Dual weighing volumetric and density measurement device

Abstract

The application provides a double-weighing volume and density measuring device, which realizes double-weighing volume and density measurement in a single air fluid, and comprises a sealed cabin and a loading device, the sealed cabin is communicated with a vacuum pump through a pipeline, the loading device comprises a feeding unit, a feeding unit and a weighing unit, the feeding unit comprises a work station disc and a rotary driving mechanism for driving the rotation of the work station disc, the work station disc is arranged in the sealed cabin, and the power source of the rotary driving mechanism is arranged outside the sealed cabin, the feeding unit is used for transferring the weight between the feeding unit and the weighing unit, the feeding unit comprises a gripper, a sliding frame, a sliding mechanism and a lifting mechanism, the sliding frame is arranged in the sealed cabin, the gripper is slidingly connected to the sliding frame, the sliding mechanism is used for driving the sliding frame to approach or move away from the work station disc, and the lifting mechanism is used for driving the lifting movement of the gripper, and the power sources of the sliding mechanism and the lifting mechanism are arranged outside the sealed cabin; the weighing unit is used for weighing the mass of the weight.

Description

Technical Field

[0001] This invention relates to the field of metrology, and more particularly to a dual-weighing volume and density measuring device. Background Technology

[0002] The main methods for measuring the volume of weights include hydrostatic measurement and acoustic volume measurement.

[0003] The hydrostatic method is currently the most accurate and technologically mature technique for measuring the volume and density of weights internationally. However, this method still has the following technical drawbacks: air bubbles on the surface of the weights are difficult to completely eliminate during measurement, affecting the accuracy of volume and density measurements; liquid residue easily remains on the surface of the weights, affecting the mass stability of the weights and further impacting the accuracy of the weight mass measurement. To avoid the influence of turbulence and tumbling within the liquid on the measurement results, the weights need to be left to stand in the liquid for several hours to ensure stable measurement. This inevitably causes corrosion of the weight surface by the liquid and also makes the measurement time excessively long. In addition, the hydrostatic method is only suitable for solid weights without adjustment cavities and cannot be used to measure the volume and density of hollow weights with adjustment cavities or solid materials with voids.

[0004] While acoustic volumetric measurement avoids the introduction of weights into water and overcomes the technical limitations of the hydrostatic method in terms of the influence of liquid on the weights and measurement results, it also has the following technical drawbacks: Although acoustic volumetric measurement achieves a smaller measurement uncertainty, it is still greater than that of the hydrostatic method and cannot replace it; acoustic volumetric measurement is only suitable for weights whose volume, shape, and surface area are similar to the reference weight, i.e., the relative volume change between the two is between 0.95 and 1.05 times. Otherwise, the non-negligible correction factor will affect the accuracy of the volumetric measurement results. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention aims to provide a dual-weighing volume and density measuring device that measures the volume and density of weights in a single air fluid using a dual-weighing method. This solves a series of problems caused by the introduction of weights into water in the hydrostatic volume measurement method. Compared with the acoustic volume measurement method, it has lower measurement uncertainty and higher stability and accuracy of measurement results.

[0006] To achieve the above objectives, the present invention provides a dual-weighing volume and density measuring device, comprising:

[0007] Sealed chamber and loading device;

[0008] The sealed chamber is connected to a vacuum pump via a pipe, and the air pressure value of the sealed chamber is in the range of 500 hPa to atmospheric pressure.

[0009] The loading device includes a feeding unit, a conveying unit, and a weighing unit;

[0010] The feeding unit includes a workstation tray and a rotary drive mechanism for driving the workstation tray to rotate. The workstation tray is rotatably connected to the sealed chamber. Multiple first positioning mechanisms are fixedly connected to the workstation tray. Each first positioning mechanism has multiple stepped portions. Each stepped portion includes multiple steps that are staggered in the height direction and multiple supporting weights that cooperate with each other.

[0011] The feeding unit is used to transfer the weight between the feeding unit and the weighing unit. The feeding unit includes a gripper, a sliding frame, a sliding mechanism and a lifting mechanism. The sliding frame is set in the sealed chamber. The gripper is slidably connected to the sliding frame. The sliding mechanism is used to drive the sliding frame to move closer to or away from the workstation plate. The lifting mechanism is used to drive the gripper to move up and down.

[0012] The weighing unit is located inside the sealed chamber and is used to weigh the weights.

[0013] The power sources for the rotary drive mechanism, sliding mechanism, and lifting mechanism are all located outside the sealed chamber, and the rotary drive mechanism, sliding mechanism, and lifting mechanism are sealed to the sealed chamber.

[0014] In some embodiments, the rotary drive mechanism includes a rotary motor located outside the sealed chamber and connected to the workstation plate via a transmission assembly to drive the workstation plate to rotate. The transmission assembly is sealed to the sealed chamber.

[0015] In some embodiments, the transmission assembly includes multiple transmission shafts connected by gear transmission, with the two transmission shafts at both ends respectively connected to the output shaft of the rotary motor and the workstation plate.

[0016] In some embodiments, the first positioning mechanism includes a base and a plurality of positioning elements. The base includes a support shaft and a plurality of support seats. The support shaft is fixedly connected to the outer side of the axis of the workstation plate. The plurality of support seats are spaced apart and arranged around the outer periphery of the top of the support shaft. The plurality of positioning elements are connected one-to-one to the plurality of support seats. The positioning elements have stepped portions.

[0017] In some embodiments, the feeding unit includes a second positioning mechanism, which includes a mounting frame, a positioning sleeve, and a positioning cylinder. The mounting frame is fixed inside the sealed chamber, and the positioning cylinder is fixed on the mounting frame. The positioning cylinder is used to drive the positioning sleeve to move up and down. The positioning sleeve is located directly above the workstation plate. The lower end of the positioning sleeve has a conical cavity. The horizontal cross-sectional area of ​​the conical cavity gradually decreases in the direction that moves away from the workstation plate. After the workstation plate rotates a predetermined angle, the positioning sleeve can cooperate with the positioning component so that the center line of the weight on the positioning component is on the same straight line as the center line of the conical cavity.

[0018] In some embodiments, the feeding unit includes a limiting mechanism, which includes a limiting frame, a limiting cylinder, and a limiting rod. The limiting frame is fixed inside the sealed chamber, and the limiting cylinder is fixed on the limiting frame. The limiting cylinder is used to drive the limiting rod to move in a horizontal direction. The outer periphery of the workstation is provided with multiple limiting holes. After the workstation rotates by a predetermined angle, the limiting cylinder can drive the limiting rod to extend into one of the limiting holes on the workstation.

[0019] In some embodiments, the sliding mechanism includes a transverse feed motor, transverse guide rails, and a lead screw. The two transverse guide rails are parallel and spaced apart. The lead screw extends along the length of the sliding frame and is partially located outside the sealed chamber. The two ends of the sliding frame are slidably engaged with the two transverse guide rails, and the middle part of the sliding frame is screwed to the lead screw through a nut seat. The transverse feed motor is located outside the sealed chamber, and its output shaft is driven by the lead screw.

[0020] In some embodiments, the lifting mechanism includes a lifting motor, a rotating shaft, and a lifting assembly. The lifting assembly includes a slide rail, a slide base, and a lifting transmission structure. The gripper is slidably connected to the sliding frame via the slide rail and the slide base. The lifting transmission structure includes a lower sprocket, an upper sprocket, and a toothed belt. The lower sprocket and the upper sprocket are both rotatably connected to the sliding frame and are rotatably connected via the toothed belt. One end of the gripper is fixedly connected to the toothed belt. The lower sprocket is connected to the lifting motor via the rotating shaft and is driven to rotate by the lifting motor.

[0021] In some embodiments, the gripper includes a gripper base and a chuck. The gripper base is slidably connected to the sliding frame, and the chuck is fixedly connected to the side of the gripper base near the workstation. The chuck has a plate-like structure with an arc-shaped notch at one end away from the gripper base. Multiple support parts are provided at the notch, extending from the inner wall of the notch towards the center of the notch. The multiple support parts are distributed at intervals around the center of the notch.

[0022] In some embodiments, the sealed chamber includes an upper chamber and a lower chamber, which cooperate to form a sealed chamber capable of accommodating a loading device. The upper chamber is connected to a lifting mechanism and can move up and down relative to the lower chamber. Compared with the prior art, the present invention provides the following advantages:

[0023] The dual-weighing volume and density measuring device proposed in this invention has a compact structure, occupies little space, and requires no impact loading. It can measure volume and density in a single air fluid using a dual-weighing method through sealed pressure reduction technology. This solves a series of problems caused by the introduction of weights into water in the hydrostatic volume measurement method. The measurement results are highly accurate and can achieve integrated and efficient measurement of weight mass, volume, and density. It can also measure the volume of solid materials with complex dimensions and the porosity of porous materials. This provides a new approach for tracing the values ​​of weight volume and density, volume of solid materials with complex shapes, and porosity of porous materials, and has broad application prospects. Attached Figure Description

[0024] The preferred embodiments will now be described in a clear and easy-to-understand manner, in conjunction with the accompanying drawings, to further explain the above-mentioned characteristics, technical features, advantages, and implementation methods of the present invention.

[0025] Figure 1 This is an overall schematic diagram of the dual weighing volume and density measuring device proposed in this invention.

[0026] Figure 2 yes Figure 1 A schematic diagram of the explosion structure.

[0027] Figure 3 yes Figure 2 A schematic diagram of the loading device from one perspective.

[0028] Figure 4 yes Figure 3 A partial structural diagram of the feeding unit.

[0029] Figure 5 yes Figure 4 A schematic diagram of the first positioning structure.

[0030] Figure 6 and Figure 7 These are structural schematic diagrams of the loading device from different perspectives.

[0031] Figure 8 yes Figure 6 A schematic diagram of the lifting mechanism.

[0032] Figure 9 yes Figure 4 A schematic diagram of the second positioning structure.

[0033] Figure 10 yes Figure 3 A schematic diagram of the power section of the feeding unit.

[0034] Figure 11 yes Figure 3 Enlarged view of the structure of the part where the weighing unit is located.

[0035] Figure 12 yes Figure 3 A schematic diagram of the structure of the gripper.

[0036] Explanation of icon numbers:

[0037] Sealed compartment 1; Upper compartment 12; Operating window 111; Lower compartment 11; Transparent observation window 121;

[0038] Feeding unit 2; workstation plate 21; limiting hole 211; first positioning mechanism 22; support shaft 221; support base 222; positioning component 223; stepped part 2231; second positioning mechanism 23; mounting bracket 231, positioning sleeve 232; conical cavity 2321; positioning cylinder 233; limiting mechanism 24; limiting frame 241; limiting cylinder 242; limiting rod 243; rotary motor 251; first drive shaft 252; second drive shaft 253; third drive shaft 254; fourth drive shaft 255; rotating column 256;

[0039] Weighing unit 3; weighing pan 31; support column 321; support plate 322;

[0040] Feeding unit 4; lifting mechanism 41; sliding mechanism 42; sliding frame 43; gripper 44; lifting motor 411; rotating shaft 412; sprocket bracket 413; slide rail 414; lower sprocket 415, upper sprocket 416; toothed belt 417; slide block 418; transverse feed motor 421; lead screw 422; gripper seat 441; chuck 442; support part 4421. Detailed Implementation

[0041] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0042] To keep the drawings concise, each figure only schematically shows the parts relevant to the invention, and these do not represent the actual structure of the product. Furthermore, to facilitate understanding, in some figures, only one of components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0043] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0044] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0046] This invention provides a dual-weighing volume and density measuring device. Based on the principle of hydrostatic buoyancy measurement, it achieves dual-weighing volume and density measurement in a single air fluid. By constructing a dual-weighing volume and density measurement model with thermal expansion error correction, the volume and density of the weight can be obtained. The device includes a sealed chamber 1 and a loading device.

[0047] See the attached instruction manual. Figure 1 and Figure 2 The loading device includes a feeding unit 2, a feeding unit 4, and a weighing unit 3. The feeding unit 2 supplies weights to the feeding unit 4, the feeding unit 4 transfers the weights between the feeding unit 2 and the weighing unit 3, and the weighing unit 3 weighs the weights. The power source of the feeding unit 2 and the feeding unit 4 is located outside the sealed chamber 1 and is sealed to the sealed chamber 1 to maintain stable temperature, humidity, and pressure inside the sealed chamber 1.

[0048] In this embodiment, the sealed chamber 1 includes an upper chamber 12 and a lower chamber 11, which cooperate to form a sealed chamber capable of accommodating the loading device. The sealed chamber employs sealing and depressurization technology, such as by configuring a VT4.8 vacuum pump, which allows the air pressure inside the sealed chamber to be adjustable within the range of 500 hPa to atmospheric pressure, thereby creating an environmental medium with two air densities within the highly airtight sealed chamber to achieve a dual-density variation range in a single air fluid.

[0049] The upper chamber 12 and lower chamber 11 can be made of SS304 stainless steel, giving the sealed chamber 1 excellent overall performance in terms of corrosion resistance and formability. The upper chamber 12 can be raised and lowered relative to the lower chamber 11 via a lifting mechanism. When the lifting mechanism moves upward, the lower chamber 11 is fully open to facilitate equipment installation and other operations. When the lifting mechanism moves downward and docks with the lower chamber 11, a completely sealed chamber is formed, providing a good sealing environment for the measurement of the weight's volume and density.

[0050] The lifting mechanism is used to drive the upper compartment 12 to move relative to the lower compartment 11 in the height direction. The specific structure of the lifting mechanism is not the innovation of this embodiment; it only needs to achieve the function of clamping the upper compartment 12 and be able to drive the upper compartment 12 to move in the height direction. The relevant structure can be referred to the clamping mechanism disclosed in the invention patent application number 2020107396151. It can be understood that the lifting mechanism should have clamping arms that match the curved shape of the upper compartment 12. By driving the two clamping arms to open, close, or adjust the opening, the purpose of clamping the upper compartment 12 can be achieved.

[0051] In this embodiment, the connecting pipe between the sealed chamber and the vacuum pump should be airtight. In a pressure test of not less than 3 bar and not less than 10 minutes, the leakage rate should be less than 5 Pa / min, and the pressure change in the sealed chamber should not be greater than 0.6 hPa / 4h.

[0052] In this embodiment, a transparent observation window 121 is provided on the upper chamber 12. During testing, the transparent observation window 121 remains closed. The testing personnel can observe the measurement data of the weighing unit 3, as well as the conveying or transfer of weights by the feeding unit 2 and the delivery unit 4, through the transparent observation window 121. It is understood that the shape and size of the transparent observation window 121 are not particularly limited in this embodiment and can be adapted to the operating environment and the user, such as using a circular glass observation window with a diameter of 760mm. The transparent observation window 121 is preferably arranged near the feeding unit 2. When weighing begins or ends, the testing personnel do not need to detach the upper chamber 12 from the lower chamber 11; they can simply open the transparent observation window 121 to manually change the weights on the workstation 21 of the feeding unit 2.

[0053] In this embodiment, an operation window 111 is provided on the lower chamber 11. During testing, the operation window 111 remains closed. The weighing unit 3 includes a comparator. At the start or end of weighing, the testing personnel can directly open the operation window 111 to manually replace the weighing weights of the comparator. It is understood that the shape and size of the operation window 111 are not specifically limited in this embodiment and can be adapted to the operating environment and the user, such as using a rectangular operation window 111 with a length of 240mm and a height of 140mm.

[0054] By opening a transparent observation window 121 on the upper chamber 12 and an operation window 111 on the lower chamber 11, on the one hand, measurement efficiency can be effectively improved because there is no need to frequently detach the upper chamber 12 and the lower chamber 11; on the other hand, because the transparent observation window 121 and the operation window 111 have small structural dimensions, the amount of gas exchange between the inside and outside of the chamber is small when the window is opened, which is conducive to maintaining the temperature, humidity and air pressure in the sealed chamber quickly and constantly.

[0055] See the attached instruction manual. Figure 4 The feeding unit 2 includes a workstation plate 21 and a rotary drive mechanism for driving the workstation plate 21 to rotate.

[0056] The workstation tray 21 is used to support the vertical weights and drive them to rotate. It can be understood that "vertical weights" means the weights are placed vertically on the feeding unit 2; when the weights are cylindrical, "vertical" means the axis of the weights extends vertically.

[0057] The workstation plate 21 is located inside the sealed chamber 1 near the transparent observation window 121 to facilitate the replacement of weights on the workstation plate 21 by the inspection personnel. The workstation plate 21 can rotate relative to the sealed chamber 1 along its own vertical axis. The cross-section of the workstation plate 21 is approximately circular, and its rotation is driven by a rotary drive mechanism.

[0058] See the attached instruction manual. Figure 10 In this embodiment, the rotary drive mechanism includes a rotary motor 251, a transmission assembly, and a rotating column 256. The workstation disk 21 is rotatably connected inside the lower chamber 11, and the rotating column 256 is fixedly connected to the top of the workstation disk 21. The rotary motor 251 is located outside the sealed chamber 1 and is driven by the rotating column 256 through the transmission assembly, enabling the rotating column 256 to drive the workstation disk 21 to rotate relative to the sealed chamber 1 along the vertical axis.

[0059] The transmission assembly includes multiple transmission shafts connected by gears. In this embodiment, the transmission assembly includes four transmission shafts, which are defined as first transmission shaft 252, second transmission shaft 253, third transmission shaft 254, and fourth transmission shaft 255 for ease of description. The axis of the first transmission shaft 252 extends horizontally and is connected to the output shaft of the rotary motor 251. The axis of the second transmission shaft 253 extends vertically and is connected to the first transmission shaft 252 via two meshing gears. The third transmission shaft 254 is located above the second transmission shaft 253, and its axis extends horizontally. It is connected to the second transmission shaft 253 via two meshing gears. The fourth transmission shaft 255 is located below the third transmission shaft 254, and its axis extends vertically. It is connected to the third transmission shaft 254 via two meshing gears. One end of the fourth transmission shaft 255 is also fixedly connected to the rotating column 256.

[0060] Thus, the rotary motor 251 can drive the rotating column 256 to rotate through the above four transmission shafts, causing the rotating column 256 to drive the workstation disk 21 to rotate along the vertical axis. It is understood that the transmission assembly may also include more or fewer transmission shafts, as long as it can drive the workstation disk 21 to rotate without interfering with other components in the sealed chamber 1. This application does not impose any special limitations on the structure of the transmission assembly.

[0061] See the attached instruction manual. Figure 3 and Figure 4 The workstation tray 21 supplies weights to the feeding unit 4. To improve feeding efficiency, multiple first positioning mechanisms 22 are provided on the workstation tray 21. These first positioning mechanisms 22 are used for preliminary positioning of the weights. Because multiple first positioning mechanisms 22 are provided on the workstation tray 21, multiple rotating workstations are formed on the workstation tray 21. Through the preliminary positioning of the weights to be placed on the workstation tray 21 by the first positioning mechanisms 22, the testing personnel can roughly place the weights on the predetermined rotating workstations so that the feeding unit 4 can transfer the weights, ensuring a stable measurement process.

[0062] See the attached instruction manual. Figure 5 The first positioning mechanism 22 includes a base and multiple positioning components 223.

[0063] The base is fixedly connected to the workstation plate 21. The base includes a support shaft 221 and multiple support seats 222. The support shaft 221 is generally columnar in shape, with its axis extending vertically and located outside the axis of the workstation plate 21. The support seats 222 are plate-shaped, and multiple support seats 222 are spaced around the outer periphery of the top of the support shaft 221.

[0064] Multiple positioning elements 223 are connected to multiple support bases 222 in a one-to-one correspondence. Each positioning element 223 has multiple stepped portions 2231, which are stepped structures. The stepped portions 2231 on the multiple positioning elements 223 cooperate with each other to support the weight.

[0065] The positioning principle of the first positioning mechanism 22 is as follows: The step portion 2231 has multiple steps that are staggered in the height direction. By placing a weight on a step of the step portion 2231 that matches it, the weight can be contained within the area enclosed by the step portion 2231. Since the step portion 2231 surrounds the support shaft 221, the center line of the weight placed on the step portion 2231 is basically coincident with the axis of the support shaft 221, thereby achieving the initial positioning of the weight.

[0066] In this embodiment, the step-shaped structure of the positioning member 223 provides multiple steps that are staggered in the height direction. Different sizes of weights are placed on the steps at different positions, making the positioning member suitable for the initial positioning of weights of different sizes, and convenient and flexible to use.

[0067] See Appendix 6 of the instruction manual. Figure 9 In some embodiments, the feeding unit 2 further includes a second positioning mechanism 23, which is used to accurately position the weights on the first positioning mechanism 22.

[0068] The second positioning mechanism 23 includes a mounting frame 231, a positioning sleeve 232, and a positioning cylinder 233. The mounting frame 231 is fixed inside the lower compartment 11, and the positioning cylinder 233 is fixed on the mounting frame 231. The piston rod of the positioning cylinder 233 extends vertically and is used to drive the positioning sleeve 232 to move up and down. The positioning sleeve 232 is generally cylindrical and is located directly above the shared workstation of the workstation plate 21. Its axis is on the same straight line as the axis of the support shaft 221 located at the shared workstation. In this embodiment, the shared workstation is the rotating workstation on the workstation plate 21 when the feeding unit 4 transfers the weights from the feeding unit 2.

[0069] The lower end of the positioning sleeve 232 has a conical cavity 2321. The horizontal cross-section of the conical cavity 2321 is circular. In the direction that gradually moves away from the work station plate 21, the horizontal cross-sectional area of ​​the conical cavity 2321 gradually decreases, and the maximum horizontal cross-sectional area of ​​the conical cavity 2321 is greater than the maximum horizontal cross-sectional area of ​​the weight.

[0070] Thus, after the weight is initially positioned on the first positioning mechanism 22, the positioning sleeve 232 is driven downward by the positioning cylinder 233. During the downward movement, the positioning sleeve 232 can push the weight on the shared workstation to the center position of the first positioning mechanism 22. For example, when the weight shifts outward a certain distance on the first positioning mechanism 22, the positioning sleeve 232 can push the weight during the downward movement, causing it to move to the center of the first positioning mechanism 22, thereby achieving secondary precise positioning of the weight. After secondary positioning, the center line of the weight and the center line of the conical cavity are on the same straight line, enabling precise feeding from the feeding unit 4. In addition, the horizontal cross-sectional area of ​​the conical cavity 2321 gradually decreases in the direction gradually moving away from the workstation plate 21. This design is suitable for weights of different sizes and is convenient and flexible to use.

[0071] See the attached instruction manual. Figure 3 and Figure 4 In some embodiments, the feeding unit 2 also includes a limiting mechanism 24, which is used to limit the rotation of the workstation tray 21.

[0072] The limiting mechanism 24 includes a limiting frame 241, a limiting cylinder 242, and a limiting rod 243. The limiting frame 241 is fixed inside the lower compartment 11, and the limiting cylinder 242 is fixed to the limiting frame 241. The piston rod of the limiting cylinder 242 extends horizontally to drive the limiting rod 243 to move horizontally. The axis of the limiting rod 243 intersects the axis of the workstation 21. Multiple limiting holes 211 are provided on the outer periphery of the workstation 21. The number of limiting holes 211 is the same as the number of the first positioning mechanism 22, and they are evenly spaced around the workstation 21. Before grasping the weight on the workstation 21, the limiting cylinder 242 drives the limiting rod 243 to extend into the limiting hole 211 of the workstation 21, preventing excessive rotation of the workstation 21 and ensuring a stable grasping process for the weight.

[0073] See the attached instruction manual. Figure 2 and Figure 7 The feeding unit 4 includes a lifting mechanism 41, a sliding mechanism 42, a sliding frame 43, and a gripper 44.

[0074] The sliding frame 43 is disposed inside the lower compartment 11 and can slide relative to the lower compartment 11, moving closer to or further away from the workstation tray 21 of the feeding unit 2. Specifically, the sliding frame 43 has a plate-like structure and can slide along its width.

[0075] See the attached instruction manual. Figure 6 The sliding mechanism 42 is correspondingly set with the sliding frame 43. The sliding mechanism 42 uses a transverse feed motor 421 to drive the lead screw 422 to drive the sliding frame 43 to slide.

[0076] Specifically, the sliding mechanism 42 includes a transverse feed motor 421, a lead screw 422, and transverse guide rails (not shown). The two transverse guide rails are parallel and spaced apart, with their length direction aligned with the width direction of the sliding frame 43. The lead screw 422 extends along the width direction of the sliding frame 43, with a portion located outside the lower compartment 11. Both ends of the sliding frame 43 are slidably engaged with the two transverse guide rails, and the middle portion of the sliding frame 43 is screwed to the lead screw 422 via a nut seat. The transverse feed motor 421 is located outside the sealed compartment 1, and its output shaft is connected to the lead screw 422 for driving the lead screw 422 to rotate, thereby causing the sliding frame 43 to slide along the transverse guide rails.

[0077] See the attached instruction manual. Figure 6 and Figure 7 The gripper 44 is mounted on the sliding frame 43. By controlling the transverse feed motor 421, the distance between the gripper 44 and the workstation plate 21 and the weighing plate 31 can be adjusted to achieve the purpose of the gripper 44 moving closer to or further away from the workstation plate 21 and the weighing plate 31.

[0078] The lifting mechanism 41 is used to drive the gripper 44 to move up and down along the height direction of the sliding frame 43 so that the gripper 44 can grab the weight on the work station plate 21 and lower it to the weighing plate 31, or raise the weight on the weighing plate 31 to the work station plate 21.

[0079] See the attached instruction manual. Figure 6 The lifting mechanism 41 includes a lifting motor 411, a rotating shaft 412, and a lifting assembly.

[0080] See Figure 7 The lifting assembly includes a slide rail 414, a slide block 418, and a lifting transmission structure.

[0081] The slide rail 414 is arranged along the height direction of the sliding frame 43. In this embodiment, there are two slide rails 414, which are respectively arranged on the two side frames of the sliding frame 43 and close to the workstation plate 21. The slide base 418 is fixedly connected to the gripper 44 and slides in cooperation with the slide rail 414. In this embodiment, slide bases 418 are distributed on both side frames of the sliding frame 43.

[0082] The lifting transmission structure is connected to the gripper 44 and is used to drive the gripper 44 to move up and down along the slide rail 414.

[0083] Please refer to the attached instruction manual. Figure 6 and Figure 8 The lifting transmission structure includes a toothed belt 417, a lower sprocket 415, and an upper sprocket 416.

[0084] The upper sprocket 416 is rotatably connected to the top of the sliding frame 43, and the lower sprocket 415 is rotatably connected to the sprocket bracket 413. The sprocket bracket 413 is fixedly connected to the bottom of the sliding frame 43. The rotating shaft 412 extends along the width direction of the sliding frame 43 and is partially located outside the lower compartment. One end of the rotating shaft 412 is coaxially fixedly connected to the lower sprocket 415, and the end of the rotating shaft 412 that passes through the lower compartment 11 is connected to the output shaft of the lifting motor 411. The lifting motor 411 is located outside the sealed compartment 1 and is used to drive the rotating shaft 412 to rotate. The upper sprocket 416 and the lower sprocket 415 are connected by a toothed belt 417, and the toothed belt 417 is fixedly connected to the gripper 44.

[0085] Thus, while the sliding mechanism 42 drives the sliding frame 43 to slide, the lifting component moves synchronously with the sliding frame 43. The lifting motor 411 can drive the rotating shaft 412 to rotate the lower sprocket 415. The lower sprocket 415 and the upper sprocket 416 are driven by a toothed belt 417. During the movement, the toothed belt 417 drives the gripper 44 fixedly connected to it to move, thereby achieving the purpose of the gripper 44 moving along the sliding frame 43 in the height direction.

[0086] After prolonged operation, the motor will generate a large amount of heat. In this embodiment, the rotary motor 251, the transverse feed motor 421, and the lifting motor 411 are designed to be located outside the sealed chamber. This design can reduce the heat conduction through the axial sealed chamber, so that the temperature inside the sealed chamber can be maintained within a relatively stable range. This reduces the impact of temperature on the measurement results and ensures the accuracy and reliability of the measurement results.

[0087] See the attached instruction manual. Figure 7 and Figure 12 The gripper 44 is used to grip and place weights.

[0088] In this embodiment, the gripper 44 includes a gripper base 441 and a chuck 442. The gripper base 441 is fixedly connected to the slide 418, and the chuck 442 is fixedly connected to the side of the gripper base 441 near the workstation plate 21. The chuck 442 can grip the weights on the workstation plate 21 and the weighing pan 31.

[0089] The chuck 442 is generally plate-shaped. An arc-shaped notch is provided at one end of the chuck 442 away from the gripper seat 441. Multiple support parts 4421 are provided at the notch. The support parts 4421 are plate-shaped and extend from the inner wall of the notch to the center of the notch. The multiple support parts 4421 are distributed at intervals around the center of the notch. The space formed by the multiple support parts 4421 allows the support shaft 221 of the first positioning mechanism 22 to pass through it.

[0090] The principle of gripper 44 gripping the weight on workstation tray 21 is as follows: The lifting mechanism 41 and sliding mechanism 42 control the movement of gripper 44 in the vertical and horizontal directions, respectively. When gripper 44 moves horizontally and is below positioning member 223, the lifting mechanism 41 controls the gripper 44 to move upwards. During the upward movement of gripper 44, the support part 4421 on gripper 44 protrudes through the gap between positioning members 223 and lifts the weight on positioning member 223, thus separating the weight from workstation tray 21.

[0091] See the attached instruction manual. Figure 11 The weighing mechanism includes a weighing pan 31 and a support member. The weighing pan 31 is used to weigh the mass of the weights, and the support member is fixedly connected to the weighing pan 31 to support the weights. The support member includes a support column 321 and a support plate 322. The support column 321 is located in the middle of the weighing pan 31, and its axis extends vertically. Multiple support plates 322 are spaced apart and arranged around the outer periphery of the top of the support column 321.

[0092] The principle of the gripper 44 gripping the weights on the weighing pan 31 is as follows: The lifting mechanism 41 and the sliding mechanism 42 control the movement of the gripping shaft in the vertical and horizontal directions, respectively. When the gripper 44 moves below the support plate 322, the lifting mechanism 41 controls the gripper 44 to move upward. During the upward movement of the gripper 44, the support part 4421 on the gripper 44 will protrude through the gaps between the multiple support plates 322 and lift the weights on the support plates 322, thus separating the weights from the weighing pan 31.

[0093] The process of the gripper 44 placing the weight on the workstation pan 21 or the weighing pan 31 is the reverse of the gripping process. To save space, this embodiment will not describe it in detail.

[0094] The loading device in this embodiment is used as follows:

[0095] Place the weights one by one on the rotating station of the workstation 21.

[0096] Adjust the rotary drive mechanism to rotate the workstation disk 21, rotate the weight on one of the rotating workstations to the shared workstation, and lock the workstation disk 21 by the limiting mechanism 24.

[0097] Adjust the sliding mechanism 42 and the lifting mechanism 41 to move the gripper 44 to below the weight on the shared workstation. Then, use the lifting mechanism 41 to lift the weight and remove it from the workstation plate 21.

[0098] Adjust the sliding mechanism 42 to make the gripper 44 slide laterally away from the feeding unit 2. Adjust the lifting mechanism 41 to make the gripper 44 move downward. When the gripper 44 moves above the support on the weighing pan 31, adjust the sliding mechanism 42 again to make the gripper 44 move directly above the support. Then adjust the lifting mechanism 41 to make the gripper 44 drive the weight to continue moving downward. After the weight contacts the support, the weight is detached from the gripper 44 and supported by the weighing pan 31.

[0099] The weights are weighed using the weighing pan 31. After weighing, the lifting mechanism 41, the sliding mechanism 42, and the rotary drive mechanism are adjusted to return the weights on the weighing pan 31 to their shared workstation on the workstation plate 21.

[0100] Adjust the rotary drive mechanism to make the workstation plate 21 rotate, rotate the weight on another rotary workstation to the shared workstation, and limit and lock the workstation plate 21 through the limit mechanism 24.

[0101] By repeating the above steps, you can weigh multiple weights.

[0102] According to the dual-weighing volume and density measuring device proposed in this embodiment, the measurement method includes the following steps:

[0103] Based on the fundamental principle of hydrostatic buoyancy measurement, the weight is weighed twice within a preset atmospheric pressure measurement range to construct a double-weighing volume and density measurement model in air, thereby obtaining the measured volume and density of the weight.

[0104] Based on the volume expansion coefficient of the weight, a thermal expansion error correction model is constructed; the measured volume and the measured density are corrected using the thermal expansion error correction model to obtain the target volume and target density of the weight at the target temperature.

[0105] Analyze the uncertainty and optimize the dual weighing measurement model to output the optimized target volume and target density of the weight.

[0106] Based on the dual-weighing volume and density measuring device proposed in this invention, the volume and density of weights can be measured. For specific measurement methods, please refer to the dual-weighing volume and density measurement method disclosed in invention patent application number 2021116771856. The purpose of this application is to disclose the structure of the dual-weighing volume and density measuring device; the measurement method is not the innovation of this application, and for the sake of brevity, the measurement method will not be described in detail here.

[0107] The dual-weighing volume and density measuring device proposed in this invention has a compact structure, occupies little space, and requires no impact loading. It can measure volume and density in a single air fluid using a dual-weighing method through sealed pressure reduction technology. This solves a series of problems caused by the introduction of weights into water in the hydrostatic volume measurement method. The measurement results are highly accurate and can achieve integrated and efficient measurement of weight mass, volume, and density. It can also measure the volume of solid materials with complex dimensions and the porosity of porous materials. This provides a new approach for tracing the values ​​of weight volume and density, volume of solid materials with complex shapes, and porosity of porous materials, and has broad application prospects.

[0108] It should be noted that the above embodiments can be freely combined as needed. The above are merely preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A dual-weighing volume and density measuring device, characterized in that, include: Sealed chamber and loading device; The sealed chamber is connected to a vacuum pump via a pipe, and the air pressure value of the sealed chamber is in the range of 500 hPa to atmospheric pressure. The loading device includes a feeding unit, a conveying unit, and a weighing unit; The feeding unit includes a workstation tray and a rotary drive mechanism for driving the workstation tray to rotate. The workstation tray is rotatably connected to the sealed chamber. Multiple first positioning mechanisms are fixedly connected to the workstation tray. Each first positioning mechanism has multiple stepped portions. Each stepped portion includes multiple steps that are staggered in the height direction and multiple supporting weights that cooperate with each other. The feeding unit is used to transfer the weight between the feeding unit and the weighing unit. The feeding unit includes a gripper, a sliding frame, a sliding mechanism and a lifting mechanism. The sliding frame is set in the sealed chamber. The gripper is slidably connected to the sliding frame. The sliding mechanism is used to drive the sliding frame to move closer to or away from the workstation plate. The lifting mechanism is used to drive the gripper to move up and down. The weighing unit is located inside the sealed chamber and is used to weigh the weights. The power sources of the rotary drive mechanism, sliding mechanism and lifting mechanism are all located outside the sealed chamber, and the rotary drive mechanism, sliding mechanism and lifting mechanism are sealed to the sealed chamber. The first positioning mechanism includes a base and a plurality of positioning components. The base includes a support shaft and a plurality of support seats. The support shaft is fixedly connected to the outer side of the axis of the workstation plate. The plurality of support seats are spaced apart and arranged in a ring around the top of the support shaft. The plurality of positioning components are connected one-to-one to the plurality of support seats. The positioning component has a stepped portion. The feeding unit includes a second positioning mechanism, which includes a mounting frame and a positioning sleeve. The mounting frame is fixed inside the sealed chamber, and the positioning sleeve is movably connected to the mounting frame and located directly above the workstation plate, allowing it to approach or move away from the workstation plate. The lower end of the positioning sleeve has a conical cavity, and the horizontal cross-sectional area of ​​the conical cavity gradually decreases in the direction of gradually moving away from the workstation plate. After the workstation plate rotates by a predetermined angle, the positioning sleeve can cooperate with the positioning component, so that the center line of the weight on the positioning component is on the same straight line as the center line of the conical cavity.

2. The dual-weighing volume and density measuring device according to claim 1, characterized in that: The rotary drive mechanism includes a rotary motor located outside the sealed chamber and connected to the workstation plate via a transmission assembly to drive the workstation plate to rotate. The transmission assembly is sealed to the sealed chamber.

3. The dual-weighing volume and density measuring device according to claim 2, characterized in that: The transmission assembly includes multiple transmission shafts, which are connected by gear transmission. The two transmission shafts located at the beginning and end are respectively connected to the output shaft of the rotary motor and the workstation plate.

4. The dual-weighing volume and density measuring device according to claim 1, characterized in that: The feeding unit also includes a limiting mechanism, which includes a limiting frame and a limiting rod. The limiting frame is fixed inside the sealed chamber, and the limiting rod is movably connected to the limiting frame and moves closer to or further away from the workstation. The workstation has multiple limiting holes on its outer periphery. After the workstation rotates at a predetermined angle, the limiting rod can extend into one of the limiting holes on the workstation.

5. The dual-weighing volume and density measuring device according to claim 1, characterized in that: The sliding mechanism includes a transverse feed motor, transverse guide rails, and a lead screw. The two transverse guide rails are parallel and spaced apart. The lead screw extends along the length of the sliding frame and is partially located outside the sealed chamber. The two ends of the sliding frame are slidably engaged with the two transverse guide rails respectively. The middle part of the sliding frame is screwed to the lead screw through a nut seat. The transverse feed motor is located outside the sealed chamber, and its output shaft is driven by the lead screw.

6. The dual-weighing volume and density measuring device according to claim 1, characterized in that: The lifting mechanism includes a lifting motor, a rotating shaft, and a lifting assembly. The lifting assembly includes a slide rail, a slide base, and a lifting transmission structure. The gripper is slidably connected to the sliding frame via the slide rail and the slide base. The lifting transmission structure includes a lower sprocket, an upper sprocket, and a toothed belt. The lower sprocket and the upper sprocket are both rotatably connected to the sliding frame and are rotatably connected via the toothed belt. One end of the gripper is fixedly connected to the toothed belt. The lower sprocket is connected to the lifting motor via the rotating shaft and is driven to rotate by the lifting motor.

7. The dual-weighing volume and density measuring device according to claim 1, characterized in that: The gripper includes a gripper base and a chuck. The gripper base is slidably connected to the sliding frame, and the chuck is fixedly connected to the side of the gripper base near the workstation. The chuck has a plate-like structure, and an arc-shaped notch is opened at the end opposite to the gripper base. Multiple support parts are provided at the notch, and the support parts extend from the inner wall of the notch to the center of the notch. The multiple support parts are distributed at intervals around the center of the notch.

8. The dual-weighing volume and density measuring device according to claim 1, characterized in that: The sealed chamber includes an upper chamber and a lower chamber, which together form a sealed chamber capable of accommodating a loading device. The upper chamber is connected to a lifting mechanism and can move up and down relative to the lower chamber.

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