CN221612444U

CN221612444U - Self-cleaning mechanical sampling head

Info

Publication number: CN221612444U
Application number: CN202322941682.3U
Authority: CN
Inventors: 薛小明; 杨翮; 李睿宇; 范林林; 程大央; 李岩浩; 袁亚楠
Original assignee: China Resources Power Jiaozuo Co Ltd
Current assignee: China Resources Power Jiaozuo Co Ltd
Priority date: 2023-10-31
Filing date: 2023-10-31
Publication date: 2024-08-27
Anticipated expiration: 2033-10-31

Abstract

The utility model discloses a self-cleaning mechanical sampling head, which relates to the technical field of thermal power generation and comprises a sampling cylinder (3) fixed on a connecting frame, a sampling screw (4) inserted into the sampling cylinder (3), a driving device for driving the sampling screw (4) to rotate and fixedly installed on the connecting frame, a lifting device for driving the connecting frame to lift, a crushing head connected to the lower end of the sampling screw (4), and a cleaning tool bit fixedly installed on the edge of a spiral blade of the sampling screw (4), wherein the clearance between the cleaning tool bit and the sampling cylinder (3) is smaller than the clearance between the spiral blade and the sampling cylinder (3). The self-cleaning mechanical sampling head effectively solves the problems of coal blockage, wall hanging and the like between the sampling screw (4) blades and the cylinder wall when the sampling head screw blades adopt coal slime or coal with larger water content.

Description

Self-cleaning mechanical sampling head

Technical Field

The utility model relates to the technical field of thermal power generation, belongs to a fuel sampling process, and particularly relates to a self-cleaning mechanical sampling head.

Background

Coal-fired power plants mostly adopt coal blending combustion to reduce the power generation cost, and most of blended combustion coal types are coal slime with larger water content or inferior coal types with more gangue and stones. The mechanical sampling head in the current market cannot adapt to mechanical sampling of various kinds of coal blending. In the mechanical sampling process, the phenomenon of locking and blocking of sampling spiral blades frequently occurs due to coal granularity, water content, impurities and the like, so that the normal operation of a sampling machine is seriously influenced and the sampling accuracy is influenced.

Leading to the blockage of the existing sampling helical blade: 1) When the sampling helical blade is used for taking coal slime or inferior coal, the sampling helical blade is blocked and blocked due to factors such as granularity, moisture, sundries and the like; 2) Because the gap between the sampling spiral blade and the sampling barrel wall is 5mm, coal slime or coal with larger total moisture content forms a 5mm middle-through wall coal bed which is vertically communicated between the sampling spiral blade and the barrel wall, so that the sampling spiral blade and the middle-through wall coal bed form surface contact, and the sampling spiral is blocked or the overload trip of the sampling spiral motor is caused. The current solution to the above problems is: 1. the coal bed on the wall of the sampling tube is free to fall off by manually knocking the outer wall of the sampling tube, but the coal bed cannot be cleaned comprehensively and thoroughly. (because the length of the sampling tube reaches 6268mm, the manual cleaning workload is large and a large potential safety hazard exists). 2. Under the condition that the sampling spiral is not blocked, the wall-mounted coal seam on the sampling cylinder wall is cleaned in a vibration mode through inversion of the sampling spiral, but the wall-mounted coal seam compacted on all cylinder walls cannot be cleaned by the method, and the cleaning effect is poor.

In summary, how to effectively solve the problems of coal blockage, wall hanging and the like between the sampling spiral blade and the cylinder wall when the sampling head spiral blade is used for taking coal slime or coal with larger water content is an urgent need to be solved by the current technicians in the field.

Disclosure of utility model

The utility model aims to provide a self-cleaning mechanical sampling head which effectively solves the problems of coal blockage, wall hanging and the like between a spiral blade and a cylinder wall when coal slime or coal with larger water content is adopted by the spiral blade of the sampling head.

In order to solve the technical problems, the utility model provides the following technical scheme:

The utility model provides a self-cleaning machinery sampling head, includes the sampling section of thick bamboo that is fixed in on the link, inserts sampling spiral in the sampling section of thick bamboo, drive sampling spiral rotation and fixed mounting are in drive arrangement on the link, drive elevating gear that the link goes up and down, connect in crushing head, the fixed mounting of sampling spiral lower extreme in the cleaning tool bit on the helical blade border of sampling spiral, cleaning tool bit with the clearance of sampling section of thick bamboo is less than helical blade with the clearance of sampling section of thick bamboo.

Optionally, the cleaning tool bit is a U-shaped cleaning tool bit, and the middle opening of the U-shaped cleaning tool bit is clamped on the edge of the spiral blade.

Optionally, both ends of the U-shaped cleaning tool bit are provided with chamfers.

Optionally, the cleaning tool bit is delta type cleaning tool bit, delta type cleaning tool bit include triangle tool bit and with triangle tool bit fixed connection's mounting panel, the upper surface of mounting panel with helical blade's lower surface laminating is fixed.

Optionally, the cleaning tool bit and the helical blade are fixed by welding, riveting or bolting.

Optionally, one of the cleaning heads is fixed to the helical blade at each 180 ° or 90 ° interval.

Optionally, the material of the cleaning tool bit is wear-resistant alloy.

Optionally, a gap between the tail end of the sweeping cutter head and the sampling cylinder is 2mm-5mm.

Optionally, an alloy wear-resistant tool rest is additionally arranged at the bottom of the sampling screw, and the crushing head is fixed at the edge of a blade of the alloy wear-resistant tool rest.

Optionally, the connecting frame is slidably connected with the vertical rail.

The self-cleaning mechanical sampling head has the beneficial effects that the self-cleaning mechanical sampling head comprises a sampling cylinder, a sampling screw 4, a driving device, a lifting device, a crushing head and a cleaning tool bit. The sampling tube and the driving device are fixed on the connecting frame, the lifting device is connected with the connecting frame, and the lifting device drives the connecting frame to lift up and down.

The driving device drives the sampling screw to rotate, the driving device can be specifically a motor and a speed reducer, an output shaft of the motor is connected with the speed reducer, and the speed reducer is connected with a screw shaft of the sampling screw. The sampling screw is inserted into the sampling cylinder, and a gap is reserved between the screw blade of the sampling screw and the inner wall of the sampling cylinder. The self-cleaning mechanical sampling head drives the sampling screw to do rotary motion in the sampling cylinder through the motor and the speed reducer, the lifting hydraulic cylinder lifts the descending motor, the speed reducer, the sampling cylinder, the sampling screw and other mechanisms to do up-down reciprocating motion, the sampling cylinder and the sampling screw are driven to penetrate into a coal pile in an automobile or a fire carriage together in the descending process of the sampling cylinder and the sampling screw, the coal flow is lifted to a buffering bin at the top of the sampling screw through uninterrupted rotation of the sampling screw, the motor, the speed reducer, the sampling cylinder, the sampling screw and other mechanisms are lifted to an original position under the action of the lifting hydraulic cylinder, a coal sample buffering bin gate is opened, and a coal sample is conveyed to a next-stage mechanism.

The crushing head is connected to the lower end of the screw shaft of the sampling screw, the crushing head is transversely arranged, and a space is reserved between the crushing head and the inner wall of the sampling cylinder. The sampling process of the self-cleaning mechanical sampling head is that the sampling process of the self-cleaning mechanical sampling head has larger and harder stone or gangue in the inferior fuel, and the crushing head crushes the stone or gangue to avoid the stone or gangue from blocking the helical blade.

The cleaning tool bit is fixedly arranged on the edge of the spiral blade of the sampling spiral, the clearance between the cleaning tool bit and the sampling cylinder 3 is smaller than the clearance between the spiral blade and the sampling cylinder, the cleaning alloy tool bit has certain dead weight after cutting the wall-mounted coal seam, and the cut wall-mounted coal seam can fall off freely.

The self-cleaning mechanical sampling head provided by the utility model is mainly used for sampling and acceptance of inferior fuels such as coal slime, blending coal and the like of thermal power generation enterprises, and the device is suitable for sampling the inferior fuels and does not influence the sampling and acceptance capacities of other conventional fuels. Through the sampling screw that adopts the increase to clean the tool bit, adapted all kinds of inferior fuel's sampling operating mode, under the operating mode that inferior fuel is the water content great or coal slime powdery thing, clean the tool bit and carry out broken wall clearance to the wall built-up coal seam on the sampling section of thick bamboo wall, solve sampling head screw blade and take coal slime or the great coal kind of water content between sampling screw blade and the section of thick bamboo wall the stifled coal wall phenomenon. The crushing head is additionally arranged at the bottom of the sampling screw and is used for crushing larger stones and gangue blocks in inferior fuel, and the blocking phenomenon of screw blades and the wall of the sampling cylinder caused by the stones and the gangue blocks is eliminated.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic structural diagram of a U-shaped cleaning blade according to an embodiment of the present utility model;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a schematic view of a delta-type sweeping tool bit according to one embodiment of the present utility model;

FIG. 4 is a top view of FIG. 3;

FIG. 5 is a side view of FIG. 3;

FIG. 6 is a schematic structural diagram of a self-cleaning mechanical sampling head according to an embodiment of the present utility model;

fig. 7 is a partial enlarged view at a in fig. 6.

The figures are marked as follows:

a U-shaped cleaning tool bit 1, a delta-shaped cleaning tool bit 2, a sampling cylinder 3 and a sampling spiral 4.

Detailed Description

The utility model aims at providing a self-cleaning mechanical sampling head which effectively solves the problems of coal blockage, wall hanging and the like between a spiral blade and a cylinder wall when coal slime or coal with larger water content is adopted by the spiral blade of the sampling head.

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. 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.

Referring to fig. 1 to 7, fig. 1 is a schematic structural diagram of a U-shaped cleaning blade according to an embodiment of the present utility model; FIG. 2 is a top view of FIG. 1; FIG. 3 is a schematic view of a delta-type sweeping tool bit according to one embodiment of the present utility model; FIG. 4 is a top view of FIG. 3; FIG. 5 is a side view of FIG. 3; FIG. 6 is a schematic structural diagram of a self-cleaning mechanical sampling head according to an embodiment of the present utility model; fig. 7 is a partial enlarged view at a in fig. 6.

In a specific embodiment, the self-cleaning mechanical sampling head provided by the utility model comprises a sampling cylinder 3 fixed on a connecting frame, a sampling screw 4 inserted into the sampling cylinder 3, a driving device for driving the sampling screw 4 to rotate and fixedly installed on the connecting frame, a lifting device for driving the connecting frame to lift, a crushing head connected to the lower end of the sampling screw 4, and a cleaning tool bit fixedly installed on the edge of a spiral blade of the sampling screw 4, wherein the clearance between the cleaning tool bit and the sampling cylinder 3 is smaller than the clearance between the spiral blade and the sampling cylinder 3.

In the structure, the self-cleaning mechanical sampling head comprises a sampling cylinder 3, a sampling screw 4, a driving device, a lifting device, a crushing head and a cleaning tool bit. The sampling tube 3 and the driving device are fixed on the connecting frame, the lifting device is connected with the connecting frame, the lifting device drives the connecting frame to lift up and down, and the specific lifting device can be a lifting hydraulic cylinder.

The driving device drives the sampling screw 4 to rotate, the driving device can be specifically a motor and a speed reducer, an output shaft of the motor is connected with the speed reducer, and the speed reducer is connected with a screw shaft of the sampling screw 4. The sampling screw 4 is inserted into the sampling cylinder 3, and a gap is formed between the screw blade of the sampling screw 4 and the inner wall of the sampling cylinder 3. The gap is moderate, if the gap between the sampling screw 4 and the sampling cylinder 3 is too large, part of the coal sample falls along the gap when the sampling machine takes the coal sample, so that the taken coal sample is not representative; if the gap is too small, the surface contact of the sampling spiral 4 and the wall-hanging coal bed in the sampling cylinder 3 is in an extrusion state, so that the wall-hanging coal bed is repeatedly extruded and compacted in the wall of the sampling cylinder 3, and the wall breaking and cleaning of the alloy cutter head are finally influenced. Alternatively, the diameter of the helical blade of the sampling helix 4 is 294mm, the diameter of the inner wall of the sampling tube is 310mm, and the clearance between the helical blade and the periphery of the sampling tube 3 is 8mm.

The self-cleaning mechanical sampling head drives the sampling screw 4 to do rotary motion in the sampling cylinder 3 through a motor and a speed reducer, the lifting hydraulic cylinder lifts the mechanisms such as a descending motor, the speed reducer, the sampling cylinder 3 and the sampling screw 4 to do up-down reciprocating motion, the sampling cylinder 3 and the sampling screw 4 are together detected into a coal pile in an automobile or a fire carriage in the descending process of the sampling cylinder 3 and the sampling screw 4, the coal flow is lifted into a buffering bin at the top of the sampling screw 4 through uninterrupted rotation of the sampling screw 4, the mechanisms such as the motor, the speed reducer, the sampling cylinder 3 and the sampling screw 4 are lifted to an original position under the action of the lifting hydraulic cylinder, a coal sample buffering bin gate is opened, and a coal sample is conveyed to a next-stage mechanism.

The crushing head is connected to the lower end of the screw shaft of the sampling screw 4, the crushing head is transversely arranged, and a space is reserved between the crushing head and the inner wall of the sampling cylinder 3. The sampling process of the self-cleaning mechanical sampling head is that the sampling process of the self-cleaning mechanical sampling head has larger and harder stone or gangue in the inferior fuel, and the crushing head crushes the stone or gangue to avoid the stone or gangue from blocking the helical blade.

The cleaning tool bit is fixedly arranged on the edge of the helical blade of the sampling helix 4, the clearance between the cleaning tool bit and the sampling cylinder 3 is smaller than the clearance between the helical blade and the sampling cylinder 3, the cleaning alloy tool bit has certain dead weight after cutting the wall-mounted coal seam, and the cut wall-mounted coal seam can fall off freely.

Specifically speaking, the self rotary power through helical blade drives the tool bit that cleans on every blade and carries out linear motion, carries out effectual broken wall clearance to remaining deposited coal on the sampling tube 3 inner wall, cleans the tool bit and thoroughly breaks the pile up structure of wall built-up coal seam in the sampling tube 3 wall under the drive of sampling screw 4, makes it unable to form the wall built-up coal seam that link up from top to bottom, when sampling screw 4 carries the big batch coal stream, the coal stream extrudees the wall built-up coal seam that has broken wall and erodes and make it unable to form the adhesion with sampling tube 3 wall to reach incessantly continuous cleaning effect.

The self-cleaning mechanical sampling head provided by the utility model is mainly used for sampling and acceptance of inferior fuels such as coal slime, blending coal and the like of thermal power generation enterprises, and the device is suitable for sampling the inferior fuels and does not influence the sampling and acceptance capacities of other conventional fuels. The sampling screw 4 with the cleaning tool bit is additionally arranged, so that the sampling working conditions of various inferior fuels are adapted, the cleaning tool bit can break the wall of the wall-mounted coal seam on the wall of the sampling cylinder 3 under the working condition that the inferior fuel is high in water content or coal slime powder, and the problem that coal blockage between the screw blade and the cylinder wall occurs when the sampling screw blade of the sampling head takes coal slime or coal with high water content is solved. The crushing head is additionally arranged at the bottom of the sampling screw 4 and is used for crushing larger stones and gangue blocks in inferior fuel, and the blocking phenomenon of the screw blade and the wall of the sampling cylinder 3 caused by the stones and the gangue blocks is eliminated.

The cleaning tool bit comprises at least two schemes, in the first case, the cleaning tool bit is a U-shaped cleaning tool bit 1, and the middle opening of the U-shaped cleaning tool bit 1 is clamped on the edge of the spiral blade.

In some specific embodiments, the cleaning tool bit may be a U-shaped cleaning tool bit 1, for example, the size is 36mm×16mm, the middle opening of the U-shaped cleaning tool bit 1 is clamped on the edge of the spiral blade, and the U-shaped cleaning tool bit 1 is attached to the top end of the spiral blade, so that connection is convenient. After the connection, carrying out double-sided full welding on the spiral blade, wherein the welding part of the cutter head is 30mm higher than the top part of the spiral blade by 6mm; or by riveting, bolting, etc. The U-shaped cleaning tool bit 1 is parallel to the helical blade, so that the cleaning tool bit is convenient to cut into a wall-mounted coal seam on the wall of the sampling cylinder 3.

On the basis of the above-mentioned specific embodiments, both ends of the U-shaped cleaning head 1 are provided with chamfers.

In some embodiments, the two ends of the U-shaped cleaning tool bit 1 are chamfered, and the chamfering can enable the tool bit to cut into the wall-mounted coal seam on the wall of the sampling tube 3 more conveniently, better and faster, so that the efficiency is improved.

In the second case, the cleaning tool bit is a delta-shaped cleaning tool bit 2, the delta-shaped cleaning tool bit 2 comprises a triangular tool bit and a mounting plate fixedly connected with the triangular tool bit, and the upper surface of the mounting plate is fixedly attached to the lower surface of the helical blade.

In some embodiments, the cleaning tool bit may be a delta-type cleaning tool bit 2, for example, the size is 40mm×25mm×14mm, the plane portion of the delta-type cleaning tool bit 2 is attached to the lower portion of the spiral blade and welded fully around, and the welding angle of the delta-type cleaning tool bit 2 is consistent with the angle of the spiral blade. The delta-shaped cleaning tool bit 2 can enable the sampling spiral 4 to finish the process of cutting and expanding the wall-mounted coal seam on the wall of the sampling tube 3 with minimum resistance through sharp angles at two ends of the delta-shaped cleaning tool bit, so that the wall-mounted coal seam in the sampling tube 3 is easier to fall off.

In another more reliable embodiment, the cleaning blade and the helical blade are fixed by welding, riveting or bolting on the basis of any one of the above embodiments.

In some specific embodiments, the cleaning tool bit can be welded on the spiral blade, and the connection is firm; the cleaning tool bit and the helical blade can be connected through a bolt and can be detachably connected, and the cleaning tool bit can be independently replaced, so that the cost is reduced; the cleaning tool bit and the helical blade can be connected through riveting, so that the cleaning tool bit is convenient to connect and low in cost.

In another more reliable embodiment, on the basis of any of the above embodiments, a cleaning blade is fixed to the spiral blade at intervals of 180 ° or 90 °.

In some specific embodiments, the pitch of the spiral blades is designed to be 250mm, one cleaning tool bit is fixed at each interval of 180 degrees or 90 degrees of the spiral blades, the cleaning tool bit is guaranteed to be arranged on the height of the whole sampling cylinder 3, the wall breaking effect of the wall-mounted coal bed on the wall of the whole height of the cylinder is achieved by the cleaning tool bit of the spiral blades, and the phenomenon that coal is stuck to the wall of the sampling cylinder 3 is solved.

The specific working principle is as follows: if the inferior fuel is pulverized coal slime and the moisture content is large, the phenomenon that the inferior fuel hangs on a wall in the sampling cylinder 3 occurs in the process that the fuel is lifted by the spiral blade, so that an inferior fuel barrel which is penetrated up and down is formed, and overload tripping of the spiral blade sampling head motor is caused. The cleaning tool bit on the helical blade can carry out the effective cutting of linearity with the inferior fuel barrel that link up from top to bottom, carries the fuel that wall built-up hardened on the sampling tube 3 wall to next level device in together through helical blade promotes the fuel process to eliminate the powdered inferior fuel and stop up helical blade sampling head.

In another more reliable embodiment, on the basis of any one of the above embodiments, a material of the cleaning bit is a wear-resistant alloy.

In some embodiments, the cleaning tool bit may be a wear-resistant alloy tool bit, and the wear-resistant alloy tool bit may be made of NM400 or NM500 wear-resistant steel plate or manganese steel plate through surface chromium plating, so as to improve wear resistance and service life of the cleaning tool bit.

In another more reliable embodiment, on the basis of any one of the above embodiments, the gap between the end of the cleaning tool bit and the sampling tube 3 is 2mm-5mm.

In some specific embodiments, the gap between the top end of the cleaning tool bit and the wall of the sampling cylinder 3 is any value between 2mm and 5mm, including end point values such as 2mm, 3mm, 4mm and 5mm, the gap is moderate, and the cleaning tool bit can not only realize the wall breaking effect on the wall-hanging coal bed on the cylinder wall, but also solve the phenomenon of coal sticking on the wall of the sampling cylinder 3; but also can avoid the surface contact of the spiral blade and the coal bed on the wall of the sampling tube 3, and eliminate the extrusion state of the coal bed between the sampling spiral 4 and the wall of the sampling tube 3.

In another more reliable embodiment, on the basis of any one of the above embodiments, an alloy wear-resistant tool rest is additionally arranged at the bottom of the sampling screw 4, and the crushing head is fixed at the edge of a blade of the alloy wear-resistant tool rest.

In some embodiments, the spacing between the crushing head and the sampling cylinder 3 is greater than the clearance between the cleaning cutter head and the sampling cylinder 3, the crushing head crushes the stone or gangue entering the sampling cylinder 3, and the crushing head crushes the stone or gangue to avoid the stone or gangue from blocking the helical blade. The alloy wear-resistant tool rest is arranged at the lower end of the screw shaft of the sampling screw 4, the alloy wear-resistant tool rest is provided with blades, and the crushing head is fixed at the edge of the blades of the alloy wear-resistant tool rest, so that the crushing head is convenient to install. The cutting edge of crushing head is towards sampling tube 3, and the crushing head follows sampling spiral 4 rotation, and the crushing head of bottommost is parallel and level with the bottom surface of sampling tube 3, realizes the crushing to stone or waste rock at sampling tube 3 bottommost, and the operation face of crushing head is great.

In another more reliable embodiment, the connector is slidably coupled to the vertical rail based on any of the above embodiments.

In some specific embodiments, the vertical rail is fixedly arranged on the ground, the connecting frame is arranged on the vertical rail, the connecting frame is in sliding connection with the vertical rail, and the connecting frame is driven to move up and down along the vertical rail through the lifting hydraulic cylinder, so that the lifting and lowering motor, the speed reducer, the sampling cylinder 3, the sampling screw 4 and other mechanisms can reciprocate up and down, and the movement is smooth and stable.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.

The self-cleaning mechanical sampling head provided by the utility model is described in detail above. The principles and embodiments of the present utility model have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present utility model and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the utility model can be made without departing from the principles of the utility model and these modifications and adaptations are intended to be within the scope of the utility model as defined in the following claims. Thus, the present utility model is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a self-cleaning machinery sampling head, its characterized in that, including be fixed in sampling tube (3) on the link, insert sampling spiral (4) in sampling tube (3), drive sampling spiral (4) rotatory and fixed mounting is in drive arrangement on the link, drive the elevating gear that the link goes up and down, connect in broken head of sampling spiral (4) lower extreme, fixed mounting in the cleaning tool bit on the helical blade border of sampling spiral (4), cleaning tool bit with the clearance of sampling tube (3) is less than helical blade with the clearance of sampling tube (3).

2. The self-cleaning mechanical sampling head according to claim 1, wherein the cleaning tool bit is a U-shaped cleaning tool bit (1), and a middle opening of the U-shaped cleaning tool bit (1) is clamped on the edge of the spiral blade.

3. A self-cleaning mechanical sampling head according to claim 2, characterized in that the two ends of the U-shaped cleaning head (1) are provided with chamfers.

4. The self-cleaning mechanical sampling head according to claim 1, wherein the cleaning tool bit is a delta-shaped cleaning tool bit (2), the delta-shaped cleaning tool bit (2) comprises a triangular tool bit and a mounting plate fixedly connected with the triangular tool bit, and the upper surface of the mounting plate is fixedly attached to the lower surface of the helical blade.

5. The self-cleaning mechanical sampling head according to any one of claims 1 to 4, wherein the cleaning bit and the helical blade are fixed by welding, riveting or bolting.

6. The self-cleaning mechanical sampling head according to any one of claims 1 to 4, wherein one of the cleaning heads is fixed to the helical blade at every 180 ° or 90 °.

7. The self-cleaning mechanical sampling head according to any one of claims 1 to 4, wherein the cleaning head is made of a wear-resistant alloy.

8. A self-cleaning mechanical sampling head according to any one of claims 1 to 4, characterised in that the clearance between the end of the cleaning head and the cartridge (3) is 2mm to 5mm.

9. Self-cleaning mechanical sampling head according to any one of claims 1 to 4, characterized in that the bottom of the sampling screw (4) is additionally equipped with an alloy wear-resistant blade holder, the crushing head being fixed at the blade edge of the alloy wear-resistant blade holder.

10. The self-cleaning mechanical sampling head of any one of claims 1 to 4 wherein the carriage is slidingly coupled to a vertical rail.