An energy-saving brake with reliable operation

Abstract

A reliable energy-saving brake comprises a brake and an electric hydraulic cylinder connected to a control circuit and a locking and unlocking mechanism, wherein the hydraulic cylinder is mounted on the base of the brake, the top rod of the hydraulic cylinder is opposite to the operating lever on the upper part of the brake, the locking and unlocking mechanism comprises a locking plate, a locking spring and a tripping electromagnet, one end of the locking plate is rotatably connected to the base of the brake and is provided with a locking spring, the elastic force of the locking spring makes the locking plate close to the swing end of the operating lever, a slot corresponding to the swing end of the raised operating lever is provided on the locking plate, the tripping electromagnet is fixed on the operating lever of the brake, and the armature of the tripping electromagnet is opposite to the locking plate. The present invention adds a locking and unlocking mechanism on the basis of the traditional hydraulic brake, and the locking and releasing of the operating lever is realized by the locking and unlocking mechanism, so that the electric hydraulic cylinder only works at the initial start-up of the belt conveyor, thereby reducing the energy consumption of the hydraulic brake and reducing the failure rate of the hydraulic brake.

Description

Technical Field

[0001] The invention relates to a reliable energy-saving brake for a belt conveyor, which can effectively save the energy consumption of a hydraulic brake, reduce the temperature rise of a hydraulic cylinder, and extend the service life of the hydraulic cylinder, and belongs to the field of conveying technology. Background Art

[0002] Belt conveyors are generally equipped with brakes to prevent the conveyor from slipping, and to perform emergency braking on the conveyor when a fault occurs to prevent the fault from further expanding.

[0003] Hydraulic brake is a common brake for belt conveyors, mainly composed of a brake and an electric hydraulic cylinder (see Figure 1 ), when the belt conveyor stops running, the electric hydraulic cylinder installed on the brake base stops working, and the two brake shoes of the brake hold the high-speed shaft of the belt conveyor under the action of the brake spring inside the brake to brake the belt conveyor; when the belt conveyor is running, the drive motor inside the electric hydraulic cylinder is powered on, and the push rod of the electric hydraulic cylinder extends to lift the control lever of the brake, the brake opens, and the belt conveyor is braked. The disadvantage of this hydraulic brake is that the control lever of the brake cannot be self-locked after being lifted by the hydraulic cylinder. During the entire operation of the belt conveyor, the hydraulic cylinder is always in working state, and its drive motor must be running continuously, otherwise the control lever will fall under the action of the brake spring, and finally the belt conveyor is braked, which not only wastes electric energy, but also increases the temperature of the drive motor and hydraulic oil, and accelerates the aging of the motor insulation and hydraulic oil, which leads to reduced reliability of the hydraulic brake and increased failure rate, which seriously affects production efficiency and even causes shutdown accidents. Therefore, it is necessary to improve it. Summary of the invention

[0004] The purpose of the present invention is to provide a reliable energy-saving brake to address the shortcomings of the prior art, so as to reduce the energy consumption of the hydraulic brake, improve the operational reliability of the hydraulic brake, and ensure the normal operation of the belt conveyor.

[0005] The problem described in the present invention is solved by the following technical solution:

[0006] The invention discloses an energy-saving brake with reliable operation, which comprises a holding brake and an electric hydraulic cylinder connected to a control circuit and a locking and unlocking mechanism, wherein the hydraulic cylinder is installed on the base of the holding brake, and the top rod of the hydraulic cylinder is opposite to the operating lever on the upper part of the holding brake. The locking and unlocking mechanism comprises a locking plate, a locking spring and a release electromagnet, one end of the locking plate is rotatably connected to the base of the holding brake and is provided with a locking spring, the elastic force of the locking spring makes the locking plate close to the swing end of the operating lever, and a slot corresponding to the swing end of the raised operating lever is provided on the locking plate, and the release electromagnet is fixed on the operating lever of the holding brake, and the armature of the release electromagnet is opposite to the locking plate.

[0007] The above-mentioned energy-saving brake with reliable operation, the control circuit includes an intermediate relay, a motor contactor, a charging resistor, an energy storage capacitor and a micro switch, the micro switch is installed on the locking plate and corresponds to the raised operating lever, the control coil of the intermediate relay is connected to the AC power supply through the conveyor power switch, the control coil of the motor contactor, the normally open contact of the micro switch and the normally open contact of the intermediate relay are connected in series and then connected to the AC power supply through the conveyor power switch, the normally open contact of the motor contactor is connected in series in the power supply circuit of the hydraulic cylinder drive motor, the energy storage capacitor is connected to the DC power supply through the charging resistor, the control coil of the tripping electromagnet is connected in series with the normally closed contact of the intermediate relay and then connected to the energy storage capacitor.

[0008] The energy-saving brake with reliable operation is characterized in that the lower part of the slot on the locking plate is provided with a vertical slide groove matching the swing end of the operating lever.

[0009] In the above energy-saving brake with reliable operation, the DC power supply is a bridge rectifier, the AC input end of the bridge rectifier is connected to the AC power supply through the conveyor power switch, and the DC output end is connected to the energy storage capacitor through the charging resistor.

[0010] In the above energy-saving brake with reliable operation, a freewheeling diode is connected in parallel to the control coil of the tripping electromagnet.

[0011] In the above energy-saving brake with reliable operation, the control coil of the tripping electromagnet is connected in series with a current-limiting resistor.

[0012] In the above energy-saving brake with reliable operation, the end of the armature opposite to the locking plate is hemispherical.

[0013] The present invention adds a locking and unlocking mechanism on the basis of the traditional hydraulic brake, and realizes the locking and releasing of the operating lever through the locking and unlocking mechanism, so that the electric hydraulic cylinder only works at the initial start-up of the belt conveyor, thereby reducing the energy consumption of the hydraulic brake, reducing the failure rate of the hydraulic brake, and ensuring the normal operation of the belt conveyor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described below in conjunction with the accompanying drawings.

[0015] Figure 1 It is a schematic diagram of the structure of a traditional hydraulic brake;

[0016] Figure 2 This is the state when the belt conveyor is braked by the present invention;

[0017] Figure 3 This is the state when the present invention releases the brake on the belt conveyor;

[0018] Figure 4 It is a circuit schematic.

[0019] The numbers in the figure are: 1, base, 2, hydraulic cylinder, 3, operating lever, 4, brake spring, 5, locking spring, 6, locking plate, 7, armature, 8, slot, 9, slide, 10, reset spring, 11, brake, 12, brake shoe, KQL, conveyor power switch, KA, intermediate relay, KA1, normally open contact of intermediate relay, KA2, normally closed contact of intermediate relay, KM, motor contactor, ZQ, bridge rectifier, C1, energy storage capacitor, D1, freewheeling diode, DT, tripping electromagnet, R1, charging resistor, R2, current limiting resistor, SL, micro switch. DETAILED DESCRIPTION

[0020] The present invention provides an energy-saving brake with reliable operation, so as to save the electric energy consumption of the brake, reduce the temperature rise of the hydraulic cylinder, improve the reliability of the brake, extend the service life of the equipment, and reduce the failure rate.

[0021] See also Figure 2 , Figure 3 and Figure 4 The present invention mainly includes a brake 11, an electric hydraulic cylinder 2, a locking and unlocking mechanism and a control circuit, wherein the locking and unlocking mechanism includes a locking spring 5, a locking plate 6 and a tripping electromagnet DT, and the control circuit includes an intermediate relay KA, a motor contactor KM, a bridge rectifier ZQ, an energy storage capacitor C1, a freewheeling diode D1, a charging resistor R1, a current limiting resistor R2 and a micro switch SL.

[0022] The locking spring 5 and the locking plate 6 of the locking and unlocking mechanism are installed on the base 1 of the brake 11, and the tripping electromagnet DT is installed on the operating lever 3 of the brake 11. The force of the locking spring 5 can make the locking plate 6 rotate counterclockwise. There is a card slot 8 on the locking plate 6 for locking the operating lever 3 of the brake 11, and a micro switch SL is installed in the card slot 8.

[0023] The tripping electromagnet DT is composed of a control coil, an armature 7 and a reset spring 10; when the control coil is energized, the armature 7 can move to the right, and the force of the reset spring 10 is opposite to the force of the control coil. The front end of the armature 7 is hemispherical, and its diameter is larger than the width of the slot 8 on the locking plate 6 to ensure that the armature 7 will not be stuck in the slot 8. A vertical slide 9 is provided at the bottom of the slot 8. The slide 9 is a guide groove for the operating lever 3, which can prevent the swing end of the operating lever 3 from being stuck in the slot 8.

[0024] When starting the belt conveyor, close the conveyor power switch KQL, the control coil of the intermediate relay KA is energized, the normally open contact KA1 of the intermediate relay is closed, and the normally closed contact KA2 of the intermediate relay is disconnected, so that the control coil of the motor contactor KM is energized, and its normally open contact is closed, the driving motor inside the electric hydraulic cylinder 2 starts, the push rod of the hydraulic cylinder 2 extends and lifts the operating lever 3 of the brake 11, and the two brake shoes 12 of the brake release the high-speed shaft of the belt conveyor, releasing the brake on the belt conveyor, and the belt conveyor can operate normally. When the operating lever 3 reaches a certain height, its swing end is stuck in the card slot 8 on the locking plate 6. At the same time, the swing end of the operating lever 3 triggers the micro switch SL installed on the locking plate 6, and the normally closed contact of the micro switch SL is disconnected, so the control coil of the motor contactor KM loses power, its normally open contact is disconnected, and the drive motor of the electric hydraulic cylinder 2 stops running. At this time, the operating lever 3 is locked in a high position by the locking and unlocking mechanism and will not fall under the action of the brake spring 4, which not only avoids energy waste, but also prolongs the service life of the electric hydraulic cylinder 2. During the operation of the belt conveyor, the bridge rectifier ZQ converts AC power into DC power to charge the energy storage capacitor C1. The charging resistor R1 is used to limit the size of the charging current to prevent the bridge rectifier ZQ from being damaged by excessive current. When the belt conveyor needs to stop, turn on the conveyor power switch KQL, the control coil of the intermediate relay KA loses power, the normally closed contact KA2 of the intermediate relay closes, and the voltage across the energy storage capacitor C1 is added to the control coil of the tripping electromagnet DT through the normally closed contact KA2 of the intermediate relay and the current limiting resistor R2. The armature 7 of the tripping electromagnet DT extends out and pushes open the locking plate 6, and the swing end of the operating lever 3 disengages from the slot 8 on the locking plate 6, so that the operating lever 3 falls, and the brake 11, under the action of its internal brake spring 4, holds the high-speed shaft of the belt conveyor tightly to brake the belt conveyor.

[0025] The armature 7 of the tripping electromagnet DT is provided with a reset spring 10. When the control coil of the tripping electromagnet DT loses power, the reset spring 10 can retract the armature 7.

[0026] A freewheeling diode D1 is connected in parallel to the control coil of the tripping electromagnet DT. Its function is to provide a flow path for the surge current generated by the control coil of the tripping electromagnet DT when the normally closed contact KA2 of the intermediate relay is suddenly disconnected, thereby preventing excessive surge voltage from damaging other components.

[0027] The invention has a simple structure, is flexible, reliable, economical and practical. The device enables the hydraulic cylinder to work only for a short time when the belt motor is started, and is in a stopped state during the normal operation of the belt motor, which greatly saves power consumption, extends the service life of the hydraulic cylinder, greatly reduces the maintenance rate, and effectively ensures smooth production.

Claims

1. A reliable energy-saving brake, characterized in that: The structure includes a brake (11) and an electric hydraulic cylinder (2) connected to a control circuit and a locking and unlocking mechanism, wherein the electric hydraulic cylinder (2) is installed on the base (1) of the brake (11), the top rod of the electric hydraulic cylinder (2) is opposite to the operating lever (3) on the upper part of the brake (11), and the locking and unlocking mechanism includes a locking plate (6), a locking spring (5) and a release electromagnet (DT), one end of the locking plate (6) is rotatably connected to the base (1) of the brake (11) and is provided with a locking spring (5), the elastic force of the locking spring (5) makes the locking plate (6) close to the swing end of the operating lever (3), and a slot (8) corresponding to the swing end of the raised operating lever (3) is provided on the locking plate (6), and the release electromagnet (DT) is fixed on the operating lever (3) of the brake (11), and the armature (7) of the release electromagnet (DT) is opposite to the locking plate (6); The control circuit comprises an intermediate relay (KA), a motor contactor (KM), a charging resistor (R1), an energy storage capacitor (C1) and a micro switch (SL). The micro switch (SL) is mounted on a locking plate (6) and corresponds to the raised operating lever (3). The control coil of the intermediate relay (KA) is connected to an AC power supply through a conveyor power switch (KQL). The control coil of the motor contactor (KM), the normally open contact of the micro switch (SL) and the normally open contact (KA1) of the intermediate relay are connected in series and then connected to an AC power supply through the conveyor power switch (KQL). The normally open contact of the motor contactor (KM) is connected in series to a power supply circuit of a driving motor of an electric hydraulic cylinder (2). The energy storage capacitor (C1) is connected to a DC power supply through a charging resistor (R1). The control coil of a tripping electromagnet (DT) is connected in series to a normally closed contact (KA2) of an intermediate relay and then connected to the energy storage capacitor (C1). A vertical slide groove (9) matching the swing end of the operating lever (3) is provided at the lower part of the slot (8) on the locking plate (6); The DC power supply is a bridge rectifier (ZQ), the AC input end of the bridge rectifier (ZQ) is connected to the AC power supply through a conveyor power switch (KQL), and the DC output end is connected to the energy storage capacitor (C1) through a charging resistor (R1); A freewheeling diode (D1) is connected in parallel to the control coil of the tripping electromagnet (DT); The control coil of the tripping electromagnet (DT) is connected in series with a current-limiting resistor (R2).

2. A reliable energy-saving brake according to claim 1, characterized in that: The end of the armature (7) opposite to the locking plate (6) is hemispherical.

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