JP2013535648A - Hydraulic drive for thrust combustion grate - Google Patents

Abstract

The present invention relates to a hydraulic drive for a water-cooled thrust combustion grate. Each replaceable grate plate (6) is connected to at least one connecting rod (30) supported on the end of the crank (31) and the corresponding crankshaft (32) is connected to the side wall ( 2) supported by a bushing (33) penetrating through. The crank (34) connected to the piston (35) of the hydraulic cylinder piston unit (36, 35) is fixed to the other side of the crankshaft (32) outside the grate structure of the grate passage, The hydraulic cylinder piston unit is disposed outside the grate structure of the grate passage. This places the hydraulic component away from the grate plate and is not affected by wear. The parts arranged away from the movable grate plate (6) can also be replaced during the operation of the grate.
[Selection] Figure 6

Description

Detailed Description of the Invention

  The present invention relates to a drive unit for a water-cooled thrust combustion grate of a waste combustion plant that is particularly suitable for burning waste and dust with a high calorific value. Such a thrust burning grate has a fixed grate stage and a movable grate stage, consisting of grate plates or grate bars, which are placed on top of each other in a stepped manner. . These thrust combustion grate can be assembled such that the firebed is essentially horizontal or inclined at an inclination angle of generally 20 ° or more. These grate plates are preferably made of steel plates and form panel-like hollow parts that extend over the entire width of the grate passages, through which water as a coolant flows. Every second grate plate is movable, thereby agitating or transferring the combustion material. In the feed grate, the movable grate plate pushes the combustion material to the lower adjacent grate plate. On the other hand, the reverse feed grate is effectively formed in a graded structure that is continuously inclined. In the reverse feed grate, the front end side of the movable grate plate feeds the combustion material backward, and the combustion material falls backward along the inclination of the grate. The movable grate plate, that is, the grate plate located between the two fixed grate plates, moves from the lower side of each slope. This ensures that the burning waste on the grate, with a long residence time of 45 to 120 minutes, is constantly flipped over and distributed evenly on the grate.

  EP-0,621,449 discloses a water-cooled thrust combustion grate. The grate has a grate plate that extends the entire width of the grate passage. That is, it is not constituted by a plurality of grate bars per grate stage. Like the fixed grate plate, the movable grate plate is fixed by a crossbar at the rear edge thereof, and these crossbars move back and forth in conjunction with each other to move the movable grate plate. EP-0,874,195 discloses a specific structure of a grate plate with a drive device separated for each movable grate. Here, the movable grate plate rolls on a steel roller and is guided laterally along the side end plate on a horizontal roller. The driving device is provided for each hydraulic piston / cylinder unit. The hydraulic piston cylinder unit is in contact with the grate plate at substantially the center and is disposed under the grate plate.

  The structure of the drive device of the present invention is disposed under the grate. A hydraulic piston / cylinder unit corresponding to the drive device is also arranged under the grate. The hydraulic piston cylinder units are difficult to contact each other, especially during the operation of the grate, due to the prevailing temperature and because the slag falls through the grate, making it difficult to contact.

  The object of the present invention is in particular to produce a hydraulic drive for a water-cooled thrust combustion grate that is safe to drive, is cost-effective to manufacture and can be easily mounted. In addition, the drive is easy to maintain and is thereby accessible during the combustion operation, and the hydraulic piston cylinder unit in the individual drive for each grate can be replaced without disturbing the operation of the grate. It becomes possible.

  The above objective is accomplished by a hydraulic drive for a water cooled thrust combustion grate. In the hydraulic drive for a water-cooled thrust combustion grate, each movable grate constituting the grate is connected to at least one connecting rod supported at the other end of the crank. The corresponding crankshaft is supported by a bushing penetrating the side wall of the grate structure, and the crank connected to the piston of the hydraulic cylinder piston unit is disposed on the other end side of the crankshaft.

  First, a thrust combustion grate in a conventional hydraulic drive is shown in the figure, where a special hydraulic drive is represented. The driving device and its function will be described with reference to these drawings.

  The basic structure of a thrust combustion grate with important parts is apparent from FIG. Here, the state of the lower structure is shown except for some grate plates. The grate is inclined downward in the transport direction. The two vertical steel walls 1 and 2 that run parallel to each other are firmly connected to each other by a plurality of spacing bars 3 and 4. These spacing bars 3, 4 extend in a direction perpendicular to the grate and traverse the width between the two vertical steel walls 1, 2 in two different stages. The two vertical steel walls 1, 2 on the left and right of the combustion grate consist of a plurality of steel panels that are suitably screwed together. The spacing bars 3, 4 have threads on both ends and pass through the two vertical steel walls 1, 2. The spacing bars 3, 4 are firmly screwed to the two vertical steel walls 1, 2 by means of tapered ends and nuts. The upper separation bar or cross bar 3 also functions as a support rod for the fixed grate plate 5 disposed above. The front end of the lowermost fixed grate plate 5 abuts on the discharge lip 7 welded between the vertical steel walls 1 and 2, and the rear end is above the first upper separation bar or cross bar 3. It is hung. The front lower end of the next movable grate plate 6 is placed on the lower first fixed grate plate 5. The front lower end of the next fixed grate plate 5 is placed on the lower movable grate plate 6. An air groove 8 is formed on the front side of each grate plate 5, 6, and combustion air is blown from below through these grooves. Along the upper ends of the steel walls 1 and 2, two rectangular tubes 9 and 10 are arranged so as to be slightly shifted and overlapped. The lower ends of the tubes 9 and 10 are sealed by welding. These tubes 9 and 10 form the two side panels of the grate passage and regulate the sides of the combustion fire bed when the grate is in operation. Since these pipes 8 and 9 are water-cooled and are forcibly supplied with water from the bottom to the top, the inside thereof is always completely filled with water. Each grate plate 5 and 6 is made of a steel plate and is formed as a hollow body. Water is forcibly supplied to the inside and is always completely filled with water, thereby generating bubbles inside. do not do. Alternatively, these grate plates form a support frame, and a hollow body through which water flows is inserted as a cooling body. Thereby, it covers with the plate connected with the support frame, and the cooling body which surely radiates heat. Thus, all steel parts of the grate that are brought into contact with the combustion material, whether pipe 8, 9, or grate plate 5, 6, are continuously covered with water or at least water-cooled. It is cooled by a heat sink. Thus, all the parts that come into contact with the fire are continuously cooled and kept at a stable temperature, so that almost no expansion occurs. Thereby, it is not necessary to provide a compensation member on the side surface of the grate plate. The stability of the grate structure is achieved essentially by the spacing bars or crossbars 3, 4 which support the two parallel outer steel plates 1, 2 as described above. Between the crossbars 3 and 4, two other hollow shapes represented by the tubes 11 and 12 extend on both sides of the center of the grate. The pipes 11 and 12 are connected to crossbars 3 and 4 arranged at an upper part and a lower part at some points perpendicular to the pipes 11 and 12. One of the tubes 11, 12, that is, the tube 11 supplies cooling water from the lower end to the upper end of the grate plates 5, 6. On the other hand, the other pipe 12 supplies cooling flushing air for driving the movable grate plate 6. A support member 13 for the movable grate plate 6 is provided between the two parallel quadrangular tubes 11 and 12. These support members 13 are fixed to these square tubes 11 and 12 by two bolts penetrating the two square tubes 11 and 12. Therefore, the square tube or the hollow shape members 11 and 12 are welded with a cross bar having an inner diameter designed to accommodate the holding bolt of the support member 13. The support member 13 itself has a steel roller 16 extending parallel to the corresponding grate plate surface, and steel rollers 17 and 18 acting on the left and right sides thereof on a vertical surface. The movable grate plate 6 moves away from the end, and the steel roll 16 functions as a side guide on the rear side of the movable grate plate 6. Two horizontal steel rollers 19 and 20 are provided for each movable grate 6 in the support members, ie, rectangular tubes 9 and 10, and these rollers are guided laterally into the movable grate 6 from the outside. Yes.

  FIG. 2 shows a longitudinal section of a portion of the grate plate in the conventional movable grate plate 6 drive device. The piston rod 22 of the hydraulic cylinder 21 reaches the inside of the movable grate plate 6. The rear side of the hydraulic cylinder 21 is hinged to the support member 13. The movable grate plate 6 rolls on the roller 17 of the support member 13 at the rear part. The support member 13 is fixed to the rectangular tubes 11 and 12 by two bolts 14 and 15. Each of the fixing members 13 can be tilted rearward by removing the rear bolt 14, and the pivot point of the hydraulic cylinder 21 can be accessed and thereby easily removed. However, this is only done after the use of the grate plate is stopped. The square tube 10 can be recognized behind the grate plates 5 and 6, forms a side plate, and the side wall 2 having the crossbar 4 can be recognized on the lower side.

  In this configuration, as shown in FIG. 2, the hydraulic drive device is disposed directly under the grate plate to avoid a fire hazard. The hydraulic cylinder 21 having the piston rod 22 is newly replaced by a mechanical connecting rod hinged to the crank, and the corresponding crankshaft is inserted from one of the side walls 1 and 2 to the outside. Therefore, the hydraulic member is completely closed with a grate structure as will be described later.

  FIG. 3 is a cross-sectional view showing a grate framework and a grate lower structure excluding the grate plate, that is, a grate as viewed from the front in FIG. The side walls 1, 2, the support formed by the square tubes 9, 10 and the crossbars 3, 4 and the square tubes 11, 12 extending in the middle along the grate can be recognized in FIG. Can do. One support member 13 visible from the front is shown in FIG. 4 together with a horizontal steel roller 16 for horizontally guiding the movable grate 6 and vertical steel rollers 17, 18 for moving the movable grate 6.

  FIG. 5 shows the movable grate plate 6 or the support frame visible from below. The horizontal steel roller 16 is disposed in the recess 23 in the support member 13. The inner width of the recess 23 is configured to be slightly larger than the diameter of the horizontal steel roller 16. The grate plate is properly guided laterally from the horizontal steel roller 16 to the grate passage. Steel rollers 19, 20 (FIG. 1) arranged on the plates 9, 10 function to guide the front side of the movable grate plate. The movable grate 6 has indentations 24 and 25 having guide areas 26 and 27 in lower portions on the front side. The recesses 24 and 25 are provided in parallel to the side surface of the movable grate plate 6. The recesses 24 and 25 are provided on the side opposite to the surface of the movable grate plate 6. The steel rollers 19 and 20 rotate along the guide area when moving inward and outward. Thereby, the movable grate plate 6 has an effective three-point support structure. Behind the center where the drive is located, the movable grate plate 6 is guided horizontally and vertically by corresponding steel rollers 16, 17, 18 and in the front, the movable grate plate 6 19 and 20 to guide left and right. The front lower end of the movable grate 6 is placed on the next fixed grate plate 5 and slides according to the reciprocating motion.

  As described above, the hydraulic cylinder 21 and the hydraulic cylinder row are arranged directly under the grate plate as shown in FIGS. 1 and 2, and all the members are exposed to a downdraft having the influence of wear for many years. Has been. The aim of the drive structure described below is to replace the critical mechanical parts, which have no other parts, with the influence of downdraft wear, while at the same time driving parts sensitive to it outside the grate. It is to clarify the structure.

  FIG. 6 is a perspective view showing a schematic configuration of a liquid drive device for one movable grate plate 6 as viewed obliquely from above. The hydraulic cylinder under the grate plate is returned only by the connecting rod 30. The connecting rod 30 is hinged to a crank 31 that is rotatably attached to a crankshaft 32. The crank 31 has a slot hole 38. Bolts 39 are fixed to the connecting rod 30 in the slot holes 38. When the crank 31 turns back and forth and its end does not move linearly, the connecting rod 30 moves back and forth linearly in the direction indicated by the arrow. The crankshaft 32 is supported by the bushing 33. The bushing 33 penetrates the side wall 2 of the grate structure and is firmly welded or screwed to the side wall 2. Outside the grate structure, the crankshaft 32 includes another crank 34. The crank 34 is hinged to the end of the piston rod 35 of the hydraulic cylinder 36. The cranks 31 and 34 are inserted into end portions of the crankshaft and are tightened by lock nuts. A hydraulic cylinder 36 is hinged to the holding bracket 37 along with the other end of the crankshaft. The holding bracket 37 is fixed to the outside of the side wall 2 of the grate structure. The axis of the bushing 33 extends in a direction perpendicular to the moving direction of the movable grate plate 6. The crank 31 for the connecting rod 30 in the crankshaft 32 is fixed to the crank 34 at the other end of the crankshaft 32 by rotating and turning from about 120 degrees to 180 degrees. When the crank 34 is operated at the other end of the crankshaft 32 and the crankshaft 32 is rotated accordingly, the movable grate plate 6 is moved back and forth along with the back and forth movement of the piston 35 by the hydraulic cylinder piston unit 36. To do. The crankshaft 32 rotates from 0 degree to about 60 degrees under the control of the hydraulic cylinder piston units 35 and 36. Thereby, the extrusion amount of the movable grate plate 6 can be continuously changed.

  Further, the hydraulic component is disposed away from the grate together with the structure of the driving device, and is not disposed directly below the grate. Each movable grate plate can be individually operated via a corresponding hydraulic cylinder piston unit. This hydraulic cylinder piston unit is fixed to the outer side wall 2 of the grate structure.

  FIG. 7 shows a cross section of the grate plate passage viewed from the rear of the movable grate plate 6 in the operation direction. The connecting rod 30 is hinged to a recess at the bottom of the movable grate plate 6. The connecting rod 30 is flexibly connected to a crank 31 positioned below the crankshaft 32 via a bolt 39. The crankshaft 32 is supported on the bushing 33 by a replaceable slide bearing 40. The bushing is firmly connected to the side wall 1 of the grate structure 2 via the blade strut 41. These blade struts 41 are incorporated and welded into the recesses of the side wall 1 or the side wall 2 in the grate structure. The drive is shown on the opposite side, where a crank 34 and a piston 35 are shown.

  FIG. 8 shows the configuration of the drive device when a plurality of grate passages 28 and 29 are arranged adjacent to each other. A water supply pipe for the movable grate plate 6 is indicated by reference numeral 43, and a drain pipe of the grate plate shown on the right side is indicated by reference numeral 44. The hydraulic cylinder 36 in the hydraulic drive device described above is arranged outside the first grate passage 28, but the movable grate plate 6 in the grate passage 29 connected to the outside of the first grate passage 28. Is placed underneath. In this case, the hydraulic cylinder 36 is further arranged farther from the movable grate plate 6 than the configuration described above. Further, the hydraulic cylinder 36 and its hydraulic feed pipe and drain pipe are surrounded by a steel case 42, so that the upper part is completely covered. Only the piston rod protrudes from the side surface of the steel metal case 42. In FIG. 8, the piston rod protrudes rearward from the steel metal case, thereby actuating the crank 34.

  As shown for each movable grate plate 6, such a drive can have a pair (overlapping) configuration. Moreover, a piston cylinder unit can be provided for each side surface of the grate passage. Furthermore, all the grate plates can be movable grate plates. Piston cylinder units can also be arranged in different directions depending on the state of the space. Each hydraulic cylinder can be arranged stepwise or can be arranged outside the side wall. In the case of vertically arranged cylinders, the crankshaft crank is rotated up to 90 degrees. In the case of a cylinder tilted at an angle of 45 degrees, the crank is correspondingly rotated up to 45 degrees as opposed to the configuration shown in the figure. In order to secure space, a plurality of arrays can be alternately selected.

It is a perspective view which shows the thrust combustion grate which removed a part of grate board. It is a longitudinal cross-sectional view which shows the conventional hydraulic drive device arrange | positioned under a grate passage and a grate passage. FIG. 2 is a cross-sectional view showing a grate framework and a grate lower structure excluding a grate plate, that is, a grate viewed from the front in FIG. 1. It is a front view which shows the supporting member assembled between two hollow profiles along a grate. It is a bottom view which shows a movable grate board. It is the perspective view which showed the outline of one hydraulic drive device, and looked at the movable grate board in this invention from diagonally upward. It is a cross-sectional view showing a grate passage having a hydraulic drive device outside the side wall for the grate plate located on the left side of the figure. It is a cross-sectional view showing two adjacent grate passages having a hydraulic drive device covered with a sheet metal case as a protective cover for the grate plate located on the left side of the figure.

Claims (7)

  Each movable grate plate (6) is connected to at least one connecting rod (30) supported at the end of the crank (31), and the corresponding crankshaft (32) is connected to the side wall (2) of the grate structure. The crank (34) supported by the bushing (33) passing through the cylinder and connected to the piston (35) of the hydraulic cylinder piston unit (36, 35) is located outside the grate structure of the associated grate passage. Hydraulic drive for water-cooled thrust combustion grate, fixed to the other side of the shaft (32).   The axis of the bushing (33) extends at right angles to the moving direction of the movable grate plate (6), and the crank (31) for the connecting rod (30) in the crankshaft (32). Is fixed to the other end of the crankshaft (32) for the piston (35) of the hydraulic cylinder piston unit (36, 35) by rotation of the crank (34) from 120 degrees to 180 degrees. The hydraulic drive apparatus for a water-cooled thrust combustion grate according to claim 1.   The bushing (33) includes a replaceable bearing (40) for the inserted crankshaft (32), and the crank (31, 34) is inserted into the end of the crankshaft to lock The hydraulic drive device for a water-cooled thrust combustion grate according to claim 1 or 2, wherein the hydraulic drive device is tightened by a nut.   The bushing (33) has at least two blade struts (41) extending radially, and the blade struts (41) are incorporated in the recesses of the side walls (1, 2) in the grate structure. The hydraulic drive device for a water-cooled thrust combustion grate according to any one of claims 1 to 3.   In the two grate passages (28, 29) arranged adjacent to each other, the hydraulic cylinder piston unit (36, 35) is arranged under the grate passage (29), and is similar to the hydraulic pipe line. 5. The upper part of the metal plate is also covered with a steel metal case (42), and only the piston rod (35) is exposed from the steel metal case (42). A hydraulic drive for the water-cooled thrust combustion grate as described.   The hydraulic drive device for a water-cooled thrust combustion grate according to any one of claims 1 to 5, wherein two hydraulic drive devices are provided for each movable grate plate (6). . The hydraulic system for a water-cooled thrust combustion grate according to any one of claims 1 to 6, wherein the piston cylinder unit of each hydraulic drive device is continuously arranged in different directions. Drive device.

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