CN104296930B - A kind of hydraulic reciprocating movable sealing status monitoring sensor - Google Patents

Abstract

The present invention is a kind of hydraulic reciprocating movable sealing status monitoring sensor, mainly it is made up of reciprocating dynamic seal groove bottom sensor (5) and reciprocating dynamic seal groove side sensor (6), wherein: reciprocating dynamic seal groove bottom sensor includes seal groove bottom surface sensing grating and lays matrix, it is laid on the seal groove bottom surface strain sensing grating of this matrix inner circumferential, and the seal groove bottom surface temperature sensing grating being laid on inside this matrix in axial groove, it is used for monitoring temperature and the strain variation of reciprocating dynamic seal (7) bottom surface；Reciprocating dynamic seal groove side sensor includes seal groove side sensing grating and lays matrix, is laid on the seal groove side strain sensing grating in this base end circumferential slot, is used for monitoring the strain variation of reciprocating dynamic seal (7) side.The present invention is suitable for the 26S Proteasome Structure and Function needs of different model hydraulic actuator, simultaneously facilitates processing, installs and change, it is possible to realize the real-time monitoring to the change of hydraulic reciprocating movable sealing state.

Description

A hydraulic reciprocating seal state monitoring sensor

technical field

The invention relates to a sensor, in particular to a hydraulic reciprocating dynamic sealing state monitoring sensor.

Background technique

The hydraulic reciprocating seal is a key basic component used in hydraulic actuators. Its function is to separate spaces with the same or different pressures to prevent the exchange of liquid or gas media. It is usually made of polymer or thermoplastic materials, as well as composite materials. Among all kinds of failures in the hydraulic system, the leakage of hydraulic medium due to seal failure is the most important form of failure and one of the most difficult problems to solve. It not only affects the operation efficiency and construction quality of mechanical equipment, but also affects the environment. pollution and hazards. In engineering practice, there are two main reasons for the failure of the reciprocating dynamic seal of the hydraulic system. Fatigue failure; Second, in the actual working environment of the hydraulic system, there are often a large number of substances that cause oil pollution. As the reciprocating motion of the actuator enters the system, it will further aggravate the failure process of the reciprocating dynamic seal. In addition, the structural design, installation, start-up and operation of the reciprocating dynamic seal are all possible reasons for its failure. Therefore, the reliability of the work of hydraulic system actuators mainly depends on the effectiveness of the reciprocating seal. The invention aims at improving the reliability of hydraulic system actuators, and uses optical fiber sensing technology to monitor the state of the reciprocating dynamic seal of the hydraulic system in time, and realizes the monitoring and effective prevention of leakage faults during the actual working process of the equipment.

Contents of the invention

The technical problem to be solved by the present invention is to provide a fiber grating-based hydraulic reciprocating seal state monitoring in view of the fact that the existing technology cannot realize real-time monitoring of the reciprocating dynamic seal state in the actuator during the working process of the hydraulic system. The design of the sensor.

The present invention solves its technical problem and adopts the following technical solutions:

The hydraulic reciprocating sealing state monitoring sensor provided by the present invention is mainly composed of a reciprocating sealing groove bottom surface sensor and a reciprocating sealing groove side sensor, wherein: the reciprocating sealing groove bottom surface sensor includes a sealing groove bottom surface sensing grating laying base, laid on The strain sensing grating on the bottom surface of the sealing groove in the inner circumferential direction of the substrate, and the temperature sensing grating on the bottom surface of the sealing groove laid in the axial groove inside the substrate are used to monitor the temperature and strain changes of the bottom surface of the reciprocating seal; the reciprocating seal groove The side sensor includes a substrate for laying the sensing grating on the side of the sealing groove, and a sensing grating for strain on the side of the sealing groove laid in the circumferential groove on the end surface of the substrate to monitor the strain change of the side of the reciprocating seal.

The sensing gratings are glued in the grooves of the corresponding laying substrates with epoxy resin.

The side sensor of the reciprocating movable sealing groove is an interference fit between the sensors on the bottom surface of the reciprocating movable sealing groove, so as to ensure that the sensing grating and the dynamic sealing working surface maintain close contact, and at the same time ensure the relative positional relationship between the two sensors, so as to facilitate The output of the optical fiber.

The axial positions of the side sensor of the reciprocating sealing groove and the bottom surface sensor of the reciprocating sealing groove are fixed by the end cover and the connecting screw.

The preparation method of the above-mentioned hydraulic reciprocating seal state monitoring sensor provided by the present invention comprises the following steps:

(1) Encapsulation of the temperature sensing grating on the bottom surface of the sealing groove:

Coat a layer of high-temperature-resistant epoxy resin on the surface of the bare grating. The thickness of the coating should be just enough to cover the grating. The adhesive seals the outlets at both ends of the capillary steel pipe;

(2) Laying of the strain sensing grating on the bottom of the sealing groove:

①Apply a layer of room temperature curing epoxy resin evenly in the circumferential groove on the inner surface of the sensor grating on the bottom surface of the sealing groove,

② Lay the strain sensing grating on the bottom surface of the sealing groove for monitoring the strain change of the reciprocating dynamic seal before it is cured.

③Lay epoxy resin to make the thickness consistent with the radial thickness of the strain sensing grating on the bottom of the sealing groove, and the leading end of the sensing fiber is led out together with the leading end of the optical fiber of the temperature sensing grating on the bottom surface laid in the axial groove;

(3) Laying of the temperature sensing grating on the bottom surface of the sealing groove:

① Evenly coat a layer of room temperature curing epoxy resin in the axial groove on the inner surface of the sensor grating on the bottom surface of the sealing groove.

② Lay the fiber grating for temperature monitoring before it is cured, and lay the fiber lead-out part of the strain sensor grating on the bottom of the sealing groove at the same time,

③Lay epoxy resin to make the thickness consistent with the radial thickness of the temperature sensing grating on the bottom surface of the reciprocating sealing groove, and then remove the temperature sensing grating on the bottom surface and the optical fiber leading end of the strain sensing grating on the bottom surface of the sealing groove together from the end cover in advance. Lead out from the opened fiber lead-out hole;

(4) Laying of the strain sensing grating on the side of the sealing groove:

① Use a soft brush dipped in room temperature curing epoxy resin to evenly coat a layer in the circumferential groove of the end surface of the base body where the sensing grating is laid on the side of the sealing groove,

② Lay the strain sensing grating on the side of the sealing groove before it is cured,

③Pay epoxy resin so that its thickness is consistent with the radial thickness of the strain sensing grating on the side of the sealing groove. elicit;

(5) Installation of the bottom sensor of the reciprocating seal groove and the side sensor of the reciprocating seal groove:

The sensor on the bottom surface of the reciprocating seal groove and the sensor on the side of the reciprocating seal groove manufactured according to the above steps are installed in the seal groove of the cylinder head before installing the reciprocating seal groove bottom surface sensor, and then the reciprocating seal groove is installed Install, then install the side sensor of the reciprocating seal groove on the inner circumferential surface of the sensor on the bottom surface of the reciprocating seal groove, and ensure that the side sensor of the reciprocating seal groove can be in close contact with the left end face of the reciprocating seal.

Compared with the prior art, the present invention has the following advantages:

1. The sensor designed by the present invention can measure the strain and temperature of the reciprocating seal through the strain fiber grating and temperature fiber grating laid on the bottom and side of the reciprocating sealing groove without changing the existing structure and function of the hydraulic system actuator. Real-time monitoring of state changes of hydraulic reciprocating seals.

2. The sensor structure designed by the present invention adopts the standard structural design idea, so that it can adapt to the structural and functional requirements of different types of hydraulic actuators, and is convenient for processing, installation and replacement.

Description of drawings

Fig. 1 is a structural schematic diagram of a hydraulic reciprocating seal state monitoring sensor of the present invention.

FIG. 2 is a schematic structural diagram of the substrate 601 for laying the sensing grating on the side of the sealing groove in the reciprocating side sensor 6 of the sealing groove in FIG. 1 .

Fig. 3 is a cross-sectional view along line A-A of Fig. 2 .

FIG. 4 is a schematic structural diagram of the substrate 502 for laying the sensing grating on the bottom surface of the sealing groove in the sensor 5 on the bottom surface of the reciprocating sealing groove in FIG. 1 .

Fig. 5 is a cross-sectional view along line A-A of Fig. 4 .

FIG. 6 is a schematic structural view of the end cap 3 in FIG. 1 .

Fig. 7 is a right side view of Fig. 6 .

Fig. 8 is a package schematic diagram of a temperature sensing grating 500 (composed of an optical fiber 5002, a bare grating 5003 and a capillary steel tube 5001) at the bottom of the sealed groove.

9, 10, and 11 are schematic diagrams of laying a strain sensing grating 501 on the bottom surface of the sealing groove in the sensor 5 on the bottom surface of the reciprocating movable sealing groove.

12, 13, and 14 are schematic diagrams of laying an axial temperature sensing fiber grating 500 in the reciprocating sealing groove bottom sensor 5 (501 marked in the figure refers to the strain sensing grating on the bottom surface of the sealing groove, and the optical fiber lead-out end needs to be read from the axial temperature lead out from the laying groove of the sensing fiber grating 500).

15, 16, and 17 are schematic diagrams of laying a strain sensing grating 600 on the side of the sealing groove in the reciprocating side sensor 6 of the sealing groove.

18 to 21 are schematic diagrams of the installation of the reciprocating seal groove bottom sensor 5 and the reciprocating seal groove side sensor 6 .

In the figure: 1. Piston rod; 2. Dustproof ring; 3. End cover; 4. Gasket; 5. Reciprocating seal groove bottom sensor; 6. Reciprocating seal groove side sensor; 7. Reciprocating seal; 8. Cylinder Head; 9. Cylinder; 10. Connecting screw; 500. Temperature sensing grating at the bottom of the sealing groove (5001. Capillary steel pipe; 5002. Optical fiber; 5003. Bare grating); 501. Strain sensing grating at the bottom of the sealing groove; 502. Sealing 600. The strain sensing grating on the side of the sealed groove; 601. The substrate for the sensing grating on the side of the sealed groove.

detailed description

The invention provides a hydraulic reciprocating seal state monitoring sensor that can be installed in the reciprocating seal groove of a hydraulic actuator. The sensor is equipped with a strain fiber grating and a temperature fiber grating inside, and can be installed in the reciprocating seal groove together with the hydraulic reciprocating seal. Synchronous installation and use within the hydraulic actuator can monitor the possible failure state of the hydraulic reciprocating dynamic seal during the working process of the hydraulic actuator, effectively preventing and avoiding leakage and safety accidents caused by seal failure.

The present invention will be further described below in conjunction with examples, but the content of the present invention is not limited only to the following examples.

Example 1. Hydraulic reciprocating seal state monitoring sensor

The hydraulic reciprocating dynamic seal state monitoring sensor is a sensor based on fiber grating, which can be used to monitor the working state of the reciprocating dynamic seal in the hydraulic cylinder to prevent the leakage of the working medium. It is characterized by a sensor grating laying base, a strain sensing fiber grating and a temperature sensing fiber grating. The structure and size of the sensing grating laying base are given according to the structure and size of the hydraulic system actuators, and can meet the requirements of the hydraulic system. Under the premise of the normal function of the actuator, the strain sensing fiber grating and temperature sensing fiber grating are laid in the specially opened circumferential groove and axial groove, and through reasonable structural design, it can be used in the hydraulic system. Easy to install and replace in the component. Its structure is shown in FIGS. 1 to 21 , which includes a reciprocating seal groove bottom sensor 5 and a reciprocating seal groove side sensor 6 . Among them: the reciprocating sealing groove bottom surface sensor 5 adopts 45# steel as the raw material, including the sealing groove bottom surface sensing grating laying substrate 502 and the sealing groove bottom surface strain sensing grating 501 laid on its inner circumferential direction, and the sealing groove bottom surface strain sensing grating 501 laid on its inner axial direction. The temperature sensing grating 500 on the bottom surface of the sealing groove is used to monitor the temperature and strain changes on the bottom surface of the reciprocating seal 7 . The reciprocating sealing groove side sensor 6 uses 45# steel as the raw material, including the sealing groove side sensing grating laying base 601 and the sealing groove side strain sensing grating 600 laid in the circumferential groove on its end surface, used to monitor the reciprocating sealing groove 7 Variations in strain on the sides. Wherein, the optical fiber grating is glued in the groove of the corresponding laying substrate with epoxy resin. The side sensor 6 of the reciprocating seal groove is used to monitor the side of the reciprocating seal 7, and it is an interference fit with the sensor 5 on the bottom surface of the reciprocating seal groove to ensure that the sensing grating and the working surface of the dynamic seal are kept in close contact, while ensuring the reciprocating The relative positional relationship in the circumferential direction between the bottom surface sensor 5 of the dynamic sealing groove and the side sensor 6 of the reciprocating dynamic sealing groove is to facilitate the extraction of the optical fiber. The axial position fixing of the reciprocating seal groove bottom surface sensor 5 and the reciprocating seal groove side sensor 6 is guaranteed by the end cover 3 and the connecting screw 10 .

The cylinder head 8 is connected to the cylinder barrel 9 through connecting screws 10 . The gasket 4 is used to compensate possible dimensional errors in the manufacture of the end cap 3 and the cylinder head 8 .

The cylinder 9 is used to provide a closed pressure oil chamber for the reciprocating movement of the piston rod 1 of the hydraulic cylinder in the hydraulic system. The piston rod 1 is a part that performs extension and retraction movements according to the working needs of the hydraulic system. The dustproof ring 2 is used to block the pollutants that may be brought into the system along with the piston rod 1 during the process of extending and retracting the piston rod 1 .

The sensing grating laying substrate 502 on the bottom surface of the sealing groove and the laying substrate 601 on the side sensing grating of the sealing groove are used for laying the strain sensing fiber grating and the temperature sensing fiber grating on the bottom surface and the side of the sealing groove, and laying the sensing grating on the bottom surface of the sealing groove The base body 502 is installed in the sealing groove reserved in the cylinder head, and the sensing grating laying base 601 on the side of the sealing groove cooperates with the sensing grating laying base 502 on the bottom surface of the sealing groove. Its structure and size are given according to the structure and size of the hydraulic system actuator. fixed, can be easily installed and replaced.

The strain sensing grating 501 on the bottom of the sealing groove and the strain sensing grating 600 on the side of the sealing groove are used to monitor the strain change of the reciprocating sealing working surface, wherein the strain sensing grating 501 on the bottom of the sealing groove is installed on the substrate for laying the sensing grating on the bottom of the sealing groove In the circumferential groove inside 502 , the strain sensing grating 600 on the side of the sealing groove is installed in the circumferential groove on the end surface of the substrate 601 where the sensing grating is laid on the side of the sealing groove.

The temperature sensing grating 500 on the bottom surface of the sealing groove is used to monitor the temperature change of the reciprocating sealing working surface, and it is installed in the axial groove inside the substrate 502 where the sensing grating on the bottom surface of the sealing groove is laid.

The above optical fiber grating-based hydraulic reciprocating dynamic sealing state monitoring sensor, through the strain sensing optical fiber grating and temperature sensing optical fiber grating laid on the bottom and side of the reciprocating dynamic sealing groove, realizes the reciprocating dynamic sealing during the working process of the hydraulic system actuator. Real-time monitoring of the state (see Table 1 to Table 7), so that it can be replaced in time before it fails, so as to prevent the occurrence of leakage failure and avoid environmental pollution and safety accidents.

The working process of the hydraulic reciprocating seal state monitoring sensor is: during the working process of the hydraulic cylinder, the temperature and strain on the surface of the reciprocating seal 7 are realized by the wavelength change of the reciprocating seal groove bottom surface sensor 5 and the reciprocating seal groove side sensor 6 The real-time monitoring of changes can judge whether the working state of the reciprocating dynamic seal 7 is normal, so as to replace the failed reciprocating dynamic seal in time, prevent leakage, and reduce and avoid unnecessary losses.

Example 2. Preparation of a fiber grating-based hydraulic reciprocating seal state monitoring sensor

The hydraulic reciprocating dynamic seal state monitoring sensor is designed as a standardized part according to the structure and function requirements of the actuator of the hydraulic system, which can realize unified processing and is convenient for assembly and replacement. Among them, the preparation of the temperature sensing fiber grating and the laying steps of the sensing grating on the bottom of the sealing groove are as follows:

(1) Encapsulation of the temperature sensing grating 500 on the bottom surface of the sealing groove:

The temperature sensing grating 500 on the bottom of the sealing groove is encapsulated by the following method: Referring to FIG. 8 , coat a layer of high-temperature-resistant epoxy resin on the surface of the bare grating 5003, and the thickness of the coating should be just enough to wrap the grating. Penetrate the capillary steel pipe 5001 before it solidifies, and ensure that the bare grating 5003 is in the middle of the capillary steel pipe 5001, and 5002 is the leading optical fiber, and then seal the outlets at both ends of the capillary steel pipe with a high-temperature resistant adhesive (J133 type epoxy resin).

(2) Laying of the strain sensor grating 501 on the bottom surface of the sealing groove:

As shown in Figures 9 to 11: ①Apply a layer of room temperature curing epoxy resin 503 evenly in the circumferential groove on the inner surface of the sensor grating laying substrate 502 on the bottom surface of the sealing groove, and ②Pay it before it is cured. The strain sensing grating 501 on the bottom surface of the sealing groove is used to monitor the strain. ③ Lay epoxy resin 503 to make the thickness consistent with the radial thickness of the strain sensing grating 501 on the bottom surface of the sealing groove. The fiber leading ends of the bottom surface temperature sensing grating 500 are led out together.

(3) Laying of the temperature sensing grating 500 on the bottom surface of the sealing groove:

As shown in Figures 12 to 14: ① uniformly coat a layer of room temperature curing epoxy resin 503 in the axial groove on the inner surface of the substrate 502 where the sensor grating is laid on the bottom surface of the sealing groove, and ② use it for laying before it is cured. For the fiber grating 500 used to monitor the temperature, at the same time lay the lead-out end of the optical fiber of the strain sensing grating 501 on the bottom surface of the sealing groove ③ and then lay epoxy resin 503 to make the thickness consistent with the radial thickness of the temperature sensing grating 500 on the bottom surface of the reciprocating sealing groove. Then the leading ends of the optical fibers of the bottom temperature sensing grating 500 and the sealing groove bottom strain sensing grating 501 are drawn together from the fiber leading hole (see d6 in Fig. 7 ) opened in advance in the end cover 3 .

(4) Laying of the strain sensor grating 600 on the side of the sealing groove:

As shown in Figures 15 to 17: ① Dip a soft brush into the room temperature curing epoxy resin 602 to evenly coat a layer in the circumferential groove of the end surface of the substrate 601 where the sensor grating is laid on the side of the sealing groove. The strain sensing grating 600 on the side of the groove, ③ lay epoxy resin 602 to make its thickness consistent with the radial thickness of the strain sensing grating 600 on the side of the sealing groove, and the lead-out end of the optical fiber is laid on the substrate 601 of the sensing grating on the side of the sealing groove. The axial hole (see hole d4 in FIG. 2 ) is led out from the fiber outlet hole (see d6 in FIG. 7 ) in the end cap 3 .

(5) Installation of sensor 5 on the bottom surface of the reciprocating seal groove and sensor 6 on the side of the reciprocating seal groove:

The bottom surface sensor 5 of the reciprocating sealing groove and the side sensor 6 of the reciprocating sealing groove made according to the preceding steps are installed in the sealing groove of the cylinder head 8 before the reciprocating sealing groove bottom surface sensor 5 is installed, and then To install the reciprocating seal 7, install the reciprocating seal groove side sensor 6 on the inner circumference of the reciprocating seal groove bottom sensor 5, and ensure that the reciprocating seal groove side sensor 6 can be in close contact with the left end surface of the reciprocating seal 7 . As an application example of the present invention, the installation of the reciprocating seal groove bottom surface sensor 5 and the reciprocating seal groove side sensor 6 in the hydraulic cylinder piston rod reciprocating seal groove is shown in Fig. 18 to Fig. 21 .

The structure of the assembled hydraulic reciprocating dynamic seal state monitoring sensor of the present invention is shown in FIG. 1 .

Table 1 The initial wavelength, corresponding channel and sensitivity coefficient of the sensing grating

Table 2 Test data of reciprocating dynamic seal under medium pressure 1MPa under normal state

Table 3 Test data of reciprocating dynamic seal under medium pressure 2MPa under normal state

Table 4 The data of the reciprocating dynamic seal under the normal state when the medium pressure is 3MPa

Table 5 Test data of reciprocating dynamic seal under medium pressure of 1MPa in worn state

Table 6 Test data of reciprocating dynamic seal under medium pressure of 2MPa in worn state

Table 7 The test data of the reciprocating dynamic seal under the wear state at the medium pressure of 3MPa

Claims (4)

1. A hydraulic reciprocating dynamic sealing state monitoring sensor is characterized in that it is mainly composed of a reciprocating dynamic sealing groove bottom surface sensor (5) and a reciprocating dynamic sealing groove side sensor (6), wherein: the reciprocating dynamic sealing groove bottom surface sensor (5) includes The sensing grating on the bottom of the sealing groove is laid on the substrate, the strain sensing grating on the bottom of the sealing groove is laid on the inner side of the substrate, and the temperature sensing grating on the bottom of the sealing groove is laid on the axial groove on the inner side of the substrate to monitor the reciprocating seal. (7) Temperature and strain changes of the bottom surface; reciprocating sealing groove side sensor (6) includes a sealing groove side sensor grating laying substrate, and a sealing groove side strain sensing grating laid in the circumferential groove of the substrate end surface is used to monitor The strain change of the side of the reciprocating dynamic seal (7); The hydraulic reciprocating dynamic sealing state monitoring sensor is made by the following method, and the steps include: 1) Encapsulation of the temperature sensing grating on the bottom surface of the sealing groove: Coat a layer of high-temperature-resistant epoxy resin on the surface of the bare grating. The thickness of the coating should be just enough to cover the grating. The adhesive seals the outlets at both ends of the capillary steel pipe; 2) Laying of the strain sensing grating on the bottom of the sealing groove: ①Apply a layer of room temperature curing epoxy resin evenly in the circumferential groove on the inner surface of the sensor grating on the bottom surface of the sealing groove, ② Lay the strain sensing grating on the bottom of the sealing groove for strain monitoring before it is cured, ③Lay epoxy resin to make the thickness consistent with the radial thickness of the strain sensing grating on the bottom of the sealing groove, and the leading end of the sensing fiber is led out together with the leading end of the optical fiber of the temperature sensing grating on the bottom surface laid in the axial groove; 3) Laying of the temperature sensing grating on the bottom surface of the sealing groove: ① Evenly coat a layer of room temperature curing epoxy resin in the axial groove on the inner surface of the sensor grating on the bottom surface of the sealing groove. ② Lay the optical fiber grating for temperature monitoring before it is cured, and lay the lead-out end of the optical fiber of the strain sensing grating on the bottom of the sealing groove at the same time, ③ Lay epoxy resin to make the thickness consistent with the radial thickness of the temperature sensing grating on the bottom surface of the reciprocating sealing groove, and then connect the leading ends of the optical fibers of the temperature sensing grating on the bottom surface and the strain sensing grating on the bottom surface of the sealing groove together from the end Lead out from the pre-opened fiber lead-out hole in the cover; 4) Laying of the strain sensing grating on the side of the sealing groove: ① Use a soft brush dipped in room temperature curing epoxy resin to evenly coat a layer in the circumferential groove of the end surface of the base body where the sensing grating is laid on the side of the sealing groove, ② Lay the strain sensing grating on the side of the sealing groove before it is cured, ③Pay epoxy resin so that its thickness is consistent with the radial thickness of the strain sensing grating on the side of the sealing groove. lead out; 5) Installation of the sensor on the bottom surface of the reciprocating sealing groove and the sensor on the side of the reciprocating sealing groove: The sensor on the bottom surface of the reciprocating seal groove and the sensor on the side of the reciprocating seal groove manufactured according to the above steps are installed in the seal groove of the cylinder head before installing the reciprocating seal groove bottom surface sensor, and then the reciprocating seal groove is installed Install, then install the side sensor of the reciprocating seal groove on the inner circumferential surface of the sensor on the bottom surface of the reciprocating seal groove, and ensure that the side sensor of the reciprocating seal groove can be in close contact with the left end face of the reciprocating seal. 2. The hydraulic reciprocating dynamic sealing state monitoring sensor according to claim 1, characterized in that said sensing gratings are all glued in grooves of corresponding laying substrates with epoxy resin. 3. The hydraulic reciprocating seal state monitoring sensor according to claim 1, characterized in that the reciprocating seal groove side sensor (6) and the reciprocating seal groove bottom surface sensor (5) are interference fit, so that Ensure that the sensing grating and the dynamic sealing working surface are kept in close contact, and at the same time ensure the relative positional relationship between the two sensors, so as to facilitate the extraction of optical fibers. 4. The hydraulic reciprocating dynamic sealing state monitoring sensor according to claim 1, characterized in that the side sensor (6) of the reciprocating dynamic sealing groove and the bottom surface sensor (5) of the reciprocating dynamic sealing groove, the axial position is determined by the end Cover (3) and connecting screws (10) to fix.