Multi-section type coal drop pipe

Abstract

The utility model discloses a multi-section type coal dropping pipe which comprises a discharging pipe, the discharging pipe comprises a feeding port located at the upper end and a discharging port located at the lower end, the feeding port is used for receiving distributed materials, and the materials flow through the discharging pipe and are discharged through the discharging port; the discharging pipe comprises a plurality of pipe sections, the pipe sections comprise at least one rotationally symmetrical pipe section, the rotationally symmetrical pipe section is detachably connected with the adjacent pipe section, and the circumferential installation position of the rotationally symmetrical pipe section can be adjusted in the circumferential direction. The non-worn inner wall of the rotationally symmetrical pipe section occupies the position of the inner wall which is worn after being used for a period of time.

Description

TECHNICAL FIELD

[0001] The utility model relates to material distribution technical field, especially a kind of multi-section coal falling pipe. BACKGROUND

[0002] Coal falling pipe is one of the main devices of coal transfer station of thermal power plant, usually including two discharge pipes, and the discharge pipe includes feed inlet at upper end and discharge outlet at lower end; Coal falling pipe also includes coal distribution mechanism, which is arranged to selectively distribute the material received from upstream to one of the two discharge pipes. During the operation of the coal falling pipe, coal will quickly fall along the discharge pipe, and the rapidly falling material will impact a specific part of the discharge pipe wall, i.e., the lower wall of the discharge pipe relative to the direction of gravity, and generate friction with the pipe wall, thereby causing damage and wear to the pipe wall at that part. In the case of using a discharge pipe with an integral structure, when the damage and wear of the pipe wall reach a certain degree, the entire discharge pipe needs to be replaced, which results in a significant increase in equipment cost and an extension of downtime.

[0003] Therefore, there is a need in the industry for a coal falling pipe with low maintenance cost, high maintenance efficiency and short maintenance downtime. SUMMARY

[0004] The utility model aims at overcoming the defects of the prior art, and aims to provide a coal falling pipe which can effectively reduce maintenance cost, improve maintenance efficiency and significantly reduce maintenance downtime, and has a simple structure and low cost.

[0005] To achieve the above-mentioned purpose, according to the utility model, a multi-section coal falling pipe is provided, which includes a discharge pipe, the discharge pipe includes a feed inlet at the upper end and a discharge outlet at the lower end, the feed inlet is used to receive the distributed material, the material flows through the discharge pipe and is discharged through the discharge outlet; characterized in that,

[0006] The discharge pipe includes a plurality of pipe sections, the plurality of pipe sections includes at least one rotationally symmetric pipe section, the at least one rotationally symmetric pipe section is detachably connected with the adjacent pipe section, and the circumferential installation position of the rotationally symmetric pipe section can be adjusted along the circumference, so that the non-worn inner wall of the rotationally symmetric pipe section occupies the position of the inner wall worn after a period of use.

[0007] Preferably, the discharge pipe includes a main pipe section and a lower end pipe section, the main pipe section is a rotationally symmetric pipe section; the upper end of the main pipe section forms the feed inlet, and the lower end of the lower end pipe section forms the discharge outlet.

[0008] Preferably, the discharge pipe includes an upper pipe section, a middle pipe section and a lower end pipe section, wherein the upper pipe section and the middle pipe section are rotationally symmetric pipe sections.

[0009] Preferably, the upper pipe section is composed of an upper square-round pipe section and a lower conical pipe section, and the middle pipe section is a cylindrical pipe section.

[0010] Preferably, the upper pipe section is a square-round pipe section, and the middle pipe section is composed of an upper conical pipe section and a lower cylindrical pipe section.

[0011] Preferably, the blanking pipe comprises, from top to bottom, a square-round pipe section, a conical pipe section, a cylindrical pipe section and a lower end pipe section, wherein the square-round pipe section, the conical pipe section and the cylindrical pipe section are rotationally symmetrical pipe sections.

[0012] Preferably, the lower end pipe section is an elbow pipe.

[0013] Preferably, the at least one rotationally symmetrical pipe section and the adjacent pipe section are detachably connected through flanges; a plurality of circumferentially spaced first connecting holes are formed on the flange of the at least one rotationally symmetrical pipe section; a plurality of circumferentially spaced second connecting holes are formed on the flange of the adjacent pipe section, and the at least one rotationally symmetrical pipe section and the adjacent pipe section are connected through the first connecting holes, the second connecting holes and bolts and nuts, and the circumferential installation position of the rotationally symmetrical pipe section is adjusted through the circumferential displacement of the first connecting holes relative to the second connecting holes.

[0014] Preferably, the first connecting holes are uniformly spaced in the circumferential direction, and the second connecting holes are uniformly spaced in the circumferential direction.

[0015] Preferably, the first connecting holes and / or the second connecting holes are formed as waist holes.

[0016] Preferably, the number of the first connecting holes is N times the number of the second connecting holes, wherein N is an integer greater than or equal to 1; or the number of the second connecting holes is N times the number of the first connecting holes, wherein N is an integer greater than or equal to 1.

[0017] Preferably, the rotationally symmetrical pipe section comprises a square-round pipe section, a conical pipe section, a cylindrical pipe section, a cylindrical pipe section with a cross section in the shape of a regular polygon, or a conical pipe section with a cross section in the shape of a regular polygon.

[0018] The utility model discloses a technical scheme, the coal falling pipe adopts multistage structure, and the blanking pipe includes a plurality of pipe sections, and the plurality of pipe sections include at least one rotationally symmetrical pipe section, and the at least one rotationally symmetrical pipe section and the adjacent pipe section are detachably connected with each other, and the circumferential installation position of the rotationally symmetrical pipe section can be adjusted along the circumference. After wearing, for the rotationally symmetrical pipe section, it can rotate three times or more, thereby improving the wear resistance by at least three times, and for the non-rotationally symmetrical pipe section, the replacement after wearing is also limited to a local pipe section. Therefore, the utility model discloses a technical scheme, which can greatly reduce the cost, improve the maintenance efficiency and reduce the downtime. BRIEF DESCRIPTION OF DRAWINGS

[0019] The utility model will be further explained in detail below in combination with the drawings and examples, wherein

[0020] Figure 1 is a perspective view, and it illustrates the overall structure of the material transfer device according to the utility model;

[0021] Figure 2 is a perspective view, and it illustrates the overall structure of the material transfer device according to the utility model from another angle;

[0022] Figure 3 is a partial perspective view, and it illustrates the lower end pipe section of the blanking pipe matched with the main pipe section;

[0023] Figure 4 is a perspective view of the lower end pipe section of the blanking pipe;

[0024] Figure 5 is a view similar to Figure 3 , and it illustrates the lower end pipe section of the blanking pipe matched with the main pipe section from another angle;

[0025] Figure 6 is a perspective view of the main pipe section of two blanking pipes;

[0026] Figure 7 is a front view of the material transfer device according to the utility model;

[0027] Figure 7A is a partial plan view, and it illustrates the batching mechanism in one working position;

[0028] Figure 7B is a partial plan view, and it illustrates the batching mechanism in another working position

[0029] Figure 8 is a partial plan view, and it illustrates the driving device of the batching mechanism;

[0030] Figure 9 is a partial perspective view, and it illustrates the batching mechanism, its driving device and the arc-shaped flow guide plate;

[0031] Figure 9A is Figure 9 a top view of the partial structure shown in Fig. 1;

[0032] Figure 10 is a partial perspective view illustrating one structure of the driving device of the dosing mechanism; and

[0033] Figure 11 is a partial perspective view illustrating another structure of the driving device of the dosing mechanism. DETAILED DESCRIPTION

[0034] The material transfer device of the present application will be described in detail below in conjunction with the accompanying drawings and embodiments. It should be pointed out here that the embodiments of the present application are merely illustrative and are only used to explain the principle of the present application but not to limit the present application.

[0035] Firstly, refer to Figure 1 and Figure 2 which illustrate the overall structure of the material transfer device according to the present application in the form of a perspective view, the material including but not limited to coal and the like. As shown in Figure 1 and Figure 2 , the material transfer device comprises a material conveying belt conveyor 1, a coal drop pipe 70 and a conveying belt conveyor 90 and the like. The coal drop pipe 70 is used to receive the material conveyed by the material conveying mechanism such as the material conveying belt conveyor 1 and to deliver the received material to a downstream device such as the conveying belt conveyor 90. The coal drop pipe 70 comprises two discharge pipes 2, each of which comprises a feeding port 3 at the upper end and a discharging port 4 at the lower end; and a dosing mechanism 10 (see Figure 7 ) arranged upstream of the discharge pipes to selectively distribute the received material to one of the two discharge pipes. The material flowing out of the discharging port 4 of the discharge pipe is discharged onto the belt of the conveying belt conveyor 90 and is sent downstream by the conveying belt conveyor 90.

[0036] Refer to Figure 1 and Figure 2 , according to the present application, as a preferred technical solution, the lower end pipe section 22 of the discharge pipe is in the form of an elbow pipe, which is bent towards the running direction of the upper belt section of the conveying belt conveyor 90. The elbow pipe can be a single-section elbow pipe or a multi-section elbow pipe, such as Figures 3-5As shown, the specific structure can be selected according to the specific application; in addition, the shape of the discharge port at the lower end of the elbow pipe can be selected as any suitable shape according to the actual application. By adopting the curved design of the elbow pipe, on the one hand, the falling coal flow will impact the elbow pipe section before flowing out of the discharge port of the discharge pipe, so that the elbow pipe section can play a buffering role on the coal flow; on the other hand, the flow direction of the material flowing out of the discharge port of the discharge pipe forms an acute angle with the advancing direction of the upper belt section, thereby reducing the impact of the material on the belt. Compared with the case where the material flowing out of the discharge port of the discharge pipe falls almost vertically on the belt of the belt conveyor, the impact and damage of the material on the belt are reduced.

[0037] Due to various factors, including, for example, the running speed of the material conveying belt conveyor 1, the size of the material particles, the water content of the material, the positioning of the flow guide plate 36 provided at the inlet of the coal falling pipe (if provided, please refer to Figure 9 ), and the like, when the coal falling pipe is assembled and put into use, the main flow of the material flowing out of the discharge port of the discharge pipe may not fall to the middle position of the belt of the conveying belt conveyor 90, which will have a serious impact on the conveying of the material.

[0038] In order to avoid the above situation, according to the first aspect of the present application, as Figure 1 shown, the discharge pipe 2 comprises a main pipe section 21 and a lower end pipe section 22, the main pipe section 21 and the lower end pipe section 22 are independent components, and are detachably connected to each other, and the circumferential installation position of the lower end pipe section relative to the main pipe section can be adjusted along the circumference, thereby forming a coal falling pipe with an adjustable orientation of the discharge port. By adjusting the circumferential position of the lower end pipe section relative to the main pipe section, the position of the discharge port of the discharge pipe can be adjusted, thereby ensuring that the main flow of the material flowing out of the discharge port of the discharge pipe falls to the middle position of the belt, and further ensuring the smooth conveying of the material.

[0039] Therefore, as Figures 3-5 shown, in particular Figure 4 , the upper end of the lower end pipe section 22 is formed with a flange 221, and the flange 221 is formed with a connecting hole 222; correspondingly, as Figure 5 shown, the main pipe section 21( Figures 3-5The lower end of the lower end pipe section 22 (only a part of the main pipe section is shown) is provided with a flange 211, and a connecting hole 212 is formed on the flange 211, so that the detachable connection between the lower end pipe section and the main pipe section can be realized through the connecting holes 222, 212 on the flanges 221, 211 and the bolts and nuts. In order to facilitate the circumferential adjustment of the lower end pipe section 22 relative to the main pipe section 21, the connecting holes can be uniformly spaced apart in the circumferential direction on the flange 221 and the flange 211 respectively, and the number of the connecting holes on one of the two flanges is set to be a multiple of the number of the connecting holes on the other flange, such as 1 times, 2 times, 3 times, etc. For example, 12 connecting holes are formed on the flange 221, and 12, 24 or 36 connecting holes, etc. can be formed on the flange 211. In this case, the minimum angle of the circumferential adjustment of the lower end pipe section 22 relative to the main pipe section 21 corresponds to the interval angle between the connecting holes on the flange with more connecting holes, so that the minimum angle of the circumferential adjustment of the lower end pipe section can be controlled by controlling the circumferential interval angle between the connecting holes on the flange.

[0040] It should be noted that although the connecting holes on the flanges 221 and 211 are uniformly spaced apart in the circumferential direction, this is a preferred scheme, but it is not necessary, and various other means can be adopted to realize the detachable connection between the main pipe section 21 and the lower end pipe section 22 and the adjustment of the circumferential installation position of the lower end pipe section relative to the main pipe section. For example, an elongated circular arc hole can be formed on the flange 221 every 120 degrees, and the circumferential span of the circular arc hole can be 20 degrees, for example; and a group of circular holes corresponding to one of the elongated circular arc holes can be formed on the flange 211 every 120 degrees, for example, and the number of the circular holes is 3. During the actual connection process, as long as at least one of the three circular holes is located within the range of the elongated circular arc hole, the detachable connection between the lower end pipe section and the main pipe section and the circumferential adjustment of the lower end pipe section relative to the main pipe section can be realized.

[0041] As a preferred technical scheme, as shown in Figure 4 The connecting holes on the flange 221 of the lower end pipe section 22 and / or the flange 211 of the main pipe section 21 are formed as waist holes, so that in addition to the circumferential installation position adjustment of the lower end pipe section through the circumferential displacement of the connecting holes, the fine adjustment of the circumferential installation position can also be realized by means of the waist holes, so that the lower end pipe section 22 can realize more accurate adjustment of the circumferential installation position.

[0042] In the above described scheme, the main tube section and the lower end tube section are detachably connected and circumferentially adjusted by connecting holes on the respective flanges and bolts and nuts, but the utility model is not limited to this, and various other schemes can be used. For example, an inner sleeve can be provided at the lower end of the main tube section, and the upper end of the lower end tube section forms an outer sleeve. When connected, the inner sleeve at the lower end of the main tube section is inserted into the outer sleeve at the upper end of the lower end tube section, and then a clamp is used to fasten the connection part of the main tube section and the lower end tube section, which can also achieve the same purpose.

[0043] During the operation of the coal drop pipe, the material is distributed to one of the two discharge pipes by the distribution mechanism and is transported onto the belt of the conveyor belt conveyor 90 through the discharge pipe. During the transportation of the material through the discharge pipe, the material usually does not fill the entire cross section of the discharge pipe, and in most cases, only occupies 1 / 3-1 / 4 of the cross section of the discharge pipe. The rapidly falling material will impact a specific part of the wall of the discharge pipe, i.e., the lower wall of the discharge pipe relative to the direction of gravity, and generate friction with the wall, thereby causing damage and wear of the wall at this part. In the case of using a discharge pipe with an integral structure, when the damage and wear of the wall reach a certain degree, the entire discharge pipe needs to be replaced, thereby greatly increasing the equipment cost and prolonging the downtime.

[0044] In order to overcome this defect, according to the second aspect of the utility model, as shown in Figure 2 and Figure 6 , the provided discharge pipe 2 adopts a multi-section (i.e., two sections or more than two sections) form, i.e., the discharge pipe 2 includes multiple tube sections, thereby constituting a multi-section coal drop pipe. The discharge pipe 2 shown in the figure includes four tube sections, i.e., a square-round joint tube section 25, a truncated cone tube section 26, a cylindrical tube section 27, and a lower end tube section 22. The adjacent tube sections of the multiple tube sections are detachably connected. The specific connection method can adopt the technical means described in the foregoing in combination with the first aspect of the utility model, and the description thereof is omitted for the sake of simplicity. In the present application and other parts of the specification, the multiple tube sections include two tube sections and more than two tube sections.

[0045] The technical scheme according to the second aspect of the utility model is particularly suitable for a discharge pipe including a rotationally symmetrical tube section. The rotationally symmetrical tube section referred to in the present application refers to a tube section that can be connected with an adjacent tube section without changing the geometric shape of the discharge pipe by rotating the tube section relative to the adjacent tube section by a certain angle, and the angle includes but is not limited to +90 degrees, +180 degrees, -90 degrees, +120 degrees, or -120 degrees, etc. The rotationally symmetrical tube section and the adjacent tube section are detachably connected, and the circumferential installation position can be adjusted relative to the adjacent tube section. The specific connection and adjustment method can adopt the technical means described in the foregoing in combination with the first aspect of the utility model, and the description thereof is omitted for the sake of simplicity.

[0046] In Figure 2 andFigure 6 Among the pipe segments of the downcomer shown in FIG. 1, the square-round segment 25, the truncated cone segment 26 and the round segment 27 are all rotationally symmetrical pipe segments. For the square-round segment 25, it can be rotated by an angle of +90 degrees, +180 degrees or -90 degrees relative to the adjacent pipe segment in the circumferential direction, and still be connected with the adjacent pipe segment, i.e. the conical segment 26, without changing the geometry of the downcomer; for the truncated cone segment 26 and the round segment 27, they can be rotated by any angle relative to the adjacent pipe segment in the circumferential direction, and still be connected with the adjacent pipe segment without changing the geometry of the downcomer. In the illustrated embodiment, the lower end segment 22 is a non-rotationally symmetrical pipe segment, but the present application is not limited thereto, and the lower end segment 22 can also be a rotationally symmetrical pipe segment, such as a cylindrical segment.

[0047] As mentioned above, Figure 1 , Figure 2 and Figure 6 The downcomer shown in FIG. 1 comprises three rotationally symmetrical pipe segments, i.e. the square-round segment 25, the truncated cone segment 26 and the round segment 27, but this is only an example, and the downcomer of the present application can be segmented in other forms, for example, the square-round segment 25 and the truncated cone segment 26 can be combined into one rotationally symmetrical pipe segment, or the truncated cone segment 26 and the round segment 27 can be combined into one rotationally symmetrical pipe segment, or the square-round segment 25, the truncated cone segment 26 and the round segment 27 can be combined into one rotationally symmetrical pipe segment; in addition, the downcomer can also be segmented into more than three rotationally symmetrical pipe segments.

[0048] By using the technical solution according to the second aspect of the present application, when the degree of wear of the inner wall of the downcomer cannot meet the further use requirements, if the wear occurs in the rotationally symmetrical pipe segment, the connection between the rotationally symmetrical pipe segment and the adjacent pipe segment can be disassembled, the rotationally symmetrical pipe segment can be rotated by a certain angle, such as +90 degrees, +180 degrees or -90 degrees, relative to the adjacent pipe segment in the circumferential direction, so that the non-worn inner wall of the rotationally symmetrical pipe segment occupies the position of the worn inner wall, and then the rotationally symmetrical pipe segment and the adjacent pipe segment are fixedly connected together; if the wear occurs in the non-rotationally symmetrical pipe segment, the non-rotationally symmetrical pipe segment can be disassembled and replaced with a new one.

[0049] In this way, for the rotationally symmetrical pipe segment, it can be rotated theoretically three times or more, thereby improving the wear resistance by at least three times; for the non-rotationally symmetrical pipe segment, the replacement after wear is limited to a certain local pipe segment only. Therefore, by using the technical solution according to the second aspect of the present application, the cost can be greatly reduced, and the maintenance efficiency can be improved and the downtime can be reduced. In addition, in addition to the types of rotationally symmetrical pipe segments mentioned above, the rotationally symmetrical pipe segments also include cylindrical pipe segments with a cross section in the shape of a regular polygon or conical pipe segments with a cross section in the shape of a regular polygon, etc., which are not particularly limited by the present application.

[0050] Referring to Figure 2 andFigure 6 According to the third aspect of the present application, a technical solution is described. As shown in Figure 2 In order to prevent the falling material in the downpipe from causing dust to fly and pollute the environment during the operation of the material transfer device, a tunnel dust cover 6 is usually arranged on the belt of the conveying belt conveyor 90, and various types of dust removal devices known to those skilled in the art can also be arranged in the dust cover 6.

[0051] According to the third aspect of the present application, in addition to arranging a tunnel dust cover 6 on the belt of the conveying belt conveyor 90, in order to further improve the dust removal effect, a negative pressure self-dust suppression air guide pipe 7 is arranged between the downpipe 2 and the dust cover 6, and the negative pressure self-dust suppression air guide pipe 7 communicates the internal space enclosed by the dust cover with the internal space of the downpipe 2. For this purpose, as shown in Figure 2 One end of the negative pressure self-dust suppression air guide pipe 7 is connected with the communication port 71 formed on the dust cover, and the other end is connected with the connecting hole 28 on the downpipe 2.

[0052] As described above, during the operation of the coal falling pipe, the material flows rapidly from top to bottom through the downpipe, and due to the very fast flow of coal, a certain degree of negative pressure is formed in the downpipe. Since the internal space enclosed by the dust cover 6 and the internal space of the downpipe 2 are communicated with each other through the negative pressure self-dust suppression air guide pipe 7, in the case of a certain degree of negative pressure in the downpipe 2, part of the air in the dust cover internal space containing dust will enter the downpipe through the negative pressure self-dust suppression air guide pipe 7, and after entering the downpipe, the dust carried in the air is adsorbed on the moving coal, thereby playing a certain dust suppression effect.

[0053] As a preferred technical solution, the end of the negative pressure self-dust suppression air guide pipe 7 connected with the dust cover is in the form of a bell mouth, as shown in Figure 2 , thereby appropriately enhancing the suction effect. When the material flows rapidly from top to bottom through the downpipe, it basically flows along the lower wall of the downpipe relative to the direction of gravity, and it is a preferred solution to arrange the connecting hole 28 to avoid the coal flow, and for this purpose, the connecting hole 28 on the downpipe for connecting the negative pressure self-dust suppression air guide pipe can be arranged at a position appropriately away from the lower wall of the downpipe.

[0054] The negative pressure self-dust suppression air guide pipe 7 can be used in combination with the downpipe according to the second aspect of the present application, in which case, if the connecting hole 28 on the downpipe is located on a rotationally symmetrical pipe section, such as a truncated conical pipe section 26, as shown in Figure 6 , a plurality of circumferentially spaced connecting holes can be arranged on the truncated conical pipe section 26, Figure 6The conical tube segment 26 shown in the figure is provided with four connecting holes. Thus, when the rotationally symmetrical tube segment is adjusted in the circumferential installation position due to internal wear, the negative pressure self-dust-suppression air guide pipe 7 can be connected with the connecting hole in the corresponding orientation. For the connecting hole 28 that is not used in operation, a cover 29 can be used to block it. As for the setting position of the connecting hole 28 in the height direction of the drop tube, the utility model does not make special limitations, and the middle position of the drop tube and the position above the middle are more preferred. In addition, as a preferred scheme, a filter screen can be arranged at the connecting port 71 of the dust cover and the connecting hole 28 of the drop tube 2 to prevent coal cinder and the like from entering the negative pressure self-dust-suppression air guide pipe 7.

[0055] As described above, the coal drop pipe includes a batching mechanism arranged upstream of the drop tube, which is used to selectively distribute the received material to one of the two drop tubes. The batching mechanism according to the fourth aspect of the utility model will be described below. Figures 7-11 As shown in Figure 7 and Figure 7A , the batching mechanism 10 includes a flow guide pipe cylinder 11, the upper end of the flow guide pipe cylinder is a feeding port 71, the lower end of the flow guide pipe cylinder is a discharging port 72, and the upper part of the flow guide pipe cylinder 11 is pivotally installed on a support. The support can be embodied in various forms, such as a housing form surrounding the feeding port 3 of the drop tube and the flow guide pipe cylinder 11, and more commonly, a tee joint 12 as shown in Figure 8 , Figure 9 and Figure 10 , Figure 11 . In the case of using the tee joint 12 as the support, as shown in Figure 9 , the tee joint 12 can include a feeding port 31 and discharging ports 32 and 33, and the two discharging ports 32 and 33 are respectively connected with the feeding ports 3 of the two drop tubes 2. In the technical scheme of the utility model, the support should be understood in a broad sense, which includes various fixed structures of the coal drop pipe.

[0056] As an example of the installation mode of the flow guide pipe cylinder 11 on the support, as shown in Figure 7 , Figure 8 and Figure 9 , a pin shaft 13 coaxial with and extending away from the outer wall of the flow guide pipe cylinder 11 is arranged on the upper part of the flow guide pipe cylinder 11, the pin shaft 13 constitutes a pivot shaft around which the flow guide pipe cylinder 11 pivots, and a corresponding mounting hole 14 (see Figure 8 ) is formed in the support (i.e., the tee joint 12 in the embodiment), whereby the flow guide pipe cylinder 11 can be pivotally installed on the support, so that the flow guide pipe cylinder 11 can swing to both sides around the pivot shaft, and therefore the flow guide pipe cylinder 11 can be called a pendulum flow guide pipe cylinder; as a preferred technical scheme, the pin shaft 13 or the pivot shaft is installed in the mounting hole of the support through a bearing.

[0057] In the embodiment shown, the dosing mechanism 10 is embodied in the form of a flow guide cylinder 11, but the specific geometry of the flow guide cylinder is not particularly limited in the present application, and it can be in the form of a straight cylinder, such as a cylindrical shape, a polygonal cylinder with a polygonal cross section, and the like, or it can be in the form of a tapered cylinder, such as a conical cylinder, a polygonal conical cylinder with a polygonal cross section, and the like, or it can be in the form of a cylinder with an asymmetric cross section, and the like, as long as it can smoothly deliver the received material to the two discharge pipes. The inlet and outlet of the flow guide cylinder can be in any shape, for example, the inlet can be square and the outlet can be circular, the inlet can be oval and the outlet can be circular, and the like; as a preferred solution, the cross section of the inlet is larger than the cross section of the outlet.

[0058] In order to deliver the received material to one of the two discharge pipes, the flow guide cylinder 11 is arranged to be able to swing between two working positions under the drive of the driving device: in the first working position, the outlet of the flow guide cylinder 11 is aligned with the inlet of one of the two discharge pipes; in the second working position, the outlet of the flow guide cylinder 11 is aligned with the inlet of the other of the two discharge pipes. Figure 7A and Figure 7B The flow guide cylinder 11 is shown in two different working positions.

[0059] The driving device for driving the flow guide cylinder 11 to swing between the two working positions can take various forms and is well known to those skilled in the art. As an example, please refer to Figure 10 and Figure 11 The driving device 15 can take the form of, for example, a pneumatic driving device, a hydraulic driving device, an electro-hydraulic driving device, or an electric driving device, and the like, for linearly extending and retracting the driving rod 16, Figure 8 Fig. 2 shows the driving rod 16 in the retracted state, while Figure 9 Fig. 3 shows the driving rod 16 in the extended state. As shown in Figure 8 and Figure 9 A pin shaft 17 is provided on the lower outer wall of the flow guide cylinder 11, and the pin shaft 17 is preferably arranged parallel to the pivot shaft about which the flow guide cylinder 11 pivots.

[0060] Please refer to Figure 10 which shows a form of the driving device. As shown in Figure 10 The driving device 15 is rotatably mounted on a mounting bracket 52 through a rotating shaft 51, and the mounting bracket 52 is fixedly mounted on the bracket, and the front end of the driving rod 16 is formed with a hinged hole, and the driving rod is hinged with the pin shaft 17 of the flow guide cylinder 11. During operation, the driving device drives the driving rod 16 to extend and retract, and the driving rod 16 drives the flow guide cylinder 11 to rotate through the pin shaft 17 and positions it in the first working position or the second working position.

[0061] Please refer to Figure 11which illustrates another form of the driving device. As shown in the figure Figure 11 The driving device 15 is fixedly mounted on the mounting bracket 55, and the front end of the driving rod is formed with a long slot 53 extending in a direction perpendicular to the length direction of the rod. The pin shaft 17 at the lower side of the draft tube cylinder 11 is inserted into the long slot 53 and connected with the driving rod, and the pin shaft 17 can move along the long slot 53. During operation, the driving device drives the driving rod 16 to move in an extending and retracting manner, and the driving rod 16 drives the draft tube cylinder 11 to rotate through the pin shaft 17 and positions the draft tube cylinder 11 at the first working position or the second working position.

[0062] In order to adapt to the pivoting of the draft tube cylinder 11, the bracket, such as the tee joint 12, is formed with an arc-shaped slot 20 with the center of rotation of the draft tube cylinder 11 as the center, please refer to Figure 8 , Figure 10 and Figure 11 . In the assembled state, the pin shaft 17 of the draft tube cylinder 11 passes through the arc-shaped slot and is connected with the driving rod 16.

[0063] In the above-described technical scheme of the fourth aspect of the present application, the pin shaft 13 serving as the pivoting shaft is arranged at the upper part of the draft tube cylinder 11, and the pin shaft 17 serving as the driving part is arranged at the lower part of the draft tube cylinder 11. The present application is not limited to this, but other forms can also be adopted, for example, the positions of the pin shaft 13 and the pin shaft 17 can be interchanged, in which case the arrangement position of the driving device needs to be adjusted accordingly; in addition, the pin shaft 13 can be arranged at the middle part of the draft tube cylinder 11, and the like.

[0064] Regarding the fourth aspect of the present application, the essence lies in that the batching mechanism adopts a pendulum type design form, and switches between the first working position and the second position through swinging, thereby realizing the selective distribution of the material to the two discharge pipes. Regarding the driving device, the present application is not particularly limited, and various driving devices for driving a component to pivotally rotate, which exist in the prior art and are well known to those skilled in the art, can be adopted. Regarding the arc-shaped slot, other forms can also be adopted instead, such as a rectangular opening formed on the bracket, and the like, as long as the movement of the pin shaft 17 is not interfered.

[0065] In the shown embodiment, the driving device is arranged outside the bracket or the shell, and the present application is not limited to this. As an alternative technical scheme, the driving device can also be arranged inside the bracket or the shell, in which case the arc-shaped slot and the like for avoiding the movement of the pin shaft 17 can also be omitted. Moreover, in the shown embodiment, the tee joint 12 is used as the support base for components such as the pin shaft 13, the mounting brackets 52, 55, and the like, and according to the present application, the tee joint can also be omitted, in which case the components such as the pin shaft 13, the mounting brackets 52, 55, and the like, which use the tee joint as the support base, can be supported on other parts of the bracket, such as the discharge pipes.

[0066] As a preferred technical solution, an arc-shaped flow guide plate 36 can be arranged at the feed inlet of the coal drop pipe, and an open surface thereof faces the material distributed from the upstream, so as to guide the material into the flow guide pipe cylinder 11. Figure 7 and Figure 9 As shown in the figures, the material conveying belt machine 1 conveys the material to the feed inlet 37, and the material leaving the material conveying belt machine 1 collides on the arc-shaped flow guide plate 36, and then flows downward along the arc-shaped flow guide plate into the flow guide pipe cylinder 11. The flow guide plate shown in the figures is arc-shaped, but the utility model is not limited thereto, and the flow guide plate can adopt any other structure with a groove-shaped cross section, and the baffle or wing plate on both sides of the flow guide plate has a flow regulating effect to prevent the coal flow from scattering to both sides. As a preferred solution, the flow guide plate gradually converges from top to bottom, that is, the cross section gradually decreases, so as to achieve the effect of converging and regulating flow.

[0067] As shown in the figures, Figure 7 , Figure 9 and Figure 9A As a preferred technical solution, the arc-shaped flow guide plate 36 is pivotally installed on the support and can rotate about the pivot, so as to adjust the position of the arc-shaped flow guide plate 36 relative to the flow guide pipe cylinder 11 and / or the material conveying belt machine 1, thereby facilitating the conveying of the coal flow. For this purpose, as shown in the figures, Figure 7 , Figure 9 and Figure 9A A plurality of axially spaced lugs 39 are arranged on the back of the arc-shaped flow guide plate 36, and holes are formed in the lugs. The shaft 40 extends through the holes in the lugs and is fixedly connected with the holes, so that the shaft rotates together with the arc-shaped flow guide plate 36, and the two ends of the shaft 40 are fitted into the holes formed in the side wall of the housing 50. During the operation of the coal drop pipe, the working position of the arc-shaped flow guide plate 36 is adjusted according to whether the flow guide pipe cylinder 11 is in the first working position or the second working position, and after adjustment, the arc-shaped flow guide plate 36 can be locked by, for example, a locking nut. In addition, the arc-shaped flow guide plate 36 can be sleeved on the shaft 40 through the holes in the lugs 39, and can rotate relative to the shaft 40, so that the same driving device as the flow guide pipe cylinder 11 can be used to rotate the arc-shaped flow guide plate 36, and the description thereof is omitted herein.

[0068] Although the flow guide plate arranged at the feed inlet of the coal drop pipe is a preferred solution, the flow guide plate can also be omitted. In addition, as a modification solution, the batching mechanism 10 can include both the flow guide pipe cylinder 11 and the arc-shaped flow guide plate 36, that is, the arc-shaped flow guide plate is a component part of the batching mechanism 10 and extends upward along the flow guide pipe cylinder, and the flow guide pipe cylinder and the arc-shaped flow guide plate are fixedly connected or integrally formed. In addition, as shown in the figures, Figure 1 and Figure 9 The housing 50 can also be omitted as a modification solution.

[0069] In the above part of the application, the technical solutions of the first aspect to the fourth aspect of the utility model are described respectively, and the contents of these aspects can constitute a technical solution alone, or two aspects, three aspects or four aspects among them can be combined to constitute a corresponding combined technical solution.

[0070] The utility model has been described above with reference to the drawings in combination with specific embodiments, but this is only for the purpose of illustration, and the utility model is not limited thereto. Therefore, it is obvious for those skilled in the art that various changes and modifications can be made within the technical spirit and scope of the utility model, and these changes and modifications should also be understood as belonging to the category of the utility model, and the scope of the utility model is defined by the technical scheme claimed and its equivalent schemes.

Claims

1. A multi-section coal drop pipe comprising a drop pipe having a feed inlet at an upper end and a discharge outlet at a lower end, the feed inlet being configured to receive a material to be delivered, the material flowing through the drop pipe and being discharged through the discharge outlet; characterized in that, the drop pipe comprises a plurality of pipe sections, the plurality of pipe sections comprising at least one rotationally symmetrical pipe section, the rotationally symmetrical pipe section being detachably connected to an adjacent pipe section, and a circumferential mounting position of the rotationally symmetrical pipe section being adjustable along a circumferential direction, such that a non-worn inner wall of the rotationally symmetrical pipe section occupies a position of an inner wall worn over a period of use.

2. The multi-stage coal drop chute of claim 1, wherein, the drop pipe comprises a main pipe section and a lower end pipe section, the main pipe section being a rotationally symmetrical pipe section, an upper end of the main pipe section forming the feed inlet, a lower end of the lower end pipe section forming the discharge outlet.

3. The multi-stage coal drop chute of claim 1 wherein, the drop pipe comprises an upper pipe section, a middle pipe section and a lower end pipe section, the upper pipe section and the middle pipe section being rotationally symmetrical pipe sections.

4. The multi-stage coal drop chute of claim 3, wherein, the upper pipe section comprises an upper square-round pipe section and a lower conical pipe section, the middle pipe section being a cylindrical pipe section.

5. The multi-stage coal drop chute of claim 3 wherein, the upper pipe section is a square-round pipe section, the middle pipe section comprises an upper conical pipe section and a lower cylindrical pipe section.

6. The multi-stage drop chute of claim 1, wherein, the drop pipe comprises, from top to bottom, a square-round pipe section, a conical pipe section, a cylindrical pipe section and a lower end pipe section, the square-round pipe section, the conical pipe section and the cylindrical pipe section being rotationally symmetrical pipe sections.

7. A multi-stage coal drop chute according to any one of claims 2 to 6 wherein, the lower end pipe section is an elbow pipe.

8. The multi-stage drop chute of claim 1 wherein, the at least one rotationally symmetrical pipe section is detachably connected to the adjacent pipe section by flanges, the flange of the at least one rotationally symmetrical pipe section being formed with a plurality of circumferentially spaced first connecting holes, the flange of the adjacent pipe section being formed with a plurality of circumferentially spaced second connecting holes, the at least one rotationally symmetrical pipe section being connected to the adjacent pipe section by the first connecting holes, the second connecting holes and bolts and nuts, and the circumferential mounting position of the rotationally symmetrical pipe section being adjusted by circumferential displacement of the first connecting holes relative to the second connecting holes.

9. The multi-stage drop chute of claim 8, wherein, the first connecting holes are uniformly spaced along the circumferential direction, and the second connecting holes are uniformly spaced along the circumferential direction.

10. A multi-stage coal drop chute as claimed in claim 8 or 9, characterised in that, the first connecting holes and / or the second connecting holes are formed as slotted holes.

11. The multi-stage drop chute of claim 9, wherein, the number of the first connecting holes is N times the number of the second connecting holes, where N is an integer greater than or equal to 1, or the number of the second connecting holes is N times the number of the first connecting holes, where N is an integer greater than or equal to 1.

12. The multi-stage drop chute of claim 1 wherein, the rotationally symmetrical pipe section comprises a square-round pipe section, a conical pipe section, a cylindrical pipe section, a cylindrical pipe section having a cross section in the shape of a regular polygon, or a conical pipe section having a cross section in the shape of a regular polygon.

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