A ring forming machine's broken ring protection control system and method

Abstract

This invention provides a ring breakage protection control system and method for a ring forming machine, belonging to the field of metallurgical equipment technology. The system includes a control system, an integrated ring breakage protection valve block, a forming machine frame, a return cylinder, a moving crossbeam, a central tie rod, a main cylinder, a forming core cone, and hydraulic pipelines. The return cylinder is located at the bottom of the forming machine frame, and its upper end is connected to the moving crossbeam. The main cylinder is located inside the top of the forming machine frame. One end of the central tie rod is located below the moving crossbeam, and the other end extends upwards through the moving crossbeam, the main cylinder, and the top of the forming machine frame. The forming core cone is located at the top of the central tie rod. The return cylinder is connected to the hydraulic pipelines, and the integrated ring breakage protection valve block is located on the hydraulic pipelines. This invention uses a control method combining hydraulic valves, monitoring transmitters, and accumulator groups to protect the equipment and avoid safety accidents caused by impacts from ring breakage.

Description

Technical Field

[0001] This invention belongs to the field of metallurgical equipment technology, and specifically relates to a ring breakage protection control system and method for a ring forming machine. Background Technology

[0002] With the rapid development of space activities such as deep space exploration, the capabilities and performance of heavy-lift launch vehicles are constantly improving. Large metal rings, as core components of heavy-lift launch vehicles, require bulging to induce a certain amount of circumferential tensile deformation. This improves the ring's shape accuracy, reduces machining workload, refines grains to improve microstructure, homogenizes residual stress, significantly improves the ring's dimensional stability, and effectively enhances its overall mechanical properties. However, due to potential defects and uneven microstructure, rings may fracture during bulging, especially large rings. Ring fracture can cause serious accidents such as personnel injury and equipment damage. Therefore, it is necessary to establish a protection control system and methods for equipment in the event of ring bulging fracture to ensure equipment safety.

[0003] CN110408770B discloses a large-scale rotating centrifugal residual stress control device for ring components. The device includes a main shaft with a clamping device at its top, through which a ring component is fixed. A torque motor is located on one side of the main shaft and electrically connected to an external power source. A clutch is fixed to the output end of the torque motor. A high-speed motor is located on the other side of the main shaft. High-speed rotation generates centrifugal stress within the ring component. This centrifugal stress, combined with the initial residual stress, reaches or exceeds the material's yield strength, releasing internal stress. Furthermore, the superposition of centrifugal and residual stresses causes circumferential plastic deformation in the ring component, achieving plastic strengthening. This device effectively solves existing problems such as uneven stress during mechanical bulging and the high cost and complexity of hydraulic bulging experimental equipment, achieving uniform and controllable bulging of the ring component. However, it cannot avoid safety accidents caused by impacts resulting from ring component breakage. Summary of the Invention

[0004] To overcome the problems of potential defects and uneven structure in existing ring forming machines, which may lead to ring breakage during bulging, especially in the bulging of large rings, and the resulting serious accidents such as personal injury and equipment damage, this invention provides a ring breakage protection control system and method for ring forming machines. This invention uses a control method combining hydraulic valves, monitoring transmitters, and accumulator groups to protect the equipment and avoid safety accidents caused by the impact of ring breakage.

[0005] The technical solution provided by this invention is as follows:

[0006] A ring forming machine's ring breakage protection control system includes a control system, a ring breakage protection integrated valve block, a forming machine frame, a return cylinder, a moving crossbeam, a central tie rod, a main cylinder, a forming core cone, and hydraulic lines for the return cylinder. The return cylinder is located at the bottom of the forming machine frame, and its upper end is connected to the moving crossbeam. The main cylinder is located inside the top of the forming machine frame. One end of the central tie rod is located below the moving crossbeam, and the other end extends upward through the moving crossbeam, the main cylinder, and the top of the forming machine frame in sequence. The forming core cone is located at the top of the central tie rod. The control system is electrically connected to the ring breakage protection integrated valve block, the return cylinder, and the main cylinder.

[0007] The return cylinder is connected to the return cylinder hydraulic pipeline, and the broken ring protection integrated valve block is located on the return cylinder hydraulic pipeline.

[0008] The integrated valve block for loop breakage protection includes a loop breakage buffer control valve, an accumulator group, a safety valve, a one-way throttle valve, an electro-hydraulic directional valve, a one-way valve, and a buffer balance valve. The loop breakage buffer control valve is located between the return cylinder hydraulic line and the accumulator group, and a corresponding safety valve is provided on the accumulator group. The buffer balance valve is located between the accumulator group and the loop breakage buffer control valve, and the one-way throttle valve and the electro-hydraulic directional valve are located between the loop breakage buffer control valve and the buffer balance valve.

[0009] The energy storage group consists of multiple groups, which are arranged in parallel. Each energy storage group includes multiple energy storage units connected in series.

[0010] The expansion machine frame includes a lower beam, an upper beam, and a tie rod sleeve. The upper beam and the lower beam are connected by the tie rod sleeve, and the return cylinder is located on the lower beam.

[0011] The main cylinder is fixed to the bottom surface of the upper beam, and a main cylinder plunger is provided inside the main cylinder.

[0012] The return cylinders are multiple and symmetrically distributed on both sides of the central tie rod. The multiple return cylinders are arranged in parallel and connected to the hydraulic pipeline of the return cylinder through a connecting pipeline. The connecting pipeline is equipped with a return cylinder control valve block.

[0013] The main cylinder is a plunger-type hydraulic cylinder, and the return cylinder is a piston-type hydraulic cylinder.

[0014] The return cylinder is equipped with a return cylinder monitoring transmitter, and the main cylinder is equipped with a main cylinder monitoring transmitter. The control system is electrically connected to the return cylinder monitoring transmitter and the main cylinder monitoring transmitter, respectively.

[0015] Both the return cylinder monitoring transmitter and the master cylinder monitoring transmitter are pressure sensors.

[0016] A method for a ring forming machine's broken ring protection control system, comprising the following steps:

[0017] During the ring expansion process, the main cylinder of the expansion machine has a certain high pressure. If the ring suddenly breaks, the central tie rod loses the constraint of the ring. Under the action of the liquid pressure in the main cylinder, it pushes the moving crossbeam and the plunger of the return cylinder to move downwards quickly. The pressure of the main cylinder and the return cylinder is transmitted to the control system in real time through the main cylinder monitoring transmitter and the return cylinder monitoring transmitter. When the ring breaks, the pressure in the main cylinder drops rapidly and the pressure in the piston chamber of the return cylinder increases rapidly. When the pressure changes of the main cylinder and the return cylinder both exceed the set value, the ring breakage buffer control valve opens, and the pressure oil in the return cylinder is quickly discharged into the accumulator group through the ring breakage buffer control valve to absorb the impact and achieve buffer protection for the expansion machine.

[0018] The beneficial effects of this invention are as follows:

[0019] In this invention, when the bulging machine is bulging a ring, the system can quickly detect the sudden situation of ring breakage and promptly activate the ring breakage protection program. It quickly opens the ring breakage buffer control valve to absorb the impact energy generated by the ring breakage into the accumulator group, greatly reducing hydraulic shock, protecting the equipment from impact damage, and avoiding accidents.

[0020] The following will provide further explanation in conjunction with the accompanying drawings. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the integrated valve block for loop breakage protection according to the present invention.

[0022] Figure 2 This is a schematic diagram of the ring breakage protection control system for the ring forming machine of the present invention.

[0023] Figure 3 This is the control logic flowchart for the control system.

[0024] In the figure, the attached figures are labeled as follows:

[0025] 1. Loop break buffer control valve; 2. Accumulator group; 3. Safety valve; 4. One-way throttle valve; 5. Electro-hydraulic directional valve; 6. One-way valve; 7. Buffer balance valve; 8. Return cylinder control valve block; 9. Return cylinder monitoring transmitter; 10. Return cylinder; 11. Lower beam; 12. Moving crossbeam; 13. Master cylinder plunger; 14. Center tie rod; 15. Master cylinder; 16. Tie rod sleeve; 17. Upper beam; 18. Expanded core cone; 19. Master cylinder monitoring transmitter;

[0026] P1, hydraulic line for the return cylinder; P2, hydraulic line for the main cylinder. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0029] Example 1:

[0030] To overcome the problems of existing ring components, such as potential defects and uneven microstructure, which can lead to breakage during bulging, especially in the bulging of large rings, and the resulting serious accidents such as personal injury and equipment damage, this invention provides... Figures 1-3 The invention discloses a ring forming machine ring breakage protection control system and method. The invention uses a control method combining hydraulic valves, monitoring transmitters and accumulator groups to protect the equipment and avoid safety accidents caused by the impact of ring breakage.

[0031] A ring forming machine's broken-loop protection control system includes a control system, a broken-loop protection integrated valve block, a forming machine frame, a return cylinder 10, a moving crossbeam 12, a central tie rod 14, a main cylinder 15, a forming core cone 18, and a return cylinder hydraulic line P1. The return cylinder 10 is located at the bottom of the forming machine frame, and its upper end is connected to the moving crossbeam 12. The main cylinder 15 is located inside the top of the forming machine frame. One end of the central tie rod 14 is located below the moving crossbeam 12, and the other end extends upward through the moving crossbeam 12, the main cylinder 15, and the top of the forming machine frame. The forming core cone 18 is located at the top of the central tie rod 14. The control system is electrically connected to the broken-loop protection integrated valve block, the return cylinder 10, and the main cylinder 15. The return cylinder 10 is connected to the return cylinder hydraulic line P1, and the broken-loop protection integrated valve block is located on the return cylinder hydraulic line P1.

[0032] Figure 1 In the text, both "external high-pressure oil source" and "external oil source" refer to external oil sources, both used for control. Figure 1 The operation of the hydraulic valve is achieved through two sources: a high-pressure oil source and a medium-pressure oil source. The specific pressure values ​​are set according to the entire main control system and belong to existing mature technology, so they will not be further explained in this invention.

[0033] When the bulging machine is bulging a ring, this system can quickly detect the sudden situation of ring breakage and promptly activate the ring breakage protection program, quickly opening the ring breakage buffer control valve 1 to absorb the impact energy generated by the ring breakage into the accumulator group 2. Figure 1 The hydraulic line P1 of the return cylinder with the middle oil inlet is connected to Figure 2 The return cylinder hydraulic line is connected to outlet P1, and the two belong to the same pipeline, but are distributed in different diagrams.

[0034] like Figure 1 and Figure 2 As shown, the present invention can quickly discharge the liquid in the return cylinder 10 into the accumulator group 2 through the ring-breaking buffer control valve 1. The accumulator group 2 absorbs a large amount of impact energy and establishes a pressure support stabilization system in the piston chambers of the four return cylinders 10, preventing the main cylinder plunger 13, along with the central tie rod 14 and the expanded core cone 18, from impacting and damaging the equipment downwards, thereby achieving protection for the main equipment and system.

[0035] This invention can significantly reduce hydraulic shock, protect equipment from impact damage, and prevent accidents.

[0036] This invention uses a single-cylinder pull-down bulging machine as the main unit and proposes a ring breakage protection control system and method for a ring bulging machine. This invention can also be used for other hydraulically driven ring bulging machines with different structural forms.

[0037] Example 2:

[0038] Based on Embodiment 1, in this embodiment, preferably, the integrated valve block for loop breakage protection includes a loop breakage buffer control valve 1, an accumulator group 2, a safety valve 3, a one-way throttle valve 4, an electro-hydraulic directional valve 5, a one-way valve 6, and a buffer balance valve 7; the loop breakage buffer control valve 1 is located between the hydraulic pipeline P1 of the return cylinder and the accumulator group 2, and the safety valve 3 is correspondingly provided on the accumulator group 2; the buffer balance valve 7 is located between the accumulator group 2 and the loop breakage buffer control valve 1, and the one-way throttle valve 4 and the electro-hydraulic directional valve 5 are located between the loop breakage buffer control valve 1 and the buffer balance valve 7.

[0039] Preferably, the energy storage group 2 is a plurality of groups, which are arranged in parallel, and each energy storage group 2 includes a plurality of energy storage units connected in series.

[0040] In this invention, such as Figure 1As shown, by setting the pressure value of the buffer balance valve 7, the loop breakage protection control system can maintain a certain pressure, providing a certain support pressure for the return cylinder 10, and preventing the return cylinder 10 from losing its support pressure after the loop breakage buffer control valve 1 opens. Due to the existence of system leakage, the loop breakage protection control system will experience pressure drop if left idle for a long time, and leakage will also occur if the accumulator group 2 is stored for too long, resulting in pressure drop. Therefore, the external oil source periodically replenishes the pressure of the accumulator group 2 through a combination of one-way valve 6, electro-hydraulic reversing valve 5, and one-way throttle valve 4, so that the loop breakage protection control system maintains a certain basic pressure value to meet the loop breakage protection conditions.

[0041] Preferably, the expansion machine frame includes a lower beam 11, an upper beam 17, and a tie rod sleeve 16. The upper beam 17 and the lower beam 11 are connected by the tie rod sleeve 16, and the return cylinder 10 is disposed on the lower beam 11.

[0042] Preferably, the main cylinder 15 is fixed on the bottom surface of the upper beam 17, and the main cylinder 15 is provided with a main cylinder plunger 13.

[0043] Preferably, there are multiple return cylinders 10, symmetrically distributed on both sides of the central tie rod 14. After the multiple return cylinders 10 are arranged in parallel, they are connected to the return cylinder hydraulic pipeline P1 through a connecting pipeline. The connecting pipeline is equipped with a return cylinder control valve block 8.

[0044] Preferably, the main cylinder 15 is a plunger-type hydraulic cylinder, and the return cylinder 10 is a piston-type hydraulic cylinder.

[0045] Preferably, the return cylinder 10 is equipped with a return cylinder monitoring transmitter 9, and the main cylinder 15 is equipped with a main cylinder monitoring transmitter 19. The control system is electrically connected to the return cylinder monitoring transmitter 9 and the main cylinder monitoring transmitter 19 respectively.

[0046] Preferably, both the return cylinder monitoring transmitter 9 and the master cylinder monitoring transmitter 19 are pressure sensors.

[0047] In this invention, monitoring transmitters are installed in the hydraulic system pipelines near the piston chambers of the main cylinder 15 and the four return cylinders 10. When a loop breakage occurs, pressure changes can be quickly detected, providing a basis for judgment for the loop breakage protection control system. When the control logic program of the control system determines that the loop component has broken, the control system activates the loop breakage protection control system, the loop breakage buffer control valve 1 opens, and the impact energy is absorbed into the accumulator group 2, thereby achieving safety protection for the expansion machine system and equipment.

[0048] The specific usage process of this invention is as follows:

[0049] The expansion machine frame is composed of an upper beam 17, a lower beam 11 and a tie rod pressure sleeve 16. The moving crossbeam 12 is driven by the main cylinder 15 and four return cylinders 10 of equal diameter to move up and down or stop between the upper beam 17 and the lower beam 11.

[0050] When the expansion machine is working normally, the main cylinder 15 is fed with hydraulic fluid through the main cylinder hydraulic line P2, causing the moving crossbeam 12 to move downwards. A return cylinder control valve block 8 is installed on the connecting pipeline between the four return cylinders 10 and the return cylinder hydraulic line P1. This valve block controls the fluid inlet, outlet, and balancing of the return cylinders 10, enabling functions such as rapid descent, slow descent, self-weight balancing, and fluid replenishment. Simultaneously, the return cylinder hydraulic line P1 connects to the integrated valve block for loop breakage protection, directly controlling the fluid flow. Figure 2 The return cylinder hydraulic line P1 is connected to Figure 1 The return cylinder hydraulic line can be connected at point P1. A break-loop buffer control valve 1 is installed on the integrated valve block for break-loop protection. Figure 1 All the hydraulic valves involved are mounted on the integrated valve block for broken loop protection. The integrated valve block for broken loop protection is located on... Figure 2 On the return cylinder hydraulic line P1.

[0051] In this invention, the loop-breaking buffer control valve 1 is a high-frequency response proportional flow control valve that can respond quickly under the electrical signal control of the control system. A main cylinder monitoring transmitter 19 is installed on the oil line near the inlet of the main cylinder 15, and a return cylinder monitoring transmitter 9 is installed on the oil line near the return cylinder 10. The main bodies of the two monitoring transmitters adopt high-performance pressure sensors, which can monitor the pressure and pressure changes in the piston chambers of the main cylinder 15 and the return cylinder 10 in real time.

[0052] In this invention, during the ring forming process, the main cylinder 15 experiences a certain high pressure. If the ring suddenly breaks, the central tie rod 14 loses the constraint force of the ring, disrupting the force balance of the main unit of the forming machine. Under the hydraulic pressure of the main cylinder 15, the moving crossbeam 12 and the piston of the return cylinder 10 move rapidly downwards. The enormous moving mass and rapid hydraulic pressure change instantly generate a powerful impact on the hydraulic system and the main unit of the equipment. The pressure of the main cylinder 15 and the return cylinder 10 is transmitted to the control system in real time through the main cylinder monitoring transmitter 19 and the return cylinder monitoring transmitter 9. When the ring breaks, the pressure of the main cylinder 15 drops rapidly, and the pressure in the piston chamber of the return cylinder 10 increases rapidly. When the pressure change of the return cylinder 10 exceeds the set value, the ring breakage buffer control valve 1 opens, and the pressurized oil in the return cylinder 10 is quickly discharged into the accumulator group 2 through the ring breakage buffer control valve 1 to absorb the impact and achieve buffer protection for the equipment. The specific control logic flowchart is shown below. Figure 3 .

[0053] Example 3:

[0054] Based on Embodiment 1 or 2, this embodiment preferably provides a ring breakage protection control method for a ring forming machine, the specific steps of which are as follows:

[0055] When the ring is being expanded, the main cylinder 15 has a certain high pressure. If the ring suddenly breaks, the central tie rod 14 loses the constraint of the ring. Under the action of the liquid pressure in the main cylinder 15, it pushes the piston of the moving crossbeam 12 and the return cylinder 10 to move downward quickly. The pressure of the main cylinder 15 and the return cylinder 10 is transmitted to the control system in real time through the main cylinder monitoring transmitter 19 and the return cylinder monitoring transmitter 9. When the ring breaks, the pressure of the main cylinder 15 drops rapidly and the pressure of the piston chamber of the return cylinder 10 increases rapidly. When the pressure changes of the main cylinder 15 and the return cylinder 10 both exceed the set value, the ring breakage buffer control valve 1 opens, and the pressure oil in the return cylinder 10 is quickly discharged into the accumulator group 2 through the ring breakage buffer control valve 1 to absorb the impact and achieve buffer protection for the expansion machine.

[0056] like Figure 3 As shown, in practical applications, to prevent misjudgment by the protection program from affecting the normal operation of the equipment, the control logic program is set as follows: when the pressure value of the main cylinder 15 is less than 5MPa (including 5MPa), or the pressure value of the return cylinder 10 fluctuates less than 2MPa (including 2MPa) within a 10ms time range, the pressure fluctuation is small, and the main program runs normally; only when the pressure value of the main cylinder 15 is greater than 5MPa and the pressure value of the return cylinder 10 fluctuates more than 2MPa within a 10ms time range simultaneously, the control system sends a command to quickly open the loop break buffer control valve 1. The loop break buffer control valve 1 is a high-frequency response proportional servo valve, and the time from receiving the command to opening is controlled within 12ms. The loop break buffer control valve 1 responds quickly in a short time to achieve a large flow rate, and the pressure oil in the return cylinder 10 is quickly discharged into the accumulator group 2, thereby absorbing a large amount of impact energy into the accumulator group 2. The two safety valves 3 are used to protect the pressure safety of the loop break buffer system.

[0057] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0058] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0059] The examples above are merely illustrative of the present invention and do not constitute a limitation on the scope of protection of the present invention. All designs that are the same as or similar to the present invention fall within the scope of protection of the present invention. Device structures and method steps not described in detail in this invention are prior art and will not be further described in this invention.

Claims

1. A ring breakage protection control system for a ring forming machine, characterized in that: The system includes a control system, a loop breakage protection integrated valve block, a forming machine frame, a return cylinder (10), a moving crossbeam (12), a central tie rod (14), a main cylinder (15), a forming core cone (18), and a return cylinder hydraulic pipeline (P1). The return cylinder (10) is located at the bottom of the forming machine frame, and its upper end is connected to the moving crossbeam (12). The main cylinder (15) is located inside the top of the forming machine frame. One end of the central tie rod (14) is located below the moving crossbeam (12), and the other end extends upward through the moving crossbeam (12), the main cylinder (15), and the top of the forming machine frame. The forming core cone (18) is located at the top of the central tie rod (14). The control system is electrically connected to the loop breakage protection integrated valve block, the return cylinder (10), and the main cylinder (15). The return cylinder (10) is connected to the return cylinder hydraulic line (P1), and the broken ring protection integrated valve block is installed on the return cylinder hydraulic line (P1); The integrated valve block for loop break protection includes a loop break buffer control valve (1), an accumulator group (2), a safety valve (3), a one-way throttle valve (4), an electro-hydraulic directional valve (5), a one-way valve (6), and a buffer balance valve (7). The loop break buffer control valve (1) is located between the return cylinder hydraulic line (P1) and the accumulator group (2), and the accumulator group (2) is equipped with a corresponding safety valve (3). The buffer balance valve (7) is located between the accumulator group (2) and the loop break buffer control valve (1), and the one-way throttle valve (4) and the electro-hydraulic directional valve (5) are located between the loop break buffer control valve (1) and the buffer balance valve (7). The expansion machine frame includes a lower beam (11), an upper beam (17) and a tie rod sleeve (16). The upper beam (17) and the lower beam (11) are connected by the tie rod sleeve (16). The return cylinder (10) is located on the lower beam (11). The return cylinder (10) is equipped with a return cylinder monitoring transmitter (9), and the main cylinder (15) is equipped with a main cylinder monitoring transmitter (19). The control system is electrically connected to the return cylinder monitoring transmitter (9) and the main cylinder monitoring transmitter (19) respectively.

2. The ring breakage protection control system for a ring forming machine according to claim 1, characterized in that: The energy storage group (2) is a multi-group, and the multi-group energy storage group (2) is arranged in parallel. Each energy storage group (2) includes multiple energy storage units connected in series.

3. The ring breakage protection control system for a ring forming machine according to claim 1, characterized in that: The main cylinder (15) is fixed on the bottom surface of the upper beam (17), and the main cylinder (15) is provided with a main cylinder plunger (13).

4. The ring breakage protection control system for a ring forming machine according to claim 1, characterized in that: The return cylinders (10) are multiple and symmetrically distributed on both sides of the central tie rod (14). After the multiple return cylinders (10) are arranged in parallel, they are connected to the return cylinder hydraulic pipeline (P1) through a connecting pipeline. The connecting pipeline is equipped with a return cylinder control valve block (8).

5. The ring breakage protection control system for a ring forming machine according to claim 1, characterized in that: The main cylinder (15) is a plunger-type hydraulic cylinder, and the return cylinder (10) is a piston-type hydraulic cylinder.

6. The ring breakage protection control system for a ring forming machine according to claim 1, characterized in that: Both the return cylinder monitoring transmitter (9) and the master cylinder monitoring transmitter (19) are pressure sensors.

7. A method for a ring forming machine's ring breakage protection control system according to any one of claims 1-6, characterized in that: The specific steps are as follows: When the expansion machine is expanding the ring, the main cylinder (15) has a certain high pressure. If the ring breaks suddenly, the central tie rod (14) loses the constraint of the ring. Under the action of the liquid pressure of the main cylinder (15), it pushes the moving crossbeam (12) and the plunger of the return cylinder (10) to move downward quickly. The pressure of the main cylinder (15) and the return cylinder (10) is transmitted to the control system in real time through the main cylinder monitoring transmitter (19) and the return cylinder monitoring transmitter (9). When the ring breaks, the pressure of the main cylinder (15) drops rapidly and the pressure of the piston chamber of the return cylinder (10) increases rapidly. When the pressure changes of the main cylinder (15) and the return cylinder (10) exceed the set value, the ring breakage buffer control valve (1) opens and the pressure oil in the return cylinder (10) is quickly discharged into the accumulator group (2) through the ring breakage buffer control valve (1) to absorb the impact energy and realize the buffer protection of the expansion machine equipment.

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