An angle-adjustable material spreading device for the preheater at the kiln tail

Abstract

The present invention discloses an angle-adjustable material spreading device for a preheater at the kiln tail, which comprises a box body, a handwheel, a transmission mechanism, a bracket and a material spreading plate. A bracket is arranged on the box body, and the handwheel is connected to the material spreading plate through the transmission mechanism. The transmission mechanism includes a driving shaft, bevel gears, a first gear bearing group, a second gear bearing group, a third gear bearing group, a transmission four-link rod and an eccentric wheel shaft. The handwheel is connected to the third gear bearing group, and the third gear bearing group, the second gear bearing group, the first gear bearing group and the bevel gears are meshed in sequence. The bevel gears are connected to the driving shaft, and the driving shaft is connected to the bracket through a bearing with a vertical seat. The driving shaft is connected to the eccentric wheel shaft through the transmission four-link rod at both ends, and the material spreading plate is connected to the box body through a rotating support. The present invention can realize online adjustment of the material spreading angle to meet different production requirements, is easy to operate for on-site workers, has an accurate adjustment range, high equipment reliability, achieves a good raw material dispersion effect, and improves the heat exchange efficiency.

Description

Technical Field

[0001] The present invention relates to a material spreading device, in particular to an angle-adjustable material spreading device for a kiln tail preheater. Background Art

[0002] In the kiln tail preheater system, the heat exchange between the air flow and the dispersed raw meal mainly takes place in the rising pipe. The degree to which the material spreading device spreads the raw meal affects the heat receiving area of the raw meal, and thus directly affects the heat exchange efficiency of the system. The material spreading plate in the material spreading device can achieve the best raw meal dispersion effect within a certain angle range.

[0003] The existing material spreading devices in cement production lines are mainly in the form of fixed material spreading plates and cannot be adjusted after installation. Most of the existing material spreading devices with angle adjustment functions use screw nuts or push rods for adjustment. Manual adjustment is laborious, the screw is prone to deformation under bending moment, and moreover, only the thread is used for self-locking, which is prone to failure and unreliable after long-term use under harsh working conditions, and the adjustment range is not precise. Summary of the Invention

[0004] Object of the Invention: In order to overcome the deficiencies in the prior art, the object of the present invention is to provide an angle-adjustable material spreading device for a kiln tail preheater that is convenient to adjust, avoids transmission dead points, has good reliability and stability.

[0005] Technical Solution: An angle-adjustable material spreading device for a kiln tail preheater according to the present invention includes a box body, a handwheel, a transmission mechanism, a bracket and a material spreading plate. A bracket is arranged on the box body, and the handwheel is connected to the material spreading plate through the transmission mechanism. The transmission mechanism includes a driving shaft, bevel gears, a first gear bearing group, a second gear bearing group, a third gear bearing group, a transmission four-link rod and an eccentric wheel shaft. The handwheel is connected to the third gear bearing group, and the third gear bearing group, the second gear bearing group, the first gear bearing group and the bevel gears are meshed in sequence. The bevel gears are connected to the driving shaft. The driving shaft is connected to the bracket through a bearing with a vertical seat. The driving shaft is connected to the eccentric wheel shaft through the transmission four-link rod at both ends. The eccentric wheel shaft is in clearance fit with the material spreading plate, and the material spreading plate is connected to the box body through a rotating support.

[0006] Further, the first gear bearing group includes a first support, a first shaft, a first bearing, a first large gear and a first small bevel gear. The first shaft is connected to the first support through the first bearing. The first large gear and the first small bevel gear are arranged on the first shaft, and the first small bevel gear is meshed with the bevel gears.

[0007] Further, the second gear bearing group includes a second support, a second shaft, a second bearing, a first small gear and a second large gear. The second shaft is connected to the second support through the second bearing. The first small gear and the second large gear are arranged on the second shaft, and the first small gear is meshed with the first large gear.

[0008] Further, the third gear bearing group includes a third support, a third shaft, a third bearing, a ratchet wheel, and a second pinion. The third shaft is connected to the third support through the third bearing. The ratchet wheel and the second pinion are arranged on the third shaft, and the second pinion meshes with the second large gear. The ratchet wheel is connected to the locking mechanism, and the locking mechanism is arranged on the mounting plate.

[0009] Further, the locking mechanism includes a handle, a cam, a first pawl, and a second pawl. The handle is connected to the cam. When the handle rotates, it drives the cam to rotate, and the cam can lift the first pawl or the second pawl. The locking mechanism is used to prevent the material spreading plate from reversing after being impacted and the misoperation of the staff, improving the reliability and stability of the equipment.

[0010] Further, the first gear bearing group, the second gear bearing group, and the third gear bearing group are arranged on the mounting plate, and the mounting plate is connected to the support through the mounting seat.

[0011] Further, the transmission four-bar link is connected to the eccentric shaft. The eccentric shaft is installed on the support through a bearing with a square seat. The sealing box is arranged on the surface of the box body at the two ends where the eccentric shaft passes through the box body to prevent air leakage and ash leakage.

[0012] Further, a material poking mechanism is arranged on the box body to clean the scale on the surface of the material spreading plate and prevent material accumulation.

[0013] Further, the rotating support includes a first fixed seat, a second fixed seat, a first connecting rod, a second connecting rod, and a third connecting rod. The first connecting rod is hinged to the first fixed seat, the second connecting rod is hinged to the second fixed seat, the third connecting rod is hinged to the first connecting rod and the second connecting rod, and the third connecting rod is connected to the material spreading plate.

[0014] Working principle: When the rotating handwheel is operated, it drives the third gear bearing group to rotate together. Through the meshing transmission between gears, it drives the second gear bearing group and the first gear bearing group to perform rotational motion, and drives the driving shaft in the vertical direction to rotate through bevel gears. Finally, it drives the eccentric shaft to rotate through the transmission four-bar link to realize the angle adjustment of the material spreading plate. Under normal conditions, the locking device locks the third gear bearing group. When adjustment is needed, turn the handle to the left or right. The cam installed on the handle lifts the left first pawl or the right second pawl to release the ratchet wheel, and forward or reverse adjustment can be realized.

[0015] Beneficial effects: Compared with the prior art, the present invention has the following significant features:

[0016] 1. It can realize the on-line adjustment of the material spreading angle to meet the requirements of different production working conditions, is easy for on-site workers to operate, the adjustment range is accurate, the adjustment accuracy ≤ ±0.5°, the equipment has high reliability, can achieve a good raw material dispersion effect, and meets the heat exchange requirements of the process production system;

[0017] 2. No adjustment tools are required on-site. After the rotating operation handwheel is decelerated by gears, it can easily drive the adjustment of the material spreading plate;

[0018] 3. Using two sets of staggered four-bar linkages can avoid the occurrence of dead points in transmission;

[0019] 4. A sealing box is provided at the place where the eccentric wheel shaft passes through the side wall of the box body, which is beneficial to preventing air leakage and dust leakage. The sealing box adopts an integral design, which is convenient for the disassembly and assembly of the eccentric wheel shaft;

[0020] 5. A locking device is provided on the third gear bearing group to prevent the feeding plate from reversing after being impacted and the misoperation of the staff, improving the reliability and stability of the equipment;

[0021] 6. The first gear bearing group, the second gear bearing group, the third gear bearing group and the bevel gear are provided to form a set of three-stage gear reduction mechanism, which can greatly save manpower and change the transmission direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a schematic structural diagram of the present invention;

[0023] Figure 2 is an exploded view of the present invention;

[0024] Figure 3 is a sectional view of the transmission mechanism 3 of the present invention;

[0025] Figure 4 is a schematic structural diagram of the present invention at the vertical seat bearing 6;

[0026] Figure 5 is a schematic structural diagram of the present invention at the square seat bearing 11;

[0027] Figure 6 is a partial enlarged view of the first gear bearing group 33, the second gear bearing group 34, and the third gear bearing group 35 of the present invention;

[0028] Figure 7 is a schematic diagram of the maximum adjustment angle of the present invention;

[0029] Figure 8 is a schematic diagram of the minimum adjustment angle of the present invention;

[0030] Figure 9 is a schematic structural diagram of the rotating support 7 of the present invention;

[0031] Figure 10 is a schematic structural diagram of the locking mechanism 8 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0032] As Figure 1, a support 4 is fixedly connected to a box body 1 of an angle-adjustable material spreading device for a kiln tail preheater, and a mounting seat 9 and a mounting plate 10 are fixedly connected to the support 4. The top of the box body 1 is a feed inlet, and a poking mechanism 13 which can be opened is obliquely arranged above the support 4 corresponding to a material spreading plate 5. A hand wheel 2 adjusts the tilt angle of the material spreading plate 5 through a transmission mechanism 3.

[0033] As Figures 2 - 3 , the transmission mechanism 3 includes a drive shaft 31, bevel gears 32, a gear bearing group I 33, a gear bearing group II 34, a gear bearing group III 35, a transmission four-bar linkage 36 and an eccentric wheel shaft 37. The gear bearing group I 33, the gear bearing group II 34, the gear bearing group III 35 and a locking device are installed on the mounting plate 10. The hand wheel 2 is installed on the gear bearing group III 35, and the gear bearing group III 35, the gear bearing group II 34, the gear bearing group I 33 and the bevel gears 32 are sequentially in a gear meshing relationship. The bevel gears 32 are fixedly connected to the drive shaft 31, and the drive shaft 31 is installed on two symmetrically arranged vertical seat bearings 6. The vertical seat bearings 6 are fixedly connected to the support 4. The drive shaft 31 is fixedly connected to the transmission four-bar linkages 36 at both ends. The transmission four-bar linkages 36 are fixedly connected to the eccentric wheel shaft 37. The eccentric wheel shaft 37 is installed on the support through a square seat bearing 11. A sealing box 12 is arranged at both ends of the eccentric wheel shaft 37 penetrating through the box body 1 on the surface of the box body 1. The sealing box 12 adopts an integral design, which is convenient for the disassembly and assembly of the eccentric wheel shaft 37. The eccentric wheel shaft 37 has a clearance fit with the material spreading plate 5. The material spreading plate 5 is hinged to a rotating support 7, and the rotating support 7 is fixedly connected to the box body 1. Two groups of transmission four-bar linkages 36 are provided and are arranged in a staggered manner by 90° in the transmission direction, which can avoid the occurrence of transmission dead points. As Figures 4 - 5 , both the vertical seat bearing 6 and the square seat bearing 11 are spherical roller bearings with good self-aligning performance, with an eccentric sleeve 14 and a set screw 15, which are easy to install and adjust. At the same time, they are equipped with a sealing device 16 and an oil cup 17, which are convenient for use and maintenance. The parallel-axis transmission gears of the transmission mechanism 3 are involute spur gears, with a reference circle tooth profile angle α = 20°, a addendum coefficient ha* = 1, and a clearance coefficient c* = 0.25. The intersecting-axis transmission gears are straight bevel gears, with a module m = 4, a pressure angle α = 20°, an addendum coefficient ha* = 1, and a clearance coefficient c* = 0.2. The total transmission ratio of the transmission mechanism 3 is designed in the range of 8 - 20 according to the specifications of the material spreading box.

[0034] As Figure 6, the first gear bearing set 33 includes a first support 331, a first shaft 332, a first bearing 333, a first large gear 334 and a small bevel gear 335. The first shaft 332 is rotatably connected to the first support 331 through the first bearing 333. The first large gear 334 and the small bevel gear 335 are fixedly arranged on the first shaft 332. The small bevel gear 335 meshes with the bevel gear 32. The second gear bearing set 34 includes a second support 341, a second shaft 342, a second bearing 343, a first small gear 344 and a second large gear 345. The second shaft 342 is rotatably connected to the second support 341 through the second bearing 343. The first small gear 344 and the second large gear 345 are fixedly arranged on the second shaft 342. The first small gear 344 meshes with the first large gear 334. The third gear bearing set 35 includes a third support 351, a third shaft 352, a third bearing 353, a ratchet 354 and a second small gear 355. The third shaft 352 is rotatably connected to the third support 351 through the third bearing 353. The ratchet 354 and the second small gear 355 are fixedly arranged on the third shaft 352. The second small gear 355 meshes with the second large gear 345. The ratchet 354 contacts the locking mechanism 8. The above 3 gear bearing sets and the bevel gear together form a three-stage gear reduction mechanism, which can greatly save manpower and change the transmission direction. When the handwheel 2 is operated to rotate, it drives the third gear bearing set 35 to rotate together. Through the meshing transmission between the gears, it drives the second gear bearing set 34 and the first gear bearing set 33 to perform rotational motion, and drives the drive shaft 31 in the vertical direction to rotate through the bevel gear 32. Finally, it drives the eccentric shaft 37 to rotate through the transmission four-link 36, realizing the angle adjustment of the spreading plate 5. The two-stage parallel shaft gear transmission formed by the first gear bearing set 33, the second gear bearing set 34 and the third gear bearing set 35 adopts involute spur cylindrical gears. The bevel gear 32 is preferably a straight bevel gear, with a lower processing cost. The material is selected as 42CrMo, and the surface hardness is improved by the high-frequency quenching treatment process.

[0035] As Figures 7 - 8 , the rotation of the eccentric shaft 37 pushes the spreading plate 5 to produce a pitching change in angle.

[0036] As Figure 9 , the rotating support 7 includes a first fixed seat 71, a second fixed seat 72, a first connecting rod 73, a second connecting rod 74 and a third connecting rod 75. The first connecting rod 73 is hinged to the first fixed seat 71. The second connecting rod 74 is hinged to the second fixed seat 72. The third connecting rod 75 is hinged to the first connecting rod 73 and the second connecting rod 74. The third connecting rod 75 is connected to the spreading plate 5.

[0037] As Figure 10, the locking mechanism 8 includes a handle 81, a cam 82, a first pawl 83 and a second pawl 84. The handle 81 is connected to the cam 82. Rotating the handle 81 drives the cam 82 to rotate, and the cam 82 can lift the first pawl 83 or the second pawl 84. The first pawl 83 and the second pawl 84 are bidirectional ratchets 354. Under normal conditions, the locking device locks the third gear bearing set 35. When adjustment is required, the handle 81 is turned left or right. The cam 82 mounted on the handle 81 lifts the first pawl 83 on the left or the second pawl 84 on the right to release the ratchet 354, and forward or reverse adjustment can be achieved. The tooth profiles of the first pawl 83 and the second pawl 84 are symmetric tooth profiles. Under the action of gravity, the first pawl 83 and the second pawl 84 lock the ratchet 354 to prevent rotation. The first pawl 83 and the second pawl 84 can be fixed on the ratchet 354 by the elastic force of a coil spring or a compression spring to achieve the purpose of locking.

Claims

1. An angle-adjustable material spreading device for the preheater at the kiln tail, characterized in that: It includes a box body (1), a handwheel (2), a transmission mechanism (3), a bracket (4) and a material spreading plate (5). A bracket (4) is arranged on the box body (1). The handwheel (2) is connected to the material spreading plate (5) through the transmission mechanism (3). The transmission mechanism (3) includes a driving shaft (31), bevel gears (32), a first gear bearing group (33), a second gear bearing group (34), a third gear bearing group (35), a transmission four-link (36) and an eccentric wheel shaft (37). The handwheel (2) is connected to the third gear bearing group (35). The third gear bearing group (35), the second gear bearing group (34), the first gear bearing group (33) and the bevel gears (32) are engaged in sequence. The bevel gears (32) are connected to the driving shaft (31). The driving shaft (31) is connected to the bracket (4) through a pedestal bearing with vertical seat (6). The driving shaft (31) is connected to the eccentric wheel shaft (37) through the transmission four-link (36) at both ends. The eccentric wheel shaft (37) is in clearance fit with the material spreading plate (5). The material spreading plate (5) is connected to the box body (1) through a rotating support (7). The third gear bearing group (35) includes a third support (351), a third shaft (352), a third bearing (353), a ratchet wheel (354) and a second small gear (355). The third shaft (352) is connected to the third support (351) through the third bearing (353). The ratchet wheel (354) and the second small gear (355) are arranged on the third shaft (352). The second small gear (355) is engaged with the second large gear (345) of the second gear bearing group (34). The ratchet wheel (354) is connected to a locking mechanism (8). The locking mechanism (8) is arranged on a mounting plate (10). The locking mechanism (8) includes a handle (81), a cam (82), a first pawl (83) and a second pawl (84). The handle (81) is connected to the cam (82). The rotation of the handle (81) drives the rotation of the cam (82). The cam (82) can lift the first pawl (83) or the second pawl (84). The rotating support (7) includes a first fixed seat (71), a second fixed seat (72), a first connecting rod (73), a second connecting rod (74) and a third connecting rod (75). The first connecting rod (73) is hinged to the first fixed seat (71). The second connecting rod (74) is hinged to the second fixed seat (72). The third connecting rod (75) is hinged to the first connecting rod (73) and the second connecting rod (74). The third connecting rod (75) is connected to the material spreading plate (5). The rotation of the eccentric wheel shaft (37) pushes the material spreading plate (5) to produce a pitching change in angle.

2. The angle-adjustable material spreading device for the kiln tail preheater according to claim 1, wherein: The first gear bearing group (33) includes a first support (331), a first shaft (332), a first bearing (333), a first large gear (334) and a small bevel gear (335). The first shaft (332) is connected to the first support (331) through the first bearing (333). The first large gear (334) and the small bevel gear (335) are arranged on the first shaft (332). The small bevel gear (335) is engaged with the bevel gears (32).

3. The angle-adjustable material spreading device for the preheater at the kiln tail according to claim 2, wherein: The second gear bearing set (34) includes a second support (341), a second shaft (342), a second bearing (343), a first pinion (344) and a second large gear (345). The second shaft (342) is connected to the second support (341) through the second bearing (343). The first pinion (344) and the second large gear (345) are arranged on the second shaft (342). The first pinion (344) meshes with the first large gear (334).

4. The angle-adjustable material spreading device for the preheater at the kiln tail according to claim 1, characterized in that: The first gear bearing set (33), the second gear bearing set (34) and the third gear bearing set (35) are arranged on the mounting plate (10). The mounting plate (10) is connected to the bracket (4) through the mounting seat (9).

5. The angle-adjustable material spreading device for the preheater at the kiln tail according to claim 1, characterized in that: The transmission four-link (36) is connected to the eccentric shaft (37). The eccentric shaft (37) is installed on the bracket (4) through the square seat bearing (11). The sealing box (12) is arranged at the two ends of the eccentric shaft passing through the surface of the box body (1).

6. The angle-adjustable material spreading device for the kiln tail preheater according to claim 1, characterized in that: A material poking mechanism (13) is arranged on the box body (1).

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