High-temperature-resistant hydraulic oil cylinder for emergency rescue

Abstract

The application discloses an emergency rescue high-temperature-resistant hydraulic oil cylinder, which comprises a hydraulic cylinder barrel, the outer wall of the hydraulic cylinder barrel is coaxially sleeved with a cooling water jacket, the center of the hydraulic cylinder barrel is coaxially penetrated with a lockable piston rod, one end of the hydraulic cylinder barrel is connected with a multifunctional tail seat, the other end of the hydraulic cylinder barrel is connected with a spring seat, the connecting place of the lockable piston rod and the multifunctional tail seat is sequentially provided with a guide sleeve and a piston sealing assembly, the other end of the lockable piston rod penetrates through the spring seat and extends out from the first end of the hydraulic cylinder barrel, and the connecting place of the lockable piston rod and the spring seat is provided with a mechanical locking device. The application solves the problems of the conventional hydraulic cylinder, such as simple cooling structure design, easy damage of the hydraulic cylinder seal in a high-temperature environment, unplanned maintenance of the hydraulic cylinder, influence on operation efficiency, increased possibility of leakage due to more self-locking oil paths when the hydraulic cylinder is locked by a hydraulic lock, and inconvenience in maintenance and use.

Description

Technical Field

[0001] This invention belongs to the field of drilling operation technology and relates to an emergency rescue high-temperature resistant hydraulic cylinder. Background Technology

[0002] In drilling operations, handling blowouts primarily revolves around the crucial objective of restoring control of the flow at the wellhead. During a blowout and fire, the flame column typically reaches heights of over 50 meters, and in very large wells, it can reach 100 meters. The surface temperature of the flame column generally reaches 1500℃, with strong thermal radiation, making it impossible for rescue personnel to approach the wellhead for installation work. Close-range rescue operations are only possible with strict protective measures, but significant safety hazards remain. Without water or shelter, the safety of rescue personnel is difficult to guarantee. The harsh rescue environment and working conditions make rescue operations extremely difficult. Some well sites have limited space and narrow areas, making it difficult for rescue equipment to enter, and the limited operating space further hinders the work of rescue personnel. Therefore, the use of high-temperature resistant emergency rescue hydraulic cylinders for efficient and stable operation at high temperatures for extended periods is extremely necessary.

[0003] Emergency rescue high-temperature resistant hydraulic cylinders have very strict process requirements, requiring stable internal structure, sensitive action, rapid response, high speed, long service life, and no leakage. However, existing emergency rescue high-temperature resistant hydraulic cylinders have simple cooling structure designs, making the seals easily damaged in high-temperature environments, often resulting in unplanned maintenance. Specifically, the main defects of domestic emergency rescue hydraulic cylinders are: (1) the piston and piston rod seals of emergency rescue high-temperature resistant hydraulic cylinders are severely damaged in high-temperature environments, often resulting in internal and external oil leakage accidents; (2) the cooling structure of the hydraulic cylinder is simple, and the cooling effect is poor. Due to the above reasons, the current emergency rescue high-temperature resistant hydraulic cylinders cannot meet production needs, causing frequent unplanned maintenance accidents and seriously affecting production efficiency.

[0004] According to operational requirements, the piston rod of a high-temperature resistant hydraulic cylinder used in emergency rescue needs to maintain its position for a period of time after it has moved to a certain position or stopped working. The piston rod's position often changes under external loads, gravity, or other loads, necessitating position locking by the hydraulic cylinder. To achieve self-locking, hydraulic locks are often used. However, during prolonged operation, these locks can leak, leading to system failure and posing a significant safety hazard to emergency rescue operations.

[0005] In emergency rescue high-temperature hydraulic cylinders, the internal piston rod is relatively long during operation, and the cylinder's own weight cannot be ignored. When the piston rod reaches its limit position, it is prone to jamming, resulting in severe scoring of the cylinder's inner wall and significantly reducing its service life. Summary of the Invention

[0006] The purpose of this invention is to provide a high-temperature resistant hydraulic cylinder for emergency rescue, which solves the problems of traditional hydraulic cylinders, which are prone to seal damage in high-temperature environments due to their simple cooling structure design, resulting in unplanned maintenance and affecting work efficiency; and the increased possibility of leakage due to the numerous self-locking oil circuits when using hydraulic locks to lock the hydraulic cylinder, causing inconvenience in maintenance and use.

[0007] The technical solution adopted in this invention is an emergency rescue high-temperature resistant hydraulic cylinder, including a hydraulic cylinder barrel, a cooling water jacket coaxially sleeved on the outer wall of the hydraulic cylinder barrel, a lockable piston rod coaxially sleeved at the center of the hydraulic cylinder barrel, a multi-functional tailstock connected to one end of the hydraulic cylinder barrel, a spring seat connected to the other end of the hydraulic cylinder barrel, a guide sleeve and a piston sealing assembly sequentially provided at the connection between one end of the lockable piston rod and the multi-functional tailstock; the other end of the lockable piston rod extends from the front end of the hydraulic cylinder barrel through the spring seat; a mechanical locking device is provided at the connection between the lockable piston rod and the spring seat; the lockable piston rod is connected to the multi-functional tailstock through a rod cavity oil inlet pipe.

[0008] The invention is further characterized by:

[0009] The multi-functional tailstock has a valve core working channel. One end of the valve core working channel has a push rod movement channel and a rod cavity oil inlet connector I installation channel in sequence. The other end of the valve core working channel has a plug installation channel. The middle of the valve core working channel is connected to one end of the plug cavity oil inlet channel I. The other end of the plug cavity oil inlet channel I is connected to the plug cavity oil inlet connector installation channel. The valve core working channel is set perpendicular to the plug cavity oil inlet channel I.

[0010] The hydraulic locking device includes a valve core installed in the valve core working channel, one end of a spring pressing against the valve core, and the other end of the spring being pressed into the valve core working channel by a plug. A push rod is also provided in the valve core working channel, with one end of the push rod located close to the valve core and the other end of the push rod connected to the rod cavity oil inlet pipe.

[0011] The rod chamber oil inlet line includes a rod chamber oil inlet straight pipe. One end of the rod chamber oil inlet straight pipe is connected to the push rod through rod chamber oil inlet connector I, and the other end of the rod chamber oil inlet straight pipe is connected to the lockable piston rod.

[0012] The cooling water jacket has a double spiral water groove arranged in a cross pattern. The outer wall of the cooling water jacket is coated with a heat insulation coating. The cooling sleeve is coaxially arranged inside the cooling water jacket. Water inlet connector III and water inlet connector II are respectively provided on opposite sides of one end of the cooling water jacket, and water inlet connector I is respectively provided on opposite sides of the other end of the cooling water jacket. Sealing rings are installed at both ends of the cooling water jacket 1. A locking nut is provided at the head connection between the cooling water jacket and the hydraulic cylinder barrel, and a welding flange is provided at the tail connection between the cooling water jacket and the hydraulic cylinder barrel.

[0013] The lockable piston rod includes a piston rod, one end of which is connected to an ear ring, and the piston rod and the ear ring are connected by threads. The piston rod has a horizontal flow channel and a vertical flow channel inside. The horizontal flow channel is a blind hole and a through hole. The horizontal flow channel and the vertical flow channel are connected. Piston rod plugs are provided at both ends of the vertical flow channel where they pass through the edge of the piston rod.

[0014] The mechanical locking device includes a locking spring, a wedge-shaped sliding locking ring, and a wedge-shaped sliding locking ring sequentially sleeved on the piston rod. A limit hole is opened in the inner cavity of the spring seat. The wedge-shaped sliding locking ring and the wedge-shaped fixed locking ring are located on the side of the limit hole closer to the hydraulic cylinder end cover. The hydraulic cylinder end cover is located at the end of the spring seat away from the hydraulic cylinder barrel. The locking spring is located on the other side of the limit hole, and is tightly attached to the inner cavity of the spring seat. An oil inlet connector for the mechanical locking device is installed on the outer wall of the spring seat at the gap between the wedge-shaped sliding locking ring and the wedge-shaped fixed locking ring.

[0015] The beneficial effects of this invention are that the emergency rescue high-temperature resistant hydraulic cylinder provided by this invention has good high-temperature resistance, reduces the frequency of replacing hydraulic cylinder seals, and improves work efficiency. The hydraulic cylinder operates reliably without leakage, reducing the risks of emergency operations. Attached Figure Description

[0016] Figure 1 This is a front view of the high-temperature resistant hydraulic cylinder for emergency rescue according to the present invention;

[0017] Figure 2 This is a top view of the high-temperature resistant hydraulic cylinder for emergency rescue according to the present invention;

[0018] Figure 3 This is a cross-sectional view (AA) of the high-temperature resistant hydraulic cylinder for emergency rescue according to the present invention;

[0019] Figure 4 This is a sectional view of the high-temperature resistant hydraulic cylinder for emergency rescue according to the present invention.

[0020] Figure 5 This is a schematic diagram of the structure of the cooling water jacket for the high-temperature resistant hydraulic cylinder for emergency rescue according to the present invention;

[0021] Figure 6 This is a schematic diagram of the installation of the cooling water jacket and cylinder barrel of the high-temperature resistant hydraulic cylinder for emergency rescue according to the present invention;

[0022] Figure 7 This is an installation diagram of the high-temperature resistant hydraulic cylinder mechanical locking device for emergency rescue according to the present invention;

[0023] Figure 8 This is a schematic diagram of the installation of the emergency rescue high-temperature resistant hydraulic cylinder hydraulic locking device and the multi-functional tailstock of the present invention;

[0024] Figure 9 This is an AA cross-sectional view of the multi-functional tailstock of the high-temperature resistant hydraulic cylinder for emergency rescue of the present invention;

[0025] Figure 10 This is a schematic diagram of the lockable piston rod of the high-temperature resistant hydraulic cylinder for emergency rescue according to the present invention;

[0026] Figure 11 This is a schematic diagram of the structure of the oil inlet pipeline of the rod cavity of the emergency rescue high-temperature resistant hydraulic cylinder of the present invention;

[0027] Figure 12 This is a schematic diagram of the structure of the oil inlet connector I of the high-temperature resistant hydraulic cylinder rod cavity for emergency rescue according to the present invention.

[0028] In the diagram, 1. Cooling water jacket, 1-1. Heat insulation coating, 1-2. Cooling sleeve, 1-3. Spiral water groove, 1-4. Water inlet connector I, 1-5. Sealing ring, 1-6. Water inlet connector II, 1-7. Water inlet connector III, 1-8. Wedge-shaped clamping ring, 1-9. Locking nut, 1-10. Welding flange, 1-11. Locating screw;

[0029] 2. Spring seat;

[0030] 3. Lockable piston rod; 3-1. Earring; 3-2. Piston rod; 3-3. Horizontal flow channel of piston rod; 3-4. Vertical flow channel of piston rod; 3-5. Piston rod plug; 3-6. Piston rod water inlet connector I; 3-7. Piston rod water inlet connector II;

[0031] 4. Rod cavity oil inlet pipeline, 4-1. Rod cavity oil inlet connector I, 4-1-1. Rod cavity oil inlet, 4-1-2. Connecting connector to multi-functional tailstock, 4-1-3. Connecting connector to rod cavity oil inlet straight pipe;

[0032] 4-2. Rod cavity oil inlet straight pipe; 4-3. Rod cavity oil inlet connector II;

[0033] 5. Multifunctional tailstock, 5-1. Oil inlet connector installation channel for plug cavity, 5-2. Oil inlet channel I for plug cavity, 5-3. Oil inlet channel II for plug cavity, 5-4. Push rod movement channel, 5-5. Oil inlet connector I installation channel for rod cavity, 5-6. Valve core working channel, 5-7. Plug installation channel;

[0034] 6. Oil inlet connector for the plug cavity; 7. Hydraulic cylinder end cap;

[0035] 8. Mechanical locking device; 8-1. Locking spring; 8-2. Vent hole; 8-3. Oil inlet connector for mechanical locking device; 8-4. Wedge-shaped fixed locking ring; 8-5. Wedge-shaped sliding locking ring;

[0036] 9. Hydraulic cylinder barrel; 10. Guide sleeve; 11. Piston seal assembly;

[0037] 12. Hydraulic locking device, 12-1. Plug, 12-2. Spring, 12-3. Valve core, 12-4. Push rod. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0039] This invention relates to an emergency rescue high-temperature resistant hydraulic cylinder, such as... Figure 1 , 2 As shown, it includes a cooling water jacket 1, a spring seat 2, a lockable piston rod 3, an oil inlet pipe for the rod chamber 4, and a multi-functional tailstock 5;

[0040] The hydraulic cylinder barrel 9 and the multi-functional tailstock 5 adopt a welded structure and are processed after welding, which can ensure the strength of the cylinder body and the dimensional accuracy of the inner cylinder.

[0041] The multi-functional tailstock 5 has internal flow channels with different functions. The rod cavity oil inlet pipe 4 and the plug cavity oil inlet connector 6 are led out from the internal flow channels of the multi-functional tailstock 5. The cooling water jacket 1 is fastened to the outer wall of the hydraulic cylinder barrel 9. The multi-functional tailstock 5 has internal flow channels with different functions, which can realize the interlocking of the hydraulic cylinder circuit. The tailstock integrates the oil inlet and return interfaces of the hydraulic cylinder piston cavity and rod cavity.

[0042] like Figure 3 , Figure 8 , Figure 9 As shown, the multi-functional tailstock 5 has a plug cavity oil inlet connector installation channel 5-1, a plug cavity oil inlet channel I 5-2, a plug cavity oil inlet channel II 5-3, a push rod movement channel 5-4, a rod cavity oil inlet connector I installation channel 5-5, a valve core working channel 5-6, and a plug installation channel 5-7.

[0043] Install valve core 12-3 and spring 12-2 along valve core working channel 5-6;

[0044] like Figure 12 As shown, the rod cavity oil inlet connector I4-1 includes a rod cavity oil inlet 4-1-1, a multi-functional tailstock connector 4-1-2, and a rod cavity oil inlet straight pipe connector 4-1-3;

[0045] When hydraulic oil enters the hydraulic cylinder plug chamber inlet connector 6, the hydraulic oil passes through plug chamber inlet channel I5-2, pushing the valve core 12-3 towards the plug 12-1. Plug chamber inlet channel I5-2 is connected to plug chamber inlet channel II5-3, allowing oil to enter the plug chamber of the hydraulic cylinder's locking piston rod 3, pushing the locking piston rod 3 forward. The oil in the rod chamber of the hydraulic cylinder's locking piston rod 3 returns to the oil tank via the rod chamber inlet pipe 4.

[0046] Similarly, when oil enters the rod chamber of the lockable piston rod 3 of the hydraulic cylinder, the oil enters through the rod chamber inlet 4-1-1 at the rod chamber inlet pipe 4 and splits into two paths. One path passes through the connecting joint 4-1-3 to the rod chamber inlet straight pipe 4-2 and reaches the rod chamber of the lockable piston rod 3 of the hydraulic cylinder. The other path passes through the connecting joint 4-1-2 to the multi-functional tailstock and reaches the push rod movement channel 5-4, pushing the push rod 12-4 to move along the push rod movement channel 5-4 towards the plug 12-1. The plug chamber inlet channel I 5-2 and the plug chamber inlet channel II 5-3 are connected, and the oil in the lockable piston rod 3 returns to the oil tank through the plug chamber inlet joint 6.

[0047] like Figure 11 As shown, one end of the rod cavity oil inlet straight pipe 4-2 is connected to the rod cavity oil inlet connector I4-1, and the other end of the rod cavity oil inlet straight pipe 4-2 is connected to the rod cavity oil inlet connector II4-3.

[0048] When oil no longer enters through the rod cavity inlet 4-1-1 at the rod cavity inlet connector I 4-1, hydraulic oil no longer enters the push rod movement channel 5-4 through the straight pipe connection 4-1-3, preventing the push rod 12-4 from moving towards the plug 12-1. Under the action of the spring 12-2, the valve core 12-3 cannot connect with the plug cavity inlet channel I 5-2 and the plug cavity inlet channel II 5-3. The hydraulic cylinder can lock the oil in the piston rod 3 plug cavity, preventing it from returning to the oil tank. At this time, the hydraulic cylinder can lock the piston rod 3 in a locked state upon return.

[0049] like Figure 5 , Figure 6 As shown, a spiral water groove 1-3 is formed inside the cooling water jacket 1. The cross-sectional shape of the spiral water groove 1-3 is "U"-shaped, with a double spiral channel. A 50mm heat insulation coating 1-1 is applied to the outer wall of the cooling water jacket 1 to reduce the transfer of high ambient heat to the hydraulic cylinder. Water inlet connectors I1-4, II1-6, and III1-7 are connected to the spiral water groove 1-3. A cooling sleeve 1-2 is coaxially arranged inside the cooling water jacket 1-1. To achieve circulation of cooling water throughout the spiral water groove 1-3, water inlet connectors I1-4 and III1-7 are located near the tail and head ends of the cooling water jacket 1. Cooling water is injected along water inlet connector II1-6. After the cooling water is filled, water inlet connector II1-6 is sealed. The cooling water in the circulating spiral water groove 1-3 carries away the heat generated by the hydraulic cylinder. Sealing rings 1-5 are installed at both ends of the cooling water jacket 1. Welding flanges 1-10 are welded to the tail of the hydraulic cylinder barrel 9. Welding flanges 1-10 and cooling water jacket 10 are connected by positioning screws 1-11.

[0050] Rotate the cooling water jacket 1 to properly position the water inlet connectors I1-4, II1-6, and III1-7. Then, insert wedge-shaped clamping rings 1-8 and locking nuts 1-9 at both ends of the cooling water jacket 1 along the cylinder barrel 9 of the hydraulic cylinder. The wedge-shaped clamping rings 1-8 are inserted along the wedge-shaped chamfer of the inner hole of the cooling water jacket 1. Rotate the locking nuts 1-9, which will cause the wedge-shaped clamping rings 1-8 to move, pressing the cooling water jacket 1 and thus securing it to the outer wall of the hydraulic cylinder barrel 9.

[0051] like Figure 10 As shown, the lockable piston rod 3 includes an ear ring 3-1 and a piston rod 3-2; the external thread of the ear ring 3-1 engages with the internal thread of the piston rod 3-2, and the two are fastened together to drive the load to reciprocate; the piston rod 3-2 has a horizontal flow channel 3-3 and a vertical flow channel 3-4 inside, the horizontal flow channel 3-3 is a blind hole of a certain depth, and the horizontal flow channel 3-4 is a through hole;

[0052] The horizontal flow channel 3-3 and the vertical flow channel 3-4 of the piston rod are connected; piston rod plugs 3-5 are respectively provided at the two ends of the vertical flow channel 3-4 of the piston rod where they pass through the edge of the piston rod 3-2.

[0053] Piston rod water inlet connector I3-6 and piston rod water inlet connector II3-7 are led out from near the connection between lug 3-1 and piston rod 3-2; piston rod water inlet connector I3-6 and piston rod water inlet connector II3-7 are connected to the horizontal flow channel 3-3 of the piston rod. Cooling water is injected along piston rod water inlet connector I3-6 or piston rod water inlet connector II3-7, circulating the cooling water in the horizontal flow channel 3-3 and the vertical flow channel 3-4 of the piston rod, carrying away the heat transferred from the external environment to the lockable piston rod 3 and the heat generated by the lockable piston rod 3 during operation, avoiding damage to the internal seals of the hydraulic cylinder under high temperature environment, thus preventing unplanned maintenance and improving production efficiency.

[0054] like Figure 4 , Figure 7 As shown, the spring seat 2 is equipped with a mechanical locking device 8, which includes a locking spring 8-1, a wedge-shaped fixed locking ring 8-4 and a wedge-shaped sliding locking ring 8-5. The spring seat 2 is provided with an exhaust hole 8-2 to facilitate the movement of the wedge-shaped sliding locking ring 8-5.

[0055] The wedge-shaped sliding locking ring 8-5 moves back and forth along the lockable piston rod 3, while the wedge-shaped fixed locking ring 8-4 is tightly attached to the hydraulic cylinder end cover 7. A limit hole is provided in the inner cavity of the spring seat 2. The wedge-shaped sliding locking ring 8-5 and the wedge-shaped fixed locking ring 8-4 are located on the side of the limit hole closest to the hydraulic cylinder end cover 7, and the wedge-shaped sliding locking ring 8-5 can only move back and forth on this side. The locking spring 8-1 is located on the other side of the limit hole, tightly attached to the inner cavity of the spring seat 2. A mechanical locking device oil inlet connector 8-3 is installed on the outer wall of the spring seat 2 at the gap between the wedge-shaped sliding locking ring 8-5 and the wedge-shaped fixed locking ring 8-4. An vent hole 8-2 is machined on the outer wall of the spring seat 2 along the side of the locking spring 8-1. Adjusting the stiffness of the locking spring 8-1 so that when the locking spring 8-1 extends, it pushes the wedge-shaped sliding locking ring 8-5 towards the wedge-shaped fixed locking ring 8-4. When the locking spring 8-1 is fully extended, the wedge-shaped sliding locking ring 8-5 can hold the lockable piston rod 3. At this time, the lockable piston rod 3 is in a locked state and cannot extend or retract. When pressurized oil is supplied to the mechanical locking device inlet connector 8-3, the hydraulic oil reaches the gap between the wedge-shaped fixed locking ring 8-4 and the wedge-shaped sliding locking ring 8-5, pushing the wedge-shaped sliding locking ring 8-5 away from the wedge-shaped fixed locking ring 8-4, and the locking spring 8-1 is in a compressed state. At this time, the mechanical locking device 8 is in an unlocked state, and the lockable piston rod 3 can extend or retract freely. When an emergency occurs during the extension or retraction of the lockable piston rod 3 and it needs to be stopped, the mechanical locking device inlet connector 8-3 releases oil, and under the compression of the locking spring 8-1, the oil in the gap between the wedge-shaped fixed locking ring 8-4 and the wedge-shaped sliding locking ring 8-5 flows into the oil tank. The locking spring 8-1 pushes the wedge-shaped sliding locking ring 8-5 towards the wedge-shaped fixed locking ring 8-4, pressing the wedge-shaped sliding locking ring 8-5. Under the action of the wedge-shaped surface, the wedge-shaped sliding locking ring 8-5 grips the extended or retracted lockable piston rod 3, achieving mechanical locking of the lockable piston rod 3. During the locking process, hydraulic oil can be introduced into the vent hole 8-2 to increase the locking force of the mechanical locking device 8. The spring seat 2 is equipped with inner and outer ring seals to isolate the hydraulic oil in the piston rod cavity and the locking cavity.

[0056] The mechanical locking device 8 and the hydraulic locking device 12 can achieve double locking of the hydraulic cylinder, increasing the reliability of the hydraulic cylinder's operation.

[0057] The hydraulic cylinder end cap 7, mechanical locking device 8, spring seat 2, guide sleeve 10, and piston seal assembly 11 are sequentially installed along the lockable piston rod 3. The end face of the spring seat 2 is machined with external threads, while the piston seal assembly 11 and guide sleeve 10 are machined with internal threads. The external thread of the spring seat 2 engages with the internal thread of the hydraulic cylinder barrel 9, fixing the spring seat 2 inside the hydraulic cylinder barrel 9, preventing relative movement between the spring seat 2 and the hydraulic cylinder barrel 9. The internal thread of the guide sleeve 10 engages with the external thread at the tail of the lockable piston rod 3, allowing the guide sleeve 10 to move back and forth along the inner wall of the hydraulic cylinder barrel 9 following the lockable piston rod 3. Similarly, the internal thread of the piston seal assembly 11 engages with the external thread of the lockable piston rod 3, placing the piston seal assembly 11 tightly against the guide sleeve 10, with the piston seal assembly 11 located to the left of the guide sleeve 10. Air is expelled from the hydraulic cylinder rod cavity, and the spring seat 2 is then screwed in, forming a sealed volume within the hydraulic cylinder rod cavity. Then, the mechanical locking device 8 is installed along the spring seat 2 and the hydraulic cylinder end cover 7 is closed. Subsequently, the air in the cylinder locking piston rod 3 is discharged, so that the multi-functional tailstock 5 and the hydraulic cylinder barrel 9 are welded together to form a sealed volume of the cylinder locking piston rod 3.

[0058] The hydraulic cylinder barrel 9 and the multi-functional tailstock 5 adopt a welded structure and are processed after welding, which can ensure the strength of the cylinder body and the dimensional accuracy of the inner cylinder.

[0059] The piston 3, spring seat 2, and multi-functional tailstock 5 are sealed with a high-temperature resistant sealing assembly. Depending on the ambient temperature, silicone rubber seals are used when the temperature is below 250℃, and metal seal structures are used when the temperature is below 350℃.

[0060] The present invention employs a dual guide sleeve 10 and a spring seat 2 to prevent the lockable piston rod 3 from jamming during the reciprocating motion of the hydraulic cylinder barrel 9, reduce the damage to the components on the lockable piston rod 3 and the hydraulic cylinder barrel 9, and ensure the reliability of the hydraulic cylinder operation.

[0061] The working principle of the emergency rescue high-temperature resistant hydraulic cylinder of this invention is as follows: The cooling water jacket 1 is fixed to the outer wall of the hydraulic cylinder barrel 9 by means of wedge-shaped clamping rings 1-8 and locking nuts 1-9. The external thread of the spring seat 2 is screwed into the internal thread of the hydraulic cylinder barrel 9, so that the spring seat 2 is fixed inside the hydraulic cylinder barrel 9. The internal thread of the guide sleeve 10 is screwed into the external thread of the tail of the lockable piston rod 3, and the guide sleeve 10 moves back and forth along the inner wall of the hydraulic cylinder barrel 9 following the lockable piston rod 3. The internal thread of the piston sealing assembly 11 is screwed into the external thread of the lockable piston rod 3. The air in the hydraulic cylinder rod cavity is discharged and the spring seat 2 is screwed in to form a sealed volume of the hydraulic cylinder rod cavity. Then, the mechanical locking device 8 is installed along the spring seat 2 and the hydraulic cylinder end cover 7 is covered. Subsequently, the air in the plug cavity of the lockable piston rod 3 of the hydraulic cylinder is discharged, so that the multi-functional tail seat 5 is welded to the hydraulic cylinder barrel 9 as a whole, forming a sealed volume of the plug cavity of the lockable piston rod 3 of the hydraulic cylinder. A hydraulic locking device 12 is installed in the multi-functional tailstock 5.

[0062] When hydraulic oil enters the hydraulic cylinder plug chamber inlet connector 6, the hydraulic oil passes through plug chamber inlet channel I 5-2, pushing the valve core 12-3 towards the plug 12-1. Plug chamber inlet channel I 5-2 is connected to plug chamber inlet channel II 5-3, allowing oil to enter the plug chamber of the hydraulic cylinder lockable piston rod 3, thus moving the lockable piston rod 3. The oil in the rod chamber of the hydraulic cylinder lockable piston rod 3 returns to the oil tank via the rod chamber inlet pipe 4. Similarly, when oil enters the rod chamber of the hydraulic cylinder lockable piston rod 3, the oil enters through the rod chamber inlet port 4-1-1 at the rod chamber inlet pipe 4 and splits into two paths. One path passes through the rod chamber inlet straight pipe connector 4-1-3 and enters the rod chamber inlet straight pipe 4-2, reaching the rod chamber of the hydraulic cylinder lockable piston rod 3. Another path leads to the push rod movement channel 5-4 via the multi-functional tailstock connection joint 4-1-2. This pushes the push rod 12-4 along the push rod movement channel 5-4 towards the plug 12-1. The plug cavity oil inlet channel I 5-2 and the plug cavity oil inlet channel II 5-3 are connected, allowing the oil in the lockable piston rod 3 to return to the oil tank via the plug cavity oil inlet joint 6. When oil no longer enters the rod cavity oil inlet 4-1-1 at the rod cavity oil inlet joint I 4-1, no more hydraulic oil enters the push rod movement channel 5-4 via the rod cavity oil inlet straight pipe connection joint 4-1-3. Therefore, the push rod 12-4 cannot be pushed towards the plug 12-1. Under the action of the spring 12-2, the valve core 12-3 prevents the plug cavity oil inlet channel I 5-2 and the plug cavity oil inlet channel II 5-3 from connecting. The hydraulic cylinder can lock the oil in the piston rod 3 plug cavity, preventing it from returning to the oil tank. At this time, the hydraulic cylinder locks the piston rod 3 in a locked state upon return.

[0063] When pressurized oil is supplied to the mechanical locking device's oil inlet connector 8-3, the hydraulic oil reaches the gap between the wedge-shaped fixed locking ring 8-4 and the wedge-shaped sliding locking ring 8-5, pushing the wedge-shaped sliding locking ring 8-5 away from the wedge-shaped fixed locking ring 8-4, and the locking spring 8-1 is in a compressed state. At this time, the mechanical locking device 8 is in an unlocked state, and the lockable piston rod 3 can freely extend or retract. If an emergency occurs during the extension or retraction of the lockable piston rod 3 and needs to be stopped, the mechanical locking device's oil inlet connector 8-3 releases oil, and under the compression of the locking spring 8-1, the oil in the gap between the wedge-shaped fixed locking ring 8-4 and the wedge-shaped sliding locking ring 8-5 flows into the oil tank. The locking spring 8-1 pushes the wedge-shaped sliding locking ring 8-5 towards the wedge-shaped fixed locking ring 8-4, pressing the wedge-shaped sliding locking ring 8-5. Under the action of the wedge-shaped surface, the wedge-shaped sliding locking ring 8-5 grips the extended or retracted lockable piston rod 3, achieving mechanical locking of the lockable piston rod 3. During the locking process, hydraulic oil can be introduced into the vent hole 8-2 to increase the locking force of the mechanical locking device 8.

[0064] The cooling water in the circulating spiral water tank 1-3 carries away the heat generated by the hydraulic cylinder. This prevents damage to the internal seals of the hydraulic cylinder under high temperatures, ensuring normal production and extending the cylinder's lifespan. The multi-functional tailstock 5 has a plug cavity oil inlet connector installation channel 5-1, a plug cavity oil inlet channel I 5-2, a plug cavity oil inlet channel II 5-3, and a push rod movement channel 5-4. The multi-functional tailstock 5 has internal flow channels with different functions, enabling the hydraulic cylinder to perform lifting and locking functions as well as external interface integration. When hydraulic oil is supplied to the mechanical locking device oil inlet connector 8-3, the mechanical locking device 8 is in the unlocked state, allowing the lockable piston rod 3 to extend or retract freely. In case of an emergency requiring a stop, the mechanical locking device oil inlet connector 8-3 releases oil, and the wedge-shaped sliding locking ring 8-5 in the mechanical locking device 8, under the action of its wedge-shaped surface, grips the extended or retracted lockable piston rod 3, achieving mechanical locking of the lockable piston rod 3. The mechanical locking device 8 and the hydraulic locking device 12 serve as backups for each other, increasing the reliability of the hydraulic cylinder operation.

Claims

1. A high-temperature resistant hydraulic cylinder for emergency rescue, characterized in that: The system includes a hydraulic cylinder barrel, with a cooling water jacket coaxially sleeved on the outer wall of the cylinder barrel. A lockable piston rod is coaxially sleeved at the center of the hydraulic cylinder barrel. One end of the hydraulic cylinder barrel is connected to a multi-functional tailstock, and the other end is connected to a spring seat. A guide sleeve and a piston seal assembly are sequentially provided at the connection between one end of the lockable piston rod and the multi-functional tailstock. The other end of the lockable piston rod extends from the head end of the hydraulic cylinder barrel through the spring seat. A mechanical locking device is provided at the connection between the lockable piston rod and the spring seat. The lockable piston rod is connected to the multi-functional tailstock via the rod chamber oil inlet line; The multi-functional tailstock is provided with a valve core working channel. One end of the valve core working channel is provided with a push rod movement channel and a rod cavity oil inlet connector I installation channel in sequence. The other end of the valve core working channel is provided with a plug installation channel. The middle part of the valve core working channel is connected to one end of the plug cavity oil inlet channel I. The other end of the plug cavity oil inlet channel I is connected to the plug cavity oil inlet connector installation channel. The valve core working channel is set perpendicular to the plug cavity oil inlet channel I. The hydraulic locking device includes a valve core installed in the valve core working channel, one end of a spring pressing against the valve core, and the other end of the spring being pressed into the valve core working channel by a plug. A push rod is also provided in the valve core working channel, with one end of the push rod located close to the valve core and the other end of the push rod connected to the rod cavity oil inlet pipe. The rod chamber oil inlet pipeline includes a rod chamber oil inlet straight pipe, one end of which is connected to the push rod through rod chamber oil inlet connector I, and the other end of which is connected to the lockable piston rod. The cooling water jacket has a double spiral water groove arranged in a cross pattern. The outer wall of the cooling water jacket is coated with a heat insulation coating. The cooling sleeve is coaxially arranged inside the cooling water jacket. One end of the cooling water jacket has a water inlet connector III and a water inlet connector II on opposite sides, and the other end of the cooling water jacket has a water inlet connector I on opposite sides. Sealing rings are installed at both ends of the cooling water jacket. A locking nut is provided at the head connection between the cooling water jacket and the hydraulic cylinder barrel, and a welding flange is provided at the tail connection between the cooling water jacket and the hydraulic cylinder barrel. The lockable piston rod includes a piston rod, one end of which is connected to an ear ring, and the piston rod and the ear ring are connected by threads. The piston rod has a horizontal flow channel and a vertical flow channel inside. The horizontal flow channel is a blind hole and a through hole. The horizontal flow channel and the vertical flow channel are connected. Piston rod plugs are provided at both ends of the vertical flow channel where they pass through the edge of the piston rod. The mechanical locking device includes a locking spring, a wedge-shaped sliding locking ring, and a wedge-shaped fixed locking ring sequentially sleeved on the piston rod. A limit hole is opened in the inner cavity of the spring seat. The wedge-shaped sliding locking ring and the wedge-shaped fixed locking ring are located on the side of the limit hole closer to the hydraulic cylinder end cover. The hydraulic cylinder end cover is located at the end of the spring seat away from the hydraulic cylinder barrel. The locking spring is located on the other side of the limit hole, closely attached to the inner cavity of the spring seat. An oil inlet connector for the mechanical locking device is installed on the outer wall of the spring seat at the gap between the wedge-shaped sliding locking ring and the wedge-shaped fixed locking ring.

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