An intelligent radio-controlled elevator

Abstract

The present invention discloses an intelligent wireless controlled elevator, which belongs to the field of oil drilling technology. The elevator comprises an elevator body, a symmetrically hinged door body, a bushing assembly, a pushing assembly, a micro hydraulic station and an accumulator pressure control system. The bushing assembly is mounted on the elevator body and the door body via a pin shaft, and its slot design enables precise positioning of the drill string. The pushing assembly drives a push plate via a hydraulic cylinder, which links the door body to open and close, resulting in a compact structure. The micro hydraulic station integrates an accumulator and a wireless control device, replacing a traditional large hydraulic system. The accumulator pressure control system constructs a dynamic control model through multi-source data fusion, comprising a data acquisition module, a data processing module, a viscosity / vibration reliability analysis module, a pressure stability analysis module and a pressure adjustment module. The model calculates oil reliability and vibration reliability in real time, dynamically allocates weights to optimize the pressure stability coefficient, and ultimately outputs a target pressure and adjusts the accumulator state.

Description

Technical Field

[0001] The invention belongs to the technical field of oil drilling, and in particular relates to an intelligent radio-controlled elevator. Background Art

[0002] In oil drilling operations, elevators are critical tools for lifting and lowering drill strings, and their performance directly impacts operational efficiency and safety. Currently, widely used hydraulic elevators use hydraulic actuation to open and close valves. However, these elevators rely on large hydraulic stations, complex hydraulic piping, and valve systems, resulting in cumbersome and costly structures and difficulty implementing remote intelligent control. Traditional hydraulic elevators require independent hydraulic power units, resulting in cumbersome on-site wiring, difficult maintenance, and prone to failures due to leaks or contamination in the hydraulic piping. Summary of the Invention

[0003] In view of the deficiencies in the prior art, the present invention provides an intelligent wireless controlled elevator to solve the above problems.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: an intelligent wireless controlled elevator, comprising an elevator body, two door bodies symmetrically mounted on the elevator body via a rotating axis A, and a suspension rod mounted on the elevator body, and further comprising:

[0005] A pushing assembly, mounted on the elevator body, for pushing the two door bodies to rotate around the rotation axis A;

[0006] The flip assembly is installed on the boom and is used to push the elevator body to rotate around the connection with the boom;

[0007] The micro hydraulic station is installed on the elevator body and includes a hydraulic station body, an accumulator installed on the hydraulic station body, and a wireless control device;

[0008] The accumulator is provided with an accumulator pressure control system for dynamically regulating the hydraulic oil pressure in the accumulator, including:

[0009] The viscosity reliability analysis module obtains the oil viscosity reliability based on the oil temperature fluctuation index in the accumulator and the accumulator operating frequency index;

[0010] The vibration reliability analysis module obtains vibration reliability based on the flow fluctuation index of the accumulator, the oil cleanliness index, and the voltage fluctuation index of the micro hydraulic station;

[0011] The pressure stability analysis module constructs a pressure stability analysis model based on the vibration index of the accumulator and the viscosity index of the oil in it, and dynamically allocates the weights of the oil viscosity reliability and vibration reliability in the pressure stability analysis model to obtain the dynamic pressure stability coefficient;

[0012] The pressure adjustment module obtains the accumulator target pressure according to the preset accumulator required pressure and the pressure stability coefficient and adjusts the accumulator pressure to the target pressure.

[0013] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:

[0014] Further technical solution: The accumulator pressure control system further includes:

[0015] A data acquisition module is used to obtain information on the viscosity of the oil in the accumulator, information on oil temperature fluctuations, information on oil cleanliness, information on flow fluctuations of the oil filling the accumulator, information on voltage fluctuations of the micro hydraulic station, information on accumulator vibrations, and information on the operating frequency of the accumulator;

[0016] The data processing module is used to process the information obtained by the data acquisition module to obtain the oil viscosity index, oil temperature fluctuation index, oil cleanliness index, flow fluctuation index, voltage fluctuation index, vibration index and accumulator operating frequency index.

[0017] Further technical solution: The flipping assembly includes an installation box, a hydraulic cylinder B, a triangular push block and a connecting push block. The installation box can be detachably installed on the boom. The top of the triangular push block is hinged to the output shaft of the hydraulic cylinder B. One side end of the triangular push block is rotatably connected to the installation box through a rotating shaft C. The other side end of the triangular push block is hinged with an arc-shaped push block. A step is provided on the arc-shaped push block to facilitate the pushing of the triangular push block. The end of the arc-shaped push block is hinged with a push block. The push block is hinged to the connecting push block through a rotating shaft D. The rotating shaft D is rotatably connected to the installation box. The push block is located in a push groove provided on the connecting push block and the end face of the push groove is an inclined surface. The hydraulic cylinder B is connected to the micro hydraulic station through an oil circuit assembly.

[0018] A further technical solution includes two sets of bushing assemblies, which are correspondingly mounted on the elevator body and the door body. The bushing assemblies include bushings and pins. The two sets of bushings are correspondingly mounted on the elevator body and the door body through the pins. The bushings are provided with a slot with an isosceles trapezoidal cross-section.

[0019] A further technical solution also includes an anti-slip component installed on the door body, which is used to prevent the core-buffering component installed on the door body from slipping off.

[0020] Further technical solution: The anti-slip assembly includes an insertion rod A, to which an insertion rod B is fixedly connected. The insertion rod B slides with a nut that is detachably mounted on the end of a mounting slot A provided on the door body. An elastic part C is sleeved on the insertion rod B, whose two ends respectively press against the insertion rod A and the nut. The insertion rod B is limited to the nut by a pin. A zipper is installed on the insertion rod B, and the insertion rod A slides with the mounting slot A.

[0021] Further technical solution: The pushing assembly includes a hydraulic cylinder A, which is detachably mounted on the elevator body. A hinged head is mounted on the output shaft of the hydraulic cylinder A. A push plate is hinged on the hinged head and is hinged to the free end of a connecting plate fixedly connected to the door body. The hydraulic cylinder A is connected to the micro hydraulic station through an oil circuit assembly, and the push plate is rotatably connected to the elevator body through a rotating shaft B.

[0022] Further technical solutions also include: an oil circuit control component installed on the elevator body, which is used to position the drill string and control the oil circuit.

[0023] Further technical solution: The oil circuit control assembly includes a push rod A, a push rod B fixedly connected to the push rod A, and both push rods are slidably engaged with a mounting slot B provided on the elevator body, a spring positioning block is detachably mounted on the outer end of the mounting slot B, and an elastic member A is provided in the mounting slot B with two ends fixedly connected to the spring positioning block and the push rod B respectively, and further includes:

[0024] The valve body assembly is used to open and close the oil circuit assembly installed on the elevator body and connected to the micro hydraulic station.

[0025] Further technical solution: The valve body assembly includes a valve stem and a valve body, one end of the valve stem extends into the valve part of the oil circuit assembly and is fixedly connected to the valve body, the other end of the valve stem is located in a push groove opened on the push rod B, and the valve body is sequentially installed with a piston sleeve A and a piston sleeve B starting from the end close to the valve stem. The piston sleeve B slides with the valve part, and an oil port is provided on the valve part. The micro hydraulic station, the pushing assembly and the flip assembly are all connected to the corresponding oil ports through pipelines. An elastic part B is provided in the valve part, and the elastic part B is fixedly connected to the piston sleeve B and the valve part. The free end of the valve stem is a round head for easy sliding in the push groove.

[0026] Further technical solution: The specific working principle of the data processing module is:

[0027] The current oil viscosity information is compared with the standard oil viscosity information to obtain the oil viscosity index;

[0028] The temperature fluctuation index is obtained by performing a difference process between the current oil temperature and the average oil temperature during the acquisition period, and then performing a ratio process with the average oil temperature.

[0029] The obtained oil cleanliness information is compared with the maximum allowable oil cleanliness to obtain the oil cleanliness index;

[0030] The flow fluctuation index is obtained by performing ratio processing on the standard deviation and mean of the flow rate of the oil fluid flowing into the accumulator during the collection period;

[0031] The voltage fluctuation index is obtained by performing a ratio process on the voltage standard deviation and mean value of the micro hydraulic station during the acquisition period.

[0032] The current vibration information of the accumulator is compared with the maximum allowable vibration information to obtain the vibration index of the accumulator;

[0033] The operating frequency of the accumulator is ratioed to the maximum allowable operating frequency to obtain the accumulator operating frequency index.

[0034] Further technical solution: The specific working principle of the pressure stability analysis module is:

[0035] Import the oil viscosity reliability and vibration reliability into the constructed weight distribution model to obtain the weights of the viscosity index and vibration index in the constructed pressure stability analysis model;

[0036] Importing the obtained weight of the viscosity index in the pressure stability analysis model, the weight of the vibration index in the pressure stability analysis model, the viscosity index, and the vibration index into the constructed pressure stability analysis model, and outputting the pressure stability coefficient;

[0037] The weight distribution model is expressed as:

[0038]

[0039] in, represents the weight of viscosity index in the pressure stability analysis model, represents the weight of the vibration index in the pressure stability analysis model, Indicates viscosity reliability, Indicates vibration reliability;

[0040] The pressure stability analysis model is expressed as:

[0041]

[0042] in, represents the pressure stability coefficient, represents the viscosity index, represents the vibration index, represents the weight of viscosity index in the pressure stability analysis model, Represents the weight of the vibration index in the pressure stability analysis model.

[0043] Further technical solution: The working principle of the pressure adjustment module is:

[0044] The preset accumulator required pressure and pressure stability coefficient are imported into the constructed pressure adjustment model to output the accumulator target pressure;

[0045] Compare the target pressure with the preset pressure threshold. If the target pressure is within the preset pressure threshold, adjust the required pressure to the target pressure. If the target pressure is not within the preset pressure threshold, adjust the required pressure to the closest preset pressure threshold boundary value.

[0046] The pressure adjustment model is expressed as:

[0047]

[0048] in, Indicates the target pressure, Indicates the required pressure, represents the proportional gain coefficient, represents the pressure stability coefficient, represents the expected stability coefficient.

[0049] Further technical solution: The specific working principle of the viscosity reliability analysis module is:

[0050] A viscosity reliability analysis model is constructed based on the oil temperature fluctuation index and the accumulator operating frequency index;

[0051] The oil temperature fluctuation index and accumulator operating frequency index are imported into the constructed viscosity reliability analysis model to output the viscosity reliability;

[0052] Wherein, the viscosity reliability analysis model is expressed as:

[0053]

[0054] in, Indicates viscosity reliability, Indicates the oil temperature fluctuation index, Indicates the accumulator operating frequency index, 、 Represents the attenuation coefficient.

[0055] Further technical solution: The working principle of the vibration reliability analysis module is:

[0056] Construct a vibration reliability analysis model based on flow fluctuation index, voltage fluctuation index and oil cleanliness index;

[0057] Import the flow fluctuation index, voltage fluctuation index and oil cleanliness index into the vibration reliability analysis model to output the vibration reliability;

[0058] Wherein, the vibration reliability analysis model is expressed as:

[0059]

[0060] in, Indicates vibration reliability, Indicates the flow fluctuation index, Represents the voltage fluctuation index, Indicates the oil cleanliness index, 、 、 represents the weight coefficient of flow fluctuation index, voltage fluctuation index and oil cleanliness index and .

[0061] The present invention provides an intelligent wireless controlled elevator, which has the following advantages compared with the prior art:

[0062] 1. The present invention uses a micro hydraulic station to drive the pushing assembly and the flipping assembly to complete the opening and closing of the door body and the flipping of the elevator body, replacing the traditional large hydraulic station, eliminating complex pipes and valves, reducing the risk of leakage, and lowering the equipment manufacturing and maintenance costs;

[0063] 2. The isosceles trapezoidal slot design of the core bushing assembly enhances the drill string's positioning capability. The anti-drop assembly achieves double locking through the combination of an insert rod and an elastic member to prevent accidental dropout during operation. At the same time, the oil circuit control assembly can locate the drill string installation position.

[0064] 3. The accumulator pressure control system uses multi-sensor data fusion to analyze oil viscosity reliability and vibration reliability in real time, dynamically adjusting pressure weights to ensure accumulator pressure stability and avoid failure caused by over- or under-pressure. It also integrates a wireless communication module to support remote command transmission and status feedback, reducing on-site wiring requirements and improving operational flexibility and safety.

[0065] 4. Through oil cleanliness, temperature fluctuation and vibration monitoring, combined with compensation algorithms, it can effectively cope with harsh working conditions such as high temperature and pollution, and extend the life of the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 The figure is a schematic diagram of the three-dimensional structure of the intelligent radio-controlled elevator of the present invention.

[0067] Figure 2It is a structural schematic diagram of the driving component of the present invention.

[0068] Figure 3 It is a structural schematic diagram of the core-bushing assembly and the oil circuit control assembly of the present invention.

[0069] Figure 4 It is a partial structural diagram of the valve body assembly of the present invention.

[0070] Figure 5 It is a structural schematic diagram of the door body and the anti-slip assembly of the present invention.

[0071] Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure of part A in the middle.

[0072] Figure 7 It is a structural schematic diagram of the flip assembly of the present invention.

[0073] Figure 8 This is a structural block diagram of an accumulator pressure control system according to an embodiment of the present invention.

[0074] Figure numerals: 1. Elevator body; 2. Door body; 3. Bushing assembly; 301. Bushing; 302. Pin; 4. Oil control assembly; 401. Push rod A; 402. Push rod B; 403. Push groove; 404. Elastic part A; 405. Spring positioning block; 406. Valve body assembly; 4061. Valve stem; 4062. Valve body; 4063. Piston sleeve A; 4064. Piston sleeve B; 4065. Elastic part B; 407. Valve member; 4071. Oil port; 5. Micro hydraulic station; 6. Anti-slip assembly; 601. Insert rod A; 602. Insert rod B; 603. Elastic part C; 604. Nut; 6 05. Pin; 606. Zipper; 7. Pushing assembly; 701. Hydraulic cylinder A; 702. Push plate; 703. Hinge joint; 704. Connecting plate; 8. Hanging rod; 9. Flipping assembly; 901. Mounting box; 902. Hydraulic cylinder B; 903. Triangular push block; 904. Arc push block; 905. Connecting push block; 906. Step; 10. Accumulator pressure control system; 1001. Data acquisition module; 1002. Data processing module; 1003. Viscosity reliability analysis module; 1004. Vibration reliability analysis module; 1005. Pressure stability analysis module; 1006. Pressure adjustment module. DETAILED DESCRIPTION

[0075] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0076] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0077] like Figure 1 The three-dimensional structure diagram of the intelligent wireless controlled elevator shown in the figure includes an elevator body 1 and a door body 2. The two doors 2 are symmetrically mounted on the elevator body 1 via a rotation axis A (not shown in the figure). The elevator body 1 is equipped with a suspension rod 8.

[0078] There are two sets of bushing components 3, which are installed on the elevator body 1 and the door body 2 respectively;

[0079] The anti-drop assembly 6 is installed on the door body 2 and is used to prevent the core-bushing assembly 3 installed on the door body 2 from dropping off;

[0080] The oil circuit control assembly 4 is installed on the elevator body 1 and is used for positioning the drill string and controlling the oil circuit.

[0081] A pushing assembly 7, mounted on the elevator body 1, for pushing the two door bodies 2 to rotate around the rotation axis A;

[0082] The flip assembly 9 is installed on the boom 8 and is used to push the elevator body 1 to rotate around the connection with the boom 8;

[0083] The micro hydraulic station 5 is installed on the elevator body 1 and is used to provide power to the pushing assembly 7 and the flipping assembly. It includes a hydraulic station body, an accumulator and a wireless control device.

[0084] The accumulator pressure control system 10 is used to dynamically regulate the hydraulic oil pressure in the accumulator.

[0085] The following is a detailed description of the intelligent radio-controlled elevator.

[0086] like Figure 2 FIG. 1 is a schematic diagram of the structure of the pushing assembly 7 according to an embodiment of the present invention. The pushing assembly 7 includes a hydraulic cylinder A701, which is detachably mounted on the elevator body 1. A hinged joint 703 is mounted on the output shaft of the hydraulic cylinder A701. The hinged joint 703 is hinged with a push plate 702 hinged to the free end of a connecting plate 704 fixedly connected to the door body 2. The hydraulic cylinder A701 is connected to the micro hydraulic station 5 through an oil circuit assembly (not shown in the figure). The push plate 702 is connected to the micro hydraulic station 5 through a rotating shaft B. (Not marked in the figure) is rotatably installed on the elevator body 1. The purpose of this arrangement is to use the micro hydraulic station 5 to drive the hydraulic cylinder A701 to move, and then use the hydraulic cylinder A701 to push one end of the push plate 702, so that the other end of the push plate 702 swings around the rotation axis B, and then use the push plate 702 to push the connecting plate 704 to drive the door body 2 to rotate around the rotation axis A, thereby realizing the opening and closing processing between the two door bodies 2 and the elevator body 1, and then completing the technical effect of clamping, limiting and releasing the drill string.

[0087] like Figure 3 as well as Figure 5 As shown, Figure 3 This is a structural diagram of the core bushing assembly and the oil circuit control assembly of the present invention. Figure 5 This is a schematic diagram of the structure of the door body and anti-drop assembly of the present invention. The bushing assembly 3 includes a bushing 301 and a pin 302. Two sets of bushings 301 are rotatably mounted on the elevator body 1 and the door body 2 via the pin 302. The bushings 301 are provided with a groove (not shown) with an isosceles trapezoidal cross-section. The purpose of this arrangement is to use the bushing assembly 3 to clamp and limit the drill string.

[0088] like Figure 3 as well as Figure 4 As shown, Figure 3 This is a structural diagram of the core bushing assembly 3 and the oil circuit control assembly 4 of the present invention. Figure 4 This is a partial structural diagram of the valve body assembly of the present invention. The oil circuit control assembly 4 includes a push rod A401, which is fixedly connected to a push rod B402. Both push rod A401 and push rod B402 slide in a mounting slot B (not shown) provided on the elevator body 1. A spring positioning block 405 is detachably mounted on the outer end of the mounting slot B. An elastic member A404 is disposed within the mounting slot B, with its two ends fixedly connected to the spring positioning block 405 and push rod B402, respectively. The assembly also includes:

[0089] The valve body assembly 406 is used to open and close the oil circuit assembly installed on the elevator body 1 and connected to the micro hydraulic station 5;

[0090] The valve body assembly 406 includes a valve stem 4061 and a valve body 4062, one end of the valve stem 4061 extends into the valve member 407 of the oil circuit assembly and is fixedly connected to the valve body 4062, the other end of the valve stem 4061 is located in the push groove 403 provided on the push rod B402, and the valve body 4062 is sequentially installed with a piston sleeve A4063 and a piston sleeve B4064 starting from the end close to the valve stem 4061, the piston sleeve B4064 is slidably matched with the valve member 407, and an oil port 4071 is provided on the valve member 407, the micro hydraulic station 5, the pushing assembly 7 and the flip assembly 9 are all connected to the corresponding oil port 4071 through a pipeline, an elastic member B4065 is provided in the valve member 407, and the elastic member B4065 is fixedly connected to the piston sleeve B4064 and the valve member 407, and the free end of the valve stem 4061 is The rounded head facilitates sliding within the push groove. This design is intended to facilitate the following: when the drill string is engaged with the two sets of bushings, the drill string pushes the two bushings 301 to rotate about the pin 302. The bushings 301 then push the push rod A401, which in turn drives the push rod B402 to slide within the installation groove B (not shown) and squeeze the elastic member A404. The push rod B402 then pushes the valve stem 4061 relative to the valve element 407 through the push groove 403. The valve stem 4061 pushes the valve body 4062, which pushes the piston sleeve B4064 to squeeze the elastic member B4065 and slide along the inner cavity of the valve element 407, forcing the piston sleeve B4064 away from the oil port 4071 and the piston sleeve A4063 to be positioned at the oil port 4071. At this point, the oil circuit assembly is connected, and subsequent operations can be performed. If the oil circuit assembly is not connected, it indicates that the drill string is not in the center of the bushing assembly 3 and is not properly installed, and subsequent operations cannot be performed.

[0091] like Figure 5 as well as Figure 6 As shown, Figure 5 This is a schematic structural diagram of the door body 2 and the anti-slip assembly 6 of the present invention. Figure 6 For the present invention Figure 5The enlarged schematic diagram of the structure of part A in the middle shows that the anti-slip component 6 includes an insertion rod A601, and an insertion rod B602 is fixedly connected to the insertion rod A601. The insertion rod B602 slides with a nut 604 that is detachably mounted on the end of a mounting slot A (not shown in the figure) provided on the door body 2. An elastic member C603 is sleeved on the insertion rod B602, with two ends respectively pressing against the insertion rod A601 and the nut 604. The insertion rod B602 is limited to the nut 604 by a pin 605. A pull rod is installed on the insertion rod B602. The chain 606 and the insertion rod A601 are slidably engaged with the mounting groove A. The purpose of this arrangement is to use the insertion rod B602 to push the insertion rod A601 into the slot provided on the bushing 301, thereby preventing the bushing 301 from falling out. At the same time, relevant technicians can release the restraint between the insertion rod B602 and the nut 604 by releasing the pin 605 and causing the insertion rod A601 to slide along the mounting groove A by pulling the zipper 606, thereby releasing the restraint of the insertion rod A601 on the bushing 301.

[0092] like Figure 7 The figure is a schematic diagram of the structure of the flip assembly 9 of the present invention. The flip assembly 9 includes a mounting box 901, a hydraulic cylinder B902, a triangular push block 903 and a connecting push block 905. The mounting box 901 is detachably mounted on the boom 8. The top end of the triangular push block 903 is hinged to the output shaft of the hydraulic cylinder B902. One side end of the triangular push block 903 is rotatably connected to the mounting box 901 through a rotating shaft C (not shown in the figure). The other side end of the triangular push block 903 is hinged with an arc-shaped push block 904. The arc-shaped push block 904 is provided with a step 906 for facilitating the pushing of the triangular push block 903. The end of the arc-shaped push block 904 is hinged with a push block (not shown in the figure). The push block is connected to the rotating shaft C (not shown in the figure). The connecting push block 905 is hinged on the rotating shaft D, and the rotating shaft D is rotatably connected to the mounting box 901. The pushing block is located in the pushing groove provided on the connecting push block 905, and the end face of the pushing groove is an inclined surface. The hydraulic cylinder B902 is connected to the micro hydraulic station 5 through the oil circuit assembly (not shown in the figure). The purpose of this arrangement is to use the micro hydraulic station 5 to push the hydraulic cylinder B902 to drive the triangular push block 903 to swing around the central axis of the rotating shaft C. At this time, the triangular push block 903 pushes the arc push block 904 through the step 906 to drive the push block to press against the end face of the pushing groove, thereby pushing the connecting push block 905 to rotate around the central axis of the rotating shaft D, thereby achieving the technical effect of pushing the elevator body 1 to flip.

[0093] like Figure 8 , which is a structural diagram of an accumulator pressure control system 10 , an accumulator is provided with an accumulator pressure control system 10 for dynamically regulating the hydraulic oil pressure in the accumulator.

[0094] The accumulator is charged with pressure through the micro hydraulic station 5 (this is achieved through the "charge start" command. When the collected pressure value reaches the set threshold, the pressure charging stops. When the pressure in the oil cylinder is lower than the set lower pressure limit, the oil pump starts to squeeze the hydraulic oil into the accumulator, so that the pressure in the accumulator returns to the set pressure threshold). When the pressure value reaches the set value, the relevant control actions of the elevator can be executed:

[0095] Door opening: After receiving the door opening command, the pressure in the accumulator is released into the door opening oil circuit by controlling the solenoid valve. When the door bolt sensor signal disappears, it is considered that the door opening is completed.

[0096] Closing the door: When the closing command is received and the signal that the steel pipe is in place is detected, the pressure of the accumulator is released into the oil circuit of the closing door by controlling the solenoid valve, thereby completing the closing action. When the door bolt sensor signal is detected, the closing is considered to be completed.

[0097] Flip: After receiving the flip command, the solenoid valve is controlled to release the pressure of the accumulator into the flip oil circuit, thereby completing the flip action.

[0098] Reset: After receiving the reset command, the solenoid valve is controlled to allow the pressure in the reversing oil circuit to flow back into the oil cylinder, completing the reset action of the elevator.

[0099] like Figure 8 , which is a structural diagram of an accumulator pressure control system 10 , the accumulator pressure control system 10 includes: a data acquisition module 1001 , a data processing module 1002 , a viscosity reliability analysis module 1003 , a vibration reliability analysis module 1004 , a pressure stability analysis module 1005 and a pressure adjustment module 1006 .

[0100] The accumulator pressure control system 10 will be described in detail below.

[0101] Data acquisition module 1001, used to obtain information on the viscosity of the oil in the accumulator, information on oil temperature fluctuations, information on oil cleanliness, information on flow fluctuations of the oil filling the accumulator, information on voltage fluctuations of the micro hydraulic station 5, information on accumulator vibration, and information on the operating frequency of the accumulator;

[0102] The data processing module 1002 is used to process the information acquired by the data acquisition module 1001 to obtain the oil viscosity index, oil temperature fluctuation index, oil cleanliness index, flow fluctuation index, voltage fluctuation index, vibration index and accumulator operating frequency index;

[0103] The viscosity reliability analysis module 1003 obtains the oil viscosity reliability based on the oil temperature fluctuation index and the accumulator operating frequency index;

[0104] The vibration reliability analysis module 1004 obtains vibration reliability based on the flow fluctuation index, voltage fluctuation index, and oil cleanliness index;

[0105] The pressure stability analysis module 1005 constructs a pressure stability analysis model based on the oil viscosity index and the vibration index and dynamically assigns weights of the oil viscosity index and the vibration index in the pressure stability analysis model based on the oil viscosity reliability and the vibration reliability, thereby obtaining a dynamic pressure stability coefficient.

[0106] The pressure adjustment module 1006 constructs a pressure adjustment model according to the preset accumulator required pressure and the pressure stability coefficient, outputs the accumulator target pressure, and adjusts the accumulator pressure to the target pressure.

[0107] Compared to existing technologies, traditional elevators utilize fixed hydraulic stations and unidirectional pressure control, making them incapable of handling dynamic changes in oil conditions. This solution eliminates reliance on external pipelines through the integration of a micro-hydraulic station and multi-parameter fusion monitoring. Reliability analysis and dynamic weighting address the coupled interference of multiple factors, such as temperature and vibration. Closed-loop feedback regulation ensures accumulator pressure stability under complex operating conditions. For example, when a sudden increase in oil temperature causes a decrease in viscosity, the system automatically increases the weight of vibration parameters to prioritize suppressing pressure fluctuations caused by vibration.

[0108] Through the above technical solution, this application realizes the miniaturization integration of the hydraulic power unit, reduces the equipment complexity and maintenance cost; establishes a multi-dimensional parameter perception and dynamic control mechanism to effectively suppress the impact of oil state changes and external interference on the accumulator pressure; improves the system response speed and stability through closed-loop pressure control, and ensures the door opening and closing accuracy and drill string clamping reliability.

[0109] The specific working principle of the data processing module 1002 is as follows:

[0110] The current oil viscosity information is compared with the standard oil viscosity information to obtain the oil viscosity index;

[0111] The temperature fluctuation index is obtained by performing a difference process between the current oil temperature and the average oil temperature during the acquisition period, and then performing a ratio process with the average oil temperature.

[0112] The obtained oil cleanliness information is compared with the maximum allowable oil cleanliness to obtain the oil cleanliness index;

[0113] The flow fluctuation index is obtained by performing ratio processing on the standard deviation and mean of the flow rate of the oil fluid flowing into the accumulator during the collection period;

[0114] The voltage standard deviation of the micro hydraulic station 5 within the acquisition period is compared with the mean value to obtain the voltage fluctuation index;

[0115] The current vibration information of the accumulator is compared with the maximum allowable vibration information to obtain the vibration index of the accumulator;

[0116] The operating frequency of the accumulator is ratioed to the maximum allowable operating frequency to obtain the accumulator operating frequency index.

[0117] Specifically, the standardization process eliminates incomparability between different physical quantities by establishing a unified dimensional system for multidimensional parameters. The oil viscosity index eliminates dimensional differences, allowing viscosity data to be directly used in model calculations. The temperature fluctuation index uses relative fluctuations to enhance the ability to identify sudden temperature changes. The cleanliness index uses threshold normalization to convert pollutant concentrations into quantifiable and comparable pollution levels. The flow fluctuation index uses the coefficient of variation to highlight the impact of abnormal flow fluctuations on the system. The voltage fluctuation index accurately reflects the interference intensity of power supply quality on hydraulic components. The vibration index uses normalization to achieve equivalent evaluation of vibration severity under different operating conditions. The operating frequency index uses proportional calculation to dynamically reflect the system load status. These indices collectively constitute a multidimensional evaluation matrix for hydraulic oil status, providing standardized input for the subsequent weight allocation model.

[0118] Compared with existing technologies, traditional methods only monitor a single parameter or use fixed thresholds, making it impossible to perform dynamic analysis under the influence of multiple factors. This solution solves the problem of heterogeneous data fusion by establishing a standardized index system for multidimensional parameters. Dynamic calculation methods such as coefficient of variation and relative difference are used to enhance the ability to capture transient operating conditions. Normalization allows for equivalent comparison of parameters of different dimensions, laying the foundation for the construction of a dynamic weight model.

[0119] Through the above technical solution, this application achieves a multi-dimensional dynamic assessment of hydraulic oil status, resolving the monitoring blind spots caused by the dispersed parameters and inconsistent dimensions of traditional elevators. The standardized index system accurately quantifies the impact of various factors on pressure stability, eliminating the risk of misjudgment in single-parameter monitoring. This provides precise data support for subsequent pressure regulation and effectively prevents pressure instability in the accumulator caused by abnormal oil status.

[0120] The specific working principle of the viscosity reliability analysis module 1003 is:

[0121] A viscosity reliability analysis model is constructed based on the oil temperature fluctuation index and the accumulator operating frequency index;

[0122] The oil temperature fluctuation index and accumulator operating frequency index are imported into the constructed viscosity reliability analysis model to output the viscosity reliability;

[0123] Comparing the viscosity reliability with a preset viscosity reliability threshold, and if the viscosity reliability threshold is exceeded, adjusting the oil temperature until the viscosity reliability is within the viscosity reliability threshold;

[0124] Wherein, the viscosity reliability analysis model is expressed as:

[0125]

[0126] in, Indicates viscosity reliability, Indicates the oil temperature fluctuation index, Indicates the accumulator operating frequency index, 、 Represents the attenuation coefficient (the intensity of the effect of temperature and frequency on the stability of oil viscosity).

[0127] Specifically, this module analyzes the impact of oil temperature fluctuations and accumulator operating frequency on viscosity reliability through nonlinear coupling. The oil temperature fluctuation index reflects the magnitude of temperature changes, while the operating frequency index reflects the accumulator's operating intensity. The two are superimposed using an exponential decay model.

[0128] Compared to existing technologies, traditional methods typically use linear weighting to assess the impact of a single parameter on viscosity, which fails to accurately reflect the synergistic effects of temperature and frequency, as well as their nonlinear degradation characteristics. For example, existing technologies calculate the combined effects of temperature and frequency using arithmetic averaging, resulting in unrealistic evaluation results under high-temperature, low-frequency conditions. This solution overcomes the limitations of linear models by employing an exponential decay model and product term design, ensuring that reliability assessments more closely align with the actual degradation patterns of hydraulic fluids.

[0129] Through the above technical solution, this application can dynamically quantify the coupled effects of oil temperature fluctuations and accumulator operating frequency on viscosity reliability, resolving the misjudgment problem caused by traditional assessment methods that ignore the interaction between parameters. For example, during drilling operations, when the accumulator operates at high frequency and the oil temperature fluctuates violently, the model can accurately calculate the decrease in viscosity reliability, providing precise input for subsequent pressure control and avoiding accumulator pressure instability caused by viscosity assessment deviations.

[0130] The working principle of the vibration reliability analysis module 1004 is as follows:

[0131] Construct a vibration reliability analysis model based on flow fluctuation index, voltage fluctuation index and oil cleanliness index;

[0132] Import the flow fluctuation index, voltage fluctuation index and oil cleanliness index into the vibration reliability analysis model to output the vibration reliability;

[0133] Wherein, the vibration reliability analysis model is expressed as:

[0134]

[0135] in, Indicates vibration reliability, Indicates the flow fluctuation index, Represents the voltage fluctuation index, Indicates the oil cleanliness index, 、 、 represents the weight coefficient of flow fluctuation index, voltage fluctuation index and oil cleanliness index and .

[0136] Specifically, the vibration reliability analysis module 1004 constructs a multi-factor coupled vibration reliability model, using the flow fluctuation index, voltage fluctuation index, and cleanliness index as input variables. During the model calculation process, weighting coefficients adjust the contribution of each parameter based on actual operating conditions. For example, when oil cleanliness deteriorates, the system can increase the weight of the oil cleanliness index to enhance the impact of contamination on vibration reliability. This model integrates these three independent interference variables into a unified vibration reliability index through superposition, providing a quantitative basis for subsequent pressure stability analysis.

[0137] Compared with existing technologies, traditional hydraulic elevators only use a single threshold to determine vibration status, fail to consider the coupling effects of flow fluctuations, voltage fluctuations, and oil cleanliness, and lack a dynamic weighting mechanism. This solution establishes a multi-parameter joint analysis model to more comprehensively assess the combined impact of vibration interference sources. It also utilizes adaptive weight coefficients to dynamically optimize the contribution of each factor, resolving the problem of misjudgment or missed judgments caused by fixed weights in existing technologies.

[0138] Through the above technical solution, this application achieves multi-dimensional quantitative analysis of accumulator vibration interference factors, effectively identifying the combined effects of flow fluctuations, voltage fluctuations, and oil contamination on system vibration. This significantly improves the dynamic stability of accumulator pressure control and avoids pressure instability caused by sudden changes in a single factor.

[0139] The specific working principle of the pressure stability analysis module 1005 is as follows:

[0140] Import the oil viscosity reliability and vibration reliability into the constructed weight distribution model to obtain the weights of the viscosity index and vibration index in the constructed pressure stability analysis model;

[0141] Importing the obtained weight of the viscosity index in the pressure stability analysis model, the weight of the vibration index in the pressure stability analysis model, the viscosity index, and the vibration index into the constructed pressure stability analysis model, and outputting the pressure stability coefficient;

[0142] The weight distribution model is expressed as:

[0143]

[0144] in, represents the weight of viscosity index in the pressure stability analysis model, represents the weight of the vibration index in the pressure stability analysis model, Indicates viscosity reliability, Indicates vibration reliability;

[0145] The pressure stability analysis model is expressed as:

[0146]

[0147] in, represents the pressure stability coefficient, represents the viscosity index, represents the vibration index, represents the weight of viscosity index in the pressure stability analysis model, Represents the weight of the vibration index in the pressure stability analysis model.

[0148] Specifically, during accumulator operation, the oil viscosity reliability and vibration reliability are input into a real-time weighting model to determine their respective weightings in the pressure stability assessment. For example, when drastic fluctuations in oil temperature cause viscosity reliability to decrease, the weighting of the viscosity index is automatically reduced, while the weighting of the vibration index is correspondingly increased. In the pressure stability analysis model, dynamic weights are weighted together with the real-time viscosity and vibration indices to generate a pressure stability coefficient. This coefficient quantifies the combined impact of oil viscosity fluctuations and vibration interference on the current accumulator pressure, providing a basis for subsequent pressure adjustments.

[0149] Compared with existing technologies, traditional accumulator pressure control methods use fixed weight ratios to assess pressure stability, which cannot adapt to dynamic changes in oil viscosity and vibration interference. This solution uses a weight distribution model to adjust parameter weights in real time, allowing the pressure stability assessment to prioritize the factors with the greatest impact at the moment. For example, if oil cleanliness deteriorates, causing a sudden drop in vibration reliability, the vibration index weight is automatically increased to avoid overall pressure instability caused by a single parameter anomaly.

[0150] Through the above technical solution, this application solves the problem of accumulator pressure instability caused by oil viscosity fluctuations and vibration interference. Through the dynamic weight distribution mechanism, the current dominant influencing factors are prioritized to achieve accurate quantitative evaluation of pressure stability, providing a reliable basis for accumulator pressure adjustment, and ensuring that the hydraulic system maintains stable working pressure under different working conditions.

[0151] The working principle of the pressure adjustment module 1006 is:

[0152] The preset accumulator required pressure and pressure stability coefficient are imported into the constructed pressure adjustment model to output the accumulator target pressure;

[0153] Compare the target pressure with the preset pressure threshold. If the target pressure is within the preset pressure threshold, adjust the required pressure to the target pressure. If the target pressure is not within the preset pressure threshold, adjust the required pressure to the closest preset pressure threshold boundary value.

[0154] The pressure adjustment model is expressed as:

[0155]

[0156] in, Indicates the target pressure, Indicates the required pressure, represents the proportional gain coefficient, represents the pressure stability coefficient, Indicates the expected stability coefficient (usually set to 1, the specific value can be set by the user).

[0157] Specifically, the pressure adjustment model links the pressure stability coefficient to the desired pressure using a proportional gain factor. When the stability coefficient deviates from the desired value, the target pressure is automatically adjusted proportionally to compensate for the effects of instability. Once the target pressure is generated, a threshold comparison is performed to determine whether it is within a preset safety range. If it is within the range, pressure adjustment is performed directly; if it is outside the range, it is automatically truncated to the nearest boundary value. This process achieves dynamic pressure regulation through closed-loop control, which not only adjusts the target pressure in real time based on oil viscosity, temperature fluctuations, and vibration interference, but also prevents over-adjustment and pressure loss through threshold constraints.

[0158] Compared with existing technologies, traditional accumulator pressure control relies solely on static threshold protection or open-loop regulation, failing to dynamically adjust target pressure based on oil conditions and operating environment. Existing methods are prone to pressure instability or response lag due to fixed parameter settings when encountering changes in oil viscosity or external vibrations. This solution, however, incorporates multiple factors, such as oil viscosity, temperature, and vibration, into the adjustment model through a pressure stability coefficient and a dynamic weight distribution mechanism. Combined with threshold boundary protection, this creates an adaptive closed-loop control system, effectively improving pressure regulation accuracy and safety.

[0159] Through the above technical solution, this application solves the problem of accumulator pressure instability caused by oil viscosity changes, temperature fluctuations, and vibration interference, and realizes adaptive pressure regulation under complex operating conditions. By dynamically adjusting the target pressure and threshold boundary protection, it not only avoids system oscillation caused by pressure overshoot, but also ensures that the pressure remains within the safe operating range, thereby improving the reliability and control accuracy of the elevator hydraulic system.

[0160] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0161] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent wireless controlled elevator, comprising an elevator body, two doors symmetrically mounted on the elevator body via a rotating shaft A, and a suspension rod mounted on the elevator body, characterized in that: Also includes: A pushing assembly, mounted on the elevator body, for pushing the two door bodies to rotate around the rotation axis A; The flip assembly is installed on the boom and is used to push the elevator body to rotate around the connection with the boom; The micro hydraulic station is installed on the elevator body and includes a hydraulic station body, an accumulator installed on the hydraulic station body, and a wireless control device; The accumulator is provided with an accumulator pressure control system for dynamically regulating the hydraulic oil pressure in the accumulator, including: The viscosity reliability analysis module obtains the oil viscosity reliability based on the oil temperature fluctuation index in the accumulator and the accumulator operating frequency index; The vibration reliability analysis module obtains vibration reliability based on the flow fluctuation index of the accumulator, the oil cleanliness index, and the voltage fluctuation index of the micro hydraulic station; The pressure stability analysis module constructs a pressure stability analysis model based on the vibration index of the accumulator and the viscosity index of the oil in it, and dynamically allocates the weights of the oil viscosity reliability and vibration reliability in the pressure stability analysis model to obtain the dynamic pressure stability coefficient; The pressure adjustment module obtains the accumulator target pressure according to the preset accumulator required pressure and the pressure stability coefficient and adjusts the accumulator pressure to the target pressure.

2. The intelligent wireless controlled elevator according to claim 1, characterized in that: The accumulator pressure control system further comprises: A data acquisition module is used to obtain information on the viscosity of the oil in the accumulator, information on oil temperature fluctuations, information on oil cleanliness, information on flow fluctuations of the oil filling the accumulator, information on voltage fluctuations of the micro hydraulic station, information on accumulator vibrations, and information on the operating frequency of the accumulator; The data processing module is used to process the information obtained by the data acquisition module to obtain the oil viscosity index, oil temperature fluctuation index, oil cleanliness index, flow fluctuation index, voltage fluctuation index, vibration index and accumulator operating frequency index.

3. The intelligent wireless controlled elevator according to claim 1, characterized in that: The flip assembly includes a mounting box, a hydraulic cylinder B, a triangular push block and a connecting push block. The mounting box is detachably mounted on the boom. The top end of the triangular push block is hinged to the output shaft of the hydraulic cylinder B. One side end of the triangular push block is rotatably connected to the mounting box via a rotating shaft C. The other side end of the triangular push block is hinged with an arc-shaped push block. A step is provided on the arc-shaped push block for facilitating the pushing of the triangular push block. The end of the arc-shaped push block is hinged with a push block. The push block is hinged to the connecting push block via a rotating shaft D. The rotating shaft D is rotatably connected to the mounting box. The push block is located in a push groove provided on the connecting push block and the end face of the push groove is an inclined surface. The hydraulic cylinder B is connected to the micro hydraulic station via an oil circuit assembly.

4. The intelligent wireless controlled elevator according to claim 1, characterized in that: It also includes a core bushing assembly, which is provided with two groups and is correspondingly installed on the elevator body and the door body. The core bushing assembly includes a core bushing and a pin shaft. The two groups of core bushings are correspondingly rotatably installed on the elevator body and the door body through the pin shaft. The core bushing is provided with a slot with an isosceles trapezoidal cross-section.

5. The intelligent wireless controlled elevator according to claim 4, characterized in that: It also includes an anti-slip component installed on the door body, which is used to prevent the core-buffering component installed on the door body from slipping off.

6. The intelligent wireless controlled elevator according to claim 5, characterized in that: The anti-slip assembly includes an insertion rod A, to which an insertion rod B is fixedly connected. The insertion rod B slides with a nut that is detachably mounted on the end of a mounting groove A provided on the door body. An elastic member C is sleeved on the insertion rod B, with its two ends respectively pressing against the insertion rod A and the nut. The insertion rod B is restricted on the nut by a pin. A zipper is installed on the insertion rod B, and the insertion rod A slides with the mounting groove A.

7. The intelligent wireless controlled elevator according to claim 1, characterized in that: The pushing assembly includes a hydraulic cylinder A, which is detachably mounted on the elevator body. A hinged head is mounted on the output shaft of the hydraulic cylinder A. A push plate is hinged on the hinged head and is hinged to the free end of a connecting plate fixedly connected to the door body. The hydraulic cylinder A is connected to the micro hydraulic station through an oil circuit assembly, and the push plate is rotatably mounted on the elevator body through a rotating shaft B.

8. The intelligent wireless controlled elevator according to claim 1, characterized in that: Also includes: The oil circuit control assembly is installed on the elevator body and is used to detect the positioning of the drill string and control the oil circuit.

9. The intelligent wireless controlled elevator according to claim 8, characterized in that: The oil circuit control assembly includes a push rod A, a push rod B fixedly connected to the push rod A, and both push rods are slidably engaged with a mounting slot B provided on the elevator body. A spring positioning block is detachably mounted on the outer end of the mounting slot B. An elastic member A is disposed in the mounting slot B at both ends thereof, which are fixedly connected to the spring positioning block and the push rod B, respectively. The assembly further includes: The valve body assembly is used to open and close the oil circuit assembly installed on the elevator body and connected to the micro hydraulic station.

10. The intelligent wireless controlled elevator according to claim 9, characterized in that: The valve body assembly includes a valve stem and a valve body, one end of the valve stem extends into the valve part of the oil circuit assembly and is fixedly connected to the valve body, the other end of the valve stem is located in a push groove provided on the push rod B, and a piston sleeve A and a piston sleeve B are sequentially installed on the valve body starting from the end close to the valve stem, the piston sleeve B slides in cooperation with the valve part, an oil port is provided on the valve part, the micro hydraulic station, the pushing assembly and the flip assembly are all connected to the corresponding oil ports through pipelines, an elastic part B is provided in the valve part, the elastic part B is fixedly connected to the piston sleeve B and the valve part, and the free end of the valve stem is a round head for easy sliding in the push groove.

11. The intelligent wireless controlled elevator according to claim 2, characterized in that: The working principle of the data processing module is: The current oil viscosity information is compared with the standard oil viscosity information to obtain the oil viscosity index; The temperature fluctuation index is obtained by performing a difference process between the current oil temperature and the average oil temperature during the acquisition period, and then performing a ratio process with the average oil temperature. The obtained oil cleanliness information is compared with the maximum allowable oil cleanliness to obtain the oil cleanliness index; The flow fluctuation index is obtained by performing ratio processing on the standard deviation of the flow rate of the oil fluid flowing into the accumulator during the collection period and the mean value; The voltage fluctuation index is obtained by performing a ratio process on the voltage standard deviation and mean value of the micro hydraulic station during the acquisition period. The current vibration information of the accumulator is compared with the maximum allowable vibration information to obtain the vibration index of the accumulator; The operating frequency of the accumulator is ratioed to the maximum allowable operating frequency to obtain the accumulator operating frequency index.

12. The intelligent wireless controlled elevator according to claim 1, characterized in that: The working principle of the pressure adjustment module is: The preset accumulator required pressure and pressure stability coefficient are imported into the constructed pressure adjustment model to output the accumulator target pressure; Compare the target pressure with the preset pressure threshold. If the target pressure is within the preset pressure threshold, adjust the required pressure to the target pressure. If the target pressure is not within the preset pressure threshold, adjust the required pressure to the closest preset pressure threshold boundary value. The pressure adjustment model is expressed as: in, Indicates the target pressure, Indicates the required pressure, represents the proportional gain coefficient, represents the pressure stability coefficient, represents the expected stability coefficient.

13. The intelligent wireless controlled elevator according to claim 1, characterized in that: The working principle of the pressure stability analysis module is: Import the oil viscosity reliability and vibration reliability into the constructed weight distribution model to obtain the weights of the viscosity index and vibration index in the constructed pressure stability analysis model; Importing the obtained weight of the viscosity index in the pressure stability analysis model, the weight of the vibration index in the pressure stability analysis model, the viscosity index, and the vibration index into the constructed pressure stability analysis model, and outputting the pressure stability coefficient; The weight distribution model is expressed as: in, represents the weight of viscosity index in the pressure stability analysis model, represents the weight of the vibration index in the pressure stability analysis model, Indicates viscosity reliability, Indicates vibration reliability; The pressure stability analysis model is expressed as: in, represents the pressure stability coefficient, represents the viscosity index, represents the vibration index, represents the weight of viscosity index in the pressure stability analysis model, Represents the weight of the vibration index in the pressure stability analysis model.

14. The intelligent wireless controlled elevator according to claim 1, characterized in that: The working principle of the viscosity reliability analysis module is: A viscosity reliability analysis model is constructed based on the oil temperature fluctuation index and the accumulator operating frequency index; The oil temperature fluctuation index and accumulator operating frequency index are imported into the constructed viscosity reliability analysis model to output the viscosity reliability; Wherein, the viscosity reliability analysis model is expressed as: in, Indicates viscosity reliability, Indicates the oil temperature fluctuation index, Indicates the accumulator operating frequency index, 、 Represents the attenuation coefficient.

15. The intelligent wireless controlled elevator according to claim 1, characterized in that: The working principle of the vibration reliability analysis module is: Construct a vibration reliability analysis model based on flow fluctuation index, voltage fluctuation index and oil cleanliness index; Import the flow fluctuation index, voltage fluctuation index and oil cleanliness index into the vibration reliability analysis model to output the vibration reliability; Wherein, the vibration reliability analysis model is expressed as: in, Indicates vibration reliability, Indicates the flow fluctuation index, Represents the voltage fluctuation index, Indicates the oil cleanliness index, 、 、 represents the weight coefficient of flow fluctuation index, voltage fluctuation index and oil cleanliness index and .

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