Explosion-proof on-line monitoring adapter for excavator oil pipe

Abstract

The utility model discloses a crossover coupling for explosion-proof on-line monitoring of an excavator oil pipe, which relates to the technical field of excavator operation safety guarantee and comprises a main coupling body with a hollow cylindrical structure, and two ends of the main coupling body are respectively provided with an installation internal thread matched with an oil transportation hard pipe and an installation external thread matched with a hydraulic hose. A one-way valve assembly is arranged on the side wall of the hydraulic sensor in the radial direction and comprises a one-way valve body, a one-way valve element and a reset spring, a second inner threaded hole matched with the interface end of the hydraulic sensor is formed in the one-way valve body, the one-way valve element comprises a sliding column and a sealing pressing plate which are coaxially connected, and a plurality of circulation grooves are evenly formed in the outer circumference of the sliding column. The end, away from the sealing pressing plate, of the sliding column is arranged in the sliding hole in a sliding mode. The reset spring is used for providing elastic force enabling the sealing pressing plate to press the end, close to the sliding hole, of the one-way valve body. The adapter is used for realizing the switching of an oil transportation hard pipe and a hydraulic hose of the excavator, so that a hydraulic sensor can be conveniently mounted to monitor the pressure and the temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of excavator operation safety assurance, in particular to a conversion joint used for explosion-proof online monitoring of an excavator oil pipe. Background Art

[0002] The movement of an excavator's boom and bucket is driven by hydraulic cylinders. Oil pipes are typically routed to these actuators, and hydraulic hoses connect these to the cylinders for oil supply. The most common failure during excavator operation is the bursting of these hydraulic hoses. This can lead to wasteful hydraulic oil leakage and environmental pollution, necessitating construction suspension for replacement and repair, impacting both efficiency and the pace of construction. In actual construction, spare hydraulic hoses and hydraulic oil are often insufficient on site, leading to wasted time due to temporary provisioning in the event of a hose burst.

[0003] The main causes of excavator oil pipe bursts are high hydraulic pressure, high hydraulic temperature, hydraulic pipe corrosion, abnormal hydraulic pipe vibration, and hydraulic oil deterioration. These issues can be detected and avoided through routine inspections. Regarding hydraulic pressure and temperature, while some excavators are equipped with sensors for online monitoring, these sensors only monitor system pressure and temperature. Pipe bursts are often located at the actuator end of the system. Analysis reveals significant discrepancies between the local pressure and temperature at this actuator end and the system pressure and temperature. For example, during excavator operation, the bucket and boom frequently move, generating significant impact pressure in this area, often significantly higher than the system pressure. Furthermore, excavators often operate outdoors in high-temperature environments, where the local hydraulic temperature at the actuator end is also affected by the high temperature, resulting in the actual temperature at this location exceeding the overall system temperature. Therefore, existing pressure and temperature monitoring systems in excavators cannot accurately monitor the actual pressure and temperature within the hydraulic hose at the actuator end during operation, failing to provide effective early warning of pipe bursts.

[0004] Based on this, we considered installing a pressure sensor and a temperature sensor at the execution end to directly monitor the hydraulic conditions in the hose. By setting an early warning threshold, when the monitored pressure value exceeds the set threshold, the operation frequency is reduced to reduce the impact pressure. When the monitored temperature value exceeds the set threshold, the construction is suspended to allow enough cooling time. This method provides early warning and effectively reduces the frequency of pipe bursts. However, in actual implementation, the original method is to install a three-way connector to reserve an interface for installing a pressure sensor alone to achieve pressure monitoring, or to install a four-way connector to reserve two interfaces for installing a pressure sensor and a temperature sensor respectively to achieve simultaneous pressure and temperature monitoring. This solution still has the following defects in actual application:

[0005] First, the oil delivery pipe in existing excavators is rigidly mounted on the machine body, with a limited distance between them. Because the tee and cross joints have extended interface ends that extend laterally, they cannot be directly installed on the oil delivery pipe. The current method involves sequentially connecting a first hose, a tee (or cross joint), and a second hose to the output end of the oil delivery pipe, and then connecting the other end of the second hose to the actuator cylinder. This method uses flexible hoses at both ends of the tee (or cross joint), which is prone to vibration during operation, exacerbating abnormal vibrations in the entire passageway. Furthermore, the sensor connection on the tee (or cross joint) is not stable.

[0006] Secondly, due to the relatively high economic cost of the sensor, in order to avoid loss, the sensor is required to be removed after the construction is completed for recycling and storage, and then installed when it is used next time. After the sensor is removed, a sealing plug needs to be installed at the sensor interface of the three-way joint (or four-way joint) to prevent hydraulic oil leakage caused by misoperation when the sensor is not installed. The current method also has the problem of troublesome sensor disassembly and installation during each construction. Utility Model Content

[0007] The purpose of the utility model is to overcome the shortcomings of the existing technology and provide a conversion joint for explosion-proof online monitoring of excavator oil pipes. The conversion joint is installed between the existing excavator's oil delivery hard pipe and the cylinder hose for conversion. It is convenient to install hydraulic sensors for pressure and temperature detection on the conversion joint to monitor the hydraulic conditions in the cylinder hose online, and the excavator can still operate normally when the sensor is not installed.

[0008] The purpose of this utility model is achieved through the following technical solutions:

[0009] A conversion joint for explosion-proof online monitoring of excavator oil pipes, including a main joint body and a one-way valve assembly.

[0010] The main joint body is an axially hollow columnar structure, the inner wall of one end of the main joint body is processed with an internal mounting thread, the outer wall of the other end of the main joint body is processed with an external mounting thread, and a first internal threaded hole is processed radially in the middle of the main joint body, and the first internal threaded hole passes through the outer wall of the main joint body;

[0011] The one-way valve assembly includes a one-way valve body, a one-way valve core and a return spring. The one-way valve body is an axially hollow cylindrical structure, and a second internal threaded hole and a sliding hole are sequentially processed in the one-way valve body along the axial direction. The outer side of one end of the one-way valve body is processed with a first external thread adapted to the first internal threaded hole. The one-way valve core includes a coaxially connected sliding post and a sealing pressure plate, and a plurality of flow grooves are evenly distributed on the outer circumference of the sliding post. The end of the sliding post away from the sealing pressure plate is slidably arranged in the sliding hole, and the return spring is arranged in the sliding hole. The two ends of the return spring are respectively fixedly connected to the sliding post and the one-way valve body, and the return spring is used to provide an elastic force to press the sealing pressure plate toward the end of the one-way valve body close to the sliding hole.

[0012] The one-way valve body and the main joint body are threadedly connected via a first internal threaded hole and a first external thread, and the sealing pressure plate is arranged on a side of the main joint body close to the axis.

[0013] Furthermore, it also includes an oil delivery pipe and a hydraulic hose, one end of the oil delivery pipe is threadedly connected to the main joint body through the installation internal thread, and one end of the hydraulic hose is threadedly connected to the main joint body through the installation external thread.

[0014] Furthermore, it also includes a hydraulic sensor, a detection flow channel is set at the axial position of the hydraulic sensor, and a connecting screw is processed at one end of the hydraulic sensor, and the connecting screw is threadedly connected to the one-way valve body through the second internal threaded hole. When the thread is tightened, the end of the connecting screw can push open the one-way valve core to form a passage among the detection flow channel, the circulation groove and the hollow part of the main joint body.

[0015] Specifically, the main joint body is in the shape of a hexagonal prism.

[0016] Specifically, three first internal threaded holes are processed on the main joint body, and the three first internal threaded holes are evenly distributed around the circumference of the main joint body. The one-way valve assembly is installed in each of the three first internal threaded holes.

[0017] Specifically, a countersunk hole is processed on the main joint body, and the countersunk hole is arranged at the end of the first internal thread hole away from the axis of the main joint body; a sinking platform is formed on the end of the one-way valve body away from the first external thread, and the sinking platform is arranged in the countersunk hole.

[0018] Specifically, a first sealing ring groove is processed on an end surface of the sink away from the first external thread, and a second sealing ring groove is processed on an end surface of the sink close to the first external thread.

[0019] Specifically, a third sealing ring groove is processed at one end of the sealing pressure plate close to the sliding column.

[0020] The beneficial effects of the utility model are:

[0021] The conversion joint for explosion-proof online monitoring of excavator oil pipes includes a main joint body, which is a hollow cylindrical structure. The two ends of the main joint body are respectively processed with an internal installation thread adapted for the oil delivery pipe and an external installation thread adapted for the hydraulic hose. A one-way valve assembly is radially arranged on its side wall. The one-way valve assembly includes a one-way valve body, a one-way valve core and a return spring. A second internal threaded hole and a sliding hole are sequentially processed in the one-way valve body along the axial direction. The second internal threaded hole is adapted to the interface end of the hydraulic sensor. The one-way valve core includes a coaxially connected sliding column and a sealing pressure plate. A plurality of flow grooves are evenly distributed on the outer circumference of the sliding column. The end of the sliding column away from the sealing pressure plate can be slidably arranged in the sliding hole. The return spring is used to provide an elastic force to press the sealing pressure plate toward the end of the one-way valve body close to the sliding hole. The conversion joint can be directly installed on the end of the excavator's oil delivery pipe to achieve rigid fixation, and to transfer the oil delivery pipe and the hydraulic hose. It can be used normally when no sensor is installed. When the operation frequency is high or the temperature environment is high, a hydraulic sensor can be conveniently installed. When installing, the sealing pressure plate is pushed open at the hydraulic sensor interface end to connect the detection flow channel of the hydraulic sensor with the hollow inner cavity of the main joint body, so that the hydraulic pressure or temperature at the location can be directly monitored online to effectively warn of abnormal pressure or temperature and prevent pipe burst accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the appearance and structure of a conversion joint for explosion-proof online monitoring of excavator oil pipes in the utility model;

[0023] Figure 2 This is a schematic diagram of the internal structure of a conversion joint for explosion-proof online monitoring of excavator oil pipes in the utility model;

[0024] Figure 3 This is a schematic structural diagram of a one-way valve assembly in a conversion joint for explosion-proof online monitoring of an excavator oil pipe according to the present invention;

[0025] In the figure, 1-main joint body, 2-one-way valve assembly, 3-one-way valve body, 4-sealing pressure plate, 5-return spring, 6-sliding column, 11-installation internal thread, 12-installation external thread, 21-second internal thread hole, 22-sliding hole, 23-circulation groove, 24-first sealing ring groove, 25-second sealing ring groove, 26-third sealing ring groove. DETAILED DESCRIPTION

[0026] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0027] like Figures 1 to 3 As shown, a conversion joint for explosion-proof online monitoring of excavator oil pipes includes a main joint body 1 and a one-way valve assembly.

[0028] The main joint body 1 has an axially hollow columnar structure and can be directly made of pipe material. The inner wall of one end of the main joint body 1 is processed with an internal installation thread 11 that is compatible with the end interface of the excavator's oil delivery hard pipe, and the outer wall of the other end of the main joint body 1 is processed with an external installation thread 12 that is compatible with the end interface of the excavator's hydraulic hose. A first internal threaded hole is processed in the middle of the main joint body 1 along its radial direction. The first internal threaded hole penetrates the outer wall of the main joint body 1 to connect the internal hollow cavity of the main joint body 1 with the outside.

[0029] The one-way valve assembly 2 comprises a one-way valve body 3, a one-way valve core, and a return spring 5. The one-way valve body 3 is an axially hollow cylindrical structure. A second internally threaded hole 21 and a sliding hole 22 are machined into the one-way valve body 3 along its axis. The diameter of the second internally threaded hole 21 is larger than that of the sliding hole 22, and a stopper is formed at the junction of the two. A first external thread 23 is machined into the outer side of one end of the one-way valve body 3, which mates with the first internally threaded hole. The one-way valve core comprises a coaxially connected spool 6 and a sealing plate 4. The outer circumference of the spool 6 is uniformly defined with a plurality of flow grooves 23. The end of the spool 6, distal to the sealing plate 4, is slidably disposed within the sliding hole 55. The return spring 5 is disposed within the sliding hole 22. The two ends of the return spring 5 are fixedly connected to the spool 6 and the stopper in the one-way valve body 3, respectively. The return spring 5 is in a stretched state, providing a spring force that presses the sealing plate 4 against the end of the one-way valve body 3 proximal to the sliding hole 22.

[0030] During assembly, the one-way valve body 3 and the main joint body 1 are threadedly connected via the first external thread 23 and the first internal threaded hole, and the sealing pressure plate 4 is arranged on one side of the main joint body 1 close to the axis.

[0031] When in use, the conversion joint also includes the excavator's oil pipe and hydraulic hose. The main joint body 1 can be threadedly connected to the end of the oil pipe through the aforementioned installation internal thread 11, and the main joint body 1 can be threadedly connected to one end of the hydraulic hose through the aforementioned installation external thread 12. The other end of the hydraulic hose is connected to the actuator cylinder of the bucket or arm. Since the conversion joint adopts the form of a side wall opening to replace the horizontally extending structure of a conventional three-way joint (or four-way joint), it is not restricted by the installation position and can be directly installed at the end of the excavator's oil delivery pipe to achieve rigid fixation, thereby avoiding abnormal jitter caused by the installation of the sensor and ensuring stability after the sensor is installed; at the same time, since a one-way valve assembly 2 is provided in the side opening (first internal threaded hole) of the main joint body 1, when the sensor is not installed, the sealing pressure plate 4 is kept pressed against the end of the sliding hole 22 under the action of the return spring 5 to maintain sealing. It can be used normally without installing a sensor when the operation frequency is not high or the temperature environment is suitable. It should be understood that during use, the sliding column is radially limited in the sliding hole, and the hydraulic oil flowing through the main joint body 1 further axially presses the sealing pressure plate 4 to maintain good sealing.

[0032] When the operation frequency is high or the temperature environment is high, it is necessary to install a hydraulic sensor. The hydraulic sensor can be a pressure sensor or a temperature sensor according to actual needs. The hydraulic sensor is a commercially available original. Its basic principle is to set a detection channel at the axis position of the hydraulic sensor, and to detect pressure or temperature by passing hydraulic oil into the detection channel; a connecting screw is processed at one end of the hydraulic sensor, and the detection channel passes through the bottom center of the connecting screw to form an interface. During implementation, the aforementioned second internal threaded hole 21 can be processed to match the connecting screw of the hydraulic sensor, or the interface size of the hydraulic sensor can be customized according to the second internal threaded hole 21 when purchasing. Specifically, when installing the hydraulic sensor, the connecting screw of the hydraulic sensor is threadedly connected to the one-way valve body 3 through the second internal threaded hole 21. When the thread is tightened, the end of the connecting screw pushes open the one-way valve core, so that the detection channel, the flow groove 23 and the hollow part of the main joint body 1 form a passage, which can directly detect the hydraulic oil flowing through the hollow interior of the main joint body 1. The entire installation process is extremely convenient.

[0033] When implementing:

[0034] Since the distance between the oil delivery pipe of the excavator and the machine body is relatively close, in order to avoid interference, a countersunk hole is processed on the main joint body 1, and the countersunk hole is arranged at the end of the first internal thread hole away from the axis of the main joint body 1; a sinking platform is formed at the end of the one-way valve body 3 away from the first external thread, and the sinking platform is arranged in the countersunk hole.

[0035] The main joint body 1 is hexagonally shaped to facilitate tightening and installation on the end of the oil pipe, ensuring a tight seal after installation. This also facilitates clamping and machining when the side opening (the first internally threaded hole) is machined. Furthermore, the main joint body 1 is machined with three first internally threaded holes, evenly distributed around the circumference of the main joint body 1's axis. Each of the three first internally threaded holes houses a one-way valve assembly 2. This ensures that at least one one-way valve assembly 2 is located on the side of the main joint body 1 away from the excavator body when the main joint body 1 is tightened and installed on the oil pipe, facilitating the installation of the hydraulic sensor.

[0036] In terms of sealing, a first sealing ring groove 24 is processed on the end face of the sink away from the first external thread 23. After the sealing ring is installed, the end face sealing can be achieved when the hydraulic sensor is tightened there; a second sealing ring groove 25 is processed on the end face of the sink close to the first external thread 23. After the sealing ring is installed, the end face sealing can be directly achieved when the one-way valve assembly 2 is tightened and installed on the main joint body 1; a third sealing ring groove 26 is processed on the end of the sealing pressure plate 4 close to the sliding column. After the sealing ring is installed, the sealing pressure plate 4 can be reliably sealed at the end of the sliding hole 22 when the hydraulic sensor is not installed.

[0037] The above description is merely a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present invention can be used in various other combinations, modifications, and environments and can be modified within the scope of the concept described herein through the above teachings or techniques or knowledge in the relevant fields. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present invention are intended to be protected by the claims appended hereto.

Claims

1. A conversion joint for explosion-proof online monitoring of excavator oil pipes, characterized in that: Including main joint body and one-way valve assembly, The main joint body is an axially hollow columnar structure, the inner wall of one end of the main joint body is processed with an internal mounting thread, the outer wall of the other end of the main joint body is processed with an external mounting thread, and a first internal threaded hole is processed radially in the middle of the main joint body, and the first internal threaded hole passes through the outer wall of the main joint body; The one-way valve assembly includes a one-way valve body, a one-way valve core and a return spring. The one-way valve body is an axially hollow cylindrical structure, and a second internal threaded hole and a sliding hole are sequentially processed in the one-way valve body along the axial direction. The outer side of one end of the one-way valve body is processed with a first external thread adapted to the first internal threaded hole. The one-way valve core includes a coaxially connected sliding post and a sealing pressure plate, and a plurality of flow grooves are evenly distributed on the outer circumference of the sliding post. The end of the sliding post away from the sealing pressure plate is slidably arranged in the sliding hole, and the return spring is arranged in the sliding hole. The two ends of the return spring are respectively fixedly connected to the sliding post and the one-way valve body, and the return spring is used to provide an elastic force to press the sealing pressure plate toward the end of the one-way valve body close to the sliding hole. The one-way valve body and the main joint body are threadedly connected via a first internal threaded hole and a first external thread, and the sealing pressure plate is arranged on a side of the main joint body close to the axis.

2. The conversion joint for explosion-proof online monitoring of excavator oil pipes according to claim 1 is characterized in that: It also includes an oil delivery pipe and a hydraulic hose, one end of the oil delivery pipe is threadedly connected to the main joint body through the installation internal thread, and one end of the hydraulic hose is threadedly connected to the main joint body through the installation external thread.

3. The conversion joint for explosion-proof online monitoring of excavator oil pipes according to claim 2 is characterized in that: It also includes a hydraulic sensor, wherein a detection flow channel is provided at the axis position of the hydraulic sensor, and a connecting screw is processed at one end of the hydraulic sensor, and the connecting screw is threadedly connected to the one-way valve body through the second internal threaded hole. The end of the connecting screw rod can push open the one-way valve core when the thread is tightened, so that a passage is formed among the detection flow channel, the flow groove and the hollow part of the main joint body.

4. The conversion joint for explosion-proof online monitoring of excavator oil pipes according to claim 1 is characterized in that: The main joint body is in the shape of a hexagonal column.

5. The conversion joint for explosion-proof online monitoring of excavator oil pipes according to claim 4 is characterized in that: Three first internal threaded holes are processed on the main joint body, and the three first internal threaded holes are evenly distributed around the circumference of the main joint body. The one-way valve assembly is installed in each of the three first internal threaded holes.

6. The conversion joint for explosion-proof online monitoring of excavator oil pipes according to claim 1 is characterized in that: A countersunk hole is machined on the main joint body, and the countersunk hole is arranged at the end of the first internal thread hole away from the axis of the main joint body; a sinking platform is formed on the end of the one-way valve body away from the first external thread, and the sinking platform is arranged in the countersunk hole.

7. The conversion joint for explosion-proof online monitoring of excavator oil pipes according to claim 6 is characterized in that: A first sealing ring groove is processed on an end surface of the sink away from the first external thread, and a second sealing ring groove is processed on an end surface of the sink close to the first external thread.

8. The conversion joint for explosion-proof online monitoring of excavator oil pipes according to claim 1 is characterized in that: A third sealing ring groove is formed on one end of the sealing pressure plate close to the sliding column.

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