Safety clamp oil cylinder with electromagnetic quick-release valve

Abstract

The present application relates to a safety clamp cylinder with electromagnetic quick release valve for drilling rig hydraulic disc brake system. The cylinder includes cylinder barrel, piston, disc spring and rod cavity, and the innovation is that the rod cavity integrates parallel double relief circuits: the main relief circuit is directly connected to the remote hydraulic station through the first oil way; the emergency direct discharge circuit is controlled by the electromagnetic quick release valve, and is directly connected to the oil tank through the second oil way, valve body and third oil way. When emergency braking, the electromagnetic valve is opened to open the emergency circuit, and the oil is discharged through the double paths, and the piston pushes the brake block under the action of the disc spring. The present application shortens the relief path through the integrated design of the valve body and the cylinder barrel, has short response time, and builds a redundant safety mechanism, which can still discharge independently when the hydraulic station fails, completely solves the problems of braking lag and single point failure, and improves the safety of drilling equipment.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic disc brake technology for drilling rigs, specifically to a safety clamp cylinder with an electromagnetic quick-release valve. Background Technology

[0002] In the oil drilling and production field, winch hydraulic disc brakes rely on safety clamp cylinders for emergency braking. In existing technology, the safety clamp cylinder is connected to a remote hydraulic station via hydraulic hoses and quick-connect couplings, and the rod chamber is depressurized by a solenoid valve within the hydraulic station. When the main motor loses power or the hovering mechanism fails, the cylinder must quickly release oil, causing the disc spring to push the piston to press against the brake disc. However, this design has a serious flaw: 1. Delayed braking response The hydraulic circuit path is too long, including components such as hoses, multi-stage valve bodies, and quick-change couplings, resulting in high oil flow resistance; When depressurization occurs, the oil needs to flow through complex branch circuits, which causes the safety clamp to delay its action and the winch to slip.

[0003] 2. High risk of single point of failure The pressure relief relies entirely on the internal oil circuit of the hydraulic station. If the solenoid valve is stuck, the pneumatic directional valve is faulty, or the pipeline is blocked, the safety clamp cannot relieve pressure and brake. 3. Lack of redundancy mechanisms The existing hydraulic cylinders have only a single pressure relief channel and no emergency backup circuit; when the hydraulic station is under maintenance, the entire braking system is shut down, and the equipment safety is reduced to zero.

[0004] Therefore, there is an urgent need for an integrated redundant pressure relief cylinder that can shorten the pressure relief path and build a dual-circuit safety mechanism to fundamentally solve the problems of braking lag and system reliability. Utility Model Content

[0005] The present invention aims to overcome the shortcomings of the prior art and provide a safety clamp cylinder with an electromagnetic quick-release valve.

[0006] The technical solution adopted in this utility model is as follows: A safety clamp cylinder with an electromagnetic quick-release valve includes a cylinder barrel, an oil tank, a piston, disc springs and a rod chamber disposed on both sides of the piston, the rod chamber being provided with a pressure relief system, the pressure relief system including a main pressure relief circuit and at least one emergency direct discharge circuit; The main pressure relief circuit is equipped with a first oil circuit, and the main pressure relief circuit is connected to the rod chamber and the remote hydraulic station through the first oil circuit; The emergency direct discharge circuit is connected to the rod chamber and the oil tank, and is equipped with an electromagnetic quick discharge valve for controlling the on / off state of the emergency direct discharge circuit.

[0007] Furthermore, the emergency direct discharge circuit includes a second oil circuit and a third oil circuit. The second oil circuit connects the rod chamber to the oil inlet of the electromagnetic quick discharge valve, and the third oil circuit connects the oil outlet of the electromagnetic quick discharge valve to the oil tank. Alternatively, the emergency direct discharge circuit may include a second oil circuit, which connects the rod chamber to the oil inlet of the electromagnetic quick discharge valve, and the oil outlet of the electromagnetic quick discharge valve is directly connected to the oil tank.

[0008] Furthermore, both the first and second oil passages are drawn from the rod chamber.

[0009] Furthermore, a cylinder head is provided on the side of the cylinder barrel where the rod chamber is located, and both the first oil passage and the second oil passage are led out from the cylinder head or the cylinder barrel at one end of the rod chamber.

[0010] Furthermore, both the second and third oil passages are located inside the cylinder head or inside the cylinder barrel at one end of the rod chamber. Alternatively, the second oil passage may be located inside the cylinder head or the cylinder barrel at one end of the rod chamber, with the oil outlet of the electromagnetic quick exhaust valve directly connected to the oil tank.

[0011] Furthermore, the second and third oil circuits are designed to be compatible with the installation position of the electromagnetic quick-release valve.

[0012] Furthermore, the electromagnetic quick-release valve is fixed to the outer wall of the safety clamp cylinder and is used to control the on / off state of the emergency direct discharge circuit.

[0013] Furthermore, the outer wall of the safety clamp cylinder is provided with a valve body mounting platform, and the electromagnetic quick exhaust valve is fixed on the platform. After installation, the second oil circuit is coaxially connected to the oil inlet of the valve body, and the third oil circuit is coaxially connected to the oil outlet of the valve body and connects the valve body to the oil tank; or after installation, the second oil circuit is coaxially connected to the oil port of the valve body, and the oil outlet of the valve body is directly connected to the oil tank.

[0014] The electromagnetic quick-release valve can be fixed to the aforementioned platform by clamps, bolts, or other means.

[0015] Furthermore, quick-connectors are installed on one side of the outlet of the first and third oil lines.

[0016] Furthermore, the electromagnetic quick-release valve, in its default de-energized state, connects the second and third oil circuits.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are: Improved braking response speed: The electromagnetic quick-release valve is directly integrated into the outer wall of the cylinder. The emergency circuit is shorter than the remote control circuit of the traditional hydraulic station, the oil flow resistance is reduced, the pressure relief time is shortened, and the risk of winch slippage is effectively curbed.

[0018] Dual-loop redundancy safety mechanism: The main pressure relief circuit and the emergency direct discharge circuit are physically isolated: The main pressure relief circuit is always directly connected to the hydraulic station, while the emergency direct discharge circuit is independently controlled by a solenoid valve. When the hydraulic station is blocked, the emergency circuit can still discharge the oil directly to the tank through the emergency direct discharge circuit, thus improving braking reliability. Structural optimization and ease of maintenance: Oil passages are integrated into the cylinder / cylinder head wall: eliminating leakage points from external hoses and reducing maintenance costs; Valve body platform installation: fixed by clamps / bolts, with short replacement time.

[0019] Intrinsically safe design: It adopts a normally open two-position two-way valve, which automatically connects the emergency circuit when the power is off, meeting safety requirements. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the safety clamp cylinder structure of this utility model; Figure 2 This is a hydraulic schematic diagram of the safety clamp cylinder of this utility model.

[0021] Marked in the image: 1-Cylinder head, 2-Rod chamber, 3-Piston, 4-Solenoid quick-release valve, 5-Cylinder barrel, 6-Disc spring, 7-First oil circuit, 8-Second oil circuit, 9-Third oil circuit, 10-Remote hydraulic station, 11-Oil tank. Detailed Implementation

[0022] The present invention will now be described in detail with reference to the accompanying drawings.

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model 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 only used to explain this utility model and are not intended to limit this utility model.

[0024] In this embodiment, as Figure 1 As shown, a safety clamp cylinder with an electromagnetic quick-release valve includes a cylinder barrel 5, an oil tank 11, a piston 3, and disc springs 6 and a rod chamber 2 disposed on both sides of the piston 3. The rod chamber 2 is provided with a pressure relief system, which includes a main pressure relief circuit and at least one emergency direct discharge circuit. The main pressure relief circuit is equipped with a first oil passage 7, and the main pressure relief circuit is connected to the rod chamber 2 and the remote hydraulic station 10 through the first oil passage 7. The emergency direct discharge circuit is connected to the rod chamber 2 and the oil tank 11, and is equipped with an electromagnetic quick discharge valve 4 for controlling the on and off of the emergency direct discharge circuit.

[0025] Normal operating conditions: Electromagnetic quick-release valve 4 is closed, the oil pressure in rod chamber 2 is maintained by the hydraulic station through the first oil circuit 7, piston 3 compresses disc spring 6, and brake block disengages; Emergency braking: When the electromagnetic quick-release valve 4 is opened, the oil in the rod chamber 2 is simultaneously depressurized through the first oil circuit 7 and the emergency direct discharge circuit, and the disc spring 6 pushes the piston 3 to perform braking.

[0026] The dual-circuit redundancy design makes the pressure relief paths backups for each other. Even if the main circuit fails, the emergency circuit can still independently relieve pressure, greatly improving braking reliability.

[0027] Furthermore, the emergency direct discharge circuit includes a second oil circuit 8 and a third oil circuit 9. The second oil circuit 8 connects the rod chamber 2 to the oil inlet of the electromagnetic quick discharge valve 4, and the third oil circuit 9 connects the oil outlet of the electromagnetic quick discharge valve 4 to the oil tank 11. Alternatively, the emergency direct discharge circuit includes a second oil circuit 8, which connects the rod chamber 2 to the oil inlet of the electromagnetic quick discharge valve 4, and the oil outlet of the electromagnetic quick discharge valve 4 is directly connected to the oil tank 11.

[0028] Specifically, when the electromagnetic quick-release valve 4 has a plate-type structure, the emergency direct discharge circuit is split into a second oil circuit 8 and a third oil circuit 9; The inlet of the second oil circuit 8 is connected to the rod chamber 2, and the outlet is connected to the oil inlet of the electromagnetic quick-release valve 4. The inlet of the third oil circuit 9 is connected to the outlet of the electromagnetic quick-release valve 4, and the outlet is directly connected to the oil tank 11.

[0029] The second oil circuit 8 and the third oil circuit 9 are connected by an electromagnetic quick-release valve 4 to form a complete emergency passage.

[0030] The segmented oil circuit design reduces the difficulty of processing. The dimensions of the second oil circuit 8 and the third oil circuit 9 can be optimized respectively (such as increasing the pipe diameter of the third oil circuit 9 to increase speed), avoiding flow resistance loss caused by excessively long single pipes.

[0031] Preferably, when the electromagnetic quick-release valve 4 has a tubular structure, the emergency direct discharge circuit is only provided with a second oil circuit 8. The inlet of the second oil circuit 8 is connected to the rod chamber 2, and the outlet is directly connected to the oil inlet of the electromagnetic quick-release valve 4. The oil outlet of the electromagnetic quick-release valve 4 does not need to be transferred through the third oil circuit 9. It can be directly connected to the oil tank 11 through a rigid pipe or quick connector, reducing the number of oil circuit transfer links.

[0032] This design further shortens the pressure relief path, with the oil flowing only through the second oil passage 8 and the electromagnetic quick-release valve 4, resulting in less flow resistance loss. It is suitable for drilling scenarios with extremely high requirements for braking response speed.

[0033] Furthermore, both the first oil passage 7 and the second oil passage 8 are led out from the rod cavity 2.

[0034] Specifically, the first oil passage 7 and the second oil passage 8 are embedded in the side wall of the cylinder 5; The dual oil passages are drawn from the symmetrical side walls, shortening the flow path of the oil to the rod chamber 2.

[0035] The symmetrical layout of the dual oil circuits reduces stress concentration in the cylinder barrel structure and maintains the strength of the oil cylinder.

[0036] Preferably, without relying on the cylinder head 1 to support the oil passage, a channel is directly drilled in the side wall of the cylinder 5 at the end where the rod chamber 2 is located. The inlets of the first oil passage 7 and the second oil passage 8 are both connected to the inside of the rod chamber 2, and the outlets extend to the outer wall of the cylinder 5 for connecting to external components of the main pressure relief circuit and the emergency circuit.

[0037] This solution is suitable for scenarios where the cylinder head 1 has a compact structure and cannot integrate oil circuits. It also reduces the sealing interface between the cylinder head 1 and the cylinder 5, thereby reducing the risk of leakage due to seal failure.

[0038] Furthermore, a cylinder head 1 is provided on the side of the cylinder barrel 5 where the rod chamber 2 is located, and the first oil passage 7 and the second oil passage 8 are both led out from the cylinder head 1 or the cylinder barrel 5 at one end of the rod chamber 2.

[0039] Specifically, the cylinder head 1 seals the end of the rod cavity; the first oil passage 7 and the second oil passage 8 are both led out from the inside of the cylinder head 1 through a hole, and the outlet is located on the outer surface of the cylinder head 1.

[0040] Cylinder head 1 serves as the oil passage carrier, replacing the oil flow through the cylinder wall 5.

[0041] The integrated oil circuit of cylinder head 1 simplifies the structure of cylinder barrel 5, and the cylinder head 1 assembly can be directly replaced during maintenance, reducing maintenance costs.

[0042] Furthermore, the second oil passage 8 and the third oil passage 9 are both located inside the cylinder head 1 or inside the cylinder barrel 5 at one end of the rod chamber 2; Alternatively, the second oil passage 8 may be located inside the cylinder head 1 or inside the cylinder barrel 5 at one end of the rod chamber 2, and the oil outlet of the electromagnetic quick exhaust valve 4 may be directly connected to the oil tank 11.

[0043] Specifically, when the second oil passage 8 and the third oil passage 9 are machined entirely inside the cylinder head 1, they form a closed oil passage; the electromagnetic quick exhaust valve 4 is directly screwed onto the outer surface of the cylinder head 1.

[0044] The outlet of the second oil circuit 8 and the valve inlet, and the inlet of the third oil circuit 9 and the valve outlet, are connected through the internal flow channel of the cylinder head 1. The oil circuits embedded in the cylinder head 1 eliminate some exposed pipelines, prevent leakage risks, and are suitable for installation in confined spaces.

[0045] When the first oil passage 7 and the second oil passage 8 are led out from the cylinder 5 at the rod chamber 2 end, the second oil passage 8 and the third oil passage 9 are directly machined inside the cylinder 5 to form a closed oil passage integrated with the cylinder 5; the outer wall of the cylinder 5 has a reserved interface for docking with the electromagnetic quick exhaust valve 4, and the second oil passage 8 and the third oil passage 9 are connected to the valve inlet and valve outlet respectively through the internal channel of the cylinder 5.

[0046] This design allows for a tighter integration between the oil passage and cylinder 5 structure, resulting in stronger vibration resistance and suitability for high-vibration drilling conditions.

[0047] The preferred configuration corresponds to the "emergency direct discharge circuit containing only the second oil line 8": If the oil passage is led out from the cylinder head 1, the second oil passage 8 is machined inside the cylinder head 1; if the oil passage is led out from the cylinder barrel 5 at the rod chamber 2 end, the second oil passage 8 is machined inside the cylinder barrel 5. The oil outlet of the electromagnetic quick-release valve 4 does not have a third oil circuit 9. Instead, it is directly connected to the oil tank 11 through a dedicated hard pipe or quick connector, which reduces the amount of internal oil circuit processing and lowers the manufacturing difficulty.

[0048] Furthermore, the second oil circuit 8 and the third oil circuit 9 are configured to match the installation position of the electromagnetic quick-release valve 4.

[0049] Specifically, the second oil circuit 8 and the third oil circuit 9 are configured to match the installation position of the electromagnetic quick-release valve 4: If the electromagnetic quick-release valve 4 is installed on the side of the cylinder head 1, the second oil passage 8 inside the cylinder head 1 can be set as L-shaped (first horizontally connected to the rod chamber 2, then turned at a certain angle and extended through the side wall of the cylinder head 1 to the valve inlet, the turning angle is preferably 90°), and the third oil passage 9 is also set as L-shaped (first horizontally connected to the valve outlet from the side wall of the cylinder head 1, then turned at a certain angle and extended through the top surface of the cylinder head 1 to the oil tank 11 interface, the turning angle is preferably 90°), to ensure precise connection between the oil passage and the valve interface; If the electromagnetic quick-release valve 4 is installed on the top surface of the cylinder head 1, the second oil passage 8 inside the cylinder head 1 can be set as a horizontal type (directly connected to the rod chamber 2 and the oil inlet of the electromagnetic quick-release valve 4), and the third oil passage 9 can be set as an L type (first horizontally connected to the valve outlet from the top surface of the cylinder head 1, and after turning at a certain angle, it extends through the side wall of the cylinder head 1 to connect to the oil tank 11 interface, and the turning angle is preferably 90°), to ensure that the oil passage and the valve interface are accurately connected; If the electromagnetic quick-release valve 4 is installed on the side wall of the cylinder 5, the second oil passage 8 and the third oil passage 9 inside the cylinder 5 can be set to run horizontally and directly connect to the horizontal interface of the valve to avoid increased flow resistance caused by the bend in the oil passage.

[0050] The L-type or horizontal layout design is based on the principle of "adapting to the valve body installation position and reducing flow resistance", while saving external installation space and facilitating the installation and maintenance of the electromagnetic quick-release valve 4.

[0051] Furthermore, the electromagnetic quick-release valve 4 is fixed to the outer wall of the safety clamp cylinder and is used to control the on / off state of the emergency direct discharge circuit.

[0052] Specifically, the electromagnetic quick-release valve 4 is fixed to the outer wall of the safety clamp cylinder (including the outer wall of the cylinder barrel 5, the outer wall of the cylinder head 1, and the outer end of the cylinder head 1), and is used to control the on / off of the emergency direct discharge circuit. The connection methods and adaptation advantages of different fixed positions are as follows: When fixed to the outer wall of cylinder 5: Connection methods such as clamps, welding, or bolts can be used, or other connection methods with the same or similar functions as clamp, welding, or bolt connections can be used. Clamp connections achieve rigid fixation between the valve body and cylinder 5 through the clamping force of the clamps. Fixed welding connections achieve integrated rigid fixation between the valve body and cylinder 5. Bolt connections are tightened through pre-set threaded holes on the outer wall of cylinder 5. All three connection methods ensure that there are no transitional fittings (such as hoses or adapters) between the valve body and cylinder 5, structurally eliminating joint leakage points and reducing additional resistance to oil flow.

[0053] When fixed to the outer wall or outer end of cylinder head 1: bolt connection is preferred. The outer wall and outer end of cylinder head 1 are pre-set with bolt holes and positioning structures that match the valve body. Bolt connection not only facilitates the replacement and maintenance of the valve body in the later stage (without disassembling the cylinder body), but also ensures that the oil port of the valve body is accurately aligned with the oil circuit interface integrated in the inner / outer end of cylinder head 1 through the positioning structure, avoiding sealing failure or increased flow resistance caused by interface misalignment.

[0054] Regardless of the fixing position and connection method, the electromagnetic quick-release valve 4 forms a rigid connection with the outer wall of the cylinder, eliminating the risk of loosening under the high-frequency vibration of the drilling equipment. At the same time, the valve body directly connects to the oil circuit integrated into the cylinder body, eliminating the need for the oil to flow through the traditional external hose, significantly shortening the flow path and further improving the response speed of emergency braking.

[0055] Furthermore, the outer wall of the safety clamp cylinder is provided with a valve body mounting platform. The electromagnetic quick-release valve 4 is fixed to the platform by clamps or bolts. After installation, the second oil circuit 8 is coaxially connected to the oil inlet of the valve body, and the third oil circuit 9 is coaxially connected to the oil outlet of the valve body and connects the valve body to the oil tank 11; or after installation, the second oil circuit 8 is coaxially connected to the oil port of the valve body, and the oil outlet of the valve body is directly connected to the oil tank 11.

[0056] Specifically, the outer wall of the safety clamp cylinder (outer wall of cylinder barrel 5 or outer wall of cylinder head 1) is provided with a valve body mounting platform. The surface of the platform is milled flat and pre-machined with positioning pin holes (to ensure that the valve body is installed without offset). The electromagnetic quick-release valve 4 is fixed to the platform by clamps, welding, or bolts, and there are two docking methods after installation: Emergency circuit including second and third oil lines 9: the second oil line 8 is coaxially connected to the oil inlet of the valve body, and the third oil line 9 is coaxially connected to the oil outlet of the valve body and connects the valve body and the oil tank 11; Emergency circuit containing only the second oil line 8: The second oil line 8 is coaxially connected to the valve body oil port, and the valve body oil outlet is directly connected to the oil tank 11.

[0057] Platform-based installation enables quick assembly and disassembly of the valve body, and coaxial connection avoids leakage caused by uneven wear of the sealing ring.

[0058] Furthermore, quick connectors are installed on one side of the outlet of the first oil line 7 and the third oil line 9.

[0059] Specifically, quick connectors are provided on one side of the outlet of the first oil line 7 and the third oil line 9; If it is an "emergency circuit containing only the second oil line 8", then a quick connector is installed on the pipeline connecting the oil outlet of the electromagnetic quick-release valve 4 to the oil tank 11.

[0060] The outlet of the first oil line 7 is equipped with a hydraulic station quick-change connector, and the outlet of the third oil line 9 (or the pipeline directly connected to the valve to the oil tank 11) is equipped with an oil tank 11 quick-change connector. The dual-circuit independent quick-change interface avoids accidental oil pipe connection, and the separate layout prevents operational interference.

[0061] Furthermore, the electromagnetic quick-release valve 4, in its default de-energized state, connects the second oil circuit 8 with the third oil circuit 9.

[0062] Specifically, the electromagnetic quick-release valve 4 is a normally open two-position two-way valve; by default, when power is lost, the second oil circuit 8 and the third oil circuit 9 are automatically connected.

[0063] In the event of a power outage or signal interruption, the emergency circuit automatically opens to release pressure, thus achieving failover protection.

[0064] The normally open valve safety redundancy ensures that braking is triggered in the event of any abnormal power failure, meeting the highest safety level requirements for drilling equipment.

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

Claims

1. A safety clamp cylinder with an electromagnetic quick-release valve, comprising a cylinder barrel (5), an oil tank (11), a piston (3), and disc springs (6) and rod chambers (2) disposed on both sides of the piston (3), characterized in that: The rod chamber (2) is equipped with a pressure relief system, which includes a main pressure relief circuit and at least one emergency direct discharge circuit; The main pressure relief circuit is provided with a first oil passage (7), and the main pressure relief circuit is connected to the rod chamber (2) and the remote hydraulic station (10) through the first oil passage (7); The emergency direct discharge circuit is connected to the rod chamber (2) and the oil tank (11), and is equipped with an electromagnetic quick discharge valve (4) for controlling the on and off of the emergency direct discharge circuit.

2. The safety clamp cylinder with electromagnetic quick-release valve according to claim 1, characterized in that: The emergency direct discharge circuit includes a second oil circuit (8) and a third oil circuit (9). The second oil circuit (8) connects the rod chamber (2) to the oil inlet of the electromagnetic quick discharge valve (4), and the third oil circuit (9) connects the oil outlet of the electromagnetic quick discharge valve (4) to the oil tank (11). Alternatively, the emergency direct discharge circuit may include a second oil circuit (8), which connects the rod chamber (2) to the oil inlet of the electromagnetic quick discharge valve (4), and the oil outlet of the electromagnetic quick discharge valve (4) is directly connected to the oil tank (11).

3. A safety clamp cylinder with electromagnetic quick release valve according to claim 2, characterized in that: Both the first oil passage (7) and the second oil passage (8) are led out from the rod cavity (2).

4. The safety clamp cylinder with electromagnetic quick-release valve according to claim 2, characterized in that: The cylinder (5) has a cylinder head (1) on the side where the rod chamber (2) is located. The first oil passage (7) and the second oil passage (8) are both led out from the cylinder head (1) or the cylinder (5) at one end of the rod chamber (2).

5. A safety clamp cylinder with electromagnetic quick release valve according to claim 4, characterized in that: The second oil passage (8) and the third oil passage (9) are both located inside the cylinder head (1) or inside the cylinder barrel (5) at one end of the rod chamber (2); Alternatively, the second oil passage (8) may be located inside the cylinder head (1) or inside the cylinder barrel (5) at one end of the rod chamber (2), and the oil outlet of the electromagnetic quick exhaust valve (4) may be directly connected to the oil tank (11).

6. A safety clamp cylinder with electromagnetic quick release valve according to claim 5, characterized in that: The second oil circuit (8) and the third oil circuit (9) are configured to match the installation position of the electromagnetic quick-release valve (4).

7. A safety clamp cylinder with electromagnetic quick release valve as claimed in claim 1 wherein: The electromagnetic quick-release valve (4) is fixed to the outer wall of the safety clamp cylinder and is used to control the on / off of the emergency direct discharge circuit.

8. A safety clamp cylinder with electromagnetic quick release valve as claimed in claim 1 wherein: The safety clamp cylinder has a valve body mounting platform on its outer wall. The electromagnetic quick-release valve (4) is fixed on the platform. After installation, the second oil circuit (8) is coaxially connected to the valve body oil inlet, and the third oil circuit (9) is coaxially connected to the valve body oil outlet and connects the valve body to the oil tank (11); or after installation, the second oil circuit (8) is coaxially connected to the valve body oil port, and the valve body oil outlet is directly connected to the oil tank (11).

9. A safety clamp cylinder with electromagnetic quick release valve as claimed in claim 2 wherein: Quick connectors are provided on one side of the outlet of the first oil passage (7) and the third oil passage (9).

10. A safety clamp cylinder with electromagnetic quick release valve as claimed in claim 1 wherein: The electromagnetic quick-release valve (4) is in a default de-energized state, which connects the second oil circuit (8) and the third oil circuit (9).

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