Sensor and system for metering shield tail grease injection amount
By designing gear-driven sensors and control systems in the shield machine, high-precision measurement and accurate point monitoring of the oil injection volume at the tail of the shield is achieved, and the problem of inaccurate oil injection volume monitoring in the existing technology is solved, ensuring that the shield is The normal operation of the organization.
Patent Information
- Application Number
- CN202411307758.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-19
- Publication Date
- 2024-12-27
AI Technical Summary
The monitoring of the amount of oil injection in existing shield machines is not accurate, especially the point monitoring cannot be carried out, which affects the normal operation of the machine.
Design a sensor including a housing, a volume chamber, an oil inlet interface, an oil outlet interface and a gear. The impact force of the flow of grease drives the gear rotation, detects the gear rotation speed to measure the grease flow, and combines it with a control system. Distributed monitoring and automatic adjustment.
High-precision measurement and accurate point monitoring of the amount of grease injection at the tail of the shield is realized, avoiding the problem of inaccurate injection due to wear of the grease pump, and automatically adjusting the status of the grease pump to ensure accurate injection at each point.
Smart Images
Figure CN119197672A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of shield construction, and in particular to a sensor and a system for measuring the injection amount of grease at a shield tail. Background Art
[0002] The shield tail grease system is a key part of the shield machine. Its main function is to seal the shield tail area of the shield machine to prevent groundwater and soil from entering the tunneling chamber of the shield machine, and also to prevent mud and other materials during the tunneling process from leaking into the surrounding strata.
[0003] Existing grease injection volume monitoring mostly adopts two methods:
[0004] 1. Most of the grease pumps are equipped with a counter to convert the number of grease pump strokes into the amount of grease injected. After a period of use, the seals in the pump body will wear to varying degrees. After the wear occurs, the amount of grease injected per stroke will become different. Therefore, this method of calculating the amount of grease injected by the number of strokes is not accurate, which leads to insufficient or excessive grease supply, affecting the normal operation of the shield machine.
[0005] 2. Install a pull-rope displacement sensor on the grease pump body to convert the grease pump's descending height into the grease injection volume. This method can accurately calculate the grease injection volume, but it can only monitor the total injection volume of a layer of grease, and cannot accurately monitor the point grease. Summary of the invention
[0006] In order to solve the above problems, the present invention provides a sensor and system for measuring the amount of grease injected into the shield tail, which has high measurement accuracy and can realize accurate monitoring of point grease.
[0007] The present invention is implemented by the following scheme: a sensor for measuring the amount of grease injected into the shield tail is used to be installed at a position where the amount of grease injected needs to be measured on the grease injection path, and the sensor includes:
[0008] A housing, wherein a volume cavity for grease to flow through is formed inside the housing, and an oil inlet interface and an oil outlet interface for accessing a path are provided on opposite sides of the housing, and the oil inlet interface and the oil outlet interface are both in communication with the volume cavity;
[0009] A gear that rotates using the impact force of grease flowing through the volume chamber as a driving force, and the gear is rotatably connected to the volume chamber;
[0010] A detection switch is used to detect the rotation speed of the gear and output the detection result in the form of an electrical signal, and the detection switch is arranged in the volume cavity.
[0011] A further improvement of the sensor for measuring the amount of grease injected into the shield tail of the present invention is that the housing is an integrally formed structure.
[0012] A further improvement of the sensor for measuring the amount of grease injected into the shield tail of the present invention is that the cross section of the volume cavity is elliptical.
[0013] A further improvement of the sensor for measuring the amount of grease injected into the shield tail of the present invention is that the gear is rotatably connected to the volume cavity via a rotating shaft, and the rotating shaft deviates from and is perpendicular to the line connecting the oil inlet interface and the oil outlet interface.
[0014] A further improvement of the sensor for measuring the amount of grease injected into the shield tail of the present invention is that: the number of the gears is two, and they are meshed with each other, the two gears are rotatably connected to the volume cavity through two parallel and spaced rotating shafts, and the two rotating shafts are symmetrically arranged on opposite sides of the line connecting the oil inlet interface and the oil outlet interface.
[0015] The present invention also provides a system for measuring the amount of grease injected into the shield tail, comprising:
[0016] The sensor for measuring the amount of grease injected into the shield tail as described above, wherein the sensor is installed on the grease injection path;
[0017] A control system for acquiring an electrical signal from a detection switch on the sensor and calculating the amount of grease injected based on the electrical signal, wherein the detection switch is connected to the control system.
[0018] A further improvement of the system for measuring the amount of grease injected into the shield tail of the present invention is that the number of the sensors is several, and the several sensors are installed one by one at the metering points arranged on the grease injection path, and the detection switches on the several sensors are all connected to the control system.
[0019] A further improvement of the system for measuring the amount of shield tail grease injected in the present invention is that: the control system is a shield tail grease control system.
[0020] The sensor of the present invention can convert the flow of grease into the rotation speed of the gear, and realize the measurement of the grease flow by detecting the rotation speed, with high measurement accuracy, and the sensor can be installed at any point that needs to be measured, and can realize accurate monitoring of the point grease. By using multiple sensors for distributed metering and combining with the control system for calculation, it is possible to fully monitor the grease injection amount at multiple points. Furthermore, the control system can also automatically adjust the working state of the grease pump based on the monitoring of the grease injection amount, so as to achieve accurate injection of grease at each point. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Figure 1A front cross-sectional view of the sensor of the present invention is shown.
[0022] Figure 2 The principle block diagram of the control system of the present invention is shown.
[0023] In the figure: 1, housing; 11, volume chamber; 12, oil inlet interface; 13, oil outlet interface; 2, gear; 21, rotating shaft; 22, gear blade. DETAILED DESCRIPTION
[0024] In order to solve the problem that the traditional grease injection amount metering method cannot accurately measure the point, the present invention provides a sensor and system for measuring the grease injection amount of the shield tail, which has high measurement accuracy and can realize accurate monitoring of the grease at the point. The sensor and system for measuring the grease injection amount of the shield tail are further described below with specific embodiments combined with the accompanying drawings.
[0025] See also Figure 1 As shown, a sensor for measuring the amount of grease injected into a shield tail is used to be installed at a position on the grease injection path where the amount of grease injected needs to be measured. The sensor includes: a housing 1, a volume chamber 11 for grease to flow through is formed inside the housing 1, an oil inlet interface 12 and an oil outlet interface 13 for accessing the path are provided on opposite sides of the housing 1, and the oil inlet interface 12 and the oil outlet interface 13 are both connected to the volume chamber 11; a gear 2 that rotates using the impact force of grease flowing through the volume chamber 11 as power, and the gear 2 is rotatably connected to the volume chamber 11; a detection switch (not shown in the figure) for detecting the rotation speed of the gear 2 and outputting the detection result in the form of an electrical signal, the detection switch can be a proximity switch, which is arranged in the volume chamber 11, and the working principle of the proximity switch detecting the gear rotation speed belongs to the prior art and is not repeated here.
[0026] Specifically, a fracture is formed at a position on the grease injection path where the amount of grease injection needs to be measured, the front end of the oil inlet interface 12 is connected to the front path of the fracture, and the rear end is connected to the volume chamber 11, the front end of the oil outlet interface 13 is connected to the volume chamber 11, and the rear end is connected to the rear path of the fracture, so that the flow direction of the grease in the volume chamber 11 is consistent with its flow direction on the grease injection path (i.e. Figure 1 In some embodiments, the gear 2 is a precision gear, and the number is two, and the two mesh with each other, such as Figure 1As shown, the two gears 2 are rotatably connected in the volume chamber 11 through two parallel rotating shafts 21 respectively arranged at intervals, and the two rotating shafts 21 are symmetrically arranged on opposite sides of the line connecting the oil inlet interface 12 and the oil outlet interface 13. Through the above design, the direction of the impact force on the gear when the grease flows in the volume chamber 11 (i.e., the direction of arrow A) is located at the center position between the two gears 2. When the grease flows in the volume chamber 11, the two gears 2 will be pushed at the same time and rotate in opposite directions. This movement mode makes the force on the housing 1 more balanced, ensuring the balance and stability of the overall structure of the sensor. Of course, if the force on the housing 1 is not considered, only one gear 2 can be set, but the rotating shaft 21 connecting the gear 2 needs to deviate from and be perpendicular to the line connecting the oil inlet interface 12 and the oil outlet interface 13, such as only retaining Figure 1 Any one of the gears 2. The purpose of this design is to make the flow resistance of the grease in the volume chamber 11 as small as possible, so that the grease impacts on the rotating blade 22 of the gear 2.
[0027] By using the above sensor, the grease flow rate can be converted into the rotation speed of the gear, and the grease flow rate can be measured by detecting the rotation speed. Because the volume of the volume cavity formed by the tooth profile of the gear and the housing is constant, and the rotational power of the gear is provided by the flow of grease, the grease flow rate is proportional to the rotation speed of the gear. By detecting the rotation speed of the gear, it can be converted into the grease flow rate. This metering method does not need to be limited by the wear of the grease pump, and has high metering accuracy. The sensor can be installed at any point that needs to be measured, and can achieve accurate monitoring of point grease.
[0028] Preferably: the shell 1 is an integrally formed structure, which can ensure the sealing performance of the volume chamber 11, so that the grease can only flow from the oil inlet interface 12 to the oil outlet interface 13. It is preferred to use a lantern-shaped shell, and the cross-section of the internal volume chamber 11 is elliptical to further reduce the resistance of the grease to flow in the volume chamber 11 and improve the measurement accuracy.
[0029] Based on the above sensor, a system for measuring the amount of grease injected into the shield tail is provided. Figure 2 As shown, it includes: a plurality of sensors, and a plurality of the sensors are installed one by one at the metering points arranged on the grease injection path; a control system for obtaining the electrical signals of the detection switches on each sensor and calculating the grease injection amount based on each electrical signal, and the detection switches on the plurality of sensors are connected to the control system. By using multiple sensors for distributed metering and combining the control system for calculation, the grease injection amount at multiple points can be fully monitored. Preferably, the control system is a shield tail grease control system PLC, so that the control system can also automatically adjust the working state of the grease pump based on the monitoring of the grease injection amount, so as to achieve accurate injection of grease at each point.
[0030] The present invention is described in detail above in conjunction with the embodiments of the drawings, and those skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute limitations of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.
Claims
1. A sensor for measuring the amount of grease injected into a shield tail, characterized in that: The sensor is used to be installed at a position on the grease injection path where the grease injection amount needs to be measured. The sensor includes: A housing, wherein a volume cavity for grease to flow through is formed inside the housing, and an oil inlet interface and an oil outlet interface for accessing a path are provided on opposite sides of the housing, and the oil inlet interface and the oil outlet interface are both in communication with the volume cavity; A gear that rotates using the impact force of grease flowing through the volume chamber as a driving force, and the gear is rotatably connected to the volume chamber; A detection switch is used to detect the rotation speed of the gear and output the detection result in the form of an electrical signal, and the detection switch is arranged in the volume cavity.
2. The sensor for measuring the amount of grease injected into the shield tail according to claim 1, characterized in that: The shell is an integrally formed structure.
3. The sensor for measuring the amount of grease injected into the shield tail according to claim 1, characterized in that: The cross section of the volume cavity is elliptical.
4. The sensor for measuring the amount of grease injected into the shield tail according to claim 1, characterized in that: The gear is rotatably connected in the volume chamber via a rotating shaft, and the rotating shaft deviates from and is perpendicular to a line connecting the oil inlet interface and the oil outlet interface.
5. The sensor for measuring the amount of grease injected into the shield tail according to claim 1, characterized in that: There are two gears which mesh with each other. The two gears are rotatably connected to the volume cavity through two parallel and spaced rotating shafts, and the two rotating shafts are symmetrically arranged on opposite sides of the line connecting the oil inlet interface and the oil outlet interface.
6. A system for measuring the amount of grease injected into the shield tail, characterized in that: include: A sensor for measuring the amount of grease injected into the shield tail according to any one of claims 1 to 5, wherein the sensor is installed on the grease injection path; A control system for acquiring an electrical signal from a detection switch on the sensor and calculating the amount of grease injected based on the electrical signal, wherein the detection switch is connected to the control system.
7. The system for measuring the amount of grease injected into the shield tail according to claim 6, characterized in that: The number of the sensors is several, and the sensors are installed one by one at the metering points arranged on the grease injection path, and the detection switches on the sensors are all connected to the control system.
8. The system for measuring the amount of grease injected into the shield tail according to claim 6, characterized in that: The control system is a shield tail grease control system.