阅读说明：本技术 采动裂缝井下导高观测系统及工作方法 (Mining crack underground height guiding observation system and working method ) 是由 赵秋阳 张玉军 宋业杰 樊振丽 李磊 申晨辉 张风达 王志晓 于秋鸽 程艳芳 于 2020-07-09 设计创作，主要内容包括：本发明实施例提供一种采动裂缝井下导高观测系统及工作方法。该观测系统包括：注推机构、胀封机构和探测机构,胀封机构分别连接于探测机构的两端,注推机构与胀封机构连接；探测机构包括连通管、容纳腔和减压阀组件,容纳腔位于连通管的端部,且胀封机构通过容纳腔与连通管连接,减压阀组件的一端与容纳腔连接,另一端与连通管外侧的探测段连通。该工作方法,可实现单水源高压胀封、低压探测和多种压力情况下的递进式探测。本发明实施例对于研究多压状态下的采动裂缝导水能力、精确探测导水裂缝带高度有着重要意义。(The embodiment of the invention provides a mining crack underground height guiding observation system and a working method. The observation system includes: the device comprises an injection pushing mechanism, an expansion sealing mechanism and a detection mechanism, wherein the expansion sealing mechanism is respectively connected to two ends of the detection mechanism, and the injection pushing mechanism is connected with the expansion sealing mechanism; the detection mechanism comprises a communicating pipe, an accommodating cavity and a pressure reducing valve assembly, the accommodating cavity is located at the end of the communicating pipe, the expansion sealing mechanism is connected with the communicating pipe through the accommodating cavity, one end of the pressure reducing valve assembly is connected with the accommodating cavity, and the other end of the pressure reducing valve assembly is communicated with a detection section outside the communicating pipe. The working method can realize single water source high-pressure expansion sealing, low-pressure detection and progressive detection under various pressure conditions. The embodiment of the invention has important significance for researching the water conductivity of the mining fracture in a multi-pressure state and accurately detecting the height of the water-conducting fracture belt.)

1. A mining fracture downhole height guiding observation system is characterized by comprising: the device comprises an injection pushing mechanism, an expansion sealing mechanism and a detection mechanism, wherein the expansion sealing mechanism is respectively connected to two ends of the detection mechanism, and the injection pushing mechanism is connected with the expansion sealing mechanism; wherein the content of the first and second substances,

the detection mechanism includes communicating pipe, holds chamber and pressure reducing valve subassembly, it is located to hold the chamber the tip of communicating pipe, just the bloated mechanism of sealing passes through hold the chamber with communicating pipe connects, pressure reducing valve subassembly's one end with hold the chamber and connect, the other end with the detection section intercommunication in the communicating pipe outside.

2. The mining crack downhole height guiding observation system according to claim 1, wherein the number of the containing cavities is two, the two containing cavities are respectively located at two ends of the communicating pipe, and the number of the pressure reducing valve assemblies is two, and the two pressure reducing valve assemblies are respectively connected to the containing cavities in a one-to-one correspondence manner.

3. A mining fracture downhole height guiding observation system as claimed in claim 2, wherein each set of pressure reducing valve assemblies comprises a plurality of pressure reducing valves, the plurality of pressure reducing valves being evenly spaced along the circumference of the cross section of the containment chamber.

4. The mining fracture downhole elevation observation system of claim 3, wherein the communicating tube is connected to a central location of the cross-section of the containment chamber.

5. The mining fracture downhole height guiding observation system according to claim 1, wherein the injection and push mechanism comprises a drilling machine and a drill rod, the drilling machine is connected with the drill rod, the drill rod is provided with a water injection pipeline, and the water injection pipeline is connected with the expansion sealing mechanism.

6. The mining fracture downhole height guidance observation system of claim 5, wherein the injection and push mechanism further comprises a water injection controller mounted at a water inlet end of the water injection pipeline.

7. The mining fracture downhole height guidance observation system of any one of claims 1-6, wherein the swell-seal mechanism is a plugging capsule.

8. A method of operating a mining fracture downhole height guidance observation system according to any of claims 1-7, comprising:

s1, pressurizing and injecting water by the injection and pushing mechanism, and expanding and sealing two ends of the detection mechanism by the expanding and sealing mechanism;

s2, continuing pressurizing and injecting water by the injecting and pushing mechanism, enabling the pressure of the expanding and sealing mechanism, the communicating pipe and the accommodating cavity to rise to a first preset pressure, opening the pressure reducing valve assembly, keeping the water injection pressure of the injecting and pushing mechanism at a second preset pressure and the pressure of the detection section at a third preset pressure, and observing and recording the water leakage condition;

s3, continuing pressurizing and injecting water by the injecting and pushing mechanism, enabling the pressure of the expanding and sealing mechanism, the communicating pipe and the accommodating cavity to rise to a fourth preset pressure, keeping the water injection pressure of the injecting and pushing mechanism at a fifth preset pressure and the pressure of the detection section at a sixth preset pressure, and observing and recording the water loss condition.

9. The method of operating a production fracture downhole elevation observation system of claim 8, further comprising:

s4, releasing pressure by the injection pushing mechanism and the expansion sealing mechanism, continuously drilling, entering the next detection section, and returning to the step S1.

Technical Field

The invention relates to the technical field of coal mine drilling, in particular to a mining crack underground height guiding observation system and a working method.

Background

After the coal seam is mined, the overlying strata are affected by mining and are discontinuously deformed and damaged, the overlying strata are broken and unstable to form a water guide crack zone, the height of the water guide crack zone is composed of a collapse zone and a crack zone, and rock strata in the water guide crack zone directly fill water into a mining space to form mine water gushing, so that an initial seepage field of an overlying strata aquifer is changed, and a mining seepage field is formed. From the perspective of safety and hydrogeology, the height of the water guide crack zone is the main technical parameters of predicting the water inflow of a mine pit, designing a water detection drilling hole and calculating a vertical waterproof coal pillar, has important theoretical significance and practical value for researching a roof water inrush mechanism, and is the most basic technical basis for mine safety production.

In the actual measurement method of the height of the water guide crack zone, the underground hole elevation observation device and the method are used as a novel technical method for successful experimental research, as shown in figure 1, the leakage amount of a water source in a crack in a hole is detected in a closed space by adopting a double-end water plugging device plugging mode, and compared with a ground drilling observation method, the method has the advantages of high drilling and observation speed, simple process, low engineering cost and the like. However, the existing downhole upward hole observation equipment circulated in the market has a great disadvantage that the downhole height guiding observation instrument needs to adopt the independent expansion pipeline 1 and the water injection pipeline 12 to inflate and seal the expansion capsule 2, the expansion pipeline 1 is easy to wind on a drill rod, the sealing and observation integration cannot be realized in the detection process, in addition, the prior art can only realize the observation of the leakage flow of each hole section of the drilled hole in a single pressure state, the test data is single and has no contrast, and the multi-pressure progressive detection of a low-pressure detection section is not researched.

Disclosure of Invention

The embodiment of the invention provides a mining crack underground height guiding observation system and a working method, which are used for solving the defects that the integration of plugging and observation cannot be realized and the observation of the leakage flow of each hole section of a drill hole only under a single pressure state can be realized in the prior art, can realize the double functions of single-water-source high-pressure expansion sealing and low-pressure detection, and can realize multi-pressure progressive detection of a low-pressure detection section.

The embodiment of the invention provides a mining crack underground height guiding observation system, which comprises: the device comprises an injection pushing mechanism, an expansion sealing mechanism and a detection mechanism, wherein the expansion sealing mechanism is respectively connected to two ends of the detection mechanism, and the injection pushing mechanism is connected with the expansion sealing mechanism; wherein the content of the first and second substances,

the detection mechanism includes communicating pipe, holds chamber and pressure reducing valve subassembly, it is located to hold the chamber the tip of communicating pipe, just the bloated mechanism of sealing passes through hold the chamber with communicating pipe connects, pressure reducing valve subassembly's one end with hold the chamber and connect, the other end with the detection section intercommunication in the communicating pipe outside.

The number of the containing cavities is two, the containing cavities are respectively located at two ends of the communicating pipe, the number of the pressure reducing valve assemblies is two, and the pressure reducing valve assemblies are respectively connected with the containing cavities in a one-to-one correspondence mode.

Each group of pressure reducing valve assemblies comprises a plurality of pressure reducing valves, and the pressure reducing valves are uniformly arranged along the circumferential interval of the cross section of the accommodating cavity.

Wherein, the communicating pipe is connected to the central position of the cross section of the accommodating cavity.

The injection pushing mechanism comprises a drilling machine and a drill rod, the drilling machine is connected with the drill rod, the drill rod is provided with a water injection pipeline, and the water injection pipeline is connected with the expansion sealing mechanism.

The water injection pushing mechanism further comprises a water injection controller, and the water injection controller is installed at the water inlet end of the water injection pipeline.

Wherein, the swelling mechanism is a plugging capsule.

The embodiment of the invention also provides a working method of the mining crack underground height guiding observation system, which comprises the following steps:

s1, pressurizing and injecting water by the injection and pushing mechanism, and expanding and sealing two ends of the detection mechanism by the expanding and sealing mechanism;

s2, continuing pressurizing and injecting water by the injecting and pushing mechanism, enabling the pressure of the expanding and sealing mechanism, the communicating pipe and the accommodating cavity to rise to a first preset pressure, opening the pressure reducing valve assembly, keeping the water injection pressure of the injecting and pushing mechanism at a second preset pressure and the pressure of the detection section at a third preset pressure, and observing and recording the water leakage condition;

s3, continuing pressurizing and injecting water by the injecting and pushing mechanism, enabling the pressure of the expanding and sealing mechanism, the communicating pipe and the accommodating cavity to rise to a fourth preset pressure, keeping the water injection pressure of the injecting and pushing mechanism at a fifth preset pressure and the pressure of the detection section at a sixth preset pressure, and observing and recording the water loss condition.

Wherein, still include:

s4, releasing pressure by the injection pushing mechanism and the expansion sealing mechanism, continuously drilling, entering the next detection section, and returning to the step S1.

According to the mining crack underground height guiding observation system and the working method provided by the embodiment of the invention, the expansion sealing mechanisms at two ends are connected through the communicating pipe of the detection mechanism, so that the single-water-source high-pressure expansion sealing can be realized; high-pressure water is changed into low-pressure water through a pressure reducing valve of the detection mechanism, so that low-pressure detection can be realized; by adjusting the water flow output pressure of the pressure reducing valve, progressive detection under various pressure conditions can be realized. The embodiment of the invention has important significance for researching the water conductivity of the mining fracture in a multi-pressure state and accurately detecting the height of the water-conducting fracture belt.

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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of a prior art downhole uphole viewing device;

FIG. 2 is a schematic structural diagram of a downhole height guidance observation system for a mining fracture according to an embodiment of the invention;

FIG. 3 is a schematic structural view of a capsule and a detection mechanism in an initial state according to an embodiment of the present invention;

FIG. 4 is a schematic illustration of the operating states of the first and second pressure relief valve assemblies in the initial state of the embodiment of the present invention;

FIG. 5 is a schematic structural view of a plugging capsule and a detection mechanism in a state that the plugging capsule is expanded;

FIG. 6 is a schematic diagram of the working states of the first and second pressure relief valve assemblies in the expanded state of the plugging capsule of the embodiment of the present invention;

FIG. 7 is a schematic structural view of a capsule and a detection mechanism in a first detection state according to an embodiment of the present invention;

FIG. 8 is a schematic illustration of the operating states of the first and second pressure relief valve assemblies in a first test state in accordance with an embodiment of the present invention;

FIG. 9 is a schematic structural view of a capsule and a detection mechanism in a second detection state according to the embodiment of the present invention;

figure 10 is a schematic view of the operation of the first and second pressure relief valve assemblies in a second detection state in accordance with an embodiment of the present invention.

Reference numerals:

in fig. 1: 1: expanding the pipeline; 12: a water injection pipeline; 2: and (4) making capsules.

In fig. 2-10: 100: a injecting and pushing mechanism; 11: a drilling machine; 12: a water injection pipeline; 13: a water injection controller; 200: plugging the capsule; 300: a detection mechanism; 31: a communicating pipe; 32: a first accommodating chamber; 33: a second accommodating chamber; 34: a first pressure relief valve assembly; 35: a second pressure relief valve assembly.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.

A mining fracture downhole height guiding observation system according to an embodiment of the invention is described below with reference to fig. 2, comprising: the device comprises an injection pushing mechanism 100, an expansion sealing mechanism and a detection mechanism 300, wherein the expansion sealing mechanism is respectively connected to two ends of the detection mechanism 300, and the injection pushing mechanism 100 is connected with the expansion sealing mechanism; wherein the content of the first and second substances,

detection mechanism 300 includes communicating pipe 31, holds chamber and relief pressure valve assembly, holds the tip that the chamber is located communicating pipe 31, and the swell-seal mechanism is connected with communicating pipe 31 through holding the chamber, and relief pressure valve assembly's one end with hold the chamber and be connected, the other end and the detection section intercommunication in the communicating pipe 31 outside.

Specifically, the injection and push mechanism 100 in this embodiment is connected to a high-pressure water source, and is configured to introduce the high-pressure water source into the expansion sealing mechanism; the expansion sealing mechanism performs expansion sealing and plugging on two ends of the detection mechanism 300. Wherein, the end parts of the expansion sealing mechanism and the detection mechanism 300 are provided with clamping grooves, and the two are connected through the clamping grooves.

Further, the expansion sealing mechanisms at the two ends of the detection mechanism 300 are communicated through the communication pipe 31 of the detection mechanism 300, so that high-pressure water can be conveyed from the expansion sealing mechanism at one end to the expansion sealing mechanism at the other end, and the balance and the equality of the water pressure in the expansion sealing mechanisms at the two ends are realized. Wherein, the communicating pipe 31 is located in the central position of the whole part of the detecting mechanism 300, the outer diameter of the communicating pipe 31 is smaller than the expanding sealing mechanism, the space between the communicating pipe 31 and the drill hole is a detecting section, because the two ends of the communicating pipe 31 are sealed by the expanding sealing mechanism, the water output by the pressure reducing valve can only go to the rock wall around the drill hole, if there is a crack, the water output is more, if the rock wall is complete, the water output is less, the leakage quantity of the water is monitored through the flow meter of the water injection controller 13, and the development degree of the crack is reflected. The communicating pipe 31 is used for connecting the expansion sealing mechanisms at the two ends, and single water source high-pressure expansion sealing can be realized. The holding cavity is connected to the end of the communicating pipe 31, and the holding cavity is used for temporarily storing high-pressure water, so that the high-pressure water can be introduced into the communicating pipe 31 on one hand, and the high-pressure water can be provided for the pressure reducing valve on the other hand. The working state of the pressure reducing valve can control the observation condition, for example, when the pressure reducing valve is closed, high-pressure water cannot be introduced into the detection section from the pressure reducing valve and is in an initial non-observation state; the pressure reducing valve is opened, so that high-pressure water is changed into low-pressure water and enters the detection section, low-pressure detection can be realized, and progressive detection under various pressure conditions can be realized by controlling the pressure reducing valve to output water flows with different pressures. If a pressure-adjustable pressure reducing valve is adopted, the pressure-adjustable pressure reducing valve can be realized by the following methods:

1. the pressure reducing valve is internally provided with a pressure regulating valve, and the required pressure is set according to the actual use condition, and the pressure regulating valve is similar to a pressure adjustable pressure reducing valve structure (application number: CN201520697674.1) in a patent publication;

2. the pressure is adjusted by adjusting the spring force of a spring arranged in the pressure reducing valve, and the pressure is adjusted by adjusting different height positions of an adjusting bolt in a pressure limiting sleeve, so that the pressure difference between a pressure cavity in front of the valve and a pressure cavity in back of the valve is changed, and within the pressure reducing capacity range of the pressure reducing valve, the lower the position of the adjusting bolt relative to the pressure limiting sleeve is, the larger the pressure reducing capacity of the pressure reducing valve is, and the smaller the pressure reducing capacity of the pressure reducing valve is otherwise;

3. the mode of parallel output of a plurality of valve bodies or the mode of parallel output of a plurality of springs can be adopted to realize various pressure regulating functions.

According to the mining crack underground height guiding observation system provided by the embodiment of the invention, the expansion sealing mechanisms at two ends are connected through the communicating pipe 31 of the detection mechanism 300, so that single water source high-pressure expansion sealing can be realized; the high-pressure water is changed into low-pressure water through the pressure reducing valve of the detection mechanism 300, so that low-pressure detection can be realized; by adjusting the water flow output pressure of the pressure reducing valve, progressive detection under various pressure conditions can be realized. The embodiment of the invention has important significance for researching the water conductivity of the mining fracture in a multi-pressure state and accurately detecting the height of the water-conducting fracture belt.

The injection pushing mechanism 100 comprises a drilling machine 11 and a drill rod, wherein the drilling machine 11 is connected with the drill rod, the drill rod is provided with a water injection pipeline 12, and the water injection pipeline 12 is connected with an expansion sealing mechanism. In the embodiment, high-pressure water is directly output through the water injection pipeline 12, so that the expansion pipeline is omitted, and the defect that the expansion pipeline is wound on a drill rod is overcome.

The injection pushing mechanism 100 further comprises a water injection controller 13, and the water injection controller 13 is installed at the water inlet end of the water injection pipeline 12. Specifically, the water injection controller 13 in the present embodiment includes a pressure sensor for monitoring the water pressure, a water pump for regulating the water pressure, and a flow meter for monitoring the water flow rate. The water pressure is adjusted and monitored from the water inlet end of the water injection pipeline 12, and the water pump is controlled to output the water pressure by calculating the hydrostatic pressure difference, so that the high-pressure water entering the expansion sealing mechanism meets the observation requirement. The water flow rate is monitored through a flow meter, and the development degree of the crack is reflected.

Wherein, the expanding and sealing mechanism is a sealing capsule 200. It is understood that other occlusion devices may be used in place of the occlusion capsule 200, depending on the actual detection requirements, and the invention is not limited thereto.

Wherein, the number that holds the chamber is two, and two hold the chamber and lie in communicating pipe 31's both ends respectively, and relief pressure valve assembly's number is two sets of, and respectively one-to-one connects in holding the chamber. Specifically, in this embodiment, the first accommodating chamber 32 and the second accommodating chamber 33 are respectively disposed at two ends of the communication pipe 31, high-pressure water of the expansion sealing mechanisms at the two ends is temporarily stored in the first accommodating chamber 32 and the second accommodating chamber 33, the corresponding pressure reducing valve assemblies include the first pressure reducing valve assembly 34 and the second pressure reducing valve assembly 35, the first pressure reducing valve assembly 34 and the second pressure reducing valve assembly 35 have different specifications, different opening pressures and stable pressure reducing values are realized by different built-in spring assemblies and the difference between the cross sections of the two sides, low-pressure water can be output from two directions respectively, and the water pressures output by the first pressure reducing valve assembly 34 and the second pressure reducing valve assembly 35 are different, so that pressure control is more convenient to realize multi-pressure detection.

Wherein, every group relief valve subassembly includes a plurality of relief pressure valves, and a plurality of relief pressure valves are evenly arranged along the circumference interval of holding the chamber cross section. Specifically, each group of pressure reducing valve assemblies may be two, three or four pressure reducing valves, and if the pressure reducing valves are two, the pressure reducing valves are respectively fixed to the upper end and the lower end of the cross section of the accommodating cavity, and if the pressure reducing valves are four, the pressure reducing valves are respectively fixed to the upper end, the lower end, the left end and the right end of the cross section of the accommodating cavity. It will be appreciated that a person skilled in the art may select other numbers of pressure reducing valves to be arranged accordingly, according to the actual needs, and the invention is not limited thereto.

Wherein the communication pipe 31 is connected to a central position of the cross section of the receiving chamber. Since the pressure reducing valve needs to convert the high pressure water into the low pressure water and output the low pressure water to the detection section outside the communication pipe 31, the pressure reducing valve should face the space outside the communication pipe 31, and the communication pipe 31 is located at the center of the cross section of the receiving chamber.

The embodiment of the invention also provides a working method of the mining crack underground height guiding observation system according to the embodiment, which comprises the following steps:

s1, pressurizing and injecting water by the injection and push mechanism 100, and sealing two ends of the detection mechanism 300 by the expansion mechanism;

s2, continuing pressurizing and injecting water by the injecting and pushing mechanism 100, enabling the pressure of the expanding and sealing mechanism, the communicating pipe 31 and the accommodating cavity to rise to a first preset pressure, opening the pressure reducing valve assembly, keeping the water injection pressure of the injecting and pushing mechanism 100 at a second preset pressure and keeping the pressure of the detection section at a third preset pressure, and observing and recording the water leakage condition;

s3, continuing pressurizing and injecting water by the injecting and pushing mechanism 100, enabling the pressure of the expanding and sealing mechanism, the communicating pipe 31 and the accommodating cavity to rise to a fourth preset pressure, keeping the water injection pressure of the injecting and pushing mechanism 100 at a fifth preset pressure and keeping the pressure of the detection section at a sixth preset pressure, and observing and recording the water leakage condition;

s4, the injection pushing mechanism 100 and the expansion sealing mechanism are decompressed, drilling is continued, the next detection section is entered, and the step S1 is returned.

Take the case where the accommodation chamber and the pressure reducing valve assembly are respectively arranged in two as an example:

as shown in fig. 3 to 10 (in the drawings, arrows represent the flow direction of water, and the "open state" and the "closed state" refer to the working state of the pressure reducing valve respectively), the working method of the fractured downhole height guiding observation system in the embodiment includes:

s1, constructing a plurality of drill holes with specified angles in a coal rock roadway in sequence by ascending the drill holes downwards, wherein the hole depth is determined according to actual conditions such as working face mining thickness, drill hole angle, construction site and the like;

s2, installing the mining crack downhole height guiding observation system, sequentially connecting the detection mechanism 300 and the expansion sealing mechanism with a top drill rod of the injection and push mechanism 100, enabling a communicating perforated pipe in the two plugging capsules 200 to be communicated with the first containing cavity 32, the first containing cavity 32 and the communicating pipe 31 between the first containing cavity and the first containing cavity, connecting the drill rods through the operation of the downhole drill rig 11, pushing the drilling rods to a detection section, and enabling the first pressure reducing valve assembly 34 and the second pressure reducing valve assembly 35 to be in a closed state (as shown in figures 3 and 4);

s3, after the system is connected, calculating the hydrostatic pressure difference, connecting the water injection pipeline 12 with a high-pressure water source, starting to inject water into the injection and push mechanism 100 until the pressure of the plugging capsule 200 is increased to 1.5-2.0 MPa, starting the operation of the plugging capsule 200, and effectively expanding and sealing two ends of the detection section (as shown in figures 5 and 6);

s4, after the expansion sealing work of the sealing capsule 200 is finished, continuously pressurizing until the pressure of the sealing capsule 200, the first containing cavity 32 and the second containing cavity 33 reaches 2.0MPa, the first pressure reducing valve assembly 34 is opened, the second pressure reducing valve assembly 35 is closed, the water injection high pressure is kept at about 2.3MPa, the fixed low pressure of the detection section is maintained at 0.1MPa, the detection section starts to observe under the water pressure of 0.1MPa after stabilization, the observation is stopped after 30S of observation, and water leakage data are recorded (as shown in fig. 7 and 8);

s5, after completing low-pressure primary detection, continuously pressurizing until the pressure of the plugging capsule 200, the first containing cavity 32 and the second containing cavity 33 reaches 2.5MPa, the first pressure reducing valve assembly 34 is closed, the second pressure reducing valve assembly 35 is opened, the water injection high pressure is kept at about 2.6MPa, the fixed low pressure of the detection section is maintained at 0.2MPa, the detection section starts to observe under the water pressure of 0.2MPa after stabilization, the observation is stopped after 30S of observation, and water leakage data are recorded (as shown in fig. 9 and 10);

s6, after the detection and the recording are finished, the injection and push mechanism 100 carries out pressure relief operation, the plugging capsule 200 is decompressed and restored to the original state, the first pressure relief valve assembly 34 and the second pressure relief valve assembly 35 are closed, the injection and push mechanism 100 is connected with a drill rod continuously and pushes the drilling rod continuously to enter the next detection section, and the process is repeated.

The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.