Suspended all-condition electronic slurry specific gravity detection device and detection method thereof

Abstract

The invention relates to the technical field of slurry specific gravity detection devices, and discloses a suspension type full-working-condition electronic slurry specific gravity detection device and a detection method thereof.The detection device comprises a barrel, a detection rod and a signal line, pressure sensors are arranged at openings in the two ends of the interior of the barrel, and a mounting plate is arranged at the middle end of the interior of the barrel; protective covers are arranged on the end faces of the two ends of the barrel, and a copper wire lifting rope is arranged above the protective cover located at the upper end of the barrel; the detection method comprises the step of directly putting the cylinder body into a mud pit for detection. According to the suspension type full-working-condition electronic mud specific gravity detection device, through the arrangement of the measuring rod and the copper wire lifting rope, the device body can be overhung out and slowly put into mud liquid, and operation close to the side of a mud pool is not needed; according to the detection method of the suspension type all-condition electronic mud specific gravity detection device, the cylinder is placed in a mud pit, the upper pressure sensor and the lower pressure sensor measure pressure, the specific gravity of mud is calculated, operation is easy, and time and labor are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of mud specific gravity detection devices, and particularly to a suspended full-condition electronic mud specific gravity detection device and a detection method thereof. Background Art

[0002] In foundation engineering construction, the mud specific gravity is an important parameter index. By detecting the mud specific gravity, the quality and performance of the mud can be evaluated, which can provide an important reference basis for engineering construction, thereby ensuring the stability and safety of the project.

[0003] For the existing measurement means of mud specific gravity, a balance-type mud specific gravity meter is mostly used. This device needs to first operate the sampling device to obtain a mud sample, and then detect the mud sample. The detection operation is cumbersome and time-consuming; in addition, various existing mud specific gravity measurement methods cannot directly measure the deep mud specific gravity, and it is necessary to carry the mud specific gravity detection device close to the edge of the mud pit for operation, but the edge of the mud pit is usually very muddy, so it is difficult to carry out. Therefore, it is necessary to provide a suspended full-condition electronic mud specific gravity detection device and a detection method thereof to solve the above problems. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a suspended full-condition electronic mud specific gravity detection device and a detection method thereof, which solve the problems mentioned in the above background.

[0005] The present invention provides the following technical solutions: A suspended full-condition electronic mud specific gravity detection device includes a cylinder body, a measuring rod and a signal wire. Pressure sensors are arranged at both open ends inside the cylinder body. An installation plate is arranged in the middle inside the cylinder body. A battery is arranged on one side of the upper surface of the installation plate, and a circuit board is arranged on the upper surface of the installation plate and on the side of the battery. The battery is electrically connected to the circuit board, and both pressure sensors are electrically connected to the circuit board. Protective covers are arranged on both end faces of the cylinder body, and a copper wire suspension rope is arranged above the protective cover at the upper end of the cylinder body.

[0006] Preferably, a wire winding and releasing device is arranged on the lower surface of the measuring rod. A guiding ring is arranged on the lower surface of the measuring rod and on the side of the wire winding and releasing device. A wiring seat is arranged on the lower surface of the measuring rod and between the guiding ring and the wire winding and releasing device. The upper end of the copper wire suspension rope passes through the guiding ring and the wiring seat and is wound on the wire winding and releasing device.

[0007] Preferably, a socket is opened at the upper end of the outer surface of the cylinder body. A circular spirit level is inserted into the cylinder body through the socket at the upper end of the outer surface of the cylinder body. A balance frame is sleeved on the lower end of the outer surface of the cylinder body. The inside of the balance frame is divided into several slots by a partition, and the slots can be used for inserting balance blocks.

[0008] Preferably, the two protective covers are each provided with a lifting ring at one end away from the cylinder, the upper end of the protective cover located at the upper end of the cylinder is connected to a buoyancy block via a lifting ring, the lower end of the copper wire lifting rope is connected to the buoyancy block, and the lower end of the protective cover located at the lower end of the cylinder is connected to a counterweight block via a lifting ring, and the counterweight block and the buoyancy block are both removable.

[0009] Preferably, a data cable interface is provided on the upper end of the outer surface of the cylinder away from the socket, a charging interface is provided on the outer surface of the cylinder and below the data cable interface, and a waterproof structure is provided on the outside of the data cable interface and the charging interface.

[0010] Preferably, the waterproof structure includes a protective frame, a rubber plug and a fastening screw, the front ends of the data cable interface and the charging interface pass through the bottom wall of the protective frame and extend into the interior of the protective frame, and end covers are provided at the front openings of the data cable interface and the charging interface.

[0011] Preferably, the rubber plug is inserted into the protective frame, the upper end of the rubber plug is rotatably connected to the protective frame through a limiting shaft, the fastening screw is arranged at the lower end of the rubber plug, and a threaded hole cooperating with the fastening screw is opened at the lower end of the bottom surface of the protective frame.

[0012] Preferably, a plug interface is provided on the outer surface of the cylinder and above the waterproof structure, a Bluetooth gain antenna is provided on the upper end of the surface of the cylinder away from the plug interface through the plug interface, a wireless communication module is provided on the circuit board, the Bluetooth gain antenna is electrically connected to the circuit board through the wireless communication module, the Bluetooth gain antenna is detachable, and the circuit board is connected to the mobile phone signal through the wireless communication module.

[0013] The detection method based on the above-mentioned suspended full-operating electronic mud specific gravity detection device includes the following steps:

[0014] S1. Calibration of verticality of the device;

[0015] S2. Surface mud specific gravity detection: Based on the actual estimated mud density, choose to add a buoyancy block to the upper end of the cylinder, or hang a counterweight block at the lower end, so that the device can be suspended in the mud and the pressure sensor above can be completely submerged in the mud;

[0016] S3, approach the mud pool to be measured, suspend the device through the measuring rod and copper wire rope, and slowly put it into the mud liquid;

[0017] S4. The upper and lower pressure sensors in the mobile phone APP command device start measuring the pressure, and the measured pressure value is transmitted to the mobile phone APP via Bluetooth, and then the specific gravity of the mud is calculated according to the set calculation formula, where:

[0018] Calculation formula:

[0019] The height difference between the pressure measurement surfaces of the upper and lower pressure sensors is Δh, the area of the pressure measurement surface of the sensor is S, and the measured pressures are F1 and F2;

[0020] Then the pressures P1 and P2 measured by the upper and lower pressure sensors are P1 = F1 / S and P2 = F2 / S,

[0021] The specific weight of the mud γ = (P2 - P1) / Δh, and the specific gravity is γ / γ 水 ;

[0022] For the calculation of the depth Hi:

[0023] The winch lowers the cylinder body into the mud liquid surface at a normal and stable speed. The program is set to perform a pressure measurement simultaneously by the two pressure sensors at intervals of a short time Δt (such as setting Δt = 1 s). When measuring, the depth of the center position of the cylinder body is hi (i = 1, 2, 3... n), and the measured results are converted into pressure values P1i and P2i. Then the mud pressure Pi at this place is Pi = (P1i + P2i) / 2, and the specific gravity γi = (P2i - P1i) / Δh;

[0024] Since the interval time Δt of the pressure sensor measurement is small, within this period of time, the height difference of the cylinder body lowering is relatively small, and the relative change of the mud specific gravity can be ignored. That is, it is considered that the mud specific gravity within the height range from h(i - 1) to hi is γi. Then the pressure pi generated by the mud within the height range from h(i - 1) to hi is pi = γi×(hi - h(i - 1)) = Pi - P(i - 1);

[0025] That is, hi = (Pi - P(i - 1)) / γi + h(i - 1). Iterating this formula gives

[0026] hi = (P1 - P0) / γ1 + (P2 - P1) / γ2 + (P3 - P2) / γ3 + … + (Pi - P(i - 1)) / γi, where the pressure P0 at the mud liquid surface is 0;

[0027] When programming, according to the actual situation, set the measurement interval time Δt of the pressure sensor, and a hi - γi curve graph that meets the requirements can be obtained;

[0028] S5. Detection of the specific gravity of deep mud: According to the actual situation of roughly estimating the mud density, select whether to hang a counterweight at the lower end of the cylinder body so that the device can sink smoothly into the mud; repeat steps S1 - S4.

[0029] Preferably, in step S5, before calibrating the verticality of the device, it is necessary to remove the Bluetooth gain antenna from the device and connect it to the wiring seat on the measuring rod, plug the lower end of the antenna signal line into the jack, and connect the upper end of the antenna signal line to the copper wire suspension rope;

[0030] To improve the accuracy of specific gravity calculation, including:

[0031] Step 1: According to the set initial filtering duration t, filter the measured data within the range of each measured initial duration t.

[0032] Step 2: For the remaining paired data, calculate the specific gravity γi; γi = (P2i - P1i) / (ρwater·g·h), where P1i and P2i are the pressures measured by the upper and lower sensors respectively, g is the acceleration due to gravity, h is the central height of the two pressure sensors, and ρwater is the density of pure water.

[0033] Step 3: Filter the γi values that are not within the set effective numerical range R.

[0034] Step 4: Take the arithmetic mean of the remaining γi values to obtain γ'.

[0035] Step 5: Calculate Di = |γi - γ'| / γ'.

[0036] Step 6: Filter the γi values corresponding to Di greater than the set effective deviation D.

[0037] Step 7: Repeat Steps 4 to 6 for the set number of iteration times N to obtain the final result γ".

[0038] Step 8: Perform error correction on γ" in Step 7 to obtain γ = γ"·X + Δ; where X represents adjustment by a multiple and Δ represents adjustment by a difference.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. For the suspended full-condition electronic mud specific gravity detection device, by setting a circular spirit level bubble, inserting the circular spirit level bubble with a plug on the cylinder body to be integrated, suspending the device in clean water, observing the position of the bubble, and adjusting the balance weights on the outer shell to make the bubble return to the middle position for verticality calibration, ensuring the accuracy of later detection.

[0041] 2. For the suspended full-condition electronic mud specific gravity detection device, by setting a measuring rod and a copper wire suspension rope, the device body can be cantilevered out and slowly placed into the mud liquid without the need to operate close to the mud pool edge. The pressures are measured by the upper and lower pressure sensors set in the device body. Since the height difference between the pressure measuring surfaces of the upper and lower pressure sensors is known and the area of the pressure measuring surfaces of the pressure sensors is also known, the specific gravity of the mud and the current depth of the device body can be calculated, with simple operation and time-saving and labor-saving.

[0042] 3. The suspended full-condition electronic mud specific gravity detection device is provided with a charging interface, which can effectively charge the battery. By clamping the two end caps on the data cable interface and the charging interface respectively, and then rotating the rubber plug into the protective frame, and by rotating the fastening screw, the lower end of the fastening screw is screwed into the threaded hole to ensure the stability of the rubber plug. Through the mutual cooperation of the rubber plug and the end cap, the data cable interface and the charging interface can be effectively protected doubly.

[0043] 4. When the present invention measures the specific gravity, the two pressure sensors perform paired measurement, data transmission and calculation at the same time, avoiding the influence of liquid level fluctuation; through the step of filtering data, the influence caused by excessive data deviation is excluded; at the same time, a mode adjusted according to the multiple X and according to the difference Δ is set, effectively improving the accuracy of specific gravity calculation. When the present invention measures the depth, the idea of calculus is adopted for segmented cumulative calculation to improve the accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic structural diagram of the suspended full-condition electronic mud specific gravity detection device of the present invention when detecting the surface mud specific gravity;

[0045] Figure 2 It is a schematic structural diagram of the suspended full-condition electronic mud specific gravity detection device of the present invention when detecting the deep mud specific gravity;

[0046] Figure 3 It is a schematic installation structure diagram of the pressure sensor, the balance frame and the circular spirit level bubble of the present invention;

[0047] Figure 4 It is a sectional view of the cylinder body of the present invention;

[0048] Figure 5 It is a schematic structural diagram of the waterproof structure of the present invention;

[0049] Figure 6 It is a schematic structural diagram of the pressure sensor of the present invention;

[0050] Figure 7 It is a schematic structural diagram of the balance frame of the present invention;

[0051] Figure 8 It is a schematic structural diagram of the counterweight block and the buoyancy block of the present invention;

[0052] Figure 9 It is a schematic diagram of the relationship between the mud specific gravity and the mud liquid depth in the present invention.

[0053] In the figure: 1. Cylinder body; 101. Mounting plate; 102. Battery; 103. Circuit board; 104. Socket; 105. Data cable interface; 106. Charging interface; 2. Pressure sensor; 3. Balance frame; 301. Slot; 4. Circular spirit level bubble; 5. Protective cover; 501. Suspension ring; 6. Counterweight; 7. Buoyancy block; 8. Copper wire suspension rope; 9. Measuring rod; 901. Guide ring; 10. Wire reel; 11. Bluetooth gain antenna; 12. Signal wire; 13. Waterproof structure; 1301. Protective frame; 1302. Rubber plug; 1303. Fastening screw; 1304. End cover. Detailed implementation manners

[0054] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0055] Please refer to Figures 1-8 , a suspended full-condition electronic mud specific gravity detection device, including a cylinder body 1, a measuring rod 9 and a signal wire 12. Pressure sensors 2 are arranged at both ends of the inner part of the cylinder body 1 with openings. A mounting plate 101 is arranged in the middle of the inner part of the cylinder body 1. One side of the upper surface of the mounting plate 101 is provided with a battery 102, and on the upper surface of the mounting plate 101 and on one side of the battery 102 is provided a circuit board 103. The battery 102 is electrically connected to the circuit board 103, and both pressure sensors 2 are electrically connected to the circuit board 103. Protective covers 5 are arranged on both end faces of the cylinder body 1, and above the protective cover 5 located at the upper end of the cylinder body 1 is provided a copper wire suspension rope 8.

[0056] Among them; a wire reel 10 is arranged on the lower surface of the measuring rod 9. A guide ring 901 is arranged on the lower surface of the measuring rod 9 and on one side of the wire reel 10. A wiring seat is arranged on the lower surface of the measuring rod 9 and between the guide ring 901 and the wire reel 10. The upper end of the copper wire suspension rope 8 passes through the guide ring 901 and the wiring seat and is wound around the wire reel 10. By providing the wire reel 10, it can be effectively used to wind or release the copper wire suspension rope 8 to effectively adjust the depth of the cylinder body 1 placed inside the mud pit. By providing the guide ring 901, it can effectively support and guide the copper wire suspension rope 8.

[0057] Among them, a socket 104 is opened at the upper end of the outer surface of the cylinder 1, and a circular level bubble 4 is inserted through the socket 104. A balance frame 3 is sleeved at the lower end of the outer surface of the cylinder 1. The interior of the balance frame 3 is divided into a plurality of slots 301 by a partition. The slots 301 can be used to insert balance blocks. The circular level bubble 4 with a plug is inserted into the cylinder 1 as a whole, and the device is suspended in clean water. The position of the bubble is observed, and the bubble is returned to the center position by adding or removing the balance blocks on the outer shell, and the verticality calibration is performed to ensure the accuracy of subsequent detection.

[0058] Among them, two protective covers 5 are each provided with a lifting ring 501 at one end away from the cylinder 1, the upper end of the protective cover 5 located at the upper end of the cylinder 1 is connected to a buoyancy block 7 through the lifting ring 501, and the lower end of the copper wire lifting rope 8 is connected to the buoyancy block 7, and the lower end of the protective cover 5 located at the lower end of the cylinder 1 is connected to a counterweight block 6 through the lifting ring 501, and both the counterweight block 6 and the buoyancy block 7 are detachable. When performing surface mud gravity detection, based on the actual situation of the roughly estimated mud density, it is possible to choose to add a buoyancy block 7 to the upper end of the cylinder 1, or to hang a counterweight block 6 at the lower end, so that the device can be suspended in the mud, and the upper pressure sensor 2 can be completely submerged in the mud for easy detection; when performing deep mud gravity detection, based on the actual situation of the roughly estimated mud density, it is possible to choose whether to hang a counterweight block 6 at the lower end of the cylinder 1, so that the device can sink smoothly into the mud.

[0059] Among them; a data line interface 105 is provided on the upper end of the outer surface of the cylinder 1 away from the socket 104, a charging interface 106 is provided on the outer surface of the cylinder 1 and below the data line interface 105, and a waterproof structure 13 is provided on the outside of the data line interface 105 and the charging interface 106. By providing the charging interface 106, the battery 102 can be effectively charged; by providing the data line interface 105, an external data cable can be connected; by providing the waterproof structure 13, the data line interface 105 and the charging interface 106 can be effectively waterproof.

[0060] Wherein, the waterproof structure 13 includes a protective frame 1301, a rubber plug 1302 and a fastening screw 1303. The front ends of the data cable interface 105 and the charging interface 106 pass through the bottom wall of the protective frame 1301 and extend into the interior of the protective frame 1301. End caps 1304 are provided at the front openings of the data cable interface 105 and the charging interface 106. The rubber plug 1302 is inserted into the interior of the protective frame 1301. The upper end of the rubber plug 1302 is rotatably connected to the protective frame 1301 through a limiting shaft. The fastening screw 1303 is provided at the lower end of the rubber plug 1302. A threaded hole matching the fastening screw 1303 is provided at the lower end of the inner bottom surface of the protective frame 1301. By respectively clamping the two end caps 1304 on the data cable interface 105 and the charging interface 106, and then rotating the rubber plug 1302 to be inserted into the interior of the protective frame 1301, and by rotating the fastening screw 1303, the lower end of the fastening screw 1303 is screwed into the threaded hole to ensure the stability of the rubber plug 1302. Through the mutual cooperation of the rubber plug 1302 and the end caps 1304, the data cable interface 105 and the charging interface 106 can be effectively protected in a dual manner.

[0061] Wherein, an insertion interface is provided on the outer surface of the cylinder body 1 and above the waterproof structure 13. A Bluetooth gain antenna 11 is provided on the upper end surface of the side of the cylinder body 1 away from the socket 104 through the insertion interface. A wireless communication module is provided on the circuit board 103. The Bluetooth gain antenna 11 is electrically connected to the circuit board 103 through the wireless communication module. The Bluetooth gain antenna 11 is detachable. The circuit board 103 is signal-connected to the mobile phone through the wireless communication module. By providing the Bluetooth gain antenna 11, the wireless signal can be effectively concentrated and amplified, thereby improving the transmission distance and reception sensitivity of the signal.

[0062] A detection method for a suspended full-condition electronic mud specific gravity detection device includes the following steps:

[0063] S1. Device verticality calibration: By inserting the circular spirit level 4 with a plug on the cylinder body of the device main body 1 to be integrated, suspending the device in clear water, observing the position of the bubble, and adding or reducing the balance blocks on the outer shell to make the bubble return to the middle position for verticality calibration to ensure the accuracy of later detection;

[0064] S2. Surface mud specific gravity detection: According to the actual situation of roughly estimating the mud density, choose to hang a buoyancy block 7 at the upper end of the cylinder body 1 or hang a counterweight block 6 at the lower end, so that the device can float in the mud and the upper pressure sensor 2 can be completely submerged in the mud;

[0065] S3. Approach the mud pond to be measured, and use the measuring rod 9 and the copper wire suspension rope 8 to project the device out, and operate the wire reel 10 to slowly lower the device into the mud liquid;

[0066] S4. Start measuring the pressure through the upper and lower pressure sensors 2 in the mobile phone APP instruction device, transmit the measured pressure value to the mobile phone APP via Bluetooth, and then calculate the specific gravity of the mud according to the set calculation formula, where:

[0067] Calculation formula:

[0068] The height difference between the pressure measuring surfaces of the upper and lower pressure sensors 2 is Δh, the area of the pressure measuring surface of the sensor is S, and the measured pressures are F1 and F2;

[0069] Then the pressures P1 = F1 / S and P2 = F2 / S measured by the upper and lower pressure sensors 2,

[0070] The mud specific weight γ = (P2 - P1) / Δh, and the specific gravity is γ / γ 水 .

[0071] Furthermore, the accuracy of the specific gravity calculation can be improved. The two pressure sensors 2 measure, send data, and calculate in pairs synchronously; specifically including:

[0072] Step 1. According to the set initial filtering duration t, filter the data measured within the initial duration t for each measurement. Since it is considered that the pressure sensor is unstable when just powered on, the first step of filtering is carried out.

[0073] Step 2. For the remaining paired data, calculate the specific gravity γi; γi = (P2i - P1i) / (ρwater·g·h), where P1i and P2i are the pressures measured by the upper and lower pressure sensors, g is the acceleration due to gravity, h is the center height of the two pressure sensors, and ρwater is the density of pure water. Because of the liquid level fluctuation, the pressure sensors 2 must measure, transmit, and perform subsequent calculations in pairs at the same time.

[0074] Step 3. Filter the γi that is not within the set effective value range R. By filtering the data effective range, the data deviation caused by accidental unknown reasons is excluded.

[0075] Step 4. Take the arithmetic mean of the remaining γi to obtain γ';

[0076] Step 5. Calculate Di = |γi - γ'| / γ'. Through iterative calculation, further exclude the data with too large deviation.

[0077] Step 6. Filter the γi corresponding to Di greater than the set effective deviation D;

[0078] Step 7. Repeat steps 4 to 6, and the number of repetitions is the set number of iterations N to obtain the final result γ";

[0079] Step 8: Perform error correction on γ” in Step 7 to obtain γ = γ”·X + Δ; where X represents adjustment by a multiple and can be set as a three-digit decimal in the range of 0.001 to 9.999; Δ represents adjustment by a difference and can be set as a three-digit decimal in the range of -9.999 to 9.999. Considering the reasons of installation accuracy and the subsequent instrument calibration requirements, a mode of adjustment according to the multiple X and according to the difference Δ is set.

[0080] Specifically, the specific determination processes of X and Δ are as follows:

[0081] 1) Prepare a group (two types) of liquids with known specific gravities, and their actual specific gravities are γ01 and γ02 respectively;

[0082] 2) Use this device to measure them, and the measured specific gravities are γ1 and γ2 respectively;

[0083] 3) Establish equations γ01 = γ1·X + Δ and γ02 = γ2·X + Δ;

[0084] 4) Solve the above two equations simultaneously to obtain X and Δ.

[0085] Note: If it is desired to improve the determination accuracy of the X and Δ parameters, multiple groups of liquids with different specific gravities can be used, and the above 4 steps can be repeated. Take the arithmetic mean of the calculated X and Δ.

[0086] Since there are certain errors in the processing and assembly of the device, such as the actual installation height difference Δh of the sensor deviating greatly from the design, or there are certain deviations in the sensor itself, and the wear on the device during use, systematic errors may be generated. In most cases, these systematic errors will cause a certain multiple relationship or a fixed difference relationship between the measured value and the actual value. Therefore, it is necessary to periodically correct the parameters of the instrument. So two correction methods are provided, namely adjustment by the multiple X and adjustment by the fixed difference Δ, and the two methods can act simultaneously.

[0087] 9) Display and store the final result γ.

[0088] For the calculation of the depth Hi:

[0089] The specific gravities of mud at different depths are affected by various factors such as soil / rock layer characteristics and hole diameters, and there is a non-functional relationship between them. At any depth hi, for the measured pressure Pi and specific gravity γi, the error of directly calculating using hi = Pi / γi is relatively large. In view of the reasons for different specific gravities at different depths, with the help of the idea of calculus, segmented cumulative calculation is carried out to improve the accuracy. To perform a more accurate calculation of the depth Hi, establish a hi-γi curve graph to provide a basis for subsequent related research.

[0090] Such as Figure 9As shown, the abscissa is the mud specific gravity γ, and the ordinate is the mud liquid depth H, with the direction downward. The origin is the mud liquid surface, and the depth is 0.

[0091] The pay-off and take-up device 10 lowers the cylinder body 1 into the mud liquid surface at a normal and stable speed. The program is set to have the two pressure sensors 2 perform a pressure measurement simultaneously every short time interval Δt (for example, set Δt = 1 s). When measuring, the depth of the center position of the cylinder body is hi (i = 1, 2, 3…n). The measured results are converted into pressure values P1i and P2i. Then the mud pressure Pi at this place = (P1i + P2i) / 2, and the specific gravity γi = (P2i - P1i) / Δh;

[0092] Since the measurement interval time Δt of the pressure sensor 2 is small, within this period of time, the height difference of the lowering of the cylinder body 1 is relatively small, and the relative change in the mud specific gravity can be ignored. That is, it is considered that the mud specific gravity within the height range from h(i - 1) to hi is all γi. Then the pressure generated by the mud within the height range from h(i - 1) to hi (that is, the area of a single rectangle in the figure) pi = γi×(hi - h(i - 1)) = Pi - P(i - 1);

[0093] That is, hi = (Pi - P(i - 1)) / γi + h(i - 1). Iterating this formula gives

[0094] hi = (P1 - P0) / γ1 + (P2 - P1) / γ2 + (P3 - P2) / γ3 + … + (Pi - P(i - 1)) / γi, where the pressure P0 at the mud liquid surface = 0;

[0095] When programming, set the measurement interval time Δt of the pressure sensor 2 according to the actual situation, and a hi-γi curve graph that meets the requirements can be obtained.

[0096] It should be noted that: generally, the height of the cylinder body is relatively small, and the change in the mud specific gravity within this height range is ignored. The measured specific gravity can be approximately considered as the mud specific gravity at the center position of the cylinder body.

[0097] S5. Detection of deep mud specific gravity: According to the actual situation of roughly estimating the mud density, select whether to hang a counterweight block 6 at the lower end of the cylinder body 1 to enable the device to sink smoothly into the mud. Remove the Bluetooth gain antenna 11 from the device and connect it to the terminal block on the measuring rod 9. Connect the lower end of the antenna signal wire 12 to the socket, and connect the upper end of the antenna signal wire 12 to the copper wire suspension rope 8. Then repeat steps S1 - S4. The mud specific gravity can be calculated. After obtaining the mud specific gravity, calculate the depth at which the device is currently located through a formula. The operation is simple and time-saving and labor-saving.

[0098] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A suspended full-operating electronic mud specific gravity detection device, characterized in that: The invention comprises a cylinder (1), a measuring rod (9) and a signal line (12); pressure sensors (2) are arranged at both openings at the inside of the cylinder (1); a mounting plate (101) is arranged at the middle end of the cylinder (1); a battery (102) is arranged on one side of the upper surface of the mounting plate (101); a circuit board (103) is arranged on the upper surface of the mounting plate (101) and located on one side of the battery (102); the battery (102) is electrically connected to the circuit board (103); the two pressure sensors (2) are electrically connected to the circuit board (103); protective covers (5) are arranged on both end surfaces of the cylinder (1); and a copper wire suspension rope (8) is arranged above the protective cover (5) located at the upper end of the cylinder (1).

2. A suspended full-operating electronic mud specific gravity detection device according to claim 1, characterized in that: The lower end surface of the measuring rod (9) is provided with a wire retractor (10), the lower end surface of the measuring rod (9) is provided with a guide ring (901) located on one side of the wire retractor (10), the lower end surface of the measuring rod (9) is provided with a wiring seat located between the guide ring (901) and the wire retractor (10), and the upper end of the copper wire suspension rope (8) passes through the guide ring (901) and the wiring seat and is wound around the wire retractor (10).

3. A suspended full-operating electronic mud specific gravity detection device according to claim 1, characterized in that: The upper end of the outer surface of the cylinder (1) is provided with a socket (104), and a circular level bubble (4) is inserted into the upper end of the outer surface of the cylinder (1) through the socket (104). The lower end of the outer surface of the cylinder (1) is sleeved with a balance frame (3), and the interior of the balance frame (3) is divided into a plurality of slots (301) by a partition, and the slots (301) can be used to insert balance weights.

4. The suspended full-operating electronic mud specific gravity detection device according to claim 1 is characterized in that: The two protective covers (5) are each provided with a lifting ring (501) at one end away from the cylinder (1); the upper end of the protective cover (5) located at the upper end of the cylinder (1) is connected to a buoyancy block (7) via the lifting ring (501); the lower end of the copper wire lifting rope (8) is connected to the buoyancy block (7); the lower end of the protective cover (5) located at the lower end of the cylinder (1) is connected to a counterweight block (6) via the lifting ring (501); and both the counterweight block (6) and the buoyancy block (7) are detachable.

5. The suspended full-operating electronic mud specific gravity detection device according to claim 1 is characterized in that: A data line interface (105) is provided at the upper end of the outer surface of the cylinder (1) on the side facing away from the socket (104), a charging interface (106) is provided on the outer surface of the cylinder (1) and below the data line interface (105), and a waterproof structure (13) is provided on the outer sides of the data line interface (105) and the charging interface (106).

6. A suspended full-operating electronic mud specific gravity detection device according to claim 5, characterized in that: The waterproof structure (13) comprises a protective frame (1301), a rubber plug (1302) and a fastening screw (1303); the front ends of the data line interface (105) and the charging interface (106) pass through the bottom wall of the protective frame (1301) and extend into the interior of the protective frame (1301); and the front openings of the data line interface (105) and the charging interface (106) are both provided with end covers (1304).

7. A suspended full-operating electronic mud specific gravity detection device according to claim 6, characterized in that: The rubber plug (1302) is inserted into the protective frame (1301), the upper end of the rubber plug (1302) is rotatably connected to the protective frame (1301) via a limiting shaft, the fastening screw (1303) is arranged at the lower end of the rubber plug (1302), and a threaded hole that cooperates with the fastening screw (1303) is opened at the lower end of the bottom surface of the inner part of the protective frame (1301).

8. The suspended full-operating electronic mud specific gravity detection device according to claim 5 is characterized in that: A plug interface is provided on the outer surface of the cylinder (1) and located above the waterproof structure (13); a Bluetooth boost antenna (11) is provided at the upper end of the surface of the cylinder (1) away from the plug interface through the plug interface; a wireless communication module is provided on the circuit board (103); the Bluetooth boost antenna (11) is electrically connected to the circuit board (103) through the wireless communication module; the Bluetooth boost antenna (11) is detachable; and the circuit board (103) is connected to a mobile phone signal through the wireless communication module.

9. A detection method based on the suspended full-operating electronic mud specific gravity detection device according to claim 1, characterized in that: The following steps are involved: S1. Calibration of verticality of the device; S2. Surface mud specific gravity detection: Based on the actual estimated mud density, a buoyancy block (7) is added to the upper end of the cylinder (1), or a counterweight block (6) is hung at the lower end, so that the device can be suspended in the mud and the pressure sensor (2) above can be completely submerged in the mud; S3, approach the mud pool to be measured, suspend the device through the measuring rod (9) and the copper wire rope (8), and slowly put it into the mud liquid; S4, the upper and lower sensors (2) in the mobile phone APP command device start measuring pressure, and the measured pressure value is transmitted to the mobile phone APP via Bluetooth, and then the specific gravity of the mud is calculated according to the set calculation formula, where: Calculation formula: The height difference between the upper and lower pressure sensors (2) is Δh, the pressure measuring surface area of ​​the sensor is S, and the measured pressures are F1 and F2; Then the pressures measured by the upper and lower pressure sensors (2) are P1 = F1 / S, P2 = F2 / S, Mud weight γ = P2-P1 / Δh, specific gravity is γ / γ 水 ; For depth Hi calculation: The retractor (10) lowers the cylinder (1) into the mud liquid surface at a normal and steady speed. The program sets two pressure sensors (2) to simultaneously measure the pressure once every short time Δt. During the measurement, the depth of the center position of the cylinder (1) is hi (i=1, 2, 3...n). The measured result is converted into pressure values ​​P1i and P2i. The mud pressure at this location is Pi=(P1i+P2i) / 2, and the specific gravity γi=(P2i-P1i) / Δh. Since the measurement interval Δt of the pressure sensor (2) is relatively small, the height difference of the cylinder (1) during this period is relatively small, and the relative change of the mud specific gravity can be ignored, that is, it is assumed that the mud specific gravity within the height range from h(i-1) to hi is γi, then the pressure generated by the mud within the height range from h(i-1) to hi is pi=γi×(hi-h(i-1))=Pi-P(i-1); That is, hi = (Pi-P(i-1)) / γi+h(i-1), and iterating this formula yields: hi=(P1-P0) / γ1+(P2-P1) / γ2+(P3-P2) / γ3+…+(Pi-P(i-1)) / γi, where the pressure at the mud surface P0=0; When setting the program, the measurement interval time Δt of the pressure sensor (2) is set according to the actual situation, and the hi-γi curve diagram that meets the requirements can be obtained; S5. Deep mud density detection: Based on the actual estimated mud density, choose whether to hang a counterweight (6) at the lower end of the cylinder (1) so that the device can sink smoothly into the mud; repeat steps S1-S4.

10. The detection method according to claim 9, characterized in that: In step S5, before calibrating the verticality of the device, the Bluetooth gain antenna (11) needs to be removed from the device and connected to the wiring socket on the measuring rod (9), the lower end of the antenna signal line (12) needs to be plugged into the plug interface, and the upper end of the antenna signal line (12) needs to be connected to the copper wire suspension rope (8); Improved accuracy of specific gravity calculations, including: Step 1: Filter the data measured within each initial time t according to the set filtering initial time t; two pressure sensors (2) are paired to synchronously measure, send data and perform calculations; Step 2: For the remaining paired data, calculate the specific gravity γi; γi = (P2i-P1i) / (ρwater·g·h), P1i and P2i are the pressures measured by the upper and lower sensors (2), g is the gravitational acceleration, h is the center height of the two pressure sensors (2), and ρwater is the density of pure water; Step 3: filter the γi that is not within the set valid value range R; Step 4: Take the arithmetic mean of the remaining γi to obtain γ'; Step 5, calculate Di = |γi-γ'| / γ'; Step 6, filter the γi corresponding to Di greater than the set effective deviation D; Step 7, repeat steps 4 to 6, the number of repetitions is the set number of iterations N, and the final result γ" is obtained; Step eight, performing error correction on γ" in step seven to obtain γ=γ"·X+Δ, wherein X represents adjustment by multiple; Δ represents adjustment by difference.

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