CN214075770U - Flue gas denitration and desulfurization device - Google Patents

Abstract

The utility model discloses a flue gas denitration desulphurization unit, its technical scheme is: including the equipment body, the equipment body passes through bolt fixed mounting in the inside upper end of vibration damping mount, vibration damping mount lower extreme joint is at the inside both ends of vibration damping platform, vibration damping platform upside both ends welding elevating gear, elevating gear upper end welding curb plate, damping device is connected to the curb plate inboard, the inside bottom welding unable adjustment base of vibration damping platform, the first movable rod of pivot fixed mounting is passed through to the unable adjustment base upper end, first movable rod port passes through pivot fixed mounting inside connecting the axle bed, connect the axle bed inside through pivot fixed mounting second movable rod, second movable rod upper end is through pivot fixed mounting in the vibration damping mount bottom, the beneficial effects of the utility model are that: reach the effect that reduces the inside part of device and collide each other, increase flue gas denitration desulphurization unit's life.

Description

Flue gas denitration and desulfurization device

Technical Field

The utility model relates to a flue gas field, concretely relates to flue gas denitration desulphurization unit.

Background

The flue gas is a mixture of gas and smoke dust, and is a main reason for polluting atmosphere of residential areas, the components of the flue gas are complex, the gas comprises water vapor, sulfur dioxide, nitrogen, oxygen, carbon monoxide, carbon dioxide, hydrocarbons, nitrogen oxides and the like, and the smoke dust comprises ash content, coal particles, oil drops, high-temperature cracking products and the like of fuel;

therefore, the pollution of the smoke to the environment is the composite pollution of various poisons, the harmfulness of the smoke to the human body is related to the size of particles, most of the harmfulness to the human body is the flying dust with the diameter less than 10um, and particularly, the harmfulness is the largest with the flying dust of 1-2.5 um;

the desulfurization and denitration equipment is used for removing SO2 in flue gas in desulfurization, denitration is mainly used for removing NOX in flue gas, the two substances enter the atmosphere to form acid rain, and the acid rain has great harm to human beings, SO that the national advocates environmental protection, and the flue gas taking coal as fuel contains the substances.

The prior art has the following defects: the existing flue gas denitration and desulfurization device can vibrate when in operation, so that parts inside the device collide with each other, and the service life of the flue gas denitration and desulfurization device is shortened.

Therefore, it is necessary to invent a flue gas denitration and desulfurization device.

SUMMERY OF THE UTILITY MODEL

Therefore, the utility model provides a flue gas denitration desulphurization unit through equipment body fixed mounting in the vibration damping mount upper end, and vibration damping mount lower extreme joint is inside shock attenuation platform, and rethread equipment body both ends are equipped with damping device to the inside part of solution device collides each other, leads to the problem that flue gas denitration desulphurization unit's life reduces.

In order to achieve the above object, the present invention provides the following technical solutions: a flue gas denitration and desulfurization device comprises an equipment body, wherein the equipment body is fixedly installed at the upper end inside a shock absorption base through bolts, the lower end of the shock absorption base is clamped at two ends inside a shock absorption platform, lifting devices are welded at two ends of the upper side of the shock absorption platform, side plates are welded at the upper ends of the lifting devices, and the inner sides of the side plates are connected with the shock absorption devices;

a fixed base is welded at the bottom end inside the shock absorption platform, a first movable rod is fixedly mounted at the upper end of the fixed base through a shaft pin, a port of the first movable rod is fixedly mounted inside a connecting shaft seat through the shaft pin, a second movable rod is fixedly mounted inside the connecting shaft seat through the shaft pin, the upper end of the second movable rod is fixedly mounted at the bottom end of the shock absorption base through the shaft pin, a support rod is welded between the inner sides of the connecting shaft seats, and a spring is sleeved outside the connecting shaft seat;

the lifting device comprises an electric push rod, the bottom end of the electric push rod is welded to the two sides of the top end of the damping platform, and the upper end of the electric push rod is welded to the bottom end of the side plate.

Preferably, the two ends of the damping base are fixedly provided with limit bolts through nuts, the outer wall of each limit bolt is sleeved with a buffer spring, the damping base is connected with a buffer plate through the limit bolts, the two ends of the buffer plate are welded with sliding blocks, and the sliding blocks are connected to the two ends inside the damping platform in a clamping mode.

Preferably, first movable rod sets up to two sets ofly, the second movable rod sets up to two sets ofly, the bracing piece sets up to two sets ofly, first movable rod with the second movable rod is connected for the rhombus, pivot fixed mounting is passed through in the middle of the buffer board front end in second movable rod upper end, pivot fixed mounting is passed through in the middle of the buffer board front end in bracing piece upper end, the bracing piece lower extreme passes through pivot fixed mounting inside unable adjustment base.

Preferably, elevating gear still includes screw rod, motor and lifting telescopic link, screw rod threaded connection be in the inside both ends of shock attenuation platform, the screw rod upper end is connected the output of motor, motor lower extreme both sides welding lifting telescopic link, the welding of lifting telescopic link lower extreme is in the curb plate upper end.

Preferably, the damping device comprises a damping shaft rod, the damping shaft rod is fixedly installed on the inner side of the side plate through a shaft pin, a port of the damping shaft rod is fixedly installed inside a damping sliding block through the shaft pin, a damping spring is sleeved between the sliding blocks, the sliding blocks are clamped inside a fixed plate, and a rubber layer is bonded on the inner side of the fixed plate.

Preferably, the shock-absorbing shafts are arranged in two groups.

Compared with the prior art, this flue gas denitration desulphurization unit's advantage:

the utility model discloses a damping platform inside bottom welding unable adjustment base, unable adjustment base upper end is through pivot fixed mounting first movable rod, first movable rod port is through pivot fixed mounting inside connecting the axle bed, connecting the axle bed inside through pivot fixed mounting second movable rod, connect the welding bracing piece between the axle bed inboard, connect the axle bed outside and cup joint the spring, rethread second movable rod upper end is through pivot fixed mounting in damping base bottom, when the buffer board receives the power that the equipment body shakes, the buffer board moves down, drive the outside activity of second movable rod, the outside activity of second movable rod drive first movable rod, under the effect of bracing piece and spring, make the buffer board reconversion, play buffering and absorbing effect, reach the effect that plays the shock attenuation to the equipment body, thereby reach the effect that reduces the part mutual collision inside the device, increase the service life of the flue gas denitration and desulfurization device.

Drawings

Fig. 1 is a schematic view of the overall structure of embodiment 1 provided by the present invention;

FIG. 2 is an enlarged view of the area A of example 1 provided by the present invention;

fig. 3 is a schematic view of a slider structure according to embodiment 1 of the present invention;

fig. 4 is a schematic structural view of a fixing device according to embodiment 2 of the present invention.

In the figure: the device comprises a device body 1, a damping base 2, a limiting bolt 21, a buffer spring 211, a buffer plate 22, a sliding block 23, a damping platform 3, a fixed base 31, a first movable rod 32, a connecting shaft seat 33, a second movable rod 34, a supporting rod 35, a spring 36, a lifting device 4, an electric push rod 41, a screw rod 42, a motor 421, a lifting telescopic rod 422, a side plate 5, a damping device 6, a damping shaft rod 61, a damping sliding block 62, a damping spring 63, a fixed plate 64 and a rubber layer 65.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

Embodiment 1, referring to fig. 1 to 3, the utility model provides a flue gas denitration and desulfurization device, which comprises an apparatus body 1, a damping base 2, a damping platform 3, a lifting device 4, a side plate 5 and a damping device 6;

further, the upper end inside the shock absorption base 2 is fixedly provided with the equipment body 1 through a bolt, the shock absorption base 2 comprises a limiting bolt 21, a buffer spring 211, a buffer plate 22 and a sliding block 23, specifically, the limiting bolt 21 is fixedly arranged at the two ends of the shock absorption base 2 through a nut, the buffer spring 211 is sleeved on the outer wall of the limiting bolt 21, the shock absorption base 2 is connected with the buffer plate 22 through the limiting bolt 21, the sliding block 23 is welded at the two ends of the buffer plate 22, the sliding block 23 is clamped at the two ends inside the shock absorption platform 3, the equipment body 1 is fixedly arranged through the bolt at the upper end inside the shock absorption base 2, the limiting bolt 21 is fixedly arranged at the two ends of the shock absorption base 2 through a nut, the buffer spring 211 is sleeved on the outer wall of the limiting bolt 21, the shock absorption base 2 is connected with the buffer plate 22 through the limiting bolt 21, the buffering effect is achieved, the effect of reducing the vibration of the equipment body 1 is achieved, the sliding block 23 is welded at the two ends of the buffer plate 22, the sliding blocks 23 are clamped at two ends inside the damping platform 3 to play a limiting role, and the effect of preventing the equipment body 1 from falling off due to excessive deflection when the equipment body 1 vibrates downwards is achieved;

further, the upper end of the damping platform 3 is welded with the lifting device 4, the damping platform 3 comprises a fixed base 31, a first movable rod 32, a connecting shaft seat 33, a second movable rod 34, a support rod 35 and a spring 36, specifically, the bottom end of the inside of the damping platform 3 is welded with the fixed base 31, the upper end of the fixed base 31 is fixedly provided with the first movable rod 32 through a shaft pin, the port of the first movable rod 32 is fixedly arranged inside the connecting shaft seat 33 through the shaft pin, the inside of the connecting shaft seat 33 is fixedly provided with the second movable rod 34 through the shaft pin, the upper end of the second movable rod 34 is fixedly arranged at the bottom end of the damping base 2 through the shaft pin, the support rod 35 is welded between the inner sides of the connecting shaft seat 33, the outer side of the connecting shaft seat 33 is sleeved with the spring 36, because the bottom end of the inside of the damping platform 3 is welded with the fixed base 31, the upper end of the fixed base 31 is fixedly provided with the first movable rod 32 through the shaft pin, the port of the first movable rod 32 is fixedly arranged inside the connecting shaft pin 33, a second movable rod 34 is fixedly installed inside the connecting shaft seat 33 through a shaft pin, a support rod 35 is welded between the inner sides of the connecting shaft seat 33, a spring 36 is sleeved outside the connecting shaft seat 33, the upper end of the second movable rod 34 is fixedly installed at the bottom end of the damping base 2 through the shaft pin, when the buffer plate 22 is subjected to the vibration force of the equipment body 1, the buffer plate 22 moves downwards to drive the second movable rod 34 to move outwards, the second movable rod 34 drives the first movable rod 32 to move outwards, the buffer plate 22 is restored to the original state under the action of the support rod 35 and the spring 36, the buffering and damping effects are achieved, the damping effect on the equipment body 1 is achieved, the effect of reducing mutual collision of parts inside the device is achieved, and the service life of the flue gas denitration and desulfurization device is prolonged;

further, the lifting device 4 is welded on two sides of the upper end of the damping platform 3, the lifting device 4 comprises an electric push rod 41, specifically, the bottom end of the electric push rod 41 is welded on two sides of the top end of the damping platform 3, the model of the electric push rod 41 is DT100, the electric push rod 41 is also named as a linear actuator, and mainly comprises a motor push rod, a control device and other mechanisms, the bottom end of the electric push rod 41 is welded on two sides of the top end of the damping platform 3, and the upper end of the electric push rod 41 is welded on the bottom end of the side plate 5, so that the electric push rod 41 controls the side plate 5 to lift, the damping device 6 can perform auxiliary damping on flue gas denitration and desulfurization devices with different shapes, the lifting effect is achieved, and the damping device 6 can perform auxiliary damping on flue gas denitration and desulfurization devices with different shapes;

further, the damping device 6 is fixedly installed on the inner side of the side plate 5, the damping device 6 comprises a damping shaft rod 61, a damping sliding block 62, a damping spring 63, a fixing plate 64 and a rubber layer 65, concretely, the damping device 6 comprises a damping shaft rod 61, the damping shaft rod 61 is fixedly installed on the inner side of the side plate 5 through a shaft pin, a port of the damping shaft rod 61 is fixedly installed inside the damping sliding block 62 through a shaft pin, the damping spring 63 is sleeved between the sliding blocks 62, the sliding block 62 is clamped inside the fixing plate 64, the rubber layer 65 is adhered to the inner side of the fixing plate 64, the rubber layer 65 is made of acrylate rubber, the acrylate rubber is an elastomer obtained by copolymerizing acrylate as a main monomer, the main chain of the elastomer is a saturated carbon chain, the side group is a polar ester group, and the elastomer has the characteristics of heat resistance, aging resistance, oil resistance, ozone resistance, ultraviolet resistance and the like, because the damping device 6 comprises the damping shaft rod 61, the damping shaft rod 61 is fixedly installed on the inner side of the side plate 5 through a shaft pin, damping shaft 61 port passes through pivot fixed mounting inside damping sliding block 62, cup joint damping spring 63 between the slider 62, slider 62 joint is inside fixed plate 64, fixed plate 64 inboard bonding rubber layer 65, when equipment body 1 takes place vibrations, will promote rubber layer 65 and move to the outside, rubber layer 65 drives fixed plate 64 and moves to the outside, thereby make damping sliding block 62 drive damping shaft 61 and move to the lower extreme, under damping spring 63 and rubber layer 65's effect, make damping sliding block 62 drive damping shaft 61 reconversion, play absorbing effect, reach and cushion equipment body 1 both ends, increase equipment body 1's shock attenuation effect, and damping device 6 still has supplementary fixed effect to equipment body 1, it is excessive to prevent equipment body 1 vibrations, and lead to the effect that drops.

The utility model discloses a use as follows: the technical personnel in the field fixedly install the equipment body 1 through the bolt through the upper end inside the damping base 2, then fixedly install the limit bolt 21 through the nut through the two ends of the damping base 2, the outer wall of the limit bolt 21 is sleeved with the buffer spring 211, the damping base 2 is connected with the buffer plate 22 through the limit bolt 21 to play a role of buffering, and the effect of reducing the vibration of the equipment body 1 is achieved, the slide blocks 23 are welded through the two ends of the buffer plate 22, the slide blocks 23 are clamped at the two ends inside the damping platform 3 to play a role of limiting, so that the effect of preventing the equipment body 1 from excessively deviating when vibrating downwards to cause the equipment body 1 to fall off is achieved, because the bottom end inside the damping platform 3 is welded with the fixed base 31, the first movable rod 32 is fixedly installed at the upper end of the fixed base 31 through the shaft pin, the port of the first movable rod 32 is fixedly installed inside the connecting shaft seat 33 through the shaft pin, and the second movable rod 34 is fixedly installed inside the connecting shaft seat 33 through the shaft pin, a support rod 35 is welded between the inner sides of the connecting shaft seats 33, springs 36 are sleeved on the outer sides of the connecting shaft seats 33, the upper ends of the second movable rods 34 are fixedly installed at the bottom end of the damping base 2 through shaft pins, when the buffer plate 22 is subjected to the force of vibration of the equipment body 1, the buffer plate 22 moves downwards to drive the second movable rods 34 to move outwards, the second movable rods 34 drive the first movable rods 32 to move outwards, under the action of the support rod 35 and the springs 36, the buffer plate 22 is restored to the original state to play a role in buffering and damping, the effect of damping the equipment body 1 is achieved, the effect of reducing mutual collision of parts in the device is achieved, the service life of the flue gas denitration and desulfurization device is prolonged, the bottom ends of the electric push rods 41 are welded on the two sides of the top end of the damping platform 3, the upper ends of the electric push rods 41 are welded at the bottom ends of the side plates 5, and the electric push rods 41 control the side plates 5 to lift, the damping device 6 can perform auxiliary damping on flue gas denitration and desulfurization devices with different shapes, and has a lifting function, so that the damping device 6 can perform auxiliary damping on flue gas denitration and desulfurization devices with different shapes, because the damping device 6 comprises a damping shaft rod 61, the damping shaft rod 61 is fixedly arranged on the inner side of the side plate 5 through a shaft pin, the port of the damping shaft rod 61 is fixedly arranged in the damping slide block 62 through the shaft pin, a damping spring 63 is sleeved between the slide blocks 62, the slide block 62 is clamped in the fixing plate 64, the rubber layer 65 is adhered on the inner side of the fixing plate 64, when the equipment body 1 vibrates, the rubber layer 65 pushes the rubber layer 65 to move outwards, the rubber layer 65 drives the fixing plate 64 to move outwards, so that the damping slide block 62 drives the damping shaft rod 61 to move upwards and downwards, and under the action of the damping spring 63 and the rubber layer 65, the damping slide block 62 drives the damping shaft rod 61 to recover the original shape, play absorbing effect, reach and carry out the shock attenuation to 1 both ends of equipment body, increase equipment body 1's shock attenuation effect, and damping device 6 still has supplementary fixed effect to equipment body 1, prevents that equipment body 1 from shaking excessively, and leads to the effect that drops.

Embodiment 2, referring to fig. 4, the utility model provides a flue gas denitration and desulfurization device, which comprises a lifting device 4;

further, the lifting device 4 is in threaded connection with two ends inside the damping platform 3, the lifting device 4 comprises a screw rod 42, a motor 421 and a lifting telescopic rod 422, specifically, the screw rod 42 is in threaded connection with two ends inside the damping platform 3, the upper end of the screw rod 42 is connected with the output end of the motor 421, the lifting telescopic rods 422 are welded on two sides of the lower end of the motor 421, the lower end of the lifting telescopic rod 422 is welded on the upper end of the side plate 5, the motor 421 is a three-phase asynchronous motor, because the screw rod 42 is connected with the two ends of the interior of the damping platform 3 in a threaded manner, the upper end of the screw rod 42 is connected with the output end of the motor 421, the two sides of the lower end of the motor 421 are welded with the lifting telescopic rods 422, the lower end of the lifting telescopic rods 422 is welded on the upper end of the side plate 5, when the motor 421 is started, the motor 421 drives the screw rod 42 to rotate, thereby driving the lifting telescopic rod 422 to stretch and retract, and enabling the screw rod 42 to drive the side plate 5 to lift, so as to achieve the lifting effect, and achieve the effect that the damping device 6 can perform auxiliary damping on flue gas denitration and desulfurization devices with different shapes;

the utility model discloses a use as follows: the technical personnel in the field fixedly install the equipment body 1 through the bolt through the upper end inside the damping base 2, then fixedly install the limit bolt 21 through the nut through the two ends of the damping base 2, the outer wall of the limit bolt 21 is sleeved with the buffer spring 211, the damping base 2 is connected with the buffer plate 22 through the limit bolt 21 to play a role of buffering, and the effect of reducing the vibration of the equipment body 1 is achieved, the slide blocks 23 are welded through the two ends of the buffer plate 22, the slide blocks 23 are clamped at the two ends inside the damping platform 3 to play a role of limiting, so that the effect of preventing the equipment body 1 from excessively deviating when vibrating downwards to cause the equipment body 1 to fall off is achieved, because the bottom end inside the damping platform 3 is welded with the fixed base 31, the first movable rod 32 is fixedly installed at the upper end of the fixed base 31 through the shaft pin, the port of the first movable rod 32 is fixedly installed inside the, a support rod 35 is welded between the inner sides of the connecting shaft seats 33, a spring 36 is sleeved on the outer side of the connecting shaft seats 33, the upper end of a second movable rod 34 is fixedly arranged at the bottom end of the damping base 2 through a shaft pin, when the buffer plate 22 is subjected to the force of the vibration of the equipment body 1, the buffer plate 22 moves downwards to drive the second movable rod 34 to move outwards, the second movable rod 34 drives a first movable rod 32 to move outwards, under the action of the support rod 35 and the spring 36, the buffer plate 22 is restored to the original state to play a role in buffering and damping, so that the damping effect on the equipment body 1 is achieved, the effect of reducing the mutual collision of parts in the device is achieved, the service life of the flue gas denitration and desulfurization device is prolonged, as screw rods 42 are connected with the two ends in the damping platform 3 through threads, the upper end of the screw rod 42 is connected with the output end of a motor 421, lifting telescopic rods, when the motor 421 is started, the motor 421 drives the screw rod 42 to rotate, thereby driving the lifting telescopic rod 422 to extend and retract, so that the screw rod 42 drives the side plate 5 to lift, thereby achieving the effect of assisting in damping of flue gas denitration and desulfurization devices with different shapes, because the damping device 6 comprises a damping shaft rod 61, the damping shaft rod 61 is fixedly arranged at the inner side of the side plate 5 through a shaft pin, the port of the damping shaft rod 61 is fixedly arranged at the inner side of a damping slide block 62 through the shaft pin, a damping spring 63 is sleeved between the slide blocks 62, the slide block 62 is clamped inside a fixing plate 64, a rubber layer 65 is adhered at the inner side of the fixing plate 64, when the equipment body 1 vibrates, the rubber layer 65 is pushed to move towards the outer side, the rubber layer 65 drives the fixing plate 64 to move towards the outer side, thereby the damping slide block 62 drives the damping shaft rod 61 to move towards the upper end and the lower end, under the action of the damping spring 63 and the rubber layer 65, make damping slider 62 drive shock attenuation axostylus axostyle 61 reconversion, play absorbing effect, reach and carry out the shock attenuation to equipment body 1 both ends, increase equipment body 1's shock attenuation effect, and damping device 6 still has supplementary fixed effect to equipment body 1, prevent that equipment body 1 from shaking excessively, and lead to the effect that drops.

The above description is only a preferred embodiment of the present invention, and any person skilled in the art may modify the present invention or modify it into an equivalent technical solution by using the technical solutions described above. Therefore, any simple modifications or equivalent replacements made according to the technical solution of the present invention belong to the scope of the claimed invention as far as possible.

Claims (6)

1. The utility model provides a flue gas denitration desulphurization unit, includes equipment body (1), its characterized in that: the equipment body (1) is fixedly installed at the upper end inside the shock absorption base (2) through bolts, the lower end of the shock absorption base (2) is clamped at two ends inside the shock absorption platform (3), the lifting device (4) is welded at two ends of the upper side of the shock absorption platform (3), the side plate (5) is welded at the upper end of the lifting device (4), and the shock absorption device (6) is connected to the inner side of the side plate (5);

a fixed base (31) is welded at the bottom end inside the damping platform (3), a first movable rod (32) is fixedly mounted at the upper end of the fixed base (31) through a shaft pin, a port of the first movable rod (32) is fixedly mounted inside a connecting shaft seat (33) through the shaft pin, a second movable rod (34) is fixedly mounted inside the connecting shaft seat (33) through the shaft pin, the upper end of the second movable rod (34) is fixedly mounted at the bottom end of the damping base (2) through the shaft pin, a support rod (35) is welded between the inner sides of the connecting shaft seat (33), and a spring (36) is sleeved on the outer side of the connecting shaft seat (33);

the lifting device (4) comprises an electric push rod (41), the bottom end of the electric push rod (41) is welded to the two sides of the top end of the damping platform (3), and the upper end of the electric push rod (41) is welded to the bottom end of the side plate (5).

2. The flue gas denitration and desulfurization device of claim 1, characterized in that: damping mount (2) both ends are passed through nut fixed mounting limit bolt (21), limit bolt (21) outer wall cup joints buffer spring (211), damping mount (2) are through limit bolt (21) connection buffer board (22), buffer board (22) both ends welding slider (23), slider (23) joint is in damping platform (3) inside both ends.

3. The flue gas denitration and desulfurization device of claim 1, characterized in that: first movable rod (32) set up to two sets of, second movable rod (34) set up to two sets of, bracing piece (35) set up to two sets of, first movable rod (32) with second movable rod (34) are connected for the rhombus, second movable rod (34) upper end is in the middle of buffer board (22) front end through pivot fixed mounting, bracing piece (35) lower extreme passes through pivot fixed mounting and is in unable adjustment base (31) are inside.

4. The flue gas denitration and desulfurization device of claim 1, characterized in that: elevating gear (4) still include screw rod (42), motor (421) and lifting telescopic link (422), screw rod (42) threaded connection be in the inside both ends of shock attenuation platform (3), screw rod (42) upper end is connected the output of motor (421), motor (421) lower extreme both sides welding lifting telescopic link (422), welding lifting telescopic link (422) lower extreme is in curb plate (5) upper end.

5. The flue gas denitration and desulfurization device of claim 1, characterized in that: the damping device (6) comprises a damping shaft rod (61), the damping shaft rod (61) is fixedly installed on the inner side of the side plate (5) through a shaft pin, a port of the damping shaft rod (61) is fixedly installed inside a damping sliding block (62) through the shaft pin, a damping spring (63) is sleeved between the damping sliding blocks (62), the damping sliding block (62) is connected inside a fixing plate (64) in a clamping mode, and a rubber layer (65) is bonded on the inner side of the fixing plate (64).

6. The flue gas denitration and desulfurization device of claim 5, characterized in that: the damping shafts (61) are arranged in two groups.

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