Liquid density detection device and detection method

Abstract

The present invention relates to the technical field of liquid density detection, and proposes a liquid density detection device and detection method, including a protective shell having a first through hole; a detection member arranged in the protective shell; an opening and closing member moving or rotating relative to the protective shell, and the opening and closing member is configured to open or close the first through hole after moving or rotating. Through the above technical solution, the problem in the prior art that the pre-stirring treatment of the slurry before detection may still damage the detection member through the through hole of the protective shell is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid density detection, and in particular to a liquid density detection device and a detection method. Background Art

[0002] At present, the buoyancy method is used to detect the density of the slurry in the slurry processing equipment. The slurry density is calculated mainly by using the relationship between the buoyancy of the object immersed in the slurry and the slurry density. However, this method is easily limited by the detection environment, that is, the detection requires high uniformity of the slurry. Therefore, before the detection, the slurry will be fully stirred to evenly disperse the solid particles in the slurry and reduce precipitation and stratification, so as to avoid unstable buoyancy due to local density differences, which will lead to large errors in the measurement results.

[0003] However, in actual production, the stirring of the slurry before detection causes the slurry to impact and affect the detection components, which may cause damage to the detection components. Even if the detection components are covered with a shell with through holes, the above situation cannot be avoided. The slurry under high-speed stirring will form strong turbulence, which may still damage the detection components through the through holes. Summary of the invention

[0004] The present invention provides a liquid density detection device and a detection method, which solves the problem in the related art that the pre-stirring treatment of the slurry before detection may still damage the detection components through the through holes of the protective shell.

[0005] The technical solution of the present invention is as follows: A liquid density detection device, comprising: A protective shell, wherein the protective shell has a first through hole; A detection member, wherein the detection member is disposed in the protective shell; An opening and closing member is movably or rotatably arranged relative to the protective shell, and the opening and closing member is configured to open or close the first through hole after moving or rotating.

[0006] As a further technical solution, the protective shell and the opening and closing piece are both cylindrical, the opening and closing piece has a second through hole, the opening and closing piece is rotatably arranged on the inner wall of the protective shell, and the opening and closing piece is configured such that after rotation, the first through hole is connected to or disconnected from the second through hole.

[0007] As a further technical solution, the number of the first through holes is several, and the detection member includes: A float body, a pressure sensor and a connecting rod, wherein the float body and the pressure sensor are both arranged in the protective shell, the two ends of the connecting rod are respectively connected to the float body and the pressure sensor, and a plurality of the first through holes are arranged along the circumference of the float body.

[0008] As a further technical solution, the opening and closing member has two baffles at one end, a gap is formed between the two baffles, the float and the pressure sensor are respectively located on both sides of the gap, the baffle has an arc-shaped through hole, and the arc-shaped through holes of the two baffles are connected to the gap, and further includes: The partition is movably arranged in the interval, and the connecting rod passes through the interval, the partition and the arc-shaped through holes of the two baffles.

[0009] As a further technical solution, the protective shell includes: A sealed cover and a disassembly cover, wherein the disassembly cover is detachably arranged at the bottom of the sealed cover, the pressure sensor is arranged in the sealed cover, the float body is arranged in the disassembly cover, the opening and closing piece is rotatably arranged on the inner wall of the disassembly cover, and the rest of the disassembly cover is adapted in shape.

[0010] As a further technical solution, the bottom of the disassembly cover has an opening, and further comprises: A blocking plate is detachably arranged at the opening.

[0011] As a further technical solution, the pressure sensors are multiple and further include: A hanging plate, wherein the hanging plate is arranged on the top of the inner wall of the closed cover, the pressure sensor is arranged at the bottom of the hanging plate, and a plurality of the pressure sensors are arranged along the circumference of the hanging plate; A fixed plate is arranged at the bottom of the hanging plate to form a fixed area with the hanging plate, the pressure sensor is located in the fixed area, and the connecting rod passes through the fixed plate.

[0012] As a further technical solution, it also includes: A support plate, wherein the support plate is disposed at the bottom of the fixed plate and forms a support area with the fixed plate. The support plate is located between the baffle plate and the fixed plate, and the connecting rod passes through the support plate; A driving member is arranged on the supporting plate and is located in the supporting area. The driving member has a driving end, and the driving end is detachably connected to the baffle.

[0013] As a further technical solution, the float body is a hollow float body and is conical, and the cross-sectional area of ​​the float body gradually increases from top to bottom.

[0014] A liquid density detection method, using the above-mentioned liquid density detection device, comprises the following steps: S1, start the driving member, rotate the opening and closing member, and the opening and closing member blocks the first through hole; S2, pre-mixing the slurry; S3, start the driving member, rotate the opening and closing member, and connect the first through hole to the second through hole; S4. Read the value of the pressure sensor Ffloat, and calculate the slurry concentration ρliquid through the formula Ffloat=ρliquid*g*Vrow.

[0015] The working principle and beneficial effects of the present invention are: 1. Improve the service life of detection components: When the slurry is stirred before detection, the first through hole can be closed by the opening and closing member to isolate the detection component in the protective shell from the slurry with strong turbulence caused by high-speed stirring, thereby preventing the detection component from being damaged by the impact of the slurry, thereby extending the service life of the detection component and reducing the equipment maintenance cost.

[0016] 2. Ensure the accuracy of detection: When the slurry is stirred evenly, the first through hole is opened by the opening and closing member, so that the detection member can stably and comprehensively contact the slurry for buoyancy detection, ensuring the uniformity of the slurry during detection, avoiding unstable buoyancy due to local density differences, and thus ensuring the accuracy of the measurement results. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0018] Figure 1 It is a structural schematic diagram of a liquid density detection device in the present invention; Figure 2 For the present invention Figure 1 Partial cross-sectional view; Figure 3 For the present invention Figure 2 Enlarged view of part A in the middle; Figure 4 It is a schematic diagram of a partial cross-sectional structure of a disassembly cover in the present invention; Figure 5 This is a diagram showing the matching of the disassembly cover and the partition in the present invention; Figure 6 For the present invention Figure 2 Enlarged view of middle part B; Figure 7 For the present invention Figure 4 Enlarged view of middle C; Figure 8 For the present invention Figure 5 Enlarged view of the middle D part; Fig. 9 This is a schematic diagram of the support plate structure in the present invention; Fig.10 It is a schematic diagram of the fixed disk structure of the present invention.

[0019] In the figure: 1. protective shell, 101. first through hole, 102. sealed cover, 103. disassembly cover, 104. opening, 2. detection member, 201. floating body, 202. pressure sensor, 203. connecting rod, 3. opening and closing member, 301. second through hole, 302. baffle, 303. interval, 304. arc-shaped through hole, 4. blocking plate, 5. hanging plate, 6. fixed plate, 7. fixed area, 8. supporting plate, 9. driving member, 901. driving end, 10. supporting area, 11. partition. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0021] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically shown, or only one of them is marked. In this article, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0022] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0023] In addition, in the description of the present application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0024] like Figure 1 As shown, it shows a liquid density detection device in one embodiment of the present disclosure, including: a protective shell 1 having a first through hole 101; a detection member 2 is arranged in the protective shell 1; an opening and closing member 3 is arranged to move or rotate relative to the protective shell 1, and the opening and closing member 3 is configured to open or close the first through hole 101 after moving or rotating.

[0025] The specific protective shell 1 is usually made of corrosion-resistant and high-strength materials, such as stainless steel or special engineering plastics, to adapt to the harsh environment of the slurry. Its shape is designed to be cylindrical, square, etc. according to the actual installation space and detection requirements, and the first through holes 101 are evenly distributed on the surface of the protective shell 1. The number and size are adjusted according to the sensitivity of the detection element 2 and the characteristics of the slurry, such as circular holes or strip holes arranged in a circle, to ensure that the slurry can fully contact the detection element 2 during detection; before detection, for the selection of the detection element 2, for example, a high-precision pressure sensor 202 or a buoyancy sensor is selected to use a pressure sensor Taking 202 as an example, its working principle is based on the Archimedes principle. When the object connected to the pressure sensor 202 is immersed in the slurry, the density of the slurry is calculated according to the value of the pressure sensor 202, that is, the buoyancy it receives. The object needs to be installed at the center position inside the protective shell 1 to ensure that it can be evenly affected by the slurry during detection. Before the detection, the object is in the protective shell 1, and the first through hole 101 is closed to avoid the impact of the stirred slurry. When the slurry is evenly stirred, the first through hole 101 is opened, and the slurry flows into the protective shell 1 and contacts the object, and the value of the pressure sensor 202 is read to calculate the density of the slurry.

[0026] A more accurate detection method is: after the device is assembled, it is first completely submerged in water for calibration. At this time, the object is subjected to its own downward gravity F1, upward buoyancy F2, and downward pressure F3 from the pressure sensor 2022. According to the action force and reaction force, the size of F3 is the detection value of the pressure sensor 2022. The static object is balanced and satisfies the formula: F2=F1+F3. F1 and F3 are known, and the value of F2 can be calculated. According to Archimedes' principle, F 浮 =ρ 液 *g*V 排 , so the calibrated V 排 , which is the volume of liquid displaced.

[0027] After calibration, it can be known that when the submersible liquid density detection device completely penetrates into the liquid, V 排 , and then put the device into the unknown liquid, read the measured value F3 of the pressure sensor 2022, and calculate F2. According to the Archimedean principle, F 浮 =ρ 液 *g*V 排 , the density value of the liquid can be calculated. Even if the density of the liquid being tested fluctuates due to some reasons, the liquid density detection device can still continuously detect the density of the unknown liquid without adjustment.

[0028] As for the opening and closing form of the opening and closing member 3, for example, the translation type or the rotation type, for the translation type, the opening and closing member 3 can be a flat plate matching the first through hole 101, and a guide rail and a driving device, such as a small electric push rod, are arranged outside or inside the protective shell 1; when the first through hole 101 needs to be closed, the electric push rod pushes the flat plate to move along the guide rail so that the flat plate covers the first through hole 101; when it needs to be opened, the electric push rod moves in the opposite direction to move the flat plate away; for the rotation type, the opening and closing member 3 can be a disk with a fan-shaped hole corresponding to the first through hole 101, the center of the disk is connected to the protective shell 1 through a rotating shaft, and a motor and a gear transmission mechanism are arranged outside or inside the protective shell 1; the motor drives the disk to rotate through the gear, and when the fan-shaped hole on the disk is aligned with the first through hole 101, the first through hole 101 is opened; when the disk rotates to make the fan-shaped hole leave the position of the first through hole 101, the first through hole 101 is closed.

[0029] In summary, when the slurry is stirred before detection, the first through hole 101 can be closed by the opening and closing member 3, so that the detection member 2 in the protective shell 1 is isolated from the slurry with strong turbulence caused by high-speed stirring, thereby preventing the detection components from being damaged by the impact of the slurry, thereby extending the service life of the detection components and reducing the equipment maintenance cost.

[0030] like Figure 1~Figure 3 As shown, in some examples, the protective shell 1 and the opening and closing member 3 are both cylindrical, the opening and closing member 3 has a second through hole 301, and the opening and closing member 3 is rotatably arranged on the inner wall of the protective shell 1. The opening and closing member 3 is configured such that after rotation, the first through hole 101 is connected to or disconnected from the second through hole 301.

[0031] The rotary opening and closing member 3 can be built into the inner wall of the protective shell 1 to reduce the influence of the slurry on the driving source of the opening and closing member 3. The protective shell 1 plays a certain protective role on it. At the same time, the translation type requires that the opening and closing members 3 are arranged for several first through holes 101 arranged in a circle, which seriously complicates the structure. The rotary opening and closing member 3 can synchronously control the connection relationship between several first through holes 101 and second through holes 301 by a slight rotation, which greatly simplifies the structure.

[0032] like Figure 2 As shown, in some examples, there are several first through holes 101, and the detection component 2 includes: the float body 201 and the pressure sensor 202 are both arranged in the protective shell 1, the two ends of the connecting rod 203 are respectively connected to the float body 201 and the pressure sensor 202, and the several first through holes 101 are arranged along the circumference of the float body 201.

[0033] The detection member 2 is in the form of a pressure sensor 202, and is composed of a float 201, a pressure sensor 202 and a connecting rod 203 connecting the two.

[0034] The float body 201 is made of a low-density, high-strength material that is resistant to slurry corrosion, such as special engineering foam plastics, resins or lightweight alloys. Its shape is usually designed to be streamlined, such as a cylinder or a sphere, to reduce resistance in the slurry and prevent suspended particles in the slurry from falling on it and affecting the value of the pressure sensor 202. In addition, the float body 201 is installed in the lower center of the protective shell 1. This arrangement allows the float body 201 to have a more obvious displacement change under the action of the buoyancy of the slurry during detection, thereby accurately transmitting buoyancy information.

[0035] The connection form of the connecting rod 203 is, for example, threaded connection or integral molding, and its material is consistent with the float body 201 to ensure that it will not loosen during the detection process. The length of the connecting rod 203 is precisely designed according to the size of the protective shell 1 and the installation position of the float body 201 and the pressure sensor 202 to ensure that the displacement of the float body 201 under the action of the buoyancy of the slurry can be accurately transmitted to the pressure sensor 202.

[0036] At the same time, a plurality of first through holes 101 are arranged around the float 201, so that the slurry can evenly contact the float 201, ensuring that the slurry force on the float 201 in all directions is consistent, thereby improving the accuracy of detection.

[0037] like Figure 2 , Figure 5 , Figure 6 , Figure 8 As shown, in some examples, the opening and closing member 3 has two baffles 302 at one end, a gap 303 is formed between the two baffles 302, the floating body 201 and the pressure sensor 202 are respectively located on both sides of the gap 303, the baffle 302 has an arc-shaped through hole 304, and the arc-shaped through holes 304 of the two baffles 302 are connected to the gap 303, and further includes: The partition 11 is movably disposed in the interval 303 , and the connecting rod 203 passes through the interval 303 , the partition 11 and the arc-shaped through holes 304 of the two baffles 302 .

[0038] By providing a baffle 302 with an arc-shaped through hole 304 and a movable partition 11, during detection, the slurry can fully contact the float body 201 through the arc-shaped through hole 304 and the interval 303, thereby ensuring the accuracy of the detection; and when the slurry is stirred, the partition 11 can be used to close the interval 303 to protect the pressure sensor 202 on one side from the impact of the slurry, thereby realizing an organic combination of accurate detection and protection functions, and at the same time, rationally utilizing the space, placing the float body 201 and the pressure sensor 202 on both sides of the interval 303 respectively, and the connecting rod 203 passing through the relevant components, so that the entire detection device can smoothly complete the detection and the rotation action of the opening and closing member 3.

[0039] Specifically, the opening and closing member 3 is higher than the two baffles 302 at one end of the float body 201 and is integrally formed with it, which can divide the area inside the protective shell 1 into two parts. The partition 11 rotates in the interval 303 through the arc-shaped through hole 304. The thickness is moderate, which can effectively block the slurry and will not hinder the movement of the connecting rod 203. The connecting rod 203 passes through the arc-shaped through hole 304, the partition 11 and the arc-shaped through hole 304 in sequence to complete the connection with the float body 201. At the same time, the sealing of the connection can be ensured by means of sealing gaskets, etc., to prevent slurry leakage from affecting the detection accuracy and equipment life.

[0040] During the operation, since the detection member 2 as a whole does not move relative to the protective shell 1, but the opening and closing member 3 on the inner wall can rotate relative to the protective shell 1, the opening and closing member 3 will drive the partition 11 to rotate a certain angle in the interval 303 after rotating under the drive of external force, and the other parts are stationary.

[0041] like Figure 2~Figure 8 As shown, in some examples, the protective shell 1 includes: a disassembly cover 103 detachably arranged at the bottom of the sealed cover 102, a pressure sensor 202 arranged in the sealed cover 102, a float body 201 arranged in the disassembly cover 103, an opening and closing piece 3 rotatably arranged on the inner wall of the disassembly cover 103, and the rest of the disassembly cover 103 is adapted in shape.

[0042] The protective shell 1 is designed as a closed cover 102 and a detachable disassembly cover 103, so that when the equipment fails or needs regular maintenance, the disassembly cover 103 can be quickly separated to directly inspect, repair or replace the internal detection components; in particular, for the float body 201 located in the disassembly cover 103, since it is in direct contact with the slurry and is more susceptible to wear or corrosion, the detachable design can significantly improve the maintenance efficiency.

[0043] For example, an external thread is provided at the bottom of the closed cover 102, and a matching internal thread is provided at the top of the disassembly cover 103. During installation, the disassembly cover 103 is screwed onto the closed cover 102. During the rotation process, the tight fit of the thread can ensure the sealing of the connection and prevent the leakage of slurry. During disassembly, the disassembly cover 103 can be easily separated by rotating it in the opposite direction. For another example, a plurality of buckles are evenly distributed on the bottom edge of the closed cover 102, and a slot is provided at the corresponding position on the top of the disassembly cover 103. During installation, the disassembly cover 103 is aligned with the closed cover 102, and the buckle is pressed to snap into the slot to complete the quick installation.

[0044] like Figure 4 As shown, in some examples, the disassembly cover 103 has an opening 104 at the bottom, and further includes: a blocking plate 4 is detachably disposed at the opening 104 .

[0045] An opening 104 and a detachable plugging plate 4 are provided at the bottom of the disassembly cover 103 to facilitate the early installation. After the cylindrical sealed cover 102 and the disassembly cover 103 are installed, the various components of the detection member 2 are installed inward in turn. At the same time, the connecting rod 203 is not connected to the floating body 201 first. It is necessary to install the opening and closing member 3 therein first, and the connecting rod 203 passes through the partition plate 11 and other components, and then the connecting rod 203 and the floating body 201 are installed. Finally, the entire protective shell 1 is sealed by the plugging plate 4 to complete the assembly of the detection device. Under certain special detection requirements, the plugging plate 4 can be opened to adjust the amount of slurry in the disassembly cover 103 or add auxiliary detection reagents, etc., to provide more flexibility and operability for the detection process.

[0046] Specifically, a threaded hole is set at the edge of the opening 104, and a through hole is set at the corresponding position on the blocking plate 4. During installation, the blocking plate 4 is covered on the opening 104, and bolts are passed through the through holes of the blocking plate 4 and screwed into the threaded holes. The blocking plate 4 can be fixed by tightening the bolts; or a magnetic blocking plate 4 can be directly adsorbed on the opening 104, and a small handle is welded at the bottom for easy disassembly.

[0047] like Figure 9~Figure 10 As shown, in some examples, there are several pressure sensors 202, and also include: a hanging plate 5 is arranged on the top of the inner wall of the closed cover 102, the pressure sensor 202 is arranged at the bottom of the hanging plate 5, and several pressure sensors 202 are arranged along the circumference of the hanging plate 5; a fixed plate 6 is arranged at the bottom of the hanging plate 5, and a fixed area 7 is formed between the hanging plate 5 and the hanging plate 5, the pressure sensor 202 is located in the fixed area 7, and the connecting rod 203 passes through the fixed plate 6.

[0048] Specifically, a plurality of pressure sensors 202 are quickly installed through the hanging plate 5, three long nuts are provided at the top of the inner part of the sealed cover 102, bolts are used to pass through the three through holes near the center of the hanging plate 5, and the hanging plate 5 is fixed to the top of the sealed cover 102; further, the hanging plate 5 is provided with three through holes near the periphery, the bolt structure of the pressure sensor 202 is passed through the through holes, and the nut is tightened on the other side of the hanging plate 5, and so on, and each pressure sensor 202 is fixed.

[0049] When installing the detection device, the hanging plate 5 provides a stable fulcrum for the entire device and the pressure sensor 202. By hooking the hanging plate 5 with the lifting equipment, the detection device can be easily installed in the specified position. The installation process is more convenient and there is no need to fix the pressure sensor 202 separately in a narrow space.

[0050] Furthermore, a fixing plate 6 is provided at the upper end of the float body 201, which is in the shape of a hexagonal plum blossom and has three through holes on the outer ring. The bolt structure under each pressure sensor 202 is passed through the through hole, that is, the connecting rod 203 passes through the fixing plate 6 to complete the connection, thereby clamping the pressure sensor 202 in the fixing area 7 composed of the hanging plate 5 and the fixing plate 6 below it, thereby improving the stability of the lighter pressure sensor 202 and avoiding the influence of the slurry on it.

[0051] like Figure 9~Figure 10 As shown, in some examples, it also includes: the support plate 8 is arranged at the bottom of the fixed plate 6, forming a support area 10 between the support plate 8 and the fixed plate 6, the support plate 8 is located between the baffle 302 and the fixed plate 6, and the connecting rod 203 passes through the support plate 8; the driving member 9 is arranged on the support plate 8, located in the support area 10, and the driving member 9 has a driving end 901, and the driving end 901 is detachably connected to the baffle 302.

[0052] The driving member 9 is arranged on the support plate 8, and is detachably connected to the baffle 302 through its driving end 901, which can provide stable and precise power for the rotation of the baffle 302. It is arranged on the same side of the pressure sensor 202, and also avoids the influence of the slurry. At the same time, the supporting area 10 formed between the supporting plate 8 and the fixed plate 6 provides a relatively independent installation and maintenance space for the driving member 9, which is convenient for the staff to operate and reduces the difficulty and cost of equipment maintenance.

[0053] like Figure 2 , Fig. 9 As shown, in some examples, the float body 201 is a hollow float body 201 and is conical, and the cross-sectional area of ​​the float body 201 gradually increases from top to bottom.

[0054] Since the cross-sectional area of ​​the conical float body 201 gradually increases from top to bottom, that is, the side wall of the float body 201 is an inclined surface, even if suspended particles fall on the float body 201, they will slide down along the side wall and will not remain on the float body 201 to affect the buoyancy detection value; the hollow design reduces weight and is convenient for production and installation.

[0055] A liquid density detection method, using the above-mentioned liquid density detection device, comprises the following steps: S1, start the driving member 9, rotate the opening and closing member 3, and the opening and closing member 3 blocks the first through hole 101; S2, pre-mixing the slurry; S3, start the driving member 9, rotate the opening and closing member 3, and the first through hole 101 is connected to the second through hole 301; S4. Read the value Ffloat of the pressure sensor 202, and calculate the slurry concentration ρliquid by the formula Ffloat=ρliquid*g*Vrow.

[0056] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A liquid density detection device, characterized in that: include: A protective shell (1), the protective shell (1) having a first through hole (101); A detection component (2), the detection component (2) being arranged in the protective shell (1); An opening and closing member (3), the opening and closing member (3) being arranged to move or rotate relative to the protective shell (1), and the opening and closing member (3) being configured to open or close the first through hole (101) after moving or rotating.

2. A liquid density detection device according to claim 1, characterized in that: The protective shell (1) and the opening and closing member (3) are both cylindrical, the opening and closing member (3) having a second through hole (301), the opening and closing member (3) being rotatably arranged on the inner wall of the protective shell (1), the opening and closing member (3) being configured such that, after rotation, the first through hole (101) is connected to or disconnected from the second through hole (301).

3. A liquid density detection device according to claim 2, characterized in that: There are a plurality of first through holes (101), and the detection element (2) comprises: A floating body (201), a pressure sensor (202) and a connecting rod (203), wherein the floating body (201) and the pressure sensor (202) are both arranged in the protective shell (1), two ends of the connecting rod (203) are respectively connected to the floating body (201) and the pressure sensor (202), and a plurality of the first through holes (101) are arranged along the circumference of the floating body (201).

4. A liquid density detection device according to claim 3, characterized in that: The opening and closing member (3) has two baffles (302) at one end, a gap (303) is formed between the two baffles (302), the floating body (201) and the pressure sensor (202) are respectively located on both sides of the gap (303), the baffle (302) has an arc-shaped through hole (304), and the arc-shaped through holes (304) of the two baffles (302) are both connected to the gap (303), and further comprises: A partition (11), the partition (11) being movably disposed in the interval (303), and the connecting rod (203) penetrating the interval (303), the partition (11) and the arc-shaped through holes (304) of the two baffles (302).

5. A liquid density detection device according to claim 4, characterized in that: The protective shell (1) comprises: A sealed cover (102) and a disassembly cover (103), wherein the disassembly cover (103) is detachably arranged at the bottom of the sealed cover (102), the pressure sensor (202) is arranged in the sealed cover (102), the float (201) is arranged in the disassembly cover (103), the opening and closing member (3) is rotatably arranged on the inner wall of the disassembly cover (103), and the rest of the disassembly cover (103) is adapted in shape.

6. A liquid density detection device according to claim 5, characterized in that: The disassembly cover (103) has an opening (104) at the bottom, and further comprises: A blocking plate (4), wherein the blocking plate (4) is detachably arranged at the opening (104).

7. A liquid density detection device according to claim 5, characterized in that: The pressure sensors (202) are multiple in number and further include: A hanging plate (5), the hanging plate (5) being arranged on the top of the inner wall of the closed cover (102), the pressure sensor (202) being arranged at the bottom of the hanging plate (5), and a plurality of the pressure sensors (202) being arranged along the circumference of the hanging plate (5); A fixed plate (6), the fixed plate (6) being arranged at the bottom of the hanging plate (5) and forming a fixed area (7) between the fixed plate and the hanging plate (5), the pressure sensor (202) being located in the fixed area (7), and the connecting rod (203) passing through the fixed plate (6).

8. A liquid density detection device according to claim 7, characterized in that: Also includes: a support plate (8), the support plate (8) being arranged at the bottom of the fixed plate (6) and forming a support area (10) between the support plate (8) and the fixed plate (6); the support plate (8) being located between the baffle plate (302) and the fixed plate (6), and the connecting rod (203) passing through the support plate (8); A driving member (9), the driving member (9) being arranged on the supporting plate (8) and located in the supporting area (10), the driving member (9) having a driving end (901), the driving end (901) being detachably connected to the baffle (302).

9. A liquid density detection device according to claim 8, characterized in that: The float body (201) is a hollow float body (201) and is conical, and the cross-sectional area of ​​the float body (201) gradually increases from top to bottom.

10. A method for detecting liquid density, using a liquid density detection device according to claims 1 to 9, characterized in that: The following steps are involved: S1, starting the driving member (9) to rotate the opening and closing member (3), so that the opening and closing member (3) blocks the first through hole (101); S2, pre-mixing the slurry; S3, starting the driving member (9), rotating the opening and closing member (3), and connecting the first through hole (101) to the second through hole (301); S4. Read the value Ffloat of the pressure sensor (202), and calculate the slurry concentration ρliquid by the formula Ffloat=ρliquid*g*Vrow.

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