Emergency high-pressure hydraulic check valve

Abstract

Provided is an emergency high-pressure pilot-operated check valve. A return bolt and an emergency bolt are horizontally bolted and installed at the upper and lower parts of the vertical fluid passage Ⅰ of the "T"-shaped fluid passage of the valve body respectively. The return bolt and the emergency bolt are respectively provided with water fluid passages Ⅱ and Ⅲ. The fluid passages Ⅱ and Ⅲ are communicated with the fluid passage Ⅰ. The change of the horizontal bolting depth positions of the return bolt and the emergency bolt relative to the valve body is used to adjust the diameter flow velocity at the connection of the fluid passages Ⅱ, Ⅲ and Ⅰ. A piston assembly is installed in the fluid passage Ⅰ. One end of the piston assembly is communicated with the fluid passage Ⅱ, and the other end is truncated or conducted to communicate with the fluid passage Ⅲ through a ball Ⅰ and a spring. A ball Ⅱ for manual pressure relief and an adjusting bolt are also installed in the fluid passage Ⅲ. The structure of the present invention is compact and small in size; it is mainly used for railway recovery equipment; the hydraulic oil control operation is stable, safe and reliable; it has a manual emergency release and reset function; it has a function of adapting to and adjusting the speed of the oil cylinder extending and retracting; it is convenient for installation and debugging; it is economical and practical and worthy of promotion.

Description

Technical Field

[0001] The present invention belongs to the technical field of fluid valves, and particularly relates to an emergency high-pressure hydraulic check valve. Background Art

[0002] An ordinary check valve has the function of one-way conduction, conducting in one direction and blocking in the other direction. Compared with an ordinary check valve, a hydraulic check valve can be opened by hydraulic oil pressure. When there is no hydraulic control pressure, the hydraulic check valve can only conduct in one direction; when there is hydraulic control pressure, the hydraulic check valve conducts in both directions.

[0003] In the prior art, taking the double hydraulic check valve disclosed in the authorized announcement number CN206346977U as an example for a hydraulic control valve that realizes two-way conduction. Although it realizes the miniaturized design of the double hydraulic check valve, saves space, and at the same time realizes the association of two hydraulic check valves through a connecting shaft, and the hydraulic cylinder will not suddenly drop, ensuring safety. However, its disadvantages are as follows: First, the hydraulic flow rate in the hydraulic channel cannot be adjusted, and the extension and retraction speeds of the hydraulic cylinder cannot be effectively regulated; second, in an emergency state, when a pump station or the pipeline of the connecting oil pipe fails, the hydraulic cylinder cannot be effectively retracted, affecting the stability of the safe and reliable operation of the equipment. For this reason, the following improved technical solutions are proposed. Summary of the Invention

[0004] The technical problem solved by the present invention: Provide an emergency high-pressure hydraulic check valve, which adopts the method of bolting a return bolt 1 and an emergency bolt 5 with hydraulic channels to a valve body 3, and adjusts the axial misalignment position of the return and emergency bolts relative to the valve body 3 to further adjust the diameter of the hydraulic channel, thereby realizing the adjustment of the hydraulic flow rate, and solving the technical problem of effectively regulating the extension and retraction speeds of the hydraulic cylinder; adopt the method of installing an adjusting bolt 10, an adjusting nut 4, and a steel ball II 9 in the hydraulic channel of the emergency bolt 5 to manually cut off or conduct the outflow of hydraulic oil, and solve the technical problem that the hydraulic cylinder cannot be effectively retracted when a pump station or the pipeline of the connecting oil pipe fails in an emergency state.

[0005] Technical solution adopted by the present invention: An emergency high-pressure hydraulic check valve, comprising a valve body, characterized in that: the valve body is provided with a "T"-shaped fluid passage horizontally penetrating the valve body; at the upper and lower parts of the vertical fluid passage I of the "T"-shaped fluid passage of the valve body, a return bolt and an emergency bolt are respectively horizontally bolted and installed; the bolt bodies of the return bolt and the emergency bolt are respectively provided with horizontally penetrating fluid passages II and III; the horizontally penetrating fluid passages II and III of the return bolt and the emergency bolt are communicated with the vertical fluid passage I of the "T"-shaped fluid passage of the valve body; the change in the horizontal bolting depth position of the emergency bolt relative to the valve body is used to adjust the diameter flow rate at the connection between the fluid passage III and the lower part of the fluid passage I; a piston assembly is installed in the vertical fluid passage I of the "T"-shaped fluid passage of the valve body; one end of the piston assembly is communicated with the horizontal fluid passage II of the return bolt; the other end of the piston assembly cuts off or conducts the horizontal fluid passage III communicating with the emergency bolt through a ball I and a spring; a ball II and an adjusting bolt are also installed in the horizontal fluid passage III of the emergency bolt; the ball II and the adjusting bolt are used to manually cut off or conduct the passage between the fluid passage III of the emergency bolt and the horizontal fluid passage V of the valve body.

[0006] In the above technical solution, further: the horizontal fluid passage II of the return bolt includes a B port at one end and a C port at the other end; the horizontal fluid passage III of the emergency bolt includes a D port at one end; the horizontal fluid passage V in the "T"-shaped fluid passage of the valve body has an A port; the A port and the B port are connected to a pump station; the C port is connected to the rod chamber of the oil cylinder; the D port is connected to the rodless chamber of the oil cylinder.

[0007] In the above technical solution, further: screw plugs are respectively coaxially and rotatably fitted and installed at the upper and lower ends of the vertical fluid passage I of the "T"-shaped fluid passage of the valve body; the vertical fluid passages VI that intersect the horizontal fluid passages II and III at right angles and penetrate the screw rods are respectively provided in the horizontal fluid passages II and III of the return bolt and the emergency bolt; the vertical fluid passages VI penetrating the screw rods of the return bolt and the emergency bolt are communicated with the fluid passage I of the valve body.

[0008] In the above technical solution, further: the diameter of the outer end of the fluid passage VI of the emergency bolt communicating with the screw plug is the small-diameter end; the diameter of the inner end of the fluid passage VI of the emergency bolt communicating with the lower part of the fluid passage I is the large-diameter end; the diameter of the large-diameter end is equal to the inner diameter at the connection between the lower part of the fluid passage I; the size of the offset translation opening between the diameter of the large-diameter end and the diameter at the connection between the lower part of the fluid passage I is used to adjust the flow rate of the fluid passage III of the emergency bolt.

[0009] In the above technical solution, further: a lock nut for rotatably fitting and locking its position is provided on the emergency bolt.

[0010] In the above technical solution, further: a boss is provided in the vertical fluid channel I of the T-shaped fluid channel of the valve body; the boss is provided between the horizontal fluid channel V in the T-shaped fluid channel of the valve body and the horizontal fluid channel III of the emergency bolt; a steel ball I is provided at the boss; the steel ball I is used to seal, cut off or conduct the passage between the fluid channel III and the fluid channel V.

[0011] In the above technical solution, further: a boost chamber is provided in the middle of the vertical fluid channel I of the T-shaped fluid channel of the valve body; the diameter of the boost chamber is larger than the diameter of the fluid channel II; and a piston assembly is provided in the boost chamber.

[0012] In the above technical scheme, further: one end of the horizontal fluid channel III of the emergency bolt is coaxially screwed with an adjusting bolt through an internal thread; the screw-in end of the adjusting bolt fixes a steel ball II; the other end of the horizontal fluid channel III of the emergency bolt is provided with a vertical fluid channel VII vertically connected to the fluid channel III; the valve body is provided with a vertical fluid channel IV parallel to the fluid channel I; the upper end of the fluid channel IV is vertically connected to the horizontal fluid channel V in the T-shaped fluid channel of the valve body; the lower end of the fluid channel IV is connected to the fluid channel VII of the emergency bolt; a steel ball II is provided at the junction of the vertical fluid channel VII of the emergency bolt and the horizontal fluid channel III of the emergency bolt; the steel ball II is used to conduct or cut off the passage between the fluid channel III and the fluid channels VII, IV, and V by manually adjusting the adjusting bolt.

[0013] The advantages of the present invention compared with the prior art are:

[0014] The emergency bolt 5 of the present invention can adjust its horizontal depth installation position relative to the valve body 3; thereby adjusting the opening size of the misaligned transition point between the fluid channel III and the fluid channel I; thereby adjusting the flow rate of the fluid channel III, and realizing the control and adjustment of the extension and retraction speed of the cylinder piston rod.

[0015] The present invention is provided with an emergency bolt 5 and an adjusting bolt 10. When the oil pump or the connecting oil pipe fails, the adjusting bolt 10 is unscrewed to allow the steel ball II 9 to enter the left end of the fluid channel III, thereby opening the passages of the fluid channels III, VII, IV, and V, so that the hydraulic oil at the D port flows out from the A port, thereby retracting the oil cylinder in a controlled manner.

[0016] The setting of the boost chamber 302 of the present invention can stabilize the working pressure of the oil cylinder before the oil pressure is boosted; ensure the safety performance of the oil cylinder under high pressure; and meet the working and use requirements of the hydraulic valve under high pressure.

[0017] The present invention can be connected to both the rod chamber and the rodless chamber of the oil cylinder simultaneously: hydraulic oil flows into the return bolt 1 and the piston assembly 2 through port B and enters the rod chamber of the oil cylinder; as the pressure increases, the piston assembly 2 pushes the steel ball I 7 away from the plugging port boss 301, allowing the hydraulic oil in the rodless chamber to flow into the emergency bolt 5 through port D, and then flow out through port A after passing through the steel ball 7 and the piston assembly 2; that is, the rodless chamber of the oil cylinder is opened by pressure; realizing the controlled telescoping of the oil cylinder.

[0018] At both the upper and lower ends of the valve body 3 of the present invention, there are respectively provided plug screws 6. When a failure occurs at port A and the hydraulic oil cannot flow out smoothly, the plug screws 6 can be opened to enable the hydraulic oil in the rodless chamber of the oil cylinder to be discharged smoothly from the plug screws 6.

[0019] The valve structure of the present invention is compact and small in size; it is mainly used in railway recovery equipment; the control of hydraulic oil for work operation is stable, safe and reliable; it has a manual emergency release function; it is convenient for installation and debugging; it is economical and practical and worthy of promotion. Brief Description of the Drawings

[0020] Figure 1 is a schematic cross-sectional structure diagram of the present invention;

[0021] Figure 2 is for the present invention Figure 1 left view. Detailed Embodiment

[0022] The following combines the attached Figure 1-2 to describe the specific embodiments of the present invention.

[0023] The following embodiments facilitate a better understanding of the present invention, but do not limit the present invention. The following embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components and materials used in the following embodiments are commercially available unless otherwise specified.

[0024] In the present invention, unless otherwise clearly specified and defined, in the case of no contrary description, the orientation words such as "upper, lower, left, right, inner, outer, top, bottom, vertical, horizontal" included in the terms only represent the orientation of the terms in the normal use state, or for the convenience of describing the present invention and simplifying the description, or the common names understood by those skilled in the art. Unless otherwise clearly specified and defined, they should not be regarded as a limitation to the technical solution.

[0025] In addition, in the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connection", "setting", "provided with" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection, and it can be a mechanical connection; it can be directly connected, or indirectly connected through other intermediate components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention should be understood according to the specific circumstances.

[0026] It should be noted that the terms "I", "II", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the components used in this way can be interchanged under appropriate circumstances so as to describe the embodiments of the present invention described herein.

[0027] The emergency high-pressure hydraulically controlled one-way valve comprises a valve body 3 of a casting structure.

[0028] The valve body 3 is formed with a "T"-shaped fluid channel that runs horizontally through the valve body; that is, the "T"-shaped fluid channel is horizontally arranged, and the vertical fluid channel I in the T"-shaped fluid channel runs through the valve body 3 up and down; the horizontal fluid channel V in the T"-shaped fluid channel is vertically connected to the middle part of the vertical fluid channel I to form a "T"-shaped flow-through structure.

[0029] The upper and lower parts of the vertical fluid channel I of the T-shaped fluid channel of the valve body 3 are respectively provided with internal threaded holes in the horizontal direction; the horizontal internal threaded hole in the lower part of the valve body 3 is used for screwing and fitting the emergency bolt 5 (horizontally bolted installation). The depth adjustment function of the emergency bolt 5 relative to the horizontal installation position of the valve body 3 is realized, thereby laying a foundation for the flow rate adjustment, and further laying a foundation for the extension and retraction speed adjustment of the oil cylinder.

[0030] The return bolt 1 and the emergency bolt 5 are respectively provided with horizontally penetrating fluid passages II and III; that is, the bolt rod of the return bolt 1 is provided with horizontally penetrating fluid passage II; the bolt rod of the emergency bolt 5 is provided with horizontally penetrating fluid passage III.

[0031] The fluid passages II and III horizontally penetrated by the return bolt 1 and the emergency bolt 5 are respectively vertically connected to the vertical fluid passage I of the T-shaped fluid passage of the valve body 3 .

[0032] In the above embodiment, further: the horizontal fluid channel II of the return bolt 1 includes a B port on the left end and a C port on the right end. The B port is connected to the pump station, and the C port is connected to the rod chamber of the oil cylinder. The B port is connected to the pump station oil pipe through the outer end of the bolt head on the left side of the return bolt 1, and the external thread is connected to the extension section. The C port is directly connected to the rod chamber of the oil cylinder through the external thread on the right side of the screw rod of the return bolt 1.

[0033] The horizontal fluid passage III of the emergency bolt 5 includes a D port at the right end; the D port is connected to the rodless chamber of the oil cylinder. The D port is also connected to the rodless chamber of the oil cylinder through the external thread on the right end of the bolt rod of the emergency bolt 5.

[0034] The horizontal fluid passage Ⅴ in the T-shaped fluid passage of the valve body 3 has a port A; the port A is connected to a pumping station. Specifically, the horizontal fluid passage Ⅴ in the T-shaped fluid passage is integrally cast with the valve body and then finely machined; the port A is connected to the oil pipe of the pumping station through the internally threaded hole made. Or the horizontal fluid passage Ⅴ in the T-shaped fluid passage is only finely machined later.

[0035] The change in the horizontal bolting depth position of the external thread of the emergency bolt 5 relative to the lower horizontal internal threaded hole made at the lower end of the valve body 3 is used to adjust the misaligned opening diameter at the vertical transfer joint between the fluid passage Ⅲ and the lower part of the fluid passage Ⅰ, thereby adjusting the flow velocity, realizing the adjustment of the flow rate of the fluid passage Ⅲ, and further realizing the adjustment and control function of the extension and retraction speed of the oil cylinder piston rod.

[0036] In the above embodiment, further: Plug 6 is coaxially and rotatably fitted and installed at the upper and lower ends of the vertical fluid passage Ⅰ of the T-shaped fluid passage of the valve body 3; Vertical fluid passages Ⅵ that intersect the horizontal fluid passages Ⅱ and Ⅲ at right angles and penetrate the screw are respectively made in the horizontal fluid passages Ⅱ and Ⅲ of the return bolt 1 and the emergency bolt 5; that is, a vertical fluid passage Ⅵ that intersects the horizontal fluid passage Ⅱ at right angles and penetrates the screw is made in the horizontal fluid passage Ⅱ of the return bolt 1; A fluid passage Ⅵ that intersects the horizontal fluid passage Ⅲ at right angles and penetrates the screw is made in the horizontal fluid passage Ⅲ of the emergency bolt 5. The vertical fluid passages Ⅵ of the return bolt 1 and the emergency bolt 5 are respectively communicated with the fluid passage Ⅰ of the valve body 3.

[0037] To solve the problem of adjusting the flow rate of the fluid passage Ⅲ:

[0038] In the above embodiment, further: The diameter of the outer end of the fluid passage Ⅵ of the emergency bolt 5 communicating with the plug 6 is the small diameter end 601; the diameter of the inner end of the fluid passage Ⅵ of the emergency bolt 5 communicating with the lower part of the fluid passage Ⅰ is the large diameter end 602; the diameter of the large diameter end 602 is equal to the inner diameter at the transfer joint of the lower part of the fluid passage Ⅰ; the misaligned translation opening size between the diameter of the large diameter end 602 and the diameter at the transfer joint of the lower part of the fluid passage Ⅰ is used to adjust the flow velocity of the fluid passage Ⅲ of the emergency bolt 5.

[0039] In the above embodiment, further: A locking nut 501 for rotatably fitting and locking the position of the emergency bolt 5. The axially inner end face of the locking nut 501 abuts against the outer wall of the valve body 3 to lock the position of the emergency bolt 5.

[0040] That is, when the small diameter end 601 is coaxially aligned with the fluid passage Ⅰ, the flow rate of the fluid passage Ⅲ is the largest; when the small diameter end 601 is misaligned with the fluid passage Ⅰ the most, the flow rate of the fluid passage Ⅲ is the smallest. Thus, the problem of adaptive adjustment of the extension and retraction speed of the oil cylinder piston rod is solved.

[0041] A piston assembly 2 is installed in the vertical fluid passage Ⅰ of the T-shaped fluid passage of the valve body 3. The piston rod assembly 2 includes a piston body and a piston rod. The piston body is slidably and sealingly adapted to the inner cavity of the fluid passage Ⅰ. The hydraulic oil flowing from the fluid passage Ⅱ into the fluid passage Ⅰ pushes the piston assembly 2 to move downward.

[0042] The upper end fluid passage Ⅰ of the piston assembly 2 communicates with the horizontal fluid passage Ⅱ of the return bolt 1. The lower end of the piston rod of the piston assembly 2 pushes against the steel ball Ⅰ 7, and the steel ball Ⅰ 7 pushes against the spring 8. The steel ball Ⅰ 7 and the spring 8 are used to cut off or conduct the passage between the horizontal fluid passage Ⅲ of the emergency bolt 5 and the fluid passage Ⅴ.

[0043] A steel ball Ⅱ 9 is installed at the left end inside the horizontal fluid passage Ⅲ of the emergency bolt 5. At the outer end of the steel ball Ⅱ 9, an adjusting bolt 10 is installed in a coaxial plugging and screwing fit in the internal thread hole made at the left end of the horizontal fluid passage Ⅲ of the emergency bolt 5. The steel ball Ⅱ 9 and the adjusting bolt 10 are used to manually cut off or conduct the passage between the fluid passage Ⅲ of the emergency bolt 5 and the horizontal fluid passage Ⅴ of the valve body 3.

[0044] The adjusting bolt 10 is used to push and fix the position of the steel ball Ⅱ 9. A fluid passage Ⅶ that vertically communicates with the fluid passage Ⅲ is made in the horizontal fluid passage Ⅲ of the emergency bolt 5.

[0045] The valve body 3 is provided with a vertical fluid passage Ⅳ parallel to the fluid passage Ⅰ. The upper end of the fluid passage Ⅳ vertically communicates with the horizontal fluid passage Ⅴ in the T-shaped fluid passage of the valve body 3. The lower end of the fluid passage Ⅳ communicates with the fluid passage Ⅶ of the emergency bolt 5. That is, a steel ball Ⅱ 9 is provided at the transfer junction of the vertical fluid passage Ⅶ and the horizontal fluid passage Ⅲ of the emergency bolt 5. The steel ball Ⅱ 9 is used to conduct or cut off the passage between the fluid passage Ⅲ and the fluid passages Ⅶ, Ⅳ, and Ⅴ by manually adjusting the adjusting bolt 10.

[0046] That is, the fluid passage Ⅶ directly communicates with the fluid passages Ⅳ and Ⅴ made in the valve body 3. The steel ball Ⅱ 9 is cut off and fixed at the transfer junction of the fluid passages Ⅲ and Ⅶ. The steel ball Ⅱ 9 and the adjusting bolt 10 are used to manually cut off or conduct the passage between the fluid passages Ⅲ, Ⅶ of the emergency bolt 5 and the fluid passages Ⅳ, Ⅴ of the valve body 3.

[0047] During use: When the adjusting bolt 10 is screwed out to the left, the steel ball Ⅱ 9 is pushed to move to the left by the hydraulic pressure, conducting the passage between the fluid passages Ⅲ, Ⅶ and the fluid passages Ⅳ, Ⅴ of the valve body 3, for manual retraction control of the piston rod. When the adjusting bolt 10 is screwed in to the right, the steel ball Ⅱ 9 is pushed to move to the right by the screw rod of the adjusting bolt 10, and the right end of the right-moved steel ball Ⅱ 9 is limited and blocked at the cross transfer junction of the fluid passages Ⅶ and Ⅲ. At this time, the steel ball Ⅱ 9 cuts off the passage between the fluid passage Ⅲ and the fluid passages Ⅶ, Ⅳ, Ⅴ.

[0048] To achieve the switching of the truncation and conduction functions of the fluid passage Ⅰ of the valve body 3 through the piston assembly 2, the steel ball Ⅰ 7, and the spring 8 by using a simple structure:

[0049] In the above embodiment, further: a boss 301 is provided in the vertical fluid passage Ⅰ of the T-shaped fluid passage of the valve body 3; the upper end of the boss 301 is small and the lower end is large, and the boss 301 is provided between the horizontal fluid passage Ⅴ of the T-shaped fluid passage of the valve body 3 and the horizontal fluid passage Ⅲ of the emergency bolt 5; a steel ball Ⅰ 7 is provided at the boss 301; the steel ball Ⅰ 7 is used to seal and truncate or conduct the passage between the fluid passage Ⅲ and the fluid passage Ⅴ. When the steel ball Ⅰ 7 is pushed downward by the piston assembly 2 and leaves the boss 301, the passage between the passage Ⅲ and the passage Ⅴ is conducted; when the steel ball Ⅰ 7 is pushed by the reset pressure of the spring 8 in the compressed state and is stuck at the boss 301, the passage between the passage Ⅲ and the passage Ⅴ is in a truncated state.

[0050] To cooperate with the spring 8, when the hydraulic oil pushes the piston assembly 2 to move downward, it needs to overcome the compression elastic force of the spring 8 to push the steel ball Ⅰ 7 away from the boss 301 through the piston rod of the piston assembly 2; to meet the large-pressure use requirements of the hydraulic control valve:

[0051] In the above embodiment, further: a pressure boosting chamber 302 is provided in the middle of the vertical fluid passage Ⅰ of the T-shaped fluid passage of the valve body 3; the diameter of the pressure boosting chamber 302 is larger than the diameter of the fluid passage Ⅱ; the piston of the piston assembly 2 is slidably and sealingly fitted in the pressure boosting chamber 302. Only when the pressure difference between the pressure boosting chamber 302 and the rodless chamber of the oil cylinder is large enough can it be conducted, so as to meet the large-pressure use requirements of the hydraulic control valve.

[0052] In the above embodiment, further: to solve the technical problem of manually retracting the piston rod of the oil cylinder for pressure relief and conduction in the case of a failure of the hydraulic control valve by using a simple structure.

[0053] One end of the horizontal fluid passage Ⅲ of the emergency bolt 5 is coaxially screwed and fitted with an adjusting bolt 10 through the internally threaded portion made. The other end of the horizontal fluid passage Ⅲ of the emergency bolt 5 is provided with a vertical fluid passage Ⅶ vertically communicating with the fluid passage Ⅲ; the screwed end of the adjusting bolt 10 pushes the steel ball Ⅱ 9 to limit and fix the right end of the steel ball Ⅱ 9 and block it at the connection between the fluid passage Ⅲ and the fluid passage Ⅶ. The left end of the connection between the fluid passage Ⅲ and the fluid passage Ⅶ has a large diameter and the right end has a small diameter, and the formed boss is used to limit and block the steel ball Ⅱ 9.

[0054] The valve body 3 is provided with a vertical fluid passage Ⅳ parallel to the fluid passage Ⅰ; the upper end of the fluid passage Ⅳ is vertically connected to the horizontal fluid passage Ⅴ in the T-shaped fluid passage of the valve body 3; the lower end of the fluid passage Ⅳ is connected to the fluid passage Ⅶ of the emergency bolt 5; that is, a steel ball Ⅱ 9 is provided at the transfer junction of the vertical fluid passage Ⅶ and the horizontal fluid passage Ⅲ of the emergency bolt 5; the steel ball Ⅱ 9 is used to conduct or cut off the passage between the fluid passage Ⅲ and the fluid passages Ⅶ, Ⅳ, and Ⅴ through manual adjustment of the adjusting bolt 10.

[0055] During use: when the adjusting bolt 10 is screwed out to the left, the steel ball Ⅱ 9 is pushed to move leftward by hydraulic pressure, conducting the passage between the fluid passages Ⅲ, Ⅶ and the fluid passages Ⅳ, Ⅴ of the valve body 3 for manual retraction control of the piston rod. When the adjusting bolt 10 is screwed into the right, the steel ball Ⅱ 9 is pushed to move rightward by the screw rod of the adjusting bolt 10, and the right end of the rightward-moving steel ball Ⅱ 9 is limited and blocked at the cross transfer junction of the fluid passages Ⅶ and Ⅲ. At this time, the steel ball Ⅱ 9 cuts off the passage between the fluid passage Ⅲ and the fluid passages Ⅶ, Ⅳ, Ⅴ.

[0056] The working principle of the present invention is:

[0057] During connection: Ports A and B are connected to the oil pipe and the pump station through hydraulic components, port C is connected to the rod chamber of the oil cylinder, and port D is connected to the rodless chamber of the oil cylinder.

[0058] During operation: Hydraulic oil flows from port B into the return bolt 1 and the piston assembly 2 and enters the rod chamber of the oil cylinder. As the pressure increases, the piston assembly 2 pushes the steel ball Ⅰ 7 away from the sealing port boss 301, so that the hydraulic oil in the rodless chamber flows from port D into the emergency bolt 5, passes through the gap between the steel ball Ⅰ 7 and the piston rod of the piston assembly 2, and flows out from port A.

[0059] The principle of the piston rod of the oil cylinder extending and retracting is: when the hydraulic oil at port A is large enough, the hydraulic oil pushes the steel ball Ⅰ 7 from port A to press the spring 8 and flows through port D into the rodless chamber of the oil cylinder, pushing the piston rod of the oil cylinder to extend; the hydraulic oil at the rod chamber end of the oil cylinder flows from port C through the return bolt 1 to port B and returns to the pump station. When the pump station is not operated, this valve block can ensure that the oil cylinder works under high pressure without pressure relief. When the piston rod of the oil cylinder retracts: the hydraulic oil enters the rod chamber of the oil cylinder from ports B and C. When the hydraulic oil is large enough, it simultaneously pushes the piston assembly 2 to move downward, and then pushes the steel ball Ⅰ 7 away from the sealing port boss 301 to press the spring 8, so that the hydraulic oil in the rodless chamber of the oil cylinder flows back from port D to port A.

[0060] During use, when the pump station or the pipeline connecting ports A and B fails and cannot work: the adjusting nut 4 can be manually opened to rotate the adjusting bolt 10 to move and open the steel ball Ⅱ 9 in the emergency bolt, so that the hydraulic oil flows back from the fluid passages Ⅶ, Ⅳ to port A. When the hydraulic oil cannot flow back through the adjusting nut 4 and the adjusting bolt 10, the plug 6 can be manually unscrewed to enable the hydraulic oil to be smoothly discharged from the position of the plug 6 to retract the piston rod.

[0061] This valve block is mainly used in railway recovery equipment. It can keep the oil cylinder from discharging pressure within several minutes after the oil pump stops working, and work under high pressure to ensure the safe and reliable operation of the recovery equipment.

[0062] From the above description, it can be found that: the emergency bolt 5 of the present invention can adjust its horizontal depth installation position relative to the valve body 3; furthermore, adjust the opening size at the misaligned transfer junction of fluid passage Ⅲ and fluid passage Ⅰ; thereby adjusting the flow rate of fluid passage Ⅲ, and solving the technical problem of controlling and adjusting the extending and retracting speeds of the oil cylinder piston rod.

[0063] The present invention is provided with an emergency bolt 5 and an adjusting bolt 10. When the oil pump or the connecting oil pipe fails, by screwing out the adjusting bolt 10, the steel ball Ⅱ 9 enters the left end of fluid passage Ⅲ, thereby opening up the passage of fluid passages Ⅲ, Ⅶ, Ⅳ, and Ⅴ, enabling the hydraulic oil at port D to flow out from port A, so as to retract the oil cylinder in a controlled manner; solving the technical problem that when the return bolt 1 fails, the hydraulic oil at port D can still flow out from port A, realizing the manual emergency retraction of the oil cylinder piston rod.

[0064] The setting of the pressure increasing chamber 302 of the present invention can stabilize the working pressure of the oil cylinder before the oil pressure rises; ensure the safety performance of the oil cylinder under high pressure; solve the technical problem that the hydraulic valve can still work under high pressure.

[0065] The present invention can be connected to both the rod chamber and the non-rod chamber of the oil cylinder at the same time: the hydraulic oil flows into the return bolt 1 and the piston assembly 2 through port B and enters the rod chamber of the oil cylinder; as the pressure increases, the piston assembly 2 pushes the steel ball Ⅰ 7 away from the plug boss 301, enabling the hydraulic oil in the non-rod chamber to flow into the emergency bolt 5 from port D, and flowing out from port A after passing through the steel ball 7 and the piston assembly 2; that is, opening the non-rod chamber of the oil cylinder through pressure; realizing the controlled expansion and contraction of the oil cylinder. Solving the technical problem of the design of a small-sized two-way conducting hydraulic control valve.

[0066] The present invention is respectively provided with plug screws 6 at the upper and lower ends of the valve body 3. When a failure occurs at port A and the hydraulic oil cannot flow out smoothly, by opening the plug screw 6, the hydraulic oil in the non-rod chamber of the oil cylinder can be smoothly discharged from the plug screw 6. Solving the technical problem of emergency pressure relief treatment for valve failures.

[0067] In summary, the valve of the present invention has a compact structure and a small volume; is mainly used in railway recovery equipment; the control of hydraulic oil during operation is stable, safe and reliable; has a manual emergency release and reset function and an adaptive adjustment function for the extending and retracting speeds of the oil cylinder; is convenient for installation and debugging; is economical and practical, and is worthy of promotion.

[0068] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above-described exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be construed as limiting the claims involved.

[0069] In addition, it should be understood that although this specification is described according to one embodiment, this embodiment does not only include an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in this embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0070] The above embodiments are only preferred embodiments of the present invention and are not used to limit the scope of implementation of the present invention. Therefore, all equivalent changes made according to the content described in the claims of the present invention should be included within the scope of the claims of the present invention.

Claims

1. Emergency high-pressure hydraulic check valve, including a valve body (3), characterized in that: The valve body (3) is provided with a "T"-shaped fluid passage that horizontally penetrates the valve body; the upper and lower parts of the vertical fluid passage I of the "T"-shaped fluid passage of the valve body (3) are horizontally bolted with a return bolt (1) and an emergency bolt (5) respectively; the bolt bodies of the return bolt (1) and the emergency bolt (5) are respectively provided with horizontally penetrating fluid passages II and III; the horizontally penetrating fluid passages II and III of the return bolt (1) and the emergency bolt (5) are communicated with the vertical fluid passage I of the "T"-shaped fluid passage of the valve body (3); the change in the horizontal bolting depth position of the emergency bolt (5) relative to the valve body (3) is used to adjust the diameter flow rate at the connection between the fluid passage III and the fluid passage I; a piston assembly (2) is installed in the vertical fluid passage I of the "T"-shaped fluid passage of the valve body (3); one end of the piston assembly (2) is communicated with the horizontal fluid passage II of the return bolt (1); the other end of the piston assembly (2) is truncated or communicated with the horizontal fluid passage III of the emergency bolt (5) through a steel ball I (7) and a spring (8); a steel ball II (9) and an adjusting bolt (10) are also installed in the horizontal fluid passage III of the emergency bolt (5); the steel ball II (9) and the adjusting bolt (10) are used to manually truncate or communicate the passage between the fluid passage III of the emergency bolt (5) and the horizontal fluid passage V of the valve body (3). The upper and lower ends of the vertical fluid passage I of the "T"-shaped fluid passage of the valve body (3) are coaxially and rotatably fitted with plugs (6); the horizontal fluid passages II and III of the return bolt (1) and the emergency bolt (5) are respectively provided with vertical fluid passages VI that intersect the horizontal fluid passages II and III at right angles and penetrate the screw; the vertical fluid passages VI that penetrate the screw of the return bolt (1) and the emergency bolt (5) are communicated with the fluid passage I of the valve body (3). The outer diameter end diameter of the fluid passage VI of the emergency bolt (5) communicating with the plug (6) is the small diameter end (601); the inner diameter end diameter of the fluid passage VI of the emergency bolt (5) communicating with the lower part of the fluid passage I is the large diameter end (602); the diameter of the large diameter end (602) is equal to the inner diameter at the connection of the lower part of the fluid passage I; the size of the misaligned translation opening between the diameter of the large diameter end (602) and the diameter of the lower part of the fluid passage I is used to adjust the flow rate of the fluid passage III of the emergency bolt (5). One end of the horizontal fluid passage Ⅲ of the emergency bolt (5) is coaxially and rotatably fitted with an adjusting bolt (10) through the internally threaded portion made; a steel ball Ⅱ (9) is fixed at the screwing end of the adjusting bolt (10); the other end of the horizontal fluid passage Ⅲ of the emergency bolt (5) is provided with a vertical fluid passage Ⅶ vertically communicating with the fluid passage Ⅲ; the valve body (3) is provided with a vertical fluid passage Ⅳ parallel to the fluid passage Ⅰ; the upper end of the fluid passage Ⅳ vertically communicates with the horizontal fluid passage Ⅴ in the T-shaped fluid passage of the valve body (3); the lower end of the fluid passage Ⅳ communicates with the fluid passage Ⅶ of the emergency bolt (5); a steel ball Ⅱ (9) is provided at the transition between the vertical fluid passage Ⅶ and the horizontal fluid passage Ⅲ of the emergency bolt (5); the steel ball Ⅱ (9) is used to conduct or cut off the passage between the fluid passage Ⅲ and the fluid passages Ⅶ, Ⅳ, and Ⅴ by manually adjusting the adjusting bolt (10).

2. The emergency high-pressure hydraulic check valve according to claim 1, characterized in that: The horizontal fluid passage Ⅱ of the return bolt (1) includes a B port at one end and a C port at the other end; the horizontal fluid passage Ⅲ of the emergency bolt (5) includes a D port at one end; the horizontal fluid passage Ⅴ in the T-shaped fluid passage of the valve body (3) has an A port; the A port and the B port are connected to the pump station; the C port is connected to the rod chamber of the oil cylinder; the D port is connected to the rodless chamber of the oil cylinder.

3. The emergency high-pressure hydraulic check valve according to claim 1, wherein: A locking nut (501) for rotatably fitting and locking the position of the emergency bolt (5).

4. The emergency high-pressure hydraulic check valve according to claim 1, wherein: A boss (301) is provided in the vertical fluid passage Ⅰ of the T-shaped fluid passage of the valve body (3); the boss (301) is provided between the horizontal fluid passage Ⅴ in the T-shaped fluid passage of the valve body (3) and the horizontal fluid passage Ⅲ of the emergency bolt (5); a steel ball Ⅰ (7) is provided at the boss (301); the steel ball Ⅰ (7) is used to seal and cut off or conduct the passage between the fluid passage Ⅲ and the fluid passage Ⅴ.

5. The emergency high-pressure hydraulic check valve according to claim 1, characterized in that: A pressure increasing chamber (302) is provided in the middle of the vertical fluid passage Ⅰ of the T-shaped fluid passage of the valve body (3); the diameter of the pressure increasing chamber (302) is larger than the diameter of the fluid passage Ⅱ; a piston assembly (2) is provided in the pressure increasing chamber (302).

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