Self-locking circuit

Abstract

The utility model belongs to the technical field of electric lifting, and discloses a self-locking circuit which is applied to a lifting system and comprises a power supply, a driving motor, a switch control unit and a steering control circuit. The power supply and the steering control circuit are respectively connected with the driving motor through the switch control unit, the steering control circuit is grounded, and the switch control unit is used for controlling the steering and / or locking state of the driving motor. Therefore, the driving motor can be self-locked during power failure through the switch control unit, the risk that personnel below are injured and articles are damaged due to the fact that the lifting system loses power and a platform or a borne object suddenly descends is avoided, meanwhile, the lifting system can maintain the original position, the whole lifting system still maintains the bearing capacity, and the safety of the lifting system is improved. And the reliability and the safety of the whole lifting system are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric lifting technical field, especially a self locking circuit. BACKGROUND

[0002] In modern office and industrial production scene, the application of lifting system (such as lifting table, lift) is more and more widespread. However, the current lifting system generally has a key defect, in the case of no power supply or external power failure, most lifting systems lack effective self locking ability, cannot maintain the bearing capacity, leading to the goods on the lifting platform to fall easily, not only cause the waste of production goods, also can form the great threat to the life safety of the staff below. CONTENT OF THE UTILITY MODEL

[0003] The utility model discloses a self locking circuit, which aims to solve the technical problem that the existing lifting system lacks self locking ability when there is no power supply, so that it cannot maintain the bearing capacity and is prone to safety hazards.

[0004] In order to realize the above-mentioned utility model purpose, the utility model provides a self locking circuit, which is applied to a lifting system, comprising a power supply, a driving motor, a switch control unit and a steering control circuit.

[0005] The power supply and the steering control circuit are connected to the driving motor through the switch control unit respectively, and the steering control circuit is grounded, and the switch control unit is used for controlling the steering and / or locking state of the driving motor.

[0006] Further, the switch control unit comprises a first relay, a first end of the first relay is connected to a first end of the driving motor, and a second end of the first relay is connected to a first end of the power supply or a first end of the steering control circuit.

[0007] Further, the switch control unit further comprises a second relay, a first end of the second relay is connected to a second end of the driving motor, and a second end of the second relay is connected to a second end of the power supply or a second end of the steering control circuit.

[0008] Further, the self locking circuit further comprises a first resistor, a first end of the first resistor is connected to a first end of the driving motor, and a second end of the first resistor is connected to a second end of the power supply.

[0009] Further, when the self-locking circuit is powered off, the first end of the first relay is connected to the first end of the driving motor, the second end of the first relay is connected to the first end of the power supply, at this time the first end and the second end of the first relay are connected, the first end of the second relay is connected to the second end of the driving motor, and the second end of the second relay is connected to the second end of the steering control circuit.

[0010] Further, when the driving motor is rotating forward, the first end of the first relay is connected to the first end of the driving motor, the second end of the first relay is connected to the first end of the power supply, the first end and the second end of the first relay are connected, the first end of the second relay is connected to the second end of the driving motor, and the second end of the second relay is connected to the second end of the steering control circuit.

[0011] Further, when the driving motor is rotating backward, the first end of the first relay is connected to the first end of the driving motor, the second end of the first relay is connected to the first end of the steering control circuit, the first end of the second relay is connected to the second end of the driving motor, and the second end of the second relay is connected to the second end of the power supply.

[0012] Further, the steering control circuit comprises a first connecting line and a speed regulation sampling circuit, two ends of the first connecting line are respectively connected to the second end of the first relay and the second end of the second relay, the first end of the speed regulation sampling circuit is connected to the first connecting line, and the second end of the speed regulation sampling circuit is grounded.

[0013] Further, the speed regulation sampling circuit comprises a first transistor, the first end of the first transistor is connected to the first connecting line, and the second end of the first transistor is grounded.

[0014] Further, the speed regulation sampling circuit further comprises a second resistor, the second resistor is connected in series with the first transistor, the first end of the second resistor is connected to the second end of the first transistor, and the second end of the second resistor is grounded.

[0015] Beneficial effects:

[0016] The utility model discloses a self locking circuit, apply to the lifting system, including power supply, drive motor, switch control unit and steering control circuit, power supply and steering control circuit are connected drive motor through switch control unit respectively, and steering control circuit ground connection, switch control unit is used for controlling the steering and / or locking state of drive motor. Therefore through switch control unit realizes drive motor when power failure can be self locking, avoided because of the risk of lifting system losing power, platform or load suddenly descending, and then smashing the lower personnel, damaging the article, and lifting system can maintain the original position simultaneously, makes the whole lifting system still keep the bearing capacity, improves the reliability and security of whole lifting system. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is the self locking circuit schematic diagram of an embodiment of the utility model;

[0018] Figure 2 It is A self locking schematic diagram of the self locking circuit of another embodiment of the utility model;

[0019] Figure 3 It is B self locking schematic diagram of the self locking circuit of another embodiment of the utility model;

[0020] Figure 4 It is the ascending schematic diagram of the self locking circuit of another embodiment of the utility model;

[0021] Figure 5 It is the descending schematic diagram of the self locking circuit of another embodiment of the utility model.

[0022] Wherein:

[0023] VCC, power supply, M, drive motor, R4, first resistance;

[0024] K1, first relay, K1-A, first contact, K1-B, second contact, K1-C, third contact;

[0025] K2, second relay, K2-A, fourth contact, K2-B, fifth contact, K2-C, sixth contact;

[0026] 10, first connecting line, 11, speed regulation sampling circuit;

[0027] Q, first transistor, R1, second resistance.

[0028] The utility model discloses the realization, functional characteristics and advantages will be further explained with reference to the embodiment, the attached drawing. DETAILED DESCRIPTION

[0029] It should be understood that the specific embodiments described herein are merely exemplary and do not limit the present application.

[0030] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0031] In the description of the present application, it should be understood that, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication between two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In the present application, unless otherwise specifically defined and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or can include the contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical direction of the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical direction of the first feature below and obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0033] Referring to Figures 1-5 , the embodiment provides a self-locking circuit applied to a lifting system, comprising a power supply VCC, a driving motor M, a switch control unit and a steering control circuit.

[0034] The power supply VCC and the steering control circuit are connected to the driving motor M through the switch control unit respectively, and the steering control circuit is grounded, and the switch control unit is used for controlling the steering and / or locking state of the driving motor M.

[0035] In the above embodiment, the self-locking circuit is applied to the lifting system of office equipment, medical equipment, robots and other industries, especially the lifting machine and the lifting table. The self-locking circuit mainly consists of a power supply VCC, a driving motor M, a switch control unit and a steering control circuit. The power supply VCC is a direct current or a battery pack, which provides power support for the whole system, and is connected to the switch control unit through a wire, ensuring that the driving motor M has enough energy to drive when working normally. The driving motor M is the core power source of the lifting system, which is responsible for driving the up and down movement of the lifting platform. The steering control circuit is used to adjust the steering of the driving motor M. When the steering of the driving motor M needs to be changed, the steering control circuit adjusts the direction of the current through the switch control unit, so that the motor rotates. That is, the power supply VCC and the steering control circuit are connected to the driving motor M through the switch control unit respectively, that is, the switch control unit is used for controlling the steering and / or locking state of the driving motor M, thereby realizing the forward and reverse rotation control and locking function of the motor. Therefore, through the switch control unit, the driving motor M can be self-locked when power is off, avoiding the risk of sudden falling of the platform or the load due to the loss of power of the lifting system, thereby injuring the person below and damaging the goods. At the same time, the lifting system can maintain the original position, so that the whole lifting system still maintains the bearing capacity, improving the reliability and safety of the whole lifting system.

[0036] Reference Figures 1-5 In the above embodiment, the switch control unit includes a first relay K1, which is a double-contact relay with three key connection points. The first end of the first relay K1 is connected to the first end of the driving motor M. The second end of the first relay K1 is connected to the first end of the power supply VCC or the first end of the steering control circuit. The third end of the first relay K1 is connected to the first end of the power supply VCC or the first end of the steering control circuit. Among them, the first end of the first relay K1 is the first contact K1-A, the second end of the first relay K1 is the second contact K1-B, and the third end of the first relay K1 is the third contact K1-C.

[0037] Further, the switch control unit further comprises a second relay K2, which is also a double-contact relay, having three key connection points, the first end of the second relay K2 is connected to the second end of the driving motor M, the second end of the second relay K2 is connected to the second end of the power supply VCC or the second end of the steering control circuit, and the third end of the second relay K2 is connected to the second end of the steering control circuit or the second end of the power supply VCC, wherein the first end of the second relay K2 is the fourth contact K2-A, the second end of the first relay K2 is the fifth contact K2-B, and the third end of the first relay K2 is the sixth contact K2-C, further, the self-locking circuit further comprises a first resistor R4, which is a brake resistor, mainly used to provide controllable brake force when the driving motor M is in a descending state, the first end of the first resistor R4 is directly connected to the first end of the driving motor M, and the second end is connected to the second end of the power supply VCC, or the first end of the first resistor R4 is connected to the first end of the steering control circuit, i.e. the second contact K1-B, and the second end of the first resistor R4 is connected to the second end of the driving motor M, so that the first resistor R4 is connected in parallel with the driving motor M during the descending process, thereby realizing dynamic brake adjustment and ensuring that the lifting system can smoothly decelerate and remain stable during the descending process, and adjusting the first resistor R4 can adjust the brake force, and R4 has no effect on the rising.

[0038] With reference to Figure 2 In an embodiment, the first end of the first relay K1 is connected to the first end of the driving motor M, and the second end of the first relay K1 is connected to the first end of the power supply VCC, at this time the first end and the second end of the first relay K1 are connected, the first end of the second relay K2 is connected to the second end of the driving motor M, and the second end of the second relay K2 is connected to the second end of the power supply VCC, at this time the first end and the second end of the second relay K2 are connected, and the first end and the second end of the first and second relays are common contacts, i.e. the first end and the second end are connected under the condition that the relay is not powered, the two ends of the driving motor are short-circuited, forming electromagnetic self-locking, and preventing the driving motor M from rotating.

[0039] With reference to Figure 3In an embodiment, the first end of the first relay K1 is connected to the first end of the driving motor M, the third end of the first relay K1 is connected to the first end of the steering control circuit, the first end of the second relay K2 is connected to the second end of the driving motor M, and the third end of the second relay K2 is connected to the second end of the steering control circuit. The first end and the third end of the first and second relays are normally closed, that is, the first end and the third end are connected and communicated when the relays are not powered, the first end and the second end of the driving motor M are connected together, the two ends of the driving motor are short-circuited, electromagnetic self-locking is formed, and the driving motor M is prevented from rotating. This is another method of realizing self-locking. The self-locking state of the two connection modes causes the two ends of the driving motor M to be short-circuited. This short-circuiting method generates a reverse electromotive force, forms electromagnetic self-locking, and prevents the driving motor M from rotating. At this time, the driving motor M is locked, the lifting platform maintains the current height, and the lifting platform will not suddenly drop due to loss of power, effectively avoiding the risk of sudden drop of equipment caused by power interruption.

[0040] Further, when the driving motor M needs to rotate forward, the first end of the first relay K1 is connected to the first end of the driving motor M, the second end of the first relay K1 is connected to the first end of the power supply VCC, the first end and the second end of the first relay K1 are connected and communicated, the first end of the second relay K2 is connected to the second end of the driving motor M, the second end of the second relay K2 is connected to the second end of the steering control circuit, the second end of the second relay K2 is connected to the second end of the power supply, the first end and the third end of the second relay K2 are connected, and the first end and the third end of the second relay K2 are connected and communicated, so that the first transistor Q in the steering control circuit is turned on (as shown in Figure 4 ), at this time, the first end of the driving motor M obtains forward current from the power supply VCC, and the second end flows out current, so that the driving motor M rotates forward and drives the lifting platform to rise. At the same time, the potential difference between the two ends of the first resistor R4 is equal, no current passes through, and the first resistor R4 does not participate in braking operation, which ensures that the driving motor M can obtain maximum lifting force, so that the driving motor M can operate efficiently in the rising stage, and unnecessary resistance is avoided.

[0041] Further, when the driving motor M needs to be reversed, the first end of the first relay K1 is connected to the first end of the driving motor M, the second end or the third end of the first relay K1 is connected to the first end of the steering control circuit, the second end of the first relay K1 is connected to the first end of the power supply VCC, the first end of the first relay K1 is connected to the third end, the first end and the third end of the first relay are in communication, the first end of the second relay K2 is connected to the second end of the driving motor M, the second end of the second relay K2 is connected to the second end of the power supply VCC, the third end of the second relay K2 is connected to the second end of the steering control circuit, the first end of the second relay K2 is connected to the second end, the first end and the second end of the second relay are in communication, the first transistor Q in the steering control circuit is turned on, and the first resistor R4 is connected in parallel between the driving motor (for example Figure 5 ), and functions as a brake. At this time, the first end of the driving motor M flows out current, and the second end obtains power through the second end of the power supply VCC, so that the driving motor M is reversed and drives the lifting platform to descend. At the same time, the first resistor R4 is connected in parallel with the coil of the driving motor M, absorbs the reverse electromotive force, generates a braking torque, and provides a controllable braking force, so that the driving motor M can smoothly decelerate in the descending stage, and the risk of rapid falling of the equipment due to sudden loss of power is avoided.

[0042] Referring to Figure 1 In an embodiment, the steering control circuit comprises a first connecting line 10 and a speed regulation sampling circuit 11, two ends of the first connecting line 10 are respectively connected to the second end of the first relay K1 and the second end of the second relay K2, and the first end of the speed regulation sampling circuit 11 is connected to the first connecting line 10, and the second end of the speed regulation sampling circuit 11 is grounded.

[0043] In the above embodiment, the steering control circuit mainly comprises the first connecting line 10 and the speed regulation sampling circuit 11. The first connecting line 10 is a wire for connecting the first relay K1 and the second relay K2, and two ends thereof are respectively connected to the second end or the third end of the first relay K1 and the second end or the third end of the second relay K2. This connecting line actually functions as the first end and the second end of the steering control circuit, so that current can flow in from the first end or the second end of the driving motor M as needed, thereby realizing forward and reverse rotation switching. In addition, the first end of the speed regulation sampling circuit 11 is connected to the first connecting line 10, and the second end of the speed regulation sampling circuit 11 is grounded, so that the current size in the driving motor M can be monitored in real time, and the safe operation of the lifting platform in the ascending or descending process is ensured.

[0044] Referring to Figure 1 In an embodiment, the speed regulation sampling circuit 11 comprises a first transistor Q, the first end of the first transistor Q is connected to the first connecting line 10, and the second end of the first transistor Q is grounded.

[0045] In the above embodiment, the speed regulation sampling circuit 11 comprises a first transistor Q, wherein the first transistor Q can be a P-channel MOS tube or an N-channel MOS tube, the first end of the first transistor Q is connected to the first connecting line 10, the second end of the first transistor Q is grounded, the conduction degree of the transistor is adjusted, thereby adjusting the rotating speed of the driving motor M, the first transistor Q serves as a speed regulation tube, the current flowing through the driving motor M is controlled by changing the conduction state of the first transistor Q, thereby adjusting the rotating speed of the motor.

[0046] Further, the speed regulation sampling circuit 11 further comprises a second resistor R1, the second resistor R1 is a current sampling resistor, used for monitoring the current in the circuit, which is connected in series with the first transistor Q, the first end of the second resistor R1 is connected to the second end of the first transistor Q, and the second end is grounded, so that the current flowing through the second resistor R1 can directly reflect the working state of the driving motor M, since the voltage across the resistor is proportional to the current flowing through it, the current flowing through the driving motor M can be calculated by measuring the voltage across the resistor, thereby adjusting the transistor, ensuring the safety and stability of the system operation.

[0047] The above only describes the preferred embodiments of the present application, and does not limit the patent range of the present application, any equivalent structure or equivalent process transformation, or direct or indirect application in other related technical fields, which are included in the patent protection range of the present application.

Claims

1. A self-locking circuit, applied to a lifting system, characterized in that, This includes the power supply, drive motor, switch control unit, and steering control circuit; The power supply and the steering control circuit are respectively connected to the drive motor through the switch control unit, and the steering control circuit is grounded. The switch control unit is used to control the steering and / or locking state of the drive motor.

2. The self-locking circuit according to claim 1, characterized in that, The switch control unit includes a first relay, the first end of which is connected to the first end of the drive motor, and the second end of which is connected to the first end of the power supply or the first end of the steering control circuit.

3. The self-locking circuit according to claim 2, characterized in that, The switch control unit further includes a second relay, the first end of which is connected to the second end of the drive motor, and the second end of which is connected to the second end of the power supply or the second end of the steering control circuit.

4. The self-locking circuit according to claim 3, characterized in that, The self-locking circuit further includes a first resistor, the first end of which is connected to the first end of the drive motor, and the second end of which is connected to the second end of the power supply.

5. The self-locking circuit according to claim 3, characterized in that, When the self-locking circuit is de-energized, the first terminal of the first relay is connected to the first terminal of the drive motor, the second terminal of the first relay is connected to the first terminal of the power supply, the first terminal of the second relay is connected to the second terminal of the drive motor, and the second terminal of the second relay is connected to the second terminal of the power supply.

6. The self-locking circuit according to claim 3, characterized in that, When the drive motor rotates forward, the first end of the first relay is connected to the first end of the drive motor, the second end of the first relay is connected to the first end of the power supply, the first end of the second relay is connected to the second end of the drive motor, and the second end of the second relay is connected to the second end of the steering control circuit.

7. The self-locking circuit according to claim 3, characterized in that, When the drive motor reverses, the first terminal of the first relay is connected to the first terminal of the drive motor, the second terminal of the first relay is connected to the first terminal of the steering control circuit, the first terminal of the second relay is connected to the second terminal of the drive motor, and the second terminal of the second relay is connected to the second terminal of the power supply.

8. The self-locking circuit according to claim 3, characterized in that, The steering control circuit includes a first connecting line and a speed regulation sampling circuit. The two ends of the first connecting line are respectively used to connect to the second end of the first relay and the second end of the second relay. The first end of the speed regulation sampling circuit is connected to the first connecting line, and the second end of the speed regulation sampling circuit is grounded.

9. The self-locking circuit according to claim 8, characterized in that, The speed-regulating sampling circuit includes a first transistor, with a first terminal connected to the first connection line and a second terminal grounded.

10. The self-locking circuit according to claim 9, characterized in that, The speed regulation sampling circuit further includes a second resistor, which is connected in series with the first transistor. The first end of the second resistor is connected to the second end of the first transistor, and the second end of the second resistor is grounded.

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