A status detection device for the central telescopic discharge pipe of a coal storage bin

Abstract

This invention relates to a status detection device for a central telescopic discharge pipe in a coal storage bin. Installed between the bin's inlet and the connecting section, the device includes an upper connecting fixed body, a lower connecting sliding body, a spring body, and a detector. The upper connecting fixed body is connected to the lower flange of the bin's inlet, and the lower connecting sliding body is connected to the upper flange of the connecting section. The upper connecting fixed body and the lower connecting sliding body are connected by the spring body. The connecting section is inserted into the first section of the central telescopic discharge pipe and pulls the upper limit stop ring connecting the first section. The detector detects the relative displacement between the upper connecting fixed body and the lower connecting sliding body to determine the current telescopic discharge pipe's extension / retraction state. Compared with existing technologies, this invention can accurately detect the extension / retraction state of the central telescopic discharge pipe in real time without affecting its nested structure, ensuring the stability of the coal storage operation in the bin.

Description

Technical Field

[0001] This invention relates to the field of equipment testing technology in thermal power plants, and in particular to a device for detecting the status of a central telescopic discharge pipe used in coal storage bins. Background Technology

[0002] Euro-type coal storage is the latest environmentally friendly coal storage method. Currently, domestic thermal power plants have introduced Euro-type coal storage technology for coal storage. However, some problems have also arisen when using Euro-type coal storage, which directly affect the safe and stable operation of Euro-type coal storage.

[0003] like Figure 1 As shown, the Euro warehouse contains a number of pieces of equipment. These devices are mainly used to store coal entering the warehouse from low to high and to remove coal from the warehouse from high to low, as well as to output the coal from the warehouse. The Euro warehouse mainly consists of the warehouse cylinder wall 1, the warehouse inlet 2, the warehouse roof trestle 3, the rotary trestle 4, the rotary trestle traveling device 5, the central telescopic discharge pipe 6, the spiral frame lifting wire rope 7, the spiral frame 8, the spiral machine 9, the guide chute dust cover 10, the spiral frame A-frame 11, the central hoisting platform 12, the central rotary platform 13, and the spiral frame central platform 14, etc.

[0004] like Figures 2-4 As shown, the central telescopic discharge pipe 6 of the Euro warehouse is composed of several sections of round tubes of different diameters nested and hooked together. Each section has a fixed length, and the number of round tube sections and the length of each section are determined according to the total telescopic length range. The central telescopic discharge pipe is composed of several round tubes of equal length, identical structure, and different diameters, which are vertically installed on the central axis of the Euro warehouse. From one end of the central telescopic discharge pipe to the other end, that is, from top to bottom, the diameter of each round tube section increases sequentially. Adjacent round tubes can nest and slide with each other. This feature gives the central telescopic discharge pipe the function of extension and retraction. The central telescopic discharge pipe 6 is the coal conveying channel through which coal enters the Euro warehouse from the discharge port on the top of the warehouse and accumulates inside. When there is no coal in the Euro bin, i.e., in an empty state, all the round pipes of the central telescopic discharge pipe 6 extend out without any overlap. However, as coal enters the Euro bin and accumulates, the height of the coal pile increases, causing the central telescopic discharge pipe 6 to shorten continuously. The lower round pipes of the central telescopic discharge pipe 6 begin to contract and overlap until the coal pile reaches its highest level. At this point, the spiral frame 8 and the spiral conveyor 9 rise to their highest positions, and the central telescopic discharge pipe 6 also contracts to a certain length, with most of the round pipes overlapping and nesting together.

[0005] A typical Euro silo consists of 12 sections of circular tubes. Each section comprises an upper limit stop ring 6-2-1, a tube body 6-2-2, and a lower limit stop block 6-2-3. When two adjacent nested sections extend, the upper surface of the lower limit stop block 6-2-3 on the smaller diameter tube can hook onto the lower surface of the upper limit stop ring 6-2-1 on the larger diameter tube, thus achieving the characteristic of moving together after hooking. However, when retracting, they can nest and overlap together. The upper end of the central telescopic discharge pipe 6 is connected to the bottom of the feed inlet on the top of the silo via a flange interface, and the lower end of the central telescopic discharge pipe 6 is connected to the guide chute 10 on the central platform 14 of the spiral frame.

[0006] When coal enters the Euro warehouse, it enters from the upper end of the central telescopic discharge pipe 6 and flows along it to the coal pile inside the warehouse. The upper end of the central telescopic discharge pipe 6 connects to the coal hopper outlet of the conveyor located at the top center of the Euro warehouse, and the lower end connects to the receiving point on the spiral frame 8. Therefore, the central telescopic discharge pipe 6 is the only channel for coal entering the warehouse. During coal stacking, the length of the central telescopic discharge pipe 6 continuously shortens as the spiral frame 8 rises, and during coal removal from the warehouse, the length of the central telescopic discharge pipe 6 continuously extends as the spiral frame 8 descends. The central telescopic discharge pipe 6 has a telescopic function, which can prevent the coal entering the warehouse from scattering and spilling during the descent, and ensure that the falling coal always lands on the receiving point on the spiral frame 8, preventing the coal from directly impacting the coal pile; at the same time, it reduces coal dust and ensures that coal entering and stacking in an orderly and safe manner.

[0007] Because the central telescopic discharge pipe 6 is composed of several concentric nested sections of round pipes of different diameters, each section of round pipe is of the same length. From top to bottom, the diameter of each section of round pipe increases sequentially from the first section to the last section. This allows the previous section of round pipe to be inserted into the next section of round pipe. This sequential insertion continues until all the round pipes are inserted into the last section of round pipe, which is the so-called conveying state. Each section of round pipe has steps of different diameters at both ends as sliding limit connectors, which allow adjacent sections to slide against each other while still being hooked together and unable to be separated. However, they can also slide relative to each other along the central axis of the round pipe. This structure connects several discharge pipe sections on a central axis. As the distance between the two ends lengthens or shortens, the sections expand or contract sequentially. This structural feature allows the distance between the inlet and outlet of the central telescopic discharge pipe to change with the distance between the rotary bridge 4 and the spiral frame 8, ensuring that the material always passes through the central telescopic discharge pipe 6. When the spiral frame 8 is in its highest position, the central telescopic discharge pipe 6 retracts to its shortest distance. Since the central telescopic discharge pipe 6 is vertical, each section of the pipe overlaps the next section under the influence of gravity. As the spiral frame 8 descends, it extends section by section, starting from the topmost section, until the penultimate section is completely extended. At this point, the spiral frame 8 is at the bottom of the bulkhead, and all the coal inside has been emptied. When coal is added to the bulkhead, the spiral frame 8 gradually rises, and the fully extended central telescopic discharge pipe 6 begins to retract. During retraction, the second-to-last section from the bottom is inserted into the last section. When fully inserted, the second-to-last section is stationary relative to the last section. As the spiral frame 8 continues to rise, the third-to-last section begins to insert into the second-to-last section. In this way, as the spiral frame 8 rises, the central telescopic discharge tube 6 retracts into the lower section of the circular tube. When the spiral frame 8 rises to its highest point, the central telescopic discharge tube 6 retracts completely into the lowest section of the circular tube. The extension and retraction of the central telescopic discharge tube 6 are always consistent with the rising and falling motion of the spiral frame 8.

[0008] In current practical applications, lignite is the main type of coal used for power generation in China. This coal has a high proportion of fine particles, high volatile matter and moisture content, and high viscosity. This type of coal is relatively inexpensive, which can effectively reduce power generation costs and improve economic efficiency. Therefore, the use of this type of coal is a trend in the power generation industry. However, when storing this type of coal in Euro warehouses, coal dust and water vapor can easily mix and adhere to the wall of the central telescopic discharge pipe 6. This adhered coal will hinder the stretching or contraction of the central telescopic discharge pipe 6, affect the normal sliding of each section of the pipe, and may even cause multiple sections of the discharge pipe to stick together as a whole. If the central telescopic discharge pipe 6 cannot stretch or shorten synchronously due to adhesion when the spiral frame 8 continues to rise or fall, it will lead to damage to the central telescopic discharge pipe 6, causing the Euro warehouse equipment to malfunction. In addition, the environment inside the Euro warehouse is quite special. The warehouse contains various combustible gases and coal, making the maintenance of the central telescopic discharge pipe 6 extremely difficult. Once damaged, repairs require a lot of manpower and resources, while also consuming a significant amount of Euro warehouse operating time, which seriously affects the normal coal feeding and discharging operations of the Euro warehouse coal storage equipment.

[0009] Because the central telescopic discharge pipe 6 adopts a nested structure, it is difficult to install discharge pipe status detection sensors to detect whether the telescopic movement of each nested circular pipe is normal. The existing Euro silo central telescopic discharge pipe cannot be equipped with a corresponding detection device to avoid damage caused by jamming. In actual Euro silo operation, damage caused by jamming of the central telescopic discharge pipe has occurred in Euro silos both domestically and internationally, which seriously affects the stability of Euro silo coal storage operation. Summary of the Invention

[0010] The purpose of this invention is to overcome the defects of the prior art by providing a central telescopic discharge pipe status detection device for coal storage bins. This device can detect the extension and retraction status of the central telescopic discharge pipe in real time without affecting the nested structure of the central telescopic discharge pipe, thus ensuring the stability of coal storage operation in the bins.

[0011] The objective of this invention can be achieved through the following technical solution: A central telescopic discharge pipe status detection device for a coal storage bin, installed between the bin's inlet and the connecting section, includes an upper connecting fixed body, a lower connecting sliding body, a spring body, and a detector. The upper connecting fixed body is connected to the lower flange of the bin's inlet, and the lower connecting sliding body is connected to the upper flange of the connecting section. The upper connecting fixed body and the lower connecting sliding body are connected by the spring body. The connecting section is inserted into the first section of the central telescopic discharge pipe and drags the upper limit stop ring connected to the first section of the pipe. The detector is used to detect the relative displacement between the upper connecting fixed body and the lower connecting sliding body to determine the current telescopic state of the central telescopic discharge pipe.

[0012] Furthermore, an internal sealing strip is provided between the upper connecting fixed body and the lower connecting sliding body, and an external sealing sleeve is fixedly connected to the outer side of the upper connecting fixed body and the lower connecting sliding body by a hoop. The internal sealing strip and the external sealing sleeve are used to enclose the spring body in a space that is not affected by the environment inside the Eurobox, ensuring that the relative movement between the upper connecting fixed body and the lower connecting sliding body is carried out in a stable environment.

[0013] Furthermore, the upper connecting fixing body includes a connecting ring, an upper connecting flange, a straight section of the discharge pipe, an inclined section of the discharge pipe, and a connecting ring base plate. The upper connecting flange is connected to the lower flange of the feed inlet of the Euro bin by bolts. The connecting ring base plate is used to support the connecting spring body. The inclined section of the discharge pipe is connected to the lower end of the straight section of the discharge pipe, and together they serve as a coal channel. The inclined section of the discharge pipe is used to prevent coal from impacting the internal sealing strip.

[0014] Furthermore, an inspection hole is provided on the wall of the connecting ring, and a spring guide rod guide hole is provided on the bottom plate of the connecting ring.

[0015] Furthermore, the lower connecting sliding body includes an upper bearing surface and a lower connecting flange. A material drop pipe is connected between the upper bearing surface and the lower connecting flange. The upper bearing surface is used to fix and connect the spring body. The lower connecting flange is connected to the connecting section. The material drop pipe is a coal channel.

[0016] Furthermore, the lower part of the lower connecting sliding body is also provided with a sealing ring for pressing and fixing the port of the outer sealing sleeve by a clamp.

[0017] Furthermore, the spring body includes an upper seat plate and a lower seat plate, with multiple springs connected between the upper and lower seat plates. The upper seat plate is fixedly connected to the upper bearing surface of the lower connecting sliding body. A guide screw is provided on the upper seat plate, and a large-diameter cylindrical platform is provided between the guide screw and the upper seat plate for positioning and guiding the spring. A spring guide body is provided on the lower seat plate for positioning and guiding the spring.

[0018] Furthermore, the detector includes an upper fixed frame and a lower movable frame arranged in the same vertical plane. The upper fixed frame is fixed on the upper surface of the connecting ring of the upper connecting fixed body, and the lower movable frame is fixed on the lower plane of the sealing ring. The upper fixed frame is provided with a rotating shaft, and an actuating arm is installed on the rotating shaft. The actuating arm has lever characteristics, and several sensing holes are provided at one end of the actuating arm as sensing elements. A sensor is installed on the upper fixed frame, and the sensing point of the sensor is directly opposite the sensing element. The sensor is connected to the Eurowarehouse control system. When the sensor is close to these sensing elements, it triggers the generation of an electrical signal, which is transmitted to the Eurowarehouse control system to reflect the current extension and retraction state of the central telescopic discharge pipe.

[0019] Furthermore, the connecting pin of the actuator arm is connected to the lower movable frame through a connecting rod, so that the relative displacement between the upper connecting fixed body and the lower connecting sliding body is converted into the rotation angle of the actuator arm, and the movement of the sensing body can be detected by the sensor.

[0020] Furthermore, the sensor is specifically a non-contact proximity limiter.

[0021] Compared with the prior art, the present invention has the following advantages:

[0022] This invention relates to a detection device installed between the feed inlet of the Euro warehouse and the connecting section. In this detection device, the upper connecting fixed body and the lower connecting sliding body are connected by a spring body, which has the characteristic of changing the distance under the action of external force. The upper connecting fixed body is fixedly connected to the feed inlet of the Euro warehouse, while the lower connecting sliding body is connected to the connecting section 25. The connecting section is inserted into the central telescopic discharge tube, and the uppermost section of the central telescopic discharge tube, namely the first section of the round tube, is dragged by the connecting section. During the extension and retraction of the central telescopic discharge tube, the weight of the extended portion of the tube is transmitted upwards to the feed inlet of the Euro warehouse. With the addition of a detection device, this weight acts on the spring body through the lower connecting sliding body, causing compression of the spring body and shortening the axial distance between the upper connecting fixed body and the lower connecting sliding body. The extension length of the central telescopic discharge tube is proportional to the compression of the spring body, i.e., proportional to the axial distance between the upper connecting fixed body and the lower connecting sliding body. Using a detector on the detection device, the change in the axial distance between the upper connecting fixed body and the lower connecting sliding body can be reflected in real time, thus detecting the current extension and retraction state of the central telescopic discharge tube. This invention does not require altering the original structure of the Euro warehouse equipment. It fully utilizes and matches the characteristics of the equipment structure within the Euro warehouse, enabling monitoring of the extension and retraction of the central telescopic discharge tube, timely detection of abnormalities, and prevention of various damages caused by jamming, effectively improving the operational stability and reliability of the central telescopic discharge tube.

[0023] This invention features an internal sealing strip between the upper connecting fixed body and the lower connecting sliding body, and an external sealing sleeve is fixedly connected to the outside of the upper connecting fixed body and the lower connecting sliding body via a hoop. The internal sealing strip connects the coal falling pipe between the upper connecting fixed body and the lower connecting sliding body, preventing falling coal dust from escaping from the joint. Through the internal sealing strip and the external sealing sleeve, the various components of the spring body can be enclosed in a space unaffected by the environment inside the Eurobox. The relative movement between the upper connecting fixed body and the lower connecting sliding body also takes place entirely in a closed and stable environment, ensuring the operational reliability of this detection device.

[0024] The present invention designs a tubular straight section of the material drop pipe and a connected inclined section of the material drop pipe in the upper connecting and fixing body. The inclined section of the material drop pipe has a conical feature and its diameter is smaller than that of the straight section of the material drop pipe, thereby preventing coal from impacting the internal sealing strip during the falling process. In addition, a certain number of inspection holes are opened on the outer cylindrical surface of the upper connecting and fixing body to further facilitate the needs of later maintenance and inspection.

[0025] In this invention, a rotating shaft is provided on the upper fixed frame of the detector, and an actuating arm is mounted on the rotating shaft. The actuating arm has lever characteristics and several sensing holes at one end of the actuating arm as sensors. A sensor is mounted on the upper fixed frame, and the sensing point of the sensor is directly opposite the sensors. When the sensor approaches these sensors, it can trigger the generation of an electrical signal and transmit it to the Eurocang control system. The actuating arm rotates around the rotating shaft within a certain angle range. The distances from the two ends of the actuating arm to the rotating shaft are unequal. If the distance from the sensors to the rotating shaft is designed to be several times the distance from the connecting pin to the rotating shaft, then the distance the sensors move is several times the relative displacement between the upper connecting fixed body and the lower connecting sliding body. This enables more accurate detection feedback. The connecting pin of the actuating arm is connected to the lower moving frame through a connecting rod. In this way, the relative displacement between the upper connecting fixed body and the lower connecting sliding body can be converted into the rotation angle of the actuating arm, so that the movement of the sensors can be detected by the sensors in a timely and accurate manner. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of the Euro warehouse;

[0027] Figure 2 A schematic diagram of the cross-sectional structure of the central telescopic discharge pipe;

[0028] Figure 3 This is a schematic diagram of a single-section circular tube;

[0029] Figure 4 This is a schematic diagram of the cross-sectional structure of the connection between the circular tubes;

[0030] Figure 5 This is a schematic diagram illustrating the installation effect of the present invention;

[0031] Figure 6 This is a schematic diagram showing the connection between the existing Euro warehouse inlet and the connecting section;

[0032] Figure 7 This is a structural diagram of the connecting section;

[0033] Figure 8 This is a schematic diagram of the structure of the present invention;

[0034] Figure 9 This is a schematic diagram of the upper connecting and fixing body in this invention;

[0035] Figure 10This is a schematic diagram of the lower connecting sliding body in this invention;

[0036] Figure 11 This is a schematic diagram of the spring body in this invention;

[0037] Figure 12 This is a schematic diagram of the upper spring seat in this invention;

[0038] Figure 13 This is a schematic diagram of the lower spring seat in this invention;

[0039] Figure 14 This is a schematic diagram of the detector structure in this invention;

[0040] Explanation of markings in the diagram:

[0041] Figure 1 The components are: 1. Euro silo cylinder wall, 2. Euro silo feed inlet, 3. Euro silo top trestle, 4. Rotary trestle, 5. Rotary trestle traveling device, 6. Central telescopic discharge pipe, 7. Spiral frame lifting wire rope, 8. Spiral frame, 9. Spiral conveyor, 10. Guide chute dust cover, 11. Spiral frame A-frame, 12. Central winch platform, 13. Central rotary platform, 14. Spiral frame central platform.

[0042] Figure 2 In the middle: 6-1, the first section of the round pipe; 6-1-1, the foot of the first section of the round pipe; 6-2, the second section of the round pipe; 6-3, the third section of the round pipe; 6-4, the fourth section of the round pipe; 6-5, the fifth section of the round pipe;

[0043] Figure 3 In the middle: 6-2-1, upper limit stop ring; 6-2-2, round tube body; 6-2-3, lower limit stop block;

[0044] Figure 4 In the middle: 6-2-1, upper limit stop ring; 6-2-2, round tube body; 6-2-4, connecting bolt; 6-3-2, round tube body; 6-3-3, lower limit stop block;

[0045] Figure 5 In the middle: 16-2, the first section of the central telescopic discharge pipe; 15-3, the lower connecting flange; 23, the detector; 25, the connecting section.

[0046] Figure 6 Middle: 2. Euro warehouse inlet, 25. Connecting section;

[0047] Figure 7 Middle: 25-1, round tube body; 25-2, upper connecting flange; 25-3, lower limit stop block;

[0048] Figure 8In the middle: 15-1, sealing bolt, 15-3, lower connecting flange, 15-5, material drop pipe, 16-2, upper connecting flange, 16-3, straight section of material drop pipe, 16-4, inclined section of material drop pipe, 17-2, spring, 17-4, nut, 18, clamp, 19, outer sealing sleeve, 20, inner sealing strip, 21, sealing plate, 22, fixing bolt;

[0049] Figure 9 In the middle: 16-1, connecting ring; 16-2, upper connecting flange; 16-3, straight section of the discharge pipe; 16-4, inclined section of the discharge pipe; 16-5, bottom plate of the connecting ring; 16-6, guide hole of the spring guide rod; 16-7, inspection hole.

[0050] Figure 10 In the middle: 15-1, sealing bolt, 15-2, upper bearing surface, 15-3, lower connecting flange, 15-4, fixing screw hole, 15-5, material drop pipe, 15-6, sealing ring;

[0051] Figure 11 In the middle: 17-1, upper seat plate; 17-2, spring; 17-3, lower seat plate; 17-4, nut; 17-5, guide screw;

[0052] Figure 12 Middle: 17-1, upper seat plate; 17-4, nut; 17-5, guide screw; 17-6, fixing screw hole;

[0053] Figure 13 Middle: 17-3, lower seat plate; 17-7, spring guide; 17-8, guide hole;

[0054] Figure 14 In the middle: 15-3, lower connecting flange; 16-1, connecting ring; 16-2, upper connecting flange; 19, external sealing sleeve; 23-1, sensor mounting bracket; 23-2, rotating shaft; 23-3, actuator arm; 23-4, connecting pin; 23-5, upper fixed bracket; 23-6, sensor; 23-7, connecting rod; 23-8, lower movable bracket; 24, sensor. Detailed Implementation

[0055] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0056] Example

[0057] To facilitate understanding of this plan, the existing Eurocoal storage structure and operating principle are explained below: Figures 1-4As shown, when the spiral frame of the Euro warehouse rises or falls according to operational needs, the central telescopic drop pipe 6 needs to extend or shorten, ensuring that there is always a drop pipe connection between the central hoisting platform 12 and the central platform 14 of the spiral frame. This allows coal entering the Euro warehouse to continuously fall within the drop pipe. The extension and shortening of the central telescopic drop pipe 6 is achieved by connecting several sections of circular pipes of different diameters that can slide against each other. The diameters of these connected circular pipes increase sequentially from small to large, with the upper section having a smaller diameter than the lower section. Adjacent sections have a certain distance between their diameters, ensuring that the smaller diameter section can be inserted into the adjacent larger diameter section. Because each section of the central telescopic drop pipe 6 can be inserted into the adjacent larger diameter section, this characteristic results in the smallest diameter at the top and the largest diameter at the bottom of the central telescopic drop pipe 6. Therefore, the entire central telescopic drop pipe 6 possesses... It has the function of elongation and shortening movement. At the same time, an upper limit stop ring 6-2-1 and a lower limit stop block 6-2-3 are set on each section of the circular tube. When the upper end of the circular tube with the smallest diameter of the central telescopic dropping tube 6 is connected to the feed port on the central rotating platform 13 of the Euro warehouse, the lower end of the circular tube with the largest diameter of the central telescopic dropping tube 6, namely the first circular tube 6-1, is connected to the central platform 14 of the spiral frame. It is fixedly connected to the central platform 14 of the spiral frame through the foot 6-1-1 of the first circular tube. The center of the circular tube is aligned with the coal dropping hole set in the center of the central platform 14 of the spiral frame, and the central telescopic dropping tube is always in a vertical state.

[0058] Taking the second section of the circular tube 6-2 as an example, the upper limit stop ring 6-2-1 and the lower limit stop block 6-2-3 are used. When the third section of the circular tube 6-3 extends out of the second section of the circular tube 6-2, when it extends to the maximum distance, the lower limit stop block 6-3-3 of the third section of the circular tube 6-3 is blocked by the upper limit stop ring 6-2-1 of the second section of the circular tube 6-2, causing the third section of the circular tube 6-3 to drag the second section of the circular tube 6-2 upward. Similarly, as the central platform 14 of the spiral frame descends, the central telescopic discharge tube extends. Between two adjacent sections of the circular tube, the upper section of the circular tube will drive the upper limit stop of the lower section of the circular tube to move upward through the lower limit stop, thus achieving the extended state. As the central telescopic discharge tube continues to extend, the upper section of the circular tube drives the lower section of the circular tube, unfolding section by section until all the circular tubes are fully extended. When the central platform 14 of the spiral frame rises, the central telescopic discharge tube 6 needs to continuously retract. From bottom to top, between two adjacent sections of the circular tube, the smaller diameter circular tube gradually inserts into the larger diameter circular tube until the upper limit stop ring of the smaller diameter circular tube touches the upper limit stop ring of the next section. Then the upper section of the circular tube begins to insert into the next section of the circular tube. In this way, adjacent circular tubes are inserted and nested in sequence, and the upper limit stop rings are stacked one after another, so that the central telescopic discharge tube 6 achieves the retracted state.

[0059] The extension and retraction of the central telescopic discharge tube 6 are achieved through the relative movement between the circular tubes. Under the influence of gravity, under normal circumstances, regardless of whether the central telescopic discharge tube extends or retracts, the relative displacement between the circular tubes always occurs between the first and second sections from the bottom up. Moreover, the extended circular tube always starts from the section with the smallest diameter, while the remaining circular tubes continuously move downwards. Subsequently, as the central platform 14 of the spiral frame continues to descend, the smaller diameter circular tubes drag the adjacent larger diameter circular tubes, extending sequentially section by section, until the largest extendable circular tube is fully extended from the first circular tube 6-1. When the central platform 14 rises, the central telescopic drop tube begins to retract. During retraction, it always starts by inserting the first section of the circular tube 6-1, which has the largest possible diameter, and then inserts each section one by one, starting with the largest diameter, until the smallest possible diameter section of the circular tube is fully retracted. After a section of the circular tube has extended from its adjacent section, if the central telescopic drop tube extends again, the section of the circular tube that is being pulled along will be stationary relative to the adjacent section. Conversely, if the central telescopic drop tube retracts, once a section of the circular tube has been inserted into the adjacent section, that section will be stationary.

[0060] The existing Euro warehouse central telescopic discharge tube has 13 sections. Except for the first section, the remaining 12 sections can be extended or retracted. For the sake of simplicity, this embodiment only shows 5 sections of the circular tube for illustration.

[0061] The following is an analysis of the motion of the circular tube:

[0062] When the central platform 14 of the spiral frame descends, and the central telescopic discharge pipe 6 extends to a certain distance, when it is the turn of the fourth section of the circular pipe to extend, the drag force of the fourth section of the circular pipe 6-4 on the lower limit stop of the fifth section of the circular pipe 6-5 can no longer continue to descend with the central platform 14 of the spiral frame. Thus, the circular pipe 6-3 will continue to descend under the action of gravity, thereby extending the fourth section of the circular pipe from the third section of the circular pipe 6-3, the second section of the circular pipe 6-2, and the first section of the circular pipe 6-1.

[0063] a. The third and second round tubes move downwards along with the first round tube and the central platform 14 of the spiral frame, and the fourth round tube 6-4 extends out.

[0064] b. During the extension of the fourth section of the round tube 6-4, no other round tubes (the third section of the round tube and the second section of the round tube) are dragged out by the obstruction between the round tubes.

[0065] c. The next section of the tube can only be dragged after the tube has extended to the correct position.

[0066] When the central platform 14 of the spiral frame rises, the central telescopic discharge pipe 6 retracts. The state is as follows when the third section of the circular pipe is inserted into the second section of the circular pipe 6-2, which rises along with the central platform 14 of the spiral frame:

[0067] a. The third section of the round tube is inserted into the second section of the round tube 6-2 below;

[0068] b. No other round tubes were inserted prematurely during the insertion process;

[0069] c. Once the circular tube is inserted into place, it is stationary relative to the second circular tube 6-2 and the first circular tube, as well as the central platform 14 of the spiral frame. At this point, it is the turn of the next circular tube (the fourth circular tube) to be inserted.

[0070] Based on the elongation and contraction characteristics of the central telescopic discharge pipe 6 in the Euro warehouse, as a coal conveying channel, water vapor and coal dust generated during coal transportation inevitably adhere to the inner wall of the pipe. Even when several sections of the circular pipe are overlapped in the contracted state, a large number of small coal particles will still adhere to the inner wall of the circular pipe through the gaps between the pipes. The amount of coal adhering will increase over time. When the coal accumulates to a certain amount, it will fill the space between these nested pipe walls, causing the entire or part of the central telescopic discharge pipe 6 to stick together as a whole, making it impossible for them to slide relative to each other, thus rendering the telescopic action ineffective. This situation is quite common in actual coal conveying operations. Furthermore, given the existing structural characteristics and the lack of corresponding detection methods, when the central telescopic discharge pipe 6 experiences this situation and cannot be detected, it will inevitably be damaged during the upward or downward movement of the central platform 14 of the spiral frame, resulting in various situations such as detachment or extrusion deformation. Due to the special environment inside the Euro warehouse, the maintenance cost and time are high, and these factors have a significant impact on the normal operation of the Euro warehouse. Moreover, with the increase in the characteristics of coal, such as moisture, viscosity, and particle size, the frequency of such failures will increase. Therefore, it is necessary to effectively detect the jamming situation of the central telescopic discharge pipe 6 in order to clean it in time and avoid damage.

[0071] To address this, this solution proposes a detection device for the central telescopic discharge pipe of a coal storage bin. This device detects the telescopic and sliding state of the central telescopic discharge pipe 6 in the bin. When the telescopic state is abnormal, it can promptly transmit a signal to the equipment control system, which will then stop operation. Once the problem is resolved and the system returns to normal, operation can resume. This avoids serious consequences caused by failing to detect abnormal telescopic and sliding states of the central telescopic discharge pipe 6, ensuring the normal coal storage operation of the bin.

[0072] like Figure 5 As shown in the diagram, this solution installs the detection device between the Eurobox inlet 2 and the connecting section 25. In the prior art, the connection between the Eurobox inlet 2 and the connecting section 25 is shown in the diagram below. Figure 6 As shown, the structure of the connecting segment 25 is as follows: Figure 7As shown, the upper end is provided with an upper connecting flange 25-2 and the lower end is provided with a lower limit stop 25-3. In this scheme, the upper connecting flange 16-2 of the detection device is bolted to the lower flange of the feed port 2 of the Euro warehouse, and the lower connecting flange 15-3 of the detection device is connected to the upper flange of the connecting section 25.

[0073] like Figure 8 As shown, the detection device mainly consists of an upper connecting and fixing body 16, a lower connecting sliding body 15, a spring body 17, an internal sealing strip 20, an external sealing sleeve 19, and a detector 23. The upper connecting and fixing body 16 comprises a connecting ring 16-1, an upper connecting flange 16-2, a straight section of the discharge pipe 16-3, an inclined section of the discharge pipe 16-4, a connecting ring base plate 16-5, a spring guide rod guide hole 16-6, and an inspection hole 16-7.

[0074] The lower connecting sliding body 15 is composed of components such as sealing bolts 15-1, upper bearing surface 15-2, lower connecting flange 15-3, fixing screw holes 15-4, material drop pipe 15-5, and sealing ring 15-6.

[0075] The spring body 17 is composed of components such as upper seat plate 17-1, spring 17-2, lower seat plate 17-3, nut 17-4, guide screw 17-5, fixing screw hole 17-6, lower seat plate 17-3, spring guide body 17-7, and guide hole 17-8.

[0076] The inner sealing strip 20 and the outer sealing sleeve 19 are made of flexible flame-retardant material to achieve a sealing effect;

[0077] The detector 23 consists of a sensor mounting bracket 23-1, a rotating shaft 23-2, an actuator arm 23-3, a connecting pin 23-4, an upper fixed bracket 23-5, a sensor 23-6, a connecting rod 23-7, a lower movable bracket 23-8, and a sensor 24.

[0078] The upper connecting fixing body 16 and the lower connecting sliding body 15 are connected together by a spring body 17. The upper connecting flange 16-2 of the upper connecting fixing body 16 is bolted to the lower flange of the Eurobox inlet 2. The lower connecting flange 15-3 of the lower connecting sliding body 15 is bolted to the upper connecting flange 25-2 of the connecting section 25. The connecting section 25 is inserted into the uppermost section of the central telescopic discharge pipe 6, i.e., the section with the smallest diameter, and is pulled and connected to the upper end of the central telescopic discharge pipe 6 by the lower limit stop 25-3.

[0079] like Figure 9As shown, the upper connecting and fixing body 16 has a tubular straight section 16-3 in the middle, which serves as a channel for coal. The inclined section 16-4 of the material drop pipe has a tapered shape and its diameter is smaller than that of the straight section 16-3, which is to prevent coal from impacting the internal sealing strip 20. The lower end of the upper connecting and fixing body 16 is provided with a connecting ring base plate 16-5 to support the spring body 17. Four spring guide rod guide holes 16-6 are provided on the base plate to fix the spring body 17. A certain number of inspection holes 16-7 are provided on the outer cylindrical surface of the upper connecting and fixing body 16 to meet the needs of maintenance and inspection.

[0080] like Figure 10 As shown, the upper bearing surface 15-2 of the lower connecting sliding body 15 has a certain number of holes, namely fixing bolt holes 15-4, for fixing the upper seat plate of the spring body 17 to the upper bearing surface 15-2 of the lower connecting sliding body 15 securely with bolts. A certain number of screws are provided on the upper bearing surface 15-2 to cooperate with the sealing pressure plate to fix the internal sealing strip 20. A sealing fixing ring 15-6 is provided at the lower part of the lower connecting sliding body 15 for pressing and fixing the port of the external sealing sleeve through the clamp 18. A lower connecting flange 15-3 is provided at the bottom port of the lower connecting sliding body 15 for connecting the connecting section 25. The central round pipe is the material discharge pipe 15-5, which is the channel for coal to enter the storage bin.

[0081] like Figures 11-13 As shown, the spring body 17 is a ring-shaped elastic component consisting of several springs 17-2 fixed together by an upper base plate 17-1 and a lower base plate 17-3. Several screw holes are formed on the upper surface of the upper base plate 17-1, corresponding to the fixing screw holes on the upper bearing surface 15-2 of the lower connecting sliding body 15, to fix the upper base plate 17-1 of the spring body 17 to the upper bearing surface 15-2 of the lower connecting sliding body 15. A guide screw 17-5 is provided on the upper base plate, and a large-diameter cylindrical platform is provided between the guide screw 17-5 and the upper base plate 17-1 for spring positioning and guidance. The lower base plate 17-3 has spring guide bodies 17-7, the same number as the springs and with the same diameter as the large-diameter cylindrical platform on the upper base plate 17-1, for spring positioning and guidance. A guide hole 17-8 is provided in the middle of the spring guide body 17-7 for inserting the guide screw 17-5, which is then fixed by a nut 17-4. The spacing between the upper seat plate 17-1 and the lower seat plate 17-3 of the ring spring body 17 formed in this way will change with the force applied between the two plates as external forces change.

[0082] When the upper connecting fixed body 16, the lower connecting sliding body 15, and the spring body 17 are assembled together, the upper connecting fixed body 16 and the lower connecting sliding body 15 can undergo relative displacement along the central axis as the external force changes. An internal sealing strip 20 is installed near the coal feeding pipe to connect the coal feeding pipe between the upper connecting fixed body 16 and the lower connecting sliding body 15, preventing coal dust from escaping through the joint. There will always be a certain concentration of coal dust in the air inside the Eurobin. A certain number of inspection holes 16-7 are provided on the outer cylindrical surface of the upper connecting fixed body 16. If this dust enters the moving mechanism through the inspection holes 16-7, it will inevitably adhere to the surface of various parts, causing jamming. Therefore, an external sealing sleeve 19 is provided. The two ends of the sealing sleeve 19 are fixed to the outer cylindrical surface of the upper connecting fixed body 16 and the lower connecting sliding body 15 by clamps 18. Through these two seals, the components of the spring body 17 can be sealed in a space unaffected by the environment inside the Eurobin. The relative movement between the upper connecting fixed body 16 and the lower connecting sliding body 15 is carried out in a completely closed and stable environment, ensuring the reliability of the detection device.

[0083] like Figure 14As shown, detector 23 is used to detect the relative displacement between the upper connecting fixed body 16 and the lower connecting sliding body 15. The upper fixed frame 23-5 of detector 23 is fixed on the upper surface of the connecting ring 16-1 of the upper connecting fixed body 16, and the lower moving frame 23-8 of detection device 23 is fixed on the lower plane of the sealing ring 15-6. The upper fixed frame 23-5 and the lower moving frame 23-8 are arranged on the same vertical plane. A rotating shaft 23-2 is provided on the upper fixed frame 23-5, and an actuating arm 23-3 is installed on the rotating shaft. The actuating arm 23-3 has lever characteristics. Several sensing holes are provided at one end of the actuating arm 23-3 as sensors 23-6. A sensor mounting bracket 23-1 is installed on the upper fixed frame 23-5 for installing sensor 24. The sensing point of sensor 24 is directly facing the several sensors 23-6. When sensor 24 is close to these sensors, it can detect the relative displacement between the sensors 24 and the moving parts. The system can trigger the generation of an electrical signal, which is transmitted to the Euro warehouse control system to reflect the extension and retraction state of the central telescopic discharge pipe 6. The actuator 23-3 rotates around the rotating shaft 23-2 within a certain angle range. The distances from the two ends of the actuator 23-3 to the rotating shaft are not equal. If the distance from the sensor 23-6 to the rotating shaft 23-2 is designed to be several times the distance between the connecting pin 23-4 and the rotating shaft 23-2, then the distance moved by the sensor 23-6 is several times the relative displacement between the upper connecting fixed body 16 and the lower connecting sliding body 15. This can achieve more accurate detection feedback. The connecting pin of the actuator 23-3 is connected to the lower moving frame 23-8 through the connecting rod 23-7. In this way, the relative displacement between the upper connecting fixed body 16 and the lower connecting sliding body 15 can be converted into the rotation angle of the actuator 23-3, and the movement of the sensor 23-6 can be sensed by the sensor 24.

[0084] In practical applications, sensor 24 can be various types of non-contact proximity limiters. The hysteresis, response time, detection frequency, and repeatability of the proximity limiter can meet the requirements of the control system. The type of proximity limiter selected is matched with the material and surface color of the sensor 23-6 so that the electrical signal output by sensor 24 can meet the input requirements of the Eurocang control system.

[0085] The main purpose of detector 23 is to convert the relative displacement between the upper connecting fixed body 16 and the lower connecting sliding body 15 into the motion of the sensing body 23-6 so that it can be detected by sensor 24. Alternatively, an electronic gyroscope can be directly mounted on the lower connecting sliding body 15 to detect the motion state of the lower connecting sliding body 15.

[0086] This solution proposes installing the detection device between the feed inlet 2 and the connecting section 25 of the Eurobin. The central telescopic discharge pipe 6 is the coal entry channel of the Eurobin. As the coal falls through the central telescopic discharge pipe 6, dust is inevitably generated. This coal dust will adhere to the pipe wall of the central telescopic discharge pipe 6. There will also be a large amount of dust in the environment inside the Eurobin outside the central telescopic discharge pipe 6. This coal dust will also accumulate at the joints between any sections of the central telescopic discharge pipe 6. As the Eurobin operates for longer, more and more coal will accumulate and adhere inside and outside the central telescopic discharge pipe 6, inevitably causing sticking and jamming of the telescopic movement of the central telescopic discharge pipe 6. If the coal is highly viscous, several sections of the pipe will stick together as a whole, losing the ability to slide relative to each other. In severe cases, the entire central telescopic discharge pipe 6 will stick together as a whole and will not be able to telescopically move. When the central platform 14 of the spiral frame moves up and down, it will inevitably damage the central telescopic discharge pipe 6.

[0087] When the coal pile height in the Euro warehouse is at its lowest point, the central platform of the spiral frame is at its lowest position. The central telescopic discharge pipe 6 extends to its maximum length. Each section of the circular pipe is hooked and dragged together, causing the total discharge pipe to extend. Since each section of the circular pipe has a fixed weight, when the central telescopic discharge pipe 6 extends, the weight of each extended section of the circular pipe is transferred to the previous section through the hooks, and then transferred upwards section by section, eventually reaching the Euro warehouse inlet 2. When the central telescopic discharge pipe 6 is at its maximum length, the weight of all the extended pipes will eventually be transferred to the Euro warehouse inlet 2. When the coal pile in the Euro warehouse reaches its highest height, the length of the central telescopic discharge pipe 6 also shrinks to its shortest point. At this time, the weight of the circular pipes that can be transferred to the Euro warehouse inlet 2 is minimal, and the weight of the circular pipes that have shrunk and overlapped together is transferred to the lower spiral frame central platform 14. In other words, only the weight of the circular pipe that is dragged upwards will be transferred to the Euro warehouse inlet 2. Based on the characteristic of the telescopic discharge pipe 6's telescopic movement, it can be known that when the Euro bin starts to accumulate material from the bottom of the bin until it is full, the central telescopic discharge pipe 6 shrinks from its longest length to its shortest length. The weight of the central telescopic discharge pipe 6 acting on the Euro bin inlet 2 decreases as its length shortens, and vice versa.

[0088] Because the upper connecting fixed body 16 and the lower connecting sliding body 15 of the detection device in this scheme have the characteristic of changing the distance under the action of external force through the spring body 17, the upper connecting fixed body 16 is connected and fixed to the Eurobox inlet 2 through the flange interface, while the lower flange of the lower connecting sliding body 15 is connected to the upper connecting flange 25-2 of the connecting section 25. Then, the connecting section 25 is inserted into the central telescopic dropping pipe 6, and the upper limit stop ring of the uppermost section of the central telescopic dropping pipe 6 is dragged by the lower limit stop block 25-3 of the connecting section 25 to connect with the upper end of the central telescopic dropping pipe 6. During the telescopic movement of the central telescopic discharge tube 6, the weight of the extended portion of the tube is transmitted upwards to the feed inlet 2 of the Eurobox. With the addition of the detection device, this weight acts on the spring body 17 via the lower connecting sliding body 15, causing compression of the spring body 17 and shortening the axial distance between the upper connecting fixed body 16 and the lower connecting sliding body 15. The extended length of the central telescopic discharge tube 6 is proportional to the compression of the spring body 17 and the axial distance between the upper connecting fixed body 16 and the lower connecting sliding body 15. The detector 23 on the detection device can then reflect the change in the axial distance between the upper connecting fixed body 16 and the lower connecting sliding body 15 in real time. Furthermore, the lever characteristic of the amplifying arm 23-3 amplifies the stroke, with the amplification factor determined by the type and accuracy level of the selected sensor.

[0089] When the central platform 14 of the spiral frame of the Euro warehouse is at its lowest position at the bottom of the warehouse, the extended length of the central telescopic discharge pipe 6 is the longest. At this time, the weight of the extended round pipe acts on the detection device, the compression of the spring body 17 is the largest, and the axial distance between the upper connecting fixed body 16 and the lower connecting sliding body 15 is also the largest. When the central platform 14 of the spiral frame of the Euro warehouse is at its highest position inside the warehouse, the extended length of the central telescopic discharge pipe 6 is the shortest. At this time, the weight of the extended round pipe acts on the detection device, the compression of the spring body 17 is the smallest, and the axial distance between the upper connecting fixed body 16 and the lower connecting sliding body 15 is also the smallest. These changes in spacing correspond one-to-one with the serial numbers of the extended circular tubes. When several sections of the central telescopic discharge tube 6 are stuck together due to coal adhesion, these sections will be pulled out simultaneously during extension. The weight of the tube acting on the spring body 17 will no longer be the weight of a single section, resulting in a compression greater than normal. This confirms an abnormality. Normally, the weight of each section of the central telescopic discharge tube 6 should decrease as it contracts. However, if several sections are stuck together, their weight will decrease simultaneously, clearly indicating an abnormality. If the entire central telescopic discharge tube 6 is stuck together, the weight of the extended circular tubes will decrease simultaneously during contraction. The detector 23 on the detection device will immediately detect this and provide feedback through the sensor 24. The control system can then immediately identify the abnormality by comparing the displacement generated by the detection device with the normal displacement, and determine the nature of the abnormality based on the difference. In addition, the axial distance between the upper connecting fixed body 16 and the lower connecting sliding body 15 is always present, and its state is expressed by the deformation of the spring body 17. In this way, even if the central telescopic discharge tube 6 sticks and the telescopic function fails, when the central platform 14 of the spiral frame moves up and down, it will only cause the axial distance between the connecting fixed body 16 and the lower connecting sliding body 15 of the detection device to change. However, this process will not cause damage to the central telescopic discharge tube 6, thus protecting the central telescopic discharge tube 6. The detection device is also equipped with special seals inside and outside to keep the relatively moving parts inside in a good environment, ensuring normal, reliable and long-term operation.

[0090] It is evident that this detection device can not only promptly provide feedback on whether the extension and retraction status of the central telescopic discharge pipe 6 is normal, but also protect the central telescopic discharge pipe 6, ensuring that it is always in a sealed environment and that its operation is reliable.

[0091] In summary, this solution offers advantages such as simple structure, reliable equipment, no need to alter the existing equipment structure of the Eurowarehouse, full utilization and compatibility with the warehouse's internal equipment structure, minimal space occupation, and minimal impact on daily inspection and maintenance. Furthermore, it is easy to implement; once the equipment is adjusted and installed, maintenance is minimal, and it can operate continuously and stably for extended periods.

[0092] When storing coal with small particle size, high dust content, and high moisture content, the surface of the central telescopic feed pipe in the Euro warehouse is prone to the adhesion of a large number of small coal particles. This can cause jamming when the central telescopic feed pipe extends or contracts. In addition, various other reasons can also cause jamming of the central telescopic feed pipe. Once jamming occurs, the abnormal operation of the central telescopic feed pipe will lead to damage. The detection device proposed in this solution can monitor the extension and retraction of the central telescopic feed pipe, detect abnormalities in a timely manner, and prevent damage to the central telescopic feed pipe caused by jamming, effectively improving the operational stability and reliability of the central telescopic feed pipe.

[0093] The central telescopic chutes are a crucial coal conveying channel within the Eurobin silo. Any obstruction will directly impact the normal operation of coal storage in the silo. Currently, the central chutes in the Eurobin lack corresponding protection and detection devices, meaning that obstruction during telescopic movement will inevitably cause equipment damage. The detection device proposed in this solution can directly detect various obstructions in the central telescopic chutes of the Eurobin, preventing damage, reducing the frequency and duration of downtime for maintenance and repair, lowering maintenance costs, and improving the Eurobin's adaptability to storing various types of coal.

Claims

1. A device for detecting the status of a central telescopic discharge pipe in a coal storage bin, characterized in that, Installed between the feed inlet (2) of the Euro warehouse and the connecting section (25), it includes an upper connecting fixing body (16), a lower connecting sliding body (15), a spring body (17) and a detector (23). The upper connecting fixing body (16) is connected to the lower flange of the feed inlet (2) of the Euro warehouse, and the lower connecting sliding body (15) is connected to the upper flange of the connecting section (25). The upper connecting fixing body (16) and the lower connecting sliding body (15) are connected by the spring body (17). The connecting section (25) is inserted into the first section of the central telescopic discharge pipe (6) and drags the upper limit stop ring of the first section of the pipe. The detector (23) is used to detect the relative displacement between the upper connecting fixing body (16) and the lower connecting sliding body (15) to determine the current telescopic state of the central telescopic discharge pipe (6). An internal sealing strip (20) is provided between the upper connecting fixed body (16) and the lower connecting sliding body (15). An external sealing sleeve (19) is fixedly connected to the outer side of the upper connecting fixed body (16) and the lower connecting sliding body (15) by a hoop (18). The internal sealing strip (20) and the external sealing sleeve (19) are used to enclose the spring body (17) in a space that is not affected by the environment inside the Eurobox, ensuring that the relative movement between the upper connecting fixed body (16) and the lower connecting sliding body (15) is carried out in a stable environment. The upper connecting fixing body (16) includes a connecting ring, an upper connecting flange, a straight section of the discharge pipe, an inclined section of the discharge pipe, and a connecting ring base plate. The upper connecting flange is connected to the lower flange of the Eurobox inlet (2) by bolts. The connecting ring base plate is used to support the connecting spring body (17). The inclined section of the discharge pipe is connected to the lower end of the straight section of the discharge pipe, and together they serve as a coal channel. The inclined section of the discharge pipe is used to prevent coal from impacting the internal sealing strip (20). The lower connecting sliding body (15) includes an upper bearing surface and a lower connecting flange. A material drop pipe is connected between the upper bearing surface and the lower connecting flange. The upper bearing surface is used to fix the connecting spring body (17). The lower connecting flange is connected to the connecting section (25). The material drop pipe is a coal channel. The spring body (17) includes an upper seat plate and a lower seat plate, and multiple springs are connected between the upper seat plate and the lower seat plate. The upper seat plate is fixedly connected to the upper bearing surface of the lower connecting sliding body (15).

2. The device for detecting the status of a central telescopic discharge pipe for a coal storage bin according to claim 1, characterized in that, The connecting ring has an inspection hole on its wall and a spring guide hole on its bottom plate.

3. The device for detecting the status of a central telescopic discharge pipe for a coal storage bin according to claim 1, characterized in that, The lower part of the lower connecting sliding body (15) is also provided with a sealing ring for pressing and fixing the port of the outer sealing sleeve (19) through the hoop (18).

4. The device for detecting the status of a central telescopic discharge pipe for a coal storage bin according to claim 1, characterized in that, The upper base plate is provided with a guide screw, and a large-diameter cylindrical platform is provided between the guide screw and the upper base plate for positioning and guiding the spring. The lower base plate is provided with a spring guide body for positioning and guiding the spring.

5. The device for detecting the status of a central telescopic discharge pipe for a coal storage bin according to claim 1, characterized in that, The detector (23) includes an upper fixed frame and a lower movable frame arranged on the same vertical plane. The upper fixed frame is fixed on the upper surface of the connecting ring of the upper connecting fixed body (16), and the lower movable frame is fixed on the lower plane of the sealing ring. The upper fixed frame is provided with a rotating shaft, and an actuating arm is installed on the rotating shaft. The actuating arm has lever characteristics and several sensing holes are provided at one end of the actuating arm as sensing elements. A sensor (24) is installed on the upper fixed frame. The sensing point of the sensor (24) is directly facing the sensing element. The sensor (24) is connected to the Eurowarehouse control system. When the sensor (24) is close to these sensing elements, it triggers the generation of an electrical signal and transmits it to the Eurowarehouse control system to reflect the current extension and retraction state of the central telescopic discharge pipe (6).

6. The device for detecting the status of a central telescopic discharge pipe for a coal storage bin according to claim 5, characterized in that, The connecting pin of the actuator arm is connected to the lower movable frame through the connecting rod, so that the relative displacement between the upper connecting fixed body (16) and the lower connecting sliding body (15) is converted into the rotation angle of the actuator arm, and the movement of the sensing body can be sensed by the sensor (24).

7. A status detection device for a central telescopic discharge pipe for a coal storage bin according to any one of claims 5 to 6, characterized in that, The sensor (24) is specifically a non-contact proximity limiter.

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