Sealing structure suitable for forward pushing fire grate of two-section type garbage incinerator

Abstract

The utility model relates to a garbage incinerator, and aims to provide a sealing structure suitable for a forward pushing fire grate of a two-section garbage incinerator, and the sealing structure has the characteristics of good sealing effect and wide application range. According to the technical scheme, the sealing structure suitable for the forward-pushing fire grate of the two-section type garbage incinerator comprises an upper heat preservation base, a lower heat preservation base and a sealing gasket, wherein the upper heat preservation base and the lower heat preservation base are installed on the upper side and the lower side of a transmission shaft and fixedly welded to a forward-pushing fire grate frame, and the sealing gasket is arranged in a cavity between the upper heat preservation base and the transmission shaft and between the lower heat preservation base and the transmission shaft. The sealing structure is characterized in that the sealing structure is further provided with an upper pressing ring and a lower pressing ring which are arranged on the surface of the transmission shaft in a sliding mode, and the ends, away from the forward pushing fire grate frame, of the two pressing rings are connected with the upper heat preservation base and the lower heat preservation base one by one through a plurality of stud assemblies; and the other ends of the elastic pieces are respectively inserted into the cavities one by one in a sliding manner and are propped against the sealing gasket, so that a tensile force is applied to the sealing gasket when the stud assembly is fastened.

Description

Technical Field

[0001] This utility model relates to a waste incinerator, specifically a sealing structure suitable for a two-stage waste incinerator with a forward-pushing grate. Background Technology

[0002] Mechanical reciprocating grates have become the mainstream technology for municipal solid waste incineration in my country due to their advantages such as large processing capacity, no need for pre-treatment of waste, complete and stable combustion, low fly ash, and low loss on ignition. Two-stage reciprocating grates, in particular, offer advantages such as small footprint, high mechanical load, and low ash leakage, contributing significantly to the resource utilization of municipal solid waste. In a two-stage waste incinerator, the forward-pushing grate is driven by a transmission shaft via hydraulic cylinders on both sides, which in turn drives the grate plate supports in a reciprocating motion. The grate plates on the supports also reciprocate. The transmission shaft is located inside the forward-pushing grate, with both ends passing through the grate frame partitions and connecting to cranks. Because the transmission shaft runs through the forward-pushing grate, and the grate is under positive pressure, primary hot air carries dust out. This results in high external temperatures for the forward-pushing grate, affecting the service life of the hydraulic cylinder sealing elements, and dust entering the sliding bearings, also impacting their lifespan.

[0003] In view of this, there is an urgent need to provide a sealing structure suitable for the forward-pushing grate of a two-stage waste incinerator, so as to effectively prevent air and ash leakage, and to be used for low-cost retrofitting of various projects. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of the above-mentioned background technology and provide a sealing structure suitable for the forward-pushing grate of a two-stage waste incinerator. This sealing structure should have the characteristics of sealing effect and wide application range.

[0005] The technical solution provided by this utility model is:

[0006] A sealing structure suitable for a two-stage waste incinerator with a forward-pushing grate includes an upper insulation seat and a lower insulation seat installed on the upper and lower sides of a drive shaft and welded to the forward-pushing grate frame, and a sealing gasket disposed in the cavity between the upper and lower insulation seats and the drive shaft. The sealing structure is characterized by: an upper clamping ring and a lower clamping ring slidably disposed on the surface of the drive shaft. The ends of the two clamping rings furthest from the forward-pushing grate frame are respectively connected to the upper and lower insulation seats one by one via several double-headed bolt assemblies, while the other ends are slidably inserted into the cavity and abut against the sealing gasket, thereby applying tension to the sealing gasket when the double-headed bolt assemblies are tightened.

[0007] The cavity is also provided with a corrugated plate, which is located between the upper and lower clamping rings and the sealing gasket in the axial direction and surrounds the entire circumference of the drive shaft, so as to form radial elongation deformation when subjected to axial pressure, thereby improving the sealing performance.

[0008] The radial connection between the heat insulation seat and the compression ring is provided with a venting groove arranged around the circumference. The upper heat insulation seat is provided with a compressed air blowpipe that connects the venting groove to an external air source. Both the upper and lower compression rings are provided with several pipe holes in the circumference that penetrate the venting groove and the inner circumferential wall, thereby creating a positive pressure environment on the surface of the drive shaft.

[0009] The corrugated plate is made of elastic polytetrafluoroethylene material, which can straighten and deform under pressure to form a tight seal barrier with the drive shaft.

[0010] The upper and lower insulation bases are also filled with insulation material.

[0011] The double-ended bolt assembly includes a double-ended bolt and a nut that mates with the double-ended bolt.

[0012] The beneficial effects of this utility model are: through practical application, this utility model has a good sealing effect, which can effectively prevent air and dust leakage, ensure the service life of the hydraulic cylinder sealing element and the transmission shaft sliding bearing, and can be used in new projects and can also be used for low-cost renovation of existing projects, with high prospects for promotion and application. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the main structure of an embodiment of the present utility model. Figure 5 (Enlarged view of part B in the image).

[0014] Figure 2 for Figure 1 Schematic diagram of the structure of the upper and lower clamping rings ( Figure 1 (Left-view direction view).

[0015] Figure 3 for Figure 1 A magnified structural diagram of part A in the diagram.

[0016] Figure 4 This is an exploded view of the sealing structure described in this utility model.

[0017] Figure 5 This is a schematic diagram of the forward-pushing grate structure of an existing two-stage waste incinerator.

[0018] The markings in the diagram are: 1. Upper insulation seat; 2. Lower insulation seat; 3. Upper clamping ring; 4. Lower clamping ring; 5. Drive shaft; 6. Forward push grate frame; 7. Crank; 8. Sealing gasket; 9. Corrugated plate; 10. Nut; 11. Double-ended bolt; 12. Insulation material; 13. Compressed air blowpipe; 14. Pipe hole; 15. Ventilation groove; 16. Grate plate bracket; 17. Grate plate. Detailed Implementation

[0019] The following description, in conjunction with the embodiments shown in the accompanying drawings, provides further details.

[0020] like Figure 5 , Figure 1 As shown, in the existing two-stage waste incinerator's forward-pushing grate, the two ends of the drive shaft 5 pass through the partitions of the forward-pushing grate frame 6 and are horizontally mounted on sliding bearings supported by the forward-pushing grate frame, and then connected to the crank. Hydraulic cylinders (omitted in the figure) arranged on both sides of the forward-pushing grate of the two-stage waste incinerator drive the drive shaft 5 to swing back and forth through the crank 7. The main body of the drive shaft 5 is located inside the forward-pushing grate, and the tie rod connecting the drive shaft is hinged to the grate plate bracket 16, on which grate plates 17 are arranged. When the drive shaft swings, it drives the grate plate bracket to reciprocate through the tie rod, and the grate plates arranged on the grate plate bracket also reciprocate accordingly, thus realizing the reciprocating motion of the forward-pushing grate.

[0021] The sealing structure of the aforementioned forward-pushing grate includes an upper insulation seat 1 and a lower insulation seat 2, and insulation material 12 (the insulation material is an aluminum silicate fiber blanket, used to isolate the internal high temperature from being conducted to the outside of the forward-pushing grate) respectively disposed in the upper and lower insulation seats; Figure 2 It can be seen that: both the upper and lower insulation seats have rectangular outlines and are welded and fixed to the push frame 6; the lower surface of the upper insulation seat has a semi-cylindrical groove with the opening facing downward, the groove is arranged coaxially with the drive shaft and the surface of the groove maintains a certain distance t with the surface of the drive shaft; correspondingly, the upper surface of the lower insulation seat has a semi-cylindrical groove with the opening facing upward, the groove is arranged coaxially with the drive shaft and the surface of the groove maintains a certain distance t with the surface of the drive shaft; in this way, the space between the semi-cylindrical groove of the upper insulation seat and the drive shaft, and the space between the semi-cylindrical groove of the lower insulation seat and the drive shaft are connected, and the cylindrical groove formed can serve as a cavity for accommodating the sealing gasket 8. Since the drive shaft runs through the frame of the forward-pushing grate, the leakage gaps caused by the wear of the sealing gaskets (preferably rubber gaskets) in the upper and lower insulation seats after a period of operation are significantly increased. In addition, the inside of the forward-pushing grate is under positive pressure, and the primary hot air inside the forward-pushing grate will carry dust out through the leakage gaps. On the one hand, this leads to a high external ambient temperature of the forward-pushing grate, which affects the service life of the hydraulic cylinder sealing elements. On the other hand, dust entering the sliding bearing affects the service life of the sliding bearing.

[0022] The improvement made by this utility model is that the provided sealing structure is further equipped with an upper clamping ring 3, a lower clamping ring 4, and several double-headed bolt assemblies. Figure 2 It can be seen that: the upper clamping ring 3 and the lower clamping ring 4 are both semi-circular cylindrical plates, and the radial thickness is less than the certain distance t (i.e., the distance between the groove of the upper or lower insulation seat and the surface of the drive shaft), preferably less than 0.5-1.0 mm; the semi-cylindrical concave surface of the upper clamping ring faces downward, and the concave surface is compatible with the upper half surface profile of the drive shaft; the structure of the lower clamping ring is the same as that of the upper clamping ring: that is, the semi-cylindrical concave surface of the lower clamping ring faces upward, and the concave surface is compatible with the lower half surface profile of the drive shaft; in this way, the upper and lower clamping rings can be slidably inserted into the cavities in the upper and lower insulation seats in the axial direction to apply axial pressure to the sealing gasket.

[0023] Furthermore, the upper and lower clamping rings, at their ends furthest from the forward-pushing grate frame, are respectively provided with semi-circular flanges with several through holes; and the upper and lower insulation seats, facing the flanges, are respectively provided with several (preferably four) screw holes, the axes of the screw holes corresponding one-to-one with the axes of the through holes and parallel to the axis of the drive shaft; the double-ended bolt assembly includes a double-ended bolt 11 and a nut 10, one end of the double-ended bolt passes through the through hole and is fastened to the screw hole, and the nut is tightened on the other end of the double-ended bolt to press against the upper or lower clamping ring (the tightening force is controlled by adjusting the nut), thereby applying pressure to the sealing gasket as the first sealing barrier.

[0024] Furthermore, a corrugated plate is also provided in the cavity, and the corrugated plate is located in the cavity of the aforementioned upper and lower insulation seats. Figure 3 The corrugated plate is positioned along the axis of the upper and lower insulation seats (left-right direction, i.e., the axis of the upper and lower insulation seats), with the corrugated plate abutting against the right end of the compression ring and the left end of the sealing gasket, respectively, and encircling the entire circumference of the drive shaft. This allows the corrugated plate to elongate and deform radially when subjected to axial pressure, thus abutting against the surface of the drive shaft and improving sealing performance. The corrugated plate is preferably made of elastic polytetrafluoroethylene (PTFE) (the friction coefficient between the sealing gasket and PTFE is low compared to steel, so it will not affect the free rotation of the drive shaft), allowing it to straighten and deform under pressure and tightly adhere to the drive shaft, forming another sealing barrier.

[0025] Furthermore, the upper and lower insulation seats are also equipped with a positive pressure sealing structure. In this positive pressure sealing structure, the ventilation groove 15 is provided at the radial connection between the upper insulation seat and the upper compression ring, and at the connection between the lower insulation seat and the lower compression ring, and is arranged around the circumference. The upper insulation seat is equipped with a compressed air blowpipe 13, which connects the ventilation groove to an external air source (preferably an in-plant compressed air station). The upper compression ring 3 and the lower compression ring 4 are both provided with several pipe holes 14 in the circumferential direction. These pipe holes penetrate the ventilation groove and the inner circumferential wall of the upper and lower compression rings. Compressed air can enter the furnace along this path, thereby forming a positive pressure environment on the surface of the drive shaft to prevent heat loss and forming a third sealing barrier. It can also cool the drive shaft and ensure the service life of the hydraulic cylinder sealing elements.

Claims

1. A sealing structure suitable for a two-stage waste incinerator with a forward-pushing grate, comprising an upper insulation seat (1) and a lower insulation seat (2) installed on the upper and lower sides of a drive shaft (5) and welded to the forward-pushing grate frame (6), and a sealing gasket (8) disposed in the cavity between the upper and lower insulation seats and the drive shaft, characterized in that: The sealing structure is also equipped with an upper clamping ring (3) and a lower clamping ring (4) that are slidably disposed on the surface of the drive shaft. The ends of the two clamping rings that are away from the forward-pushing grate frame are respectively connected to the upper and lower insulation seats one by one through several double-headed bolt assemblies, and the other ends are respectively slidably inserted into the cavity and abut against the sealing gasket, so as to apply tension to the sealing gasket when the double-headed bolt assembly is tightened.

2. The sealing structure applicable to the forward-pushing grate of a two-stage waste incinerator according to claim 1, characterized in that: The cavity is also provided with a corrugated plate (9), which is located between the upper and lower pressure rings and the sealing gasket in the axial direction and surrounds the entire circumference of the drive shaft, so as to form radial elongation deformation when subjected to axial pressure to improve sealing performance.

3. The sealing structure applicable to the forward-pushing grate of a two-stage waste incinerator according to claim 2, characterized in that: The radial connection between the heat insulation seat and the compression ring is provided with a ventilation groove (15) arranged around the circumference. The upper heat insulation seat is provided with a compressed air blow pipe (13) that connects the ventilation groove with an external air source. Both the upper and lower compression rings are provided with several pipe holes (14) that penetrate the ventilation groove and the inner circumferential wall in the circumferential direction, thereby forming a positive pressure environment on the surface of the drive shaft.

4. The sealing structure applicable to the forward-pushing grate of a two-stage waste incinerator according to claim 3, characterized in that: The corrugated plate is made of elastic polytetrafluoroethylene material, which can straighten and deform under pressure to form a tight seal barrier with the drive shaft.

5. The sealing structure applicable to the forward-pushing grate of a two-stage waste incinerator according to claim 4, characterized in that: The double-ended bolt assembly includes a double-ended bolt (11) and a nut that mates with the double-ended bolt.

6. The sealing structure applicable to the forward-pushing grate of a two-stage waste incinerator according to claim 5, characterized in that: The upper and lower insulation seats are also filled with insulation material (12).

Images