Safety tongs brake electro-hydraulic control system with electromagnetic quick discharge valve and control method

Abstract

The invention discloses a safety tongs brake electro-hydraulic control system with an electromagnetic quick discharge valve and a control method. The system comprises an oil source system, a control system and a far-end control system, and a safety tongs oil cylinder of the far-end control system is connected with the control system through an oil way and is directly connected with an oil tank through an electromagnetic quick discharge valve via an independent oil way. Under the normal working condition, the oil source supplies pressure to the oil cylinder through the control system; during emergency braking, the PLC controls the electromagnetic quick discharge valve to be powered off, oil of the oil cylinder is subjected to quick pressure relief through the direct discharge loop, meanwhile, the main pressure relief loop is synchronously started, and double-loop redundant pressure relief is formed; the electromagnetic quick discharge valve is integrated at the oil cylinder end, so that the pressure relief path is shortened, the influence of internal faults of the hydraulic station is avoided, quick response of the safety tongs is achieved, the reliability and safety of the system are improved, and the system is suitable for emergency braking scenes of drilling machine hydraulic disc type brakes.

Description

Technical Field

[0001] This invention relates to the field of hydraulic disc brake technology for drilling rigs, specifically to a safety gear brake electro-hydraulic control system and control method with an electromagnetic quick-release valve. Background Technology

[0002] In the field of oil drilling rigs, the safety clutch cylinder in a hydraulic disc brake system is a key component for emergency braking. When the drilling rig encounters emergency situations such as a power outage of the main motor or loss of winch suspension, the safety clutch needs to quickly depressurize to trigger the disc spring brake, ensuring the safety of personnel and equipment. Existing electro-hydraulic control systems for safety clutch brakes mainly control the pressure relief circuit through a series connection of components such as an emergency brake solenoid valve and a pneumatic directional valve. This technical solution has significant drawbacks: On the one hand, the hydraulic station and the safety clamp cylinder are connected by a long hydraulic hose, and the circuit includes multiple components such as an emergency braking solenoid valve, a pneumatic directional valve, and quick-connect couplings. This results in a long hydraulic pressure relief path and high resistance during emergency braking, leading to a delayed response from the safety clamp. Actual test data shows that the traditional system has a long pressure relief time, which cannot meet the drilling rig's "golden braking time" requirement and poses a risk of winch slippage.

[0003] On the other hand, existing systems rely on the internal oil return circuit of the hydraulic station. If internal components of the hydraulic station (such as solenoid valves and branch circuits) malfunction or become blocked, the safety clamp cylinder cannot release pressure in an emergency, directly leading to brake failure. According to industry statistics, brake failure accidents caused by internal malfunctions of the hydraulic station are numerous, seriously threatening construction safety.

[0004] Furthermore, traditional systems employ a single-loop pressure relief design, lacking redundant protection mechanisms. When a component fails, there is no backup path, resulting in low system reliability. Therefore, there is an urgent need for a safety clamp brake electro-hydraulic control system that can achieve rapid pressure relief, possess fault redundancy, and provide reliable response, to address the issues of slow response and significant safety hazards in existing technologies. Summary of the Invention

[0005] The present invention aims to overcome the shortcomings of the prior art and provide a safety clamp brake electro-hydraulic control system and control method with an electromagnetic quick-release valve.

[0006] The technical solution adopted in this invention is as follows: A safety clamp brake electro-hydraulic control system with an electromagnetic quick-release valve includes: Oil supply system: Equipped with a safety clamp oil source and a return oil tank; Remote control system: includes safety clamp cylinder, oil circuit D, oil circuit G, oil circuit H and second solenoid pneumatic control valve; Control system: Connects the oil supply system and the remote control system to control the pressure relief of the safety clamp; The safety clamp cylinder is connected to the control system via hydraulic circuit D; The second electromagnetic pneumatic control valve is connected to the safety clamp cylinder via oil circuit G and to the return oil tank via oil circuit H. During emergency braking, the second electromagnetic control valve is de-energized and activated, causing the hydraulic fluid in the safety clamp cylinder to be directly discharged back to the oil tank via oil circuit G - second electromagnetic control valve - oil circuit H, forming an independent pressure relief circuit.

[0007] Furthermore, the control system includes: oil circuit A, oil circuit B, oil circuit C, oil circuit E, oil circuit F, pneumatic directional valve, and first solenoid pneumatic valve; The pneumatically controlled directional valve is connected to oil lines A, B, and E. The pneumatically controlled directional valve is connected to the oil source through oil line A and to the return oil tank through oil line E. The first solenoid pneumatic control valve is connected to oil circuits B, C, and F. The first solenoid pneumatic control valve is connected to the pneumatic control directional valve through oil circuit B and to the return oil tank through oil circuit F.

[0008] Furthermore, the remote control system includes hydraulic circuit D and safety clamp cylinder; The safety clamp cylinder is connected to the control system hydraulic circuit via hydraulic circuit D and hydraulic circuit C. Under normal energized conditions, the pneumatic reversing valve and the first solenoid pneumatic valve connect the safety clamp oil source and the safety clamp cylinder through oil circuit A-oil circuit B-oil circuit C-oil circuit D. Under energized conditions, the oil circuit is switched, and the safety clamp cylinder is connected to the return oil tank through oil circuit D-oil circuit C-oil circuit E or / and oil circuit F to form a return oil passage, thereby achieving braking.

[0009] Furthermore, the pneumatically controlled directional valve is connected to an emergency braking solenoid valve that controls its internal connecting pipeline.

[0010] Furthermore, a quick-connect coupling is installed between oil circuit D and oil circuit C.

[0011] Furthermore, oil circuit A is equipped with a pressure switch, and oil circuits B, C, and D are equipped with pressure sensors and / or pressure gauges.

[0012] Furthermore, a control method for a safety clamp brake electro-hydraulic control system with an electromagnetic quick-release valve includes the following steps: Normal operating conditions: The first electromagnetic pneumatic control valve is energized, opening oil circuit B-oil circuit C; When the emergency braking solenoid valve is energized, the pneumatic directional valve opens the oil circuit A-oil circuit B. The second electromagnetic pneumatic control valve is energized, blocking oil circuit G-oil circuit H; The oil source supplies pressure to the safety clamp cylinder via oil lines A, B, C, and D; Braking conditions: a. Direct discharge pressure relief circuit start-up: De-energize the second electromagnetic pneumatic control valve, connect oil circuit G-oil circuit H, and discharge oil directly into the oil tank; b. Main pressure relief circuit starts: The first electromagnetic pneumatic control valve loses power, opening oil circuit C-oil circuit F; When the emergency braking solenoid valve loses power, the pneumatic directional valve cuts off oil circuit A-oil circuit B and opens oil circuit B-oil circuit E. c. The hydraulic cylinder fluid is discharged through two separate routes: First route: Oil line D - Oil line C - Oil line F - Return oil tank or / and oil line D - Oil line C - Oil line B - Oil line E - Return oil tank Second route: Oil line G - Oil line H - Return oil tank.

[0013] Furthermore, in an emergency, the pneumatic directional valve is controlled by the emergency braking solenoid valve to cut off oil circuit A-oil circuit B and open oil circuit B-oil circuit E, connecting the return oil path: oil circuit D-oil circuit C-oil circuit B-oil circuit E-return oil tank.

[0014] Furthermore, this includes a PLC, which is used to execute synchronous triggering programs, specifically including: A power failure signal is simultaneously sent to the first electromagnetic pneumatic control valve and the second electromagnetic pneumatic control valve. Send a de-energization signal to the emergency brake solenoid valve to reset the pneumatic directional valve to the pressure relief position where oil circuit B connects to oil circuit E.

[0015] Furthermore, if a pressure sensor or / and pressure gauge detects an abnormal pressure, it transmits a signal to the PLC to de-energize the first solenoid valve, the second solenoid valve, and the emergency brake solenoid valve to achieve braking.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: Rapid response braking: During emergency braking, the electromagnetic quick-release valve directly connects the hydraulic cylinder and the oil tank through the direct discharge circuit, avoiding the resistance of the hydraulic station's long pipeline and multiple components, shortening the pressure relief time, and eliminating the risk of winch slippage.

[0017] Dual safety redundancy: The main pressure relief circuit and the direct discharge circuit are designed in parallel. When the internal components of the hydraulic station fail or the pipeline is blocked, the other circuit can still work independently, which improves the system reliability and solves the potential failure of a single circuit.

[0018] Intelligent monitoring and protection: Multi-point pressure sensors are linked with PLC to monitor oil circuit abnormalities in real time. When pressure fluctuations exceed the threshold, dual-circuit pressure relief is automatically triggered, which can brake earlier than manual intervention and ensure safety protection meets standards.

[0019] Ease of maintenance: The quick-connect coupling and flexible hydraulic hose design support tool-free disassembly and assembly, adapt to the vibration environment of the drilling rig, improve maintenance efficiency, and the direct discharge circuit has no intermediate components, reducing maintenance nodes.

[0020] This system combines structural innovation with intelligent control to comprehensively improve the safety and reliability of emergency braking of drilling rigs, meeting the safety requirements of high-risk scenarios in oil drilling. Attached Figure Description

[0021] Figure 1 This is a hydraulic schematic diagram of the safety clamp brake electro-hydraulic control system of the present invention (Note: The connection status of each valve in the diagram indicates the emergency braking condition); Figure 2 This is a table showing the gain and loss of power status of each solenoid valve under emergency braking conditions in the hydraulic schematic diagram of the safety clamp brake electro-hydraulic control system of the present invention.

[0022] Marked in the image: 1-Oil source system, 11-Safety clamp oil source, 12-Return oil tank, 2-Control system, 21-Oil circuit A, 22-Oil circuit B, 23-Oil circuit C, 24-Pneumatic directional valve, 25-Oil circuit E, 26-Oil circuit F, 27-First solenoid pneumatic control valve, 28-Emergency brake solenoid valve, 3-Remote control system, 31-Safety clamp cylinder, 32-Oil circuit D, 33-Oil circuit G, 34-Oil circuit H, 35-Second solenoid pneumatic control valve, 4-Pressure switch, 5-Pressure sensor / pressure gauge. Detailed Implementation

[0023] The present invention will now be described in detail with reference to the accompanying drawings.

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0025] In this embodiment, as Figure 1 As shown, a safety clamp brake electro-hydraulic control system 2 with an electromagnetic quick-release valve includes: Oil supply system 1: Equipped with safety clamp oil source 11 and return oil tank 12; Control system 2: Connects the oil supply system 1 to the remote control system 32, and is used to control the pressure relief of the safety clamp; Remote control system 32: includes safety clamp cylinder 31, oil circuit D32, oil circuit G33, oil circuit H34, and second solenoid pneumatic control valve 35; Safety clamp cylinder 31 is connected to control system 2 via oil circuit D32; The second electromagnetic pneumatic control valve 35 is connected to the safety clamp cylinder 31 through oil circuit G33 and to the return oil tank 12 through oil circuit H34. During emergency braking, the second electromagnetic control valve 35 is de-energized and conducts, causing the oil in the safety clamp cylinder 31 to be directly discharged back to the oil tank 12 via oil circuit G33-second electromagnetic control valve 35-oil circuit H34, forming an independent pressure relief circuit.

[0026] Specifically: Oil source system 1: includes safety clamp oil source 11 (provides high-pressure oil) and return oil tank 12 (receives pressure relief oil).

[0027] Control system 2: Connects the oil source to the remote control system 32 and is used to control the on / off state of the main oil circuit.

[0028] Remote control system 32: Safety clamp cylinder 31 is connected to control system 2 through oil circuit D32; second electromagnetic pneumatic control valve 35 is connected to the rod chamber of safety clamp cylinder 31 through oil circuit G33, and directly connected to return oil tank 12 through oil circuit H34.

[0029] Under normal operating conditions: When the second solenoid pneumatic control valve 35 is energized, it blocks the oil circuit G33-H34, and the safety clamp cylinder 31 is kept in a non-braking state by the oil source.

[0030] Emergency braking: The PLC sends a signal to de-energize the second solenoid pneumatic control valve 35, and the oil circuit G33-H34 is opened. The oil in the safety clamp cylinder 31 is discharged directly to the oil tank through oil circuit G33 → second solenoid pneumatic control valve 35 → oil circuit H34, forming an independent pressure relief circuit.

[0031] In existing technologies, the long pipelines and numerous components between the hydraulic power unit and the cylinder result in slow pressure relief. This embodiment integrates a solenoid quick-release valve at the cylinder end, allowing the oil to be directly connected to the oil tank. This avoids the impact of internal component failures or pipeline blockages in the hydraulic power unit, shortens the pressure relief path, and effectively prevents the risk of drill slippage.

[0032] Furthermore, the control system 2 includes: oil circuit A21, oil circuit B22, oil circuit C23, oil circuit E25, oil circuit F26, pneumatic directional valve 24, and first solenoid pneumatic valve 27; The pneumatically controlled directional valve 24 is connected to oil circuits A21, B22, and E25. The pneumatically controlled directional valve 24 is connected to the oil source through oil circuit A21 and to the return oil tank 12 through oil circuit E25. The first electromagnetic pneumatic control valve 27 is connected to oil circuits B22, C23, and F26. The first electromagnetic pneumatic control valve 27 is connected to the pneumatic control directional valve 24 through oil circuit B22 and to the return oil tank 12 through oil circuit F26.

[0033] Specifically, control system 2 includes oil circuits: oil circuit A21 (oil source → pneumatic directional valve 24), oil circuit B22 (pneumatic directional valve 24 → first solenoid pneumatic valve 27), oil circuit C23 (first solenoid pneumatic valve 27 → quick-connect coupling), oil circuit E25 (pneumatic directional valve 24 → oil tank), and oil circuit F26 (first solenoid pneumatic valve 27 → oil tank). Pneumatic directional valve 24 is connected to the oil source through oil circuit A21 and to the oil tank through oil circuit E25. First solenoid pneumatic valve 27 is connected to pneumatic directional valve 24 through oil circuit B22 and to the oil tank through oil circuit F26.

[0034] Under normal operating conditions: When the first solenoid pneumatic control valve 27 is energized, it connects oil circuit B22 to oil circuit C23. When the pneumatic control reversing valve 24 is energized, it connects oil circuit A21 to oil circuit B22. The oil source supplies pressure to the oil cylinder through oil circuit A21 → oil circuit B22 → oil circuit C23 → oil circuit D32.

[0035] Braking condition: The first solenoid pneumatic control valve 27 is de-energized, opening the oil circuit C23-oil circuit F26, and the oil returns to the oil tank via oil circuit C23→oil circuit F26; at the same time, the pneumatic control reversing valve 24 is de-energized, cutting off the oil circuit A21-oil circuit B22, and opening the oil circuit B22-oil circuit E25, and the oil returns to the oil tank via oil circuit B22→oil circuit E25.

[0036] Dual-circuit redundancy: The main pressure relief circuit (oil circuit D32→oil circuit C23→oil circuit F26 or oil circuit D32→oil circuit C23→oil circuit B22→oil circuit E25) forms parallel redundancy with the direct discharge circuit of Example 1. When internal components of the hydraulic station (such as the first solenoid pneumatic control valve 27) fail, the other circuit can still work, improving system reliability by more than 90% and solving the braking failure problem caused by blockage in the traditional single circuit.

[0037] Furthermore, the remote control system 32 includes an oil circuit D32 and a safety clamp cylinder 31; The safety clamp cylinder 31 is connected to the control system 2 via oil circuit D32 and oil circuit C23. Under normal energized conditions, the pneumatic reversing valve 24 and the first solenoid pneumatic control valve 27 connect the safety clamp oil source 11 and the safety clamp cylinder 31 through oil circuit A21-oil circuit B22-oil circuit C23-oil circuit D32. Under energized conditions, the oil circuit is switched and connected, and the safety clamp cylinder 31 is connected to the return oil tank 12 through oil circuit E25 and / or oil circuit F26 to form a return oil passage, thereby achieving braking.

[0038] Specifically, the remote control system 32: the safety clamp cylinder 31 is connected to the oil circuit C23 via the oil circuit D32 (through quick-connect coupling and hydraulic hose) to form the main oil circuit channel.

[0039] Under normal power-on conditions: the pneumatic reversing valve 24 and the first solenoid pneumatic control valve 27 are energized, and the oil source supplies pressure to the oil cylinder through oil circuit A21→oil circuit B22→oil circuit C23→oil circuit D32. The rod chamber of the oil cylinder is pressurized, the disc spring is compressed, and the brake pads are released.

[0040] Power failure condition: When the pneumatic reversing valve 24 loses power, it cuts off oil circuit A21-oil circuit B22 and opens oil circuit B22-oil circuit E25; the first solenoid pneumatic control valve 27 opens oil circuit C23-oil circuit F26, and the oil in the cylinder returns to the oil tank via oil circuit D32→oil circuit C23→oil circuit F26 or oil circuit D32→oil circuit C23→oil circuit B22→oil circuit E25. The disc spring resets and pushes the brake block to brake.

[0041] Oil circuit switching logic: Oil circuit switching is achieved through solenoid valve de-energization reset, avoiding reliance on the complex internal oil circuits of the hydraulic station. In emergency situations such as main motor power failure, even if the hydraulic station power fails, the solenoid valve can still automatically switch to the pressure relief state upon power failure, ensuring the safety logic of "power failure braking" and complying with drilling rig safety regulations.

[0042] Furthermore, the pneumatically controlled directional valve 24 is connected to an emergency braking solenoid valve 28 that controls its internal connecting pipes.

[0043] Specifically, the pneumatic reversing valve 24 is connected to the emergency braking solenoid valve 28, and the position of its valve core is controlled by the energization and de-energization of the emergency braking solenoid valve 28.

[0044] In non-emergency situations: When the emergency braking solenoid valve 28 is energized, the output air pressure pushes the pneumatic control directional valve 24 to the left position, connecting oil circuit A21 and oil circuit B22.

[0045] Emergency braking: When the emergency braking solenoid valve 28 is de-energized, the air pressure is released, and the pneumatic control directional valve 24 is opened to the right under the action of the spring force, cutting off oil circuit A21-oil circuit B22 and opening oil circuit B22-oil circuit E25, so that oil circuit B22 is connected to the oil tank, thereby realizing the depressurization of the main circuit.

[0046] Failure protection mechanism: When the emergency braking solenoid valve 28 loses power, the pneumatically controlled directional valve 24 is forced to reset, ensuring that even if the internal oil circuit pressure of the hydraulic station is abnormal, pressure relief can still be achieved through mechanical reset. This design avoids the defect of the traditional pneumatically controlled directional valve 24 relying on continuous air pressure to maintain the passage, and can still reliably brake in the event of air source failure, thus improving safety.

[0047] Furthermore, a quick-connect coupling is provided between oil circuit D32 and oil circuit C23, and they are connected by a hydraulic hose.

[0048] Oil circuit D32 and oil circuit C23 are connected via quick-connect couplings and hydraulic hoses, which are made of high-pressure oil-resistant material.

[0049] Quick-connect couplings allow for tool-free assembly and disassembly, facilitating cylinder maintenance; flexible hydraulic hose connections adapt to drilling rig vibration environments, avoiding the risk of rigid pipe breakage.

[0050] During braking: the oil flows from oil circuit D32 to oil circuit C23 through the rubber hose, and is connected in parallel with the direct discharge circuit (oil circuit G33-oil circuit H34) to relieve pressure.

[0051] Furthermore, oil circuit A21 is equipped with a pressure switch 4, and oil circuits B22, C23, and D32 are equipped with pressure sensors 5 and / or pressure gauges 5.

[0052] Specifically, oil circuit A21: pressure switch 4 is installed for low pressure alarm.

[0053] Oil circuits B22, C23, and D32: respectively equipped with pressure sensors 5 and / or pressure gauges 5 to monitor the pressure of each section in real time.

[0054] Normal monitoring: Pressure sensor 5 transmits data to PLC. When the pressure in oil circuit A21 is lower than the set value, pressure switch 4 triggers an audible and visual alarm.

[0055] Braking trigger: If the pressure sensor 5 of oil circuit D32 detects abnormal fluctuations (such as sudden pressure drop), the PLC automatically sends a signal to the solenoid valve to start the pressure relief circuit.

[0056] Active safety monitoring: Through multi-point pressure monitoring, real-time identification of anomalies such as oil source failure (e.g., oil pump failure), pipeline leakage, and component jamming is achieved. For example, when the internal components of the hydraulic station are blocked, causing a sudden increase in oil circuit B22 pressure, the sensor immediately feeds back to the PLC, triggering the brake in advance to avoid accidents caused by delayed pressure relief.

[0057] Furthermore, a control method for a safety clamp brake electro-hydraulic control system 2 with an electromagnetic quick-release valve includes the following steps: Normal operating conditions: The first electromagnetic pneumatic control valve 27 is energized, connecting oil circuit B22 to oil circuit C23; When the emergency braking solenoid valve 28 is energized, the pneumatic directional valve 24 opens the oil circuit A21-oil circuit B22; The second electromagnetic pneumatic control valve 35 is energized, blocking the oil circuit G33-oil circuit H34; The oil source supplies pressure to the safety clamp cylinder 31 via oil circuit A21-oil circuit B22-oil circuit C23-oil circuit D32; Braking conditions: a. Direct discharge pressure relief circuit start-up: Control the second electromagnetic pneumatic control valve 35 to de-energize, conduct oil circuit G33-oil circuit H34, and the oil is directly discharged into the oil tank; b. Main pressure relief circuit starts: The first electromagnetic pneumatic control valve 27 is de-energized, opening the oil circuit C23-oil circuit F26; When the emergency braking solenoid valve 28 is de-energized, the pneumatic directional valve 24 cuts off oil circuit A21-oil circuit B22 and opens oil circuit B22-oil circuit E25. c. The hydraulic cylinder fluid is discharged through two separate routes: First route: Oil line D32 - Oil line C23 - Oil line F26 - Return oil tank 12 or / and oil line D32 - Oil line C23 - Oil line B22 - Oil line E25 - Return oil tank 12, Second route: Oil line G33 - Oil line H34 - Return oil tank 12.

[0058] When both circuits depressurize simultaneously, the oil flow rate increases and the depressurization time is shortened. For example, if the main circuit is blocked and depressurization is not smooth due to hydraulic station blockage, the direct discharge circuit can still ensure that the cylinder completes depressurization in a short time, meeting the "golden time" requirement for emergency braking of the drilling rig.

[0059] Furthermore, in an emergency, the pneumatic directional valve 24 is controlled by the emergency braking solenoid valve 28 to cut off oil circuit A21-oil circuit B22 and open oil circuit B22-oil circuit E25, connecting the return oil path: oil circuit D32-oil circuit C23-oil circuit B22-oil circuit E25-return oil tank 12.

[0060] In an emergency, the emergency braking solenoid valve 28 can be manually controlled to shut off oil circuit A21-B22 and open oil circuit B22-E25 via the pneumatic directional valve 24, opening the return oil path: oil circuit D32-C23-B22-E25-return oil tank 12. This ensures that manual operation can still be performed even if other electronic control components fail, guaranteeing the safe and reliable operation of the system.

[0061] Furthermore, synchronous triggering is executed via PLC, specifically including: A power failure signal is simultaneously sent to the first electromagnetic pneumatic control valve 27 and the second electromagnetic pneumatic control valve 35. A de-energization signal is sent to the emergency brake solenoid valve 28, causing the pneumatic directional valve 24 to reset to the pressure relief position of oil circuit B22 connecting to oil circuit E25.

[0062] To avoid uneven braking force caused by differences in the depressurization sequence and improve braking stability.

[0063] Furthermore, if the pressure sensor 5 or / and the pressure gauge 5 detects an abnormal pressure, it will transmit a signal to the PLC to de-energize the first solenoid valve 27, the second solenoid valve 35, and the emergency brake solenoid valve 28 to achieve braking.

[0064] This feature effectively prevents drill slippage accidents caused by leaks, thus improving the level of safety protection.

[0065] The above description is merely a preferred embodiment of the invention and is not intended to limit the invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. An electro-hydraulic control system (2) of a safety brake with an electromagnetic quick-release valve, characterized in that, The application relates to a safety clamp control system. The oil source system (1) is provided with a safety clamp oil source (11) and an oil return tank (12); The remote control system (3) (2) comprises a safety clamp oil cylinder (31), an oil path D (32), an oil path G (33), an oil path H (34) and a second electromagnetic pneumatic control valve (35); The control system (2) is connected with the oil source system (1) and the remote control system (3) (2) and is used for controlling the safety clamp pressure relief. The safety clamp oil cylinder (31) is connected with the control system (2) through the oil path D (32). The second electromagnetic pneumatic control valve (35) is connected with the safety clamp oil cylinder (31) through the oil path G (33) and is connected with the oil return tank (12) through the oil path H (34). When emergency braking is performed, the second electromagnetic pneumatic control valve (35) is powered off to be conducted, the safety clamp oil cylinder (31) oil liquid is directly discharged into the oil return tank (12) through the oil path G (33)-the second electromagnetic pneumatic control valve (35)-the oil path H (34), and an independent pressure relief circuit is formed.

2. The safety brake electro-hydraulic control system (2) with electromagnetic quick valve of claim 1, characterized in that: The control system (2) comprises an oil path A (21), an oil path B (22), an oil path C (23), an oil path E (25), an oil path F (26), a pneumatic reversing valve (24) and a first electromagnetic pneumatic control valve (27). The pneumatic reversing valve (24) is connected with the oil path A (21), the oil path B (22) and the oil path E (25), the pneumatic reversing valve (24) is connected with the oil source through the oil path A (21) and is connected with the oil return tank (12) through the oil path E (25). The first electromagnetic pneumatic control valve (27) is connected with the oil path B (22), the oil path C (23) and the oil path F (26), the first electromagnetic pneumatic control valve (27) is connected with the pneumatic reversing valve (24) through the oil path B (22) and is connected with the oil return tank (12) through the oil path F (26).

3. The safety brake electro-hydraulic control system (2) with electromagnetic quick-release valve according to claim 2, characterized in that: The remote control system (3) (2) comprises the oil path D (32) and the safety clamp oil cylinder (31). The safety clamp oil cylinder (31) is connected with the oil path C (23) through the oil path D (32) and is connected with the control system (2) oil path. The pneumatic reversing valve (24) and the first electromagnetic pneumatic control valve (27) are connected with the safety clamp oil source (11) and the safety clamp oil cylinder (31) through the oil path A (21)-the oil path B (22)-the oil path C (23)-the oil path D (32) in a normal power-on working condition, the oil path D (32)-the oil path C (23)-the oil path E (25) or / and the oil path F (26) are switched in a power-off working condition, the safety clamp oil cylinder (31) is connected with the oil return tank (12) to form an oil return passage, and braking is realized.

4. The safety brake electro-hydraulic control system (2) with electromagnetic quick valve of claim 2, characterized in that: The pneumatic reversing valve (24) is connected with an emergency braking electromagnetic valve (28) for controlling the internal communication pipeline of the pneumatic reversing valve (24).

5. The electro-hydraulic control system (2) of a safety brake with electromagnetic quick-release valve according to claim 3, characterized in that: Quick change joints are arranged between the oil path D (32) and the oil path C (23).

6. The safety clamping brake electro-hydraulic control system (2) with electromagnetic quick release valve according to claim 1, characterized in that: The oil path A (21) is provided with a pressure switch (4), and the oil path B (22), the oil path C (23) and the oil path D (32) are provided with pressure sensors (5) or / and pressure gauges (5).

7. A control method of the electro-hydraulic control system (2) of the safety brake with electromagnetic quick-release valve, applied to the electro-hydraulic control system (2) of the safety brake with electromagnetic quick-release valve according to any one of claims 1-6, characterized in that: The application further relates to a safety clamp control method. Normal working condition: The first electromagnetic pneumatic control valve (27) is powered on to conduct the oil path B (22)-the oil path C (23). The emergency brake solenoid valve (28) is powered on, and the pneumatic directional valve (24) is connected to the oil passage A (21)-oil passage B (22); The second electromagnetic pneumatic valve (35) is powered on, and the oil passage G (33)-oil passage H (34) is blocked; The oil source supplies pressure to the safety clamp oil cylinder (31) through the oil passage A (21)-oil passage B (22)-oil passage C (23)-oil passage D (32); Braking condition: a. Direct exhaust pressure circuit starts: control the second electromagnetic pneumatic valve (35) to lose power, connect the oil passage G (33)-oil passage H (34), and the oil liquid is directly discharged to the oil tank; b. Main exhaust circuit starts: The first electromagnetic pneumatic valve (27) loses power, and the oil passage C (23)-oil passage F (26) is connected; The emergency brake solenoid valve (28) loses power, and the pneumatic directional valve (24) is cut off from the oil passage A (21)-oil passage B (22) and connected to the oil passage B (22)-oil passage E (25); c. The oil cylinder oil liquid is discharged in two ways: First way: oil passage D (32)-oil passage C (23)-oil passage F (26)-oil tank (12) or / and oil passage D (32)-oil passage C (23)-oil passage B (22)-oil passage E (25)-oil tank (12), Second way: oil passage G (33)-oil passage H (34)-oil tank (12).

8. The control method of the safety brake electro-hydraulic control system (2) with electromagnetic quick-release valve according to claim 7, characterized in that: In an emergency, the pneumatic directional valve (24) is controlled by the emergency brake solenoid valve (28) to cut off the oil passage A (21)-oil passage B (22) and connect the oil passage B (22)-oil passage E (25), and the oil return path: oil passage D (32)-oil passage C (23)-oil passage B (22)-oil passage E (25)-oil tank (12) is connected.

9. The control method of the safety brake electro-hydraulic control system (2) with electromagnetic quick-release valve according to claim 7, characterized in that: The PLC is used to execute the synchronous trigger program, specifically including: Send a power-off signal to the first electromagnetic pneumatic valve (27) and the second electromagnetic pneumatic valve (35) at the same time; Send a power-off signal to the emergency brake solenoid valve (28), so that the pneumatic directional valve (24) resets to the pressure relief position of the oil passage B (22) to the oil passage E (25).

10. The control method of the safety brake electro-hydraulic control system (2) with electromagnetic quick-release valve according to claim 9, characterized in that: The pressure sensor (5) or / and the pressure gauge (5) detects pressure abnormalities, and sends a signal to the PLC to control the first electromagnetic pneumatic valve (27), the second electromagnetic pneumatic valve (35) and the emergency brake solenoid valve (28) to lose power to achieve braking.

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