An electric servo hydraulic cylinder

Abstract

The present invention discloses an electric servo hydraulic cylinder, which relates to the technical field of protection of electric servo hydraulic cylinders, including a servo motor and a hydraulic cylinder; the present invention can block dirt on a hydraulic extension rod by setting an anti-fouling retaining ring; by detecting the inlet and outlet flow rates of a filter hole, it is determined whether the filter hole is blocked according to the flow difference; once it is determined to be blocked, an execution module will start a dredging operation, and use air pressure to push out the blockage, so that the oil storage chamber can continuously obtain sufficient oil replenishment, thereby providing a stable oil source for the uniform coating of the oil film on the outer side of the hydraulic extension rod; by an energized spring popping out, an annular baffle is pressed down to block the oil in the oil storage chamber from contacting the film-coated penetration block, effectively preventing unnecessary oil seepage, ensuring the stability of the oil storage amount in the oil storage chamber, and further ensuring the uniformity and continuity of the oil film coating on the outer side of the hydraulic extension rod, which helps to extend the service life of the hydraulic extension rod and improve the working performance of the entire electric servo hydraulic cylinder.

Description

Technical Field

[0001] The invention relates to the technical field of protection of electric servo hydraulic cylinders, and in particular to an electric servo hydraulic cylinder. Background Art

[0002] The hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or swinging motion). It has a simple structure and reliable operation. When it is used to achieve reciprocating motion, the deceleration device can be eliminated, and there is no transmission gap, and the motion is smooth, so it is widely used in the hydraulic systems of various machines. The output force of the hydraulic cylinder is proportional to the effective area of ​​the piston and the pressure difference on both sides; the hydraulic cylinder is basically composed of a cylinder barrel and a cylinder head, a piston and a piston rod, a sealing device, a buffer device and an exhaust device. The buffer device and the exhaust device depend on the specific application, and other devices are indispensable.

[0003] Generally, servo hydraulic cylinders use anti-fouling retaining rings and sealing retaining rings to prevent oil leakage and dust on the extension rod. Although the simple retaining ring structure can block dust, the blocked dust will accumulate at the outlet of the extension rod, which will corrode repeatedly during the extension and retraction of the extension rod, making the outer surface of the extension rod susceptible to corrosion. Although the sealing retaining ring can effectively block the stable working pressure oil, the extension and retraction of the extension rod and the vibration of the device will cause the extension rod to continuously bring out the pressure oil, reducing the working life of the device.

[0004] In the prior art, the filter holes inside the first abutment box and the second abutment box are prone to clogging when filtering the oil, so that the oil storage chamber cannot be adequately replenished with oil, and when the oil film coating on the outer side of the hydraulic extension rod is performed, the oil film coating on the outer side of the hydraulic extension rod is uneven, affecting the normal use of the hydraulic extension rod; there is no blocking structure at the position of the film penetration block, so that the oil inside the oil storage chamber is easy to seep out from the position of the film penetration block, making the oil storage volume inside the oil storage chamber even more insufficient;

[0005] Therefore, the present application designs an electric servo hydraulic cylinder to solve the above problems. Summary of the invention

[0006] The purpose of the present invention is to solve the shortcomings in the prior art and to propose an electric servo hydraulic cylinder.

[0007] In order to achieve the above-mentioned object, the present invention adopts the following technical scheme: an electric servo hydraulic cylinder, comprising a servo motor and a hydraulic cylinder, wherein the servo motor and the hydraulic cylinder are connected via a servo controller, a hydraulic extension rod is slidably provided in the hydraulic cylinder, a connecting seat is provided on the bottom surface of the servo controller, a film-coating cleaning mechanism is provided on the top of the hydraulic cylinder, and the film-coating cleaning mechanism is sleeved on the middle part of the hydraulic extension rod;

[0008] A controller is installed outside the electric servo hydraulic cylinder, and a control component is also arranged inside the controller of the electric servo hydraulic cylinder. The control component includes a collection module, an analysis module and an execution module;

[0009] The acquisition module detects the oil film thickness data on the outside of the hydraulic extension rod, detects the mass and volume data of the mixture inside the sump, and transmits the detected data to the analysis module;

[0010] The analysis module analyzes the oil film thickness data to determine whether the surface of the hydraulic extension rod is dry. If it is determined to be dry, a coating signal is generated and the coating signal is transmitted to the execution module; the mass and volume data of the mixture are analyzed to determine whether the filter hole is blocked. If it is determined to be blocked, a dredging signal is generated and the dredging signal is transmitted to the execution module;

[0011] The execution module receives the signal transmitted by the analysis module and executes the corresponding operation according to the signal type.

[0012] Preferably, a mounting connection block for closing the hydraulic cylinder is provided at the top end of the hydraulic cylinder, an anti-fouling retaining ring is clamped and installed in the mounting connection block, and the inner wall of the anti-fouling retaining ring abuts against the hydraulic extension rod.

[0013] Preferably, a sealing ring is clamped and installed inside the upper wall of the hydraulic cylinder, and the inner wall of the sealing ring abuts against the hydraulic extension rod.

[0014] Preferably, the film-coating cleaning mechanism is composed of a first abutting box and a second abutting box, the lower ends of the first abutting box and the second abutting box are provided with matching thread grooves, and the film-coating cleaning mechanism is threadedly connected to the mounting connection block through the matching thread grooves.

[0015] Preferably, the first abutment box and the second abutment box are each provided with an oil storage chamber, and the side ends of the oil storage chamber are each provided with a membrane-coated permeable block, the membrane-coated permeable block is annular and fits on the outer wall of the hydraulic extension rod.

[0016] Preferably, an annular inclined dirt collecting groove is provided inside the first abutting box and the second abutting box, and filter holes connected to the oil storage chamber are equidistantly provided at the bottom ends of the dirt collecting grooves.

[0017] Preferably, hollow grooves are provided above the corresponding dirt collecting tanks inside the first abutment box and the second abutment box, and rubber bags are installed inside the hollow grooves. Air guide pipe 1 and air guide pipe 2 are respectively installed at both ends of the rubber bags, and rubber wheels are installed at the positions of the hydraulic extension rods corresponding to the upper surfaces of the first abutment box and the second abutment box through telescopic push rods, and the rotating shafts of the rubber wheels are connected to the reciprocating screw, and a support frame is installed on the outside of the reciprocating screw, and a reciprocating plate is slidably connected to the inside of the support frame corresponding to the outside of the reciprocating screw, and a telescopic hose is installed between the reciprocating plate and the support frame, and one-way valves are provided at the air outlet and air inlet of the telescopic hose, and the conduit connected to the air outlet is connected to air guide pipe 1, and air guide pipe 2 extends downward to the inside of the oil storage chamber; a telescopic groove is provided on the upper surface of the oil storage chamber at the position of the coated permeation block, and an annular baffle is connected to the inside of the telescopic groove through an energized spring.

[0018] Preferably, the steps of data analysis by the analysis module are as follows:

[0019] Step 1: The time difference between the ultrasonic sensor receiving the two reflected waves is , the propagation speed of ultrasonic wave in oil film is , then the oil film thickness outside the hydraulic extension rod at the detection position , the oil film thickness data detected at each position outside the hydraulic extension rod Perform statistics, if any , then for less than The number of detection positions m is recorded. If , a coating signal is generated and transmitted to the execution module. For the preset ratio, To preset the minimum oil film thickness;

[0020] Step 2: The density data of the mixture is , assuming that the volume fraction of oil in the mixture is , the density data of the oil is , the density data of dirt is ,but , calculate the volume fraction of oil If the volume fraction of the oil is greater than the preset volume fraction threshold, it is determined that filtrate will occur at the filter hole position, the flow data in and out of the filter hole position is detected, and the difference between the inlet and outlet flow rates is calculated. , if the preset flow difference threshold , it is determined that the filter hole is blocked, a clearing signal is generated, and the clearing signal is transmitted to the execution module.

[0021] Preferably, the steps of executing the operation by the execution module are as follows:

[0022] Step 1: After receiving the coating signal, the power-on spring connected to the annular baffle is energized to make the annular baffle shrink to the inside of the telescopic groove, and the oil in the oil storage chamber contacts the film-coated penetration block, and the surface of the hydraulic extension rod is coated with oil. When the amount of oil on the surface of the hydraulic extension rod reaches the set value, the power is cut off, so that the annular baffle, under the action of the rebounding power-on spring, blocks the oil in the oil storage chamber from contacting the film-coated penetration block again;

[0023] Step 2: After receiving the dredging signal, the telescopic push rod extends to make the rubber wheel contact with the surface of the hydraulic stretch rod. When the hydraulic stretch rod is displaced, the rubber wheel is driven to rotate, so that the reciprocating screw coaxial with the rubber wheel rotates. The reciprocating plate is restricted. When the reciprocating screw rotates, it slides up and down in the direction of the reciprocating screw, so that the telescopic hose absorbs external air under the restriction of the one-way valve and then transports it to the inside of the rubber bag through the air guide pipe. One-way valves are also set at both ends of the rubber bag, and a control switch is also set at the air outlet position of the rubber bag. The rubber bag swells under the filling of external air. When the air pressure reaches the set air pressure, a reset signal is transmitted to the telescopic push rod, so that the telescopic push rod retracts and resets. After that, the control switch at the air outlet position of the rubber bag is opened, so that the gas inside the rubber bag is transported to the inside of the oil storage chamber. The oil storage chamber is blocked by the annular baffle at the position of the membrane penetration block corresponding to the membrane penetration block, so that the expanded air pressure in the membrane penetration block has a force to push the blockage at the filter hole position outward, thereby achieving the effect of dredging the filter hole.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. Through the cooperation of the dirt collecting tank and the filter hole, it is convenient to recover and filter the oil and dirt on the hydraulic extension rod, which improves the cleaning efficiency of the hydraulic extension rod, and thus can realize the function of isolating and collecting dirt. Then, through the abutment cooperation between the membrane penetration block and the hydraulic extension rod, it is convenient to apply oil to the hydraulic extension rod. While protecting the hydraulic extension rod, the oil concentration on the other side of the hydraulic cylinder is increased, and thus the function of reducing the penetration of pressure oil can be realized, and finally the problem of dust blocking accumulation and pressure oil leakage is solved;

[0026] 2. The density data of the mixture inside the sump is regularly detected by the acquisition module in the control component, and the volume fraction of the oil is calculated. When the volume fraction of the oil is greater than the preset threshold, the inlet and outlet flow of the filter hole is detected, and whether the filter hole is blocked is determined based on the flow difference; once it is determined to be blocked, the execution module will start the dredging operation and use air pressure to push the blockage out, ensuring the unobstructed filter hole, so that the oil storage chamber can continue to be adequately replenished with oil, thereby providing a stable oil source for the uniform coating of the oil film on the outside of the hydraulic extension rod;

[0027] 3. The annular baffle is pressed down by the energized spring to block the contact between the oil in the oil storage chamber and the film penetration block, effectively preventing unnecessary oil leakage and ensuring the stability of the oil storage volume in the oil storage chamber. It provides sufficient oil reserve for the oil film coating operation, further ensuring the uniformity and continuity of the oil film coating on the outside of the hydraulic extension rod, which helps to extend the service life of the hydraulic extension rod and improve the working performance of the entire electric servo hydraulic cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0029] Figure 1 It is a schematic diagram of the overall three-dimensional structure proposed by the present invention;

[0030] Figure 2 It is a schematic diagram of the overall partial cross-sectional three-dimensional structure proposed by the present invention;

[0031] Figure 3 This is a schematic diagram of the three-dimensional structure of the film-coating cleaning mechanism proposed by the present invention;

[0032] Figure 4 This is a schematic diagram of the three-dimensional structure of the abutment box proposed by the present invention;

[0033] Figure 5 This is a schematic diagram of a cross-sectional three-dimensional structure of the abutment box proposed by the present invention;

[0034] Figure 6 It is a system flow chart of the present invention.

[0035] Serial numbers in the figure: 1. servo motor; 2. hydraulic cylinder; 3. hydraulic extension rod; 4. connecting seat; 5. installation connection block; 6. anti-fouling retaining ring; 7. coating cleaning mechanism; 8. sealing retaining ring; 9. first abutment box; 10. second abutment box; 11. matching thread groove; 12. dirt collecting tank; 13. coating penetration block; 14. filter hole; 15. oil storage chamber. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0037] Example: See Figure 1-6An electric servo hydraulic cylinder in the present invention comprises a servo motor 1 and a hydraulic cylinder 2, the servo motor 1 and the hydraulic cylinder 2 are connected through a servo controller, a hydraulic extension rod 3 is slidably provided in the hydraulic cylinder 2, a connecting seat 4 is provided on the bottom surface of the servo controller, a coating cleaning mechanism 7 is provided at the top of the hydraulic cylinder 2, and the coating cleaning mechanism 7 is sleeved on the middle part of the hydraulic extension rod 3. By setting the connecting seat 4 and the hinge ring at the top of the hydraulic extension rod 3, the servo hydraulic cylinder can be better hingedly installed, so that the servo hydraulic cylinder can rotate during the extension process; a mounting connection block 5 for closing the hydraulic cylinder 2 is provided at the top of the hydraulic cylinder 2, and an anti-fouling retaining ring 6 is clamped and installed in the mounting connection block 5, and the inner wall of the anti-fouling retaining ring 6 abuts against the hydraulic extension rod 3. The setting of the anti-fouling retaining ring 6 can block the dirt on the hydraulic extension rod 3.

[0038] In the present invention, a sealing ring 8 is clamped and installed in the upper wall of the hydraulic cylinder 2, and the inner wall of the sealing ring 8 abuts against the hydraulic extension rod 3. The setting of the sealing ring 8 can prevent the leakage of oil and improve the service life of the device; the coating cleaning mechanism 7 is composed of a first abutting box 9 and a second abutting box 10. The lower ends of the first abutting box 9 and the second abutting box 10 are provided with matching thread grooves 11. The coating cleaning mechanism 7 is threadedly connected to the installation connection block 5 through the matching thread grooves 11. Through the setting of the matching thread grooves 11, the first abutting box 9 and the second abutting box 10 can be pressed and assembled together while installing the coating cleaning mechanism 7; the first abutting box 9 and the second abutting box 10 are both provided with oil storage chambers 15, and the side ends of the oil storage chambers 15 are both provided with coatings The membrane permeation block 13 and the coated permeation block 13 are annular and fit on the outer wall of the hydraulic extension rod 3. Through the arrangement of the coated permeation block 13 and the oil storage chamber 15, the lubricating oil can be better transmitted to the inner wall of the coated permeation block 13, so that when the hydraulic extension rod 3 is extended, the hydraulic extension rod 3 is protected by a coating; the first abutment box 9 and the second abutment box 10 are both provided with an annular inclined dirt collecting trough 12 inside, and the bottom end of the dirt collecting trough 12 is equidistantly provided with filter holes 14 connected to the oil storage chamber 15. Through the arrangement of the dirt collecting trough 12, the hydraulic extension rod 3 can be swept through the end wall of the dirt collecting trough 12, so that the swept lubricating protective oil and dirt are collected into the dirt collecting trough 12 for filtration and separation, so as to achieve the effect of oil recovery and cleaning of the hydraulic extension rod 3.

[0039] A hollow groove is provided above the corresponding dirt collecting tank 12 inside the first abutting box 9 and the second abutting box 10, and a rubber bag is installed inside the hollow groove. An air guide pipe 1 and an air guide pipe 2 are installed at both ends of the rubber bag respectively. A rubber wheel is installed on the upper surface of the first abutting box 9 and the second abutting box 10 at the position corresponding to the hydraulic extension rod 3 through a telescopic push rod. The rotating shaft of the rubber wheel is connected to the reciprocating screw. A support frame is installed on the outside of the reciprocating screw. A reciprocating plate is slidably connected to the inside of the support frame corresponding to the outside of the reciprocating screw. A telescopic hose is installed between the reciprocating plate and the support frame. Check valves are provided at the air outlet and air inlet of the telescopic hose, and the conduit connected to the air outlet is connected to the air guide pipe 1, and the air guide pipe 2 extends downward to the inside of the oil storage chamber 15; a telescopic groove is provided on the upper surface of the oil storage chamber 15 at the position corresponding to the membrane penetration block 13, and an annular baffle is connected inside the telescopic groove through an energized spring;

[0040] A controller is installed outside the electric servo hydraulic cylinder, and a control component is also arranged inside the controller of the electric servo hydraulic cylinder. The control component includes a collection module, an analysis module and an execution module;

[0041] n ultrasonic sensors are installed on the upper surfaces of the first abutment box 9 and the second abutment box 10 at positions corresponding to the hydraulic extension rod 3 to record the propagation time of the ultrasonic wave. During the propagation of the ultrasonic wave, it first contacts the oil film on the outside of the hydraulic extension rod 3 and then contacts the hydraulic extension rod 3, so that the ultrasonic sensor can detect two reflected waves; the time difference between the two reflected waves is is the time it takes to propagate in the oil film, and the propagation speed of the ultrasonic wave in the oil film is , then the oil film thickness outside the hydraulic extension rod 3 at the detection position , the oil film thickness data detected at each position outside the hydraulic extension rod 3 Perform statistics, if any , then for less than The number of detection positions m is recorded. If , a coating signal is generated and transmitted to the execution module. For the preset ratio, To preset the minimum oil film thickness;

[0042] Regularly test the mass data and volume data of the mixture inside the sewage collection tank 12, calculate the density data of the mixture, retrieve the density data calculated in each period of the historical data, calculate the mean value e and standard deviation f of the density data, and set the fluctuation range of the density data to , filter out the density data that are not within the fluctuation range, calculate the mean of the remaining density data, and record the calculated mean as the density data of the mixture ;

[0043] Assume that the volume fraction of oil in the mixture is , the density data of the oil is , the density data of dirt is ,but , calculate the volume fraction of oil If the volume fraction of the oil is greater than the preset volume fraction threshold, it is determined that filtrate will occur at the filter hole 14, the flow data in and out of the filter hole 14 is detected, and the difference between the inlet and outlet flow rates is calculated. , if the preset flow difference threshold , it is determined that the filter hole 14 is blocked, a clearing signal is generated, and the clearing signal is transmitted to the execution module.

[0044] Working principle: When the present invention is used, the device is first fixedly installed through the connecting seat 4 and the hinge ring at the top of the hydraulic extension rod 3, then the motor is connected to the device, and then the device is started to run. The coating cleaning mechanism 7 is formed by the abutment of the annular box body of the first abutment box 9 and the second abutment box 10, and can be installed or removed by rotation, avoiding the tedious disassembly of the hydraulic cylinder 2. The setting of the coating penetration block 13 and the oil storage chamber 15 can better transmit the lubricating oil to the inner wall of the coating penetration block 13, so that when the hydraulic extension rod 3 is extended, the hydraulic extension rod 3 is protected and coated. The setting of the dirt collecting tank 12 can sweep the hydraulic extension rod 3 through the end wall of the dirt collecting tank 12, so that the swept lubricating protection oil and dirt are collected into the dirt collecting tank 12 for filtration and separation, so as to achieve the function of oil recovery and cleaning of the hydraulic extension rod 3. At this point, the use of the device is completed;

[0045] The energized spring on the inner side of the telescopic groove is in a pop-up state when idle, so that the annular baffle is pressed down to prevent the oil in the oil storage chamber 15 from contacting the membrane penetration block 13. When the filter hole 14 is blocked, the control component transmits a clearing signal to the telescopic push rod, and the telescopic push rod is extended to make the rubber wheel contact the surface of the hydraulic stretch rod 3. When the hydraulic stretch rod 3 is displaced, the rubber wheel is driven to rotate, so that the reciprocating screw coaxial with the rubber wheel rotates, and the reciprocating plate is restricted. When the reciprocating screw rotates, it slides up and down in the direction of the reciprocating screw, so that the telescopic hose absorbs the outside air under the restriction of the one-way valve and then flows into the rubber bag through the air guide pipe. The rubber bag is transported from the outside, and one-way valves are also arranged at both ends of the rubber bag, and a control switch is also arranged at the outlet position of the rubber bag. The rubber bag swells up when filled with external air. When the air pressure reaches the set air pressure, a reset signal is transmitted to the telescopic push rod, so that the telescopic push rod retracts and resets. After that, the control switch at the outlet position of the rubber bag is turned on, so that the gas inside the rubber bag is transported to the inside of the oil storage chamber 15. The oil storage chamber 15 is blocked by the annular baffle at the position corresponding to the membrane penetration block 13, so that the expanded air pressure in the membrane penetration block 13 has a force to push the blockage at the position of the filter hole 14 outward, so as to achieve the effect of clearing the filter hole 14;

[0046] When it is determined that the outer side of the hydraulic extension rod 3 needs to be coated with an oil film, a coating signal is generated, and the control component controls the energized spring connected to the annular baffle to be energized, so that the annular baffle is retracted to the inside of the telescopic groove, and the oil inside the oil storage chamber 15 contacts the coated penetration block 13, and the surface of the hydraulic extension rod 3 is coated with oil. When the amount of oil on the surface of the hydraulic extension rod 3 reaches a set value, the power is cut off, so that the annular baffle, under the action of the rebounding energized spring, again blocks the oil inside the oil storage chamber 15 from contacting the coated penetration block 13.

[0047] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An electric servo hydraulic cylinder, comprising a servo motor (1) and a hydraulic cylinder (2), characterized in that: The servo motor (1) and the hydraulic cylinder (2) are connected via a servo controller; a hydraulic extension rod (3) is slidably provided in the hydraulic cylinder (2); a connecting seat (4) is provided on the bottom surface of the servo controller; a coating cleaning mechanism (7) is provided at the top end of the hydraulic cylinder (2); and the coating cleaning mechanism (7) is sleeved on the middle part of the hydraulic extension rod (3); A controller is installed outside the electric servo hydraulic cylinder, and a control component is also arranged inside the controller of the electric servo hydraulic cylinder. The control component includes a collection module, an analysis module and an execution module; A collection module detects the oil film thickness data on the outside of the hydraulic extension rod (3), detects the mass and volume data of the mixture inside the sump (12), and transmits the detected data to the analysis module; The analysis module analyzes the oil film thickness data to determine whether the surface of the hydraulic extension rod (3) is dry. If it is determined to be dry, a coating signal is generated and the coating signal is transmitted to the execution module; the mass and volume data of the mixture are analyzed to determine whether the filter hole (14) is blocked. If it is determined to be blocked, a dredging signal is generated and the dredging signal is transmitted to the execution module; The execution module receives the signal transmitted by the analysis module and executes the corresponding operation according to the signal type.

2. The electric servo hydraulic cylinder according to claim 1, characterized in that: The top end of the hydraulic cylinder (2) is provided with a mounting connection block (5) for closing the hydraulic cylinder (2), an anti-fouling retaining ring (6) is clamped and mounted in the mounting connection block (5), and the inner wall of the anti-fouling retaining ring (6) abuts against the hydraulic extension rod (3).

3. The electric servo hydraulic cylinder according to claim 2, characterized in that: A sealing retaining ring (8) is clamped and installed inside the upper wall of the hydraulic cylinder (2), and the inner wall of the sealing retaining ring (8) abuts against the hydraulic extension rod (3).

4. The electric servo hydraulic cylinder according to claim 3, characterized in that: The coating cleaning mechanism (7) is composed of a first abutment box (9) and a second abutment box (10); matching thread grooves (11) are provided at the lower ends of the first abutment box (9) and the second abutment box (10); and the coating cleaning mechanism (7) is threadedly connected to the mounting connection block (5) via the matching thread grooves (11).

5. The electric servo hydraulic cylinder according to claim 4, characterized in that: The first abutment box (9) and the second abutment box (10) are each provided with an oil storage chamber (15), and a membrane-covered permeable block (13) is installed at the side end of each of the oil storage chambers (15). The membrane-covered permeable block (13) is annular and fits onto the outer wall of the hydraulic extension rod (3).

6. The electric servo hydraulic cylinder according to claim 5, characterized in that: The first abutment box (9) and the second abutment box (10) are both provided with an annular inclined dirt collecting groove (12), and the bottom ends of the dirt collecting grooves (12) are provided with filter holes (14) connected to the oil storage chamber (15) at equal intervals.

7. The electric servo hydraulic cylinder according to claim 6, characterized in that: A hollow groove is provided above the corresponding dirt collecting tank (12) in the first abutting box (9) and the second abutting box (10), and a rubber bag is installed in the hollow groove. An air guide tube 1 and an air guide tube 2 are installed at both ends of the rubber bag. A rubber wheel is installed on the upper surface of the first abutting box (9) and the second abutting box (10) at a position corresponding to the hydraulic extension rod (3) through a telescopic push rod. The rotating shaft of the rubber wheel is connected to the reciprocating screw. A support frame is installed on the outer side of the reciprocating screw. A reciprocating plate is slidably connected to the inner side of the support frame corresponding to the outer side of the reciprocating screw. A telescopic hose is installed between the reciprocating plate and the support frame. Check valves are provided at the air outlet and air inlet of the telescopic hose. The conduit connected to the air outlet is connected to the air guide tube 1. The air guide tube 2 extends downward to the inside of the oil storage chamber (15). A telescopic groove is provided on the inner upper surface of the oil storage chamber (15) at a position corresponding to the film-coated permeation block (13). An annular baffle is connected to the inside of the telescopic groove through an energized spring.

8. The electric servo hydraulic cylinder according to claim 7, characterized in that: The steps for data analysis in the analysis module are as follows: Step 1: The time difference between the ultrasonic sensor receiving the two reflected waves is , the propagation speed of ultrasonic wave in oil film is , then the oil film thickness on the outside of the hydraulic extension rod (3) at the detection position is , the oil film thickness data detected at various positions outside the hydraulic extension rod (3) Perform statistics, if any , then for less than The number of detection positions m is recorded. If , a coating signal is generated and transmitted to the execution module. For the preset ratio, To preset the minimum oil film thickness; Step 2: The density data of the mixture is , assuming that the volume fraction of oil in the mixture is , the density data of the oil is , the density data of dirt is ,but , calculate the volume fraction of oil If the volume fraction of the oil is greater than a preset volume fraction threshold, it is determined that filtrate will occur at the filter hole (14), the flow data of the inlet and outlet at the filter hole (14) is detected, and the difference between the inlet and outlet flow rates is calculated. , if the preset flow difference threshold , it is determined that the filter hole (14) is blocked, a clearing signal is generated, and the clearing signal is transmitted to the execution module.

9. The electric servo hydraulic cylinder according to claim 8, characterized in that: The steps for executing the module to perform operations are as follows: Step 1: After receiving the coating signal, the power-on spring connected to the annular baffle is energized to cause the annular baffle to retract into the telescopic groove, so that the oil in the oil storage chamber (15) contacts the membrane penetration block (13), and the surface of the hydraulic extension rod (3) is coated with oil. When the amount of oil on the surface of the hydraulic extension rod (3) reaches a set value, the power is turned off, so that the annular baffle, under the action of the rebounding power-on spring, blocks the oil in the oil storage chamber (15) from contacting the membrane penetration block (13) again; Step 2: After receiving the dredging signal, the telescopic push rod is extended so that the rubber wheel contacts the surface of the hydraulic stretch rod (3). When the hydraulic stretch rod (3) is displaced, the rubber wheel is driven to rotate, so that the reciprocating screw coaxial with the rubber wheel rotates. The reciprocating plate is restricted and slides up and down along the direction of the reciprocating screw when the reciprocating screw rotates, so that the telescopic hose absorbs external air under the restriction of the one-way valve and then transports it to the inside of the rubber bag through the air guide pipe. One-way valves are also provided at both ends of the rubber bag, and a control switch is also provided at the air outlet position of the rubber bag. The bag expands when filled with external air. When the air pressure reaches the set pressure, a reset signal is transmitted to the telescopic push rod, causing the telescopic push rod to retract and reset. The control switch at the air outlet position of the rear rubber bag is turned on, so that the gas inside the rubber bag is transported to the inside of the oil storage chamber (15). The oil storage chamber (15) is blocked by the annular baffle at the position corresponding to the membrane penetration block (13), so that the expanded air pressure in the membrane penetration block (13) has a force to push the blockage at the position of the filter hole (14) outward, thereby achieving the effect of clearing the filter hole (14).

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