Submersible cylinder

Abstract

The invention discloses an underwater oil cylinder, comprising a cylinder body, a cylinder bottom, a piston and a piston rod. The underwater oil cylinder is equipped with a linear displacement sensor for measuring the stroke of the piston, and an electronic compartment for accommodating a sensor body is provided in the cylinder bottom; a first flow channel connecting the electronic compartment and the outer wall of the cylinder bottom is provided in the cylinder bottom, and the electronic compartment and the first flow channel are filled with electronic fluoride liquid, and a plunger type equalizing pressure valve is installed in the first flow channel, and the plunger type equalizing pressure valve comprises a valve body and a plunger valve core, a columnar channel is provided in the valve body, and the two ends of the columnar channel are respectively used as an inner port and an outer port, and the plunger valve core is installed in the columnar channel, and a limit assembly is provided in the columnar channel to prevent the plunger valve core from coming out, and the plunger valve core abuts against the limit assembly near the outer port under the action of the electronic fluoride liquid. The oil cylinder has a piston stroke test function, and overcomes the insulation problem of underwater operation of electronic components of the piston stroke test device, has good waterproof performance, and can better adapt to underwater construction conditions.

Description

Technical Field

[0001] The invention belongs to the technical field of hydraulic machinery, and in particular relates to an underwater oil cylinder. Background Art

[0002] The oil cylinder, also known as the hydraulic jack, is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion. It is a commonly used construction equipment for pushing or lifting. At present, the pulling force required for sinking and pulling of immersed tube tunnels is large, and oil cylinders are mostly used for pulling and pulling operations. In order to ensure the accuracy of tunnel construction, the oil cylinders used in underwater immersed tube tunnel construction need to measure the working stroke.

[0003] However, the construction of immersed tube tunnels is done underwater on the seabed and has a long construction period. The waterproofness of ordinary oil cylinders and the measuring device used to measure the stroke of the oil cylinder piston rod cannot meet the construction requirements, especially for the electronic components of the stroke measuring device (such as displacement sensors, etc.). It is difficult to ensure the insulation and stability of the electronic components working underwater. At the same time, the piston rod of the oil cylinder is easily corroded by seawater during long-term underwater operation, causing equipment quality problems, affecting the service life of the equipment and the construction process. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention proposes an underwater oil cylinder with a piston stroke test function, which overcomes the insulation problem of electronic components of a piston stroke test device during underwater operation, has good waterproof performance, and can better adapt to underwater construction conditions.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] An underwater oil cylinder comprises a cylinder body, a cylinder bottom, a piston which is slidably sealed with the inner wall of the cylinder body, and a piston rod connected to the piston, wherein the underwater oil cylinder is equipped with a linear displacement sensor for measuring the stroke of the piston, and an electronic compartment for accommodating a sensor body of the linear displacement sensor is provided in the cylinder bottom; a first flow channel which is connected to the electronic compartment and the outer wall of the cylinder bottom is provided in the cylinder bottom, the electronic compartment and the first flow channel are filled with electronic fluoride liquid, a plunger-type pressure equalizing valve is installed in the port of the first flow channel which is provided on the outer wall of the cylinder bottom, and the plunger-type The pressure equalizing valve includes a valve body and a plunger valve core. A cylindrical channel is provided in the valve body. The cylindrical channel is opened at both ends, and two ports of the cylindrical channel are respectively provided inside and outside the first flow channel to serve as an inner port and an outer port of the cylindrical channel. The plunger valve core is installed in the cylindrical channel, and the plunger valve core is slidably sealed with the inner wall of the cylindrical channel. The cylindrical channel is provided with a limiting component to prevent the plunger valve core from escaping from the cylindrical channel. The plunger valve core abuts against the limiting component close to the outer port under the action of the electronic fluorinated liquid.

[0007] Preferably, the bottom of the cylinder is further provided with a connecting hole connecting the electronic compartment and the internal space of the cylinder body, and the test end of the linear displacement sensor penetrates into the cylinder body from the connecting hole to test the stroke of the piston, and the test end is sealed and connected to the connecting hole to prevent the electronic fluoride liquid from entering the cylinder body.

[0008] Preferably, the linear displacement sensor adopts a magnetostrictive displacement sensor, a measuring rod of the magnetostrictive displacement sensor penetrates into the cylinder body from the connecting hole, a first sealing member for closing the gap between the connecting hole and the measuring rod is provided between the connecting hole and the measuring rod, the central axis of the measuring rod is arranged parallel to the central axis of the piston rod, the magnetic ring sleeved on the measuring rod is arranged in the cylinder body, and the magnetic ring is fixedly connected to the piston or piston rod.

[0009] Preferably, the measuring rod is arranged colinearly with the center axis of the piston rod, the piston and the piston rod are provided with a measuring rod mounting groove for passing the measuring rod, the end surface of the piston close to the cylinder bottom is provided with a magnetic ring mounting groove for mounting the magnetic ring, and the magnetic ring is fixedly mounted in the magnetic ring mounting groove.

[0010] Preferably, a cable channel for passing the cable of the magnetostrictive displacement sensor is provided at the bottom of the cylinder, and the cable is sealed and connected to the cable channel to prevent the electronic fluoride liquid from flowing out of the bottom of the cylinder.

[0011] Preferably, the cylinder bottom is provided with a second flow channel connecting the electronic compartment and the outer wall of the cylinder bottom, the port of the second flow channel arranged on the outer wall of the cylinder bottom is provided with a sealing cover for sealing the port, and the second flow channel is filled with electronic fluoride liquid.

[0012] Preferably, at least one first sealing member is provided between the cylinder bottom and the cylinder body for sealing a gap therebetween.

[0013] Preferably, a plurality of first sealing members for sealing the gap between the piston and the inner wall of the cylinder body are provided.

[0014] Preferably, at least one first sealing member for sealing a gap between the piston rod and the piston rod outlet of the cylinder body is provided.

[0015] Preferably, the piston rod surface is plated with a nickel anti-corrosion layer.

[0016] Preferably, the outer surface of the nickel-plated anti-corrosion layer is plated with a hard chromium wear-resistant layer.

[0017] Preferably, the electronic fluorination liquid is 3M fluorination liquid.

[0018] Preferably, the limiting assembly includes a first limiting component arranged near the inner port of the cylindrical channel to prevent the plunger valve core from escaping from the inner port, and a second limiting component arranged near the outer port of the cylindrical channel to prevent the plunger valve core from escaping from the outer port.

[0019] Preferably, the first limiting component includes the retaining ring fixedly mounted on the inner wall of the cylindrical channel, and the second limiting component includes a valve cover fixedly mounted on the outer port of the cylindrical channel, and the valve cover is provided with a connecting hole connecting the cylindrical channel and the external water environment.

[0020] Preferably, a second sealing member is fixedly mounted on the outer side wall of the plunger valve core, and the second sealing member is used for sealing the gap between the plunger valve core and the inner wall of the cylindrical channel.

[0021] Preferably, the second sealing member is provided in plurality.

[0022] Preferably, the plunger type pressure equalizing valve is installed in the first flow channel through an elastic retaining ring.

[0023] Compared with the prior art, the beneficial effects of the present invention are: an underwater oil cylinder is proposed, which has a piston stroke test function and overcomes the insulation problem of the electronic components of the piston stroke test device during underwater operation, has good waterproof performance, and can better adapt to underwater construction conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a cross-sectional view of the underwater oil cylinder of this embodiment;

[0025] Figure 2 for Figure 1 A magnified view of part A;

[0026] Figure 3 This is a schematic diagram of the underwater cylinder structure of this embodiment;

[0027] Figure 4 Schematic diagram of the structure of the plunger type pressure equalizing valve of this embodiment. DETAILED DESCRIPTION

[0028] The present invention is described in detail below by way of exemplary embodiments. However, it should be understood that elements, structures, and features in one embodiment may also be beneficially combined in other embodiments without further description.

[0029] It should be noted that, in the description of the present invention, the directions or positional relationships indicated by terms such as “inside”, “outside”, “up”, “down”, “left”, “right”, “front” and “back” are based on the positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0030] like Figures 1 to 3 As shown, an underwater oil cylinder comprises a cylinder body 1, a cylinder bottom 2, a piston 4 which is slidably sealed with the inner wall of the cylinder body 1, and a piston rod 3 connected to the piston 4, the underwater oil cylinder is equipped with a linear displacement sensor for measuring the stroke of the piston 4, the cylinder bottom 2 is provided with an electronic compartment 5 for accommodating a sensor body 8 of the linear displacement sensor; the cylinder bottom 2 is provided with a first flow channel 6 which is connected to the electronic compartment 5 and the outer wall of the cylinder bottom 2, the electronic compartment 5 and the first flow channel 6 are filled with electronic fluoride liquid, the first flow channel 6 is provided in a port on the outer wall of the cylinder bottom 2 and a plunger-type equalizing pressure valve 7 is installed in the port to prevent the electronic fluoride liquid from flowing out of the cylinder bottom 2, The plunger type equalizing pressure valve 7 includes a valve body 71 and a plunger valve core 75. A cylindrical channel 73 is provided in the valve body 71. The cylindrical channel 73 is opened at both ends, and the two ports of the cylindrical channel 73 are respectively provided inside and outside the first flow channel 6 to serve as the inner port and outer port of the cylindrical channel 73. The plunger valve core 75 is installed in the cylindrical channel 73, and the plunger valve core 75 is slidably sealed with the inner wall of the cylindrical channel 73. The cylindrical channel 73 is provided with a limiting component to prevent the plunger valve core 75 from escaping from the cylindrical channel 73. The plunger valve core 75 abuts against the limiting component near the outer port under the action of the electronic fluorinated liquid.

[0031] In the above-mentioned underwater cylinder, the linear displacement sensor can test the stroke information of the piston 4, and the sensor body 8 containing the electronic components of the linear displacement sensor is installed in the electronic compartment 5 in the cylinder bottom 2, and the electronic compartment 5 is filled with electronic fluoride liquid, that is, the electronic components of the linear displacement sensor are immersed in the electronic fluoride liquid, which can isolate water from entering the electronic compartment to protect the electronic components, and when the underwater cylinder is operating underwater, the plunger-type equalizing pressure valve 7 can be used to ensure that the water pressure of the electronic compartment 5 and the external water pressure of the cylinder body 1 are balanced, and the plunger valve core 75 of the plunger-type equalizing pressure valve 7 will move toward the inner port direction close to the cylindrical channel 73 under the action of water pressure to compress the volume of the electronic fluoride liquid 5 in the cylinder bottom 1, increase the internal pressure of the electronic compartment 5, and realize the balanced exchange of the internal and external pressures of the electronic compartment 5. The electronic compartment 5 can also use the different densities of the electronic fluoride liquid and water to ensure the watertightness of the electronic compartment 5, ensure the insulation and stability of the underwater energized operation of the linear displacement sensor, and ensure the normal operation of the cylinder and the cylinder stroke test effect. In summary, the oil cylinder has a piston 4-stroke test function, and overcomes the insulation problem of underwater operation of electronic components of the linear displacement sensor used to test the piston 4-stroke. It has good waterproof performance and can better adapt to underwater construction conditions.

[0032] Specifically, the cylinder bottom 2 is also provided with a connecting hole connecting the electronic compartment 5 and the internal space of the cylinder body 1. The test end of the linear displacement sensor penetrates into the cylinder body 1 from the connecting hole to test the stroke of the piston 4. The test end is sealed and connected to the connecting hole to prevent the electronic fluorinated liquid from entering the cylinder body 1.

[0033] Specifically, the linear displacement sensor adopts a magnetostrictive displacement sensor 8, a measuring rod 81 of the magnetostrictive displacement sensor 8 penetrates into the cylinder body 1 from the connecting hole, a first sealing member for closing the gap between the connecting hole and the measuring rod 1 is provided, the central axis of the measuring rod 81 is arranged parallel to the central axis of the piston rod 3, a magnetic ring 82 sleeved on the measuring rod 81 is arranged in the cylinder body 1, and the magnetic ring 82 is fixedly connected to the piston 4 or the piston rod 3. The first sealing member can close the gap between the measuring rod 81 and the connecting hole to prevent the electronic fluoride liquid in the electronic compartment 5 from entering the cylinder body 1, the magnetic ring 82 is fixedly connected to the piston 4 or the piston rod 3, and the magnetic ring 82 can move with the piston 4 to measure the stroke of the piston 4.

[0034] Specifically, the measuring rod 81 is arranged colinearly with the central axis of the piston rod 3, the piston 4 and the piston rod 3 are provided with a measuring rod mounting groove 10 for passing the measuring rod 81, and the end surface of the piston 4 close to the cylinder bottom 2 is provided with a magnetic ring mounting groove for installing the magnetic ring 82, and the magnetic ring 82 is fixedly installed in the magnetic ring mounting groove.

[0035] Specifically, the cylinder bottom 2 is provided with a cable channel (not shown in the accompanying drawings) for passing the cable of the magnetostrictive displacement sensor 8, the cable channel connects the electronic compartment 5 and the outer wall of the cylinder bottom 2, and the cable is sealed to connect the cable channel to prevent the electronic fluoride liquid from flowing out of the cylinder bottom 2.

[0036] Specifically, the cylinder bottom 2 is provided with a second flow channel connecting the electronic compartment 5 and the outer wall of the cylinder bottom 2, and the port of the second flow channel provided on the outer wall of the cylinder bottom 2 is provided with a sealing cover 7 for sealing the port, and the second flow channel is filled with electronic fluoride liquid. The second flow channel is provided for filling the electronic compartment 5 with electronic fluoride liquid, which is convenient for equipment production and maintenance.

[0037] Specifically, at least one first seal 9 for sealing the gap between the cylinder bottom 2 and the cylinder body 1 is provided between the cylinder bottom 2 and the cylinder body 1. The first seal 9 is used to seal the hydraulic cylinder bottom 2 and the cylinder body 1 to prevent leakage of hydraulic oil in the cylinder body 1 and entry of external water.

[0038] Specifically, a plurality of first sealing members 9 for sealing the gap between the piston 4 and the inner wall of the cylinder body 1 are provided.

[0039] Specifically, at least one first seal 9 for sealing the gap between the piston rod 3 and the piston rod outlet of the cylinder body 1 is provided. The first seal 9 is used to seal the piston rod outlet and the piston rod 3 to prevent leakage of hydraulic oil in the cylinder body 1 and entry of external water.

[0040] Specifically, the cylinder body 1 includes a cylinder head provided with a piston rod outlet, the cylinder head and the inner wall of the cylinder body 1 connected thereto are provided with a matching threaded structure, the cylinder head is connected to the cylinder body 1 through the threaded structure, and a first sealing member is provided between the cylinder head and the inner wall of the cylinder body 1 for sealing the gap therebetween to prevent water from entering the threads and provide anti-corrosion protection.

[0041] Specifically, the surface of the piston rod 3 is plated with a nickel anti-corrosion layer.

[0042] Specifically, the outer surface of the nickel-plated anti-corrosion layer is plated with a hard chromium wear-resistant layer.

[0043] Specifically, the electronic fluoride liquid is 3M fluoride liquid.

[0044] Specifically, the limiting component includes a first limiting component arranged near the inner port of the cylindrical channel 73 to prevent the plunger valve core 75 from escaping from the inner port, and a second limiting component arranged near the outer port of the cylindrical channel 73 to prevent the plunger valve core 75 from escaping from the outer port.

[0045] Preferably, the first limiting component includes the retaining ring 72 fixedly mounted on the inner wall of the cylindrical channel 73, and the second limiting component includes a valve cover 76 fixedly mounted on the outer port of the cylindrical channel 73, and the valve cover 76 is provided with a connecting hole connecting the cylindrical channel 73 and the external water environment.

[0046] Preferably, a second sealing member 74 is fixedly mounted on the outer side wall of the plunger valve core 75 , and the second sealing member 74 is used for sealing the gap between the plunger valve core 75 and the inner wall of the cylindrical channel 73 .

[0047] Preferably, the number of the second sealing members 74 is plural.

[0048] Specifically, the plunger type pressure equalizing valve 7 is installed in the first flow channel 6 through an elastic retaining ring.

[0049] The above description is only a preferred embodiment of the present invention and does not limit the present invention in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes and apply it to other fields. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. An underwater oil cylinder, comprising a cylinder body, a cylinder bottom, a piston slidingly and sealingly matched with the inner wall of the cylinder body, and a piston rod connected to the piston, characterized in that: The underwater oil cylinder is equipped with a linear displacement sensor for measuring the stroke of the piston, and an electronic compartment for accommodating a sensor body of the linear displacement sensor is provided in the bottom of the cylinder; a first flow channel connecting the electronic compartment and the outer wall of the cylinder bottom is provided in the bottom of the cylinder, and the electronic compartment and the first flow channel are filled with electronic fluoride liquid, and a plunger-type equalizing pressure valve is installed in the port of the first flow channel arranged on the outer wall of the cylinder bottom, and the plunger-type equalizing pressure valve includes a valve body and a plunger valve core, a cylindrical channel is provided in the valve body, and openings are provided at both ends of the cylindrical channel, and two ports of the cylindrical channel are respectively provided inside and outside the first flow channel to serve as the inner port and outer port of the cylindrical channel, the plunger valve core is installed in the cylindrical channel, and the plunger valve core is slidably sealed with the inner wall of the cylindrical channel, and the cylindrical channel is provided with a limit assembly to prevent the plunger valve core from escaping from the cylindrical channel, and the plunger valve core abuts against the limit assembly close to the outer port under the action of the electronic fluoride liquid; The cylinder bottom is also provided with a connecting hole connecting the electronic compartment and the internal space of the cylinder body, and the test end of the linear displacement sensor penetrates into the cylinder body from the connecting hole to test the stroke of the piston, and the test end is sealed and connected to the connecting hole; The limiting assembly includes a first limiting component arranged near the inner port of the cylindrical channel to prevent the plunger valve core from escaping from the inner port, and a second limiting component arranged near the outer port of the cylindrical channel to prevent the plunger valve core from escaping from the outer port.

2. The underwater cylinder according to claim 1, characterized in that: The linear displacement sensor adopts a magnetostrictive displacement sensor, a measuring rod of the magnetostrictive displacement sensor penetrates into the cylinder body from the connecting hole, a first sealing member for closing the gap between the connecting hole and the measuring rod is provided, the central axis of the measuring rod is arranged parallel to the central axis of the piston rod, a magnetic ring sleeved on the measuring rod is arranged in the cylinder body, and the magnetic ring is fixedly connected to the piston or the piston rod.

3. The underwater cylinder according to claim 2, characterized in that: The measuring rod is arranged colinearly with the center axis of the piston rod, the piston and the piston rod are provided with a measuring rod mounting groove for passing the measuring rod, the end surface of the piston close to the cylinder bottom is provided with a magnetic ring mounting groove for mounting the magnetic ring, and the magnetic ring is fixedly mounted in the magnetic ring mounting groove.

4. The underwater cylinder according to claim 2, characterized in that: The bottom of the cylinder is provided with a cable channel for passing the cable of the magnetostrictive displacement sensor, and the cable is sealed and connected to the cable channel; the bottom of the cylinder is provided with a second flow channel connecting the electronic compartment and the outer wall of the cylinder bottom, and the port of the second flow channel arranged on the outer wall of the cylinder bottom is provided with a sealing cover for sealing the port, and the second flow channel is filled with electronic fluoride liquid.

5. The underwater cylinder according to claim 1, characterized in that: At least one first sealing member is provided between the cylinder bottom and the cylinder body for sealing the gap therebetween; at least one first sealing member is provided between the piston rod and the piston rod outlet of the cylinder body for sealing the gap therebetween.

6. The underwater cylinder according to claim 1, characterized in that: The piston rod surface is plated with a nickel anti-corrosion layer, and the outer surface of the nickel anti-corrosion layer is plated with a hard chrome wear-resistant layer; the electronic fluoride liquid is 3M fluoride liquid.

7. The underwater cylinder according to claim 1, characterized in that: The first limiting component includes a retaining ring fixedly mounted on the inner wall of the cylindrical channel, and the second limiting component includes a valve cover fixedly mounted on the outer port of the cylindrical channel, wherein the valve cover is provided with a through hole connecting the cylindrical channel and the external water environment.

8. The underwater cylinder according to claim 1, characterized in that: A second sealing member is fixedly mounted on the outer side wall of the plunger valve core, and the second sealing member is used to seal the gap between the plunger valve core and the inner wall of the cylindrical channel.

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