CN112209594B

CN112209594B - Automatic ash removal device of belt type sludge dryer and control method thereof

Info

Publication number: CN112209594B
Application number: CN202010904776.1A
Authority: CN
Inventors: 史亮; 潘毅锋
Original assignee: Guangdong Shenling Environmental Systems Co Ltd
Current assignee: Guangdong Shenling Environmental Systems Co Ltd
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2022-03-25
Anticipated expiration: 2040-09-01
Also published as: CN112209594A

Abstract

The utility model provides a belt sludge dryer automatic ash removal device and control method thereof, the desiccator includes box, guipure sludge conveyer and control system, the box lateral wall is provided with the return air inlet, the desiccator still includes automatic ash removal device, automatic ash removal device include that filter mechanism, collection mechanism, machinery tremble glassware and inductor, collection mechanism is located filter mechanism below, and be located guipure sludge conveyer top, machinery trembles the glassware and is used for driving the filter mechanism vibration, the inductor is used for starting or stopping machinery trembles the glassware. The invention monitors the change of the filtering mechanism through the sensor, and the control system controls the starting or stopping of the mechanical vibrator, so that the dust in the filtering mechanism is collected by the collecting mechanism. The invention greatly reduces the maintenance times of the dust filtering device in the drying box, reduces the operation and maintenance cost, and simultaneously can inhibit the dust concentration in the drying box at a lower level for a long time.

Description

Automatic ash removal device of belt type sludge dryer and control method thereof

Technical Field

The invention relates to the field of sludge treatment in environment-friendly products, in particular to an automatic ash removal device of a belt type sludge dryer and a control method thereof.

Background

At present, most of belt type sludge dryers adopting hot air drying are in direct contact with the sludge through hot air in a drying box. When the water is lost to a certain degree, the sludge changes in shape, cracks on the surface, shrinks, and breaks the strip-shaped materials into particles. And the friction in the conveying process is added, so that partial dry mud particles are further crushed into powder slag or powder. With the circulation of the hot air, fine dust particles or powder are carried and dispersed into the whole drying box and even overflow out of the drying box. When dust concentration exceeds a limit, the risk of explosion exists, and dust enters the heat exchanger and can adhere to parts such as fins, so that the contact heat exchange of gas is influenced, and the heat exchange efficiency is weakened. Dust enters the condensed water collecting device, slurry is generated, local blockage is generated, and the discharge of condensed water is influenced.

The belt sludge dryers of many manufacturers use primary or intermediate filters in the circulating air ducts to prevent dust from entering the heat exchangers. Most of the primary filters are bag filters and can block most of dust particles. However, the amount of dust generated by drying sludge is usually very large, the bag filter can be saturated in adsorption after working for a short time, the flying dust scattered in the drying box can not be effectively absorbed and collected, and the dust concentration can be recovered to a higher level. When the bag filter is in an adsorption saturation state (or failure state), a large local resistance is caused to a circulation loop, the ventilation air pressure of the heat exchanger is insufficient, and the heat exchange performance and the stability of a system are affected. Such bag filters are made of fiber or paper, are generally thin in texture, and cannot be cleaned of accumulated dust by water flushing after failure. In this regard, these manufacturers have provided a solution to shut down the filter to remove the failed filter and replace it with a new filter. In the case of working conditions under high dust concentration operation, the operation is sometimes changed several times a month. Bag filters become a consumable, and are expensive in the long term, in terms of operating costs.

The automatic ash removal device of the prior belt type sludge dryer is as CN207407664U, the belt type sludge dryer comprises a box body and a mesh belt positioned in the box body, the bottom of the box body is provided with a box bottom plate, the mesh belt is positioned on the box bottom plate, the mesh belt comprises an upper layer and a lower layer, the automatic ash removal device of the belt type sludge dryer comprises a plurality of scrapers, a bottom ash removal channel, a recovery port and a cleaning port, the scrapers are fixed on the upper layer and the lower layer, the bottom ash removal channel is positioned below the box bottom plate, the recovery port and the cleaning port are respectively arranged on the right wall and the left wall of the box body and are communicated with the bottom ash removal channel. This automatic ash removal device can automatic clearance ash-and-slag on the box bottom plate, nevertheless can't handle tiny dirt particle or powder in the drying cabinet, so still can't solve the too high dust concentration in the drying cabinet, the explosion hidden danger or the jam scheduling problem that cause.

Disclosure of Invention

The invention aims to overcome at least one defect of the prior art, and provides an automatic dust cleaning device of a belt type sludge dryer and a control method thereof, which are used for solving the problem that the dust control measure of the prior belt type sludge dryer needs to frequently replace a filter bag, and achieving the effects of reducing maintenance and operation cost.

The invention adopts the technical scheme that the automatic dust cleaning device of the belt type sludge dryer comprises a box body, a mesh belt sludge conveyor and a control system, wherein the sludge conveyor is arranged inside the box body, the mesh belt sludge conveyor is electrically connected with the control system, and the side wall of the box body is provided with an air return opening; the drying machine further comprises an automatic ash removal device, the automatic ash removal device is electrically connected with the control system, the automatic ash removal device is positioned above the mesh belt sludge conveyor and outside the air return port, and the box body is divided into a negative pressure cavity and a positive pressure cavity; the automatic ash removal device comprises a filtering mechanism, a collecting mechanism, a mechanical material shaking device and an inductor, wherein the collecting mechanism is located below the filtering mechanism and above the mesh belt sludge conveyor, the mechanical material shaking device is used for driving the filtering mechanism to vibrate, and the inductor is used for starting or stopping the mechanical material shaking device.

The mesh belt sludge conveyor dries the sludge conveyed into the box body, fine dust particles or powder can be lifted and dispersed into the whole drying box along with the drying, the automatic ash removing device is positioned above the mesh belt sludge conveyor and outside the air return inlet, and divides the box body into a negative pressure cavity and a positive pressure cavity, therefore, the pressure difference between the positive pressure cavity and the negative pressure cavity forces the dust-containing air to flow from the outside of the automatic dust removing device to the automatic dust removing device, the dust-containing air passes through the filtering mechanism, the dust remains in the filtering mechanism, when the sensor senses that the dust in the filtering mechanism is too much to influence the filtering effect, the mechanical material shaking device is started to drive the filtering mechanism to vibrate, so that the dust collected by the filtering mechanism falls off to be collected by the collecting mechanism, and then the dust is discharged out of the drying box by the collecting mechanism, thereby achieving the effect of controlling dust in the drying machine. This technical scheme is just full-automatic going on after the drying cabinet starts, realizes automated control through the detection of inductor to filtering mechanism, and maintenance and operation need not artificial intervention, and the operation is high-efficient.

Furthermore, the filtering mechanism comprises a plurality of filter bags and a filter bag fixing component; the filter bag is inclined upwards, the filter bag is provided with a bag opening and a bag bottom, and the bag bottom is connected with the mechanical material shaking device; the filter bag fixing assembly supports the bag opening, the inductor is mounted on the filter bag fixing assembly, and the filter bag fixing assembly is mounted on a vertex angle in the box body to divide the vertex angle area into the negative pressure cavity; the filter bag inclination direction is the bag bottom towards the top angle direction. The filter bag is obliquely arranged, so that dust is collected and gathered in the filter bag, filtered air can still pass through the filter bag and enter the air return opening, and meanwhile, the falling of the dust is facilitated when the filter bag is vibrated by the mechanical material shaking device.

Furthermore, the filter bags are conical and are transversely arranged, and the total transverse width of the filter bags and the gaps among the filter bags is smaller than the width of the collecting mechanism. The filter bag is the toper, and the sack area is big, and more dust is accomodate to more dusty air of accessible, and a plurality of filter bag transverse arrangement can make the filter effect better, and the horizontal total width of filter bag is less than collect the mechanism width, can make the dust in the filter bag can be collected by collecting the mechanism completely. In order to optimize the collecting effect, prevent the collected dust from falling off in advance in the collecting process and remove the dust in the filter bag as far as possible during shaking, the inclination angle of the conical filter bag is set to be 30-60 degrees relative to the horizontal plane.

Furthermore, the filter bag fixing assembly comprises a vertical choke plate, a choke hole plate and a filter bag supporting plate, the vertical choke plate is connected to the upper inner wall of the box body, the choke hole plate obliquely supports the plane of the bag opening, the filter bag supporting plate is connected to the side wall of the box body, and the choke hole plate is connected with the vertical choke plate and the filter bag supporting plate; the vertical choke plate comprises an upper transition plate, the filter bag supporting plate comprises a lower transition plate, and the choke orifice plate is supported between the upper transition plate and the lower transition plate; the filter bag supporting plate and the side wall of the box body further comprise a metal plate structure, the metal plate structure is hinged to the filter bag supporting plate, a connecting rod is further arranged between the metal plate structure and the filter bag supporting plate, one end of the connecting rod is connected with the filter bag supporting plate, and the other end of the connecting rod is connected with the metal plate structure or the side wall of the box body.

The vertical choke plate, the choke hole plate, the filter bag supporting plate and the metal plate structure can prevent dust-containing air from bypassing the filter bag and entering the air return opening, and meanwhile, the air flow structure in the drying box is improved, so that the dust-containing air is promoted to flow into the filter bag from the bag opening of the filter bag and is filtered. Meanwhile, the wind-blocking pore plate is arranged on the plane of the bag opening, so that the shape of the bag opening can be supported and maintained, and the bag opening is not ventilated. The filter bag layer board is favorable to keeping the filter bag to be the slope gesture, and can provide certain bearing for the filter bag body. The sheet metal structure is connected with the filter bag supporting plate and the side wall of the box body, and is beneficial to fixing and adjusting the posture of the filter bag supporting plate.

Furthermore, the inductor is a tensile stress strain gauge, and the strain gauge is arranged at the joint of the choke orifice plate and the upper transition plate and the joint of the choke orifice plate and the lower transition plate. The strain gauge can measure the tensile stress borne by the vertical choke plate and the filter bag supporting plate in the whole ash cleaning process. In order to improve the sensitivity of the strain gauge, the wind blocking pore plate is lapped on the inner sides of the upper transition plate and the lower transition plate, the strain gauge is arranged at the joint, and in addition, the filter bag supporting plate is hinged with the metal plate structure and supported by a connecting rod to form a multi-connecting-rod structure. Above-mentioned structure will have certain structural deformation under the effect of inside and outside wind pressure differential, and the foil gage can be fast and accurate detect the change of the relative position between this kind of structure.

Further, the collecting mechanism comprises a material guide plate and a dust collecting groove, and the dust collecting groove is arranged below the material guide plate; the guide plate comprises a fixed plate and a movable plate, and the fixed plate is movably connected with the movable plate. The guide plate is used for guiding dust falling from the filter bag to fall into the dust collecting tank to be collected. The fixed plate is movably connected with the movable plate, so that the movable plate can move.

Furthermore, the dust collecting groove comprises a dust collecting groove pipe and a rotary groove cover, the rotary groove cover is arranged on the dust collecting groove pipe, and the dust collecting groove pipe is connected with the fixed plate; the rotary slot cover is connected with the movable plate through a linkage mechanism, and the linkage mechanism enables the rotary slot cover and the movable plate to have two movable states: the first state is that the rotary slot cover is opened, the outer edge of the movable plate at least exceeds the upper edge of the bag opening in the vertical direction, the second state is that the rotary slot cover is closed, and the outer edge of the movable plate does not exceed the lower edge of the bag opening in the vertical direction; the lower end of the dust collecting groove pipe is also connected with a dust collecting pipe, and the dust collecting pipe is also provided with an electromagnetic valve.

The dust collecting tank pipe is connected with the fixing plate, so that the dust collecting tank pipe can collect dust falling onto the fixing plate. The linkage mechanism enables the rotary slot cover and the movable plate to have two movable states: the first state is that the rotary slot cover is opened, and the outer edge of the movable plate at least exceeds the upper edge of the bag opening in the vertical direction, so that the plate surface of the movable plate can envelop most of the vertical projection surface of the bag opening of the filter bag, namely the dust at the bag opening can be completely contained; the second state is that the rotary slot cover is closed, and the outer edge of the movable plate does not exceed the lower edge of the bag opening in the vertical direction, so that a certain dust separation effect is achieved, dust is prevented from adhering to mechanical parts to influence the work of each part, and in addition, the air flow to the bag opening of the filter bag is not influenced, and the filtering efficiency is ensured. The lower end of the dust collecting groove pipe is also connected with a dust collecting pipe, so that dust collected in the dust collecting groove pipe can be further treated. And the dust absorption pipe is also provided with an electromagnetic valve, the electromagnetic valve is opened when dust absorption is needed for next treatment and is closed when dust absorption is not needed, so that the air flow in the box body is prevented from leaking when the mesh belt sludge dryer is in normal operation.

In order to solve the problems in the prior art, the invention adopts another technical scheme that the control method is suitable for the automatic ash removal device of the belt type sludge dryer, and the control method comprises the following steps under the control of the control system:

s1, drying the sludge conveyed into the box body by the mesh belt sludge conveyor;

s2, enabling dust-containing air flowing from the positive pressure cavity to the negative pressure cavity to pass through the automatic ash removal device, and continuously monitoring the change of the filtering mechanism by the sensor in the process;

s3, when the change of the filtering mechanism reaches a set upper threshold value, starting the mechanical material shaking device and the collecting mechanism, and enabling the dust collected in the filtering mechanism to fall to the collecting mechanism;

s4, stopping the mechanical material shaking device and the collecting mechanism when the change of the filtering mechanism reaches a set lower threshold value;

steps S3, S4 continue to loop after said step S2.

Further, the change of the filter mechanism in the step S2 is a change of tensile stress, the upper threshold in the step S3 is a tensile stress increase of 20% to 50% relative to the initial value, and the lower threshold in the step S4 is a tensile stress increase of 2% to 5% relative to the initial value.

The tensile stress of the filtering mechanism is increased by 20-50% relative to the initial value, namely the tensile stress reaches 120-150% of the initial value, the dust absorption amount is judged to be saturated when the dust absorbed and stored in the filtering mechanism is increased to a certain degree, so that the mechanical material shaking device can be started to start to clean the dust, and when the tensile stress of the filtering mechanism reaches the lower threshold value and is increased by 2-5% relative to the initial value, the tensile stress of the filtering mechanism is reduced from 120-150% of the initial value to 102-105% of the initial value, the dust in the filtering mechanism is reduced, and the dust cleaning is judged to be stopped.

Further, the collection mechanism comprises two states of deployment and storage: when the change of the filter mechanism reaches a set upper threshold in the step S3, the collection mechanism changes from the storage state to the deployed state; when the change of the filter mechanism reaches the set lower threshold in step S4, the collection mechanism changes from the deployed state to the stored state. When the change of the filtering mechanism reaches an upper threshold value, the filtering mechanism is used for representing that the dust adsorbed and stored by the filtering mechanism is saturated, and the ash removal is required to be started, so that the collecting mechanism needs to be changed into an unfolding state so as to collect the dust falling from the filtering mechanism; and when the change of the filtering mechanism reaches the lower threshold value, the dust passes through the dust removal on behalf of the filtering mechanism, the dust of the filtering mechanism is reduced, and the dust removal can be stopped, so that the collecting mechanism can be changed into a storage state to isolate the dust.

Compared with the prior art, the invention has the beneficial effects that: the automatic ash cleaning device is positioned in the space above the mesh belt sludge conveyor in the box body, and the prior belt sludge dryer does not need to be changed greatly. The filter bag as the main working part judges whether the automatic ash cleaning device needs to be opened or not according to the tensile stress change measured by the strain gauge on the fixing part of the pore plate of the bag opening. When the dust is needed to be cleaned, the control system automatically starts the mechanical material shaker and expands the collecting mechanism according to the set logic. The dust particles on the inner wall of the filter bag which is saturated in adsorption are shaken off to the material guide plate, then slide into the dust collection groove and are sucked out of the dryer. All action parts in the whole ash cleaning process are automatically linked and linked, the arrangement is clear, manual operation is not needed, and the automation level of the whole sludge drying system is improved. Because the dust can be automatically removed to the outside of the drying machine, the filter bag contained in the drying machine can not lose efficacy for a long time, and the dust concentration in the drying box can be inhibited to a lower level for a long time. Compared with the existing belt type sludge dryer, the belt type sludge dryer has the advantages that the maintenance times of the dust filter device are greatly reduced, the workload for cleaning the interior of the drying box is greatly reduced, a user does not need to add a lot of material cost for frequently replacing the filter bag, and accordingly, the operation and maintenance cost is reduced to a certain extent. The invention controls the dust amount in the sludge dryer, the circulating air pressure is kept stable, the long-time reliable operation of the dryer is ensured, the heat exchanger is not easy to be invaded by dust, and the attenuation of the heat exchange efficiency is slowed, so the automatic ash cleaning function brought by the invention can obtain long-term energy-saving benefit.

Drawings

FIG. 1 is a schematic view of the assembly structure of the present invention.

FIG. 2 is a schematic view of the filter mechanism of the present invention.

FIG. 3 is a schematic diagram of the position of a strain gage of the present invention.

FIG. 4 is a schematic view of the collecting mechanism of the present invention.

FIG. 5 is a schematic diagram of the linkage movement of the rotary slot cover-movable plate according to the present invention (from the second state to the first state).

FIG. 6 is a reference layout view of post-purification treatment of dust-laden air in example 1 of the present invention.

Fig. 7 is a flowchart of a control method in embodiment 1 of the present invention.

Fig. 8 is a flowchart of a control method in embodiment 2 of the present invention.

Wherein 1 represents a drying box body, 2 represents a mesh belt sludge conveyor, 3 represents an air return inlet, 4 represents a filter bag, 5 represents a vertical choke plate, 501 represents an upper transition plate, 6 represents a choke orifice plate, 7 represents a filter bag supporting plate, 701 represents a lower transition plate, 702 represents a sheet metal structure, 7021 represents a connecting rod of the sheet metal structure, 8 represents a fixed plate, 9 represents a movable plate, 10 represents a dust collection tank pipe, 11 represents a rotary tank cover, 12 represents a strain gauge, 13 represents a linkage mechanism, 14 represents a dust collection pipe, 15 represents a mechanical material shaking device, and 16 represents an electromagnetic valve.

Detailed Description

The drawings are only for purposes of illustration and are not to be construed as limiting the invention. For a better understanding of the following embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Example 1

As shown in fig. 1, the embodiment provides an automatic ash removal device for a belt sludge dryer, the dryer includes a box body 1, a belt sludge conveyor 2 and a control system (not shown in the figure), the belt sludge conveyor 2 is installed inside the box body 1, the sludge dryer is electrically connected with the control system, and a return air inlet 3 is arranged on a side wall of the box body 1; the dryer also comprises an automatic ash removal device, the automatic ash removal device is electrically connected with the control system, the automatic ash removal device is positioned above the mesh belt sludge conveyor 2 and outside the air return port 3, and the box body 1 is divided into a negative pressure cavity and a positive pressure cavity; automatic ash removal device include filtering mechanism, collect mechanism, machinery tremble glassware 15 and inductor, it is located to collect the mechanism filtering mechanism below, and is located 2 tops of guipure sludge conveyer, machinery trembles glassware 15 and is used for driving the filtering mechanism vibration, the inductor is used for starting or stops machinery trembles glassware 15.

The filtering mechanism comprises a plurality of filter bags 4 and a filter bag fixing component; the filter bag 4 is inclined upwards, the filter bag 4 is provided with a bag opening and a bag bottom, and the bag bottom is connected with the mechanical material shaking device 15; the filter bag fixing assembly supports the bag opening, the inductor is mounted on the filter bag fixing assembly, and the filter bag fixing assembly is mounted on a vertex angle in the box body 1 to divide the vertex angle area into the negative pressure cavity; the filter bag 4 is inclined in the direction that the bag bottom faces the top angle. The filter bags 4 are conical and are transversely arranged, and the total transverse width of the filter bags 4 and the gaps between the filter bags 4 is smaller than the width of the collecting mechanism.

As a preferable mode, in this embodiment, as shown in fig. 2, the filtering mechanism includes 4 filter bags arranged side by side and horizontally, an inclination angle of the filter bag 4 is specifically a 45 ° included angle with the horizontal plane direction, and a steel wire loop or a skeleton structure for maintaining a shape of the filter bag can be arranged in the mouth of the filter bag 4 and the bag, so as to maintain a better shape of the filter bag for storing dust. The filter bag 4 can also adopt a primary filter with the thickness more than or equal to 2mm and certain elasticity, so that most dust particles can be gathered in the bag by electrostatic attraction of the inner wall of the filter bag 4 and blocking of the bag cloth fibers, air can still pass through micropores on the bag cloth and enter the air return opening 3, and meanwhile, when the mechanical material shaking device 15 vibrates, the dust particles on the inner wall are easy to desorb. Meanwhile, a middle-effect net filter can be additionally arranged at the downstream of the air return opening 3 to further filter fine dust and purify return air, so that the surfaces of other parts are not polluted by dust.

Meanwhile, in a preferred embodiment, the mechanism of the motion generated by the mechanical shaker 15 may be a crank-link mechanism, a cam (eccentric wheel) mechanism, a gear/rack mechanism, or an alternating electromagnetic vibration. The action frequency of the mechanical material shaking device 15 can be adjusted by changing the rotating speed of a speed reduction driving motor of the mechanical material shaking device or changed along with the change of the electrifying frequency of the alternating electromagnetic vibrator. The lowest frequency is more than 4 times/second, the amplitude of the vibration wave can be set to be protected and limited, and the filter bag is prevented from being damaged due to the sharp amplitude. As shown in fig. 2, in this embodiment, a spring oscillator may be further connected between the mechanical material shaker 15 and the bag bottom of the filter bag 4, one end of the spring oscillator is connected to the bag bottom of the filter bag 4, the other end of the spring oscillator is connected to the mechanical material shaker 15, the mechanical material shaker 15 transmits motion to the spring oscillator when being opened, the spring oscillator recompresses and recovers deformation to cause violent vibration, so that amplitude transmitted to the filter bag 4 is increased, the filter bag, 4 bag bodies shake and vibrate, and much dust adsorbed on the inner wall can be separated from the bag body and fall down due to gravity. In addition, when the spring vibrator is static, the filter bag 4 is in a stretching state under the action of gravity, so that the filter bag 4 is driven to be in a natural tightening state when the spring vibrator is static.

As shown in fig. 3, the filter bag fixing assembly comprises a vertical choke plate 5, a choke orifice plate 6 and a filter bag support plate 7, wherein the vertical choke plate 5 is connected to the upper inner wall of the box body 1, the choke orifice plate 6 obliquely supports the plane of the bag opening, the filter bag support plate 7 is connected to the side wall of the box body 1, and the choke orifice plate 6 is connected with the vertical choke plate 5 and the filter bag support plate 7; the vertical choke plate 5 comprises an upper transition plate 501, the filter bag supporting plate 7 comprises a lower transition plate 701, and the choke orifice plate 6 is supported between the upper transition plate 501 and the lower transition plate 701; the filter bag supporting plate 7 with still include sheet metal construction 702 between the box 1 lateral wall, sheet metal construction 702 with filter bag supporting plate 7 is articulated to be connected, sheet metal construction 702 with still be provided with connecting rod 7021 between the filter bag supporting plate 7, connecting rod 7021 one end is connected filter bag supporting plate 7, and the other end is connected sheet metal construction 702 or the box 1 lateral wall. The filter bag supporting plate 7 can keep a slightly downward posture by adjusting the sheet metal structure 702, and when the position is properly adjusted, the structure can be stabilized by locking with nuts. The sheet metal structure 702 also prevents dust-containing air from flowing around from below the filter bag 4 into the return air inlet 3 during the ash removal operation of the device.

The inductor is a tensile stress strain gauge 12, and the strain gauge 12 is installed at the joint of the choke orifice 6 and the upper transition plate 501 and at the joint of the choke orifice 6 and the lower transition plate 701. The strain gauge 12 can detect the tensile stress of the filter bag 4 inflated by wind to the fixing part of the filter bag when circulating air circulates. When the dust particles absorbed and stored in the filter bag are increased, the total mass of the filter bag 4 is increased, and under the condition of certain circulating air volume, the tensile stress borne by the fixing parts (the vertical choke plate 5 and the filter bag supporting plate 7) below the filter bag 4 is increased. The change of the tensile stress measured by the strain gauge 12 can be used for judging the amount of dust adsorbed in the filter bag 4 under a certain wind pressure.

As shown in fig. 3, in this embodiment, as a preferable mode, the strain gauges 12 are divided into two groups, an upper group is fixedly attached to a joint between the choke orifice 6 and the upper transition plate 501, a lower group is fixedly attached to a joint between the choke orifice 6 and the lower transition plate 701, two groups of strain gauges adjacent to each other in the transverse direction are separated by a span of 2 to 3 pockets, and two groups of strain gauges adjacent to each other in the vertical direction are aligned.

As shown in fig. 4, the collecting mechanism includes a material guiding plate and a dust collecting chute, and the dust collecting chute is installed below the material guiding plate; the material guide plate comprises a fixed plate 8 and a movable plate 9, and the fixed plate 8 is movably connected with the movable plate 9. The movable connection between the fixed plate 8 and the movable plate 9 may be a hinged connection or a sliding connection, in this embodiment, it is preferable that the fixed plate 8 and the movable plate 9 are hinged, and the surface of the movable plate 9 can rotate around a hinged shaft. In this embodiment, a vibration blanking device may be further installed below the fixed plate 8, and since the fixed plate 8 is hinged to the movable plate 9, the vibration is transmitted to the movable plate 9, so that the dust particles on the plate surface are in a shivering state, and the dust particles are driven to move downward.

As shown in fig. 4 and 5, the dust collecting groove comprises a dust collecting groove tube 10 and a rotary groove cover 11, the rotary groove cover 11 is mounted on the dust collecting groove tube 10, and the dust collecting groove tube 10 is connected with the fixing plate 8; the rotary slot cover 11 is connected with the movable plate 9 through a linkage mechanism 13, and the linkage mechanism 13 enables the rotary slot cover 11 and the movable plate 9 to have two movable states: the first state is that rotatory capping 11 opens, and vertical direction is last the outer edge of fly leaf 9 surpasss at least the sack is gone up along, and the second state is that rotatory capping 11 closes, vertical direction is last the outer edge of fly leaf 9 does not exceed the sack is along down.

In a preferred embodiment, the centers of the two end surfaces of the dust collecting slot tube 10 may be provided with outward extending rotation shafts, which penetrate the center of the end surface of the rotary slot cover 11, so that the rotary slot cover 11 can rotate around the shaft. In addition, the radius of the arc of the cross section of the rotary slot cover 11 is slightly larger than the radius of the dust collecting slot pipe 10, so that the arc surface of the rotary slot cover just can cover the opening of the dust collecting slot pipe 10. The end face of the dust collecting groove pipe 10 can be not completely sealed, but is sealed by a filter material, two end faces of the rotary groove cover 11 can be hollow spoke-shaped, the outer edge of the rotary groove cover 11 is provided with a half-circle of standard straight teeth, a small speed reducing motor can be arranged on an accessory of the rotary groove cover 11, a gear of an output shaft of the small speed reducing motor is meshed with a gear on the outer edge of the end face of the rotary groove cover 11, the small speed reducing motor is controlled to rotate, and the rotary groove cover 11 can be driven to be opened and closed through gear transmission. The rotating slot cover 11 is connected with the movable plate 9 through a linkage mechanism 13, and can drive the movable plate 9 to move synchronously. The linkage mechanism 13 may be a simple counter-rotating swing link mechanism, as shown in fig. 5, the starting end of the driving rod of the mechanism is connected with the rotating point at the specific position of the lower half circle of the outer edge of the end cover of the rotary slot cover, and the other end of the driving rod is connected with one rod of the counter-rotating swing link. The other rod of the contra-rotating swing rod drives the rotating handle under the movable plate 9 through a straight connecting rod. The main transmission part of the contra-rotating swing rod mechanism can be arranged in a box, the rotating directions of the two extending swing rods are always opposite, and the mechanism for realizing contra-rotating can be a meshing gear set, can also be a belt pulley and a chain wheel which are driven in a shape like a Chinese character '8', and can also be other simple mechanical mechanisms. In addition, because the dust collecting slot pipe 10 is longer, in order to ensure the consistency of the rotation of the rotary slot cover 11 around the shaft, the two ends of the slot cover can be provided with small speed reducing motors, the power output of the two small speed reducing motors can be connected on a long shaft, and the center of the shaft can also be provided with an auxiliary meshing gear set which plays a supporting role, so that the synchronism and the stability of the rotation of the rotary slot cover 11 are further ensured. The linkage mechanism 13 between the movable plate 9 and the rotary slot cover 11 is also provided with two ends and has mirror symmetry structure. Meanwhile, in order to enable the movable plate 9 to be capable of pressing the lower edge of the bag opening in an upturned state, a spring can be arranged between the hinged positions of the movable plate 9 and the fixed plate 8.

As shown in fig. 4, a dust suction pipe 14 is connected to the lower end of the dust collection tank pipe 10, and an electromagnetic valve 16 is further disposed on the dust suction pipe 14.

As a preferable mode, as shown in fig. 6, in this embodiment, a dust sucking and processing and purifying device may be further connected behind the dust suction pipe 14, and the dust sucking and processing and purifying device may include a suction hose, a negative pressure draught fan, a cyclone spray dust collector, an electrostatic dust collector, an exhaust fan, and the like, and may be configured to take the dust in the dust carrying airflow out of the dryer to be separated, collected, and processed, so as to prevent the dust from polluting the external environment. Meanwhile, the dust suction pipe 14 is also provided with an electromagnetic valve 16, and the valve is opened when dust suction is needed for next treatment and is closed when dust suction is not needed, so that air flow in the box body is not leaked when the mesh belt sludge dryer normally operates.

On the other hand, the embodiment also provides a control method of the automatic ash removal device of the belt type sludge dryer, and the control method is to perform the following steps under the control of the control system:

s1, drying the sludge conveyed into the box body 1 by the mesh belt sludge conveyor 2;

s2, enabling dust-containing air flowing from the positive pressure cavity to the negative pressure cavity to pass through the automatic ash removal device, wherein in the process, the sensor continuously monitors the change of the filter mechanism, in the embodiment, the sensor is a strain gauge 12 and measures the change of the tensile stress of the filter bag 4 to the filter bag fixing component of the filter bag;

s3, when the change of the filtering mechanism reaches a set upper threshold value, starting the mechanical material shaking device 15 and the collecting mechanism, and enabling the dust collected in the filtering mechanism to fall to the collecting mechanism;

s4, stopping the mechanical material shaking device 15 and the collecting mechanism when the change of the filtering mechanism reaches a set lower threshold value;

steps S3, S4 continue to loop after said step S2.

Specifically, the change of the filter mechanism in the step S2 is a change of tensile stress, the upper threshold in the step S3 is a tensile stress increase of 20% to 50% relative to the initial value, and the lower threshold in the step S4 is a tensile stress increase of 2% to 5% relative to the initial value. Preferably, in this embodiment, the upper threshold in the step S3 is that the tensile stress is increased by 30% from the initial value, i.e., the tensile stress is 130% of the original tensile stress, and the lower threshold in the step S4 is that the tensile stress is increased by 3% from the initial value, i.e., the tensile stress is 103% of the original tensile stress.

Specifically, the collection mechanism includes two states of deployment and storage: when the change of the filter mechanism reaches a set upper threshold in the step S3, the collection mechanism changes from the storage state to the deployed state; when the change of the filter mechanism reaches the set lower threshold in step S4, the collection mechanism changes from the deployed state to the stored state. In this embodiment, the two states of the collecting mechanism are two states of the rotating slot cover 11 and the movable plate 9: in step S3, the collection mechanism changes from the storage state to the unfolding state, that is, the rotary chute cover 11 is opened, the movable plate 9 is turned down, and the outer edge of the movable plate at least exceeds the upper edge of the bag opening in the vertical direction; in the step S4, when the collecting mechanism changes from the unfolded state to the storage state, that is, the rotating slot cover 11 is closed, the movable plate 9 is turned up, and the outer edge of the movable plate does not exceed the lower edge of the bag opening in the vertical direction.

In addition, as shown in fig. 7, in this embodiment, before the mechanical shaker 15 is started in step S3, the vibration blanker below the fixed plate 8 in this embodiment may be started, after the mechanical shaker 15 is stopped in step S4, the vibration blanker below the fixed plate 8 in this embodiment may be stopped, and after the collecting mechanism is changed from the unfolded state to the storage state in step S4, the electromagnetic valve 16 may be opened, the suction device may be opened, after a certain period of suction, the suction device may be closed, and then the electromagnetic valve 16 may be closed.

In general, in this embodiment, the main structural member may be made of stainless steel with high corrosion resistance. All kinds of hinge structures can use the panel that thickness is suitable, and the preparation of preferred wear-resisting nylon material, necessary position can weld the strengthening rib, guarantees the straightness and the necessary intensity of face. The guide plate can be provided with a smooth coating which is not stuck with dust particles, and a Teflon baking coating or a nano coating is preferred.

As another embodiment, if the multi-section combination structure is characterized, the invention can be a module section when in use, the structural components, mechanical components and the like of each section are mutually independent, and the downstream of each section of dust suction pipe 14 can be communicated and gathered in the main pipe, and the dust-containing air is brought out of the dryer by the general suction device.

Example 2

As shown in fig. 8, the working sequence and process of the automatic ash removal device and each component in this embodiment are the same as those in embodiment 1, except that the operation duration of the mechanical material shaker 15 in the control method of this embodiment can be manually set in the control system, and the mechanical material shaker 15 is stopped without determining whether the tensile stress value measured by the strain gauge 12 reaches a certain lower threshold value through the control system.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the technical solutions of the present invention, and are not intended to limit the specific embodiments of the present invention. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention claims should be included in the protection scope of the present invention claims.

Claims

1. An automatic ash removal device of a belt type sludge dryer comprises a box body, a belt type sludge conveyor and a control system, wherein the belt type sludge conveyor is arranged inside the box body and is electrically connected with the control system, and an air return opening is formed in the side wall of the box body; the automatic dust removing device is electrically connected with the control system, is positioned above the mesh belt sludge conveyor and outside the air return port, and divides the box body into a negative pressure cavity and a positive pressure cavity; the automatic dust removing device comprises a filtering mechanism, a collecting mechanism, a mechanical material shaker and an inductor, wherein the collecting mechanism is positioned below the filtering mechanism and above the sludge conveyor, the mechanical material shaker is used for driving the filtering mechanism to vibrate, and the inductor is used for starting or stopping the mechanical material shaker;

the filtering mechanism comprises a plurality of filter bags and a filter bag fixing component; the filter bag is inclined upwards, the filter bag is provided with a bag opening and a bag bottom, and the bag bottom is connected with the mechanical material shaking device; the filter bag fixing assembly supports the bag opening, the inductor is mounted on the filter bag fixing assembly, and the filter bag fixing assembly is mounted on a vertex angle in the box body to divide the vertex angle area into the negative pressure cavity; the inclination direction of the filter bag is the direction of the bag bottom facing the top angle;

the filter bag fixing assembly comprises a vertical choke plate, a choke orifice plate and a filter bag supporting plate, the vertical choke plate is connected to the upper inner wall of the box body, the choke orifice plate obliquely supports the plane of the bag opening, the filter bag supporting plate is connected to the side wall of the box body, and the choke orifice plate is connected with the vertical choke plate and the filter bag supporting plate; the vertical choke plate comprises an upper transition plate, the filter bag supporting plate comprises a lower transition plate, and the choke orifice plate is supported between the upper transition plate and the lower transition plate; a metal plate structure is further arranged between the filter bag supporting plate and the side wall of the box body, the metal plate structure is hinged with the filter bag supporting plate, a connecting rod is further arranged between the metal plate structure and the filter bag supporting plate, one end of the connecting rod is connected with the filter bag supporting plate, and the other end of the connecting rod is connected with the metal plate structure or the side wall of the box body;

the inductor is a tensile stress strain gauge, and the strain gauge is arranged at the joint of the choke orifice plate and the upper transition plate and at the joint of the choke orifice plate and the lower transition plate.

2. The automatic ash removal device of a belt type sludge dryer as claimed in claim 1, wherein the filter bags are cone-shaped and arranged transversely, and the total transverse width of the filter bags and the gaps between the filter bags is smaller than the width of the collecting mechanism.

3. The automatic ash removal device of a belt type sludge dryer as claimed in any one of claims 1 to 2, wherein the collection mechanism comprises a material guide plate and a dust collection tank, and the dust collection tank is mounted below the material guide plate; the guide plate comprises a fixed plate and a movable plate, and the fixed plate is movably connected with the movable plate.

4. The automatic ash removal device of a belt type sludge dryer as claimed in claim 3, wherein the dust collection tank comprises a dust collection tank pipe and a rotary tank cover, the rotary tank cover is mounted on the dust collection tank pipe, and the dust collection tank pipe is connected with the fixing plate; the rotary slot cover is connected with the movable plate through a linkage mechanism, and the linkage mechanism enables the rotary slot cover and the movable plate to have two movable states: the first state is that the rotary slot cover is opened, the outer edge of the movable plate at least exceeds the upper edge of the bag opening in the vertical direction, the second state is that the rotary slot cover is closed, and the outer edge of the movable plate does not exceed the lower edge of the bag opening in the vertical direction; the lower end of the dust collecting groove pipe is also connected with a dust collecting pipe, and the dust collecting pipe is also provided with an electromagnetic valve.

5. The control method of the automatic ash cleaning device of the belt type sludge dryer as claimed in any one of claims 1 to 4, characterized in that the following steps are carried out under the control of the control system:

steps S3, S4 continue to loop after said step S2.

6. The method for controlling the automatic ash removal device of the belt sludge dryer according to claim 5, wherein the change of the filtering mechanism in the step S2 is a change of tensile stress, the upper threshold in the step S3 is a tensile stress increase of 20% to 50% relative to an initial value, and the lower threshold in the step S4 is a tensile stress increase of 2% to 5% relative to an initial value.

7. The control method of the automatic ash removal device of the belt type sludge dryer as claimed in claim 6, wherein the collection mechanism comprises two states of unfolding and accommodating: when the change of the filter mechanism reaches a set upper threshold in the step S3, the collection mechanism changes from the storage state to the deployed state; when the change of the filter mechanism reaches the set lower threshold in step S4, the collection mechanism changes from the deployed state to the stored state.