阅读说明：本技术 一种用于盘式制动器的数字液压和电磁复合制动系统 (Digital hydraulic and electromagnetic composite braking system for disc brake ) 是由 张军辉 杨梅生 尹作振 周生刚 孙晋明 于 2021-07-07 设计创作，主要内容包括：本发明公开了一种用于盘式制动器的数字液压和电磁复合制动系统,包括动力源单元、系统压力控制阀组、高压控制阀组、低压控制阀组、制动油缸组、电磁制动器组和集中电控部分。本发明可以控制系统压力控制阀组动作对系统压力进行控制调节以保护系统安全,可以控制高压控制阀组或低压控制阀组动作实现松闸或制动；当制动系统所需制动的是重载荷时,可以实现液压制动和电磁制动两套制动装置进行联合制动；当系统所需制动负载是轻载荷、且需紧急制动时,可以控制电磁制动器进行制动,不仅可以实现紧急制动,而且可避免电机和液压泵的频繁启停,能够满足对制动油缸的制动压力的快速响应和精确控制要求,特别适用于矿山带式输送装备的制动系统。(The invention discloses a digital hydraulic and electromagnetic composite braking system for a disc brake, which comprises a power source unit, a system pressure control valve group, a high-pressure control valve group, a low-pressure control valve group, a braking oil cylinder group, an electromagnetic brake group and a centralized electric control part. The invention can control the action of the system pressure control valve group to control and regulate the system pressure so as to protect the system safety, and can control the action of the high-pressure control valve group or the low-pressure control valve group to realize brake release or braking; when the heavy load is required to be braked by the brake system, the combined braking of two sets of brake devices, namely hydraulic brake and electromagnetic brake, can be realized; when the braking load required by the system is light load and needs emergency braking, the electromagnetic brake can be controlled to brake, so that emergency braking can be realized, frequent starting and stopping of the motor and the hydraulic pump can be avoided, the requirements on quick response and accurate control of the braking pressure of the braking oil cylinder can be met, and the braking system is particularly suitable for the braking system of mine belt type conveying equipment.)

1. A digital hydraulic and electromagnetic composite braking system for a disc brake is characterized by comprising a power source unit, a system pressure control valve group, a high-pressure control valve group, a low-pressure control valve group, a braking oil cylinder group, an electromagnetic brake group and a centralized electric control part;

the power source unit comprises an oil tank (1), a motor (3), a hydraulic pump (4) and a one-way valve (6), wherein the input end of the hydraulic pump (4) in transmission connection with the motor (3) is connected with the oil tank (1), and the output end of the hydraulic pump (4) is connected with the input end of the one-way valve (6);

the system pressure control valve group comprises a plurality of miniature high-speed digital valves I, the input ends and the output ends of the miniature high-speed digital valves I are respectively communicated and arranged to form a parallel connection structure, the input end of the system pressure control valve group is connected with the output end of a one-way valve (6), the output end of the system pressure control valve group is connected with an oil tank (1), and a first pressure sensor (14) for detecting the system pressure is connected with the output end of the one-way valve (6);

the high-pressure control valve group comprises a plurality of miniature high-speed digital valves II, the input ends and the output ends of the miniature high-speed digital valves II are respectively communicated and arranged to form a parallel connection structure, the input end of the high-pressure control valve group is connected with the output end of the check valve (6), and a second pressure sensor (18) for detecting the output pressure of the high-pressure control valve group is connected with the output end of the high-pressure control valve group;

the low-pressure control valve group comprises a plurality of micro high-speed digital valves III, the input ends and the output ends of the micro high-speed digital valves III are respectively communicated and arranged to form a parallel connection structure, the input end of the low-pressure control valve group is connected with the output end of the high-pressure control valve group, and the output end of the low-pressure control valve group is connected with the oil tank (1);

the brake oil cylinder group comprises a brake oil cylinder arranged corresponding to the end face of the brake disc (23), the brake oil cylinder is of a normally closed structure provided with a return spring, the telescopic end of the brake oil cylinder abuts against the end face of the brake disc (23) through a friction element, and the brake oil cylinder is connected with the output end of the high-pressure control valve group;

the electromagnetic brake group comprises an electromagnetic brake arranged corresponding to the end surface of the brake disc (23);

the centralized electric control part comprises a controller and a brake control loop, wherein the controller is respectively electrically connected with the motor (3), the miniature high-speed digital valve I, the first pressure sensor (14), the miniature high-speed digital valve II, the second pressure sensor (18), the miniature high-speed digital valve III and the electromagnetic brake.

2. The digital hydraulic and electromagnetic composite brake system for a disc brake according to claim 1, characterized in that the digital hydraulic and electromagnetic composite brake system for a disc brake further comprises an accumulator (10), the accumulator (10) being connected to the output of the non-return valve (6).

3. The digital hydraulic and electromagnetic compound brake system for a disc brake of claim 1, wherein the return spring of the brake cylinder is disposed in a rodless chamber, and the rod chamber of the brake cylinder is connected to the output end of the high pressure control valve bank.

4. The digital hydraulic and electromagnetic composite brake system for the disc brake as claimed in claim 3, wherein the brake cylinders comprise a first brake cylinder (19) and a second brake cylinder (20), the first brake cylinder (19) and the second brake cylinder (20) are arranged on two sides of the end surface of the brake disc (23) in a left-right opposite manner, the telescopic ends of the first brake cylinder (19) and the second brake cylinder (20) respectively abut against the end surface of the brake disc (23) through friction elements, and the first brake cylinder (19) and the second brake cylinder (20) are respectively connected with the output end of the high-pressure control valve bank.

5. The digital hydraulic and electromagnetic compound brake system for a disc brake according to claim 1, characterized in that the electromagnetic brake includes a first electromagnetic brake (21) and a second electromagnetic brake (22), and the first electromagnetic brake (21) and the second electromagnetic brake (22) are disposed on both sides of an end surface of the brake disc (23) in a left-right opposed manner.

6. The digital hydraulic and electromagnetic compound brake system for a disc brake of claim 1, wherein the power source unit further includes a filter.

7. Digital hydraulic and electromagnetic composite braking system for disc brakes according to claim 6, characterized in that the filter comprises a coarse filter (2) and a fine filter (5), the input of the hydraulic pump (4) being connected to the tank (1) through the coarse filter (2), the output of the hydraulic pump (4) being connected to the input of the non-return valve (6) through the fine filter (5).

8. The digital hydraulic and electromagnetic compound brake system for a disc brake as defined in claim 1, wherein the micro high-speed digital valve i, the micro high-speed digital valve ii and the micro high-speed digital valve iii are two-position, two-way, normally closed solenoid valves.

9. Digital hydraulic and electromagnetic composite braking system for disc brakes according to claim 1, characterized in that the electric motor (3) is a direct current motor.

10. Digital hydraulic and electromagnetic composite braking system for disc brakes according to claim 1, characterized in that the hydraulic pump (4) is a gear pump.

Technical Field

The invention relates to a braking system, in particular to a digital hydraulic and electromagnetic composite braking system suitable for a disc brake, and belongs to the technical field of disc brakes.

Background

The disc brake system has the advantages of good high-temperature resistance under high load, stable braking effect and the like, is widely applied to elevators, belt type conveying equipment for metallurgy, ports and mines, and is a key system for ensuring safe and reliable stop of operation. The rotating elements in a friction pair of a disc brake system are metal discs (called brake discs) working on end faces, and the friction elements clamp the brake discs from both sides to generate braking. The disc brake system is applied to mine belt type conveying equipment, can prevent the accidents of car falling and flying caused by failure of the backstop during the upward transportation, can effectively prevent the accidents of car flying, overspeed and the like during the downward transportation, and enables the conveying equipment to be safer and more reliable in transportation.

The existing disc brake system mostly adopts the traditional hydraulic technical scheme, and adopts an overflow valve to control the system pressure, a proportional pressure valve to control the brake cylinder pressure and a reversing valve to control the loading and pressure relief of a brake cylinder. The traditional hydraulic control mode has the following three defects:

1. the conveying equipment usually has a severe working environment, once the proportional valve and the overflow valve are polluted, the elements are difficult to ensure reliable work, and the conveying equipment can be stopped due to the uniqueness of the control elements;

2. because the loading and pressure relief of the brake oil cylinder are realized through the reversing valve, the larger system oscillation generated in the switching process of the working state of the brake system is difficult to avoid, and the whole brake system is damaged to a certain extent;

3. the pressure build-up time of the overflow valve and the proportional pressure valve is generally slow, so that the rapid and accurate braking is difficult, and the requirement on the rapid response of the emergency braking is difficult to meet.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a digital hydraulic and electromagnetic composite braking system for a disc brake, which can meet the requirements of quick response and accurate control on the braking pressure of a braking oil cylinder and is particularly suitable for a braking system of mine belt type conveying equipment.

In order to achieve the purpose, the digital hydraulic and electromagnetic combined braking system for the disc brake comprises a power source unit, a system pressure control valve group, a high-pressure control valve group, a low-pressure control valve group, a braking oil cylinder group, an electromagnetic brake group and a centralized electric control part;

the power source unit comprises an oil tank, a motor, a hydraulic pump and a one-way valve, wherein the input end of the hydraulic pump in transmission connection with the motor is connected with the oil tank, and the output end of the hydraulic pump is connected with the input end of the one-way valve;

the system pressure control valve group comprises a plurality of miniature high-speed digital valves I, wherein the input ends and the output ends of the miniature high-speed digital valves I are respectively communicated and arranged to form a parallel connection structure, the input end of the system pressure control valve group is connected with the output end of a one-way valve, the output end of the system pressure control valve group is connected with an oil tank, and a first pressure sensor for detecting the system pressure is connected with the output end of the one-way valve;

the high-pressure control valve group comprises a plurality of miniature high-speed digital valves II, the input ends and the output ends of the miniature high-speed digital valves II are respectively communicated and arranged to form a parallel connection structure, the input end of the high-pressure control valve group is connected with the output end of the one-way valve, and a second pressure sensor for detecting the output pressure of the high-pressure control valve group is connected with the output end of the high-pressure control valve group;

the low-pressure control valve group comprises a plurality of micro high-speed digital valves III, the input ends and the output ends of the micro high-speed digital valves III are respectively communicated and arranged to form a parallel connection structure, the input end of the low-pressure control valve group is connected with the output end of the high-pressure control valve group, and the output end of the low-pressure control valve group is connected with an oil tank;

the brake oil cylinder group comprises a brake oil cylinder arranged corresponding to the end face of the brake disc, the brake oil cylinder is of a normally closed structure provided with a return spring, the telescopic end of the brake oil cylinder abuts against the end face of the brake disc through a friction element, and the brake oil cylinder is connected with the output end of the high-pressure control valve group;

the electromagnetic brake group comprises an electromagnetic brake arranged corresponding to the end surface of the brake disc;

the centralized electric control part comprises a controller and a brake control loop, wherein the controller is respectively electrically connected with the motor, the miniature high-speed digital valve I, the first pressure sensor, the miniature high-speed digital valve II, the second pressure sensor, the miniature high-speed digital valve III and the electromagnetic brake.

As a further development of the invention, the digital hydraulic and electromagnetic hybrid brake system for a disc brake further comprises an energy accumulator, which is connected to the output of the non-return valve.

As a further improvement scheme of the invention, a return spring of the brake oil cylinder is arranged in a rodless cavity, and a rod cavity of the brake oil cylinder is connected with the output end of the high-pressure control valve group.

As a further improvement scheme of the invention, the brake oil cylinder comprises a first brake oil cylinder and a second brake oil cylinder, the first brake oil cylinder and the second brake oil cylinder are arranged on two sides of the end surface of the brake disc in a left-right opposite mode, the telescopic ends of the first brake oil cylinder and the second brake oil cylinder respectively abut against the end surface of the brake disc through friction elements, and the first brake oil cylinder and the second brake oil cylinder are respectively connected with the output end of the high-pressure control valve group.

In a further improvement of the present invention, the electromagnetic brake includes a first electromagnetic brake and a second electromagnetic brake, and the first electromagnetic brake and the second electromagnetic brake are disposed on both sides of the end surface of the brake disc in a left-right opposed manner.

As a further development of the invention, the power source unit further comprises a filter.

As a further improvement of the invention, the filter comprises a coarse filter and a fine filter, the input end of the hydraulic pump is connected with the oil tank through the coarse filter, and the output end of the hydraulic pump is connected with the input end of the one-way valve through the fine filter.

As a further improvement scheme of the invention, the micro high-speed digital valve I, the micro high-speed digital valve II and the micro high-speed digital valve III are two-position two-way normally closed electromagnetic valves.

In one embodiment of the present invention, the motor is a dc motor.

In one embodiment of the present invention, the hydraulic pump is a gear pump.

Compared with the prior art, the controller for the digital hydraulic and electromagnetic composite braking system of the disc brake can control and regulate the system pressure through the action of the pressure control valve of the PWM control signal control system according to the feedback of the first pressure sensor, so that the safety of the system is protected; when the brake is required to be in a brake release operation state, the controller can control the high-pressure control valve group to act through PWM control signals according to the feedback of the second pressure sensor to perform high-pressure control on rod cavities of the first brake oil cylinder and the second brake oil cylinder, so that the telescopic ends of the first brake oil cylinder and the second brake oil cylinder overcome the elastic force of the return spring and retract, and the friction element is separated from the end face of the brake disc, and meanwhile, the controller controls the low-pressure control valve group to be in a power-off state; when the brake is required to be in a braking state, the controller controls the low-pressure control valve group to act through the PWM control signal to perform low-pressure control on the rod cavities of the first brake oil cylinder and the second brake oil cylinder, so that the telescopic ends of the first brake oil cylinder and the second brake oil cylinder extend out under the elastic force action of the return spring, the friction element abuts against the end face of the brake disc to realize braking, and meanwhile, the controller controls the high-pressure control valve group to be in a power-off state; when heavy load is needed to be braked by the braking system, the system starts two sets of braking devices of hydraulic braking and electromagnetic braking to carry out combined braking, so that the braking disc is rapidly braked; when the braking load required by the system is light load and needs emergency braking, the controller controls the first electromagnetic brake and the second electromagnetic brake to act to tightly hold the brake disc, so that emergency braking can be realized, frequent starting and stopping of the motor and the hydraulic pump can be avoided, the requirements on quick response and accurate control of the braking pressure of the braking oil cylinder can be met, and the braking system is particularly suitable for the braking system of mine belt type conveying equipment.

Drawings

Fig. 1 is a hydraulic schematic of the present invention.

In the figure: 1-an oil tank, 2-a coarse filter, 3-a motor, 4-a hydraulic pump, 5-a fine filter, 6-a one-way valve, 7-a first miniature high-speed digital valve, 8-a second miniature high-speed digital valve, 9-a third miniature high-speed digital valve, 10-an accumulator, 11-a fourth miniature high-speed digital valve, 12-a fifth miniature high-speed digital valve, 13-a sixth miniature high-speed digital valve, 14-a first pressure sensor, 15-a seventh miniature high-speed digital valve, 16-an eighth miniature high-speed digital valve, 17-a ninth miniature high-speed digital valve, 18-a second pressure sensor, 19-a first brake cylinder, 20-a second brake cylinder, 21-a first electromagnetic brake, 22-a second electromagnetic brake and 23-a brake disc.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1, the digital hydraulic and electromagnetic combined brake system for a disc brake includes a power source unit, a system pressure control valve set, a high pressure control valve set, a low pressure control valve set, a brake cylinder set, an electromagnetic brake set, and a centralized electric control portion.

The power source unit include oil tank 1, coarse filter 2, motor 3, hydraulic pump 4, smart filter 5 and check valve 6, the input of the hydraulic pump 4 of being connected with the transmission of motor 3 passes through coarse filter 2 and is connected with oil tank 1, the output of hydraulic pump 4 passes through smart filter 5 and is connected with check valve 6's input.

The system pressure control valve group include first miniature high-speed digital valve 7, the miniature high-speed digital valve 8 of second and the miniature high-speed digital valve 9 of third, first miniature high-speed digital valve 7, the miniature high-speed digital valve 8 of second and the miniature high-speed digital valve 9's of third input and output communicate respectively to set up and be parallel connection structure, the input of system pressure control valve group is connected with the output of check valve 6, the output and the oil tank 1 of system pressure control valve group are connected, a pressure sensor 14 for detecting system pressure is connected with the output of check valve 6.

The high-pressure control valve group comprises a fourth miniature high-speed digital valve 11, a fifth miniature high-speed digital valve 12 and a sixth miniature high-speed digital valve 13, the input ends and the output ends of the fourth miniature high-speed digital valve 11, the fifth miniature high-speed digital valve 12 and the sixth miniature high-speed digital valve 13 are respectively communicated and arranged to form a parallel connection structure, the input end of the high-pressure control valve group is connected with the output end of the check valve 6, and a second pressure sensor 18 for detecting the output pressure of the high-pressure control valve group is connected with the output end of the high-pressure control valve group.

The low-pressure control valve group comprises a seventh miniature high-speed digital valve 15, an eighth miniature high-speed digital valve 16 and a ninth miniature high-speed digital valve 17, the input ends and the output ends of the seventh miniature high-speed digital valve 15, the eighth miniature high-speed digital valve 16 and the ninth miniature high-speed digital valve 17 are respectively communicated and arranged to form a parallel connection structure, the input end of the low-pressure control valve group is connected with the output end of the high-pressure control valve group, and the output end of the low-pressure control valve group is connected with the oil tank 1.

The brake oil cylinder group comprises a first brake oil cylinder 19 and a second brake oil cylinder 20, the first brake oil cylinder 19 and the second brake oil cylinder 20 are arranged on two sides of the end face of the brake disc 23 in a left-right opposite mode, the first brake oil cylinder 19 and the second brake oil cylinder 20 are of a normally closed structure with a return spring arranged in a rodless cavity, the telescopic ends of the first brake oil cylinder 19 and the second brake oil cylinder 20 respectively abut against the end face of the brake disc 23 through friction elements, and the rod cavities of the first brake oil cylinder 19 and the second brake oil cylinder 20 are respectively connected with the output end of the high-pressure control valve group.

The electromagnetic brake group comprises a first electromagnetic brake 21 and a second electromagnetic brake 22, and the first electromagnetic brake 21 and the second electromagnetic brake 22 are arranged on two sides of the end surface of the brake disc 23 in a left-right opposite mode.

The centralized electric control part comprises a controller and a brake control loop, wherein the controller is respectively electrically connected with the motor 3, the first miniature high-speed digital valve 7, the second miniature high-speed digital valve 8, the third miniature high-speed digital valve 9, the first pressure sensor 14, the fourth miniature high-speed digital valve 11, the fifth miniature high-speed digital valve 12, the sixth miniature high-speed digital valve 13, the second pressure sensor 18, the seventh miniature high-speed digital valve 15, the eighth miniature high-speed digital valve 16, the ninth miniature high-speed digital valve 17, the first electromagnetic brake 21 and the second electromagnetic brake 22.

The working principle of the digital hydraulic and electromagnetic composite braking system for the disc brake is as follows: the controller can control and regulate the system pressure through the action of the first miniature high-speed digital valve 7, the second miniature high-speed digital valve 8 or the third miniature high-speed digital valve 9 of the PWM control signal control system pressure control valve group according to the feedback of the first pressure sensor 14, so that the system safety is protected; when the brake release operation state is required, the controller can control the fourth miniature high-speed digital valve 11, the fifth miniature high-speed digital valve 12 or the sixth miniature high-speed digital valve 13 of the high-pressure control valve group to operate to perform high-pressure control on the rod cavities of the first brake oil cylinder 19 and the second brake oil cylinder 20 through PWM control signals according to the feedback of the second pressure sensor 18, so that the telescopic ends of the first brake oil cylinder 19 and the second brake oil cylinder 20 overcome the elastic force of a return spring to retract and a friction element is separated from the end surface of the brake disc 23, and meanwhile, the controller controls the seventh miniature high-speed digital valve 15, the eighth miniature high-speed digital valve 16 and the ninth miniature high-speed digital valve 17 of the low-pressure control valve group to be in a power-off state; when the brake valve needs to be in a braking state, the controller controls the seventh miniature high-speed digital valve 15, the eighth miniature high-speed digital valve 16 or the ninth miniature high-speed digital valve 17 of the low-pressure control valve group to operate through the PWM control signal to perform low-pressure control on the rod cavities of the first brake oil cylinder 19 and the second brake oil cylinder 20, so that the telescopic ends of the first brake oil cylinder 19 and the second brake oil cylinder 20 extend out under the elastic force action of the return spring, the friction element abuts against the end face of the brake disc 23 to realize braking, and meanwhile, the controller controls the fourth miniature high-speed digital valve 11, the fifth miniature high-speed digital valve 12 and the sixth miniature high-speed digital valve 13 of the high-pressure control valve group to be in a power-off state. Because the hydraulic brake performs braking operation through energy conversion of a plurality of physical fields such as electro-magnetic-mechanical-hydraulic fields, the length of a hydraulic pipeline, a pipeline joint, pressure drop of a valve and the like all cause certain energy loss, and the electromagnetic brake directly converts electric energy into magnetic energy and performs mechanical energy braking, the electromagnetic brake has the advantage of quick response; when the braking load required by the system is light load and emergency braking is required, the controller controls the first electromagnetic brake 21 and the second electromagnetic brake 22 to act to hold the brake disc 23 tightly, so that not only can emergency braking be realized, but also frequent starting and stopping of the motor 3 and the hydraulic pump 4 can be avoided.

When the brake system is in a brake release operation state, in order to reduce energy consumption after the system pressure adjustment is finished, as a further improvement of the invention, the digital hydraulic and electromagnetic combined brake system for the disc brake further comprises an energy accumulator 10, and the energy accumulator 10 is connected with the output end of the one-way valve 6. When the brake system is in a brake release operation state, due to the existence of the energy accumulator 10, the motor 3 and the hydraulic pump 4 can be stopped after the pressure adjustment of the system is finished, and oil liquid in the energy accumulator 10 can enter the rod cavities of the first brake oil cylinder 19 and the second brake oil cylinder 20 through the high-pressure control valve group to perform pressure maintaining and leakage compensation on the system.