CN223375351U - A conversion joint for explosion-proof online monitoring of excavator oil pipes - Google Patents
A conversion joint for explosion-proof online monitoring of excavator oil pipesInfo
- Publication number
- CN223375351U CN223375351U CN202520114640.9U CN202520114640U CN223375351U CN 223375351 U CN223375351 U CN 223375351U CN 202520114640 U CN202520114640 U CN 202520114640U CN 223375351 U CN223375351 U CN 223375351U
- Authority
- CN
- China
- Prior art keywords
- way valve
- adapter
- main
- valve body
- excavator
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Earth Drilling (AREA)
Abstract
The utility model discloses an adapter for explosion-proof on-line monitoring of an oil pipe of an excavator, which relates to the technical field of operation safety guarantee of the excavator and comprises a main adapter body of a hollow columnar structure, wherein two ends of the main adapter body are respectively provided with an installation internal thread matched with an oil delivery hard pipe and an installation external thread matched with a hydraulic hose, the side wall of the main adapter body is radially provided with a one-way valve assembly, the one-way valve assembly comprises a one-way valve body, a one-way valve core and a return spring, a second internal threaded hole matched with an interface end of a hydraulic sensor is arranged in the one-way valve body, the one-way valve core comprises a sliding column and a sealing pressing plate which are coaxially connected, a plurality of circulation grooves are uniformly distributed on the periphery of the sliding column, one end of the sliding column, far away from the sealing pressing plate, is slidably arranged in the sliding hole, and the return spring is used for providing elastic force for enabling the sealing pressing plate to press one end of the one-way valve body, close to the sliding hole, which is used for realizing the transfer of the oil delivery hard pipe of the excavator and the hydraulic hose, so that the hydraulic sensor is conveniently installed for pressure and temperature monitoring.
Description
Technical Field
The utility model relates to the technical field of operation safety guarantee of an excavator, in particular to an adapter for on-line monitoring of explosion prevention of an oil pipe of the excavator.
Background
The boom and the bucket of the excavator are driven by hydraulic cylinders, and in the excavator, an oil delivery hard pipe is usually arranged near the execution hydraulic cylinders, and the oil delivery hard pipe is connected with the execution hydraulic cylinders through a hydraulic hose so as to realize oil supply. The most common faults are the hydraulic hose pipe explosion faults when the excavator works, leakage waste and environmental pollution of hydraulic oil can be caused after pipe explosion occurs, meanwhile, construction is required to be suspended for replacement and repair, construction efficiency and construction rhythm are affected, particularly in actual engineering, the situation that standby hydraulic oil pipes and hydraulic oil are insufficient in preparation frequently occurs in a construction site, and more time is wasted due to temporary allocation when pipe explosion occurs.
Regarding the reasons of pipe explosion of the oil pipe of the excavator, the problems of high hydraulic pressure, high hydraulic temperature, corrosion of the hydraulic pipe, abnormal vibration of the hydraulic pipe, deterioration of hydraulic oil and the like are mainly reflected in the aspects of the hydraulic pressure, the abnormal vibration of the hydraulic pipe, the deterioration of the hydraulic oil and the like, which can be found and avoided through daily inspection, while regarding the hydraulic pressure and the hydraulic temperature, although the corresponding sensors are arranged in some of the excavators for on-line monitoring, the monitored objects are only the system pressure and the system temperature, and the frequent position of pipe explosion accidents is usually located at the execution end of the system, and the local pressure, the temperature, the system pressure and the system temperature of the execution end are greatly different through analysis. For example, the excavator is frequently operated during operation, large impact pressure is generated in the local direction due to frequent operation, the impact pressure is often far higher than the system pressure, for example, the excavator is usually in open air operation, the local hydraulic temperature of the execution end is also affected by high-temperature environment during high-temperature environment operation, and the actual temperature at the local position is also higher than the overall system temperature. Therefore, the pressure and temperature monitoring system in the existing excavator cannot accurately monitor the actual pressure and the actual temperature in the hydraulic hose at the execution end during operation, and the pipe explosion fault cannot be effectively pre-warned.
Based on the above, the hydraulic condition in the hose is directly monitored by additionally arranging a pressure sensor and a temperature sensor at the execution end, the operation frequency is reduced to reduce the impact pressure when the monitored pressure value exceeds the set threshold value by setting the early warning threshold value, and the construction is paused to keep the cooling time when the monitored temperature value exceeds the set threshold value. Through this mode early warning in advance, effectively reduced the pipe bursting frequency, but when the concrete implementation, original mode is that pressure monitoring is realized to the pressure sensor that installs additional alone through the mode that installs tee joint additional sets aside the interface, or the mode that installs four-way joint additional sets aside two interfaces and installs pressure sensor and temperature sensor additional respectively and realize pressure, temperature's control simultaneously, and this scheme still has following defect in practical application:
Firstly, in the existing excavator, the oil conveying hard pipe is rigidly arranged on the machine body, the distance between the oil conveying hard pipe and the machine body is limited, and the three-way joint and the four-way joint transversely extend out due to the reserved joint ends, so that the three-way joint and the four-way joint cannot be directly arranged on the oil conveying hard pipe. The two ends of the three-way joint (or the four-way joint) are flexible hoses, the part is easy to shake during operation, the abnormal vibration of the whole passage during operation is aggravated, and the connection of the sensor on the three-way joint (or the four-way joint) is not stable enough.
Secondly, because the economic cost of the sensor is relatively high, the sensor is required to be dismantled for recycling after construction is completed to avoid losing, and then the sensor is installed when being used next time, and after the sensor is dismantled, a sealing plug is additionally arranged at a sensor interface of a three-way joint (or a four-way joint) to prevent hydraulic oil leakage caused by misoperation when the sensor is not installed, and the problem of troublesome disassembly and assembly of the sensor exists in the current mode.
Disclosure of utility model
The utility model aims to overcome the defects of the prior art, and provides an adapter for the explosion-proof on-line monitoring of an oil pipe of an excavator, which is arranged between an oil transportation hard pipe and an oil cylinder hose of the existing excavator for switching, can be conveniently provided with a hydraulic sensor for detecting pressure and temperature on the adapter for on-line monitoring of the hydraulic condition in the oil cylinder hose, and can still normally operate when the sensor is not arranged.
The aim of the utility model is realized by the following technical scheme:
An adapter for the explosion-proof on-line monitoring of an oil pipe of an excavator comprises a main adapter body and a one-way valve assembly,
The main joint body is of an axial hollow columnar structure, an inner wall at one end of the main joint body is provided with an installation inner thread, an outer wall at the other end of the main joint body is provided with an installation outer thread, the middle part of the main joint body is provided with a first inner threaded hole in the radial direction, and the first inner threaded hole penetrates through the outer wall of the main joint body;
The one-way valve assembly comprises a one-way valve body, a one-way valve core and a return spring, wherein the one-way valve body is of an axially hollow columnar structure, a second internal threaded hole and a sliding hole are sequentially formed in the one-way valve body along the axial direction, a first external thread matched with the first internal threaded hole is formed at the outer side of one end of the one-way valve body, the one-way valve core comprises a sliding column and a sealing pressing plate which are coaxially connected, a plurality of circulation grooves are uniformly distributed on the circumference of the outer periphery of the sliding column, one end, far away from the sealing pressing plate, of the sliding column is slidably arranged in the sliding hole, the return spring is arranged in the sliding hole, two ends of the return spring are fixedly connected with the sliding column and the one-way valve body respectively, and the return spring is used for providing elastic force for enabling the sealing pressing plate to press towards one end part, close to the sliding hole, of the one-way valve body;
The one-way valve body is in threaded connection with the main joint body through a first internal threaded hole and a first external thread, and the sealing pressing plate is arranged on one side, close to the axis, of the main joint body.
Further, the hydraulic hose further comprises an oil transportation hard pipe and a hydraulic hose, one end of the oil transportation hard pipe is in threaded connection with the main joint body through the installation internal thread, and one end of the hydraulic hose is in threaded connection with the main joint body through the installation external thread.
Further, the hydraulic pressure sensor is further provided with a detection flow channel at the axial position, a connecting screw is machined at one end of the hydraulic pressure sensor, the connecting screw is in threaded connection with the one-way valve body through the second internal threaded hole, and the end part of the connecting screw can jack the one-way valve core to enable the detection flow channel, the circulation groove and the hollow part of the main joint body to form a passage when the threads are screwed up.
Specifically, the main joint body is in a hexagonal prism shape.
Specifically, the main joint body is provided with three first internal threaded holes, the three first internal threaded holes are uniformly distributed around the axis of the main joint body, and the three first internal threaded holes are respectively provided with the one-way valve assembly.
Specifically, a counter bore is machined in the main joint body, the counter bore is arranged at one end of the first internal threaded hole, which is far away from the axis of the main joint body, a sinking table is formed at one end of the one-way valve body, which is far away from the first external threads, and the sinking table is arranged in the counter bore.
Specifically, the end face of one end of the sinking platform far away from the first external thread is provided with a first sealing ring groove, and the end face of one end of the sinking platform close to the first external thread is provided with a second sealing ring groove.
Specifically, a third sealing ring groove is formed in one end, close to the sliding column, of the sealing pressing plate.
The beneficial effects of the utility model are as follows:
this an adapter for explosion-proof on-line monitoring of excavator oil pipe, including the main joint body, the main joint body is cavity columnar structure, and its both ends are processed respectively have with the installation internal thread of defeated oil hard tube adaptation and with the installation external screw thread of hydraulic hose adaptation, and its lateral wall is provided with the check valve subassembly along radial, and this check valve subassembly includes check valve body, check valve core and reset spring, the second internal thread hole and slide hole have been processed in proper order along the axis direction in the check valve body, and second internal thread hole and hydraulic sensor's interface end adaptation, the check valve core includes coaxial coupling's slide post and sealing clamp plate, and a plurality of circulation grooves have been seted up to the periphery circumference equipartition of slide post, and the one end slidable setting that sealing clamp plate was kept away from to the slide post is in the slide hole, and reset spring is used for providing to make sealing clamp plate to the one end tip that the check valve body is close to the slide hole compresses tightly. The adapter can be directly installed at the end part of an oil transportation hard pipe of an excavator to realize rigid fixation, is used for switching the oil transportation hard pipe and a hydraulic hose, can be normally used when a sensor is not installed, can be conveniently additionally installed with the hydraulic sensor when the operation frequency is high or the temperature environment is high, and can enable a detection flow passage of the hydraulic sensor to be communicated with a hollow inner cavity of a main adapter body through a sealing pressing plate propped up by an interface end of the hydraulic sensor when the hydraulic sensor is additionally installed, so that the hydraulic pressure or the temperature at the position is directly monitored on line to effectively early warn the abnormal pressure or the abnormal temperature, and prevent the occurrence of pipe explosion accidents.
Drawings
FIG. 1 is a schematic view of the external appearance structure of an adapter for on-line monitoring of explosion protection of an oil pipe of an excavator;
FIG. 2 is a schematic diagram of the internal structure of an adapter for on-line monitoring of an oil pipe explosion protection of an excavator in accordance with the present utility model;
FIG. 3 is a schematic structural view of a check valve assembly in an adapter for on-line monitoring of an explosion protection of an oil pipe of an excavator in accordance with the present utility model;
In the figure, the main joint body is 1-, the one-way valve assembly is 2-, the one-way valve body is 3-, the 4-seal clamp plate, the 5-reset spring, the 6-slide column, the 11-installation internal thread, the 12-installation external thread, the 21-second internal thread hole, the 22-slide hole, the 23-circulation groove, the 24-first seal ring groove, the 25-second seal ring groove and the 26-third seal ring groove.
Detailed Description
The technical solution of the present utility model will be described in further detail with reference to the accompanying drawings, but the scope of the present utility model is not limited to the following description.
As shown in fig. 1 to 3, an adapter for on-line monitoring of explosion protection of an oil pipe of an excavator comprises a main adapter body 1 and a one-way valve assembly.
The main joint body 1 is of an axial hollow columnar structure and can be directly manufactured by pipe material processing, an installation internal thread 11 matched with an end connector of an oil conveying hard pipe of an excavator is processed on the inner wall of one end of the main joint body 1, an installation external thread 12 matched with an end connector of a hydraulic hose of the excavator is processed on the outer wall of the other end of the main joint body 1, a first internal thread hole is processed in the middle of the main joint body 1 along the radial direction of the main joint body, and the first internal thread hole penetrates through the outer wall of the main joint body 1 to enable an internal hollow cavity of the main joint body 1 to be communicated with the outside.
The check valve assembly 2 includes a check valve body 3, a check valve spool, and a return spring 5. The check valve body 3 is the hollow columnar structure of axial, has processed second internal thread hole 21 and slide hole 22 in proper order along the axis direction in the check valve body 3, and the aperture of second internal thread hole 21 is greater than the aperture of slide hole 22, and both junction department forms spacing boss, and the one end outside of check valve body 3 is processed has the first external screw thread 23 with first internal thread hole adaptation. The unidirectional valve core comprises a sliding column 6 and a sealing pressing plate 4 which are coaxially connected, a plurality of circulation grooves 23 are uniformly distributed on the periphery circumference of the sliding column 6, one end of the sliding column 6, which is far away from the sealing pressing plate 4, is slidably arranged in a sliding hole 55, a return spring 5 is arranged in the sliding hole 22, two ends of the return spring 5 are fixedly connected with limiting bosses in the sliding column 6 and the unidirectional valve body 3 respectively, and the return spring 5 is in a stretching state and is used for providing elastic force for enabling the sealing pressing plate 4 to press towards one end part of the unidirectional valve body 3, which is close to the sliding hole 22.
When assembled, the check valve body 3 and the main joint body 1 are in threaded connection through the first external thread 23 and the first internal thread hole, and the sealing pressing plate 4 is arranged on one side, close to the axis, of the main joint body 1.
When the adapter is used, the adapter further comprises an oil conveying hard pipe and a hydraulic hose of the excavator, the main adapter body 1 can be connected with the end part of the oil conveying hard pipe in a threaded mode through the installation internal threads 11, the main adapter body 1 can be connected with one end of the hydraulic hose in a threaded mode through the installation external threads 12, and the other end of the hydraulic hose is connected to an execution oil cylinder of the bucket or the movable arm. The adapter adopts a lateral wall opening mode to replace a transverse extending structure of a conventional three-way joint (or four-way joint), is not limited by an installation position, can be directly installed at the end part of an oil transportation hard pipe of an excavator to realize rigid fixation, avoids abnormal shake caused by additional installation of a sensor, and also ensures stability after the sensor is installed, meanwhile, due to the fact that the one-way valve assembly 2 is arranged in a lateral opening (a first internal threaded hole) of the main joint body 1, when the sensor is not installed, the sealing pressing plate 4 is kept pressed at the end part of the sliding hole 22 under the action of the reset spring 5 to keep sealing, and the adapter can be normally used without additional installation of the sensor under the condition of low operation frequency or proper temperature environment.
When the operation frequency is high or the temperature environment is high, a hydraulic sensor needs to be additionally arranged, and the hydraulic sensor selects the pressure sensor or the temperature sensor according to actual needs. The hydraulic sensor is a commercially available original, the basic principle is that a detection flow channel is arranged at the axial position of the hydraulic sensor, pressure or temperature detection is carried out by leading hydraulic oil into the detection flow channel, a connecting screw is processed at one end of the hydraulic sensor, the detection flow channel penetrates through the center of the bottom of the connecting screw to form an interface, the second internal threaded hole 21 can be processed to be matched with the connecting screw of the hydraulic sensor in implementation, and the interface size of the hydraulic sensor can be customized according to the second internal threaded hole 21 in purchasing. Specifically when installing hydraulic pressure sensor additional, hydraulic pressure sensor's connecting screw passes through this second internal thread hole 21 and check valve body 3 threaded connection, and the tip of connecting screw pushes away the check valve core when the screw thread is screwed up, makes detection runner, circulation groove 23 and the well hollow of main joint body 1 form the passageway, can directly detect the hydraulic oil that main joint body 1 cavity inside flowed through, and whole installation process is very convenient additional.
The specific implementation method comprises the following steps:
Because the distance between the oil conveying hard pipe of the excavator and the excavator body is relatively short, in order to avoid interference, a counter bore is machined on the main joint body 1 and is arranged at one end of the first internal threaded hole far away from the axis of the main joint body 1, a sinking table is formed at one end of the one-way valve body 3 far away from the first external threads, and the sinking table is arranged in the counter bore.
The main joint body 1 is in a hexagonal prism shape so as to be convenient to screw and mount at the end part of the oil transportation hard pipe to ensure the tightness after mounting, and simultaneously, the clamping and the processing process are also convenient when the side is provided with a hole (a first internal threaded hole). Further, processing has three first internal thread holes on the main joint body 1, and three first internal thread holes uses the axis of the main joint body 1 as central circumference equipartition, and check valve assembly 2 is all installed to three first internal thread holes, can guarantee when screwing up main joint body 1 and install on defeated oil hard tube that at least one check valve assembly 2 is located the main joint body 1 and keeps away from one side of excavator organism to make things convenient for hydraulic sensor's installation.
In terms of sealing, a first sealing ring groove 24 is formed in the end face of one end, far away from the first external thread 23, of the sinking platform, end face sealing can be achieved when the hydraulic sensor is screwed in the first sealing ring groove after the sealing ring is additionally arranged, a second sealing ring groove 25 is formed in the end face of one end, close to the first external thread 23, of the sinking platform, end face sealing can be achieved when the one-way valve assembly 2 is screwed in the main joint body 1 after the sealing ring is additionally arranged, a third sealing ring groove 26 is formed in the end, close to the sliding column, of the sealing pressing plate 4, and reliable sealing of the end portion of the sliding hole 22, close to the sliding column, of the sealing pressing plate 4 can be achieved when the hydraulic sensor is not arranged after the sealing ring is additionally arranged.
The foregoing is merely a preferred embodiment of the utility model, and it is to be understood that the utility model is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the utility model are intended to be within the scope of the appended claims.
Claims (8)
1. An adapter for the explosion-proof on-line monitoring of an oil pipe of an excavator is characterized by comprising a main adapter body and a one-way valve assembly,
The main joint body is of an axial hollow columnar structure, an inner wall at one end of the main joint body is provided with an installation inner thread, an outer wall at the other end of the main joint body is provided with an installation outer thread, the middle part of the main joint body is provided with a first inner threaded hole in the radial direction, and the first inner threaded hole penetrates through the outer wall of the main joint body;
The one-way valve assembly comprises a one-way valve body, a one-way valve core and a return spring, wherein the one-way valve body is of an axially hollow columnar structure, a second internal threaded hole and a sliding hole are sequentially formed in the one-way valve body along the axial direction, a first external thread matched with the first internal threaded hole is formed at the outer side of one end of the one-way valve body, the one-way valve core comprises a sliding column and a sealing pressing plate which are coaxially connected, a plurality of circulation grooves are uniformly distributed on the circumference of the outer periphery of the sliding column, one end, far away from the sealing pressing plate, of the sliding column is slidably arranged in the sliding hole, the return spring is arranged in the sliding hole, two ends of the return spring are fixedly connected with the sliding column and the one-way valve body respectively, and the return spring is used for providing elastic force for enabling the sealing pressing plate to press towards one end part, close to the sliding hole, of the one-way valve body;
The one-way valve body is in threaded connection with the main joint body through a first internal threaded hole and a first external thread, and the sealing pressing plate is arranged on one side, close to the axis, of the main joint body.
2. The adapter for on-line monitoring of an oil pipe of an excavator according to claim 1, further comprising an oil delivery hard pipe and a hydraulic hose, wherein one end of the oil delivery hard pipe is in threaded connection with the main adapter body through the installation internal thread, and one end of the hydraulic hose is in threaded connection with the main adapter body through the installation external thread.
3. The adapter for on-line monitoring of oil pipe explosion protection of an excavator according to claim 2, further comprising a hydraulic sensor, wherein a detection flow passage is arranged at the axial position of the hydraulic sensor, a connecting screw is processed at one end of the hydraulic sensor, the connecting screw is in threaded connection with the one-way valve body through the second internal threaded hole,
The end part of the connecting screw rod can jack the one-way valve core when the threads are screwed up, so that a passage is formed by the detection flow passage, the circulation groove and the hollow part of the main joint body.
4. The adapter for on-line monitoring of an oil pipe explosion protection of an excavator according to claim 1, wherein the main adapter body has a hexagonal prism shape.
5. The adapter for on-line monitoring of explosion prevention of an oil pipe of an excavator according to claim 4, wherein three first internal threaded holes are machined in the main adapter body, the three first internal threaded holes are uniformly distributed circumferentially with the axis of the main adapter body as a center, and the check valve assembly is installed in each of the three first internal threaded holes.
6. The adapter for on-line monitoring of explosion prevention of an oil pipe of an excavator according to claim 1, wherein a counter bore is formed in the main adapter body, the counter bore is arranged at one end of the first internal threaded hole far away from the axis of the main adapter body, a sinking table is formed at one end of the one-way valve body far away from the first external thread, and the sinking table is arranged in the counter bore.
7. The adapter for on-line monitoring of an oil pipe explosion protection of an excavator according to claim 6, wherein a first seal ring groove is formed in an end face of the sinking platform far away from the first external thread, and a second seal ring groove is formed in an end face of the sinking platform near to the first external thread.
8. The adapter for on-line monitoring of an oil pipe explosion protection of an excavator according to claim 1, wherein a third seal ring groove is formed in one end of the seal pressing plate, which is close to the sliding column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202520114640.9U CN223375351U (en) | 2025-01-17 | 2025-01-17 | A conversion joint for explosion-proof online monitoring of excavator oil pipes |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202520114640.9U CN223375351U (en) | 2025-01-17 | 2025-01-17 | A conversion joint for explosion-proof online monitoring of excavator oil pipes |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN223375351U true CN223375351U (en) | 2025-09-23 |
Family
ID=97091862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202520114640.9U Active CN223375351U (en) | 2025-01-17 | 2025-01-17 | A conversion joint for explosion-proof online monitoring of excavator oil pipes |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN223375351U (en) |
-
2025
- 2025-01-17 CN CN202520114640.9U patent/CN223375351U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210153402U (en) | Extrusion type sealing blind plate | |
| CN223375351U (en) | A conversion joint for explosion-proof online monitoring of excavator oil pipes | |
| CN111006823A (en) | Self-sealing test flange and sealing monitoring method | |
| CN103558090B (en) | The single seam crossing water test unit of major diameter bearing pipe and hydraulic test method | |
| CN205192696U (en) | Detection apparatus for pipeline under pressure | |
| CN206669215U (en) | Valve is blocked up in a kind of water pressure test | |
| CN210322216U (en) | Special tool for checking leakage of cooling water pipe of hydrogen cooler of generator | |
| CN218863497U (en) | Intelligent groove clamp | |
| CN213336683U (en) | A pressure test tool for tube bundles of air coolers | |
| CN215811481U (en) | Water cooler cooling tube leak hunting device | |
| CN212933729U (en) | A safety monitoring system for gas leakage alarm in long-distance natural gas pipeline network | |
| CN111272361B (en) | Single tube pressure test and leakage detection tool for tube type heat exchanger | |
| CN210510631U (en) | Flange convenient to install | |
| CN223881471U (en) | Hydraulic cylinder internal leakage measuring device | |
| CN218152950U (en) | Mining type confluence assembly matched with connecting pipe | |
| CN203717303U (en) | Electric pump with controller | |
| CN211624304U (en) | Check valve capable of detecting pressure | |
| CN223165426U (en) | Drainage pipe leakage detection device | |
| CN218381485U (en) | Pressure leakage test tool | |
| CN223270309U (en) | A pressure detection component for rock drill measurement and control | |
| CN219453684U (en) | Heating power pipeline leakage detection equipment | |
| CN221055551U (en) | Calcium carbide furnace circulating water system | |
| CN221404685U (en) | Breather valve on-line checking tool connecting device | |
| CN223861214U (en) | A fire protection construction pressure pipeline monitoring device | |
| CN219453687U (en) | Pipe network leakage point monitoring and early warning system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |