod limit position control structure can control the motor to rotate, so that the motor drives the push rod to move relative to the outer tube, the control circuit structure is connected in series between the driving circuit structure and the motor, the driving circuit structure and the motor can be connected or disconnected, so as to realize whether the motor drives the push rod, and the control circuit structure, the driving circuit structure and the motor are arranged independently, so that the maintenance is facilitated, and the maintenance cost is low. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1It is the cutting schematic view of the electric push rod limit position control structure provided by the utility model.

[0021] Figure 2 It is the principle schematic view of the electric push rod limit position control structure provided by the utility model.

[0022] Figure 3 It is the flow schematic view of the electric push rod limit position control structure provided by the utility model.

[0023] Figure 4 It is the circuit structure view of the control circuit structure. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the utility model more clear and intelligible, the utility model is further described in detail below in combination with the drawings and examples.

[0025] The implementation of the utility model is described in detail below in combination with specific examples.

[0026] The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the utility model, it should be understood that if the terms "upper", "lower", "left", "right" and the like indicate the orientation or positional relationship shown in the drawings, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the positional relationship in the drawings are only used for exemplary illustration, and cannot be understood as a limitation on the patent, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0027] Referring to Figures 1-4 The preferred embodiment provided by the utility model.

[0028] The electric push rod limit position control structure comprises an outer tube 300, a push rod 400 movably arranged in the outer tube 300, a motor 200 for driving the push rod 400 to move axially relative to the outer tube 300, and a drive circuit structure 201 for driving the motor 200 to rotate forward or reverse, the drive circuit structure 201 is electrically connected with a power supply, when the motor 200 rotates forward or reverse, the motor 200 drives the push rod 400 to move relative to the outer tube 300.

[0029] When the motor 200 rotates forward, the push rod 400 extends forward relative to the outer tube 300, and when the motor 200 rotates reversely, the push rod 400 reversely retracts relative to the outer tube 300. The control circuit structure 301 is connected in series between the motor 200 and the driving circuit structure 201, and is used to cut off or connect the driving circuit structure 201 and the motor 200.

[0030] The limit position control structure of the electric push rod provided above can control the rotation of the motor 200, so that the motor 200 drives the push rod 400 to move relative to the outer tube 300. The control circuit structure 301 is connected in series between the driving circuit structure 201 and the motor 200, and is used to control the connection or cutting off of the driving circuit structure 201 and the motor 200, so as to control whether the motor 200 drives the push rod 400. In addition, the control circuit structure 301, the driving circuit structure 201 and the motor 200 are arranged independently, which is convenient for maintenance and has low maintenance cost.

[0031] For example, when the control structure fails, the control circuit structure 301 can be directly replaced as a whole. Of course, the control circuit structure 301 can be electrically connected to the driving circuit structure 201 and the motor 200 through a plug-in connection structure, so as to facilitate the overall replacement during maintenance.

[0032] In the embodiment, the driving circuit structure 201 is a conventional design, for example, the control for starting or stopping the motor 200 in the prior art, which will not be described here. The control circuit structure 301 is shown in Figure 4 .

[0033] In the embodiment, the outer tube 300 is provided with an inductor 302 which sends a control signal to the control circuit structure 301 in a non-contact manner. When the push rod 400 moves to the limit position relative to the outer tube 300, the inductor 302 sends a control signal to the control circuit structure 301, and the control circuit structure 301 cuts off the connection between the driving circuit structure 201 and the motor 200.

[0034] The inductor 302 is a non-contact element, which does not need to use mechanical touch, and greatly improves the control accuracy.

[0035] The motor 200 control circuit is connected in series between the driving circuit and the motor 200, the driving circuit structure 201 supplies power to the motor 200, the motor 200 works, and the push rod 400 extends or retracts relative to the outer tube 300. When the push rod 400 reaches the extension limit or retraction limit, the inductor 302 feeds back a signal to the control circuit structure 301, the control circuit structure 301 cuts off the connection between the driving circuit structure 201 and the motor 200, and the motor 200 stops working.

[0036] The control circuit structure 301 comprises a circuit board arranged inside the outer tube 300, so as to facilitate the arrangement of the control circuit structure 301. In the embodiment, the control circuit structure 301 comprises a bridge rectifier circuit, a motor 200 positive electrode sampling circuit, a relay driving circuit, a stabilizing circuit and the like arranged on the circuit board.

[0037] The inductor 302 is arranged in the outer tube 300 and electrically connected with the circuit board. The inductor 302 facilitates the detection of the movement of the push rod 400. The inductor 302 comprises a wireless inductor. When the push rod 400 moves to the limit position relative to the outer tube 300, the wireless inductor sends a control signal to the control circuit structure 301, and the control circuit structure 301 disconnects the driving circuit structure 201 from the motor 200.

[0038] In the embodiment, the wireless inductor comprises an infrared emitter. Alternatively, the wireless inductor comprises a laser emitter. The wireless inductor can be a Hall sensor, an infrared sensor or the like non-contact inductor 302.

[0039] In the embodiment, the electric push rod limit position control structure comprises the base 100. The base 100 has an outwardly arranged front surface. The motor 200 and the outer tube 300 are connected side by side on the front surface of the base 100. The motor 200 is connected with a transmission structure. The transmission structure is connected with the push rod 400. The motor 200 drives the push rod 400 to move relative to the outer tube 300 through the transmission structure.

[0040] The motor 200 is arranged on the same side of the outer tube 300, facilitating the installation and fixation of the base 100. The transmission structure can be diversified as long as it can achieve the transmission of the push rod 400.

[0041] In the embodiment, the transmission structure comprises a driving gear plate and a driven gear plate. The motor 200 has a rotating shaft. The rotating shaft is connected with the driving gear plate. The driving gear plate is engaged with the driven gear plate.

[0042] A lead screw is arranged in the push rod 400. The lead screw is threadedly connected with the push rod 400. The lead screw is fixedly connected with the driven gear plate. When the motor 200 drives the rotating shaft to rotate, the driving gear plate drives the driven gear plate to rotate. The lead screw synchronously rotates with the driven gear plate. The push rod 400 synchronously moves relative to the outer tube 300. The lead screw drives the push rod 400 to move, which can achieve higher-precision telescopic movement.

[0043] In the embodiment, the base 100 has an inwardly arranged back surface. The back surface is arranged away from the front surface. The back surface is provided with a fixing seat 101 for external fixation. The fixing seat 101 is arranged away from the outer tube 300. The fixing seat 101 facilitates the fixation of the base 100 with the outside.

[0044] In this embodiment, the push rod 400 has an end extending outside the outer tube 300, and the end is provided with a fixing hole to realize the connection of the push rod 400 with the outside.

[0045] In this embodiment, the control circuit structure includes diode D3, diode D4, diode D5, diode D6, diode D9, diode D10, resistor R5, resistor R6, resistor R9, resistor R10, resistor R11, resistor R12, NPN triode Q1, NPN triode Q2, NPN triode Q3, NPN triode Q4, NPN triode Q5, NPN triode Q6, and relay K1.

[0046] The negative electrode of the diode D3 is connected to the negative electrode M- of the power supply, the negative electrode of the diode D4 is connected to the positive electrode M+ of the power supply, the positive electrodes of the diode D9 and the diode D6 are connected to the positive electrode M+ of the power supply, the positive electrodes of the diode D5 and the diode D10 are connected to the negative electrode M- of the power supply, the positive electrode of the diode D9 is connected to the collector of the NPN triode Q4 and the base of the triode Q2 through the resistor R5, the emitters of the NPN triode Q2 and the NPN triode Q4 are connected to the ground GND, the positive electrode of the diode D9 is connected to the base of the NPN triode Q4 and the collector of the NPN triode Q6 through the resistor R9, the collector of the NPN triode Q6 is connected to the base of the NPN triode Q4, and the NPN triode Q6 is connected to the limit signal sampling circuit H-S2.

[0047] The signal of the limit signal sampling circuit H-S2 can be a voltage signal, and the signal of the limit signal sampling circuit H-S2 can be a current signal, the base of the NPN triode Q6 is connected to the ground GND through the resistor R11, the emitter of the NPN triode Q6 is connected to the ground GND, the positive electrode of the diode D10 is connected to the base of the NPN triode Q1 and the collector of the NPN triode Q3 through the resistor R6, and the positive electrode of the diode D10 is connected to the base of the NPN triode Q3 and the collector of the NPN triode Q5 through the resistor R10.

[0048] The base of the NPN triode Q5 is connected to the limit signal sampling circuit H-S1, the signal of the limit signal sampling circuit H-S1 can be a voltage signal, and the signal of the limit signal sampling circuit H-S1 can be a current signal. The base of the NPN triode Q5 is connected to the ground GND through the resistor R12, the emitter of the NPN triode Q5 is connected to the ground GND, the positive electrodes of the diode D5 and the diode D6 are connected to the positive end of the driving pin of the relay through the resistor R4, the collectors of the NPN triode Q2 and the triode Q1 are connected to the negative end of the driving pin of the relay, and the motor is connected in series to the switch pin of the relay K1.

[0049] When the motor is rotating forward, i.e. M+ is connected to the positive pole of the power supply and M- is connected to the negative pole of the power supply, the positive pole M+ of the power supply is supplied with power through diode D9 and resistor R5 to the base of NPN transistor Q2, so that NPN transistor Q2 is turned on to ground GND, and the positive pole of the power supply is supplied with power through diode D9 and resistor R9 to the base of NPN transistor Q4, so that NPN transistor Q4 is turned on, and the base of the NPN transistor is connected to sampling circuit H-S2.

[0050] When the signal of the limit signal sampling circuit H-S2 is high, NPN transistor Q6 works in the switching state and is turned on, the collector of NPN transistor Q6 is turned off to ground GND, and the collector of NPN transistor Q6 is connected to the base of NPN transistor Q4, NPN transistor Q4 works in the switching state and is turned off, and NPN transistor Q2 works in the turned-on state, so that the positive pole M+ of the power supply is supplied with power through diode D6 and resistor R4 to the driving end of relay K1, so that the relay switch is in the closed state, and the motor is normally operated.

[0051] When the signal of the limit signal sampling circuit H-S2 is low, NPN transistor Q6 works in the switching state and is turned off, the collector of NPN transistor Q6 is turned on to ground GND, and the collector of NPN transistor Q6 is connected to the base of NPN transistor Q4, NPN transistor Q4 works in the switching state and is turned on, and NPN transistor Q2 works in the turned-off state, so that the relay K1 switch is in the open state, the motor power is disconnected, and the motor is in the non-working state.

[0052] When the motor is rotating backward, i.e. M- is connected to the positive pole of the power supply and M+ is connected to the negative pole of the power supply, the positive pole M- of the power supply is supplied with power through diode D10 and resistor R6 to the base of NPN transistor Q1, so that NPN transistor Q1 is turned on to ground GND, and the positive pole of the power supply is supplied with power through diode D10 and resistor R10 to the base of NPN transistor Q3, so that NPN transistor Q3 is turned on to ground GND, and the base of the NPN transistor is connected to sampling circuit H-S1, when the signal of the limit signal sampling circuit H-S1 is high, NPN transistor Q5 works in the switching state and is turned on, the collector of NPN transistor Q5 is turned on to ground GND, and the collector of NPN transistor Q5 is connected to the base of NPN transistor Q3, NPN transistor Q3 works in the switching state and is turned off, and NPN transistor Q1 works in the turned-on state, so that the positive pole M+ of the power supply is supplied with power through diode D5 and resistor R4 to the driving end of relay K1, so that the relay switch is in the closed state, and the motor is normally operated.

[0053] When the limit signal sampling circuit H-S1 signal is low level, the NPN transistor Q5 works in switch state and conducting state, the NPN transistor Q5 collector pair ground GND is high level, the NPN transistor Q5 collector is connected to the NPN transistor Q3 base, the NPN transistor Q3 works in switch state and conducting state, and because the NPN transistor Q3 works in switch state and conducting state, the NPN transistor Q1 works in cut-off state, so that the relay K1 switch is in the open state, the motor power is disconnected, and the motor is in the non-working state.

[0054] The above merely describes the preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electric push rod limit position control structure, characterized by, The electric push rod limit position control structure comprises a base, the base has an outwardly arranged front face, the motor and the outer tube are connected side by side on the front face of the base, the motor is connected with a transmission structure, the transmission structure is connected with the push rod, and the motor drives the push rod to move relative to the outer tube through the transmission structure. The motor and the driving circuit structure are connected in series with a control circuit structure for cutting off or connecting the driving circuit structure and the motor, and the control circuit structure, the driving circuit structure and the motor are arranged independently.

2. The electric push rod limit position control structure according to claim 1, wherein The outer tube is provided with a non-contact inductor for sending a control signal to the control circuit structure, and when the push rod moves to the limit position relative to the outer tube, the inductor sends a control signal to the control circuit structure, and the control circuit structure cuts off the connection of the driving circuit structure and the motor.

3. The electric push rod limit position control structure according to claim 2, wherein The control circuit structure comprises a circuit board arranged in the inner part of the outer tube.

4. The electric push rod limit position control structure according to claim 3, wherein The inductor is arranged in the outer tube and is electrically connected with the circuit board.

5. The electric push rod limit position control structure according to claim 2, wherein The inductor comprises a wireless inductor, and when the push rod moves to the limit position relative to the outer tube, the wireless inductor sends a control signal to the control circuit structure, and the control circuit structure cuts off the connection of the driving circuit structure and the motor.

6. The electric push rod limit position control structure according to claim 5, wherein The wireless inductor comprises an infrared emitter.

7. The electric push rod limit position control structure according to claim 5, wherein The wireless inductor comprises a laser emitter.

8. The electric push rod limit position control structure according to any one of claims 1 to 7, characterized in that, The electric push rod limit position control structure comprises a base, the base has an outwardly arranged front face, the motor and the outer tube are connected side by side on the front face of the base, the motor is connected with a transmission structure, the transmission structure is connected with the push rod, and the motor drives the push rod to move relative to the outer tube through the transmission structure.

9. The electric push rod limit position control structure according to claim 8, wherein The transmission structure comprises a driving gear plate and a driven gear plate, the motor has a rotating shaft, the rotating shaft is connected with the driving gear plate, and the driving gear plate is engaged with the driven gear plate. A screw rod is arranged in the push rod, the screw rod is threadedly connected with the push rod, and the screw rod is fixedly connected with the driven gear plate; when the motor drives the rotating shaft to rotate, the driving gear plate drives the driven gear plate to rotate, the screw rod rotates synchronously with the driven gear plate, and the push rod moves synchronously relative to the outer tube.

10. The electric push rod limit position control structure according to claim 8, wherein The base has an inwardly arranged back face, the back face is arranged away from the front face, and a fixing seat for external fixing connection is arranged on the back face, and the fixing seat is arranged away from the outer tube.

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