CN106643996B - Buoyancy balance type weighing device - Google Patents
Buoyancy balance type weighing device Download PDFInfo
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- CN106643996B CN106643996B CN201710029904.0A CN201710029904A CN106643996B CN 106643996 B CN106643996 B CN 106643996B CN 201710029904 A CN201710029904 A CN 201710029904A CN 106643996 B CN106643996 B CN 106643996B
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- weighing
- weight tray
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- buoyancy
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G1/00—Weighing apparatus involving the use of a counterweight or other counterbalancing mass
- G01G1/18—Balances involving the use of a pivoted beam, i.e. beam balances
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G5/00—Weighing apparatus wherein the balancing is effected by fluid action
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Abstract
The utility model provides a buoyancy balanced type weighing device, has solved that traditional balance or sensor range are little, the precision is low or the high scheduling problem of cost, including the liquid reserve tank, the hollow body that has the guide force pole of suspension in the liquid reserve tank, the weighing sensor that the heavy object tray and be connected through data line and measuring instrument, its technical essential is: the guide cable connected to the fixed end plate at the top of the guide rod is connected with the weight tray and the weight tray through the guide support frame and the suspension rod, the weight tray is arranged above the buffering and centering mechanism, the buffering and centering mechanism is fixed on the weighing sensor, the weight mass on the weight tray is adjusted to be preset and balanced, the gravity of a measured object is balanced with the buoyancy of the hollow floating body, and the mass of the measured object is equal to the mass sum displayed when the weight mass and the weighing sensor are transmitted to the measuring instrument. The weighing device has the advantages of reasonable structural design, large mass weighing by using a sensor with small measuring range, large measuring range, high precision, low manufacturing cost and wide application range.
Description
Technical Field
The invention relates to a weighing device, in particular to a buoyancy balanced type weighing device which is suitable for meeting the requirements of large mass or high precision. The device can also be used for the verification of large weights and the large tare weight and small weight.
Background
The weighing accuracy of a conventional balance or sensor is nominal as a percentage of full scale. The range is small due to the limitation of the bearing capacity of the beam and the knife bearing of the balance, such as the structure disclosed by the 'balance' with the publication number of CN 201476851U. Some electronic balances are limited by the measuring range and the sensitivity of the sensor, so that the precision of the balance is restricted by the measuring range, and particularly, the balance with a large measuring range is difficult to manufacture due to overhigh manufacturing cost. The requirements of large range or high precision can not be satisfied for the verification quantity transmission of large weights, large tare weight and small weighing, etc. The existing buoyancy balance structure utilizes the difference of the mass of a weighed object to balance the volume difference of the immersed liquid of a floating body, the difference of the height of the floating body floating out of the liquid level is used for calibrating the mass relation with the weighed object, and the improvement of the weighing precision is limited due to the influence of factors such as the detection of the lifting height, the surface tension of the liquid and the like. When objects with different mass sizes are measured, weighing appliances with different measuring ranges are often required to be replaced so as to ensure respective measuring precision.
According to the relevant patent report, the 'buoyancy balance' with the publication number of 85203494U discloses the core technology: the weight is balanced by the buoyancy of the cylindrical float bowl in the liquid pool. When the weighing material amount changes, the scales of the floating rod floating up and down indicate that the weighing value changes, the buoyancy and the weights effectively balance the total mass of the weighing material amount, and the change amount of the mass is measured through the lifting displacement of the floating cylinder. But the detection aim is achieved after the liquid discharge quantity is changed due to the fact that the float bowl moves up and down due to the change of the mass, and the balance is achieved. The structure limits the improvement of the measurement precision, the large surface area and the large upper and lower planes of the float bowl and the liquid viscosity limit the sensitivity of the float bowl in moving up and down, the balance time is long, the repeatability of weighing is reduced under the action of the liquid surface tension, and an adjustable balance weight is required to be added for ensuring the center of mass of a weighed object and the center cross beam of the buoyancy.
Similar to the patent, there is also a "buoyancy balance" of publication No. CN201159663Y, which utilizes the fact that the float is subjected to the action of the weighing object to displace up and down the liquid level, resulting in a change in the liquid level corresponding to the so-called mass. The structure is that a scale rod is hinged on a floating body and moves up and down along with the liquid level of the floating body. The weight of the weighed object is balanced with the buoyancy when the scale rod rotates, and the object mass is obtained by the position of the scale pointer driven by the scale rod, which corresponds to the dial. The interface of the floating block immersed in the liquid level has large change, the buoyancy is changed along with the different masses of the objects to be weighed before and after weighing, and the measurement precision is difficult to ensure. The disclosed buoyancy balance structure is also provided with a slide block for guiding and increasing additional resistance, and high precision is difficult to achieve.
Disclosure of Invention
The invention aims to provide a buoyancy balanced type weighing device, which solves the problems of small measuring range, low precision or high manufacturing cost of the traditional balance or sensor, has reasonable structural design, realizes large-mass weighing by combining a weighing weight with a sensor with small measuring range, and has the advantages of large measuring range, low manufacturing cost, high precision and wide application range.
The technical scheme adopted by the invention is as follows: this buoyancy balanced type weighing device is including fixing the liquid reserve tank on the supporting seat, and the hollow body that has the guide force pole of suspension in the liquid reserve tank, the weighing sensor that the heavy object tray and be connected through data line and measuring instrument, its technical essential is: the force guide cable connected to the fixed end plate at the top of the force guide rod is connected with the weight tray and the weight tray through the force guide support frame and the suspension rod to form a stable force guide mechanism, the buoyancy generated by the hollow floating body is guided to the lower part of the liquid storage tank, the weight tray for placing the object to be measured is hung and connected with the weight tray through a connecting shackle and is arranged above the buffering and centering mechanism, and the buffering and centering mechanism is fixed on a weighing sensor connected with a measuring instrument through a data line; when the sum of the weight of the weighing weight and the mass of the object to be measured placed on the weight tray generates downward gravity which is smaller than the buoyancy transferred by the hollow floating body, the weight tray floats to the upper limit mechanism to separate the weight tray from the buffer centering mechanism on the weighing sensor, otherwise, the weight tray or the weight tray falls to the upper limit of the lower limit lifting mechanism to slowly descend to the lower limit lifting mechanism to load the weight tray on the weighing sensor through the buffer centering mechanism.
The hollow floating body with the force guide rod assembled in the liquid storage tank is a single body or a combined body formed by connecting a plurality of single bodies.
And a limiting mechanism for limiting the floating distance of the hollow floating body in no-load is arranged between the bottom of the liquid storage tank and the force guide support frame.
The force guide rod is fixedly connected with the hollow floating body through the reinforcing ring.
The invention has the advantages and positive effects that: the invention is characterized in that a force guide cable arranged on a fixed end plate at the top of a force guide rod of a hollow floating body is connected with a weight tray and a weight tray through a force guide support frame and a suspension rod to form a stable force guide mechanism, the buoyancy generated by the hollow floating body is guided to the lower part of a liquid storage tank, the weight tray of the force guide mechanism is arranged above a buffering and centering mechanism, and the buffering and centering mechanism is fixed on a weighing sensor connected with a measuring instrument through a data line, so that the buoyancy generated by liquid in a tank to the hollow floating body can be completely transmitted to the weighing sensor by the force guide cable bypassing the liquid storage tank. Because the force guide cable and the force guide support frame bypass the liquid storage tank, only the force guide rod penetrates through the liquid surface and transfers buoyancy along the center of the hollow floating body, the displacement influence quantity of the hollow floating body before and after weighing is only restrained by micro deformation generated by the weighing sensor under different weighing conditions. The mass of the object to be weighed is mostly balanced by the fixed buoyancy generated by the hollow floating body and the weighing weight with known mass, and the formed smaller difference value is directly read by the weighing sensor, so the structure design is reasonable, the measuring range depends on the mass of the weighing weight after the buoyancy of the balance floating body, and the precision depends on the precision of the weighing weight, the division value of the weighing sensor and the sensitivity of the buoyancy of the hollow floating body. The suspension frictionless weighing has the advantages that most of the mass of the object to be weighed is replaced by the weight, and the sensor with small measuring range can be combined with the weighing weight to realize the weighing of large mass, so that the measuring range is large, the manufacturing cost is low, and the precision is high. The force guide cable structures on the two sides of the force guide support frame can balance the small-range unbalance loading of the weighed object, and self-adaptive balance is easy to realize; because the longitudinal displacement of the weighing sensor in the weighing process is extremely small (micron order), the height positions of the floating bodies before and after loading are almost unchanged, and the defects of uncertainty and long balance time caused by up-and-down floating of the floating barrel are overcome; the increased volume of the hollow floating body generates larger buoyancy, and the increased manufacturing cost is little; the spherical floating body has the smallest contact surface area with the liquid, which is beneficial to improving the sensing quantity of the floating body. Because the buoyancy generated by the floating body capable of floating freely is used for balancing the weight of the weighed material, the sensitivity is high, mechanical abrasion is avoided, and the defects that the traditional balance knife edge generates errors due to abrasion and the strength of a knife bearing is limited are avoided. Therefore, the invention solves the problems of small measuring range, low precision or high manufacturing cost of the traditional balance or sensor. The weight loading can be realized manually or automatically by an auxiliary automatic weight loading mechanism.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of an embodiment of the present invention;
fig. 2 is a top view of fig. 1.
The sequence numbers in the figures illustrate: the device comprises a fixed end plate 1, a force guide rod 2, a reinforcing ring 3, a hollow floating body 4, an upper limiting mechanism 5, a lower limiting lifting mechanism 6, a weight tray 7, a supporting seat 8, a buffering and centering mechanism 9, a weighing sensor 10, a data line 11, a measuring instrument 12, a connecting shackle 13, a weight tray 14, a suspender 15, a limiting mechanism 16, a liquid storage tank 17, a tank cover 18, a force guide support frame 19 and a force guide cable 20.
Detailed Description
The specific structure of the present invention will be described in detail with reference to FIGS. 1 to 2. The buoyancy balanced type weighing device comprises a liquid storage tank 17 fixed on a support seat 8, a hollow floating body 4 with a force guide rod 2 suspended in the liquid storage tank 17, a heavy object tray 7, a weighing sensor 10 connected with a measuring instrument 12 through a data line 11 and other parts. On the basis of the present embodiment, it is foreseen that the specifications and sizes of the supporting seat 8, the box cover 18 and the liquid storage box 17, and the specifications and numbers of the hollow floating body 4 and the force guide rod 2 can be set according to actual requirements. The hollow floating body 4 with the force guide rod 2 assembled in the liquid storage tank 17 can be a single body or a combination body formed by connecting a plurality of single bodies. When a plurality of single bodies are adopted, the force guide rods 2 of the single bodies are connected with each other into a combined body through the integral fixed end plate 1 at the top. For a large hollow floating body 4, the force guide rod 2 can be fixedly connected with the hollow floating body 4 through the reinforcing ring 3.
Wherein, the force guide rope 20 connected with the top fixed end plate 1 of the force guide rod 2 is connected with the weight tray 14 and the weight tray 7 through the force guide support frame 19 and the suspension rod 15 to form a stable force guide mechanism, and the buoyancy generated by the hollow floating body 4 is guided to the lower part of the liquid storage tank 17. The weight tray 14 and the weight tray 7 are assembled together through a connecting shackle 13, and the weight tray 7 is arranged above the buffering and centering mechanism 9. The force guide cable 20 is connected to two sides of the fixed end plate 1 at the top of the force guide rod 2, penetrates through a communication cavity of the force guide support frame 19, and realizes self-adaptive balance through weights on the weight tray 14 connected with the hanging bracket 15 fixed at the bottom of the force guide support frame 19 or a measured object placed on the weight tray 7. The buffer centering mechanism 9 is fixed to a weighing sensor 10 which is connected to a measuring device 12 via a data line 11. When the gravity generated by the sum of the mass of the weighing weight and the mass of the object to be measured placed on the weight tray 7 is smaller than the buoyancy transmitted by the hollow floating body 4, the weight tray 14 floats to the upper limiting mechanism 5, so that the weight tray 7 is separated from the buffering and centering mechanism 9 of the weighing sensor 10. On the contrary, the weight tray 14 or the weight tray 7 falls on the upper stop of the lower limit lifting mechanism 6, and then the lower limit lifting mechanism 6 is slowly descended, so that the weight tray 7 is centered and loaded on the weighing sensor 10 through the buffer centering mechanism 9.
The weight tray 14 is provided with a weighing weight to balance the buoyancy of the hollow float 4 in units of a range smaller than that of the weighing sensor 10. At this time, the amount of the weighing weight which is larger than the buoyancy is smaller than the range of the weighing sensor, and the lower limit elevating mechanism 6 is slowly lowered, so that the weighing tray 7 is loaded as a weighing initial value through the buffer centering mechanism 9 onto the weighing sensor 10 connected to the measuring instrument 12 through the data line 11, and is simultaneously recorded on the measuring instrument 12. And lifting the lower limiting lifting mechanism 6 to enable the weighing sensor 10 to be in a non-bearing state, placing a measured object on the weight tray 7, and removing weights on the weight tray 14, wherein the weights are equal to the estimated mass of the measured object, until the weight tray 14 floats to the upper limiting mechanism 5. And then a small amount of weights are loaded to enable the weighing tray 7 to fall on the lower limit lifting mechanism 6, the lower limit lifting mechanism 6 falls back, the weighing sensor 10 is reloaded through the buffer centering mechanism 9, and the mass of the object to be measured is equal to the mass of the unloaded weights plus the difference between the mass transmitted to the measuring instrument 12 by the weighing sensor 10 and the initial weighing value.
Weighing principle: the device is used for weighing, most of the mass of the object to be weighed on the weight tray 7 is offset by the buoyancy generated by the hollow floating ball 4 and the weight on the weight tray 14, and the rest mass is weighed by the weighing sensor 10.
Initial adjustment: the equivalent weight is arranged on the weight tray 14 according to the buoyancy, the full scale weight is loaded on the weight tray 14, the weighing sensor 10 senses a value smaller than the range 1/100 of the weighing sensor 10 on the measuring instrument 12, and the weight displayed by weighing is 0kg through the clear 0 function of the display.
The weighing process comprises the following steps: loading full-scale weighing weights, lifting the lower limit lifting mechanism 6, loading the object to be weighed, estimating the mass of the object to be weighed firstly during weighing, unloading large-mass weights firstly, then unloading small-mass weights until the weighing mechanism floats to the upper limit mechanism 5, then gradually loading weights with the mass smaller than the range of the weighing sensor 10, enabling the weighing mechanism to fall back to the lower limit lifting mechanism 6, wherein the resultant force at the moment is smaller than the range of the weighing sensor 10, so as to protect the weighing sensor 10 from overload; and slowly descending the lower limit lifting mechanism 6 to load the lower end face of the weight tray 7 to the weighing sensor 10 through the buffering and centering mechanism 9, directly reading the weighing value after the lower end face is stabilized, wherein the mass of the weighed object is equal to the sum of the mass of the unloading weight and the mass displayed by the weighing instrument. The weight loading can be realized manually or automatically by an auxiliary automatic weight loading mechanism.
The protection mechanism: in order to avoid the hollow floating ball 4 from touching the bottom of the liquid storage tank 17 when the hollow floating ball is excessively loaded and prevent the hollow floating ball 4 from rising too high when the load is excessively light, a limiting mechanism 16 for limiting the floating distance of the hollow floating body 4 in no-load can be arranged between the bottom of the liquid storage tank 17 and the force guide supporting frame 19, and an upper limiting mechanism 5 and a lower limiting lifting mechanism 6 are arranged on the upper end surface and the lower end surface of the weight tray 14 respectively. In order to make the loading load slow and avoid the impact overload caused by the weighing sensor 10, a buffer centering mechanism 9 is also arranged on the lower end surface of the weight tray 7 to avoid the sensor unbalance loading.
Claims (4)
1. The utility model provides a buoyancy balanced type weighing device, is including fixing the liquid reserve tank on the supporting seat, the hollow body that has the guide force pole of suspension in the liquid reserve tank, the weighing sensor that the heavy object tray and be connected through data line and measuring instrument, its characterized in that: the force guide cable connected to the fixed end plate at the top of the force guide rod is connected with the weight tray and the weight tray through the force guide support frame and the suspension rod to form a stable force guide mechanism, the buoyancy generated by the hollow floating body is guided to the lower part of the liquid storage tank, the weight tray for placing the object to be measured is hung and connected with the weight tray through a connecting shackle and is arranged above the buffering and centering mechanism, and the buffering and centering mechanism is fixed on a weighing sensor connected with a measuring instrument through a data line; when the gravity generated by the sum of the mass of the weighing weight and the mass of the measured object placed on the weight tray is smaller than the buoyancy transferred by the hollow floating body, the weight tray floats to the upper limit mechanism to separate the weight tray from the buffer centering mechanism on the weighing sensor, otherwise, the weight tray or the weight tray falls to the upper limit of the lower limit lifting mechanism to slowly descend to the lower limit lifting mechanism to load the weight tray on the weighing sensor through the buffer centering mechanism.
2. The buoyancy balanced weighing device of claim 1, wherein: the hollow floating body with the force guide rod assembled in the liquid storage tank is a single body or a combined body formed by connecting a plurality of single bodies.
3. The buoyancy balanced weighing device of claim 1, wherein: and a limiting mechanism for limiting the floating distance of the hollow floating body in no-load is arranged between the bottom of the liquid storage tank and the force guide support frame.
4. The buoyancy balanced weighing device of claim 3, wherein: the force guide rod is fixedly connected with the hollow floating body through the reinforcing ring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710029904.0A CN106643996B (en) | 2017-01-17 | 2017-01-17 | Buoyancy balance type weighing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710029904.0A CN106643996B (en) | 2017-01-17 | 2017-01-17 | Buoyancy balance type weighing device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106643996A CN106643996A (en) | 2017-05-10 |
| CN106643996B true CN106643996B (en) | 2022-04-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710029904.0A Active CN106643996B (en) | 2017-01-17 | 2017-01-17 | Buoyancy balance type weighing device |
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| CN (1) | CN106643996B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115265729B (en) * | 2020-09-30 | 2023-10-03 | 南京中科煜宸激光技术有限公司 | Fine detection balancing device for material bin weight of large-powder-amount material bin for additive manufacturing |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB648887A (en) * | 1946-03-28 | 1951-01-17 | Sadallah Ouayda | A float-balance for measuring weights or forces |
| GB623750A (en) * | 1946-07-19 | 1949-05-23 | Bror Gunnar Lange | Improvements in hydrostatic balances |
| CN85203494U (en) * | 1985-08-10 | 1986-06-18 | 中国科学院林业土壤研究所 | Buoyancy balance |
| CN201159663Y (en) * | 2008-02-03 | 2008-12-03 | 焦云飞 | Floating force meter |
| JP3149320U (en) * | 2008-09-24 | 2009-03-26 | 飛翔 三好 | Mass difference meter |
| CN201476851U (en) * | 2009-08-28 | 2010-05-19 | 郭方俐 | Balance scale |
| CN102645257A (en) * | 2011-02-22 | 2012-08-22 | 昆山市创新科技检测仪器有限公司 | Weight measuring device implemented by using buoyancy method |
| CN206378183U (en) * | 2017-01-17 | 2017-08-04 | 丹东市蓝信电器有限公司 | Buoyant equilibrium formula meausring apparatus |
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2017
- 2017-01-17 CN CN201710029904.0A patent/CN106643996B/en active Active
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| CN106643996A (en) | 2017-05-10 |
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