CN111069032A

CN111069032A - Soil screening instrument for laboratory

Info

Publication number: CN111069032A
Application number: CN202010035715.6A
Authority: CN
Inventors: 雷婧; 张绵绵; 高晓哲; 刘博�; 许丹
Original assignee: Hebei Province Environmental Protection Product Quality Supervision And Inspection Institute
Current assignee: HEBEI RESEARCH INSTITUTION FOR PRODUCT QUALITY SUPERVISION AND INSPECTION
Priority date: 2020-01-14
Filing date: 2020-01-14
Publication date: 2020-04-28
Anticipated expiration: 2040-01-14
Also published as: CN111069032B

Abstract

The invention discloses a soil screening instrument for a laboratory, which comprises a screening device and a vibrating device, wherein the screening device comprises a chassis, at least one sample separating screen and a top cover which are sequentially stacked together from bottom to top, the sample separating screen comprises a fixed frame and a screen, two corresponding sides of the screen are respectively and fixedly arranged at one third of the height of a first fixed plate of the fixed frame from bottom to top, the other two corresponding sides of the screen are respectively and fixedly arranged at the bottom edge of a second fixed plate of the fixed frame, and the two sides of the screen connected with the first fixed plate are positioned on the first fixed plate and are higher than the height of the bottom of the screen projected on the first fixed plate; a discharge hole used for taking out the screened articles is formed in the center of the bottom of the side face of one of the second fixing plates. The invention is convenient for easily taking out the screened articles in the sample separating sieve and reduces the residue of the articles on the sample separating sieve. The invention is suitable for soil detection and analysis in a laboratory and is used for sieving soil.

Description

Soil screening instrument for laboratory

Technical Field

The invention belongs to the technical field of soil screening, and particularly relates to a soil screening instrument for a laboratory.

Background

With the rapid development of the industry, the problem of soil pollution is more and more serious due to the random discharge of sewage and the random burying of solid wastes. China pays more and more attention to the problem of soil pollution, and soil detection activities in most areas are more and more frequent. In the prior art, for soil detection, laboratory detection personnel generally air-dry a soil sample obtained by sampling, and then use a soil screening instrument to screen the soil into the soil with different particle size grades by using screens with different apertures. In general, the soil required for physical analysis is typically screened through a 2mm mesh screen, and the soil required for chemical analysis is typically screened through a 1 mm/0.5 mm mesh screen.

However, the soil samples used for testing are generally collected in small quantities and the soil samples of different particle size grades are relatively less abundant after being screened through screens of different sizes. This results in a cumbersome process of taking out the soil sample from the sample separating screen, which wastes a lot of time and energy for laboratory testing personnel; and the work of the detection personnel is refined, and soil samples are inevitably remained on the sample separating sieve, so that certain pollution is caused to the sample separating sieve.

Disclosure of Invention

In order to solve the defects in the prior art, the invention aims to provide a soil screening instrument for a laboratory, so that the purposes that the soil screening instrument can easily and conveniently take out articles from a sample separating sieve after screening soil and reduce the residues of the articles on the sample separating sieve are achieved.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a soil screening instrument for a laboratory comprises a screening device and a vibrating device, wherein the screening device comprises a chassis, at least one sample separating screen and a top cover which are sequentially detachably arranged from bottom to top, and a plurality of sample separating screens stacked from top to bottom are provided, the aperture of each screen mesh is gradually reduced, each sample separating screen comprises a fixing frame and a screen mesh, the fixing frame is of a square cylindrical structure formed by sequentially connecting four vertically arranged fixing plates, two corresponding fixing plates in the fixing frame are first fixing plates, and the other two corresponding fixing plates in the fixing frame are second fixing plates;

the development shape of the screen is square, and the four edges of the screen are fixedly connected with the inner wall of the fixing frame in a seamless manner; the screen is provided with two corresponding sides which are fixedly arranged on the first fixing plate respectively and correspond to one third of the height of the first fixing plate from bottom to top, the other two corresponding sides are fixedly arranged on the bottom edge of the second fixing plate respectively, and the two sides of the screen connected with the first fixing plate are positioned on the first fixing plate and are higher than the height of the bottom of the screen projected on the first fixing plate; the bottom of one of the second fixing plates is provided with a discharge hole corresponding to the lowest point of the screen.

As the limitation of the invention, the vibration device comprises an outer shell, at least one electric push rod, a vibration disc and a fixed frame, wherein the electric push rod is vertically and fixedly arranged in the outer shell, the power output end of the electric push rod is fixedly connected with the vibration disc for placing the screening device, and the fixed frame is vertically and fixedly arranged on the upper surface of the vibration disc.

As a further limitation of the invention, the vibration disc is of a cuboid structure, four vertexes of the lower surface of the vibration disc are respectively connected with the power output end of an electric push rod, and the electric push rod is fixedly connected with the vibration disc through a metal spring.

As still further defined by the present invention, the fixing frame includes a pillar and a cross bar screwed to the top of the pillar, and a fixing block is fixed vertically downward at a free end of the cross bar.

As another limitation of the invention, the connection relationship between the base plate and the sample separating sieve, between two adjacent sample separating sieves, and between the sample separating sieve and the top cover are in a plug-in connection relationship respectively.

As a further limitation of the invention, the top of each second fixing plate is provided with a limit groove corresponding to the equal division position of the size in the horizontal direction, and the bottom of the side surface of the first fixing plate is provided with a limit block matched with the limit groove.

As a further limitation of the invention, the top of each first fixing plate is provided with a limit groove corresponding to the equal division position of the size in the horizontal direction, and the bottom of the side surface of the second fixing plate is provided with a limit block matched with the limit groove.

As a still further limitation of the present invention, the screen is removably fixedly attached to the fixed frame.

As a further limitation of the present invention, the sample separating screen is made of any one of the following materials:

A. the fixing frame is made of plastic, and the screen is made of nylon;

B. the fixing frame and the screen are made of metal.

The invention is further limited in that the top cover is provided with at least one fixing groove which is convenient for fixing the sample separating screen on the vibration device, and the fixing groove is matched with the fixing block on the cross bar of the fixing frame.

Due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:

(1) when the screen is fixedly arranged at the bottom of the fixed frame, four edges are not fixed on the same horizontal plane, but one opposite two edges are raised, so that the screen forms a V-shaped curved surface with two high sides and a low middle at the bottom of the fixed frame, soil is screened on the inclined plane, and screening efficiency is improved. The soil after screening treatment can be easily taken out from the sample separating sieve by matching with a discharge port arranged at the center of the bottom of the fixed frame (namely the discharge port is positioned in the horizontal length direction of the screen pit);

(2) the base plate, the plurality of sample separating sieves and the top cover are sequentially connected together in an inserting manner, so that the sample separating sieves formed by stacking and combining are more stable as a whole, and the sample separating sieves can be effectively prevented from being wholly inclined or partially separated when vibrating on a soil screening instrument;

(3) according to the invention, the sample separating screen fixing frame is provided with the limiting block and the limiting groove, so that the stability of the device is further ensured on one hand; on the other hand, due to the arrangement of the special positions of the limiting grooves and the limiting blocks, when a plurality of sample separating sieves are stacked and combined together, the horizontal length directions of the depressions formed by the sieve nets between the adjacent sample separating sieves can be mutually vertical, so that the objects screened by the upper layer of sample separating sieve (especially the objects screened from the lowest end of the sieve net) can fall on the inclined surface of the sieve net of the lower layer of sample separating sieve instead of falling into the lowest end of the sieve net vertically, and the screening efficiency of the whole device is improved;

(4) the screen is detachably and fixedly arranged at the bottom end of the fixing frame, so that after the sample separating screen is used for screening objects, the sample separating screen can be comprehensively cleaned after the screen is detached, and the objects remained on the sample separating screen are prevented from polluting a sample to be screened next time;

(5) the sample separating sieve adopts the fixing frame and the screen made of all-metal materials or the plastic fixing frame and the screen made of nylon materials, so that when different detections are carried out on soil samples, the soil can be screened by selecting the proper sample separating sieve. For example, when the trace metal element is measured on soil, a sample separating sieve consisting of a plastic fixing frame and a nylon screen is needed; when the soil is analyzed for organic pollutants, a sample separating sieve made of all metal materials is needed;

(6) the vibrating device adopts four electric push rods as a driving mechanism to vibrate the vibrating disc, and the four electric push rods are respectively positioned at the four end points of the vibrating disc, so that the vibrating disc can vibrate in different modes through the telescopic control of the electric push rods, and the vibration frequency of the vibrating disc can be controlled through the adjustment of the telescopic frequency of the electric push rods, so that the device can meet different requirements of soil screening in a laboratory. After the device is used for screening soil, the screening device can be inclined by controlling two electric push rods to lift the other two electric push rods to contract, and the soil can be taken out of the sample screening device without excessive operation of laboratory detection personnel;

(7) the fixing frame structure of the invention is the pillars and the cross bars which are connected together by screw threads, so that the fixing height of the cross bars on the pillars can be determined according to the using number of the sample separating sieves, and the sieving device can be better fixed on the vibration disc. The fixing block on the cross rod is matched with the fixing groove on the top cover, so that the fixing between the fixing frame and the screening device is more stable and firm;

(8) the electric push rod and the vibration disc are fixedly connected through the metal spring, on one hand, the force of the electric push rod is indirectly transmitted to the vibration disc through the metal spring, so that partial impact of the electric push rod on the vibration disc is reduced, and the buffer effect is achieved; on the other hand, the electric push rod has certain telescopic allowance due to the existence of the metal spring, so that the fault tolerance rate when the electric push rod is operated to stretch is improved, and the device is safer and more reliable.

In conclusion, the soil screening device is fine and ingenious in structure, is suitable for being used in soil detection and analysis in a laboratory, and is used for screening soil.

Drawings

The invention is described in further detail below with reference to the figures and the embodiments.

FIG. 1 is a schematic overall structure diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of a vibration device according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a screening device according to an embodiment of the present invention;

FIG. 4 is a schematic view of a single sizing screen according to an embodiment of the present invention;

FIG. 5 is a schematic view of another angle configuration of a single sizing screen in accordance with an embodiment of the present invention;

in the figure: 1. a chassis; 2. separating and screening samples; 3. a top cover; 4. an outer housing; 5. an electric push rod; 6. a vibration plate; 7. a metal spring; 8. a pillar; 9. a cross bar; 10. a fixed block; 21. a first fixing plate; 22. a second fixing plate; 23. screening a screen; 24. a discharge port; 25. a limiting block; 26. a limiting groove; 31. and fixing the grooves.

Detailed Description

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the description of the preferred embodiment is only for purposes of illustration and understanding, and is not intended to limit the invention.

Embodiment a soil screening appearance is used in laboratory

As shown in fig. 1, the present embodiment comprises a screening device and a vibrating device combined together, wherein the screening device comprises a base plate 1, at least one sampling screen 2 and a top cover 3 stacked together in sequence from bottom to top; the vibration device comprises an outer shell 4, at least one electric push rod 5, a vibration disc 6 and a fixed frame.

First, screening plant

As shown in fig. 3, the bottom plate 1 and the sample separating sieve 2, two adjacent sample separating sieves 2, and the sample separating sieves 2 and the top cover 3 of the sieving device are all plug-in type connecting structures.

(1) Base plate 1 and top cover 3

The chassis 1 is used for supporting the sample separating screen 2 and collecting the objects screened by the sample separating screen 2 at the bottommost layer. The chassis 1 is square, wherein the top center positions of two opposite side plates of the chassis 1 are provided with limit grooves 26 for limiting and fixing the sample separating screen 2 directly placed on the upper side of the chassis.

The top cover 3 is used for preventing the articles in the uppermost sampling sieve 2 from splashing when in sieving. A handle is arranged at the uppermost end of the top cover 3, and when the sieving condition of the objects in the sample sieve 2 is observed, the handle is convenient to take and place. In order to make the device more secure when it is fixed to the soil screening apparatus, at least one fixing groove 31 is formed on the upper surface of the top cover 3. Preferably, two fixing slots 31 (which can match with a fixing frame in the vibration device) are provided in the present embodiment, and the two fixing slots 31 are respectively located at two sides of the handle.

(2) Sample separating sieve 2

The sample separating screen 2 is used for screening the articles. As shown in fig. 4 and 5, the sample separation sieve 2 includes a fixing frame and a sieve 23 detachably fixed on the bottom of the fixing frame. The fixed frame is composed of four fixed plates which are opposite in pairs and has a square tubular structure. In the present embodiment, two opposite fixing plates are referred to as a first fixing plate 21, and the other two opposite fixing plates are referred to as a second fixing plate 22.

The development shape of the screen 23 is square, and the four edges of the screen 23 are fixedly connected with the inner wall of the fixed frame without gaps; wherein, the screen 23 has two corresponding sides respectively fixed on the first fixed plate 21 of the fixed frame at one third of the height from bottom to top, and the center of the other two corresponding sides of the screen 23 is fixed on the bottom of the second fixed plate 22 of the fixed frame. So that the screen 23 has a projection in the direction perpendicular to the first fixing plate 21 at the bottom of the frame with two sides higher and a middle lower, the screen 23 forms a depression in the bottom of the frame with a V-shaped cross section, similar to a V-shaped cross section, consisting of two inclined planes, and the angle of the inner angle of the depression should be greater than 120 °. Because of the existence of two inclined planes, the sample separating screen 2 is more efficient in screening articles. In order to easily and conveniently take out the screened objects on the screen 23 from the sample separating screen 2, a discharge hole 24 is formed at an equally-divided position corresponding to the size in the horizontal direction at the bottom of one of the fixing frame second fixing plates 22, that is, the discharge hole 24 is arranged at one side of the bottom end of the screen 23. And in order to prevent the leakage of the objects from the discharge port 24 during the sieving, a valve is provided on the discharge port 24.

When dividing appearance sieve 2 and piling up together, can stagger each other for every two adjacent sunken minimum ends that divide appearance sieve 2 screen cloth 23, avoid article to pile up in dividing appearance sieve 2, can not effectual screening processing. In the same set of stacked devices, the bottom of the two fixing plates of the first fixing plate 21 of the fixing frame is also provided with a limiting block 25 corresponding to the equal division position of the horizontal dimension, the limiting block 25 is perpendicular to the side surface of the fixing plate and protrudes outwards, and the top centers of the two fixing plates of the second fixing plate 22 are provided with a limiting groove 26 matched with the limiting block 25. Of course, the top center of the first fixing plate 21 may be provided with a limiting groove 26, and the side bottom center of the second fixing plate 22 may be provided with a limiting block 25. When a plurality of sample sieves 2 are stacked, the relative position between two adjacent sample sieves 2 is always determined and not changed. The apertures of the screen 23 of the sample sieves 2 stacked in sequence are gradually reduced from top to bottom.

The soil detection is divided into various different aspects such as trace metal element detection and organic pollutant detection, so the sample separation sieve 2 is composed of a plastic fixing frame and a nylon screen, or the sample separation sieve 2 is composed of a metal fixing frame and a screen 23.

Second, the vibrator

As shown in fig. 2, an electric push rod 5 of the vibration device is vertically fixed inside the outer shell 4, a vibration plate 6 for placing the screening device is fixedly connected to a power output end of the electric push rod 5, and a fixing frame for fixing the screening device is vertically fixed on an upper surface of the vibration plate 6.

(1) Outer casing 4

The outer shell 4 is similar to a fixed base and has a trapezoidal structure as a whole. The outer shell 4 is made of metal materials, foot pads are arranged at four end points of the bottom of the outer shell for stable placement, and a controller switch is arranged on one side face of the outer shell 4 and used for operating and controlling the vibration device.

(2) Vibration plate 6 and fixing frame

The vibration disc 6 is fixed above the outer shell 4 through an electric push rod 5 and used for placing and fixing the screening device. For better matching and fixing the screening device, two fixing frames are symmetrically and vertically fixedly arranged on the upper surface of the vibration disc 6 with a cuboid structure. Every mount all includes pillar 8 and horizontal pole 9, and horizontal pole 9 threaded connection is in the top of pillar 8 for it is fixed to suppress screening plant. Still be provided with fixed block 10 perpendicularly downwards at the free end of horizontal pole 9, the shape of fixed block 10 and the shape phase-match of fixed slot 31 on the top cap 3 to act on through fixed block 10 and fixed slot 31, make screening plant can be more firm fix shake dish 6 on shake and shake.

(2) Electric push rod 5

The electric push rod 5 drives the vibration plate 6 to vibrate the vibration plate 6. One end of an electric push rod 5 is fixed in the outer shell 4, the other end of the electric push rod is fixedly connected with a vibration disc 6, and the electric push rod 5 is perpendicular to the lower surface of the vibration disc 6 and the bottom surface of the outer shell 4. In order to better control the vibration frequency of the vibration disc 6 and achieve better vibration effect, four electric push rods 5 are arranged on the lower surface of the vibration disc 6 and are respectively positioned at four top points of the bottom surface of the vibration disc 6. The electric push rod 5 and the vibration disc 6 are fixedly connected through the metal spring 7, and partial impact can be reduced in the process that the electric push rod 5 conducts force to the vibration disc 6.

Third, the working process

When using this embodiment, put a plurality of branch appearance sieve 2 on chassis 1 after piling up in proper order according to screen cloth 23 aperture size, then place the device on vibrator's vibrations dish 6, pour the article that need carry out the screening into the branch appearance sieve 2 of the superiors, cover top cap 3 and fix whole branch appearance sieve 2 device on vibrator through vibrator's mount after, open the switch, make the screening plant produce vibrations through the flexible of control electric putter 5 to carry out screening process to article. After the article are screened, the whole screening device is taken down, and then the screened articles are sequentially taken out from the sample separating screen 2 from top to bottom through the discharge hole 24 on the sample separating screen 2, so that the screening treatment of the articles is completed. Of course, it is also possible to tilt the sieving device to one side by controlling two of the electric push rods 5 to be raised and the other two electric push rods 5 to be retracted, so as to take out the objects through the discharge port 24.

Although the present invention has been described in detail with reference to the above embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described above, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a soil screening appearance is used in laboratory, includes screening plant and vibrator, screening plant includes from bottom to top can dismantle chassis, at least one branch appearance sieve and the top cap that sets up in proper order, and from top to bottom piles up a plurality of branch appearance sieves, and the screen cloth aperture diminishes gradually, its characterized in that: the sample separating sieve comprises a fixing frame and a sieve mesh, the fixing frame is of a square cylindrical structure formed by sequentially connecting four vertically arranged fixing plates, two corresponding fixing plates in the fixing frame are first fixing plates, and the other two corresponding fixing plates in the fixing frame are second fixing plates;

2. The laboratory soil screening apparatus of claim 1, wherein: the vibrating device comprises an outer shell, at least one electric push rod, a vibrating disc and a fixing frame, wherein the electric push rod is vertically and fixedly arranged in the outer shell, the power output end of the electric push rod is fixedly connected with the vibrating disc used for placing the screening device, and the fixing frame is vertically and fixedly arranged on the upper surface of the vibrating disc.

3. The laboratory soil screening apparatus of claim 2, wherein: the vibration plate is of a cuboid structure, four vertexes of the lower surface of the vibration plate are connected with the power output end of an electric push rod respectively, and the electric push rod is fixedly connected with the vibration plate through a metal spring.

4. The laboratory soil screening apparatus of claim 3, wherein: the fixing frame comprises a support and a cross rod in threaded connection with the top of the support, and a vertical downward fixing block is fixedly arranged at the free end of the cross rod.

5. The laboratory soil screening apparatus of any one of claims 1 to 4, wherein: the base plate is connected with the sample separating sieve, the two adjacent sample separating sieves are connected with the top cover, and the sample separating sieves and the top cover are connected in a plug-in mode.

6. The laboratory soil screening apparatus of claim 5, wherein: the top of each second fixing plate is provided with a limiting groove corresponding to the equal division position of the size in the horizontal direction, and the bottom of the side surface of the first fixing plate is provided with a limiting block matched with the limiting groove.

7. The laboratory soil screening apparatus of claim 5, wherein: the top of each first fixing plate is provided with a limiting groove corresponding to the equal division position of the size in the horizontal direction, and the bottom of the side surface of each second fixing plate is provided with a limiting block matched with the limiting groove.

8. The laboratory soil screening apparatus of claim 6 or 7, wherein: the screen cloth is detachably and fixedly connected to the fixed frame.

9. The laboratory soil screening apparatus of claim 8, wherein: the sample separating sieve is made of any one of the following materials:

A. the fixing frame is made of plastic, and the screen is made of nylon;

B. the fixing frame and the screen are made of metal.

10. The laboratory soil screening apparatus of claim 9, wherein: the top cover is provided with at least one fixing groove which is convenient for fixing the sample separating screen on the vibration device, and the fixing groove is matched with the fixing block on the cross rod of the fixing frame.