A brake release control system

Abstract

The present invention mainly relates to the field of engineering vehicles, and specifically relates to a brake release control system. This system includes a power supply, the positive and negative poles of the power supply are respectively connected to a motor driver through wires, the motor driver is connected to an electronic control unit, and the electronic control unit is connected to a power control unit; a main switch is provided on the wire connecting the power supply and the motor driver; before the main switch, it is sequentially connected to the electronic control unit through an emergency switch and a key switch; between the electronic control unit and the motor driver, there are also connected a left and right brake coil, a left and right steering coil, and a platform lifting coil, and the electronic control unit is connected to the left and right brake coils through parallel left and right brake output branches and left and right brake state branches; when the time-delay relay is in the conducting state, the power supply will supply power to the left and right brake coils, causing them to generate a magnetic field and electromotive force; when current passes through the time-delay relay, the switch will automatically resume the conducting state, and at the end of the time delay, the brake coil will automatically lose power, without manual intervention, which can improve the convenience and safety of operation.

Description

Technical Field

[0001] The present invention mainly relates to the field of engineering vehicles, and specifically relates to a brake release control system. Background Art

[0002] The electric drive scissor lift work platform is a common mechanical device, usually used in construction sites, warehouses, equipment installation and other fields. This lift work platform is generally composed of a motor, a reducer, a scissor lift mechanism, a control system, etc.

[0003] The braking system is an important part of the lift work platform. It can control the lifting speed and position of the platform to ensure the stability and safety of the platform during use. In case of an emergency, the braking system can prevent the platform from falling. In addition, in case of an emergency, such as a power failure, a control system failure, etc., the traditional braking system may not be able to start in time and effectively, and cannot prevent the platform from falling, which will pose a threat to the life safety of the user.

[0004] Therefore, in view of these problems, it is necessary to realize the intelligence and automation of the system. Summary of the Invention

[0005] To solve the above problems, the present invention adopts the following technical solutions.

[0006] A brake release control system includes a power supply. The positive and negative poles of the power supply are respectively connected to a motor driver through wires. The motor driver is connected to an electronic control unit, and the electronic control unit is connected to a power control unit. Between the electronic control unit and the motor driver, there are also connected left and right brake coils, left and right steering coils, and a platform rising coil. The electronic control unit is connected to the left and right brake coils through parallel left and right brake output branches and left and right brake state branches; the motor driver is connected to a telematics port and a power control unit.

[0007] Further, a main switch is provided on the wire connecting the power supply and the motor driver. Before the main switch, there are sequentially connected an emergency switch and a key switch to the electronic control unit.

[0008] Further, the key switch is respectively connected to the electronic control unit and the power supply, and controls the connection relationship between the electronic control unit and the power supply.

[0009] Further, the key switch adopts a three-position switch, including an upper control mode, a power-off mode, and a lower control mode respectively.

[0010] Further, the electronic control unit is connected to a platform descending coil. The platform descending coil is connected to the main switch through the key switch and the emergency switch. The main switch is provided on the wire connecting the power supply and the motor driver;

[0011] Further, the platform descending coil includes a solenoid valve and a valve core. An electromagnetic coil is provided in the solenoid valve, and the valve core is lifted by the electromagnetic force of the magnetic field formed by the electromagnetic coil. The platform descends through a falling channel.

[0012] Further, the electronic control unit is connected with a pressure sensor and an angle sensor, and the pressure sensor and the angle sensor are connected to the power control unit.

[0013] Further, the electronic control unit is connected with a travel limit switch and a height limit switch, and the travel limit switch and the height limit switch are connected to the power control unit.

[0014] Further, the left and right braking output branches and the left and right braking state branches are respectively connected to the left and right brake coils, and the left and right brake coils are also connected to the power supply through a time delay relay.

[0015] Further, the electronic control unit is connected with an alarm.

[0016] The beneficial effects of the present invention are as follows:

[0017] The left and right brake coils of the present invention are connected to the power supply through a time delay relay, which means that when the time delay relay is in the conducting state, the power supply will supply power to the left and right brake coils, enabling them to generate a magnetic field and electromotive force. At the same time, the series-connected buzzer sounds to remind the operator that the current is in the brake release state. This design enables convenient control of the energization state of the brake coils when needed, thereby realizing the braking control of the lifting work platform. At the same time, due to the characteristics of the time delay relay, when current passes through the time delay relay, the switch will automatically return to the conducting state. When the time delay ends, the brake coils automatically lose power. When the brake coils lose power, the brake release ends and the buzzer stops sounding, without manual intervention, which can improve the convenience and safety of operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a brake release control system of the present invention.

[0019] Figure 2 It is a schematic structural diagram of the platform descending coil of the present invention.

[0020] Figure 3 It is a schematic structural diagram of the semiconductor chip of the present invention.

[0021] Figure 4 It is a schematic diagram for measuring the inclination angle of the present invention.

[0022] Figure 5 It is a schematic structural diagram of the limit switch of the present invention.

[0023] Figure 6This is a circuit schematic diagram of the left and right braking output branches and the left and right braking state branches of the present invention.

[0024] Among them, 1 is the power supply; 2 is the motor driver; 3 is the electronic control unit; 4 is the power control unit; 5 is the main switch; 6 is the emergency switch; 7 is the key switch; 8 is the left and right braking output branches; 9 is the left and right braking state branches; 10 is the left and right steering coils; 11 is the platform rising coil; 12 is the telematics port; 13 is the platform descending coil; 14 is the pressure sensor; 15 is the angle sensor; 16 is the limit switch; 17 is the height limit switch; 18 is the time delay relay; 19 is the alarm; 20 is the left and right brake coils; 21 is the valve seat; 22 is the coil; 23 is the spring; 24 is the valve core; 25 is the sealing ring. Specific embodiments

[0025] The following further details the content of the present invention in conjunction with the accompanying drawings.

[0026] A brake release control system includes a power supply 1, the positive and negative poles of the power supply 1 are respectively connected to the motor driver 2 through wires, the motor driver 2 is connected to the electronic control unit 3, and the electronic control unit 3 is connected to the power control unit 4;

[0027] A main switch 5 is provided on the wire connecting the power supply 1 and the motor driver 2; the emergency switch 6 and the key switch 7 are sequentially connected to the electronic control unit 3 in front of the main switch 5; the left and right brakes 20, the left and right steering coils 10 and the platform rising coil 11 are also connected between the electronic control unit 3 and the motor driver 2, and the electronic control unit 3 is connected to the left and right brake coils 20 through the parallel left and right braking output branches 8 and left and right braking state branches 9; the motor driver 2 is connected to the telematics port 12 and the power control unit 4;

[0028] The key switch can control the connection relationship between the electronic control unit 3 and the power supply 1.

[0029] The electronic control unit 3 is connected with a platform descending coil 13, the platform descending coil 13 is connected to the main switch 5 through the key switch 7 and the emergency switch 6, and the main switch 5 is arranged on the wire connecting the power supply 1 and the motor driver 2;

[0030] The electronic control unit 3 is connected with an alarm 19, which is connected to the electronic control unit 3 and the power control unit 4.

[0031] The electronic control unit 3 is connected with a pressure sensor 14 and an angle sensor 15, and the pressure sensor 14 and the angle sensor 15 are connected to the power control unit 4.

[0032] The electric control unit 3 is connected with a travel limit switch 16 and a height limit switch 17, and the travel limit switch 16 and the height limit switch 17 are connected to the power control unit 4.

[0033] The left and right brake output branches 8 and the left and right brake state branches 9 are respectively connected with the left and right brake coils 20, and the left and right brake coils 20 are also connected to the power supply 1 through a time-delay relay 18.

[0034] As a further implementation manner,

[0035] In this embodiment, a main switch is provided on the wire connecting the power supply and the motor driver; the emergency switch and the key switch are sequentially connected to the electric control unit in front of the main switch; the left and right brake coils, the left and right steering coils and the platform lifting coil are also connected between the electric control unit and the motor driver, and the electric control unit is connected to the left and right brake coils through the parallel left and right brake output branches and the left and right brake state branches; the motor driver is connected to the telematics port and the power control unit;

[0036] The key switch can control the connection relationship between the electric control unit and the power supply.

[0037] Among them,

[0038] 1. The key switch is a three-position switch corresponding to three states: the upper control mode, power-off, and the lower control mode.

[0039] The power supply of the key switch is constantly powered on, coming from the battery, and is continuously supplied to the key switch through a fuse and an emergency stop switch

[0040] 2. The controlled power of the whole vehicle is controlled by the power relay KAI. If the coil of KA1 loses power, the whole vehicle will be powered off.

[0041] 3. The J1-14 line is the signal line for the lower control mode.

[0042] When the key switch is in the upper position, J1-14 is not powered on, the ECU does not receive the high-level signal of the key switch, and the ECU enters the upper control mode. At this time, the whole vehicle actions will be controlled by the PCU located on the machine working platform.

[0043] When the switch is turned to the lower position, J1-14 is powered on, the ECU receives the high-level signal of the key switch, and the ECU enters the lower control mode. At this time, the actions can be controlled by the ECU.

[0044] When the key switch is in the middle position, 5P loses power, the coil of the power relay KAI loses power, the whole machine is powered off, and all the controlled power and the ECU power supply lose power.

[0045] The electronic control unit is connected to a platform lowering coil, and the platform lowering coil is connected to the main switch through a key switch and an emergency switch. The main switch is arranged on the connecting wire between the power supply and the motor driver.

[0046] Among them, the structure of the platform lowering coil is as Figure 2 shown. The platform lowering coil includes a 21 valve seat, a 22 coil, a 23 spring, a 24 valve core, and a 25 sealing ring. When the electromagnetic coil of the solenoid valve is powered on, a magnetic field is formed, the valve core is lifted by the electromagnetic force, allowing fluid to pass through. At this time, the platform will fall, and the oil output of the oil outlet will decrease. When powered off, the electromagnetic force disappears, the spring falls, the channel is blocked, and the fall stops, thereby controlling the oil output of the oil outlet.

[0047] The electronic control unit is connected to an alarm, which is connected to the electronic control unit and the power control unit.

[0048] The electronic control unit is connected to a pressure sensor and an angle sensor, and the pressure sensor and the angle sensor are connected to the power control unit.

[0049] Specifically, as Figure 3 shown,

[0050] 1. When the sensor is in a pressure medium, which is hydraulic oil in this case, the oil pressure acts on the corrugated diaphragm, causing the silicone oil inside to be pressurized. The silicone oil transfers the pressure of the diaphragm to the semiconductor chip. After being pressurized, the resistance value of the chip changes. The resistance signal is led out through the lead wire and connected to a Wheatstone bridge. When the resistance of the chip changes, the bridge loses balance and outputs an electrical signal corresponding to the pressure. The signal is two 4 - 20 mA current signals.

[0051] As Figure 4 shown,

[0052] 2. By measuring the component of the gravitational acceleration in the direction of the object's tilt, the tilt angle of the object is calculated. There is an accelerometer inside the tilt angle sensor that can sense the direction of gravity. When the object tilts, the sensor will sense the change in gravity. Through internal calculation and processing, the tilt angle θ of the object is obtained, and a 0 - 4.5 V voltage signal is output.

[0053] The electronic control unit is connected to a travel limit switch and a height limit switch, and the travel limit switch and the height limit switch are connected to the power control unit.

[0054] The specific circuit structure and working principle of the electronic control unit

[0055] As Figure 5The figure shows a limit switch, specifically a pulley type travel switch. Its principle is similar to that of a switch, being normally open or normally closed. One end is connected to the power supply, and the other end is connected to the ECU. When the roller of the limit switch is triggered, its initial state changes. The ECU receives a high level or a low level, triggering the corresponding vehicle length limit or height limit function.

[0056] The left and right brake output branches and the left and right brake state branches are respectively connected to the left and right brake coils, and the left and right brake coils are also connected to the power supply through a time delay relay.

[0057] Among them, the specific circuit structures of the left and right brake output branches and the left and right brake state branches are as Figure 6 shown. Among them Figure 6 The time delay relay shown is of the type that delays disconnection. When the key switch is turned on and the power supply A1+ is connected to 8D, the time delay relay works, the brake release coil is energized, and the braking starts to be released. At the same time, the buzzer sounds to indicate the brake release. When the time delay ends, the relay stops working, the buzzer stops sounding, and the braking is restored.

[0058] Through the above specific embodiments, those skilled in the art of the said technical field can easily implement the present invention. However, it should be understood that the present invention is not limited to the above specific embodiments. Based on the disclosed embodiments, those skilled in the art of the said technical field can arbitrarily combine different technical features to thus implement different technical solutions.

Claims

1. A brake release control system, characterized in that: It includes a power supply, the positive and negative electrodes of the power supply are respectively connected to the motor driver through wires, the motor driver is connected to the electronic control unit, and the electronic control unit is connected to the power control unit; left and right brake coils, left and right steering coils and platform lifting coils are also connected between the electronic control unit and the motor driver, and the electronic control unit is connected to the left and right brake coils through parallel left and right brake output branches and left and right brake status branches; the motor driver is connected to the telematics port and the power control unit; A main switch is provided on the wire connecting the power supply and the motor driver, and the main switch is connected to the electronic control unit through an emergency switch and a key switch in sequence; The key switch is respectively connected to the electric control unit and the power supply, and controls the connection relationship between the electric control unit and the power supply; The key switch adopts a three-position switch, corresponding to the three states of upper control mode, power off, and lower control mode; The electric control unit is connected to a platform descending coil, and the platform descending coil is connected to a main switch through a key switch and an emergency switch, and the main switch is arranged on a connecting wire between the power supply and the motor driver; The platform descending coil comprises an electromagnetic valve and a valve core, wherein the electromagnetic valve is provided with an electromagnetic coil, the valve core is lifted by the electromagnetic force of the magnetic field formed by the electromagnetic coil, and the platform falls through the falling channel; The electronic control unit is connected to a pressure sensor and an angle sensor, and the pressure sensor and the angle sensor are connected to the power control unit; The electronic control unit is connected with a travel limit switch and a height limit switch, and the travel limit switch and the height limit switch are connected with the power control unit; The left and right brake output branches and the left and right brake status branches are respectively connected to the left and right brake coils, and the left and right brake coils are also connected to the power supply through a time delay relay; The electronic control unit is connected to an alarm; Among them, the platform descending coil includes a valve seat, a coil, a spring, a valve core and a sealing ring. When the electromagnetic coil of the solenoid valve is powered on, a magnetic field is formed, and the valve core is lifted by the electromagnetic force to allow the fluid to pass through. At this time, the platform will fall, and the oil output from the oil outlet will decrease. When the power is off, the electromagnetic force disappears, the spring falls, the channel is blocked, and the falling stops, thereby controlling the oil output from the oil outlet.

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