CN111001350B

CN111001350B - Full-automatic rock-like sample stirring machine capable of preventing dust from being stirred uniformly and stirring method

Info

Publication number: CN111001350B
Application number: CN202010014782.XA
Authority: CN
Inventors: 史振宁; 段鑫波; 付宏渊; 戚双星; 曾铃
Original assignee: Changsha University of Science and Technology
Current assignee: Changsha University of Science and Technology
Priority date: 2020-01-07
Filing date: 2020-01-07
Publication date: 2021-12-21
Anticipated expiration: 2040-01-07
Also published as: CN111001350A

Abstract

The invention discloses a fully automatic rock-like sample mixer and a mixing method for preventing dust from stirring uniformly. The mixer includes a support for supporting and fixing a cylinder body, a pressure boosting/pressure relief valve is arranged on the top of the cylinder body, and a middle part of the cylinder body is provided. A rotating shaft is installed on the axis, and the upper end of the rotating shaft is connected with the output shaft of the rotating motor. The rotating shaft is respectively fixed with a stirring device and a threaded agitator from top to bottom. The inclined direction of the fan blades of the threaded agitator is opposite to that of the stirring device. The top of the cylinder is provided with a solid storage hopper, an annular nozzle is installed on the inner wall of the cylinder between the threaded agitator and the stirring device, and the discharge port is located in the center of the bottom of the cylinder; control sensor. The mixer of the invention prevents dust from escaping, can improve mixing uniformity and prevent powder lumps in the mixing process, realizes the automatic integration of feeding and mixing, improves sample preparation efficiency and accuracy, reduces sample residues, and ensures sample quality.

Description

Full-automatic rock-like sample stirring machine capable of preventing dust from being stirred uniformly and stirring method

Technical Field

The invention belongs to the technical field of rock mechanics test devices, and relates to a full-automatic rock-like sample stirring machine capable of preventing dust from being stirred uniformly and a stirring method.

Background

In the process of researching the physical mechanics of rock mass, because natural rock mass has the defects of cracks, joints and the like, the sampling cost is high, the manufacturing efficiency is low, and the problems of great randomness and the like exist, the preparation of rock-like samples is often adopted to simulate the research of original rock materials. In order to simulate a real rock body with a wide intensity variation range, a rock-like similar model material with a wide variation range of physical and mechanical properties and stable and controllable performance needs to be developed. Besides selecting proper similar materials, the method also has to strictly control the mixing uniformity of materials in the sample preparation process, which plays a key role in the success of similar model tests. In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art: the problem of uneven mixing and stirring of different materials often occurs in the stirring process of adopting different stirring equipment, and the phenomena of local over-wetting or over-drying and powder agglomeration occur in the liquid adding process, so that the prepared sample has inherent defects, and the obtained sample cannot meet or does not meet the experimental requirements.

At present, the materials are mainly stirred by a common concrete stirrer or a manual stirring method in the process of manufacturing the rock-like sample. No matter what stirring method is adopted, a large amount of dust particles fly out in the stirring process, and a large amount of materials are attached to stirring equipment after liquid is added and stirred, so that certain material loss is caused; meanwhile, the phenomena of uneven stirring, agglomeration and the like can occur in the stirring process, so that the prepared sample has certain difference necessarily, and the accuracy of a similar material model test is directly influenced; simultaneously, in the stirring process, the feeding quality, the stirring uniformity and the stirring time can not be accurately controlled, and the sample preparation efficiency and precision are influenced.

Disclosure of Invention

In order to solve the problems, the invention provides a full-automatic rock sample stirrer capable of preventing dust from being stirred uniformly, which can prevent dust from escaping, improve the stirring uniformity and prevent powder lumps in the stirring process, realize full-automatic integration of feeding and stirring, improve the sample preparation efficiency and precision, ensure the sample quality, reduce the sample residue and solve the problems in the prior art.

The invention also aims to provide a stirring method of the full-automatic rock-like sample stirrer for preventing dust and uniformly stirring.

The invention adopts the technical scheme that the full-automatic rock sample stirrer capable of preventing dust and stirring uniformly comprises a support for supporting and fixing a cylinder body, wherein a closed cavity is arranged in the cylinder body, a pressure boosting/relieving valve is arranged at the top of the cylinder body, a rotating shaft is arranged on a central axis of the cylinder body, the upper end of the rotating shaft is connected with an output shaft of a rotating motor, a stirring device and a threaded stirrer are respectively fixed on the rotating shaft from top to bottom, a hollow cavity is arranged in the center of the rotating shaft, a plurality of round holes communicated with the hollow cavity are uniformly distributed on the rotating shaft between adjacent fan blades of the threaded stirrer, the inclination direction of the fan blades of the threaded stirrer is opposite to the inclination direction of the stirring device, the axial thrust generated by the threaded stirrer is smaller than that generated by the stirring device, a solid storage hopper is arranged at the top of the cylinder body, and an annular spray head is arranged on the inner wall of the cylinder body between the threaded stirrer and the stirring device, the outer wall of the cylinder body corresponding to the annular nozzle is provided with a liquid pressurization control device, the liquid pressurization control device is communicated with the annular nozzle, the liquid pressurization control device is communicated with a liquid storage hopper through a hose, and the discharge hole is formed in the center of the bottom of the cylinder body; the electronic control sensor for solid particles is arranged in the position, close to the stirring device, in the barrel, the moisture content sensor is arranged near the discharge port, the electronic control sensor for solid particles and the moisture content sensor are respectively in signal connection with a computer, the computer is electrically connected with a rotating motor, and the computer is electrically connected with a driving device for a solid storage hopper, the discharge port and a pressurizing/depressurizing valve.

Furthermore, the bottom of the cylinder is in a circular truncated cone shape, an included angle between a bus of the circular truncated cone and the bottom surface is 45-60 degrees, the stirrer is installed at the bottom of the cylinder and fixedly connected with a telescopic head of the electric push rod, a main body of the electric push rod is hermetically installed in the rotating shaft, and the electric push rod is electrically connected with the computer; a detachable round hole sieve is horizontally arranged between the threaded stirrer and the stirrer; the stirrer consists of two triangular first stirring wires and two triangular second stirring wires, the first stirring wires and the second stirring wires are perpendicular to each other, scrapers are installed at positions, close to the inner wall of the bottom of the barrel, of the first stirring wires and the second stirring wires, the inclination angles of the scrapers are the same as those of the inner wall of the bottom of the barrel, the installation positions of the scrapers on the first stirring wires and the second stirring wires are different, and the working areas on the inner wall of the barrel are partially overlapped.

Furthermore, the blades of the stirring device are horizontally or vertically arranged long-strip-shaped blades, the number of the blades is 2-4, and the blades are symmetrically arranged on the rotating shaft; the range of the inclination angle of the fan blades of the threaded stirrer is 30-45 degrees, and a conical sharp-angle bulge is arranged in the middle of each layer of fan blades of the threaded stirrer.

Furthermore, the annular nozzle is close to the same hole of each size of barrel inner wall evenly distributed one side, and liquid pressurization controlling means and annular nozzle through hole realize the intercommunication, and the annular nozzle is kept away from barrel inner wall one side and is equipped with round platform shape orifice, and the generating line of round platform shape orifice is 30 with the barrel inner wall contained angle.

Furthermore, the liquid storage hopper is sequentially provided with a storage cavity, a control cavity and a mixing bin from top to bottom, a vertically arranged liquid feeding bin partition plate divides the storage cavity into a plurality of liquid storage bins, a control channel is arranged in the control cavity, each liquid storage bin is communicated with the mixing bin through a corresponding control channel, an electric control switch is arranged in each control channel, a sensing probe of a pressure sensing electric control element extends into the corresponding liquid storage bin, a main body of the pressure sensing electric control element is arranged in the control cavity, the pressure sensing electric control element is electrically connected with a computer, the computer is electrically connected with the electric control switch, and the computer is used for controlling the corresponding electric control switch to be turned on or turned off according to feedback information of the pressure sensing electric control element; the mixing bin is communicated with a liquid pressurization control device through a hose.

Further, an air pressure measuring instrument is installed in the cylinder, the pressure boosting/reducing valve is connected with the air pressure pumping device, a controller is installed in the air pressure pumping device, the air pressure measuring instrument and the controller are both electrically connected with a computer, and the computer is used for controlling the pressure pumping speed according to feedback information of the air pressure measuring instrument.

Further, a feeding hole is formed in the bottom of the solid storage hopper, a hopper cover is installed at the feeding hole, a weighing sensor is arranged in the solid feeding control device, the output end of the weighing sensor is connected with a computer, the computer is connected with a driving device of the hopper cover and used for controlling the driving device of the hopper cover according to information fed back by the weighing sensor, and the computer is used for controlling the opening and closing of the hopper cover according to the information fed back by the weighing sensor; the liquid pressurization control device is electrically connected with the computer; the discharge port is provided with a valve which is electrically connected with the computer.

Furthermore, the barrel comprises an upper part and a lower part, the upper part and the lower part are connected through a fastener, the joint of the upper part and the lower part of the barrel realizes the airtightness through the arrangement of the groove and the convex groove, the barrel is made of stainless steel alloy, and the wall thickness is 15-30 mm.

Further, the hollow cavity passes through pipeline intercommunication gas storage tank, is equipped with the booster pump on the pipeline, and the round hole coats and is stamped the square mesh net, and the hole side length of square mesh net is 0.5~0.6 mm.

The stirring method of the full-automatic rock-like sample stirring machine capable of preventing dust from being stirred uniformly comprises the following steps of:

s1, preparing materials required by the test, loading solid materials into a solid storage hopper, and loading liquid materials into a liquid storage hopper;

s2, enabling the pressure in the cylinder to reach 0.5-0.8 atmospheric pressure through a pressure boosting/relieving valve, opening a solid storage hopper, enabling the solid mixture to rapidly enter the cylinder under the action of gravity and negative pressure, opening a rotating motor, driving a stirring device, a threaded stirrer and a stirrer to rotate through a rotating shaft, and uniformly stirring the solid mixture;

s3, after the particle uniformity of the solid mixture in the cylinder meets the requirement, opening the liquid storage hopper and the liquid pressurization control device, enabling the liquid material to be changed into mist through the liquid pressurization control device, and uniformly spraying the mist into the cylinder through the annular spray head, so that the liquid material is uniformly contacted with the solid mixture;

s4, after the solid mixture and the liquid material are stirred to be in a semi-solid state, adjusting a rotating motor to drive a rotating shaft to rotate reversely, introducing pressurized airflow into a hollow cavity of the rotating shaft to quickly separate the mixture on the threaded stirrer, pushing the mixture to fall into the bottom of the barrel under the action of the threaded stirrer, and fully stirring the mixture by the stirrer until the mixture is uniform;

s5, increasing the pressure in the cylinder to 1.5 atmospheric pressures through a pressure increasing/reducing valve, and then opening a discharge hole, so that the sample can be rapidly discharged under the combined action of gravity and pressure difference;

s6, after the sample is discharged, the liquid pressurization control device is opened, and the mixer is cleaned by spraying clean water.

The invention has the beneficial effects that:

1. according to the invention, before all solid materials enter the cylinder body, the pressure in the cylinder is lower than the external pressure under the action of the air pumping device, and dust can be effectively prevented from escaping in the charging process under the action of the pressure difference; in the stage of anticlockwise rapid rotation of the rotating shaft, the mixture on the threaded stirrer is rapidly separated from the stirrer under the centrifugal action and the action of rapid airflow sprayed from the round hole, so that the residue of the mixture on the stirrer can be reduced; and in the discharging stage, the air pressure pump pumps air from inside to outside to increase the pressure in the cylinder, and the residue of the sample can be reduced by matching with the operation of the scraper. The loss of the material in the whole process is efficiently controlled in multiple links, dust is avoided, the consumption of the material in the sample preparation process is reduced, the sample performance is controlled more accurately, and the prepared rock-like sample can be used for analogically researching the fracture mechanism, the crack size effect and the fracture toughness of solid rock materials with different strengths.

2. The annular nozzle is adopted, the included angle between the atomized liquid sprayed by the liquid through the annular nozzle and the inner wall of the cylinder body of the stirring device is 30-150 degrees, so that the space for contacting the liquid and the solid powder is larger and more uniform, and excessive powder balls with dry inside and wet outside due to insufficient contact of the liquid and the powder in the ordinary stirring process are avoided; under the action of the triangular stirrer, the powder is stirred more fully, and finally, the phenomenon of powder agglomeration is prevented. Wherein the adoption of the thread stirrer on the rotating shaft has two advantages: firstly, in the process of stirring material powder, the axial thrust generated by the two-blade-shaped stirring device at the uppermost end and the threaded stirrer in the stirring process enables different types of material powder to be fully stirred; secondly, when the semisolid mixture that forms after adding liquid, under the effect that the screw thread agitator upwards promoted, can obtain more intensive stirring, improved the stirring degree of consistency. The stirring uniformity is realized and judged through the solid particle electric control sensor, and the uniform stirring of the mixture is realized.

3. The automatic stirring device can be manually adjusted in the whole stirring process, can realize full automation after the computer is set, saves manpower, reduces physical consumption and improves the sample preparation efficiency.

Drawings

In order to more clearly illustrate the embodiments of the present invention 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 obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.

FIG. 2 is a schematic structural diagram of a scraper blade during discharging in the embodiment of the invention.

FIG. 3 is a schematic structural diagram of a scraper blade during stirring in the embodiment of the present invention.

Fig. 4 is a schematic structural view of an annular showerhead in an embodiment of the present invention.

FIG. 5 is a schematic view of a liquid storage hopper according to an embodiment of the invention.

FIG. 6 is a schematic view of the construction of a screw agitator in an embodiment of the present invention.

FIG. 7 is a schematic structural diagram of a circular hole and a square hole mesh according to an embodiment of the present invention.

In the figure, 1, a solid storage hopper; 1-1, a solid feeding control device; 1-2, a hopper cover; 2. a liquid storage hopper; 2-1, a liquid feeding control device, 2-1a, a pressure sensing electric control element, 2-1b, a control channel, 2-1c and an electric control switch; 2-2, a liquid feeding bin partition plate; 2-3, a mixing bin; 3. the annular nozzle is provided with 3-1. a circular truncated cone-shaped spray hole; 4. a liquid pressurization control device; 5. air pumping device; 6. a rotating electric machine; 7. a stirring device; 8. a threaded stirrer; 9. 9-1 parts of a stirrer, 9-2 parts of a first stirring wire, 9-3 parts of a second stirring wire and a scraper; 10. a barrel; 11. a fastener; 12. an annular support; 13. a support; 14. a discharge port; 14-1, a valve; 15. a solid particle electrically controlled sensor; 16. a round hole sieve; 17. a rotating shaft; 17-1, round holes; 17-2, square hole net; 18. a computer; 19. moisture content inductor.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention embodiment relates to a full-automatic rock sample stirrer capable of preventing dust and stirring uniformly, which comprises a barrel body 10, wherein the barrel body 10 is fixedly connected with a support 13 through an annular support 12, a closed cavity is arranged inside the barrel body 10, a pressurizing/pressure releasing valve is arranged at the top of the barrel body 10, a rotating shaft 17 is arranged on a central axis of the barrel body 10, the upper end of the rotating shaft 17 is connected with an output shaft of a rotating motor 6, a stirring device 7 and a thread stirrer 8 are respectively fixed on the rotating shaft 17 from top to bottom, a hollow cavity is arranged at the center of the rotating shaft 17, a plurality of circular holes 17-1 communicated with the hollow cavity are uniformly distributed on the rotating shaft 17 between adjacent fan blades of the thread stirrer 8, and if 4 circular holes 17-1 are arranged, an included angle formed between two adjacent circular holes 17-1 and a vertical axis is 90 degrees; the flabellum incline direction of screw thread agitator 8 is opposite with agitating unit 7's incline direction, the axial thrust that screw thread agitator 8 produced is less than the axial thrust that agitating unit 7 produced, barrel 10 top is equipped with solid storage hopper 1, annular shower nozzle 3 is installed to barrel 10 inner wall between screw thread agitator 8 and the agitating unit 7, liquid pressurization controlling means 4 is installed to the barrel 10 outer wall that corresponds with annular shower nozzle 3 position, liquid pressurization controlling means 4 is linked together with annular shower nozzle 3, liquid intercommunication is realized through hose and liquid storage hopper 2 to liquid pressurization controlling means 4, liquid storage hopper 2 locates the barrel 10 outside, liquid storage hopper 2 and support 13 fixed connection.

The bottom of the cylinder body 10 is in a circular truncated cone shape, an included angle between a bus of the circular truncated cone and the bottom surface is 45 degrees, the discharge port 14 is arranged at the center of the bottom of the cylinder body 10, the stirrer 9 is installed at the bottom of the cylinder body 10, a detachable circular hole sieve 16 is horizontally arranged between the threaded stirrer 8 and the stirrer 9, the stirrer 9 is fixedly connected with a telescopic head of the electric push rod, a main body of the electric push rod is hermetically installed in the rotating shaft 17, the electric push rod is electrically connected with the computer 18, the stirrer 9 can move up and down, and a control line is arranged in a hollow cavity of the rotating shaft 17.

As shown in fig. 2-3, the stirrer 9 is composed of two triangular first stirring wires 9-1 and second stirring wires 9-2, so that the mixture is fully contacted in the stirring process, the uniformity is ensured, the solidification phenomenon is not easy to occur, and the stirring quality is improved. The first stirring wire 9-1 and the second stirring wire 9-2 are mutually vertical, scrapers 9-3 are respectively arranged at the positions, close to the inner wall of the bottom of the cylinder body 10, of the first stirring wire 9-1 and the second stirring wire 9-2, the installation positions of the scrapers 9-3 on the first stirring wire 9-1 and the second stirring wire 9-2 are different, the working areas on the inner wall of the cylinder body 10 are partially overlapped, the scrapers 9-3 can be ensured to fully work, and the residue of a sample is reduced; in the embodiment, the scraper 9-3 is welded on a first stirring wire 9-1 and a second stirring wire 9-2, the first stirring wire 9-1 is provided with 4 scrapers 9-3, and the second stirring wire 9-2 is provided with 2 scrapers 9-3. The diameter ranges of the first stirring wire 9-1 and the second stirring wire 9-2 are 10-20 mm. When the diameter of the stirring wire is too small, the surface area of the stirring wire is too small, the stirring effect is not obvious, and the fixation of the scraper 9-3 is not facilitated; when the diameter of the stirring wire is too large, the surface area of the stirring wire is too large, and the mixture remaining on the stirring wire is too much and unfavorable for the exchange and mixing of substances between the mixtures.

In the stirring stage, the rotating shaft 17 drives the stirring device 7, the threaded stirrer 8 and the stirrer 9 to rotate, and the distance between the scraper 9-3 and the inner wall of the bottom of the cylinder 10 is 5mm, so that the stirring is prevented from being influenced; in the discharging stage, the telescopic head of the electric push rod extends downwards to drive the stirrer 9 to move downwards, and the scraper 9-3 is in close contact with the inner wall of the bottom of the barrel 10 due to the fact that the inclination angles of the scraper 9-3 and the inner wall of the bottom of the barrel 10 are the same, so that the purpose of scraping out a sample is achieved, and the telescopic rod returns to the contracted state after discharging is completed.

The control system comprises a computer 18, and the solid particle electric control sensor 15 and the water content sensor 19 are respectively in signal connection with the computer 18; after the computer 18 is provided with the parameters of the related similar materials of the required mixture ratio, the intelligent control of each controller is realized, and the sample preparation is carried out after the materials are automatically added, mixed and stirred uniformly; the device provided by the embodiment of the invention combines a plurality of sample preparation processes together, the feeding process, the stirring process, the discharging process and the cleaning process can be controlled by the computer 18, the sample stirring integration is realized, the complicated processes of weighing, feeding and mechanical stirring in the manual operation of sample preparation in the prior art are overcome, and the efficiency and the quality are improved.

A liquid pressurization control means 4 for controlling the flow rate of the liquid and atomizing the liquid by pressurization; as shown in fig. 4, the height of the annular nozzle 3 is 5cm, the thickness is 2cm, small holes with the same size are uniformly distributed on one side of the annular nozzle 3 close to the inner wall of the cylinder 10, the liquid pressurization control device 4 is communicated with the annular nozzle 3 through the holes to ensure that liquid enters the cylinder 10, and a circular truncated cone-shaped nozzle hole 3-1 is arranged on one side of the annular nozzle 3 far from the inner wall of the cylinder 10, so that the prepared semisolid mixture is stirred, the nozzle hole of the annular nozzle 3 is circular truncated cone-shaped, and the semisolid mixture is prevented from being adhered to the annular nozzle 3; the included angle between the generatrix of the circular truncated cone-shaped spray hole 3-1 and the inner wall of the cylinder body 10 is 30 degrees, so that the included angle between the flow direction of the atomized liquid sprayed by the annular spray head 3 and the inner wall of the cylinder body 10 can be controlled to be 30-150 degrees, the space for contacting the liquid and the solid powder is larger and more uniform, and excessive dry and wet powder lumps formed by insufficient contact of the liquid and the powder in the ordinary stirring process are avoided; in addition, the annular nozzle 3 is positioned between the stirring device 7 and the threaded stirrer 8 at the relative position in the vertical direction, so that the sprayed liquid and powder are mixed, the powder is not easy to adhere to fan blades of the stirring device 7, and the mixture can be fully stirred by the threaded stirrer 8 to obtain a better effect. The liquid pressurization control device 4 is Hy4700, and has the advantages of sufficient pressure, low power consumption and low noise.

As shown in fig. 5, the liquid storage hopper 2 is sequentially provided with a storage cavity, a control cavity and a mixing bin 2-3 from top to bottom, a vertically arranged liquid feeding bin partition plate 2-2 divides the storage cavity into 4 liquid storage bins, a control channel 2-1b is arranged in the control cavity, each liquid storage bin is respectively communicated with the mixing bin 2-3 through the corresponding control channel 2-1b, an electric control switch 2-1c is arranged in each control channel 2-1b, an induction probe of a pressure induction electric control element 2-1a extends into the corresponding liquid storage bin, a main body of the pressure induction electric control element 2-1a is arranged in the control cavity, the pressure induction electric control element 2-1a is electrically connected with a computer 18, the computer 18 is connected with the electric control switch 2-1c, and the computer 18 is used for controlling the corresponding electric control switch 2-1c according to feedback information of the pressure electric control element 2-1a Opening and closing; the mixing bin 2-3 is communicated with a liquid pressurization control device 4 through a hose. The pressure sensing electric control element 2-1a, the control channel 2-1b and the electric control switch 2-1c form a liquid feeding control device 2-1 together.

The pressure sensing electric control elements 2-1a sense the pressure in each liquid storage bin in real time and convert the pressure into the volume of the corresponding liquid material, the model of the pressure sensing electric control elements 2-1a is ZNMM-1, the stability is strong, the measurement accuracy is high, the precision is high, the waterproof effect is good, and a proper range is provided. Before various liquids are added into the liquid storage hopper 2, the computer 18 sets volume parameters for the pressure sensing electric control element 2-1a in advance, when the volume displayed by the pressure sensing electric control element 2-1a in real time is smaller than the preset volume, the computer 18 controls the electric control switch 2-1c in the corresponding control channel 2-1b to be closed, and the liquid materials in the liquid storage bin cannot flow into the mixing bin 2-3 through the control channel 2-1 b; when the volume displayed by the pressure sensing electric control element 2-1a in real time is larger than the preset volume, the computer 18 controls the electric control switch 2-1c in the corresponding control channel 2-1b to be opened, and the liquid material in the liquid storage bin flows into the mixing bin 2-3 through the control channel 2-1b, so that the control of adding volume during mixing of the liquid material is realized.

As shown in fig. 6-7, the radius of each circle of the blades of the threaded stirrer 8 is 20cm, and the vertical distance between adjacent blades is 10cm, so that excessive samples are prevented from being left on the blades due to too small blade distance, the mixture is further utilized to separate from the blades, and unnecessary waste is reduced. The toper closed angle that all is equipped with in the middle of every layer of flabellum of screw agitator 8 is protruding, and toper closed angle is protruding when the rotation along with the flabellum, can play and slow down or hinder the trend of mixture towards the rotation axis accumulation, plays the effect of accelerating the stirring simultaneously to a certain extent. The diameter of the convex part of the conical sharp angle is 2cm, the height of the convex part of the conical sharp angle is 1cm, the large-scale residue of the mixture on the fan blade is caused by the overlarge convex part, and the effect of accelerating the stirring is difficult to achieve due to the too small convex part. The range of the inclination angle of the fan blades of the threaded stirrer 8 is 30-45 degrees. When the inclination angle of the fan blades is too small, a large amount of the mixture remains on the fan blades, and when the inclination angle of the fan blades is too large, the mixture is too short to be in contact with the mixture under the action of gravity, so that the aim of fully stirring cannot be fulfilled.

The outer diameter of the rotating shaft 17 is 4cm, the inner diameter of the rotating shaft is 1cm, the hollow cavity is communicated with a gas storage tank through a pipeline, a booster pump is arranged on the pipeline, the diameter of the round hole 17-1 is 0.5cm, a square hole net 17-2 covers the round hole 17-1, the side length of a hole of the square hole net 17-2 is 0.5-0.6 mm, and mixture is prevented from blocking the round hole 17-1; in the stirring process, gas with certain pressure can be sprayed out from the round hole 17-1 to clean the mixture remained on the threaded stirrer 8 and the rotating shaft 17 according to actual requirements, and the gas can be sprayed out from the round hole 17-1 to clean the residual materials in the threaded stirrer 8 and the cylinder 10 after the stirring is finished.

The blades of the stirring device 7 are horizontally or vertically arranged long-strip-shaped blades, the number of the blades is 2-4, and the blades are symmetrically arranged on the rotating shaft 17; the number of the fan blades is adjusted, so that the force generating range is larger when the stirring device 7 rotates, a better using effect is obtained, the fan blades of the stirring device 7 are vertically arranged long-strip-shaped fan blades, and solid powder is prevented from being left on the fan blades; the rotating shaft 17 is driven by the rotating motor 6, so that the powdery solid can be quickly stirred; when rotation axis 17 clockwise turning, opposite thrust about screw thread agitator 8 and agitating unit 7 produce, when solid material moves down from solid storage hopper 1, at first mix under agitating unit 7 centrifugal force, because the flabellum incline direction of screw thread agitator 8 is opposite with agitating unit 7's incline direction, and the axial thrust that screw thread agitator 8 produced is less than the axial thrust that agitating unit 7 produced, screw thread agitator 8 and agitating unit 7 cooperation, upwards promote semi-solid state mixture, can prevent solid mixed material from falling fast, improve the stirring effect, the stirring is more even. When the uniformity of solid mixed material reaches the requirement, spout into liquid material through annular nozzle 3, at solid mixed material and liquid material stirring stage, the ascending thrust of screw thread agitator 8 can prevent solid-liquid mixture from falling fast, can not rise to agitating unit 7 simultaneously on, can make full use of screw thread agitator 8 effectively stir solid-liquid mixture, promote stirring effect. In the sample discharging stage, the rotating shaft 17 rotates anticlockwise quickly, and samples remained on the threaded stirrer 8 are quickly separated under the centrifugal action, so that the loss of materials is reduced.

The rotating frequency range of the rotating motor 6 is 0-100 r/min, the precision is 0.1r/min, and parameters such as the rotating speed, the rotating direction and the time can be controlled through a control panel of the rotating motor 6 or a computer 18 connected with the control panel according to different materials.

The cylinder 10 is composed of an upper part and a lower part, the upper part and the lower part are connected through a fastener 11, the upper part and the lower part of the cylinder 10 are sealed through the arrangement of a groove and a convex groove, the cylinder 10 is made of stainless steel alloy, the wall thickness is 15-30 mm, the pressure difference inside and outside the cylinder 10 can be completely borne, and the problem of poor safety is avoided.

An air pressure measuring instrument is arranged in the cylinder body 10, the change of the air pressure in the cylinder body 10 in the process of air pressure pumping is monitored in real time, and the air pressure pumping speed can be manually controlled; the pressure boosting/relieving valve is connected with the air pressure pumping device 5, a controller is installed in the air pressure pumping device 5, the air pressure measuring instrument and the controller are both electrically connected with the computer 18, and the computer 18 is used for controlling the pressure pumping speed according to the feedback information of the air pressure measuring instrument; the computer 18 is used for setting parameters to control the pumping speed, the adjusting controller can realize two states of air pumping and air filling, and the power of the air pumping device 5 is adjusted to realize the control of the pumping speed. The air pumping device 5 adopts a mini dual-purpose air pumping pump TC-88W (Musson Tang), the weight is 3.7kg, the material is cast steel, and the power is 0.11W.

A solid particle electric control sensor 15 is arranged in the cylinder 10 close to the stirring device 7 and used for detecting the uniformity of solid particles, and a water content sensor 19 is arranged near the discharge port 14 so as to conveniently monitor the state of the mixture at any time; the output ends of the solid particle electric control inductor 15 and the water content inductor 19 are electrically connected with the computer 18; the bottom of the solid storage hopper 1 is provided with a feeding hole, a hopper cover 1-2 is installed at the feeding hole, a weighing sensor is arranged in the solid feeding control device 1-1, the model of the weighing sensor is ZNMM-1, the weight of raw materials in the solid storage hopper 1 is displayed in real time, the output end of the sensor is connected with a computer 18, the computer 18 is connected with a driving device of the hopper cover 1-2, and the computer is used for controlling the opening and closing of the hopper cover 1-2 according to information fed back by the weighing sensor; the parameters for adding the solid materials are set through the computer 18, the opening of the hopper cover 1-2 is controlled through the computer 18, and after the solid materials with required mass are added into the barrel 10, the closing of the hopper cover 1-2 is controlled through the computer 18. The discharge port 14 is provided with a valve 14-1, the valve 14-1 is electrically connected with a computer 18, the rotating motor 6 is connected with the computer 18, and the operation of the device is controlled by the computer 18.

The stirring method of the full-automatic rock-like sample stirrer capable of preventing dust and stirring uniformly provided by the embodiment of the invention comprises the following steps of:

s1, checking whether all parts of the test device are intact and usable, fixedly assembling all parts, preparing materials required by the test, filling solid materials into a solid storage hopper 1, and filling liquid materials into a liquid storage hopper 2;

and S2, switching on the power supply, starting the computer 18, and setting the ratio of the experimental materials and the parameters of the related devices, such as the volume parameter set by the pressure sensing electric control element 2-1a and the air pressure parameter of the air pumping device 5. The air pressure extractor 5 is controlled to be opened through the computer 18, the pressure in the cylinder 10 reaches 0.5-0.8 atmospheric pressure through the pressure boosting/relieving valve, and negative pressure is generated in the cylinder 10; when the hopper cover 1-2 of the solid storage hopper 1 is opened, the solid mixture quickly enters the cylinder 10 under the action of gravity and negative pressure, so that powder is prevented from escaping, and the cylinder 10 is not damaged; turning on the rotating motor 6, driving the stirring device 7, the thread stirrer 8 and the stirrer 9 to rotate through the rotating shaft 17, and uniformly stirring the solid mixture; meanwhile, the computer 18 controls the corresponding electric control switch 2-1c to be turned on, and the liquid materials in the liquid storage hopper 2 enter the mixing bin 2-3 to be mixed according to a set proportion;

the existing closed stirring cavity without negative pressure is slow in feeding in the feeding process, and the phenomenon of dust dissipation can be inevitably generated in feeding, thereby causing errors. According to the embodiment of the invention, the cylinder body 10 is set to be negative pressure, the feeding is fast, the dust escape in the feeding process is effectively prevented, and the liquid sprayed into the cylinder body 10 can be more quickly distributed in the cylinder body in a mist shape, so that the mixing of the liquid and the solid dust is more efficient and uniform, and the sample preparation effect is greatly improved.

S3, a plurality of solid mixtures are filled in the solid storage hopper 1, the particle size distribution of the mixed mixtures is uniform, the output electric signals can show a certain rule, the disordered distribution phenomenon can not occur, the electric control sensor 15 for solid particles adopts a ZH03 series laser dust sensor (TELESKY) for sensing the particle uniformity of the mixed materials in the cylinder 10, the electric signals are transmitted to the computer 18, when the uniformity meets the requirement, the computer 18 controls the liquid pressurization control device 4 to be opened, the liquid materials are changed into mist through the liquid pressurization control device 4 and are uniformly sprayed in the cylinder 10 through the annular nozzle 3, so that the liquid materials are uniformly contacted with the solid powder; the type of the solid particle electric control sensor 15 is TELESKY, the size is small, the integration is convenient, the real-time response is realized, the data is accurate, and the diameter of a small resolution particle is 0.3 mu m. By utilizing the characteristic of real-time response, when the signal output by the sensor tends to be stable, the uniformity can be judged to meet the requirement.

S4, after the solid mixture and the liquid material are stirred for a period of time, adjusting the rotating motor 6 to drive the rotating shaft 17 to rotate reversely, introducing pressurized airflow into the hollow cavity of the rotating shaft 17 to quickly separate the mixture on the threaded stirrer 8, pushing the mixture to fall into the bottom of the barrel 10 under the action of the threaded stirrer 8, and fully stirring the mixture until the mixture is uniform through the stirrer 9; scraping out the sample on the wall edge by a scraper, and when the water content of the mixture is displayed by the water content sensor 19 to be unchanged, considering that the solid-liquid mixing and stirring are uniform; the stirring time of the solid mixture and the liquid material can be determined according to the solidification time of the similar mixture prepared in advance, the time can be considered to be reached when the mixture is in a semi-solid state, and only the display result of the water content sensor 19 is referred to.

If the set stirring time is up but the uniformity displayed by the water content sensor 19 does not reach the requirement, delaying the set time value, repeating the previous step, continuing stirring, and in the stirring process, if the measured uniformity meets the set requirement, immediately ending stirring, and entering the next step; if the stirring time is up or the uniformity is not displayed, the stirring is automatically stopped, the solid mixed material is directly led out from the discharge hole 14, the uniformity of the solid mixed material is manually measured, and if the uniformity meets the requirement, the water content sensor 19 needs to be overhauled; if the uniformity displayed by the water content sensor 19 reaches the requirement and the set time does not reach, the operation is stopped immediately.

The moisture content sensor 19 adopts an induction type moisture content measuring instrument Ligno-Scanner D, adopts an electromagnetic wave induction principle, has a measuring range of 5-60% and a resolution of 0.1%, and is only influenced by substances below a surface when transmitting and receiving very weak electromagnetic signals through a sensor on the back of the instrument. The sensory reading is the average moisture value over the entire area before the surface of the object being measured reaches the deepest measurement depth. The average water content of all materials covered in the induction area in the stirring process can be well realized, so that the uniformity of the mixed materials in the stirring process is determined.

S5, increasing the pressure in the cylinder 10 to 1.5 atmospheric pressures through a pressure increasing/reducing valve, and then opening the discharge hole 14, so that the sample can be rapidly discharged under the combined action of gravity and pressure difference; the computer 18 controls the telescopic head of the electric push rod to extend downwards to drive the stirrer 9 to move downwards, so that the scraper 9-3 is in close contact with the inner wall of the bottom of the barrel 10 to achieve the purpose of scraping a sample, and the telescopic rod returns to a contracted state after discharging is finished.

S6, after the sample is discharged, the liquid pressurization control device 4 is turned on, the mixer is cleaned by spraying clean water, and the power supply and various control switches of the computer 18 are turned off.

And (4) readjusting the type of the rock-like similar materials according to the test requirements, and repeating the steps S2 to S5 to prepare rock-like samples which can be used for analogizing and researching the fracture mechanism, the crack size effect and the fracture toughness of solid rock materials with different strengths.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. The full-automatic rock sample stirrer capable of preventing dust and stirring uniformly is characterized by comprising a support (13) for supporting and fixing a barrel (10), wherein a closed cavity is arranged inside the barrel (10), a pressurizing/pressure releasing valve is arranged at the top of the barrel (10), a rotating shaft (17) is installed on a central axis of the barrel (10), the upper end of the rotating shaft (17) is connected with an output shaft of a rotating motor (6), a stirring device (7) and a threaded stirrer (8) are respectively fixed on the rotating shaft (17) from top to bottom, a hollow cavity is arranged at the center of the rotating shaft (17), a plurality of round holes (17-1) communicated with the hollow cavity are uniformly distributed on the rotating shaft (17) between adjacent fan blades of the threaded stirrer (8), the inclination direction of the fan blades of the threaded stirrer (8) is opposite to the inclination direction of the stirring device (7), and the axial thrust generated by the threaded stirrer (8) is smaller than that generated by the stirring device (7), the top of the cylinder body (10) is provided with a solid storage hopper (1), the inner wall of the cylinder body (10) between the thread stirrer (8) and the stirring device (7) is provided with an annular nozzle (3), the outer wall of the cylinder body (10) corresponding to the position of the annular nozzle (3) is provided with a liquid pressurization control device (4), the liquid pressurization control device (4) is communicated with the annular nozzle (3), the liquid pressurization control device (4) is communicated with the liquid storage hopper (2) through a hose, and the discharge hole (14) is arranged at the center of the bottom of the cylinder body (10); a solid particle electric control sensor (15) is arranged in the position, close to the stirring device (7), in the cylinder body (10), a water content sensor (19) is arranged near the discharge port (14), the solid particle electric control sensor (15) and the water content sensor (19) are respectively in signal connection with a computer (18), the computer (18) is electrically connected with a rotating motor (6), and the computer (18) is electrically connected with a solid storage hopper (1), the discharge port (14) and a driving device of a pressurization/decompression valve;

the bottom of the cylinder body (10) is in a circular truncated cone shape, an included angle between a bus of the circular truncated cone and the bottom surface is 45-60 degrees, the stirrer (9) is installed at the bottom of the cylinder body (10), the stirrer (9) is fixedly connected with a telescopic head of the electric push rod, a main body of the electric push rod is hermetically installed in the rotating shaft (17), and the electric push rod is electrically connected with the computer (18); a detachable round hole sieve (16) is horizontally arranged between the threaded stirrer (8) and the stirrer (9); the stirrer (9) consists of two triangular first stirring wires (9-1) and second stirring wires (9-2), the first stirring wires (9-1) and the second stirring wires (9-2) are perpendicular to each other, scrapers (9-3) are mounted at positions, close to the inner wall of the bottom of the barrel body (10), of the first stirring wires (9-1) and the second stirring wires (9-2), the inclination angles of the scrapers (9-3) and the inner wall of the bottom of the barrel body (10) are the same, the mounting positions of the scrapers (9-3) on the first stirring wires (9-1) and the second stirring wires (9-2) are different, and working areas on the inner wall of the barrel body (10) are partially overlapped;

holes with the same size are uniformly distributed on one side, close to the inner wall of the barrel body (10), of the annular nozzle (3), the liquid pressurization control device (4) is communicated with the holes of the annular nozzle (3), a truncated cone-shaped spray hole (3-1) is formed in one side, far away from the inner wall of the barrel body (10), of the annular nozzle (3), and the included angle between the generatrix of the truncated cone-shaped spray hole (3-1) and the inner wall of the barrel body (10) is 30 degrees;

the pressure boost/relief valve reduces the pressure in the section of thick bamboo to 0.5~0.8 atmospheric pressure when being used for the feeding, increases the pressure in the section of thick bamboo to 1.5 atmospheric pressure during the ejection of compact.

2. The full-automatic rock-like sample stirring machine capable of preventing dust and stirring uniformly according to claim 1, characterized in that the blades of the stirring device (7) are horizontally or vertically arranged long-strip-shaped blades, the number of the blades is 2-4, and the blades are symmetrically arranged on the rotating shaft (17); the range of the inclination angle of the fan blades of the threaded stirrer (8) is 30-45 degrees, and a conical sharp-angle bulge is arranged in the middle of each layer of fan blades of the threaded stirrer (8).

3. The full-automatic rock sample stirrer capable of preventing dust and stirring uniformly according to claim 1, wherein the liquid storage hopper (2) is sequentially provided with a storage cavity, a control cavity and a mixing bin (2-3) from top to bottom, the storage cavity is divided into a plurality of liquid storage bins by a vertically arranged liquid feeding bin partition plate (2-2), a control channel (2-1b) is arranged in the control cavity, each liquid storage bin is communicated with the mixing bin (2-3) through the corresponding control channel (2-1b), an electric control switch (2-1c) is arranged in each control channel (2-1b), a sensing probe of a pressure sensing electric control element (2-1a) extends into the corresponding liquid storage bin, and a main body of the pressure sensing electric control element (2-1a) is arranged in the control cavity, the pressure sensing electric control element (2-1a) is electrically connected with a computer (18), the computer (18) is electrically connected with the electric control switch (2-1c), and the computer (18) is used for controlling the opening and closing of the corresponding electric control switch (2-1c) according to the feedback information of the pressure sensing electric control element (2-1 a); the mixing bin (2-3) is communicated with a liquid pressurization control device (4) through a hose.

4. The fully automatic dust-proof uniformly-stirred rock sample stirrer according to claim 1, wherein an air pressure measuring instrument is installed in the cylinder (10), the pressure boosting/relieving valve is connected with the air pressure pumping device (5), a controller is installed in the air pressure pumping device (5), the air pressure measuring instrument and the controller are both electrically connected with the computer (18), and the computer (18) is used for controlling the pressure pumping speed according to feedback information of the air pressure measuring instrument.

5. The full-automatic rock-like sample stirring machine capable of preventing dust and stirring uniformly according to claim 1, wherein a feeding hole is formed in the bottom of the solid storage hopper (1), a hopper cover (1-2) is installed at the feeding hole, a weighing sensor is arranged in the solid feeding control device (1-1), the output end of the weighing sensor is connected with a computer (18), the computer (18) is connected with a driving device of the hopper cover (1-2), and the computer (18) is used for controlling the opening and closing of the hopper cover (1-2) according to information fed back by the weighing sensor; the liquid pressurization control device (4) is electrically connected with a computer (18); the discharge port (14) is provided with a valve (14-1), and the valve (14-1) is electrically connected with the computer (18).

6. The full-automatic rock-like sample stirring machine capable of preventing dust and stirring uniformly according to claim 1, wherein the cylinder (10) is composed of an upper part and a lower part, the upper part and the lower part are connected through a fastener (11), the joint part of the upper part and the lower part of the cylinder (10) realizes airtightness through the arrangement of a groove and a convex groove, the cylinder (10) is made of stainless steel alloy, and the wall thickness is 15-30 mm.

7. The full-automatic rock-like sample stirring machine capable of preventing dust and stirring uniformly as claimed in claim 1, wherein the hollow cavity is communicated with a gas storage tank through a pipeline, a booster pump is arranged on the pipeline, a square mesh (17-2) is covered on the round hole (17-1), and the length of the hole edge of the square mesh (17-2) is 0.5-0.6 mm.

8. The stirring method of the full-automatic rock-like sample stirring machine for preventing dust and stirring evenly is characterized in that the full-automatic rock-like sample stirring machine for preventing dust and stirring evenly, which is disclosed by any one of claims 1 to 7, is adopted, and the stirring method is specifically carried out according to the following steps:

s1, preparing materials required by the test, loading solid materials into a solid storage hopper (1), and loading liquid materials into a liquid storage hopper (2);

s2, enabling the pressure in the barrel (10) to reach 0.5-0.8 atmospheric pressure through a pressure boosting/relieving valve, opening the solid storage hopper (1), enabling the solid mixture to rapidly enter the barrel (10) under the action of gravity and negative pressure, opening the rotating motor (6), driving the stirring device (7), the threaded stirrer (8) and the stirrer (9) to rotate through the rotating shaft (17), and uniformly stirring the solid mixture;

s3, after the particle uniformity of the solid mixture in the cylinder (10) meets the requirement, opening the liquid storage hopper (2) and the liquid pressurization control device (4), enabling the liquid material to be changed into mist through the liquid pressurization control device (4), and uniformly spraying the liquid material in the cylinder (10) through the annular spray head (3), so that the liquid material is uniformly contacted with the solid mixture;

s4, after the solid mixture and the liquid material are stirred to be semi-solid, adjusting a rotating motor (6) to drive a rotating shaft (17) to rotate reversely, introducing pressurized airflow into a hollow cavity of the rotating shaft (17) to enable the mixture on a threaded stirrer (8) to be separated quickly, pushing the mixture to fall into the bottom of a barrel body (10) under the action of the threaded stirrer (8), and fully stirring the mixture until the mixture is uniform through a stirrer (9);

s5, increasing the pressure in the cylinder (10) to 1.5 atmospheric pressures through a pressure increasing/reducing valve, and then opening a discharge hole (14), so that the sample can be rapidly discharged under the combined action of gravity and pressure difference;

s6, after the sample is discharged, the liquid pressurization control device (4) is opened, and the mixer is cleaned by spraying clean water.