Electric push-pull rod control circuit and electric push-pull rod

Abstract

The utility model discloses an electric push-pull rod control circuit and an electric push-pull rod, comprising an alternating current power supply which is a single-phase 220V alternating current power supply and converts alternating current into direct current through a rectifier bridge circuit; the rectifier bridge circuit is used for rectifying alternating current into direct current and providing a stable direct current power supply to drive the direct current motor; the direct current motor is connected to the output end of the rectifier bridge, and driving and stopping of the push-pull rod are achieved through a control circuit; the relay control circuit controls on-off of the direct current motor through a relay, starting and stopping of the push-pull rod are achieved, the relay is driven by a control coil, and the coil receives voltage signals from the rectifier bridge; the adjusting protection circuit is used for adjusting the magnitude of the current and the voltage so as to control the starting current and the working voltage of the direct current motor and control the action of the push-pull rod; and the overcurrent protection element adopts a positive temperature coefficient thermistor, so that the direct current motor or the circuit is prevented from being damaged due to overload.

Description

Technical Field

[0001] The utility model relates to the technical field of electric push-pull rods, in particular to an electric push-pull rod control circuit and an electric push-pull rod. Background Art

[0002] At present, the main driving methods of electric push rods on the market are single-phase AC 220V motors, three-phase AC 380V motors and DC 24V motors. The disadvantages are as follows:

[0003] AC motors have high power consumption, about 250W;

[0004] The motors heat up quickly and have a short working time, about 10 minutes;

[0005] Poor mechanical self-locking property and poor repeat positioning accuracy of the stroke;

[0006] Most use trapezoidal lead screws, with low transmission efficiency;

[0007] The DC 24V DC motor needs to be equipped with a DC power supply, with large losses. Summary of the Invention

[0008] The purpose of the utility model is to provide an electric push-pull rod control circuit and an electric push-pull rod to solve the problems raised in the above background art.

[0009] To achieve the above purpose, the utility model provides the following technical solution: An electric push-pull rod control circuit, comprising:

[0010] An AC power supply, the AC power supply is single-phase 220V, and the alternating current is converted into direct current through a rectifier bridge circuit;

[0011] A rectifier bridge circuit for rectifying alternating current into direct current to provide a stable DC power supply to drive a DC motor;

[0012] A DC motor, the DC motor is connected to the output end of the rectifier bridge, and the driving and stopping of the push-pull rod are realized through a control circuit;

[0013] A relay control circuit, which controls the on and off of the DC motor through a relay to realize the start and stop of the push-pull rod. The relay is driven by a control coil, and the coil receives a voltage signal from the rectifier bridge;

[0014] A surge regulation and protection circuit for regulating the magnitude of the voltage to control the working voltage of the DC motor and control the action of the push-pull rod;

[0015] An overcurrent protection element, the overcurrent protection element adopts a positive temperature coefficient thermistor. When the current is too large, the positive temperature coefficient thermistor rapidly increases to prevent the DC motor or the circuit from being damaged by overload;

[0016] The braking resistor R is used to immediately stop the operation of the DC motor (8) when the power is cut off.

[0017] Further, the AC power supply includes AC input terminals L1, L2, N. The terminals L1, L2, N of the AC power supply are connected to the rectifier bridge through switches K1, K2. The on / off control of the switches K1, K2 starts and stops the entire circuit. The power enters the two input terminals of the rectifier bridge through L11 and L12 respectively. The rectifier bridge circuit includes rectifier bridges V1, V2. The input of rectifier bridge V1 is connected to the terminals L1 and L2 of the AC power supply, and the input of rectifier bridge V2 is connected to the terminals L1 and L2 of the AC power supply. When a 220V voltage exists between L1 and N, it controls the forward rotation of the DC motor. When a 220V voltage exists between L2 and N, it controls the reverse rotation of the DC motor.

[0018] Further, the relay control circuit includes relays RY1, RY2. The coils of the relays are respectively connected to the positive poles of rectifier bridges V1, V2. The normally open contacts of the relays switch the voltages at both ends of the DC motor, and the forward and reverse rotations of the DC motor are determined by controlling the voltage polarity.

[0019] Further, the surge regulation and protection circuit includes varistors VR1, VR2, VR3. Varistors VR1, VR2 are respectively connected to the input terminals of rectifier bridges V1 and V2. By controlling the AC voltage input to the rectifier bridge, the rectified DC voltage is regulated. VR3 is connected in parallel at both ends of the DC motor and is used to regulate the speed of the DC motor.

[0020] Further, the overcurrent protection elements include PPTC1 and PPTC2. PPTC1 is connected to the input terminal of the rectifier bridge to protect the input current of the rectifier bridge. PPTC2 is connected in series in the power supply circuit of the DC motor to protect the current of the DC motor and its power supply line, preventing the DC motor from being overloaded or short-circuited.

[0021] Further, the varistors VR1 and VR2 regulate the voltage. The output of V1 is directly connected to relay RY2, while the output of V2 is connected to relay RY1, and the voltage polarity of the DC motor is controlled through the relay. The positive pole (+) of V1 is connected to contact 14 of relay RY2, and the negative pole (-) is connected to one end of the DC motor (8). The forward and reverse rotations of the DC motor (8) are controlled through the relay. The positive pole (+) of V2 is connected to contact 14 of relay RY1, and the negative pole (-) is connected to the other end of the DC motor (8). Varistors VR1 and VR2 are respectively located at the input terminals of V1 and V2 and are used to regulate the AC voltage entering the rectifier bridge. The overcurrent protection element PPTC1 is located at the input terminal of V2.

[0022] Further, the positive and negative electrodes of V1 and V2 also control the forward and reverse rotation of the DC motor (8) through relays. The contacts 12 and 11 of relays RY1 and RY2 are respectively connected to the output of the rectifier bridge, and the positive and negative electrodes of the rectifier bridge are switched to both ends of the DC motor (8) through different contacts.

[0023] Further, the outputs of V1 and V2 are connected to both ends of the DC motor (8); the contacts 11 and 12 of RY1 and the contacts 11 and 12 of RY2 are respectively connected to the positive and negative electrodes of V1 and V2.

[0024] On the other hand, the present utility model also provides an electric push-pull rod, which includes a housing. A DC motor, an outer sleeve, a stroke adjustment device and a stroke controller are installed on the housing, and the above-mentioned electric push-pull rod control circuit is provided inside the stroke controller.

[0025] Further, a worm gear and a worm meshing with the worm gear are provided on one side of the stroke adjustment device. A first gear is coaxially installed on the output shaft of the DC motor. A second gear meshing with the first gear is provided on one side of the first gear, and the second gear is coaxially fixed with the worm.

[0026] Further, a ball screw is coaxially installed at the end of the worm gear, and a screw nut is threadedly connected to the outer wall of the ball screw. The screw nut is fixedly connected to the outer sleeve.

[0027] Further, the DC motor is a DC220V motor.

[0028] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0029] 1. The present utility model can realize the forward and reverse rotation control of the motor through relays, and adjust the input voltage of the rectifier bridge through varistors, so as to flexibly control the speed and output of the motor. Each circuit is equipped with an overcurrent protection element to protect the current of the rectifier bridge and the motor respectively, avoiding damage caused by excessive current, improving the safety and reliability of the circuit. It makes the circuit have wide applicability in scenarios where the electric push-pull rod frequently requires forward and reverse rotation control of the motor, ensuring the stable operation of the motor under different loads and working conditions. And it has excellent braking characteristics, improving the mechanical self-locking performance and stroke positioning accuracy.

[0030] 2. The utility model adopts a DC220V motor with low power consumption and energy saving, solving the problem of large power consumption. It adopts a mechanical (worm and worm gear) and electric control double self-locking mechanism to improve the mechanical self-locking performance and stroke positioning accuracy. By using a DC220V DC motor, there is no need to equip a DC power supply. The input voltage is AC220V. Through an independently developed AC / DC conversion and control module, the DC220V DC motor is driven with low loss, solving the problem of large loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0032] Figure 2 is a schematic diagram of the partial structure of the utility model;

[0033] Figure 3 is a schematic diagram of the control circuit of the electric push-pull rod in Embodiment 1;

[0034] Figure 4 is a schematic diagram of the control circuit of the electric push-pull rod in Embodiment 2;

[0035] Figure 5 is a schematic diagram of the control circuit of the electric push-pull rod in Embodiment 3.

[0036] BRIEF DESCRIPTION OF THE DRAWINGS: 1. First gear; 2. Second gear; 3. Worm; 4. Worm wheel; 5. Ball screw; 6. Screw nut; 7. Outer sleeve; 8. DC motor; 81. Power cord; 82. Potentiometer wire; 9. Mounting plate; 10. Stroke adjustment device; 11. Stroke controller. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0038] Please refer to Figure 1 - Figure 2 , an electric push-pull rod, including a housing, on which a DC motor 8, an outer sleeve 7, a stroke adjustment device 10 and a stroke controller 11 are installed. The stroke controller 11 has an electric push-pull rod control circuit. In this embodiment, the DC motor 8 is preferably a DC220V / 70W motor.

[0039] Specifically, a worm gear 4 and a worm 3 meshing with the worm gear 4 are provided on one side of the stroke adjusting device 10. A first gear 1 is coaxially installed on the output shaft of the DC motor 8. A second gear 2 meshing with the first gear 1 is provided on one side of the first gear 1, and the second gear 2 is coaxially fixed with the worm 3. Wherein, a ball screw 5 is coaxially installed at the end of the worm gear 4, a screw nut 6 is threadedly connected to the outer wall of the ball screw 5, and the screw nut 6 is fixedly connected to the outer sleeve 7. By driving the first gear 1 to rotate through the DC motor 8, the torque is transmitted to the worm 3 through the second gear 2, driving the worm gear 4 to rotate, thereby driving the ball screw 5 to rotate, so that the screw nut 6 reciprocates on the ball screw 5, driving the outer sleeve 7 to expand and contract. Specifically, the second gear 2, the worm gear 4, and the worm 3 are all rotatably installed inside the housing of the stroke adjusting device 10, and the DC motor 8 is installed outside the housing and its output shaft extends into the housing. An installation plate 9 for installing the entire electric push rod is also installed outside the housing. The installation plate 9 is hinged to the housing of the electric push rod. When the load of the electric push rod is not consistent with the axial direction of the electric push rod, the electric push rod can automatically adapt to the load direction within a certain range. Among them, the stroke adjusting device 10 and the ball screw 5 are engaged through gears. In this embodiment, the stroke adjusting device 10 adopts a tubular motor.

[0040] Among them, the lead angle range of the worm gear is 4.9 degrees - 5.5 degrees.

[0041] Among them, a power cord 81 and a potentiometer wire 82 are also provided outside the housing of the stroke adjusting device 10 for connecting the power supply and the varistor.

[0042] Specifically, the inside of the outer sleeve 7 is hollow for accommodating the rotation of the ball screw 5. There is also a telescopic housing outside the outer sleeve 7 for accommodating the outer sleeve 7 to slide and expand and contract, and providing guidance for the screw nut 6.

[0043] The present utility model also proposes a supporting electric push rod control circuit through the following embodiments:

[0044] Embodiment 1 An electric push rod control circuit, as Figure 3 shown, includes:

[0045] An AC power supply, the AC power supply is single-phase 220V, and the alternating current is converted into direct current through a rectifier bridge circuit;

[0046] A rectifier bridge circuit for rectifying single-phase 220V alternating current into direct current to provide a stable DC power supply to drive the DC motor 8;

[0047] A DC motor 8, the DC motor 8 is connected to the output end of the rectifier bridge, and the drive and stop of the push rod are realized through a control circuit;

[0048] Relay control circuit, which controls the on / off of the DC motor 8 through a relay to realize the start and stop of the push-pull rod. The relay is driven by a control coil, and the coil receives a voltage signal from the rectifier bridge;

[0049] Surge regulation and protection circuit, which is used to regulate the magnitude of the voltage to control the starting working voltage of the DC motor 8 and control the action of the push-pull rod;

[0050] Overcurrent protection element. The overcurrent protection element uses a positive temperature coefficient thermistor. When the current is too large, the positive temperature coefficient thermistor rapidly increases to prevent the DC motor 8 or the circuit from being damaged due to overload.

[0051] Braking resistor R. The braking resistor R is used to immediately stop the DC motor (8) from working when power is cut off.

[0052] Specifically, the AC power supply includes AC input terminals L1, L2, N. The terminals L1, L2, N of the AC power supply are connected to the rectifier bridge through switches K1, K2. The on / off of the switches K1, K2 controls the start and stop of the entire circuit, and enters the two input terminals of the rectifier bridge through L11 and L12 respectively; the rectifier bridge circuit includes rectifier bridges V1, V2. The input of the rectifier bridge V1 is connected to the terminals L1 and L2 of the AC power supply, and the input of the rectifier bridge V2 is connected to the terminals L1 and L2 of the AC power supply. When a 220V voltage exists between L1 and N, it controls the forward rotation of the DC motor 8. When a 220V voltage exists between L2 and N, it controls the reverse rotation of the DC motor 8. The relay control circuit includes relays RY1, RY2. The coils of the relays are respectively connected to the positive poles of the rectifier bridges V1, V2. The normally open contacts of the relays switch the voltages at both ends of the DC motor 8, and the forward and reverse rotations of the DC motor 8 are determined by controlling the voltage polarity. The regulation and protection circuit includes varistors VR1, VR2, VR3. The varistors VR1, VR2 are respectively connected to the input terminals of the rectifier bridges V1 and V2. By controlling the AC voltage input to the rectifier bridge, the rectified DC voltage is regulated. VR3 is connected in parallel at both ends of the DC motor 8 to regulate the speed of the DC motor 8. The overcurrent protection elements include PPTC1 and PPTC2. PPTC1 is connected to the input terminal of the rectifier bridge to protect the input current of the rectifier bridge. PPTC2 is connected in series in the power supply circuit of the DC motor 8 to protect the current of the DC motor and its power supply line to prevent the DC motor 8 from being overloaded or short-circuited.

[0053] Among them, relays RY1 and RY2 are used to control the switching of the current. The relay coils control the on / off and direction of the motor. The positive and negative poles of motor M1 determine the direction of motor rotation. The contacts of the relay are connected to DC motor 8, and the operating state of the motor is changed by switching the contacts of the relay. Rectifier bridges V1 and V2 respectively receive AC inputs, and the voltages are regulated by varistors VR1 and VR2. The output of V1 is directly connected to relay RY2, while the output of V2 is connected to relay RY1, and the voltage polarity of the DC motor is controlled through the relay. The positive pole (+) of V1 is connected to contact 14 of relay RY2, and the negative pole (-) is connected to one end of the motor, and the forward and reverse rotation of the motor is controlled through the relay. The positive pole (+) of V2 is connected to contact 14 of relay RY1, and the negative pole (-) is connected to the other end of the motor. Varistors VR1 and VR2 are respectively located at the input ends of V1 and V2 to regulate the AC voltage entering the rectifier bridge. Overcurrent protection element PPTC1 is located at the input end of V2 to protect V2 from damage due to excessive current, while PPTC2 is located in the power supply circuit of the motor to protect the motor from overload.

[0054] Embodiment 2. An electric push-pull rod control circuit, as Figure 4 shown. The difference from Embodiment 1 is that the contact configuration of the relay is different. In this embodiment, the positive and negative poles of V1 and V2 also control the forward and reverse rotation of the motor through the relay, but the contact configuration of relays RY1 and RY2 has changed. Contacts 12 and 11 of RY1 and RY2 are respectively connected to the outputs of the rectifier bridge, and the positive and negative poles of the rectifier bridge are switched to both ends of the motor through different contacts. This change in configuration affects the voltage distribution during the operation of the motor, making the response of the motor different when switching between forward and reverse rotations.

[0055] Embodiment 3. An electric push-pull rod control circuit, as Figure 5As shown, the difference from Embodiment 1 is that the contact layouts of relays RY1 and RY2 are changed, and the outputs of V1 and V2 are switched to both ends of the motor through different contact configurations. Contacts 11 and 12 of RY1 and contacts 11 and 12 of RY2 are respectively connected to the positive and negative poles of V1 and V2, and the positive and negative pole voltages of the motor are controlled through the contact changes of the relays. Compared with the previous two circuits, the contact switching of the relays here is more complex, affecting the starting response speed and reaction time of the motor. At the same time, the connection methods of varistors VR1 and VR2 are the same as those in the previous two embodiments, but due to the differences in the relay contacts, the adjustment effects vary, especially showing different speed regulation characteristics when the motor load is large. The configurations of overcurrent protection components PPTC1 and PPTC2 are basically the same as those in the previous two circuits, still protecting the rectifier bridge and the motor to ensure that the circuit will not be damaged when the current is too large.

[0056] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0057] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric push-pull rod control circuit, characterized in that, Including: An AC power supply, which is a single-phase 220V AC power supply and converts alternating current into direct current through a rectifier bridge circuit; A rectifier bridge circuit, which is used to rectify alternating current into direct current and provide a stable DC power supply to drive the DC motor (8); A DC motor (8), which is connected to the output terminal of the rectifier bridge and realizes the driving and stopping of the push-pull rod through a control circuit; A relay control circuit, which controls the on and off of the DC motor (8) through a relay to realize the start and stop of the push-pull rod. The relay is driven by a control coil, and the coil receives a voltage signal from the rectifier bridge; A surge protection circuit, which is used to clamp the input voltage to protect the push rod control circuit; An overcurrent protection element, which uses a positive temperature coefficient thermistor. When the current is too large, the positive temperature coefficient thermistor rapidly increases to prevent the DC motor (8) or the circuit from being damaged due to overload; A braking resistor R, which is used to immediately stop the operation of the DC motor (8) when power is cut off.

2. The electric push-pull rod control circuit according to claim 1, wherein The AC power supply includes AC input terminals L1, L2, N. The terminals L1, L2, N of the AC power supply are connected to the rectifier bridge through switches K1, K2. The on and off of the switches K1, K2 control the start and stop of the entire circuit, and enter the two input terminals of the rectifier bridge through L11 and L12 respectively; The rectifier bridge circuit includes rectifier bridges V1, V2. The input of the rectifier bridge V1 is connected to the terminals L1 and L2 of the AC power supply, and the input of the rectifier bridge V2 is connected to the terminals L1 and L2 of the AC power supply. When a 220V voltage passes between L1 and N, the DC motor (8) is controlled to rotate forward, and when a 220V voltage passes between L2 and N, the DC motor (8) is controlled to rotate in reverse.

3. The electric push-pull rod control circuit according to claim 2, characterized in that, The relay control circuit includes relays RY1, RY2. The coils of the relays are respectively connected to the positive poles of the rectifier bridges V1, V2. The normally open contacts of the relays switch the voltages at both ends of the DC motor (8), and determine the forward and reverse rotation of the DC motor (8) by controlling the voltage polarity; The surge protection circuit includes varistors VR1, VR2, VR3. The varistors VR1, VR2 are respectively connected to the input terminals of the rectifier bridges V1 and V2, and adjust the rectified DC voltage by controlling the AC voltage input to the rectifier bridge. VR3 is connected in parallel at both ends of the DC motor (8) to adjust the speed of the DC motor (8); The overcurrent protection element includes PPTC1 and PPTC2. PPTC1 is connected to the input terminal of the rectifier bridge to protect the input current of the rectifier bridge. PPTC2 is connected in parallel in the power supply circuit of the DC motor (8) to protect the current of the DC motor and its power supply line and prevent the DC motor (8) from being overloaded or short-circuited.

4. The electric push-pull rod control circuit according to claim 3, characterized in that, The varistors VR1 and VR2 regulate the voltage. The output of V1 is directly connected to the relay RY2, while the output of V2 is connected to the relay RY1, and the voltage polarity of the DC motor is controlled through the relays; the positive terminal (+) of V1 is connected to the contact 14 of the relay RY2, and the negative terminal (-) is connected to one end of the DC motor (8), and the forward and reverse rotations of the DC motor (8) are controlled through the relay; the positive terminal (+) of V2 is connected to the contact 14 of the relay RY1, and the negative terminal (-) is connected to the other end of the DC motor (8); the varistors VR1 and VR2 are respectively located at the input ends of V1 and V2 for regulating the AC voltage entering the rectifier bridge; the overcurrent protection component PPTC1 is located at the input end of V2.

5. The electric push-pull rod control circuit according to claim 3, wherein The positive and negative terminals of V1 and V2 also control the forward and reverse rotations of the DC motor (8) through relays. The contacts 12 and 11 of the relays RY1 and RY2 are respectively connected to the output of the rectifier bridge, and the positive and negative poles of the rectifier bridge are switched to both ends of the DC motor (8) through different contacts.

6. The electric push-pull rod control circuit according to claim 3, characterized in that, The outputs of V1 and V2 are connected to both ends of the DC motor (8); the contacts 11 and 12 of RY1 and the contacts 11 and 12 of RY2 are respectively connected to the positive and negative poles of V1 and V2.

7. An electric push-pull rod, characterized in that, It includes a housing, on which a DC motor (8), an outer sleeve (7), a stroke adjustment device (10) and a stroke controller (11) are installed, and the stroke controller (11) has the electric push-pull rod control circuit according to any one of claims 1-6.

8. The electric push-pull rod according to claim 7, wherein One side of the stroke adjustment device (10) is provided with a worm gear (4) and a worm (3) meshing with the worm gear (4). A first gear (1) is coaxially installed on the output shaft of the DC motor (8). A second gear (2) meshing with the first gear (1) is arranged on one side of the first gear (1), and the second gear (2) is coaxially fixed with the worm (3).

9. The electric push-pull rod according to claim 8, characterized in that, A ball screw (5) is coaxially installed at the end of the worm gear (4). A screw nut (6) is threadedly connected to the outer wall of the ball screw (5), and the screw nut (6) is fixedly connected to the outer sleeve (7).

10. The electric push-pull rod according to claim 7, characterized in that, The DC motor (8) is a DC220V motor.

Images