Particle size analyzer autosampler and laser particle size analyzer

Abstract

The present application provides a particle size analyzer automatic sampler and a laser particle size analyzer. The particle size analyzer automatic sampler is used in conjunction with the particle size analyzer body. The particle size analyzer body has a feed port, and the sample enters the test cavity inside the particle size analyzer body from the feed port. The particle size analyzer automatic sampler includes a turntable for rotatably cooperating with the particle size analyzer body, a plurality of cover plates movably connected to the turntable, and a plurality of weighing sensors. The turntable is provided with a plurality of feed holes arranged in a circumferential direction, and the plurality of feed holes can pass through the feed port in sequence when the turntable rotates. The plurality of cover plates are respectively matched with the plurality of feed holes in a one-to-one correspondence, and are used to open or close the corresponding feed holes. The plurality of weighing sensors are connected with the plurality of cover plates in a one-to-one correspondence, and the weighing sensors are used to weigh the weight of the material in the corresponding feed hole when the cover plates close the feed hole. The automation degree is high, the feeding is continuous, and the efficiency is high.

Description

Technical Field

[0001] The invention relates to the field of measurement technology, in particular to a particle size analyzer automatic sample injector and a laser particle size analyzer. Background Art

[0002] Laser particle size analyzer is an instrument that analyzes particle size by the spatial distribution of diffraction or scattered light from particles. Using Furanhofer diffraction and Mie scattering theory, the test process is not affected by many factors such as temperature changes, medium viscosity, sample density and surface state. Accurate test results can be obtained by evenly displaying the sample to be tested in the laser beam. At present, laser particle size analyzers use manual feeding, that is, after completing a measurement, a new sample is manually placed in the particle size analyzer for the next analysis test.

[0003] The inventors have found that the existing laser particle size analyzer has the following disadvantages:

[0004] The labor intensity is high and the efficiency is low; it is inconvenient to control the feeding amount of the sample. Summary of the invention

[0005] The object of the present invention is to provide a particle size analyzer automatic sample injector and a laser particle size analyzer, which can reduce labor intensity and improve operation efficiency.

[0006] The embodiment of the present invention is achieved as follows:

[0007] In a first aspect, the present invention provides a particle size analyzer automatic sample injector, which is used to cooperate with a particle size analyzer body, wherein the particle size analyzer body has a feed port, and the particle size analyzer automatic sample injector comprises:

[0008] A turntable for rotatably cooperating with the particle size analyzer body, the turntable being provided with a plurality of feeding holes arranged in a circumferential direction, the plurality of feeding holes being able to sequentially pass through the feeding port when the turntable rotates;

[0009] A plurality of cover plates movably connected to the rotating disk, the plurality of cover plates respectively corresponding to the plurality of feeding holes and used for opening or closing the corresponding feeding holes;

[0010] And a plurality of weighing sensors, wherein the plurality of weighing sensors are connected to the plurality of cover plates in a one-to-one correspondence, and the weighing sensors are used to weigh the weight of the material in the corresponding feed hole when the cover plate closes the feed hole.

[0011] In an optional embodiment, the cover plate is rotatably connected to the turntable to open or close the corresponding feeding hole.

[0012] In an optional embodiment, the cover plate includes a mounting plate body, a bearing plate body and a vibration membrane, the mounting plate body is movably connected to the cover plate for opening or closing the corresponding feeding hole; the bearing plate body is connected to the mounting plate body through the weighing sensor; the vibration membrane is connected to the bearing plate body, and the vibration membrane and the bearing plate body jointly define a storage cavity; an air duct connected to the storage cavity is provided on the bearing plate body.

[0013] In an optional embodiment, a positioning groove is provided on the supporting plate, the edge of the vibration membrane is connected to the notch of the positioning groove, and at least a portion of the vibration membrane can be embedded in the positioning groove, so that the vibration membrane defines a groove for collecting samples.

[0014] In an optional embodiment, a first air outlet, a connecting channel and a second air outlet connected in sequence are provided on the bottom wall of the positioning groove, the first air outlet is connected to the air channel, and the second air outlet is located on the side of the first air outlet away from the rotation axis of the mounting plate.

[0015] In an optional embodiment, a pressure valve is provided in the connecting channel.

[0016] In an optional embodiment, the vibration membrane has a first side and a second side relative to each other, the second side is located on the side of the first side away from the rotation axis of the mounting plate body, and the distance between the first side and the bottom of the groove is greater than the distance between the second side and the bottom of the groove.

[0017] In an optional embodiment, the particle size analyzer automatic sample injector further comprises a suction pump, and the suction pump is connected to the airway.

[0018] In an optional embodiment, the particle size analyzer automatic sampler further comprises a silo, the silo is provided with a discharge port, the silo is provided with a valve for opening or closing the discharge port, and the discharge port is used to transport the sample into the feed hole.

[0019] In a second aspect, the present invention provides a laser particle size analyzer, the laser particle size analyzer comprising:

[0020] The particle size analyzer automatic sample injector according to any one of the aforementioned embodiments.

[0021] The beneficial effects of the embodiments of the present invention are:

[0022] In summary, the automatic sampler of the particle size analyzer provided in this embodiment is used in conjunction with the particle size analyzer body. A set amount of sample is placed in each feed hole of the turntable. The amount of the sample is accurately weighed and obtained by the weighing sensor on the cover plate at each feed hole. The weight error of the sample tested each time is small, and the measurement result is more accurate. At the same time, the turntable can rotate relative to the particle size analyzer body, and multiple feed holes can pass through the feed port on the particle size analyzer body in sequence. When one of the multiple feed holes is aligned with the feed port, the cover plate at the corresponding position opens, the feed hole is opened, and the sample in the feed hole falls directly into the feed port, thereby performing the test. The continuous delivery of samples is achieved through the rotation of the turntable, which reduces labor intensity and improves work efficiency; and the sample in each feed hole can be weighed by the corresponding weighing sensor, so the sample weight is accurate and the measurement result is accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A schematic diagram of the structure of a laser particle size analyzer according to an embodiment of the present invention;

[0025] Figure 2 for Figure 1 Schematic diagram of the local enlarged structure in;

[0026] Figure 3 is a schematic structural diagram of a turntable according to an embodiment of the present invention;

[0027] Figure 4 It is a structural schematic diagram of a state of a part of the cover plate of an embodiment of the present invention;

[0028] Figure 5 It is a partial structural schematic diagram of another state of a part of the cover plate of an embodiment of the present invention.

[0029] icon:

[0030] 100- particle size analyzer body; 110- feed inlet; 200- turntable; 210- feed hole; 220- rotating shaft; 300- cover plate; 310- mounting plate; 320- bearing plate; 321- positioning groove; 322- first air outlet; 323- connecting channel; 324- second air outlet; 325- pressure valve; 330- vibrating membrane; 400- weighing sensor; 500- suction pump; 600- silo. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0032] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0035] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0036] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] At present, when using a laser particle size analyzer, samples are added manually, which is inefficient and difficult to control the amount of sample added each time, resulting in deviations in the test results.

[0038] In view of this, the designer designed a particle size automatic sampler that uses automated continuous feeding to reduce labor intensity and improve work efficiency; at the same time, the sample amount fed each time remains consistent or the error is within a reasonable range, which is conducive to testing.

[0039] See also Figure 1 and Figure 2 In this embodiment, the particle size analyzer automatic sampler is used in conjunction with the particle size analyzer body 100. The particle size analyzer body 100 has a feed port 110, and the sample enters the test cavity inside the particle size analyzer body 100 from the feed port 110. The particle size analyzer automatic sampler includes a turntable 200 for rotatably cooperating with the particle size analyzer body 100, a plurality of cover plates 300 movably connected to the turntable 200, and a plurality of weighing sensors 400. The turntable 200 is provided with a plurality of feed holes 210 arranged in a circumferential direction, and the plurality of feed holes 210 can pass through the feed port 110 in sequence when the turntable 200 rotates. The plurality of cover plates 300 respectively correspond to the plurality of feed holes 210 one by one, and are used to open or close the corresponding feed holes 210. The multiple weighing sensors 400 are connected to the multiple cover plates 300 in a one-to-one correspondence. The weighing sensors 400 are used to weigh the weight of the material in the corresponding feed hole 210 when the cover plate 300 closes the feed hole 210 .

[0040] The particle size analyzer automatic sampler provided in this embodiment is used in conjunction with the particle size analyzer body 100. A set amount of sample is placed in each feed hole 210 of the turntable 200. The amount of the sample is accurately weighed and obtained by the weighing sensor 400 on the cover plate 300 at each feed hole 210. The weight error of the sample tested each time is small, and the accuracy of the measurement result is higher. At the same time, the turntable 200 can rotate relative to the particle size analyzer body 100, and multiple feed holes 210 can pass through the feed port 110 on the particle size analyzer body 100 in sequence. When one of the multiple feed holes 210 is aligned with the feed port 110, the cover plate 300 at the corresponding position is opened, the feed hole 210 is opened, and the sample in the feed hole 210 directly falls into the feed port 110, so as to perform the test. The rotation of the turntable 200 enables continuous conveyance of samples, reduces labor intensity, and improves work efficiency; moreover, the samples in each feeding hole 210 can be weighed by the corresponding weighing sensor 400, so the sample weight is accurate and the measurement result is accurate.

[0041] See also Figure 3In this embodiment, the turntable 200 is optionally rotatably connected to the particle size analyzer body 100 through a motor. Specifically, the turntable 200 is configured as a circular disk, and a mounting hole is provided in the middle of the turntable 200. The mounting hole is coaxially arranged with the turntable 200, and the mounting hole can be a spline hole. The housing of the motor is fixed on the particle size analyzer body 100, and the output shaft of the motor is fixedly connected to the mounting hole through a spline. After the motor is started, it can drive the turntable 200 to rotate relative to the particle size analyzer body 100. It should be understood that the motor can be a servo motor for easy control.

[0042] Optionally, the plurality of feed holes 210 on the turntable 200 are evenly spaced and arranged on a circumference concentric with the turntable 200. Each feed hole 210 is configured as a conical hole, and the feed hole 210 has a first end and a second end in the direction of extension of its axis, and the aperture of the feed hole 210 gradually decreases from the first end to the second end. When the turntable 200 is disposed on the particle size analyzer body 100, the first end is away from the particle size analyzer body 100, and the second end faces the particle size analyzer body 100. The sample can enter the feed hole 210 from the first end to realize material addition, and because the caliber of the first end is large, when the sample is added, the probability of the material not entering the feed hole 210 is reduced, and it is convenient to add material to the feed hole 210.

[0043] It should be understood that in other embodiments, the turntable 200 may also be a square disk, and the feed hole 210 may also be a round hole or a square hole.

[0044] In this embodiment, optionally, the cover plate 300 is rotatably connected to the turntable 200 to open or close the second end of the corresponding material feeding hole 210 .

[0045] See also Figure 4 and Figure 5Optionally, the cover plate 300 includes a mounting plate body 310, a bearing plate body 320 and a vibration membrane 330, the mounting plate body 310 is configured as a square plate, and the mounting plate body 310 is rotatably connected to the cover plate 300, and is used to open or close the corresponding feed hole 210. For example, a rotating shaft 220 is mounted on the turntable 200, and the mounting plate body 310 is rotatably connected to the turntable 200 via the rotating shaft 220. Moreover, when the mounting plate body 310 closes the feed hole 210, the bearing plate body 320 and the vibration membrane 330 are both located in the feed hole 210, and have a spacing with the hole wall of the feed hole 210. Furthermore, a servo motor is arranged on the turntable 200, and the number of the servo motors is the same as the number of the cover plate 300, and each servo motor is used to drive a corresponding mounting plate body 310 to rotate relative to the rotating shaft 220. Specifically, the output shaft of the servo motor is connected to the rotating shaft 220, and the mounting plate body 310 is driven to rotate by driving the rotating shaft 220 to rotate. The bearing plate body 320 is connected to the mounting plate body 310 through the weighing sensor 400, and the vibration membrane 330 is connected to the bearing plate body 320, and the vibration membrane 330 is used to contact with the sample. The vibration membrane 330 and the bearing plate body 320 jointly define a storage cavity. An airway is provided on the bearing plate body 320, and the airway is connected to the storage cavity. The airway is used to transport gas to the storage cavity and to extract the gas in the storage cavity. In the initial state, the gas in the storage cavity is sucked out, so that the storage cavity is roughly in a vacuum state, the sample is located on the vibration membrane 330, and the weighing sensor 400 can detect the weight of the sample. Since the sample is carried by the vibration membrane 330, the vibration membrane 330 and the bearing plate body 320 do not contact the hole wall of the feeding hole 210, the weighing result is less affected by the friction force, and the weighing result is more accurate. After the sample weight meets the requirement and when the feed hole 210 rotates to a position aligned with the feed port 110, the servo motor drives the mounting plate 310 to rotate, and the sample on the vibration membrane 330 falls into the feed port 110 under the action of gravity, and gas is introduced into the storage cavity, and the gas suction action is repeated to make the gas continuously flow in and out of the storage cavity, so that the vibration membrane 330 vibrates. The sample on the vibration membrane 330 is not easy to adhere to the vibration membrane 330, so it can be completely separated from the vibration membrane 330 and enter the particle size analyzer body 100, so that the sample amount used for the test is more accurate and reliable, and the test result is more accurate.

[0046] Furthermore, a positioning groove 321 is provided on the bearing plate 320, and the edge of the vibration membrane 330 is connected to the notch of the positioning groove 321, and at least a part of the vibration membrane 330 can be embedded in the positioning groove 321, so that the vibration membrane 330 defines a groove for collecting samples, and the samples are stored in the groove, which is more convenient to be weighed. In addition, when the storage cavity is in a vacuum state, the vibration membrane 330 is embedded in the positioning groove 321 to form a groove, at this time, there are a first side and a second side opposite to each other, the second side is located on the side of the first side away from the rotation axis 220 line of the mounting plate 310, and the distance between the first side and the groove bottom of the groove is greater than the distance between the second side and the groove bottom of the groove. With this design, when the gas enters the storage cavity or, the distance between the protruding positioning groove 321 of the vibration membrane 330 on the first side is greater than the distance between the protruding positioning groove 321 on the second side, that is, the first side protrudes higher than the second side, and the vibration membrane 330 forms an inclined surface, and the lower side of the inclined surface corresponds to the feed port 110. The sample rolls on the inclined surface and falls into the feed port 110 more easily.

[0047] Furthermore, the bottom wall of the positioning groove 321 is provided with a first air outlet 322, a connecting channel 323 and a second air outlet 324 which are connected in sequence. The first air outlet 322 is connected with the air passage, and the second air outlet 324 is located on the side of the first air outlet 322 away from the rotation axis 220 line of the mounting plate body 310. A pressure valve 325 is provided in the connecting channel 323. When the air passage is used to ventilate the storage cavity, the gas first enters the storage chamber from the first air outlet 322, thereby driving the area near the first side of the vibration membrane 330 to unfold, and part of the vibration membrane 330 is first separated from the groove wall of the positioning groove 321. Then, when the gas pressure in the storage cavity reaches a certain level, the pressure valve 325 is automatically opened, and the gas can be ventilated into the storage cavity from the first air outlet 322 and the second air outlet 324 at the same time, so as to avoid a large deformation of the vibration membrane 330, and the vibration amplitude is small, so that it is not easy for the material to be directly ejected and not enter the feed port 110.

[0048] In this embodiment, the particle size analyzer automatic sampler optionally further includes a suction pump 500, which is connected to the airway through a hose, and is used to fill the storage cavity with gas or to suck out the gas in the storage cavity. It should be understood that each airway can be equipped with a suction pump 500, or a suction pump 500 is connected to multiple airways through multiple pipes, each pipe is provided with a solenoid valve, and when ventilation or extraction is required, the corresponding solenoid valve is opened.

[0049] In this embodiment, the particle size analyzer automatic sampler may further include a silo 600, which is connected to the particle size analyzer body 100. The silo 600 is provided with a discharge port, and a valve for opening or closing the discharge port is provided on the silo 600. The discharge port is used to deliver the sample to the feed hole 210. The silo 600 can be used to add material to the feed hole 210, and the adding operation can be completed while feeding the material, thereby improving the operation efficiency. That is, after the sample in the feed hole 210 enters the feed port 110, the empty feed hole 210 continues to rotate to the discharge port of the silo 600, and the material is added through the silo 600. At the same time, one of the multiple feed holes 210 loaded with the sample is just aligned with the feed port 110, so that the sample can be delivered to the particle size analyzer body 100.

[0050] The automatic sample injector for the particle size analyzer provided in this embodiment has a high degree of automation, low labor intensity, high efficiency, and accurate and reliable test results.

[0051] This embodiment further provides a laser particle size analyzer, including a particle size analyzer body 100 and the particle size analyzer automatic sample feeder mentioned in the above embodiment. The turntable 200 is rotatably connected to the particle size analyzer body 100 , and the turntable 200 is used to continuously transport samples into the particle size analyzer body 100 .

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A particle size analyzer automatic sample injector, used to cooperate with a particle size analyzer body (100), wherein the particle size analyzer body (100) has a feed port (110), characterized in that: The particle size analyzer automatic sample injector comprises: A turntable (200) for rotatably cooperating with the particle size analyzer body (100), the turntable (200) being provided with a plurality of material delivery holes (210) arranged in a circumferential direction, the plurality of material delivery holes (210) being capable of passing through the material feed port (110) in sequence when the turntable (200) rotates; a plurality of cover plates (300) movably connected to the rotating disk (200), the plurality of cover plates (300) respectively corresponding to the plurality of material feeding holes (210) and used to open or close the corresponding material feeding holes (210); and a plurality of weighing sensors (400), the plurality of weighing sensors (400) being connected to the plurality of cover plates (300) in a one-to-one correspondence, the weighing sensors (400) being used to weigh the weight of the material in the corresponding material feeding hole (210) when the cover plate (300) closes the material feeding hole (210); The cover plate (300) is rotatably connected to the rotating disk (200) and is used to open or close the corresponding material feeding hole (210); The cover plate (300) comprises a mounting plate body (310), a bearing plate body (320) and a vibration membrane (330); the mounting plate body (310) is rotatably connected to the turntable (200) and is used to open or close the corresponding material feeding hole (210); the bearing plate body (320) and the mounting plate body (310) are connected via the weighing sensor (400); the vibration membrane (330) is connected to the bearing plate body (320), and the vibration membrane (330) and the bearing plate body (320) jointly define a storage cavity; an air channel connected to the storage cavity is provided on the bearing plate body (320), and the air channel is used to transport gas to the storage cavity and to extract gas from the storage cavity; in an initial state, the gas in the storage cavity is sucked out, so that the storage cavity is in a vacuum state, and the sample is located on the vibration membrane; when gas is introduced into the storage cavity, the gas suction action is repeated.

2. The automatic sample injector for particle size analyzer according to claim 1, characterized in that: A positioning groove (321) is provided on the carrier plate (320), an edge of the vibration membrane (330) is connected to a notch of the positioning groove (321), and at least a portion of the vibration membrane (330) can be embedded in the positioning groove (321), so that the vibration membrane (330) defines a groove for collecting samples.

3. The automatic sample injector for particle size analyzer according to claim 2, characterized in that: A first air outlet (322), a connecting channel (323) and a second air outlet (324) which are connected in sequence are arranged on the bottom wall of the positioning groove (321); the first air outlet (322) is connected to the air channel, and the second air outlet (324) is located on a side of the first air outlet (322) away from the rotation axis (220) of the mounting plate body (310).

4. The automatic sample injector for particle size analyzer according to claim 3, characterized in that: A pressure valve (325) is provided in the connecting channel (323).

5. The automatic sample injector for particle size analyzer according to claim 2, characterized in that: The vibration membrane (330) has a first side and a second side opposite to each other, the second side is located on a side of the first side away from the rotation axis (220) of the mounting plate body (310), and the distance between the first side and the bottom of the groove is greater than the distance between the second side and the bottom of the groove.

6. The automatic sample injector for particle size analyzer according to any one of claims 1 to 5, characterized in that: The particle size analyzer automatic sample injector further comprises a suction pump (500), wherein the suction pump (500) is in communication with the airway.

7. The automatic sample injector for particle size analyzer according to claim 1, characterized in that: The particle size analyzer automatic sampler further comprises a material bin (600), the material bin (600) being provided with a material outlet, the material bin (600) being provided with a valve for opening or closing the material outlet, the material outlet being used for conveying the sample into the material delivery hole (210).

8. A laser particle size analyzer, characterized in that: The laser particle size analyzer comprises: The automatic sample injector for particle size analyzer according to any one of claims 1 to 7.

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