Hydraulic damper capable of monitoring oil quantity and monitoring method thereof

Abstract

The invention discloses a hydraulic damper capable of monitoring oil mass and a monitoring method thereof. The hydraulic damper comprises a shell assembly, a piston rod, a main oil cylinder, an auxiliary oil cylinder device, an oil mass monitor, a movable rod valve seat, a valve element spring and a main cylinder end cover. The main oil cylinder is installed in the shell assembly, a main oil tank of the main oil cylinder is divided into two parts, the main cylinder end cover is used for sealing the main oil cylinder, and the valve element spring is arranged in the main cylinder end cover. A piston rod arranged in the main oil cylinder is connected with a piston, and the hydraulic flow is controlled through a movable rod valve seat; the auxiliary oil cylinder device is connected to the main oil cylinder to form a two-stage oil cylinder structure; the oil mass monitor is arranged at the bottom of the main oil cylinder or on the side wall of the bottom of the main oil cylinder. According to the method, the sealing performance and the internal oil quantity of the damper are calculated by measuring the internal pressure, and therefore the purpose of monitoring is achieved. Pressure data of an oil cylinder of the hydraulic damper are acquired through the sensor, the remaining oil amount is evaluated through internal pressure measurement, and therefore the performance and the service life of the hydraulic damper in the service period are judged.

Description

Technical Field

[0001] The invention relates to a hydraulic damper, in particular to a hydraulic damper capable of monitoring oil quantity and a monitoring method thereof. Background Art

[0002] In the fields of electric power, petrochemicals, etc., hydraulic dampers are widely used to effectively reduce or eliminate the vibration and impact of equipment to improve the stability of equipment operation. Hydraulic dampers are a kind of vibration reduction device that is sensitive to speed. When the pipeline or equipment is under normal thermal expansion, the hydraulic damper can move slowly; when the load is transient, the valve of the hydraulic damper will be activated, generating reverse resistance of the same magnitude as the vibration force, suppressing the pipeline or equipment from generating large vibrations, reducing the amplitude, and thus protecting the pipeline or equipment.

[0003] In actual use, the on-site environment is relatively harsh. After the hydraulic damper is installed on site, it is difficult to test its service performance, especially the remaining amount of internal hydraulic oil. Once the sealing of the hydraulic damper decreases or the remaining amount of hydraulic oil is insufficient, it will greatly affect its own performance and easily cause safety accidents. At present, the method of observing the oil level of the hydraulic damper mainly adopts the visual method. This method can only observe whether there is oil seepage or oil leakage on the outside of the cylinder, so as to judge the sealing performance of the damper. In addition, this method cannot determine the remaining oil amount of the hydraulic damper, and it is also impossible to determine the life and safety reliability of the hydraulic damper. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a hydraulic damper capable of monitoring the oil volume and a monitoring method thereof. The damper obtains the hydraulic damper cylinder pressure data through sensor collection and evaluates the remaining oil volume through internal pressure measurement, thereby achieving the judgment of the performance and life of the hydraulic damper during service and providing a basis for inspection and maintenance.

[0005] In order to achieve the above object, the present invention adopts the following technical solution:

[0006] The present invention provides a hydraulic damper capable of monitoring oil quantity, comprising a housing assembly, a piston rod, a main oil cylinder, an auxiliary oil cylinder device, an oil quantity monitor, a live rod valve seat, a valve core spring and a main cylinder end cover;

[0007] The master oil cylinder is installed in the housing assembly. The main oil tank of the master oil cylinder is divided into the main oil tank B and the main oil tank A. The main cylinder end cover is used to close the main oil cylinder. The valve core spring is arranged inside the main cylinder end cover. The piston rod arranged in the main oil cylinder is connected with the piston, and the hydraulic flow is controlled through the active rod valve seat.

[0008] The auxiliary oil cylinder device is connected to the main oil cylinder to form a double-stage oil cylinder structure;

[0009] The oil level monitor is arranged at the bottom of the main oil cylinder or at the side wall of the bottom of the main oil cylinder.

[0010] A further improvement of the present invention is that the housing assembly is an integral supporting structure of the hydraulic damper.

[0011] A further improvement of the present invention is that it also includes an elastic baffle, which is arranged in the main oil cylinder and is used to limit the movement range of the piston rod.

[0012] A further improvement of the present invention is that the auxiliary oil cylinder device includes an auxiliary oil cylinder, an auxiliary piston and an oil return spring, the auxiliary oil cylinder is connected to the main oil cylinder, the auxiliary piston can reciprocate in the auxiliary oil cylinder, and the oil return spring is used to reset the auxiliary piston.

[0013] A further improvement of the present invention is that it also includes a joint bearing and a pin head, the two joint bearings are respectively connected to the two ends of the housing component, one joint bearing is connected to the external mechanical component through the pin head, and the other joint bearing is connected to the root beam.

[0014] A further improvement of the present invention is that the oil level monitor includes a piezoelectric sensing device and a strain display instrument. The piezoelectric sensing device is fixed to the bottom or bottom side wall of the master cylinder. The piezoelectric sensing device passes through the housing assembly through a transmission wire, and the other end of the transmission wire is connected to the strain display instrument.

[0015] A further improvement of the present invention is that the oil level monitor further comprises a sealing cover plate, and the sealing of the piezoelectric sensing device is ensured by the sealing cover plate.

[0016] A further improvement of the present invention is that when the damper is in the Z direction, the piezoelectric sensing device is fixed to the bottom of the main oil cylinder.

[0017] A further improvement of the present invention is that when the damper is placed horizontally on site, the piezoelectric sensing device is fixed to the side wall of the bottom of the main oil cylinder.

[0018] The present invention also provides a monitoring method for a hydraulic damper capable of monitoring the oil quantity, comprising:

[0019] Step 1: Fix the piezoelectric sensing device inside the master cylinder according to the on-site installation direction of the damper;

[0020] Step 2: Connect the piezoelectric sensing device from the main oil cylinder opening to the damper external device interface through the transmission wire, and ensure the overall sealing of the damper by filling the sealing material;

[0021] Step 3: Stretch the damper to the maximum position, repeatedly evacuate the interior and fill it with hydraulic oil;

[0022] Step 4: Connect both ends of the hydraulic damper to the equipment end and the root beam position;

[0023] Step 5: Connect the strain display instrument to the equipment port to display the internal pressure of the oil cylinder;

[0024] Step 6: Calculate the internal oil volume by the internal pressure;

[0025] When the sealing performance is good,

[0026]

[0027] P: internal pressure;

[0028] F: rated load;

[0029] D: inner diameter of hydraulic cylinder;

[0030] When the sealing performance is damaged,

[0031] P=ρgh (2)

[0032] ρ: oil density;

[0033] g: gravitational acceleration, N / kg;

[0034] h: Remaining oil level;

[0035]

[0036] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0037] The hydraulic damper capable of monitoring the oil quantity and the monitoring method thereof described in the present invention are based on the internal pressure of the main oil cylinder transmitted by the piezoelectric sensing device, and evaluate the sealing performance of the damper and the change in the oil quantity by measuring the internal pressure, thereby monitoring the remaining oil quantity of the hydraulic damper. The internal pressure data obtained by the device is convenient and fast, and has the characteristics of high accuracy. Compared with traditional visual observation, this method is more intuitive and accurate in evaluating the sealing performance of the damper and the remaining oil quantity. At the same time, regular monitoring of the oil-leaking damper can roughly estimate the remaining life of the damper. When the remaining oil reaches the critical point, the damper should be repaired or replaced. It has significant maintenance guidance significance and is extremely practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 The present invention is a structural schematic diagram of a hydraulic damper capable of monitoring oil quantity.

[0040] Figure 2 for Figure 1 A magnified schematic diagram of position A in the middle.

[0041] Description of reference numerals:

[0042] 1. Auxiliary piston, 2. Oil return spring, 3. Auxiliary oil cylinder, 4. Main oil cylinder, 5. Housing assembly, 6. Spherical bearing, 7. Pin head, 8. Main oil tank B, 9. Piston rod, 10. Live rod valve seat, 11. Elastic baffle, 12. Main oil tank A, 13. Piezoelectric sensing device, 14. Valve core spring, 15. Oil level monitor, 16. Main cylinder end cover, 17. Sealing cover plate, 18. Transmission wire, 19. Strain display instrument. DETAILED DESCRIPTION

[0043] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0044] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0048] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0049] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0050] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0051] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0052] Example 1

[0053] refer to Figure 1 and Figure 2The present invention provides a hydraulic damper capable of monitoring oil quantity, comprising a housing assembly 5, a piston rod 9, a main oil cylinder 4, an auxiliary oil cylinder device, an oil quantity monitor 15, a live rod valve seat 10, a valve core spring 14 and a main cylinder end cover 16; the main oil cylinder 4 is installed in the housing assembly 5, the main oil tank of the main oil cylinder 4 is divided into a main oil tank B 8 and a main oil tank A 12, the main cylinder end cover 16 is used to close the main oil cylinder 4, and the valve core spring 14 is arranged inside the main cylinder end cover 16; the piston rod 9 arranged in the main oil cylinder 4 is connected with a piston, and the hydraulic flow is controlled by the live rod valve seat 10; the auxiliary oil cylinder device is connected to the main oil cylinder 4 to form a two-stage oil cylinder structure; the oil quantity monitor 15 is arranged at the bottom of the main oil cylinder or the side wall of the bottom of the main oil cylinder.

[0054] In this embodiment, the housing assembly 5 is an integral supporting structure of the hydraulic damper.

[0055] In this embodiment, an elastic baffle 11 is further included, which is arranged in the main oil cylinder 4 and is used to limit the movement range of the piston rod 9.

[0056] In this embodiment, the auxiliary cylinder device includes an auxiliary cylinder 3, an auxiliary piston 1 and an oil return spring 2. The auxiliary cylinder 3 is connected to the main cylinder 4. The auxiliary piston 1 can reciprocate in the auxiliary cylinder 3. The oil return spring 2 is used to reset the auxiliary piston 1.

[0057] In this embodiment, a joint bearing 6 and a pin head 7 are also included. The two joint bearings 6 are respectively connected to the two ends of the housing component 5. One joint bearing 6 is connected to the external mechanical component through the pin head 7, and the other joint bearing 6 is connected to the root beam.

[0058] Among them, the spherical plain bearing is also called the universal bearing, which is a spherical sliding bearing. Its sliding contact surface is an inner spherical surface and an outer spherical surface, mainly composed of an inner ring with an outer spherical surface and an outer ring with an inner spherical surface. The working principle of the spherical plain bearing is to transmit force and bear load through rolling friction. The rollers are distributed between the inner ring and the outer ring to form a friction contact surface. When external force acts on the shaft, relative sliding will occur between the inner ring and the outer ring. The rollers of the spherical plain bearing are usually cylindrical or conical. They can roll and rotate freely between the inner ring and the outer ring, thereby realizing the transmission of rotational force and load.

[0059] In this embodiment, the oil level monitor 15 includes a piezoelectric sensing device 13 and a strain display instrument 19. The piezoelectric sensing device 13 is fixed to the bottom or bottom side wall of the master cylinder 4. The piezoelectric sensing device 13 passes through the housing assembly 5 through a transmission wire 18, and the other end of the transmission wire 18 is connected to the strain display instrument 19.

[0060] The piezoelectric sensing device 13 is the core component of the oil level monitor 15, which is used to sense the change in the oil level in the master cylinder. When the oil level changes, the piezoelectric sensing device will sense the change in oil pressure and convert this pressure change into an electrical signal. The strain display instrument 19 is another key component of the oil level monitor 15. The strain display instrument 19 receives the electrical signal from the piezoelectric sensing device 13 and converts it into visual oil level information. By observing the display of the strain display instrument 19, the user can intuitively understand the oil level in the master cylinder 4. In other words, the oil level monitor 15 senses the change in oil level through the piezoelectric sensing device 13, and transmits the signal to the strain display instrument 19 for display through the transmission wire 18.

[0061] In this embodiment, the oil level monitor 15 further includes a sealing cover plate 17 , and the sealing cover plate 17 is used to ensure the sealing of the piezoelectric sensing device 13 .

[0062] In this embodiment, when the damper is placed horizontally on site, the piezoelectric sensing device 13 is fixed to the bottom of the main cylinder. When the damper is placed horizontally on site, the piezoelectric sensing device 13 is fixed to the side wall of the bottom of the main cylinder. The Z-direction damper mainly acts on the absorption and dissipation of vibration or impact energy in the Z-axis direction (i.e., the vertical direction). It can effectively reduce vibration, absorb impact energy, and improve the stability of the system. The horizontally placed damper can be evenly stressed, avoiding the reduction of damping effect or structural damage caused by uneven stress.

[0063] Example 2

[0064] refer to Figure 1 and Figure 2 The present invention provides a hydraulic damper capable of monitoring oil quantity, comprising a housing assembly 5, a piston rod 9, a main oil cylinder 4, a main oil tank 12A, a main oil tank B8, an auxiliary oil cylinder 3, an oil return spring 2, a live rod valve seat 10, a valve core spring 14, a piezoelectric sensing device 13, a sealing cover plate 17, a transmission wire 18 and a strain display instrument 19.

[0065] The main oil cylinder 4 is installed in the housing assembly 5. The housing assembly 5 is the overall support structure of the hydraulic damper and protects the internal components. The main oil tank of the main oil cylinder 4 is divided into the main oil tank B8 and the main oil tank A12. The hydraulic damping is controlled by the flow of oil. The main oil tank A12 is mainly responsible for the oil return process. The main cylinder end cover 16 is used to close the main oil cylinder 4 to ensure the sealing of the hydraulic system. The piston rod 9 is connected to the piston and controls the hydraulic flow through the live rod valve seat 10 to achieve different damping effects. The elastic baffle 11 is used to limit the range of motion of the piston rod 9 and provide a certain buffering effect. The valve core spring 14 is arranged inside the main cylinder end cover 16 and is responsible for controlling the flow of oil through the valve core and adjusting the damping effect. The auxiliary oil cylinder 3 is connected to the main oil cylinder 4 to form a two-stage oil cylinder structure, and is connected through the bottom opening to provide a staged damping effect. The auxiliary piston 1 reciprocates in the auxiliary oil cylinder 3 and realizes the hydraulic buffering effect through the flow of oil. The return oil spring 2 is used to reset the auxiliary piston 1 and provide elastic restoring force. The spherical bearing 6 is connected to the external mechanical parts through the pin head 7 to bear and transmit the movement force.

[0066] The oil level monitor 15 includes: a piezoelectric sensing device 13 fixed to the bottom of the main oil cylinder 4, the piezoelectric sensing device 13 passes through the housing assembly 5 through a transmission wire 18, and the sealing integrity of the piezoelectric sensing device 13 is ensured by a sealing cover plate 17, and the other end of the transmission wire 18 can be directly connected to a strain display instrument 19.

[0067] During the manufacturing process, the damper is stretched to its longest position, repeatedly evacuated and then filled with oil. When the damper is compressed, the hydraulic oil enters the main oil tank B8 and the auxiliary oil cylinder 3 through the active rod valve seat 10 and the valve core spring 14 respectively.

[0068] During the specific installation process of the present invention, the hydraulic damper is connected to the equipment end at one end through the joint bearings 6 on both sides, and the other end is connected to the root beam, and the cylinder moves following the displacement of the equipment end.

[0069] Example 3

[0070] refer to Figure 1 and Figure 2 The present invention provides a monitoring method for a hydraulic damper capable of monitoring the oil volume. The method measures the internal pressure to calculate the damper sealing performance and the internal oil volume, thereby achieving the purpose of monitoring. The method specifically includes:

[0071] Step 1: Fix the piezoelectric sensing device inside the master cylinder according to the on-site installation direction of the damper;

[0072] Step 2: Connect the piezoelectric sensing device from the main oil cylinder opening to the damper external device interface through the transmission wire, and ensure the overall sealing of the damper by filling the sealing material;

[0073] Step 3: Stretch the damper to the maximum position, repeatedly evacuate the interior and fill it with hydraulic oil;

[0074] Step 4: Connect both ends of the hydraulic damper to the equipment end and the root beam position;

[0075] Step 5: Connect the strain display instrument to the equipment port to display the internal pressure of the oil cylinder;

[0076] Step 6: Calculate the amount of oil inside by the internal pressure.

[0077] According to the current standard size of the damper or the actual manufacturing size, the internal pressure of the hydraulic damper when the sealing performance is good can be calculated by the internal pressure formula (1):

[0078]

[0079] P0: internal pressure;

[0080] F: rated load;

[0081] D: inner diameter of hydraulic cylinder;

[0082] When the value measured by the strain display instrument 19 is the same as or close to the calculated value P0, it can be judged that the sealing performance of the hydraulic damper is good and the internal oil volume is sufficient. When the sealing performance of the hydraulic damper is damaged, the value displayed by the strain display instrument 19 can be used to infer the residual height of the internal oil volume of the damper by using the liquid pressure calculation formulas (2) and (3), thereby calculating the remaining oil volume.

[0083] P=ρgh (2)

[0084] ρ: oil density;

[0085] g: gravitational acceleration, N / kg;

[0086] h: Remaining oil level;

[0087] V: Remaining oil volume;

[0088]

[0089] By monitoring the remaining oil amount in the damper, the dynamic changes of the internal oil amount can be accurately tracked, thereby inferring the remaining life of the damper and providing a scientific basis for its maintenance or replacement.

[0090] Example 4

[0091] A damper with a rated load of 48KN, a hydraulic cylinder inner diameter of 63mm, and a damping fluid density of 850-900kg / m 3The internal pressure formula (1) can be used to calculate that the internal pressure of the hydraulic damper when the sealing performance is good is about 15.41 MPa. When the value measured by the strain display instrument 19 is the same as or close to this value, it can be judged that the sealing performance of the hydraulic damper is good and the internal oil volume is sufficient.

[0092]

[0093] P0: internal pressure;

[0094] F: rated load;

[0095] D: inner diameter of hydraulic cylinder;

[0096] When the sealing performance of the hydraulic damper is damaged, assuming that there is no oil leakage at this time, that is, h is the oil tank height of 0.2m. Using the liquid pressure calculation formula (2), the internal pressure is about 170-180Pa. There is a huge gap compared with the good sealing performance.

[0097] P=ρgh (2)

[0098] ρ: oil density;

[0099] g: gravitational acceleration, N / kg;

[0100] h: Remaining oil level.

[0101] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0102] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A hydraulic damper capable of monitoring oil quantity, characterized in that: It includes a housing assembly, a piston rod, a main oil cylinder, an auxiliary oil cylinder device, an oil quantity monitor, a live rod valve seat, a valve core spring and a main cylinder end cover; The master oil cylinder is installed in the housing assembly. The main oil tank of the master oil cylinder is divided into the main oil tank B and the main oil tank A. The main cylinder end cover is used to close the main oil cylinder. The valve core spring is arranged inside the main cylinder end cover. The piston rod arranged in the main oil cylinder is connected with the piston, and the hydraulic flow is controlled through the active rod valve seat. The auxiliary oil cylinder device is connected to the main oil cylinder to form a double-stage oil cylinder structure; The oil level monitor is arranged at the bottom of the main oil cylinder or at the side wall of the bottom of the main oil cylinder.

2. A hydraulic damper capable of monitoring oil quantity according to claim 1, characterized in that: The housing assembly is the integral supporting structure of the hydraulic damper.

3. A hydraulic damper capable of monitoring oil quantity according to claim 1, characterized in that: It also includes an elastic baffle, which is arranged in the main oil cylinder and is used to limit the movement range of the piston rod.

4. A hydraulic damper capable of monitoring oil quantity according to claim 1, characterized in that: The auxiliary oil cylinder device comprises an auxiliary oil cylinder, an auxiliary piston and an oil return spring. The auxiliary oil cylinder is connected to the main oil cylinder. The auxiliary piston can reciprocate in the auxiliary oil cylinder. The oil return spring is used to reset the auxiliary piston.

5. The hydraulic damper capable of monitoring oil quantity according to claim 1, characterized in that: It also includes a joint bearing and a pin head. The two joint bearings are respectively connected to the two ends of the housing component, one joint bearing is connected to the external mechanical component through the pin head, and the other joint bearing is connected to the root beam.

6. A hydraulic damper capable of monitoring oil quantity according to claim 1, characterized in that: The oil level monitor includes a piezoelectric sensing device and a strain display instrument. The piezoelectric sensing device is fixed to the bottom or bottom side wall of the main oil cylinder. The piezoelectric sensing device passes through the housing assembly through a transmission wire, and the other end of the transmission wire is connected to the strain display instrument.

7. A hydraulic damper capable of monitoring oil quantity according to claim 6, characterized in that: The oil level monitor also includes a sealing cover plate, through which the sealing of the piezoelectric sensing device is ensured.

8. The hydraulic damper capable of monitoring oil quantity according to claim 6, characterized in that: When the site is a Z-direction damper, the piezoelectric sensing device is fixed to the bottom of the main cylinder.

9. The hydraulic damper capable of monitoring oil quantity according to claim 6, characterized in that: When the damper is placed horizontally on site, the piezoelectric sensing device is fixed to the bottom side wall of the main cylinder.

10. The method for monitoring a hydraulic damper capable of monitoring oil quantity as claimed in claim 6, characterized in that: include: Step 1: Fix the piezoelectric sensing device inside the master cylinder according to the on-site installation direction of the damper; Step 2: Connect the piezoelectric sensing device from the main oil cylinder opening to the damper external device interface through the transmission wire, and ensure the overall sealing of the damper by filling the sealing material; Step 3: Stretch the damper to the maximum position, repeatedly evacuate the interior and fill it with hydraulic oil; Step 4: Connect both ends of the hydraulic damper to the equipment end and the root beam position; Step 5: Connect the strain display instrument to the equipment port to display the internal pressure of the oil cylinder; Step 6: Calculate the internal oil volume by the internal pressure; When the sealing performance is good, P: internal pressure; F: rated load; D: inner diameter of hydraulic cylinder; When the sealing performance is damaged, P=ρgh (2) ρ: oil density; g: gravitational acceleration, N / kg; h: Remaining oil level;

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