Sample injection device and particle size analyzer

Abstract

The present invention discloses a sampling device and a particle size analyzer, wherein the sampling device comprises: a material bin, comprising an outer shell, wherein the outer shell has an inner cavity, wherein a partition is arranged in the inner cavity, wherein the partition divides the inner cavity into a front bin and a rear bin, wherein a plurality of circumferentially distributed inclined plates are arranged in the front bin, wherein a plurality of circumferentially distributed oblique tooth grooves are arranged in the rear bin, wherein the oblique tooth grooves are connected to the front bin; a driving part, which is used to drive the material bin to rotate around its own central axis; a feeding part, which is connected to the front bin; and a discharging part, which is connected to the rear bin. The present invention has a simple structure and a small volume, and can meet the requirements of the sampling of large particles without vibrating the feeding system, and is conducive to the integration of the optical window and the sampling system.

Description

Technical Field

[0001] The invention relates to the field of particle sampling, and in particular to a sampling device and a particle size analyzer. Background Art

[0002] The particle size analyzer is an instrument used to study the particle size composition of fine particles. A sample delivery device is required to deliver the sample into the instrument. For dry analysis of ordinary powder particle size, vibration sampling or airflow dispersion sampling is used. Ordinary vibration sampling requires a vibrating silo, which is not conducive to the integration of the optical window and the sampling system. Although airflow dispersion sampling does not require the sampling system to vibrate, it can no longer meet the requirements when it is extended to the particle size analysis of large particles. There are also gravity serpentine flow dispersion devices in the vertical plane, which require a large vertical height from the feed inlet to the optical analysis window, which requires the window to have a large structural size, making it extremely inconvenient to use and operate. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a sample introduction device with a simple structure and a small volume, which can meet the requirements of large particle size introduction without vibrating the feeding system, and is conducive to the integration of the optical window and the sample introduction system.

[0004] The present invention also provides a particle size analyzer having the above-mentioned sample injection device.

[0005] A sampling device according to the first aspect of an embodiment of the present invention comprises: a material bin, comprising an outer shell, the outer shell having an inner cavity, a partition being arranged in the inner cavity, the partition dividing the inner cavity into a front bin and a rear bin, the front bin being provided with a plurality of circumferentially distributed inclined plates, the rear bin being provided with a plurality of circumferentially distributed oblique tooth grooves, the oblique tooth grooves being connected to the front bin; a driving part, used for driving the material bin to rotate around its own central axis; a feeding part, connected to the front bin; and a discharging part, connected to the rear bin.

[0006] According to the first aspect of the embodiment of the present invention, a sampling device has at least the following beneficial effects: when working, the hopper is driven to rotate by the driving part, and when rotating along the inclined direction of the beveled tooth groove, the sample particles can be mixed and dispersed, and the sample particles are driven to move toward the front hopper or the rear hopper at the same time. Due to the centripetal force and the friction and pressure between the particles and the side walls of the beveled tooth groove, the sample will not fall. When rotating in the opposite direction, due to the lack of friction and pressure on the side walls of the beveled tooth groove, the sample can be sampled. The intensity of sample dispersion and mixing and the sampling speed can be controlled by adjusting the rotation speed of the hopper. The present invention has a simple structure and a small volume, and can meet the sampling of large particles without vibrating the feeding system, which is conducive to the integration of the optical window and the sampling system.

[0007] According to a sampling device of the first aspect of an embodiment of the present invention, the driving part includes a motor, a first supporting shaft and a bracket, the motor and the first supporting shaft are both arranged on the bracket, the output shaft of the motor is connected to the first supporting shaft, driving the first supporting shaft to rotate, the first supporting shaft and the silo are in conflict, and the axial direction of the first supporting shaft is parallel to the axial direction of the outer shell.

[0008] According to a sampling device of the first aspect of an embodiment of the present invention, the driving part also includes a second supporting shaft arranged on the bracket, the axial direction of the second supporting shaft is parallel to the axial direction of the first supporting shaft, the material bin is arranged above the first supporting shaft and the second supporting shaft, and the material bin is respectively in conflict with the first supporting shaft and the second supporting shaft.

[0009] According to a sampling device of the first aspect of an embodiment of the present invention, the discharge part includes a discharge pipe, the rear bin is provided with a discharge port, and one end of the discharge pipe enters the rear bin from the discharge port.

[0010] According to a sample feeding device of the first aspect of an embodiment of the present invention, a fixing plate is provided on one side of the rear bin where the discharge port is provided, and the fixing plate and the discharge pipe are connected by a pin.

[0011] According to a sample injection device of the first aspect of an embodiment of the present invention, the feeding part includes a tube body and a funnel, one end of the tube body is connected to the funnel, and the other end of the tube body is connected to the front chamber.

[0012] According to a sampling device of the first aspect of an embodiment of the present invention, bevel blocks are provided between adjacent bevel grooves, all bevel grooves 105 and bevel blocks 106 form an inner gear ring, and the outer circle of the partition 102 is fixed in the inner gear ring.

[0013] In a sample injection device according to the first aspect of an embodiment of the present invention, the angle formed by the inclined plate or the inclined tooth groove and the axis of the silo is in the range of 15-75 degrees.

[0014] In a sample injection device according to a first aspect of an embodiment of the present invention, the inclined tooth groove and the inclined plate have the same inclination direction.

[0015] A second aspect of an embodiment of the present invention provides a particle size analyzer, comprising the sample injection device described in the first aspect of an embodiment of the present invention.

[0016] According to a second aspect of an embodiment of the present invention, a particle size analyzer is provided, which has the same beneficial effects as the sample injection device described in the first aspect.

[0017] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0019] Figure 1 It is a schematic structural diagram of a sample injection device according to an embodiment of the present invention;

[0020] Figure 2 for Figure 1 BB cross-sectional view;

[0021] Figure 3 for Figure 1 AA section view;

[0022] Figure 4 for Figure 1 A top view of a sample injection device;

[0023] Figure 5 for Figure 1 A schematic structural diagram of the sampling device from another angle. DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0025] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and 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 orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0026] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0027] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0028] A sample feeding device of this embodiment includes a silo 100, a driving part 200, a feeding part 300 and a discharging part 400. The housing 101 has an inner cavity, and a partition 102 is provided in the inner cavity. The partition 102 divides the inner cavity into a front bin 103 and a rear bin 104. There is a gap between the outer circle of the partition 102 and the inner wall of the silo 100 to connect the front bin 103 and the rear bin 104. The front bin 103 is provided with a plurality of circumferentially distributed inclined plates 107. The number of inclined plates 107 is 2 to 8, 3 in this embodiment, and 2 or 8 in other embodiments. The inclined plates 107 are integrally formed with the housing 101, and are mainly used to disperse and mix materials when the silo 100 rolls, reduce the speed of materials entering the rear bin 104, and fully mix the materials. A plurality of circumferentially distributed oblique tooth grooves 105 are provided in the rear bin 104. The oblique tooth grooves 105 are inclined at a certain angle in the bin 100. The oblique tooth grooves 105 and the front bin 103 are connected through the gap between the outer circle of the partition 102 and the inner wall of the bin 100. The material can enter the groove of the oblique tooth groove 105 from the front bin 103 through the gap. The driving part 200 is mainly used to drive the silo 100 to rotate around its own central axis. The two rotation directions of the rotating silo 100 have different functions. The forward direction is for mixing and dispersing; the reverse direction is for sampling. The forward and reverse directions are determined by the inclination direction of the inclined plate 107 and the inclined tooth groove 105. The forward direction is consistent with the inclination direction of the inclined tooth groove 105. The silo 100 drives the sample particles to roll in the silo 100, that is, the inclined plate 107 and the inclined tooth groove 105 drive the sample particles to move to the front bin 103 or the rear bin 104. By adjusting the forward rotation speed of the rotating silo 100, the intensity of mixing and dispersing can be adjusted. By adjusting the reverse rotation speed of the rotating silo 100, the sampling speed, that is, the shading ratio, can be adjusted. The upper limit of the rotation speed of the rotating silo 100 is that the centripetal acceleration of the sample in the bin is less than the acceleration of gravity. The feeding part 300 is connected to the front bin 103, and the discharging part 400 is connected to the rear bin 104. The material sample enters the front bin 103 from the feed section 300, enters the rear bin 104 through the gap between the partition 102 and the bin 100, and finally enters the discharge section 400 from the rear bin 104. The discharge section 400 delivers the sample to the detection area.

[0029] During operation, the silo 100 is driven to rotate by the driving unit 200. When rotating along the inclined direction of the beveled tooth groove 105, the sample particles can be mixed and dispersed, and the sample particles are driven to move toward the front bin 103 or the rear bin 104. Due to the centripetal force and the friction and pressure between the particles and the side walls of the beveled tooth groove 105, the sample will not fall. When rotating in the opposite direction, due to the lack of friction and pressure on the side walls of the beveled tooth groove 105, the sample can be injected. The intensity of sample dispersion and mixing and the injection speed can be controlled by adjusting the rotation speed of the silo 100. In actual use, dispersion balls of a certain diameter and material can be added as needed to participate in the dispersion. The diameter of the dispersion balls is large enough so that they cannot enter the gap of the partition 102. The silo of the present invention does not need to be disassembled, which is conducive to cleaning. The overall structure is simple and the volume is small. It can meet the injection of large particles without vibrating the feeding system, which is conducive to the integration of the optical window and the injection system.

[0030] In a sample injection device according to an embodiment of the present invention, the driving part 200 includes a motor 202, a first supporting shaft 201 and a bracket 204. The motor 202 and the first supporting shaft 201 are both arranged on the bracket 204. The output shaft of the motor 202 is connected to the first supporting shaft 201 to drive the first supporting shaft 201 to rotate. The first supporting shaft 201 and the silo 100 are in conflict with each other, and the axial direction of the first supporting shaft 201 is parallel to the axial direction of the housing 101. When the motor 202 drives the first supporting shaft 201 to rotate, the silo 100 rotates following the first supporting shaft 201 due to friction. Specifically, the motor 202 of this embodiment adopts a reduction motor, and contains a speed control system to control the speed of the motor. In other embodiments, a stepper motor 202 or a servo motor 202 may also be used.

[0031] In a sample injection device according to an embodiment of the present invention, the driving part 200 further includes a second supporting shaft 203 disposed on the bracket 204, the axial direction of the second supporting shaft 203 is parallel to the axial direction of the first supporting shaft 201, the silo 100 is disposed on the upper part of the first supporting shaft 201 and the second supporting shaft 203, and the silo 100 is respectively in conflict with the first supporting shaft 201 and the second supporting shaft 203. The second supporting shaft 203 and the first supporting shaft 201 jointly support the silo 100, and the second supporting shaft 203 rotates with the silo 100 as a driven supporting shaft.

[0032] In a sample feeding device of an embodiment of the present invention, the discharge part 400 includes a discharge pipe 401, and the rear chamber 104 is provided with a discharge port. One end of the discharge pipe 401 enters the rear chamber 104 from the discharge port. The depth of the discharge pipe 401 head extending into the discharge port is adjusted to meet the requirements of sample feeding of different particle sizes. A fixed plate 500 is provided on the side of the rear chamber 104 where the discharge port is provided, and the fixed plate 500 and the discharge pipe 401 are connected by a pin. The discharge pipe 401 can be rotated or moved, and the depth of the discharge pipe 401 head extending into the discharge port is adjusted as required, and then the discharge pipe 401 is fixed.

[0033] In a sample feeding device according to an embodiment of the present invention, the feeding part 300 includes a tube body 301 and a funnel 302. One end of the tube body 301 is connected to the funnel 302, and the other end is connected to the front bin 103. The front bin 103 is provided with a feeding port. After the tube body 301 enters the feeding port, it is fitted with a clearance between the feeding port, and the feeding is not affected when the bin 100 rotates.

[0034] In a sample injection device according to an embodiment of the present invention, an inclined block 106 is provided between adjacent inclined tooth grooves 105 , and all the inclined tooth grooves 105 and the inclined blocks 106 form an inner tooth ring, and the outer circle of the partition plate 102 is fixed to the inner tooth ring.

[0035] In a sample introduction device according to an embodiment of the present invention, the angle between the inclined plate 107 or the inclined tooth groove 105 and the axis of the silo 100 is in the range of 15-75 degrees, which has good mixing and dispersing effects, and the inclined tooth groove 105 and the inclined plate 107 have the same inclination direction, which facilitates the sample to enter the inclined tooth groove 105 .

[0036] The embodiment of the present invention further provides a particle size analyzer, including the sample injection device of the above embodiment, which has the same beneficial effects as the sample injection device of the first aspect and will not be described in detail here.

Claims

1. A sample injection device, characterized in that: include: A material bin (100) comprises an outer shell (101), the outer shell (101) having an inner cavity, a partition (102) being provided in the inner cavity, the partition (102) dividing the inner cavity into a front bin (103) and a rear bin (104), the front bin (103) being provided with a plurality of circumferentially distributed inclined plates (107), the rear bin (104) being provided with a plurality of circumferentially distributed inclined tooth grooves (105), the inclined tooth grooves (105) being in communication with the front bin (103); A driving unit (200), used for driving the silo (100) to rotate around its central axis; A feeding portion (300) connected to the front chamber (103); A discharge portion (400) connected to the rear bin (104); When rotating along the inclination direction of the oblique tooth groove (105), sample particles are mixed and dispersed, and at the same time, the sample particles are driven to move toward the front bin (103) or the rear bin (104); when rotating in the opposite direction to the inclination direction of the oblique tooth groove (105), the sample is injected, and the intensity of sample dispersion and mixing and the injection speed are controlled by adjusting the rotation speed of the bin (100).

2. A sample injection device according to claim 1, characterized in that: The driving unit (200) comprises a motor (202), a first supporting shaft (201) and a bracket (204); the motor (202) and the first supporting shaft (201) are both arranged on the bracket (204); the output shaft of the motor (202) is connected to the first supporting shaft (201); the motor (202) drives the first supporting shaft (201) to rotate; the first supporting shaft (201) and the housing (101) are in conflict with each other; and the axial direction of the first supporting shaft (201) is parallel to the axial direction of the silo (100).

3. A sample injection device according to claim 2, characterized in that: The driving part (200) further comprises a second supporting shaft (203) arranged on the bracket (204), the axial direction of the second supporting shaft (203) being parallel to the axial direction of the first supporting shaft (201), the silo (100) being arranged above the first supporting shaft (201) and the second supporting shaft (203), and the silo (100) being in conflict with the first supporting shaft (201) and the second supporting shaft (203), respectively.

4. A sample injection device according to claim 1, characterized in that: The discharge portion (400) comprises a discharge pipe (401), the rear bin (104) is provided with a discharge port, and one end of the discharge pipe (401) enters the rear bin (104) from the discharge port.

5. A sample injection device according to claim 4, characterized in that: A fixing plate (500) is provided on one side of the rear bin (104) where a discharge port is provided, and the fixing plate (500) and the discharge pipe (401) are connected via a pin.

6. A sample injection device according to claim 1, characterized in that: The feeding part (300) comprises a tube body (301) and a funnel (302); one end of the tube body (301) is connected to the funnel (302), and the other end of the tube body (301) is connected to the front chamber (103).

7. A sample injection device according to claim 1, characterized in that: An oblique block (106) is provided between adjacent oblique tooth grooves (105), and all the oblique tooth grooves (105) and the oblique blocks (106) form an inner tooth ring, and the outer circle of the partition plate (102) is fixed on the inner tooth ring.

8. A sample injection device according to claim 1, characterized in that: The angle formed by the inclined plate (107) or the inclined tooth groove (105) and the axis of the silo (100) is in the range of 15-75 degrees.

9. A sample injection device according to claim 1 or 8, characterized in that: The inclined tooth groove (105) and the inclined plate (107) have the same inclination direction.

10. A particle size analyzer, characterized in that: It comprises the sampling device as described in any one of claims 1 to 9.

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