Oil way filtering protection device used during dustproof failure of hydraulic cylinder of deep well casting machine

Abstract

The utility model belongs to the technical field of filtration of a hydraulic system, and discloses an oil way filtration protection device used during dustproof failure of a hydraulic cylinder of a deep well casting machine, which is arranged between a rod cavity oil port of the hydraulic cylinder and a working oil port of a hydraulic valve stand, and comprises an oil inlet pipeline and an oil return pipeline which are connected in parallel, oil is controlled to flow to the hydraulic cylinder in one direction; a hydraulic oil filter and an oil return one-way valve are sequentially arranged on the oil return pipeline in series and used for filtering hydraulic oil flowing out of the rod cavity of the hydraulic cylinder and controlling the hydraulic oil to flow to the hydraulic valve stand in one direction. Optionally, a stop valve is arranged for isolating the oil way, and a pressure detection device is arranged for monitoring the state of the filter. When the dustproof function of the hydraulic cylinder fails, return oil is forcibly filtered, pollutants are effectively intercepted, a hydraulic valve stand is protected, a valve piece is prevented from being clamped and abraded, and the reliability of a system is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a hydraulic system filtration technical field especially relates to a kind of oil passage filtration protection device when dust failure of deep well casting machine hydraulic cylinder. BACKGROUND

[0002] In vertical deep well casting process, the hydraulic cylinder of casting machine is usually located in the casting well, and the working environment is high temperature, with much dust and slag accumulation. When the dust seal of hydraulic cylinder is damaged or the surface of piston rod is dropped, metal slag will enter the rod cavity of hydraulic cylinder with piston rod backstroke, and flow into the hydraulic system with back oil when piston rod is extended. Although the back oil filter element is generally set at the end of hydraulic system, the contaminated oil needs to pass through hydraulic valve table before reaching the filter element, which can easily cause the sticking, wear and even failure of directional valve and other valve parts, and further cause the machine to stop and cause significant economic losses. Therefore, a device capable of pre-filtering and one-way isolation of hydraulic valve table at the moment of pollution is needed. SUMMARY

[0003] The utility model aims at overcoming the deficiencies in the prior art, providing an oil passage filtration protection device for deep well casting machine hydraulic cylinder when dust failure, which can effectively isolate metal slag when the dustproof structure of hydraulic cylinder fails, protect the hydraulic valve table and avoid hydraulic valve sticking and wear.

[0004] To achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0005] An oil passage filtration protection device for deep well casting machine hydraulic cylinder when dust failure, comprising a hydraulic cylinder and a hydraulic valve table, an oil inlet pipe and an oil return pipe are connected in parallel between the rod cavity oil port of the hydraulic cylinder and the working oil port of the hydraulic valve table;A one-way inlet valve is arranged on the oil inlet pipe for controlling the one-way flow of hydraulic oil from the hydraulic valve table to the rod cavity of the hydraulic cylinder;A hydraulic oil filter and a back oil one-way valve are connected in series on the oil return pipe, the hydraulic oil filter is used to intercept impurities in hydraulic oil, and the back oil one-way valve is used to control the one-way flow of hydraulic oil from the rod cavity of the hydraulic cylinder to the hydraulic valve table;A stop valve is arranged between the rod cavity oil port of the hydraulic cylinder and the branch nodes of the oil inlet pipe and the oil return pipe for controlling the on-off of the rod cavity oil passage of the hydraulic cylinder.

[0006] Further, the inlet end and the outlet end of the hydraulic oil filter are connected to a pressure detection device for monitoring the pressure difference between the two ends of the hydraulic oil filter.

[0007] Further, the pressure detection device is a pressure switch or pressure sensor with signal output, which triggers an alarm signal when the pressure difference between the two ends of the hydraulic oil filter exceeds the set threshold.

[0008] Furthermore, both the inlet check valve and the return check valve are hydraulically controlled check valves or mechanical check valves.

[0009] Furthermore, the shut-off valve is a manual ball valve or a solenoid-controlled valve.

[0010] The beneficial effects of this utility model are:

[0011] This invention enables forced oil return through a hydraulic oil filter when the hydraulic cylinder's dustproof function fails and impurities enter the rod chamber. This effectively intercepts contaminants, preventing them from entering the hydraulic valve seat and protecting precision components such as directional valves from jamming and wear. The device, installed between the hydraulic cylinder and the valve seat, separates the inlet and outlet oil paths without altering the original control logic, ensuring normal operation of the hydraulic cylinder and good system compatibility. A pressure detection device monitors the hydraulic oil filter's blockage in real time and triggers an alarm, not only prompting filter replacement but also indirectly reflecting the hydraulic cylinder's dustproof status, providing a basis for preventative maintenance. The overall device has a compact structure, uses standard parts, is low-cost, and easy to install. The included shut-off valve isolates the oil circuit without shutting down the system, facilitating hydraulic oil filter maintenance. It is particularly suitable for deep-well hydraulic casting systems operating in harsh environments, significantly improving equipment reliability and reducing downtime. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model.

[0013] In the diagram: 1-Hydraulic cylinder; 2-Stop valve; 3-Inlet check valve; 4-Pressure switch; 5-Hydraulic oil filter; 6-Return check valve; 7-Hydraulic valve platform. Detailed Implementation

[0014] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0015] Please see Figure 1The embodiment provides an oil passage filtering protection device for preventing dust failure of a hydraulic cylinder of a deep well casting machine, which is arranged between a rod cavity oil port of the hydraulic cylinder 1 and a working oil port of a hydraulic valve table 7 for supplying and returning oil for the hydraulic cylinder 1. When being arranged, a pipeline is led out from the rod cavity oil port of the hydraulic cylinder 1, and a stop valve 2 is first connected. An outlet of the stop valve 2 is connected to a three-way joint. Two parallel pipelines are led out from the three-way joint, and are used as an oil inlet pipeline and an oil return pipeline respectively. The two pipelines are finally connected to the same working oil port of the hydraulic valve table 7. The working oil port is used as an oil inlet port and can be switched to an oil return port by a reversing valve in the valve table. An oil inlet check valve 3 is arranged on the oil inlet pipeline. The flow direction of the oil inlet check valve 3 is arranged to allow hydraulic oil to flow from the hydraulic valve table 7 to the rod cavity of the hydraulic cylinder 1 and prevent reverse flow. A hydraulic oil filter 5 and an oil return check valve 6 are arranged in sequence on the oil return pipeline. The hydraulic oil filter 5 is used to filter the hydraulic oil flowing out of the rod cavity of the hydraulic cylinder 1. The oil return check valve 6 is arranged after the hydraulic oil filter 5 relative to the oil return flow direction. The flow direction of the oil return check valve 6 is arranged to allow hydraulic oil to flow from the hydraulic oil filter 5 to the hydraulic valve table 7 and prevent reverse flow.

[0016] The working principle is as follows:

[0017] When the piston rod of the hydraulic cylinder 1 returns, the hydraulic valve table 7 supplies oil to the working oil port. The hydraulic oil flows through the oil inlet pipeline, passes through the oil inlet check valve 3, passes through the stop valve 2, enters the rod cavity of the hydraulic cylinder 1, and pushes the piston rod to retract into the rodless cavity. In this process, if the dust seal of the hydraulic cylinder is damaged or the piston rod surface is chipped, metal slag and other impurities will enter the rod cavity of the hydraulic cylinder 1 along with the piston rod, polluting the hydraulic oil in the rod cavity. Due to the reverse blocking effect of the oil return check valve 6, the hydraulic oil cannot pass through the oil return pipeline and the hydraulic oil filter 5.

[0018] When the piston rod of the hydraulic cylinder 1 extends, the hydraulic valve table 7 switches the working oil port to the oil return pipeline connected to the oil tank. The hydraulic oil in the rod cavity of the hydraulic cylinder 1 flows out under the action of external force or the oil pressure of the rodless cavity, passes through the stop valve 2. At this time, due to the reverse blocking effect of the oil inlet check valve 3, the hydraulic oil cannot pass through the oil inlet pipeline, but can only flow to the oil return pipeline, first passing through the hydraulic oil filter 5. If the hydraulic oil in the rod cavity is contaminated by impurities, the metal slag and other impurities brought out of the rod cavity will be effectively intercepted by the hydraulic oil filter 5 in this process. The relatively clean hydraulic oil after filtration passes through the oil return check valve 6 and finally flows back to the hydraulic valve table 7.

[0019] Through the above design, it is ensured that the oil must pass through the filter 5 when the oil is returned from the rod cavity of the hydraulic cylinder 1, thereby protecting the internal elements of the hydraulic valve table 7.

[0020] In the embodiment, a pressure monitoring structure 4 is preferably installed in parallel between the oil inlet end and the oil outlet end of the hydraulic oil filter 5. The pressure monitoring structure 4 can be a differential pressure switch, a differential pressure sensor with a signal output, or composed of two pressure gauges / pressure sensors for monitoring the pressure difference before and after the hydraulic oil filter 5. Under normal circumstances, the flow pressure difference of the hydraulic oil filter 5 is small. When the hydraulic oil filter 5 is gradually blocked due to too much impurities intercepted, the pressure difference between the two ends will significantly increase. When the pressure difference exceeds the preset threshold, the pressure monitoring structure 4 outputs an alarm signal such as a switch signal or an analog signal to the PLC or an alarm lamp, prompting the operator or maintenance personnel to check or replace the filter element of the hydraulic oil filter 5. The alarm signal can also alert that the dustproof structure of the hydraulic cylinder 1 may have failed and needs to be checked and repaired.

[0021] The stop valve 2 is usually a manual ball valve, which is simple in structure, low in cost and reliable in sealing. When the filter element of the hydraulic oil filter 5 needs to be replaced or other maintenance is needed, the stop valve 2 can be manually closed to temporarily isolate the rod cavity oil circuit of the hydraulic cylinder 1 from the outside, facilitating operation. According to the needs, an electromagnetic control stop valve can also be selected to realize remote control or automatic interlocking.

[0022] The oil inlet check valve 3 and the oil return check valve 6 can be ordinary spring return mechanical check valves, or can be selected according to the system pressure and control requirements. In the application scenario, the ordinary mechanical check valve can usually meet the requirements.

[0023] The device is simple and reliable in structure, economical in cost, convenient to maintain, and can effectively solve the problem of pollutants entering the hydraulic valve table 7 when the dustproof structure of the hydraulic cylinder 1 of the deep well casting machine fails, improve the reliability and service life of the hydraulic system, and is particularly suitable for the metallurgical casting industry with harsh working conditions.

[0024] The above only describes the preferred embodiments of the utility model, and does not limit the utility model. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. An oil circuit filtration protection device for a deep well casting machine hydraulic cylinder in case of dust failure, comprising a hydraulic cylinder (1) and a hydraulic valve platform (7), characterized in that: A parallel oil inlet pipe and a return pipe are provided between the rod chamber oil port of the hydraulic cylinder (1) and the working oil port of the hydraulic valve platform (7); an oil inlet check valve (3) is provided on the oil inlet pipe to control the hydraulic oil to flow unidirectionally from the hydraulic valve platform (7) to the rod chamber of the hydraulic cylinder (1); a hydraulic oil filter (5) and a return check valve (6) are connected in series on the return pipe. The hydraulic oil filter (5) is used to intercept impurities in the hydraulic oil, and the return check valve (6) is used to control the hydraulic oil to flow unidirectionally from the rod chamber of the hydraulic cylinder (1) to the hydraulic valve platform; a shut-off valve (2) is provided between the rod chamber oil port of the hydraulic cylinder (1) and the branch nodes of the oil inlet pipe and the return pipe to control the opening and closing of the oil circuit of the rod chamber of the hydraulic cylinder (1).

2. The apparatus according to claim 1, characterized in that: The inlet and outlet ends of the hydraulic oil filter (5) are connected to a pressure detection device (4) to monitor the pressure difference between the two ends of the hydraulic oil filter (5).

3. The apparatus according to claim 2, characterized in that: The pressure detection device (4) is a pressure switch or pressure sensor with signal output. When the pressure difference across the hydraulic oil filter (5) exceeds the set threshold, an alarm signal is triggered.

4. The apparatus according to claim 1, characterized in that: Both the inlet check valve (3) and the return check valve (6) are hydraulic check valves or mechanical check valves.

5. The apparatus according to claim 1, characterized in that: The shut-off valve (2) is a manual ball valve or a solenoid control valve.

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