CN220120637U

CN220120637U - Circulating feeding device for laser particle size distribution instrument

Info

Publication number: CN220120637U
Application number: CN202321138135.5U
Authority: CN
Inventors: 王银木; 戢运云
Original assignee: Suzhou You Mineral Plastics New Materials Co ltd
Current assignee: Suzhou You Mineral Plastics New Materials Co ltd
Priority date: 2023-05-12
Filing date: 2023-05-12
Publication date: 2023-12-01
Anticipated expiration: 2033-05-12

Abstract

The utility model discloses a circulating feeding device for a laser particle size distribution instrument, which belongs to the field of optical measuring instruments and comprises a cylinder body, wherein a cover plate component for sealing the cylinder body is arranged on the cylinder body; the cover plate component is provided with a rotary stirring component for stirring the product; the cylinder body is provided with a circulating assembly for circulating the mixed solution; the cover plate assembly comprises a circular plate, a guide assembly, a limiting assembly, a feeding assembly, a water inlet assembly, an exhaust pipe, a supporting seat and a handle, wherein the top of the cylinder body is in fit connection with the bottom of the circular plate, the diameter of the circular plate is larger than that of the cylinder body, and the exhaust pipe is fixedly connected with the top of the circular plate; air in the cylinder body is discharged through the exhaust pipe, so that the effect of removing bubbles is achieved, and the detection precision is improved.

Description

Circulating feeding device for laser particle size distribution instrument

Technical Field

The utility model relates to the field of optical measuring instruments, in particular to a circulating feeding device for a laser particle size distribution instrument.

Background

The circulating feeding device is a part of the laser particle size distribution instrument, the circulating feeding device is mainly used for stirring a product to be detected, the stirred mixed solution enters a laser detection chamber through a pipeline to be detected, the circulating feeding device is required to be cleaned after detection is completed, manual disassembly is required to clean the pipeline, and the process is complex.

A laser particle size analyzer in the prior art, for example CN202020375481.5 of the chinese utility model, comprises a laser particle size analyzer and a circulating sample feeder, wherein the circulating sample feeder comprises a sample cup, a stirrer extending into the sample cup, a liquid inlet pipeline and a return pipeline, one end of the liquid inlet pipeline is connected with the sample cup, the other end is connected with an inlet of the laser particle size analyzer, and an infusion pump is arranged on the liquid inlet pipeline; the circulating sample feeding machine further comprises a spray head, a clear water conveying pipeline, a liquid discharging pipeline and a four-way reversing valve, wherein the spray head is arranged above the sample cup and sprays water downwards, one end of the return pipeline is connected with an outlet of the laser particle size analyzer, the other end of the return pipeline, the clear water conveying pipeline, the liquid discharging pipeline and the spray head are respectively connected with four connecting ports of the four-way reversing valve, and the clear water conveying pipeline is communicated with an external water supply system.

However, the above-mentioned laser particle size analyzer has the problem that the sample cup is opened, so that external contaminants easily enter the sample cup to contact with the product to be detected, thereby affecting the detection accuracy; and then, bubbles can be generated when the stirrer stirs, and the generated bubbles can flow into the laser detection chamber together, so that the detection precision can be influenced.

Based on the above, the utility model designs a circulating feeding device for a laser particle size distribution instrument to solve the above problems.

Disclosure of Invention

Aiming at the defects existing in the prior art, the utility model provides a circulating feeding device for a laser particle size distribution instrument.

In order to achieve the above purpose, the utility model is realized by the following technical scheme:

the circulating feeding device for the laser particle size distribution instrument comprises a cylinder body, wherein a cover plate component for sealing the cylinder body is arranged on the cylinder body;

the cover plate component is provided with a rotary stirring component for stirring the product;

the cylinder body is provided with a circulating assembly for circulating the mixed solution;

the cover plate assembly comprises a circular plate, a guide assembly, a limiting assembly, a feeding assembly, a water inlet assembly, an exhaust pipe, a supporting seat and a handle, wherein the top of the cylinder body is connected with the bottom of the circular plate in a fit mode, the diameter of the circular plate is larger than that of the cylinder body, the top of the circular plate is fixedly connected with the supporting seat, the feeding assembly, the water inlet assembly and the exhaust pipe are respectively connected with the top of the circular plate, the guide assembly is arranged at the bottom of the circular plate, the limiting assembly is connected with the guide assembly, and the handles are respectively fixedly arranged on two sides of the circular plate.

Still further, the direction subassembly includes guide bar, annular plate and first circular hole, the inner wall of annular plate and the outer wall fixed connection of barrel to the annular plate is located the below of annular plate, and equidistant fixed mounting of the one end of a plurality of groups guide bars is in the bottom of annular plate with the mode of circumference array, and the outer wall of guide bar and the outer wall of barrel do not contact, first circular hole has been seted up at the top of annular plate, and the position of first circular hole corresponds with the position of guide bar, the guide bar passes through first circular hole and annular plate laminating sliding connection.

Still further, spacing subassembly includes first straight board, gag lever post, spring and second circular hole, the second circular hole has been seted up to the outer wall around the annular board, and second circular hole and first circular hole intercommunication, gag lever post and second circular hole laminating sliding connection, one end and one side fixed connection of first straight board of gag lever post, the other end and the guide bar laminating of gag lever post are connected, one end and one side fixed connection of first straight board of spring, the other end and the outer wall fixed connection of annular board of spring, and the inside of spring has the gag lever post to pass.

Still further, the feeding subassembly includes feeder hopper and apron, feeder hopper fixed mounting is at the top of circular plate, and the feeder hopper is located the back of supporting seat, the apron rotates the top of installing at the feeder hopper.

Still further, the subassembly of intaking includes inlet tube, annular pipe and shower nozzle, the top fixed mounting of circular plate has the inlet tube, the inlet tube is located the right side of supporting seat.

Furthermore, the bottom of circular plate fixed mounting has the annular pipe, and the external diameter of annular pipe is less than the internal diameter of barrel, the bottom of annular pipe is equidistant fixed mounting in the form of circumference array has a plurality of groups shower nozzles, the one end and the annular pipe of inlet tube link up and be connected.

Still further, the rotation stirring subassembly includes drive assembly and stirring subassembly, drive assembly is connected with the supporting seat, stirring subassembly is connected with drive assembly.

Still further, the drive assembly includes motor and shaft coupling, motor fixed mounting is at the top of supporting seat, the one end of shaft coupling is fixed connection with the output of motor, and the other end of shaft coupling is connected with stirring assembly.

Still further, stirring subassembly includes pivot, the straight board of second, scraper blade and the straight board of third, pivot and circular plate center rotate and are connected, the one end of pivot and the other end fixed connection of shaft coupling, the pivot is located the inside center of barrel, the other end of pivot is equidistant fixed mounting with a plurality of groups of straight boards of third in circular array's form, and the other end of pivot and the bottom of barrel contactless, one side of scraper blade and the inner wall laminating sliding connection of barrel and the shape of scraper blade are unanimous with the inner wall shape of barrel completely, the opposite side of scraper blade and the one end fixed connection of the straight board of second, the other end and the pivot fixed connection of the straight board of second.

Still further, the circulation subassembly includes back flow, electronic three-way valve, feed liquor pipe and blow off pipe, back flow fixed mounting is in one side of barrel, feed liquor pipe and blow off pipe respectively with the front and back both ends fixed connection of electronic three-way valve, the upper end of electronic three-way valve and the bottom fixed connection of barrel.

Advantageous effects

The utility model relates to capsule tightness detection equipment, which can seal a cylinder body through a cover plate assembly, stir a product through rotating a stirring assembly, recycle the mixed solution through a circulating assembly, close the cylinder body through a cover plate, enable the cover plate to be stably closed with the cylinder body through a guide assembly, limit the guide assembly through a limit assembly, add the product into the cylinder through a feeding assembly, add water into the cylinder through a water inlet assembly, discharge gas in the cylinder through an exhaust pipe, and greatly reduce the external pollutants from entering the cylinder body due to the fact that the traditional stirring vessel is open at one end, contact with the detected product and generate bubbles when the mixed solution of the product is stirred, greatly improve the precision of the product to be detected, and ensure that the air in the cylinder body is pumped out through the exhaust pipe, so that the bubbles are not generated when the mixed solution of the product is stirred, and the detection precision is improved.

Compared with the traditional method of directly cleaning the cylinder by stirring clean water with stirring blades, the utility model has the advantage that the scraping plate can remove stubborn stains attached to the cylinder wall.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It is evident that the drawings in the following description are only some embodiments of the present utility model and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a perspective view of a circulating feeding device for a laser particle size distribution instrument;

FIG. 2 is a front view of a circulating feeding device for a laser particle size distribution instrument;

FIG. 3 is a right side view of a circular feeding device for a laser particle size distribution instrument according to the present utility model;

FIG. 4 is a second perspective view of the structure of a circulating feeding device for a laser particle size distribution instrument;

FIG. 5 is a cross-sectional view taken along the direction A-A of FIG. 2;

FIG. 6 is a cross-sectional view taken along the B-B direction of FIG. 3;

fig. 7 is an enlarged view at C in fig. 1.

Reference numerals in the drawings represent respectively:

1. a cylinder; 2. a cover plate assembly; 21. a circular plate; 22. a guide assembly; 221. a guide rod; 222. an annular plate; 223. a first circular hole; 23. a limit component; 231. a first straight plate; 232. a limit rod; 233. a spring; 234. a second circular hole; 24. a feed assembly; 241. a feed hopper; 242. a cover plate; 25. a water inlet assembly; 251. a water inlet pipe; 252. an annular tube; 253. a spray head; 26. an exhaust pipe; 27. a support base; 28. a grip; 3. rotating the stirring assembly; 31. a drive assembly; 311. a motor; 312. a coupling; 32. a stirring assembly; 321. a rotating shaft; 322. a second straight plate; 323. a scraper; 324. a third straight plate; 4. a circulation assembly; 41. a return pipe; 42. an electric three-way valve; 43. a liquid inlet pipe; 44. and a blow-down pipe.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model is further described below with reference to examples.

Example 1

Referring to the accompanying drawings 1-7 of the specification, a circulating feeding device for a laser particle size distribution instrument comprises a cylinder 1; the cylinder 1 is provided with a cover plate component 2 for sealing the cylinder 1;

the cover plate assembly 2 comprises a circular plate 21, a guide assembly 22, a limiting assembly 23, a feeding assembly 24, a water inlet assembly 25, an exhaust pipe 26, a supporting seat 27 and a grip 28, wherein the top of the cylinder 1 is in fit connection with the bottom of the circular plate 21, the diameter of the circular plate 21 is larger than that of the cylinder 1, the top of the circular plate 21 is fixedly connected with the supporting seat 27, the feeding assembly 24, the water inlet assembly 25 and the exhaust pipe 26 are respectively connected with the top of the circular plate 21, the guide assembly 22 is arranged at the bottom of the circular plate 21, the limiting assembly 23 is connected with the guide assembly 22, and the grips 28 are respectively fixedly arranged at two sides of the circular plate 21;

firstly, a circular plate 21 can be moved downwards through a handle 28, the circular plate 21 is attached to the top of a cylinder 1 through a guide component 22, the guide component 22 is limited by a limiting component 23, after the cylinder 1 is covered with the circular plate 21, a product is sent into the cylinder 1 through a feeding component 24, then water is sent into the cylinder 1 through a water inlet component 25, air in the cylinder 1 is pumped out through an exhaust pipe 26 to form a sealed space, a rotating stirring component 3 is opened to stir and mix the product, after the completion of the stirring, the mixed solution enters a laser detection chamber from a circulating component 4, after the completion of the detection, the mixed solution enters the cylinder 1 from the circulating component 4 for recycling, and finally clear water is added into the cylinder 1 through the water inlet component 25, so that the circulating component 4 and the cylinder 1 are cleaned;

the traditional stirring vessel is one end open-ended, can cause external pollutant and detect the product contact and can have the bubble production when stirring product mixed solution, so the setting of circular plate 21 significantly reduces external pollutant and gets into in the barrel 1, improves the precision of waiting to detect the product greatly, and the rethread blast pipe 26 evacuates the air in the barrel 1, does not produce the bubble when reaching stirring product mixed solution, has also improved the accuracy of detection.

The guide assembly 22 comprises a guide rod 221, an annular plate 222 and a first circular hole 223, wherein the inner wall of the annular plate 222 is fixedly connected with the outer wall of the cylinder body 1, the annular plate 222 is positioned below the circular plate 21, one ends of a plurality of groups of guide rods 221 are fixedly arranged at the bottom of the circular plate 21 in a circumferential array mode at equal intervals, the outer wall of the guide rod 221 is not contacted with the outer wall of the cylinder body 1, the first circular hole 223 is formed in the top of the annular plate 222, the position of the first circular hole 223 corresponds to the position of the guide rod 221, and the guide rod 221 is in fit sliding connection with the annular plate 222 through the first circular hole 223;

firstly, the circular plate 21 can be moved downwards through the handle 28, the circular plate 21 slides downwards through the guide rod 221 along the first circular hole 223 formed in the annular plate 222, the circular plate 21 is in fit connection with the top of the cylinder 1, the guide component 22 is limited by the limiting component 23, after the cylinder 1 is covered with the circular plate 21, a product is sent into the cylinder 1 through the feeding component 24, then water is sent into the cylinder 1 through the water inlet component 25, air in the cylinder 1 is pumped out through the exhaust pipe 26 to form a sealed space, the rotating stirring component 3 is opened to stir and mix the product, after the mixed solution is detected, the mixed solution enters the laser detection chamber through the circulating component 4, the mixed solution enters the cylinder 1 again, the mixed solution is recycled, and finally clear water is added into the cylinder 1 through the water inlet component 25, and the circulating component 4 and the cylinder 1 are cleaned;

the guide bar 221 is installed to make the circular plate 21 more stable and free from random swaying when moving up and down.

The limiting assembly 23 comprises a first straight plate 231, a limiting rod 232, a spring 233 and a second circular hole 234, wherein the second circular hole 234 is formed in the peripheral outer wall of the annular plate 222, the second circular hole 234 is communicated with the first circular hole 223, the limiting rod 232 is in fit sliding connection with the second circular hole 234, one end of the limiting rod 232 is fixedly connected with one side of the first straight plate 231, the other end of the limiting rod 232 is in fit connection with the guide rod 221, one end of the spring 233 is fixedly connected with one side of the first straight plate 231, the other end of the spring 233 is fixedly connected with the outer wall of the annular plate 222, and the limiting rod 232 penetrates through the inside of the spring 233;

firstly, the circular plate 21 can be moved downwards through the handle 28, the circular plate 21 slides downwards along the first circular hole 223 formed in the annular plate 222 through the guide rod 221, the first straight plate 231 is pulled outwards, the spring 233 and the limiting rod 232 move outwards together, the guide rod 221 can pass through the first circular hole 223, after the guide rod 221 passes through the first circular hole 223, the first straight plate 231 is loosened, the limiting rod 232 is pressed into the first circular hole 223 through resilience of the spring 233, and limiting fixation is carried out on the guide rod 221.

The feeding assembly 24 comprises a feeding hopper 241 and a cover plate 242, the feeding hopper 241 is fixedly installed on the top of the circular plate 21, the feeding hopper 241 is positioned behind the supporting seat 27, and the cover plate 242 is rotatably installed on the top of the feeding hopper 241;

the cover plate 242 is opened, a product is placed into the cylinder 1 through the feed hopper 241, then water is sent into the cylinder 1 through the water inlet assembly 25, air in the cylinder 1 is pumped out through the exhaust pipe 26 to form a sealed space, the rotary stirring assembly 3 is opened to stir and mix the product, and the finished mixed solution enters the laser detection chamber through the circulating assembly 4 to be detected.

The water inlet assembly 25 comprises a water inlet pipe 251, an annular pipe 252 and spray heads 253, wherein the water inlet pipe 251 is fixedly arranged at the top of the circular plate 21, the water inlet pipe 251 is positioned at the right side of the supporting seat 27, the annular pipe 252 is fixedly arranged at the bottom of the circular plate 21, the outer diameter of the annular pipe 252 is smaller than the inner diameter of the cylinder body 1, a plurality of groups of spray heads 253 are fixedly arranged at equal intervals at the bottom of the annular pipe 252 in a circumferential array mode, and one end of the water inlet pipe 251 is in through connection with the annular pipe 252;

opening a cover plate 242, putting a product into the cylinder 1 through the feed hopper 241, feeding clean water into the annular pipe 252 through the water inlet pipe 251, uniformly spraying the clean water in the annular pipe 252 on the inner wall of the cylinder 1 through the spray nozzle 253, evacuating air in the cylinder 1 through the exhaust pipe 26 to form a sealed space, opening the rotary stirring assembly 3 to stir and mix the product, and allowing the completed mixed solution to enter the laser detection chamber through the circulating assembly 4 for detection;

through the installation shower nozzle 253, not only can the efficient cooperation rotate stirring subassembly 3 wash the inner wall of barrel 1, can also evenly spray the inner wall of barrel 1 with the clear water, the clear water reduces the bubble and produces along the bottom of the inner wall inflow barrel 1 of barrel 1.

The cover plate assembly 2 is provided with a rotary stirring assembly 3 for stirring products;

the rotary stirring assembly 3 comprises a driving assembly 31 and a stirring assembly 32, the driving assembly 31 is connected with the supporting seat 27, and the stirring assembly 32 is connected with the driving assembly 31;

the driving component 31 is opened, the driving component 31 drives the stirring component 32 to rotate, the product and the water in the cylinder body 1 are stirred, and the finished mixed solution enters the laser detection chamber for detection through the circulating component 4.

The driving assembly 31 comprises a motor 311 and a coupler 312, the motor 311 is fixedly arranged at the top of the supporting seat 27, one end of the coupler 312 is fixedly connected with the output end of the motor 311, and the other end of the coupler 312 is connected with the stirring assembly 32;

the motor 311 is turned on, the motor 311 drives the stirring assembly 32 to rotate through the coupler 312, the product and water in the cylinder 1 are stirred, and the finished mixed solution enters the laser detection chamber for detection through the circulation assembly 4.

The cylinder body 1 is provided with a circulating assembly 4 for circulating the mixed solution;

after the cylinder 1 is covered with the circular plate 21, products are fed into the cylinder 1 through the feeding hopper 241, water is fed into the cylinder 1 through the spray nozzle 253, air in the cylinder 1 is pumped out through the exhaust pipe 26 to form a sealed space, the rotary stirring assembly 3 is opened to stir and mix the products, the mixed solution is fed into the laser detection chamber through the circulating assembly 4, and after detection, the mixed solution enters the cylinder 1 through the circulating assembly 4 again, so that recycling is realized.

Example 2

On the basis of embodiment 1, referring to fig. 1-7, the stirring assembly 32 includes a rotating shaft 321, a second straight plate 322, a scraping plate 323 and a third straight plate 324, wherein the rotating shaft 321 is rotationally connected with the center of the circular plate 21, one end of the rotating shaft 321 is fixedly connected with the other end of the coupling 312, the rotating shaft 321 is positioned at the inner center of the cylinder 1, a plurality of groups of third straight plates 324 are fixedly arranged at equal intervals on the other end of the rotating shaft 321 in a circular array mode, the other end of the rotating shaft 321 is not contacted with the bottom of the cylinder 1, one side of the scraping plate 323 is in fit sliding connection with the inner wall of the cylinder 1, the shape of the scraping plate 323 is completely consistent with the shape of the inner wall of the cylinder 1, the other side of the scraping plate 323 is fixedly connected with one end of the second straight plate 322, and the other end of the second straight plate 322 is fixedly connected with the rotating shaft 321;

turning on the motor 311, driving the rotating shaft 321 to rotate by the motor 311 through the coupler 312, respectively driving the third straight plate 324 and the scraping plate 323 connected with the second straight plate 322 to rotate by the rotating shaft 321, stirring the product and water in the cylinder 1, detecting the finished mixed solution in the laser detection chamber by the circulating assembly 4, sprinkling water on the inner wall of the cylinder 1 through the spray head 253 after the detection is finished, and cleaning the inner wall of the cylinder 1 by driving the scraping plate 323 by the rotating shaft 321;

compared with the conventional method of directly stirring clean water with stirring blades to clean the cylinder 1, the scraper 323 can remove stubborn stains attached to the cylinder wall.

Example 3

On the basis of embodiment 2, referring to fig. 1-7, the circulation assembly 4 comprises a return pipe 41, an electric three-way valve 42, a liquid inlet pipe 43 and a drain pipe 44, wherein the return pipe 41 is fixedly arranged on one side of the cylinder 1, the liquid inlet pipe 43 and the drain pipe 44 are respectively and fixedly connected with the front end and the rear end of the electric three-way valve 42, and the upper end of the electric three-way valve 42 is fixedly connected with the bottom of the cylinder 1;

after the cylinder 1 is covered with the circular plate 21, products are fed into the cylinder 1 through the feeding hopper 241, water is fed into the cylinder 1 through the spray nozzle 253, air in the cylinder 1 is pumped out through the exhaust pipe 26 to form a sealed space, the motor 311 is turned on to drive the rotating shaft 321 to stir and mix the products, the valve of the liquid inlet pipe 43 is opened, the mixed solution enters the laser detection chamber through the liquid inlet pipe 43, after detection, the mixed solution enters the cylinder 1 through the return pipe 41 again, recycling is achieved, clear water is finally added into the cylinder 1, the liquid inlet pipe 43, the return pipe 41 and the cylinder 1 are cleaned, the valve of the liquid inlet pipe 43 is closed to open the valve of the sewage drain pipe 44, and sewage is discharged through the sewage drain pipe 44.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. The utility model provides a laser particle size distribution is circulation feed arrangement for appearance, includes barrel (1), its characterized in that:

the cylinder (1) is provided with a cover plate component (2) for sealing the cylinder (1);

the cover plate assembly (2) is provided with a rotary stirring assembly (3) for stirring products;

a circulation assembly (4) for circulating the mixed solution is arranged on the cylinder (1);

the cover plate assembly (2) comprises a circular plate (21), a guide assembly (22), a limiting assembly (23), a feeding assembly (24), a water inlet assembly (25), an exhaust pipe (26), a supporting seat (27) and a handle (28), wherein the top of the cylinder body (1) is connected with the bottom of the circular plate (21) in a fitting mode, the diameter of the circular plate (21) is larger than that of the cylinder body (1), the top of the circular plate (21) is fixedly connected with the supporting seat (27), the feeding assembly (24), the water inlet assembly (25) and the exhaust pipe (26) are respectively connected with the top of the circular plate (21), the guide assembly (22) is installed at the bottom of the circular plate (21), and the limiting assembly (23) is connected with the guide assembly (22), and the handles (28) are respectively fixedly installed on two sides of the circular plate (21).

2. The circulating feeding device for the laser particle size distribution instrument according to claim 1, wherein the guide assembly (22) comprises a guide rod (221), an annular plate (222) and a first circular hole (223), the inner wall of the annular plate (222) is fixedly connected with the outer wall of the cylinder body (1), the annular plate (222) is positioned below the circular plate (21), one ends of a plurality of groups of guide rods (221) are fixedly arranged at the bottom of the circular plate (21) at equal intervals in a circumferential array mode, the outer wall of the guide rod (221) is not contacted with the outer wall of the cylinder body (1), the first circular hole (223) is formed in the top of the annular plate (222), the position of the first circular hole (223) corresponds to the position of the guide rod (221), and the guide rod (221) is in fit sliding connection with the annular plate (222) through the first circular hole (223).

3. The circulating feeding device for the laser particle size distribution instrument according to claim 2, wherein the limiting component (23) comprises a first straight plate (231), a limiting rod (232), a spring (233) and a second circular hole (234), the second circular hole (234) is formed in the peripheral outer wall of the annular plate (222), the second circular hole (234) is communicated with the first circular hole (223), the limiting rod (232) is in fit sliding connection with the second circular hole (234), one end of the limiting rod (232) is fixedly connected with one side of the first straight plate (231), the other end of the limiting rod (232) is in fit connection with the guide rod (221), one end of the spring (233) is fixedly connected with one side of the first straight plate (231), the other end of the spring (233) is fixedly connected with the outer wall of the annular plate (222), and the limiting rod (232) penetrates through the inside of the spring (233).

4. The circulating feed apparatus for a laser particle size distribution apparatus according to claim 1, wherein the feed assembly (24) comprises a feed hopper (241) and a cover plate (242), the feed hopper (241) is fixedly installed on top of the circular plate (21), the feed hopper (241) is located behind the support base (27), and the cover plate (242) is rotatably installed on top of the feed hopper (241).

5. The circulating feeding device for the laser particle size distribution instrument according to claim 1, wherein the water inlet assembly (25) comprises a water inlet pipe (251), an annular pipe (252) and a spray head (253), the water inlet pipe (251) is fixedly arranged at the top of the circular plate (21), and the water inlet pipe (251) is positioned on the right side of the supporting seat (27).

6. The circulating feed apparatus for a laser particle size distribution apparatus according to claim 5, wherein the circular plate (21) is fixedly provided with a circular pipe (252) at the bottom thereof, the outer diameter of the circular pipe (252) is smaller than the inner diameter of the cylinder (1), the bottom of the circular pipe (252) is fixedly provided with a plurality of groups of spray heads (253) at equal intervals in a circumferential array, and one end of the water inlet pipe (251) is connected with the circular pipe (252) in a penetrating manner.

7. The circulating feeding device for the laser particle size distribution instrument according to claim 1, wherein the rotary stirring assembly (3) comprises a driving assembly (31) and a stirring assembly (32), the driving assembly (31) is connected with the supporting seat (27), and the stirring assembly (32) is connected with the driving assembly (31).

8. The circulating feeding device for the laser particle size distribution instrument according to claim 7, wherein the driving assembly (31) comprises a motor (311) and a coupler (312), the motor (311) is fixedly arranged at the top of the supporting seat (27), one end of the coupler (312) is fixedly connected with the output end of the motor (311), and the other end of the coupler (312) is connected with the stirring assembly (32).

9. The circulating feeding device for the laser particle size distribution instrument according to claim 8, wherein the stirring assembly (32) comprises a rotating shaft (321), a second straight plate (322), a scraping plate (323) and a third straight plate (324), the rotating shaft (321) is rotationally connected with the center of the circular plate (21), one end of the rotating shaft (321) is fixedly connected with the other end of the coupler (312), the rotating shaft (321) is positioned at the inner center of the cylinder (1), a plurality of groups of third straight plates (324) are fixedly arranged at the other end of the rotating shaft (321) at equal intervals in a circular array mode, the other end of the rotating shaft (321) is not contacted with the bottom of the cylinder (1), one side of the scraping plate (323) is in fit sliding connection with the inner wall of the cylinder (1), the shape of the scraping plate (323) is completely consistent with the shape of the inner wall of the cylinder (1), the other side of the scraping plate (323) is fixedly connected with one end of the second straight plate (322), and the other end of the second straight plate (322) is fixedly connected with the rotating shaft (321).

10. The circulating feeding device for the laser particle size distribution instrument according to claim 1, wherein the circulating assembly (4) comprises a return pipe (41), an electric three-way valve (42), a liquid inlet pipe (43) and a drain pipe (44), the return pipe (41) is fixedly arranged on one side of the cylinder body (1), the liquid inlet pipe (43) and the drain pipe (44) are respectively fixedly connected with the front end and the rear end of the electric three-way valve (42), and the upper end of the electric three-way valve (42) is fixedly connected with the bottom of the cylinder body (1).