CN220601554U - Fire-proof access door of stokehold feeder of biomass boiler - Google Patents

Abstract

The utility model belongs to the technical field of biomass boilers, and particularly relates to a fireproof access door of a stokehold feeder of a biomass boiler, which comprises the following components: the frame, vertical sliding connection has the door body in the frame, and the top of frame is provided with hoist mechanism, and hoist mechanism is connected with the door body transmission, and the bottom of frame can be dismantled and be connected with a plurality of ash discharging doors, is provided with relaxation mechanism between frame and the door body, is provided with cooling body in the door body. Before overhauling the stokehole feeder, firstly, the distance between the door body and the frame is increased through a loosening mechanism, so that the door body can be lifted or lowered in the frame conveniently, and then, the door body is lifted through a lifting mechanism, so that the water cooling jacket is isolated from the stokehole feeder; and meanwhile, the cooling mechanism absorbs the heat and radiant heat of the flue gas emitted by the combustion cavity, so that the radiant heat of the combustion cavity is further prevented from entering the stokehold feeder, and the safety of workers is further prevented.

Description

Fire-proof access door of stokehold feeder of biomass boiler

Technical Field

The utility model belongs to the technical field of biomass boilers, and particularly relates to a fireproof access door of a stokehold feeder of a biomass boiler.

Background

Biomass boilers are a kind of boilers, and boilers using biomass energy as fuel are called biomass boilers and are classified into biomass steam boilers, biomass hot water boilers, biomass hot blast stoves, biomass heat conduction oil boilers, vertical biomass boilers, horizontal biomass boilers and the like.

The biomass boiler is fed through a stokehold feeder generally, when the stokehold feeder is repaired without stopping the boiler, in order to ensure the safety of workers, a combustion cavity of the stokehold feeder and the biomass boiler is required to be cut off, radiant heat and combustion flue gas are prevented from spreading into the stokehold feeder, damage is caused to the workers, and therefore a fireproof access door of the stokehold feeder of the biomass boiler is required to cut off the combustion cavity of the stokehold feeder and the biomass boiler, and radiant heat and combustion flue gas are prevented from spreading into the stokehold feeder.

Disclosure of Invention

The utility model aims to provide a fire-proof access door of a stokehold feeder of a biomass boiler so as to solve the problems.

In order to achieve the above object, the present utility model provides the following solutions:

a fire protection access door for a stokehold feeder of a biomass boiler, comprising: the frame, vertical sliding connection has the door body in the frame, the top of frame is provided with elevating system, elevating system with door body transmission is connected, the bottom of frame can be dismantled and be connected with a plurality of ash discharging door, and a plurality of ash discharging doors are located respectively the front and back both sides of frame, opposite both sides all are provided with relaxation mechanism in the frame, the door body is located two between the relaxation mechanism, the lower part of the door body is provided with cooling body.

Preferably, the first through grooves are formed in two opposite inner side walls of the frame, the first through grooves are close to the top end of the frame, connecting lugs are connected in the first through grooves in a sliding mode, one ends of the connecting lugs extend into the frame and are fixedly connected to the top end of the door body, and the other ends of the connecting lugs penetrate out of the frame and are in transmission connection with the lifting mechanism.

Preferably, the lifting mechanism comprises a double-shaft motor fixedly connected to the top end of the frame, connecting shafts are coaxially fixedly connected to two ends of an output shaft of the double-shaft motor, one end of each connecting shaft, which is far away from the double-shaft motor, is coaxially fixedly connected with an input shaft of a speed reducer, the speed reducer is fixedly connected to the top end of the frame, a chain wheel is coaxially fixedly connected to the output shaft of the speed reducer, the chain wheel is connected with another chain wheel through chain transmission, the other chain wheel is rotatably connected to one side of the frame through a mounting seat, a connecting seat is fixedly connected to the chain, and the connecting seat is fixedly connected with one end of the frame, which extends out of the connecting lug.

Preferably, the middle part of the frame is fixedly connected with two first cross bars, the first cross bars are horizontally arranged, the two first cross bars are respectively positioned at the front side and the rear side of the door body, the loosening mechanism comprises two loosening components, the two loosening components are respectively positioned on the two first cross bars and are arranged at the same side, the loosening components comprise a loosening rotating shaft which is rotationally connected with one end of the first cross bars, the loosening rotating shaft is vertically arranged, the bottom end of the loosening rotating shaft penetrates out of the first cross bars and is rotationally connected with a rotating seat, the rotating seat is fixedly connected on the inner side wall of the frame, a bulge is fixedly connected on the outer side wall of the loosening rotating shaft, and the bulge is in butt joint with the bulge of the other loosening component; the top end of the loosening rotary shaft penetrates out of the first cross rod and is fixedly connected with a loosening rod, the loosening rod is vertically arranged with the loosening rotary shaft, a limiting seat is fixedly connected to the top surface of the first cross rod, and the limiting seat is in limiting contact with the loosening rod.

Preferably, two second cross bars are fixedly connected in the frame, the two second cross bars are respectively positioned at two sides of the door body, a space is reserved between the second cross bars and the first cross bars, the space is correspondingly arranged with a furnace mouth of the biomass boiler, a space is reserved between the second cross bars and the bottom wall of the frame, a plurality of ash discharging doors are positioned between the second cross bars and the bottom wall of the frame and are distributed at equal intervals along the width direction of the frame, and the ash discharging doors are connected with the frame through bolts.

Preferably, the door body comprises a connecting plate, two connecting lugs are fixedly connected to two ends of the top surface of the connecting plate respectively, the connecting lugs are arranged along the length direction of the connecting plate, and the connecting lugs extend out of the connecting plate;

the biomass boiler is characterized in that two ends of the connecting plate are fixedly connected with water outlet pipes which are vertically arranged, the connecting plate is located at the top ends of the water outlet pipes, the cooling mechanism is arranged between the two bottom ends of the water outlet pipes, a distance is reserved between the cooling mechanism and the connecting plate, and the distance is arranged corresponding to a furnace mouth of the biomass boiler.

Preferably, the cooling mechanism comprises a second water pipe fixedly connected between two water outlet pipes, the second water pipe is horizontally arranged and communicated with the two water outlet pipes, two baffles are fixedly connected in the second water pipe, the two baffles divide the second water pipe into two water return cavities and one water inlet cavity, the water inlet cavity is positioned between the two water return cavities, a water inlet is fixedly connected at the bottom end of the second water pipe, the water inlet is communicated with the water inlet cavity, the water inlet is communicated with a water inlet pipe, a plurality of water inlet heat pipes and a plurality of water outlet heat pipes are fixedly connected at the top end of the second water pipe, the water inlet heat pipes are communicated with the water inlet cavity, the water outlet heat pipes are respectively communicated with the two water return cavities, the water inlet heat pipes and the top ends of the water outlet heat pipes are respectively communicated with a first water pipe, the first water pipe is horizontally fixedly connected between the two water outlet pipes, and the distance is reserved between the first water pipe and the connecting plate.

Preferably, a rib plate is fixedly connected between the top surface of the first water pipe and the water outlet pipe.

Compared with the prior art, the utility model has the following advantages and technical effects:

the fire-proof access door is positioned between a stokehold feeder of a biomass boiler and a water cooling jacket; before overhauling the stokehole feeder, firstly, the distance between the door body and the frame is increased through adjusting the loosening mechanism, so that particles between the door body and the frame fall down, the door body is convenient to lift or descend in the frame, and then, the door body is lifted through the lifting mechanism, so that the water cooling jacket is isolated from the stokehole feeder; simultaneously absorb the heat and the radiant heat of the flue gas that burn the chamber and scatter through cooling body, further avoid the radiant heat in burning chamber to get into in the stokehold batcher, influence staff's safety, overhaul the back of accomplishing, staff's withdrawal stokehold batcher, put down the door body through elevating system, then reset relaxation mechanism.

Drawings

For a clearer description of an embodiment of the utility model or of the solutions of the prior art, the drawings that are needed in the embodiment will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art:

FIG. 1 is a front view of the present utility model;

FIG. 2 is a right side view of the present utility model;

FIG. 3 is a schematic diagram of the releasing mechanism according to the present utility model;

FIG. 4 is a schematic view of a door body according to the present utility model;

FIG. 5 is a schematic view of the installation of the present utility model;

wherein, 1, a frame; 2. a door body; 3. a chain; 4. a biaxial motor; 5. a connecting shaft housing; 6. a speed reducer; 7. a connecting seat; 8. a mounting base; 9. a limiter; 10. a connecting lug; 11. a protrusion; 12. a first cross bar; 14. an ash discharging door; 15. a second cross bar; 16. a sprocket; 17. a rotating seat; 18. loosening the rotating shaft; 19. releasing the gear lever; 20. a limit seat; 201. a connecting plate; 202. a water outlet; 203. high temperature resistant water outlet pipe; 204. a water outlet pipe; 205. rib plates; 206. a first water pipe; 207. a water inlet heat conduction pipe; 208. a water outlet heat conduction pipe; 209. a second water pipe; 210. a water inlet; 211. a water inlet pipe; 212. a baffle; 21. a stokehold feeder; 22. and (5) a water cooling jacket.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In order that the above-recited objects, features and advantages of the present utility model will become more readily apparent, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description.

Referring to fig. 1 to 4, the utility model discloses a fire-proof access door of a stokehold feeder of a biomass boiler, comprising: the frame 1, vertical sliding connection has a door body 2 in the frame 1, and the top of frame 1 is provided with elevating system, and elevating system is connected with door body 2 transmission, and the bottom of frame 1 can be dismantled and be connected with a plurality of ash discharging door 14, and a plurality of ash discharging door 14 are located the front and back both sides of frame 1 respectively, and the opposite both sides all are provided with relaxation mechanism in the frame 1, and door body 2 is located between two relaxation mechanisms, and the lower part of door body 2 is provided with cooling body.

Referring to fig. 5, the fire protection access door of the present utility model is located between a stokehold feeder 21 and a water jacket 22 of a biomass boiler; before the front feeder 21 is overhauled, the space between the door body 2 and the frame 1 is increased through a loosening mechanism, so that particles between the door body 2 and the frame 1 fall down, the door body 2 is lifted or lowered in the frame 1 conveniently, the particles between the door body and the frame fall down, and then the door body 2 is lifted through a lifting mechanism, so that the front feeder 21 is isolated from the front feeder 22; simultaneously absorb the heat and the radiant heat of the flue gas that burn the chamber and scatter through cooling body, further avoid the radiant heat in burning chamber to get into in the stokehold batcher 21, influence staff's safety, overhaul the back of accomplishing, staff's withdrawal stokehold batcher 21, put down the door body 2 through elevating system, then make relaxation mechanism reset.

Further optimizing scheme has all seted up the first logical groove of vertical setting on two relative inside walls of frame 1, and first logical groove is close to the top of frame 1, and first logical inslot sliding connection has engaging lug 10, and the one end of engaging lug 10 stretches into in the frame 1 and the rigid coupling is on the top of the door body 2, and the other end of engaging lug 10 wears out frame 1 and is connected with the hoist mechanism transmission.

The two opposite inner side walls of the frame 1 are also provided with a second chute which is arranged along the height direction of the frame 1 and is communicated with the first through groove, the door body 2 is slidably connected in the second chute, a gap is reserved between the door body 2 and the second chute, and when a loosening mechanism acts on the door body 2, the door body 2 displaces in the second chute, so that dust and particles between the door body 2 and the second chute fall between the ash discharge doors 14 below.

The lifting mechanism drives the two connecting lugs 10 to lift, and then drives the door body 2 to lift so as to isolate the water cooling jacket 22 from the stokehole feeder 21.

Further optimizing scheme, elevating system includes the rigid coupling at the biax motor 4 on frame 1 top, the equal coaxial rigid coupling in output shaft both ends of biax motor 4 has the connecting axle, the coaxial rigid coupling of one end that the biax motor 4 was kept away from to the connecting axle has the input shaft of reduction gear 6, the coaxial rigid coupling of reduction gear 6 is on the top of frame 1, coaxial rigid coupling has sprocket 16 on the output shaft of reduction gear 6, sprocket 16 is connected with another sprocket 16 through the transmission of chain 3, another sprocket 16 rotates through mount pad 8 and connects in one side of frame 1, the rigid coupling has connecting seat 7 on the chain 3, connecting seat 7 stretches out the one end rigid coupling of frame 1 with engaging lug 10.

The double-shaft motor 4 drives the two reducers 6 to work through a connecting shaft, so as to drive the door body 2 to ascend or descend, a connecting rod is fixedly connected to the connecting seat 7, limiters 9 are fixedly connected to the top end and the middle of the frame 1, the connecting rod is positioned between the two limiters 9, and when the connecting rod moves to the top end along with the chain 3 to contact with the limiters 9, the door body 2 is lifted to the top end, and the water cooling jacket 22 is isolated from the stokehold feeder 21; when the connecting rod moves to the bottom end along with the chain 3 to contact with the other limiter 9, the door body 2 descends to the bottommost end, and the water cooling jacket 22 is communicated with the stokehole feeder 21. The outer side of the connecting shaft is covered with a connecting shaft cover shell 5, and the connecting shaft cover shell 5 is fixedly connected with the top end of the frame 1.

In a further optimization scheme, two first cross bars 12 are fixedly connected to the middle of the frame 1, the first cross bars 12 are horizontally arranged, the two first cross bars 12 are respectively located on the front side and the rear side of the door body 2, the loosening mechanism comprises two loosening components, the two loosening components are respectively located on the two first cross bars 12 and are arranged on the same side, the loosening components comprise a loosening rotating shaft 18 which is rotatably connected to one end of the first cross bars 12, the loosening rotating shaft 18 is vertically arranged, the bottom end of the loosening rotating shaft 18 penetrates out of the first cross bars 12 and is rotatably connected with a rotating seat 17, the rotating seat 17 is fixedly connected to the inner side wall of the frame 1, a protrusion 11 is fixedly connected to the outer side wall of the loosening rotating shaft 18, and the protrusion 11 is abutted to the protrusion 11 of the other loosening component; the top end of the loosening rotary shaft 18 penetrates out of the first cross rod 12 and is fixedly connected with a loosening stop lever 19, the loosening stop lever 19 is vertically arranged with the loosening rotary shaft 18, the top surface of the first cross rod 12 is fixedly connected with a limiting seat 20, and the limiting seat 20 is in limiting contact with the loosening stop lever 19.

The frame 1 includes preceding frame and back frame, preceding frame and back frame parallel and symmetry set up, form frame 1 together through the fixed plate rigid coupling of both sides between preceding frame and the back frame, one of them first horizontal pole 12 rigid coupling is in the centre department of preceding frame, another first horizontal pole 12 rigid coupling is in the centre department of back frame, two first horizontal poles 12 are located same horizontal plane, the both ends of first horizontal pole 12 rotate respectively and are connected with relax pivot 18, drive through pulling relax shelves pole 19 and relax pivot 18 and rotate, and then drive the butt between two archs 11 that are located the homonymy, thereby increase the distance between frame 1 preceding frame and the back frame, the door body 2 of being convenient for reciprocates and opens and shuts.

The door body 2 is positioned between the two loosening shafts 18 at both ends of the first cross bar 12 without interference.

Further optimizing scheme, fixedly connected with two second horizontal poles 15 in the frame 1, two second horizontal poles 15 are located the both sides of the door body 2 respectively, leave the interval between second horizontal pole 15 and the first horizontal pole 12, and the interval corresponds the setting with biomass boiler's fire door, leaves the interval between the diapire of second horizontal pole 15 and frame 1, and a plurality of ash discharging doors 14 are located between the diapire of second horizontal pole 15 and frame 1 and along the equidistant distribution of the width direction of frame 1, and ash discharging doors 14 pass through the bolt and are connected with frame 1.

The ash discharging door 14 is detachably connected between the second cross bar 15 and the bottom wall of the frame 1, when sundries (dust and particulate matters) among the ash discharging doors 14 are too much, the ash discharging door 14 can be detached to clean the sundries, and the ash discharging door 14 is installed after cleaning is finished. The ash discharge door 14 also has the function of protecting the door body 2.

The stokehold feeder 21 and the water jacket 22 are fixedly connected to two opposite sides of the frame 1 respectively and are communicated with the first cross bar 12 through the interval between the second cross bar 15.

In a further optimized scheme, the door body 2 comprises a connecting plate 201, two connecting lugs 10 are fixedly connected to two ends of the top surface of the connecting plate 201 respectively, the connecting lugs 10 are arranged along the length direction of the connecting plate 201, and the connecting lugs 10 extend out of the connecting plate 201;

the two ends of the connecting plate 201 are fixedly connected with water outlet pipes 204 which are vertically arranged, the connecting plate 201 is positioned at the top ends of the water outlet pipes 204, the cooling mechanism is arranged between the bottom ends of the two water outlet pipes 204, a distance is reserved between the cooling mechanism and the connecting plate 201, and the distance is correspondingly arranged with the furnace mouth of the biomass boiler.

The distance between the cooling mechanism and the connection plate 201 is adapted to the distance between the second rail 15 and the first rail 12.

Further optimizing scheme, cooling mechanism includes the second raceway 209 of rigid coupling between two outlet pipes 204, the second raceway 209 level sets up and communicates with two outlet pipes 204, the one side intercommunication that the top of outlet pipe 204 kept away from connecting plate 201 has delivery port 202, delivery port 202 intercommunication has high temperature resistant outlet pipe 203, the rigid coupling has two baffles 212 in the second raceway 209, two baffles 212 divide into two water return cavities and a water inlet cavity in with second raceway 209, the water inlet cavity is located between two water return cavities, the bottom rigid coupling of second raceway 209 has water inlet 210, water inlet 210 communicates with the water inlet cavity, water inlet 210 communicates there is inlet tube 211, the top rigid coupling of second raceway 209 has a plurality of water inlet heat pipes 207 and a plurality of water outlet heat pipes 208, a plurality of water inlet heat pipes 207 all communicate with the water inlet cavity, a plurality of water outlet heat pipes 208 communicate with two water return cavities respectively, a plurality of water inlet heat pipes 207, the top of a plurality of water outlet heat pipes 208 communicate with first raceway 206 respectively, first raceway 206 level rigid coupling leaves the distance between two water outlet pipes 204.

Cold water enters the water inlet cavity in the second water conveying pipe 209 through the water inlet 210 communicated with the water inlet pipe 211, then enters the water inlet heat conducting pipe 207, water in the water inlet heat conducting pipe 207 enters the water outlet heat conducting pipes 208 positioned on two sides of the plurality of water inlet heat conducting pipes 207 through the first water conveying pipe 206, water in the water outlet heat conducting pipes 208 flows into the water return cavity in the second water conveying pipe 209, water in the water return cavity flows into the water outlet pipe 204, and flows into the high-temperature-resistant water outlet pipe 203 through the water outlet 202 at the top end of the water outlet pipe 204.

Further optimizing scheme, the rib plate 205 is fixedly connected between the top surface of the first water conveying pipe 206 and the water outlet pipe 204.

So arranged, the structural strength of the door body 2 is enhanced.

In the description of the present utility model, it should be understood that the terms "longitudinal," "transverse," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

The above embodiments are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model should fall within the protection scope defined by the claims of the present utility model without departing from the design spirit of the present utility model.

Claims (8)

1. A fire protection access door for a stokehold feeder of a biomass boiler, comprising: the novel dust collector comprises a frame (1), wherein a door body (2) is vertically and slidably connected in the frame (1), a lifting mechanism is arranged at the top end of the frame (1), the lifting mechanism is in transmission connection with the door body (2), a plurality of dust discharging doors (14) are detachably connected to the bottom end of the frame (1), the dust discharging doors (14) are respectively located at the front side and the rear side of the frame (1), loosening mechanisms are respectively arranged at the opposite sides in the frame (1), the door body (2) is located between the loosening mechanisms, and a cooling mechanism is arranged at the lower part of the door body (2).

2. A biomass boiler stokehold feeder fire protection access door as defined in claim 1, wherein: the lifting mechanism comprises a frame (1), wherein two opposite inner side walls of the frame (1) are respectively provided with a first through groove which is vertically arranged, the first through grooves are close to the top end of the frame (1), a connecting lug (10) is connected in a sliding manner in the first through grooves, one end of the connecting lug (10) stretches into the frame (1) and is fixedly connected with the top end of the door body (2), and the other end of the connecting lug (10) penetrates out of the frame (1) and is in transmission connection with the lifting mechanism.

3. A biomass boiler stokehold feeder fire protection access door as claimed in claim 2, wherein: the lifting mechanism comprises a double-shaft motor (4) fixedly connected to the top end of the frame (1), connecting shafts are coaxially fixedly connected to the two ends of an output shaft of the double-shaft motor (4), the connecting shafts are far away from an input shaft of a speed reducer (6) which is coaxially fixedly connected to one end of the double-shaft motor (4), the speed reducer (6) is fixedly connected to the top end of the frame (1), a chain wheel (16) is coaxially fixedly connected to the output shaft of the speed reducer (6), the chain wheel (16) is connected with the other chain wheel (16) through a chain (3) in a transmission manner, the other chain wheel (16) is rotatably connected to one side of the frame (1) through a mounting seat (8), a connecting seat (7) is fixedly connected to the chain (3), and the connecting seat (7) and the connecting lug (10) extend out of one end of the frame (1) in a fixedly connected manner.

4. A biomass boiler stokehold feeder fire protection access door as defined in claim 1, wherein: the middle of the frame (1) is fixedly connected with two first cross bars (12), the first cross bars (12) are horizontally arranged, the two first cross bars (12) are respectively positioned on the front side and the rear side of the door body (2), the loosening mechanism comprises two loosening components, the two loosening components are respectively positioned on the two first cross bars (12) and are arranged on the same side, the loosening components comprise a loosening rotating shaft (18) which is rotationally connected with one end of the first cross bars (12), the loosening rotating shaft (18) is vertically arranged, the bottom end of the loosening rotating shaft (18) penetrates out of the first cross bars (12) and is rotationally connected with a rotating seat (17), the rotating seat (17) is fixedly connected on the inner side wall of the frame (1), a bulge (11) is fixedly connected on the outer side wall of the loosening rotating shaft (18), and the bulge (11) is in butt with the bulge (11) of the other loosening component; the top of the loosening rotary shaft (18) penetrates out of the first cross rod (12) and is fixedly connected with a loosening stop rod (19), the loosening stop rod (19) is vertically arranged with the loosening rotary shaft (18), a limiting seat (20) is fixedly connected to the top surface of the first cross rod (12), and the limiting seat (20) is in limiting contact with the loosening stop rod (19).

5. A biomass boiler stokehold feeder fire protection access door as defined in claim 4, wherein: two second cross bars (15) are fixedly connected in the frame (1), the two second cross bars (15) are respectively located on two sides of the door body (2), a space is reserved between the second cross bars (15) and the first cross bars (12), the space is correspondingly arranged with a furnace mouth of a biomass boiler, a space is reserved between the second cross bars (15) and the bottom wall of the frame (1), a plurality of ash discharging doors (14) are located between the second cross bars (15) and the bottom wall of the frame (1) and are distributed at equal intervals along the width direction of the frame (1), and the ash discharging doors (14) are connected with the frame (1) through bolts.

6. A biomass boiler stokehold feeder fire protection access door as claimed in claim 2, wherein: the door body (2) comprises a connecting plate (201), two connecting lugs (10) are fixedly connected to two ends of the top surface of the connecting plate (201) respectively, the connecting lugs (10) are arranged along the length direction of the connecting plate (201), and the connecting lugs (10) extend out of the connecting plate (201);

the biomass boiler is characterized in that two ends of the connecting plate (201) are fixedly connected with water outlet pipes (204) which are vertically arranged, the connecting plate (201) is located at the top ends of the water outlet pipes (204), the cooling mechanism is arranged between the two bottom ends of the water outlet pipes (204), a distance is reserved between the cooling mechanism and the connecting plate (201), and the distance is arranged corresponding to a furnace mouth of the biomass boiler.

7. The fire protection access door for a stokehold feeder of a biomass boiler as claimed in claim 6, wherein: the cooling mechanism comprises a second water conveying pipe (209) fixedly connected between two water outlet pipes (204), the second water conveying pipe (209) is horizontally arranged and communicated with the two water outlet pipes (204), two baffles (212) are fixedly connected in the second water conveying pipe (209), the two baffles (212) are used for respectively separating two water return cavities and one water inlet cavity in the second water conveying pipe (209), the water inlet cavities are positioned between the two water return cavities, a water inlet (210) is fixedly connected at the bottom end of the second water conveying pipe (209), the water inlet (210) is communicated with the water inlet cavities, a water inlet pipe (211) is communicated with the top end of the second water conveying pipe (209), a plurality of water inlet heat conducting pipes (207) and a plurality of water outlet heat conducting pipes (208) are fixedly connected with the water inlet cavities, a plurality of water outlet heat conducting pipes (208) are respectively communicated with the two water return cavities, a plurality of water inlet heat conducting pipes (207), a plurality of water outlet heat conducting pipes (208) are respectively communicated with the first water conveying pipe (206) and the first water conveying pipe (204) are respectively communicated with the water outlet pipes (204).

8. The fire protection access door for a stokehold feeder of a biomass boiler as recited in claim 7, wherein: a ribbed plate (205) is fixedly connected between the top surface of the first water delivery pipe (206) and the water outlet pipe (204).