Deslagging system of coal mill

Abstract

The invention provides a coal mill deslagging system which comprises a placing rack, a material receiving pipeline and a control cabinet, a material conveying opening connected with the material receiving pipeline is formed in a top plate of the placing rack, a pneumatic wear-resistant deslagging valve and a pneumatic wear-resistant rotary deslagging valve are installed on the material receiving pipeline, a transfer box is arranged below the front side rack, and the transfer box is connected with the material receiving pipeline. A sealing assembly located on the outer side of the conveying opening and matched with a top receiving opening of the transfer box is arranged on the bottom face of the top plate, a lifting mechanism for driving the transfer box to ascend and descend is installed on the front side rack, and a lifting type material level detection device extending into the transfer box is installed on the top plate of the containing rack. The top of the control cabinet is provided with an audible and visual alarm electrically connected with the lifting type material level detection device. The pneumatic wear-resistant slag discharging valve and the pneumatic wear-resistant rotary slag discharging valve are arranged to replace an existing slag discharging door, so that the smooth degree of slag discharging work is effectively improved, and the problem of jamming in the slag discharging process is avoided; by arranging the sealing assembly, the sealing degree of the deslagging system is improved, and the problems of air leakage and ash leakage are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of coal mill equipment, and in particular to a coal mill slag discharge system. Background Art

[0002] At present, there are always some granular materials that are difficult to grind during the operation of the medium-speed coal mill in the pulverizing system of thermal power plants. These granular materials are called pebble coal. During the coal grinding process of the medium-speed coal mill, the pebble coal can be separated and enter the pebble coal slag box at the lower side of the medium-speed coal mill. The lower end of the pebble coal slag box has a cylindrical pebble coal discharge port facing downward. The pebble coal discharge port is connected to a slag discharge valve. The slag discharge valve is used to keep the medium-speed coal mill closed when no material is discharged. During the operation of the medium-speed coal mill, the discharge valve must be opened intermittently to discharge the stones in the pebble coal slag box from the pebble coal discharge port. The discharged pebble coal needs to be sent from the plant building at the medium-speed coal mill site to the outdoor ash slag yard.

[0003] In recent years, the coal supply has been tight, the coal types have changed greatly, and the proportion of market coal blending has increased. The deviation from the designed coal type is large, resulting in a large amount of pebble coal. At present, the overall sealing of the pebble coal slag discharge system of the coal mill is not tight, air leakage and ash leakage occur, and the slag discharge door is often stuck. The above problems seriously affect the normal operation of the pulverizing system and the load-carrying capacity of the unit. Summary of the invention

[0004] The object of the present invention is to provide a coal mill slag discharge system to solve the above technical problems.

[0005] The present invention provides a coal mill slag discharge system, comprising a placement frame, a material receiving pipeline and a control cabinet, a top plate of the placement frame is provided with a material delivery port connected to the material receiving pipeline, a pneumatic wear-resistant slag discharge valve and a pneumatic wear-resistant rotary slag discharge valve are installed on the material receiving pipeline, a transfer box is arranged below the front frame, a sealing component is arranged on the bottom surface of the top plate, which is located outside the material delivery port and cooperates with the top material receiving port of the transfer box, a lifting mechanism for driving the transfer box to rise and fall is installed on the front frame, a lifting type material level detection device extending to the inside of the transfer box is installed on the top plate of the placement frame, and an audible and visual alarm electrically connected to the lifting type material level detection device is installed on the top of the control cabinet.

[0006] Furthermore, the material receiving pipe is arranged at an angle, a supporting frame is arranged at the rear side of the placing frame, the top end of the material receiving pipe is installed on the supporting frame, and a dust blocking cloth is arranged at a position of the supporting frame near the top inlet of the material receiving pipe.

[0007] Furthermore, the placement rack includes columns located at four corners and the top plate, a connecting plate is installed on the top of the column, and the top plate is installed on the bottom surface of the connecting plate.

[0008] Furthermore, a pressure relief pipe is installed on the top plate near the feeding port, and a pressure relief valve is arranged on the pressure relief pipe.

[0009] Furthermore, a sliding and lifting guide wheel is installed on the column, and the guide wheel is slidably connected to the side wall of the transfer box.

[0010] Furthermore, a guide groove cooperating with the guide wheel is horizontally opened on the side wall of the transfer box.

[0011] Furthermore, a material receiving plate is provided on the top of the transfer box, and the material receiving port is provided at the middle position of the material receiving plate.

[0012] Furthermore, a first through hole is formed on the material receiving plate, and a second through hole corresponding to the first through hole is formed on the connecting plate. Bolts are passed through the first through hole and the second through hole, and the bolts are threadedly connected with a support nut located below the material receiving plate and a locking nut located above the connecting plate.

[0013] Furthermore, the lifting mechanism includes a cylinder installed on the placement frame, and the telescopic end of the cylinder is connected to a lifting claw, and the lifting claw is arranged below the material receiving plate and contacts with the lower surface of the material receiving plate.

[0014] Furthermore, an observation window is provided on the transfer box, and a slot is provided on the front surface of the transfer box.

[0015] The present invention replaces the existing slag discharge door by arranging a pneumatic wear-resistant slag discharge valve and a pneumatic wear-resistant rotary slag discharge valve, thereby effectively improving the smoothness of slag discharge work and avoiding the problem of jamming during the slag discharge process; and by arranging a sealing component, the sealing degree of the slag discharge system is improved to avoid the problems of air leakage and ash leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a front view of the present invention;

[0018] Figure 2 is a side view of the present invention;

[0019] Figure 3 It is the internal structure diagram of the lifting mechanism of the present invention;

[0020] Figure 4 It is a schematic diagram of the movement of the lifting mechanism of the present invention;

[0021] Description of reference numerals:

[0022] In the figure: 1-placing rack, 11-column, 111-slideway, 12-connecting plate, 13-top plate, 141-guide wheel, 142-sliding seat, 143-limiting block, 15-locking nut, 2-material receiving pipe, 21-pneumatic wear-resistant slag discharge valve, 22-pneumatic wear-resistant rotary slag discharge valve, 3-carrying rack, 31-ash blocking cloth, 4-lifting mechanism, 41-articulated frame, 42-cylinder, 421-telescopic end, 43-ash blocking box, 44-lifting slot, 45-lifting frame, 46-slide rail, 47-rotating shaft, 48-lifting claw, 5-transfer box, 51-material receiving plate, 52-guide slot, 53-observation window, 54-slot, 61-bracket, 62-level meter, 63-hydraulic cylinder, 71-spraying device, 72-pressure relief device, 8-control cabinet, 81-sound and light alarm; DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0025] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] Example 1

[0027] like Figure 1-Figure 4 As shown:

[0028] A coal mill slag discharge system includes a placement frame 1, a material receiving pipe 2, a bearing frame 3 and a control cabinet 8. The top end of the material receiving pipe 2 is installed on the bearing frame 3 and connected to the slag discharge pipe. The bottom end of the material receiving pipe 2 is installed on the placement frame 1 and connected to a transfer box 5 at the bottom of the placement frame 1. The control cabinet 8 is installed on one side of the placement frame 1.

[0029] The material receiving pipe 2 is arranged at an angle, and a dust blocking cloth 31 is arranged at a position of the supporting frame 3 close to the top inlet of the material receiving pipe 2 .

[0030] A pneumatic wear-resistant slag discharge valve 21 and a pneumatic wear-resistant rotary slag discharge valve 22 are installed on the material receiving pipeline 2 .

[0031] The placement rack 1 includes columns 11 located at four corners, and a connecting plate 12 is installed on the top of each of the four columns 11 .

[0032] A top plate 13 is disposed in the middle of the four upright posts 11 , and the top plate 13 is mounted on the lower surfaces of the four connecting plates 12 .

[0033] A material delivery port corresponding to the bottom outlet of the material receiving pipe 2 is provided in the middle of the top plate 13 , and a lifting material level detection device, a spray device 71 and a pressure relief device 72 are provided near the material delivery port on the top plate 13 .

[0034] The lifting type material level detection device includes a bracket 61 , which is mounted on the top plate 13 . A hydraulic cylinder 63 is arranged above the bracket 61 . A material level meter 62 is connected to the telescopic end 421 of the hydraulic cylinder 63 . The material level meter 62 is lifted and lowered by the driving of the hydraulic cylinder 63 .

[0035] The hydraulic cylinder 63 is a conventional hydraulic cylinder, and its oil source can be set on one side of the supporting frame 3 , and its oil circuit can be laid along one side of the supporting frame 3 to the placement frame 1 .

[0036] A through hole is provided on the top plate 13 , and the material level meter 62 is slidably connected to the through hole with a rubber sealing pad provided therebetween. The hydraulic cylinder 63 drives the material level meter 62 to descend into the transfer box 5 .

[0037] The spray device 71 includes a spray pipe, which passes through the top plate 13 and extends to the transfer box 5 below the top plate 13. The spray pipe is provided with a water inlet valve and an air release valve.

[0038] The pressure relief device 72 includes a pressure relief pipe, which passes through the top plate 13 and extends to the transfer box 5 below the top plate 13. A pressure relief valve is provided on the pressure relief pipe.

[0039] A sealing ring is provided on the lower surface of the top plate 13, which surrounds the material delivery port, the material level meter 62, the spray pipe and the pressure relief pipe to ensure high sealing performance of the material level detection, spraying work and pressure relief work during the slag discharge process.

[0040] A controller is provided in the control cabinet 8 , and the hydraulic cylinder 63 , the material level meter 62 , the water inlet valve and the pressure relief valve are electrically connected to the controller respectively. An audible and visual alarm 81 electrically connected to the material level meter 62 through the controller is provided above the control cabinet 8 .

[0041] The pneumatic wear-resistant slag discharge valve 21 and the pneumatic wear-resistant rotary slag discharge valve 22 are electrically connected to the controller.

[0042] The transfer box 5 is arranged in a placement space surrounded by four columns 11 .

[0043] The transfer box 5 includes a box body and a top receiving plate 51 . A receiving opening is provided in the middle of the receiving plate 51 , and the receiving opening is provided corresponding to the sealing ring.

[0044] The transfer box 5 is provided with an observation window 53 and a slot 54. The observation window 53 is used to observe the internal slag discharge situation. The slot 54 facilitates the insertion of the front fork of a forklift to drive the transfer box 5 to move. The bottom of the transfer box 5 is provided with supporting feet. The operator can enter the space between the supporting feet through a balanced pallet truck to move the transfer box 5.

[0045] A lifting mechanism 4 for driving the transfer box 5 to rise and fall is installed on the placement frame 1.

[0046] The lifting mechanism 4 includes a cylinder 42 and two ash baffles 43. The two ash baffles 43 are symmetrically installed on the placement frame 1. The bottom of the ash baffles 43 is installed on two adjacent front and rear connecting plates 12. An articulated frame 41 is provided at the bottom of the ash baffles 43. The cylinder 42 is installed on the articulated frame 41. The fixed end of the bottom of the cylinder 42 is rotatably connected to the articulated frame 41, and the telescopic end 421 at the top of the cylinder 42 extends into the ash baffle 43.

[0047] A lifting slot 44 is provided in the ash blocking box 43, and a lifting frame 45 is slidably installed in the lifting slot 44. The lifting frame 45 slides up and down in the lifting slot 44; a horizontally opened slide rail 46 is provided on the middle inner wall of the lifting frame 45, and a rotating shaft 47 is installed in the slide rail 46. The rotating shaft 47 slides horizontally back and forth along the opened slide rail 46; the telescopic end 421 at the top of the cylinder 42 is rotatably connected to the rotating shaft 47.

[0048] The bottom of the lifting frame 45 is provided with a lifting claw 48 extending to the bottom of the ash blocking box 43, and the lifting claw 48 is arranged below the receiving plate 51. When the lifting mechanism 4 drives the transfer box 5 to rise, the lifting claw 48 contacts the lower surface of the receiving plate 51 and lifts the transfer box 5 under the action of the cylinder 42.

[0049] The air cylinder 42 is a conventional air cylinder 42 , and its air source can be arranged on one side of the supporting frame 3 , and its air path can be laid along one side of the supporting frame 3 to the placing frame 1 .

[0050] A guide mechanism slidably connected to the column 11 is installed on the column 11 .

[0051] A vertically arranged slide groove 111 is provided on the outer side surface of the column 11, and the guide mechanism includes a sliding seat 142 and a guide wheel 141. The sliding seat 142 is provided with a slider arranged in the slide groove 111 and cooperating with the slide groove 111, and the guide wheel 141 is installed on the sliding seat 142 near the left and right side walls of the transfer box 5.

[0052] A horizontal guide groove 52 is formed on the side wall of the transfer box 5 , and the guide wheel 141 is matched with the guide groove 52 and slides in the guide groove 52 .

[0053] A stop groove corresponding to the position of each guide wheel 141 can be set in the guide groove 52. When the transfer box 5 reaches the specified position, the guide wheel 141 is inserted into the stop groove to achieve temporary position locking. In the absence of external force, the transfer box 5 will not move forward or backward.

[0054] A limit block 143 is disposed on the column 11 and is located below the sliding seat 142 . The setting of the limit block 143 ensures the minimum setting height of the guide wheel 141 .

[0055] The receiving plate 51 is provided with a first through hole, and the top plate 13 is provided with a second through hole that penetrates the connecting plate 12. The first through hole and the second through hole are provided correspondingly. Bolts are passed through the first through hole and the second through hole, and the bolts are threadedly connected with a support nut located below the receiving plate 51 and a locking nut 15 located above the connecting plate 12.

[0056] The sealing component in this embodiment is a sealing ring. The position where the sealing ring is set at the bottom of the top plate 13 can be opened as a stepped groove. The sealing ring is set on the inner wall of the groove. The material receiving port on the top of the transfer box 5 is set as an annular protrusion, and the sealing ring is located between the material receiving port and the groove.

[0057] When the present invention is working, the top inlet connection of the material receiving pipe 2 is connected to the slag discharge pipe, the transfer box 5 is moved to the front side of the placement rack 1, and the transfer box 5 is moved to the bottom of the placement rack 1 by a pallet balancing vehicle or a forklift. During the movement, the guide wheels 141 begin to contact the guide grooves 52 on the side walls of the transfer box 5 until the two guide wheels 141 on each side of the transfer box 5 enter the guide grooves 52 or are stuck in the stop grooves.

[0058] The guide mechanism is provided to prevent the transfer box 5 from moving left and right, and the stop groove is provided to prevent the transfer box 5 from moving forward and backward.

[0059] When the transfer box 5 moves from the front side of the placement rack 1 to under the placement rack 1 , the height of the lifting claw 48 is lower than the height of the receiving plate 51 of the transfer box 5 .

[0060] When the transfer box 5 reaches the designated position under the rack 1, the bolts are passed through the first through holes and the second through holes, the support nuts under the bolts are installed and fixed, and the locking nuts 15 above the bolts are screwed in.

[0061] The cylinder 42 is started, and the telescopic end 421 of the cylinder 42 extends out, and the telescopic end 421 of the cylinder 42 drives the rotating shaft 47 to move upward, and the rotating shaft 47 moves inward along the slide rail 46, and at the same time drives the lifting frame 45 to move upward, and then drives the lifting claw 48 to move upward, and the lifting claw 48 contacts the receiving plate 51 of the transfer box 5, and then drives the transfer box 5 to move upward. At the same time, the guide wheel 141 and the sliding seat 142 move upward along the slide groove 111 of the column 11 until the receiving port of the transfer box 5 cooperates with the sealing ring.

[0062] After the material receiving port of the transfer box 5 is matched with the sealing ring, the locking nut 15 is further screwed downward to improve the connection stability between the transfer box 5 and the placement rack 1.

[0063] The hydraulic cylinder 63 is started, and the material level meter 62 is extended into the transfer box 5 under the drive of the hydraulic cylinder 63 , the pneumatic wear-resistant slag discharge valve 21 and the pneumatic wear-resistant rotary slag discharge valve 22 are opened, and the pebble coal enters the transfer box 5 through the material receiving pipe 2 , and the material level meter 62 detects the material level height of the pebble coal in the transfer box 5 .

[0064] During the slag discharge process, the pressure can be released through the pressure relief device 72, and the transfer box 5 can be sprayed by the spray device 71 to reduce the temperature and dust.

[0065] When the material level meter 62 detects that the material level of the stone coal in the transfer box 5 reaches the highest level, the material level meter 62 transmits a signal to the controller, and the controller controls the sound and light alarm 81 to start an alarm to remind the operator that the material level in the transfer box 5 is full.

[0066] When the transfer box 5 has finished receiving the material, the pneumatic wear-resistant slag discharge valve 21 and the pneumatic wear-resistant rotary slag discharge valve 22 are closed, the hydraulic cylinder 63 starts to retract, and the material level meter 62 retracts under the drive of the hydraulic cylinder 63 and separates from the transfer box 5; the cylinder 42 starts to retract, and the telescopic end 421 of the cylinder 42 is retracted, and the telescopic end 421 of the cylinder 42 drives the rotating shaft 47 to move downward, and the rotating shaft 47 moves outward along the slide rail 46, while driving the lifting frame 45 to move downward, and the lifting claw 48 to move downward, and then drive the transfer box 5 to move downward, and the material receiving port of the transfer box 5 is separated from the sealing ring until the transfer box 5 falls on the ground, and the lifting claw 48 is no longer in contact with the material receiving plate 51 of the transfer box 5.

[0067] Finally, the transfer box 5 is taken out from under the placement rack 1 by a pallet balancing vehicle or a forklift. Under the action of external force, the guide wheel 141 slides and separates in the travel groove until the transfer box 5 moves to the front side of the placement rack 1 and the guide wheel 141 separates from the guide groove 52.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A coal mill slag discharge system, characterized in that It includes a placement rack, a material receiving pipeline and a control cabinet. A material delivery port connected to the material receiving pipeline is opened on the top plate of the placement rack, a pneumatic wear-resistant slag discharge valve and a pneumatic wear-resistant rotary slag discharge valve are installed on the material receiving pipeline, a transfer box is arranged under the front rack, a sealing component is arranged on the bottom surface of the top plate, which is located outside the material delivery port and cooperates with the top material receiving port of the transfer box, a lifting mechanism for driving the transfer box to rise and fall is installed on the front rack, a lifting material level detection device extending to the inside of the transfer box is installed on the top plate of the placement rack, and an audible and visual alarm electrically connected to the lifting material level detection device is installed on the top of the control cabinet.

2. The coal mill slag discharge system according to claim 1, characterized in that: The material receiving pipe is arranged at an angle, a supporting frame is arranged at the rear side of the placing frame, the top end of the material receiving pipe is mounted on the supporting frame, and a dust blocking cloth is arranged at a position of the supporting frame near the top inlet of the material receiving pipe.

3. The coal mill slag discharge system according to claim 1, characterized in that: The placement rack comprises columns located at four corners and the top plate, a connecting plate is installed on the top of the column, and the top plate is installed on the bottom surface of the connecting plate.

4. The coal mill slag discharge system according to claim 1, characterized in that: A pressure relief pipe is installed on the top plate at a position close to the material delivery port, and a pressure relief valve is arranged on the pressure relief pipe.

5. The coal mill slag discharge system according to claim 3, characterized in that: A guide wheel for sliding and lifting is installed on the column, and the guide wheel is slidably connected to the side wall of the transfer box.

6. The coal mill slag discharge system according to claim 5, characterized in that: A guide groove cooperating with the guide wheel is horizontally opened on the side wall of the transfer box.

7. The coal mill slag discharge system according to claim 3, characterized in that: A material receiving plate is arranged on the top of the transfer box, and the material receiving opening is arranged at the middle position of the material receiving plate.

8. The coal mill slag discharge system according to claim 7, characterized in that: A first through hole is formed on the material receiving plate, and a second through hole corresponding to the first through hole is formed on the connecting plate. Bolts are passed through the first through hole and the second through hole, and the bolts are threadedly connected with a support nut located below the material receiving plate and a locking nut located above the connecting plate.

9. The coal mill slag discharge system according to claim 7, characterized in that: The lifting mechanism comprises a cylinder mounted on the placing frame, the telescopic end of the cylinder is connected with a lifting claw, and the lifting claw is arranged below the material receiving plate and contacts with the lower surface of the material receiving plate.

10. The coal mill slag discharge system according to claim 1, characterized in that: An observation window is arranged on the transfer box, and a slot is arranged on the front surface of the transfer box.

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