Electro-hydraulic actuator of marine safety net device

Abstract

The utility model relates to an electro-hydraulic actuator of a safety net device for a ship. The structure is compact, and the self-locking oil cylinder, the power unit and the oil tank are integrated and sequentially connected through bolts in a linear series connection mode. The power unit integrates components such as a motor, a pump, an overflow valve, a hydraulic control one-way valve, a one-way throttle valve and a heater. The device adopts a full-sealed structure and is applied to an open-air marine environment. The control valve is packaged in the central valve block, and the outside is blocked by a sealing plug screw; the motor is packaged in a cylinder head of the self-locking oil cylinder, the hydraulic pump, the oil return pipe, the oil suction pipe and the heater are packaged in the oil tank, and sealing pieces are arranged at joints. The safety net has a mechanical self-locking function, so that the safety net is in a self-locking state when the safety net is erected at ordinary times, and the safety of personnel is guaranteed. Control is flexible, all the electro-hydraulic actuators are independently controlled and do not interfere with one another, and use of other actuators is not affected when one electro-hydraulic actuator breaks down. The electro-hydraulic actuator adopts a modular design, only cables need to be laid, and construction is convenient.

Description

Technical Field

[0001] This utility model relates to a safety net device in the field of marine machinery, and in particular to an electro-hydraulic actuator for a marine safety net device. Background Technology

[0002] Marine safety nets are installed along the sides of the deck to protect personnel and important equipment from being thrown overboard. Depending on the deck size, dozens to several dozen safety net units are typically installed. During operations, all safety nets must be lowered; otherwise, they are kept upright to ensure personnel safety.

[0003] Traditional marine safety net devices include: manual safety net devices, mechanical safety net devices, and hydraulic safety net devices. Their power actuators are divided into purely manual deployment and retrieval, gearbox, and hydraulic cylinder.

[0004] The use of manual placement and retrieval requires that the size of the space frame should not be too large, and that a high level of operational force is required, which makes it impossible to guarantee safety.

[0005] The safety net unit is retracted and extended by driving the gearbox with an operating handle. The automation level is insufficient, the operation is time-consuming, labor-intensive and time-consuming, and the maintenance workload is large.

[0006] The safety net unit is driven by a hydraulic pump station to extend and retract, which is highly automated. However, the structure is relatively complex, the pipeline layout is labor-intensive and time-consuming, the hydraulic pump station occupies cabin space, has a high failure rate due to oil leakage, and maintenance and management are time-consuming and labor-intensive. Moreover, failure of the hydraulic pump station or pipeline will affect the operation of the entire system.

[0007] In view of the defects of the existing safety net devices, the designer, through continuous research, design, repeated trials and improvements, has finally created this utility model with practical value. Summary of the Invention

[0008] The purpose of this invention is to overcome the shortcomings of existing safety net devices and provide a novel electro-hydraulic actuator for marine safety net devices. The technical problem to be solved is to make its control more flexible. Each safety net unit can be controlled independently, or, as needed, all or some areas can be linked for rapid deployment and retraction, thus making it more suitable for practical use.

[0009] Another objective of this invention is to provide an electro-hydraulic actuator for a marine safety net device, addressing the technical problem of ensuring consistent operation. The lowering and erecting movements are performed at essentially the same speed, making it more practical for everyday use.

[0010] Another objective of this invention is to provide an electro-hydraulic actuator for a marine safety net device. The technical problem to be solved is that it saves marine space and is easy to install. It eliminates the need for piping and simplifies interfaces, thus making it more practical.

[0011] Another objective of this invention is to provide an electro-hydraulic actuator for a marine safety net device, the technical problem to be solved being its high reliability and low oil leakage rate.

[0012] The purpose of this utility model and the technical problem it solves are achieved by the following technical solution. According to this utility model, a marine safety net device electro-hydraulic actuator mainly includes: a main hydraulic cylinder, a power unit, and an oil tank integrated into one unit, with only one oil pipe on the right side of the main body. The main hydraulic cylinder, power unit, and oil tank are sequentially connected by bolts in a straight series connection. Sealing elements are provided between each mounting surface of the main hydraulic cylinder, power unit, and oil tank. All other pipelines are embedded in the structure through channels.

[0013] Furthermore, the main hydraulic cylinder is composed of an ear ring, piston rod, end cap, cylinder barrel, piston, self-locking device, cylinder head, and oil pipe; the ear ring, piston rod, end cap, cylinder barrel, piston, and self-locking device are connected end to end in sequence, wherein one end of the oil pipe is set on the cylinder head, and the other end of the oil pipe is set on the cylinder barrel and connected to the rod chamber. The self-locking device is set at the extreme position of the main hydraulic cylinder in the retracted state. The chamber on the left side of the piston connected to the piston rod is the rod chamber of the hydraulic cylinder, and the right side of the piston is the rodless chamber of the hydraulic cylinder. The rod chamber of the hydraulic cylinder is connected to the oil pipe.

[0014] Furthermore, the power unit consists of a motor, a central valve block, a hydraulic pump, a heater, a one-way throttle valve, a hydraulically controlled one-way valve, a filter screen, a rodless chamber relief valve, a rod chamber relief valve, a sealing plug, an oil suction pipe, and an oil return pipe. Among them, the motor, hydraulic pump, relief valve, hydraulically controlled one-way valve, one-way throttle valve, and heater in the power unit are all mounted on the central valve block using the central valve block as the mounting carrier. The motor and hydraulic pump are respectively mounted on both sides of the central valve block. A central through hole is provided in the central valve block. The motor is built into the cylinder head of the main cylinder. The output shaft of the motor is directly connected to the drive shaft of the hydraulic pump. The mounting surfaces of the motor and the hydraulic pump are equipped with seals. The oil suction pipe, oil return pipe, and hydraulic pump are all installed on the same side of the central valve block. When the power unit is connected to the oil tank by bolts, the oil suction pipe, oil return pipe, and hydraulic pump will be placed inside the oil tank.

[0015] A miniature heater is installed in the oil tank and mounted on the central valve block. The heating zone of the heater extends into the oil inside the tank, and both the heater and the mounting surface of the central valve block are equipped with seals.

[0016] A one-way throttle valve is installed inside the power unit. The single-phase throttle valve is encapsulated inside the central valve block, and the outside of the single-phase throttle valve is sealed with a sealing plug.

[0017] A hydraulically controlled check valve is installed inside the power unit. The hydraulically controlled check valve is arranged laterally on both sides and runs through the central valve block. The one-way throttle valve is connected to the left side of the hydraulically controlled check valve and is connected to the rod chamber of the oil cylinder. The right side of the hydraulically controlled check valve is connected to the rodless chamber of the oil cylinder. The hydraulically controlled check valve is encapsulated inside the central valve block and sealed with a sealing plug. The filter screen is located in the oil passage of the rodless chamber of the oil cylinder in the central valve block.

[0018] The power unit is equipped with two relief valves: a rodless chamber relief valve and a rod chamber relief valve. The rodless chamber relief valve and the rod chamber relief valve serve as safety valves for the rodless chamber oil circuit and the rod chamber oil circuit of the cylinder, respectively. Both the rodless chamber relief valve and the rod chamber relief valve are encapsulated inside the central valve block and sealed with sealing plugs on the outside. All exposed oil ports on the outside of the central valve block are equipped with sealing plugs.

[0019] Furthermore, the oil tank includes a hinged support lug, an oil inlet plug, a liquid level port plug, and a tank body;

[0020] The oil tank is equipped with a level port and an oil filling port. The level port is located to the left of the oil filling port. The oil filling port is sealed with an oil filling port plug, and the level port is sealed with a level port plug. Hinged lugs are provided on the left and right sides of the oil tank as mounting interfaces for the electro-hydraulic actuator, which are connected to the base via pins.

[0021] This invention has significant advantages and beneficial effects compared with the prior art. It has at least the following advantages: more flexible control. Each safety net unit can be controlled independently, or, as needed, all or parts of the net can be linked for rapid deployment and retraction.

[0022] 1. More flexible control. Each safety net unit can be controlled independently, or it can be rapidly extended or retracted in conjunction with all or all areas as needed;

[0023] 2. Good consistency of movements. The speed of lowering and standing up is basically the same;

[0024] 3. Saves marine space. Eliminates the need for hydraulic pump stations;

[0025] 4. Easy to install. No piping required;

[0026] 5. Simplified interface. The external control installation interface requires only one control cable for connection to the external system;

[0027] 6. High security. Equipped with a mechanical locking function, the safety net can be reliably locked when it is in the upright position, ensuring personnel safety;

[0028] 7. High degree of automation. One-button electronic control improves equipment efficiency and reduces manual labor.

[0029] 8. High independence. Each safety network is independent of the others; a failure in one network will not affect the performance of other safety networks.

[0030] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of this utility model.

[0032] Figure 2 This is a schematic diagram of the main hydraulic cylinder structure of this utility model.

[0033] Figure 3A This is a schematic diagram of the power unit structure of this utility model.

[0034] Figure 3B This is a utility model Figure 3A AA sectional view.

[0035] Figure 4 This is a schematic diagram of the fuel tank structure of this utility model.

[0036] Explanation of icon numbers

[0037] 1. Main hydraulic cylinder

[0038] 1-1: Earrings 1-2: Piston Rod

[0039] 1-3: End cap; 1-4: Cylinder barrel

[0040] 1-5: Piston; 1-6: Self-locking device

[0041] 1-7: Cylinder head; 1-8: Oil pipe

[0042] 2. Power Unit

[0043] 2-1: Motor 2-2: Central valve block

[0044] 2-3: Hydraulic pump 2-4: Heater

[0045] 2-5: One-way throttle valve; 2-6: Hydraulic control one-way valve

[0046] 2-7: Filter screen; 2-8-1: Rodless chamber overflow valve

[0047] 2-8-2: Rod-type chamber relief valve; 2-9: Sealing plug.

[0048] 2-10: Oil suction pipe; 2-11: Oil return pipe

[0049] 3. Fuel tank

[0050] 3-1: Hinge lug; 3-2: Oil filler plug

[0051] 3-3: Liquid level port screw plug 3-4: Tank body

[0052] 4. Bolts Detailed Implementation

[0053] To further illustrate the technical means and effects adopted by this utility model to achieve the intended purpose of the invention, the following describes in detail the specific implementation, structure, features and effects of an electro-hydraulic actuator for a marine safety net device proposed according to this utility model, in conjunction with the accompanying drawings and preferred embodiments.

[0054] Please see Figure 1 As shown, a preferred embodiment of the present invention provides an electro-hydraulic actuator for a marine safety net device, designed to meet the requirements of use in open marine environments. It mainly comprises: a main hydraulic cylinder 1, a power unit 2, and an oil tank 3 integrated into one unit. The main hydraulic cylinder 1, power unit 2, and oil tank 3 are sequentially connected in a straight series connection via bolts 4. Sealing elements are provided between each mounting surface of the main hydraulic cylinder 1, power unit 2, and oil tank 3 to ensure sealing performance. To simplify the structure and reduce oil leakage, the electro-hydraulic actuator has only one oil pipe located on the right side of the actuator; all other pipes are integrated into the structure through channels.

[0055] See Figure 2 As shown, the main hydraulic cylinder 1 has a mechanical self-locking function in the retracted state to meet the mechanical self-locking requirement of the safety net unit in the erected state. The main hydraulic cylinder 1 consists of an ear ring 1-1, a piston rod 1-2, an end cap 1-3, a cylinder barrel 1-4, a piston 1-5, a self-locking device 1-6, a cylinder head 1-7, and an oil pipe 1-8. The ear ring 1-1, piston rod 1-2, end cap 1-3, cylinder barrel 1-4, piston 1-5, and self-locking device 1-6 are connected end to end in sequence. One end of the oil pipe 1-8 is set on the cylinder head 1-7, and the other end of the oil pipe 1-8 is set on the cylinder barrel 1-4 and connected to the rod chamber of the hydraulic cylinder. The self-locking device 1-6 is set at the extreme position of the main hydraulic cylinder 1 in the retracted state.

[0056] like Figure 2 As shown, the chamber on the left side of piston 1-5 connected to piston rod 1-2 is the rod chamber of the cylinder, and the chamber on the right side of piston 1-5 is the rodless chamber of the cylinder. The rod chamber is connected to oil pipe 1-8.

[0057] See Figure 3A and Figure 3BAs shown, the power unit 2 consists of a motor 2-1, a central valve block 2-2, a hydraulic pump 2-3, a heater 2-4, a one-way throttle valve 2-5, a hydraulically controlled one-way valve 2-6, a filter screen 2-7, a rodless chamber overflow valve 2-8-1, a rod chamber overflow valve 2-8-2, a sealing plug 2-9, an oil suction pipe 2-10, and an oil return pipe 2-11. Among them, the motor 2-1, hydraulic pump 2-3, overflow valve 2-8, hydraulically controlled one-way valve 2-6, one-way throttle valve 2-5, and heater 2-4 in the power unit 2 are all mounted on the central valve block 2-2 with the central valve block 2-2 as the mounting carrier. The motor 2-1 and the hydraulic pump 2-3 are respectively mounted on both sides of the central valve block 2-2. A central through hole is provided in the central valve block 2-2. The motor 2-1 is built into the cylinder head 1-7 of the main cylinder 1.

[0058] The output shaft of motor 2-1 is directly connected to the drive shaft of hydraulic pump 2-3. Seals are installed on the mounting surfaces of both motor 2-1 and hydraulic pump 2-3 to ensure isolation between the two chambers. The suction pipe 2-10, return pipe 2-11, and hydraulic pump 2-3 are all installed on the same side of the central valve block 2-2. After the power unit 2 is connected to the oil tank 3 via bolts 4, the suction pipe 2-10, return pipe 2-11, and hydraulic pump 2-3 will be placed inside the oil tank 3.

[0059] To meet the requirements of ambient temperature operation, a miniature heater 2-4 is installed in the oil tank 3. The heater 2-4 is mounted on the central valve block 2-2. After the power unit 2 is connected to the oil tank 3 by bolts 4, the heating zone of the heater 2-4 extends into the oil inside the oil tank 3. When the ambient temperature is too low, the oil can be heated by the heater 2-4. Both the mounting surfaces of the heater 2-4 and the central valve block 2-2 are equipped with seals to ensure sealing performance.

[0060] A one-way throttle valve 2-5 is installed inside the power unit 2 to regulate the flow rate and ensure smooth operation of the grid structure when it is lowered. The one-way throttle valve 2-5 is encapsulated inside the central valve block 2-2, and the outside of the one-way throttle valve 2-5 is sealed with a sealing plug to ensure sealing performance.

[0061] A hydraulically controlled check valve 2-6 is installed inside the power unit 2. When the electro-hydraulic actuator performs a retraction action, it can divert excess oil from the rodless chamber of the cylinder to the oil tank 3. The hydraulically controlled check valve 2-6 is arranged laterally through the central valve block 2-2. The one-way throttle valve 2-5 is connected to the left side of the hydraulically controlled check valve 2-6 and extends to the rod chamber of the cylinder. The right side of the hydraulically controlled check valve 2-6 extends to the rodless chamber of the cylinder. The hydraulically controlled check valve 2-6 is encapsulated inside the central valve block 2-2, and the outside of the hydraulically controlled check valve 2-6 is sealed with a sealing plug 2-9.

[0062] Filter 2-7 is located in the oil passage of the rodless chamber of the oil tank in the central valve block 2-2. Oil flowing out of the central valve block 2-2 to the rodless chamber of the cylinder and back to the central valve block 2-2 both pass through filter 2-7. Filter 2-7 is installed to filter impurities in the system and prevent them from entering the hydraulic pump.

[0063] The power unit 2 is equipped with two relief valves: a rodless chamber relief valve 2-8-1 and a rod chamber relief valve 2-8-2. The rodless chamber relief valve 2-8-1 and the rod chamber relief valve 2-8-2 serve as safety valves for the rodless and rod chamber oil circuits of the cylinder in the power unit 2, respectively. Both valves are encapsulated inside the central valve block 2-2 and sealed externally with sealing plugs 2-9. All exposed oil ports on the outside of the central valve block 2-2 are fitted with sealing plugs 2-9.

[0064] See Figure 4 To adapt to the marine environment and protect the hydraulic oil from contamination, a sealed oil tank 3 is used to isolate the hydraulic oil from the outside air. The oil tank 3 includes a hinged lug 3-1, an oil inlet plug 3-2, a liquid level port plug 3-3, and a tank body 3-4.

[0065] Oil tank 3 is equipped with a liquid level port and an oil filling port. Figure 4 As shown, the oil level port is located to the left of the oil inlet. Normally, the oil inlet is sealed with the oil inlet plug 3-2, and is only opened when oil is added. The oil level port is sealed with the oil level plug 3-3. Hinged lugs 3-1 are provided on the left and right sides of the oil tank 3 as the installation interface of the electro-hydraulic actuator, which is connected to the base through a pin.

[0066] The working principle of the above embodiment is as follows: The main cylinder 1 retracts: High-pressure oil in the rod chamber passes through the one-way throttle valve 2-5 and flows to the rod chamber of the cylinder, causing the main cylinder 1 to retract. Simultaneously, high-pressure oil in the rod chamber of the central valve block 2-2 pushes the valve core 2-5 of the hydraulically controlled one-way valve to the right. A portion of the oil returning from the rodless chamber flows to the suction chamber of the hydraulic pump 2-3, while the excess oil from the rod chamber flows back to the oil tank after passing through the hydraulically controlled one-way valve 2-6. The rod chamber relief valve 2-8-2 functions to establish the system pressure for the cylinder retraction action.

[0067] Main cylinder 1 extension action: High-pressure oil from the rodless chamber is supplied to the rodless chamber of the main cylinder, causing main cylinder 1 to extend. Oil return from the rod chamber passes through the one-way throttle valve 2-5 and then flows to the suction chamber 2-3 of the hydraulic pump. The relief valve 2-8-1 in the rodless chamber functions to establish the system pressure for the cylinder extension action.

[0068] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

[0069] Furthermore, the above examples include sequential exemplary steps, but these steps need not be performed in the order shown. Performing these steps in different orders is within the scope of this invention. Within the spirit and scope of the embodiments of this utility model, these steps may be added, substituted, changed in order, and / or omitted as appropriate.

[0070] Although the present invention has been disclosed above with reference to embodiments, it is not intended to limit the scope of the invention. Any person skilled in the art can make various modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of protection of the present invention shall be determined by the claims.

Claims

1. An electro-hydraulic actuator for a marine safety net arrangement, characterized by: It mainly includes: The main oil cylinder (1), power unit (2), oil tank (3) integrated in one body and only one oil pipe is arranged on the right side of the body, the main oil cylinder (1), power unit (2), oil tank (3) are sequentially connected by bolts (4), and are linearly connected in series, and sealing elements are arranged between the mounting surfaces of the main oil cylinder (1), power unit (2) and oil tank (3), and the remaining pipelines are arranged in the structure through the hole. The main oil cylinder (1) is composed of an ear ring (1-1), a piston rod (1-2), an end cover (1-3), a cylinder barrel (1-4), a piston (1-5), a self-locking device (1-6), a cylinder head (1-7) and an oil pipe (1-8). The ear ring (1-1), the piston rod (1-2), the end cover (1-3), the cylinder barrel (1-4), the piston (1-5) and the self-locking device (1-6) are sequentially connected end to end, wherein one end of the oil pipe (1-8) is arranged on the cylinder head (1-7), the other end of the oil pipe (1-8) is arranged on the cylinder barrel (1-4) and connected to the rod cavity of the oil cylinder, the self-locking device (1-6) is arranged at the limit position of the retracted state of the main oil cylinder (1), the chamber connected with the piston rod (1-2) on the left side of the piston (1-5) is the rod cavity of the oil cylinder, the right side of the piston (1-5) is the rodless cavity of the oil cylinder, and the rod cavity of the oil cylinder is communicated with the oil pipe (1-8).

2. The electro-hydraulic actuator for a marine safety net device according to claim 1, characterized in that: The power unit (2) is composed of a motor (2-1), a center valve block (2-2), a hydraulic pump (2-3), a heater (2-4), a one-way throttle valve (2-5), a hydraulic control one-way valve (2-6), a filter screen (2-7), a rodless cavity overflow valve (2-8-1), a rod cavity overflow valve (2-8-2), a sealing plug (2-9), an oil suction pipe (2-10) and an oil return pipe (2-11), wherein the motor (2-1), the hydraulic pump (2-3), the overflow valve (2-8), the hydraulic control one-way valve (2-6), the one-way throttle valve (2-5) and the heater (2-4) in the power unit (2) are all installed on the center valve block (2-2) as an installation carrier, and are assembled on the center valve block (2-2), and the motor (2-1) and the hydraulic pump (2-3) are respectively installed on both sides of the center valve block (2-2), a center through hole is arranged on the center valve block (2-2), the motor (2-1) is arranged in the cylinder head (1-7) of the main oil cylinder (1), the output shaft of the motor (2-1) is directly connected with the transmission shaft of the hydraulic pump (2-3), sealing elements are arranged on the installation surfaces of the motor (2-1) and the hydraulic pump (2-3), the oil suction pipe (2-10), the oil return pipe (2-11) and the hydraulic pump (2-3) are all installed on the same side of the center valve block (2-2), and when the power unit (2) is connected with the oil tank (3) through the bolts (4), the oil suction pipe (2-10), the oil return pipe (2-11) and the hydraulic pump (2-3) will be arranged in the oil tank (3); 3. The electro-hydraulic actuator for a marine safety net device according to claim 1, characterized in that: A micro heater (2-4) is arranged in the oil tank (3), the heater (2-4) is installed on the center valve block (2-2), the heating area of the heater (2-4) is arranged in the oil liquid in the oil tank (3), and sealing elements are arranged on the installation surfaces of the heater (2-4) and the center valve block (2-2). ​ A one-way throttle valve (2-5) is arranged inside the power unit (2), the one-way throttle valve (2-5) is encapsulated inside the center valve block (2-2), the one-way throttle valve (2-5) is blocked outside by a sealing screw plug; A hydraulic control one-way valve (2-6) is arranged inside the power unit (2), the hydraulic control one-way valve (2-6) is arranged transversely and penetrates the center valve block (2-2), the one-way throttle valve (2-5) is communicated with the left side of the hydraulic control one-way valve (2-6) and connected to the rod cavity of the oil cylinder, the right end of the hydraulic control one-way valve (2-6) is connected to the rodless cavity of the oil cylinder, the hydraulic control one-way valve (2-6) is encapsulated inside the center valve block (2-2), the hydraulic control one-way valve (2-6) is blocked outside by a sealing screw plug (2-9), and a filter screen (2-7) is arranged in the rodless cavity oil channel of the center valve block (2-2); Two overflow valves, i.e., a rodless cavity overflow valve (2-8-1) and a rod cavity overflow valve (2-8-2), are arranged inside the power unit (2), the rodless cavity overflow valve (2-8-1) and the rod cavity overflow valve (2-8-2) are respectively used as safety valves of the rodless cavity oil circuit and the rod cavity oil circuit of the power unit (2), the rodless cavity overflow valve (2-8-1) and the rod cavity overflow valve (2-8-2) are both encapsulated inside the center valve block (2-2) and blocked outside by a sealing screw plug (2-9), and a sealing screw plug (2-9) is arranged on each exposed oil port outside the center valve block (2-2).

4. The electro-hydraulic actuator for a marine safety net device according to claim 1, characterized in that: The oil tank (3) comprises hinged ears (3-1), an oil filling port screw plug (3-2), a liquid level oil port screw plug (3-3), and a tank body (3-4); The oil tank (3) is provided with a liquid level oil port and an oil filling port, the liquid level oil port is located on the left side of the oil filling port, the oil filling port is blocked by the oil filling port screw plug (3-2), the liquid level oil port is blocked by the liquid level oil port screw plug (3-3), and the oil tank (3) is provided with hinged ears (3-1) on the left and right sides, which are used as mounting interfaces of the electro-hydraulic actuator and are connected to the base through a pin shaft.

Images