Slurry viscosity measuring unit, measuring device and measuring method

Abstract

The invention belongs to the technical field of drilling cast-in-place pile slurry viscosity testing, and discloses a slurry viscosity measuring unit which comprises a slurry containing cylinder, a viscosity sampling cylinder, a slurry floating plate, a collecting assembly and a timer, and the slurry containing cylinder is provided with a containing inner cavity; the viscosity sampling barrel is provided with a sampling inner cavity with an open upper part, the sampling inner cavity is communicated with the accommodating inner cavity through a mud passing channel, and the mud passing channel is provided with a first opening and a second opening; the collecting assembly is movably arranged in the sampling inner cavity along with the mud floating plate and comprises a first liquid level sensor and a second liquid level sensor, the first liquid level sensor is arranged in the containing inner cavity and has the same gravitational potential as the first opening, and the second liquid level sensor is arranged at the top of the sampling inner cavity and has the same gravitational potential as the second opening; and the timer is triggered by a pressure signal of the first liquid level sensor to start timing and is triggered by a pressure signal of the second liquid level sensor to end timing. The invention further discloses a mud viscosity measuring device and a mud viscosity measuring method based on the measuring unit.

Description

Technical Field

[0001] The invention belongs to the technical field of bored pile mud viscosity testing, and in particular relates to a mud viscosity measuring unit, a measuring device and a measuring method. Background Art

[0002] Mud is a commonly used form of wall protection in bored pile drilling, oil drilling, geological exploration, and caisson lowering. During the construction of bored piles, mud is applied to balance the hydrostatic pressure in the soil and prevent the hole wall from collapsing. At the same time, the adsorption capacity of mud can carry drilling cuttings and debris. Whether in the drilling stage or the pouring stage, the quality of mud has an important influence on the pile effect.

[0003] Mud viscosity is a key indicator for testing mud during the preparation process, but the traditional testing method requires 1-2 people to complete it, and the test subjects are more subjective during the test. Viscosity testing is prone to deviations, which affects accuracy, resulting in waste of time, materials and labor, affecting progress during construction site or laboratory testing, and increasing the workload of staff.

[0004] At present, in response to this, the industry has also seen some improved mud viscosity measurement devices and methods. Chinese invention patent applications: A viscosity testing device and method for mud wall ratio experiment (application publication number: CN114923814A) and Chinese utility model patents: An automatic timing viscosity detector for shield grouting materials (authorization announcement number: CN 219245294 U) are typical of such technologies.

[0005] The former technical solution calculates the mud viscosity based on the amount of mud flowing out of the funnel neck. However, a large amount of mud is stuck in the funnel neck below the piston, resulting in the actual amount of mud flowing out being more than the amount of mud in the measuring cup, which in turn makes the measured value of the mud viscosity smaller than the true value, that is, the measurement error of the mud viscosity is large; the latter uses the time point when the mud is monitored by the liquid level sensor installed on one side of the measuring cup as the time terminal. However, the action of pouring the mud into the cup through the funnel will cause the mud liquid level in the cup to change, thereby causing fluctuations in the mud surface. Therefore, the liquid level sensor often monitors the mud peak surface (while the actual mud has not reached the 500ml liquid level). Therefore, the amount of mud in the measuring cup of Comparative Document 2 is less than 500ml, which will cause the measured mud viscosity value to be greater than the true value.

[0006] In summary, there are inevitable errors in the measurement results implemented above, resulting in low accuracy of the mud viscosity measurement results. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a mud viscosity measuring unit, a measuring device and a measuring method, which can accurately measure the mud viscosity.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A mud viscosity measuring unit, characterized in that it includes: a mud containing cylinder, having a containing cavity for containing a predetermined batch of mud; a viscosity sampling cylinder, having a sampling cavity opened at the top, the sampling cavity being connected to the containing cavity through a mud passage, and the mud passage having a first opening located in the containing cavity, and a second opening located in the sampling cavity; a mud floating plate, having a specific gravity less than that of the mud, and being vertically movably arranged inside the sampling cavity, a collection component, including a first liquid level sensor and a second liquid level sensor, the first liquid level sensor being arranged in the containing cavity, the first liquid level sensor having the same gravity potential as the first opening, and the second liquid level sensor being arranged at the top of the sampling cavity; a timer, which starts timing when triggered by a pressure signal of the first liquid level sensor and ends timing when triggered by a pressure signal of the second liquid level sensor.

[0010] Preferably, the viscosity sampling cylinder is arranged inside the mud containing cylinder.

[0011] Furthermore, the bottom surface of the accommodating inner cavity has the same gravitational potential as the first opening, and the first liquid level sensor is embedded in the bottom surface of the accommodating inner cavity.

[0012] Preferably, a guide rail portion is formed on the inner wall of the sampling inner cavity along the vertical direction, and a slide groove portion cooperating with the guide rail portion is formed on the peripheral surface of the mud floating plate.

[0013] A mud viscosity measuring device, characterized in that it includes: a base; a mud viscosity measuring unit such as the above, the mud viscosity measuring unit is arranged on the base, and the top of the mud containing tube has a mud inlet, and a conveying unit includes a mud conveying funnel, the mud conveying funnel has a mud outlet, and the mud outlet is located directly above the mud inlet.

[0014] Preferably, the base also includes a vertically extending guide column, and the conveying unit also includes a vertical drive assembly, the vertical drive assembly includes a drive motor, a drive screw and a movable bracket, the output shaft of the drive motor extends vertically, the drive screw is located near the guide column, and the drive screw is coaxially coupled with the output shaft of the drive motor, the movable bracket is threadedly matched with the drive screw, and is fitted on the guide column, and the movable bracket also has a funnel setting hole, and the mud conveying funnel vertically passes through the funnel setting hole.

[0015] Preferably, the mud outlet is opened and closed by a controllable switch valve.

[0016] Preferably, the mud conveying funnel also has a mud inlet opposite to the mud outlet, the mud inlet is larger than the mud outlet, and the mud inlet is closed and provided with a mud screening screen.

[0017] A method for measuring mud viscosity, based on the above-mentioned measuring device, is characterized by comprising the following steps:

[0018] Step S1: injecting mud into the receiving cavity through the mud conveying funnel, and at the same time, driving the mud conveying funnel to rise by a driving motor, so that during the mud injection process, the distance between the mud liquid level in the receiving cavity and the mud outlet remains unchanged;

[0019] Step S2: the mud contacts the first liquid level sensor in the containing cavity, so that the timer starts timing, and the mud enters the sampling cavity through the mud passage;

[0020] Step S3: the mud continues to enter the sampling cavity, so that the mud level in the sampling cavity continues to rise, and the mud is driven by buoyancy to continue to rise in the sampling cavity along with the mud float;

[0021] Step S4: As the mud floating plate contacts the second liquid level sensor, the timer ends the timing, thereby obtaining the time length for the mud to fill the sampling cavity and serving as the single flushing time length.

[0022] Step S5: Obtain mud viscosity based on the volume of the sampling cavity and the duration of a single stroke.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1. The mud viscosity measuring unit of the present invention comprises a mud containing cylinder, a viscosity sampling cylinder, a mud floating plate, a collection assembly and a timer. The mud containing cylinder has a containing inner cavity. The viscosity sampling cylinder has a sampling inner cavity with an upper opening, the sampling inner cavity is connected with the containing inner cavity through a mud passage, and the mud passage has a first opening and a second opening. The mud floating plate is movably arranged in the sampling inner cavity. The collection assembly comprises a first liquid level sensor and a second liquid level sensor. The first liquid level sensor is arranged in the containing inner cavity and has the same gravity potential as the first opening. The second liquid level sensor is arranged at the top of the sampling inner cavity. The timer is measured by the first liquid level sensor. The timing is started by the pressure signal of the first liquid level sensor and ended by the pressure signal of the second liquid level sensor. When the mud holding tube contains mud and the mud enters the sampling cavity, the mud exerts pressure on the first liquid level sensor and the timer starts timing. When the liquid level of the mud in the sampling cavity rises and the mud float plate exerts pressure on the second liquid level sensor, the timer starts timing. That is, the filling time required for the mud to enter the sampling cavity and fill the sampling cavity can be obtained. Since the volume of the sampling cavity is determined, the present invention can accurately measure the mud viscosity based on the determined volume and filling time of the sampling cavity.

[0025] 2. Because the viscosity sampling tube of the present invention is arranged inside the mud containing tube, the structure of the present invention is more compact.

[0026] 3. Because the base of the present invention also includes a guide column, the conveying unit also includes a vertical drive assembly, the vertical drive assembly includes a drive motor, a drive screw and a movable bracket, the drive screw is located near the guide column, the movable bracket is threadedly matched with the drive screw, and is fitted on the guide column, and the movable bracket also has a funnel setting hole, and the mud conveying funnel vertically passes through the funnel setting hole. Therefore, the present invention can make the mud conveying funnel rise, thereby ensuring that the distance between the mud outlet and the continuously rising mud liquid level in the mud holding tube remains unchanged at all times, thereby stabilizing the impact on the mud in the mud holding tube.

[0027] 4. Because the mud conveying funnel of the present invention also has a mud inlet opposite to the mud outlet, the mud inlet is larger than the mud outlet, and the mud inlet is closed and blocked with a mud screening screen, therefore, the present invention can filter out large particles in the mud entering the mud conveying funnel, thereby preventing the influence of unexpected factors on the mud viscosity, and making the mud viscosity measurement more accurate.

[0028] 5. Because the mud outlet of the present invention is opened and closed by a controllable switch valve, the present invention can store a predetermined amount of mud in the mud conveying funnel through the control of the controllable switch valve, thereby adjusting the impact force of the mud falling into the mud holding tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a schematic diagram of a mud viscosity measuring unit according to an embodiment of the present invention;

[0030] Figure 2 for Figure 1 sectional view of

[0031] Figure 3 A schematic diagram of a sampling container according to an embodiment of the present invention;

[0032] Figure 4 A schematic diagram of a mud viscosity measuring device according to an embodiment of the present invention;

[0033] Figure 5 is a schematic diagram of a mobile bracket according to an embodiment of the present invention;

[0034] Figure 6 Schematic diagram of the steps of a method for measuring mud viscosity according to an embodiment of the present invention.

[0035] In the figure: 10, mud viscosity measuring unit, 11, mud containing tube, 11a, containing inner cavity, 11b, mud inlet, 12, viscosity sampling tube, 12a, sampling inner cavity, 12b, first opening, 12c, guide rail, 13, mud floating plate, 141, first liquid level sensor, 142, second liquid level sensor, 100, mud viscosity measuring device, 20, base, 21, horizontal base plate, 22, vertical support, 221, Guide column, 30, conveying unit, 31, vertical drive assembly, 311, drive motor, 312, drive screw, 313, movable bracket, 3131, clamping screw, 313a, funnel setting hole, 313b, matching screw hole, 313c, guide through hole, 32, mud conveying funnel, 32a, mud outlet, 321, mud screening filter, 322, controllable switch valve, C, control console, S100, mud viscosity measurement method. DETAILED DESCRIPTION

[0036] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the following embodiments and the accompanying drawings specifically illustrate the mud viscosity measuring unit, measuring device and measuring method of the present invention. It should be noted that the description of these embodiments is used to help understand the present invention, but does not constitute a limitation of the present invention.

[0037] like Figure 1 and Figure 2 As shown, the mud viscosity measuring unit 10 in this embodiment includes a mud containing tube 11, a viscosity sampling tube 12, a mud floating plate 13, a collection component and a timer (not shown in the drawings).

[0038] The mud receiving tube 11 has a receiving inner cavity 11 a and a mud inlet 11 b .

[0039] The accommodating inner cavity 11a is used to accommodate a predetermined batch of mud. A mud inlet 11b is formed at the upper part of the mud accommodating tube 11, so that the accommodating inner cavity 11a is used to accommodate a predetermined batch of mud, and the predetermined batch of mud is poured into the interior of the accommodating inner cavity 11a from the mud inlet 11b. Specifically, the accommodating inner cavity 11b is cylindrical.

[0040] like Figure 3 As shown, the viscosity sampling tube 12 is disposed inside the mud containing tube 11 and has a sampling inner cavity 12a, a first opening 12b and a guide rail portion 12c.

[0041] The upper part of the sampling inner cavity 12a is open, and the sampling inner cavity 12a is connected with the accommodating inner cavity 11a through a mud passage (not shown in the drawings), the first opening 12b is the opening of the mud passage located on the side of the accommodating inner cavity 11a, and the second opening located in the sampling inner cavity 12a (not shown in the drawings), in this embodiment, the viscosity sampling cylinder 12 is arranged at the edge of the accommodating inner cavity 11a, and the viscosity sampling cylinder 12 is fixedly arranged through the accommodating inner cavity 11a. The accommodating inner cavity 11a and the sampling inner cavity 12a share a horizontal bottom surface.

[0042] The bottom surface of the accommodating inner cavity 11a and the first opening 12b have the same gravitational potential. In this embodiment, the accommodating inner cavity 11a and the sampling inner cavity 12a share a horizontal bottom surface, and the first opening 12b is correspondingly connected to the bottom of the sampling inner cavity 12a.

[0043] The guide rail portion 12c is formed on the inner wall of the sampling inner cavity 12a along the vertical direction. Specifically, the guide rail portion 12c is a vertically extending raised guide rail, and there are multiple guide rail portions 12c, which are evenly arranged along the circumference of the sampling inner cavity 12a.

[0044] The mud floating plate 13 is arranged inside the sampling inner cavity 12a, and a slide groove portion (not shown in the drawings) cooperating with the guide rail portion 12c is formed on the peripheral surface of the mud floating plate 13, so that it can move vertically in the sampling inner cavity 12a, and the specific gravity of the mud floating plate 13 is less than that of the mud, that is, the mud floating plate 13 will float on the mud liquid surface.

[0045] The collection component includes a first liquid level sensor 141 and a second liquid level sensor 142 .

[0046] The first liquid level sensor 141 is embedded in the bottom surface of the containing inner cavity 11a. The first liquid level sensor 141 and the first opening 12b have the same gravity potential. The second liquid level sensor 142 is arranged at the top of the sampling inner cavity 12a. Specifically, the universal liquid level sensor is triggered by buoyancy, that is, external pressure is applied to it. When mud covers the first liquid level sensor 141, the first liquid level sensor 141 is triggered by pressure. When the mud continues to rise in the sampling inner cavity 12a, the floating plate 13 is continuously lifted, and when the mud is lifted, the floating plate 13 is lifted. When the float plate 13 pushes against the second liquid level sensor 142, the first liquid level sensor 141 is triggered due to the pressure. In the present embodiment, the first liquid level sensor 141 is embedded in the horizontal bottom surface of the accommodating cavity 11a. The bottom surface of the sampling cavity 12a is the horizontal bottom surface of the accommodating cavity 11a, and the volume of the sampling cavity 12a is the volume from the second liquid level sensor 142 to the above-mentioned horizontal bottom surface, which is 500ml. The outer surface of the mud containing cylinder 11 also has a 500ml capacity scale line corresponding to the second liquid level sensor 142.

[0047] The timer starts timing when triggered by the pressure signal of the first liquid level sensor 141 and ends timing when triggered by the pressure signal of the second liquid level sensor 142 .

[0048] like Figure 4 As shown, the mud viscosity measuring device 100 includes a mud viscosity measuring unit 10 , a base 20 and a conveying unit 30 .

[0049] The mud viscosity measuring unit 10 is horizontally arranged on the base 20 , and the top of the mud containing tube 11 has a mud inlet 11 b .

[0050] The base 20 includes a vertically extending guide column 211. Specifically, the base 20 is composed of a horizontal base plate 21 and an upright bracket 22. The mud holding cylinder 11 is fixedly arranged on the horizontal base plate 21. The guide column 22 is arranged on the upright bracket 22, and the number of the guide columns 22 is two.

[0051] The conveying unit 30 includes a vertical driving assembly 31 and a mud conveying funnel 32 .

[0052] The vertical driving assembly 31 includes a driving motor 311 , a driving lead screw 312 and a moving bracket 313 .

[0053] The output shaft of the driving motor 311 extends vertically, the driving screw 312 is located near the guide column 22, and the driving screw 312 is coaxially coupled with the output shaft of the driving motor 311. Specifically, the driving motor 311 and the driving screw 312 are both arranged on the vertical bracket 21.

[0054] like Figure 5 As shown, the movable bracket 313 is threadedly matched with the driving screw 312 , and the movable bracket 313 is sleeved on the guide column 221 .

[0055] The movable bracket 313 is formed with a funnel setting hole 313a, a matching screw hole 313b and a guide through hole 313c. Specifically, the matching screw hole 313b and the driving screw rod 312 form a ball screw pair. There are two guide through holes 313c. The movable bracket 313 is passed through the two guide through holes 313c on the two guide columns 22, so that when the driving motor 311 is activated, the movable bracket 313 moves vertically relative to the base 20.

[0056] The mud conveying funnel 32 vertically passes through the funnel setting hole 313a, and is assembled and positioned by tightening the ingot screws 3131.

[0057] The mud conveying funnel 32 has a mud inlet (not shown in the drawings) and a mud outlet 32a opposite to each other in the vertical direction. The mud inlet is larger than the mud outlet 32a. The mud outlet 32a is closer to the mud containing tube 11 than the mud inlet, and the mud outlet 32a is located directly above the mud inlet.

[0058] The mud inlet 32a is closed and provided with a mud screening screen 321 , and the mud outlet is opened and closed by a controllable switch valve 322 .

[0059] Specifically, the mud viscosity measuring device 100 also includes a control console C, which is connected to the acquisition component and the controllable switch valve 322 signal. The operator issues instructions on the control console C to control the controllable switch valve 322 to open and close the mud outlet 32a, and when the first liquid level sensor 141 and the second liquid level sensor 142 are in operation, they can be visually presented to the operator through the control console C.

[0060] like Figure 6 As shown, the mud viscosity measuring method S100 implemented based on the above-mentioned mud viscosity measuring device 100 includes the following steps:

[0061] Step S1: inject mud into the accommodating inner cavity 11a through the mud conveying funnel 32, and at the same time, drive the mud conveying funnel 32 to rise by the driving motor 311, so that during the mud injection process, the distance between the mud liquid level in the accommodating inner cavity 11a and the mud outlet 322 remains unchanged.

[0062] Step S2: The mud contacts the first liquid level sensor 141 in the containing inner cavity 11a, so that the timer starts timing, and at the same time, the mud enters the sampling inner cavity 12a through the mud passage.

[0063] Step S3: The mud continues to enter the containing inner cavity 12a, so that the mud liquid level in the sampling inner cavity 12a continues to rise, and the mud continues to rise in the sampling inner cavity 12a along with the mud floating plate 13 due to buoyancy.

[0064] Step S4: As the mud floating plate 13 contacts the second liquid level sensor 142, the timer stops timing, thereby obtaining the time length for the mud to fill the sampling inner cavity 12a and serving as the single flushing time length.

[0065] Step S5: Obtain mud viscosity based on the volume of the sampling inner cavity 12a and the single-stroke duration.

[0066] The above-mentioned implementation modes are preferred cases of the present invention and are not used to limit the protection scope of the present invention. Various deformations or modifications that can be made by ordinary technicians in this field without creative work within the scope of the attached claims are still within the protection scope of this patent.

Claims

1. A mud viscosity measuring unit, characterized in that: include: A mud holding cylinder having a holding inner cavity for holding a predetermined batch of mud; A viscosity sampling cylinder, having a sampling inner cavity with an open upper portion, the sampling inner cavity being connected to the containing inner cavity through a mud passage, and the mud passage having a first opening located in the containing inner cavity and a second opening located in the sampling inner cavity; The mud floating plate has a specific gravity less than the mud and is vertically movably arranged inside the sampling cavity. A collection component, comprising a first liquid level sensor and a second liquid level sensor, wherein the first liquid level sensor is disposed in the containing inner cavity, the first liquid level sensor and the first opening have the same gravity potential, and the second liquid level sensor is disposed at the top of the sampling inner cavity; A timer is triggered to start timing by the pressure signal of the first liquid level sensor and to end timing by the pressure signal of the second liquid level sensor.

2. The mud viscosity measuring unit according to claim 1, characterized in that: in, The viscosity sampling tube is arranged inside the mud containing tube.

3. The mud viscosity measuring unit according to claim 2, characterized in that: in, The bottom surface of the accommodating inner cavity has the same gravitational potential as the first opening, and the first liquid level sensor is embedded in the bottom surface of the accommodating inner cavity.

4. The mud viscosity measuring unit according to claim 1, characterized in that: in, A guide rail portion is formed on the inner wall of the sampling inner cavity along the vertical direction, and a slide groove portion matched with the guide rail portion is formed on the peripheral surface of the mud floating plate.

5. A mud viscosity measuring device, characterized in that: include: Pedestal; The mud viscosity measuring unit according to claim 3, wherein the mud viscosity measuring unit is arranged on the base, and the top of the mud containing tube has a mud inlet, The conveying unit comprises a mud conveying funnel having a mud outlet, and the mud outlet is located directly above the mud inlet.

6. The mud viscosity measuring device according to claim 5, characterized in that: in, The base also includes a vertically extending guide column. The conveying unit further comprises a vertical driving assembly, which comprises a driving motor, a driving screw and a moving bracket. The output shaft of the driving motor extends vertically, the driving screw is located near the guide column, and the driving screw is coaxially coupled with the output shaft of the driving motor, the movable bracket is threadedly matched with the driving screw, and is cooperatively sleeved on the guide column, and the movable bracket also has a funnel setting hole, and the mud conveying funnel vertically passes through the funnel setting hole.

7. The mud viscosity measuring device according to claim 5, characterized in that: in, The mud outlet is opened and closed by a controllable switch valve.

8. The mud viscosity measuring device according to claim 5, characterized in that: in, The mud conveying funnel also has a mud inlet opposite to the mud outlet, the mud inlet is larger than the mud outlet, and the mud inlet is closed and provided with a mud screening screen.

9. A method for measuring mud viscosity, based on the measuring device according to claim 6, characterized in that: The following steps are involved: Step S1: injecting mud into the containing inner cavity through the mud conveying funnel, and at the same time raising the mud conveying funnel through the driving motor, so that during the mud injection process, the distance between the mud liquid level in the containing inner cavity and the mud outlet remains unchanged; Step S2: the mud contacts the first liquid level sensor in the containing inner cavity, so that the timer starts timing, and the mud enters the sampling inner cavity through the mud passage; Step S3: Mud continues to enter the sampling inner cavity, so that the mud liquid level in the sampling inner cavity continues to rise, and the mud drives the mud floating plate to continue to rise in the sampling inner cavity through buoyancy; Step S4: The mud floating plate contacts the second liquid level sensor, so that the timer ends timing, thereby obtaining the time length for the mud to fill the sampling cavity and serving as the single flushing time length. Step S5: Obtaining mud viscosity based on the volume of the sampling inner cavity and the single-stroke duration.

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