Axial floating limit device for roller shaft of coke breaker

Abstract

An axial floating limit device for the roller shaft of a coke breaker, which relates to the technical field of reciprocating grate surface boilers. The invention is to solve the problem that one end of the coke breaker roller shaft of the existing boiler coke surface breaking device has no axial limit, and the axial force of the roller shaft directly acts on the bearing seat when it expands due to heat, causing the bearing seat to be seriously stressed. The invention comprises a bearing seat, a top cone, a bearing, a thrust shaft, a compression spring, a movable push plate, a fixed push plate and a limit box. The bearing seat is sleeved on the outer side of the roller shaft end, and the inner end surface of the limit box is open. A fixed push plate is vertically arranged in the limit box, and a movable push plate is arranged parallel to the outer side of the fixed push plate. The movable push plate is slidably connected to the inner side wall of the limit box, and a compression spring is arranged between the movable push plate and the fixed push plate. The middle part of the outer end surface of the movable push plate is vertically fixed with a thrust shaft, and the outer end of the thrust shaft is sleeved with a top cone, and a bearing is arranged between the top cone and the thrust shaft. The invention is used for boiler decoking.

Description

Technical Field

[0001] The invention relates to the technical field of reciprocating grate surface boilers, and in particular to an axial floating limiting device for a roller shaft of a coke breaker. Background Art

[0002] During the combustion process of a reciprocating grate boiler, when the boiler is burning for a long time or the coal used is of poor quality, a large amount of coke blocks will be generated at the slag discharge port at the end of the boiler grate. Moreover, the coke body is hard and not easy to fall off. The accumulated and increasingly thick coke surface will cause damage to the rear furnace wall of the boiler. In order to prevent the rear furnace wall from being damaged, the coke surface needs to be broken. The existing coke surface breaking device usually has a servo motor installed outside the boiler, a coke breaking roller shaft inserted into the boiler slag pit, and fins installed on the roller shaft. The coke breaking roller shaft is driven to rotate by the servo motor, and the fins press the coke blocks on the grate surface to make the coke blocks fall off. However, since the roller shaft is inserted into the boiler slag pit running at high temperature, thermal expansion and contraction will occur when breaking the coke surface. One end of the roller shaft has no axial limit, and the axial force of the roller shaft directly acts on the bearing seat, causing the bearing seat to be severely stressed. Summary of the invention

[0003] In order to solve the problem that one end of the coke breaking roller shaft of the existing boiler coke surface breaking device has no axial limit, the axial force of the roller shaft directly acts on the bearing seat when it expands due to heat, causing the bearing seat to be seriously stressed, and further proposes an axial floating limit device for the coke breaker roller shaft.

[0004] The technical solution adopted by the present invention to solve the above technical problems is:

[0005] An axial floating limit device for a coke breaker roller shaft comprises a bearing seat, a top cone, a bearing, a thrust shaft, a compression spring, a movable push plate, a fixed push plate and a limit box. The bearing seat is sleeved on the outer side of the roller shaft end, and the roller shaft and the bearing seat are slidably connected. The limit box is fixedly connected to the outer side of the bearing seat, and the inner end surface of the limit box is open. A fixed push plate is vertically arranged in the limit box, and a movable push plate is arranged parallel to and juxtaposed on the outer side of the fixed push plate. The movable push plate is slidably connected to the inner side wall of the limit box. A compression spring is arranged between the movable push plate and the fixed push plate. The thrust shaft is vertically fixedly connected to the middle part of the outer end surface of the movable push plate, and a top cone is sleeved on the outer end of the thrust shaft. A bearing is arranged between the top cone and the thrust shaft, and the outer tip of the top cone presses against the middle part of the outer end surface of the roller shaft end.

[0006] Furthermore, the bearing seat, top cone, thrust shaft, movable push plate, fixed push plate and limit box are all coaxially arranged with the roller shaft.

[0007] Furthermore, the limiting box is cylindrical in shape, and the fixed push plate and the movable push plate are both circular in shape.

[0008] Furthermore, an elastic force adjustment mechanism is provided between the fixed push plate and the limiting box.

[0009] Furthermore, the elastic force adjustment mechanism includes an adjusting screw, a nut and a turning handle. A through hole is provided in the middle of the outer end surface of the limit box, a nut is coaxially fixed to the outer side of the through hole, the middle part of the adjusting screw is horizontally inserted in the through hole and the nut, and the adjusting screw is threadedly connected to the nut, the inner end of the adjusting screw is vertically fixed to the middle part of the inner end of the fixed push plate, and the outer end of the adjusting screw is connected to the turning handle.

[0010] Furthermore, the bearing is a thrust ball bearing.

[0011] Furthermore, a mounting groove is provided on the inner end surface of the top cone, the outer end of the thrust shaft is inserted into the mounting groove, the outer end of the thrust shaft is provided with a stepped shaft end, the bearing is sleeved on the stepped shaft end, one end of the bearing cooperates with the shoulder of the stepped shaft end, and the other end of the bearing cooperates with the bottom of the mounting groove.

[0012] Furthermore, a mounting hole is provided on the upper portion of the bearing seat, a copper sleeve is fixed in the mounting hole, and the copper sleeve is sleeved on the outer side of the shaft end of the roller shaft.

[0013] Furthermore, a box support is fixedly connected to the lower portion of the limit box.

[0014] Furthermore, a plurality of balls are evenly embedded on the outer side wall of the movable push plate along the circumferential direction, and the balls are rollingly connected to the inner side wall of the limiting box.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The present invention proposes an axial floating limit device for the roller shaft of a coke breaker. The device adopts a bearing seat and a spring limit split structure. This structure is convenient for later maintenance and disassembly. The top cone contacts the end point of the shaft. A thrust bearing is arranged inside the top cone. As the shaft rotates, the top cone also rotates, effectively reducing friction. The force generated by the shaft will act on the split limit device, thereby reducing the force on the bearing seat and preventing damage to the bearing seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention. DETAILED DESCRIPTION

[0018] Specific implementation method 1: Combination Figure 1Describe this embodiment. The axial floating limit device of the roller shaft of a coke breaker described in this embodiment includes a bearing seat 1, a top cone 2, a bearing 3, a thrust shaft 4, a compression spring 5, a movable push plate 6, a fixed push plate 7 and a limit box 8. The bearing seat 1 is sleeved on the outer side of the shaft end of the roller shaft 9, and the roller shaft 9 is slidably connected to the bearing seat 1. The limit box 8 is fixedly connected to the outer side of the bearing seat 1, and the inner end surface of the limit box 8 is open. A fixed push plate 7 is vertically arranged in the limit box 8, and a movable push plate 6 is arranged in parallel on the outer side of the fixed push plate 7. The movable push plate 6 is slidably connected to the inner side wall of the limit box 8, and a compression spring 5 is arranged between the movable push plate 6 and the fixed push plate 7. The middle part of the outer end surface of the movable push plate 6 is vertically fixed with the thrust shaft 4, the outer end of the thrust shaft 4 is sleeved with a top cone 2, and a bearing 3 is arranged between the top cone 2 and the thrust shaft 4, and the outer tip of the top cone 2 presses against the middle part of the outer end surface of the shaft end of the roller shaft 9.

[0019] Under high temperature, the coke breaker roller shaft 9 rotates and moves toward the direction of the top cone 2. The top cone 2 rotates and drives the thrust ball bearing 3 to rotate. The top cone 2 pushes the thrust shaft 4 and the movable push plate 6 to move a certain distance, and compresses the compression spring 5 at the same time. When there is no axial force on the roller shaft 9, the force of the compression spring 5 pushes the coke breaker roller shaft 9 back to its original position.

[0020] Specific implementation method 2: Combination Figure 1 To explain this embodiment, the bearing seat 1, top cone 2, thrust shaft 4, movable push plate 6, fixed push plate 7 and limit box 8 in this embodiment are all coaxially arranged with the roller shaft 9. Other components and connection methods are the same as those in the first embodiment.

[0021] Specific implementation method three: Combination Figure 1 To explain this embodiment, the limiting box 8 of this embodiment is cylindrical in shape, and the fixed push plate 7 and the movable push plate 6 are both circular in shape. Other components and connection methods are the same as those of the second embodiment.

[0022] Specific implementation method four: Combination Figure 1 To explain this embodiment, an elastic force adjustment mechanism is provided between the fixed push plate 7 and the limit box 8. Other components and connection methods are the same as those of the third embodiment.

[0023] This design is used to adjust the preload force of the compression spring 5, thereby adjusting the thrust.

[0024] Specific implementation method five: Combination Figure 1This embodiment is described. The elastic force adjustment mechanism of this embodiment includes an adjustment screw 12, a nut 10 and a handle 11. A through hole 8-1 is provided in the middle of the outer end surface of the limit box 8. The outer side of the through hole 8-1 is coaxially fixed with a nut 10. The middle of the adjustment screw 12 is horizontally inserted into the through hole 8-1 and the nut 10, and the adjustment screw 12 is threadedly connected to the nut 10. The inner end of the adjustment screw 12 is vertically fixed to the middle of the inner end of the fixed push plate 7, and the outer end of the adjustment screw 12 is connected to the handle 11. Other components and connection methods are the same as those of the fourth embodiment.

[0025] Such a design adjusts the position of the fixed push plate 7 according to the axial displacement of the roller shaft 9 and the magnitude of the axial force, and further adjusts the preload force of the compression spring 5 so that the thrust force meets the use requirements.

[0026] During adjustment, the handle 11 is rotated to drive the screw 12 to rotate. The screw 12 is threadedly matched with the nut 10, and the screw 12 moves linearly in the horizontal direction, driving the fixed push plate 7 to move horizontally, thereby adjusting the distance between the fixed push plate 7 and the movable push plate 6 in the initial state, and then adjusting the pressure of the compression spring 5, and adjusting the thrust of the thrust shaft 4 and the top cone 2.

[0027] Specific implementation method six: Combination Figure 1 To explain this embodiment, the bearing 3 in this embodiment is a thrust ball bearing. Other components and connection methods are the same as those in the first embodiment.

[0028] Specific implementation method seven: Combination Figure 1 This embodiment is described. The inner end surface of the top cone 2 in this embodiment is provided with a mounting groove 2-1, the outer end of the thrust shaft 4 is inserted into the mounting groove 2-1, the outer end of the thrust shaft 4 is provided with a stepped shaft end 4-1, the bearing 3 is sleeved on the stepped shaft end 4-1, one end of the bearing 3 is matched with the shaft shoulder of the stepped shaft end 4-1, and the other end of the bearing 3 is matched with the groove bottom of the mounting groove 2-1. Other components and connection methods are the same as those of the specific embodiment 6.

[0029] The rolling connection between the top cone 2 and the thrust shaft 4 is designed in this way, which effectively reduces the friction between the two.

[0030] Specific implementation method eight: Combination Figure 1 To explain this embodiment, the upper part of the bearing seat 1 in this embodiment is provided with a mounting hole, a copper sleeve is fixed in the mounting hole, and the copper sleeve is sleeved on the outer side of the shaft end of the roller shaft 9. Other components and connection methods are the same as those in the first embodiment.

[0031] Specific implementation method nine: Combination Figure 1 To explain this embodiment, the lower part of the limit box 8 in this embodiment is fixedly connected with a box support 13. Other components and connection methods are the same as those in the first embodiment.

[0032] Specific implementation method ten: Combination Figure 1 To explain this embodiment, a plurality of balls are evenly embedded in the outer wall of the movable push plate 6 along the circumferential direction, and the balls are rollingly connected to the inner wall of the limit box 8. Other components and connection methods are the same as those of the first embodiment.

[0033] Such a design changes the sliding friction between the movable push plate 6 and the inner side wall of the limiting box body 8 into rolling friction, so as to reduce the friction force between the movable push plate 6 and the inner side wall of the limiting box body 8 .

[0034] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely examples of the principles and applications of the present invention. It should therefore be understood that many modifications may be made to the exemplary embodiments and that other arrangements may be devised without departing from the spirit and scope of the present invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in a manner different from that described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other described embodiments.

Claims

1. An axial floating limit device for a coke breaker roller shaft, characterized in that: It comprises a bearing seat (1), a top cone (2), a bearing (3), a thrust shaft (4), a compression spring (5), a movable push plate (6), a fixed push plate (7) and a limit box (8). The bearing seat (1) is sleeved on the outer side of the shaft end of the roller shaft (9). The roller shaft (9) and the bearing seat (1) are slidably connected. The limit box (8) is fixedly connected to the outer side of the bearing seat (1). The inner end surface of the limit box (8) is open. The fixed push plate (7) is vertically arranged in the limit box (8). The outer side of the fixed push plate (7) is parallel to the outer side of the roller shaft (9). A movable push plate (6) is arranged in parallel, the movable push plate (6) is slidably connected to the inner wall of the limit box (8), a compression spring (5) is arranged between the movable push plate (6) and the fixed push plate (7), a thrust shaft (4) is vertically fixedly connected to the middle of the outer end surface of the movable push plate (6), a top cone (2) is sleeved on the outer end of the thrust shaft (4), a bearing (3) is arranged between the top cone (2) and the thrust shaft (4), and the outer tip of the top cone (2) presses against the middle of the outer end surface of the roller shaft (9); the bearing (3) is a thrust ball bearing; The inner end surface of the top cone (2) is provided with a mounting groove (2-1), the outer end of the thrust shaft (4) is inserted into the mounting groove (2-1), the outer end of the thrust shaft (4) is provided with a stepped shaft end (4-1), the bearing (3) is sleeved on the stepped shaft end (4-1), one end of the bearing (3) is matched with the shaft shoulder of the stepped shaft end (4-1), and the other end of the bearing (3) is matched with the groove bottom of the mounting groove (2-1); a plurality of balls are evenly embedded in the outer wall of the movable push plate (6) along the circumferential direction, the balls are rollingly connected to the inner wall of the limit box (8), and the fixed push plate (7) is connected to the limit box. (8); the elastic force adjustment mechanism comprises an adjustment screw (12), a nut (10) and a rotating handle (11); a through hole (8-1) is provided in the middle of the outer end surface of the limit box (8); a nut (10) is coaxially fixedly connected to the outer side of the through hole (8-1); the middle of the adjustment screw (12) is horizontally inserted into the through hole (8-1) and the nut (10), and the adjustment screw (12) is threadedly connected to the nut (10); the inner end of the adjustment screw (12) is vertically fixedly connected to the middle of the inner end of the fixed push plate (7); and the outer end of the adjustment screw (12) is connected to the rotating handle (11); Under high temperature, the roller shaft (9) rotates and moves toward the top cone (2). The top cone (2) rotates and drives the thrust ball bearing to rotate. The top cone (2) pushes the thrust shaft (4) and the movable push plate (6) to move and compresses the compression spring (5). When there is no axial force on the roller shaft (9), the force of the compression spring (5) pushes the roller shaft (9) back to its original position.

2. According to claim 1, the axial floating limit device of the roller shaft of the coke breaker is characterized in that: The bearing seat (1), the top cone (2), the thrust shaft (4), the movable push plate (6), the fixed push plate (7) and the limit box (8) are all arranged coaxially with the roller shaft (9).

3. According to claim 2, the axial floating limit device of the roller shaft of the coke breaker is characterized in that: The limiting box (8) is cylindrical in shape, and the fixed push plate (7) and the movable push plate (6) are both circular in shape.

4. According to claim 1, the axial floating limit device of the roller shaft of the coke breaker is characterized in that: The upper part of the bearing seat (1) is provided with a mounting hole, in which a copper sleeve is fixedly connected, and the copper sleeve is sleeved on the outer side of the shaft end of the roller shaft (9).

5. According to claim 1, the axial floating limit device of the roller shaft of the coke breaker is characterized in that: A box support (13) is fixedly connected to the lower part of the limit box (8).

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