Coal drop pipe and material distribution method of coal drop pipe

Abstract

The invention discloses a coal dropping pipe and a material distribution method of the coal dropping pipe, the coal dropping pipe comprises a batching mechanism and two blanking pipes, each blanking pipe comprises a feed port and a discharge port, the feed port is used for receiving materials distributed by the batching mechanism, the materials flow through the blanking pipes and are discharged through the discharge port, and the feed ports of the two blanking 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 present invention relates to the technical field of material distribution, and in particular to a coal dropping pipe and a material distribution method for the coal dropping pipe. Background Art

[0002] The coal drop pipe is one of the main devices of the coal transfer station of a thermal power plant, and usually includes two drop pipes, the drop pipes include a feed port at the upper end and a discharge port at the lower end; the coal drop pipe also includes a coal distribution mechanism, which is configured to selectively distribute the material received from the upstream to one of the two drop pipes. CN219751262U discloses a coal distribution mechanism, including a receiving pipe in the form of a tee, the two discharge ports of the receiving pipe are respectively connected to the feed port of the drop pipe; the receiving pipe is provided with a left guide rail and a right guide rail on both sides corresponding to the left and right discharge ports, respectively, the left slide along the left guide rail blocks the feed port of the left drop pipe, and the right slide along the right guide rail blocks the feed port of the right drop pipe, and the left slide and the right slide are used as gate doors. During operation, when the left slide is in the open position and the right slide is in the closed position, the downpipe on the left receives the material received by the coal drop pipe and transports the material downstream; similarly, when the right slide is in the open position and the left slide is in the closed position, the downpipe on the right receives the material received by the coal drop pipe and transports the material downstream.

[0003] The above-mentioned traditional coal drop pipe has a complex structure and is prone to blockage during coal material transportation. In addition, due to the use of a slide rail structure, coal slag is easily adhered to the rail, which blocks or hinders the movement of the slide. Therefore, there is a demand in the industry for a coal drop pipe with further improved material transportation and distribution performance. Summary of the invention

[0004] The present invention aims to overcome the defects of the conventional technology and aims to provide a coal dropping pipe which has a simple structure, low cost, reliable operation and can ensure smooth transportation of materials.

[0005] To achieve the above-mentioned purpose, according to the present invention, a coal dropping pipe is provided, comprising a batching mechanism and two feeding pipes, each of the feeding pipes comprising a feeding port at an upper end and a discharging port at a lower end, the feeding port is used to receive the material distributed by the batching mechanism, the material flows through the feeding pipe and is delivered through the discharging port, and the feeding ports of the two feeding pipes are adjacent to each other; characterized in that,

[0006] The batching mechanism is arranged upstream of the two feeding pipes to receive materials and selectively distribute the received materials to one of the two feeding pipes; the batching mechanism includes a flow guide tube, the upper end of the flow guide tube is a feed port, and the lower end of the flow guide tube is a discharge port;

[0007] The dosing mechanism is pivotally mounted on a bracket and is configured to swing around a pivot axis between a first working position and a second working position under the drive of a driving device. In the first working position, the discharge port of the flow guide tube is aligned with the feed port of one of the two discharge tubes; in the second working position, the discharge port of the flow guide tube is aligned with the feed port of the other of the two discharge tubes.

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

[0009] Preferably, the pivot axis around which the dosing mechanism swings is located at the upper portion of the flow guide tube.

[0010] Preferably, two first pins are coaxially arranged on the outer side of the upper portion of the guide tube and extend away from the outer wall of the guide tube, the two first pins constitute the pivot axis, and a mounting hole is provided on the bracket, and the first pins are mounted in the mounting hole.

[0011] Preferably, the coal drop pipe comprises a tee, the tee comprises a feed port and two discharge ports, the two discharge ports are respectively connected to the feed ports of the two drop pipes; the guide tube is located in the tee, and the tee constitutes the bracket.

[0012] Preferably, the driving device includes a driving rod with linear telescopic motion, the driving device is rotatably mounted on the bracket through a rotating shaft, a hinge hole is formed at the front end of the driving rod, a second pin shaft parallel to the pivot axis of the batching mechanism and spaced apart from the pivot axis up and down is provided on the flow guide tube, and the driving rod is hinged to the second pin shaft through the hinge hole.

[0013] Preferably, the driving device includes a driving rod with linear telescopic movement, the driving device is fixedly mounted on a bracket, a long groove extending in a direction perpendicular to the long direction of the driving rod is formed at the front end of the driving rod, and a second pin shaft parallel to the pivot axis of the batching mechanism and spaced apart from the pivot axis up and down is provided on the flow guide tube, the second pin shaft is inserted in the long groove and connected to the driving rod.

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

[0015] Preferably, the coal drop pipe further comprises a groove-shaped guide plate, the open side of which faces the material distributed upstream, so as to guide the material into the guide tube.

[0016] Preferably, the cross-section of the groove-shaped guide plate gradually decreases from top to bottom.

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

[0018] Preferably, the groove-shaped guide plate is pivotally mounted on a bracket and can be rotated around a rotation axis parallel to the pivot axis to adjust a working position relative to the guide tube.

[0019] Preferably, the grooved guide plate is fixedly connected to the guide tube or formed integrally with the guide tube, and extends upward from the feed port of the guide tube. The grooved guide plate and the guide tube constitute the batching mechanism.

[0020] Preferably, the cross-section of the feed opening of the flow guide tube is larger than the cross-section of the discharge opening of the flow guide tube.

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

[0022] Preferably, the guide tube adopts a rotationally symmetrical structure, and its circumferential installation position can be adjusted along the circumference, so that the non-wear inner wall of the guide tube occupies the position of the inner wall that is worn after a period of use.

[0023] Preferably, the circumferential installation position of the flow guide tube is adjusted at an angle of +90 degrees, +180 degrees, -90 degrees, +120 degrees or -120 degrees.

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

[0025] Preferably, the bracket is a tee.

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

[0027] Preferably, the sealing structure includes an arc-shaped slat connected to the pin shaft and rotating therewith, the arc-shaped slat is a slat with the pivot axis as the center, and when connected to the pin shaft, the arc-shaped slat extends from both sides of the pin shaft and always covers the arc-shaped groove, and the arc-shaped slat is fixedly connected to the pin shaft.

[0028] Preferably, the sealing structure includes an arc-shaped slat connected to the pin shaft and rotating therewith, the arc-shaped slat being a slat with the pivot axis as the center, and extending from both sides of the pin shaft and always covering the arc-shaped groove when connected to the pin shaft; an arc-shaped guide groove is provided along the arc-shaped groove, and the arc-shaped slat is inserted into the arc-shaped guide groove from one end thereof, so that the inner plate surface of the arc-shaped slat is against the outer wall of the bracket, and the outer plate surface of the arc-shaped slat abuts against the inner wall of the arc-shaped guide groove; the arc-shaped slat is fixedly connected or rotationally connected to the pin shaft.

[0029] According to another aspect of the present invention, a material distribution method of a coal drop pipe is provided, wherein the coal drop pipe comprises a batching mechanism and two feed pipes, each of the feed pipes comprises a feed port at an upper end and a feed port at a lower end, the feed port is used to receive the material distributed by the batching mechanism, the material flows through the feed pipe and is delivered through the feed port, and the feed ports of the two feed pipes are adjacent to each other;

[0030] The batching mechanism is arranged upstream of the feed pipe, and comprises a flow guide tube, the upper end of the flow guide tube is a feed inlet, and the lower end of the flow guide tube is a discharge outlet;

[0031] The batching mechanism is pivotally mounted on a bracket and can swing between a first working position and a second working position. In the first working position, the discharge port of the flow guide tube is aligned with the feed port of one of the two discharge tubes; in the second working position, the discharge port of the flow guide tube is aligned with the feed port of the other of the two discharge tubes. The method comprises:

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

[0033] The material transmitted from the upstream is received through the feed opening of the guide tube and the received material is transmitted through the discharge opening of the guide tube to the down pipe whose feed opening is aligned with the discharge opening of the guide tube.

[0034] By adopting the technical solution of the present invention, by adopting a batching mechanism that can swing between a first working position and a second working position, not only can accurate material distribution be achieved, but also the structure is simple, the cost is low, the operation is reliable, and the coal blockage during the operation of the coal drop pipe is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

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

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

[0038] Figure 3 is a partial perspective view, illustrating the lower end pipe section of the feed pipe that is matched with the main pipe section;

[0039] Figure 4 is a perspective view of the lower end pipe section of the feed pipe;

[0040] Figure 5 is similar to Figure 3 , illustrating the lower end pipe section of the feed pipe matched with the main pipe section from another angle;

[0041] Figure 6 It is a perspective view of the main pipe sections of two feed pipes;

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

[0043] Fig. 7A It is a partial plan view, illustrating the batching mechanism in a working position;

[0044] Figure 7B It is a partial plan view showing the batching mechanism in another working position

[0045] Figure 8 is a partial plan view illustrating a driving device of a batching mechanism;

[0046] Fig. 9 is a partial perspective view, illustrating the batching mechanism and its driving device and the arc-shaped guide plate;

[0047] Fig.9A yes Fig. 9 A top view of the local structure shown;

[0048] Fig.10 is a partial perspective view illustrating a structure of a driving device of a batching mechanism;

[0049] Fig.11 is a partial perspective view illustrating another structure of the driving device of the batching mechanism; and

[0050] Fig.12 It is a partial perspective view showing the sealing structure for blocking the arc groove. DETAILED DESCRIPTION

[0051] The material transfer device of the present invention is described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that the embodiments of the present invention are merely illustrative and are only used to illustrate the principles of the present invention rather than to limit the present invention.

[0052] See first Figure 1 and Figure 2 , which illustrates the overall structure of the material transfer device according to the present invention in the form of a perspective view, wherein the material is not limited to coal, etc. Figure 1 and Figure 2As shown, the material transfer device includes a material conveying belt conveyor 1, a coal dropping pipe 70, and a conveying belt conveyor 90. The coal dropping pipe 70 is used to receive materials transported by the material conveying belt conveyor 1 and other material conveying mechanisms, and to transport the received materials to a downstream device, such as the conveying belt conveyor 90. The coal dropping pipe 70 includes two material dropping pipes 2, and the material dropping pipe 2 includes a feed port 3 at the upper end and a discharge port 4 at the lower end; the batching mechanism 10 (see Figure 7 ), is arranged upstream of the feed pipe, and is used to selectively distribute the received material to one of the two feed pipes. The material flowing out of the feed pipe outlet 4 falls onto the belt of the conveyor belt conveyor 90, and is sent downstream by the conveyor belt conveyor 90.

[0053] See also Figure 1 and Figure 2 According to the present invention, as a preferred technical solution, the lower end pipe section 22 of the feed pipe is in the form of a curved pipe, which is curved toward the traveling direction of the upper belt section of the conveyor belt conveyor 90. The curved pipe can be a single-section curved pipe or a curved pipe composed of multiple sections, such as Figure 3-Figure 5 As 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 can be selected in any suitable shape according to the actual application. By adopting a curved elbow, on the one hand, the falling coal flow will impact the elbow section before flowing out from the discharge port of the lower pipe, so that the elbow section can buffer the coal flow; on the other hand, the flow direction of the material flowing out of the discharge port of the lower pipe forms an acute angle with the traveling direction of the upper belt section, thereby reducing the impact of the material on the belt. Compared with the situation where the material flowing out of the discharge port of the lower 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 the influence of various factors, such as 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 guide plate 36 set at the feed inlet of the coal drop pipe (if a guide plate is set, see Fig. 9 ), etc., when the coal drop pipe is assembled and put into use, the main stream of materials flowing out of the discharge port of the drop pipe may not necessarily fall to the middle position of the belt of the conveyor belt conveyor 90, which will have a serious impact on the transportation of materials.

[0055] In order to avoid the above situation, according to the first aspect of the present invention, 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, which 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 circumferential direction, thereby forming a coal drop pipe with 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 discharge port of the feed pipe can be adjusted, thereby ensuring that the main stream of materials flowing out of the discharge port of the feed pipe falls to the middle position of the belt, thereby ensuring the smooth transportation of materials.

[0056] For this reason, Figure 3-Figure 5 in particular Figure 4 As shown, 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 shown in Figure 5 As shown, the main pipe section 21 ( Figure 3-Figure 5 The lower end of the pipe section 22 (only a part of the main pipe section is shown in the figure) is provided with a flange 211, and a connection hole 212 is formed on the flange 211, so that the lower end pipe section and the main pipe section can be detachably connected through the connection holes 222, 212 on the flanges 221, 211 and bolts and nuts. In order to facilitate the circumferential adjustment of the lower end pipe section 22 relative to the main pipe section 21, connection holes evenly spaced along the circumferential direction can be formed on the flange 221 and the flange 211, respectively, and the number of connection holes on one of the two flanges is set to be a multiple relationship with the number of connection holes on the other flange, such as 1 times, 2 times, 3 times, etc. For example, 12 connection holes are formed on the flange 221, and 12, 24 or 36 connection holes can be formed on the flange 211, etc. In this case, the minimum angle of circumferential adjustment of the lower end pipe section 22 relative to the main pipe section 21 corresponds to the spacing angle between the connecting holes on the flange with a larger number of connecting holes, thereby the minimum angle of circumferential adjustment of the lower end pipe section can be controlled by controlling the circumferential spacing angle between the connecting holes on the flange.

[0057] It should be pointed out that, although it is a preferred solution that the connection holes on the flange 221 and the flange 211 are evenly spaced along the circumference, this is not necessary. Instead, a variety of other means can be adopted to achieve the detachable connection between the main pipe section 21 and the lower end pipe section 22, as well as the adjustment of the circumferential installation position of the lower end pipe section relative to the main pipe section. For example, a long arc hole can be formed on the flange 221 every 120 degrees, and the circumferential span of the arc hole can be, for example, 20 degrees; and a group of, for example, 3 circular holes corresponding to one of the long arc holes are formed on the flange 211 every 120 degrees. In the actual connection process, as long as at least one of the three circular holes is within the range of the long 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 achieved.

[0058] As a preferred technical solution, Figure 4 As shown, the connecting holes on the flange 221 of the lower end pipe section 22 and / or the flange 211 of the feed pipe main body section 21 are formed as waist holes. Therefore, in addition to adjusting the circumferential installation position of the lower end pipe section by circumferential displacement of the connecting holes, the circumferential installation position can also be fine-tuned with the aid of the waist holes, so that the lower end pipe section 22 can achieve more precise adjustment of the circumferential installation position.

[0059] In the above-described solution, the main pipe section and the lower end pipe section are detachably connected and circumferentially adjustable through the connection holes on their respective flanges and bolts and nuts. The present invention is not limited thereto, but may adopt a variety of other solutions. For example, an inner sleeve may be provided at the lower end of the main pipe section, and an outer sleeve may be formed at the upper end of the lower end pipe section. When connecting, the inner sleeve at the lower end of the main pipe section is inserted into the outer sleeve at the upper end of the lower end pipe section, and then the main pipe section and the lower end pipe section are clamped with a clamp at the connection portion, which may also achieve the same purpose.

[0060] During the operation of the coal drop pipe, the material is distributed to one of the two drop pipes through the batching mechanism, and is transported to the belt of the conveyor belt conveyor 90 through the drop pipe. During the transportation of the material through the drop pipe, the material usually does not fill the entire drop pipe (here refers to the cross section). Usually, it only occupies 1 / 3-1 / 4 of the cross section of the drop pipe. The fast-falling material will impact a specific part of the drop pipe wall, that is, the lower wall of the drop pipe relative to the gravity direction, and produce friction with the pipe wall, thereby causing damage and wear to the pipe wall at this part. In the case of an integral structure drop pipe, after the damage and wear of the pipe wall reaches a certain degree, the entire drop pipe needs to be replaced, which greatly increases the equipment cost and prolongs the downtime.

[0061] In order to overcome this defect, according to the second aspect of the present invention, Figure 2 and Figure 6 As shown, the provided feed pipe 2 is in the form of multiple sections (i.e., two sections or more), that is, the feed pipe 2 includes multiple pipe sections, thereby forming a multi-section coal dropping pipe. The feed pipe 2 shown in the figure includes four pipe sections, namely, a square section pipe section 25, a truncated cone pipe section 26, a cylindrical pipe section 27 and a lower end pipe section 22. Adjacent pipe sections of the multiple pipe sections are detachably connected. The specific connection method can adopt the technical means described above in combination with the first aspect of the present invention, and its description is omitted for the sake of brevity. In the specification of this application and other parts, the multiple pipe sections include two pipe sections and more than two pipe sections.

[0062] The technical solution according to the second aspect of the present invention is particularly suitable for a feed pipe including a rotationally symmetrical pipe segment. The rotationally symmetrical pipe segment referred to in this application refers to a pipe segment that can still be connected to an adjacent pipe segment by a certain circumferential rotation relative to the adjacent pipe segment without changing the geometric shape of the feed pipe. The angle includes but is not limited to +90 degrees, +180 degrees, -90 degrees +120 degrees or -120 degrees, etc. The rotationally symmetrical pipe segment is detachably connected to the adjacent pipe segment, and the circumferential installation position can be adjusted relative to the adjacent pipe segment. The specific connection and adjustment method can adopt the technical means described above in combination with the first aspect of the present invention, and its description is omitted for the sake of brevity.

[0063] exist Figure 2 and Figure 6 Among the pipe sections of the feed pipe shown in , the square-circle section 25, the truncated cone section 26 and the circular section 27 are rotationally symmetrical sections. For the square-circle section 25, it can rotate at an angle of +90 degrees, +180 degrees or -90 degrees relative to the adjacent section, and can still be connected to the adjacent section, i.e., the conical section 26, without changing the geometric shape of the feed pipe; for the truncated cone section 26 and the circular section 27, they can rotate at any angle relative to the adjacent section, and can still be connected to the adjacent section without changing the geometric shape of the feed pipe. In the illustrated embodiment, the lower end section 22 is a non-rotationally symmetrical section, but the present invention is not limited thereto, and the lower end section 22 can also be a rotationally symmetrical section, such as a cylindrical section.

[0064] As mentioned above, Figure 1 , Figure 2 and Figure 6 The feed pipe shown in the figure includes three rotationally symmetrical pipe sections, namely the square-circular section 25, the truncated cone section 26 and the circular section 27, but this is only an example. The feed pipe of the present invention can be divided in other forms. For example, the square-circular section 25 and the truncated cone section 26 can be combined into a rotationally symmetrical section, or the truncated cone section 26 and the circular section 27 can be combined into a rotationally symmetrical section, or the square-circular section 25, the truncated cone section 26 and the circular section 27 can be combined into a rotationally symmetrical section; in addition, the feed pipe can also be divided into more than three rotationally symmetrical sections.

[0065] By adopting the technical solution according to the second aspect of the present invention, when the wear degree of the inner wall of the discharge pipe 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, and the rotationally symmetrical pipe segment can be rotated circumferentially relative to the adjacent pipe segment by a certain angle such as +90 degrees, +180 degrees or -90 degrees, etc., so that the non-worn inner wall of the rotationally symmetrical pipe segment occupies the position of the worn inner wall, and then is fixedly connected with the adjacent pipe segment; if the wear occurs in the non-rotationally symmetrical pipe segment, the non-rotationally symmetrical pipe segment can be removed and replaced with a new one.

[0066] In this way, for a rotationally symmetrical pipe section, theoretically, it can be rotated three times or more, thereby at least three times improving the anti-wear effect; for a non-rotationally symmetrical pipe section, replacement after wear is limited to a certain local pipe section. Therefore, the technical solution of the second aspect of the present invention can greatly reduce costs, improve maintenance efficiency and reduce downtime.

[0067] See below Figure 2 and Figure 6 , describes the technical solution according to the third aspect of the present invention. Figure 2 As shown, in order to prevent the falling material in the discharge pipe from causing dust to fly and pollute the environment during the operation of the material transfer device, a tunnel-type dust cover 6 is usually provided on the belt of the transmission belt conveyor 90. In addition, various types of dust removal devices known to those skilled in the art may also be provided in the dust cover 6.

[0068] According to the technical solution of the third aspect of the present invention, in addition to providing a tunnel-type dust cover 6 on the belt of the conveyor belt conveyor 90, in order to further improve the dust removal effect, a negative pressure self-dust suppression air duct 7 is provided between the feed pipe 2 and the dust cover 6, and the negative pressure self-dust suppression air duct 7 connects the internal space enclosed by the dust cover with the internal space of the feed pipe 2. For this purpose, Figure 2 As shown, one end of the negative pressure self-dust suppression air duct 7 is connected to the connecting port 71 formed on the dust cover, and the other end is connected to the connecting hole 28 on the discharge pipe 2.

[0069] As described above, during the operation of the coal drop pipe, the material flows rapidly from top to bottom through the feed pipe. Due to the very fast coal flow speed, a certain degree of negative pressure is formed in the feed pipe. Since the internal space enclosed by the dust cover 6 and the internal space of the feed pipe 2 are interconnected through the negative pressure self-dust suppression air duct 7, when a certain degree of negative pressure is formed in the feed pipe 2, part of the air mixed with dust in the internal space of the dust cover will enter the feed pipe through the negative pressure self-dust suppression air duct 7. After entering the feed pipe, the dust entrained in the air is adsorbed on the moving coal, 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 duct 7 connected to the dust cover is in a bell-mouth shape, such as Figure 2 As shown, the suction effect can be appropriately enhanced. When the material flows rapidly from top to bottom through the feed pipe, it basically flows along the lower wall of the feed pipe relative to the gravity direction. It is a preferred solution to set the connection hole 28 at a position away from the coal flow. For this reason, the connection hole 28 on the feed pipe for connecting the negative pressure self-dust suppression air duct can be set at a position appropriately away from the lower wall of the feed pipe.

[0071] The negative pressure self-dust suppression air duct 7 can be used in combination with the feed pipe according to the second aspect of the present invention. In this case, if the connection hole 28 on the feed pipe is located on a rotationally symmetrical pipe section, such as a truncated cone-shaped pipe section 26, Figure 6 As shown, a plurality of circumferentially spaced connection holes may be provided on the truncated cone-shaped pipe section 26. Figure 6 The truncated cone-shaped pipe section 26 shown in the figure is provided with four connecting holes. Therefore, when the rotationally symmetrical pipe section adjusts the circumferential installation position due to internal wear, the negative pressure self-dust suppression air duct 7 can be connected to the connecting holes in the corresponding orientation. For the connecting holes 28 that are not used during operation, they can be blocked with a cover 29. Regarding the setting position of the connecting hole 28 along the height direction of the discharge pipe, the present invention does not make any special limitation, and the middle position of the discharge pipe and the position slightly above the middle are more preferred. In addition, as a preferred scheme, a filter net can be provided at the connecting port 71 on the dust cover and the connecting hole 28 on the discharge pipe 2 to prevent coal slag and the like from entering the negative pressure self-dust suppression air duct 7.

[0072] As mentioned above, the coal drop pipe includes a distribution mechanism arranged upstream of the feed pipe for selectively distributing the received material to one of the two feed pipes. Figure 7-Figure 11 The dispensing mechanism according to the fourth aspect of the present invention is described below. Figure 7 and Fig. 7A As shown, the batching mechanism 10 includes a guide tube 11, the upper end of the guide tube is a feed port 71, the lower end of the guide tube is a discharge port 72, and the upper pivot of the guide tube 11 is mounted on a bracket. The bracket can be embodied in various forms, such as a shell form that encloses the feed port 3 of the feed tube and the guide tube 11. The more common one is Figure 8 , Fig. 9 as well as Fig.10 , Fig.11 In the case where the tee 12 is used as a bracket, as shown in Fig. 9 As shown, the tee 12 may include a feed port 31 and discharge ports 32 and 33, and the two discharge ports 32 and 33 are respectively connected to the feed ports 3 of the two feed pipes 2. In the technical solution of the present invention, the support should be understood in a broad sense, including various fixed structures of the coal drop pipe.

[0073] As an example of how the guide tube 11 is installed on the bracket, Figure 7 , Figure 8 and Fig. 9 As shown, a pin 13 is coaxially arranged on the outer side of the upper portion of the flow guide tube 11 and extends away from the outer wall of the flow guide tube 11. The pin 13 constitutes a pivot axis around which the flow guide tube 11 pivots, and a corresponding mounting hole 14 is opened on the bracket (i.e., the tee 12 in the embodiment) (see Figure 8), whereby the guide tube 11 can be pivotally mounted on the bracket, so that the guide tube 11 can swing to both sides around the pivot axis, so the guide tube 11 can be called a pendulum guide tube; as a preferred technical solution, the pin shaft 13 or the pivot shaft is installed in the mounting hole of the bracket through a bearing.

[0074] In the described embodiment, the batching mechanism 10 is specifically embodied in the form of a flow guide tube 11, but the specific geometric shape of the flow guide tube is not particularly limited in the present invention. It can be a straight cylinder, such as the cylindrical shape shown in the figure, a polygonal tube with a polygonal cross section, etc., or a conical cylinder, such as a conical cylinder, a polygonal conical cylinder with a polygonal cross section, etc. It can also be a tube with an asymmetric cross section, etc., as long as it can smoothly deliver the received materials to the two discharge pipes. The feed port and the discharge port of the flow guide tube can be of any shape, for example, the feed port is square and the discharge port is circular, the feed port is elliptical and the discharge port is circular, etc.; as a preferred solution, the cross section of the feed port is larger than the cross section of the discharge port.

[0075] In order to distribute the received material to one of the two discharge pipes, the guide tube 11 is configured to be able to swing between two working positions under the drive of a driving device: in the first working position, the discharge port of the guide tube 11 is aligned with the feed port of one of the two discharge pipes; in the second working position, the discharge port of the guide tube 11 is aligned with the feed port of the other of the two discharge pipes. Fig. 7A and Figure 7B The flow guide tube 11 is shown in two different working positions.

[0076] The driving device for driving the flow guide tube 11 to swing between the two working positions can be in various forms and is well known to those skilled in the art. Fig.10 and Fig.11 The driving device 15 can be 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 move linearly and telescopically. Figure 8 The driving rod 16 is shown in the retracted state. Fig. 9 The driving rod 16 is shown in the extended state. Figure 8 and Fig. 9 As shown, a pin shaft 17 is disposed on the lower outer wall of the flow guide tube 11 , and the pin shaft 17 is preferably disposed parallel to the pivot axis around which the flow guide tube 11 pivots.

[0077] See also Fig.10 , which illustrates a form of the driving device. Fig.10As shown, the driving device 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, and a hinge hole is formed at the front end of the driving rod 16, and the driving rod is hinged to the pin 17 of the flow guide tube 11 through the hinge hole. During operation, the driving device drives the driving rod 16 to move telescopically, and the driving rod 16 drives the flow guide tube 11 to rotate through the pin 17 and position it at the first working position or the second working position.

[0078] See also Fig.11 , which illustrates another form of the driving device. Fig.11 As shown, the driving device 15 is fixedly mounted on the mounting bracket 55, and a long slot 53 extending in a direction perpendicular to the length of the rod is formed at the front end of the driving rod, and the pin shaft 17 at the lower side of the guide tube 11 is inserted into the long slot 53 and connected to 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 telescopically, and the driving rod 16 drives the guide tube 11 to rotate through the pin shaft 17 and position it at the first working position or the second working position.

[0079] In order to adapt to the pivot rotation of the guide tube 11, an arc groove 20 with the rotation center of the guide tube 11 as the center is formed on the bracket such as the tee 12, see Figure 8 , Fig.10 and Fig.11 In the assembled state, the pin 17 of the guide tube 11 passes through the arc groove and is connected to the driving rod 16 .

[0080] In the technical solution of the fourth aspect of the present invention described above, the pin shaft 13 used as a pivot shaft is arranged at the upper part of the flow guide tube 11, and the pin shaft 17 used as a driving part is arranged at the lower part of the flow guide tube 11. The present invention is not limited to this, but can adopt other forms, for example, the positions of the pin shaft 13 and the pin shaft 17 can be interchanged, in which case, the setting position of the driving device needs to be adjusted accordingly; in addition, the pin shaft 13 can be arranged in the middle part of the flow guide tube 11, and so on.

[0081] Regarding the fourth aspect of the present invention, its essence is reflected in the fact that the batching mechanism adopts a pendulum-type design, which switches between the first working position and the second position by swinging, thereby realizing the selective distribution of materials to the two feeding pipes. Regarding the driving device, the present invention does not make any special restrictions, and various driving devices that exist in the prior art and are well known to those skilled in the art for driving a certain component to pivot can be used. Regarding the arc groove, other forms can also be used as a substitute, such as a rectangular opening formed on the bracket, etc., as long as it does not interfere with the movement of the pin 17.

[0082] In the embodiment shown, the driving device is arranged outside the bracket or the housing, but the present invention is not limited thereto. As an alternative technical solution, the driving device may also be arranged inside the bracket or the housing, in which case the arc groove for avoiding the movement of the pin 17 may also be omitted. Moreover, in the embodiment shown, the tee 12 is used as a supporting base for the pin 13, the mounting brackets 52, 55, etc., but according to the present invention, the tee may also be omitted, in which case the components such as the pin 13, the mounting brackets 52, 55, etc. that use the tee as a supporting base may be supported on other parts of the bracket, such as the feed pipe as a supporting base.

[0083] As described above with respect to the second aspect of the present invention, the rapidly falling material will impact the wall of the discharge pipe and produce friction with the wall, thereby causing damage and wear to the wall at that position. Similarly, when the guide tube 11 receives the material from the upstream, its inner wall will also be impacted by the material and produce friction with the material. After long-term use, the guide tube needs to be replaced, which increases the equipment cost and prolongs the downtime. Therefore, as a preferred solution, the guide tube 11 adopts a rotationally symmetrical structure, which means that the guide tube 11 can still be used with the adjacent structure by rotating a certain angle along the circumferential direction (i.e., adjusting along the circumferential direction), and the angle includes but is not limited to +90 degrees, +180 degrees, -90 degrees +120 degrees or -120 degrees, etc. After rotating the angle, the non-wear inner wall of the guide tube occupies the position of the inner wall that has been worn after a period of use. In addition, in the case of a guide tube 11 with a rotationally symmetrical structure, the position of the corresponding rotation angle on the guide tube 11 needs to be provided with a corresponding structure according to the specific structure of the driving device used. For example, when using Fig.10 and Fig.11 In the case of the driving device shown, structural components such as the pin 13 and the pin 17 need to be provided.

[0084] In the case where an arc groove 20 with the rotation center of the flow guide tube 11 as the center is formed on the bracket such as the tee 12, see Figure 8 , Fig.10 and Fig.11 , the coal in the bracket, such as the tee 12, may leak out from the arc groove 20, or the coal may get stuck in the arc groove and hinder the operation of the driving device. Therefore, as a preferred solution, a sealing structure for sealing the arc groove may be provided. Fig.12 , which illustrates a form of sealing structure, such as Fig.12As shown, the sealing structure includes an arc-shaped strip 80 connected to the pin shaft 13 and rotating therewith. The arc-shaped strip 80 is a strip with the rotation center of the guide tube 11 as the center of the circle. When connected to the pin shaft 17, the arc-shaped strip 80 extends from both sides of the pin shaft 17 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 provided along the arc-shaped groove 20. The arc-shaped strip 80 is inserted into the arc-shaped guide groove 81 from one end of the arc-shaped guide groove 81, and the inner plate surface of the arc-shaped strip 80 is against the outer wall of the tee 12, and the outer plate surface abuts against the inner wall of the arc-shaped guide groove 81, thereby ensuring the sealing effect of the arc-shaped strip 80. When the arc-shaped guide groove 81 is not provided, the arc-shaped strip 80 is fixedly connected to the pin 17; when the arc-shaped guide groove 81 is provided, the arc-shaped strip 80 and the pin 17 can be either fixedly connected or rotatably connected.

[0085] As a preferred technical solution, an arc-shaped guide plate 36 can be provided at the feed port of the coal drop pipe, with its open side facing the material delivered upstream to guide the material into the guide tube 11. Figure 7 and Fig. 9 As shown, the material conveying belt conveyor 1 conveys the material to the feed port 37, and the material leaving the material conveying belt conveyor 1 hits the arc-shaped guide plate 36, and then flows downward along the arc-shaped guide plate into the guide tube 11. The guide plate shown in the figure is arc-shaped, but the present invention is not limited thereto. The guide plate can adopt any other structure with a groove-shaped cross-section. The baffles or wing plates on both sides of the guide plate have a rectifying effect to prevent the coal from flowing to both sides. As a preferred solution, the guide plate gradually closes from top to bottom, that is, the cross section gradually decreases, so as to achieve the effect of gathering and rectifying.

[0086] like Figure 7 , Fig. 9 and Fig.9A As shown, as a preferred technical solution, the arc guide plate 36 is pivotally mounted on the bracket and can rotate around the pivot to adjust the position of the arc guide plate 36 relative to the guide tube 11 and / or the material conveying belt 1, thereby facilitating the transportation of the coal flow. Figure 7 , Fig. 9 and Fig.9AAs shown, a plurality of axially spaced lugs 39 are provided on the back of the arc-shaped guide plate 36, and a hole is formed on the lug. A shaft 40 extends through the hole on the lug and is fixedly connected to the hole, so that the shaft rotates with the arc-shaped guide plate 36. Both ends of the shaft 40 are fitted in holes formed on 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 tube 11 is in the first working position or the second working position. After being adjusted in place, it can be locked by using, for example, a locking nut. In addition, the arc-shaped guide plate 36 can be mounted on the shaft 40 through the hole on the lug 39 and can rotate relative to the shaft 40. In this way, the same driving device as the guide tube 11 can be used to rotate the arc-shaped guide plate 36, and its description is omitted here.

[0087] Although it is a preferred solution to set a guide plate at the feed port of the coal drop pipe, the guide plate can also be omitted; in addition, as a modified solution, the batching mechanism 10 can include both the guide tube 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 tube, and the guide tube and the arc-shaped guide plate are fixedly connected or formed in one piece. In addition, if Figure 1 and Fig. 9 As shown, the coal drop pipe is provided with a shell 50 at the feed port 37. As a modification, the shell 50 may be omitted.

[0088] In the above part of the present application, the technical solutions of the first to fourth aspects of the present invention are described respectively. The contents of these aspects can constitute a technical solution alone, or two, three or four aspects can be combined to constitute a corresponding combined technical solution.

[0089] The present invention has been described above with reference to the accompanying drawings in combination with specific embodiments, but this is only for the purpose of illustration, and the present invention 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 invention, and these changes and modifications should also be understood to belong to the scope of the present invention, and the scope of the present invention is limited by the technical solution claimed and its equivalents.

Claims

1. A coal drop pipe, comprising a batching mechanism and two feed pipes, each of the feed pipes comprising a feed port at the upper end and a discharge port at the lower end, the feed port is used to receive materials distributed by the batching mechanism, the materials flow through the feed pipes and are delivered through the discharge port, and the feed ports of the two feed pipes are adjacent to each other; characterized in that: The batching mechanism is arranged upstream of the two feeding pipes to receive materials and selectively distribute the received materials to one of the two feeding pipes; the batching mechanism includes a flow guide tube, the upper end of the flow guide tube is a feed port, and the lower end of the flow guide tube is a discharge port; The dosing mechanism is pivotally mounted on a bracket and is configured to swing around a pivot axis between a first working position and a second working position under the drive of a driving device. In the first working position, the discharge port of the flow guide tube is aligned with the feed port of one of the two discharge tubes; in the second working position, the discharge port of the flow guide tube is aligned with the feed port of the other of the two discharge tubes.

2. The coal drop pipe according to claim 1, characterized in that: The flow guide tube is a straight tube or a tapered tube.

3. The coal drop pipe according to claim 1, characterized in that: The pivot axis around which the dosing mechanism swings is located at the upper part of the flow guide tube.

4. The coal drop pipe according to claim 3, characterized in that: Two first pins are coaxially arranged on the outer side of the upper part of the guide tube and extend away from the outer wall of the guide tube. The two first pins constitute the pivot axis. A mounting hole is provided on the bracket, and the first pin is mounted in the mounting hole.

5. The coal drop pipe according to any one of claims 1 to 4, characterized in that: The coal drop pipe includes a tee, which includes a feed port and two discharge ports, and the two discharge ports are respectively connected to the feed ports of the two drop pipes; the guide tube is located in the tee, and the tee constitutes the bracket.

6. The coal drop pipe according to claim 1, characterized in that: The driving device includes a driving rod with linear telescopic motion, the driving device is rotatably mounted on the bracket through a rotating shaft, a hinge hole is formed at the front end of the driving rod, a second pin shaft is provided on the guide tube tube, which is parallel to the pivot axis of the batching mechanism and spaced apart from the pivot axis up and down, and the driving rod is hinged to the second pin shaft through the hinge hole.

7. The coal drop pipe according to claim 1, characterized in that: The driving device includes a driving rod with linear telescopic movement, the driving device is fixedly installed on the bracket, the front end of the driving rod is formed with a long groove extending in a direction perpendicular to the long direction of the driving rod, and the guide tube is provided with a second pin shaft parallel to the pivot axis of the batching mechanism and spaced apart from the pivot axis up and down, the second pin shaft is inserted in the long groove and connected to the driving rod.

8. The coal drop pipe according to claim 6 or 7, characterized in that: The driving device includes a pneumatic driving device, a hydraulic driving device, an electro-hydraulic driving device and an electric driving device.

9. The coal drop pipe according to claim 1, characterized in that: The coal drop pipe also includes a groove-shaped guide plate, the open side of which faces the material distributed upstream, so as to guide the material into the guide tube.

10. The coal drop pipe according to claim 9, characterized in that: The cross section of the groove-shaped guide plate gradually decreases from top to bottom.

11. The coal drop pipe according to claim 9 or 10, characterized in that: The groove-shaped guide plate is an arc-shaped guide plate.

12. The coal drop pipe according to claim 9 or 10, characterized in that: The groove-shaped guide plate is pivotally mounted on a bracket and can be rotated around a rotation axis parallel to the pivot axis to adjust a working position relative to the guide tube.

13. The coal drop pipe according to claim 9 or 10, characterized in that: The grooved guide plate is fixedly connected to the guide tube or formed integrally with the guide tube, and extends upward from the feed port of the guide tube. The grooved guide plate and the guide tube constitute the batching mechanism.

14. The coal drop pipe according to claim 1, characterized in that: The cross section of the feed opening of the flow guide tube is larger than the cross section of the discharge opening of the flow guide tube.

15. The coal drop pipe according to claim 4, characterized in that: The first pin shaft is fitted in the mounting hole through a bearing.

16. The coal drop pipe according to claim 1, characterized in that: The guide tube adopts a rotationally symmetrical structure, and its circumferential installation position can be adjusted along the circumference, so that the non-wear inner wall of the guide tube occupies the position of the inner wall that is worn after a period of use.

17. The coal drop pipe according to claim 16, characterized in that: The circumferential installation position of the guide tube can be adjusted at angles including +90 degrees, +180 degrees, -90 degrees, +120 degrees or -120 degrees.

18. The coal drop pipe according to claim 6 or 7, characterized in that: The bracket is formed with an arc groove with the pivot axis as the center, and the pin passes through the arc groove and is connected to the driving rod.

19. The coal drop pipe according to claim 18, characterized in that: The bracket is a tee.

20. The coal drop pipe according to claim 18, characterized in that: The coal drop pipe comprises a sealing structure for sealing the arc-shaped groove.

21. The coal drop pipe according to claim 20, characterized in that: The sealing structure includes an arc-shaped slat connected to the pin shaft and rotating therewith, the arc-shaped slat is a slat with the pivot axis as the center, and when connected to the pin shaft, the arc-shaped slat extends from both sides of the pin shaft and always covers the arc-shaped groove, and the arc-shaped slat is fixedly connected to the pin shaft.

22. The coal drop pipe according to claim 21, characterized in that: The sealing structure includes an arc-shaped slat connected to the pin shaft and rotating therewith, the arc-shaped slat being a slat with the pivot shaft as the center, and extending from both sides of the pin shaft and always covering the arc-shaped groove when connected to the pin shaft; an arc-shaped guide groove is provided along the arc-shaped groove, and the arc-shaped slat is inserted into the arc-shaped guide groove from one end thereof, so that the inner plate surface of the arc-shaped slat is against the outer wall of the bracket, and the outer plate surface of the arc-shaped slat abuts against the inner wall of the arc-shaped guide groove; the arc-shaped slat is fixedly connected or rotationally connected to the pin shaft.

23. A material distribution method for a coal drop pipe, the coal drop pipe comprising a batching mechanism and two feed pipes, each of the feed pipes comprising a feed inlet at an upper end and a feed outlet at a lower end, the feed inlet being used to receive materials distributed by the batching mechanism, the materials flowing through the feed pipes and being delivered through the feed outlets, the feed inlets of the two feed pipes being adjacent to each other; The batching mechanism is arranged upstream of the feed pipe, and comprises a flow guide tube, the upper end of the flow guide tube is a feed inlet, and the lower end of the flow guide tube is a discharge outlet; The batching mechanism is pivotally mounted on the bracket and can swing between a first working position and a second working position. In the first working position, the discharge port of the flow guide tube is aligned with the feed port of one of the two feed tubes. In the second working position, the outlet of the flow guide tube is aligned with the feed inlet of the other of the two feed tubes; the method comprises: Swing the batching mechanism to the first working position or the second working position; as well as The material transmitted from the upstream is received through the feed opening of the guide tube and the received material is transmitted through the discharge opening of the guide tube to the down pipe whose feed opening is aligned with the discharge opening of the guide tube.

Images