A two-stage hydraulic brake and a braking method thereof

Abstract

The present application relates to a kind of two-stage hydraulic brake and its braking method, the two-stage hydraulic brake includes motor, first reversing valve, second reversing valve, hydraulic system, throttle valve and brake;When first reversing valve and motor are de-energized, second reversing valve keeps energized state, then the hydraulic system loses pressure, the throttle valve makes the pressure oil of the brake drop to second stage low pressure work interval, second reversing valve loses power after preset time, so that brake closure realizes normal braking;When first reversing valve, second reversing valve and motor are de-energized, then the hydraulic system loses pressure, the throttle valve makes the pressure oil of the brake drop to third stage low pressure work interval, brake closure realizes emergency braking.The present application can realize flexible braking and emergency braking according to actual working condition demand, can realize brake time adjustable, brake torque adjustable according to the size of load.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of brake, in particular to a two-stage hydraulic brake and a braking method thereof. BACKGROUND

[0002] The brake is a mechanical part that stops or slows down the moving parts in the machine, commonly known as brake or brake. The existing hydraulic solution, including flexible brake and emergency brake, generally adopts flexible control to reduce the impact and damage of the brake on the belt conveyor equipment, but when emergency braking is needed, if the load is large, the braking time is too long due to inertia. SUMMARY

[0003] The present application provides a two-stage hydraulic brake and a braking method thereof, which can realize flexible braking and emergency braking according to the actual working condition requirements, and can realize adjustable braking time and adjustable braking torque according to the size of the load. The present application provides the following technical solutions to solve the above problems mentioned in the background art:

[0004] The present application provides a two-stage hydraulic brake, comprising a motor, a first reversing valve, a second reversing valve, a hydraulic system, a throttle valve and a brake; the motor is used to provide power for the hydraulic system, and the first reversing valve, the second reversing valve and the throttle valve realize normal braking and emergency braking of the brake.

[0005] When the first reversing valve and the motor lose power and the second reversing valve remains powered, the hydraulic system loses pressure, and the throttle valve reduces the pressure oil of the brake to the second low pressure working interval, and the second reversing valve loses power after a preset time, so that the brake is closed to realize normal braking.

[0006] When the first reversing valve, the second reversing valve and the motor lose power, the hydraulic system loses pressure, and the throttle valve reduces the pressure oil of the brake to the third low pressure working interval, and the brake is closed to realize emergency braking.

[0007] Preferably, the throttle valve is used to adjust the hydraulic oil of the brake to realize the adjustment of the braking pressure of the second low pressure working interval or the third low pressure working interval.

[0008] Preferably, the two-stage pressure brake can also realize the release of the brake.

[0009] Preferably, the two-stage pressure brake further comprises a pressure sensor for detecting the pressure of the hydraulic oil, and when the pressure detected by the pressure sensor rises to a first pressure threshold, the motor loses power, and the first reversing valve and the second reversing valve are powered.

[0010] Preferably, when the pressure value measured by the pressure sensor is lower than a second pressure threshold, the motor is controlled to start to complete pressure compensation until the pressure value is greater than the first pressure threshold, and the second pressure threshold is lower than the first pressure threshold.

[0011] Preferably, the two-stage hydraulic brake further comprises a manual pump and a stop valve, the manual pump is used to increase the pressure of the hydraulic oil to open the brake, and the stop valve is used to reset the manual pump after the manual pump completes the opening of the brake.

[0012] Preferably, the two-stage hydraulic brake further comprises a hydraulic oil temperature sensor, the hydraulic oil temperature sensor is used to detect the hydraulic temperature, and when the hydraulic temperature is higher than a set temperature threshold, the two-stage hydraulic brake is controlled to stop for inspection.

[0013] The application also provides a two-stage hydraulic brake method of the two-stage hydraulic brake, comprising the following steps:

[0014] When the first reversing valve and the motor lose power and the second reversing valve remains in the powered state, the hydraulic system loses pressure, the throttle valve causes the pressure oil of the brake to drop to the second-stage low-pressure working interval, the second reversing valve loses power after a preset time, the brake is closed to achieve normal braking, and the second reversing valve loses power within a preset time, the hydraulic system loses pressure, the throttle valve causes the pressure oil of the brake to drop to the third-stage low-pressure working interval, and the brake is closed to achieve emergency braking.

[0015] Preferably, the two-stage hydraulic brake method further comprises the following step: when the detected pressure of the hydraulic oil rises to a first pressure threshold, the motor is controlled to lose power, and the first reversing valve and the second reversing valve are controlled to be powered.

[0016] Preferably, the two-stage hydraulic brake method further comprises the following step: when the pressure value measured by the pressure sensor is lower than a second pressure threshold, the motor is controlled to start to complete pressure compensation until the pressure value is greater than the first pressure threshold, and the second pressure threshold is lower than the first pressure threshold.

[0017] The application has the beneficial effects that the opening and closing of the first reversing valve, the second reversing valve and the throttle valve can achieve normal braking and emergency braking of the brake, and the braking time and braking torque can be adjusted according to different loads. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a schematic diagram of the two-stage hydraulic brake. DETAILED DESCRIPTION

[0019] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0020] Embodiment 1

[0021] Please refer to the drawings Figure 1 , provide a two-stage hydraulic brake, including motor 1, the first reversing valve Y01, the second reversing valve Y02, the hydraulic system 16, throttle valve (8.1 and 8.2) and brake SF15; the motor 1 is used for providing power for the hydraulic system 16, the first reversing valve Y01, the second reversing valve Y02, the throttle valve (8.1 and 8.2) realize the normal brake and emergency brake of brake SF15;Wherein, the motor 1 can be a three-phase motor, through the driving gear pump 2 in the hydraulic system 16 to provide power for the hydraulic system 16, as a preferred embodiment, the gear pump 2 before still being provided with oil suction filter 3 for preventing the gear pump from sucking large particles of impurities. Wherein, the gear pump 2 can convert electrical energy into hydraulic energy.

[0022] Wherein, the normal brake is realized by the following way: when the first reversing valve Y01 and the motor 1 lose power, the second reversing valve Y02 keeps the power on, then the hydraulic system 16 loses pressure, the throttle valve 8.2 makes the pressure oil of the brake SF15 drop to the second stage low pressure working interval, the second reversing valve Y02 loses power after a preset time, so that the brake SF15 is closed to realize normal braking;Wherein, the second stage low pressure working interval is about 100 bar.

[0023] When the first reversing valve Y01, the second reversing valve Y02 and the motor 1 lose power, the hydraulic system 16 loses pressure, the throttle valve 8.1 makes the pressure oil of the brake SF15 drop to the third stage low pressure working interval, and the brake is closed to realize emergency braking. Wherein the third stage low pressure working interval is about 60 bar.

[0024] Wherein, the throttle valve 8.1, the throttle valve 8.2 are used for adjusting the hydraulic oil of the brake SF15 to realize the brake pressure adjustment of the second stage low pressure working interval or the third stage low pressure working interval. The time that the pressure oil is kept in the second stage and the third stage low pressure working interval can be set by the throttle valve 8.1, the throttle valve 8.2, clockwise into, time lengthens, counterclockwise rotates out, time becomes short. The first reversing valve Y01, the second reversing valve Y02 are electromagnetic reversing valves, used for on-off oil, which can be controlled by electrical signal; the throttle valve 8.1, the throttle valve 8.2 are used for adjusting the oil flow.

[0025] As a preferred embodiment, the two-stage hydraulic brake in this embodiment can also have a release function. When the motor 1 is powered on, the solenoid valves Y01 and Y02 are powered on, hydraulic oil enters the brake SF15 from the hydraulic station, and the pressure begins to rise (which can be observed from the pressure gauge 11). When the pressure rises to more than 200 bar as fed back by the pressure sensor PS01, the motor M01 is powered off, and the solenoid valves Y01 and Y02 remain powered on. At this time, the brake is in a fully released state, and the brake SF15 release limit action sends a signal. At this time, the pressure sensor PS02 also has a corresponding pressure feedback. During the process of keeping the brake SF15 in a released state, the pressure gradually decreases due to internal leakage of the hydraulic system. When the pressure decreases to less than 180 bar as fed back by the pressure sensor PS01, the motor M01 is started again to complete pressure compensation until the PS01 feedback value is greater than 200 bar.

[0026] As a preferred embodiment, the two-stage hydraulic brake in this embodiment also has a manual release function. The manual pump 12 is arranged between the hydraulic system 16 and the brake SF15, which facilitates use in emergencies or when there is no power.

[0027] As a preferred embodiment, the hydraulic system 16 further includes a liquid level and temperature gauge 13 for monitoring the position and temperature of the oil, and optionally, an electrical signal is sent when a specified temperature or liquid level is reached.

[0028] As a preferred embodiment, the hydraulic system 16 further includes a temperature sensor 21 for monitoring the temperature of the oil, and optionally, an electrical signal is sent when a specified temperature value is exceeded.

[0029] As a preferred embodiment, the hydraulic system 16 further includes a heater 20 for heating the oil when the oil temperature in the hydraulic system is below a specified threshold.

[0030] As a preferred embodiment, the hydraulic system 16 further includes an air filter 15 for filtering impurities in the air.

[0031] As a preferred embodiment, the hydraulic system 16 further includes a liquid level gauge 14 for visually observing the liquid level of the oil.

[0032] As a preferred embodiment, the hydraulic system 16 further includes a drain for use when the oil is drained.

[0033] As a preferred embodiment, the two-stage hydraulic brake in this embodiment also has a pressure sensor S01 connected to the hydraulic system 16 through a one-way ball valve 6.1 and a filter 5. When the pressure detected by the pressure sensor S01 rises to a first pressure threshold (such as 200 bar), the motor 1 is de-energized, and the first directional valve Y01 and the second directional valve Y02 are energized. The filter 5 is used to filter impurities in the oil.

[0034] As a preferred embodiment, the two-stage hydraulic brake in this embodiment also has overflow valves (4.1 / 4.2 / 4.3 / 4.4) to protect components. The overflow valve 4.1 is unloaded when the pressure exceeds 200 bar, the overflow valve 4.2 is unloaded when the pressure exceeds 180 bar, the overflow valve 4.3 is unloaded when the pressure exceeds 100 bar, and the overflow valve 4.4 is unloaded when the pressure exceeds 60 bar, to avoid damaging the corresponding components.

[0035] As a preferred embodiment, the two-stage hydraulic brake in this embodiment also includes a manual on-off ball valve 7.1 for oil, which is arranged in parallel with the first directional valve Y01 and the second directional valve Y02 on the oil circuit.

[0036] As a preferred embodiment, the two-stage hydraulic brake in this embodiment also includes an accumulator 18 for storing hydraulic energy, which is used to provide hydraulic energy to the system when the system pressure is insufficient, reducing the number of motor starts.

[0037] Embodiment 2

[0038] This embodiment provides a braking method based on the two-stage hydraulic brake in Embodiment 1, which includes the implementation of normal braking and emergency braking, including the following steps: when the first directional valve Y01 and the motor are de-energized, and the second directional valve remains energized, the hydraulic system loses pressure, the throttle valve reduces the pressure oil of the brake to the second-stage low-pressure working interval, and the second directional valve is de-energized after a preset time, causing the brake to close and implement normal braking; controlling the second directional valve to be de-energized within a preset time causes the hydraulic system to lose pressure, the throttle valve reduces the pressure oil of the brake to the third-stage low-pressure working interval, and the brake closes to implement emergency braking.

[0039] The brake can implement multiple functions, including release of the brake, normal braking closure of the brake, emergency braking closure of the brake, manual release of the brake, and fault protection of the brake.

[0040] The release of the brake includes the following steps:

[0041] 1.1, the motor 1 is powered on, and the first reversing valve Y01 and the second reversing valve Y02 are powered on, hydraulic oil enters the brake from the hydraulic station, and the pressure starts to rise (which can be observed from the pressure gauge).

[0042] 1.2, when the pressure rises to above 200bar of the pressure sensor PS01 feedback pressure, the motor 1 is powered off, and the first reversing valve Y01 and the second reversing valve Y02 remain powered on.

[0043] 1.3, at this time, the brake is in a fully released state, and the corresponding brake release limit action sends a signal, and at this time, the pressure sensor PS02 also has a corresponding pressure feedback.

[0044] 1.4, during the process of keeping the brake in a released state, the pressure gradually decreases due to leakage in the hydraulic system, and when the pressure decreases to below 180bar of the pressure sensor PS01 feedback value, the motor M01 is started again to complete pressure compensation until the PS01 feedback value is greater than 200bar.

[0045] Among them, the closing working process of the brake in normal braking is as follows:

[0046] 2.1, the first reversing valve Y01 is powered off, the motor 1 is powered off, and the first reversing valve Y02 remains powered on, at this time, the hydraulic system 16 is de-energized, and because of the setting of the throttle valve 8, the pressure oil of the brake first decreases to the second low pressure working interval (about 100bar), and then slowly returns to the hydraulic station;

[0047] 2.2, after the first reversing valve Y01 is powered off, a time delay of, for example, 10 seconds, the second reversing valve Y02 is powered off.

[0048] 2.3, at this time, the brake is closed, and the corresponding brake release limit action.

[0049] Among them, the closing working process of the brake in emergency braking is as follows:

[0050] 3.1, the first reversing valve Y01 and the second reversing valve Y02 are powered off at the same time, and the motor is powered off, at this time, the hydraulic system is de-energized, and because of the setting of the throttle valve, the pressure oil of the brake directly decreases to the third low pressure working interval (about 60bar), and then slowly returns to the hydraulic station, and the brake will be more violent than the normal brake closing.

[0051] 3.2, at this time, the brake is closed, and the corresponding brake release limit action.

[0052] As a preferred embodiment, the time for which the pressure oil remains in the second and third low pressure working intervals can be set by the throttle valve 8 according to the site conditions, and the time is lengthened by rotating clockwise and shortened by rotating counterclockwise.

[0053] Wherein, the manual release working process of the brake is as follows:

[0054] 4.1, in the emergency state (hydraulic station power failure, etc.), can be through the operation of the hand pump and stop valve (in this embodiment, the plate type ball valve), open the brake.

[0055] 4.2, pull the stop valve handle 90 degrees, close the stop valve.

[0056] 4.3, the hand pump operating rod is inserted into the hand pump, and the hand pump is continuously pressed up and down, and the pressure starts to rise.

[0057] 4.4, from the pressure gauge observation, when the pressure reaches the brake opening pressure (such as 180bar), the brake has been in the open state. It should be noted that: after the manual operation is completely finished, the stop valve needs to be reset.

[0058] Wherein the brake fault protection is realized by the following ways:

[0059] 5.1, the protection time of the motor is 1 minute, if the motor is powered and pressed for 1 minute without stopping (PS01 does not reach 200bar), it needs to be stopped for inspection;

[0060] 5.2, if the feedback value of the hydraulic oil temperature sensor is greater than 70℃, it means that the hydraulic oil temperature is too high, and it needs to be stopped for inspection;

[0061] 5.3, if the hydraulic oil level switch S01 is disconnected, output "0" signal, it means that the hydraulic oil level is too low, and it needs to be stopped for inspection;

[0062] Although the embodiments of the present application have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A two-stage hydraulic brake, characterized by, The two-stage hydraulic brake comprises a motor, a first reversing valve, a second reversing valve, a hydraulic system, a throttle valve and a brake; the motor is used to provide power for the hydraulic system, the first reversing valve, the second reversing valve and the throttle valve realize normal braking and emergency braking of the brake; when the first reversing valve and the motor lose power and the second reversing valve remains in the powered state, the hydraulic system loses pressure, the throttle valve reduces the pressure oil of the brake to the second low pressure working interval, and the second reversing valve loses power after a preset time to make the brake close to realize normal braking; when the first reversing valve, the second reversing valve and the motor lose power, the hydraulic system loses pressure, and the throttle valve reduces the pressure oil of the brake to the third low pressure working interval, and the brake closes to realize emergency braking. The two-stage hydraulic brake further comprises a pressure sensor for detecting the pressure of the hydraulic oil; when the pressure detected by the pressure sensor rises to a first pressure threshold, the motor is controlled to lose power, and the first reversing valve and the second reversing valve are controlled to be powered; when the pressure value measured by the pressure sensor is lower than a second pressure threshold, the motor is controlled to start to complete pressure compensation until the pressure value is greater than the first pressure threshold, and the second pressure threshold is less than the first pressure threshold; the two-stage hydraulic brake further comprises a manual pump and a stop valve, the manual pump is used to increase the pressure of the hydraulic oil of the brake to open the brake, and the stop valve is used to reset the manual pump after the manual pump completes the opening of the brake. The two-stage hydraulic brake further comprises a hydraulic oil temperature sensor for detecting the hydraulic temperature; when the hydraulic temperature is higher than a set temperature threshold, the two-stage hydraulic brake is controlled to stop to be checked.

2. The two-stage hydraulic brake of claim 1, wherein, The throttle valve is used to adjust the hydraulic oil of the brake to realize the adjustment of the braking pressure of the second low pressure working interval or the third low pressure working interval.

3. The two-stage hydraulic brake of claim 1, wherein, The two-stage pressure brake can also realize the release of the brake.

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