Coal drop pipe

Abstract

The utility model discloses a coal dropping pipe which comprises a batching mechanism and two discharging pipes, each discharging pipe comprises a feeding port and a discharging port, the feeding ports are used for receiving materials distributed by the batching mechanism, the materials flow through the discharging pipes and are discharged through the discharging ports, and the feeding ports of the two discharging pipes are adjacent to each other; the batching mechanism is arranged on the upstream of the discharging pipes, receives the materials and selectively distributes the received materials to one of the two discharging pipes; the batching mechanism comprises a flow guide pipe barrel, the upper end of the flow guide pipe barrel is a feed port, and the lower end is a discharge port; the batching mechanism is installed on the support through a pivot and arranged to swing between a first working position and a second working position around the pivot under the driving of the driving device, and at the first working position, a discharging port of the flow guide pipe barrel is aligned with a feeding port of one of the two discharging pipes; and at the second working position, the discharging opening of the flow guide pipe barrel is aligned with the feeding opening of the other one of the two discharging pipes.

Description

TECHNICAL FIELD

[0001] The utility model relates to material distribution technical field, in particular to a coal falling pipe. BACKGROUND

[0002] The coal falling pipe is one of the main devices of the coal transfer station of the thermal power plant, and usually includes two discharge pipes, each of which includes a feeding port at the upper end and a discharging port at the lower end. The coal falling pipe further includes a coal distribution mechanism, which is arranged to selectively distribute the material received from the upstream to one of the two discharge pipes. CN219751262U discloses a coal distribution mechanism, which includes a three-way form of a receiving pipe, and the two discharging ports of the receiving pipe are connected to the feeding ports of the discharge pipes, respectively. The receiving pipe is provided with a left guide rail and a right guide rail on the two sides corresponding to the left and right discharging ports, respectively. The left sliding plate along the left guide rail blocks the feeding port of the left discharge pipe, and the right sliding plate along the right guide rail blocks the feeding port of the right discharge pipe. The left and right sliding plates are used as gate doors. During operation, when the left sliding plate is in the open position and the right sliding plate is in the closed position, the left discharge pipe receives the material received by the coal falling pipe and transports the material downstream. Similarly, when the right sliding plate is in the open position and the left sliding plate is in the closed position, the right discharge pipe receives the material received by the coal falling pipe and transports the material downstream.

[0003] The above-mentioned traditional coal falling pipe has a complex structure, and the coal material is prone to blockage during transmission. Moreover, due to the use of the sliding plate guide rail structure, the coal residue is prone to adhere to the guide rail, which causes the sliding plate to be blocked or move slowly. Therefore, there is a demand for a coal falling pipe with improved material conveying and distribution performance in the industry. SUMMARY

[0004] The utility model aims at overcoming the defects existing in the prior art, and the purpose is to provide a coal falling pipe, which has a simple structure, low cost, reliable operation, and can ensure smooth conveying of the material.

[0005] To achieve the above-mentioned purpose, according to the utility model, a coal falling pipe is provided, which includes a distribution mechanism and two discharge pipes. Each of the discharge pipes includes a feeding port at the upper end and a discharging port at the lower end. The feeding port is used to receive the material distributed by the distribution mechanism, and the material flows through the discharge pipe and is discharged through the discharging port. The feeding ports of the two discharge pipes are adjacent to each other. The characteristic is that the distribution mechanism is arranged upstream of the two discharge pipes to receive the material and selectively distribute the received material to one of the two discharge pipes. The distribution mechanism includes a flow guide pipe cylinder, the upper end of which is a feeding port, and the lower end of which is a discharging port.

[0006] The distribution mechanism is arranged upstream of the two discharge pipes to receive the material and selectively distribute the received material to one of the two discharge pipes. The distribution mechanism includes a flow guide pipe cylinder, the upper end of which is a feeding port, and the lower end of which is a discharging port.

[0007] The dosing mechanism is pivotally mounted on the support and arranged to be pivoted about a pivot axis between a first working position and a second working position under the drive of the drive device, in the first working position, the discharge port of the flow guide cylinder is aligned with the feed port of one of the two discharge pipes, in the second working position, the discharge port of the flow guide cylinder is aligned with the feed port of the other of the two discharge pipes.

[0008] Preferably, the flow guide cylinder is a straight cylinder or a tapered cylinder.

[0009] Preferably, the pivot axis about which the dosing mechanism is pivoted is located at the upper portion of the flow guide cylinder.

[0010] Preferably, two first pins are arranged coaxially outside the upper portion of the flow guide cylinder and extend away from the outer wall of the flow guide cylinder, the two first pins constitute the pivot axis, and the support is provided with mounting holes in which the first pins are fitted.

[0011] Preferably, the coal drop pipe comprises a tee joint, the tee joint comprises a feed port and two discharge ports, the two discharge ports are respectively connected in communication with the feed ports of the two discharge pipes, the flow guide cylinder is located in the tee joint, and the tee joint constitutes the support.

[0012] Preferably, the drive device comprises a linearly telescopic drive rod, the drive device is rotatably mounted on the support via a rotating shaft, the front end of the drive rod is formed with a hinged hole, and the flow guide cylinder is provided with a second pin parallel to the pivot axis of the dosing mechanism and spaced apart from the pivot axis in the up-down direction, the drive rod is hinged to the second pin via the hinged hole.

[0013] Preferably, the drive device comprises a linearly telescopic drive rod, the drive device is fixedly mounted on the support, the front end of the drive rod is formed with a long slot extending in a direction perpendicular to the length direction of the drive rod, and the flow guide cylinder is provided with a second pin parallel to the pivot axis of the dosing mechanism and spaced apart from the pivot axis in the up-down direction, the second pin is inserted into the long slot to be connected to the drive rod.

[0014] Preferably, the drive device comprises a pneumatic drive device, a hydraulic drive device, an electro-hydraulic drive device, or an electric drive device.

[0015] Preferably, the coal drop pipe further comprises a slot-shaped flow guide plate, the open side of the slot-shaped flow guide plate faces the upstream distributed material, and the slot-shaped flow guide plate is used to guide the material into the flow guide cylinder.

[0016] Preferably, the slot-shaped flow guide plate gradually narrows from top to bottom in cross section.

[0017] Preferably, the slot-shaped flow guide plate is an arc-shaped flow guide plate.

[0018] Preferably, the slot-shaped guide plate is pivotally mounted on the bracket and can be adjusted in working position relative to the guide pipe cylinder by rotating about the rotation axis parallel to the pivot axis.

[0019] Preferably, the slot-shaped guide plate is fixedly connected with the guide pipe cylinder or integrally formed with the guide pipe cylinder and extends upward from the feed inlet of the guide pipe cylinder, and the slot-shaped guide plate and the guide pipe cylinder constitute the dosing mechanism.

[0020] Preferably, the cross section of the feed inlet of the guide pipe cylinder is larger than the cross section of the discharge outlet of the guide pipe cylinder.

[0021] Preferably, the first pin shaft is fitted in the mounting hole through a bearing.

[0022] Preferably, the guide pipe cylinder adopts a rotationally symmetrical structure, and the circumferential mounting position of the guide pipe cylinder can be adjusted in the circumferential direction so that the non-worn inner wall of the guide pipe cylinder occupies the position of the inner wall worn after a period of use.

[0023] Preferably, the angle of adjustment of the circumferential mounting position of the guide pipe cylinder in the circumferential direction includes +90 degrees, +180 degrees, -90 degrees, +120 degrees or -120.

[0024] Preferably, an arc-shaped groove with the pivot axis as the center is formed on the bracket, and the pin shaft passes through the arc-shaped groove and is connected with the driving rod.

[0025] Preferably, the bracket is a tee.

[0026] Preferably, the coal drop pipe comprises a sealing structure for plugging the arc-shaped groove.

[0027] Preferably, the sealing structure comprises an arc-shaped plate strip connected with the pin shaft and rotating together with the pin shaft, the arc-shaped plate strip is a plate strip with the pivot axis as the center, and in the connected state with the pin shaft, the arc-shaped plate strip extends from both sides of the pin shaft and always covers the arc-shaped groove, and the arc-shaped plate strip is fixedly connected with the pin shaft.

[0028] Preferably, the sealing structure comprises an arc-shaped plate strip connected with the pin shaft and rotating together with the pin shaft, the arc-shaped plate strip is a plate strip with the pivot axis as the center, and in the connected state with the pin shaft, the arc-shaped plate strip extends from both sides of the pin shaft and always covers the arc-shaped groove; an arc-shaped guide groove is arranged along the arc-shaped groove, the arc-shaped plate strip is inserted in the arc-shaped guide groove from one end of the arc-shaped guide groove, so that the inner plate surface of the arc-shaped plate strip abuts against the outer wall of the bracket, and the outer plate surface of the arc-shaped plate strip abuts against the inner wall of the arc-shaped guide groove; and the arc-shaped plate strip is fixedly connected or rotatably connected with the pin shaft.

[0029] According to the utility model another aspect provides a kind of material distribution method of coal chute, the coal chute includes batching mechanism and two discharge pipes, each the discharge pipe includes the feed inlet located upper end and the discharge outlet located lower end, the feed inlet is used to receive the material distributed by batching mechanism, the material flows through discharge pipe and is sent out via the discharge outlet, the feed inlet of two discharge pipes is adjacent to each other;

[0030] The batching mechanism is arranged upstream of the discharge pipe, including the flow guide pipe cylinder, the upper end of the flow guide pipe cylinder is the feed inlet, and the lower end of the flow guide pipe cylinder is the discharge outlet.

[0031] The batching mechanism is pivotally installed on the bracket and can be pivoted between the first working position and the second working position. In the first working position, the discharge outlet of the flow guide pipe cylinder is aligned with the feed inlet of one of the two discharge pipes. In the second working position, the discharge outlet of the flow guide pipe cylinder is aligned with the feed inlet of the other of the two discharge pipes. The method comprises:

[0032] pivoting the batching mechanism to the first working position or the second working position; and

[0033] receiving the upstream conveyed material via the feed inlet of the flow guide pipe cylinder and conveying the received material via the discharge outlet of the flow guide pipe cylinder to the discharge pipe whose feed inlet is aligned with the discharge outlet of the flow guide pipe cylinder.

[0034] By using the batching mechanism that can be pivoted between the first working position and the second working position, the utility model technical scheme can not only realize accurate distribution of material, but also has simple structure, low cost, reliable operation and reduced coal blocking phenomenon during operation of the coal chute. BRIEF DESCRIPTION OF DRAWINGS

[0035] The utility model will be further described in detail below in combination with the drawings and embodiments, in which

[0036] Figure 1 is a perspective view illustrating the overall structure of the material transfer device according to the utility model;

[0037] Figure 2 is a perspective view illustrating the overall structure of the material transfer device according to the utility model from another angle;

[0038] Figure 3 is a partial perspective view illustrating the lower end pipe segment of the discharge pipe connected with the main pipe segment;

[0039] Figure 4 is a perspective view of the lower end pipe segment of the discharge pipe;

[0040] Figure 5 is similar to Figure 3is a perspective view of the lower end pipe section of the downcomer pipe mated with the main pipe section from another angle;

[0041] Figure 6 is a perspective view of the main pipe section of the two downcomer pipes;

[0042] Figure 7 is a front view of the material transfer device according to the present application;

[0043] Figure 7A is a partial plan view, illustrating the dosing mechanism in one working position;

[0044] Figure 7B is a partial plan view, illustrating the dosing mechanism in another working position

[0045] Figure 8 is a partial plan view, illustrating the drive device of the dosing mechanism;

[0046] Figure 9 is a partial perspective view, illustrating the dosing mechanism and its drive device as well as the arc-shaped deflector plate;

[0047] Figure 9A is Figure 9 a top view of the partial structure shown;

[0048] Figure 10 is a partial perspective view, illustrating one structure of the drive device of the dosing mechanism;

[0049] Figure 11 is a partial perspective view, illustrating another structure of the drive device of the dosing mechanism; and

[0050] Figure 12 is a partial perspective view, illustrating a sealing structure of the arc-shaped groove. DETAILED DESCRIPTION

[0051] 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 noted here that the embodiments of the present application are merely illustrative and are only used to explain the principles of the present application but not to limit the present application.

[0052] 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 Figure 1 and Figure 2As shown, the material transfer device includes a material conveying belt conveyor 1, a coal drop pipe 70, and a transfer belt conveyor 90, etc. The coal drop pipe 70 is used to receive the material conveyed by the material conveying belt conveyor 1 and the like, and to deliver the received material to a downstream device, such as the transfer belt conveyor 90. The coal drop pipe 70 includes two drop pipes 2, each of which includes a feed inlet 3 at an upper end and a discharge outlet 4 at a lower end; a distribution mechanism 10 (see Figure 7 ) is arranged upstream of the drop pipes to selectively distribute the received material to one of the two drop pipes. The material flowing out of the discharge outlet 4 of the drop pipe is dropped onto the belt of the transfer belt conveyor 90 and is conveyed downstream by the transfer belt conveyor 90.

[0053] Please refer to Figure 1 and Figure 2 , according to the present application, as a preferred technical solution, the lower end portion pipe segment 22 of the drop pipe is in the form of an elbow pipe, which is curved towards the running direction of the upper belt segment of the transfer belt conveyor 90. The elbow pipe can be a single-segment elbow pipe or a multi-segment elbow pipe, such as Figures 3-5 As shown, the specific structure can be selected according to the specific application; in addition, the shape of the discharge outlet at the lower end of the elbow pipe can be selected as any suitable shape according to the actual application. By using the elbow pipe designed in a curved shape, on the one hand, the coal flow falling from the discharge outlet of the drop pipe will impact the elbow pipe segment before flowing out of the discharge outlet, so that the elbow pipe segment can play a buffering role for the coal flow; on the other hand, the flow direction of the material flowing out of the discharge outlet of the drop pipe forms an acute angle with the running direction of the upper belt segment, thereby reducing the impact of the material on the belt. Compared with the case where the material flowing out of the discharge outlet of the drop pipe falls almost vertically on the belt of the belt conveyor, the impact and damage of the material on the belt are reduced.

[0054] Due to various factors, including, for example, the running speed of the material conveying belt conveyor 1, the size of the material particles, the moisture content of the material, the positioning of the flow guide plate 36 at the feed inlet of the coal drop pipe (if provided, see Figure 9 ), and the like, when the coal drop pipe is assembled and put into use, the main flow of the material flowing out of the discharge outlet of the drop pipe may not fall to the middle position of the belt of the transfer belt conveyor 90, which will have a serious impact on the conveying of the material.

[0055] In order to avoid the above-mentioned situation, according to the first aspect of the present application, as Figure 1As shown, the feed pipe 2 includes 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 that are detachably connected to each other. The circumferential installation position of the lower end pipe section relative to the main pipe section can be adjusted circumferentially, thus forming a coal drop pipe with an adjustable discharge port position. By adjusting the circumferential position of the lower end pipe section relative to the main pipe section, the position of the feed pipe discharge port can be adjusted, thereby ensuring that the main stream of material flowing out of the feed pipe discharge port falls to the middle position of the conveyor belt, thus ensuring the smooth conveying of materials.

[0056] Therefore, such as Figures 3-5 in particular Figure 4 As shown, a flange 221 is formed at the upper end of the lower end pipe section 22, and a connection hole 222 is formed on the flange 221; correspondingly, as Figure 5 As shown, main pipe section 21 ( Figures 3-5 The lower end of the pipe section 22 (showing only a portion of the main pipe section) is provided with a flange 211, and a connection hole 212 is formed on the flange 211. This allows for a detachable connection between the lower end pipe section and the main pipe section via the connection holes 222 and 212 on the flanges 221 and 211, as well as bolts and nuts. To facilitate circumferential adjustment of the lower end pipe section 22 relative to the main pipe section 21, connection holes evenly spaced circumferentially can be formed on both the flanges 221 and 211. The number of connection holes on one flange is set to be a multiple of the number of connection holes on the other flange, such as 1, 2, 3, etc. For example, flange 221 may have 12 connection holes, while flange 211 may have 12, 24, or 36 connection holes, etc. In this case, the minimum angle for circumferential adjustment of the lower end pipe section 22 relative to the main pipe section 21 corresponds to the interval angle between the connection holes on the flange with a large number of connection holes. Thus, the minimum angle for circumferential adjustment of the lower end pipe section can be controlled by controlling the circumferential interval angle between the connection holes on the flange.

[0057] It should be noted that while it is preferable that the connecting holes on flanges 221 and 211 are evenly spaced circumferentially, this is not mandatory. Various other methods can be used to achieve a detachable connection between the main pipe section 21 and the lower pipe section 22, as well as to adjust the circumferential installation position of the lower pipe section relative to the main pipe section. For example, an elongated arc hole can be formed on flange 221 every 120 degrees, with a circumferential span of, for example, 20 degrees. On flange 211, a group of, for example, three circular holes corresponding to one of the elongated arc holes can be formed every 120 degrees. In actual connection, as long as at least one of the three circular holes is within the range of the elongated arc hole, a detachable connection between the lower pipe section and the main pipe section, as well as circumferential adjustment of the lower pipe section relative to the main pipe section, can be achieved.

[0058] As a preferred technical solution, as shown in Figure 4 The connecting holes on the flanges 221 of the lower end pipe section 22 and / or the flanges 211 of the lower pipe body 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 circumferential installation position can also be finely adjusted by means of the waist holes, so that the lower end pipe section 22 can achieve more accurate circumferential installation position adjustment.

[0059] In the above-described solution, the body pipe section and the lower end pipe section are detachably connected and circumferentially adjusted by the connecting holes on the respective flanges and the bolts and nuts, but the utility model is not limited thereto, and various other solutions can be used. For example, an inner sleeve can be provided at the lower end of the body pipe section, and the upper end of the lower end pipe section is formed as an outer sleeve. During connection, the inner sleeve at the lower end of the body pipe section is inserted into the outer sleeve at the upper end of the lower end pipe section, and then a clamp is used to fix the connection part of the body pipe section and the lower end pipe section, which can also achieve the same purpose.

[0060] During the operation of the coal drop pipe, the material is distributed to one of the two lower pipes by the batching mechanism and is transported to the belt of the conveyor belt conveyor 90 through the lower pipe. During the transportation of the material through the lower pipe, the material usually does not fill the entire lower pipe (here, the cross section), and in most cases, only occupies 1 / 3-1 / 4 of the cross section of the lower pipe. The rapidly falling material will impact a specific part of the lower pipe wall, i.e., the lower wall of the lower pipe relative to the direction of gravity, and generate friction with the pipe wall, thereby causing damage and wear of the pipe wall at this part. In the case of using a lower pipe with an integral structure, when the pipe wall damage and wear reach a certain degree, the entire lower pipe needs to be replaced, thereby greatly increasing the equipment cost and prolonging the downtime.

[0061] 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 lower pipe 2 adopts a multi-section (i.e., two sections or more than two sections) form, i.e., the lower pipe 2 includes multiple pipe sections, thereby constituting a multi-section coal drop pipe. The lower pipe 2 shown in the figure includes four pipe sections, i.e., a square-round section pipe section 25, a truncated cone pipe section 26, a cylindrical pipe section 27, and a lower end pipe section 22. The adjacent pipe sections of the multiple pipe sections are detachably connected. The specific connection method can use the technical means described in the first aspect of the utility model, and the description thereof is omitted for brevity. In the specification and other parts of this application, the multiple pipe sections include two pipe sections and more than two pipe sections.

[0062] The second aspect of the utility model is particularly suitable for a blanking pipe comprising rotationally symmetrical pipe sections. The rotationally symmetrical pipe sections are pipe sections that can be connected to adjacent pipe sections without changing the geometry of the blanking pipe, even if they are rotated by a certain angle relative to the adjacent pipe sections. The angle can be, but is not limited to, +90 degrees, +180 degrees, -90 degrees, +120 degrees, -120 degrees, etc. The rotationally symmetrical pipe sections are detachably connected to the adjacent pipe sections, and the circumferential mounting position can be adjusted relative to the adjacent pipe sections. The specific connection and adjustment method can be the technical means described above in connection with the first aspect of the utility model. For the sake of brevity, the description thereof is omitted.

[0063] In the pipe sections of the blanking pipe shown in Figure 2 and Figure 6 , the square-round section pipe section 25, the truncated cone pipe section 26, and the circular pipe section 27 are rotationally symmetrical pipe sections. For the square-round section pipe section 25, it can be rotated by an angle of +90 degrees, +180 degrees, or -90 degrees relative to the adjacent pipe section, i.e. the conical pipe section 26, without changing the geometry of the blanking pipe. For the truncated cone pipe section 26 and the circular pipe section 27, they can be rotated by any angle relative to the adjacent pipe section without changing the geometry of the blanking pipe. In the illustrated embodiment, the lower end pipe section 22 is a non-rotationally symmetrical pipe section, but the utility model is not limited thereto. The lower end pipe section 22 can also be a rotationally symmetrical pipe section, such as a cylindrical pipe section.

[0064] As described above, Figure 1 , Figure 2 and Figure 6 The blanking pipe shown in

[0065] The second aspect of the utility model is particularly suitable for a blanking pipe comprising rotationally symmetrical pipe sections. The rotationally symmetrical pipe sections are pipe sections that can be connected to adjacent pipe sections without changing the geometry of the blanking pipe, even if they are rotated by a certain angle relative to the adjacent pipe sections. The angle can be, but is not limited to, +90 degrees, +180 degrees, -90 degrees, +120 degrees, -120 degrees, etc. The rotationally symmetrical pipe sections are detachably connected to the adjacent pipe sections, and the circumferential mounting position can be adjusted relative to the adjacent pipe sections. The specific connection and adjustment method can be the technical means described above in connection with the first aspect of the utility model. For the sake of brevity, the description thereof is omitted.

[0065] If the degree of wear on the inner wall of the blanking pipe does not meet the further use requirements, and if the wear occurs in a rotationally symmetrical pipe section, the connection between the rotationally symmetrical pipe section and the adjacent pipe section can be detached, the rotationally symmetrical pipe section can be rotated by a certain angle, such as +90 degrees, +180 degrees, or -90 degrees, relative to the adjacent pipe section, so that the non-worn inner wall of the rotationally symmetrical pipe section occupies the position of the worn inner wall, and then the rotationally symmetrical pipe section and the adjacent pipe section are fixedly connected together. If the wear occurs in a non-rotationally symmetrical pipe section, the non-rotationally symmetrical pipe section can be detached and replaced with a new one.

[0066] By this way, for the rotationally symmetrical pipe section, theoretically, it can be rotated three times or more, so as to improve the wear resistance by at least three times; for the non-rotationally symmetrical pipe section, the replacement after wear is limited to a certain local pipe section. Therefore, by adopting the technical solution of 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.

[0067] The third aspect of the present application will be described below with reference to Figure 2 and Figure 6 . As shown in Figure 2 , in order to prevent the falling material in the downpipe from causing dust flying and polluting the environment during the operation of the material transfer device, a tunnel-type 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.

[0068] According to the third aspect of the present application, in addition to arranging the tunnel-type 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.

[0069] 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 coal flow speed, 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, under the condition that a certain degree of negative pressure is formed in the downpipe 2, part of the air in the dust cover internal space which is mixed with 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 material, thereby playing a dust suppression role to a certain extent.

[0070] 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 flared opening, 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 that the connecting hole 28 is arranged at a position away from 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.

[0071] The negative pressure self-dust-suppression air duct 7 can be used in combination with the drop tube according to the second aspect of the present application. In this case, if the connecting holes 28 on the drop tube are located on a rotationally symmetrical tube segment, such as the frustoconical tube segment 26, as shown in Figure 6 , a plurality of circumferentially spaced connecting holes can be provided on the frustoconical tube segment 26, Figure 6 The frustoconical tube segment 26 shown in the middle view is provided with four connecting holes. In this way, when the rotationally symmetrical tube segment is adjusted in circumferential installation position due to internal wear, the negative pressure self-dust-suppression air duct 7 can be connected with the connecting holes in the corresponding orientation. For the connecting holes 28 that are not used in operation, they can be plugged with a cover 29. As for the arrangement position of the connecting holes 28 in the height direction of the drop tube, the present application does not make a special limitation, and the middle position and the position above the middle position of the drop tube are more preferred. In addition, as a preferred solution, a filter screen can be provided at the communication port 71 on the dust cover and at the connecting holes 28 on the drop tube 2 to prevent coal cinder and the like from entering the negative pressure self-dust-suppression air duct 7.

[0072] As described above, the coal drop pipe includes a dosing mechanism arranged upstream of the drop tube, to selectively distribute the received material to one of the two drop tubes. The dosing mechanism according to the fourth aspect of the present application will be described below in combination with Figures 7-11 . As shown in Figure 7 and Figure 7A , the dosing mechanism 10 includes a flow guide pipe barrel 11, the upper end of the flow guide pipe barrel being a feed inlet 71, the lower end of the flow guide pipe barrel being a discharge outlet 72, and the upper part of the flow guide pipe barrel 11 being pivotally mounted on a support. The support can be embodied in various forms, such as a housing form enclosing the drop tube feed inlet 3 and the flow guide pipe barrel 11, and more commonly a tee 12 as shown in Figure 8 , Figure 9 and Figure 10 , Figure 11 . In the case of using the tee 12 as the support, as shown in Figure 9 , the tee 12 can include a feed port 31 and discharge ports 32 and 33, and the two discharge ports 32 and 33 are respectively connected in communication with the feed inlets 3 of the two drop tubes 2. In the technical solution of the present application, the support should be understood in a broad sense, which includes various fixed structures of the coal drop pipe.

[0073] As an example of the mounting manner of the flow guide pipe barrel 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 barrel 11 is arranged on the outer side of the upper part of the flow guide pipe barrel 11, and the pin shaft 13 constitutes a pivot shaft about which the flow guide pipe barrel 11 pivots, and a corresponding mounting hole 14 is formed in the support (i.e. the tee 12 in the embodiment) (see Figure 8), by which the draft tube cylinder 11 can be pivotally mounted on the support, so that the draft tube cylinder 11 can swing to both sides around the pivot, thus the draft tube cylinder 11 can be called a pendulum draft tube cylinder; as a preferred technical solution, the pin shaft 13 or the pivot shaft is mounted in the mounting hole of the support through a bearing.

[0074] In the embodiment, the dosing mechanism 10 is embodied in the form of the draft tube cylinder 11, but the specific geometry of the draft tube cylinder is not particularly limited in the present application, which can be a straight cylinder, such as the cylindrical shape shown in the figure, a polygonal cylinder with a polygonal cross section, etc., or a tapered cylinder, such as a conical cylinder, a polygonal conical cylinder with a polygonal cross section, etc., or a tube with an asymmetric cross section, etc., as long as it can smoothly distribute the received material to the two discharge pipes. The inlet and outlet of the draft tube cylinder can be of any shape, for example, the inlet is square and the outlet is circular, the inlet is oval and the outlet is circular, etc.; as a preferred solution, the cross section of the inlet is larger than that of the outlet.

[0075] In order to distribute the received material to one of the two discharge pipes, the draft tube 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 draft tube cylinder 11 is aligned with the inlet of one of the two discharge pipes; in the second working position, the outlet of the draft tube cylinder 11 is aligned with the inlet of the other of the two discharge pipes. Figure 7A and Figure 7B respectively show the draft tube cylinder 11 in two different working positions.

[0076] The driving device for driving the draft tube 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, etc., to make the driving rod 16 linearly extend and retract, 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 draft tube cylinder 11, which is preferably arranged parallel to the pivot shaft around which the draft tube cylinder 11 pivots.

[0077] Please refer to Figure 10 , which shows a form of the driving device. As shown in Figure 10As shown, the drive unit 15 is rotatably mounted on the mounting bracket 52 via a rotating shaft 51, and the mounting bracket 52 is fixedly mounted on the bracket. The front end of the drive rod 16 has a hinge hole, and the drive rod is hinged to the pin 17 of the guide tube 11 through the hinge hole. During operation, the drive unit drives the drive rod 16 to extend and retract, and the drive rod 16 drives the guide tube 11 to rotate through the pin 17, positioning it in the first working position or the second working position.

[0078] Please see Figure 11 The illustration shows another form of the drive mechanism. For example... Figure 11 As shown, the drive unit 15 is fixedly mounted on the mounting bracket 55. The front end of the drive rod has an elongated groove 53 extending in a direction perpendicular to the length of the rod. The pin 17 on the lower side of the guide tube 11 is inserted into the elongated groove 53 and connected to the drive rod. The pin 17 can move along the elongated groove 53. During operation, the drive unit drives the drive rod 16 to extend and retract. The drive rod 16 drives the guide tube 11 to rotate through the pin 17 and positions it in the first working position or the second working position.

[0079] To accommodate the pivotal rotation of the guide tube 11, an arc-shaped groove 20 is formed on the support, such as the tee 12, with the rotation center of the guide tube 11 as the center. Please refer to [link to relevant documentation]. Figure 8 , Figure 10 and Figure 11 In the assembled state, the pin 17 of the guide tube 11 passes through the arc-shaped groove and is connected to the drive rod 16.

[0080] In the fourth aspect of the present invention described above, the pin 13, which serves as a pivot, is located at the upper part of the guide tube 11, while the pin 17, which serves as a drive unit, is located at the lower part of the guide tube 11. The present invention is not limited to this, and other forms can be adopted. For example, the positions of pin 13 and pin 17 can be interchanged; in this case, the position of the drive device needs to be adjusted accordingly. Furthermore, pin 13 can be located at the middle of the guide tube 11, etc.

[0081] Regarding the fourth aspect of this utility model, its essence lies in the fact that the feeding mechanism adopts a pendulum-type design, switching between a first working position and a second position by swinging, thereby realizing the selective delivery of materials to the two feeding pipes. Regarding the driving device, this utility model does not impose any particular limitation; various driving devices existing in the art and well-known to those skilled in the art for driving the pivot rotation of a component can be used. Regarding the arc-shaped groove, other forms can also be used, such as a rectangular opening formed on the support, etc., as long as it does not interfere with the movement of the pin 17.

[0082] In the shown embodiment, the drive device is arranged outside the support or housing, but the application is not limited thereto. As an alternative, the drive device can also be arranged inside the support or housing, in which case the arcuate slot or the like for allowing the movement of the pin shaft 17 can also be omitted. Furthermore, in the shown embodiment, the tee 12 is used as a support base for the pin shaft 13, the mounting support 52, 55 and the like, but according to the application, the tee can also be omitted, in which case the components such as the pin shaft 13, the mounting support 52, 55 and the like, which are supported by the tee, can be supported on other parts of the support, such as the following pipe, as a support base.

[0083] As described above with respect to the second aspect of the application, the rapidly falling material will impact and rub against the wall of the discharge pipe, thereby causing damage and wear to the wall at that location. Similarly, when receiving the material from upstream, the inner wall of the flow guide cylinder 11 will also be impacted and rubbed by the material, and the flow guide cylinder will need to be replaced after long-term use, thereby increasing the cost of the equipment and prolonging the downtime. Therefore, as a preferred solution, the flow guide cylinder 11 adopts a rotational symmetry structure, which means that the flow guide cylinder 11 can still be used with adjacent structures after rotating by a certain angle (i.e., adjusting along the circumference), which includes but is not limited to +90 degrees, +180 degrees, -90 degrees, +120 degrees or -120 degrees, and the like. After rotating by the angle, the non-worn inner wall of the flow guide cylinder occupies the position of the inner wall that has been worn after a period of use. In addition, in the case of the flow guide cylinder 11 adopting a rotational symmetry structure, the corresponding structure needs to be added at the position of the corresponding rotation angle of the flow guide cylinder 11 according to the specific structure of the drive device used, such as the pin shaft 13, the pin shaft 17 and the like in the case of using the drive device shown in Figure 10 and Figure 11 .

[0084] In the case of forming an arcuate slot 20 with the center of the flow guide cylinder 11 as the center on the support such as the tee 12, please refer to Figure 8 , Figure 10 and Figure 11 , the coal in the support such as the tee 12 can leak out of the arcuate slot 20, or the coal can be stuck in the arcuate slot and interfere with the operation of the drive device. Therefore, as a preferred solution, a sealing structure can be provided to block the arcuate slot. Please refer to Figure 12 , which illustrates one form of the sealing structure, as Figure 12As shown, the sealing structure comprises an arc-shaped plate strip 80 connected with the pin shaft 13 and rotating together with the pin shaft 13, the arc-shaped plate strip 80 is a plate strip with the rotation center of the flow guide pipe cylinder 11 as the center, the arc-shaped plate strip 80 extends from both sides of the pin shaft 17 in the connected state, and always covers the arc-shaped groove 20, regardless of the position of the pin shaft 17 in the arc-shaped groove. In order to ensure the sealing effect, as a preferred technical solution, an arc-shaped guide groove 81 can be arranged along the arc-shaped groove 20, the arc-shaped plate strip 80 is inserted into the arc-shaped guide groove 81 from one end of the arc-shaped guide groove 81, the inner plate surface of the arc-shaped plate strip 80 abuts against the outer wall of the tee joint 12, and the outer plate surface abuts against the inner wall of the arc-shaped guide groove 81, so as to ensure the sealing effect of the arc-shaped plate strip 80. In the case where the arc-shaped guide groove 81 is not arranged, the arc-shaped plate strip 80 is fixedly connected with the pin shaft 17; in the case where the arc-shaped guide groove 81 is arranged, the arc-shaped plate strip 80 can be fixedly connected with the pin shaft 17 or rotatably connected with the pin shaft 17.

[0085] As a preferred technical solution, an arc-shaped guide plate 36 can be arranged at the feed inlet of the coal falling pipe, and the open surface of the arc-shaped guide plate 36 faces the upstream distributed material, so as to guide the material into the flow guide pipe cylinder 11. Figure 7 and Figure 9 As shown, the material conveying belt machine 1 conveys the material to the feed inlet 37, the material leaving the material conveying belt machine 1 collides on the arc-shaped guide plate 36, and then flows downwards along the arc-shaped guide plate into the flow guide pipe cylinder 11. The guide plate shown in the figure is arc-shaped, but the utility model is not limited thereto, and the guide plate can adopt any other structure with a groove-shaped cross section, and the baffle or wing plate on both sides of the guide plate has a flow regulating effect to prevent the coal flow from scattering to both sides. As a preferred solution, the guide plate is gradually folded from top to bottom, that is, the cross section is gradually reduced, so as to achieve the effects of gathering and flow regulating.

[0086] As shown in Figure 7 , Figure 9 and Figure 9A As a preferred technical solution, the arc-shaped guide plate 36 is pivotally installed on the support and can rotate around the pivot, so as to adjust the position of the arc-shaped guide plate 36 relative to the flow guide pipe cylinder 11 and / or the material conveying belt machine 1, and then facilitate the conveying of the coal flow. For this purpose, as shown in Figure 7 , Figure 9 and Figure 9AAs shown, a plurality of axially spaced lugs 39 are arranged on the back ridge of the arc-shaped 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 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 guide plate 36 is adjusted according to whether the guide pipe cylinder 11 is in the first working position or the second working position, and after adjustment, it can be locked by, for example, a locking nut. In addition, the arc-shaped 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 guide pipe cylinder 11 can be used to rotate the arc-shaped guide plate 36, and the description thereof is omitted here.

[0087] Although it is a preferred scheme to arrange the guide plate at the inlet of the coal drop pipe, the guide plate can also be omitted. In addition, as a modification scheme, the batching mechanism 10 can include both the guide pipe cylinder 11 and the arc-shaped guide plate 36, that is, the arc-shaped guide plate is a component of the batching mechanism 10 and extends upward along the guide pipe cylinder, and the guide pipe cylinder and the arc-shaped guide plate are fixedly connected or integrally formed. In addition, as shown in Figure 1 and Figure 9 As shown, the coal drop pipe is provided with a housing 50 at the inlet 37, and as a modification scheme, the housing 50 can also be omitted.

[0088] In the above part of the application, the technical schemes of the first aspect to the fourth aspect of the present application are described respectively, and the contents of these aspects can constitute a technical scheme alone, or two aspects, three aspects or four aspects among them can be combined to constitute a corresponding combined technical scheme.

[0089] The present application has been described above with reference to the specific embodiments in conjunction with the drawings, but this is only for the purpose of illustration, and the present application is not limited thereto. Therefore, it is obvious to those skilled in the art that various changes and modifications can be made within the technical spirit and scope of the present application, and these changes and modifications should also be understood as belonging to the category of the present application, and the scope of the present application is defined by the claimed technical scheme and its equivalent schemes.

Claims

1. A coal drop pipe comprising a distributing mechanism and two drop pipes, each of the drop pipes comprising an inlet at an upper end and an outlet at a lower end, the inlet being arranged to receive material distributed by the distributing mechanism, the material flowing through the drop pipe and being discharged through the outlet, the inlets of the two drop pipes being adjacent to each other; characterized in that the distributing mechanism is arranged upstream of the two drop pipes to receive material and selectively distribute the received material to one of the two drop pipes; the distributing mechanism comprising a flow guide cylinder, the flow guide cylinder having an inlet at an upper end and an outlet at a lower end; the distributing mechanism being pivotally mounted on a support and arranged to pivot about a pivot axis between a first working position and a second working position under the drive of a drive device, in the first working position the outlet of the flow guide cylinder being aligned with the inlet of one of the two drop pipes, in the second working position the outlet of the flow guide cylinder being aligned with the inlet of the other of the two drop pipes.

2. The flow guide cylinder is a straight cylinder or a tapered cylinder.

3. The pivot axis about which the distributing mechanism pivots is located at an upper portion of the flow guide cylinder.

2. A drop chute as claimed in claim 1 wherein, 4. An outer side of the upper portion of the flow guide cylinder is provided with two first pin shafts coaxial with and extending away from an outer wall of the flow guide cylinder, the two first pin shafts constituting the pivot axis, the support being provided with mounting holes, the first pin shafts being fitted in the mounting holes.

3. The drop chute of claim 1 wherein, 5. The coal drop pipe comprises a tee, the tee comprising an inlet port and two outlet ports, the two outlet ports being respectively connected in communication with the inlets of the two drop pipes; the flow guide cylinder being located in the tee, the tee constituting the support.

4. A drop chute as claimed in claim 3 wherein, 6. The drive device comprises a linearly telescopic drive rod, the drive device being rotatably mounted on the support via a rotating shaft, a front end of the drive rod being formed with a hinged hole, the flow guide cylinder being provided with a second pin shaft parallel to and spaced apart from the pivot axis of the distributing mechanism, the drive rod being hinged with the second pin shaft via the hinged hole.

5. A drop chute according to any one of claims 1-4, characterized in that 7. The drive device comprises a linearly telescopic drive rod, the drive device being fixedly mounted on the support, a front end of the drive rod being formed with a long slot extending in a direction perpendicular to a length direction of the drive rod, the flow guide cylinder being provided with a second pin shaft parallel to and spaced apart from the pivot axis of the distributing mechanism, the second pin shaft being inserted into the long slot to connect with the drive rod.

6. The drop chute of claim 1 wherein, 8. The drive device comprises a pneumatic drive device, a hydraulic drive device, an electro-hydraulic drive device or an electric drive device.

7. The drop chute of claim 1 wherein, 9. The coal drop pipe further comprises a slot-shaped flow guide plate, an open side of the slot-shaped flow guide plate facing the material distributed upstream to guide the material into the flow guide cylinder.

8. A drop chute according to claim 6 or 7, characterised in that, 10. The slot-shaped flow guide plate is gradually reduced in cross section from top to bottom.

9. The drop chute of claim 1 wherein, 11. The slot-shaped flow guide plate is an arc-shaped flow guide plate.

10. A drop chute as claimed in claim 9, wherein, 12. The slot-shaped flow guide plate is pivotally mounted on the support and rotatable about a rotating shaft parallel to the pivot axis to adjust a working position relative to the flow guide cylinder.

11. A drop chute according to claim 9 or 10 wherein, 13. The slot-shaped flow guide plate is fixedly connected with the flow guide cylinder or integrally formed with the flow guide cylinder and extends upward from the inlet of the flow guide cylinder, the slot-shaped flow guide plate and the flow guide cylinder constituting the distributing mechanism.

12. A drop chute according to claim 9 or 10 wherein, ​ 13. A drop chute according to claim 9 or 10 wherein, ​ 14. The drop chute of claim 1 wherein, The cross section of the inlet of the draft tube is larger than the cross section of the outlet of the draft tube.

15. A drop chute as defined in claim 4 wherein, The first pin shaft is fitted in the mounting hole through a bearing.

16. The drop chute of claim 1 wherein, The draft tube adopts a rotational symmetry structure, and the circumferential installation position of the draft tube can be adjusted along the circumference, so that the non-worn inner wall of the draft tube occupies the position of the inner wall worn after a period of use.

17. A drop chute as claimed in claim 16 wherein, The angle of the circumferential installation position of the draft tube adjusted along the circumference includes +90 degrees, +180 degrees, -90 degrees, +120 degrees or -120.

18. A drop chute according to claim 6 or 7 wherein, An arc-shaped slot with the pivot shaft as the center is formed on the bracket, and the pin shaft passes through the arc-shaped slot and is connected with the driving rod.

19. A drop chute as claimed in claim 18, wherein, The bracket is a three-way.

20. The drop chute of claim 18, wherein, The coal drop pipe comprises a sealing structure for blocking the arc-shaped slot.

21. A drop chute as claimed in claim 20, wherein, The sealing structure comprises an arc-shaped plate strip connected with the pin shaft and rotating together with the pin shaft, the arc-shaped plate strip is a plate strip with the pivot shaft as the center, and in the connected state with the pin shaft, the arc-shaped plate strip extends from both sides of the pin shaft and always covers the arc-shaped slot, and the arc-shaped plate strip is fixedly connected with the pin shaft.

22. A drop chute as claimed in claim 21 wherein, The sealing structure comprises an arc-shaped plate strip connected with the pin shaft and rotating together with the pin shaft, the arc-shaped plate strip is a plate strip with the pivot shaft as the center, and in the connected state with the pin shaft, the arc-shaped plate strip extends from both sides of the pin shaft and always covers the arc-shaped slot; an arc-shaped guide groove is arranged along the arc-shaped slot, the arc-shaped plate strip is inserted into the arc-shaped guide groove from one end of the arc-shaped guide groove, so that the inner plate surface of the arc-shaped plate strip abuts against the outer wall of the bracket, and the outer plate surface of the arc-shaped plate strip abuts against the inner wall of the arc-shaped guide groove; and the arc-shaped plate strip is fixedly connected or rotatably connected with the pin shaft.

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