CN107238550B - Constant-temperature hydrostatic balance and using method thereof - Google Patents
Constant-temperature hydrostatic balance and using method thereof Download PDFInfo
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- CN107238550B CN107238550B CN201710360895.3A CN201710360895A CN107238550B CN 107238550 B CN107238550 B CN 107238550B CN 201710360895 A CN201710360895 A CN 201710360895A CN 107238550 B CN107238550 B CN 107238550B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N9/00—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity
- G01N9/02—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume
- G01N2009/022—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume of solids
- G01N2009/026—Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by measuring weight of a known volume of solids the volume being determined by amount of fluid displaced
Abstract
The invention discloses a constant-temperature hydrostatic balance which comprises a rack, wherein the rack comprises a mounting plate and support plates positioned on two sides of the lower end of the mounting plate, the balance is mounted on the mounting plate, a basket with known density is hung below the balance, a lifting plate connected to the support plates in a sliding mode in the vertical direction is arranged between the two support plates, a driving mechanism used for driving the lifting plate to move in the vertical direction is arranged on the support plates, a metering bucket is fixedly mounted on the lifting plate, an overflow bucket fixedly arranged in the metering bucket is arranged in the metering bucket, and the projection of the basket in the vertical direction is positioned in the overflow bucket. In the test process, the test error caused by splashing of water splash or hands can be avoided, so that the measured density of the test piece is more accurate.
Description
Technical Field
The invention relates to the field of concrete detection equipment, in particular to a constant-temperature hydrostatic balance and a using method thereof.
Background
In scientific research work, particularly civil engineering measurement, an electronic hydrostatic balance is an essential measuring tool for measuring the specific gravity and volume of a sample by a measuring person.
At present, when testing the density of asphalt concrete, a hydrostatic balance is generally adopted, and the hydrostatic balance comprises a balance, an overflow cylinder positioned right below the balance, a support used for erecting the balance right above the overflow cylinder, and a net basket hung at the bottom of the balance and used for loading a test piece, wherein the overflow cylinder is provided with a water inlet and a water outlet, and the net basket is not in contact with the bottom of the overflow cylinder. When the density is tested, the water level is stabilized at the bottom of the water outlet, the degree of balance is reset to zero, the test piece is placed in the net, water in the overflow cylinder is discharged through the water outlet, the mass and the volume of the water discharged from the water outlet are measured through the reading of the balance, the density of the asphalt concrete after water absorption is obtained through conversion by the Archimedes principle, and the operation is simple.
However, in actual operation, when the asphalt concrete block for testing is put into the basket, if the test piece is directly put into the basket, water splash can be caused to come out due to the impact force and gravity of the test piece and the testing precision is influenced because the basket is in water; if slowly put into the basket with the test piece with the hand, though the test piece can not hit the surface of water and lead to water to go out, the hand can immerse in the basket, leads to the excessive overflow of water, leads to the experimental data to produce great error.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the constant-temperature hydrostatic balance, so that splash splashing caused by placing a test piece is avoided in the test process, and the test precision is improved.
In order to achieve the purpose, the invention provides the following technical scheme:
the utility model provides a constant temperature hydrostatic balance, includes the frame, the frame includes the mounting panel and is located the backup pad of mounting panel lower extreme both sides, install the balance on the mounting panel, hang the basket that is equipped with known density below the balance, two be equipped with between the backup pad along the board of lifting of vertical direction sliding connection in the backup pad, be equipped with in the backup pad and be used for the drive to lift the actuating mechanism of board along the motion of vertical direction, fixed mounting has the metering tank on the board of lifting, be equipped with in the metering tank and set firmly in the overflow bucket of metering tank, the basket is located the overflow bucket along the projection of vertical direction.
By adopting the technical scheme, the weight of the net basket during drying and the weight of the net basket with the test piece are measured firstly during measurement, and the weight of the test piece is obtained; and then driving the lifting plate to move towards the net basket, so that the net basket and the test piece are completely immersed in water, and the total volume of the net basket and the test piece is obtained, thereby calculating the density of the test piece. In the process, the net basket and the test piece are slowly immersed in the overflow barrel, so that the test error caused by splashing of water splash or hands is avoided, and the measured density of the test piece is more accurate.
The invention is further provided with: two all be equipped with actuating mechanism in the backup pad, actuating mechanism includes the lifting chain, is used for driving the sprocket of lifting chain motion and links firmly the lift plate on the lifting chain link, lift plate fixed connection is in the board of lifting, two be equipped with between the actuating mechanism and be used for driving sprocket pivoted biax step motor.
By adopting the technical scheme, the double-shaft stepping motor drives the two driving mechanisms to rotate, so that the motion of the lifting chain is realized, and the motion of the lifting chain drives the lifting plate to move along the vertical direction, so that the lifting plate, the metering barrel and the overflow barrel move along the vertical direction; make the relative overflow bucket motion that the basket can be slow, in the steady flooding bucket, prevent to lead to the splash to splash because of the impact force, improve and detect the precision.
The invention is further provided with: the balance is characterized in that an installation block is fixedly arranged below the balance, a connecting block with a known volume is fixedly arranged below the installation block, a fixed block fixed in the connecting block in a rotating clamping manner is fixedly arranged on the basket, and the fixed block and the basket are coaxially arranged.
Through adopting above-mentioned technical scheme, thereby the connecting block makes the basket after installing the balance below to the fixed block, can not rock, makes the weight that the balance measured more accurate. And can prevent when submerging the basket in the overflow bucket, the basket rocks, leads to the splash to splash, increase measuring error.
The invention is further provided with: be equipped with the connecting rod between fixed block and the basket upper end outer fringe, the relative basket one end of connecting rod can be dismantled and connect in the basket, just the relative fixed block one end of connecting rod is rotated and is connected in the fixed block.
Through adopting above-mentioned technical scheme, when putting into the basket with large-scale object, separate one of them connecting rod one end and basket, then turn over. Therefore, objects with larger volume can be placed into the net basket, and the application range of the test piece for the balance is expanded. If the object is very large in size, the two connecting rods can be detached at the same time, and the connecting rods and the net basket are installed together after the object is placed in the net basket.
The invention is further provided with: the water-collecting bucket is arranged on one side of the metering bucket, a drain pipe with a drain valve is arranged between the lower end of the metering bucket and the water-collecting bucket, and a water inlet pipe with a water inlet valve is arranged between the upper end of the overflow bucket and the water-collecting bucket.
Through adopting above-mentioned technical scheme, after the measurement finishes, can take the water in the measuring bucket out to the water-collecting bucket in. When the water is measured next time, the water is put into the overflow barrel again to recycle the water, so that the water resource is saved.
The invention is further provided with: and a heating rod and a thermometer are arranged in the overflow barrel, and the heating rod and the thermometer are fixedly arranged in the metering barrel.
Through adopting above-mentioned technical scheme to the accessible heating rod heats the temperature in the overflow bucket, thereby ensures that the water in the overflow bucket has certain temperature and better mobility. Meanwhile, the water temperature is kept constant through the heating rod, so that the water temperature is kept at a stable value, and the density and the volume of the water are kept at the same value. The volume change of water caused by the change of the water temperature is reduced, the volume sum of a test piece and the net basket of water overflowing from the overflow bucket is ensured, and the precision of a test result is improved.
The invention is further provided with: the lower end of the net basket is arranged in a necking mode.
Through adopting above-mentioned technical scheme to increase the basket and move at relative overflow bucket, when submerging gradually in the overflow bucket, the pressure that the basket applyed to the surface of water, thereby reduced the basket and entered into the surface of water and the splash that rises, made the more stable precision that overflows of water, improvement test result.
The invention is further provided with: the metering barrel is higher than the overflow barrel.
Through adopting above-mentioned technical scheme, can prevent that the overflow bucket from overflowing outside the measuring tank when the overflow, ensure the accuracy of test result.
The invention is further provided with: metering tank one side is equipped with fixed mounting in the liquid level pipe that has the scale of board of lifting, be equipped with the communicating pipe of intercommunication liquid level pipe and metering tank between liquid level pipe and the metering tank, the communicating pipe both ends all are equipped with the fixed pulley, the intraductal sliding connection of liquid level has the buoy, be equipped with the floater in the metering tank, be connected with the connection rope through the fixed pulley between floater and the buoy.
By adopting the technical scheme, when the liquid level in the metering barrel rises, the floating ball rises, and the buoy falls; when the liquid level in the metering barrel descends, the floating ball descends and the buoy ascends. Therefore, the liquid amount in the measuring barrel can be clearly reflected by combining the buoy and the scales, and the volume sum of the test piece and the net basket is obtained.
Another object of the present invention is to provide a method for using a constant temperature hydrostatic balance that allows accurate measurement of specimen density.
The technical purpose is realized by the following technical scheme:
a method of use for a thermostatic hydrostatic balance comprising the steps of:
s1, knowing that the volume of the connecting block is V1The densities of the basket, the fixed block and the connecting rod are rho2(ii) a The volume sum of the net basket, the fixed block and the connecting rod is V2The sum of the mass of the basket, the fixed block and the connecting rod is M2(ii) a Let the volume of the test piece be V3Mass of specimen being M3Density of the specimen is rho3；
S2, zeroing the balance, rotationally clamping the fixing block on the connecting block, reading, and displaying the weight M of the balance2A; placing the test piece, reading, and displaying the weight M by a balance2+M3＝b；
S3, opening the water inlet valve to enable water to enter the overflow barrel, filling the overflow barrel with water, reading, heating the water to 20 ℃ by using a heating rod, maintaining the temperature at 20 ℃, adding water again until the water overflows from the overflow barrel, reading, and displaying the liquid level V on the liquid level pipeFront side；
S4, the driving piece drives the chain wheel to rotate to drive the lifting chain to move, so that the lifting plate drives the lifting plate to move upwards until the liquid level is calm, the connecting block is completely covered, the number is read, and the liquid level displayed by the liquid level tube is VRear endObtaining V1+V2+V3＝VRear end-VFront side；
S5, obtaining
The density rho of the test piece can be obtained3。
By adopting the technical scheme, the density of the test piece obtained by the method is irrelevant to the density of the liquid, so that any liquid can be used without being limited to water. Meanwhile, the step of splashing water is avoided in the process, so that the accuracy of the test result is higher.
When water enters the overflow barrel, the water temperature and primary overflow are maintained, so that the water in the overflow barrel is ensured to be in a full state before the net basket enters the overflow barrel. Namely ensuring that the volume of water overflowing from the overflow bucket is V after the net basket and the test piece enter the overflow bucket2+V3And the accuracy of the test is ensured.
The invention has the following advantages: the density accuracy of the measured test piece is higher, no water splash splashes in the operation process, and water can be recycled.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment;
FIG. 2 is a schematic structural view of a connecting block in the embodiment;
FIG. 3 is an enlarged view taken at A in FIG. 1;
FIG. 4 is a schematic structural view of a driving mechanism in the embodiment;
FIG. 5 is a partial schematic view of an embodiment (primarily for embodying a water collection bucket);
FIG. 6 is a partial schematic view of the embodiment (mainly for embodying the liquid level pipe)
In the figure: 1. a frame; 2. mounting a plate; 3. a support plate; 4. a base plate; 5. a balance; 6. mounting blocks; 7. connecting blocks; 8. mounting grooves; 9. a ring groove; 10. a through groove; 11. a fixed block; 12. a clamping block; 13. a connecting rod; 14. a basket; 15. lifting lugs; 16. mounting holes; 17. mounting a rod; 18. a lifting plate; 19. a drive mechanism; 20. a hoisting chain; 21. a sprocket; 22. a lifting plate; 23. a dual-axis stepper motor; 24. a metering bucket; 25. an overflow bucket; 26. a heating rod; 27. a thermometer; 28. a water collection barrel; 29. a drain valve; 30. a drain pipe; 31. a water inlet valve; 32. a water inlet pipe; 33. a liquid level tube; 34. a communicating pipe; 35. a bottom bar; 36. a fixed pulley; 37. a float; 38. a floating ball; 39. connecting ropes; 40. and (4) calibration.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
as shown in fig. 1, the constant-temperature hydrostatic balance comprises a frame 1, wherein the frame 1 comprises a mounting plate 2, a support plate 3 and a bottom plate 4. The mounting plate 2 is parallel to the bottom plate 4 and is located above the bottom plate 4, and the support plates 3 are provided with two blocks and are located on two sides of the mounting plate 2. The support plate 3 is perpendicular to the mounting plate 2 and is fixedly connected to the mounting plate 2 and the bottom plate 4. A balance 5 is arranged on the mounting plate 2, and the balance 5 is a tension balance 5.
As shown in figure 1, the lower end surface of the balance 5 is provided with an installation block 6 for measuring weight by force, and the installation block 6 is fixedly installed on the balance 5 and penetrates through the installation plate 2. The lower end of the mounting block 6 is fixedly provided with a connecting block 7, and the projection of the mounting block 6 along the vertical direction falls in the connecting block 7. As shown in fig. 2, a mounting groove 8 is formed in the lower end face of the connecting block 7, a ring groove 9 is formed in the inner wall of the mounting groove 8 along the circumferential direction of the mounting groove, and a through groove 10 communicated with the lower end face of the connecting block 7 is formed in the lower side wall of the ring groove 9 along the vertical direction.
As shown in fig. 1 and 3, a fixing block 11 is embedded in the mounting groove 8, and the lower end of the fixing block 11 penetrates through the mounting groove 8. The outer wall of the fixed block 11 is fixedly provided with a fixture block 12 which is embedded in the annular groove 9 and has the same width as the through groove 10. Connecting rods 13 are arranged on two sides of the lower end of the fixing block 11, the connecting rods 13 are symmetrically arranged along the center of the fixing block 11, and the lower ends of the connecting rods 13 are outwards obliquely arranged. The connecting rod 13 is rotatably connected to the fixed block 11 relative to one end of the fixed block 11.
As shown in fig. 1 and 3, a basket 14 for holding a test piece is arranged between the lower ends of the two connecting rods 13, and lifting lugs 15 are fixedly arranged on two sides of the upper end of the basket 14. The lifting lug 15 is provided with a mounting hole 16, and the mounting hole 16 is square. Connecting rod 13 has set firmly installation pole 17 relative 15 one side of lug, and installation pole 17 inlays to be contradict with mounting hole 16 and sets up in mounting hole 16. The removal of the connecting rods 13 and baskets 14 is achieved by pulling the mounting rods 17 out of the mounting holes 16. The lower end of the net basket 14 is arranged in a necking way.
As shown in fig. 2 and 3, when the basket 14 needs to be installed, the latch 12 can be aligned with the through slot 10, so that the latch 12 is inserted into the annular slot 9, the fixing block 11 is inserted into the installation slot 8, and then the fixing block 11 is rotated, so that the latch 12 leaves the through slot 10. Therefore, the net basket 14 is stably arranged under the balance 5, the weight of the net basket 14 and the total weight of the net basket 14 and the test piece are accurately measured, and the weight of the test piece is obtained.
As shown in fig. 1, a lifting plate 18 is provided below the basket 14, the lifting plate 18 being parallel to the mounting plate 2. Both sides of the lifting plate 18 are provided with driving mechanisms 19 fixedly mounted on the supporting plate 3. As shown in fig. 4, the drive mechanism 19 includes a lift chain 20, a sprocket 21, and a lift plate 22. The two chain wheels 21 are arranged at two ends of the supporting plate 3, and the chain wheels 21 are rotatably connected to the supporting plate 3. The lifting chain 20 is sleeved outside the chain wheel 21 and is in a tension state. As shown in fig. 1 and 4, the lift plate 22 is parallel to the lift plate 18 and is fixedly attached to the lift chain 20. As shown in fig. 1, the lift plate 22 is positioned below the lift plate 18 and is fixedly attached to the lift plate 18. A double-shaft stepping motor 23 is arranged between the two driving mechanisms 19, and the double-shaft stepping motor 23 is coaxially and fixedly connected with the chain wheels 21 in the two driving mechanisms 19.
As shown in fig. 1 and 4, the two-shaft stepping motor 23 drives the sprocket 21 to rotate, thereby driving the lifting chain 20 to rotate, and thus driving the lifting plate 18 to move in the vertical direction via the lifting plate 22.
As shown in fig. 1, the lifting plate 18 is fixedly provided with a measuring bucket 24, and the measuring bucket 24 and the basket 14 are coaxially arranged. An overflow barrel 25 is coaxially and fixedly arranged in the metering barrel 24, and the height of the overflow barrel 25 is smaller than that of the metering barrel 24. The basket 14 is located in the overflow bucket 25 in a vertical projection.
As shown in fig. 1, a heating rod 26 and a thermometer 27 are provided in the overflow tank 25, and the heating rod 26 and the thermometer 27 are fixedly attached to the measuring tank 24. As shown in FIG. 5, a water collecting tank 28 is provided at one side of the measuring tank 24, a water discharge pipe 30 having a water discharge valve 29 is provided between the lower end of the measuring tank 24 and the water collecting tank 28, and a water inlet pipe 32 having a water inlet valve 31 is provided between the upper end of the overflow tank 25 and the water collecting tank 28.
As shown in FIG. 6, a liquid level pipe 33 is disposed on one side of the measuring tank 24, and the liquid level pipe 33 is fixedly connected to the lifting plate 18. A communicating pipe 34 for communicating the liquid level pipe 33 and the measuring tank 24 is provided between the liquid level pipe 33 and the measuring tank 24. The inner wall of the communicating pipe 34 is fixedly provided with bottom rods 35 along the vertical direction, and the bottom rods 35 are provided with two ends and are located at two ends of the communicating pipe 34. The upper end of the bottom rod 35 is rotatably connected with a fixed pulley 36. A buoy 37 is connected in the liquid level pipe 33 in a sliding mode, a floating ball 38 is arranged in the metering barrel 24, and a connecting rope 39 is connected between the floating ball 38 and the buoy 37. The connecting rope 39 abuts on the fixed sheave 36. The liquid level pipe 33 is provided with a scale 40 for reflecting the liquid level in the measuring bucket 24.
As shown in fig. 6, when the liquid level in the measuring tank 24 rises, the float 38 rises, and the connecting rope 39 moves under the traction of the fixed pulley 36 to lower the float 37; when the liquid level in the measuring bucket 24 drops, the float 38 drops and the float 37 rises. The combination of the float 37 and the scale 40 clearly shows the amount of liquid in the measuring tank 24, and therefore the volume sum of the test piece and the basket 14 is obtained.
Example two:
a method of use for the constant temperature hydrostatic balance of embodiment one:
s1, volume of known connecting block 7 is V1The densities of the basket 14, the fixed block 11 and the connecting rod 13 are rho2(ii) a The volume sum of the net basket 14, the fixed block 11 and the connecting rod 13 is set as V2The sum of the mass of the net basket 14, the fixed block 11 and the connecting rod 13 is M2(ii) a Let the volume of the test piece be V3Mass of specimen being M3Density of the specimen is rho3；
S2, zeroing the balance 5, rotationally clamping the fixed block 11 on the connecting block 13, reading, wherein the weight displayed by the balance 5 is M2A; the test piece is put in, the reading is carried out, and the balance 5 displays the weight M2+M3＝b；
S3, opening the water inlet valve 31 to allow water to enter the overflow barrel 25, filling the overflow barrel 25 with water, reading, heating the water to 20 ℃ by using the heating rod 26, maintaining the temperature at 20 ℃, adding water again until the water overflows from the overflow barrel 25, reading, and displaying the liquid level V on the liquid level pipe 33Front side；
S4, the double-shaft stepping motor 23 drives the chain wheel 21 to rotate to drive the lifting chain 20 to move, so that the lifting plate 22 drives the lifting plate 18 to move upwards until the lifting plate 18 moves upwardsWhen the liquid level is calm, the connecting block 7 is completely covered, the reading is carried out, and the liquid level displayed by the liquid level pipe 33 is VRear endObtaining V1+V2+V3＝VRear end-VFront side；
S5, obtaining
The density rho of the test piece can be obtained3。
The specific embodiments are only for explaining the present invention, and the present invention is not limited thereto, and those skilled in the art can make modifications without inventive contribution to the present embodiments as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Claims (7)
1. The utility model provides a constant temperature hydrostatic balance, includes frame (1), frame (1) includes mounting panel (2) and backup pad (3) that are located mounting panel (2) lower extreme both sides, install balance (5) on mounting panel (2), hang basket (14) that are equipped with known density, its characterized in that below balance (5): a lifting plate (18) connected to the supporting plates (3) in a sliding mode along the vertical direction is arranged between the two supporting plates (3), a driving mechanism (19) used for driving the lifting plate (18) to move along the vertical direction is arranged on the supporting plates (3), a metering barrel (24) is fixedly installed on the lifting plate (18), an overflow barrel (25) fixedly arranged on the metering barrel (24) is arranged in the metering barrel (24), and the projection of the net basket (14) along the vertical direction is located in the overflow barrel (25); an installation block (6) is fixedly arranged below the balance (5), a connecting block (7) with a known volume is fixedly arranged below the installation block (6), a fixed block (11) which is rotationally clamped and fixed in the connecting block (7) is fixedly arranged on the basket (14), and the fixed block (11) and the basket (14) are coaxially arranged; a connecting rod (13) is arranged between the fixed block (11) and the outer edge of the upper end of the basket (14), one end of the connecting rod (13) opposite to the basket (14) is detachably connected to the basket (14), and the connecting rod (13) is rotatably connected to the fixed block (11) opposite to one end of the fixed block (11); a water collecting barrel (28) is arranged on one side of the metering barrel (24), a drain pipe (30) with a drain valve (29) is arranged between the lower end of the metering barrel (24) and the water collecting barrel (28), and a water inlet pipe (32) with a water inlet valve (31) is arranged between the upper end of the overflow barrel (25) and the water collecting barrel (28).
2. The thermostatic hydrostatic balance of claim 1, wherein: two all be equipped with actuating mechanism (19) on backup pad (3), actuating mechanism (19) including lifting chain (20), be used for driving sprocket (21) of lifting chain (20) motion and link firmly in lifting plate (22) on lifting chain (20) chain link, lifting plate (22) fixed connection is in lifting plate (18), two be equipped with between actuating mechanism (19) and be used for driving sprocket (21) pivoted biax step motor (23).
3. A thermostatic hydrostatic balance according to claim 2 wherein: a heating rod (26) and a thermometer (27) are arranged in the overflow barrel (25), and the heating rod (26) and the thermometer (27) are fixedly arranged on the metering barrel (24).
4. A thermostatic hydrostatic balance according to claim 3 wherein: the lower end of the net basket (14) is arranged in a necking mode.
5. The thermostatic hydrostatic balance of claim 1, wherein: the metering bucket (24) is higher than the overflow bucket (25).
6. The thermostatic hydrostatic balance of claim 5, wherein: metering tank (24) one side is equipped with liquid level pipe (33) that have scale (40) of fixed mounting in board (18) of lifting, be equipped with communicating pipe (34) of intercommunication liquid level pipe (33) and metering tank (24) between liquid level pipe (33) and metering tank (24), communicating pipe (34) both ends all are equipped with fixed pulley (36), sliding connection has buoy (37) in liquid level pipe (33), be equipped with floater (38) in metering tank (24), be connected with between floater (38) and buoy (37) through fixed pulley (36) connection rope (39).
7. Use of the thermostatic hydrostatic balance according to claim 6, characterized by the following steps:
s1, the volume of the known connecting block (7) is V1The densities of the basket (14), the fixed block (11) and the connecting rod (13) are rho2(ii) a The sum of the volume of the net basket (14), the fixed block (11) and the connecting rod (13) is V2The sum of the mass of the basket (14), the fixed block (11) and the connecting rod (13) is M2(ii) a Let the volume of the test piece be V3Mass of specimen being M3Density of the specimen is rho3；
S2, a zero returning balance (5), wherein the fixing block (11) is rotationally clamped on the connecting block (13) for reading, and the weight displayed by the balance (5) is M2A; the test piece is put in, the reading is carried out, and the balance (5) displays the weight M2+M3＝b；
S3, opening the water inlet valve (31) to allow water to enter the overflow barrel (25), filling the overflow barrel (25) with water, reading, heating the water to 20 ℃ by using the heating rod (26), maintaining the temperature at 20 ℃, adding water again until the water overflows from the overflow barrel (25), reading, wherein the liquid level displayed by the liquid level pipe (33) is VFront side；
S4, the double-shaft stepping motor (23) drives the chain wheel (21) to rotate to drive the lifting chain (20) to move, so that the lifting plate (22) drives the lifting plate (18) to move upwards until the liquid level is calm, the connecting block (7) is completely covered, the reading is carried out, and the liquid level displayed by the liquid level pipe (33) is VRear endObtaining V1+V2+V3＝VRear end-VFront side；
S5, obtaining
The density rho of the test piece can be obtained3。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710360895.3A CN107238550B (en) | 2017-05-20 | 2017-05-20 | Constant-temperature hydrostatic balance and using method thereof |
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| CN201710360895.3A CN107238550B (en) | 2017-05-20 | 2017-05-20 | Constant-temperature hydrostatic balance and using method thereof |
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| CN107238550A CN107238550A (en) | 2017-10-10 |
| CN107238550B true CN107238550B (en) | 2020-08-11 |
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| US3933211A (en) * | 1973-09-04 | 1976-01-20 | Mettler Instrumente Ag | Buoyancy balance |
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| CN202502029U (en) * | 2012-03-13 | 2012-10-24 | 河海大学 | Density measuring tester with sliding water tank through net basket method |
| CN205404331U (en) * | 2016-02-25 | 2016-07-27 | 中国石油化工股份有限公司 | Test device of non - foamed plastic density |
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