Braking system driven by double pushers

Abstract

The utility model discloses a braking system driven by double pushers, which comprises a braking mechanism, the pushers, a control box, a UPS (uninterrupted power supply), a local control switch and a cab control switch, the pushers comprise a first alternating-current pusher and a second alternating-current pusher, the first alternating-current pusher and the second alternating-current pusher are mounted side by side, and the first alternating-current pusher and the second alternating-current pusher are connected with the control box. A single-phase frequency converter is arranged in the control box, a local control switch is arranged on the control box, the local control switch and the cab control switch are connected to the control end of the single-phase frequency converter in parallel, the single-phase frequency converter is electrically connected with the second alternating current pusher, and the UPS is electrically connected with the single-phase frequency converter. According to the utility model, a standby power supply is provided by the UPS, an operator operates the local control switch or the cab control switch to control the output of the single-phase frequency converter so as to control the on-off of the second alternating current pusher, the repeated opening and closing actions of the brake are realized, a hoisted workpiece is quickly and safely put down, and the frequency converter is timely in control response, safe and reliable.

Description

Technical Field

[0001] The utility model relates to a braking system for a crane hoisting mechanism, in particular to a braking system driven by double pushers. Background Art

[0002] During the operation of a crane hoisting mechanism, if the power grid suddenly loses and the brake is applied suddenly, causing the suspended workpiece to be suspended in mid-air, if the brake needs to be released and the workpiece lowered by the hoisting mechanism, the industry usually adopts the following practices:

[0003] 1. The brake has a manual release function, and the brake frame is equipped with a handle or jack. During the release operation, the operator pulls the handle or jack on the brake to eliminate the braking force on the brake shoe (brake disc), release the brake, and let the workpiece fall. However, when operating the jack or handle, the braking force is eliminated at one time, and the magnitude of the braking force cannot be controlled, so the descending speed of the workpiece cannot be controlled. The speed is fast and the inertia force is large when falling, and the workpiece is easily damaged or hits the ground.

[0004] 2. Use the "brake with controllable release in case of power failure" disclosed in announcement number CN203612873U. It includes a DC electric push rod, a brake mechanism and a control box. When the crane suddenly loses power, the DC motor on the electric push rod is powered by the battery in the control box. The operator presses the release button on the control box to control the DC motor to rotate forward. Under the side effect of the movement of the spring seat, screw and guide key inside the push rod, the spring seat produces axial upward displacement, gradually compressing the spring. The push rod transmits the gradually increasing spring force to the brake mechanism, and gradually offsets the braking force on the brake mechanism. When the braking force on the brake mechanism is insufficient to brake the suspended workpiece, the workpiece begins to fall. When the workpiece falls too fast, the operator presses the brake button on the control box to control the DC motor to reverse, causing the spring seat to produce axial downward displacement, gradually relaxing the spring, and gradually reducing the thrust transmitted to the brake mechanism. The corresponding braking force of the brake mechanism gradually increases, thereby slowing the falling speed of the workpiece and achieving controllable release in case of power failure. However, in actual application of this utility model, the operator's proficiency is required to be high. During operation, when the braking force is insufficient to stop the suspended workpiece and it starts to fall, the correct operation should be to immediately press the reverse button to load the torque. If the reverse loading torque is started when the workpiece falls rapidly, the reversal speed of the push rod will not be enough to brake the suspended workpiece, which will cause the operation to fail and the workpiece to be damaged or hit the ground. Summary of the Invention

[0005] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a braking system driven by a double pusher.

[0006] In order to achieve the above purpose, the present invention is implemented through the following technical solutions:

[0007] A dual-thruster driven braking system includes a braking mechanism, a thruster, a control box, a UPS power supply, an on-site control switch and a cab control switch, wherein the braking mechanism includes a base, a brake shoe, a brake arm, a pull rod, a brake spring and a triangular lever, and the thruster includes a first AC thruster and a second AC thruster, the first AC thruster and the second AC thruster are installed side by side, the upper ends of the first AC thruster and the second AC thruster are respectively connected to the triangular lever, and the lower ends of the first AC thruster and the second AC thruster are respectively connected to the base, a single-phase frequency converter is provided in the control box, and an on-site control switch is provided on the control box, the on-site control switch and the cab control switch are connected in parallel to the control end of the single-phase frequency converter for controlling the action of the second AC thruster, the single-phase frequency converter is electrically connected to the second AC thruster, the UPS power supply is electrically connected to the single-phase frequency converter, and the single-phase frequency converter converts single-phase 220V AC power into output three-phase AC 220V AC power to drive the second AC thruster to work.

[0008] Furthermore, the stroke of the second AC actuator is greater than the stroke of the first AC actuator.

[0009] Furthermore, a U-shaped groove is provided on the push rod head of the second AC pusher, and the push rod head is connected to the triangular lever via a pin passing through the U-shaped groove.

[0010] Furthermore, the control box is fixedly mounted on the side of the second AC actuator via a bracket and is integrated with the second AC actuator.

[0011] Furthermore, the first AC propeller power supply adopts three-phase AC380V, the motor of the first AC propeller adopts star connection, the second AC propeller power supply adopts three-phase AC220V, and the motor of the second AC propeller adopts triangle connection.

[0012] Furthermore, the local control switch and the driver's cab control switch are spring-return button switches and / or knob switches.

[0013] Beneficial effects of the utility model:

[0014] This utility model provides a dual-thruster-driven braking system. In the event of a sudden power outage, a UPS provides backup power. The operator operates a local control switch or a control switch in the driver's cab to control the output of a single-phase frequency converter, thereby controlling the on-off of a second AC thruster, achieving repeated opening and closing of the brake, allowing the suspended workpiece to be quickly and safely lowered. The system features a simple structure, convenient operation, mature technology, and timely, safe, and reliable frequency converter control. Compared to CN203612873U, this system avoids the potential risks of delayed response and insufficient braking force causing the brake to lose controllable operation, resulting in damage to the workpiece or damage to the ground. This utility model is particularly suitable for use in hoisting mechanisms of cranes such as quenching cranes and electromagnetic cranes. In the event of an accidental power outage, the system, driven by a second AC thruster, enables the workpiece to be lowered promptly, smoothly, and safely. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of a preferred embodiment 1 of the present utility model;

[0016] Figure 2 This is a power supply diagram for the second AC actuator in a preferred embodiment of the present invention;

[0017] Figure 3 This is a schematic structural diagram of Example 2 of the present utility model;

[0018] In the figure: it includes a base 1, a brake shoe 2, a brake arm 3, a pull rod 4, a brake spring 5, a triangular lever 6, a first AC pusher 7, a second AC pusher 8, a control box 9, a UPS power supply 10, a driver's cab control switch 11, a U-shaped groove 81, and a local control switch 92. DETAILED DESCRIPTION

[0019] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0020] Example 1: See Figure 1 and Figure 2As shown, a dual-propellant driven braking system includes a braking mechanism, a propeller, a control box 9, a UPS power supply 10, a local control switch 92 and a cab control switch 11, wherein the braking mechanism includes a base 1, a brake shoe 2, a brake arm 3, a pull rod 4, a brake spring 5 and a triangular lever 6, and the propeller includes a first AC propeller 7 and a second AC propeller 8. The first AC propeller 7 and the second AC propeller 8 are installed side by side. The upper ends of the first AC propeller 7 and the second AC propeller 8 are respectively connected to the triangular lever 6, and the lower ends of the first AC propeller 7 and the second AC propeller 8 are respectively connected to the base 1. A single-phase The inverter 91 and control box 9 are equipped with a local control switch 92. The local control switch 92 and the cab control switch 11 are connected in parallel to the control terminal of the single-phase inverter 91 to control the operation of the second AC actuator 8. The single-phase inverter 91 is electrically connected to the second AC actuator 8. The UPS power supply 10 is electrically connected to the single-phase inverter 91. The single-phase inverter 91 converts single-phase 220V AC power into three-phase 220V AC power to drive the second AC actuator 8. The UPS power supply 10 has single-phase AC 220V input and output, providing backup power for the control box 9 and the second AC actuator 8 in the event of a power outage. In this embodiment, the first AC actuator 7 is used to drive the brake during the lifting and lowering of the hoisting mechanism. The first AC actuator 7 is controlled by the main control unit and operates in the same principle as a conventional lift brake actuator. The second AC actuator 8 is a backup actuator and is controlled by the control box 9. The UPS power supply 10 provides backup power for accurately releasing the brake in an emergency.

[0021] In this embodiment, a U-shaped groove 81 is provided on the push rod head of the second AC pusher 8, and the push rod head is connected to the triangular lever 6 via a pin passing through the U-shaped groove 81. When the lifting mechanism is operating normally, the first AC pusher 7 is electrically lifted, driving the pin connected to the triangular lever to move freely within the U-shaped groove 81 of the push rod head of the second AC pusher 8. At the same time, when the brake is engaged, the pin reserves a section of idle travel downward to compensate for the space required for the first AC pusher 7 to move downward in conjunction with the reduction in the compensation stroke due to brake pad wear. At the same time, the stroke of the second AC pusher 8 is configured to be greater than the stroke of the first AC pusher 7. The stroke difference is calculated based on the installation position of the two pushers and the lever ratio of the triangular lever 6.

[0022] In this embodiment, the control box 9 is fixedly mounted on the side of the second AC actuator 8 through a bracket and is integrated with the second AC actuator 8 , which is convenient for installation and facilitates on-site operation and control of the second AC actuator 8 .

[0023] In this embodiment, the power supply of the first AC propeller 7 adopts three-phase AC380V, and the motor of the first AC propeller 7 adopts star connection. The power supply of the second AC propeller 8 adopts three-phase AC220V, and the motor of the second AC propeller 8 adopts triangle connection.

[0024] The working principle of this embodiment is as follows: when the brake is in normal working state, the second AC pusher 8 does not work, and the brake is powered on and off by the main control of the first AC pusher 7, releasing and closing the brake; in the case of a sudden power outage, if the brake needs to be released and the workpiece suspended in the air needs to be lowered, the UPS power supply 10 provides power, the output of the UPS power supply 10 is connected to the single-phase frequency converter 91, and the output of the single-phase frequency converter 92 is connected to the motor of the second AC pusher 8. The operator controls the output of the single-phase frequency converter 91 by controlling the local control switch 92 or the driver's cab control switch 11, and the second AC pusher 8 is powered on and lifted up, and the workpiece is lowered through the triangular lever 6, the brake rod 4, The brake arm 3 and the brake shoe 2 transmit the thrust, further compressing the brake spring 5, eliminating the spring force on the brake shoe 2, releasing the brake, and the workpiece begins to fall rapidly. At this time, the operator controls the cab control switch 11 or the local control switch 92 to disconnect, controls the single-phase inverter 91 to block the output, and the second AC pusher 8 is powered off and reset. The brake is transmitted through the triangular lever 6, the brake rod 4, the brake arm 3, and the brake shoe 2, and the spring force of the brake spring 5 is quickly applied to the brake shoe 2 to implement rapid braking. The cab control switch 11 or the local control switch 92 is repeatedly controlled on and off, so that the brake can be frequently activated to quickly and safely lower the suspended workpiece.

[0025] In this embodiment, the local control switch 92 and the driver's cab control switch 11 can be a spring-reset push button switch or a knob switch. When the knob switch is configured in the form of a potentiometer knob, the operation is different from that of the spring-reset push button switch. It is set to be controlled by a voltage signal through the analog channel of the single-phase inverter 91. During emergency operation, the operator repeatedly rotates the potentiometer knob to output a linear potentiometer signal to the single-phase inverter 92, which can control the output frequency of the single-phase inverter 92 in real time, thereby controlling the motor speed of the second AC pusher 8, and further controlling the thrust of the pusher, thereby controlling the braking force acting on the workpiece, accurately releasing the brake, and realizing rapid and safe lowering of the workpiece.

[0026] Example 2: See Figure 3 As shown, the difference from Example 1 is that the braking dual part is different. The braking dual part of Example 1 is a brake drum, and the braking dual part of Example 2 is a brake disc. The structural composition and working principle of the two are the same.

[0027] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0028] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A dual-thruster driven braking system, characterized in that: The invention comprises a braking mechanism, a pusher, a control box (9), a UPS power supply (10), a local control switch (92) and a driver's cab control switch (11), wherein the braking mechanism comprises a base (1), a brake shoe (2), a brake arm (3), a pull rod (4), a brake spring (5) and a triangular lever (6), and the pusher comprises a first AC pusher (7) and a second AC pusher (8), wherein the first AC pusher (7) and the second AC pusher (8) are installed side by side, and the upper ends of the first AC pusher (7) and the second AC pusher (8) are respectively connected to the triangular lever (6), and the first AC pusher (7) and the second AC pusher (8) are respectively connected to the triangular lever (6). The lower ends are respectively connected to the base (1). A single-phase frequency converter (91) is provided in the control box (9). A local control switch (92) is provided on the control box (9). The local control switch (92) and the driver's cab control switch (11) are connected in parallel to the control end of the single-phase frequency converter (91) for controlling the action of the second AC propeller (8). The single-phase frequency converter (91) is electrically connected to the second AC propeller (8). The UPS power supply (10) is electrically connected to the single-phase frequency converter (91). The single-phase frequency converter (91) converts the single-phase 220V AC power into output three-phase 220V AC power to drive the second AC propeller (8) to work.

2. A dual-thruster driven braking system according to claim 1, characterized in that: The stroke of the second AC propeller (8) is greater than the stroke of the first AC propeller (7).

3. The dual-thruster driven braking system according to claim 1, characterized in that: A U-shaped groove (81) is provided on the push rod head of the second AC pusher (8), and the push rod head is connected to the triangular lever (6) via a pin passing through the U-shaped groove (81).

4. The dual-thruster driven braking system according to claim 1, characterized in that: The control box (9) is fixedly mounted on the side of the second AC propeller (8) via a bracket and is connected to the second AC propeller (8) as a whole.

5. The dual-thruster driven braking system according to claim 1, characterized in that: The power supply of the first AC propeller (7) adopts three-phase AC380V, and the motor of the first AC propeller (7) adopts a star connection method; the power supply of the second AC propeller (8) adopts three-phase AC220V, and the motor of the second AC propeller (8) adopts a delta connection method.

6. The dual-thruster driven braking system according to claim 1, characterized in that: The local control switch (92) and the driver's cab control switch (11) are spring-return button switches or knob switches.

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