CN114739765A - Vacuum air extraction device and method for geotechnical test - Google Patents
Vacuum air extraction device and method for geotechnical test Download PDFInfo
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- CN114739765A CN114739765A CN202210295597.1A CN202210295597A CN114739765A CN 114739765 A CN114739765 A CN 114739765A CN 202210295597 A CN202210295597 A CN 202210295597A CN 114739765 A CN114739765 A CN 114739765A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
Abstract
The invention discloses a vacuum air extraction device and a vacuum air extraction method for geotechnical tests, and the device specifically comprises a vacuum box body, a vacuum pump, an air extraction channel, an exhaust channel, a vacuum valve and a controller, wherein the vacuum box body is internally provided with a vacuum cavity, one side of the vacuum box body is provided with an opening communicated with the vacuum cavity, the opening is covered with a closed door body, one end of the air extraction channel and one end of the exhaust channel are both connected with the vacuum cavity through the vacuum valve, the other end of the air extraction channel is connected with the vacuum pump, a plurality of detection parts are arranged in the vacuum cavity along the height direction, a plurality of detection units are arranged in the detection parts, and the vacuum pump, the detection units and the vacuum valve are connected with the controller. In the invention, the operation of the vacuum pump is fed back and controlled by detecting the position of the sample in the sample container through the detection unit, so that the test accuracy is improved, and the working intensity of testers is reduced.
Description
Technical Field
The invention relates to the technical field of geotechnical test equipment, in particular to a vacuum pumping device and method for geotechnical tests.
Background
In soil tests and sediment density tests, the specification stipulates that the soil or sediment with the particle size of less than 5mm is tested by a pycnometer method, when the soil particles or sediment contain soluble salts, hydrophilic colloids or organic matters, the specific gravity of the soil particles or sediment is determined by using a neutral liquid, and air in the soil or sediment is removed by using a vacuum pumping method. The vacuum degree should be close to an atmospheric negative pressure value (-98KPa) during air suction, and the air suction time can be 1-2 hours until no bubble overflows in the suspension, and the suspension cannot overflow out of the bottle during the air suction process.
In fact, in the process of pumping the soil sample or the sediment, because the sample contains a large amount of air, a phenomenon that a large amount of air bubbles are pumped out of the sample suspension when the air pumping is started can occur, the air bubbles cannot be broken in time and flow to a specific gravity bottle mouth, so that the suspension overflows out of the specific gravity bottle along with the air bubbles, and the standard requirements cannot be met, in the prior test, in order to prevent the suspension from overflowing out of the specific gravity bottle in the air pumping process, a tester needs to crouch beside an air pumping device at the initial stage of the air pumping, constantly observe the condition of pumping the air bubbles out of the suspension, and needs to frequently open and close a vacuum air pump to prevent the suspension from overflowing out of the specific gravity bottle along with the air bubbles until the air bubbles pumped out of the suspension can burst in the specific gravity bottle by itself in the vacuum air pumping process and do not overflow any more, in the process, a large amount of manpower and time need to be consumed, and in the test process to ensure the reliability and integrity of the test, the batch test of the test samples under the same environment can be carried out, and due to the batch test of the samples, when a plurality of samples are placed, the situation that when a tester draws out bubbles in the suspension is observed, part of the sample suspension overflows out of the pycnometer along with the bubbles, so that the situation that the test data is inaccurate is caused.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a vacuum pumping device for geotechnical tests, which can solve the problem that soil samples or sediments are easy to overflow a sample container during pumping.
The second purpose of the invention is to provide a vacuum air-extracting method for geotechnical test, which can solve the problem that soil sample or sediment is easy to overflow the sample container during air-extracting process.
In order to achieve one of the purposes, the technical scheme adopted by the invention is as follows:
a vacuum air extraction device for geotechnical tests comprises a vacuum box body, a vacuum pump, an air extraction channel, an exhaust channel, a vacuum valve and a controller, wherein a vacuum cavity is arranged in the vacuum box body;
the vacuum valve is used for driving one of the air exhaust channel and the air exhaust channel to be communicated with the vacuum cavity;
the detection part is used for placing a sample container;
the detection unit is used for detecting the position of the sample in the sample container.
Preferably, a laminate is arranged at the upper end of the detection part, a vertical guide rail is connected between the laminate and the inner wall of the vacuum chamber, the lower end face of the laminate is connected with the detection unit, and the vertical guide rail is connected with the controller.
Preferably, still include a plurality of bottom plates, the bottom plate sets up the lower extreme at the detection portion, be connected with horizontal guide between the inner wall of bottom plate and vacuum cavity, the up end of bottom plate is provided with a plurality of constant head tanks corresponding pressure sensor, horizontal guide is connected with the controller.
Preferably, the laminate and the bottom plate are both provided with a plurality of air holes; the air hole is used for communicating any two detection parts which are adjacently arranged along the height direction of the vacuum cavity.
Preferably, the center point of the positioning groove coincides with the projection of the center point of the detection unit on the horizontal plane.
Preferably, the detection unit is one of a pressure sensor and a liquid level sensor.
Preferably, the closed door body is provided with a visible window.
In order to achieve the second purpose, the technical scheme adopted by the invention is as follows:
the vacuum air pumping method for the geotechnical test is applied to the controller of the vacuum air pumping device for the geotechnical test, and comprises the following steps of:
s1: placing a sample container filled with a sample in the detection part, driving the detection unit to extend into the sample container, and closing the closed door body;
s2: driving the vacuum valve to be in a first state, and driving the vacuum pump to pump air into the vacuum cavity through the air pumping channel, wherein the first state is that the exhaust channel is closed, and the air pumping channel is conducted;
s3: judging whether the sample floats to a preset position through the detection unit, if so, executing S4, and if not, executing S5;
s4: closing the vacuum pump, driving the vacuum valve to be in a second state for preset time, and executing S2, wherein the second state is that the exhaust channel is communicated and the pumping channel is closed;
s5: and judging whether the vacuum degree in the current vacuum cavity is maintained in a preset threshold value for a preset time, if so, closing the vacuum pump, driving the vacuum valve to be in a second state, and if not, executing S3.
Compared with the prior art, the invention has the beneficial effects that: the detection end of a detection unit in a detection part is extended into a sample container, then a vacuum valve is driven to be in a first state (namely, an exhaust channel is closed and the exhaust channel is communicated), a vacuum pump is driven to exhaust a vacuum cavity through the exhaust channel, then the detection unit is utilized to determine that a suspension is suspended to a preset position, after the suspension is suspended to the preset position, the vacuum valve is driven to be in a second state (namely, the exhaust channel is communicated and the exhaust channel is closed) so as to avoid that the suspension floats upwards along with the extracted bubbles, so that the sample suspension overflows, after the exhaust channel is communicated, the air pressure in the vacuum cavity is recovered to be normal, the suspension begins to descend, the uncracked bubbles are instantaneously ruptured under the influence of the air pressure, so that the bubbles generated by air exhaust are completely ruptured and eliminated, the initial liquid level is recovered, after the suspension is kept stand for a preset time, the vacuum valve is driven to be in the first state (namely, the exhaust channel is closed, pumping channel switches on), orders about the vacuum pump once more and bleeds to the vacuum cavity through pumping channel, and is so repeated, reaches to predetermineeing the threshold value and predetermineeing the time until the vacuum degree in the vacuum cavity, and the suspension does not float to preset position, can regard the operation of bleeding of sample to accomplish the automatic liquid-gas separation of experimental sample to realize the analysis and test of more accurately accomplishing the sample of testr.
Drawings
Fig. 1 is a schematic structural view of a vacuum suction device for an earth test according to the present invention.
Fig. 2 is a sectional view taken along a-a of fig. 1.
Fig. 3 is a schematic view of the bottom structure of the present invention.
Fig. 4 is a flow chart of the vacuum pumping method for the soil test in the invention.
In the figure: 1-a vacuum box body; 11-a vacuum chamber; 12-a detection section; 121-layer plate; 122-vertical guide rails; 123-a bottom plate; 124-horizontal guide rail; 125-positioning groove; 13-a detection unit; 14-pores; 2-a vacuum pump; 3-an air exhaust channel; 4-an exhaust channel; 5-vacuum valve.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention will be further described with reference to the accompanying drawings and the detailed description below:
in the present invention, the vacuum pump 2 may preferably be replaced by a negative pressure vacuum pump 2, preferably, the laminate 121 and the bottom plate 123 may be an integrated structure or two independent components, the vertical guide rail 122 and the horizontal guide rail 124 may be replaced by a screw rod, the controller may be an MCU, a single chip microcomputer or a PLC controller, further, an air pressure sensor is further disposed in the vacuum chamber 11 for detecting air pressure in the vacuum chamber 11, the vacuum chamber 1 is further provided with a warning device for reflecting the state of the vacuum pumping device of the geotechnical test to the outside, and the closed door body is provided with a visual window, so that a tester can observe the test condition in the vacuum chamber 11 through the visual window, so as to facilitate the tester to regularly observe the operation condition of each device in the vacuum chamber 11 and preferably, the detection unit 13 is one of a pressure sensor and a liquid level sensor, the device is used for extending into a sample container, and obtaining the position of a sample at present in the sample container, the sample container is preferably a pycnometer, and the sample can be submarine sediment, deep sea soil, soil particles and the like, namely, the device is not limited to be applied to geotechnical tests on land, and can also be applied to ocean engineering, and air suction tests can be carried out on the submarine sediment, the deep sea soil, the soil particles and the like.
The first embodiment is as follows:
as shown in fig. 1-4, a vacuum air extractor for geotechnical tests comprises a vacuum box 1, a vacuum pump 2, an air extracting channel 3, an exhaust channel 4, a vacuum valve 5 and a controller, wherein a vacuum cavity 11 is arranged inside the vacuum box 1, an opening communicated with the vacuum cavity 11 is formed in one side of the vacuum box 1, the opening is covered by a closed door body, one end of the air extracting channel 3 and one end of the exhaust channel 4 are both connected with the vacuum cavity 11 through the vacuum valve 5, the other end of the air extracting channel 3 is connected with the vacuum pump 2, a plurality of detection parts 12 are arranged in the vacuum cavity 11 along the height direction, a plurality of detection units 13 are arranged in the detection parts, and the vacuum pump 2, the detection units 13 and the vacuum valve 5 are connected with the controller; the vacuum valve 5 is used for driving one of the air exhaust channel 3 and the air exhaust channel 4 to be communicated with the vacuum cavity 11; the detection part 12 is used for placing a sample container; the detection unit 13 is configured to detect a position of the sample in the sample container.
Specifically, a sample is loaded into a sample container in advance, then the sample container filled with the sample is placed in an inspection part, then the detection end of a detection unit 13 is inserted into the sample container, a closed door body is closed, a vacuum valve 5 is driven to be in a first state (namely an exhaust channel 4 is closed, an exhaust channel 3 is conducted), a vacuum pump 2 is driven to exhaust air from a vacuum cavity 11 through the exhaust channel 3, due to the fact that the sample contains a large amount of air, the sample is suspended upwards (namely suspension is formed) during air exhaust, and a large amount of bubbles are gushed out in the initial stage, when the detection unit 13 detects that the suspension is suspended to a preset position, specifically, whether the suspension exists at the current position or not is judged through a liquid level sensor extending into a pycnometer for a certain depth, or whether the pressure generated by the suspension upwards floating at the current position is judged through a pressure sensor, when the suspension is suspended to the preset position, the vacuum valve 5 is driven to be in the second state (namely the exhaust channel 4 is conducted, and the air exhaust channel 3 is closed) so as to avoid the overflow of the sample due to the overlarge floating distance of the suspension, and in addition, the bubble gushed out of the suspension is broken after a certain time, and the bubble is prevented from escaping from the sample container by controlling the floating height of the suspension, so that the bubble is ensured to be in the same sample container from gushing to breaking, and the overflow of the sample and the cross contamination of the samples in different sample containers are prevented; when the exhaust passage 4 is conducted, the air pressure in the vacuum chamber 11 returns to normal, the suspension begins to drop, the unbroken air bubbles are instantaneously broken under the influence of the air pressure to ensure that all the air bubbles generated by air extraction are broken and eliminated, the initial liquid level is restored, after standing for a preset time, the vacuum valve 5 is driven to be in the first state (namely, the exhaust passage 4 is closed, the air extraction passage 3 is conducted), the vacuum pump 2 is driven to extract air from the vacuum chamber 11 through the air extraction passage 3 again, so that the sample is suspended upwards again (namely, the suspension is formed), the air bubbles flow out of the suspension, when the suspension is suspended to a preset position, the vacuum valve 5 is driven to be in the second state (namely, the exhaust passage 4 is conducted, the air extraction passage 3 is closed), the steps are repeated until the suspension is not suspended to the preset position, the vacuum degree in the vacuum chamber 11 reaches a preset threshold value, preferably, the preset threshold value is an atmospheric negative pressure value (-98KPa), the air pressure sensor in the vacuum cavity 11 can be used for judging that the detection unit 13 does not detect a signal of the suspension when the atmospheric negative pressure value (-98KPa) is reached, namely the suspension does not float to a preset position under the condition of the atmospheric negative pressure value (-98KPa) and reaches a preset time, the air suction operation of the sample can be considered to be finished, and further, the warning device can prompt the air suction to the outside to be finished, so that the automatic liquid-gas separation of the test sample is realized, namely the low-interference test sample is obtained to carry out the next-step test analysis, so that a tester can more accurately finish the analysis and test of the sample, and the pollution and the resource waste generated in the test are reduced.
Example two:
as shown in fig. 1-4, a vacuum air extractor for geotechnical tests comprises a vacuum box 1, a vacuum pump 2, an air extracting channel 3, an exhaust channel 4, a vacuum valve 5 and a controller, wherein a vacuum cavity 11 is arranged inside the vacuum box 1, an opening communicated with the vacuum cavity 11 is formed in one side of the vacuum box 1, the opening is covered by a closed door body, one end of the air extracting channel 3 and one end of the exhaust channel 4 are both connected with the vacuum cavity 11 through the vacuum valve 5, the other end of the air extracting channel 3 is connected with the vacuum pump 2, a plurality of detection parts 12 are arranged in the vacuum cavity 11 along the height direction, a plurality of detection units 13 are arranged in the detection parts, and the vacuum pump 2, the detection units 13 and the vacuum valve 5 are connected with the controller; the vacuum valve 5 is used for driving one of the air exhaust channel 3 and the air exhaust channel 4 to be communicated with the vacuum cavity 11; the detection part 12 is used for placing a sample container; the detection unit 13 is configured to detect a position of the sample in the sample container. In this embodiment, a layer plate 121 is disposed at an upper end of the inspection part 12, a vertical guide rail 122 is connected between the layer plate 121 and an inner wall of the vacuum chamber 11, a lower end surface of the layer plate 121 is connected to the inspection unit 13, and the vertical guide rail 122 is connected to the controller. Preferably, the detection device further comprises a plurality of bottom plates 123, the bottom plates 123 are disposed at the lower end of the detection part 12, a horizontal guide rail 124 is connected between the bottom plates 123 and the inner wall of the vacuum chamber 11, a plurality of positioning grooves 125 are disposed at the upper end of the bottom plates 123 corresponding to the pressure sensors, and the horizontal guide rail 124 is connected with the controller. Further, the laminate 121 and the bottom plate 123 are both provided with a plurality of air holes 14; the air hole 14 is used for communicating any two detection parts 12 which are adjacently arranged along the height direction of the vacuum cavity 11. Preferably, the center point of the positioning groove 125 coincides with the projection of the center point of the detection unit 13 on the horizontal plane.
In this embodiment, the bottom plate 123 is moved out of the vacuum chamber 11 by the horizontal guide rail 124, so that a tester can place a sample container with a sample on the bottom plate 123, preferably, the bottom plate 123 is provided with a positioning groove 125 for fixing the position and the posture of the sample container, then the horizontal guide rail 124 resets the bottom plate 123, then the vertical guide rail 122 drives the layer plate 121 to descend, so that the detection end of the detection unit 13 extends into the sample container, preferably, the center point of the positioning groove 125 coincides with the projection of the center point of the detection unit 13 on the horizontal plane, so that when the detection unit 13 enters the sample container, the sample container does not contact with the detection unit 13, the direct detection unit 13 directly enters the sample container, thereby avoiding a touch accident, which may cause the detection unit 13 to fail to operate normally or the sample container to tilt, so that the sample leaks or the detection unit 13 makes a false judgment, then, the sealing door body is closed, the vacuum valve 5 is driven to be in the first state (namely, the exhaust passage 4 is closed, and the exhaust passage 3 is conducted), and the vacuum pump 2 is driven to exhaust the vacuum cavity 11 through the exhaust passage 3, further, the laminate 121 and the bottom plate 123 are both provided with a plurality of air holes 14, so that the detection parts 12 in the vacuum cavity 11 are communicated, namely, the air pressures of the detection parts 12 are the same, and the test failure caused by air pressure errors is avoided. Because the sample contains a large amount of air, the sample is suspended upwards (namely, suspension is formed) during air extraction, and a large amount of bubbles gush out in the initial stage, when the detection unit 13 detects that the suspension is suspended to a preset position, specifically, whether the suspension exists at the current position or not is judged by the liquid level sensor extending into the sample container for a certain depth or whether the pressure generated by the suspension upwards floats at the current position is judged by the pressure sensor, when the suspension is suspended to the preset position, the vacuum valve 5 is driven to be in the second state (namely, the exhaust passage 4 is conducted, and the air extraction passage 3 is closed) to avoid the overflow distance of the suspension from being too large, so as to avoid the overflow of the sample, in addition, the bubbles gushed out of the suspension can be broken after a certain time, the bubbles are prevented from escaping from the sample container by controlling the upwards floating height of the suspension, and the bubbles are ensured to be all in the same sample container from gushing out to breaking, preventing sample spillage and cross-contamination of different sample containers; when the exhaust passage 4 is conducted, the air pressure in the vacuum chamber 11 returns to normal, the suspension begins to drop, the unbroken air bubbles are instantaneously broken under the influence of the air pressure to ensure that all the air bubbles generated by air extraction are broken and eliminated, the initial liquid level is restored, after standing for a preset time, the vacuum valve 5 is driven to be in the first state (namely the exhaust passage 4 is closed, the air extraction passage 3 is conducted), the vacuum pump 2 is driven to extract air from the vacuum chamber 11 through the air extraction passage 3 again, so that the sample is suspended upwards again (namely the suspension is formed), the air bubbles gush out from the suspension, when the suspension is suspended to a preset position, the vacuum valve 5 is driven to be in the second state (namely the exhaust passage 4 is conducted, the air extraction passage 3 is closed), the steps are repeated until the suspension is not suspended to the preset position, the vacuum degree in the vacuum chamber 11 reaches a preset threshold value, preferably, the preset threshold value is an atmospheric negative pressure value (-98KPa), the air pressure sensor in the vacuum chamber 11 can be used for judging that the detection unit 13 does not detect a signal of the suspension at an atmospheric negative pressure value (-98KPa), that is, the suspension does not float to a predetermined position under the condition of an atmospheric negative pressure value (-98KPa) and reaches a preset time, that is, the air suction operation of the sample is finished, and further, the warning device can prompt the completion of the air suction to the outside.
Example three:
as shown in fig. 1 to 4, a vacuum pumping method for an earth test, applied to a controller of a vacuum pumping device for an earth test according to the first or second embodiment, includes the following steps:
s1: placing a sample container filled with a sample in the detection part 12, driving the detection unit 13 to extend into the sample container, and closing the closed door body;
specifically, the bottom plate 123 is moved out of the vacuum chamber 11 by the horizontal guide rail 124, so that a tester can place a sample container with a sample on the bottom plate 123, preferably, the bottom plate 123 is provided with a positioning groove 125 for fixing the position and the placing posture of the sample container, then the horizontal guide rail 124 resets the bottom plate 123, then the vertical guide rail 122 drives the layer plate 121 to descend, so that the detection end of the detection unit 13 extends into the sample container, preferably, the center point of the positioning groove 125 coincides with the projection of the center point of the detection unit 13 on the horizontal plane, so that when the detection unit 13 enters the sample container, the sample container does not contact with the detection unit 13, the direct detection unit 13 directly enters the sample container, thereby avoiding the occurrence of a touch accident, causing the detection unit 13 to fail to operate normally or the sample container to incline, causing the sample leakage or the detection unit 13 to make a false judgment, and then closing the closed door body.
S2: driving the vacuum valve 5 to be in a first state, and driving the vacuum pump 2 to pump air into the vacuum cavity 11 through the air pumping channel 3, wherein the first state is that the exhaust channel 4 is closed, and the air pumping channel 3 is conducted;
specifically, the vacuum valve 5 is driven to be in the first state (i.e., the exhaust channel 4 is closed, and the exhaust channel 3 is conducted), and the vacuum pump 2 is driven to exhaust the vacuum chamber 11 through the exhaust channel 3, and further, the laminate 121 and the bottom plate 123 are both provided with a plurality of air holes 14, so that the detection portions 12 in the vacuum chamber 11 are communicated, i.e., the air pressures of the detection portions 12 are the same, and the test failure caused by air pressure errors is avoided.
S3: judging whether the sample floats to a preset position through the detection unit 13, if so, executing S4, and if not, executing S5;
specifically, because the sample contains a large amount of air, during the air exhaust, the sample appears the phenomenon of upwards suspending (namely forming the suspension) to can have a large amount of bubbles to gush out at initial stage, after detecting unit 13 detects that the suspension suspends to predetermined position, specifically, judge whether current position has the suspension through the level sensor who stretches into certain degree of depth in the sample container, perhaps pressure sensor judges whether current position has the pressure that the suspension produced to the come-up. After suspension suspended to predetermined position, order to drive vacuum valve 5 and be in state two (exhaust passage 4 switches on promptly, and air exhaust passage 3 closes) to avoid the suspension too big along with the distance of bubble come-up, lead to the sample to spill over, in addition, the bubble that the suspension was gushed out just can break after needing certain time, avoid the bubble to escape from the sample container through the height of control suspension come-up, ensure that the bubble from gushing out to break all in same sample container, prevent that the sample from spilling over and the sample cross contamination in the different sample containers.
S4: closing the vacuum pump 2, and driving the vacuum valve 5 to be in a second state for a preset time, and executing S2, wherein the second state is that the exhaust channel 4 is conducted, and the pumping channel 3 is closed;
specifically, after the exhaust channel 4 is conducted, the air pressure in the vacuum chamber 11 returns to normal, the suspension begins to drop, the unbroken bubbles are instantaneously broken under the influence of the air pressure, so that the bubbles generated by air suction are completely broken and eliminated, the initial liquid level is recovered, after the suspension is kept still for a preset time, the vacuum valve 5 is driven to be in the first state (namely, the exhaust channel 4 is closed, and the exhaust channel 3 is conducted), the vacuum pump 2 is driven to suck air into the vacuum chamber 11 through the exhaust channel 3 again, the sample is enabled to be upwards suspended again (namely, the suspension is formed), the bubbles are gushed out from the suspension, after the suspension is suspended to a preset position, the vacuum valve 5 is driven to be in the second state (namely, the exhaust channel 4 is conducted, and the exhaust channel 3 is closed), and the steps are repeated.
S5: and judging whether the vacuum degree in the vacuum chamber 11 is maintained in the preset threshold value for a preset time, if so, turning off the vacuum pump 2 and driving the vacuum valve 5 to be in the state two, and if not, executing S3.
Specifically, until the vacuum degree in the vacuum chamber 11 reaches a preset threshold value, preferably, the preset threshold value is an atmospheric negative pressure value (-98KPa), which can be determined by an air pressure sensor in the vacuum chamber 11, when the atmospheric negative pressure value (-98KPa) is reached, the detection unit 13 does not detect a signal of the suspension, that is, the suspension does not float to a predetermined position under the condition of the atmospheric negative pressure value (-98KPa), and the suction operation of the sample is considered to be completed when the atmospheric negative pressure value (-98KPa) is reached, and further, the warning device can prompt the outside that the suction operation is completed.
Various other modifications and changes may occur to those skilled in the art based on the foregoing teachings and concepts, and all such modifications and changes are intended to be included within the scope of the appended claims.
Claims (8)
1. The utility model provides a geotechnical test's vacuum air exhaust device which characterized in that: the device comprises a vacuum box body, a vacuum pump, an air exhaust channel, an exhaust channel, a vacuum valve and a controller, wherein a vacuum cavity is arranged in the vacuum box body, one side of the vacuum box body is provided with an opening communicated with the vacuum cavity, the opening is covered with a closed door body, one end of the air exhaust channel and one end of the exhaust channel are both connected with the vacuum cavity through the vacuum valve, the other end of the air exhaust channel is connected with the vacuum pump, a plurality of detection parts are arranged in the vacuum cavity along the height direction, a plurality of detection units are arranged in the detection parts, and the vacuum pump, the detection units and the vacuum valve are connected with the controller;
the vacuum valve is used for driving one of the air exhaust channel and the air exhaust channel to be communicated with the vacuum cavity;
the detection part is used for placing a sample container;
the detection unit is used for detecting the position of the sample in the sample container.
2. The vacuum extractor of claim 1, wherein: the upper end of the detection part is provided with a laminate, a vertical guide rail is connected between the laminate and the inner wall of the vacuum cavity, the lower end face of the laminate is connected with the detection unit, and the vertical guide rail is connected with the controller.
3. The vacuum extractor of claim 2, wherein: the vacuum detection device is characterized by further comprising a plurality of bottom plates, the bottom plates are arranged at the lower ends of the detection portions, horizontal guide rails are connected between the bottom plates and the inner walls of the vacuum cavities, a plurality of positioning grooves are formed in the upper end faces of the bottom plates corresponding to the pressure sensors, and the horizontal guide rails are connected with the controller.
4. The vacuum extractor of claim 3 wherein: the laminate and the bottom plate are both provided with a plurality of air holes; the air hole is used for communicating any two detection parts which are adjacently arranged along the height direction of the vacuum cavity.
5. The vacuum extractor of claim 3 wherein: the central point of the positioning groove is superposed with the projection of the central point of the detection unit on the horizontal plane.
6. The vacuum extractor of claim 1, wherein: the detection unit is one of a pressure sensor and a liquid level sensor.
7. The vacuum extractor of claim 1, wherein: the closed door body is provided with a visible window.
8. A vacuum pumping method for an earth test, applied to a controller of a vacuum pumping device for an earth test according to any one of claims 1 to 7, characterized by comprising the steps of:
s1: placing a sample container filled with a sample in the detection part, driving the detection unit to extend into the sample container, and closing the closed door body;
s2: driving the vacuum valve to be in a first state, and driving the vacuum pump to pump air into the vacuum cavity through the air pumping channel, wherein the first state is that the exhaust channel is closed, and the air pumping channel is conducted;
s3: judging whether the sample floats to a preset position through the detection unit, if so, executing S4, otherwise, executing S5;
s4: closing the vacuum pump, driving the vacuum valve to be in a second state for preset time, and executing S2, wherein the second state is that the exhaust channel is communicated and the pumping channel is closed;
s5: and judging whether the vacuum degree in the current vacuum cavity is maintained in a preset threshold value for a preset time, if so, closing the vacuum pump, driving the vacuum valve to be in a second state, and if not, executing S3.
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