Device and method for judging jamming of telescopic blanking pipe

Abstract

The invention relates to a device and method for judging jamming of a telescopic blanking pipe, the device comprises at least one section of blanking pipe which can be telescopically connected, the outer wall of each section of blanking pipe is provided with a reflective strip, and the reflective strips are used for judging whether materials adhere to the outer wall of the blanking pipe or not according to the reflective effect. The telescopic blanking pipe comprises a plurality of sections of blanking pipes, the telescopic length of each section of blanking pipe is detected through scale marks so as to reflect the jamming condition of the telescopic blanking pipe, for any section of blanking pipe, the reflective stripes comprise a vertical reflective stripe arranged in the axial direction of the blanking pipe and at least one transverse reflective stripe perpendicular to the vertical reflective stripe, and the vertical reflective stripe is arranged in the axial direction of the blanking pipe. And the telescopic length of the blanking pipe is formed.

Description

Technical Field

[0001] The present invention relates to the technical field of material conveying, and particularly to a device and a method for judging the jamming of a telescopic blanking pipe. Background Art

[0002] The blanking pipe is a commonly used device in industrial production for conveying materials from a high place to a low place, and it mainly relies on the gravity and kinetic energy of the materials themselves to achieve transportation. When the materials fall from a high place, they obtain speed under the action of gravity and are converted into kinetic energy, prompting the materials to continuously move in the blanking pipe until they reach the designated position. Among them, the telescopic blanking pipe, with its retractable and stretchable characteristics, can flexibly adjust the stacking height of the materials and is widely used in fields such as warehousing and conveying.

[0003] However, during the contraction or extension process of the telescopic blanking pipe, due to the tendency of materials (especially viscous materials) to adhere to the inner wall of the blanking pipe, the telescopic movement of the pipe body is blocked, leading to jamming. In the prior art, there is a lack of intuitive and effective detection means for judging the jamming of the telescopic blanking pipe. Usually, it relies on regular manual inspections or passive maintenance after equipment abnormalities, and it is impossible to timely detect the problem of material adhesion on the inner wall and poor telescopic movement of the pipe body. If the jamming phenomenon is not detected in time, it may cause the telescopic structure to operate forcibly, resulting in equipment wear, deformation, or even damage, affecting production efficiency and increasing maintenance costs.

[0004] Therefore, how to judge in real time whether the telescopic blanking pipe is jammed in a simple and reliable manner so as to take cleaning or maintenance measures in time has become an urgent technical problem in this field. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a device and a method for judging the jamming of a telescopic blanking pipe. By setting reflective strips on the outer wall of the blanking pipe and using the reflective effect and scale markings to detect the material adhesion situation and telescopic length in real time, the rapid and accurate judgment of the jamming phenomenon is realized, and the problem that the telescopic blanking pipe is jammed due to material adhesion on the inner wall and lacks intuitive and effective detection means is solved or partially solved.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] In one aspect of the present invention, a device for judging the jamming of a telescopic blanking pipe is provided, which includes at least one section of telescopically connected blanking pipes. Reflective strips are provided on the outer walls of each section of the blanking pipes. The reflective strips are used to judge whether materials adhere to the outer wall of the blanking pipe through the reflective effect, and detect the telescopic length of each section of the blanking pipes through scale markings to reflect the jamming situation of the telescopic blanking pipe.

[0008] Among them, for any section of the blanking pipe, the reflective strip includes a vertical reflective strip arranged along the axial direction of the blanking pipe and at least one transverse reflective strip perpendicular to the vertical reflective strip, constituting the telescopic length of the blanking pipe.

[0009] As a preferred technical solution, the scale is used to calibrate the telescopic stroke range of each section of the blanking pipe, and whether the blanking pipe is extended or contracted in place is judged by observing the exposed length of the scale.

[0010] As a preferred technical solution, the reflective strip is a reflective film, reflective paint or reflective patch, and the reflective effect of the reflective strip changes with the thickness of the material adhered to the outer wall of the blanking pipe.

[0011] As a preferred technical solution, it includes at least one of the vertical reflective strips, and the reflective strips of adjacent two sections of the blanking pipe are arranged in alignment or stagger to distinguish the telescopic states of different sections.

[0012] As a preferred technical solution, it further includes a detection device, which is used to collect the reflective image or reflective signal of the reflective strip, and the detection device includes a camera, a laser sensor or an infrared sensor.

[0013] As a preferred technical solution, it further includes a control system, which is electrically connected to the detection device and is used to judge whether the telescopic blanking pipe is jammed according to the change of the reflective effect of the reflective strip and / or the change of the position of the scale mark, and generate a jam warning signal.

[0014] As a preferred technical solution, the control system presets a reflective intensity threshold and / or a scale displacement threshold. When the reflective intensity collected by the detection device is lower than the reflective intensity threshold and / or the displacement amount of the scale mark is less than the scale displacement threshold, it is determined that the telescopic blanking pipe is jammed.

[0015] In the device, the reflective strip has a dual function:

[0016] (1) Material adhesion detection: The reflective strip is made of a reflective material, such as a reflective film, reflective paint or reflective patch, and its reflective effect changes with the thickness of the material adhered to the outer wall of the blanking pipe. When the inner wall material adhesion causes the outer wall to be covered or contaminated, the reflective intensity of the reflective strip decreases, and whether there is material adhesion can be intuitively judged by observing or detecting the reflective effect.

[0017] (2) Telescopic length detection: The reflective strip is a strip structure with scales, and the scales calibrate the telescopic stroke range of each section of the blanking pipe, such as the reference positions of full extension and full contraction. By observing the exposed length or position change of the scale, the actual telescopic state of each section of the blanking pipe can be determined, such as whether it is fully extended or contracted in place.

[0018] Another aspect of the present invention provides a method for judging the jamming of the telescopic blanking pipe, which is realized based on the aforementioned device for judging the jamming of the telescopic blanking pipe. The method includes the following steps:

[0019] Install reflective strips on the outer walls of each section of the blanking pipe, and the reflective strips are provided with scales for calibrating the telescopic stroke;

[0020] Judge whether the outer wall of the blanking pipe is adhered with materials by observing or detecting the reflective effect of the reflective strip;

[0021] Determine the actual telescopic length of each section of the blanking pipe by observing or detecting the scale markings of the reflective strip, and further judge whether the telescopic blanking pipe is jammed.

[0022] As a preferred technical solution, the step of judging material adhesion by observing or detecting the reflective effect of the reflective strip includes:

[0023] Use a detection device to collect the reflective image or reflective signal of the reflective strip;

[0024] Compare the collected reflective intensity with a preset reflective intensity threshold. If the reflective intensity is lower than the threshold, it is determined that the outer wall of the blanking pipe is adhered with materials, which may cause jamming.

[0025] As a preferred technical solution, the step of determining the telescopic length by scale markings and judging jamming includes:

[0026] Record the initial scale positions of each section of the blanking pipe in the fully extended or contracted state;

[0027] Detect the current position of the scale markings in real time or periodically, and calculate the displacement between the current position and the initial position;

[0028] If the displacement is less than a preset scale displacement threshold, it is determined that the telescopic blanking pipe is jammed.

[0029] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0030] (1) It has the ability of dual detection: The reflective strip of the present invention has both the functions of material adhesion detection and telescopic length detection. The change of the reflective effect intuitively reflects the adhesion of materials on the inner wall, and the telescopic stroke is quantified by the scale markings, realizing multi-dimensional judgment of the jamming problem. Through the change of the reflective intensity of the reflective strip and the detection of the scale displacement, early warning can be given at the initial stage of jamming, such as slight material adhesion and slight telescopic obstruction, to avoid damages such as wear and deformation caused by forced operation of the equipment.

[0031] (2) Simple and reliable structure: The present invention does not require complex sensors or built-in detection devices. Detection can be achieved only through the reflective strips on the outer wall and external detection equipment, which reduces costs and facilitates installation and maintenance. Through the positions and scales of the reflective strips on each section, the specific section where jamming occurs can be clearly indicated, shortening the fault location time and providing a basis for targeted cleaning or repair.

[0032] (3) Strong real-time performance and adaptability: The present invention supports manual visual inspection or automated monitoring, can detect jamming hazards in real time, avoids the lag and subjectivity of traditional manual inspections, is applicable to various conveying scenarios of viscous materials, and can be adapted to different specifications of telescopic feed pipes by adjusting the material of the reflective strips, scale accuracy, and detection equipment configuration, having broad industrial application value. Description of the Drawings

[0033] Figure 1 It is a schematic diagram of the telescopic feed pipe in the embodiment;

[0034] Figure 2 It is a schematic diagram of the vertical reflective strip and the horizontal reflective strip in the embodiment;

[0035] Figure 3 It is a flowchart of the method for judging the jamming of the telescopic feed pipe in the embodiment;

[0036] Figure 4 It is a schematic diagram of the electronic device in the embodiment. Detailed Embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0038] Embodiment 1

[0039] Regarding the problems existing in the foregoing prior art, see Figure 1 - Figure 2 , this embodiment provides a device for judging the jamming of a telescopic feed pipe. As Figure 1 shown is a schematic diagram of the telescopic feed pipe in a fully contracted state. The telescopic feed pipe includes a plurality of telescopically sleeved feed pipe bodies. A vertical reflective strip is pasted at the central position along the axial direction on the outer wall of each feed pipe section. The vertical reflective strip is made of a high-strength reflective film material. In addition, a plurality of horizontal reflective strips perpendicular to the vertical reflective strip are provided to form scales, and the scale range covers the maximum telescopic stroke of each feed pipe section. For example, the fully contracted position of the middle section corresponds to scale 0, and the fully extended position corresponds to scale X mm. The reflective strips of adjacent two feed pipe sections are aligned in position when sleeved, so as to observe the relative telescopic state of each pipe body section.

[0040] In actual use, the device can be used to judge material adhesion and detect telescopic length.

[0041] Material adhesion judgment: When the inner wall of the drop tube is adhered to sticky materials, the materials will gradually accumulate and cover the outer wall, causing the reflective effect of the reflective strip to weaken. The operator visually observes the reflective brightness of the reflective strip. If the reflective strip of a certain section of the tube is partially or completely dim, it can be judged that the outer wall of the area may be adhered to materials, and further inspection of the inner wall is required.

[0042] Telescopic length detection: The telescopic state is determined by observing the exposure of the scale. For example, when the device needs to be fully extended, the scale of the last section of the drop tube should show X mm. If the actual scale is less than X mm, it indicates that the extension of the tube body of this section is blocked and there is a possibility of jamming.

[0043] This device is suitable for small and medium-sized production lines with high manual inspection frequency and equipment layout that is convenient for visual observation. It can achieve basic jam warning through the setting of low-cost reflective strips.

[0044] Example 2

[0045] On the basis of Example 1, this example realizes automatic detection based on image recognition by adding detection equipment and control system.

[0046] Specifically, a high-definition camera is installed on the top or bottom, with the lens facing the reflective strip area on the outer wall of the drop tube, to collect the reflective strip image in real time. The control system has a built-in image processing module, which pre-stores standard images of each section of the drop tube in a fully extended / contracted state, including a scale reference position and a reflective intensity reference value, and sets a reflective intensity threshold (which can be 70% of the standard value) and a scale displacement threshold (which can be 10% of the normal stroke).

[0047] In actual use, the camera periodically captures the image of the reflective strip and transmits it to the control system. The image processing module calculates the average reflective intensity of the reflective strip area in the image. If the reflective intensity of a section of the tube is lower than the preset threshold, it is determined that the outer wall of the tube section is adhered to the material, triggering a material cleaning warning. The displacement is calculated by identifying the current position of the scale and the reference position in the standard image, such as the X mm scale line when fully extended. If the displacement is less than the scale displacement threshold, it is determined that the extension and retraction of the tube section is blocked, a jam alarm signal is generated, and the jammed section is displayed on the display.

[0048] This embodiment is applicable to large-scale automated production lines, which can realize unmanned monitoring throughout the day through image recognition technology, accurately locate stuck sections, and link the central control system to shut down and prompt maintenance.

[0049] Example 3

[0050] Based on Embodiment 2, in this embodiment, the camera in the embodiment is replaced with a laser displacement sensor and a reflectance intensity sensor. Among them, the laser displacement sensor is installed along the axial direction of the blanking pipe, emits a laser beam to the surface of the reflective strip, and measures the telescopic displacement of each pipe body in real time. The reflectance intensity sensor is vertically aligned with the reflective strip to collect the reflected light intensity of the reflective strip in real time. The control system is built-in with a dual-sensor data fusion algorithm to comprehensively judge jamming by combining displacement data and reflectance intensity data.

[0051] In actual use, the laser displacement sensor accurately calculates the real-time telescopic length of high precision of each blanking pipe by detecting the position change of the scale. If the displacement amount is less than the preset small displacement threshold within 3 consecutive detection cycles, it is determined that the telescopic stagnation occurs. The reflectance intensity sensor monitors the reflectance value of the reflective strip in real time. If the reflectance value drops by more than 30% within 10 minutes and the displacement detection synchronously shows telescopic stagnation, it is comprehensively determined that the jamming is caused by material adhesion. The control system sends a shutdown instruction to the PLC through the industrial bus and issues an audible and visual alarm through the alarm, accompanied by the jamming section number and possible reasons.

[0052] Embodiment 4

[0053] Based on Embodiments 1-3, in this embodiment, the reflective strip adopts a combined reflective strip. For multi-layer telescopic blanking pipes, such as ultra-long stroke pipe bodies with more than 5 sections, a segmented reflective strip is designed:

[0054] Two reflective strips are arranged on the outer wall of each blanking pipe, one at the top and one at the bottom. The scale of the top reflective strip is marked with the upward stretching stroke, and the scale of the bottom reflective strip is marked with the downward contraction stroke. The reflective strips of adjacent pipe bodies have different colors. Optionally, the upper pipe body uses a yellow reflective film and the lower one uses a red reflective film, which is convenient for quickly distinguishing the telescopic states of different sections.

[0055] Through the upper and lower double reflective strips and color distinction, the operator can observe the scale from different perspectives, such as looking down from a height or looking up from the ground, to solve the problem of multi-layer pipe body occlusion; the color coding mechanism shortens the section identification time during manual inspection and improves the maintenance efficiency.

[0056] Embodiment 5

[0057] On the basis of the foregoing embodiments, referring to Figure 3 , this embodiment provides a method for judging the jamming of a telescopic blanking pipe, which is realized based on the device for judging the jamming of a telescopic blanking pipe described above. The method includes the following steps:

[0058] Step S1, install a reflective strip on the outer wall of each blanking pipe, and the reflective strip is provided with a scale for calibrating the telescopic stroke.

[0059] On the outer wall of each section of the telescopic blanking pipe, stick a reflective strip with scales along the axial direction. The scale range covers the maximum telescopic stroke of this section of the pipe. For example, when the reference section is fully retracted, the scale shows 0 mm, and when it is fully extended, it shows X mm. Record the scale reference values of each section of the pipe in the fully extended / retracted state in the equipment manual.

[0060] Step S2, by observing the reflection effect of the reflective strip, determine whether there is material adhesion on the outer wall of the blanking pipe.

[0061] The operator regularly observes the reflection effect of the reflective strip during the operation of the blanking pipe. If the reflection on the surface of the reflective strip is uniform and bright, it indicates that there is no obvious material adhesion on the outer wall. If the local or overall reflective strip shows dim, blurred or has traces of material covering, such as the adhesion of pulverized coal or ore powder, it is determined that the outer wall of this section of the pipe is adhered with material, which may cause jamming.

[0062] Step S3, by observing the scale markings of the reflective strip, determine the actual telescopic length of each section of the blanking pipe, and then judge whether the telescopic blanking pipe is jammed.

[0063] When the blanking pipe needs to be fully extended, the scale of the last section of the pipe should reach the reference value, such as X mm. If the actual scale shows less than X mm and there is no change, it indicates that the extension of this section of the pipe is blocked and there is jamming. When the blanking pipe needs to be fully retracted, the scale of the first section of the pipe should return to 0 mm. If it shows greater than 0 mm, it indicates that the retraction is not in place, which may be caused by adhesion or mechanical resistance resulting in jamming.

[0064] If signs of material adhesion and abnormal telescopic length are detected simultaneously, or a single indicator is continuously abnormal, such as the scale displacement stagnates for more than 10 minutes, it is determined that this section of the pipe is jammed, triggering the manual cleaning or equipment shutdown and maintenance process.

[0065] The method of this embodiment is applicable to small production lines or scenarios mainly relying on manual inspection. It relies on low-cost visual observation to achieve basic jamming judgment, with simple operation and no need for additional electronic equipment.

[0066] Embodiment 6

[0067] On the basis of Embodiment 5, this embodiment further realizes automatic jamming judgment based on image recognition.

[0068] Specifically, step S2 includes steps S201 - S202:

[0069] Step S201, use the detection equipment to collect the reflection image or reflection signal of the reflective strip;

[0070] Step S202, compare the collected reflection intensity with a preset reflection intensity threshold. If the reflection intensity is lower than the threshold, it is determined that there is material adhesion on the outer wall of the blanking pipe, which may cause jamming.

[0071] Step S3 may be steps S301-S302:

[0072] Step S301, recording the initial scale position of each section of the blanking tube in a fully extended or contracted state.

[0073] Step S302, detecting the current position of the scale mark in real time or periodically, and calculating the displacement between the current position and the initial position.

[0074] Step S303: If the displacement is less than a preset scale displacement threshold, it is determined that the telescopic blanking tube is stuck.

[0075] Before the formal test, as in Example 5, a reflective strip with scale is installed on the outer wall of the blanking tube, and a high-definition camera is installed on the top or side of the device, with the lens aimed at the reflective strip area to ensure that the reflective strips of each section of the tube are within the shooting range. The control system pre-stores the standard image of each section of the tube in the fully extended / contracted state, records the scale reference position of the reflective strip in the standard image, and obtains the reflective intensity reference value by quantizing the image grayscale value.

[0076] During the formal inspection, the camera collects images of the reflective strips at a frequency of 10 frames per second and transmits them to the control system for processing. The average grayscale value of the reflective strip area in the image is calculated. If the grayscale value of a section of the tube is lower than the preset threshold and the signal is detected for 3 consecutive frames, it is determined that the material is adhered to the outer wall of the tube section, and the material adhesion judgment is realized. The scale numbers or scale line positions are identified through OCR technology, and the displacement between the current scale and the reference position is calculated. If the displacement is less than 10% of the maximum stroke of the tube section and remains unchanged for 5 minutes, it is determined that the telescopic movement is blocked, and the telescopic length is judged. When the material adhesion signal and the telescopic obstruction signal are triggered at the same time, or a single signal continues to exceed the limit, the control system generates a jam warning, displays the jammed segment, and links the equipment PLC to suspend the telescopic action of the blanking tube, prompting the operator to clean the material or check the mechanical structure.

[0077] The method of this embodiment is applicable to medium-sized automated production lines. It realizes unmanned monitoring throughout the day through image recognition technology, solves the problems of low frequency of manual inspections and large subjective judgment errors, and improves the real-time and accuracy of detection.

[0078] Example 7

[0079] On the basis of Embodiments 5 and 6, this embodiment further implements high-precision jamming judgment based on multi-sensor fusion, including the following steps:

[0080] (1) Sensor configuration: A dual-function reflective strip is pre-installed on the outer wall of the blanking tube, and a laser displacement sensor is deployed to measure the axial telescopic displacement. In addition, an infrared reflective intensity sensor is deployed to vertically measure the reflectivity of the reflective strip. The sensor signal is connected to the industrial control computer.

[0081] (2) Initialization of reference parameters: Record the displacement-time curve and the reference value of the reflected light intensity of each pipe section in the state of no adhesion and free expansion and contraction, and set the jamming judgment threshold. The threshold includes a displacement threshold and a reflected light intensity threshold. Optionally, the displacement threshold is that the displacement amount is <1 mm within 20 consecutive seconds, and at this time, it is regarded as the stagnation of expansion and contraction. The reflected light intensity threshold is that the reflectivity <60%, and at this time, it is regarded as serious material coverage.

[0082] (3) Real-time acquisition and fusion of multi-source data: The laser displacement sensor collects the real-time displacement data of each pipe section at a frequency of 100 Hz, and the infrared sensor collects the reflected light intensity data at a frequency of 50 Hz. The control computer fuses the two types of data through the Kalman filtering algorithm. If the displacement curve of a certain pipe section shows a plateau, that is, the speed ≤ 0.1 mm / s, and the reflected light intensity synchronously drops below the threshold, it is determined that the jamming is caused by material adhesion. If the displacement curve is abnormal but the reflected light intensity is normal, further judge whether it is a mechanical component jam, and trigger a structural overhaul warning.

[0083] (4) Warning and handling: The control system outputs a three-level warning according to the severity of the jamming.

[0084] The first-level warning corresponds to the situation of slight adhesion under this warning. The reflected light intensity drops to 70%-85%, and the displacement is normal, prompting "Advance the regular cleaning plan".

[0085] The second-level warning corresponds to moderate jamming under this warning. The reflected light intensity is 60%-70%, and the displacement amount <20% of the stroke, triggering "Reduce speed and prepare to stop".

[0086] The third-level warning corresponds to severe jamming under this warning. The reflected light intensity <60% and the displacement stagnates. Immediately stop the machine and start the sound and light alarm, and push the position of the jammed section to the operation and maintenance APP.

[0087] The method of this embodiment is applicable to the chemical and electric power industries with high-precision and high-reliability requirements, such as transporting highly viscous pulverized coal and syrup particles. Through the multi-sensor fusion technology, the misjudgment of a single sensor is excluded, the early warning and accurate classification of jamming are realized, and the risk of unplanned shutdown of equipment is reduced.

[0088] Embodiment 8

[0089] See Figure 4 , this embodiment provides an electronic device, including: one or more processors and a memory. The memory stores one or more programs, and the one or more programs include instructions for executing the method for judging the jamming of the telescopic blanking pipe as described in any one of Embodiments 5-7.

[0090] Such as Figure 4As described above, at the hardware level, the electronic device includes a processor, an internal bus, a network interface, a memory, and a non-volatile memory. Of course, it may also include other hardware required for other services. The processor reads the corresponding computer program from the non-volatile memory into the memory and then runs it to implement the above Figure 3 described method. Of course, in addition to the software implementation, the present invention does not exclude other implementation methods, such as logic devices or a combination of software and hardware. That is to say, the execution subject of the following processing flow is not limited to each logic unit, but can also be hardware or a logic device.

[0091] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of, for example, read-only memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

[0092] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can store information by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory media such as modulated data signals and carrier waves.

[0093] The present invention is applicable to scenarios where telescopic blanking pipes are used to convey viscous materials, such as pulverized coal, ore powder, grains, etc. in the fields of warehousing, chemical industry, electric power, building materials, etc. It is particularly applicable to working conditions that require frequent adjustment of the material stacking height and have relatively high requirements for equipment reliability, effectively ensuring the stable operation of the blanking pipe and production continuity.

[0094] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A device for judging the jamming of a telescopic blanking pipe, characterized in that It includes at least one telescopic connecting blanking pipe, and reflective strips are arranged on the outer walls of each section of the blanking pipe. The reflective strips are used to judge whether materials adhere to the outer wall of the blanking pipe through the reflective effect, and detect the telescopic length of each section of the blanking pipe through scale marks to reflect the jamming condition of the telescopic blanking pipe. Among them, for any section of the blanking pipe, the reflective strip includes a vertical reflective strip arranged along the axial direction of the blanking pipe and at least one transverse reflective strip perpendicular to the vertical reflective strip, constituting the telescopic length of the blanking pipe.

2. The device for judging the jamming of the telescopic blanking pipe according to claim 1, characterized in that, The scale is used to calibrate the telescopic stroke range of each section of the blanking pipe, and judge whether the blanking pipe is extended or contracted in place by observing the exposed length of the scale.

3. The device for judging the jamming of the telescopic blanking pipe according to claim 2, wherein, The reflective strip is a reflective film, reflective paint or reflective patch, and the reflective effect of the reflective strip changes with the thickness of the materials adhering to the outer wall of the blanking pipe.

4. The device for judging the jamming of the telescopic blanking pipe according to claim 1, characterized in that, It includes at least one of the vertical reflective strips, and the reflective strips of adjacent two sections of the blanking pipe are arranged in alignment or stagger to distinguish the telescopic states of different sections.

5. The device for judging the jamming of the telescopic blanking pipe according to claim 1, wherein It further includes a detection device, which is used to collect the reflective image or reflective signal of the reflective strip. The detection device includes a camera, a laser sensor or an infrared sensor.

6. The device for judging the jamming of the telescopic blanking pipe according to claim 5, characterized in that, It further includes a control system, which is electrically connected to the detection device and is used to judge whether the telescopic blanking pipe is jammed according to the change of the reflective effect of the reflective strip and / or the change of the position of the scale mark, and generate a jamming warning signal.

7. The device for judging the jamming of the telescopic blanking pipe according to claim 6, wherein, The control system presets a reflective intensity threshold and / or a scale displacement threshold. When the reflective intensity collected by the detection device is lower than the reflective intensity threshold, and / or the displacement amount of the scale mark is less than the scale displacement threshold, it is determined that the telescopic blanking pipe is jammed.

8. A method for judging the jamming of the telescopic blanking pipe, characterized in that, Based on the device for judging the jamming of the telescopic blanking pipe as described in any one of claims 1-7, the judgment is realized, and the method includes the following steps: Install reflective strips on the outer walls of each section of the blanking pipe, and the reflective strips are provided with scales for calibrating the telescopic stroke; Judge whether materials adhere to the outer wall of the blanking pipe by observing or detecting the reflective effect of the reflective strip; Determine the actual telescopic length of each section of the blanking pipe by observing or detecting the scale mark of the reflective strip, and then judge whether the telescopic blanking pipe is jammed.

9. A method for judging the jamming of the telescopic blanking pipe according to claim 8, characterized in that, The step of judging material adhesion by observing or detecting the reflective effect of the reflective strip includes: Use the detection device to collect the reflective image or reflective signal of the reflective strip; Compare the collected reflective intensity with the preset reflective intensity threshold. If the reflective intensity is lower than the threshold, it is determined that materials adhere to the outer wall of the blanking pipe, which may cause jamming.

10. A method for judging the jamming of the telescopic blanking pipe according to claim 8, characterized in that, The step of determining the telescopic length by the scale mark and judging jamming includes: Record the initial position of the scale of each section of the blanking pipe in the fully extended or contracted state; Detect the current position of the scale mark in real time or periodically, and calculate the displacement amount between the current position and the initial position; If the displacement amount is less than the preset scale displacement threshold, it is determined that the telescopic blanking pipe is jammed.

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