AU2019304006A1 - Pressure-limiting assembly for use in hydraulic or pneumatic brake systems - Google Patents

Pressure-limiting assembly for use in hydraulic or pneumatic brake systems Download PDF

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Publication number
AU2019304006A1
AU2019304006A1 AU2019304006A AU2019304006A AU2019304006A1 AU 2019304006 A1 AU2019304006 A1 AU 2019304006A1 AU 2019304006 A AU2019304006 A AU 2019304006A AU 2019304006 A AU2019304006 A AU 2019304006A AU 2019304006 A1 AU2019304006 A1 AU 2019304006A1
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AU
Australia
Prior art keywords
pressure
valve
holding
limiting assembly
brake
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
AU2019304006A
Inventor
Sergej AUGUST
Sergei STÄRKLOW
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemag Tecberg GmbH
Original Assignee
Siemag Tecberg GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemag Tecberg GmbH filed Critical Siemag Tecberg GmbH
Publication of AU2019304006A1 publication Critical patent/AU2019304006A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G13/00—Roller-ways
    • B65G13/075—Braking means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G23/00—Driving gear for endless conveyors; Belt- or chain-tensioning arrangements
    • B65G23/24—Gearing between driving motor and belt- or chain-engaging elements
    • B65G23/26—Applications of clutches or brakes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D66/00—Arrangements for monitoring working conditions, e.g. wear, temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/02—Fluid pressure

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transportation (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Braking Systems And Boosters (AREA)

Abstract

Pressure-limiting assembly for use in a hydraulically or pneumatically operated mechanical brake system which is supplied with pressure for releasing the brake by a pump (1) and is discharged to a tank (2), wherein the pressure-limiting assembly consists of at least one normally open switching valve (60.1, 60.2) and also at least one pressure-maintaining arrangement, which is provided between the switching valve (60.1, 60.2) and the tank (2) and can be adjusted to a defined brake pressure, for rapidly reducing the system pressure to a preset pressure level and then staying at the level for a predetermined period.

Description

Description Title: Pressure limiting assembly for use in hydraulic or pneumatic braking sys tems
[0001] The present invention relates to a pressure limiting assembly for use in hydraulic or pneumatic braking systems of shaft conveyor systems, as described by the generic part of independent claim 1.
[0002] In modem shaft conveyor systems, which sometimes reach depths of more than a thousand meters, the correct and reliable function of the brakes of the shaft conveyor system plays a decisive and central role in every situation.
[0003] With the ever-increasing complexity of electronic components in braking systems, the possibility of malfunctions is also increasing. If a safety-relevant component is affected by such a malfunction, people can be harmed in the worst case. If, for example, a control unit of a hydraulic or pneumatic braking system in the conveyor operation of the shaft con veyor system were to unexpectedly trigger a full braking, this could lead to significant dam age to the material, as well as to injuries to humans, animals or environmental damage.
[0004] In order to minimize the risk of dangerous malfunctions of safety-relevant electri cal, electronic or programmable electronic (E/E/PE) systems, these should be developed in the light of relevant standards.
[0005] Functional safety describes that part of the safety of a system, such as the braking system of a shaft conveyor system, which depends on the correct functioning of the safety related system and other risk-reducing measures. So the focus is on the function, hence the term "functional safety". It must be demonstrated that the E/E/PE systems, in this case the brake control system, provide the required functionality safely and reliably despite increas ing complexity.
[0006] Due to the increasingly important functional safety requirements for machines and systems worldwide, especially for shaft conveyors, it is necessary to maintain technical solutions that fill gaps in the standard assessments carried out by the manufacturers of the individual components for the existing functional safety and allow a reliable assessment of the probability of failure and thus avoid dangerous braking.
[0007] Well-known types of valves in hydraulic or pneumatic braking systems are me chanically adjustable pressure limiting valves, proportionally adjustable pressure limiting valves or proportionally adjustable pressure limiting valves with motor adjustment.
[0008] These valves have different drawbacks. Mechanical pressure limiting valves cannot be adjusted as required during operation. Proportional pressure limiting valves drop when the power supply is switched off to either the minimum or maximum pressure setting, which in both cases can lead to catastrophic consequences for the conveyor system or the people in it. Proportional pressure limiting valves with motor adjustment finally have insuf ficient values for the probability of failure (MTTFd according to ISO 13849).
[0009] The evaluations of market-standard components, in particular of proportionally adjustable valves, i.e. continuously adjustable valves that limit the output pressure depending on electrical current, are generally based only on the respective final values, i.e. the mini mum value or maximum value, which represent the condition after switching off the power supply, but not the intermediate control range, which is of major relevance for a controlled deceleration of a conveyor system for example in the event of a power failure.
[0010] Another disadvantage of previously known systems with permanently adjusta ble pressure valves is the need to use several valves with different preset pressure values for each pressure level to be set, which are always preselected to the required value by a control.
[0011] The object of the present invention is therefore to provide a pressure limiting assembly for use in braking systems, in particular those which are used in shaft conveyors, dissection systems, emergency or auxiliary driving systems, which can quickly reduce the system pressure in the braking system in the event of a fault or, in the event of a power failure, to a pre-set pressure level, i.e. the braking pressure, and then to keep it at the achieved level for a predetermined duration, i.e. the braking time, in order to prevent, for example a catastrophic full braking or even a crash of the conveyance.
[0012] This problem is solved by the features of the independent claim 1, while func tional embodiments are described by the features of the subclaims.
[0013] Provided is a pressure limiting assembly for use in machine braking systems, which is designed in such a way that it quickly reduces the system pressure to a pre-set pressure level, i.e. the braking pressure, and then keeps it at that level for a predetermined duration, in particular the braking time, wherein the pressure limiting module is character ized by the fact that its pressure level is proportionally adjustable during operation and when switching off the control voltage the proportionally preset pressure in the system is main tained by the pressure limiting module for a defined braking time, even in the event of switching off or power failure of the valve..
[0014] In a preferred embodiment the pressure limiting assembly has a control system, for deliberate adjustment of the proportional adjustment of the pressure/brake pressure by means of the valves according to the current operating situation.
[0015] The subfunction pressure reduction as well as the subfunction pressure holding of the pressure limiting assembly is preferably a multichannel configuration, to achieve a high safety level.
[0016] A pressure limiting assembly according to the invention makes it possible that the individual failure rates of the components of the pressure limiting assembly, but also failure rates for the system, can be determined according to the state of the art.
[0017] The application can be hydraulically or pneumatically.
[0018] The application can be carried out in a braking system for friction conveyors, but also in a brake system for drum conveyors.
[0019] The storage of the pressure in the system can be carried out by an energy storage device (pneumatic, mechanical or other energy storage methods).
[0020] In concrete terms, according to the invention, a pressure limiting assembly is provided for use in hydraulically or pneumatically operated machine braking systems, which is supplied by a pump with pressure to release the brake and is relieved for braking towards a tank, wherein the pressure limiting assembly consists of at least one switch valve opened in a currentless state and at least one pressure holding arrangement located between the switching valve and the tank, adjustable to a defined braking pressure, for the rapid reduction of the system pressures to a preset pressure level and then it holding at the level for a predetermined duration.
[0021] Ina preferred embodiment, the at least one pressure holding arrangement consists of a proportionally adjustable valve pressure-applied by means of a pump, which is closed in a currentless state, and a pressure holding valve, whose pressure holding level is controlled by the proportionally adjustable valve. Furthermore, the pressure holding arrangement may be provided with a pressure accumulator arranged between the pressure holding valve and the proportionally adjustable valve, for compensating for leaks, as well as a pressure sensor for controlling the adjustable valve.
[0022] The pressure limiting assembly may also be designed in such a way that a plu rality of pressure holding arrangements, preferably four, are provided, which are also pref erably controlled by a plurality, preferably two, of switch valves opened in a currentless state.
[0023] Further properties and features of the invention can be taken from the following, non-restrictive, description of a partial control scheme of a pressure limiting assembly of a brake according to the invention.
[0024] Fig. 1 shows a, preferably hydraulic, brake with a brake disc 12 and four brake pistons 11, which as shown are pressed against the brake disc 12 in the normal state by springs lla. To release the brake, the cylinders 1b are pneumatically or hydraulically pres surized, so that the brake pistons are lifted off. If the pressure supply fails, the system brakes automatically.
[0025] The valves pos. 50.1 to 53.1 and 50.3 to 53.3 (channel 1) as well as the valves pos. 50.2 to 53.2 and 50.4 to 53.4 (channel 2) form the function of pressure reduction.
[0026] The valves pos. 50.1 to 53.1 and 50.2 to 53.2 (channel 1) as well as the valves pos. 50.3 to 53.3 and 50.4 to 53.4 (channel 2) form the function of holding pressure.
[0027] The proportional pressure adjustment is carried out by valves 53.1 to 53.4.
[0028] This sets a defined pressure between valves 53.1 to 53.4 and 50.1 to 50.4, as well as in the accumulators 51.1 to 51.4 and in case of voltage loss at the control valve 53.1 to 53.4 or further shut-off valves (not shown).
[0029] The accumulators 51.1 to 51.4 are used to compensate for leaks and allow the control movement of valves pos. 50.1 to 50.4.
[0030] The set pressure is determined and monitored by the pressure sensors 52.1 to 52.4, which serve to control the control valves 53.1 to 53.4.
[0031] During operation, the system is supplied with pressure by pump 1 and relieved to wards tank 2. A check valve unit 3 prevents pressure reduction in the direction of the
pump.
[0032] The switching valves 60.1 and 60.2 activate the pressure reduction circuit with subsequent pressure retention.
[0033] The switching valves pos. 60.1 and 60.2 are controlled during normal operation and block the way to the pressure limiting modules 50 to 53. The pump 1 builds up pres sure and ventilates the brake elements 11 so that the brake disc 12 can rotate.
[0034] The pressure of the pressure limiting assembly is continuously and operationally controlled via valves 50.X to 53.X. If emergency braking is requested or power fails, the switching valves 60.1 and 60.2 are switched voltage free and thus opened. At the same time, the valves 53.X are switched voltage free and thus closed, so that the set pressure is kept in the pressure limiting assembly.

Claims (1)

Claims
1. Pressure limitation assembly for use in a hydraulically or pneumatically operated, mechanical braking system, which is supplied with pressure by a pump (1) to release the brake and relieved towards a tank (2), characterized in that the pressure limiting assembly consists of at least one switch valve opened in a currentless state (60.1, 60.2) and at least one pressure holding arrangement located between switching valve (60.1, 60.2) and tank (2), adjustable to a defined brake pressure, for the rapid reduc tion of the system pressures to a preset pressure level and then holding it at the level for a predetermined duration.
2. Pressure limiting assembly according to claim 1, characterized in that the at least one pressure holding arrangement consists of a proportionally adjustable valve (53.1, 53.2, 53.3, 53.4), pressure-applied by the pump (1), as well as a pressure-holding valve (50.1, 50.2, 50.3, 50.4), whose pressure holding level is controlled by the pro portionally adjustable valve (53.1, 53.2, 53.3, 53.4).
3. Pressure limiting assembly according to claim 2, characterized in that the pressure holding arrangement is provided with a valve located between the pressure holding valve (50.1, 50.2, 50.3, 50.4) and the proportionally adjustable valve (53.1, 53.2, 53.3, 53.4) as well as a pressure sensor (52.1, 52.2, 52.3, 52.4) to control the adjust able valve (53.1, 53.2, 53.3, 53.4).
4. Pressure limiting assembly according to one of the preceding claims, characterized in that a plurality of pressure holding arrangements are provided.
5. Pressure limiting assembly according to one of the preceding claims, characterized in that a plurality of switch valves opened in a currentless state (60.1, 60.2) are pro vided.
6. Method for pressure limitation in a hydraulically or pneumatically operated machine braking system, which is supplied by a pump (1) with pressure to release the brake and relieved to a tank (2) for braking, so that if the pressure supply fails, the system brakes automatically, comprising the steps of: a. Providing a pressure limiting assembly consisting of at least one switching valve opened in a powerless state (60.1, 60.2) and at least one pressure hold ing arrangement located between the switching valve (60.1, 60.2) and the tank (2), adjustable to a defined braking pressure, with a proportionally ad justable valve (53.1, 53.2, 53.3, 53.4) pressure-applied by the pump (1), and a pressure-holding valve (50.1, 50.2, 50.3, 50.4), the pressure-holding level of which is controlled by the proportionally adjustable valve (53.1, 53.2, 53.3, 53.4); b. Controlling the switching valves (60.1, 60.2) in normal operation to block the path to the at least one pressure limiting arrangement (50 to 53), c. Pressure build-up by the pump (1) and ventilating the brake elements (11) to release the brake (11, 12); d. Continuous, operational control of the pressure in at least one pressure limit ing assembly via the proportionally adjustable valve (53.1, 53.2, 53.3, 53.4); e. In the event of emergency braking or power failure, voltage switch off and subsequent opening of the switching valves (60.1; 60.2) with simultaneous voltage-free switching and the resulting closing of the proportionally adjust able valve (53.1, 53.2, 53.3, 53.4), so that the set pressure is maintained in the pressure limiting assembly by means of the pressure holding valve (50.1, 50.2, 50.3, 50.4).
7. Method for pressure limitation in a hydraulically or pneumatically operated machine braking systems according to claim 6, wherein between the proportionally adjustable valve (53.1, 53.2, 53.3, 53.4) and the pressure-holding valve (50.1, 50.2, 50.3, 50.4) accumulators (51.1, 51.2, 51.3, 51.4) are provided to compensate for leaks that allow the control movement of the pressure holding valve (50.1, 50.2, 50.3, 50.4).
8. Method for pressure limitation in a hydraulically or pneumatically operated machine braking systems according to claim 6 or 7, wherein the set pressure in the pressure holding arrangement is determined and monitored by a pressure sensor (52.1, 52.2,
52.3, 52.4), wherein the determined pressure forms the basis for the control of the proportionally adjustable valve (53.1, 53.2, 53.3, 53.4).
1 /1
Fig. 1
AU2019304006A 2018-07-18 2019-07-17 Pressure-limiting assembly for use in hydraulic or pneumatic brake systems Abandoned AU2019304006A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102018117403.9A DE102018117403A1 (en) 2018-07-18 2018-07-18 Pressure limiting assembly for use in brake systems
DE102018117403.9 2018-07-18
PCT/EP2019/069228 WO2020016289A1 (en) 2018-07-18 2019-07-17 Pressure-limiting assembly for use in hydraulic or pneumatic brake systems

Publications (1)

Publication Number Publication Date
AU2019304006A1 true AU2019304006A1 (en) 2021-01-14

Family

ID=67439194

Family Applications (1)

Application Number Title Priority Date Filing Date
AU2019304006A Abandoned AU2019304006A1 (en) 2018-07-18 2019-07-17 Pressure-limiting assembly for use in hydraulic or pneumatic brake systems

Country Status (9)

Country Link
EP (1) EP3793873B1 (en)
KR (1) KR20210031896A (en)
CN (1) CN112424039A (en)
AU (1) AU2019304006A1 (en)
DE (1) DE102018117403A1 (en)
PL (1) PL3793873T3 (en)
RS (1) RS63592B1 (en)
WO (1) WO2020016289A1 (en)
ZA (1) ZA202007743B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102021111505A1 (en) 2021-05-04 2022-11-10 Olko-Maschinentechnik Gmbh Winding machine with a braking device
LU102951B1 (en) * 2022-05-10 2023-11-10 Siemag Tecberg Gmbh Braking system for use in conveyor machines for shaft and inclined conveyor systems

Family Cites Families (11)

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Publication number Priority date Publication date Assignee Title
DD143704A3 (en) * 1978-08-23 1980-09-10 Dieter Boehm CONTROL DEVICE OF A HYDRAULICALLY WORKED DISC BRAKE, ESPECIALLY FOR BAY FILLING MACHINES
DE3204695A1 (en) * 1982-02-11 1983-08-18 Siemens AG, 1000 Berlin und 8000 München Device for the safety braking of hoists, in particular drum-type hoists
US20050001481A1 (en) * 2001-05-09 2005-01-06 Ronald Kley Method for holding a vehicle on an incline and starting traction control for holding a vehicle on an incline
DE102004057739A1 (en) * 2004-10-08 2006-04-13 Bosch Rexroth Ag Brake unit for braking of rotor of wind power plant has block valve designed as directional seating valve installed in pressure medium path between tank connection of directional valve and pressure medium sink
DE102007037967A1 (en) * 2007-08-11 2009-02-12 Linde Material Handling Gmbh Utility vehicle e.g. battery-electrical fork-lift truck, has brake valve actuated from reduction position into supplying position and from supplying position into reduction position, by electric impulse
DE102007041411B3 (en) * 2007-08-31 2009-01-29 Siemag M-Tec2 Gmbh Hydraulic deceleration-controlled disc brake unit for e.g. hoist in mining, has directional valve arranged in connecting line, and programmable logic controllers controlling control valves lying diagonal to each other in hydraulic lines
DE102009031743B4 (en) * 2008-07-29 2022-01-20 Linde Material Handling Gmbh Mobile work machine with a brake with two pressure chambers
CN102514562B (en) * 2011-12-03 2014-12-10 中国煤炭科工集团太原研究院 Double-tube fully-hydraulic braking device with closed wet-type multi-disc brakes for coal mine explosion-proof vehicle
KR101350842B1 (en) * 2012-03-08 2014-01-16 주식회사 만도 Electronic control brake system for automobile
CN104228809B (en) * 2014-09-18 2015-09-09 吉林大学 Be applied to exhaust gear and the control method of hydraulic braking system for automobile
CN106042978B (en) * 2016-07-11 2017-09-05 吉林大学 A kind of self-adaption cruise system and control method

Also Published As

Publication number Publication date
PL3793873T3 (en) 2023-01-02
EP3793873B1 (en) 2022-08-10
RS63592B1 (en) 2022-10-31
DE102018117403A1 (en) 2020-01-23
EP3793873A1 (en) 2021-03-24
KR20210031896A (en) 2021-03-23
WO2020016289A1 (en) 2020-01-23
CN112424039A (en) 2021-02-26
ZA202007743B (en) 2023-02-22

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MK1 Application lapsed section 142(2)(a) - no request for examination in relevant period