Safety control circuit for a direct current tubular motor

Abstract

The application provides a DC tubular motor safety control circuit and relates to the technical field of roll-up door motors, which comprises a motor, a power supply, an absorption resistor, a relay, a relay coil and a relay switch, the relay coil is connected in parallel between the positive and negative poles of the power supply, the relay switch is connected in series between the power supply and the motor, the relay switch comprises a common end electrically connected to the first end of the motor, a normally open end electrically connected to the positive pole of the power supply and a normally closed end electrically connected to the first end of the absorption resistor, and the second end of the absorption resistor is electrically connected to the second end of the motor. The application has the advantages of simple structure, the roll-up door can descend under the gravity after the power supply of the roll-up door is powered off or damaged, the descending of the door body does not need to be adjusted separately, the absorption resistor slows down the descending speed of the door body, in the multiple linked door bodies, the abnormal door body can be effectively distinguished after the power supply of the door body is powered off, the maintenance is facilitated, the other linked door bodies are not affected, the safety is further improved, and the applicability is good.

Description

Technical Field

[0001] This invention relates to the field of rolling door motor technology, and in particular, to a safety control circuit for a DC tubular motor. Background Technology

[0002] Tubular motors are commonly used in electric roller shutters. The motor is concealed inside the roller tube. The rotation of the motor drives the drive shaft to rotate, thereby raising and lowering the shutter slats. When rising, the slats are wound around the roller shaft, and when descending, the slats slide down the inside of the guide rail. The raising, stopping, and lowering of the shutter are controlled by a remote control.

[0003] Tubular motors require stable control through safety procedures. Furthermore, roller shutters and windows (hereinafter collectively referred to as roller doors) are heavy. If the tubular motor driving the roller door loses power or is damaged, safety protection measures must be implemented to prevent the roller door from falling due to power failure, ensuring the safety of pedestrians below. Current power failure protection directly stops the roller door when power is lost. For example, Chinese invention patent CN202076975U discloses a DC motor power failure braking device, including a relay power supply circuit, a DC tubular motor braking circuit, and a MOSFET protection circuit. The normally closed and moving contacts of the relay in the relay power supply circuit are connected to the two ends of the DC motor in the DC tubular motor braking circuit and the MOSFET protection circuit. It also includes a DC motor commutation circuit and an induced electromotive force isolation circuit, which are respectively connected to the normally closed and normally open contacts of the relay. This braking device isolates the induced electromotive force generated by the motor during power failure from the power supply, eliminating the influence of motor power failure on the power supply, resulting in rapid and accurate braking with good braking effect.

[0004] However, the aforementioned DC motor power-off braking device still has the following problems: In addition to the possibility of mains power failure, the roller door may also experience a power failure due to a malfunction. Once a power failure occurs but the mains power is still available, the roller door will stop at the top and can only be slowly lowered by mechanical adjustment, which is very troublesome. Moreover, in special scenarios, such as shopping malls and large factories, there are dozens or even hundreds of roller doors. Once the mains power fails, such a large number of doors need to be lowered manually, which takes a very long time and still poses a safety hazard. Furthermore, if a few roller doors among several linked doors malfunction and break down, the entire door will stop, and it will be impossible to find the faulty door, which still poses a safety hazard. It will also affect the other linked doors, preventing them from lowering, making it inconvenient to use.

[0005] Therefore, in order to solve the above problems, it is necessary for us to design a reasonable and efficient safety control circuit for DC tubular motors. Summary of the Invention

[0006] The purpose of this invention is to provide a DC tubular motor safety control circuit with a simple structure. After the mains power to the roller door is cut off or damaged, the roller door can still descend under gravity without the need for separate adjustment of the door's descent. Furthermore, due to the absorption resistor, the descent speed of the door is effectively slowed down, resulting in good safety. It can also be applied to multiple interconnected doors. After the door descent is interrupted or malfunctions, the abnormal door can be effectively identified, facilitating maintenance without affecting other interconnected doors, further improving safety and demonstrating good applicability.

[0007] To achieve the above objectives, the present invention employs the following technical solution:

[0008] A safety control circuit for a DC tubular motor, comprising:

[0009] Electric motor;

[0010] power supply;

[0011] Absorption resistance;

[0012] The relay includes a relay coil and a relay switch;

[0013] The relay coil is connected in parallel between the positive and negative terminals of the power supply;

[0014] The relay switch is connected in series between the power supply and the motor;

[0015] The relay switch includes a common terminal electrically connected to the first end of the motor, a normally open terminal electrically connected to the positive terminal of the power supply, and a normally closed terminal electrically connected to the first end of the absorption resistor.

[0016] The second end of the absorption resistor is electrically connected to the second end of the motor;

[0017] When the power supply is turned on, the relay coil is energized, driving the common terminal and normally open terminal of the relay switch to close, and the power supply supplies power to the motor, which facilitates the lifting and lowering of the door connected to the motor;

[0018] When the power supply is interrupted, the relay coil loses power, driving the common terminal and normally closed terminal of the relay switch to close. The absorption resistor is connected in parallel to both ends of the motor to absorb the electrical energy generated by the motor when the door connected to the motor falls under the action of gravity when the power supply is interrupted, thereby slowing down the falling speed of the door.

[0019] As a preferred embodiment of the present invention, a brake coil is also included. The brake coil is electrically connected to the positive terminal of the power supply and is connected to the door body, so that when the power supply is energized, the brake coil generates magnetic force to brake the door body; when the power supply is de-energized, the brake coil loses magnetic force, and the door body connected to the motor falls under the action of gravity.

[0020] As a preferred embodiment of the present invention, it further includes a brake control, wherein the other end of the brake coil is electrically connected to the brake control, such that when the power supply is energized, the brake control controls the brake coil to generate magnetic force to brake the door to a stop.

[0021] As a preferred embodiment of the present invention, it further includes a door opening and closing limit part, which is connected in series with a relay coil and then connected in parallel between the positive and negative terminals of the power supply, and the door opening and closing limit part is electrically connected to the motor.

[0022] As a preferred embodiment of the present invention, the door limiting part includes a first limiting part and a second limiting part. The first limiting part includes a first contact switch and a first diode, and the second limiting part includes a second contact switch and a second diode. The first diode and the second diode have opposite conduction directions, and both the first contact switch and the second contact switch are electrically connected to the motor.

[0023] As a preferred embodiment of the present invention, the power supply is a 24VDC power supply, and the motor is a DC24V motor.

[0024] The beneficial effects of the DC tubular motor safety control circuit of the present invention are as follows: the structure is simple, and the roller door can descend under gravity after the mains power is cut off or damaged, without the need for separate adjustment of the door's descent. Moreover, due to the absorption resistor, the descent speed of the door is effectively slowed down, resulting in good safety. It can also be applied to multiple interconnected doors. After the door descent is interrupted or malfunctions, the abnormal door can be effectively identified, facilitating maintenance, without affecting other interconnected doors, further improving safety and making it highly applicable. Attached Figure Description

[0025] Figure 1 This is a circuit diagram showing the overall structure of a DC tubular motor safety control circuit according to an embodiment of the present invention when the power is on.

[0026] Figure 2 This is a circuit diagram showing the overall structure of a DC tubular motor safety control circuit according to an embodiment of the present invention when the power is off.

[0027] In the diagram: J1, relay coil; J2, relay switch; J2-COM, common terminal; J2-NO, normally open terminal; J2-NC, normally closed terminal; M, motor; R1, absorption resistor; L1, brake coil; L2, brake control; K1, first contact switch; D1, first diode; K2, second contact switch; D2, second diode; DC, power supply. Detailed Implementation

[0028] The following are specific embodiments of the present invention, which further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0029] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement and steps of the modules and steps set forth in these embodiments do not limit the scope of the invention.

[0030] At the same time, it should be understood that, for ease of description, the process shown in the attached diagram is not performed in isolation, but rather involves multiple steps that overlap.

[0031] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0033] Techniques, methods, and systems known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of this specification.

[0034] Example: Figures 1 to 2 The illustration shown is merely one embodiment of the present invention, a DC tubular motor safety control circuit comprising:

[0035] Motor M; Motor M is the DC motor part of the DC tubular motor, used to drive the roller door to move up and down. When motor M rotates forward, the roller door moves up to open; conversely, if motor M rotates in reverse, the roller door moves down to close (considering that there is a difference between left-side and right-side installation of tubular motor roller doors, the motor rotation direction is opposite when the roller door is installed on the left and right sides, respectively).

[0036] Power supply; the power supply is actually a DC power supply, which mainly converts the 220V 50Hz AC mains power into DC power, and then supplies power to the motor M in DC form;

[0037] The absorption resistor R1 is a standard resistor; the absorption resistor R1 with different resistance values ​​is selected according to the model of the motor M.

[0038] The relay includes a relay coil J1 and a relay switch J2;

[0039] The relay coil J1 is connected in parallel between the positive and negative terminals of the power supply;

[0040] The relay switch J2 is connected in series between the power supply and the motor M;

[0041] The relay switch J2 includes a common terminal J2-COM electrically connected to the first terminal of the motor M, a normally open terminal J2-NO electrically connected to the positive terminal of the power supply, and a normally closed terminal J2-NC electrically connected to the first terminal of the absorption resistor R1. When the relay coil J1 is normally energized, the relay switch J2 is in the energized state, that is, the common terminal J2-COM is connected to the normally open terminal J2-NO. Conversely, when the relay coil J1 is abnormally de-energized, the relay switch J2 is in the de-energized state, that is, the common terminal J2-COM is connected to the normally closed terminal J2-NC.

[0042] The second end of the absorption resistor R1 is electrically connected to the second end of the motor M; that is, once the relay switch J2 is released, the common terminal J2-COM is connected to the normally closed terminal J2-NC, the motor M is in a de-energized state, and the absorption resistor R1 is directly connected in parallel across the two ends of the motor M.

[0043] Conversely, once relay switch J2 is engaged, the motor M and relay coil J1 are connected in parallel between the positive and negative terminals of the power supply.

[0044] It should be noted that the relay coil J1 is directly connected to the positive terminal of the power supply. That is to say, the part of the motor M connected in series with the relay switch J2 and the relay coil J1 are connected in parallel and together between the positive and negative terminals of the power supply.

[0045] When the power supply is turned on, the relay coil J1 is energized, driving the common terminal J2-COM of the relay switch J2 to close with the normally open terminal J2-NO. The power supply then supplies power to the motor M, facilitating the lifting and lowering of the door connected to the motor M.

[0046] At this time, the 220V mains power is normally converted into DC power to supply power to the relay coil J1 and motor M. Under the control of the controller, motor M rotates forward, reverses, or stops rotating to complete the upward, downward, and stop (self-test) operations of the rolling door.

[0047] When the power supply is interrupted, the relay coil J1 loses power, driving the common terminal J2-COM and normally closed terminal J2-NC of the relay switch J2 to close. The absorption resistor R1 is connected in parallel to the two ends of the motor M. At this time, the power supply stops supplying power to the motor M. This is used to absorb the electrical energy generated by the motor M when the door connected to the motor M falls under the action of gravity when the power supply is interrupted, so as to slow down the falling speed of the door.

[0048] It should be noted that when relay coil J1 is de-energized, relay switch J2 is directly de-energized and released, causing the common terminal J2-COM to close with the normally closed terminal J2-NC.

[0049] Once relay switch J2 is released, the common terminal J2-COM is connected to the normally closed terminal J2-NC, and motor M is de-energized. The absorption resistor R1 is directly connected in parallel across motor M. At this time, the absorption resistor R1 and motor M form a circuit, and motor M is not subject to any external control. If the roller door is not at its upper limit, it will naturally descend under gravity. Simultaneously, the roller door shaft and motor shaft are connected by a chain, and the descent of the roller door will drive the motor to rotate. The absorption resistor R1 connected in parallel across motor M reduces the current in the absorption resistor R1-motor M circuit, thereby slowing down the speed of motor M and further slowing down the descent speed of the roller door. The slowly descending roller door does not require manual adjustment and will not injure people passing below it.

[0050] Once the power supply is turned on again, the relay coil J1 is energized again, the relay switch J2 is energized and connected to the common terminal J2-COM and the normally open terminal J2-NO, and the motor M starts working again.

[0051] In this invention, a brake coil L1 is also included. The brake coil L1 is electrically connected to the positive terminal of the power supply and is connected to the door body. When the power supply is on, the brake coil L1 generates magnetic force to stop the door body. When the power supply is off, the brake coil L1 loses its magnetic force, and the door body connected to the motor M falls under the action of gravity. That is to say, the brake coil L1 is set up independently and is not controlled by the on / off state of the relay. The brake coil L1 is directly powered by the power supply. In other words, when the power supply is off, the brake coil L1 is also de-energized, and the rolling door will not stop, but will slowly descend under the combined action of gravity and the absorption resistor R1. Conversely, when the power supply is on, the brake coil L1 is also energized, and the controller directly controls whether the brake coil L1 brakes the rolling door. At this time, there is no absorption resistor R1 at both ends of the motor M for protection, and the controller directly controls whether the rolling door brakes, which can prevent the rolling door from falling directly and injuring people.

[0052] As one embodiment of the present invention, the present invention also includes a brake control L2. The other end of the brake coil L1 is electrically connected to the brake control L2, so that when the power supply is on, the brake control L2 controls the brake coil L1 to generate magnetic force to stop the door. When the power supply is on, after the controller controls the roller door to move upward to the upper limit, the motor stops working. At this time, under the control of the controller, the brake control L2 drives the brake coil L1 to work, and the brake structure locks the roller door, preventing the door from falling and injuring people. Also, when the controller controls the roller door to stop moving upward or downward, the motor also stops working. At this time, under the control of the controller, the brake control L2 drives the brake coil L1 to work, and the brake structure locks the roller door, preventing the door from falling and injuring people.

[0053] In the control circuit of a conventional tubular motor, in order to prevent the rolling door from falling and injuring people when the power is cut off, only relay control can be used. When the power is on, the motor M works normally, and when the power is cut off, the brake coil is de-energized and locks the rolling door. So once the power is cut off, the rolling door will be fixed in the original position. However, the brake coil may also malfunction. If the rolling door is suspended for too long, there is still a possibility of it falling down, endangering people and objects below the rolling door.

[0054] In contrast, this invention takes the opposite approach. When the power supply is on, the brake coil L1 selects whether to stop under the action of the controller and the brake control L2. After the power is cut off, the brake coil L1 becomes ineffective. The motor M directly forms a circuit with the absorption resistor R1, so that the roller door body slowly descends under the action of gravity, and pedestrians will not be injured when passing under the roller door.

[0055] Moreover, when used in large buildings with a large number of roller doors, all roller doors will slowly descend and close once the mains power is cut off, eliminating the need for manual lowering of each roller door, thus saving manpower; and even when the roller doors descend at a sufficiently slow speed, people below the roller doors still have enough time to evacuate.

[0056] The following is a further description of the usage scenarios for roller shutters:

[0057] The power supply on / off mentioned above refers to the mains power supply. However, there is another scenario: the mains power is not interrupted, but there is a fault in the inverter that converts 220VAC mains power to DC power, or a fault in the power supply circuit, or a fault in the relay coil J1 at the relay. All of these are collectively referred to as "faults" (as opposed to mains power failure). In these cases, the relay coil J1 will lose power, and the relay switch J2 will be directly de-energized and released, causing the common terminal J2-COM to close with the normally closed terminal J2-NC. The rolling door will then descend slowly.

[0058] If a single roller door or tubular motor malfunctions in one of the multiple roller doors that are controlled together, the malfunctioning roller door will slowly descend at a different speed than the speed at which the motor M drives the roller door body downward. This makes it easy to observe that the roller door has malfunctioned and allows for convenient targeted repairs.

[0059] Furthermore, if multiple roller doors have their bottom beams connected as a single unit, and each roller door has its own motor, these roller doors and motors must move up and down synchronously; otherwise, the bottom beams will be damaged. If one roller door malfunctions while the others continue to operate normally, the other normal roller doors will not damage the bottom beams when they move up and down due to the "malfunctioning" roller door stopping. The "malfunctioning" roller door will move up and down along with the other roller doors. Under the action of the absorption resistor R1, the up and down speed of the entire roller door system will be slowed down, and the "malfunction" of the roller door can still be clearly observed, making targeted repairs very convenient.

[0060] As one embodiment of the present invention, the present invention further includes a door limiting part, which is connected in series with the relay coil J1 and then connected in parallel between the positive and negative terminals of the power supply, and the door limiting part is electrically connected to the motor M.

[0061] When powered on, once the roller door reaches its upper or lower limit position, the door opening and closing limit unit senses that the roller door has reached the corresponding position and notifies the motor M to stop working, so as to prevent the motor M from rotating further and causing damage to the roller door.

[0062] Here, the door limiting part includes a first limiting part and a second limiting part. The first limiting part includes a first contact switch K1 and a first diode D1. The second limiting part includes a second contact switch K2 and a second diode D2. The first diode D1 and the second diode D2 have opposite conduction directions. The first contact switch K1 and the second contact switch K2 are both electrically connected to the motor M.

[0063] As mentioned above, there are differences between left-side and right-side mounted tubular motor roller doors. The first limiting part formed by the first contact switch K1 and the first diode D1 and the second limiting part formed by the second contact switch K2 and the second diode D2 are oppositely connected, which can form opposite up and down limit controls; for example, the first limiting part of the left-side mounted roller door is the upper limit control, while the second limiting part of the right-side mounted roller door is the upper limit control.

[0064] Finally, the power supply is a 24VDC power supply, and correspondingly, the motor M is a DC24V motor.

[0065] This invention discloses a DC tubular motor safety control circuit with a simple structure. Even after a power outage or damage to the roller shutter, the door can still descend under gravity without requiring separate adjustment. Furthermore, the absorption resistor effectively slows down the descent, enhancing safety. It can also be applied to multiple interconnected doors, effectively identifying the faulty door after a power outage or malfunction, facilitating repairs without affecting other interconnected doors, further improving safety and demonstrating broad applicability.

[0066] This invention is not limited to the specific embodiments described above, and various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made to the above embodiments based on the technical essence of this invention should be included within the scope of protection of this invention.

Claims

1. A safety control circuit for a DC tubular motor, characterized in that, include: Motor (M); power supply; Absorption resistor (R1); A relay, the relay comprising a relay coil (J1) and a relay switch (J2); The relay coil (J1) is connected in parallel between the positive and negative terminals of the power supply; The relay switch (J2) is connected in series between the power supply and the motor (M); The relay switch (J2) includes a common terminal (J2-COM) electrically connected to the first terminal of the motor (M), a normally open terminal (J2-NO) electrically connected to the positive terminal of the power supply, and a normally closed terminal (J2-NC) electrically connected to the first terminal of the absorption resistor (R1). The second end of the absorption resistor (R1) is electrically connected to the second end of the motor (M); When the power supply is turned on, the relay coil (J1) is energized, driving the common terminal (J2-COM) and normally open terminal (J2-NO) of the relay switch (J2) to close, and the power supply supplies power to the motor (M), so as to drive the door connected to the motor (M) to rise and fall. When the power supply is interrupted, the relay coil (J1) loses power, driving the common terminal (J2-COM) and normally closed terminal (J2-NC) of the relay switch (J2) to close. The absorption resistor (R1) is connected in parallel to the two ends of the motor (M) to absorb the electrical energy generated by the motor (M) when the door connected to the motor (M) falls under the action of gravity when the power supply is interrupted, thereby slowing down the falling speed of the door.

2. The safety control circuit for a DC tubular motor according to claim 1, characterized in that: It also includes a brake coil (L1), which is electrically connected to the positive terminal of the power supply and connected to the door body. When the power supply is on, the brake coil (L1) generates a magnetic force to stop the door body; when the power supply is off, the brake coil (L1) loses its magnetic force, and the door body connected to the motor (M) falls under the action of gravity.

3. The safety control circuit for a DC tubular motor according to claim 2, characterized in that: It also includes a brake control (L2), with the other end of the brake coil (L1) electrically connected to the brake control (L2), so that when the power supply is energized, the brake control (L2) controls the brake coil (L1) to generate magnetic force to stop the door.

4. The safety control circuit for a DC tubular motor according to claim 1, characterized in that: It also includes a door opening and closing limit part, which is connected in series with the relay coil (J1) and then connected in parallel between the positive and negative terminals of the power supply. The door opening and closing limit part is electrically connected to the motor (M).

5. A safety control circuit for a DC tubular motor according to claim 4, characterized in that: The door limiting part includes a first limiting part and a second limiting part. The first limiting part includes a first contact switch (K1) and a first diode (D1). The second limiting part includes a second contact switch (K2) and a second diode (D2). The first diode (D1) and the second diode (D2) have opposite conduction directions. The first contact switch (K1) and the second contact switch (K2) are both electrically connected to the motor (M).

6. The safety control circuit for a DC tubular motor according to claim 1, characterized in that: The power supply is a 24VDC power supply, and the motor (M) is a DC24V motor.

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