Sacrificial anode anti-corrosion hydraulic cylinder

Abstract

The sacrificial anode anti-corrosion hydraulic cylinder comprises a cylinder body and a piston assembly, the piston assembly comprises a piston rod and a piston head arranged at the end, extending into the cylinder body, of the piston rod, the piston head is in sliding sealing fit with the inner wall of the cylinder body, and a cylinder body annular groove and an inner nest are formed in the inner side of the end, provided with a rodless cavity, of the cylinder body. A sacrificial anode ring is arranged in an annular groove of the cylinder body, the bottom of the inner nest is communicated with the outside through an outer connecting hole, a water quality sensor is arranged in the inner nest, and a sensor seal is arranged between the water quality sensor and the bottom of the inner nest. A communication line which sequentially penetrates through the sensor seal and the outer connecting hole and penetrates out of the cylinder body is in communication connection with the outside; the sacrificial anode ring for corrosion prevention of the cylinder body, especially the welding seam, is arranged in the cylinder body of the hydraulic cylinder, and the water quality sensor for monitoring the water quality index in real time is arranged, so that the corrosion prevention failure is avoided, and the hydraulic cylinder has the advantages of corrosion resistance, durability and reliability.

Description

Technical Field

[0001] The utility model relates to the technical field of fully-mechanized coal mining equipment, and more specifically, to a sacrificial anode anti-corrosion hydraulic cylinder. Background Art

[0002] Currently, coal mining in fully-mechanized coal mining faces mainly uses fully-mechanized mining units equipped with hydraulic supports, shearers, and scraper conveyors for construction and production. A large number of hydraulic cylinders are used for actions on fully-mechanized mining equipment such as hydraulic supports and scraper conveyors. The transmission medium inside the hydraulic cylinder generally uses emulsion or concentrated liquid. In addition to the high cost, leakage will also cause environmental pollution, which does not meet the requirements of green and sustainable development.

[0003] To promote the green and environmental protection of coal mining, using water medium to replace emulsion as the transmission medium of the hydraulic cylinder has become a development trend. There are hydraulic cylinders in the industry that use pure water as the transmission medium. Since the entire system is not completely sealed, pure water is extremely easy to be polluted and deteriorated, thus having certain corrosiveness and being prone to causing corrosion and failure of the hydraulic cylinder. To ensure a longer service life and higher reliability of the hydraulic cylinder, certain anti-corrosion treatments are required for the parts in contact with the water medium. However, due to limitations in surface treatment, processing, assembly, welding technology, etc., it is very difficult to achieve 100% full-quality protection for the parts of the hydraulic cylinder in contact with the water medium, resulting in poor corrosion resistance of the weakly protected parts of the hydraulic cylinder and affecting the service life and reliability of the hydraulic cylinder. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide a sacrificial anode anti-corrosion hydraulic cylinder, which can solve the technical problems that the corrosion resistance of the weakly protected parts of the hydraulic cylinder is poor and the service life and reliability of the hydraulic cylinder are affected when pure water is used as the transmission medium of the hydraulic cylinder at present.

[0005] The utility model provides the following technical solutions:

[0006] A sacrificial anode anti-corrosion hydraulic cylinder includes a cylinder body and a piston assembly. The piston assembly includes a piston rod and a piston head arranged at one end of the piston rod extending into the cylinder body. The piston head is in sliding and sealing fit with the inner wall of the cylinder body. An annular groove and an inner cavity are formed inside the cylinder body at the end of the rodless cavity. A sacrificial anode ring is arranged in the annular groove of the cylinder body. The bottom of the inner cavity is communicated with the outside through an external connection hole. A water quality sensor is arranged in the inner cavity, and a sensor seal is arranged between the water quality sensor and the bottom of the inner cavity. The water quality sensor is used to detect the water quality in the water medium of the rodless cavity, and is in communication connection with the outside through a communication line that sequentially passes through the sensor seal and the external connection hole and penetrates out of the cylinder body.

[0007] Further, the annular groove of the cylinder body is arranged on the radial outer side of the end of the cylinder body.

[0008] Furthermore, an annular filter screen is arranged on the outer side of the cylinder block ring groove to prevent the sacrificial anode ring that has corroded and fallen off from entering the rodless cavity.

[0009] Furthermore, the sacrificial anode anti-corrosion hydraulic cylinder further includes a controller and a warning device. The controller receives the detection data of the water quality sensor and compares it with the standard water quality. When it detects that the cation index of the water medium in the rodless cavity is higher than the upper limit of the standard water quality index or the cation concentration remains unchanged for more than a set time, an alarm is issued through the warning device.

[0010] Furthermore, the cylinder block includes a cylinder barrel, a cylinder bottom, a guide sleeve, and two joint seats. The cylinder bottom is located at one end of the cylinder barrel where the rodless cavity is provided. The cylinder block ring groove and the inner socket are both arranged on the cylinder bottom. The guide sleeve is located at one end of the cylinder barrel where the rodless cavity is provided, and the piston rod passes through the middle. The guide sleeve is used to support the piston rod for guiding and sealing sliding. Upper and lower liquid through holes communicating with the rod chamber and the rodless cavity respectively are arranged at both ends of the cylinder barrel. The two joint seats are arranged on the outer side of the cylinder barrel and are respectively communicated with the upper and lower liquid through holes. The cylinder barrel is fixedly welded to the cylinder bottom and the two joint seats.

[0011] Beneficial effects: In the sacrificial anode anti-corrosion hydraulic cylinder of the present invention, a sacrificial anode ring is provided inside the cylinder block. When electrochemical corrosion occurs, it loses electrons as the anode material and is preferentially consumed, protecting the cylinder block material as the cathode from corrosion, thereby realizing the protection of the welds and other weakly protected parts on the cylinder block, improving the corrosion resistance of the weakly protected parts of the hydraulic cylinder, extending the service life of the hydraulic cylinder, and enhancing its service reliability and durability. To prevent the cylinder block from being continuously corroded at the weakly protected parts after the sacrificial anode ring is consumed, a water quality detector is also arranged inside the cylinder block. The water quality detector detects the water quality in real time and transmits the measurement data to the controller. If the detected cation concentration has not changed for a long set time, it indicates that the sacrificial anode ring has been consumed. The controller alarms through the warning device to remind the operator to replace the sacrificial anode ring in time to continuously ensure the anti-corrosion function of the weakly protected parts of the hydraulic cylinder. The sacrificial anode rings are distributed on the radial outer side of the cylinder bottom end, that is, close to the weld position of the cylinder block, and the annular shape acts on the weld corrosion resistance in all directions. In addition, an annular filter screen is arranged outside the sacrificial anode ring to prevent the corroded and fallen-off sacrificial anode ring from entering the rodless cavity and causing system blockage, ensuring the smooth operation of the system. Description of the Drawings

[0012] Figure 1 It is a schematic structural diagram of a specific embodiment 1 of a sacrificial anode anti-corrosion hydraulic cylinder of the present invention;

[0013] Reference numerals: 1 - cylinder barrel; 2 - cylinder bottom; 3 - guide sleeve; 4 - upper liquid passage hole; 5 - lower liquid passage hole; 6 - adapter seat; 7 - piston head; 8 - piston rod; 9 - cylinder block ring groove; 10 - sacrificial anode ring; 11 - inner cavity; 12 - water quality sensor; 13 - sensor seal; 14 - annular filter screen; 15 - communication line; 16 - rod seal; 17 - static seal; 18 - piston seal; 19 - external connection hole; 20 - sensor probe. Detailed implementation mode

[0014] The present utility model will be described in detail below with reference to the accompanying drawings.

[0015] Specific embodiment 1 of a sacrificial anode anti-corrosion hydraulic cylinder of the present utility model:

[0016] As Figure 1 shown, the sacrificial anode anti-corrosion hydraulic cylinder mainly consists of a cylinder block and a piston assembly. The piston assembly includes a piston rod 8 and a piston head 7 provided at one end of the piston rod 8 extending into the cylinder block. A piston seal 18 that is hermetically fitted with the inner wall of the cylinder block is provided on the outside of the piston head 7, and the piston head 7 is slidably and hermetically fitted with the inner wall of the cylinder block. On both sides of the piston head 7 inside the cylinder block, there are respectively a rodless cavity and a rod cavity.

[0017] The cylinder block includes a cylinder barrel 1, a cylinder bottom 2, a guide sleeve 3, and two adapter seats 6. The cylinder bottom 2 is provided at one end of the cylinder barrel 1 where the rodless cavity is located, and the guide sleeve 3 is provided at one end of the cylinder barrel 1 where the rod cavity is located, and the middle part allows the piston rod 8 to pass through. Among them, a static seal 17 that is hermetically fitted with the inside of the cylinder barrel 1 is provided on the outside of the guide sleeve 3, and a rod seal 16 that is movably sealed with the piston rod 8 is provided on the inside of the guide sleeve 3. The guide sleeve 3 is used to support the piston rod 8 for guiding and sealing sliding. Upper liquid passage holes 4 and lower liquid passage holes 5 that respectively communicate with the rod cavity and the rodless cavity are provided at both ends of the cylinder barrel 1. The two adapter seats 6 are provided on the outside of the cylinder barrel 1 and are respectively communicated with the upper liquid passage hole 4 and the lower liquid passage hole 5. The cylinder barrel 1 is fixedly welded to the cylinder bottom 2 and the two adapter seats 6 respectively.

[0018] A cylinder block ring groove 9 and an inner cavity 11 are formed inside the cylinder bottom 2. A sacrificial anode ring 10 is arranged in the cylinder block ring groove 9, and the cylinder block ring groove 9 is arranged on the radial outside of the cylinder bottom 2, so that the sacrificial anode ring 10 is close to the weld joint between the cylinder barrel 1 and the cylinder bottom 2, and acts on the weld corrosion resistance comprehensively. The inner cavity 11 is arranged at the central position of the cylinder bottom 2. The bottom of the inner cavity 11 communicates with the outside through an external connection hole 19. A water quality sensor 12 is arranged in the inner cavity 11. A sensor seal 13 for isolating the water quality sensor 12 from the outside is arranged between the water quality sensor 12 and the bottom of the inner cavity 11. The water quality sensor 12 detects the water quality in the rodless cavity water medium through the sensor probe 20 and communicates with the controller through the communication line 15. The controller is connected with a warning device. In this embodiment, the warning device is a warning light. The communication line 15 passes through the sensor seal 13 and the external connection hole 19 in sequence from the inside to the outside and is connected to the controller.

[0019] The sacrificial anode ring 10 can be made of, but not limited to, zinc-aluminum alloy. The sacrificial anode ring 10 is arranged inside the cylinder block. When electrochemical corrosion occurs, the sacrificial anode ring 10, as the anode material, loses electrons and is preferentially consumed and corroded, thereby protecting the cylinder block material as the cathode from corrosion, and thus improving the corrosion resistance of the welds and other weakly protected parts on the cylinder block. A circular filter screen 14 is also arranged outside the sacrificial anode ring to prevent the sacrificial anode ring 10 with corrosion products falling off from entering the rodless cavity and causing system blockage and affecting the normal operation of the system.

[0020] To prevent the cylinder block from being continuously corroded at the weakly protected parts after the sacrificial anode ring is consumed, a water quality sensor 12 for real-time detection of the water quality index in the rodless cavity is arranged inside the cylinder block. The water quality sensor 12 transmits the water quality data to the controller, and the controller compares the measured data with the standard water quality. When the cation concentration remains unchanged for more than the set time, it indicates that the sacrificial anode ring is consumed. The warning light flashes to give a warning, reminding the personnel to repair / replace the sacrificial anode ring; when it is detected that the cation index of the water medium in the rodless cavity is higher than the upper limit of the standard water quality index, it indicates that the water quality is poor and the anti-corrosion index is poor. The warning light flashes to give a warning, and the hydraulic cylinder is controlled to act through the driver, electromagnetic directional valve and joint seat to input fresh water medium and discharge the excessive water medium to prevent the excessive water from accelerating the internal corrosion of the cylinder block without being replaced in time.

[0021] In this sacrificial anode anti-corrosion hydraulic cylinder, during operation, the sacrificial anode ring inside the cylinder block is preferentially consumed and corroded as the anode material when electrochemical corrosion occurs, protecting the cylinder block material as the cathode from corrosion, and then realizing the function of protecting the welds and other weakly protected parts on the cylinder block from being easily corroded, improving the corrosion resistance of the welds and other parts and even the whole cylinder block, prolonging the service life of the hydraulic cylinder, and improving the overall reliability and durability of the hydraulic cylinder. In addition, a water quality detector is set to detect the water quality data in real time, and then the controller analyzes and monitors the data, compares the measured water quality index with the standard water quality index. When the detected cation concentration does not change within a long set time period, it indicates that the sacrificial anode ring has been consumed. The controller controls the warning light to flash and alarm, reminding the operator to replace the sacrificial anode ring in time to ensure continuous and uninterrupted anti-corrosion protection of the weakly protected parts of the cylinder block as much as possible; when it is detected that the cation index of the water medium in the rodless cavity is higher than the upper limit of the standard water quality index, it indicates that the water quality is poor and the anti-corrosion index is poor. The controller controls the warning light to flash and alarm, and controls the hydraulic cylinder to act through the driver, electromagnetic directional valve and joint seat to input fresh water medium and discharge the excessive water medium to avoid internal corrosion of the cylinder block caused by the excessive water not being replaced in time.

[0022] In summary, the present utility model not only specifically sets sacrificial anode rings at vulnerable protection positions such as weld seams to protect the cylinder body from being easily corroded, but also has the function of real-time monitoring of the water quality inside the cylinder body, and alarms in time when the sacrificial anode rings are completely consumed / the water medium exceeds the standard, prompting to replace the sacrificial anode rings or fresh water medium in time, effectively avoiding the failure of the corrosion protection effect, and having the advantages of good corrosion resistance, long service life and high reliability.

[0023] The above are only the preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited to the above embodiments. All technical solutions falling within the concept of the present utility model belong to the protection scope of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements should also be regarded as within the protection scope of the present utility model.

Claims

1. A sacrificial anode anti-corrosion hydraulic cylinder, comprising a cylinder body and a piston assembly, wherein the piston assembly comprises a piston rod and a piston head arranged at one end of the piston rod extending into the cylinder body, wherein the piston head is in sliding sealing cooperation with the inner wall of the cylinder body, wherein the characteristics are: A cylinder ring groove and an inner socket are provided on the inner side of one end of the rodless cavity. A sacrificial anode ring is arranged in the cylinder ring groove. The bottom of the inner socket is connected with the outside through an external connecting hole. A water quality sensor is arranged in the inner socket and a sensor seal is arranged between the water quality sensor and the bottom of the inner socket. The water quality sensor is used to detect the water quality in the water medium of the rodless cavity, and is connected to the outside through a communication line which passes through the sensor seal and the external connecting hole and out of the cylinder body in sequence.

2. A sacrificial anode anti-corrosion hydraulic cylinder as claimed in claim 1, characterized in that: The cylinder body annular groove is arranged on the radial outer side of the cylinder body end portion.

3. A sacrificial anode anti-corrosion hydraulic cylinder as claimed in claim 1, characterized in that: An annular filter is arranged on the outside of the cylinder ring groove to prevent the corroded and fallen sacrificial anode ring from entering the rodless cavity.

4. A sacrificial anode anti-corrosion hydraulic cylinder as claimed in claim 1, characterized in that: It also includes a controller and an alarm. The controller receives detection data from the water quality sensor and compares it with the standard water quality. When it is detected that the cation index of the rodless chamber water medium is higher than the upper limit of the standard water quality index or the cation concentration remains unchanged for more than a set time, an alarm is issued through the alarm.

5. A sacrificial anode anti-corrosion hydraulic cylinder as claimed in any one of claims 1 to 4, characterized in that: The cylinder body includes a cylinder barrel, a cylinder bottom, a guide sleeve, and two joint seats. The cylinder bottom is located at one end of the cylinder barrel where a rodless cavity is set. The cylinder body ring groove and inner nest are both set on the cylinder bottom. The guide sleeve is located at one end of the cylinder barrel where a rodless cavity is set, and the middle is for the piston rod to pass through. The guide sleeve is used to support the piston rod guide seal to slide. Upper and lower liquid holes that are connected to the rod cavity and the rodless cavity are respectively provided at both ends of the cylinder barrel. Two joint seats are arranged on the outside of the cylinder barrel and are respectively connected to the upper and lower liquid holes. The cylinder barrel is welded and fixed to the cylinder bottom and the two joint seats.

Images